EP3224169B1 - Sheet-processing machine having a deliverer, and method for depositing sheets - Google Patents

Description

The invention relates to a sheet processing machine with a delivery and with a sheet conveying system for conveying sheets on a delivery pile and a method for depositing sheets.

In the DE 10 2006 040 679 A1 a method and an apparatus for depositing sheets of a sheet-processing machine are described on a sheet stack, the sheets are transported by the endless circulating sheet conveying system successively on the sheet stack and with the sheet leading edge against leading edge stops. In order to be able to realize an exact stack formation, the sheet stacks are provided with stop surfaces in the upper area in the form of such displays, to which a reciprocating movement directed transversely to the sheet transport direction is impressed, whereby the sheets are aligned with respect to their side edge. The position of the side edges of the arc fed from the sheet conveying system to the sheet stack with respect to the abutment surfaces is detected by also provided laterally ultrasonic sensors. In case of deviations of the actual position of the target position adjusting elements are activated to correct the sheet position or the sheet promotion is interrupted.

The disadvantage is that only in case of deviations of the actual position of the desired position with respect to the side edge position, a correction or interruption of the sheet feed takes place. This means, however, that only so-called oblique bends with respect to the side edge stops and not also overshoot arch or oblique arc with respect to the leading edge stops are detectable. Overshoot arch or oblique arch with respect to the leading edge stops are guided over them by the gripper systems or the sheet brake system which decelerates the sheets and promotes against the leading edge stops. Be such Sheet entrained by subsequent gripper systems of the sheet conveying system, this can lead to a breakdown of the sheet-processing machine.

The measure that the sheet feed is interrupted in case of deviations of the position of the side edges of a desired position, reduces the effectiveness of the sheet processing machine in that all sheets are in the machine waste paper. In addition, it is disadvantageous that the sheets located in the machine must be removed time consuming.

From the DE 101 06 669 A1 a device for storing sheets is known, are arranged in the measuring devices in the leading edge stops. In a first embodiment, the measuring device is designed as a touch sensor, which can detect the Bogenankunftshöhe and further the contact intensity. In a second embodiment, the measuring device is designed as a receiver of a light beam emitted by a light source. A connected control and regulating device changes the timing of the gripper opening and / or the speed (peripheral speed) of the suction roller and / or the suction force of the suction roller and / or the blowing intensity of the fan. A disadvantage of this solution is that no crooked or overshoot bow can be detected.

From the DE 198 19 688 A1 a device for protecting the gripper systems is known in which a mechanical Überießbogenkontrolle is provided. The overshoot arch control contains feeler links that are pivoted about a frame point in an overshoot arc. By swiveling the feeler links, the machine receives the signal "Emergency stop". A disadvantage of this solution is that the mechanical scanning of overspill is prone to errors, since the sensing elements cause a safe distance to the gripper carriage track. If an overshoot is not detected, the machine may be damaged at high speeds. Another disadvantage is that no crooked sheets are detected as such.

From the DE 10 2004 021 808 A1 a Überschussbogensicherung in a sheet delivery is known, which has mechanically displaceable by Überießbogen levers. The movement of the levers is sensor-monitored, so that when a detected over-shoot, the sheet-processing machine can be switched off. A disadvantage of this solution is that the mechanical scanning of overspill is prone to errors, since the levers require a safe distance to the gripper carriage track. If an overshoot arc is not detected, the machine may be damaged at high speeds. Another disadvantage is that no obliquity can be detected as such.

From the EP 1 842 817 A2 a device for detecting irregular sheet design is known, wherein the boom has a first and a second sheet stack downstream therefrom. The front edge stops of the first sheet stack is assigned a non-contact sensor that detects an irregular sheet transport and stops the sheet processing machine. This is wasteful, which must be removed from the machine time-consuming, with the individual sensor detects only very far overshoot, while oblique sheets can not be detected as such.

The invention has for its object to provide a display of a sheet-processing machine. In particular, the display is designed so that accidents can be excluded by faulty filed sheets and the effectiveness of the machine is increased.

According to the invention the object is achieved by a device having the features of the independent device claim or by a method having the features of the independent method claim. Advantageous embodiments will become apparent from the dependent claims, the description and the drawings. At this point All embodiments of the invention disclosed in the claims of the originally filed documents are explicitly included in the description.

In one embodiment, a display (also referred to as cantilever) is provided for a sheet processing machine with a sheet to an output stack and with a sheet leading edge of the sheets on at least two leading edge stops conveying sheet conveying system, wherein the at least two leading edge stops span a leading edge stop plane, wherein at least a further stop for aligning the delivery stack is provided at a further edge of the delivery stack and wherein at least one detection unit is designed to monitor at least one point downstream of the leading edge stop plane in the sheet transport direction. In this case, at least one of the leading edge stop plane is monitored in the sheet transport direction upstream point. At least one sensor is preferably designed to monitor the at least one point. Particularly preferably, the at least one sensor for monitoring the at least one point, in particular the position of at least one arc with respect to the further stop, precedes the front edge stop plane spanned by the leading edge stops in the sheet transport direction. The sensor can be designed as desired and is preferably a non-contact sensor. The sensor may be associated with the stack side, such as a side edge stop, and / or the stack trailing edge, such as a trailing edge stop.

Preferably, at least two further stops for aligning the delivery stack are provided in the delivery at two further edges of the delivery stack. If a plurality of sensors are used to monitor the further stops, these are preferably also arranged in front of the leading edge stop plane in the sheet transport direction. Particularly preferred is at least two side-edge sensors for monitoring the side edge stops of the leading edge stop plane in FIG Preceded by the sheet transport direction. Each side edge stop can be assigned a separate side edge sensor. These, in particular, non-contact side-edge sensors are preferably designed as optical sensors or as ultrasound sensors. Further forming, the stack trailing edge may be associated with a further edge sensor. This further back edge sensor preferably also operates without contact and can be embodied as an ultrasound sensor or optical sensor, for example as a laser beam sensor. Particularly preferred rear edge sensors axially adjustable z. B. may be formed with a braking station to monitor the sheet trailing edges, in particular their falling motion in the lateral area.

The sensors associated with the side edge stops and / or the stack trailing edge can in particular monitor whether a sheet is deposited on one or both side edge stops. For signal evaluation, the sensors are connected to a control device. If a false-sheet projects in the horizontal direction beyond a vertical stop surface of at least one lateral and / or trailing-edge stop, then a signal is generated by the control device, which can be integrated in or part of the machine control, by means of which a machine function can be initiated. A machine function can be the setting of the sheet transport, in particular an emergency stop, be and / or it can be controlled or controlled adjusting elements for the position and / or orientation of the sheet so that the protruding false sheet falls on the stack and not trailing bow be placed more on the stop. By monitoring the side edge stops and / or trailing edge stops the risk of damage to a sheet or the transport devices is reduced.

The monitoring of the sheet transport can take place in such a way that the at least one sensor registers a departure from a proper transport or fall distance, possibly taking into account tolerances, and / or that a steady, proper one Transport or proper filing is registered. The associated control device accordingly initiates a machine function when the sensor detects that it is leaving the predetermined transport path and / or no properly transported sheet is being registered. Leaving the predetermined transport path can be detected, for example, by means of the at least one sensor by checking whether during a conveying cycle no gripper carriage is detected, because a gripper carriage is hidden by an incorrectly lying arc in the detection direction of the sensor. Further, the sensor could be aimed directly at the misaligned arc.

In a further development, it is provided to arrange the side edge stops arranged laterally of the delivery stack as a straight-line jumper toward and away from the stack. Here, when placing a sheet on the or the Geradstoßern be provided to design a machine function such that then the respective Geradstoßer or both Geradstoßer is accelerated deviating from the periodic movement in the lateral direction or so that as a result of the inertia of the bow this from the or both Geradstoßern slides and falls on the pile. The sweeping lateral movement of the or the joggers provides the sheet sufficient space for sinking onto the stack surface. Alternatively or additionally, in the case of a resting sheet on one or both Geradstoßern still a slide, a blowing and / or Saugluftvorrichtung and / or another conveyor are actuated, so that the sheet in question is returned to the allowable stacking area. Developing a sheet brake is arranged in the delivery, which delays the sheets to be deposited from machine speed to storage speed. As can be triggered by the control device machine function, it may be provided to operate individual brake elements of different braking stations such that a following sheet is stored properly. In this case, the braking effect over the sheet width can be adjusted specifically to a change in position, in particular a twisting of the or the subsequent sheet to achieve the desired stacking area. The machine functions to be triggered by the control device can also be selected depending on the printing material or depending on other parameters.

In a delivery of a sheet-processing machine, in the arc to a delivery stack and with a sheet leading edge of the sheet on at least two leading edge stops transporting sheet conveying system of a front edge stop plane spanned by at least two leading edge stops plane sensors for side edge stops are particularly preferably designed such that it determines the location of Monitor side edge of each sheet with respect to the stop surface, and that a signal is issued when the side edge is behind the stop surface of a side edge stop. The side edge stop sensors for the position of the sheet side edge with respect to the stop surface are preferably connected to the control device for evaluating the sensor signals and for performing machine functions. When the signal is output, the control device preferably effects the setting of the sheet transport and / or the activation of one or more actuators in such a way that the sheet lying above a stop sinks onto the stack surface. For an exact measurement of the sheet position, the side edge stop sensors may be arranged and configured such that these transmit measurement signals in a region of the stop adjacent to the stop surface, and that the position of the side edge monitored by means of a measurement of a signal delay between a sensor and the respective arc becomes. The measurement signals can be emitted, for example, against the underside of a sheet lying behind the stop surface sheet.

According to one embodiment, a respective side edge stop has an overlying edge, and a sensor associated with the side edge stop is directed to an area in the vicinity adjacent to the edge. In this case, the sensor, the inner edge and / or the outer edge of the side edge stop monitor. If an ultrasonic distance sensor is provided as the side edge stop sensor, then its detection range is preferably arranged outside a path of the gripper carriages circulating for transporting the sheets. The side edge stop sensor may be fixed to the side edge stop in such a way that they can be adjusted in common, for example, for sheet format adjustment in or against the sheet transport direction and / or transversely to the sheet transport direction.

Preferably, in one embodiment, a delivery of a sheet-processing machine is provided with a sheet to a delivery stack and with a sheet leading edge of the sheet on at least two leading edge stops transporting sheet conveying system, wherein at least one the position of the sheet contactless monitoring detection unit is provided and wherein the at least one detection unit for Monitoring is formed at least one point downstream in the sheet transport direction of a spanned by the at least two leading edge stops front edge stop plane, wherein the at least one monitored point is preferably within a range extending from the leading edge stop plane beginning to 100 mm in the sheet transport direction. In another embodiment, the monitored point is off-center, d. H. the monitored point is spaced across the machine width from the machine center.

In one embodiment, a delivery of a sheet processing machine includes a sheet delivery system that conveys the sheets to an output stack and to the sheet leading edge at leading edge stops. The sheet conveying system preferably includes gripper systems arranged on traction means, which are conveyed by guide means guided along an orbit. Of the gripper systems, the sheets are brought to a delivery stack arranged in the delivery and released there. The released bows are aligned with the leading edge on the leading edge stops and are thereby aligned. The aligned Sheets are deposited on the delivery pile. It is a the position of the sheet leading edge contact-free monitoring detection unit provided, which is designed to monitor at least one point, which is downstream in the sheet transport direction of a front edge stop plane spanned by the leading edge stops. Non-contact monitoring is preferably to be understood as continuous non-contact monitoring without mechanical contact with the sheet. The delivery is preferably designed as a single-stack delivery, ie only a single delivery stack is formed in the delivery. Accordingly, only one Stapelhubvorrichtung is provided in this display.

The leading edge stop plane is clamped by at least two front edge stops, which are preferably arranged in a straight line at least in a linear manner, on the front side of the delivery stack. Preferably, however, the leading edge abutments each have leading edge abutment surfaces that span the leading edge abutment plane. The detection unit is arranged such that the point monitored by it lies within a range which extends from the leading edge stop plane beginning to 100 mm in the sheet transport direction. The sheet transport direction is preferably the normal vector to the front edge stop plane spanned by the leading edge stops. The leading edge stop plane here is a space plane. The spatial plane is particularly preferably unbent. As a rule, the leading edge stop plane is vertical, but may also include an angle with the vertical. Advantageously, by monitoring the point in said region, a detection of obliquity can be made. The monitored point is preferably an area of minimum extent, but may also be a geometric area or a surveillance area.

In a further development, the monitored point is arranged at a distance from the front edge stop plane. In a further development of the monitored point is within an area which is 1 mm after the leading edge stop level beginning to 50 mm extends in the sheet transport direction. In a particularly preferred development, the monitored point is within an area which extends 2 mm after the leading edge stop plane beginning to 10 mm in the sheet transport direction. This also ensures the detection of minimal obliquity over the leading edge stops. Any machine functions can be triggered with a detected obliquity.

In a further embodiment, the detection unit is designed to monitor at least two points which are at a distance from one another transversely to the sheet transport direction, that is to say over the machine width. Preferably, these two points are equally spaced from the leading edge stop plane. Thus, these are also arranged in the leading edge stops in the sheet transport direction immediately adjacent area. Further, these are at least two points within a minimal sheet format to be processed with the delivery. The machine is designed to process a range of different sheet formats whose upper limit is formed by the maximum sheet size and the lower limit by the minimum sheet size. The technical implementation of the possibility of processing various sheet formats is realized by the formation of means for format adjustment. The machine preferably has format adjustment means such as adjustable sheet guiding elements, stop elements, gripper elements or an activability of subsystems. Particularly preferably, the arrangement of the points to be monitored takes place symmetrically to the machine center, as far as the minimum to be processed sheet format is aligned symmetrically to the machine center. Alternatively, it is possible to move the minimum sheet size to one of the two sides or to put it on a side edge of the machine. In such case, the points to be monitored by the detection unit can be arranged analogously in the minimal sheet format. A shift of a point to be monitored can further z. B. by an adjustment of a sensor, a change of position of the sensor or a deflection of a sensor beam done.

For example, in a medium format press, the minimum working width may be about 45% of the maximum working width to be processed.

Preferably, in the case of a plurality of points to be monitored by the detection unit or the detection units, a differentiated evaluation of the signals obtained is preferably carried out in conjunction with an evaluation unit. In the differentiated evaluation, it is preferable to make a minimal distinction as to whether there is an overshoot arc with respect to the leading edge stops or only a crooked arc with respect to the leading edge stops which lies only partially over the leading edge stops. Correspondingly suitable machine functions are therefore initiated. The machine functions may differ according to the differentiated evaluation of the signals.

In a further development, it is provided to monitor further points by the detection unit or the detection units. As further points, preferably points outside the minimum sheet format are selected. Points are selected in a larger sheet format, in particular at the outer sheet edges of the maximum sheet format, which are preferably evenly spaced from the leading edge stop plane. Most preferably, the other points are arranged approximately as far in the sheet transport direction away from the leading edge stop plane as the arranged in the minimum sheet format points. Thus, all, preferably four, points are also arranged in the area directly adjacent to the leading edge stops in the sheet transport direction. The further points are preferably also in the same horizontal plane as the points set to the minimum sheet format. By so arranged points a detection of the oblique sheets is ensured in the minimum sheet format and advantageously increases the error security in the detection of bow shifts in the maximum sheet size. Alternatively or additionally, scanning sensors arranged in the minimal sheet format can also be designed to be adjustable and / or movable. In particular, one Movability of the scanning sensors transversely to the sheet transport direction can allow adjustment to the current sheet size. The other points lying outside the minimum sheet format can also be monitored by adjustable or movable scanning sensors. The scanning sensors may include, for example, sensors / receivers.

In a further development, the detection unit monitors at least two points which are spaced one behind the other in the sheet transport direction. Accordingly, these points are preferably at different distances from the front edge stop plane, wherein at least the first point in the sheet transport direction is within a range from the front edge stop plane to 100 mm in the sheet transport direction. The monitoring of the at least two points can be done by a single detection unit or by multiple detection units. The monitored points are preferably evaluated independently of one another by an evaluation unit connected to the at least one detection unit or can be evaluated differently with respect to one another. Particularly preferably, an evaluation of the two successive lying in the sheet transport direction points independently of each other, such that when a detected overshoot a machine function is triggered, which is independent of the evaluation of the other point. In particular, an emergency stop is initiated when a safety-relevant overshoot arc is detected in the point downstream in the sheet transport direction.

In a preferred embodiment, the monitoring of the at least one point by the detection unit by means of a sensor beam generated by the detection unit. The detection unit has for this purpose a sensor / receiver, wherein the sensor for generating the sensor beam and the receiver for receiving this beam are set up. Sensor / receiver can be arranged on opposite sides of the rotating gripper systems or even be arranged above or below the rotating gripper systems and cooperate with an opposite reflector. It is preferably provided to equip the detection unit with a sensor / receiver and a reflector, wherein the reflector is arranged on the side opposite the sensor / receiver side of the rotating gripper systems. Particularly preferably, the reflector is associated with the leading edge stops, whereby a compressed construction can be achieved. The reflector can be arranged at least partially between two leading edge stops. Particular preference is given to using optical sensors such as photosensors, for example lasers. However, ultrasonic sensors or other suitable sensors can also be used.

Developing this, the reflector is associated with a frame-fixed recording, wherein the reflector can also be integrated in the surface of the recording. On the recording and other machine elements, such as sample sheet fingers can be arranged. The sensor / receiver of the detection unit is advantageously arranged on a holder within a deflection region of the sheet conveying system. In particular, the holder is designed as a traverse arranged over the machine width, which has an opening for the sensor / receiver. The traverse can be connected independently or with a blow frame. As a holder but also the blow frame itself can be used. The sensor beam monitors the area between transmitter / receiver and in the version with a reflector between the transmitter / receiver and the reflector. The sensor beam is preferably formed at least approximately parallel to the leading edge stop plane and most preferably at least approximately perpendicular.

In a further development, it is provided to carry out the monitoring of the at least one point also during a test sheet removal and / or a stack change. Particularly advantageous is a permanent monitoring of at least one point, with only passing gripper systems are hidden. It can be provided to filter or hide an error signal caused by the gripper systems. Preferably, the suppression of the gripper systems takes place under consideration of tolerances. As tolerances, for example, 5 ° to 10 ° relative to a machine angle can be provided before and after a gripper system. Particularly preferably, an uninterrupted monitoring is carried out in each case between two directly successive gripper systems.

In a further development, it is provided to assign a cleaning unit to the sensor / receiver and / or the reflector of the detection unit. The cleaning unit preferably operates pneumatically to clean the sensor / receiver unit and / or the reflector. The cleaning by the cleaning unit is preferably carried out as needed or at intervals as instructed by the printer or automated.

In another embodiment, a delivery of a sheet processing machine includes a sheet delivery system conveying the sheets to a delivery stack and the sheet leading edge to leading edge stops. The sheet conveying system preferably includes gripper systems arranged on traction means, which are conveyed by guide means guided along an orbit. Of the gripper systems, the sheets are brought to a delivery stack arranged in the delivery and released there. The released bows are aligned with the leading edge on the leading edge stops and are thereby aligned. The aligned sheets lay down on the delivery pile. It is a the position of the sheet leading edge monitoring detection unit provided, which is designed to monitor at least one point. The detection unit is in this case designed to detect the angular position of the sheet leading edge with respect to the leading edge stops or for detecting the presence of a sheet at at least two spaced-apart points and with respect to the spaced points differentiating monitoring.

The position of the sheet leading edge preferably means the presence or absence of a sheet area at a defined time or the qualitative angular position of the sheet leading edge preferably in relation to a reference point or a reference line o. Ä., Or the quantitative angular position of the sheet leading edge. Preferably, angular position is understood to mean the position of the respective sheet leading edge relative to the front edge stop plane spanned by the leading edge stops. The angular position of the sheet leading edge is preferably considered in a horizontal plane, particularly preferably at the level of the stack surface. The angular position can preferably be expressed in terms of the number of degrees.

A differentiated monitoring of two spaced apart points means that a minimal distinction can be made between an overshoot arc, which lies with its entire leading edge over the leading edge stops, and a skewed bow, which lies only partially over the leading edge stops. As a result, it can be determined with certainty whether overspill sheets or oblique sheets are fed to the delivery stack. This makes it possible to correct the position of these sheets during the machine run or to empty the sheet-processing machine and subsequently to make a correction. As a result, the accumulated waste and machine downtime can be reduced and thus the efficiency of the sheet-processing machine can be increased.

Further, it is provided to monitor with the detection unit at least two longitudinally and / or transversely to a sheet transport direction spaced from each other arranged points. In this case, the two spaced-apart points are preferably transversely to a sheet transport direction within a characteristic for the sheet-processing machine minimal sheet format. Particularly preferably, the detection unit for monitoring the at least one point within a range from the leading edge stop plane, starting in the sheet transport direction to 100 mm, is followed by a further detection unit. The Further detection unit is preferably assigned to a deflection stack of the sheet conveying system assigned to the delivery stack. In particular, the further detection unit is arranged to monitor an area after the reversal point of gripper systems of the sheet conveying system. Preferably, the area monitored by the further detection unit is arranged at an angle of 0 ° to 90 °, more preferably between 60 ° and 80 ° to the horizontal. With the further detection unit, at least one further point is preferably monitored. The further point is particularly preferably spaced at least 200 mm from the monitored point located in the region of the leading edge stops. By the detection unit or the detection units, the position and / or presence of a sheet is preferably monitored without contact. Particularly preferably, the position and / or presence of the sheet is detected in the sheet transport direction after the leading edge stops by the detection unit or the detection units. In order to detect the erroneously filed sheets, the detection unit or the detection units can have scanning sensors, for example with sensors / receivers. In a further development, each of the scanning sensors interacts with a cleaning unit.

In a further development, the detection unit or the detection units distinguishes between an overshoot sheet with respect to the leading edge stops and a skewed sheet with respect to the leading edge stops, wherein different machine functions can preferably be initiated or triggered depending on the evaluation. In the case of a detected obliquity bend, it is possible, for example, to actuate an operating unit, empty the machine or even initiate an emergency stop. A Leedrucken the machine is preferably carried out depending on the sheet material, in particular a printing material, preferably in dependence on the basis weight, so that the necessary security is guaranteed. In the machine located thin substrates can be partially or completely printed, for example, while thicker substrates such. B. cardboard z. B. with a Area weight greater than 150g / m ² require an emergency stop. Further development can be done by the operating unit and an indication of the oblique arch, in particular in relation to the leading edge stops. Further education can be changed by the machine function a delivery setting and / or the operating unit to issue a printer instruction. The printer instruction may then be supplied to or confirmed by an operator.

In addition, however, it is also possible to evaluate which region of a slant arc lies above the leading edge stops. In a further development, the concrete tilt of the obliquity bend can also be recorded in terms of the number of degrees. This can be done in particular to a straight line formed by at least two leading edge stops. Preferably, the straight line is formed by the leading edge abutment surfaces of the leading edge stops at the level of the stacking surface or at the upper edge of the leading edge stops facing the gripper carriage. The position of the sheet can be displayed accordingly or corrected by setting suggestions or setting changes.

In one embodiment, the detection unit can monitor the presence of an arc at defined times, preferably in a defined machine state, in particular at a defined machine angle in at least two points, these points lying in a first variant transversely to the sheet transport direction and in another variant along the sheet transport direction. In a further variant, points can be monitored both transversely and along the sheet transport direction. The detection unit can have a plurality of scanning sensors, in particular for monitoring the at least two points. Particularly preferably, the monitoring of the transverse to the sheet transport direction points by a first detection unit and the subsequent in the sheet transport direction further point is carried out by a further detection unit. Most preferably, the monitoring of the Points lying transversely to the sheet transport direction from the first detection unit via a plurality of scanning sensors and the subsequent point by the further detection unit by means of a further scanning sensor. The scanning sensors may for example comprise sensors / receivers. Alternatively, these points can be monitored in all variants of at least one detection unit, for example via a camera.

The assignment of a further detection unit in a wider area, in particular in a reversal area of the bow conveyor on the delivery stack conveying sheet conveying system allows control of the conveyor system associated gripper systems on entrained bow and thus excludes an accident of the sheet processing machine. Due to the spacing of the further detection unit from the leading edge stops, a safety-relevant overshoot arc can be reliably deduced when the overshoot sheet is detected, with detected pieces of paper also being classified as safety-relevant overshoot sheets. An emergency stop of the machine is preferably carried out in the case of a signal generated by the further detection unit. In this case, the emergency stop is particularly preferably independent of the signal evaluation of the upstream detection unit. Particularly advantageously, the further detection unit increases the security for the printer that no sheet was conveyed back to the machine even in a crooked or overflow sheet detected by the upstream registration unit. Previously necessary complex searches for non-existent safety-relevant sheet in the display are reduced or avoided.

The at least one detection unit detects in another embodiment, the angular position of the sheet leading edge with respect to the leading edge stops. Here, the angular position of the sheet leading edge of the deposited sheet can be monitored before the leading edge stops, at least partially over the leading edge stops and / or after the leading edge stops. The registration unit can have a camera, in particular a CCD camera, as a sensor. By the detection unit is influenced in accordance with the detected misplacement of the bow of the filing process and / or appropriate information is provided. The angular position can be detected, for example, in terms of the number of degrees or as the distance to a stop in a unit of length, preferably in millimeters.

A defined hiding of the gripper carriage during the passage of the detection unit or the detection units takes place via a mechanism and / or a software. The suppression preferably takes place by means of angle values determined on a sprocket main shaft. While a gripper carriage passes through the Ausblendbereich a generated by the detection unit signal is therefore not evaluated as skew or overshoot. The detection unit or the detection units monitor the sheet particularly advantageously completely contactless.

Since a Schiefbogen lies only partially above the leading edge stops, he is partially still held by at least one leading edge stop, so that in a Schiefbogen can not be closed directly to a security-related event. As a result of the evaluation of the detection unit, either an emergency stop can be initiated as the safest variant when the oblique arc is detected. Alternatively, however, in a further variant, after the determination of a slant arc, all the sheets present in the machine can be deposited at a continuous printing speed. This advantageously results in a significantly reduced expenditure of time, as compared to an emergency stop not conveyed out in the machine bow out, in particular herausgetippt must be. In this case, a distinction according to the type of bow used is provided for the purpose of avoiding accidents. In particular, z. B. at a basis weight above 150 g / m ^2, a first machine function and below this basis weight another machine function can be initiated. In a printing machine, for the purpose of avoiding accidents, a distinction can be made according to the type of substrate used, for example of Cardboard and paper, be provided. In carton processing, z. B. at a basis weight greater than 150 g / m ² , therefore, an emergency stop is initiated by the machine control after detected inclined sheet according to the first variant and in paper processing, for. B. at a basis weight less than 150 g / m ² , a blank printing of the machine according to the second variant carried out.

In a further alternative variant, the machine is not stopped, but special mechanisms ensure stapelgerechte position correction of the bow. This can be done by instructions to the printer, by suggesting changes to settings, automatic settings changes or actuator activation. For a Aktoransteuerung all the sheet storage active or passive influencing actuators come into consideration, such as the movement of the front and / or side edge stops, the fan setting, the setting of individual or all brake elements, etc. or the Stapelhubvorrichtung. The action of the printer is improved by displaying the skew and / or printer instructions. The printer can thus receive information to improve the sheet deposition by hand or by changing the delivery setting. In a further development, it is provided to select the intended function, in particular the machine function, as a function of the printing material used, the side of the imbalance, the degree of skew and / or other boundary conditions.

Fig. 1:

die schematische Darstellung einer Auslage in Seitenansicht;

Fig. 2:

eine Draufsicht des Auslagestapels mit ordnungsgemäß abgelegten Bogen;

Fig. 3:

eine Draufsicht des Auslagestapels mit über einem Seitenkantenanschlag liegenden Falschbogen;

Fig. 4:

die ausschnittsweise Darstellung eines Greiferwagens mit einem Vorderkantenanschlag;

Fig. 5:

eine Draufsicht des Auslagestapels mit Schiefbogen;

Fig. 6:

das Prinzip einer Reinigungseinheit in Seitenansicht;

Fig. 7:

eine Weiterbildung der Auslage in Seitenansicht;

Fig. 8:

Draufsicht auf die Gitterstruktur mit integrierten Reflektoren;

Fig. 9:

perspektivische Ansicht eines Ausschnittes der Auslage mit Gitterstruktur;

Fig. 10:

Weiterbildung der Auslage mit in der Traverse integrierter Reinigungseinheit;

Fig. 11:

Ausschnitt der Draufsicht des Auslagestapels;

Fig. 12:

Auslagestapel in Bogentransportrichtung gesehen mit sensorüberwachten Seitengeradstoßern;

Fig. 13:

Draufsicht auf einen Auslagestapel mit Hinterkantensensoren;

Fig. 14:

Seitenansicht eines der Bremsstation zugeordneten Hinterkantensensors;

Fig. 15:

Seitenansicht eines der Bremsstation zugeordneten Hinterkantensensors in Kombination mit einem Stapellückensensor;

Fig. 16:

Stapelgrundriss mit möglichen Überwachungsbereichen.

In the following, the invention will be explained by way of example. The accompanying drawings show:

Fig. 1:

the schematic representation of a delivery in side view;

Fig. 2:

a top view of the delivery stack with properly filed bow;

3:

a plan view of the delivery stack with lying over a side edge stop false bows;

4:

the fragmentary representation of a gripper carriage with a leading edge stopper;

Fig. 5:

a top view of the delivery stack with Schiefbogen;

Fig. 6:

the principle of a cleaning unit in side view;

Fig. 7:

a development of the delivery in side view;

Fig. 8:

Top view of the grid structure with integrated reflectors;

Fig. 9:

perspective view of a section of the display with grid structure;

Fig. 10:

Development of the display with integrated in the Traverse cleaning unit;

Fig. 11:

Detail of the top view of the delivery pile;

Fig. 12:

Delivery stack seen in the sheet transport direction with sensor-monitored Seitengeradstoßern;

Fig. 13:

Top view of a delivery stack with Hinterkantensensoren;

Fig. 14:

Side view of the brake station associated rear edge sensor;

Fig. 15:

Side view of a brake station associated with the rear edge sensor in combination with a stacking distance sensor;

Fig. 16:

Stack floor plan with possible surveillance areas.

In Fig. 1 is a display of a sheet-processing machine, here in particular a sheet-fed press, especially a sheet-fed rotary printing machine preferably in aggregate and series construction, shown. The machine is operated in accordance with the offset method, although other printing methods such. B. screen printing can be integrated in the machine. In the works of the machine, the sheets 7 are gripped by gripper systems of rotating cylinders at the front edge and transferred between the cylinders in the gripper closure. In the printing units, the sheet 7 in a colored printing gap formed by a cylinder and a rubber cylinder, each with an ink suitably. Further, one or more coating units can be provided, in which the sheet 7 can be painted by a paint form cylinder. The cylinders arranged in the machine can be made single or multi-sized, whereby a single-sized cylinder can accommodate at least one sheet 7 of maximum format circumferentially. Preferably, the cylinders are made double size. The machine may also include a turning device for turning the sheets 7 in a perfecting mode during machine running. Next can also processing facilities or processing plants, such. B. cold foil works, be integrated in the machine.

From the sheet-fed printing machine, a last here double-sized impression cylinder 1 is shown schematically. From the delivery a drive sprocket 2 and a Umlenkkettenrad 3 are shown. The sprockets 2 and 3 are each connected to a shaft 4, 5 on which coaxially spaced another drive sprocket 2 and a Umlenkkettenrad 3 are arranged. About the sprockets 2, 3 is in each case an endless chain 6, which forms a chain circle, out. Between the two chain circles, the bow 7 holding gripper carriage 8 are arranged at a constant distance from each other. The sprockets 2, 3 and this wrap around chains 6 together with the gripper carriage 8 a sheet conveying system, which may also consist of other elements. In particular, the deflection of the gripper carriage 8 instead of by the Umlenkkettenräder 3 also take place by deflection guides. The circumferentially guided gripper carriage 8 have gripper systems for taking over the sheet 7 at the front edge of the printing cylinder 1.

For a secure transport of the held by the gripper carriage sheet 7 7 a sheet guiding device and for quality assurance of processed in the sheet-fed rotary printing machine sheet 7, for example, a dryer 19 and / or a dusting unit 20 are provided in the delivery. The sheet guiding device can be a Gripper carriage 8 facing sheet guide plate 18 which is provided with Blasluftdüsen and extends over the machine width. Under the sheet guide plate 18 blow boxes are preferably arranged, via which the Blasluftdüsen be supplied with blowing air, so that between the sheet guide plate 18 and transported by the gripper carriage 8 sheet 7 in particular for perfecting a Tragluftpolster can be formed. In order to avoid sticking of the sheet 7 on the delivery stack 9, above the sheet guiding device, in particular above the sheet guide plate 18, dryer 19 and the sheet 7 powdery dusting unit 20 are provided, and it is also possible to heat the sheet guide plate 18 in the area to control or regulate the dryer 19 to integrate a coolant circuit.

From the display is still a delivery stack 9, which is supported by a stacking plate 10, shown. The stacking plate 10 is an unillustrated hoist, which acts by means of lifting chains 11 on the stacking plate 10 assigned. Furthermore, from the display front edge stops 12, a brake unit 13 and trailing edge stops 14 are shown. The leading edge stops 12 and the trailing edge stops 14 are spaced apart from each other on an axis transverse to a sheet transport direction 39 (e.g. Fig. 2 . 3 or 5 ). The brake unit 13 may, for. B. a transversely to the sheet transport direction 39 extending suction roll or, as shown in the embodiment, circumferentially, spaced from each other arranged braking elements, such as suction rings or suction belts 13.1, have. Alternatively, the brake unit 13 may also include Nachgreifer.

The Fig. 2 shows a plan view of the delivery stack 9 with properly deposited on the leading edge stops 12 sheet 7, which form the delivery stack 9. The leading edge stops 12 are here shown preferably arranged symmetrically to a machine center 38. The brake unit 13 contains here, for example, four arranged transversely to the sheet transport direction 39 with suction belts 13.1 stocked braking stations, each suction belt 13.1 to be deposited sheet 7 with a braking force applied. The side edges of the sheet 7 are parallel to the sheet transport direction 39. The delivery stack 9 is assigned at least one further stop 16, 14 for aligning the delivery stack 9 at a further edge of the delivery stack 9. The side edges of the sheet 7 are here preferably aligned by a respective side edge stop 16. The side edge stops 16 are executed here in one piece, but can also be designed in several parts. The side edge stops 16 may extend over the entire arc length or only over portions of the arc length. Further, the side edge stops 16 can be adjusted for format setting, for example together with the brake unit 13. In a further development, it is provided that the side edge stops 16 are designed as side straight pushers 16 which can be moved transversely to the sheet transport direction 39. The Seitengeradstoßer 16 may each have a stop plate, a longitudinal guide and a linear drive. With proper sheet storage of the sheet 7 is located centrally to the stop plates of the Seitengeradstoßer 16. Further education are also provided on the trailing edge of the delivery stack 9, for example below the brake unit 13 in particular movably mounted trailing edge stops 14.

The side edge stops 16 are associated with at least one sensor 17, 15 for monitoring the sheet position with respect to the side edge stops 16. In this case, the sensor 17, 15 monitor both side edge stops 16 or it is associated with each side edge stop 16, a side edge sensor 17. The sensor or sensors 17, 15 may be spaced apart or arranged in the vicinity of the side edge stops 16. The sensor or sensors 17, 15 can also be arranged on the trailing edge, preferably in the lateral area. In the illustrated embodiment, each side edge stop 16 is associated with a side edge sensor 17 adjacent. The side edge sensors 17 can be assigned to the side stops 16 fixed. In a preferred embodiment, the side of the stop plates of the Side edge stops 16 arranged side edge sensors 17 are formed as ultrasonic distance sensors, each emit a measuring beam in the vertical direction on the underside of the sheet. Alternatively or additionally, however, the side edge sensors 17 can also monitor the area of the stack floor plan 9.1 and in each case detect the sheets 7 which drop correctly. The side edge sensors 17 are in signal communication with a control device. Further education are also the drives of Seitengeradstoßer 16 with this control device, which may be part of the machine control or may be integrated in the machine control, in conjunction.

The Fig. 3 shows an improperly stored so-called. False sheet 7.1, which has at least partially deposited on a stop plate of a side edge stop 16. In this position, the measuring beam of the side edge sensor 17 strikes the underside of the false-arc 7.1 lying above the stop plate. According to the transit time principle, the side-edge sensor 17 designed as an ultrasonic distance sensor can generate a signal which informs the control device that a false-arc 7.1 lies over a stop plate of a side edge stop 16. Further development, the control device can determine by evaluation of both side edge sensors 17, on which the side edge stops 16 or Seitengeradstoßer 16 of the false sheet 7.1 is stored. The detection depth of the ultrasonic distance sensor is preferably to be dimensioned such that no false-arc 7.1 is signaled when a gripper carriage 8 passes. The control device preferably processes a machine angle transmitted by a rotary encoder during the initiation of a machine function.

Preferably, a machine stop, in particular a quick stop, is initiated by the control device as a machine function when a false-sheet 7.1 is detected. The machine function can be dependent on the printing material. For example, a machine stop may be initiated when paperboard sheets are being processed and another machine function when no paperboard sheet is being processed. It is further education provided to drive the or the Seitengeradstoßer 16 such that the false sheet 7.1 falls from the one or more stop plates down to the surface of the delivery stack 9. If, in the case of an ultrasonic distance sensor, a signal is provided that a false-sheet 7.1 lies on a stop plate, then a drive, in particular the linear drive of the side gerotor 16, can be controlled by means of the control device so that the stop plate for aligning the false-arc 7.1 is moved away from the stack side surface , By an occurring acceleration of the stop plate of the false sheet 7.1 drops by its inertia from the stop plate down on the surface of the delivery stack 9. The stop plates can be made bevelled at the top outwards. If the original false sheet 7.1 is properly stored on the delivery stack 9, a further orientation of the following sheets 7 can be effected by the side straight pushers 16.

In a further development, it is provided that the position of the false-arc 7.1 can be determined quantitatively by means of the at least one side-edge sensor 17. In this case, the value of the projection of the false-arc 7.1 over the side edge stop 16 and / or an angle value of the side edge of the false-arc 7.1 relative to the sheet transport direction 39 can preferably be determined. This is preferably done by means of the control device which determines from the data obtained, the lateral movement of the side or the gerager 16 including the necessary stroke. The in normal operation a periodic shaking motion performing side-gerstoßer 16 are temporarily adjusted by the control device in case of need to the necessary stroke. In the case of an ascertained imbalance of the false-arc 7.1, an actuator control for correcting the tilted position of the false-arc 7.1 and / or the following sheet 7 can alternatively or additionally be undertaken. For example, the imbalance can be done by targeted change in the speed and / or braking effect of the brake elements of the brake unit 13 across the sheet width.

In Fig. 4 is shown above the leading edge stops 12 a gripper carriage 8 with a chain guide 22 in the deflection. About the leading edge stops 12 and the rotating gripper carriage 8, a detection unit 24 is positioned on a holder 23. The detection unit 24 has at least one here but preferably two scanning sensors 25, 26, which are arranged at a distance from each other. The scanning sensors 25, 26 are arranged transversely to the sheet transport direction 39 and so that it is possible to detect the presence or absence of the slant sheet 7.2 transported to the delivery stack 9 and with the sheet leading edge at least partially over the leading edge stops 12. The scanning of the front edge stops 12 in the sheet transport direction 39 subsequent leading edge monitoring area 12.3 by the Abtastsensoren 25, 26 takes place at points 25.4, 26.4 by sensor beams 25.3, 26.3. The sensor beams 25.3, 26.3 intersect the points to be monitored 25.4, 26.4. The leading edge monitoring area 12.3 extends from the front edge stop plane 12.2 spanned by the leading edge stop surfaces 12.1 of the leading edge stops 12 in the sheet transport direction 39 up to 100 mm, preferably from 1 mm to 50 mm and more preferably from 2 mm to 10 mm. The points 25.4, 26.4 located in this leading edge monitoring area 12.3 are preferably spaced apart from the leading edge stop plane 12.2, so that, for example, a movement of the delivery stack 9 during lowering does not generate any error signals. The monitoring is preferably carried out at defined times or at defined machine angles, preferably constantly when no gripper carriage 8 passes the sensor beams 25.3, 26.3. In the same way, overspill sheets which protrude beyond all sheet edge stops 12 concerning the sheet format are detected. Alternatively or additionally, the detection unit 24 can also detect the specific position of the sheets 7 relative to the leading edge stops 12.

The Fig. 5 shows a plan view of the delivery stack 9 with properly deposited on the leading edge stops 12 sheet 7, which form the delivery stack 9. The Leading edge stops 12 are here shown preferably arranged symmetrically to a machine center 38. The detection unit 24 monitors here preferably with the scanning sensor 25 and the scanning sensor 26 in the leading edge monitoring area 12.3 of the leading edge stops 12 a working width transverse to the sheet transport direction 39. The working width is at least the transversely and horizontally to the sheet transport direction 39 extending extension of a minimum to be processed by the machine Bogenformates 27. Also shown is the possible location of a crook 7.2 on the delivery stack. 9

The monitoring of the sheet position is particularly preferably contactless. The scanning sensors 25, 26 of the detection unit 24 can be designed, for example, as optical, in particular photoelectric, sensors or as ultrasonic sensors. In the illustrated embodiment, the scanning sensors 25, 26 each include a transmitter / receiver 25.1, 26.1 and a respective reflector 25.2, 26.2. Transmitter / receiver 25.1, 26.1 are preferably arranged on the one side and the reflectors 25.2, 26.2 on the opposite side of the gripper carriage track. This minimizes the necessary cabling. The reflectors 25.2, 26.2 are shown here arranged between the leading edge stops 12. In alternative embodiments, not shown, the reflectors 25.2, 26.2 may also be connected to the leading edge stops 12 or the leading edge stops 12 themselves are used as reflectors 25.2, 26.2. The detection unit 24 is connected via an evaluation unit to the machine control station and / or the machine control, wherein the evaluation unit can also be integrated in the machine control. Accordingly, the machine control can also be connected to the side-edge sensors 17 and / or the rear-edge sensors 15 and evaluate their signals together. The distance of the scanning sensors 25, 26 is preferably selected such that they are just within a characteristic of the sheet-processing machine minimum sheet size 27. Alternatively, the scanning sensors 25, 26 may also include a sensor element on one side of the Have gripper carriage track and a cooperating with this receiver element on the other side of the gripper carriage track. At least one of these elements is arranged below the highest point of the leading edge stops 12.

The arranged in the delivery between the chains 6 and constantly rotating with these gripper carriage 8 detect lying on the printing cylinder 1 sheet 7 at the sheet leading edge and transport them on the sheet guide, in particular the sheet guide plate 18, and the brake unit 13 in the sheet transport direction 39 to the delivery stack If the sheets 7 pass through the region of the brake unit 13, they are, for example, picked up by the suction belts 13.1 and released by the gripper carriages 8. By means of the brake unit 13, the sheet 7 are delayed to a transport speed reduced storage speed and released after reaching this speed, so that the released sheet 7 aligned with the storage speed against the leading edge stops 12 and aligned with these and at the opposite trailing edge stops 14 the delivery stack 9 are deposited, wherein the delivery stack 9 is lowered according to the stored sheet 7, so that the stacking surface has a constant level for incoming sheets 7.

Usually, the side edge stops 16 and Seitengeradstoßer 16 are arranged on the sides of the delivery stack 9, which align the sheet 7 with respect to the position of their side edges and are monitored by the side edge sensors 17 and / or rear edge sensors 15. Now, for example, as in Fig. 5 shown, by the suction belts 13.1 of the brake unit 13 a slant 7.2 so placed on the delivery stack 9, that an interruption of the beam path of the sensor beam 26.3 of the Abtastsensors 26, in a detection unit 24 downstream evaluation unit generates a signal indicating a slant 7.2. Thus, the sheet feed to the sheet processing machine can be interrupted, these empty and the Schiefbogen 7.2 removed or corrected its location.

It is also possible, after a slant sheet 7.2 has been displayed, to continue operating the machine and to correct the position of the slant sheet 7.2 on the delivery pile 9.

In Fig. 4 the holder 23 is associated with a further detection unit 29. This further detection unit 29 has at least one further scanning sensor 30, which in the exemplary embodiment is designed as an optical, in particular photoelectric, sensor and contains a transmitter / receiver 30.1 and a reflector 30.2. The further detection unit 29 is arranged in the delivery that approximately the deflection of the gripper carriage 8 can be detected. By the further detection unit 29, this area is monitored to see whether sheet 7 or parts of these were entrained by the gripper carriage 8. If this is the case, the generation of an emergency stop signal can take place by means of an evaluation unit cooperating with the further detection unit 29, which can be fed to the machine control and displayed on the control station. Thus, an accident of the sheet processing machine can be prevented by entrained by the gripper carriage 8 sheet 7.

By the further detection unit 29 is preferably also ensured that it is in the detected by means of the detection unit 24 overshoot bow or inclined sheet 7.2, which require a Leerfahren the machine and / or a correction of the sheet position on the delivery stack 9, actually about such sheet 7. In order to avoid error signals during the passage of the gripper carriage 8 through the sensor beams 25.3, 26.3, 30.3, these error signals must be hidden. This is done here by a half-cycle driven switching flag, which activates angle-dependent arranged initiators. Alternatively, the error signals caused by the gripper carriage 8 can be filtered by software or the like.

In order to avoid depositing color of the freshly printed sheets 7 in sheet-fed rotary printing presses, powder can be placed between the sheets 7 to be deposited on the delivery stack 9 via the dusting unit 20. Despite known facilities to prevent the deposition of powder on the work organs provided in the display can not be ruled out that powder z. B. on the Abtastsensoren 25, 26, 30 of the detection units 24, 29 stores, which can lead to malfunction. In order to enable safe operation of the detection units 24, 29, at least one cleaning element can be assigned to one or each detection unit 24, 29, in particular one or preferably each scanning sensor 25, 26, 30.

The Fig. 6 shows a scanning the sensors 25, 26, 30 associated cleaning unit 31 containing in the embodiment, a nozzle unit 32 with a Blasluftzuführung 33. Preferably, each of the Abtastsensoren 25, 26, 30 associated with a nozzle unit 32. Each nozzle unit 32 is in particular provided with a first outlet opening 32.1 and a second outlet opening 32.2, the blown air jet 34 of the first outlet opening 32.1 on the sensor / receiver 25.1, 26.1, 30.1 and the blown air jet 35 of the second outlet opening 32.2 on the reflector 25.2, 26.2, 30.2 is directed. To clean the Abtastsensoren 25, 26, 30 of the detection units 24, 29 are not shown means the Blasluftzuführungen 33 is activated and so powder deposits removed. The cleaning unit 31 can be executed as desired or its activation can be coupled to specific work steps, such as, for example, the change of the delivery stack 9.

The Fig. 7 shows a development of the display with a detection unit 24 for detecting overshoot sheet and inclined sheet 7.2 in the front edge stops 12 in the sheet transport direction 39 downstream leading edge monitoring area 12.3. The detection unit 24 here also has at least two scanning sensors 25, 26 which are spaced apart from one another and which generate sensor beams 25.3, 26.3 preferably parallel to the front edge stop plane 12.2 formed by the front edge stop surfaces 12.1 of the front edge stops 12. The leading edge stop surfaces 12.1 of the leading edge stops 12 are the to Delivery stack 9 directed surfaces at which the correctly released and deposited sheets 7 are aligned at the front edge. The leading edge stop surfaces 12.1 of the leading edge stops 12 have at least one vertical extent and preferably an extent transverse to the sheet transport direction 39, in particular a horizontal extent. Each scanning sensor 25, 26 here preferably has a sensor / receiver 25.1, 26.1 and a reflector 25.2, 26.2. The sensors / receivers 25.1, 26.1 are assigned to a holder 23 within the gripper carriage track in the deflection region of the gripper carriages 8. The holder 23 may be embodied, for example, as a cross-member arranged over the machine width with openings for the sensors / receivers 25.1, 26.1. The traverse can be connected independently or with a blow frame. As a holder 23 but also the blow frame itself can be used.

The reflectors 25.2, 26.2 are here associated with a receptacle arranged below the gripper carriage track, which is equipped with recesses for the leading edge stops 12 over the machine width. The receptacle is preferably designed here as a cross-member or grid structure arranged over the machine width, wherein the reflectors 25.2, 26.2 can be integrated in the surface of the receptacle. Preferably, a frame-fixed arranged grid structure 36 is used, which receives more machine elements on its underside. The machine elements are here separating elements, in particular test sheet finger 37, which are for retracting test sheet in the direction of the delivery stack 9 between falling sheet 7 for receiving this retractable. The test sheet fingers 37 are designed here as pneumatic cylinders. As a result of the arrangement of the receptacle fixed to the frame, the connected reflectors 25.2, 26.2 remain stationary and active even during a test sheet removal. The leading edge stops 12 can be made pivotable for sample sheet removal. Accordingly, a monitoring of the filing process can also take place uninterruptedly during a test sheet extraction. Also during a stack change, especially one Non-stop stack change, can be monitored without interruption by the detection unit 24 of the filing process.

In this case, the display further contains a further detection unit 29 arranged downstream of the detection unit 24 in the sheet transport direction 39 for the detection of machine overshoot sheets. The further detection unit 29 disposed downstream in the direction of the rotating gripper carriage 8 of the detection unit 24 likewise has a further scanning sensor 30 with a sensor / receiver 30.1 and a reflector 30.2. Preferably, the sensor / receiver 30.1 of the further detection unit 29 is accommodated in an opening of the holder 23 formed, for example, as a traverse. Via a connection of the detection units 24, 29 via a common evaluation unit or each detection unit 24, 29 associated evaluation units with a controller, in particular the machine control, and preferably the control station corresponding information and / or functions, in particular machine functions triggered. At least one, but preferably all, of the sensors / receivers 25.1, 26.1, 30.1 and reflectors 25.2, 26.2, 30.2 is here also assigned a cleaning unit 31.

The Fig. 8 shows a plan view of the grid structure 36 with integrated reflectors 25.2, 26.2 in the display. The lattice structure 36 here preferably has slits oriented in the direction of the sheet transport 39, which allow air circulation in the delivery. The reflectors 25.2, 26.2 are here integrated in the gripper carriage track facing surface of the grid structure 36. The reflectors 25.2, 26.2 are within a distance from each other, which here corresponds to the minimum of the machine to be processed sheet material so the minimum sheet size 27. This means that the reflectors 25.2, 26.2 are arranged so far apart that the smallest sheet format to be processed over the machine width still covers one of the reflectors 25.2, 26.2 in the case of a crook 7.2 and both reflectors 25.2, 26.2 in the case of an overshoot arc.

The Fig. 9 shows a perspective view of a section of the display with integrated in the grid structure 36 reflectors 25.2, 26.2. The sensors / receivers 25.1, 26.1 cooperating with the reflectors 25.2, 26.2 are arranged above and particularly preferably vertically above the reflectors 25.2, 26.2 within the deflection region of the gripper carriages 8. The sensor / receiver 30.1 of the further detection unit 29 cooperates with a reflector 30.2, not shown, which is preferably arranged in the direction of rotation of the gripper carriage 8 after the turning point outside the chain guides 22 approximately in the middle of the machine width.

The Fig. 10 shows a preferred embodiment of the display with in the example designed as Traverse holder 23 integrated cleaning unit 31 for all scanning sensors 25, 26, 30 of the detection units 24, 29 seen in the sheet transport direction 39. The cleaning unit 31 includes an actuatable blast air supply 33 which supplies the blast air to the nozzle unit 32 associated with each scanning sensor 25, 26, 30. The pneumatic pressure available to the cleaning unit 31 is preferably manually or automatically adjustable and is particularly preferably monitored. The Blasluftzuführung 33 cooperates with a side of the example designed as Traverse holder 23 associated connection and distributes the applied blowing air here exemplified two distributors to the nozzle units 32 of the Abtastsensoren 25, 26, 30. Each nozzle unit 32 directs the applied blowing air here also preferred to the sensors / receivers 25.1, 26.1, 30.1 and the reflectors 25.2, 26.2, 30.2 as already described above.

The Fig. 11 shows a section of the top view of the delivery stack 9 with within a transversely to the sheet transport direction 39 extending minimum working width, ie within a characteristic for the sheet processing machine minimum sheet size 27, arranged front edge stops 12. The properly filed sheet 7 lie in the sheet transport direction 39 to the Leading edge stop surfaces 12.1 of the leading edge stops 12 from. The monitored by the scanning sensors 25, 26 of the detection unit 24 points 25.4, 26.4 are located in the sheet transport direction 39 of the leading edge stop plane 12.2 downstream in a leading edge monitoring area 12.3 and transversely to the sheet transport direction 39 within the extended in the sheet transport direction 39 on the leading edge stop plane 12.2 also minimal Sheet format 27.

There is provided a delivery for a sheet processing machine with a sheet 7 to a delivery stack 9 and with a sheet leading edge of the sheets 7 on at least two leading edge stops 12 transporting Bogenfördersystem, wherein the at least two leading edge stops 12 define a leading edge stop plane 12.2, wherein at least one further stop 16, 14 is provided for aligning the delivery stack 9 at a further edge of the delivery stack 9 and wherein at least one detection unit 24, 29 for monitoring at least one point 25.4, 26.4, 30.4 is formed, which is downstream in the sheet transport direction 39 of the leading edge stop plane 12.2 and wherein further at least one of the leading edge stop plane 12.2 in the sheet transport direction 39 upstream point 17.2, 15.2 is monitored. Preferably, at least one sensor 17, 15 for monitoring at least one point 17.2, 15.2 is formed, which is upstream in the sheet transport direction 39 of the leading edge stop plane 12.2.

The at least one detection unit 24, 29 is designed, in particular, as a detection unit 24, 29 which monitors the non-contact monitoring of the point 26.4, 26.4, 30.4 downstream of the front edge stop plane 12.2. Preferably, the at least one detection unit 24, 29 for monitoring at least two points 25.4, 26.4, 30.4 is formed, which lie transversely to the sheet transport direction 39 spaced from each other of the leading edge stop plane 12.2 downstream. The at least one of the leading edge stop plane 12.2 downstream to be monitored point 25.4, 26.4, 30.4 or the at least two monitored points 25.4, 26.4, 30.4 are preferred within a minimum working width 27 extending transversely to the sheet transport direction 39, in particular within a minimum sheet format 27 to be processed with the delivery. The at least one detection unit 24, 29 is particularly preferably a sensor beam 25.3 used for monitoring the at least one point 25.4, 26.4, 30.4. 26.3, 30.3 arranged generating. For this purpose, the at least one detection unit 24, 29 may have at least two elements which limit a sensor beam 25.3, 26.3, 30.3.

In addition to the at least one point 25.4, 26.4, 30.4 downstream of the leading edge stop plane 12.2 in the sheet transport direction 39, the points 17.2, 15.2 upstream of the leading edge stop plane 12.2 can also be monitored by the at least one detection unit 24, 29. Alternatively, in addition to the at least one detection unit 24, 29, a further sensor 17, 15 are used for monitoring. The at least one detection unit 24, 25 or the at least one detection unit 24, 25 and the further sensor 17, 15 are advantageously connected to an evaluation or control device, wherein the evaluation or control device in case of improper sheet deposition a machine function, in particular a machine stop, initiated. The evaluation or control device can also be integrated in the machine control. Further, the evaluation or control device can be in operative connection with at least one actuator to sheet position correction.

At the point 17.2, 15.2 upstream of the leading edge stop plane 12.2, the position of at least one sheet 7 with respect to the further stop 12, 14, 16 is preferably monitored. Preferably, a sensor 17, 15 for monitoring the position of at least one sheet 7 with respect to the further stop 16, 14 is arranged, formed and / or arranged. If it is detected at the point to be monitored 17.2, 15.2 that an improper sheet deposition is present, a machine function, in particular a machine stop, can be initiated. The machine function can be in Dependence of a processed printing material to be initiated. Alternatively or additionally, in the event of an improper sheet deposition, a sheet position correction can be undertaken.

The front edge stop plane 12.2 upstream point 17.2, 15.2 can be inside or outside the stack floor plan 9.1. The stacking plan 9.1 can be described by the four vertical edges intersecting the sheet edges or the levels of the stack side surfaces. Furthermore, the point 17.2, 15.2 to be monitored preferably lies between a gripper carriage track of the sheet conveying system and the surface, in particular the last correctly deposited sheet 7, of the delivery stack 9. The point 17.2, 15.2 to be monitored can be in the area and / or height of the stops 12, for example , 16, 14 of the delivery stack 9 are located.

For monitoring the at least one of the leading edge stop plane 12.2 upstream point 17.2, 15.2 is preferably from the at least one sensor 17, 15, a sensor beam 17.1, 15.1 generated, which the point 17.2, 15.2. cuts. The sensor beam 17.1, 15.1, the stack floor plan 9.1 or a stop plane 12.2, 14.2, 16.2 of the stops 12, 14, 16 cut or approximately vertically aligned a projection of a sheet 7 at a stop 12, 14, 16 recognize. Particularly preferably, the sensor beam 17.1, 15.1 includes a vertical direction component, in particular in the direction of the gripper carriage track. The at least one sensor 17, 15 is preferably designed as a non-contact sensor 17, 15 and may be formed as an ultrasonic sensor 17, 15 or as an optical sensor 17, 15. The at least one sensor 17, 15 is particularly preferably arranged in the sheet transport direction 39 in front of the leading edge stop plane 12.2.

Preferably, the at least one of the leading edge stop plane 12.2 upstream point 17.2, 15.2 is monitored without contact. In particular, the at least one sensor 17, 15 is therefore for non-contact monitoring of the position of at least one Arch 7 with respect to the further stop 12, 14, 16 is formed. Particularly preferred is the at least one sensor 17, 15 for non-contact monitoring of the position of individual sheets 7 of a sheet sequence with respect to the further stop 12, 14, 16 is formed. Preferably, however, several, different edges of the delivery stack 9 associated points 17.2, 15.2 monitored. Further, the or several sensors 17, 15 for monitoring at least two spaced-apart points 17.2, 15.2 formed. In this case, a plurality of points 17.2, 15.2 to be monitored are preferably assigned to different sides of the delivery stack 9, wherein two points 17.2 to be monitored can be assigned to opposite sides of the delivery stack 9. Furthermore, another point 15.2 to be monitored can be assigned to a further edge, in particular a trailing edge, of the delivery stack 9.

Preferably, the at least one sensor 17, 15 for monitoring the front edge stop plane 12.2 upstream point 17.2, 15.2 spaced from the stop surface 16.1, 14.1 of the further stop 16, 14 are arranged. In a further development, the at least one sensor 17, 15 is arranged at a distance from the further stop 16, 14. The at least one point to be monitored 17.2, 15.2 can be moved to a sheet format in a format adjustment of the delivery. For this purpose, the at least one sensor 17, 15 may be accommodated displaceable for format adjustment. For example, the at least one sensor 17 may be assigned to a side edge stop 16, in particular a side straight stub 16. Alternatively or additionally, a sensor 15 may be associated with a rear area, in particular a trailing edge stop 14, of the delivery stack 9. In particular, a sensor 15 of a format-adjustable braking station can be assigned to a brake unit 13. Particularly preferably, at least two sensors 15, in particular in the lateral areas, are associated with trailing edge stops 14.

During sheet travel, it is possible to monitor at the at least one point 17.2, 15.2 upstream of the leading edge stop plane 12.2 whether there is a correct sequence of sheets or whether there is a faulty sheet position. In this case, a sensor signal can be emitted by the at least one detection unit 24, 29 and / or the at least one sensor 17, 15 if a proper sheet deposition takes place or alternatively if no proper sheet deposition takes place. In particular, the sensor signals of several monitored points 17.2, 15.2, 25.4, 26.4, 30.4 are evaluated jointly. An improper sheet deposition can be detected, for example, if at least one of the points to be monitored 17.2, 15.2, 25.4, 26.4, 30.4, for example by the evaluation or control device, a faulty sheet position is detected. The monitoring of several, in particular all, points 17.2, 15.2, 25.4, 26.4, 30.4 to be monitored is particularly preferably carried out simultaneously, so that a rapid reaction can take place. It can be distinguished, for example, from the evaluation or control device between a false sheet 7.1, a slant 7.2 and a clamping sheet, which is clamped between two stops 12, 14, 16. In addition, the machine function is initiated as a function of the detected error case. A machine function may include, for example, a printing of the machine, in particular at the speed of production. A change in the machine speed can also be covered by the machine function.

There is provided a delivery for a sheet-processing machine with a sheet conveying system for conveying sheets 7 via a delivery stack 9, wherein at least one stop 12, 14, 16 is provided for aligning the delivery stack 9, wherein at least one sensor 15, 17, 25, 26 , 30 for monitoring the position of at least one sheet 7 with respect to the stop 12, 14, 16 is provided, and wherein the sensor 15, 17, 25, 26, 30 is formed to monitor a point 17.2, 15.2 inside the stacking plan 9.1. The stacking plan 9.1 can thereby by the four vertical planes intersecting the sheet edges or the levels of the stack side surfaces will be described.

Preferably, the sensor 15, 17, 25, 26, 30 is set up, formed and / or arranged for detecting the arc fall of one or more successive falling sheets 7 inside the stackable floor plan 9.1. In particular, the sensor 17 for monitoring the position of the sheet side edges with respect to a side edge stopper 16, in particular a Seitengeradstoßers 16, is provided. Particularly preferably, at least two sensors 17 arranged on opposite sides with respect to the delivery stack 9 are designed to jointly detect the sheet fall.

The sensor 15, 17 may, for example, be arranged to produce a stacking plan 9.1 or a stop plane 12.2, 14.2, 16.2 of the stops 12, 14, 16, intersecting sensor beam 15.1, 17.1. Particularly Favor is the sensor beam 17.1, 15.1 a stop plane 12.2, 14.2, 16.2 below a common cut line 28 of gripper carriage level 8.1 and stop level 12.2, 14.2, 16.2 arranged cutting. The sensor beam 15.1, 17.1 thus intersects the vertical stack side surface below the cut line 28 and above the forming stack surface. The gripper carriage level 8.1 can be spanned by the gripper carriage track extending directly above the delivery stack 9 in the sheet transport direction 39 or by gripper mounts 8 moving horizontally in the sheet transport direction 39 directly above the delivery stack 9. By the stop plane 12.2, 14.2, 16.2 intersecting sensor beam 15.1, 17.1 arc 7 are detected, which have already covered a fall distance between the stops 12, 14, 16. Thus, in particular also between the stops 12, 14, 16 fixed sheet 7, so for example clamping sheet, can be detected, which are otherwise not detectable.

From the at least one sensor 15, 17, a sensor signal can be output, when a falling arc 7 is detected or detected. Preferably, a plurality of sheets 7, in particular immediately following one another, are detected. Further forming the sensor 15, 17, 25, 26, 30 is connected to an evaluation or control device in communication, which data are available on the sheet transport. The sensor signals of the sensor 15, 17 are preferably compared by the evaluation or control device with setpoint values, wherein when a tolerance is exceeded, a machine function, in particular a machine stop, is initiated.

The Fig. 12 shows a delivery stack 9 seen in the sheet transport direction 39 with sensor-monitored side edge stops 16. The side edge stops 16 are here preferably designed as against the stack side edges of the delivery stack 9 movable Seitengeradstoßer 16. The side edge stops 16 each have a stop area 16.1 facing the stack area of the delivery stack 9, each of which spans a vertical side edge stop plane 16.2. The side edge stop planes 16. 2 are preferably oriented vertically and aligned parallel to the sheet transport direction 39.

At least one preferably all two side edge stops 16, a side edge sensor 17 is assigned. A side edge sensor 17 may, for example, be arranged on a side gerumper 16 without having to perform jogging movements. A side edge sensor 17 generates a sensor beam 17. 1 which is directed in the area located between the side edge stops 16. In particular, the sensor beam 17.1 is directed into the stacking plan 9.1 of the delivery stack 9. In addition to the component oriented in the stacking plan 9.1, the sensor beam 17. 1 preferably also has a vertical component in the direction of the gripper carriage 8 rotating over the delivery stack 9. Preferably, falling sheets 7 are detected or detected by both side edge sensors 17 in a respective side edge monitoring area 16.3. The side edge monitoring area 16.3 may be, for example, from the side edge stop level 16.2 be formed of a side edge stop 16 to about the middle of the delivery stack 9. The side edge monitoring area 16.3 is preferably located adjacent to the side edge stop plane 16.2 and can reach up to 150 mm into the stack ground plan 9.1.

The at least one side edge sensor 17 is in this case connected to an evaluation device or a control device, for example the machine control. By means of the evaluation or control device, the signals supplied by the side edge sensor 17 are compared as actual values with predefinable desired values. In particular, both side edge sensors 17 are evaluated jointly with respect to a respective falling arc 7. If the tolerance value is exceeded, a corresponding machine function can be initiated. In particular, it is detected as a storage error when the side edge sensor 17 does not recognize the sheet 7 at predetermined times and / or when the angular difference (in particular the machine angle as a condition parameter of the printing machine for a dynamic sheet storage monitoring) or the distance between two consecutive adjacent sheets 7 too large or too small. Preferably, the sensor signals can be interpreted as sheet 7, which hangs firmly in the shaft (clamping arch) or as a sheet 7 which is axially offset over one of the side edge stops 16 (bends 7.1 or Schiefbogen 7.2). In this case, it is particularly advantageous that the sheet 7 (clamping sheet) which blocks the storage chute can also be recognized. Particularly preferably both sheets 7 are recognized, which lie outside of the staple plan 9.1 (bends 7.1 or crooked 7.2), as well as bow 7, which block within the storage shaft (clamping arch). In a further development, suitable measures, in particular according to the detected error case, can be initiated, which avoid a breakdown. An improved sheet drop control is thereby created.

There is provided a delivery for a sheet processing machine having a sheet conveying system for conveying sheets 7 via a delivery stack 9, wherein stops 12, 14, 16 are provided for aligning the delivery stack 9, wherein at least one sensor 15, 17, 25, 26, 30 is provided for monitoring the sheet deposition and wherein a sensor 15, 17 is formed such that at least two consecutively falling sheets 7 are detectable. In this case, at least two sensors 15, 17 are preferably spaced apart from one another and designed in such a way that sheets 7 falling simultaneously with them can be detected. For example, at least two sensors 15 spaced apart from one another can be assigned to a stack trailing edge, in particular trailing edge stops 14, and / or a stack side edge, in particular side edge stops 16.

The at least one sensor 15, 17 is preferably designed as a non-contact sensor 15, 17, in particular as an optical sensor or as a laser sensor. With the non-contact sensor 15, 17, the sheets 7 consecutively falling in the sheet deposition are detected. With the sensor 15, 17 while the successive falling sheets 7 are preferably detected individually, the sensor 15, 17 outputs a sensor signal when a falling sheet 7 is detected. Further, the rear edge sensor 15 may be executed with background suppression. Furthermore, a minimum and a maximum scanning location, in particular the monitored point 15.2, 17.2, can be made variable or adjustable.

Furthermore, the at least one sensor 15, 17, 25, 26, 30 can be connected to an evaluation or control device, to which data about the sheet transport are available. This data can be entered or automatically generated. The evaluation or control device has in particular a memory in which characteristic data such as desired values or tolerance values, for example as job-dependent curves, are stored. By means of the evaluation or control device, a comparison of the sensor signals with data on the sheet transport can take place, wherein upon detection of one or more erroneously falling sheets 7, a machine function, in particular a machine stop, can be initiated.

In particular, at predetermined times a control by the sensor 17, 15 at times occur in which the desired position of the sheet 7 exactly known and / or constructive determinable: For example, at a first time shortly after the gripper carriage passage with a bow 7 a sensor query carried out, wherein a sensor signal means that a good sheet, so an error-free falling sheet 7, is present. For example, at a second time just before the gripper carriage passage, a sensor interrogation takes place, wherein a sensor signal means that an incorrectly stored sheet, for example a false-sheet 7.1, is present. For this purpose, the sensor 17, 15 with respect to the sheet transport direction 39 should be positioned in the area in front of the gripper opening of the gripper carriage 8.

The Fig. 13 shows a plan view of a delivery stack 9 in the delivery of a sheet-processing machine, in particular a sheet-fed press, for example, as described above. In the display front edge stops 12, side edge stops 16 and trailing edge stops 14 are provided. The leading edge stops 12 clamp a leading edge stop plane 12.2, in the sheet transport direction 39 at least one sensor 15, 17 for monitoring the sheet deposition and / or the position of the sheet 7 with respect to at least one stop 12, 14, 16 upstream. Shown are Hinterkantensensoren 15, which monitor the sheet deposition and the position of the sheet 7 with respect to the trailing edge stops 14 and / or the side edge stops 16. The Hinterkantensensoren 15 are assigned to the trailing edge stops 14 adjacent and designed as non-contact sensors, in particular optical sensors, for example as a CCD sensor, or laser sensors. These have a sufficiently good response. In particular, at least two trailing edge sensors 15 are spaced from each other associated with the lateral areas. Further development takes place a format adjustment of the rear edge sensors 15, so that they can always be directed to the lateral areas of the sheet trailing edge. Due to the lateral arrangement of Beet edge sensors 15, both the position of the sheet trailing edges with respect to the trailing edge stops 14 as well as indirectly the position of the sheet side edges with respect to the side edge stops 16 are monitored.

Particularly preferably, a rear edge sensor 15 is associated with a format-adjustable braking station of the brake unit 13, so that positioning of the rear edge sensors 15 can be carried out on the current sheet format. Due to the format setting of the at least one brake element, for example, a suction belt 13.1, carrying braking station is an automatic format setting of the connected Hinterkantensensors 15. However, it can also be provided with additional braking points with edge sensors 15 so that the accuracy of monitoring the sheet trailing edges can be improved over the format width , Particularly preferably, a trailing edge sensor 15 is attached to each braking station, so that an evaluation in the endangered lateral or outer format range is always ensured.

Preferably, the rear edge sensor 15 is designed and arranged generating a sensor beam 15.1, so that the sheet fall area can be monitored. It is preferred that each individual falling sheet 7 is detected. In a faulty filed sheet 7, for example, stored on a side edge stop 16 and / or a suction belt 13.1 bends 7.2, an improper sequence of sheets and thus an improper sheet storage is detected. An improper sheet deposition classified as safety-relevant can then lead to initiation of a machine function, in particular to a machine stop, as already described above.

The Fig. 14 shows a delivery stack 9 from the side with a arranged in front of the delivery stack 9 brake unit 13. The brake unit 13 here contains a braking station with circumferentially driven suction belt 13.1 and brake band to delay each released sheet 7 of machine speed to storage speed. The Brake station and other braking stations, not shown, are in particular attached to a transversely to the sheet transport direction 39 arranged traverse 14 movable. Preferably, a format-dependent adjustment of the braking stations on the sheet width of the cross member 14 is carried out. The traverse 14 can align the trailing edge stop 14, the sheet trailing edge of the sheet 7 to be deposited. Further forming the traverse 14 separate rear edge stops 14 may be assigned in particular movable, at which align the sheet trailing edges of the sheet 7 to be deposited. The trailing edge stops 14 may, for example, be assigned to the traverse 14 so as to be pivotable about a pivot axis oriented in the sheet transport direction 39. The traverse 14 and / or the trailing edge stops 14 each have a stacking area of the delivery stack 9 facing stop surface 14.1, which span a stop plane 14.2. The stop plane 14.2 is preferably oriented vertically and transversely to the sheet transport direction 39 aligned.

The or the rear edge stops 14, the at least one rear edge sensor 15 for detecting the falling sheet 7 is assigned. The rear edge sensor 15 may be arranged, for example, above the traverse 14. The rear edge sensor 15 is preferably arranged at a distance of 0 to 150 mm, but preferably 10 to 50 mm, from the stop plane 14. 2, that is to say from the sheet trailing edges falling vertically here. For example, the trailing edge sensor 15 detects the sheet trailing edge at a height of 20 to 40 mm above the stack surface. The at least one rear edge sensor 15 may be associated with the traverse 14 fixed or movable. In order to improve the quality of the measurement result, the one or more rear edge sensors 15 can be designed to be rotatable and / or pivotable. Preferably, the rear edge sensor 15 but assigned to a braking station and thus adjusted with this. Further, the rear edge sensor 15 can be height-adjustable, for example, with the level control of the stacking surface executed. The sensor beam 15.1 generated by the rear edge sensor 15 may have an extension directed at least approximately horizontally in the direction of the sheet drop region.

Shown is the sensor beam 15.1 with a downward component. Furthermore, the inclination of the sensor beam 15.1 to the horizontal can also be variable or adjustable.

The sheets 7 following the sheet fall area pass through the sensor beam 15.1 and are detected at a monitored point 15.2 by means of a receiver or pickup of the rear edge sensor 15. The monitored by the rear edge sensor 15 point 15.2 can be within the Bogenfallbereiches or at the sheet trailing edge. In particular, the sheet trailing edge can be recognized very well, for example as a line from the optical sensor or laser sensor. The rear edge sensor 15 is preferably designed such that in each case individual sheets 7 of a sequence successively falling sheet 7 can be detected. The one or more Hinterkantensensoren 15 are connected to an evaluation or control device, such as the machine control in connection. By means of the evaluation or control device, the signals transmitted by the rear edge sensor 15 are compared with predefinable desired values. For example, at least two, in particular the outer, or all Hinterkantensensoren 15 are evaluated together with respect to a single respective falling arc 7. If the tolerance value is exceeded, a corresponding machine function can be initiated. In particular, it is detected as a storage error when a back edge sensor 15 does not recognize the sheet 7 at predetermined times and / or when the angular difference (in particular the machine angle as a condition parameter of the printing machine for a dynamic sheet storage monitoring) or the distance between two successive falling immediately adjacent sheet 7 to big or too small. Preferably, the sensor signals can be interpreted as sheet 7, which hangs firmly in the shaft (clamping arch) or as a sheet 7 which is axially offset over one of the side edge stops 16 and / or trailing edge stops 14 (bends 7.1 or Schiefbogen 7.2). Further, it is provided over the sheet width at least three Hinterkantensensoren 15 and / or preferably on both sides of the sheet two in the sheet fall direction successively arranged rear edge sensors 15 use. This creates the possibility of determining the falling speed and / or the surface profile of the falling sheets 7. From these results, the fall rate influencing elements, such as fans of the blower frame, blowpipes, etc., targeted, controlled and the sheet fall can be selectively changed. Furthermore, color deposits (pimples) can thus be avoided or the retraction movement of an auxiliary stacking table (for example non-stop roller blind 41) into the stacking area can be carried out without problems. In this case, existing sensors, such as sensors for determining the stack height, the stack level, etc., can be connected to the evaluation or control device, and their signals are integrated into the results. Through targeted sensor evaluation special quality problems, such as cornering, for example at the sheet trailing edge, can be detected. By increasing the blowing pressure of the corner blowers then the quality defect can be eliminated. The elimination of defects can be done in particular by notification to the printer or automatically by the machine. Such a sensor arrangement can likewise be used on an arc side edge, so that the possibility of influencing the sheet deposition can be further improved. A sheet position sensor can also be arranged above the delivery stack 9, for determining the surface profile of the falling sheet. 7

The Fig. 15 shows further forming another sensor 40 below the Hinterkantensensors 15, which is provided for example as a stacking gap sensor 40 for controlling a non-stop roller blind 41 in an arc gap. The sensor signals or data supplied by this stacking distance sensor 40 can be linked, in particular, by the evaluation or control device, for example the machine control, to the sensor signals or data of the or the edge edge sensors 15. By the evaluation or control device can be made a common evaluation of the sensor signals or data. By the evaluation or control device can thereby be carried out a check, for example. For plausibility become. Furthermore, the achievable accuracy of the position determination of sheet edges by the plurality of sensors 15, 40 can be increased. The further sensor technology can be used to test whether retraction of the non-stop roller blind 41 can be carried out without difficulty. Continuing education can be found in the detection of the gap between two successive falling sheet 7 to bow influencing means, such as the non-stop roller blind 41, sheet gripper, Bogensauger, Bogenbläser defined in the determined space to move into the stacking plan 9.1 into it. Preferably, there is the possibility of realizing the cheapest Einfahrzeitpunkt using appropriate software. Further developing a sheet counting by the at least one sensor 15, 40 could be performed.

The evaluation of the sensor signals can be carried out by the evaluation or control device, for example, such that angle values (in particular of the machine angle as the state parameter of the printing machine for dynamic sheet storage monitoring) are determined when a respective sheet 7 passes a sensor beam 15.1 of a trailing edge sensor 15. In the evaluation or control device, target values can be stored, for example, as angle values, which can be entered, automatically generated or learned. These target values can be stored depending on the processing speed, sheet format, blowing pressure of the blow frame, etc. If the angle values determined by the evaluation or control device from the sensor signal generated by the rear edge sensor 15 deviate from the desired value, possibly taking into account tolerances, it is possible to conclude that the sheet 7 has been stored incorrectly (overflow sheet, false sheet 7.1, oblique sheet 7.2, clamping sheet) become. If sheets 7 are not properly located between the side edge stops 16 and the side rack 16, the sheet trailing edges pass the sensor beams 15.1 of the trailing edge sensors 15, particularly at different machine angles.

By further sensors 15, 17, 25, 26, 30 and / or further evaluation of Sensor signals, the error case can be limited or determined. Suitable machine functions can be initiated as a function of the determined error case. The sheet position can also be determined from the sensor signals delivered by the stacking edge sensor 40, it being possible to decide after the evaluation whether the non-stop roller blind 41 can enter the curved sheet area unhindered. This prevents in particular that the non-stop roller 41 abuts against a sheet trailing edge during retraction. Further education, all sensors 15, 17, 25, 26, 30 are regularly cleaned in particular by blown air in order to improve the function. This can be done individually or regularly, for example, in a stack change or actuation of the delivery flap.

The Fig. 16 shows a stacking plan 9.1 of a display stack 9 with possible monitoring areas. In this case, arranged in the display not shown sensors 25, 26, 30 monitor a leading edge monitoring area 12.3, which is a downstream of the front edge stop surfaces 12.1 of the leading edge stops 12 spanned leading edge stop plane 12.2 in the sheet transport direction 39. At the same time, side edge sensors 17 can monitor side edge monitoring areas 16.3, which extend from one side edge stop plane 16.2 spanned by the side edge stop surfaces 16.1 of the side edge stops 16 in the direction of the stacked floor plan 9.1. As an alternative or in addition, the areas outside the stack floor plan 9.1 can also be monitored for erroneously filed sheets 7. Alternatively or additionally, rear edge sensors 15 can monitor a trailing edge monitoring area 14.3 downstream of a trailing edge stop plane 14.2 spanned by the trailing edge stop surfaces 14.1 of the trailing edge stops 14 in the sheet transport direction 39.

List of used reference numbers

1

pressure cylinder

2

drive sprocket

3

nose wheel

4

wave

5

wave

6

Chain

7

arc

7.1

false arch

7.2

crooked bow

8th

gripper carriages

8.1

Gripper carriages level

9

delivery pile

9.1

Stack layout

10

stacking plate

11

lifting chain

12

Leading-edge stop

12.1

Leading-edge stop surface

12.2

Leading-edge stop level

12.3

Leading edge surveillance area

13

brake unit

13.1

suction belt

14

Rear edge stop

14.1

Bute stopping surface

14.2

Bute stop level

14.3

Bute monitoring area

15

Trailing edge sensor

15.1

sensor beam

15.2

monitored point

16

Side edge stop, side ratchet

16.1

Side edge stop surface

16.2

Side edge stop level

16.3

Mullion monitoring area

17

Side edge sensor

17.1

sensor beam

17.2

monitored point

18

sheet guide plate

19

dryer

20

pollination unit

22

chain guide

23

holder

24

acquisition unit

25

scanning sensor

25.1

Sensor / receiver

25.2

reflector

25.3

sensor beam

25.4

monitored point

26

scanning sensor

26.1

Sensor / receiver

26.2

reflector

26.3

sensor beam

26.4

monitored point

27

minimal sheet size

28

Line of intersection of gripper carriage plane and stop plane

29

further registration unit

30

additional scanning sensor

30.1

Transmitter-receiver

30.2

reflector

30.3

sensor beam

30.4

monitored point

31

cleaning unit

32

nozzle unit

32.1

first exit opening

32.2

second exit opening

33

blown air

34

air jet

35

air jet

36

lattice structure

37

Sample sheets Finger

38

machine center

39

Sheet transport direction

40

Stack gap sensor

41

Non-stop Rollo

Claims (15)

1. A sheet processing machine having a delivery unit and a sheet conveying system transporting sheets (7) to a delivery stack (9) and having a respective sheet leading edge of the sheets (7) onto at least two leading edge stops (12), wherein the at least two leading edge stops (12) define a leading edge stop plane (12.2),
   wherein at least one further stop (16, 14) is provided for aligning the delivery stack (9) on a further edge of the delivery stack (9) and
   wherein at least one detecting unit (24, 29) is configured for monitoring at least one point (25.4, 26.4, 30.4) which is positioned downstream of the leading edge stop plane (12.2) in the sheet transport direction (39),
   characterized
   in that at least one sensor (17, 15) is configured for monitoring at least one further point (17.2, 15.2) which is positioned upstream of the leading edge stop plane (12.2) in the sheet transport direction (39).
2. The machine according to claim 1, characterized in that the at least one further point (17.2, 15.2) lies within or outside of the stack layout (9.1).
3. The machine according to claim 1 and/or 2, characterized in that the one or more sensors (17, 15) are provided for monitoring two further points (17.2, 15.2) spaced apart from each other.
4. The machine according to claim 1, 2 and/or 3, characterized in that several points (17.2, 15.2, 25.4, 26.4, 30.4) to be monitored are assigned to different sides of the delivery stack (9).
5. The machine according to claim 1, 2, 3 and/or 4, characterized in that a further point (15.2) to be monitored is assigned to a further edge of the delivery stack (9).
6. The machine according to claim 1, 2, 3, 4 and/or 5, characterized in that the at least one sensor (17, 15) is configured for contact-free monitoring of the location of at least one sheet (7) with respect to the further stop (16, 14).
7. The machine according to claim 1, 2, 3, 4, 5 and/or 6, characterized in that the at least one sensor (17, 15) is arranged spaced apart from the stop surface (16.1, 14.1) of the further stop (16, 14).
8. The machine according to claim 1, 2, 3, 4, 5, 6 and/or 7, characterized in that the at least one sensor (15) is assigned to a rear region of the delivery stack (9) and/or the at least one sensor (17, 15) is displaceably held for adjusting a format.
9. The machine according to claim 1, 2, 3, 4, 5, 6, 7 and/or 8, characterized in that the at least one sensor (15) is assigned to a format adjustable brake station of a brake unit (13).
10. The machine according to claim 1, 2, 3, 4, 5, 6, 7, 8 and/or 9, characterized in that the at least one detecting unit (24, 29) is configured as a detecting unit (24, 29) monitoring the point (25.4, 26.4, 30.4) in contact-free manner.
11. The machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 and/or 10, characterized in that the at least one detecting unit (24, 29) is arranged generating a sensor beam (25.3, 26.3, 30.3) for monitoring the at least one point (25.4, 26.4, 30.4).
12. A method for operating a sheet processing machine having a sheet conveying system transporting sheets (7) to a delivery stack (9) and having a respective sheet leading edge of the sheets (7) onto at least two leading edge stops (12), wherein the at least two leading edge stops (12) define a leading edge stop plane (12.2),
    wherein at least one further stop (16, 14) is provided for aligning the delivery stack (9) on a further edge of the delivery stack (9) and
    wherein at least one detecting unit (24, 29) monitors at least one point (25.4, 26.4, 30.4) which is positioned downstream of the leading edge stop plane (12.2) in the sheet transport direction (39),
    characterized
    in that in addition at least one further point (17.2, 15.2) which is positioned upstream of the leading edge stop plane (12.2) in the sheet transport direction (39) is monitored.
13. The method according to claim 12, characterized in that a further point (17.2, 15.2) lying within or outside of the stack layout (9.1) is monitored, wherein in the event of an incorrect sheet delivery a machine function, in particular a machine stop, is initiated and/or wherein a machine function is initiated in dependence on a processed printing material.
14. The method according to claim 12 and/or 13, characterized in that the at least one further point (17.2, 15.2) to be monitored is shifted in the event of a format adjustment.
15. The method according to claim 12, 13 and/or 14, characterized in that a distinction is made between incorrect sheets (7.1), crooked sheets (7.2) and jammed sheets, wherein a machine function is initiated in dependence on a detected error.

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