FR2797800A1 - SUPPORT AND ROTARY MOUNTING UNIT FOR TAPE ROLLERS, ESPECIALLY PRINTED TAPES, AND FOLDER USING SUCH A UNIT - Google Patents

Abstract

This unit is used to clamp and spread a movable take-off roll relative to a rotatably mounted take-up roller at a fixed location. The unit includes positioning means (26) for clamping the movable take-up roller against the web , as well as a support plate (20) carrying adjustable stops (30, 31) for adjusting the stroke of the movable take-off roll. The support plate (19, 20) further carries a prestressing element (35) and a damping element (42) acting on a flange (15) in which the movable take-off roller is rotatably mounted at one end. The support plate (19, 20) can be tilted coaxially with the attachment (21) of a base (34) around this attachment. Applicable to a folder provided at the output of a newspaper printing machine.

Description

The invention relates to a rotary mounting and mounting unit for

  pull rollers that keep a strip under tension along

  its tape path and pass it for example through a folder.

  The U.S. Patent 5 738 620 relates to a rotary mounting of pre-folding and compression rollers in a folder. The rollers have identical diameters and the pairs of rollers are arranged one behind the other in the folding direction. The different rollers of the system are rotatably mounted between two side walls. One of the pre-folding rollers and one of the compression rollers have fixed locations and are rotatably mounted at both ends in the side walls (stationary rollers). The first pre-folding roller is rotatably mounted at its ends and its bearings are arranged on arms carried by the side walls. The bearings of the first pre-folding roller also carry link arms, on which the second compression roller is rotatably mounted. The link arms are loaded by springs perpendicular to the folding direction and are applied against stops. These stops are arranged in the side walls so that the two pre-folding rollers and the two compression rollers do not touch. The coordinated bearings are thus unloaded. The folded copies coming out of the pre-folding rollers, raise the link arms of their stops and create, by this movement,

  a slit or gap that depends on the thickness of the folded item.

  This makes it easier to grab the item.

  The U.S. Patent 5,738,264 discloses a device with which

  pull rollers in a folder are automatically adjustable.

  Facing pull rollers, one of which is stationary and the other of which can be positioned in relation to it, form an adjustable gap between their respective side surfaces. The interval can be changed by an adjusting screw controlled by a servomotor. The turns of the adjusting screw are measured by means of a potentiometer coordinated with it. The journey of

  movement of the screw is limited by a stop provided on the adjustment screw.

  The rollers are clamped against each other by means of a spring, but this also allows the mobile pulling roller to be separated to allow the strip to pass in the event of overload. A sensor detects the relative movements of the adjusting screw and the stop and a programmable control system uses the sensor signals to

control the servomotor.

  In the case of this device known by the US patent. 5 738 264, the operator must enter data so that, subsequently triggered by the sensor, automatic adaptations take place from the

  gap width between the surfaces of the pull rollers.

  The invention aims, in a development of the state of the art, to allow adjustment relative to each other of pulling rollers

  grabbing tapes, regardless of operator intervention.

  Starting from a rotatable mounting and mounting unit for clamping a movable pulling roller against a rotatably mounted clamping roller at a fixed location or stationary roller, and moving the movable pulling roller away from the stationary pulling roller, unit which includes positioning means making it possible to clamp the movable pulling roller laterally against the strip, as well as adjustable stops, carried by a support plate, for adjusting the stroke of the movable pulling roller, the invention achieves this result by the fact that a plate

  support, carrying a prestressing element and a damping element

  acting on a flange, is adjustable, coaxially with respect to a

  device forming an attachment of a base, around this attachment.

  The advantages provided by the solution according to the invention are:

various natures.

  Thanks to the permanent stress on the flange both by a clamping force supplied by the prestressing element and by its connection to a damping element, the mobile roller returns to its initial position in the event of deviations - caused for example by the passage of a glued joint

  thicker tape - without requiring printer intervention

  dies; the configuration according to the invention of the mounting of the pulling rollers brings a lower sensitivity of the pair of pulling rollers, even when the irregular places of the strip pass through the interval between the rollers. With the mounting according to the invention of the movable pulling rollers, the tension of the strip is better kept constant, which

  benefits in particular also the preservation of the cutting location.

  In addition, if the solution according to the invention is applied, the printers are no longer obliged to carry out fine manual adjustment if the

  weight of the tape or the number of pages had to change.

  According to an advantageous development of the concept which is the basis of the invention, the tightening movement of the movable pulling roller against the strip is obtained by a relative movement between a base and a support plate mounted coaxially with respect to it, the movement relative can be prefixed by adjustable stops. The clamping movement can be imparted by a positioning element disposed between the support plate and the base and acting on flanges in which the

movable roller is rotatably mounted.

  In addition, by connecting the flange to a damping element acting in both directions, that is to say a double-acting damping element, one can suppress the creation of vibrations of the flange around its point d articulation on a lower extension of the support plate, so that when passing irregular places of the strip, the constant tension of the strip can be maintained and the creation of a vibration of the movable roller - caused by a place irregular tape - is avoided. Fluctuations in strip tension are most often related to fluctuations in the cutting accuracy of the strips by the pair of cutting cylinders. This results in fluctuations in the quality of the copies to be cut from the tape. As these disadvantages are

  avoided, maintaining a constant belt tension is guaranteed - even-

  when passing through irregular places, such as glued tape joints - this is essential for preserving high quality of the

product in the folder.

  The clamping force of the movable pulling roller against the strip is adjustable by a prestressing element - for example having the shape of a coil spring - so that the optimum clamping force can be adjusted each time, depending on the strip thickness, which can be

  consisting of one or more layers.

  The rotary mounting and mounting unit according to the invention is advantageously applicable for producing clamping movements and

  of a mobile pulling roller in suitable folding machines

  as in folding machines operating without sizes. In these two types of folding machines, the guarantee of a constant belt tension is decisive for obtaining a high product quality linked to a high

fidelity of the cutting location.

  The invention further provides a folder for processing strips, comprising a rotary mounting and mounting unit, in particular a unit like the one just described, making it possible to clamp a movable pulling roller against a mounted pulling roller. rotating at a fixed location or stationary roller, and spreading the pulling roller

  mobile of the stationary pulling roller, comprising means for positioning

  actuation for clamping the movable pulling roller laterally against the strip, as well as adjustable stops, carried by a plate

  support, to adjust the stroke of the movable pulling roller, which is charac-

  characterized in that a support plate, carrying a prestressing element and

  a damping element acting on a flange, is adjustable, co-

  axially with respect to a device forming a fixing of a base,

around this fixation.

  The invention will be described below in more detail with reference to a drawing, in which: - Figure 1 is a schematic side view showing in particular two pairs of pulling rollers located one behind the other in the direction d 'advancement or scrolling of the strip in the entry area before the cylinder part of a folder; - Figure 2 is an enlarged side view of a rotary mounting and mounting unit for a movable pulling roller; - Figure 3 is a perspective view of the unit according to Figure 2; and - Figures 4.1 and 4.2 respectively show the spread position and the clamped position of a mobile pulling roller supported rotatably in a

unit according to the invention.

  FIG. 1 represents a side wall 2 of a folder 1 in which a strip 3 enters in its direction of travel 4. The strip 3 passes through a first pair of pull rollers 5 composed of a pull roll 8 mounted stationary, that is to say rotatably mounted at a fixed location, and a movable pulling roller 10. The strip 3 passes more precisely through the gap formed between the lateral surfaces 9 and 10 of the rollers 8 and 10 and is thus transported, since the two pairs of pulling rollers 5 and 7 visible in Figure 1 are each driven, in the cylinder part - which is not shown in detail here and is provided with a drive 12 - of the folder 1 After passing through the first pair of pulling rollers 5 located at the top, the strip 3, formed of a single layer or of several layers, passes through a pair of perforating rollers 6 in which the strip 3

  can be perforated, either along the back of the first transverse fold, or trans-

  versally to the direction 4 of travel of the strip, according to the application.

  The strip 3 then arrives in another, lower pair of pulling rollers 7 which is of construction similar to the first pair 5. The only difference is that the movable roller 10 of the first pair 5 is hinged up on the unit support and rotary mounting, while in the lower pair 7, the movable roller is hinged down on the support unit. Figure 2 is a side view of a support and rotary mounting unit according to the invention, allowing the clamping and spacing of a roller

mobile draw.

  The two rollers 8 and 10, turning according to the arrows 13 in the

  direction 4 of movement of the strip, transport a strip 3 downwards.

  The movable roller 10 is received by each of its pins 14 in the eye of a flange 15, see also Figure 3. The flange 15 is itself mounted tilting, by its lower point of articulation 17, on an extension 19

  of the support plate 20. On the other side of the flange, a damping element

  Segment 42 is articulated at the upper articulation point 16 on the flange 15 and is supported by its other end on the support plate 20 of the support unit. An articulation point 18 for a prestressing element 35 is

additionally formed on the flange 15.

  A base 34 is fixed on a device forming a binding 21 and which can be produced for example as an axis extending from one side wall 2 to the other of the folder 1, with the interposition of a pad 23. -This has a slot 22 through which extends a clamping screw 24 by which the base 34 is blocked and immobilized in rotation on the fastener 21, produced here preferably in the form of an axis. On the base 34, stationary mounted on the axis forming the attachment 21, there is a stop 31 which, in the example shown, is screwed completely into a threaded hole of the base 34. In the upper part of the latter, there is in addition a stop face 33 coordinated with a stop 30 carried by the support plate

  22. In addition, a positioning member 26 for clamping and spreading

  ment of the movable roller is articulated at point 27 on the base 34 and its positioning rod or piston rod 28 is connected to the support plate 20, which is movable relative to the base 34. It appears from the above and from the drawing that the positioning element 26 is disposed between the support plate 19, 20 and the base 34, that the clamping stroke of the movable roller can be fixed by the stops 30, 31 determining the relative movement between the support plate 19, 20 and the base 34 and that the flange 15 can be tilted around the point of articulation 17 on the support plate 19, 20 by

  activation of the positioning element 26.

  The movable support plate 20, including its extension 19, is also carried by the axis forming the attachment 21, but it can tilt

  around this axis, unlike the base 34. Next to the positioning member

  actuation 26 for clamping and spacing the movable pulling roller 10, a bar 29 is fixed to the support plate 20. This bar is used on the one hand for the reception of the adjustable stop 30 and on the other hand, by its end directed towards the movable roller 10, abutment for the abutment element 31 already mentioned and contained in the base 34. The bar 29 is fixed to the support plate 20 by screws 32. In the upper part of the support plate 20 , a stud 25 is fixed with the aid of which the parallelism of the support plates 20 located one opposite the other can be monitored.

  the side walls 2 of the folder 1.

  On the upper part of the support plate 20 are also mounted a damping element 42 which permanently urges the flange 15 and acts in both directions, that of the tightening and that of the spacing, thus

  that a prestressing element 35 in the form of a compression spring

  beaded sion received between two adjustable stops 36. This spring is guided on a rod 39 which passes through it. The mutual spacing of the stops makes it possible to reduce the spring force and, consequently, the prestressing force, while

  bringing them together increases this strength.

  We see in the perspective view of Figure 3 that the rod 39 is carried by the flange 15 via a pin 37 held in place by a stop segment 38. Under the preload element 35, the support plate 20 carries the stud 25 and, further down, the bar 29 on which the two stops 30 and 31 are provided, limiting the travel of

  positioning of the support plate 20 relative to the base 34.

  Figures 4.1 and 4.2 show the two essential positions 40

  and 41 of the movable pulling roller 10.

  According to Figure 4.1, showing the separated position of the movable roller 10, the piston rod 28, articulated on an upper end of the support plate 20, is retracted into the positioning element 26. The support plate 20 has thus been tilted in a small measurement, together with the flange 15 supported at the point of articulation 17, around the axis forming the attachment 21, which created the distance represented between the lateral surface 11 of the movable roller 10 and the strip 3. This stroke spacing is limited by the adjustable stop 30 which, at this separated position 40, is applied against the stop face 33 provided on the base 34. The upward movement of the stop 30 will produce a more accentuated rotation in the direction of

  the spacing of the side wall 11 of the roller 10 relative to the strip 3.

  Figure 4.2 shows the clamping state or position 41 of the roller

mobile 10 against band 3.

  In this clamped position 41, the positioning rod or piston rod 28 is extended further out of the positioning element 26. The support plate 20 has therefore been tilted around the axis 21, until the bar 29 almost touches the head of the stop element 31. Contact with the strip 3 is produced by the prestressing element 35 which presses the flange 15, causing it to tilt around its point of articulation 17, against the pulling roller 8, rotatably mounted in a stationary location, with interposition of the strip 3. The damping element 42, articulated at the top on the flange 15, prevents, during the passage of irregular places of the strip - as by example of the glued connections of the strip - the creation of a vibration on the roller 10 mounted rocking around its point of articulation 17 on the extension 19 of the support plate 20. It follows that in the tightened state of the movable pulling roller 10 according to position 41 of F igure 4.2, even the shortest distance of this roller from the belt 3 is prevented, so that fluctuations in the belt tension cannot occur. The rotary mounting and mounting unit according to the invention, described in the foregoing, is therefore

  advantageously applicable both in suitable folding machines

  and in folders operating without sizes, both for

  printing newspapers only for printing city works.

Claims (10)

  1. Support and rotary mounting unit for clamping a movable pulling roller (10) against a clamping roller (8) rotatably mounted at a fixed location or stationary roller, and to spread the movable pulling roller (10) stationary pulling roller (8), unit which includes positioning means (26) for clamping the movable pulling roller (10) laterally against the strip (3), as well as adjustable stops (30, 31), carried by a support plate (20), for adjusting the stroke of the movable pulling roller (10), characterized in that a support plate (19, 20), carrying a prestressing element (35) and a damping element ( 42) acting on a flange (15), is adjustable, coaxially with respect to a device forming a fixing (21) of a base   (34), around this attachment (21).   2. Unit according to claim 1, characterized in that the clamping stroke of the movable pulling roller (10) can be prefixed by stops (30, 31) determining the relative movement between the support plate (19, 20) and the base (34).   3. Unit according to claim 1, characterized in that the support plate (19, 20) is movable relative to the base (34) around the fixing (21).   4. Unit according to claim 3, characterized in that a positioning element (26) is disposed between the support plate (19, 20) and the base (34). 5. Unit according to claim 1, characterized in that the flange (15) can be tilted around a point of articulation (17) on the plate   support (19, 20) by activating the positioning element (26).   6. Unit according to claim 1, characterized in that the damping element (42), carried by the support plate (19, 20), acts in permanently on the flange (15).   7. Unit according to claim 1, characterized in that a spring is arranged as a prestressing element (35) between the flange (15) and the support plate (19, 20).   8. Unit according to claim 2, characterized in that the prestressing force of the prestressing element (35) is variable by stops adjustable (36).   9. Unit according to claim 6, characterized in that the damping element (42) is a damping element acting in the both directions.   10. Folding machine for strip processing (3), comprising a unit for   rotary support and mounting, in particular according to one of claims 1 to   9, making it possible to clamp a movable pulling roller (10) against a pulling roller (8) rotatably mounted at a fixed location or stationary roller,   and move the movable pull roller (10) away from the stationary pull roller   nary (8), comprising positioning means (26) for clamping the movable pulling roller (10) laterally against the strip (3), as well as adjustable stops (30, 31), carried by a support plate (20 ), to adjust the stroke of the movable pulling roller (10), characterized in that a support plate (19, 20), carrying a prestressing element (35) and a damping element (42) acting on a flange (15), is adjustable, coaxially with respect to a device forming a fixing (21)   a base (34), around this fixing (21).