EP0508040A1 - Device for receiving and delivering sheets - Google Patents

Abstract

A device for the trouble-free acceptance and delivery of sheets (3, 39) has guide rollers (13; 14; 15) arranged on a carriage (11) and engaging in strips (17; 26), which guide the geometry of the strips (17, 26 ) change when the carriage (11) is moved on a rail (8) above the stack (1) by means of a drive (35). Upon acceptance or delivery, the sheet (3) to be stacked or a cover sheet (39) to be dispensed rolls without sliding around one of the outer guide rollers (13; 15) on the stack (1). Rotatable suction rolls are arranged between the outer guide rolls (13; 15) of a roll axis, the suction cups of which suck the cover sheet (39) at the beginning of an output cycle by means of negative pressure. A control device (34) is set up to trigger acceptance and output cycles of the device and determines predetermined positions of the carriage (11) on the rail (8). <IMAGE>

Description

The invention relates to a device for accepting and issuing sheets of the type mentioned in the preamble of claim 1.

Such devices for accepting and issuing sheets are suitable, for example, for service machines in which banknotes are taken in or handed out.

A service machine for accepting or issuing larger amounts of money, which is suitable for the cash business of banks, is e.g. B. known from German patent DE-PS 35 19 635. Banknotes sorted by face value are stacked in buffers until they are issued to a customer. The top of these stacks of banknotes are fed by means of the quantities of banknotes paid in by the customers, while the bottom banknote of the predetermined stack of banknotes is drawn out by means of a friction wheel during the output.

Furthermore, a separating device is known from DE-OS 27 51 422, which shows the use of negative pressure for lifting individual banknotes from the stack of banknotes. One end of the top banknote of the stack of banknotes is held under a retaining plate. The other end of the uppermost banknote is located directly under a suction roller with a shaft arranged fixedly above the stack, which lifts the banknote at a predetermined time by means of negative pressure, a single banknote being pulled out from under the retaining plate by rotating the suction roller and a transport system is fed.

With such devices, the mechanical stress on the banknotes is high, which requires high values of their mechanical strength. In the case of heavily used bank notes, this value drops below a permissible limit value, so that such bank notes can cause mechanical faults in the device.

In Swiss patent application no. 02 566 / 90-1 describes a device for stacking sheets, in which a carriage which can be moved over at least one stack changes the geometry of conveyor belts by means of guide rollers in order to deposit the sheet on the stack without the conveyor belts or the sheet to be deposited on the previous cover sheet of the stack slides. This enables sheets from a wide range of mechanical strength values to be processed without any problems. Depending on the time synchronization of the sheet feed to the device and the movement of the carriage, the sheet can be deposited in a predetermined manner on one of several stacks lying next to one another and covered by the carriage.

The invention has for its object to provide a simple and inexpensive device for accepting and issuing sheets, in which both the depositing and the lifting of the sheets on the top of a stack and in which the mechanical stress on the sheets is minimal.

The invention consists in the features specified in the characterizing part of claim 1. Advantageous refinements result from the dependent claims.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Figur 1

eine Vorrichtung zur Annahme und Ausgabe von Blättern,

Figur 2

einen Wagen mit Ablenkern beim Ablegen,

Figur 3

eine Saugwalze zwischen Führungsrollen,

Figur 4a

der Wagen vor dem Anheben eines Deckblatts,

Figur 4b

das Deckblatt beim Einfädeln in eine Transportebene,

Figur 5

einen Stapel mit Versatzstrecken und

Figur 6

eine Verwendung der Vorrichtung.

It shows:

Figure 1

a device for accepting and issuing sheets,

Figure 2

a cart with diversions when putting it down,

Figure 3

a suction roller between guide rollers,

Figure 4a

the carriage before lifting a cover sheet,

Figure 4b

the cover sheet when threading into a transport level,

Figure 5

a stack of offset lines and

Figure 6

use of the device.

In FIG. 1, 1 means a stack, 2 a plate and 3 sheets which are stacked on plate 2 and form stack 1. Springs 4 press the stack 1 against the stack 1 against a stack plane 5 delimiting the stack 1, the position of which is predetermined by fixed points 6 and 7 lying outside the stack 1.

Above the stacking level 5, a rail 8 is arranged in parallel for a carriage 11 which can be displaced on it between end positions 9 and 10. The end positions 9 and 10 lie outside the area of the stack 1. The carriage 11 carries three guide rollers 13 to 15 next to one another in a band plane 12, which coincides with the plane of the drawing in the illustration. The two outer guide rollers 13 and 15 touch with their circumference on the one hand the stack plane 5 and, on the other hand, a transport plane 16 parallel thereto, both planes 5 and 16 intersecting the belt plane 12.

A band 17 of a predetermined length is fastened in the plane of the band 12 with its two ends 18 and 19 at the fixed points 6 and 7. Each end 18 or 19 is stretched in the stacking plane 5 from the fixed point 6 or 7 to the closest outer guide roller 13 or 15, looped in a semicircle around the guide roller 13 or 15 and in the transport plane 16 via the fixed point 6 or 7 also led to a deflection roller 20 or 21. The band 17 connects the two ends 18 and 19 via further deflection rollers 22, 23. In the drawing, part of the band 17, which is located between the deflection rollers 20 and 21, is shown in broken lines, since this part of the band 17 and the further deflection rollers 22, 23 can also be arranged outside the band plane 12.

In the belt plane 12, two end rollers 24 and 25 and the middle guide roller 14 span an endless belt 26 which rests on the belt 17 in the transport plane 16 between the end roller 24 or 25 and the outer guide roller 13 or 15. Between the two outer guide rollers 13 and 15, the endless belt 26 is lowered from the transport plane 16 to the stacking plane 5 by means of the middle guide roller 14, a predetermined distance from the stacking plane 5 being maintained.

The axes of the rollers 20 to 25 are arranged rigidly. The axes of the deflection roller 20 or 21 and the end roller 24 or 25 define an input plane 27 or 28 perpendicular to the belt plane 12. When the carriage 11 is moved out of the end positions 9 and 10, the belts 17, 26 grip the sheet 3 fed through the entrance plane 27 and 28 and convey it, clamped between the belts 17, 26, in the transport plane 16 against the carriage 11.

The carriage 11, the belts 17 and 26 and the associated rollers 13 to 15 and 20 to 25 form a transport system 29. Gates 30 and 31 delimit it on opposite sides outside the entrance levels 27 and 28 in the transport level 16. Between the first gate 30 and the first input level 27 is a first sensor 32, e.g. B. a light barrier arranged to determine the presence of the sheet 3 in the first gate 30. A second sensor 33 is located between the second gate 31 and the second entrance level 28. Each sensor 32 or 33 is connected by a line to a control device 34 which controls a drive 35 of the transport system 29. The drive 35 advantageously contains a stepper motor 35 ', since the control device can calculate the respective position of the carriage 11 on the rail 8 by counting the steps covered by the drive 35.

The working methods of the transport system 29, which are under the control of the control device 34, comprise an acceptance and an output cycle as well as empty runs in both directions between the end positions 9 and 10. This is an empty run Moving the carriage 11 denotes when no sheet 3 is conveyed out of or into the transport plane 16. Upon an external command, the control device 34 begins to process the predetermined cycle, while the control device 34 triggers empty runs at the beginning of the cycle according to a self-determined need.

Along the rail 8 z. B. two connected via lines to the control device 34 sensors 37 and 38, z. B. light barriers, the sensor signals are triggered by the carriage 11 when driving past. The position of the sensors 37, 38 along the rail 8 is predetermined by the stack 1. The first sensor 37 sends the control device 34 the sensor signal when the carriage 11 rolls in a direction 36 with the second outer guide roller 15 over the front edge of a cover sheet 39 of the stack 1 facing the first end position 9. The control device 34 receives the signal from the second sensor 38 at which the carriage 11 rolls over the rear edge of the cover sheet 39 facing the second end position 10 in a travel opposite to the direction 36 with the first outer guide roller 13.

The control device 34 controls the drive 35 of the transport system 29 in a predetermined manner in dependence on the signals from the sensors 32, 33 and the sensors 37, 38. For example, the first sensor 32 detects the presence of the front edge of the sheet 3 transported against the carriage 11 and transmits a sensor signal to the control device 34, which switches on the drive 35 in a predetermined manner. In this case, the drive 35 sets the endless belt 26 in counterclockwise motion. Frictional forces in the transport plane 16 transmit the movement of the endless belt 26 to the belt 17, the carriage 11 waiting in the first end position 9 being accelerated in the direction 36 towards the second end position 10. The belts 17 and 26 convey the sheet 3 detected in the input plane 27 in the direction 36 at twice the speed of the carriage 11. When the first guide roller 13 arrives, the sheet 3 is nestled with its leading edge onto the belt 17 by 180 ° from the Transport level 16 deflected into the stacking level 5.

For example, these sheets can have 3 different predetermined sizes, such as banknotes from a predetermined set of nominal values. A sheet length measured in the direction 36, which can be deposited on the stack 1 by the device, depends only on the length of the rail 8 available for depositing. A sheet width measured transversely to the direction 36 must be at least so wide that the sheet 3 is guided in at least two band planes 12 by means of the bands 17 and 26. The sheets 3 can be transported with their largest dimension both transversely and longitudinally to the direction 36 of the belts 17 and 26.

After the acceptance cycle has been triggered by the external acceptance command, the carriage 11 moves to the end position 9 or 10 and waits there until the sensor signal from the sensor 32 or 33 arrives in the control device 34. The carriage 11 sets off to the other end point 10 or 9. The first end position 9 on the rail 8 is predetermined such that, as shown in the drawing in FIG. 2, the leading edge of the sheet 3 after deflecting into the stacking level 5 is flush with an edge of the first input level 27 (FIG. 1) Stack 1 is placed. As the carriage 11 moves in the direction 36, the sheet 3 is rolled around the first outer guide roller 13 without sliding as a new cover sheet 39 onto the stack 1, the position of the front and back of the sheet 3 being interchanged when stacked. The acceptance cycle ends with the arrival of the car at the other end point 10 or 9 (FIG. 1).

A deflector 40, which is arranged on the carriage 11 between the outer guide roller 13 or 15 and the middle guide roller 14, guides the sheet 3 in contact with the belt 17 from the transport plane 16 around the outer guide roller 13 into the stacking plane 5 and guides it also relatively stiff or very soft sheets 3 safely on the stack 1, where they are stored without folds in the predetermined position when the carriage 11 is in the second end position 10.

When the sheet 3 is inserted through the gate 31 (FIG. 1) into the transport plane 16 and the sensor signal from the sensor 33 (FIG. 1) is triggered, the carriage 11 moves from the second end position 10 to the end position 9. The sheet 3 becomes in order to roll the second outer guide roller 15 onto the stack 1 without sliding as a new cover sheet 39, the front edge of the new cover sheet 39 being placed flush on the edge of the stack 1 closer to the gate 31.

The design of the outer guide rollers 13 and 15, which is advantageous for a reliable delivery of the cover sheet 39, is shown in FIG. 3 using the example of the guide roller 15. A common roller axis 41 carries at least one guide roller 15 and one suction roller 42 of at most the same diameter as the guide roller 15. For example, two guide rollers 15 are spaced apart by the suction roller 42, which are rotatably mounted on the roller axis 41. A clutch 42 ′ is arranged between at least one of the outer guide rollers 15 and the suction roller 42, which clutch transmits the rotational movement of the outer guide roller 15 to the suction roller 42 in a predetermined manner.

The suction roller 42 has on a surface line a number of suction cups 43 made of a soft elastic material. Each suction cup 43 is seated in a radial bore 44 in the suction roller 42 and, with its edge on the suction surface, projects only a few tenths of a millimeter above the surface of the suction roller 42. The air in the suction cup 43 can be drawn off through the bore 44 or through the bore 44 by means of ventilation are fed. If a plurality of suction rolls 42 are lined up on the same roll axis 41, the suction cups 43 are arranged on the surface line common to the suction rolls 42. The suction rollers 42 of the same roller axis 41 are coupled to one another so that the orientation of the suction cups 43 is maintained.

All suction cups 43 of the surface line are connected to a pump 46 via a suction line 45. The suction line 45 has a control valve 47 which, in one position, pumps the 46 Drain connects to the suction line 45 and in the other position ventilates the suction line 45. A signal line connects the control device 34 to the control valve 47, which is switched to a command from the control device 34 between its two positions, emptying and venting. The first sensor 37 (Figure 1) triggers the switching of the control valve 47 for the second guide roller 15, the second sensor 38 (Figure 1) that of the control valve 47 for the first outer guide roller 13 (Figure 1).

Each of the two outer guide rollers 13 and 15 is therefore assigned at least one suction cup 43 which sucks the cover sheet 39 at the beginning of the dispensing cycle by means of negative pressure. In a simple embodiment, the suction cup 43 can be used alone without the suction roller 42. It is directed radially outwards and is connected to the guide roller 13 or 15 in such a way that it projects somewhat beyond the elongated cylindrical surface of the guide roller 13 or 15. The suction cup 43 can also follow the guide roller 13 or 15 only at the rotation angle of approximately 135 ° of the guide roller 13 or 15 which is necessary for receiving the cover sheet 39.

A boiler 48 switched on between the pump 46 and the control valve 47 increases the speed of emptying and serves as a branch to the control valve 45 of the suction roller 42 for the first outer guide roller 13.

The suction roller 42 rotates, for example, together with the guide roller 15 or 13 constantly in firm engagement with the belt 17, so that the radial alignment of the suction cups 43 is a function of that covered by the carriage 11 (FIG. 1) on the rail 8 (FIG. 1) Way is.

The outer output command initiates the output cycle. For example, in FIG. 4 a, the carriage 11 travels in the direction 36 against the stack 1 after the carriage 11 has returned to the first end position 9 (FIG. 1) in an empty run.

FIG. 4a shows the guide roller 15 immediately after the front edge of the cover sheet 39 has been rolled over. As soon as the carriage 11 with the second guide roller 15 passes over the front edge of the cover sheet 39 in the direction 36, the first sensor 37 (FIG. 1) releases the suction of the air in the suction line 45 and in the suction cups 43 when the carriage 11 starts to travel an intake section A in the direction 36.

The suction roller 42 is aligned with the stack 1 such that after the front edge of the cover sheet 39 has been rolled over, the suction cups 43 always lie flat on the front end of the cover sheet 39 with their edges on the suction surface. During suction, a vacuum is created in the suction cups 43, as a result of which the front end of the cover sheet 39 is lifted off the stack 1 by the external air pressure and nestled against the suction roll 42.

When the carriage 11 continues on the suction path A, the suction roller 42 continues to rotate clockwise and, as can be seen from FIG. 4b, rolls the front end of the cover sheet 39 - nestled around the suction roller 42 and the belt 17 - from the stack 1 and introduces the rolled front end of the cover sheet 39 between the belt 17 and the endless belt 26.

After rotating the suction roll 42 clockwise through an angle of rotation of at least 135 °, i. H. as soon as the front end of the cover sheet 39 is gripped by the bands 17 and 26, the suction line 45 is ventilated again and the cover sheet 39 is released by the suction cups 43. The ventilation can be triggered by a timer in the control device 34 (FIG. 3) or advantageously independently of the time by means for determining the position of the carriage 11, for example by the sensors 37 or 38 (FIG. 1) after the carriage 11 has passed through it Rotation angle of the suction roller 42 has covered predetermined suction path A.

Since the carriage 11 continues in the direction 36, the received cover sheet 39 rolls around the guide rollers 15 from the stack 1 into the transport plane 16 without the cover sheet 39 sliding on the stack 1. The cover sheet 39 leads the carriage 11 at twice the carriage speed in the direction 36 until it is discharged from the transport system 29 (FIG. 1) through the second gate 31 (FIG. 1). The sensor signal from the second sensor 33 (FIG. 1) ends the output cycle.

The cover sheet 39 can also on the journey of the carriage 11 from the second end point 10 (Figure 1), i. H. opposite direction 36, through the first gate 30 (Figure 1). The suction cups 43 of the suction roller 42 between the first guide rollers 13 (FIG. 1) are aligned flat on the rear end of the cover sheet 39 as soon as the guide roller 13 has rolled over the rear edge of the cover sheet 39 and the sensor signal of the second sensor 38 (FIG. 1) is triggered . The rear end of the cover sheet 39 is nestled around the guide rollers 13, rolled counterclockwise from the stack 1 and inserted between the belts 17 and 26. The sensor signal of the first sensor 32 (FIG. 1) ends this output cycle.

The device described has the advantage that the sheet 3 is guided frictionally between the belts 17 and 26 when it is received and output in the transport system 29 and any sliding movement which can damage the sheets 3 or the device is blocked is avoided. The advantage of the rolling movement of the firmly guided sheet 3 on the stack 1 lies in the trouble-free processing of the sheets 3 with very different characteristics, as is observed, for example, between new and widely used bank notes.

For further designs of the transport system 29 and the control device 34, reference is expressly made to the Swiss patent application no. 02 566 / 90-1.

In FIG. 5, the control device 34 has a counter 49, the level of which corresponds to the number of sheets 3 stacked on the plate 2 in the stack 1. At the beginning of each external triggered acceptance cycle ', the control device 34 reads the status of the counter 49 and determines in a computing unit 34' whether the number of sheets 3, 39 on the stack 1 is odd or even.

The stack 1 has a front boundary 50 and a rear boundary 51, viewed in the direction 36. The boundaries 50 and 51 can be walls of a transportable cassette 52, which is used to replace the stack 1, the width W between the boundaries 50, 51 of the cassette 52 advantageously being greater than the length of the sheets 3 measured in the direction 36, 39, so that the stack 1 can advantageously be layered with an order predetermined for a quick and safe delivery of sheets 3, 39. In the drawing in FIG. 5, the uppermost sheets 3, 39 are drawn separately for illustrative reasons; in reality, the offset sheets 3, 39 lie on top of one another on the common path.

The sensor 37 is, for. B. below the rail 8 (Figure 1) and is connected by means of a signal line 53 to the control device 34. The signal line 53 is not drawn all the way to the control device 34.

For example, the odd-numbered sheets 3 counted from the plate 2 are arranged with their front edge flush with the front boundary 50, while the even-numbered leaves end with their rear edge directly at the rear boundary 51. Successive layers are offset from one another, the even-numbered leaves 3, 39 being a predetermined first offset distance L from the front boundary 50 and the odd-numbered leaves by a predetermined second offset distance K from the rear boundary 51. If all sheets 3, 39 are of equal length, the two offset sections L and K are of equal size.

The position of the cover sheet 39 deposited on the stack 1 depends only on the location of the carriage 11 on the rail 8, which the carriage 11 at the moment the cover sheet is recorded as the current cover sheet 39 serving sheet 3 by the belts 17 and 26 in the entrance plane 27 (Figure 1) and 28 (Figure 1). After the acceptance command to initiate the acceptance cycle, the control device 34 waits for the arrival of a sheet 3 in one of the two gates 30 and 31 (FIG. 1).

In a second step of the acceptance cycle, the control device 34 calculates the position of the carriage 11 predetermined for the correct position of the future cover sheet 39 from the status of the counter 49 and the entrance level 27 or 28 used by the sheet 3 and controls the carriage 11 by means of the drive 35 there before the sheet 3 is gripped by the belts 17 and 26. If the drive 35 has the stepper motor 35 ', the instantaneous position of the carriage 11 on the rail 8 can be determined from the number of steps for the control device 34. After complete rolling of the new cover sheet 39 in its predetermined position on the stack 1, the control device 34 increases the level of the counter 49 by 1 and completes the acceptance cycle.

At the beginning of the dispensing cycle, the direction of travel of the carriage 11 while the cover sheet 39 is being dispensed is determined in a predetermined manner from the status of the counter 49 in the control device 34, the direction of travel of the carriage 11 depending on the assignment selected when accepting, which determines which sheets 3, 39 are stored with the offset distance L.

In the drawing in FIG. 5, the cover sheet 39 is the sixth, ie even-numbered sheet 3 of the stack 1, for example. If necessary, the carriage 11 first returns to the first end position 9 (FIG. 1) in an empty run. From there its journey begins in the direction 36, moves over the offset distance L and triggers the signal necessary to open the control valve 47 (FIG. 3) when the sensor 37 passes over the front edge of the cover sheet 39.

The carriage 11 advantageously has a sliding block 54 between the two outer guide rollers 13 and 15, the one on both The end of the curved sliding surface 55 is arranged in the stacking plane 5. The sliding surface 55 slides in the stack plane 5 over the stack 1 and prevents contact between the endless belt 26 and the stack 1 as long as the carriage 11 is above the stack 1. The sliding surface 55 extends in the stacking plane 5 symmetrically to the axis of the central guide roller 14. The length of the sliding surface 55 corresponds, for example, to the diameter of the central guide roller 14. The two gaps between the ends of the sliding block 54 and the lines of contact of the outer guide rollers 13, 15 the stacking level 5 determine a minimum necessary length of the offset distance L.

When the cover sheet 39 is lifted off with the suction cups 43, the slide shoe 54 is located on the offset distance L of the sheet 3 lying directly below the cover sheet 39 and prevents the unintentional simultaneous picking up of a second sheet 3 Lifting off the cover sheet 39 from the exactly aligned stack 1 also occurs when the sheets 3 are intact.

The sliding shoe 54 can also be combined with the deflectors 40 (FIG. 2). Instead of the slide shoe 54, rotatably mounted rollers can also be used here, the axes of which are arranged parallel to the roller axes 41 and the rollers of which roll in the stacking plane 5.

The control device 34 receives the sensor signal from the sensor 32 (FIG. 1) or 33 (FIG. 1) as soon as the sheet 3 has left the device. The counter 49 is decremented by 1 and the dispensing cycle is ended.

Instead of the sensors 37, 38, the carriage 11 can have a rotary encoder 56 connected to the control device 34 via a line, which, for example, reads every movement of one of the guide rollers 13 to 15 or the carriage 11 and which transmits a numerical value to the control device 34 at any time, which corresponds to the exact position of the carriage 11 on the rail 8. The encoder 56 can also with the belt 17 or the endless belt 26 or be directly coupled to the drive 35.

The control device 34 determines by means of a simple numerical comparison between the instantaneous numerical value of the rotary encoder 56 or the instantaneous number of steps of the drive 35 and one of the desired positions of the carriage 11 and, if they match, generates a signal which corresponds to the corresponding sensor signal of the sensor 37 or 38 . The advantage of this arrangement is that when the predetermined set of blades 3 is changed, there is no need for precise mechanical alignment of the positions of the sensors 37 and 38.

The device is also suitable for processing sheets 3, 39 from a predetermined set of different sizes. The control device 34 advantageously has a data memory 57, into which it stores the information required when each sheet 3 is deposited, for example the sheet length or a code number corresponding to the length and the ordinal number of the sheets 3, 39 located in the stack 1. During output the information of the output cover sheet 39 is deleted, so that the data memory 57 always contains a current image of the stack 1.

When a new cover sheet 39 is placed on the stack 1, the control device is sent the sheet length of the sheet 3 together with the command to initiate the acceptance cycle. The control device 34 determines the new atomic number and stores the information. The carriage 11 is then moved on the rail 8 into the calculated target position. The new cover sheet 39 is rolled on the stack 1 in the manner described above. The offset distance L or K depends on the sheet length.

At the beginning of the dispensing cycle, the control device 34 calculates from the ordinal number and the sheet length, which are stored in the data memory 57 for the cover sheet 39, the predetermined target position of the carriage 11 for actuating the control valve 47 (FIG. 3), so that the predetermined end of the cover sheet 39 can be properly captured by the suction cups 43.

The suction cups 43 are advantageously arranged on several circumferential lines on the circumference of the suction rollers 42 (FIG. 3), so that at least the suction cups 43 of one of these circumferential lines have a position suitable for receiving the cover sheet 39 if the sheet lengths are different.

If the suction rollers 42 have only a single row of suction cups 43, the clutches 42 '(FIG. 3) of the guide rollers 13 or 15 can advantageously be controlled by the control device 34 by means of clutch signals and the suction rollers 42 of the guide rollers 13 or 15 with a reset device 58 or 59, with which, when the clutch 42 'is switched off, the suction cups 43 are aligned in a radial position favorable for receiving the cover sheet 39 from the stack 1, even at different offset distances L, K. The reset devices 58, 59 are arranged on the carriage 11 and can be controlled by the control device 34 via lines (not shown here).

The control device 34 triggers the function of the resets 58, 59 when, due to the current position of the moving carriage 11, the cover sheet 39 is imminent to be picked up. The reset device 58 or 59, which is assigned to the suction rollers 42 that advance in the direction of travel of the carriage 11, aligns the suction roller 42 with the suction cups 43 onto the stack 1 immediately before the control valve 47 (FIG. 3) is switched over. As soon as the negative pressure has reached the value required for receiving the cover sheet 39, the control device 34 switches on the clutch 42 ′ of the corresponding suction roller 42 via a line (not shown here). The clutch 42 'transmits the rotary movement of the guide rollers 13 and 15 to the suction rollers 42 until the cover sheet 39 sucked in by the suction cups 43 is inserted between the belts 17 and 26 and the suction cups 43 are aerated.

The negative pressure prevailing in the suction cups 43 advantageously directly actuates the clutch 42 ', so that the required ones Circuits in the control device 34 are unnecessary and the control device 34 is therefore easier to design.

An application of the device in FIG. 6 has a conveying means for sheets 3 (FIG. 1) which comprises a feed section 60 and a switch 61 with branch lines 62 and 63. In the switch 61, the feed section 60 bifurcates into the two branch lines 62 and 63, which extend to the two gates 30 and 31 of the transport system 29. The conveying means 60 to 63 transports the sheets 3 in both directions, for example from a test device (not shown here) via the switch 61 to the gate 30 or 31 or from the gate 30 or 31 via the switch 61 into the feed path 60 Service machine has a control device 64, which is connected via a control line 65 to the switch 61 and a drive means of the means of transport 60 to 63, not shown here. The control device 64 supplies signals for controlling the switch 61 and the means of transport 60 to 63. An exchange line 66 takes over the transfer of data in both directions between the control device 34 and the control device 64 in order to ensure that the sheets 3 are transported properly in the transport system 29 and in the means of transport To ensure 60 to 63.

The control device 64 converts signals from the test device as a function of information about the cover sheet 39 in the cassette 52 into a control command for the feed section 60 and for the switch 61 and transmits this to the means of transport 60 to 63 via the control line 65. Received by means of the data exchange line 66 the control device 34 the command that triggers the acceptance cycle together with the information about the branch line 62 or 63 predetermined for the delivery of the next sheet 3 and about the dimension of this sheet 3.

If the machine needs a sheet 3 from the cassette 52, the control device 64 transmits the control device 34 the command to initiate the dispensing cycle. The control device 34 then informs the control device 64 of the Cover page 39 to be issued so that the control device 64 can issue the necessary means for the transport of the cover page 39 to the means of transport 60 to 63 and other parts of the machine not mentioned here.

Claims (11)

Device for receiving and delivering sheets (3, 39) consisting of a transport system (29) formed by belts (17; 26) and delimited by two gates (30; 31), which is arranged above a stack (1), the Stack (1) is pressed against the belt (17) as the upper limit, with a carriage (11) which can be moved over the stack (1) on a rail (8) by means of a drive (35) and which runs into the belts (17; 26 ) engaging guide rollers (13; 14; 15), and from a control device (34) which, in the interaction of the drive (35) and the transport system (29), for the non-sliding rolling around the rear, viewed in the direction of travel of the carriage (11), The outer guide roller (13 or 15) of the sheet (3) intended for acceptance is set up on the stack (1), the sheet (1) passing through a gate (30 or 31) to the carriage (11) in its direction of travel lags and is deposited as a new cover sheet (39) on the stack (1), characterized in that the tax device (34) for triggering acceptance and delivery cycles of the transport system (29) is set up so that each of the two outer guide rollers (13 or 15) is assigned at least one suction cup (43) which, at the start of the delivery cycle, uses vacuum to cover the cover sheet ( 39) sucks that the transport system (29) means (35 '; 37, 38; 56) for determining predetermined positions of the carriage (11) on the rail (8), that the control device (34) in the dispensing cycle for detecting a position of the carriage (11) suitable for sucking in the cover sheet (39) and for generating the negative pressure in the suction cups (43) is set up by actuating a control valve (47) and that in the dispensing cycle while the carriage (11) is traveling over the stack (1), the cover sheet (39) is rolled off the stack (1) without sliding and the cover sheet is output (39) through one of the gates (30; 31). Apparatus according to claim 1, characterized in that between the outer guide rollers (13 or 15) of a same roller axis (41) with the outer guide rollers (13; 15) rotatable suction rollers (42) are arranged that the suction rollers (42) on at least one surface line are equipped with the suction cups (43) directed radially outwards and that the suction cups (43) assigned to the same roller axis (41) are connected to one another by means of lines (44, 45). Apparatus according to claim 1 or 2, characterized in that the control device (34) for counting the sheets (3, 39) stacked in the stack (1) is set up by means of a counter (49), the level of which is increased by 1 in each acceptance cycle and in is reduced by 1 each dispensing cycle, and that the carriage (11) has a predetermined target position calculated by the control device (34) from the status of the counter (49) at the beginning of each acceptance or dispensing cycle. Device according to one of Claims 1 to 3, characterized in that the control device (34) has a data store (57) for storing information about each of the sheets (3, 39) piled up in the stack (1) and in that the data store (57) contains a current image of the stack (1). Device according to claim 3, characterized in that the control device (34) is set up for layering the stack (1) with staggered sheets (3, 39) and that a cassette (52) for receiving the staggered stack (1) is sufficient Width (W). Device according to claim 5, characterized in that the carriage (11) has a slide shoe (54) for holding down the exposed end of the sheet (3) lying under the cover sheet (39) and in that the slide shoe (54) between the two outer guide rollers ( 13; 15) is arranged below a middle guide roller (14) with its sliding surface (55) in a stacking plane (5). Device according to one of claims 1 to 3, characterized in that the control device (34) for determining the position of the carriage (11) is connected to a rotary encoder (56) which transmits a numerical value corresponding to the position of the carriage (11) to the control device (34) and is coupled to the drive (35), and that the control device (34) for comparing numbers between the position of the carriage (11) and one of the desired positions the carriage (11) is set up. Device according to one of claims 1 to 3, characterized in that the drive (35) has a stepper motor (35 ') and that the control device (34) for determining the exact position of the carriage (11) from the distance traveled by the drive (35) Number of steps and a number comparison between the position of the carriage (11) and one of the target positions of the carriage (11) is set up. Device according to one of claims 1 to 8, characterized in that the suction cups (43) are arranged on the circumference of the suction rolls (42) on a plurality of surface lines, so that at least the suction cups (43) of one of the surface lines one for receiving the cover sheet (39) have a favorable position from the stack (1). Device according to one of Claims 1 to 8, characterized in that at least one clutch (42 ') which can be actuated by the control device (34) is arranged on the same roller axis (41) between the suction rollers (42) and the guide rollers (13 or 15) and that the carriage (11) has resets (58; 59), which are assigned to the roller axes (41) and can be actuated by the control device (34), for aligning the suction rollers (42) with the stack (1), the resetting means (58 or 59) aligns the suction roller (42) assigned to it and rotates the suction cups (43) into a position which is favorable for receiving the cover sheet (39) from the stack (1). Device according to one of claims 1 to 7, characterized in that between the suction rollers (42) and the guide rollers (13; 15) on the same roller axis (41) at least one coupling (42 ') which can be actuated by the negative pressure in the suction line (45) is arranged and that the Carriage (11) assigned to the roller axles (41), which can be actuated by the control device (34), reset means (58; 59) for aligning the suction rollers (42) on the stack (1), the reset means (58 and 59) respectively aligns the assigned suction roller (42) and rotates the suction cups (43) into a position which is favorable for receiving the cover sheet (39) from the stack (1).

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