EP0626331A2 - Method and device for exactly separating the main stack from the auxiliary stack in continuous pilers of sheet printing machines - Google Patents

Abstract

The invention relates to a method and a device for exactly separating a main stack from an auxiliary stack in continuous deliveries of sheet-processing printing machines. The object on which the invention is based is to develop a solution which guarantees the exact separation of the main and auxiliary stacks and which prevents sheets from slipping back in the direction of the sheet ascent during the depositing operation. Furthermore, spearing actions caused by holding-up devices are to be avoided. This is achieved by means of a corresponding method and in that the carrier 22 and a crossbar 21 are articulated vertically movably, for example by means of cranks 14, on a crossmember 10 fastened to the sheet brake 9. Lower stops 12 and wedges 13 are arranged in the direction of the stack on the carrier 22, and mountings 17 for rear sheet holding-up devices 16 are provided on the side of the carrier 22 facing away from the stack. The sheet holding-up devices 16 pivot inwards in the stack region when a stack board 2 is pushed in. <IMAGE>

Description

The invention relates to a method and apparatus for the exact stack separation of main and auxiliary stacks in non-stop delivery in sheet-processing printing machines or the like. The sheet delivery has front and rear sheet stops for aligning the sheets to be deposited and an insertable auxiliary stacking table or rake for collecting sheets when changing stacks, whereby the main and auxiliary stacks are separated at the same time when inserting rakes or boards.

From DE 2 301 840 A1, a sheet delivery device is known in which, in the area of the sheet leading edge of the sheet to be deposited, support fingers can be pivoted in this area over the main stack. In a further embodiment, an auxiliary stacking table can be inserted over the main stack for the purpose of changing the stack, and on the side opposite the support fingers, upright holders which can be inserted by means of working cylinders are arranged above the stack.

A device for the interim collection of sheets, especially for holding the sheet trailing edge, is known from DE 3 112 558 C2. As a support center for the trailing edge of the arch, angles are used which are rotatably arranged on a holder in the region of the arch brake. The angle brackets have different leg lengths and can fold away due to the weight of the bow, so that the The resulting partial stack arrives on the intermediate stacking board that has now been inserted.

According to DE 3 112 672 C1, a stop for the trailing edge of the sheet is known, which is designed as a traverse and is arranged to be movable up and down with a pair of supporting scissors attached to the sheet brake in conjunction with an intermediate stacking device.

DE 3 937 945 C2 discloses a sheet trailing edge catching device for cantilevers with a non-stop auxiliary stacking device. Controllable catch fingers are arranged beneath the suction roller between rear edge stops, which can be moved together in one plane by means of a rack and pinion by a pneumatic working cylinder.

With the above-mentioned solutions according to DE 2 301 840 A1 and DE 3 112 558 C2, it cannot be avoided that incoming sheets slip back into the machine, in the direction of the sheet emergence, or jam or become deformed between the trailing edge stop and the auxiliary stack.

According to DE 3 112 672 C1, the incoming sheets are prevented from slipping back, but the stop cannot solve the task of exactly separating the sheets from the main and auxiliary stacks.

According to DE 3 937 945 C2, the incoming sheets are prevented from slipping back, but this requires complex training for separating the main and auxiliary stacks. Spearings of sheets in the area of the rear edge are avoided when the rake is pushed in, but the danger is only shifted to the horizontal back and forth movement of the catch fingers. Especially at higher machine speeds (e.g. four sheets per second), skewing operations by the catching fingers cannot be avoided.

In a further development of DE 3 937 945 C2, DE 4 011 286 A1 describes a device whose catch fingers are designed as suction pads. At the top of the suction pads, the deposited sheets are sucked in by means of suction nozzles and the suction pads are pulled back by a defined amount to tighten the sheets. The suction pads move horizontally analogous to DE 3 937 945 C2 and do not remedy the disadvantages already mentioned.

The object of the invention is to develop a solution in order to noticeably minimize the disadvantages mentioned.

The invention solves this problem by the features according to the characterizing part of claims 1 and 2. Further developments result from the subclaims.

The solution according to the invention ensures non-stop operation at maximum machine speed. For example, at a speed of four sheets per second, the main stack is extended during printing. This increases the effective performance of the printing press and has a positive effect on the print quality, since disturbances in the ink / fountain solution balance are avoided and the speed of the printing press does not have to be reduced during the printing process to change the batch. The sheet delivery is equipped with a lowerable auxiliary stack and a separating device at the rear sheet stop for the exact automatic separation of the main and auxiliary stacks when inserting rakes or boards. The main and auxiliary stacks have separate drives that raise or lower the steel plate or steel frame attached to them via four roller chains. Known laterally arranged angle rails pivot laterally in or out. The combination of fixed rear upper stops and vertically movable rear lower stops ensures that the incoming sheets cannot slip back into the machine in the direction of the sheet emergence. The bow brackets become vertical with the rear lower stops when inserting the stacking board or rake into the stack and separate the stack into the main and auxiliary stacks. Since the sheets to be deposited are held at the rear edge above the inserted stacking board / rake, they cannot be shifted or deformed in the direction of the sheet emergence when inserted. The crossbeam, crossbar and beam can be coupled via several coupling gears (articulated gears). In addition to the horizontal forwards and backwards movement, the arch support also has a vertical component. The law of motion of the curve member (crossbar) ensures that the last sheets of the uppermost layer of the main stack are gently stripped off and an exact separation between the main and auxiliary stacks is achieved without impaling by the sheet holder. The gentle stripping can be compared to "leafing through". "Leafing through" the last sheets of the upper layer of the main stack until the bottom sheet of the newly formed auxiliary stack has been reached, and placing the bottom sheet and the subsequent sheets on the sheet holders, the sheet holders moving to the level of the top of the stacking board, causes the exact stack separation. The rear sheet brackets reach a uniform level at the latest when the auxiliary stack is formed (underside of the bottom sheet of the auxiliary stack).

The invention will be explained in more detail using an exemplary embodiment.

Fig. 1

eine schematische Seitenansicht eines Bogenauslegers mit Hilfsstapelbildung für Non-Stop-Betrieb,

Fig. 2

eine Vorderansicht des hinteren Stapelanschlages (Blickrichtung entgegen der Förderrichtung),

Fig. 3

den hinteren Stapelanschlag in Seitenansicht (Schnitt).

Show:

Fig. 1

1 shows a schematic side view of a sheet delivery with auxiliary stack formation for non-stop operation,

Fig. 2

a front view of the rear stack stop (viewing direction against the conveying direction),

Fig. 3

the rear stacking stop in side view (section).

In Fig. 1, a sheet 7 of a sheet delivery is fed by means of chain system 8 and gripper system 6 in the conveying direction 23. The sheets 7 arriving from a printing press are transported via a main stack 1 and placed thereon. Each sheet is deposited with the leading edge of the sheet against known front stops 3 arranged side by side. In parallel to the side parts of the boom, pivotable angle rails 15 are arranged for receiving a stacking board 2. For the purpose of removing the sample sheets or to form an auxiliary stack 5, known front sheet holders 4, which extend over the sheet width, are also arranged.

In the area of the rear edge of the sheets 7 deposited to form a stack, the sheet 1 is preceded by a sheet brake device 9 which can be set depending on the format. Below the sheet brake 9, a transverse cross member 10 is attached to this. On the cross member 10, a plurality of upper stops 11 are arranged next to one another at a distance parallel to the rear edge of the deposited sheet 7. The stops 11 extend vertically upward between the sheet braking device 9. Below the cross member 10, a cross bar 21 is arranged, which is followed by a carrier 22. Traverse 10, crossbar 21 and beam 22 are connected via a plurality of two-way joints 14 in such a way that beam 22 and crossbar 21 can be moved vertically up and down to the fixed crossbar 10. Carrier 22 is wider than the max. Arc width executed, but smaller than the distance between the two angles seemed 15 wedges 13 are attached to the free ends of the support 22 and several lower stops 12 are arranged next to each other on the support 22 across the arc width. At least two of the lower stops 12 are guided with the upper stops 11 such that a relative movement (translation) of the lower stops 12 to the fixed upper stops 11 is possible. The lower stops extend down into the area of the main stack 1. In the present example, two upper stops 11 each have a longitudinal groove on one end face with a defined length, in which a bolt coupled to the associated lower stop 12 is guided. On the carrier 22, a plurality of spring-loaded, rear arch support 16 are arranged at a distance by means of the holder 17. A swivel joint 18 is arranged on the holder 17 and is coupled to a lever 19. Lever 19 is articulated at one end on the sheet support 16 and carries a rotatably mounted roller 20 at its other end. Roller 20 is assigned to the crossbar 21 already described, which acts as a cam member.

The mode of operation is as follows: In a manner known per se, sheets 7 of the gripper system 6, which is articulated on a chain system 8, are guided in the conveying direction 22 via a sheet brake 9 and placed on a main stack 1. The main stack 1 lies on a storage table, not shown, which can be lowered in accordance with the increasing stack height. If the main stack 1 has reached its predetermined height, an auxiliary stack 5 is formed while the continuous printing (at maximum machine speed) so that the main stack 1 can be transported out of the delivery area.

To form the auxiliary stack 5, the front upholders 4 are moved out before inserting the empty stacking board 2 into a position which supports the sheets 7 transported by the gripper system 6 in the region of the front edge (FIG. 1). This creates a free space between the upper edge of the main stack 1 and the lower edge of the auxiliary stack 5 for inserting the empty stacking board 2, counter to the conveying direction 22 in the direction of the rear stacking stops 11, 12. If the stacking board 2 accommodated in angular rails 15 meets the obliquely upwards (in the direction of the gripper system) 6) directed wedges 13, these are moved vertically upwards together with carrier 22 and holder 17 and thus also the lower stack stops 12. The arranged below the stacking board 2, with the lower stack stops 12 coupled rear sheet support 16 are pivoted into the boom area. The pivoting takes place in that when the holder 17 is moved vertically, the roller 20, which is rotatable on the lever 19, abuts against the crossbar 21 which acts as a cam member. A deflection of the lever 19 and thus the pivoting in of the rear upholder 16 is thus effected via the swivel joint 18. Each bracket 16 remains in its horizontal arrangement and also moves vertically. The law of motion of the upholder 16 is such that it swings into the area of the sheet to be deposited and at the same time an exact separation of the main stack 1 and auxiliary stack 5 takes place. This is done in that, at the beginning of the pivoting-in movement of the holding-up device 16, the uppermost sheets 7 of the main stack 1 lie briefly on the tips of the holding-up device 16 and are then placed on the main stack 1 when the holding-up device 16 is moved up. Then the tips of the bracket 16 carry the bottom sheet 7 of the auxiliary stack 5, so that the stacking board 2 can be pushed under the rear lower stacking stops 12. The lower stacking stops 12 lie on the stacking board 2 and thus prevent the sheet 7 from sliding back in the direction of the sheet emergence. If the auxiliary stack 5 is lowered in accordance with the increasing stack height, the carrier 22 and the wedges 13, lower stack stops 12, rear upholstery 16 with lever 19 and roller 20 move downward. The spring-loaded rear bracket 16 is pivoted back out of the stacking area. The main stack 1 has meanwhile been removed, the depositing table is moved to the upper starting position on roller chains and takes over the stacking board 2 with the auxiliary stack 5. The main and auxiliary stacks 1, 5 have separate drives. When lifting the auxiliary stack 5, the angle rails 15 pivot out laterally and move into the upper starting position. The stacking board 2 is not pulled out, but now carries the main stack 1.

Depending on the design of the device according to the invention, to support the relative movement of the lower stops 12 to the Upper stops 11 a plurality of spring elements (tension springs) between the cross member 10 and support 22 may be arranged. In addition to the support by mechanical actuation means, the use of pneumatic working cylinders or analog means is also possible. A working cylinder can be coupled with sensors that are activated when the stacking board / rake is inserted.

To increase the rigidity of the device according to the invention, the coupling of the crossmember 10, the crossbar 21 and the support 22 can take place via coupling links connected on both sides (the side facing and stacking area) by means of joints.

Reference list

1

Main stack

2nd

Stacking board

3rd

attack

4th

front bow support

5

Auxiliary pile

6

Gripper system

7

arc

8th

Chain system

9

Bow brake

10th

traverse

11

upper rear stop

12th

lower rear stop

13

wedge

14

Two strikes

15

Angle rail

16

rear bow support

17th

bracket

18th

Swivel

19th

lever

20th

role

21

Crossbar

22

carrier

23

Direction of conveyance

Claims (7)

Process for exact stack separation of main and auxiliary stacks in non-stop delivery of sheet-processing printing machines,
characterized by
that deposited, last sheets of the upper layer of a main stack are leafed through at their trailing edge by means of sheet holders which pivot horizontally and vertically on a curved path into the stacking area until the bottom sheet of an auxiliary stack which is newly formed on an inserted stacking device is leafed through and then the bottom and the following, the sheets forming the auxiliary stack are placed on the sheet holders by moving the sheet holders to the level of the upper surface of the stacking device. Device for carrying out the method, using stops and sheet retainers for the leading and trailing edge of the sheet, a traverse with fixed stops being arranged on a sheet brake device which can be set in the area of the trailing edge of the stack,
characterized by
that on the fixed upper stops (11) lower on a vertically movable, extending in elongated length below the insertion level for a stacking device, for example a stacking board (2), extending supports (22) are arranged, the support (22) is coupled to actuating means which, when the stacking device, for example the stacking board (2), is inserted, cause the vertical movement of the carrier (22) and, on the side of the carrier (22) facing away from the stacking region, support and guide means for the horizontal and combined vertical pivoting of sheet holders (16) are arranged in the stacking area. Device according to claim 2,
characterized by
that - At least two fixed, upper stops (11), lower stops (12) fastened to a support (22) are guided in parallel, wherein supports (22) and a parallel crossbar (21) by means of coupling members and joints on which the stops ( 11) supporting crossmember (10) are articulated vertically, - Wedges (13) projecting into the stacking area are arranged on the free ends of the carrier (22) and are directed obliquely upwards into the insertion plane of the stacking board (2), - Holders (17) are arranged on the side of the carrier (22) facing away from the stacking area, in the pivot joint (18) of which a lever (19) is mounted and at one end of the lever (19) a bow holder (16) is articulated and a roller (20) which is in engagement with the transverse rod (21) in the form of a cam member is arranged at the other end, - The vertically movable carrier (22) extends in an elongated length below the insertion level for the stacking board (2). Device according to claims 2 and 3,
characterized by
that on at least two fixed, upper stops (11), lower stops (12) fastened to a carrier (22) are guided in parallel, the carrier (22) and a parallel crossbar (21) by means of two strikes (14) on the stops (11) supporting crossmember (10) are articulated vertically. Device according to claims 2 and 3,
characterized by
that the stacking board (2) is a rake which can be inserted counter to the conveying direction (23) and in the conveying direction (23) is traceable. Device according to claims 3 and 4,
characterized by
that the cross bar designed as a cam member (21) has a groove curve in which the roller (20) is guided. Apparatus according to claim 6,
characterized by
that the groove curve on the crossbar (21) is designed with a crossing point, so that the support brackets (16) swivel back from the auxiliary stack (5) in the area of the uppermost position.

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