EP0668230B1 - Device for separating exactly the main and the auxiliary stacks in the rear edge of the sheets in non-stop-stackers - Google Patents

Abstract

The machine has stops and high holders for the leading and trailing edges of the sheets. The front sheet high holders can be moved into the stack area above the main stack (1) at an angle (`) inclined to the horizontal. Lower stops (15) fixed on a vertically movable support (12) extending stretched beneath the insert plane of a second stack support (2) are movably guided on the stops (14) which are fixed on the cross beam (10). The support (12) has at the free ends wedges (16) projecting into the stack area with the wedge face facing the main stack and directed, seen in the conveyor direction, inclined upwards into the insert plane of the secondary stack support. A coupling rod movable by a work cylinder (19) is connected to ternary members parallel to the side of the support (12) remote from the stack area. These ternary members act in turn on the rear sheet high holders (17) to move same horizontally into a position between the trailing edges of the upper sheets of the main stack. The rear sheet high holders can be moved through engagement of the secondary stack support (2) with the wedges and the resulting lift of the support (12) up to above the main stack (1).

Description

The invention relates to a further embodiment of a method and a device for the exact separation of main and auxiliary stacks in non-stop delivery in sheet-processing printing machines or the like, according to the German main patent No. P 43 17 357.

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 swung in in this area above 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 trailing edge of the sheet is known from DE 3 112 558 C2. Angle supports serve as support means for the trailing edge of the arch, which are rotatably arranged on a holder in the region of the arch brake. The angle supports have different leg lengths and can fold away when several sheets are placed due to the weight of the sheets, so that the resulting partial stack reaches 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 so that it can move 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 between the rear edge stops below the suction roller and 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 rear 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. In particular at higher machine speeds, skewing operations by the catching fingers cannot be avoided. 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 a suction nozzle and the suction pads are pulled back by a defined amount to tighten the sheets. The use of suction pads on the sheet leading edge in jibs is known per se from DE-PS 921 154.

The object of the invention is to develop a solution for the exact stack separation of main and auxiliary stacks on the trailing edge of the sheet.

The invention solves this problem by the features according to the characterizing part of patent claims 1 and 2. The solution according to the invention ensures non-stop operation at maximum Machine speed. For example, at a speed of 4 sheets / 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 front sheet holders, a lowerable auxiliary stack and a separator at the rear sheet stop for exact 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 angles seemed to pivot in or out laterally. 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 front sheet brackets are inclined at an angle to the horizontal and moved into the stacking area and, if necessary, supplied with suction air. The bottom sheet of the auxiliary stack is held by suction air for a certain period of time (suction pad). This is particularly advantageous when processing substrates with a basis weight of <200g / m ² . Due to their lower inherent rigidity when inserting the rake / stacking board, these substrates tend to curl or deform in the direction of the rear edge stops. The rear sheet holders are inserted into the existing stack when the stacking board or rake is inserted and separate the stack into the main and auxiliary stacks. Since the sheets to be deposited further are held on the front sheet holders by their own weight or by suction air (suction gripper), they cannot be rolled, shifted or deformed in the direction of the rear stops when the stacking board or rake is inserted. 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),

Fig. 4

eine Draufsicht auf die Betätigungseinrichtung für die hinteren Bogenhochhalter.

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),

Fig. 4

a plan view of the actuator for the rear sheet holder.

1 shows a sheet 7 fed in the conveying direction 18 by means of chain system 8 and gripper system 6 in a sheet delivery of a printing press. The sheets 7 arriving from the printing press are transported via a main stack 1 and placed thereon. Each sheet 7 is placed with the leading edge of the sheet against known front stops 3 arranged side by side. Parallel to the side parts of the boom, pivotable angle rails 13 are arranged for receiving a stacking board 2. For the purpose of taking out sample sheets or to form an auxiliary stack 5, known front sheet holders 4 are also arranged which extend over the sheet width and can optionally be supplied with suction air. The sheet support 4 are inclined at an acute angle α to the horizontal 24 in the stacking area. In the area of the rear edge of the sheets 7 deposited to form a stack 1, the stack 1 is preceded by a sheet brake device 9 which can be set depending on the format. A transverse traverse 10 is fastened to the latter below the sheet brake 9. On the crossmember 10, a plurality of upper stops 14 are arranged next to one another at a distance parallel to the rear edge of the deposited sheet 7. The stops 14 extend vertically upwards between the Bow braking device 9. Below the cross member 10, a cross bar 11 and a support 12 are arranged in parallel, which are rotatably connected to the cross member 10 via a plurality of couplers 20 such that the support 12 and cross bar 11 are vertically up and down to the fixed cross member 10 . Between the cross member 10 and the carrier 12, two tension-loaded springs 25 are arranged, which support the upward movement of the carrier 12 and the crossbar 11. The carrier 12 is made wider than the maximum arc width, but smaller than the distance between the two angles rails 13. Wedges 16 are fastened to the free ends of the carrier 12 and a plurality of lower stops 15 are arranged next to one another on the carrier 12 via the arc width . At least two of the lower stops 15 are guided with the upper stops 14, for example in a longitudinal groove, in such a way that a relative movement (translation) of the lower stops 15 to the fixed upper stops 14 is possible. The upper stops 14 extend down to the height of the main stack 1. Two ternary links 21 are pivotally articulated on the support 12 on the side facing away from the stack area, the respective three rotary joints of which have a coupling rod 22, the support, arranged parallel to the support 12 12 and rear arch brackets 17 are connected. The coupling rod 22 is preceded by a pneumatic working cylinder 19, which is fixed to the carrier 12 and is connected to an air supply, which is not further described. The rear sheet holder 17 are passed through the carrier 12, so that their tips show in the pivoted state in the stack area. In the present example, the sheet support 17 are additionally guided through the lower stops 15. To detect the stacking board 2 to be inserted, a sensor 23 is arranged in the area of the front stops 3. Likewise, a sensor 26 is arranged in the area of the crossmember 10 in order to recognize the upward and downward movement of the crossbar 11 and the support 12.

The mode of operation is as follows: In a manner known per se, sheets 7 of gripper system 6, which is articulated on a chain system 8, are guided and opened in the conveying direction 18 via a sheet brake 9 a main stack 1 filed. The main stack 1 lies on a storage table, not shown, which can be lowered in accordance with the increasing stack height. When the main stack 1 has reached its predetermined height, an auxiliary stack 5 is formed while the production is running so that the main stack 1 can be removed from the delivery area.

To form the auxiliary stack 5, the front sheet retainers 4 activated by the sensor 23 are moved out when the empty stacking board 2 is inserted, into a position which supports the sheets 7 transported by the gripper system 6 in the region of the front edge. The sheet support 4 are inclined at an angle α of approximately 30 ° to the horizontal 24 in the direction of the stacking area and can optionally be supplied with suction air (suction gripper). Use as a suction pad is recommended for light substrates with a weight per unit area of <200g / m ² . Sucking the printing material onto the sheet support 4 fixes the lower sheet 7 of the auxiliary stack 5 to be formed on the support 4 and prevents the sheet from sliding back or rolling when the stack is changed. By pivoting the sheet support 4 there is a free space between the upper edge of the main stack 1 and the underside of the auxiliary stack 5 for inserting the empty stacking board 2 against the conveying direction 18 in the direction of the rear stops 14, 15 (end position of the stacking board 2). If the stacking board 2 received at an angle 13 meets the wedges 16 directed obliquely upwards (in the direction of the gripper system 6), these are moved vertically upwards together with the carrier 12 and the working cylinder 19 and thus also the lower stacking stops 15. The ones below the stacking board 2 Rear arch support 17 arranged through the lower stops 15 were pivoted into the delivery area, here the main stack 1, simultaneously with the pivoting of the front arch support 4. The pivoting-in is carried out by applying compressed air to the working cylinder 19, and the front arch brackets 4 are also pneumatically coupled to a further working cylinder. By activating the working cylinder 19, the coupling rod 22 becomes parallel to Carrier 12 moves. The coupling rod 22 transmits the movement to the ternary members 21, which pivot about the respective pivot point on the carrier 12 and move the sheet support 17 around the area of the main stack 1. Each holder 17 remains in its horizontal arrangement and additionally moves vertically, due to the impact of the stacking board 2 on the wedges 16. The law of movement of the holder 17 is such that they pivot into the area of the main stack 1 and at the same time separate from the main stack 1 and auxiliary stack 5 is carried out using a stacking board 2. This is done in that at the beginning of the pivoting-in movement of the holder 17, the upper sheets 7 of the main stack 1 lie briefly on the tips of the holder 17 and are then deposited on the main stack 1 when the holder 17 is moved up and the main stack 1 is simultaneously lowered. Thereafter, the tips of the bracket 17 carry the bottom sheet 7 and all sheets 7 of the auxiliary stack 5 following in the meantime, so that the stacking board 2 can be pushed under the rear lower stops 15. The lower stops 15 rest on the stacking board 2 and, together with the pivoted-in upholders 17, prevent the sheet 7 from sliding back in the direction of the sheet emergence. After the stack has been separated, the rear upholders 17 are pneumatically moved back out of the stacking area. This is done using the sensor 26 which detects the respective up and down positions of the cross bar 11 and the support 12. If the auxiliary stack 5 is lowered in accordance with the increasing stack height, the carrier 12 as well as the wedges 16, lower stops 15 and rear arch support 17 move downward. The main stack 1 has now been removed, the depositing table is moved to the upper starting position on roller chains and takes over the stacking board with the auxiliary stack 5. The main and auxiliary stacks 1, 5 have separate drives. When lifting the auxiliary stack 5, the angle rails 13 pivot laterally and move into the upper starting position. The stacking board 2 is not pulled out, but now carries the main stack 1.

Reference list

1

Main stack

2nd

Stacking board

3rd

front stop

4th

front bow support

5

Auxiliary pile

6

Gripper system

7

bow

8th

Chain system

9

Bow brake

10th

traverse

11

Crossbar

12th

carrier

13

Angle rail

14

upper stop (rear edge)

15

lower stop (rear edge)

16

wedge

17th

rear bow support

18th

Direction of conveyance

19th

Working cylinder

20th

Paddock

21

ternary link

22

Coupling rod

23

sensor

24th

horizontal

25th

feather

26

sensor

α

angle

Claims (3)

1. Process for fact separation of an auxiliary pile (5) from a main pile (1) in a non-stop delivery in a sheet working printing press, with stops (3; 14, 15) and sheet lifting holders (4; 17) for the sheet front edge and the sheet rear edge, wherein in the region of the sheet rear edge a cross member (10) is arranged with feed stops (14) on a format adjustable sheet braking device (9),
   characterised in that
   on inserting a pile board (2) front sheet lifting holders (4) and rear sheet lifting holders (17) are swivelled into the pile region, in that the front sheet lifting holder (4) is moved inclined at an angle (α) to the horizontal over the main pile (1) and the rear sheet lifting holder (17) is moved horizontally and vertically into the main pile (1) and after reaching the level of the upper surface of the pile board (2) in end position is retracted from the pile region.
2. Device for carrying out the process according to Claim 1 with stops (3; 14, 15) and lifting holders (4; 17) for the sheet front and sheet rear edges, wherein in the region of the sheet rear edge a cross member (10) is arranged with fixed stops (14) on a format adjustable sheet brake device (9), and parallel to cross member (10) a transverse bar (11) and a carrier (12) with fixed lower stops (15) are vertically movably pivoted by means of link members (20) and pivots,
   characterised in that
   on the free ends of the carrier (12) projecting into the pile region obliquely upwardly in the insertion plane of the pile board (2) directed wedges (16) are arranged and parallel to the side of the carrier (12) turned away from the pile region a link rod (22) movable via a working cylinder (19) is connected with ternary members (21) as guides for rear sheet lifting holders (17) movable substantially synchronously to the front sheet lifting holders (4) into the pile region, wherein the three rotary pivots of each ternary member (21) are connected with the link rod (22), the carrier (12) and the respective sheet lifting holder (17).
3. Device according to Claim 2,
   characterised in that
   the front sheet lifting holders (4) are constructed as suction grippers.

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