EP0845431B1 - Method and device for a piling device of a printing machine - Google Patents

Abstract

The device comprises, in the area of the stack rear edge, a traverse with fixed stops arranged on a format-adjustable sheet braking device. At least one holding down device (17) is arranged beneath guides (15) for a rear stack underlay (12) in the area of the front edge of the main stack (5) and can pivot inwards onto the uppermost sheet (16) of the main stack. In side frames an axis (20) is fixed, on which is arranged a hollow shaft (24). The hollow shaft is connected with a draw spring (21) and a coupling (26) with the holding down device (17) by means of rotary links (29,30). A tab (18) is coupled with an operating device (19) via a rotary link (25). The holding down device has a control curve (23), which forms a curve gear with a roller (22) fixed to the frame.

Description

The invention relates to a method and an apparatus for a sheet-processing printing machine according to the preamble of the claims 1 and 4.

A method and a device of this type is known from DE 43 17 357 C and DE 44 05 586 C known. Thereafter, a boom device has front and rear sheet stops for aligning the sheets to be deposited and one counter auxiliary stacking pad that can be inserted in the direction of sheet travel, e.g. one Rake or board to catch sheets when changing stacks. This is done when inserting the auxiliary stack pad, a separation of the main and Auxiliary pile. This non-stop boom device has proven itself, but it should be noted that that when inserting the auxiliary stacking pad, e.g. depending on the sheet format and / or basis weight of the printing material and the machine speed, enclosed in the delivery stack between the individual sheets There are air cushions. This leads to disturbances in the exact stack formation, because the sheets are not flat and predominantly in the middle of the delivery stack are increased by the air cushion. When inserting the auxiliary stack pad the upper sheets of the main stack can be directed towards the sheet emergence (opposite the sheet running direction) are entrained or deformed. It can Waste occurs.

DE 42 13 032 A describes a device for taking test sheets in one Boom of a printing press known. An auxiliary stop is about one The leading edge stops can be swung in. Are on both sides assigned to the auxiliary stop for loosening this bow, the Lift the following sheet air-supported over the auxiliary stop, see above that the following sheet as a sample sheet over the front edge of the Boom stack can be extracted by its residual kinetic energy.

According to GB 2 300 414 A, which corresponds to the preamble of claims 1 and 4, is a device for changing the stack on one Sheet printing machine with continuous sheet feeding known. Here comes a separating element, formed from an outside of the stacking area arranged shaft and one or more wedges, for application, which forms the gusset required for the stacking rack insert. The separator lies in the area of the leading edge on the upper sheet of the main stack on. At the same time, they continue to lie above the separating element fed intermediate stack sheet on. The above the separating element Accumulated intermediate stack sheets are released by the Separating element rotates around the shaft and follows the lowered main stack swings out the stacking area again. This solution is on application limited by stacking rakes because the wedges are in the spaces between the stacking rakes have to engage the top edge of the main stack.

The object of the invention is a method and an apparatus for a sheet-fed printing machine to create the above Avoids disadvantages, in particular a uniform insertion of the auxiliary stack pad permitted and avoids moving and deforming sheets.

The problem is solved according to the training features of patent claims 1 and 4. Further developments result from the dependent claims.

According to the invention, the uppermost one becomes when an auxiliary stacking pad is inserted Sheet of the main stack in the area of its leading edge with the neighboring, sheet of the main stack underneath fixed in position. The position is fixed thereby by a horizontal frictional connection at the front edges (Gripper edge) of the adjacent upper sheet in the main stack, which is marked by one of approximately vertically acting force and / or on top of the top sheet Form fit is achieved. The form fit can cover several sheets extend.

This ensures that regardless of the presence of trapped Air cushions in the upper area of the main stack the insertion of the auxiliary stack pad done trouble-free. Possible waste sheets are avoided since the top or top sheets of the main stack are fixed in position and at Insertion of an auxiliary stacking pad, e.g. a board or a rake, this Arches should not be dragged or deformed in the direction of the arch rise can. The operating times for separating the main and auxiliary stacks by inserting them the auxiliary stacking pad will be further shortened.

Fig. 1

eine Non-Stop-Auslegervorrichtung einer Bogendruckmaschine (schematisch),

Fig. 2

eine Darstellung (schematisch) des Vorderkantenbereiches der Non-Stop-Auslegervorrichtung.

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

Fig. 1

a non-stop delivery device of a sheet-fed printing machine (schematic),

Fig. 2

a representation (schematic) of the leading edge region of the non-stop boom device.

A non-stop delivery device 1 essentially consists of a circulating chain system 4 with gripper systems 3, which feed the sheets 2 coming from an upstream printing unit or a finishing unit to a main stack 5 in the sheet running direction 9. The sheets 2 are guided past fixed sheet guiding devices 8 and the sheet guiding devices 10, which are adjustable depending on the format and printed image. The sheet guiding devices 8, 10 are selectively controllable with blowing or suction air. Above the main stack 5, a blowing device 6 is arranged in a field, which supports the depositing of the incoming sheets 2 onto the main stack 5 or an auxiliary stack 28. The incoming sheets 2 are braked in a known manner by a sheet brake 7 and placed on the main stack 5 against leading edge stops 11.
In parallel to the side frames of the non-stop boom device 1, pivotable guides 15, for example angle rails, are arranged for receiving an auxiliary stacking base 12, for example a board or rake. For the purpose of taking out sample sheets or to form the auxiliary stack 28, known front sheet holders 14 are arranged which extend over the sheet width and can optionally be supplied with blowing or suction air. The front sheet retainers 14 are inclined at an acute angle to the horizontal in the area of the main stack 5 or auxiliary stack 28. The front sheet holder 14 can be moved from a waiting position in the leading edge area, outside of main / auxiliary stacks 5, 28, directly into the area of main or auxiliary stacks 5, 28 below the incoming gripper systems 3 and with the incoming sheets 2 to form the Auxiliary stack 28 can be lowered.

In the area of the front edge of the main stack 5 there are 15 below the guides Two hold-down devices 17 are arranged at intervals across the format width. Depending on the application can only be used a hold-down 17. For larger ones Format widths can also be used with multiple hold-down devices 17.

Both hold-down devices 17 are from an approximately vertical waiting position (dash-dot representation), which is parallel to the front edge of the main stack 5, in a Swiveling position in which each hold-down device 17 on the top sheet 16 as well as in succession to further adjacent sheets 2 of the main stack 5 in the area the front edge acts. For this is on an axis fixed in the side frames 20 each hold-down device 17 is pivotably supported by means of a hollow shaft 24. At the Hollow shaft 24 is attached to a tab 18 which in a swivel 25 with a Actuator 19, e.g. a pneumatic cylinder is. The hold-down device 17 itself has a swivel joint 29 with a coupling 26 is connected to the hollow shaft 24. Furthermore, the hold-down 17 with a Tension spring 21 coupled in a rotary joint 30, the tension spring 21 in the area the hollow shaft 24, here in the swivel 25 is fixed in position. There is therefore a coupling gear before, the gear members are pivotable about the axis 20. Still is on the fixed axis 20 a bracket 27 fixed, one of the hold-down 17 assigned role 22 carries. The hold-down device 17 - assigned to the roller 22 - a control cam 23 so that the pivoting movement of the hold-down device 17th through the cam mechanism of cam 23 and roller 22 in conjunction with the Coupling gear is controllable. The tension spring 21 ensures that the cam 23 is always non-positively guided on the roller 22. The law of motion of the Control curve 23 is formed such that the hold-down device 17 from the vertical Waiting position (dash-dot representation) in the area of the main / auxiliary stack 5.28 can be swiveled in and then in approximately vertical direction of movement onto the top sheet 16 is movable. With the approximately vertical movement becomes a Pushing the hold-down device 17 avoided.

The hold-down device 17 has a tip that is non-positively on the uppermost sheet 16 and in succession acts on the adjacent sheet 2 below and is spring-loaded. Alternatively, the tip can also be short needles or have similar configurations, the top sheet 16 and the adjacent the underlying sheet 2 of the main stack 5 is positively fixed in position. Alternatively, the hold-down devices 17 are also synchronous by means of a corresponding transmission technology Coupling of only one actuator 19 can be activated.

A traverse with fixed stops is on in the area of the rear edge of the stack a format-adjustable sheet brake arranged. On further training the separator for the rear edge of the main stack 5 is in the Reference introduction referred to prior art.

This results in the following mode of operation: In a manner known per se, the sheets 2 are fed and deposited by the gripper systems 3 in the sheet running direction 9 to the main stack 5. The main stack 5 lies on a deposit table (not shown) which can be lowered in accordance with the increasing stack height. If the main stack 5 has reached a predetermined height, the auxiliary stack 28 is formed while printing continues. The main stack 5 is thus lowered further towards the floor and can be removed from the delivery area after the auxiliary stack support 12 has been inserted.
In order to form the auxiliary stack 28, the front sheet retainers 14 activated by a sensor are inclined at an acute angle to the horizontal directly below the rotating gripper systems 3 into the area of the main / auxiliary stacks 5, 28. In this position, the following sheets 2 are supported in the area of the front edge and begin to form the auxiliary stack 28. The front sheet holder 14 can be acted upon by suction air to form the auxiliary stack 28. The bottom sheet 2 of the auxiliary stack 28 is thus fixed in position.
By swiveling in the front sheet support 14, a gap is already created, into which the auxiliary stack pad 12 can later be pushed into the guides 15 in the insertion direction 13. A sensor, for example a reflex head, activates the lowering of the auxiliary stack 5, so that the gap becomes a space so that the auxiliary stack support 12 can be inserted in the insertion direction 13 (counter to the sheet travel direction 9). When the auxiliary stacking pad 12 is pushed in, the actuating device 19 is activated in a sensor-controlled manner, the hold-down device 17 swivels from its waiting position into the area of the main stack 5 by means of a coupling mechanism and non-positively fixes the uppermost sheet 16 of the main stack 5 in the area of the leading edge in the vertical direction with the neighboring ones, below it lying sheet 2 in the main stack 5. Thus, the auxiliary stack pad 12 can be inserted up to the trailing edge stop without the uppermost sheet 16 or (underlying) adjacent sheet 2 of the auxiliary stack 5 being able to be displaced in the direction of the sheet emergence. Possible air cushions included in the main stack 5 do not have a negative effect when changing the stack. When the auxiliary stack support 12 reaches its end position, the front sheet support 14 is moved back out of the area of the auxiliary stack 28. The air supply is reversed in that the lowermost sheet of the auxiliary stack 28 is separated from the front sheet holders 14 by blown air. The hold-down device 17 then swings back into its waiting position. The main stack 5 can be run. The depositing table of the main stack 5 is moved to the upper starting position on roller chains and takes over the auxiliary stack support 12 with the auxiliary stack 28.

Reference list

1

Non-stop boom device

2nd

arc

3rd

Gripper system

4th

Chain system

5

Main stack

6

Blowing device

7

Bow brake

8th

Sheet guiding device

9

Direction of sheet travel

10th

Sheet guiding device

11

Leading edge stop

12th

Auxiliary pile pad

13

Direction of insertion

14

front bow support

15

guide

16

top bow

17th

Hold-down

18th

Tab

19th

Actuator

20th

axis

21

Tension spring

22

role

23

Control curve

24th

Hollow shaft

25th

Swivel

26

Paddock

27

bracket

28

Auxiliary pile

29

Swivel

Claims (7)

1. Method for separating an auxiliary pile (28) from a main pile (25) at the sheet front edge with running continuous printing in a non-stop delivery device (1) of a sheet-treating printing press, in which front sheet lifters (14) are moved into the pile region for forming the auxiliary pile (28) an auxiliary pile substrate (12) is inserted below the sheet lifters (14) over the main pile (5) from the sheet front edge into the pile region for taking up the auxiliary pile (28) during a pile change, and
   prior to the insertion of the auxiliary pile substrate (12), a hold down (17) is introduced in the region of the front edge on to the uppermost sheet (16) of the main pile (5),
   wherein the hold down (17) is swivelled in from a vertical waiting position in front of the front edge of the main pile (5) into the pile region,
   characterised in that the hold-down (17) is moved in the vertical movement direction on to the uppermost sheet (16), so that thereby the uppermost sheet (16) is fixed in position with respect to the neighbouring underlying sheet of the main pile (5) in the region of the front edge in substantially vertical direction by means of the hold down (17), and
   that the hold-down (17), after the insertion of the auxiliary pile substrate (12), is swivelled back into the waiting position.
2. Method according to Claim 1, characterised in that by means of the hold-down (17), the uppermost sheet is fixed in force positive fashion relative to the neighbouring sheets.
3. Method according to Claim 1, characterised in that by means of the hold-down (17), the uppermost sheet is positionally fixed in positively locked fashion to the neighbouring sheet.
4. Device for separating an auxiliary pile (28) from a main pile (5) at the sheet front edge during running continuous printing in a non-stop delivery device (1) of a sheet-treating printing press with stops (11) for the sheet front edge and sheet lifters (14) for forming the auxiliary pile (28), an auxiliary pile substrate (12) which can be inserted below the sheet lifters (14) above the main pile (5) from the sheet front edge into the pile region for taking up the auxiliary pile (28) on a pile change and a hold-down (17) which can be introduced before the insertion of the auxiliary pile substrate (12) in the region of the front edge on to the uppermost sheet (16) of the main pile (5),
   characterised in that the hold down (17) is fitted via a link (26) connected with it by means of a pivot (29) and via a tension spring (21) connected with it and via a further pivot (30) to a hollow shaft (24), wherein the hollow shaft (24) is carried by an axle (20) extending below guides for the auxiliary pile substrate (12), and that the hold-down (17) is functionally connected with a cam drive for guiding the movement of the hold-down (17) so that the hold- down (17) swivels in from a vertical waiting position in front of the front edge of the main pile (5) into the pile region, moves in the vertical movement direction on to the first sheet (16) and is swung back into the waiting position.
5. Device according to Claim 4, characterised in that the hold-down (17) has a control cam (23) which, with a fixed position roller (22) constitutes the cam drive for guiding the movement of the hold-down (17).
6. Device according to Claim 5, characterised in that an actuation unit (19) for actuating the hold-down (17) engages by means of a pivot connection (25) on a tab (18) fitted to the hollow shaft (24).
7. Device according to one of Claims 4 to 6, characterised in that the sheet lifters (14) carrying the sheets fed to the auxiliary pile (5) are lowerable.

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