EP1477445A1 - Device for loading brochures onto a machine with three knives - Google Patents

Abstract

The loading system has conveyer belts (5) bringing brochures (1) in an overlapping stream (2) to a magazine (17). The brochures form a stack at an upper level (18), standing on movable flaps and ready for dropping to a lower level (25). The stacks of brochures (3) are moved sideways into a three-knife page cutting and trimming machine where they are cut to the finished size.

Description

The present invention relates to a device for loading a three-knife cutting machine with brochures, magazines or the like. Bound book blocks according to the preamble of claim 1 .

A three-knife trimmer is used to trim the three unbound ones Edges of a book block, magazine or brochure. These receive their final format. The three-knife cutting machine works against the cutting bars in the diagonal cut working side and front knives according to the knife cutting principle, the Three-sided trimming is realized in a cutting station. For this, the book blocks fixed on the cutting table by a press stamp under pressure and the side and the Front trimming is done by phase-shifted knife movements. The products can processed individually or in a stack with a maximum stack height of up to 80 mm become.

The three knife cutting machine is often in a flow line with an adhesive binding line or a book production line. The supply and discharge of the products take place automatically via conveyor belts. To compensate for the differences in performance of the coupled machines, the three-knife cutting machine is a pre-stacking device upstream. EP 0 887 157 A2, for example, describes a pre-stacking device known for a three-knife cutting machine, which with a magazine with two two-part, for opening and closing horizontally movable magazine shelves is executed, the upper magazine shelf to form a counted Book block stack and the lower magazine shelf for timed ejection of the formed stack is provided on a feed table.

Known pre-stacking devices can be used in both magazine and counting stacks operate. In the counting batch mode, the book blocks arrive individually and photoelectrically counted in the upper magazine section. After reaching the preselected number the stack is opened by opening the upper magazine shelf onto the one below stored magazine shelf and from there to the storage table on the clock dispensed for pushing out and feeding the stack into the introduction device the three-knife cutting machine. The counting stack mode is particularly suitable for the Processing of thin (2 ... 5 mm thick) and sensitive book blocks. By switching off the magazine shelves are switched to magazine operation. Input Book blocks (from a thickness of approx. 5 mm) fall directly onto the ones arranged below in the magazine Delivery table. A height-adjustable stacking slide determines the stacking height and transports it the book block stack in the insertion device of the three-knife cutting machine. The magazine operation is also suitable for book blocks fed in the shingled stream Book block thickness.

The known pre-stacking devices are thin in terms of processing Book blocks limited in their performance. Because these can due to their low product height not in magazine mode but only in counting batch mode as a stack in exact counted number of three-knife cutting machine are fed. The counting batch operation but requires individually supplied book blocks, whereby the individual funding to the Conveyor belts due to excessive conveying speeds in the curves and transfers can only be carried out safely up to a capacity of approx. 10,000 book blocks / h. Also the delivery of the individually fed book blocks into the upper magazine section is becoming increasingly critical with this funding, because the book blocks with too high Throwing speed against the magazine sidewall. In addition, that is enough Time between two fed book blocks no longer for opening and closing the upper magazine shelf for transferring the stack formed in the lower Magazine section.

The present invention is based on the object of a device for loading a three-knife cutting machine with brochures, magazines or the like bound To propose book blocks according to the preamble of claim 1 with which simple construction a high feeding performance of especially thin book blocks is made possible.

This object is achieved by the features of the characterizing part of claim 1 solved. Preferred further developments of the device according to the invention form the subject of the dependent claims.

The book blocks to be trimmed can now also be used with a product thickness of less than 5 mm in scaled formation are fed to the pre-stacking device. The transfer speed of the book blocks determined by the acceleration conveyor in the magazine of the pre-stacking device, the speed can be limited, necessary for the safe reaching of the opposite intermediate magazine bottom part is. By holding back the following shed part after the handover of the last book block of a shingled stream section into the magazine Time window created for opening and closing the first, upper magazine shelf. The shingled transport also results in fewer and thus controllable conveyor speeds on the book blocks of the loading device feeding conveyor belts, which also with the same transport time (= required drying time) can be configured much shorter.

With the advantage of an enlarged contact area for the book blocks to be accelerated the acceleration conveyor comprises an acceleration roller and at least one conveyor belts reaching forwards to the magazine. In a preferred embodiment the separating device is formed from one arranged above the acceleration roller Pressure roller for the further conveyance of the front part of the scale and one behind the pressure roller arranged separating fingers for holding back the following scale part. The pressure roller and separation finger are used for the separation process on the shingled stream lowered, being in the lowered separation position by relative mobility to each other each rest on the stream of shingles with a defined pressure. This ensures that the next book block to be held back from the separating finger is captured while the pressure roller for a book block to be conveyed further pushes down safely on the accelerator. With the lifting of the The shingled stream is released again by the separating device and by the acceleration conveyor transferred to the magazine.

A is preferably used for counting the book blocks conveyed in the stream of shingles (Laser) copy counter used, seen in the conveying direction behind the separator is arranged above the conveyor belt of the feed conveyor. The Counting pulses of the copy counter are taken into account in a control device the conveying speed of the shingled stream evaluated to trigger the Separation process. The shingled book blocks have proven to be advantageous with a spring-loaded pressure roller on the front end of the accelerator hold down, creating the book blocks for safe delivery into the magazine be braced.

With the advantage of a quick actuation in the sense of opening and closing the first, upper magazine shelf formed from two aligned side by side Single platforms, with each single platform made in one plane and perpendicular to fingers arranged in a wave and both waves by a common Drive driven in opposite direction downwards out of the magazine and after one complete rotation can be screwed back in. When screwing in again the book blocks quasi pushed down into the lower magazine section while subsequent book blocks are already fed again.

Not only for counting batch operation but especially for magazine operation the pusher, which can be moved back and forth by a separate drive, is suitable. Because of the adjustability of the extension stroke according to the height of the front trim format adjustments on the feed conveyor and in the stacking magazine are not required. An advantageous design of the movement profile results when the return stroke of the pusher essentially opposite to the movement of the stack on end of the gripper which is pushed out and pulled out of the magazine the import device is designed. As a result, a third magazine shelf is formed , which ensures that the subsequent book blocks are not one-sided slide (magazine operation) or which makes it possible to slide on the second magazine shelf discard lying batches earlier (counting batch mode).

Fig. 1

zeigt in einer schematischen Vorderansicht eine im Zählstapelbetrieb betriebene Beladevorrichtung im Moment der Stapelbildung auf dem oberen Magazinzwischenboden.

Fig. 2 u. 3

zeigen in gleicher Ansicht die Beladevorrichtung beim Ablegen eines gebildeten Stapels auf den unteren Magazinzwischenboden.

Fig. 4

zeigt die Beladevorrichtung in einer in Fig. 3 durch den Verlauf IV-IV definierten Seitenansicht mit dem auf dem unteren Magazinzwischenboden abgelegten Stapel.

The invention is explained in more detail with reference to the drawing using an exemplary embodiment.

Fig. 1

shows a schematic front view of a loading device operated in the counting stack mode at the moment of stack formation on the upper intermediate shelf.

Fig. 2 u. 3

show in the same view the loading device when placing a stack formed on the lower magazine shelf.

Fig. 4

shows the loading device in a side view defined by the course IV-IV in FIG. 3 with the stack deposited on the lower intermediate shelf of the magazine.

The loading device according to the invention consists of a feed conveyor 4, a stacking device 16, a storage table 28 and a pusher 29 and is connected upstream of the insertion device 35 of a three-knife cutting machine. The feed conveyor 4 is formed from a conveyor belt 5 continuously driven at a first speed v _s and an acceleration conveyor 6 adjoining it in the conveying direction and driven at a higher speed v _B.

The book blocks 1 to be trimmed are fed along the book block height H in a scale flow 2 to the stacking device 16, a subsequent book block 1 resting on the previous book block 1 . When the acceleration conveyor 6, which consists of an acceleration roller 7 and a plurality of conveyor belts 8 arranged next to one another, is reached, the book blocks are withdrawn from the scale stream 2 at the higher speed v _B and thrown into a magazine 17 of the stacking device 16, which is separated by magazine side walls 17 a to d is limited. A spring-loaded pressure roller 9 is provided at the front end of the acceleration conveyor 6 for stiffening the book blocks 2.

The stacking device 16 can be operated in magazine and counting stack mode. In the figures show the counting stack mode. The book blocks 1 at Throw it into the magazine 17 first on an upper magazine shelf 18 a stack 3 stacked one on top of the other. When the desired number of book blocks is reached the magazine shelf 18 is opened and the stack 3 to a lower one Intermediate magazine floor 25 thrown off.

The upper intermediate magazine base 18 is formed from two lying side by side in alignment Individual platforms 19 a, b, each individual platform from in one plane and vertically to a shaft 20 arranged fingers 21 and both shafts 20 by one common drive driven in opposite directions downwards out of the magazine 17 and screwed back in after a complete turn to open and closing the magazine bottom 18. The drive is carried out by a geared motor 24, the rotational movement of which via a spline shaft 23 and bevel gear drives 22 the two waves 20 is transmitted.

The lower intermediate magazine base 25 consists of two aligned side by side Single platforms 26 a, b, which are used to open and close the magazine shelf 25 operated by pneumatic cylinders 27 are horizontally extended and retractable. In Fig. 1 the lower magazine shelf 25 is open and the stack 3 is placed on the storage table 28 dropped. In Fig. 2, the individual platforms 26 a, b to close the Intermediate magazine floor 25 retracted.

The stack 3 deposited on the storage table 28 is pushed out of the magazine 17 along its book block width B with one end, so that it can be moved back and forth by a separate drive, transversely to the feed direction, and transferred to a gripper 36 of the insertion device 35 of the three-knife cutting machine. The drive for the pusher 29 is formed from a geared servo motor 34, the rotational movements of which are converted via a toothed wheel 33 and a toothed rack 32 into a linear back and forth movement of a holder 30 guided on guide shafts 31, on which the pusher 29 is changeably fastened.

The stroke of the ejector 29 is adjustable according to the height F of the front trim (A _F ). With the adjustment A _F , previously necessary adjustment devices in the feed conveyor 4 and in the magazine 17 are eliminated. The return movement of the ejector 29 takes place essentially opposite to the movement of the gripper 36 which takes over the stack 3 at the ejected end and pulls it out of the magazine 17. As a result, a quasi third magazine intermediate floor is provided for a subsequent stack 3 for throwing off the stack 3 immediately after the eject previous stack 3.

The gripper 36 is formed from a lower plate 37 and two upper gripper plates 38 and 39 and transfers the ejected stack 3 to the cutting station in two strokes 41 of the three-knife cutting machine. For the first stroke, the gripper 36 clamps the extended one End of the stack 3 with the upper rear gripper plate 39 on the lower Plate 37 and pulls the stack 3 into an alignment station, not shown in the figures. The gripper 36 is raised by lifting the upper gripper plates 38 and 39 and simultaneous lowering of the lower plate 37 released and moved back into the takeover position. Now the aligned stack 3 with the upper front gripper plate 38 clamped on the lower plate 37 and in the forward movement of the gripper 36 on the Cutting table 44 of the cutting station 41 pushed. The stack 3 comes with a press stamp 42 pressed and trimmed on three sides. 4 is for the sake of illustration only the front knife 43 shown.

With the gripper 36, the upper rear gripper plate 39 is adjustable relative to the front gripper plate 38 (G _B ). With the adjustment G _B the book block width B is taken into account. The cyclic movement of the gripper 36 is shown in FIG. 4 by the representation of the movement profiles 40 a, b for the upper gripper plates 38, 39 and the lower plate 37.

According to the invention is in the transition area from the conveyor belt 5 to the acceleration conveyor 6 a separator 11 is arranged. It serves to hold back a subsequent one Part of the scale, creating a gap in the stream 2 for opening and Closing the first upper magazine shelf 18 is created. The separator 11 is formed from one arranged above the acceleration roller 7 Pressure or separation roller 12 for further conveyance of the front part of the scale and one seen in the conveying direction behind the separating roller 12 arranged separating fingers 13 for Restraining the following part of the shed. Separating roller 12 and separating finger 13 are in a holder 14 moved up and down controlled by a pneumatic cylinder 15, the separation roller 12 is freely rotatable and the separation finger 13 vertically is guided in a guide 14a displaceable to the conveying direction.

For separating the stream 2 and retaining the following part of the scale the separation device 11 with the separation roller 12 and the separation finger 13 on the Scale stream 2 lowered. The separation roller 12 lies with the through the pneumatic cylinder 15 generated pressing force on the front part of the scales, so that the still book blocks 1 to be conveyed are safely conveyed further by the acceleration conveyor 6. The separating finger 13 lies down due to its own weight and the relative mobility to the separation roller 12 on the scale stream 2 and holds the next in Scale stream 2 backed book block 1. After creating a sufficient Gap in stream 2 for opening and closing the upper magazine shelf 18, the separator 11 is raised for transferring the following Part of the scale in the stacking device 16.

When the last book block 1 of the front shed part is thrown into the magazine 17, the upper magazine shelf 18 is opened. The fingers 21 of the two individual platforms 19 a, b come again through their rotary movement coming from above into the magazine 17 and press the stack 3 virtually down onto the lower magazine shelf 25, while the first book block 1 of the one to be formed thereafter Stack 3 falls on the individual platforms 19 a, b.

A (laser) copy counter 10 is provided for counting the book blocks 1 conveyed in the shingled stream 2, which counter counter 10 is arranged above the conveyor belt 5 of the feed conveyor 4, as seen in the conveying direction. The counting pulses of the copy counter 10 are evaluated in a control device (not shown in more detail) taking into account the conveying speed v _{s of} the scale flow 2 in order to trigger the separation process exactly.

The explanations given above relate to the counting batch mode with book blocks 1 fed in the shed stream 2 Book blocks are processed in the counting batch mode. The separator 11 is then not required. For the magazine mode, where the separator is not either is used, the magazine shelves 18 and 25 are also from the magazine 17 moved out. Book blocks are fed individually or in the stream of shingles dropped directly onto the table 28. It forms a stack on top of one another layered book block stock, from each of which a partial stack from the ejector 29 is pushed out, the number of book blocks in the partial stack by the height of the replaceable pusher 29 is defined. The return movement of the Ejector 29, which is essentially opposite to the movement of the stack taking over at the extended end and pulling out of the magazine 17 Gripper 36 takes place. The sagging book block stock becomes a two-part and the synchronously opening magazine shelf is provided for safe storage the storage table 28.

LIST OF REFERENCE NUMBERS

1

book block

2

shingle stream

3

stack

4

feed conveyor

5

conveyor belt

6

accelerating conveyor

7

accelerating roll

8th

conveyor belts

9

capstan

10

(Laser) copy counter

11

separator

12

separation roller

13

separating finger

14

holder

14a

guide

15

pneumatic cylinder

16

stacker

17

magazine

17 a..d

Magazine sidewalls

18

upper magazine shelf

19 a, b

Single platform

20

wave

21

finger

22

bevel gear

23

splined shaft

24

gearmotor

25

lower magazine shelf

26 a, b

Single platform

27

pneumatic cylinder

28

tray table

29

ejector

30

holder

31

guide shaft

32

rack

33

gear

34

Transmission servomotor

35

import facility

36

grab

37

lower plate

38

upper, front gripper plate

39

upper, rear gripper plate

40 a, b

motion profile

41

cutting station

42

press die

43

front knife

44

cutting table

H

Book block height

B

Book block width

G _B

Book block width adjustment

F

Front trim height

A _F

Front trim height adjustment

V _p

conveyor speed shingle stream

V _B

Conveyor speed on accelerating conveyor

Claims (8)

Device for loading a three-knife cutting machine with brochures, magazines or the like.bound book blocks (1) with a feed conveyor (4), with a stacking device (16) which can be operated in magazine and counting stack mode and which has a magazine (17) with a first upper magazine intermediate floor (18 ) and a second lower magazine shelf (25), as well as with a storage table (28) arranged underneath and with an ejector (29) for the isochronous feeding of a stack (3) of book blocks into the insertion device (35) of the three-knife cutting machine, characterized in that the feed conveyor (4) is formed from a conveyor belt (5 ) continuously driven at a first speed (v _s ) and an acceleration conveyor (6) adjoining it in the conveying direction and driven at a higher speed (v _B ) , and a separating device (11 ) for book blocks (1) fed into the stream (2) in the transition The area from the conveyor belt (5) to the acceleration conveyor (6) is arranged to hold back a subsequent scale part, thereby creating a gap in the scale flow (2) for opening and closing the first magazine shelf (18). Apparatus according to claim 1, characterized in that the acceleration conveyor (6) comprises an acceleration roller (7) and at least one conveyor belt (8) extending forward to the magazine (17). Apparatus according to claim 1 or 2, characterized in that the separating device (11) is formed from a pressure roller (12) arranged above the acceleration roller (7) for further conveying the front scale part and a separating finger (13) arranged behind the pressure roller (12) Retaining the following scale part, the pressure roller (12) and the separating finger (13) can be moved up and down in a controlled manner and, in the lowered separation position, each rest on the scale flow (2) with a defined pressure force due to their relative mobility. Device according to one of claims 1 to 3, characterized in that a (laser) copy counter (10) is arranged behind the separating device (11) for counting the book blocks (1) conveyed in the scale flow (2) on the feed conveyor (4). Device according to one of claims 1 to 4, characterized in that a spring-loaded pressure roller (9) is arranged at the front end of the acceleration conveyor (6) for stiffening the book blocks (1) during transfer into the magazine (17) of the stacking device (16) , Device according to one of claims 1 to 5, characterized in that the first upper magazine intermediate floor (18) is formed from two individual platforms (19 a, b) lying flush next to one another, each individual platform consisting of one plane and perpendicular to a shaft (20) arranged fingers (21) and both shafts (20) driven in opposite directions by a common drive downwards out of the magazine (17) and after a complete rotation are screwed back in to open and close the magazine bottom (18). Device according to one of claims 1 to 6, characterized in that the pusher (29) can be moved back and forth by a separate drive and its stroke can be adjusted according to the height (F) of the front trim. Apparatus according to claim 7, characterized in that the movement profile of the return stroke of the ejector (29) is substantially opposite to the movement of a gripper (36) of the insertion device (35) which takes over the stack (3) at the ejected end and pulls it out of the magazine (17). is designed to form a quasi third magazine shelf.

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