EP0827930A1 - Device and method for feeding flat printed products - Google Patents

Abstract

The machine comprises a conveyer unit (10) for transportation of a printed sheet bearing a typographical signature. The conveyer unit has a number of arms (18) each with a grip (23) moved by the signatures (5,6). When each arm makes a rotary movement, the grip dip into the vacant transport assembly (10) belt sections (14) to lift the leading edge of the respective signature. The system reduces the difference in speed between the cutting cylinder surface and the related conveyer belt. The gap is minimised between adjacent signatures caused by the braking effect. The grip provides a reliable means of lifting signatures as they rise from the belt.

Description

The present invention relates to a method and an apparatus for transportation flat products, and in particular a method and a device for Transporting flat printed products with reference to a rotary printing machine.

US 4,132,403 discloses a sheet transfer device for a printing press. It are by a transfer drum that is at least two angularly apart has spaced grippers, sheets from one stack to one in one Printing machine located continuously rotating recording drum moves. The Transfer drum with the grippers is at a relatively low speed rotated, and each of the grippers can be on the transfer drum and relative to the other Grippers can be moved angularly. Thus, each gripper is accelerated after the latter has recorded a sheet at the receiving station, so that the arrival of the Gripper at a transfer station, where it transfers the sheet to the take-up drum passes, the sheet moves at the same speed as the take-up drum becomes. Then each gripper is braked evenly, so that when it goes to Has come back, the gripper is moving at the same speed how the bow moved there

US 4,290,595 shows a rotatable feed or pre-gripper drum. A continuously rotatable feed device for sheet-fed rotary printing presses has one Pre-gripper drum and a gripper bridge movable relative to the drum. The The device further includes a crank-driven linkage transmission mechanism is attached to the drum and rotates with it and operationally with the Gripper bridge is connected to move it.

US 4,629,175 discloses a method and an apparatus for the display of arcuate products that are fed in a stream of flakes. The one Folder coming sheet-shaped products are initially over a certain Route transported before they are caused to overlap each other. To the Braking products so that the overlap can take place and the products become one completely normal supply flow can be arranged without being damaged the products are gripped by grippers that run exactly along a support arcuate path are moved, with the products being gripped by the grippers Speed of a delivery belt is braked and deposited there.

Ultimately, US 4,767,112 discloses a product transfer and transport device for folded copies. To transport folded product copies without a A chain wheel chain engages between the folded sheets of a folded product provided on which grippers are attached, the gripper arms at their outer end exhibit. The gripper elements are at a transfer position or station on a arched path, the fold copies between a counter surface and a movable tongue of the gripper elements, which is then under the pressure of a spring close, be pushed. The gripper elements can be controlled by cornering open and close to take the product copy. The product copies can be transported in a scale formation to a receiving or delivery station will.

In the conventional designs of pinless needles, that was technical problem found that when a signature from the cutting cylinders to a tape system a speed difference between the Cutting cylinder surface and the drive surface of the belts of the belt system arises. This difference in speed can create a gap between the form adjacent signatures. As a result, the signatures can be sent to a Slowdown device can be transmitted.

To create and close this gap between the adjacent signatures the tapes of the tape system must move at a higher speed than that Move the cutting cylinder surfaces. This results in a relative movement between the Band surfaces and the surface of the signature until the signature by one transverse cut between the cutting cylinders is separated from the web. The signatures are therefore subject to considerable mechanical stress, which can lead to damage and lubrication points on the signatures.

The present invention is based on the object Speed difference between the surfaces of the cutting cylinder and the Exclude belt system associated with cutting cylinders.

It is another object of the present invention to fluctuate the distance to minimize between the signatures moved by a braking device.

Another object of the present invention is reliable and safe Grasp the signatures emerging from a tape system.

According to one embodiment of the present invention, a Conveyor device for flat printed products a transport device for transport of the signatures as well as a lot of poor, each one of the Transport device assigned gripping device for gripping the from the Have transport devices appearing signatures, the gripping devices the arms during their rotational movement in non-raised parts of a transport element Immerse the transport device to close the leading edge of a respective signature seize.

The embodiments of the present invention offer the considerable advantage that enough space is now available for a gripping device, with one of their To move components past the front edge of the signatures. The non-sublime Parts of the circumferential transport elements then make it possible to deflect the Trailing edge of the previous signature without the signatures hindering each other.

It is a further advantage of the transport device according to the embodiments of the present invention that the circumferential transport elements of the transport device is a segmented tape with raised and non-raised surface parts. At her Rotate the arms with their gripping device to immerse them in the non-raised parts of the segmented bands steer the trailing edges of the preceding ones Signatures and take the leading edge of the next signature. So is a Distance between the signatures to be transported is no longer necessary because now there is enough space to place the gripping devices in the non-raised parts of the to immerse segmented tapes and the leading edge of a signature in one more reliable way to take. Because there is no more space between the signatures is necessary, the speed difference between the Cutting cylinder surfaces and the belt system can be eliminated.

The advantages and features of the present invention are as follows Description of preferred exemplary embodiments in connection with the attached, drawings explained below.

Fig. 1A

die drehbaren Arme eines Ausführungsbeispiels einer erfindungsgemäßen Abbremsvorrichtung, die einer Transporteinrichtung für Signaturen zugeordnet ist, welche aus einem Spalt zwischen einem Paar von Schneidzylindern austretende Signaturen transportiert;

Fig. 1B

eine weitere Ansicht der in Fig. 1A dargestellten Abbremsvorrichtung;

Fig. 2

die Drehposition eines jeweiligen, eine Greifvorrichtung aufweisenden Armes vor dem Eintauchen der Greifvorrichtung in eine Lücke eines segmentierten Bandes;

Fig. 3

die Greifvorrichtung, welche die Hinterkante einer ersten Signatur in einer Lücke auslenkt, während die Vorderkante einer zweiten Signatur in einen Bereich zwischen Komponenten der Greifvorrichtung eintritt.

Show it:

Fig. 1A

the rotatable arms of an embodiment of a braking device according to the invention, which is associated with a transport device for signatures, which transports signatures emerging from a gap between a pair of cutting cylinders;

Figure 1B

another view of the braking device shown in Fig. 1A;

Fig. 2

the rotational position of a respective arm having a gripping device before the gripping device is immersed in a gap in a segmented band;

Fig. 3

the gripping device, which deflects the trailing edge of a first signature in a gap, while the leading edge of a second signature enters an area between components of the gripping device.

1A shows the general arrangement of an embodiment of the invention. A running web of material 1 enters a gap between a pair of cutting cylinders. The pair of cutting cylinders comprises an anvil cylinder 3 with on its circumference arranged cutting rails 4 and a cutting cylinder 2. After a Cutting is done in the transverse direction, the move out of the gap between the Cylinder surfaces 9 emerging signatures in a transport device 10, the co-operating encircling elements, which in Fig. 1A as a flat or flat belt 11 and a segmented belt 12, each around rollers 16 run, are shown.

The segmented band, or the segmented bands 12 have raised or thick Parts 13 and non-raised or thin parts 14 or gaps, the raised parts 13 preferably have a regular distance 15 from each other. The raised parts 13 mainly support first and second signatures 5, 6, as shown in FIG Figures 2 and 3 is shown in detail. In one embodiment of the invention the length of the signatures 5 and 6 exceeds the length of the raised parts 13. Der The drive of the rollers 16 and the drive of the pair of cutting cylinders 2 and 3 are of this type coupled that the speed of the Schpeid cylinder surfaces 9 and Surface speed of the raised parts 13 of the segmented belts 12 in are essentially the same. This creates a speed difference between the Cutting cylinders 2, 3 and the transport device 10 avoided. Consequently, they are out the gap emerging, cut in the transverse direction signatures 5, 6 in the Transport device 10 transported side by side.

The transport device 10 shown in FIG. 1A is a braking device 17 assigned, which has a plurality of arms 18 rotating about an axis of rotation 26.

As in U.S. Patent No. 5,452,886, the entire contents of which are incorporated herein by reference is described, the arms 18 are above bearings shown in FIG. 1B Pin 31 rotatably mounted. The arms 18 are mounted on a turntable, which in the Figures is not shown. As described in U.S. Patent No. 5,452,886 the turntable on which the arms 18 are mounted is on a level below the in Fig. 1B shown arms 18 and over a star-shaped control disc, which in Fig. 1B as disc-shaped element 19 is shown. The turntable rotates about an axis 26. As can be seen from the circumference of one through the pins 31 of each of those shown in Fig. 1B Arms 18 extending circle can be seen, the turntable has a smaller Diameter than the disc-shaped element 19 and is opposite to that disc-shaped element 19 offset in such a way that the turntable is about Axis 26 rotates while disc-shaped member 19 rotates about axis 26A. However, according to one embodiment of the invention, the turntable and the disc-shaped element 19 at the same speed.

Although the arms 18 are connected directly to the turntable via the pins 31, such as as described in U.S. Patent No. 5,452,886, the arms 18 are not directly associated with connected to the disc-shaped element 19. Rather, there is an end to each Arm 18 belonging control rod 19A with a respective pivot point 34 of the disc-shaped element 19 connected to a desired one Create a speed profile for rotating the arms 18 about the axis 26. The the second end of each control rod 19A is connected to the respective arm 18 via a pin 33 connected. The control rods 19A determine the positions of the arms 18 at each point of the speed profile created in the configuration of FIG. 1B (i.e., that Speed profile due to the different diameters of the turntable and the disc-shaped element 19 and is created by their eccentric axes of rotation). The Arms 18 of the braking device 17 rotate about the axis of rotation 26 in a through the Arrow 27 indicated direction of rotation.

In the embodiment shown in Fig. 1B, each arm 18 includes on its distal end a gripping device 23 in the form of a gripping element which, for. B. from a movably attached gripper finger 24 and a fixedly attached - Gripper rail 25 exists. Control levers 20A are mounted on each of the arms 18 Connection with cams or control cams 30 and cam followers or sensing elements 32 are actuated to cause the gripper fingers 24 to open and close, while the arms 18 are rotated about the axis 26 by the turntable. Consequently are characterized in that the disc-shaped element 19 with respect to the axis of rotation 26th is eccentrically mounted, the rotating arms 18 with a non-uniform Speed profile applied, and the gripper fingers 24 are also caused open at a predetermined point in this speed profile.

With regard to FIG. 1B, there is 22 in a region of maximum tangential speed the tangential speed of the arms 18 substantially in accordance with the Speed of the signatures which arise from the gap between the raised part 13 of the segmented band 12 and the triangular element (e.g. a curved guide 28) emerge from the level belt 11. In a range of minimal tangential Speed 21 is close to the tangential speed of the rotating arms 18 at the tangential speed of a delivery system that the braked Signatures 5 and 6 from the rotating arms 18 takes over.

As the rotational movement of the arms 18 on passing the non-raised Surface parts 14 is coordinated, the gripping devices 23 move in the Area of the non-raised parts 14 into it, which is a more reliable grip of the Allows leading edges of the signatures when they exit the sheet guide 28. After the front edge 7 of a signature to be braked is gripped, slow down arms 18 gradually move along their rotational path along axis of rotation 26. Consequently comes from the rotational movement of the arms 18 a scaled formation of the signatures state in which each of the gripping devices 23 has taken a single signature.

The rotational movement of the arms 18 about the axis of rotation 26 is thus with a irregular speed profile of the arms 18 executed. Move the arms 18 itself in the braking area 21, d. H. in the area of the minimum tangential speed at a lower speed in the circumferential direction and in Acceleration range 22, i. H. in the range of the maximum tangential speed at a higher speed in the circumferential direction.

Figures 2 and 3 show an example of the signature transfer from Transport device to the gripping device 23 in detail.

In Fig. 2, the rotating movement of the arm 18 is attached to it Gripping device 23 in synchronism with the non-raised surface part 14 of the segmented band 12 shown. The gripping device 23 comprises a movable mounted gripper fingers 24 and a fixedly mounted gripper rail 25. Fig. 2 shows the Gripper fingers 24 at a point in time before this trailing edge 8 of a preceding one Signature 8 deflects. It should be noted that the signatures 5, 6 to be transported do not Have a distance (i.e. gap) between them. The leading edge 7 of the following signature 6 to be transported is, as shown, near the rear edge 8 of the Signature 5. The second signature 6 is mainly supported by the raised part 13, whereas the trailing edge 8 of the first signature 5 over the non-raised part 14 is arranged so that the respective rear edge 8 can be bent or deflected.

Fig. 3 shows the gripper finger 24 after this by its rotary and radial Movement has deflected the rear edge 8 of the first signature 5. The Signature trailing edge 8 moves into the area of the non-raised part 14 of the segmented belt 12, the gripper finger 24 behind the front edge 7 of the second signature 6 can move. In this way, the leading edge 7 of the second Signature 6 reliably gripped between the gripper finger 24 and the gripper rail 25 be held while the second signature 6 is held in a certain position. It is no need to keep a distance between the respective signature edges, because the Grasp the leading edge 7 of each signature 6 without being affected by the previous signature 5 takes place, d. that is, the gripping devices 23 have enough space have to move to a position where they have any emerging signature can reliably grasp. The through the non-raised surface parts 14 on the segmented bands 12 thus form gaps Signature transmission areas that are in sync with the rotating movement of the Arms 18 circulate.

The raised parts 13 on the segmented belts 12 or straps can be in one Embodiment be made of an elastic plastic or an elastomer. These raised parts 13 can be attached to the bands 12 (e.g. element 13A of FIG 1A) and also have tooth-shaped recesses (for example element 13B of FIG Fig. 1A), so that it is possible for the gripper fingers 24, the leading edges 7 of the respective to safely take signatures 5, 6 to be transported. As an alternative, series of raised and non-raised parts 13, 14 of the band 12 can be created by Deflection rollers are used to track the path of a belt 12 that is not itself separate raised and non-raised parts is provided to change; d. that is Deflection rollers 13D can be used to deflect the belt and so raised and to create non-raised parts in a transport element, as is done by the Raised part 13C is shown schematically in Fig. 1A. Of course they are Deflection rollers only required if in the band 12 near the Braking device 17, where the gripping devices 23 are in the area of a non-raised one Move part, a raised part is to be formed. For the specialist it goes without saying that any combination of molding techniques the raised parts can be applied.

LIST OF REFERENCES

1

Material web

2nd

Cutting cylinder

3rd

Anvil cylinder

4th

Cutting cylinder

5

first signature

6

second signature

7

Leading edge of a signature

9

Cylinder surface

10th

Transport device

11

flat / flat belt

12th

segmented belt

13

raised, thick parts

14

non-raised, thin parts

15

distance

16

Rollers

18th

poor

19th

disc-shaped element

19A

Control rod

20A

Control lever

21

minimum tangential speed - deceleration range

22

maximum tangential speed - acceleration range

23

Gripping device

24th

Gripper fingers

25th

Gripper rail

26

Axis of rotation of the turntable

26A

Axis of rotation of the disc-shaped element 19

28

Bow guide

30th

Cams or cams

31

Cones

32

Cam follower or sensing body

33

Cones

34

pivot point

Claims (10)

Device for transporting flat products (5, 6) with a Transport device (10) for conveying the products (5, 6) and with a variety of rotatable arms (18), each associated with the transport device (10) Have gripping device (23), wherein the gripping device (23) during a rotation the arms (18) are immersed in a transport element (12) of the transport device (10) and grips the leading edge of one of the products (5, 6). Device according to claim 1,
characterized,
that the transport element (12) comprises a flat belt (11) and a segmented belt (12). Device according to claim 2,
characterized,
that the segmented belt (12) has raised parts (13) and non-raised parts (14), and that the gripping devices (23) when gripping the front edge (7) of the products (5, 6) in the area of the non-raised Engage parts (14). Device according to claim 3,
characterized,
that the raised parts (13) are arranged at equal distances from one another. Device according to claim 3 or 4,
characterized,
that the length of the products to be transported (5, 6) is greater than the length of the raised parts (13) of the segmented belt (12). Device according to one of the preceding claims,
characterized,
that each of the gripping devices (23) has a fixed member (25) and a movable member (24), and that when the gripping devices (23) enter the transport element (12) the front edge (7) of one of the products (5) between the movable member (24) and the fixed member (25) is arranged. Device according to claim 2,
characterized,
that cutting cylinders (2, 3) are provided, the surface speed of which essentially corresponds to the surface speed of the flat belt (11) and the segmented belt (12). Device according to claim 3,
characterized,
that the rotational movement of the plurality of arms (18) with the gripping devices (23) attached thereto takes place in synchronism with the movement of the non-raised parts (14) of the segmented belt (12). A method of transporting flat products, comprising the following steps: Transporting the flat products coming from at least one cutting cylinder along a conveyor path; Deflecting at least one of the flat products from the conveyor path; and gripping the front edge of a product following the deflected product by a gripping device. Method according to claim 9,
characterized,
that the deflection of the products from the conveying path is carried out by the gripping device for gripping the leading edge of a subsequent product.

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