EP1155833B1 - Control device for a gripper of a front gripper in a sheet processing machine - Google Patents

Abstract

The gripper control device has a roller lever (12) provided with a cam roller (14) engaging a control cam (17), which is supported at one end by a stationary lever point (H) and coupled to a spring system (13) at its opposite end, which also cooperates with a coupling drive (11,10,8,7), controlling a gripper shaft (4) for the sheet gripper (3).

Description

The invention relates to a control device for Vorgreifergreifer a pre-gripper in a sheet processing machine according to the preamble of the main claim. The control device can preferably be used on a sheet-fed rotary printing machine.

[State of the art]

A control device of this kind is made DE 35 36 535 A1 known and used to open, close and lock the gripper mounted in a rotation axis, swinging pre-gripper. To control the gripper, a curve segment is arranged swinging end in a frame-fixed pivot joint, which is paired with a roller, the roller lever is articulated to the gripper shaft. At the other end of the curve segment is connected via a coupling with a rotatably mounted roller lever whose role is paired with a revolving cam. At the coupling a hydraulic switching mechanism is additionally arranged, which in case of failure, for example in a missing sheet, lifts the roller lever with roller from the rotating cam and pivots the cam segment over the coupling, so that closing the Vorgreifergreifer is prevented in takeover position of the sheet material ( lock function).

Out DE 44 34 623 A1 is an adjusting device with a pneumatically actuated piston-cylinder unit is known in which an overpressure against a force acting on a piston rod, electromagnetic actuated lock can be generated. The barrier is formed by a piston rod connected to the cooperating with an electromagnets ejectable anchor. In a false-sheet detection, the electromagnet is de-energized and biased by the cylinder chamber air and by the inflowing air, the actuating movement is carried out immediately and thereby the inlet of a missing sheet in prevents the sheetfed press. The adjusting device is preferably used in a device for Fehlbogenabschaltung in Vorgreifer a sheetfed press. In this case, the Vorgreifersteuerung, inter alia, a revolving cam and acting as a cam joint switching segment, wherein circumferential cam and switching segment are connected by means mounted in a rotary joint angle lever. The piston-cylinder unit is in functional connection with the angle lever.

Another gripper control for such a pregripper is off DE 195 43 381 A1 known, which has a circumferential cam and a cam joint for opening and closing the Vorgreifergreifer. The cam joint has a segment with a special control contour for a roller lever with roller, which is articulated on the gripper shaft of Vorgreifergreifers on. The cam segment is connected in a rotary joint with a paired with the revolving cam roller lever with roller. For setting the curve segment, for example, in a missing sheet, designed as a pivotable pawl switching mechanism is provided which can be fixed in an "open" position of the pre-gripper.

The disadvantage of these designs that the gripper controls are relatively expensive and that, for example, in the training DE 195 43 381 A1 that gripper control is not lockable in every machine position. Furthermore, it is disadvantageous that the roller arranged on the roller lever of Vorgreifergreifers addition to the start-up and resting friction at the beginning or ending the relative movement in the cam joint are additionally subjected to an alternating reversal of the direction of movement, so that the wear is promoted.

According to US-A-39 29 069 a pre-gripper control for sheet-fed presses is known which is intended to regulate the spring forces for the pre-gripper drive in a favorable range. The pre-gripper consists of a hollow shaft with internally arranged torsion spring. The torsion spring is biased and effected via a lever and a coupling, that a mounted on a roller lever cam roller is always paired with a control cam. On a bearing axis of the torsion spring, a circular eccentric and a chain guided over the circular eccentric are arranged. The chain is coupled as a traction means with a crank arranged on a drive shaft. During the outward and backward rotation of the hollow shaft, the chain is wound up or unwound onto the circular eccentric.

OBJECT OF THE INVENTION

The invention is based on the object to provide a control device of the type described above, which avoids the disadvantages mentioned, which has a simple structure and ensures a process-stable sheet transport (1st Operation). Furthermore, it is an object to provide a control device which immediately prevents the further sheet transport in case of a disruption of the sheet transport (2nd mode of operation).

This is achieved by the training features of claim 1, further developments will become apparent from the dependent claims.

A first advantage of the control device is that it has a simple structure. When opening and closing the Vorgreifergreifer during trouble-free sheet transport (1st mode of operation of the control device) as well as locking the Vorgreifergreifer (2nd mode of operation of the control device), for example, in a disruption of the sheet transport by missing sheet, double sheet or oblique sheet, is only a circumferential cam with a Cam follower required. In this case, the control cam is preferably arranged on a sheet guiding cylinder, for example on the plant drum adjacent to the pregripper.

Another advantage is that by this design, the wear is reducible, since only one cam roller paired with the cam is required for the control of Vorgreifergreifer. This is a partial reduction and a mass reduction possible. By mating the cam roller with the revolving cam, the known from the prior art, the wear-promoting motion reversal of the cam roller is obsolete.

Furthermore, it is advantageous that low masses have to be moved by the simple construction of the control device. This is also a reduction of vibrations and wear on the vibration system and an improvement in the sheet transport can be achieved.

Another advantage is that in the event of a disruption of the sheet transport, for example, in a message of missing sheet, double sheet, slanted sheet or emergency stop, short switching times for blocking the Vorgreifergreifer in any machine position of the pre-gripper can be realized. In addition, in any position of the pre-gripper blocking the Vorgreifergreifer be eliminated, so that after removal of the disturbance immediately the sheet transport can be resumed.

A further advantage is that an activated for locking actuator and the pairing of cam and cam curve ensuring spring system are rectified in the force effects. This short switching times can be realized and the cam remains in any mode with the control cam in a mating point in functional connection.

[Examples]

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

Fig. 1

eine Steuervorrichtung ohne Betätigungseinrichtung in Übernahmeposition,

Fig. 2

eine Steuervorrichtung mit Betätigungseinrichtung in Übernahmeposition,

Fig. 3

eine weitere Ausbildung gem. Fig. 2,

Fig. 4

die Steuervorrichtung gemäß Figur 2 in Übergabeposition,

Fig. 5

die Steuervorrichtung gemäß Figur 2 nach der Übergabeposition (Vorgreiferauslauf),

Fig. 6

die Steuervorrichtung gemäß Figur 2 in einer beliebigen Sperrposition.

Here are shown schematically:

Fig. 1

a control device without actuating device in takeover position,

Fig. 2

a control device with actuating device in takeover position,

Fig. 3

another training gem. 2,

Fig. 4

the control device according to FIG. 2 in the transfer position,

Fig. 5

the control device according to FIG. 2 after the transfer position (pre-gripper outlet),

Fig. 6

the control device according to Figure 2 in any locking position.

An installation in a sheet-fed rotary printing press has an installation table 1 for aligning the sheet material to be transported in the conveying direction 2 and a pregripper 5 as a vibration system. The pre-gripper 5 is rotatably mounted in a swing axle 9 and has, for example, an oval base body, as is apparent from DE 44 38 757 A1 is known. Furthermore, the pregripper 5 carries a gripper shaft 4 with a plurality of Vorgreifergreifern 3 arranged thereon over the maximum format width and a web with at least one gripper bar 6 arranged thereon. The pregripper 5 is in functional connection with a drive, not shown, for pivoting in the oscillating axis 9 and oscillates , At least for the purpose of taking over the individual sheet material from the investment table 1 (transfer position) and the transfer of the sheet material to a downstream in the conveying direction 2 sheet guiding cylinder 19 (transfer position), between the investment table 1 and the sheet guiding cylinder 19 back and forth. The sheet guiding cylinder 19 is, for example, as a one-speed in the conveying direction 2 circulating investment drum with at least one sheet holding system 18 arranged thereon, preferably a gripper system. At the investment table 1 are further in a known manner transversely to the conveying direction 2 of the sheet material several leading brands and a plurality of deck marks, preferably wegschwenkbar below the conveying plane of the sheet material arranged.

To control the Vorgreifergreifer 3 at a trouble-free sheet transport (1st mode) as well as a disruption of the sheet transport (2nd mode) is the gripper shaft 4 of the pre-gripper 5 with a four-link coupling gear 11, 10, 8, 7 and further with a roller lever 12th with cam roller 14 and cam 17 in functional connection.

In detail, the coupling mechanism 11, 10, 8, 7 consists of an articulated lever 7, which is coupled in a first rotary joint K to the gripper shaft 4. The articulation lever 7 is further connected to a first coupling rod 8 in a third pivot J. The first coupling rod 8 is further coupled to a gear member 10 at the end in a fourth pivot joint B and the gear member 10 is connected at least to a second frame-fixed pivot joint C. With the gear member 10 is pivotally connected to a second coupling rod 11 which is connected in a fifth pivot E with a roller lever 12.

In a first embodiment, the coupling rods 11 and 8 are connected to the mounted in the frame-fixed pivot joint C gear member 10 in the pivot joint B together. The second coupling rod 11 is in turn connected at the end to the roller lever 12 in the pivot joint E Fig. 3).
In a preferred embodiment, the gear member 10 is formed as a ternary member and has at its end the pivot B and at the other end a sixth pivot D and is in the frame-fixed pivot joint C pivotally mounted (Figures 1,2, 4-6). The gear member 10 is connected as a ternary member in the rotary joint B with one end of the first coupling rod 8 and the sixth pivot D with one end of the second coupling rod 11 and the second coupling rod 11 is end coupled to one end of the roller lever 12 in the rotary joint E.

The roller lever 12 is in the end region of the rotary joint E with a frame-fixed elastic spring system 13, preferably a compression spring system in operative connection and is pivotally mounted at the other end in a first frame-fixed pivot H (Fig. 1).

The roller lever 12 carries a cam roller 14 which is mounted in an eighth rotary joint F and which is permanently in functional communication with a control cam 17 circulating in the conveying direction 2 in a mating point 23. The control cam 17 has at least one Greiferschließ- and a gripper opening area for the movement of the Vorgreifergreifer 3 and is preferably arranged on the rotating sheet guiding cylinder 19.

The control for locking the Vorgreifergreifer 3 (2nd mode) has the analog structure (four-link coupling gear 11,10,8,7; roller lever 12 with cam roller 14 and spring system 13; control cam 17) as the control to open and close the Vorgreifergreifer 3 in the 1st mode of operation. However, the roller lever 12 is not supported directly in the frame-fixed hinge H, but between the frame-fixed hinge H and the roller lever 12, a gear member 16 is arranged. The gear member 16 is coupled to the end in the frame-fixed hinge H and the roller lever 12 in a rotary joint G. Furthermore, the gear member 16 with a frame fixedly mounted actuator 15, preferably a pneumatic cylinder, transmission technology coupled. The gear member 16 is in operative connection with at least one frame-fixed stop 20 and / or 21.

Preferably, the gear member 16 is formed with the frame fixedly arranged pivot joint H as a ternary member which is the end side in the second pivot joint G with the roller lever 12 and end in a seventh hinge I with the actuator 15 in operative connection. In this case, the actuating device 15 is preferably mounted pivotably in a third frame-fixed pivot A. Furthermore, the actuating device 15 is preferably connected in terms of circuitry with a machine control.

To limit the pivoting movement of the gear member 16 (ternary member) about the axis of the rotary joint H are preferably adjustable stops 20 and / or 21 arranged fixed to the frame. These stops 20, 21 are preferably arranged in the region of the swivel joints G and / or I.

The hinges B, D, E, G and I are designed to swing freely. By contrast, the hinges A, C and H are arranged fixed to the frame.
The frame-fixed spring system 13 is preferably arranged parallel to the second coupling rod 11 on the roller lever 12. In a further embodiment, the spring system 13 is arranged integrated in the second coupling rod 11.

In a first mode of operation for trouble-free sheet transport, the driven pre-gripper 5 vibrates with pre-gripper claws 3, gripper shaft 4, gripper loading bar 6, articulation lever 7 and first coupling rod 8 about the oscillating axis 9. In the take-over position (FIGS. 1 and 2), the pre-gripper claws 3 close of the single sheet material, in the transfer position (Fig. 4) open the Vorgreifergreifer 3 by the controlled by the cam 17 roller lever 12 (with roller 14) the coupling rods 11 and 8 and the lever 7 in the pivot points of the hinges E, D (if present), B, J and K are turning. The gear member 10 remains in its original position. Closing the Vorgreifergreifer 3 takes place in the reverse order.

Preferably, the pivot B of the pre-gripper is arranged congruently to the oscillating axis 9, i. both positions (B, 9) have a common axis, but lie in different planes (FIGS. 1-4). The congruence is during the trouble-free sheet transport from the transfer position to the transfer position to the sheet guiding cylinder 19th

The pre-gripper rapier 3, which is accelerated to the machine speed, transfers the sheet material individually to a sheet-holding system 18 of the sheet-guiding cylinder 19 in the transfer position (FIG. 4). The pregripper 5 swings into a discharge position after the transfer position (FIG. 5) and from there back into the transfer position (FIG 1 - 3). During trouble-free sheet transport, the actuator 15 holds the gear member 16 in a defined by at least one stop 21 and / or 22 position against the force of the spring system 13, so that the mating point 23 is constantly formed by the cam roller 14 and the cam 17.

If a disturbance, for example a missing sheet, oblique sheet, a double sheet or emergency stop, occurs during the sheet transport, the pregripper 5 is controlled in a second mode of operation. The reported disturbance causes the actuator 15, for example via the machine control, is activated. The actuator 15 pivots the gear member 16 about the axis of the hinge H, so that the hinge G in the position G 'and in the form of a ternary member, the rotary joint I is moved to the position I' (Fig. 6). The pivoting movement is in turn defined by the adjustable stops 20 and / or 21. Since the cam roller 14 is constantly engaged by the spring system 13 with the control cam 17 in the mating point 23, the roller lever 12 is pivoted in the pivot G ', so that the pivot E in the position E' (including the second coupling rod 11) is moved and the gear member 10 is pivoted about the pivot point of the rotary joint C.
In this pivotal movement of the gear member 10, the originally preferred congruent to the swing axle 9 arranged pivot B is moved to the position B 'and - if present - the pivot D is moved to the position D'. The pivoting movement of the gear member 10 is transmitted via the first coupling rod 8, pivot J` and lever 7 in the rotary joint K on the gripper shaft 4 and the Vorgreifergreifer 3 are locked in the respective initiated closing or opening movement, so that between Vorgreifergreifer 3 and the Greiferaufschlagleiste. 6 a free space 22 is formed. Thus, the Vorgreifergreifer 3 are lockable in any machine position, so that a sheet transport is prevented by the free space 22 process stable.

In this second mode of operation initiated by the actuator 15 movement of the gear member 16 and the associated movement of the roller lever 12 in the rotary joint G, G 'is additionally supported by the spring system 13 maintaining its direction of force. This results in short switching times with low mass acceleration. If the obstruction gripper becomes blocked after the fault has been eliminated 3 canceled by the actuator 15, the pre-gripper 5 is operable again in the first mode.

In summary, the control device is executable in two modes.

In the first mode of operation for trouble-free sheet transport of the roller lever 12 is mounted with cam roller 14 end in a frame-fixed pivot joint H, at the other end of the roller lever 12 with a spring system 13 for continuously maintaining a mating point 23 of cam roller 14 and cam 17 in functional connection and on to spring system 13 same end of the roller lever 12 a mounted in a frame-fixed pivot joint C coupling 11,10,8,7 hinged, which is in operative connection with the gripper shaft 4 for controlling the Vorgreifergreifer 3 in the rotary joint K.

In the second mode of operation in the event of a malfunction of the sheet transport of the roller lever 12 is coupled with cam roller 14 end in the pivot joint G with the bearing fixed to the hinge H gear member 16, wherein the gear member 16 is coupled to a frame fixedly mounted actuator 15 geared and the gear member 16 at least an adjacent stop 20,21 is associated with fixed to the frame, and that the roller lever 12 at the other end with the spring system 13 for continuously maintaining a mating point 23 of cam roller 14 and cam 17 in operative connection and adjacent to the spring system 13 at the same end of the roller lever 12 in a frame-mounted pivot joint C mounted coupling gear is articulated 11,10,8,7, which with the gripper shaft 4 for controlling the Vorgreifergreifer 3 in a rotary joint K in Functional connection is.

[REFERENCE LIST]

1

feed table

2

conveying direction

3

Vorgreifergreifer

4

gripper shaft

5

pregrippers

6

Gripper bar

7

Feedback lever

8th

first coupling rod

9

swing axle

10

transmission member

11

second coupling rod

12

roller lever

13

spring system

14

follower

15

actuator

16

transmission member

17

cam

18

Sheet holding system

19

Sheet guiding cylinder

20

attack

21

attack

22

free space

23

pairing position

A

third frame-fixed swivel

B, B '

fourth swivel joint

C

second frame-fixed swivel joint

D, D '

sixth rotary joint

E, E

fifth pivot

F

eighth swivel joint

G, G '

second pivot

H

first frame-fixed swivel joint

I, I '

seventh rotary joint

J, J '

third pivot

K

first rotary joint

Claims (9)

1. A control device for pre-gripper grippers (3) of a pre-gripper (5) in a sheet processing machine, wherein the pre-gripper mounted in a swing axle (9) capable of being driven in a swinging manner has at least one pre-gripper gripper for the individual transport of sheet material and is operationally connected through gearing with a rotating control cam (17) paired with cam rollers (14) mounted in a rotatable manner in a roller lever (12),
   characterized in
   that the roller lever (12) with cam roller (14) at the end side is mounted in a first frame-fixed hinge joint (H) and
   that the roller lever (12) at the other end is operationally connected with a spring system (13) for the continuous maintenance of a pairing point (23) of curve roller (14) and control cam (17) and a coupling gear (11,10,8,7) mounted in a second frame-fixed hinged joint (C) at the same end of the roller lever (12) relative to the spring system (13), which with a gripper shaft (4) for the control of the pre-gripper gripper (3) is operationally connected with a first hinge joint (K).
2. The control device according to claim 1,
   characterized in
   that the roller lever (12) with cam roller (14) at the end side in a second hinge joint (G) is coupled with a gear member (16) mounted in the first frame-fixed hinge joint (H), wherein the gear member (16) is coupled through gearing with an actuation device (15) mounted in a frame-fixed manner and at least one neighbouring stop (20, 21) is assigned to the gear member (16) in a frame-fixed manner.
3. The control device according to claim 1 or 2,
   characterized in
   that the coupling gear (11,10,8,7) is formed of

   - an articulation lever (7) arranged on the gripper shaft (4),

   - a first coupling rod (8) connected with the articulation lever (7) in a third hinge joint (J),

   - a gear member (10) connected with the first coupling rod (8) in a fourth hinge joint (B), which is mounted in the second frame-fixed hinge joint (C), and

   - a second coupling rod (11) connected with the gear member (10) in a swing-moveable manner, which is connected in a fifth hinge joint (E) with the roller lever (12).
4. The control device according to claim 3,
   characterized in
   that the gear member (10) is a ternary member which on one end is connected with the first coupling rod (8) by means of the fourth hinge joint (B) on the other end is connected with the second coupling rod (11) by means of a sixth hinge joint (D) and is mounted in the second frame-fixed hinge joint (C).
5. The control device according to claim 3
   characterized in
   that the coupling rods (8,11) are jointly connected in the fourth hinge joint (B) with the gear element (10) mounted in the second frame-fixed hinge joint (C).
6. The control device according to at least claim 3,
   characterized in
   that the fourth hinge joint (B) of the pre-gripper (5) during the troublefree sheet transport from the acceptance position to the transfer position is arranged congruently to the swing axle (9).
7. The control device according to at least claim 3,
   characterized in
   that the frame-fixed spring system (13) is arranged parallel to the second coupling rod (11) or integrated in the second coupling rod (11).
8. The control device according to at least claim 2,
   characterized in
   that the actuation device (15) is mounted in a third frame-fixed hinge joint (A).
9. The control device according to at least claim 2,
   characterized in
   that the gear member (16) is a ternary member which at one end is connected with the actuation device (15) by means of a seventh hinge joint (I), on the other end is connected with the roller lever (12) by means of the second hinge joint (G) and is mounted in the first frame-fixed hinge joint (H).

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