DE10357009B4 - Control device for gripper of a pre-gripper in a sheet processing machine - Google Patents

Abstract

control device for grapples a pre-gripper (6) in a sheet processing machine, wherein in a swing axle (7) mounted, swinging drivable Pre-gripper (6) a plurality of mounted on a rotatable gripper shaft (4) Vorgreifergreifer (3) for single sheet transport of sheet material and rotatable with one in a roller lever (8) mounted cam roller (9) paired control cam (10) geared in Functional connection is, characterized in that parallel to Swing axle (7) a spring-loaded roller lever (8) bearing Intermediate shaft (5) on the pregripper (6) is mounted, that a coupling gear (17 to 20) hinged to the intermediate shaft (5) and the gripper shaft (4) is that the coupling gear (17 to 20) fixed to the gripper shaft (4) is that a two-stroke (11) with a hinge (22) of the linkage (17 to 20) and with a stationary on Vorgreifer (6) stored Swivel joint (12) is coupled, and that in one the two limbs the two-bladed (11) connecting two-ball joint (13) a on the pregripper (6) arranged actuating means (14) is articulated.

Description

The The invention relates to a control device for grippers of a pre-gripper in a sheet processing machine, preferably a sheet material processing Rotational pressure or Painting machine, according to the preamble of claim 1.

[Was standing of the technique]

A control device of this kind is made DE 35 36 535 A1 known and used to open, close and lock the gripper of a mounted in a rotation axis, swinging pre-gripper in a sheet material processing machine. To control the arranged on a gripper shaft gripper, a curve segment is arranged end to 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 revolving cam and pivots the cam segment over the coupling, so that closing of the pregrippers is prevented in takeover position of the sheet material ( lock function).

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 hinged to the gripper shaft of Vorgreifergreifer 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.

In these embodiments, it is disadvantageous that the gripper controls are relatively expensive and that, for example, in the training according to DE 195 43 381 A1 that gripper control is not lockable in any machine position.

Out DE 100 23 669 C1 Further, there is known another pre-gripper control apparatus of a pre-gripper in a sheet-material processing machine. The control device comprises a roller lever with a cam roller, which is mounted end in a frame-fixed pivot and is coupled at the other end with a spring system. At the latter end of the roller lever mounted in a frame-fixed pivot joint coupling mechanism is articulated, which is in operative connection with a gripper shaft for controlling the Vorgreifergreifer in a rotary joint.

[Abandonment of Invention]

Of the Invention is the object of a control device of the to create the aforementioned type, the said disadvantages avoids, in particular, has a simple structure and ensures process-stable sheet transport (first mode of operation). Furthermore, it is an object to provide such a control device, the one in case of a fault The sheet transport immediately prevented another sheet transport (second mode of operation).

According to the invention Problem solved by the Lehrmerkmerk le of claim 1. further developments emerge from the dependent claims.

One the first advantage is that that opening and closing the Vorgreifergreifer during trouble-free Sheet transport (first mode of operation) as well as the blocking of the pre-rapier gripper (second mode), especially in a disruption of the sheet transport by missing sheet, double sheet, oblique sheet, etc., essentially by means of a linkage of simple construction and an actuator is feasible.

One second advantage is that by means of the control device in case of a fault the sheet transport short switching times for locking the Vorgreifergreifer in any machine position or at any machine time are feasible. The movement of the Vorgreifergreifer is thus in any position so changeable that one to hold initiated by sheet material gripper closure is canceled or in the case of an already existing gripper closure this is canceled, so that the sheet material is free.

One third advantage is given by the fact that for the first mode of operation of the opening and closing the Vorgreifergreifer the drive control side, preferably However, centrally on the gripper shaft is transferable. By the preferred Central initiation of the drive control is the occurring torsion noticeable on the gripper shaft reducible. Furthermore, the central drive on the gripper shaft also for the disable function (second mode of operation) can be used.

It is furthermore advantageous that the roller lever transmitting the opening and closing movement of the pregripper gripper control (with cam profile le) with the associated, preferably in the region of the swing axis of the pregripper arranged control cam at the mating point (cam roller / cam) of a cam joint always (in the first and the second mode) is frictionally engaged. This noticeably reduces load change reactions and possible wear in the cam gear.

As well it is advantageous that in the second mode of operation only low inertia during the tearing process the Vorgreifergreifer (second mode of operation) occur.

With the formation of an intermediate shaft supporting the roller lever in parallel to the swing axis of the pre-gripper, the arrangement of the control cam in the range of the swing axle and the arrangement of the linkage between the intermediate shaft and the Vorgreifergreifer bearing Gripper shaft are the relevant masses of the control device near the Arranged swing axis. Thus, the control device is lower dynamic stress of the device parts operable.

The Invention is intended to an embodiment be explained in more detail. It shows schematically:

1 a control device for pre-gripper gripper with a cam joint for the opening / closing movement,

2 the control device according to 1 with an actuating device,

3 the kinematic representation of the control device in the open / close position or locked position.

A processing machine, for example, a sheet-fed rotary printing machine in a row construction, has a plant with a plant table 1 for aligning in the conveying direction 2 to be transported sheet material and a pre-gripper 6 as a vibration system. The pre-gripper 6 is in a swing axis 7 rotatably mounted and carries a gripper shaft 4 with a plurality of pre-gripper grippers spaced therefrom over the maximum width of the format 3 ,

The pre-gripper 6 is with a drive, not shown, for pivoting in the swing axle 7 in functional connection and swings to the constant transport of the sheet material by Vorgreifergreifern 3 from the investment table 1 to one in the conveying direction 2 downstream sheet guiding cylinder, for example, to a collision drum (not shown), and to the investment table 1 back etc ..

For controlling the pre-gripper claw 3 in a trouble-free sheet transport (first mode) as well as a failure of the sheet transport (second mode) is the gripper shaft 4 the pre-gripper 6 with a gear mechanism interposed therebetween with a spring-loaded roller lever 8th with cam follower 9 coupled. The cam roller 9 is with a drivable control curve 10 paired and thus forms in the mating a curve joint. The control curve 10 is preferred on the swing axle 7 rotatably mounted. 1 shows this training on average.

At the pre-gripper 6 is parallel to the swing axis 7 a spring-loaded roller lever 8th with cam follower 9 end bearing intermediate shaft 5 stored stationary. The intermediate shaft 5 is geared by means of a linkage 17 to 20 with the gripper shaft 4 coupled.

The coupling gear 17 to 20 has a first swingarm 17 on, which end fixed to the rotatably mounted intermediate shaft 5 is arranged and at the other end a first, with a first coupling 18 connected swivel joint 21 forms. The first paddock 18 also forms the end with a downstream second coupling 19 a second pivot 22 and the second paddock 19 in turn forms end with a secondary second rocker 20 a third pivot 23 , The second swingarm 20 is also the end fixed to the rotary bar mounted gripper shaft 4 arranged.

At the free, second swivel joint 22 of the linkage 17 to 20 and at a fixed location on the pre-gripper 6 mounted swivel joint 12 is a two-stroke 11 arranged. In one the two limbs of the two-bladed 11 connecting two-ball joint 13 is one on the pre-gripper 6 arranged actuator 14 , which is preferably coupled in terms of circuitry with a central control articulated. In 2 this training is shown in section.

The actuating device is preferred 14 designed as a pneumatically actuated, signal-controlled cylinder.

The signal-controlled actuator 14 is operable so that under force (double arrow 24 ) on the two-joint joint 13 the coupling length of the linkage 17 to 20 in each case one mode of operation of the control device according to the invention is variable. In the first mode of operation, with a trouble-free sheet transport, the two-position swivel joint 13 a relatively small distance to the actuator 14 on, ie the Vorgreifergreifer 3 are in an open / close position 15 operable ( 3 ).

In the second mode of operation, ie there is a disruption of the sheet transport, the two-ball joint is 13 from the signal controlled actuator 14 in the direction of double arrow 24 moved so that the actuator 14 a greater distance exists. This is the two-stroke 11 taking advantage of the toggle effect in a locked position 16 moves, ie the opening or closing movement of Vorgreifergreifer 3 is locked. Because the swivel 12 stationary on pre-gripper 6 is arranged, there is a Längenverände tion of the two-bladed 11 at the second pivot 22 of the linkage 17 to 20 , The swivel joint 22 thus takes the position 22 ' one ( 3 ) and the coupling gear 17 to 20 the blocking of the pre-gripper takes place 3 , When blocking the Vorgreifergreifer 3 open or remain open, so that the sheet material is no longer in the gripper closure.

After removal of the disturbance, the blocking of the Vorgreifergreifer 3 lifted by the two-ball joint swivel 13 (and thus the two-stroke 11 ) in the direction of the actuator 14 from the locked position 16 in the open / close position 15 is moved (double arrow 24 ). For this purpose, the actuator 14 controlled and keeps the two-stroke 11 in the open / close position 15 ,

In a simple embodiment is the actuator 14 a pneumatically actuated cylinder, which pressurizes against the force of a spring, the two-ball joint pivot 13 for trouble-free sheet transport in the open / close position 15 fixed. In case of failure, the spring force is activated immediately by removing the pressure on the cylinder and the two-ball joint 13 is in the blocking position in a very short switching time 16 emotional. If the accident is eliminated, the working cylinder is pressurized again, so that the two-ball joint 13 the opening and closing position 15 resumes.

1

feed table

2

conveying direction

3

Vorgreifergreifer

4

gripper shaft

5

intermediate shaft

6

pregrippers

7

swing axle

8th

roller lever

9

follower

10

cam

11

two stroke

12

stationary swivel

13

Two shock pivot

14

actuator

15

Opening / closing position

16

lock position

17

first wing

18

first paddock

19

second paddock

20

second wing

21

first swivel

22

second swivel

23

third swivel

24

double arrow

Claims (5)

Control device for grippers of a pre-gripper ( 6 ) in a sheet processing machine, wherein in a swing axis ( 7 ) mounted, oscillating drivable Vorgreifer ( 6 ) several on a rotatable gripper shaft ( 4 ) mounted Vorgreifergreifer ( 3 ) for single-sheet transport of sheet material and with one in a roller lever ( 8th ) rotatably mounted cam roller ( 9 ) paired control cam ( 10 ) is technically functionally connected, characterized in that parallel to the oscillating axis ( 7 ) a spring-loaded roller lever ( 8th ) supporting intermediate shaft ( 5 ) on the pre-gripper ( 6 ) is mounted, that a coupling gear ( 17 to 20 ) at the intermediate shaft ( 5 ) and the gripper shaft ( 4 ) is articulated, that the coupling gear ( 17 to 20 ) on the gripper shaft ( 4 ) is fixed, that a two-layer ( 11 ) with a swivel joint ( 22 ) of the linkage ( 17 to 20 ) and with a stationary on Vorgreifer ( 6 ) mounted rotary joint ( 12 ), and that in one of the two members of the two-layer ( 11 ) connecting two-ball joint ( 13 ) one on Vorgreifer ( 6 ) arranged actuating device ( 14 ) is articulated. Control device according to claim 1, characterized in that the coupling gear ( 17 to 20 ) an end fixed to the rotatably mounted intermediate shaft ( 5 ) arranged first rocker ( 17 ), which at the other end with a first, with a first coupling ( 18 ) connected swivel joint ( 21 ), that the first coupling ( 18 ) end with a second pivot ( 22 ) with a third coupling ( 19 ) and the second coupling ( 19 ) end with a third pivot ( 23 ) with a second rocker ( 20 ) and that the second rocker ( 20 ) on the rotatably mounted gripper shaft ( 4 ) is fixed at the end. Control device according to claim 1, characterized in that on the oscillatory axis ( 7 ) the control cam ( 10 ) is rotatably arranged. Control device according to claim 1, characterized in that the actuating device ( 14 ) is a pneumatically actuated cylinder. Control device according to claim 1, characterized in that the coupling gear ( 17 to 20 ) centered on the gripper shaft ( 4 ) is fixed.