DE102013203970A1 - Control device for working elements of sheet-fed printing machine, comprises sensor unit assigned to driven element, which detects movement pattern of driven element, and is connected with working unit acting on driven element - Google Patents

Abstract

The control device comprises a non-uniformly transmitting gear unit with a driven element (6,30), by which the drive of the working elements is carried out. A sensor unit (14,34) is assigned to the driven element, which detects the movement pattern of the driven element. The sensor unit is connected with a working unit (22,35) acting on the driven element. The working unit is configured as a cylinder-piston unit (22.1,35.1), a rotation unit and a servo unit, and is controlled by the signals of the sensor unit.

Description

The invention relates to a control for working bodies of a sheet-processing printing machine, wherein the drive of the working members is effected in each case by an output member of a non-uniformly translating transmission.

In sheet-fed printing machines, it is common practice to realize the functions of the working organs by means of non-uniformly translating gears. So z. B. the sheet gripper in the printing cylinders, transfer cylinder and in the sheet turning unit and the Nachgreifer in the sheet delivery controlled in this way. In such a mechanically acting control of the sheet gripper, the drive of the work organs takes place directly from the main drive of the machine. This leads due to the effective control and mass forces to torque fluctuations, which act on the main drive. The repercussions on the main drive cause dubbing and banding, which leads to a reduction in the efficiency of the sheet-fed printing press.

To eliminate this disadvantage, is in the DE 42 21 929 C2 proposed a gripper control for sheet gripper in a printing press, in which a stationarily arranged pressure generator for a pressure medium via a control device with a servo valve, which is controlled depending on the rotation angle of the printing press, a hinged to a lever of the sheet gripper servo song. The servo member consists of a piston-cylinder unit with a path measuring system formed thereon. The control device has a programmable control computer which is connected to the position measuring system by measuring lines and which controls the setpoint values for the piston of the servo valve assigned to the angle of rotation in a position control loop on the basis of a comparison of desired values and actual values of the travel position of the piston. On the shaft of the sheet-guiding cylinder, a rotary encoder is also provided, which is connected to an angle measuring system associated with the control computer.

With this gripper control, it is possible to reduce the retroactive moments on the main drive, but the solution can only be realized with a high technical effort. In addition, the solution is not suitable to control the sheet gripper at high operating speeds so that a passerhaltige Boigernfassung and sheet transfer is possible, whereby the effectiveness of the sheet-processing printing machine is adversely affected. The elimination of a mechanical coupling can lead to the largest mechanical Haverien with minimal control problems.

In sheet-fed printing machines, it is also common practice to detect with a vibratory drivable pregripper resting on a feed table arched material to accelerate to the speed of the downstream sheet-guiding cylinder and pass it to this. Subsequently, the pre-gripper is decelerated to a reversal position to be accelerated again and thus returned to the feed table to take over another sheet-shaped material. To drive the pre-gripper serve also non-uniform translating gear, often curve mechanisms with curve and counter-curve are used. Due to the cyclically oscillating pre-gripper, negative and positive drive torques occur constantly, the amplitudes of which increase with increasing speeds and format widths, so that the pre-gripper represents the main vibration exciter in sheet-processing machines. The periodic fluctuating torque requirement leads to oscillations in the sheet position and the gear train to the individual processing stations of the sheet-processing printing machine, resulting in registration errors, banding and doubling, whereby the effectiveness of the sheet-processing printing machine is adversely affected.

The object of the invention is to design the control of non-uniformly translating gear driven working members so that the introduction of vibrations and torque fluctuations reduced in the sheet-processing printing machine and thus the effectiveness of the overall machine is increased.

According to the invention the object is achieved by a control according to the features of claim 1.

By the solution according to the invention, it is possible to design the drive of the non-uniformly translating gear so that a small torque must be applied. This torque is only used to transmit the laws of motion to be implemented by the non-uniformly translating gearbox to the output members. The forces required for operating the driven members associated with the working members are essentially realized by the working members acting on the working units, which are also controlled by the working members associated sensor units. In order for a transmission of torque fluctuations on the drive members of the non-uniform translating gearbox on the main drive of the sheet-processing printing machine is minimized or eliminated, so that a reduction in quality and effectiveness of the printing machine is avoided.

In one embodiment, the invention is explained in detail. In the accompanying drawings shows:

1 schematically the drive of grippers of a sheet-guiding cylinder and a pre-gripper designed as a cam gear non-uniformly translating gear,

2 schematically the drive of the pre-gripper by a trained as a crank gear non-uniform transmission gear.

From a partially shown arc-guiding cylinder 1 in 1 is a gripper 2 a gripper system shown. Bow-guiding cylinder 1 are formed in sheet-processing printing machines as a printing cylinder, transfer cylinder, Anlegezylinder or sheet reversing drums. They can be simply large or double-sized, with single-sized sheet-guiding cylinders 1 with a gripper system and double-sized bow-guiding cylinders 1 provided with two gripper systems. The gripper systems are each in a cylinder channel 3 of the sheet-guiding cylinder 1 intended. In the cylinder channel 3 extends in the axial direction of a gripper shaft 4 , the two sides in cheeks of the sheet-guiding cylinder 1 is received rotatably. With the gripper shaft 4 are rotatably the gripper 2 connected and spaced from each other across the width of the sheet-guiding cylinder 1 arranged. The grippers 2 are with claw tips 2.1 provided in the clamping position of the gripper 2 against one in the cylinder channel 3 provided gripper bar 5 be guided. For opening and closing the gripper 2 is outside the sheet-guiding cylinder 1 at a free end of the gripper shaft 4 as a roller lever 6.1 trained first output member 6 intended. First output member 6 / Roller lever 6.1 is non-rotatable with the gripper shaft 4 connected and stands by means of a cam roller 7 with a curve 8th , which is provided with a law of motion to be realized, in operative connection. The curve 8th is with a frame 9 connected and has a lower catch 10 and an upper rest 11 on. One on the first output element 6 / Roller lever 6.1 attacking compression spring 12 , which lean against the sheet-guiding cylinder 1 supports, holds the cam roller 7 engaged with the curve 8th , Upon rotation of the sheet-guiding cylinder 1 in one direction of rotation 13 follows the cam roller 7 the course of the frame 9 firmly connected curve 8th and the first output member 6 / Roller lever 6.1 following the laws of motion around the axis of rotation of the gripper shaft 4 pivoted. This movement of the first output member 6 / Roller lever 6.1 is from a first sensor unit 14 captured in a pivot 15 with the side wall of the sheet-guiding cylinder 1 connected and over a joint 16 with a bending stiff the first output member 6 / Roller lever 6.1 associated control member 17 is linked. The joint 16 can also directly with the first output member 6 / Roller lever 6.1 be connected.

The sensor unit 14 is through supply lines 18 with a central accumulator 19 connected to which a pressure generator 20 assigned. The first sensor unit 14 is still via control lines 21 with a first work unit 22 connected, which in the embodiment of a cylinder-piston unit 22.1 consists. The first work unit 22 / Cylinder-piston unit 22.1 is in the camp point 23 pivotable with the side wall of the sheet-guiding cylinder 1 connected and engages with a piston rod 24 on the first output member 6 / Roller lever 6.1 at.

Will be the bow-guiding cylinder 1 in the direction of rotation 13 turned, the cam roller runs 7 on the with the frame 9 firmly connected curve 8th and transfer that on the curve 8th imprinted law of motion on the first output member 6 / Roller lever 6.1 on the the gripper 2 as a working organ carrying gripper shaft 4 , The pressure spring must be 12 only be dimensioned so that the cam roller 7 safely engaged with the curve 8th is held. The movement of the first output element 6 / Roller lever 6.1 , initiated by the running of the cam roller 7 on the bend 8th , is from the first sensor unit 14 captured and with that of the pressure generator 20 in accumulator 19 provided as well as through the supply line 18 at the first sensor unit 14 applied pressure medium via the control lines 21 such the first work unit 22 / Cylinder-piston unit 22.1 charged to the function of the gripper 2 required force on the first output element 6 / Roller lever 6.1 is realized.

This can be minimized or eliminated moment feedback on the sheet-processing printing machine. The pressure generator 20 and the accumulator 19 are in the embodiment of the frame 9 intended. This is for supplying the pressure medium to the first sensor unit 14 in the supply lines 18 a rotary union required. But it is also possible, the pressure generator 20 and the accumulator 19 in the sheet-guiding cylinder 1 , z. B. in the cylinder channel 3 to provide. In this embodiment, it is necessary to provide a rotary feedthrough for power transmission and control power transmission.

The figurative representation continues to show the drive of a pre-gripper 27 a vibration system by means of a non-uniformly translating transmission, in which the drive member as a cam 25 with counter-curve 26 is trained. At the cam 25 runs a first role 28 and at the counter-curve 26 a second role 29 off, with the rollers 28 . 29 in one as a double roller lever 30.1 trained second output member 30 are included. The second output element 30 / Double roller lever 30.1 is with the help of a warehouse 31 in the frame 9 intended. Spatial conditions with the second output member 30 / Double roller lever 30.1 a control lever 32 rigidly connected by a swivel joint 33 a second sensor unit 34 assigned. The second sensor unit 34 is articulated in the frame 9 arranged and stands over the supply line 18 with the accumulator 19 in connection. Through the control line 21 is the second sensor unit 34 with a second work unit 35 / Cylinder-piston unit 35.1 connected, the pivoting in the frame 9 is stored. The piston rod 36 the cylinder-piston unit 35.1 is in the pivot point 37 with the control lever 32 connected and the free end on Vorgreifer 27 hinged. Through the rotating cam 25 This becomes the imprinted law of motion on the first role 28 on that as a double lever 30.1 trained second output member 30 and thus on the control lever 32 transfer. This movement of the second output member 30 is from the second sensor unit 34 captured and that through the supply lines 18 at the second sensor unit 34 applied pressure medium so the second unit of work 35 supplied by that for vibrating the Vorgreifers 27 required forces are realized. This can be repercussions of by operating the pre-gripper 27 occurring torque fluctuations and their reactions via the cam 25 be minimized or eliminated on the main drive. The sensor unit 34 is designed so that the imposed forces on the system are speed-dependent and these have a substantially square course to the machine speed.

In sheet-processing machines, it is known to use in addition to the cam gears as a non-uniform transmission gear and crank gear and crank gear for driving work organs. In 2 is a crank mechanism with a revolving drive crank 43 in the frame 9 is stored, shown. At the drive crank 43 picks up a paddock 38 on, with a third output member 39 connected, which as a swingarm 39.1 trained and in the frame 9 is received pivotally. With the third output element 39 is a link 40 connected, which at the Schwinger 27 attacks and by the non-uniform translating gear, the crank 43 , Paddock 38 and output member 39 / rocker 39.1 exists, generated movement history on the working element pre-gripper 27 transfers. Of course it is also possible, the paddock 38 directly at the pre-gripper 27 to steer and provide this as a driven member. With the third output element 39 / rocker 39.1 are articulated a third sensor unit 41 and a third unit of work 42 acting as a cylinder-piston unit 42.1 is formed, connected. The third sensor unit 41 and the third unit of work 42 are in the frame 9 pivotally mounted and through the control line 21 connected with each other. The third sensor unit 41 is still on the supply line 18 with the accumulator 19 and the pressure generator 20 connected.

The drive crank 43 runs steadily and drives the third output element 39 / rocker 39.1 oscillating at a given amplitude. This course of movement follows by means of the connecting link 40 the pre-gripper 27 , The third output member 39 / rocker 39.1 associated third sensor unit 41 detects the third output member 39 / rocker 39.1 imprinted course of movement and controls over the control lines 21 the loading of the third unit of work 42 / Cylinder-piston unit 42.1 in such a way with the printing medium, that for operating the pre-gripper 27 required forces are realized and so torque repercussions on the drive of the machine can be avoided.

In the embodiment, the working units 22 . 35 . 42 as cylinder-piston units 22.1 . 35.1 . 42.1 shown. It is also possible, instead of the cylinder-piston units 22.1 . 35.1 . 42.1 To provide rotation units such as rotary pistons or rotary blades.

LIST OF REFERENCE NUMBERS

1

 Sheet guiding cylinder

2

 grab

2.1

 hook tip

3

 cylinder gap

4

 gripper shaft

5

 Gripper bar

6

 First output member

6.1

 roller lever

7

 follower

8th

 Curve

9

 frame

10

 Lower rest

11

 Upper rest

12

 compression spring

13

 direction of rotation

14

 First sensor unit

15

 pivot point

16

 joint

17

 control member

18

 supply line

19

 accumulator

20

 pressure generator

21

 control line

22

 First work unit

22.1

 Cylinder-piston unit

23

 bearing point

24

 piston rod

25

 cam

26

 counter cam

27

 pregrippers

28

 First role

29

 Second role

30

 Second output member

30.1

 double lever

31

 stand point

32

 control lever

33

 swivel

34

 Second sensor unit

35

 Second work unit

35.1

 Cylinder-piston unit

36

 piston rod

37

 fulcrum

38

 paddock

39

 Third output member

39.1

 wing

40

 link

41

 Third sensor unit

42

 Third work unit

42.1

 Cylinder-piston unit

43

 drive crank

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4221929 C2 [0003]

Claims (7)

Control for work organs of a sheet-processing printing machine, wherein the drive of the working organs in each case by an output member ( 6 . 30 . 39 ) of a non-uniformly translating transmission, characterized in that the output member ( 6 . 30 . 39 ) a the course of movement of the output member ( 6 . 30 . 39 ) detecting sensor unit ( 14 . 34 . 41 ) associated with a likewise on the output member ( 6 . 30 . 39 ) attacking work unit ( 22 . 35 . 42 ) connected is. Control according to claim 1, characterized in that the working unit ( 22 . 35 . 42 ) as a cylinder-piston unit ( 22.1 . 35.1 . 42.1 ) is trained. Control according to claim 2, characterized in that the working unit ( 22 . 35 . 42 ) is designed as a rotation unit. Control according to claim 1, 2 or 3, characterized in that the working unit ( 22 . 35 . 42 ) is designed as a servo unit and by the signals of the sensor unit ( 14 . 34 . 41 ) is controlled. Control according to claim 1, characterized in that the sensor unit ( 14 . 34 41 ) with an accumulator ( 19 ) connected is. Control according to claim 5, characterized in that the pressure accumulator ( 19 ) with a frame ( 9 ) of the printing machine is connected. Control according to claim 5, characterized in that the pressure accumulator ( 19 ) in a gripper ( 2 ) carrying, circulating arc-guiding cylinder ( 1 ) is arranged.

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