DE19650012A1 - Gripper actuation system - Google Patents

Abstract

A gripper actuating system for printers is disclosed. The object of the invention is to provide a gripper actuating system for printers fitted with several rows of grippers and in which a sheet is supplied only to every second row of grippers and discharged only from every second row of grippers. This object is attained in that a fixed gripper actuating cam (11) which co-operates with first rollers (22) of roller levers (10) to actuate the grippers located in rows (3) of grippers (3) is associated to a locking segment (24) having locking surfaces, turning at the speed of rotation of the cylinder and co-operating with second rollers (23) of the roller levers (10).

Description

The invention relates to a gripper actuation system for Druckma seem.

Printing machines are known (DR 435 592) which have a triple large pressure cylinder with three pressure calipers and three rows of grippers have, the pressure cylinder with a double-sized off setting cylinder with two blankets and this with a double the large printing plate cylinder together with two printing plate saddles works. The printing form cylinder are two alternately with the Bring two printing forms of the printing form cylinder into active connection assignable inking and dampening units.

To produce a multi-color print, two turns of the Printing cylinder required, only every second print saddle fed from a feeder a sheet.

Furthermore, only every second printing saddle is printed ter bow removed by a discharge device.

The object of the invention is to create a gripper actuation systems for printing presses with several rows of grippers, whereby only one sheet is fed to every second row of grippers and only from each a second row of grippers a bow is removed.

According to the invention the object is achieved by the patent claim.

The invention is explained in more detail below using an exemplary embodiment described.

In the drawing shows

Fig. 1 printing press

Fig. 2 gripper actuation system

Fig. 3 sheet feed to the 1st row of grippers

Fig. 4 sheet removal from the second row of grippers

Fig. 5 sheet feed to the second row of grippers

Fig. 6 sheet removal from 3rd row of grippers

Fig. 7 sheet feed to the 3rd row of grippers

Fig. 8 sheet removal from 1st row of grippers.

In Fig. 1 is a printing press with a printing cylinder 1 with three printing surfaces 2.1 ; 2.2 ; 2.3 and three gripper rows 3.1 ; 3.2 ; 3.3 shown.

The pressure cylinder 1 interacts with two offset cylinders 4 . Each offset cylinder 4 is provided with two active surfaces 9.1 ; 9.2 equipped.

Thus, the pressure cylinder 1 has i effective areas i + 1 pressure areas in relation to the offset cylinder 4 . The offset cylinder 4 rotates at the speed n _O = 1 and the impression cylinder 1 at the speed n _D = 2/3.

A sheet feeder 5 , for example a pre-gripper, is assigned to the printing cylinder 1 .

The sheet transfer point sheet feed / impression cylinder is identified with the reference number 6 .

The printing cylinder 1 is still a sheet discharge 7 zugeord net. The sheet transfer point printing cylinder / sheet discharge is identified by the reference number 8 .

In Fig. 2 the pressure cylinder 1 is shown with the gripper actuation system.

Each row of grippers 3 is in each case connected to a roller lever 10 .

Each roller lever 10 is with two rollers 22 ; 23 equipped. The respective first roller 22 is in operative connection with a fixedly arranged on the frame 20 gripper actuating cam. 11

The respective second roller 23 is operatively connected to a circumferential locking segment 24 . The locking segment 24 rotates at the speed of the offset cylinder 4 , ie when the speed of the locking segment 24 1 is set (n _S = n _O = 1), the speed of the pressure cylinder is 2/3 (n _D = 2/3).

The locking segment 24 is rotatably mounted for this purpose on the axis of the pressure cylinder 1 and provided via a fixed to the locking segment 24 gear 25 , which is operatively connected to a fixed to the offset cylinder 4 not shown th gear provided.

If the first roller 22 of one of the roller levers 10 is located on the high stroke 12 of the gripper actuation curve 11 ( FIG. 3), ie on the circular arc, the grippers of the gripper row 3 assigned to the respective roller lever are closed. If the first roller 22 of one of the roller levers 10 is located on the low stroke 13 , the grippers of the gripper row assigned to the respective roller lever are open. The gripper opening point is marked with the reference numeral 14 and the gripper row closing point with the reference symbol 15 .

The gripper row opening point 14 is assigned to the sheet transfer point 8 and the gripper row closing point 15 is assigned to the sheet transfer point 6 .

The locking segment 24 is equipped with a stroke which corresponds to the high stroke 12 of the gripper actuation curve 11 .

The rotating blocking segment 24 has the task of keeping the grippers of the respective gripper row closed during the second circulation of the sheet to be printed in the area between the sheet transfer point 8 and the sheet transfer point 6 , that is to bridge the low stroke 13 of the gripper actuation curve 11 and thus prevent a gripper opening.

The curve angle α of the blocking segment 24 corresponds to half the frame angle β between the sheet transfer point 6 and the sheet transfer point 8 .

The mode of operation of the inventive solution is described below with reference to FIGS. 3 to 8.

In Fig. 3, a first sheet 16 to be printed is transferred from the sheet feeder 5 at the sheet transfer point 6 to the first row of grippers 3.1 . The first roller 22 of the roller lever 10.1 moves from the low stroke 13 to the high stroke 12 and the grippers of the first row of grippers 3.1 are closed; the second roller 23 of the roller lever 10.1 has no contact with the locking segment 24 . A second and third sheet 17 to be printed; 18 is in the phase shown in FIG. 3 on the two remaining pressure surfaces 2.2 ; 2.3 of the printing cylinder 1 , wherein the second row of grippers 3.2 and the second sheet 17 passes the sheet transfer point 8 without a gripper opening. This is because the second roller 23 of the second roller lever 10.2 is in operative connection with the locking segment 24 .

In FIG. 4, the second phase of the movement sequence is shown. The earlier supplied second sheet 17 passes with its beginning the sheet transfer point 6 , the grippers of the second row of grippers 3.2 remain closed and no sheet is taken over. In order to prevent sheet transfer from the sheet feeder 5 , the second roller 23 , as already described in the first phase, ran on the blocking segment 24 . The beginning of the supplied third sheet 18 has passed the sheet transfer point 8 and has been transferred to the sheet discharge 7 . The first roller 22 of the third gripper row 3.3 is on the low stroke 13 and the gripper fer of the third gripper row 3.3 is open.

In Fig. 5 is the third phase of the movement sequence which corresponds to the loading motion sequence of the first phase, is shown.

A fourth sheet 19 is transferred to the third row of grippers 3.3 in the sheet transfer point 6 and the first sheet 16 passes the sheet transfer point 8 without a gripper opening, since the locking segment 24 is assigned to the second roller 23 of the first roller lever 10.1 .

In FIG. 6, the fourth phase of the movement sequence is shown. The first gripper row 3.1 with the first sheet 16 passes the sheet transfer point 6 , since the locking roller 24 was assigned to the second roller 23 of the first roller lever 10.1 , without gripper opening and the second sheet 17 is from the opened grippers of the second row of grippers 3.2 to the sheet discharge 7 passed.

The fifth phase of the movement sequence is shown in FIG. 7. The fourth sheet 19 passes the sheet transfer point 8 without gripper opening (effect of blocking segment 24 ) and a fifth sheet 20 is transferred to the open grippers of the second row of grippers 3.2 .

In FIG. 8, the sixth phase of the movement sequence is shown. In this sixth phase, the first sheet 16 fed to the printing cylinder 1 of the sheet discharge 7 is transferred in the first phase.

Reference list

1

Impression cylinder

2nd

Printing area

2.1

first printing area

2.2

second printing area

2.3

third printing area

3rd

Row of grippers

3.1

first row of grabs

3.2

second row of grabs

3.3

third row of grabs

4th

Offset cylinder

5

Sheet feeder

6

Arc takeover point

7

Sheet discharge

8th

Arc transfer point

9

Effective area

9.1

first effective area

9.2

second effective area

10th

Roller lever

10.1

first roller lever

10.2

second roller lever

10.3

third roller lever

11

Gripper actuation curve

12th

high stroke

13

low stroke

14

Gripper row opening point

15

Gripper row closing point

16

first bow

17th

second bow

18th

third arch

19th

fourth arch

20th

fifth arch

21

frame

22

first role

23

second role

24th

Blocking segment

25th

gear
n _p

Lock segment speed
n _D

Speed printing cylinder
n _o

Speed offset cylinder
α curve angle
β frame angle

Claims (2)

1. Gripper actuation system for printing cylinders with i + 1 printing surfaces and rows of grippers, which interacts with at least one cylinder designed as a printing form or offset cylinder with i active surfaces and a sheet feeder and sheet discharge from every second row of grippers, characterized in that one is stationary arranged, with first rollers 22 ) of roller levers ( 10 ) for actuating the grippers of gripper rows ( 3 ) cooperating gripper actuation curve ( 11 ) with the speed of the cylinder ( 4 ) with i active surfaces revolving locking segment ( 24 ) which with second rollers ( 23 ) the roller lever ( 10 ) is in operative connection, is assigned. 2. Gripper actuation system for pressure cylinder according to claim 1, characterized in that the curve angle α of the Sperrseg element ( 24 ) corresponds to half the frame angle β between the arc takeover and transfer point ( 6 ; 8 ).