DE8617025U1 - Device for driving a vibrating pre-gripper of a printing press - Google Patents

Description

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The invention relates to a device for driving an oscillating pre-gripper of a printing machine according to the preamble of the first patent claim.

Such devices are generally known and are described, for example, in DE-PS 2 220 343. A disadvantage is that drive parts that interact in a force-locking manner are provided to control the movement of the pre-gripper shaft. During operation, a lever arm is constantly pressed against a roller by means of a spring via a cam control. The components involved in the force-locking are inevitably subjected to very high loads by the large inertia forces caused by the high angular velocities and accelerations of the pre-gripper. A further disadvantage is that drive and output shafts are used to control the movement of the pre-gripper shaft, the center axes of which are arranged far apart, which also results in long gear link lengths and, as a result, high inertia forces. The latter also applies to a cam-drive-free drive of an oscillating pre-gripper, as is known from EP-A 0 006 402. In addition, complete pre-assembly of the pre-gripper is not possible with such devices. Final assembly and interchangeability are also made more difficult.

The invention is based on the object of providing, in a device of the type mentioned, positively interacting drive parts and a coaxial arrangement of the input and output shafts for initiating the additional movement, which is superimposed on the continuous rotary movement of the lifting pre-gripper eccentric.

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&idiagr; This object is achieved according to the characterizing part of the first patent claim. Further developments of the invention result from the subclaims, from the drawing and the description. The advantage of the invention is in particular that the inertia forces are minimized, at the same time the pre-assembly,

, the final assembly and the interchangeability of the device are improved.

,? The invention will be explained below with reference to the drawing

f 10 illustrated embodiments will be explained in more detail.

\ It shows: Fig. 1 the kinematic scheme of the device,

Fig. 2 a section through an embodiment

of the pre-gripper,

Fig. 3 a section through another version of the pre-gripper, 20

Fig. 4 is a schematic view of the control coupling 3.

Fig. 1 shows the kinematic diagram of a four-link kinematic chain, consisting of drive link 1, pre-gripper level 2, control link 3 and drag lever 4, which generate the required movement 24 of the pre-gripper level 2 by driving the drive link 1 mounted in the side stand 5 at a constant angular speed and the drag lever 4 pulling the cam rollers 6, 7, 8 arranged on the control link 3 via a triplet of associated cam disks 9, 10, 11 firmly screwed into the stand 5. The cam

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disks 9, 10, 11 are designed in such a way that the required movement 24 of the pre-gripper level 2 is achieved.

Figures 2 to 4 show various structural designs, which differ in the arrangement of the cam disc triple. Fig. 2 and 4 show a possible

Version with three external roller camshafts O. 10. 11

and Fig. 3 shows a design with two externally rolled cam disks 26, 27 and one internally rolled cam disk 12. The second design has the advantage of a lower overall height. For simplicity, identical components in the two designs are provided with the same reference numerals.

In both constructions, a pre-gripper shaft 16 is rotatably mounted on a center shaft 14, which is rotatably mounted in a housing shell 15 on the side stand 5. The control coupling 3 is arranged rotatably on 15 rolling elements 25 on a bearing body 13, which is firmly connected to the pre-gripper shaft 16. This is connected at the articulation point 17 to the relatively short rocker arm 4, which is eccentrically hinged in a gear 19 at the articulation point 18. The gear 19 and the eccentric shaft 14 form the drive member 1, with their center axes lying coaxially 20 to one another.
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The gear 19 is in constant engagement with a drive wheel 21 rotating with the pressure cylinder 20.

The control of the movement 24 of the pre-gripper shaft 16 is carried out by superimposing a circular movement - the radius of the circular path being determined by the size of the eccentricity, i.e. the distance of the center axis of the gear 19 from the center axis of the pre-gripper shaft 16 - with a fixed

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The general coupling movement controlled by the standing cam disk triplets 9, 10, 11 or 12, 26, 27, whereby the pre-gripper shaft 16 is given a swivel movement as an additional movement. The required movement 24 of the pre-gripper shaft 16 is shown in dashed lines in Fig. 1 as a movement of the pre-gripper plane 2. The timing ensures that the grippers 22 are in a rest position when the sheet is taken over from the feed table 23, that the sheet is transferred to the grippers (not shown) of the printing cylinder 20 at the same speed and that the jerking movement is terminated, during which the grippers 22 are removed from the printing cylinder 20 to the rest position _y <t and are gradually brought back to the starting position for the takeover of a new sheet.

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List of reference symbols

1 drive link

2 Pre-gripper level

3 Control coupling

4 rocker arms

5 side stands

6 Cam roller

7 Cam roller

8 Cam roller

9 Cam disc

10 Cam disc

11 Cam disc

12 Cam disc

13 Bearing body

14 Eccentric shaft

15 Housing shell

16 Pre-gripper shaft

17 Articulation point

18 Articulation point

19 Gear

20 printing cylinders

21 Drive wheel

22 grippers

23 Feeding table

24 required movement

25 rolling elements

26 Cam disc

27 Cam disc

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Claims (3)

«&bull;&bull;te« It «&bgr; c* »n M. A. N. - ROLAND Druckmaschinen Aktiengesellschaft Chrlstian-PleS-StraBe 6-30. 6050 Offenbach am Main Device for driving a swinging pre-gripper of a printing machine 1.) Device for driving a swinging pre-gripper I a printing machine in which an eccentric shaft is provided I which is rotatably mounted in the side stand of the machine and which rotatably accommodates a pre-gripper shaft, which ¹ 5 is influenced by a curve control, furthermore with the I Eccentric shaft is connected to a gear which is j- a drive gear rotating with the pressure cylinder it is in constant intervention, _T characterized by (■ 10 that the eccentric shaft (14) is mounted in a housing shell (15) on the . Side stand (5) and in the opposite side stand ! the machine is rotatably mounted so that the pre-gripper shaft i Ie (16) from a fixed to the stand (5) of the machine. I Triple of cam discs (9, 10, 11) over cam rollers I 15 (6, 7, 8) which is connected to a control coupling (3) I are arranged, which are rotatably mounted on the pre-gripper ^ shaft (16) and that a rocker arm (4) is articulated at a pivot point (17) on the control coupling (3), which is eccentrically mounted in the gear wheel at a further pivot point (18). 20 (19) is hinged. &bull; I III I ■ III t ltff I If It* IC III &bull; t · t It ■( 2.) Device according to claim 1, characterized in that a triplet of three externally rolled cam discs (9, 10, 11) is provided. 5 3.) Device according to claim 1, characterized in that a triplet of two externally rolled cam disks (26, 27) and one internally rolled cam disk (12) is provided. 11 * · I Ml« Il Il (Ii* * t * »IIIIII i I 41***11111111 i &igr; i · S &iacgr; { j · · !