DE102013018921A1 - Device for elastically driving a gear - Google Patents

Abstract

In a device for coupling two parallel arranged drive wheels of a cylinder of a sheet-processing machine, it is provided to provide a driver, which has a main direction of rotation of the cylinder acting first compression spring and an oppositely acting second compression spring.

Description

The invention relates to a device for driving a gear by means of a parallel drive wheel, which is connected by means of an elastic driver with the gear.

When engaging and disengaging gears in gear trains, especially in sheet-processing machines, z. As printing machines, high torque shocks are generated, which can have a doubling result.

By the DE 19715026 A1 is an elastic drive for reducing torque surges known, which has elastic drivers between two parallel drive wheels to transmit torques can. The driver consists of a spring loaded transmission pin.

The invention has for its object to provide a driver which absorbs a torque shock in both directions of rotation.

The object is achieved by the features of claim 1.

It is a particular advantage of the invention that the elastic driver can deflect in the operating direction at a peak load. By this measure, torque shocks are minimized. For this purpose, the elastic driver on a preloaded spring whose main spring force is greater than the torque applied in the normal pressure operation.

At a peak load caused by a pressure shift shock, the main spring can deflect. When rebounding the main spring acts against a second compression spring with less force and bias. By this measure, the force pulse is minimized in the reverse direction. The springs are preferably designed as disc springs.

Further advantageous embodiments are described in the subclaims.

An embodiment of the invention is illustrated in the drawings and will be described below. Show it

1 a sheet-fed rotary printing press in section in a schematic representation

2 Drive wheels of a printing unit in section in a schematic representation

3 a section through the drive wheels of a cylinder in a schematic representation

4 a cross section through a drive wheel of a cylinder in the neck

A bow 7 processing machine, z. B. a printing press 1 , indicates a feeder 2 , at least one printing unit 3 respectively. 4 and a boom 6 on. The bows 7 be from a sheet pile 8th taken and isolated or flaky about a feed table 9 the printing units 3 and 4 fed. These contain a plate cylinder in a known manner 11 . 12 , The plate cylinders 11 and 12 each have a device 13 . 14 for attaching flexible printing plates. In addition, every plate cylinder is 11 . 12 a device for semi or fully automatic printing plate change 16 . 17 assigned.

The sheet pile 8th lies on a controlled liftable stacking plate 10 on. The removal of the bow 7 takes place from the top of the sheet pile 8th by means of a so-called suction head 18 , which includes a number of lifting and towing suits 19 . 21 for singling the bow 7 having. In addition, blowing devices are provided for loosening the upper sheet layers of the scanning elements for stack tracking. To align the sheet pile 8th , especially the upper arch 7 of the sheet pile 8th a number of side and rear stops are provided.

The plate cylinders 11 and 12 the printing works 3 and 4 are in contact with each with a blanket cylinder 15 ; 20 which ink or varnish on one of the printing cylinders 22 . 23 transported bows 7 transfers. The printing works 3 and 4 are identical, so that the device only on the basis of a printing unit 4 is described.

2 shows a drive wheel train with a drive wheel 24 of the printing cylinder 22 , a drive wheel 26 the blanket cylinder 15 and a drive wheel 27 of the plate cylinder 12 ,

In the embodiment, the blanket cylinder 15 for setup and service work by a pivoting movement (dashed line) auskuppelbar arranged from the drive wheel train.

The plate cylinder 12 according to 3 parallel to the drive wheel 27 arranged another drive wheel 28 on. While the drive wheel 27 on a shaft journal 29 of the plate cylinder 12 is rotatably mounted, is the drive wheel 28 firmly with the plate cylinder 12 connected. The drive wheels 27 . 28 are by means of at least one elastic driver 31 coupled together. The driver 31 is on the rotatably mounted drive wheel 27 of plate cylinder 12 attached and protrudes into a recess 32 in the drive wheel 28 into it. The driver 31 has the shape of a bolt 33 on whose axis A parallel, tangential to the circumference of the drive wheel 28 is arranged. The bolt 33 has a waistband in the middle 34 on, in which direction of rotation (see arrow in 3 ) of the drive wheel 28 and thus the plate cylinder 12 , a big spring 36 is supported and on the other side of the covenant 34 in operating position a small compression spring 37 is supported. The compression springs 36 . 37 are designed as disc springs and each by means of a pressure plate 38 ; 39 under tension on the bolt 33 arranged.

In operating direction of rotation (see arrow in 3 ) of the drive wheel 27 which of the gear 26 the blanket cylinder 15 is driven, the at the drive wheel 27 fastened drivers 37 with the pressure disk 38 against a paragraph 41 of the drive wheel 28 pressed. The force of the diaphragm spring 36 is designed so large that they can be brought together only at peak loads that are above an operating torque and thus can deflect.

When rebounding the compression spring 36 an overshoot occurs against the force of the small compression spring 37 , in turn, on the drive wheel 28 supported pressure disk 39 is supported. The support of the pressure disc 39 takes place at a paragraph 42 of the drive wheel 28 ,

The drive wheels 27 . 28 are designed as gears.

To drive other printing rollers is the drive wheel 28 in mesh with a drive gear 43 a paint or dampening drive train.

When installing the plate spring 36 preloaded with a force FT ₁ . In normal printing operation becomes the driver 33 loaded with the pressure load F _D.

The smaller with a force FT ₂ biased plate spring 37 expresses inter alia a game from the connected parts. The forces are chosen so that (FT ₁ >> F _D + FT ₂ ), ie the force FT _{1 of} the diaphragm spring 36 is much larger than the force FT ₂ + F _{D of} the diaphragm spring 37 and the pressure force.

A force resulting from the forces (FT ₁ - FT ₂ ) differential force is in the idle state via a on the driver ( 31 ) arranged stop ( 35 ), z. B. Seegering and the Bund ( 34 ) supported.

In normal printing operation, the driving clutch reacts 31 thus stiff, since the operating load F _{D is} not sufficient to the diaphragm spring 36 to be deflected.

At a pressure surge (peak load) springs the diaphragm spring 36 one. The plate spring 36 then presses with decaying force of the shock pulse back to the starting position. Through the small plate spring 37 However, this does not happen abruptly, but sprung accordingly. This also reduces a force pulse in the opposite direction.

LIST OF REFERENCE NUMBERS

1

press

2

investor

3

printing unit

4

printing unit

5

./.

6

boom

7

bow

8th

sheet pile

9

feed

10

stacking plate

11

plate cylinder

12

plate cylinder

13

Printing plate mounting

14

Printing plate mounting

15

./.

16

Printing plate changer

17

Printing plate changer

18

suction head

19

lifting sucker

20

./.

21

pull suckers

22

pressure cylinder

23

pressure cylinder

24

Drive wheel ( 22 )

25

./.

26

Drive wheel ( 15 )

27

Drive wheel ( 12 )

28

Drive wheel ( 12 )

29

Shaft journal ( 12 )

30

./.

31

takeaway

32

recess

33

bolt

34

Federation

35

circlip

36

Compression spring (FT ₁ )

37

Compression spring (FT ₂ )

38

Thrust washer ( 36 )

39

Thrust washer ( 37 )

40

./.

41

Paragraph ( 32 )

42

Paragraph ( 32 )

A

Axis ( 33 )

FT ₁

Force ( 36 )

FT ₂

Force ( 37 )

F _D

thrust

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 19715026 A1 [0003]

Claims (9)

Device for elastically driving a drive wheel of a cylinder of a sheet-processing machine by means of a coupling arranged between two parallel drive wheels of this driver, characterized in that the driver ( 31 ) one in a main direction of rotation of the cylinder ( 12 ) acting first compression spring ( 36 ) and a second compression spring acting in the opposite direction ( 37 ) having. Device according to claim 1, characterized in that the compression spring ( 36 ) by means of a stop ( 35 ) on the driver ( 31 ) is supported. Apparatus according to claim 1 or 2, characterized in that the driver ( 31 ) a circumferentially arranged bolt ( 33 ). Device according to claim 3, characterized in that the bolt ( 33 ) a covenant ( 34 ) and that the compression springs ( 36 . 37 ) on this covenant ( 34 ) are arranged supported. Device according to claim 4, characterized in that each compression spring ( 36 . 37 ) a pressure disk ( 38 ; 39 ) and by means of this in a recess ( 32 ) on the drive wheel ( 28 ) is supported. Device according to one of the preceding claims, characterized in that the compression springs ( 36 . 37 ) are designed as disc springs. Device according to one of the preceding claims, characterized in that the first compression spring ( 36 ) is biased with a force (FT ₁ ) and that the second compression spring ( 37 ) is biased with a smaller force (FT ₂ ) than the first force (FT ₁ ). Apparatus according to claim 7, characterized in that the first force (FT ₁ ) is substantially greater than the sum of the second force (FT ₂ ) plus a compressive force (F _D ), which arises in the printing operation by a drive torque. Printing unit with a device according to one of claims 1 to 8.

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