EP0518034B1 - Oscillating roller for printing machines - Google Patents

Description

The present invention relates to a distributor roller for printing presses according to the preamble of claim 1.

Rubbing rollers are used in printing presses whenever the print image requires an uneven color distribution over the surface. The distribution rollers have both a favorable color-splitting and a favorable color-spreading effect.

DE-OS 29 35 014 a removable distributor roller in printing presses of the specified type has become known, which is driven by friction over its outer surface. A gear train drives a shaft of the distributor roller, which in turn drives a cam mechanism which serves to generate an axial reciprocating movement of the distributor roller.

A disadvantage of this distributor roller is that it can only be used as an distributor roller. So it is not switchable from oscillating movement to non-oscillating movement.

EP-PS 0 047 861 shows an oscillating ink application roller in which the oscillation stroke can be switched off. They are driven by friction.

The invention has for its object to provide a distribution roller for printing machines for the distribution of liquid or ink by means of drive by friction over the outer surface of the roller body, wherein the traversing stroke can be switched off and the roller can thus be used as a non-rotating ink transport roller.

According to the invention this object is achieved by the characterizing part of claim 1.

Due to the solution according to the invention, it is not necessary to remove the distributor roller for rubbing liquid or ink, but it can be used as a distributor or transport roller after the traversing stroke has been switched off. This will reduce the wear on the roller universally applicable and can be operated independently of the intervention of external gears.

By arranging the gear outside the distribution roller, the gear heat is better dissipated to the outside and, for these reasons, does not contribute to reducing the print quality.

By designing the gear housing with a coupling device in the form of a displaceable locking bolt, a safe and technically simple engagement of the traversing stroke is achieved. The locking bolt can be mounted in the gear housing as well as in the machine frame. The coupling device can advantageously also be implemented by a friction clutch attached to the machine frame. This makes it possible to switch on the traversing stroke via remote control while the distributor roller is in operation.

Advantageously, there are other technical possibilities for canceling the traversing stroke by interrupting the flow of force between the gear housing fixed to the frame and the distributor roller. For this purpose, for example, a known sleeve coupling can be used on the countershaft or on the axis between the distributor roller and the gear housing, as a result of which the aforementioned axes receive a separation point. The same effect is achieved if a gear of the double pinion is detachably attached to the countershaft by means of an index pin.

Fig. 1:

die schematische Seitenansicht eines Farb- und Feuchtwerkes einer Druckmaschine;

Fig. 2:

die schematische Darstellung der erfindungsgemäßen Verreibwalze;

Fig. 3:

die schematische Darstellung der Verreibwalze im Changierbetrieb als ausschnittweise Vergrößerung der Fig. 2;

Fig. 4:

die schematische Darstellung der Verreibwalze gemäß Fig. 3, jedoch in Ruhestellung.

The invention will be explained in more detail below using several exemplary embodiments. In the accompanying drawing:

Fig. 1:

the schematic side view of an inking and dampening unit of a printing press;

Fig. 2:

the schematic representation of the distribution roller according to the invention;

Fig. 3:

the schematic representation of the distributor roller in the traversing mode as a partial enlargement of FIG. 2;

Fig. 4:

the schematic representation of the distribution roller according to FIG. 3, but in the rest position.

1, the schematic side view of an inking and dampening unit of a printing press is shown.

A distribution roller 1 can be set within the roller train of the inking and dampening unit to any ink transport roller 2, application roller 3 or ink and dampening solution application roller 4.

However, it is also possible to equip the ink transport roller 2, application roller 3 or the ink and dampening solution application roller 4 shown in the drawing with the same characteristics of the distribution roller 1 according to the invention.

2, the distribution roller 1 is on a rotatable axis 6, which in ball bearings 7; 8 is stored. The ball bearing 7 is designed as a fixed bearing and the ball bearing 8 as a load bearing, and both ball bearings 7; 8 are held in roller locks via bearing arms 10 in the sides of the frame 9; 11 adjustable attached. The distribution roller 1 is rotatably and changeably mounted on needle bearings 13. On one end of the distribution roller 1 is centered by means of screws 14 Axis 6 fixed a gear 16. A rotatable gear housing 18 is fastened on the needle bearing 12 and a ball bearing 17 located on the axis 6. In the gear housing 18, a double pinion 19 is rotatable on a countershaft 21 in bearings 22; 23 stored. The double pinion 19 engages on the one hand in the gear 16 and on the other hand in the gear 24 fixedly connected to the axis 6. The gears 16 and 24 have a different number of teeth. However, it is also possible for the gears 16; 24 to equip with the same number of teeth and to design the number of teeth of the pinion of the double pinion 19 differently. The gear housing 18 can be locked against the side of the bearing arm 10 by means of a coupling. The lock can also be made against the frame 9.

3 and 4, the coupling consists of a locking bolt 27 fastened in a slide 26, which can be moved in a guide 28 against an abutment 29 fastened to the frame 9 in the direction of arrow A. The slider 26 has a handle 31, for example a handle, which is guided through an elongated hole 32 of the gear housing 18 and can be actuated in the direction of arrow A. In order to set the different operating modes shown in FIGS. 3 and 4, the slide 26 of the locking device is provided with two recesses 33; 34 provided, in which the handle 31 optionally engages against the spring force of a ball grid 36 consisting of ball and compression spring. The state of fixing the gear housing 18 against the frame 9 shown in FIG. 3 can also be achieved by a symbolically illustrated friction clutch 35 which is fastened to the frame 9 and which can be actuated mechanically, magnetically, pneumatically, hydraulically or electrically against the gear housing 18.

In extension of the locking pin 27, the slider 26 also has a locking pin 27 ', which can be moved by a guide 28' attached to the gear housing 18 in the direction of arrow A against an abutment 29 'attached to the gear 16. The abutment 29 'can for example be designed as a bore in the gear 16.

On the other end of the distribution roller 1, two traversing curves 37; 38 attached, which are aligned by a spacer sleeve 39 and fixing pins, not shown, in distance and position. At the traversing curves 37; 38 is a cam roller 41; 42 on, which are fixed by clamping screws 43 in the axis 6. On the end faces of the distributor roller 1, an annular thermal insulation 44 is attached coaxially to the axis 6, which can consist, for example, of plastic and which runs parallel to the axis 6 in its direction of action.

The way it works is as follows. When the distributor roller 1 is driven by friction on its roller body and the locking device is in the position shown in FIG. H. the locking pin 27 is in operative connection with your abutment 29, then the gear housing 18 is at rest. The axis 6 then rotates at a speed n2 deviating from the speed n1 of the distribution roller 1. The speed difference between n1 and n2 is the traversing curves 37; 38 and the cam rollers 41; 42 generates the traversing movement of the distribution roller 1.

If the handle 31 is in the position shown in FIG. 4 brought, then the locking pin 27 'comes into contact with the abutment 29' on the gear 16. Thus, the distributor roller 1, the gear housing 18 and axis 6 rotate in the ball bearings 7; 8 with the same speed. There is no traversing movement.

The position of locking the gear housing 18 to the abutment 29 'shown in FIG. 4 is, however, only for safety reasons, since only the detachable connection according to FIG. 3 has to be released in order to switch off the traversing stroke, since the frictional resistance of both the spur gear and the cam mechanism are one Traversing stroke does not allow. The traversing stroke only occurs when the gear housing 18 is fixed against the frame 9.

Furthermore, there is the possibility of canceling the traversing stroke by interrupting the flow of force between the gear housing 18 fixed on the frame 9 and the distribution roller 1. For this purpose, for example, a known socket coupling 40 on the countershaft 21 or a socket coupling 45 on the axis 6 can be used. The same effect is achieved if a gear wheel of the double pinion 19 is detachably attached to the countershaft 21 with an index pin 46 (not shown). The index bolt or index pin 46 is cylindrical and can be locked in a standardized drill bushing by means of a handle, not shown. The handle can be led out of the gear housing 18. In general, it can be said that a large number of switchable non-positive or positive couplings can be used as the coupling device.

Parts list

1

Distribution roller

2nd

Ink transport roller

3rd

Applicator roller

4th

Ink and dampening roller

5

Distribution cylinder

6

axis

7

ball-bearing

8th

ball-bearing

9

frame

10th

Bearing arm

11

frame

12th

Needle bearing

13

Needle bearing

14

screw

15

-

16

gear

17th

ball-bearing

18th

Gear housing

19th

Double pinion

20th

-

21

Counter axis

22

camp

23

camp

24th

gear

25th

-

26

Slider

27

Locking bolt

27 '

Locking bolt

28

guide

28 '

guide

29

Abutment

29 '

Abutment

30th

-

31

Handle

32

Long hole

33

Recess

34

Recess

35

Friction clutch

36

Ball snapper

37

Traverse curve

38

Traverse curve

39

Spacer sleeve

40

Socket coupling

41

Cam roller

42

Cam roller

43

Clamping screw

44

Thermal insulation

45

Socket coupling

46

Index pen

A

Arrow direction

Claims (14)

1. A removable distributing roller for a printing machine, the distributing roller being arranged such that it is drivable by frictional connection with an outer surface of another roller, taking on the rotary movement of the other roller, being mounted such that it is rotatable in mountings fixed to the side frame, having a cam gear for generating an axial to-and-fro movement of the distributing roller, a wheel gear which is mounted in a gear housing and drives the cam gear, for generating a driving speed for the input to the cam gear, being provided, characterized in that the gear housing (18) is arranged selectively fixed to the frame, transmitting the driving speed to the cam gear (37, 38, 39, 41, 42, 43) for generating the axial to-and-fro movement, or capable of being made inactive, fixed to the distributing roller.
2. A distributing roller according to Claim 1, characterized in that coupling means (40; 44, 45) for interrupting the flow of force from the distributing roller (1, 14) by way of the wheel gear (6, 16, 17, 19, 21, 22, 23, 24) to the cam gear (37, 38, 39, 41, 42, 43) are provided for generating the axial to-and-fro movement when the gear housing (18) is established fixed to the frame.
3. A distributing roller according to Claim 2, characterized in that the coupling means (40; 44, 45) are constructed as a form-fitting coupling.
4. A distributing roller according to Claim 2, characterized in that the coupling means (40; 44, 45) are constructed as a force-fitting coupling.
5. A distributing roller according to Claims 2 to 4, characterized in that the cam gear (37, 38, 39, 41, 42, 43) for generating the axial to-and-fro movement has a toothed wheel (16) connected to the distributing roller (1) and in engagement with a double pinion (19) located on an idler shaft (21), the double pinion (19) simultaneously being in operative connection with a toothed wheel (24) fixedly connected to a shaft (6).
6. A distributing roller according to Claims 1 to 5, characterized in that a switchable fixing means (26, 27, 28, 29, 29', 31, 33, 36; 35) is provided for fixing the gear housing (18) with the wheel gear (6, 16, 17, 19, 21, 22, 23, 24) to the frame (9).
7. A distributing roller according to Claims 1 to 6, characterized in that a friction coupling (35) is provided as the switchable fixing means (35) with the wheel gear (6, 16, 17, 19, 21, 22, 23, 24).
8. A distributing roller according to Claims 1 to 7, characterized in that, as the fixing means, a latching pin (27) is secured in a sliding piece (26) which has a cutout (34) in which, in opposition to the force of a spring, the ball of a ball catch (36) can be brought into engagement, and in that the sliding piece (26) has a handle (31) which projects out of the gear housing (18) through an elongate hole (32).
9. A distributing roller according to Claims 1 to 8, characterized in that, as the connection for the latching pin (27) when the wheel gear (6, 16, 17, 19, 21, 22, 23, 24) is fixed on the roller side, there is provided a latching pin (27') which is mounted in the gear housing (18) and is arranged such that it is axially displaceable with respect to an abutment means (29') secured to a flange of the toothed wheel (16) or to the end face of the distributing roller (1).
10. A distributing roller according to Claims 1 to 9, characterized in that when the means (26, 27, 28, 29, 29', 31; 33, 36; 35) for fixing the gear housing (18) to the frame (9) is opened, as the coupling for interrupting the flow of force from the wheel gear (6, 16, 17, 19, 21, 22, 23, 24) there is provided a cam gear (16; 19; 21; 24) for generating the axial to-and-fro movement of the distributing roller (1) and the frictional resistance of this gear for generating the axial movement (37; 38; 39; 41; 42).
11. A distributing roller according to Claims 1 to 10, characterized in that, as the means for fixing the gear housing (18) to the frame (9), a toothed wheel of the double pinion (19) is mounted such that it is rotationally fixed on the idler shaft (21) by means of a removable form-fitting connection.
12. A distributing roller according to Claims 1 to 10, characterized in that, as the detachable form-fitting connection (27), a reference pin (46) is provided.
13. A distributing roller according to Claims 1 to 10, characterized in that, as the detachable form-fitting connection (27), a multiple-spline bushing or a sleeve coupling (40; 45) is provided.
14. A distributing roller according to Claims 1 to 13, characterized in that the gear housing (18) and the wheel gear (6, 16, 17, 19, 21, 22, 23, 24) for generating the axial movement is arranged axially spatially separated from the distributing roller (1).

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