EP1125734A1 - Driving device for printing cylinders - Google Patents

Abstract

A printing press including a printing cylinder and a printing cylinder drive, the drive including a drive motor connected to a sun gear, a planet gear rotating about a fixed axis and driven by the sun gear, and a ring gear fixedly attached to the printing cylinder and driven by the planet gear. Also provided is a method for driving a printing cylinder comprising the steps of driving a sun gear using a drive motor, the sun gear driving a planet gear and a ring gear, the ring gear being fixedly attached to the printing cylinder.

Description

The present invention relates to a device for driving Printing unit cylinders in a printing press according to the preamble of claim 1.

On the printing unit cylinders of printing machines, a printing material, e.g. B. paper, printed. In web offset printing, the printing unit cylinders comprise a plate cylinder and a blanket cylinder. A printing plate mounted on the plate cylinder contacts the blanket mounted on the blanket cylinder while one Material web or a sheet of material between the rubber blanket and one Counter pressure cylinder is passed through. In doing so, ink is applied via inking rollers applied the plate cylinder and the thus colored image on the rubber blanket and from transferred there to the web or the arch. For printing on both sides of the web the impression cylinder can be designed as a further blanket cylinder.

The plate cylinder and the blanket cylinder are made by one on the drive side the printing machine arranged drive mechanism, which is usually a Gearbox for driving the individual printing cylinder includes. The Drive mechanism can be over a single engine or over multiple engines are driven. Hitachi-Seiko machines, for example, have one Two-motor drive for driving two printing unit cylinders in a four-cylinder printing unit. Heidelberg Web Press, Inc. machines have one Three-motor drive for driving three printing unit cylinders in a four-cylinder printing unit.

To avoid winders in the event of web breaks in web-fed printing machines or It is often necessary to change plates or blankets; the plate cylinder from Put the blanket cylinder or the blanket cylinder off the impression cylinder. The mechanisms by which the printing couple cylinders are moved are called and called shutdown mechanisms.

Because the plate cylinder and the blanket cylinder are rotated further in the parked state must remain connected to the drive mechanism.

US 4,309,954 describes a drive for a printing couple cylinder in one Flexographic printing machine, in which the printing unit cylinder carrying the printing plate over a planetary gear is driven by a main drive. Due to the Design of the planetary gear with two opposite one another in one It is internal ring gear arranged, supported on a sun gear planet gears not possible with the described planetary gear, the pressure plate cylinder from turn off adjacent printing unit cylinder without the entire planetary gear as to move such and the main drive shaft leading to the planetary gear, or to design it to be angularly movable in a complex manner.

US 4,953,461 describes a device for register adjustment of Printing unit cylinders in which the register adjustment as such by means of a so-called Harmonic-Drive drive takes place, which with the drive pin of the pressure plate cylinder coupled and provided on the outside with a drive sprocket. The Drive sprocket is rotated by a drive motor, not shown and in turn drives an associated drive gear for the assigned one Blanket cylinder, which on a corresponding journal of the Blanket cylinder is attached. The axle pin of the rubber blanket cylinder is exaggerating a drive shaft to a sun gear of a planetary gear, which in turn Drive gears are coupled to an input shaft of the harmonic drive drive, to make them spin. The scripture gives no indication that Plate cylinder or the blanket cylinder through a planetary gear through To drive the main drive motor.

In US 5,678,485 is an offset printing machine with a counterweight and Lifting mechanism described. The counterweight is designed to be axial Pull a blanket or printing plate sleeve onto a respective cylinder enable. The lifting mechanism is a parking mechanism which, for. B. for parking of the plate cylinder is used. There is no drive mechanism in this document described.

In US 3,724,368 is a drive mechanism and a parking mechanism for one Offset printing machine described. A harmonious drive means enables Register adjustment of both plate cylinders. The main drive of the printing press is one Motor that is connected to one of the blanket cylinders.

The press manufacturer MAN Roland uses a direct drive for one Blanket cylinder. The engine is moved during the shutdown and drives the Blanket cylinder in a ratio of 1: 1.

A problem with the devices described is that the motors for Driving the cylinders are very large and take up a lot of space, and often only are difficult to adjust. The engines also frequently need to be turned off during shutdown can be moved together with the cylinders, creating a complicated, very elaborate Arrangement arises.

The object of the present invention is to use smaller drive motors for printing unit cylinders and the operation of drive motors with higher ones To allow speed. Another or alternative task is one to allow the engine to be arranged in a stationary manner even when the cylinders are switched off.

This object is achieved by the features of claim 1. Further features of the invention are contained in the subclaims.

A device according to the invention for driving printing unit cylinders in one Printing press includes a motor that is connected to a sun gear Planet gear that rotates around a fixed planet gear axis and that of the sun gear is driven, and an inner ring gear, which is attached to the printing unit cylinder and from Planet gear is driven.

The planetary gear according to the invention enables the use of motors with higher ones Speed because the sun gear rotates at a higher rotational speed than the internal ring gear. In this way, a lower inertia ratio remains on the motor receive. The higher engine speed makes the electronic better Control of the speed of the printing unit cylinder possible.

The printing unit cylinder is preferably a blanket cylinder or a Plate cylinder of an offset printing machine.

Furthermore, the printing couple cylinder is preferably in a first position and in a second position movable, z. B. in the first position by one Print job and the second position is a print job. The motor preferably remains in both the first position and the second position. the printing unit cylinder in the same position, while the inner ring gear with the Printing cylinder is moved, but continues to mesh with the planet gear, d. H. in Meshing is.

The use of a fixed motor is extremely advantageous because the cylinder is switched off is simplified if the motor does not have to be moved.

The device according to the invention preferably further comprises a switch-on and switch-off mechanism which is connected to the printing group cylinder and which comprises a pivotable lever for moving the printing group cylinder.
The printing unit cylinder can be designed as a conventional cylinder having a channel or as a cantilevered cylinder which has a sleeve, such as. B. carries a canal blanket or a canal-free printing plate, which over the free end of the printing unit cylinder, for. B. using blown air, can be pushed axially onto this.

The gear ratio of the planetary gear is preferably 4: 1, i. H. the sun gear and the motor preferably rotates at four times the speed of rotation Internal ring gear and the printing unit cylinder.

The printing unit cylinder can preferably be a plate cylinder Offset printing machine, which further comprises a blanket cylinder, the one via a drive gear connected to the inner ring gear and one with this connected driven gear, which is attached to the blanket cylinder, driven becomes. If the blanket cylinder and the plate cylinder are the same size, that has Drive gear and the driven gear preferably also the same size.

The planet gear preferably comprises a device for avoiding gear play in gears. In order to minimize gear wheel play, in particular a side gear arrangement can be used be used.

The motor can be arranged in such a way that it is axially displaceable and with a spiral gear is coupled to a movement in the circumferential direction Allow register setting. Alternatively, the circumferential register can also be accessed via the Drive motors can be set.

The features of the present invention will become apparent in the following description preferred embodiments in connection with the attached, below listed drawings explained in more detail.

Show it:

Fig. 1

a partial, schematic plan view of an embodiment of the present invention;

Fig. 2

is a schematic side view of the drive gear shown in Fig. 1 Embodiment;

Fig. 3

the drive gear shown in Fig. 2 after turning off the Printing unit cylinder; and

Fig. 4

a schematic representation of a parking lever, as in connection with the embodiment shown in Fig. 1 can be used.

1 shows a partial top view of an offset printing press 1 with a drive-side frame 2, a plate cylinder 10 and a blanket cylinder 20th A web of material 3, e.g. B. a web of newsprint is up between passed through the blanket cylinder 20 and an impression cylinder 30, wherein the impression cylinder 30 preferably as a further blanket cylinder with a this assigned plate cylinder is formed.

The plate cylinder 10 is rotatably arranged at one end 13 in a bearing 11 is located in a lever 12. As shown in Fig. 4, the lever 12 is on his attached lower end via a pivot point 101 to the frame 2 and at its upper End via an air piston 102 connected to the frame 2 and the lever 12 movable. The lever 12 and the air piston 102 form a connection and Parking mechanism by means of which the plate cylinder 10 from the blanket cylinder 20th can be moved away in the direction indicated by arrow 100, as in FIG. 1 is shown. Instead of the lever 12, an eccentric or another can be used in the same way known cylinder shut-off mechanism can be used.

The plate cylinder 10 is driven by a motor 40 arranged in a housing 42 driven. The motor 40 comprises a drive shaft 41. The housing 42 is stationary, what in the sense of this application means that the central axis of the drive shaft 41 is always on remains in the same position. In contrast, the housing 42 can be axially displaceable, by z. B. is arranged with a movable motor on a rail.

The drive shaft 41 is connected to a sun gear 51 of a planetary gear 50 and is preferably arranged coaxially to the axis of rotation of the plate cylinder 10. The Sun gear 51 also preferably drives a single planet gear 52, which preferably is rotatably supported in the housing 42. The axis of the planet gear 52 is with respect to the axis of the sun gear 51 fixed, which means in the sense of this application that the planet gear 52 remains in engagement with the sun gear 51 even if the axes of the internal ring gear 53 and the planet gear 52 are moved away from each other to a small extent, for. B. at Starting and stopping the printing unit cylinder.

The planet gear 52 drives a ring gear, for. B. an internal ring gear 53, which is preferably is firmly connected to one end 13 of the plate cylinder 10.

At the end 13 there is also a drive gear 54 for driving a driven one Gear 55 attached, the latter with one end 23 of the blanket cylinder 20 z. B. is connected by screws. The end 23 of the blanket cylinder 20 is in one Parking lever 22 mounted, which is similar to the lever 12.

The planetary gear 50 is shown in more detail in FIG. 2. Fig. 2 shows the plate cylinder 10 in the print job. The internal ring gear 53 has dotted lines Teeth 153 on. The sun gear 51 has teeth 151 which fit into the teeth 152 of the Intervene planetary gear 52. The teeth 152 are also with the teeth 153 of the Internal ring gear engaged. The sun gear 51 can, for example, 30 teeth Planetary gear can have 45 teeth and the internal ring gear 53 can have 120 teeth, so that a Reduction ratio of 4: 1 exists.

After the parking lever 12 has been moved in the direction of arrow 100 to the To move the plate cylinder 10 to the parked position (at the same time, a similar one Lever on the operator side), the inner ring gear 53 is also laterally in the Moved in the direction of arrow 100. The sun gear 51 and the planet gear 52 remain but preferably stationary.

In Fig. 3, the planetary gear 50 is shown in the parked state of the plate cylinder. In this state, teeth 151 and 152 remain fully engaged with each other because the motor 40 and the housing 42 are stationary. The teeth 153 move away from the Teeth 152 of the planet gear 52, but continue to mesh with each other even if they are not fully engaged.

The length of the teeth 153 and 152 is preferably selected such that the teeth 152 and 153 comb each other even when the plate cylinder is in the parked state. Comb as well also the teeth of the drive gears 54 and 55 of the printing couple cylinders 10 and 20 with each other in the parked state.

In this way, the plate cylinder 10 and the blanket cylinder 20 in parked state continue to be rotated by the drive motor 40, for. B. one flying plate change, in which the plate cylinder through the Drive motor braked down to standstill and then back up to Production speed is accelerated.

The teeth 152 of the planet gear 52 can be a device for avoiding Gear play include, e.g. B. a idler gear.

The blanket cylinder 30 and the plate cylinder associated therewith can be similar Have drive and shutdown mechanisms. However, it is also possible to use these cylinders by the motor 40 via a gear, e.g. B. connected to the drive gear 55 Gears to drive.

There can also be printing unit cylinders and storage mechanisms as well as an operator-side Arrangement of the printing press of the type described in US Pat. No. 5,678,485 Be used in connection with the present invention.

The motor 40 can also by means of an electronic control, for. B. one Microprocessor to be controlled so that the speed of the engine changes can be.

The drive unit, the plate cylinder in the described embodiment directly or drives via the planetary gear 50, can instead or in the same way alternatively drive the blanket cylinder.

List of reference numbers

1

Offset printing machine

2nd

drive side frame

3rd

Material web

10th

Plate cylinder

11

camp

12th

lever

13

The End

20th

Blanket cylinder

22

Parking lever

23

The End

30th

Impression cylinder

40

engine

41

Drive axle

42

casing

50

Planetary gear

51

Sun gear

52

Planet gear

53

Internal ring gear

54

drive wheel

55

driven wheel

101

Pivot point

102

piston

100

Parking direction

151

teeth

152

teeth

153

teeth

Claims (12)

Device for driving a printing couple cylinder (10, 20, 30) in a rotary printing press, in particular a web-fed rotary offset printing press, with a motor (40) which is drivingly connected to a sun gear (51) having a sun gear axis, a planet gear (52) which rotates around a planet gear axis and is driven by the sun gear (51), and with a ring gear (53) which is drivingly coupled to the printing group cylinder (10, 20, 30) and can be driven by the planet gear (52),
characterized,
that the planet gear is formed by a single planet gear (52), that the axis of the planet gear (52) is arranged at a fixed distance with respect to the axis of the sun gear (51), in such a way that during an on and off movement of the printing unit cylinder ( 10, 20, 30) the teeth (153) of the ring gear (53) coupled to this remain in mesh with the teeth (152) of the planet gear (52). Device according to claim 1,
characterized,
that the printing unit cylinder (10, 20, 30) is designed as a blanket cylinder (20) or a plate cylinder (10) of an offset printing machine. Device according to claim 1 or 2,
characterized,
that the printing group cylinder (10, 20, 30) can be moved into a first position and into a second position, the first position being a pressure adjustment and the second position being a pressure stop. Device according to claim 3,
characterized,
that the motor (40) remains in the same position both in the first position and in the second position of the printing unit cylinder (10, 20, 30). Device according to one of the preceding claims,
characterized,
that the sun gear (51) and the planet gear (52) are arranged on the side of the ring gear (53) opposite the printing unit cylinder (10, 20, 30). Device according to one of claims 3 to 5,
marked by
an on and off mechanism for moving the printing unit cylinder (10, 20, 30) into the first and second position. Device according to claim 6,
characterized,
that the on and off mechanism comprises a pivotable lever (12) or an eccentric. Device according to one of the preceding claims,
characterized,
that the gear ratio between the sun gear (51), the planet gear (52) and the ring gear (53) is 4: 1. Device according to one of the preceding claims,
characterized,
that the printing group cylinder (10, 20, 30) is designed as a plate cylinder (10) and that a blanket cylinder (20) is also provided which is coupled to the plate cylinder (10) via a driven gear (55) for driving. Device according to one of the preceding claims,
characterized,
that at least one of the gears (51, 52, 53) comprises a device for avoiding gear play in gearboxes. Device according to one of the preceding claims,
characterized,
that the sun gear (51) is arranged coaxially to the axis of rotation of the printing unit cylinder (10, 20, 30). Device according to one of the preceding claims,
characterized,
that the drive motor (40) drives the sun gear (51) via a drive shaft (41) which, when the printing unit cylinder (10, 20, 30) is turned on, coaxial with a drive shaft of the printing unit cylinder (10, 20, 30) connected to the ring gear (53) is arranged.

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