EP1125734B1 - 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 cylinders in a printing press according to the preamble of claim 1.

At the printing cylinders of printing presses a substrate, z. As paper, printed. In web offset printing, the printing cylinder includes a plate cylinder and a blanket cylinder. A mounted on the plate cylinder printing plate contacted the wound on the blanket cylinder blanket while a web of material or a sheet of material between the blanket and an impression cylinder is passed therethrough. Ink is applied to the plate cylinder via inking rollers and the inked image is transferred to the blanket and from there to the web or sheet. For double-sided printing of the web of the impression cylinder may be formed as another blanket cylinder.

The plate cylinder and the blanket cylinder are driven by a driving mechanism arranged on the drive side of the printing machine, which usually comprises a gear for driving the individual printing unit cylinders. The drive mechanism can be driven by a single motor or by multiple motors. Hitachi Seiko's machines, for example, have a twin-motor drive for driving two printing cylinders in a four-cylinder printing unit. The machines from Heidelberg Web Press, Inc. have a three-motor drive for driving three printing cylinders in a four-cylinder printing unit.

To avoid winders at web breaks in web presses or to change plates or blankets, it is often necessary to turn off the plate cylinder from the blanket cylinder or the blanket cylinder from the impression cylinder. The mechanisms by which the printing cylinder are moved, referred to as on and Abstellmechanismen.

Since the plate cylinder and the blanket cylinder in the parked state must be further rotated, they must remain in communication with the drive mechanism.

US 4,309,945 describes a drive for a printing cylinder in a flexographic printing press, in which the printing plate cylinder carrying the printing plate is driven via a planetary gear by a main drive. Due to the design of the planetary gear with two oppositely disposed in a Innenhohlrad, supported on a sun gear planetary gears, it is not possible with the planetary gear described to turn off the printing plate cylinder from the adjacent printing cylinder, without the entire planetary gear as such and leading to the planetary gear main drive shaft to move, or in an elaborate manner angularly movable to design.
DE-A-2 435 665 describes a transfer drum, which is driven by a planetary gear.
US 4,953,461 describes a device for register adjustment of printing cylinders, in which the register adjustment as such by means of a so-called. Harmonic drive drive is coupled to the drive pin of the printing plate cylinder and provided on the outside with a drive sprocket. The drive sprocket is rotated by a drive motor, not shown, in turn and in turn drives an associated drive gear for the associated blanket cylinder, which is mounted on a corresponding journal of the blanket cylinder. The stub axle of the blanket cylinder drives via a drive shaft to a sun gear of a planetary gear, which in turn is coupled via drive gears to an input shaft of the harmonic drive drive to enable these in rotation. The document gives no indication to drive the plate cylinder or the blanket cylinder via a planetary gear by a main drive motor.

In the US 5,678,485 An offset printing machine with a counterweight and lift mechanism is described. The counterweight is provided to allow axial mounting of a blanket or pressure plate sleeve on a respective cylinder. The lifting mechanism is a shut-off mechanism, the z. B. for parking the plate cylinder is used. A drive mechanism is not described in this document.

In the US 3,724,368 a drive mechanism and a shutoff mechanism for an offset printing machine is described. A harmonic drive means allows register adjustment of both plate cylinders. The main drive of the printing press is a motor, which is connected to one of the blanket cylinders.

Press manufacturer MAN Roland uses a direct drive for a blanket cylinder. The motor is moved during parking and drives the blanket cylinder in the ratio 1: 1.

A problem of the devices described is that the motors are very large for driving the cylinder and take up much space, and also are often difficult to adjust. During shutdown, moreover, the motors often have to be moved together with the cylinders, which results in a complicated, very complex arrangement.

The object of the present invention is to enable the use of smaller drive motors for printing cylinder and the operation of the drive motors with higher speed. Another or alternative task is to allow a stationary arrangement of the engine even in the parked state of the cylinder.

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

The planetary gear according to the invention enables the use of higher-speed motors, since the sun gear rotates at a higher rotational speed than the internal ring gear. In this way, a lower inertia ratio is maintained on the engine. Due to the higher engine speed, a better electronic control of the speed of the printing cylinder is possible.

The printing cylinder is preferably formed as a blanket cylinder or a plate cylinder of an offset printing machine.

Furthermore, the printing couple cylinder is movable to a first position and a second position, wherein the first position is a Druckanstellung and in the second position is a print off. The motor preferably remains in the same position in both the first position and the second position of the printing cylinder, while the ring gear is moved with the printing cylinder, but still meshes with the planet gear, d. H. is in meshing.

The use of a fixed motor is highly advantageous as it makes it easier to park the cylinder when the engine does not need to be moved.

The device according to the invention preferably further comprises a connecting and disconnecting mechanism connected to the printing unit cylinder, which comprises a pivotable lever for moving the printing unit cylinder.
The printing cylinder can be formed as a conventional, a channel having cylinder or be designed as a cantilevered cylinder having a sleeve, such. B. carries a gapless blanket or even a gapless printing plate, over the free end of the printing cylinder, z. B. using blown air, can be pushed axially on this.

The gear ratio of the planetary gear is preferably 4: 1, d. H. the sun gear and the motor preferably rotate at four times the rotational speed of the ring gear and the printing cylinder.

The printing cylinder may preferably be formed as a plate cylinder of an offset printing press, which further comprises a blanket cylinder, which is driven via a drive gear connected to the ring gear and a driven gear connected thereto, which is fixed to the blanket cylinder. When the blanket cylinder and the plate cylinder are the same size, the drive gear and the driven gear are preferably also the same size.

The planetary gear preferably comprises a device for preventing gear play in transmissions. To minimize gear play, in particular a Beiläufer gear arrangement can be used.

The motor may be arranged to be axially displaceable and coupled to a helical gear to permit circumferential movement for register adjustment. Alternatively, the circumferential register can also be adjusted via the drive motors.

The features of the present invention will be explained in more detail in the following description of preferred embodiments in conjunction with the accompanying drawings listed below.

Fig. 1

eine teilweise, schematische Draufsicht einer Ausführungsform der vorliegenden Erfindung;

Fig. 2

eine schematische Seitenansicht des Antriebsgetriebes der in Fig. 1 gezeigten Ausführungsform;

Fig. 3

das in Fig. 2 gezeigte Antriebsgetriebe nach dem Abstellen des Druckwerkszylinders; und

Fig. 4

eine schematische Darstellung eines Abstellhebels, wie er in Verbindung mit der in Fig. 1 gezeigten Ausführungsform eingesetzt werden kann.

Show it:

Fig. 1

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

Fig. 2

a schematic side view of the drive gear of the embodiment shown in Figure 1;

Fig. 3

the drive gear shown in Figure 2 after stopping the printing cylinder. and

Fig. 4

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

Fig. 1 shows a partial plan view of an offset printing machine 1 with a drive-side frame 2, a plate cylinder 10 and a blanket cylinder 20. A web 3, z. B. a web of newsprint paper, is guided upward between the blanket cylinder 20 and a counter-pressure cylinder 30, wherein the impression cylinder 30 is preferably formed as another blanket cylinder with a plate cylinder associated therewith.

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

The plate cylinder 10 is driven by a motor 42 arranged in a housing 42. The motor 40 comprises a drive shaft 41. The housing 42 is stationary, which means for the purposes of this application that the central axis of the drive shaft 41 always remains in the same position. The housing 42 may, however, 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 drives a single planet gear 52, which is preferably rotatably mounted in the housing 42. The axis of the planet gear 52 is fixed with respect to the axis of the sun gear 51, which means for the purposes of this application that the planetary gear 52 remains engaged with the sun gear 51, even if the axes of the ring gear 53 and the planetary gear 52 moves slightly away from each other be, for. B. when turning on and off the printing cylinder.

The planetary gear 52 drives a ring gear, z. Example, a Innenhohlrad 53, to which is preferably fixedly connected to one end 13 of the plate cylinder 10.

At the end 13, a drive gear 54 is further fixed for driving a driven gear 55, 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 mounted in a stop lever 22 which is similar to the lever 12 is formed.

2, the planetary gear 50 is shown in more detail. Fig. 2 shows the plate cylinder 10 in the pressure position. The internal ring gear 53 has teeth 153 indicated by dotted lines. The sun gear 51 has teeth 151, which engage in the teeth 152 of the planetary gear 52. The teeth 152 are further engaged with the teeth 153 of the internal ring gear. For example, the sun gear 51 may have 30 teeth, the planet gear may have 45 teeth, and the inner ring gear 53 may have 120 teeth, such that a reduction ratio of 4: 1 exists.

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

In Fig. 3, the planetary gear 50 is shown in the parked state of the plate cylinder. In this state, the teeth 151 and 152 remain completely engaged with each other the motor 40 and the housing 42 are stationary. Although the teeth 153 move away from the teeth 152 of the planetary gear 52, they still mesh with each other even though they are not fully engaged.

The length of the teeth 153 and 152 is preferably selected such that the teeth 152 and 153 mesh with each other even in the parked state of the plate cylinder. Likewise, the teeth of the drive gears 54 and 55 of the printing cylinder 10 and 20 mesh with each other in the parked state.

In this way, the plate cylinder 10 and the blanket cylinder 20 in the parked state continue to be rotated by the drive motor 40, z. B. to make a flying plate change, in which the plate cylinder is slowed down by the drive motor to a standstill and then accelerated again up to continuous printing speed.

The teeth 152 of the planetary gear 52 may include a gear slip prevention device, e.g. B. a Beiläuferzahnrad.

The blanket cylinder 30 and the associated plate cylinder can have similar drive and Abstellmechanismen. However, it is also possible, these cylinders by the engine 40 via a transmission, for. B. connected to the drive gear 55 gears to drive.

It can also print cylinder and Abstellmechanismen and a user-side arrangement of the printing machine in the US 5,678,485 described type can be used in connection with the present invention.

The motor 40 may also be controlled by an electronic controller, e.g. As a microprocessor, are controlled so that the speed of the engine can be changed.

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

List of reference numbers

1

Offset

2

drive-side frame

3

web

10

plate cylinder

11

camp

12

lever

13

The End

20

Blanket cylinder

22

stop lever

23

The End

30

Impression cylinder

40

engine

41

drive shaft

42

casing

50

planetary gear

51

sun

52

planet

53

Inner ring gear or ring gear

54

drive wheel

55

powered wheel

101

pivot point

102

piston

100

Abstellrichtung

151

teeth

152

teeth

153

teeth

Claims (13)

1. Device for driving a printing-mechanism cylinder (10, 20, 30) in a rotary printing machine, in particular a web-fed rotary offset printing machine, said device having a motor (40) which is connected, driving-wise, to a sun wheel (51) having a sun-wheel axis, a planet wheel (52) which rotates about a planet-wheel axis and is driven by said sun wheel (51), and also an annular gear-wheel (53) which is coupled, driving-wise, to the printing-mechanism cylinder (10, 20, 30) and which can be driven by said planet wheel (52),
   characterised in that
   the planet wheel is constituted by a single planet wheel (52), that the axis of said planet wheel (52) is disposed at a fixed distance with respect to the axis of the sun wheel (51) in such a way that the teeth (153) of the annular gear-wheel (53) coupled to the printing-mechanism cylinder (10, 20, 30) remain in engagement with the teeth (152) of the planet wheel (52) when movements for throwing-on and throwing-off said printing-mechanism cylinder (10, 20, 30) occur.
2. Device according to claim 1,
   characterised in that
   the printing-mechanism cylinder (10, 20, 30) is constructed as a rubber-blanket cylinder (20) or a plate cylinder (10) of an offset printing machine.
3. Device according to claim 1 or 2,
   characterised in that
   the printing-mechanism cylinder (10, 20, 30) can be moved into a first position and into a second position, the first position involving the throwing-on of an impression and the second position involving the throwing-off of an impression.
4. Device according to claim 3,
   characterised in that
   the motor (40) remains in the same position both when the printing-mechanism cylinder (10, 20, 30) is in the first position and when it is in the second position.
5. Device according to one of the preceding claims,
   characterised in that
   the sun wheel (51) and the planet wheel (52) are disposed on the opposite side of the annular gear-wheel (53) from the printing-mechanism cylinder (10, 20, 30).
6. Device according to one of claims 3 to 5,
   characterised by
   a throwing-on and throwing-off mechanism for moving the printing-mechanism cylinder (10, 20, 30) into the first and second positions.
7. Device according to claim 6,
   characterised in that
   the throwing-on and throwing-off mechanism comprises a pivotable lever (12) or a positioning eccentric.
8. Device according to one of the preceding claims,
   characterised in that
   the transmission ratio between the sun wheel (51), the planet wheel (52) and the annular gear-wheel (53) is 4:1.
9. Device according to one of the preceding claims,
   characterised in that
   the printing-mechanism cylinder (10, 20, 30) is constructed as a plate cylinder (10) and that a rubber-blanket cylinder (20), which is coupled, for driving purposes, to said plate cylinder (10) via a driven gear-wheel (55), is also provided.
10. Device according to one of the preceding claims,
    characterised in that
    at least one of the gear-wheels (51, 52, 53) comprises a device for eliminating gear-wheel play in transmissions.
11. Device according to one of the preceding claims,
    characterised in that
    the sun wheel (51) is disposed coaxially with the axis of rotation of the printing-mechanism cylinder (10, 20, 30).
12. Device according to one of the preceding claims,
    characterised in that
    the driving motor (40) drives the sun wheel (51) via a drive shaft (41) which, when the printing-mechanism cylinder (10, 20, 30) is thrown on, is disposed coaxially with a drive shaft of said printing-mechanism cylinder (10, 20, 30), which drive shaft is connected to the annular gear-wheel (53).
13. Device according to one of the preceding claims,
    characterised in that
    the annular gear-wheel (53) can be moved with the printing-mechanism cylinder.

Images