DE102007039221A1 - Multi-color sheet fed printing machine driving method, involves separately driving color deck and damping unit, coupling two auxiliary drives and subjecting auxiliary drives to brake torque - Google Patents

Abstract

The method involves separating a color deck (4) and a damping unit (5) by a main drive. The color deck and the damping unit are separately driven using two auxiliary drives of color deck and damping unit respectively. The auxiliary drives are coupled to a drive wheel train of the main drive during printing operation in a printing unit. The auxiliary drives are subjected to brake torque for feeding into the drive wheel train.

Description

The The invention relates to a method for driving a sheet-fed printing press with several printing units, with selected printing units not involved in the pressure.

Multi-color printing machine are widely used today. These have a variety of in the Usually in series arranged printing on, through which an arcuate Substrate is moved, wherein in each of the printing units a partial print image is applied in a printing ink on the substrate. Become not all printing units needed for a print job, if z. B. 4-color printing with a 5-works machine should it be possible, the inking unit not needed to be disconnected from the main pulley train by a clutch. plate cylinder and blanket cylinders then run on powered. The rubber cylinder is in pressure on position. This is necessary to one already printed sheets controlled by the unused ones Transport printing units, with the bow through the blanket cylinder to be led.

Of the Drive the sheetfed presses is predominantly about a regulated drive motor on a common continuous Drive wheel train, the cylinders in the individual printing units and arranged between the printing units transfer drums connects with each other. Such over a continuous Gear train and in particular also having a longitudinal shaft Drive systems are characterized by their high rigidity through high achievable print quality.

Just Multi-color printing machines with a large number of printing units tend in printing operation to vibrations and Passerdifferenzen that Dubliererscheinungen in the printed image, which adversely affects the print quality impact.

to Ensuring a high print quality Therefore, measures are taken that are permanent unidirectional tooth ramp in the gearbox cause a tooth flank reversal or a lifting of the tooth flanks to uncontrollable tension of the elastic to be regarded Cogwheels leads.

It various solutions have already been proposed in which several individual drives so in the continuous gear train Feed in that the power flow from printing unit to printing unit always in one direction.

In DE 42 10 988 A1 It is proposed to measure the instantaneous position of the electric motor in the form of a rotation angle at each power-feeding individual drive and supply it to a control device. The control device controls the electric motors in such a way that essentially a uniform tension in the gear train of the gear mechanism driving the printing machine is maintained.

Out DE 42 28 506 A1 is a drive with several drive motors in the continuous gear train known, in which the first drive motor feeds a surplus of power into the gear train and the last drive motor compensates for this excess power by braking the gear train.

EP 0 846 555 B1 Opposes DE 42 28 506 A1 position-adjustable drives. The individual drives are each offset by an angular offset. Thus, there is a defined tension in the gear train between the printing units. EP 1 149 697 A3 beats for two independently operated, storable

individual drives before, at two positions of the gear train, the angular position to measure and the location of a single drive in dependence from the difference resulting from these angular positions adjust.

adversely At these solutions is to provide multiple drive motors are and a relatively high control electronics is needed.

all Above solutions is common that they are used for clamping use the individual drives that are in during printing in feed the common gear train.

It is assumed by a printing press, in which all printing units involved in the pressure.

in the Case of not printing a printing unit in a printing machine, when the printing units on a common drive wheel train be powered by a main drive, the inking and if necessary, set the dampening unit off the plate cylinder. The non-printing engine is operated in print-on mode. This is necessary to control the printed sheet with the help of To transport rubber cylinders through the printing unit. As a result of changed moment load in the selected printing unit due to missing color splitting and missing frictional forces it to torsional vibrations and tooth flank lifts, the Dubliererscheinungen to lead.

In order to perform operations in rotary printing machines operations inside and outside of the printing operation, such as the cleaning of cylinders or rollers, the change of Druckplat th, circumference register corrections, solutions are already known in which individual rotation body are temporarily removed for faster implementation of certain auxiliary processes by means of clutches from the drive wheel train and connected to an auxiliary drive.

From z. B. DE 196 40 649 A1 a rotary printing press is known in which the plate cylinder is separated with a clutch from the main wheel train and driven in Bebilderungsbetrieb with an auxiliary drive. It has been proposed to use the auxiliary motor in the printing operation in order to achieve a constant tooth flank system for exerting a braking torque. The plate cylinder is driven in the printing operation of the main wheel train. All printing units are involved in the printing.

In DE-AS 2458772 During the normal printing operation, the inking unit is driven by the main machine drive and by an auxiliary motor for washing. On the other hand, the printing unit can be driven by the auxiliary drive during the Plattenbelegungsvorgangs on the inking unit. For washing the inking unit, the printing unit is stopped and only the auxiliary drive in operation. The two drives are separable by a coupling on the plate cylinder shaft and are used mutually to the drive.

Of the The invention is based on the object, a tooth flank change or backlash in the gear train of the main drive, in particular Also in printing, which are not involved in the pressure, certainly to avoid.

According to the invention the object by a method having the features according to claim 1 solved. Advantageous developments are in the dependent claims contain.

The Invention has the advantage that already existing in each printing unit Auxiliary drives for the inking unit and possibly for the dampening unit to carry out various operations now additionally used to enter in a printing unit Feeding braking torque into the gear train is thereby achieved a gain in functionality. The procedure is also suitable to work in a non-printing unit to feed in a braking torque. Is for the inking and the dampening unit each provided an auxiliary drive, so it is possible, in a non-printing unit one of the two auxiliary drives for generating the braking torque use and the other to carry out service work z. B Use roller washing of inking unit or dampening unit. It is also possible, inking and dampening over a Bridge roller to connect with each other, so that with the introduced washing liquid, the rollers of the inking unit and the dampening unit using only one auxiliary drive together can be washed.

Of the Auxiliary drive for feeding a braking torque into the gear train is controlled so that essentially a uniform Distortion of the printing press driving gear transmission is guaranteed. Load torque-dependent printing errors can be avoided with the invention.

are All printing units involved in printing, can be in any printing unit Braking torque are fed, but preferably in the last printing unit, with little effort a tension between the beginning and the end of the To achieve drive wheel train. Are not all printing units a multicolor printing press involved in printing, will be in these printing units fed a braking torque, the brake torque loss through the parked and possibly shut down paint and dampening unit compensated.

in the The invention will be explained by way of example below. The accompanying drawings show:

1 : Scheme of a printing unit of a sheet-fed printing machine

2 : Drive scheme for a printing unit

In 1 is a printing unit of a multi-color sheetfed press illustrated. Each printing unit consists of a printing cylinder 1 a rubber cylinder 2 , a plate cylinder 3 and rolling an inking unit 4 and a dampening unit 5 ,

In 2 a drive scheme for a printing unit of a rotary printing press is shown, with which the inventive method can be advantageously carried out. At the plate cylinder 3 the printing unit are the inking rollers 6 of the inking unit 4 and the dampening roller 7 of the dampening unit 5 to the plate cylinder 3 arranged on and off. All cylinders of the printing unit and at least one roller of the inking unit 4 and the dampening unit 5 are connected to each other via a gear train and by means of the main drive 8th drivable.

The drive diagram shows the input of the main drive 8th on the plate cylinder 3 , At the plate cylinder 3 is a cylinder gear 15 firmly arranged, with one on a dampening roller 7 rotatably mounted gear 16 Comb and continue with one on an intermediate shaft 18 also rotatably mounted gear 17 meshes, from which the drive over the intermediate shaft 18 in the inking unit 4 , preferably on an inking roller, a is driven.

On the rotatably mounted gears 16 and 17 is each a clutch 11 and 13 rotatably arranged, with which the gear 16 with the wave of the dampening roller 7 and the gear 17 with the intermediate shaft 18 either detachable or connectable to the main drive 8th are.

The wave of the dampening roller 7 is with a clutch 12 to the auxiliary drive 10 and with another clutch 19 can be coupled to and uncoupled from the dampening roller. Analogous to this is the intermediate shaft 18 with a clutch 14 to the auxiliary drive 9 and with another clutch 20 to the inking unit 4 can be coupled and uncoupled.

In printing operation can by closing the clutch 13 and 14 the auxiliary drive 9 of the inking unit 4 with the plate cylinder 3 be coupled. In this switching position is in the gear train a braking torque from the auxiliary drive 9 fed. Alternatively, there is the possibility of couplings 11 and 12 engage. In this switching position is in the gear train a braking torque from the auxiliary drive 10 fed.

If the printing unit is not involved in the printing of a multi-color printing press, the inking unit 4 and the dampening unit 5 deselected. In this mode of operation are the inking rollers 6 and the dampening roller 7 from the plate cylinder 3 turned off, ie the pressure contact between the rollers and the plate cylinder 3 is lifted, leaving no paint and moisture on the plate cylinder 3 is transmitted. By opening the couplings 19 and 20 become the dampening unit 5 and the inking unit 4 Driven decoupled and stopped.

One of the two auxiliary drives 9 . 10 will now be to the gear train of the main drive 9 coupled and used for feeding a braking torque in the gear train. The size of the braking torque is chosen so that the torque loss in the gear train by stopping and stopping inking 4 and dampening unit 5 is compensated in the non-printing unit involved in printing.

The auxiliary drive not required for feeding a braking torque of a parked plant - dampening unit 5 or inking unit 4 - can now be used for other service work.

In Printing presses with a plurality of printing units can be any printing unit operated according to the inventive method become. Preferably, however, the last printing unit for this mode of operation can be selected.

1

pressure cylinder

2

rubber cylinder

3

plate cylinder

4

inking

5

dampening

6

Inking roller

7

Dampener roller

8th

main drive

9

auxiliary drive

10

auxiliary drive

11

clutch

12

clutch

13

clutch

14

clutch

15

cylinder gear

16 17

gear

18

intermediate shaft

19

clutch

20

clutch

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4210988 A1 [0007]
• - DE 4228506 A1 [0008, 0009]
• EP 0846555 B1 [0009]
• - EP 1149697 A3 [0009]
• - DE 19640649 A1 [0016]
• - DE 2458772 [0017]

Claims (7)

Method for driving a sheet-fed printing machine having a plurality of printing units in a row construction, each comprising a plate cylinder ( 3 ), a rubber cylinder ( 2 ), a printing cylinder ( 1 ), an inking unit ( 4 ) and optionally a dampening unit ( 5 ), whereby the cylinders ( 1 . 2 . 3 ) including inking unit ( 4 ) and dampening unit ( 5 ) connected in printing operation via a common drive wheel train and by a main drive ( 8th ) are drivable and the inking ( 4 ) and optionally the dampening unit ( 5 ) from the main drive ( 8th ) separable and separately with an auxiliary drive ( 9 . 10 ) are drivable, characterized in that - in printing operation in at least one printing unit of the auxiliary drive ( 9 ) of the inking unit ( 4 ) or the auxiliary drive ( 10 ) of the dampening unit ( 5 ) with the drive wheel train of the main drive ( 8th ) and - this auxiliary drive ( 9 or 10 ) is acted upon by a braking torque for feeding into the drive wheel train. Method according to claim 1, characterized in that the auxiliary drive ( 9 or 10 ) is acted upon with a state adapted to the condition of the printing press, a clamping of the drive wheel train locking brake torque. Method according to claim 1, characterized in that an auxiliary drive ( 9 or 10 ) of the last printing unit is subjected to a braking torque. A method according to claim 1, characterized in that in a printing unit not involved in the pressure of the auxiliary drive ( 9 or 10 ) is acted upon by a torque loss in the printing unit compensating braking torque. Method according to claim 3, characterized in that, in the case of a printing unit not involved in printing, the inking unit ( 4 ) and optionally the dampening unit ( 5 ) decoupled on the drive side and shut down. Method according to Claim 3, characterized in that in the case of a printing unit not involved in the printing, the auxiliary drive not required for feeding the braking torque ( 9 or 10 ) is used to carry out service work. Method according to Claim 3, characterized in that the auxiliary drive not required for feeding a braking torque ( 9 or 10 ) is shut down.