DE102008042396A1 - Drive for sheet-fed offset rotary printing machine, has main drive motor i.e. brushless direct current low-speed motor designed as high-torque motor, associated to drive gears directly or via single-stage auxiliary shaft gear - Google Patents

Abstract

The drive has drive gears (ARZ) driving a printing cylinder (1), a transfer drum (2), a rubber cylinder (3) and a coating unit (5). A main drive motor (M) is a brushless direct current low-speed motor designed as a high-torque motor. Individual drives (EA) are associated to plate cylinders (4) in printing/coating units (W1-W5). The plate cylinders stay in torque-transfer contact with the printing and rubber cylinders, the drum and the coating unit. The drive motor is associated to the gears directly or via a single-stage auxiliary shaft gear i.e. spur gear, with high rigidity.

Description

The The invention relates to a drive for a rotary printing machine with several works according to the generic term of the first claim.

In conventional rotary printing presses with a central main drive All of them transport the printing material through the press Cylinders or drums and all paint, varnish or dampening solution transferring Rollers, lifters, ductors or cylinders from a central drive motor a pressure and paint cross-system continuous drive wheel train driven. In the following, all driven cylinders, drums, Rollers, etc. summarized under the term rotary body become. In a central drive, the majority of the rotational body each assigned a drive gear of the drive wheel, the other rotating bodies, in particular inking rollers, Be over surface friction indirectly from neighboring, over the drive wheel train driven rotational bodies set in motion.

adversely at a central drive is the tendency to transfer from locally initiated vibrations across the continuous Drive wheel train, which is a vibratory system forms, on the entire printing press and the resulting Print quality restrictions.

to Reduction of tooth forces in the drive wheel train long presses and to reduce vibration problems are longitudinal shafts known, the driving torque of the main engine distribute several input points in the drive wheel train.

Also the longitudinal shaft forms an oscillatory system, which the vibration problems in a continuous drive wheel train can not solve.

alternative to the longitudinal shaft, the main drive can also be midway between The printing units are arranged so that is in the sub-machines each introduced only half the drive torque. However leads this central arrangement of the main engine due to the opposite flowing drive torque in turn to problems regarding a stable tooth flank installation with torque fluctuations, the express themselves in difficult to control register deviations of the partial print images.

With The means described could the disadvantages of conventional Main drives are not fundamentally overcome. To apply the high drive power for all printing and Lackwerke and peripheral facilities of a rotary printing machine are proven DC or AC motors in use, to generate the required pressure speeds in the range from 3000-18000 u / h (one-way shaft) in general over Belt transmission with the drive wheel of the printing press coupled with particularly long printing presses (with a Variety of printing and coating plants) over several Eintriebstellen or feed in drive torques with several drive motors. The However belt drives and distribution gears form due to their Elasticity and unavoidable belt unbalance Vibration sources, the Drehwinkelasynchronitäten in the Color transfer to the substrate or substrate transport amplify and also resulting pressure inaccuracies to lead. The slippery main propulsion engines are In addition, they are difficult to store and are due to their Size and inertia only limited to Infeed of vibration compensation torques suitable.

To overcome These disadvantages have recently become separate individual drives provided on those bodies of revolution whose decoupling from Drive wheel train to improve print quality due to the reduction of spurious oscillations or whose separate twistability saves a set-up time, parallel execution of auxiliary processes or easier correction of Asynchronisms between adjacent bodies of revolution allows. Preference Druckform-, Lackform- or Plate cylinders in offset printing presses equipped with single drives, in addition to the suppression of vibration influences one simultaneous plate changes in all printing units or a temporal Parallelism of auxiliary processes for set-up time savings to enable.

Such a printing press is for example from the DE 196 23 224 A1 known. This single drives are described in different arrangements for Bogenoffsetrotationsdruckmaschinen with a main drive or - to reduce the transmitted torque through the gears - with several main drives (multi-motor drive).

In the DE 198 22 893 A1 it is intended for a rotary printing machine with a main drive and integrated imaging devices for the printing plates to disengage printing forme cylinder during the Bebilderungsphase from the drive wheel train and drive with separate drives low vibration and higher speed. Outside the Bebilderungsbetriebes the uniformly rotating printing press components of the printing and coating plants with the individual drives and the vibration-prone modules of sheet delivery and delivery can continue be driven by the main drive.

For the individual drives are preferred so-called high-torque motors (= high torque) due to the backlash-free and stiff direct drive option the rotating body used. A disadvantage of high-torque motors is her size.

Of the However, the use of single drives can cause the vibration problems not in the drive wheel train with traditional main drive significantly reduce.

Of the Invention is therefore based on the object, the main drive in Presses with single drives to overcome the To improve disadvantages of the prior art.

According to the invention the object by a device with the features of the first Claim solved.

Of the Drive according to the invention for a rotary printing machine with several plants, which are designed as printing or coating plants, the color or paint transmitting rotational body and printed materials transport rotating bodies, wherein a cross-plant drive wheel train a Majority of the rotational bodies in and between the pressure or Lackwerke drives during a printing operation and at least one main drive drive torque in the drive wheel train is characterized by the fact that in drive configurations, in which one or more further rotation bodies (s) individual drive motors are assigned in the printing or coating units, wherein the individually driven rotating body with the driven by the drive wheel train rotational bodies are in a torque transmitting contact, the Main drive at least one designed as a high-torque motor Has slow runners, which directly or over a preferably single-stage countershaft transmission with high rigidity the Drive wheel is assigned.

The Invention is based on the recognition that the main part of the drive power for an offset rotary press in the color and Lackwerken due to the required there surface friction the color or paint leading rotary body is consumed and that therefore the use of individual drives on rotational bodies, the drive torque over Torques transmitting contacts or connections, d. H. via gear, surface or beard friction, also feed into the paint or coating plants, to a relief the main drive, making it possible to to design the main drive for lower drive power. With the use of individual drives in printing or coating plants of Offset rotary printing presses that are appropriate arranged on printing plate or plate cylinders or on rubber cylinders are, which can be used to drive the drive wheel train required main propulsion power can now be reduced to such an extent that the use of high-torque motors also possible for the main drive becomes. High-torque motors in the main drive point due to their excellent control behavior and its slip-free rotation angle positioning a high potential for effective fault torque compensation and continuous tooth flank system in the drive wheel train on.

The Invention has the advantage of being with the use of high-torque main drive motors too a considerable cost - saving simplification of the Printing press drive and by the possible waiver on elastic intermediate gear to reduce vibrations comes in the drive wheel train.

in the The invention is based on the example of a sheet-fed rotary printing press be explained in series construction. The Associated Drawing poses in

1 : is a schematic representation of a Bogenoffsetrotationsdruckmaschine with single plate cylinder drives and high-torque main drive motors in various arrangements.

In 1 is a sheetfed rotary printing machine in series construction with a sheet feeder AN, five printing units W1 ... W5 and a sheet delivery AU shown. Instead of one or more of the printing units W1 ... W5 also Lackwerke can be present. Each of the printing units W1 ... W5 has a sheet-guiding printing cylinder 1 on, with a front and a downstream sheet-guiding transfer drum 2 for the purpose of sheet transport between the printing units W1 ... W5 is in operative connection. Every impression cylinder 1 in the example designed as offset printing units printing or coating units W1 ... W5 is a respective partial printing image on the sheet transferring blanket cylinder 3 and this in turn a plate cylinder 4 assigned to the lateral surface of which a printing partial image having printing plate (not shown) is clamped. The plate cylinders 4 stand during printing with one inking unit each 5 (symbolically only one application roller is shown) and with the blanket cylinder 3 in surface contact to ensure continuous ink transfer to the sheets to be printed. Instead of plate cylinders 4 For example, printing plate cylinders can also be provided with an inline (direct) imageable lateral surface. Lackwerke not shown in the exemplary embodiment are constructed somewhat simpler, here eliminates the blanket cylinder 3 , so that the paint is applied by a paint cylinder directly to the substrate sheet.

The transfer drums 2 , Printing cylinder 1 , Rubber cylinder 3 and the plate cylinders 4 associated color works 5 are interconnected via a continuous drive wheel train ARZ, in 1 is represented symbolically by lines between the axes of rotation of the body of revolution.

At least one color-transmitting rotational body 3 . 4 per printing unit W1 ... W5 is assigned in a known manner in each case a single drive EA. Preferably, the plates are cylinders 4 the printing units W1 ... W5 detached from the drive wheel train ARZ and are driven separately by individual drives EA. The motors of the individual drives EA are synchronized with the drive wheel train ARZ / main drive motor (s) M via their drive controllers (not shown).

It is also known the rubber cylinder 3 or the rubber cylinders 3 and plate cylinder 4 (Printing forme cylinder) equipped with decentralized individual drives EA. The individual drives EA can also be associated with coating cylinders of coating plants.

According to the invention at least one main drive motor M is designed as a high-torque motor.

to better adaptation to those needed for printing Speed range, the input of the main drive motor M in the Drive wheel train ARZ via a single-stage countershaft transmission with high rigidity, such as a spur gear, done. The main drive motor M is driven by a (not shown) drive control at least speed and torque controlled.

The drive torque of the main drive motor M for the printing press is preferably via the impression cylinder 1 of the first printing unit W1 fed into the drive wheel train ARZ.

Through the continuous drive wheel train ARZ the drive torque on all centrally driven rotary body 1 . 2 . 3 . 5 distributed in the printing units W1 ... W5. In addition, the frictional surface contacts of the ink-carrying rotary body (rubber cylinder 3 , Plate cylinder 4 , Inking rollers ...) transmitted drive torque between centrally and locally driven rotary bodies. Furthermore, there are usually to achieve a constant contact pressure between pressure cylinders 1 , Rubber cylinders 3 and plate cylinders 4 in the edge regions of these cylinders hardened metal rings with the Abrolldurchmessern the lateral surfaces, which roll on each other under pressure and also transmit parallel to the surface friction of the lateral surfaces drive torque.

The inventive idea of the proposed solution for the main drive motor M is based on the already described fact that due to the large number of in the inking units 5 used rollers, which distribute surface friction and axial oscillations (oscillating) the ink evenly over the roll width, in the continuous printing operation, a large part of the drive power in the paint or coating units W1 ... W5 is consumed.

Because the separately driven plate cylinder 4 mizylindern during the printing operation over lateral surface and bearer ring contacts with the driven by the main drive motor M Gum 3 and inking 5 are in torque transmitting connection, flowing over the drive torques for the movement of the plate cylinder 4 Exceeding excess drive torques of the individual drives EA via the surface contacts with the rubber cylinders 3 and inking 5 in the drive wheel train ARZ, so that when switched plate cylinder single drives EA the main drive is relieved.

The torques of the individual drives EA on the plate cylinders 4 in each case to a part of the bearer contacts on the adjacent blanket cylinder 3 transferred and the other part on the lateral surface contacts, each with at least one inking roller in the inking units 5 initiated. rubber cylinder 3 and inking rollers are integrated with their drive gears in the centrally driven drive train ARZ.

A single driven and not connected to the drive wheel ARZ in connection rubber cylinder 3 would accordingly with the impression cylinder 1 and with the plate cylinder 4 are in a torque transmitting lateral surface and bearer contact, wherein in this drive configuration of the impression cylinder 1 and the plate cylinder 4 each feed a portion of the drive torque of the single drive EA in the drive wheel train ARZ and thus relieve the main drive motor M.

The reduced drive power of the main drive motor M allows the use of motor types, in particular highly dynamic high-torque motors, for a low-inertia angle control and vibration compensation by opposing drive torques far better than traditional main propulsion engines.

High-torque motors are usually referred to as motor types in which the rotor uses very strong rare earth magnets be.

at These motors are in particular preferably brushless DC motors, which are designed as slow-speed. High-torque motors have a high number of poles, the high power density and allows a very accurate angular position control, which is why they also be used as stepper motors.

Of the Advantage of the high power density of these motors will be advantageous complemented by their suitability for low speeds, so that less mechanical components, such as belts, gears or clutches needed. All these components bring unnecessary Elasticity in the required rigid drive system one. The high-torque slowers drive the shaft without Gear, so directly and completely free of play.

she own by design a very high efficiency, can can be easily cooled with water and can high pulse load due to good thermal coupling of the Coping with coils with the stator.

One Another advantage of the proposed drive solution exists in that for the individual drives EA and the main drive motor M same design motors can be used, thereby also a standardization effect occurs.

In long printing presses, it is advantageous analogously to known conventional drive arrangements to use several high-torque motors for the main drive (multi-motor drive), preferably at the first and last printing or coating unit W1 ... W5 in each case a high-torque motor in particular the pressure cylinder 1 or lacquer cylinder be assigned, the high-torque motors due to the high dynamics of these drives in comparison to known multi-motor drives a much better control behavior with respect to continuous tooth flank system (constant tension in the drive wheel ARZ) or Storm torque compensation. Depending on the operating mode of the printing machine, the second high-torque motor in front of the delivery can also work temporarily as a brake motor to achieve a stable tooth flank system. If the individual drives EA the plate cylinders 4 are assigned, designed as a high-torque motor main drive motor M also on a rubber cylinder 3 be arranged or in the case of multi-motor drives, at least two high-torque motors as the main drive motors M on rubber cylinders 3 various printing or coating units W1 ... W5 be provided.

1

pressure cylinder

2

Transfer drum

3

rubber cylinder

4

plate cylinder

5

inking

AT

sheet feeder

AU

Stacker

ARZ

drive wheel

W1 ... W5

Print- or coating unit

EA

individual drive

M

Main drive motor

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 19623224 A1 [0009]
• - DE 19822893 A1 [0010]

Claims (4)

Drive for a rotary printing machine with - several plants (W1 ... W5), which are designed as printing or coating units, - a cross-machine drive train (ARZ), the plurality of rotational bodies ( 1 . 2 . 3 . 5 ) drives during a printing operation, - at least one main drive motor (M), the drive torque in the Antriebsradzug (ARZ) feeds, wherein at least one further rotational body ( 4 ) in the works (W1 ... W5) in each case a single drive (EA) is assigned and the other rotational body ( 4 ) with the driven by the drive wheel train (ARZ) rotating bodies ( 1 . 2 . 3 . 5 ) are in a torque-transmitting contact, characterized in that at least one main drive motor (M) is designed as a high-torque motor slow-speed, which is assigned directly or via a preferably single-stage countershaft transmission with high rigidity of the drive wheel (ARZ). Drive according to claim 1, characterized in that the main drive motor (M) designed as a high-torque motor assigned to the printing material transport direction first work (W1) is. Drive according to claim 1, characterized that each designed as a high-torque motor main drive motor (M) is assigned to the first and the last plant (W1, W5). Drive according to one of the preceding claims 1 to 3, characterized in that the individual drives (EA) also are trained as high-torque motors slow-speed.