Printing – Multicolor – Rotary machines
Patent
1994-12-19
1998-11-17
Fisher, J. Reed
Printing
Multicolor
Rotary machines
B41F 508, B41F 512, B41F 516
Patent
active
058362452
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
Drive for a Multi-Color Web-Fed Rotary Printing Press
DESCRIPTION OF THE PRIOR ART
The invention relates to a drive for a multi-color web-fed rotary printing press.
A web-fed rotary printing press with several inking units and a folding unit is known from DE-OS 31 12 775, wherein a drive shaft, driven by a main motor, is provided and is connected via upright shafts with the printing units.
It is disadvantageous here that the entire printing operation is stopped when the main drive motor fails. It is furthermore disadvantageous that, because of the disconnection of printing units not needed for reasons of production, it becomes necessary to switch on current limiting device in order to prevent too great a brush wear of the electric motor.
SUMMARY OF THE INVENTION
It is the object of the invention to provide an easy-to-synchronize drive for a multi-color web-fed rotary printing press having an output which is adapted to the given production requirements, by means of which printing units which are not needed temporarily can either be turned off or operated for cleaning and preparation work.
A drive for a multi-color web-fed rotary printing press employs a main shaft and several upright shafts. Several printing units, which are disposed above each other to form printing groups, each have a separate drive motor and are each connected by a clutch and a gear to one of the upright shafts. Each of the upright shafts, as well as folding units which are driven by their own separate motors, are connected through clutches to the longitudinal main shaft.
The following advantages in particular ensue when employing the invention. By means of the assignment of one drive motor to a printing unit it is possible to disconnect it separately from the drive system when necessary and in this way to adapt the drive output to the given production requirements. Current limiting devices for a main motor, which were necessary up to now, can be omitted. For cleaning, maintenance or pre-inking work at the printing cylinders it is furthermore possible to run the printing unit by means of the respectively assigned drive motor without producing anything. In case of the loss of a motor driving a printing unit, is possible to obtain the power for running a printing unit via the upright shaft, i.e. the motors and shafts are of such size that they can also provide the output of a failed motor. Connection of a printing unit to the synchronized or upright shaft is provided with small outlay via a clutch, wherein synchronization is provided by means of an absolute value transmitter or a positive clutch. A simple seating possibility is provided because the drive motors are alike.
Possible separate auxiliary motors, which were possibly used up to now for washing, setting-up or positioning, can therefore also be omitted.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in detail below by means of an exemplary embodiment. The associated drawings show in
FIG. 1, a front view of a multi-color web-fed rotary printing press with a drive diagram;
FIG. 2, an enlarged representation of a printing group of FIG. 1, but without showing the drive.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Three identical printing groups 1, 2, 3, so-called towers of eight, are represented in FIG. 1, which each have four printing units 7 to 18 disposed on top of each other. Each printing unit 7 to 18 has respectively two rubber blanket cylinders 21, 22 as well as two plate cylinders 23, 24. The plate cylinder 23 of each printing unit 7 to 18 is driven by a motor 26. The rubber blanket and plate cylinders 21 to 24 are respectively connected with each other by means of known toothed gears. Each one of the printing units 7 to 18 is connected via a clutch 27, a beveled toothed gear 25, a synchronizing or upright shaft 28, 29 or 30, an upright shaft clutch 32, 33 or 34 and a beveled toothed gear 25 with a synchronizing or longitudinal shaft 36. The clutches 27, 32 33, 34 can be known clutches in good register and can consist of an upp
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patent: 1640977 (1927-08-01), Brueshaber
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patent: 2673315 (1954-03-01), Seeger
patent: 3221651 (1965-12-01), Tagliasacchi
patent: 4240346 (1980-12-01), Landis
patent: 5341735 (1994-08-01), Hajek
Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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