Printing – Rolling contact machines – Rotary
Patent
1997-09-18
1999-05-11
Eickholt, Eugene
Printing
Rolling contact machines
Rotary
101227, 101247, 101248, 101181, 36446904, 226 19, B41F5/00
Patent
active
059016477
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method, and to apparatus for driving a unit, for example a folding device for a rotary printing press.
DESCRIPTION OF THE PRIOR ART
EP 05 67 741 A1 discloses a method for driving rotating components or component groups, wherein an instantaneous tolerance range of their rotary angle position is preset for each selected electric motor drive of selected component groups, and the component groups are equipped with a drive, whose rpm and rotary angle position can be controlled. In the process, an instantaneous actual value of the rotary angle positions and an instantaneous set value of the rotary angle positions of each selected drive are constantly compared with each other.
DE 43 22 744 A1 described a method for driving a unit, wherein a separate motor, whose rotary angle position is controlled, is assigned to each drivable rotating component group. A computer unit is also provided and compares the rotary angle positions of selected component groups or motors.
Interchangeable folding devices for web-fed rotary printing presses are known from DE-AS 19 60 565, whose rotating components, such as perforating rollers, point spurs, cutting and folding blade cylinders, folding cylinders or folding rollers, as well as paddle wheels and delivery belts, are driven via a transverse shaft, a longitudinal shaft and respectively vertical shafts and gear wheel trains.
In this prior art device, it is a limitation that such drive trains have a multitude of gear wheels, drive shafts and the like, which are not only expensive to produce and install, but which also transfer the vibrations, which are created in the individual cylinders, rollers or functional groups of the folding device, to other, for example similar components, by means of drive components, for example gear wheels. This can lead to errors during transfer or passage of folded products which, in turn, can result in so-called "paper plugs", in particular in the belt guide systems, and therefore can cause the outage of the folding device.
SUMMARY OF THE INVENTION
The present invention is based on the object of providing a method and apparatus for driving a unit, for example a folding device of a rotary printing press.
This object is attained by setting an instantaneous tolerance range of the rotary angular position of selected electric motor drives for component groups. The drives for these component groups are selected so that their speed and angular positions can be regulated. An actual value of rotary angle positions is compared with a set value at any instance. If the preset tolerance range is exceeded, a signal is generated by an associated computer.
The advantages which can be achieved by means of the present invention in particular consist in that a mutual negative effect because of the transmission of vibrations to the individual driven components or groups of components of a printing unit or folding device, such as cylinders, drums, rollers and the like, is reduced. Outages of the folding device formerly caused by this vibrational problems are prevented. An elaborate manufacture, assembly and maintenance of the drive elements of the drive trains, as well as oil distribution systems, can be omitted. Furthermore, the effects of defects, which up to now were related with the drive train, cannot be transmitted further. The individual drives can be rapidly exchanged.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the present invention is represented in the drawings by means of a folding device, and will be described in more detail below.
Shown are in:
FIG. 1, a lateral view of a folding device with individual drives for the rotating components;
FIG. 2, a basic circuit diagram of the individual electrical drives in accordance with FIG. 1 in a first preferred;
FIG. 3, a basic circuit diagram of the individual electrical drives in accordance with FIG. 1 in accordance with a second preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In a second or top plane of a rotary pr
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Eickholt Eugene
Koenig & Bauer--Albert Aktiengesellschaft
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