Printing – Rolling contact machines – Rotary
Patent
1998-05-06
1999-10-12
Eickholt, Eugene
Printing
Rolling contact machines
Rotary
270 211, 270 50, 493444, 493445, B41F 1324, B41F 110
Patent
active
059641541
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a folding device of a rotary printing press. More particularly, the present invention is directed to a device for setting a cylinder gap of a longitudinal folding device. Double levers which support the folding cylinder are pivoted by a drivable differential screw mechanism.
DESCRIPTION OF THE PRIOR ART
A prior art folding device has become known from DE 40 20 937 A1, whose folding cylinders are rotatably seated on first ends of respectively double-armed levers. Second ends of the double-armed levers are hingedly connected with a threaded spindle, which has opposed screw threads on its ends. Setting of the cylinder gap is performed by turning the threaded spindle in one or the other direction.
It is known from DE 38 38 314 A1 to determine the thickness of the folded product by means of a thickness measuring device and to supply it to a production computer, for example arranged in the machine control device. The computer can be used to accomplish an automatic setting of the cylinder gap.
JP 07-237812 discloses a device for adjusting a cylinder gap of a folding device. The folding cylinders are seated in double-armed levers, which are displaced by means of a threaded spindle.
DE 40 18 709 A1 and EP 04 00 527 A2 show folding devices, wherein the distance between the folding cylinders can be changed by means of a threaded spindle.
SUMMARY OF THE INVENTION
Its is the object of the present invention to create a cylinder gap setting device by means of which it is possible to set a folding cylinder gap with a high degree of accuracy or sensitivity.
This object is attained in accordance with the invention by providing a pivotable double lever which supports one of the folding cylinders. At least one drivable differential screw mechanism is provided as the drive for pivoting the lever to adjust the folding cylinder gap.
The advantages which can be achieved by means of the present invention in particular reside in that a high setting accuracy of the folding cylinder gap is achieved because of the use of a differential screw mechanism. By means of the possibility of using relatively coarse, i.e. sturdy screw threads with a pitch between 2.0 and 3.5 millimeters, as well as the employment of springs, it is possible to absorb suddenly appearing additional forces occurring between the folding cylinders, for example because of product jams, without causing damage. Following the entry of the paper thickness and number of pages, it is also possible to set the folding cylinder gap to a value determined by the production computer. In the process, corrections of the folding cylinder distance, which become necessary because of the appearance of wear of the folding strips on the folding cylinders, can be made in a simple manner. The setting device in accordance with the invention is suitable for use with roller or blade folding devices, and can also be used for cylinder adjustment in cylinder folding devices. There is also the option of providing a manual operation, which can be controlled by a graduation, in place of a motor drive.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is represented in the drawings and will be described in more detail in what follows. Shown are in:
FIG. 1, a sectional representation of a first preferred embodiment of a cylinder gap setting device in accordance with the present invention;
FIG. 2, a schematic representation of a second preferred embodiment of the present invention; and
FIG. 3, the enlarged representation of a detail "Z" in FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A folding device 1 of a rotary printing press, as seen in FIG. 1, has a left and a right folding cylinder 2, 3. The two folding cylinders 2, 3 are drivingly seated with each of their two ends respectively at first ends 4, 6 of each of two-armed levers or double lever 7, and 8, respectively. The seating of the folding cylinders 2, 3 has only been represented and described at one end in FIG. 1. It will be understood that
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patent: 3691956 (1972-09-01), James
patent: 3954258 (1976-05-01), Skipor et al.
patent: 4190242 (1980-02-01), Bolza-Schonemann
patent: 5057064 (1991-10-01), Michalik
patent: 5080339 (1992-01-01), Hirahara
patent: 5147276 (1992-09-01), Stab
Eickholt Eugene
Koenig & Bauer--Albert Aktiengesellschaft
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