Advancing material of indeterminate length – Threading device
Reexamination Certificate
2000-06-26
2001-11-27
Mansen, Michael R. (Department: 3653)
Advancing material of indeterminate length
Threading device
C226S188000
Reexamination Certificate
active
06321967
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to a device for drawing-in a web of material. The material is drawn in along a web travel path that has guide rollers.
DESCRIPTION OF THE PRIOR ART
A device for drawing-in a web of material by finite flexible traction means driven along the draw-in path by means of adjoining drive stations is known from DE 24 02 768 C2.
It is a limitation of this prior device that the drawing means are subjected to great wear, since they must conduct the web of material, for example a paper web, around a number of paper guide rollers, wherein some of the paper guide rollers reverse them by up to 180° and they must be brought from a stop to the draw-in speed by the paper web. It is therefore possible, in the course of the draw-in of the paper web, that large tensional forces act on the draw-in tip formed on the paper web, which forces often lead to a break in the paper web at a location between the paper web and the adhesive tip.
DE 36 04 504 C2 describes a draw-in device, in which the guide rollers are driven by means of an auxiliary drive mechanism during the draw-in of a paper web.
EP 0 094 631 B1 shows a device for drawing-in a web of material by means of a rope. This rope drives guide rollers via a controllable coupling.
SUMMARY OF THE INVENTION
The object of the present invention is directed to providing a device for drawing-in a web of material.
In accordance with the present invention, this object is attained by providing a material web path that has guide rollers. At least one of these guide rollers is rotated by a drive mechanism prior to the arrival of the web of material. An overriding coupling is provided between the roller drive mechanism and the guide roller or rollers.
The advantages which can be achieved by means of the present invention reside, in particular, in that it is possible to greatly reduce the strain on the web of material, and on the traction means when drawing the web of material into the printing press. The reduced strain on the web of material and on the traction means permits an increase of the draw-in speed of the web of material almost up to the production speed.
No particular control devices are necessary for switching the drive mechanism when the web of material takes over the driving of the guide roller. Strains on the web of material caused by jerking of the material are reduced.
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patent: 24 02 768 (1978-04-01), None
patent: 33 44 929 (1984-07-01), None
patent: 36 04 504 (1989-01-01), None
patent: 195 05 432 (1995-09-01), None
patent: 0 094 631 (1986-09-01), None
Hartmann Manfred Wolfgang
Michalik Horst Bernhard
Jones Tullar & Cooper PC
Koenig & Bauer Aktiengesellschaft
Mansen Michael R.
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