Devices for driving a guide roller

Details Devices for driving a guide roller Devices for driving a guide roller

2000-06-26

2001-12-11

Mansen, Michael R. (Department: 3653)

Advancing material of indeterminate length

By orbitally traveling material-engaging surface

With drive means

C226S092000

Reexamination Certificate

active

06328195

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to devices for driving a guide roller.
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 driving stations is known from DE 24 02 768 C2.
It is a limitation of the prior device here 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 that large tensional forces act on the draw-in tip formed on the paper web, which often lead to a break in the paper web on a location between the paper web and the adhesive tip.
DE 36 04 504 C2 describes a draw-in device, wherein the guide rollers are driven by means of an auxiliary driving 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 based on providing devices for driving a guide roller.
In accordance with the present invention, this object is attained by moving traction devices, which draw in the web of material, to also drive the guide roller. The guide roller is driven only intermittently during the material web drawing in.
The advantages which can be achieved by means of the invention reside in particular in that, when driving is performed by the draw-in means, no mechanical, i.e. electrical, pneumatic, hydraulic or also linear-motor drive mechanisms, for example, need to be used for accelerating guide rollers or paper guide rollers prior to the draw-in process.
In particular in connection with finite draw-in means, i.e. those having a finite length, for example a finite roller chain, the guide roller is driven only intermittently by the finite drawing means, i.e. as long as the drawing means are located in the vicinity of the guiding roller. Therefore additional controls for switching the drive mechanism of the guide roller are omitted. The guide roller is only driven when the drawing means reach the vicinity of the guide roller.
If a centrifugal force coupling is used, a gentle acceleration of the guide roller without jerking takes place with little reactive effects on the drawing means.


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