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Web pick-up device and method for transfer of a paper web
| Details |
Inventors: Kraft, Wilfried;
Assignee: J. M. Voith GmbH (Heidenheim, DE)
Primary Examiner: Hastings; Karen M.
Assistant Examiner:
Attorney, Agent or Firm: Baker & Daniels
In a web pick-up device and a method of using the pick-up device in the press section of a paper machine, the running web makes contact, in a press gap, with a smooth rotating surface from which the web runs off at a point of pickup (A). The rotating surface and a suction box form together, in the area of the pickup point (A), a gap through which runs a porous conveyer belt which receives the fibrous web. The suction box is pivotably mounted and has in the area of the point of pickup (A) a sliding surface across which slides the conveyer belt, and which during operation is arranged at an adjustable spacing from the smooth surface. The spacing is determined by a stop on which bears the suction box during operation, under the effect of a flexible lift device. |
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DETAILED DESCRIPTION This problem is solved by the features of the present invention.
The present invention, in one form thereof, comprises a web pick-up device in a press section of a machine for making fibrous webs, wherein a running web makes contact in a press nip with a smooth rotating surface, and wherein the web departs said surface at a point of pickup.
The rotating surface and a suction box form together a gap in the area of the point of pickup, through which gap runs a porous conveyer belt, which belt receives the fibrous web.
The suction box is pivotably mounted, and has in the area of the point of pickup a sliding surface across which slides the conveyer belt.
The sliding surface is arranged at an adjustable spacing from the smooth rotating surface during operation of the device.
The spacing is determined by a stop on which the suction box bears during operation under the effect of a flexible lift device.
The invention is based on the insight that it is important to have the porous conveyer belt, in the area of the point of pickup, supported by a sliding surface which can be adjusted to a very small distance from the smooth surface (preferably the press roll itself).
Provided on the suction box, this sliding surface--in which preferably a suction opening (for instance a suction slot) is arranged--should be arranged, e.
g.
, at a distance between 3 and 10 mm from the smooth surface.
The optimal spacing needs to be determined operationally, for which reason the suction box needs to be pivotable, so that the distance can be determined by an adjustable stop.
It is also important that the suction box is operationally not secured rigidly to this stop, but that it is forced only gently on this stop under the effect of a flexible lift device.
Thus, the spacing between suction box and the smooth surface (for instance the press roll) may during the operation, if needed, be increased automatically, for instance if fiber material lumps (so-called blobs) or other contaminations proceed in the case of operational trouble together with the fibrous web across the press roll
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Manufacturing Materials 
