Manufacturing container or tube from paper; or other manufacturi – Bending – Deflecting
Patent
1997-08-08
1999-12-28
Vo, Peter
Manufacturing container or tube from paper; or other manufacturi
Bending
Deflecting
493459, 242 90, 242180, B31F 100
Patent
active
06007471&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a flattening device for a paper web in a paper processing machine, with a non-rotatable deflecting bar extending transversely to the paper feed direction, a deflecting roller parallel thereto and preceding or following the bar in the paper feed direction and two support plates carrying in common the respective ends of the deflecting bar and of the deflecting roller, which plates are adjustable relative to a stationary mount about a pivotal axis arranged between and axially parallel to the axes of the deflecting bar and the deflecting roller, wherein the paper web passes in an S-shape between the deflecting bar and the deflecting roller for the flattening and is drawn under friction over the deflecting bar.
BACKGROUND OF THE INVENTION
If for example a paper processing installation is arranged after a laser printer in an automatic account processing machine, it frequently happens that the paper web leaving the laser printer has curvatures, so-called curls. These curvatures stem from the fact that the paper web is heated in the laser printer, whereby the residual moisture of the paper web is reduced. Since this heating takes place on one side, the paper curves and holds its curvature even during further passage through the paper processing machine. Since the curvature exhibits itself by interfering with the further processing it is advantageous to cancel it out by a flattening device of the kind initially referred to. However, further problems can arise from the flattening device itself. In the known flattening device, the adjustability of the support plates about their axis merely serves to alter the wrap angle with which the paper web surrounds the stationary deflecting bar, in order to thereby remove curvatures of the paper web of different degrees. The appropriate position of the deflecting bar and the deflecting roller relative to one another is determined in a trial run and then the support plates are clamped in position relative to the mount. Therefore, the deflecting bar and the deflecting roller always assume the same position, both when the paper web is running and also when it is stationary, during further operation of the machine. The disadvantage which arises from this is that the friction with the deflecting bar has to be overcome also when starting the machine. In order to avoid the paper web tearing, the starting up has to take place slowly. Also, the fact that the paper web bears in S-shape on the deflecting bar and the deflecting roller while the machine is stationary has a disturbing effect. Because of this an S-shaped deformation forms in the paper web, which can also lead to disturbance in further processing. At the least, the S-shaped deformation remains visible after the processing. Finally the curvatures of the paper web caused by the laser printer can be differently orientated. Since, however, this can only be determined after a trial run of the machine, it is frequently necessary to un-thread the paper web again from the flattening device (also called a de-curler), so that the deflecting bar and deflecting roller can be turned into a position, after releasing the clamping arrangement, in which the cancellation of an oppositely directed curvature of the paper web is possible. Then the paper web has to be threaded up again, which is time-consuming, because this does not have to take place only in the de-curler but also in further stations of the machine.
The invention is therefore based on the object of providing a flattening device for a paper web in a paper processing machine, in which S-shaped deformations of the paper web while the machine is stationary are avoided. In further development of the invention the flattening device is to be so designed that it facilitates the cancellation also of oppositely directed curvatures which are caused by the laser printer, without threading up the paper web again.
As to the first-mentioned purpose, the invention firstly provides that a servomotor is associated with one of the support plates,
REFERENCES:
patent: 1935726 (1933-11-01), Pierson
patent: 3051362 (1962-08-01), Shook
patent: 3656677 (1972-04-01), Stepanek et al.
patent: 4360356 (1982-11-01), Hall
patent: 5009749 (1991-04-01), Cederholm et al.
patent: 5193728 (1993-03-01), Pieroni
patent: 5346457 (1994-09-01), Kimura
patent: 5848347 (1998-12-01), Kuo et al.
Konica Co., Transfer Paper Curl Eliminator for Transfer Type Image Former, Patnet Abstracts of Japan, Mar. 1989.
Koelle Helmut
Kraus Christian
Munk Werner
Boewe Systec AG
Luby Matthew
Vo Peter
LandOfFree
Flattening device in a paper processing machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flattening device in a paper processing machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flattening device in a paper processing machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2378862