D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/25
D21F 1/42 (2006.01) D21F 1/34 (2006.01)
Patent
CA 1044931
ABSTRACT OF THE DISCLOSURE This invention relates to a method and apparatus for guiding endless woven fabric belts such as are used on paper making machines. One of the problems with such belts is that, during operation, they tend to drift off center so that guide means have to be provided to maintain them centered on the machine. The traditional approach is to provide a guide roller in a low tension portion of the endless belt. However, this solution is expensive and the action of the roller is slow especially on slower operating machines. The instant application provides a novel method and apparatus for guiding the endless belts and keeping them centered. Specifically, the instant application teaches the use of a guide shower, which is disposed across the width of the endless belt, to provide the guiding action. The shower comprises a series of nozzles which are adapted to be directed at one edge or the other of the endless belt. Three separate embodiments are disclosed. In one of the embodiments, the shower pipe connecting the nozzles is divided into a left side and a right side. The nozzles on the left side are all directed at the left edge of the endless belt whereas the nozzles on the right side are directed at the right edge of the endless belt. In a second embodiment, two parallel shower pipes are disclosed, the nozzles of one of the shower pipes all being directed at the left edge of the endless belt, the nozzles of the other pipe all being directed at the right edge of the endless belt. In a third embodiment, a series of swivelling nozzles are mounted on the shower pipe. The direction of the nozzles is adjusted in response to signals from a sensing device so that all of the nozzles on the pipe are pivoted towards one or the other of the edges of the endless belt.
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