B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
137/84
B65H 23/038 (2006.01)
Patent
CA 1264138
DIFFERENTIAL PRESSURE BIASED SPOOL TYPE VALVE CONTROLLER FOR A PNEUMATIC DUAL DIAPHRAGM CONTROL SYSTEM ABSTRACT OF DISCLOSURE The invention relates to a direct acting pneumatic control system for controlling a dual diaphragm, or double acting cylinder type automatic guiding system. The control device and system is used to selectively adjust the position of one end of a guide roll relative to the opposite end, in order to adjust the position of an endless web traveling over a series of rolls. In order to adjust and control the guide roll position, it is necessary to alternately exhaust one diaphragm, and or cylinder end, while maintaining the flow of air to the opposite diaphragm or cylinder end. This in effect shifts the end of the roll in a lateral direction, effectively steering the web in the proper direction to effect the necessary web correction. To activate and control the valve position, the control valve is equipped with a palm which follows the web and con- tinually monitors the web position and activates the control valve spool to modulate the "flow-exhaust" rates to bring the web to the corrected position with no over-run or "hunting" for posi- tion. The palm and rod must follow the web when the web is moving away from the palm. It is necessary to have thrust within the valve to accomplish this function. In this design this thrust is accomplished through the use of differential pressure across the spool ends with the necessary porting within the valve to accomplish the spool displacement.
496951
Dufour Kenneth S.
Perley-Robertson Hill & Mcdougall
LandOfFree
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