Control system for the uniform operation of plural Rolls cleanliness

摘要

The system in order to control the Rolls cleanliness which possesses the roller tube which receives the screen cloth of this invention with retraction changes the rotary speed of the roller tube in order to achieve fixed screen linear velocity. Screen linear velocity of desire, diameter of the roller tube, and thickness and length of the screen cloth for using by the microprocessor are housed in memory. As is liked, it can change the rotary speed of the roller tube with the microprocessor according to the screen position which is decided by the signal from the Hall effect sensor. The microprocessor keeps the number of counters which it increases or decreases according to the rotation direction of the roller tube, or. The microprocessor decides the rotary speed which is revised because of present screen position and screen linear velocity of desire on the basis of the number of counters. The microprocessor using the pulse duration modulation signal, controls the rotary speed of the roller tube as is liked. The system of this invention may be used in order to control the 1st and 2nd Rolls cleanliness which possesses the roller tube of the diameter which differs and, or it is possible to be used in order to control the 1st and 2nd Rolls cleanliness which possesses the screen cloth of the thickness which differs.