JPS5655835A - Detecting method for imbalance of rotary body - Google Patents

Abstract

PURPOSE: To stop the tested rotary body automatically at the position of imbalance by a method wherein pulses in the same number with that of teeth provided at equal intervals on the rotary body are detected by a sensor and the number of the pulse obtained from a place where the position of imbalance located is stored in memory.

CONSTITUTION: A laser beam is applied from a laser-beam emitting device 6 to the edge 8 of a tooth 7 and is detected as an edge pulse by an image sensor 9. An edge pulse (b) obtained from the image sensor 9 counts, for instance, the n-th imbalanced position existing in twelve teeth and makes the same be stored in memory. Furthermore, so as to increase the positional accuracy of the imbalanced position, a carrier signal (d) is made to overlap with the edge pulse (b). Hereupon the pulse of an imbalance signal given in the course of high-speed rotation V₁ stores Pn-θH (Pn is edge pulse, θH is imbalance signal), next counts Pn, and then counts θL from the carrier signal (d). When the counting is ended, a servomotor is switched off and the tested rotary body 1 is made to stop at the position of imbalance by a solenoid 10.

COPYRIGHT: (C)1981,JPO&Japio