PURPOSE: To easily detect the abnormal rotation of the shaft of a weaving machine by detecting a rotating speed before the abnormal rotation and detecting the abrupt variation state of the rotating speed from the quantity of variation in the rotating speed after the unit time of the shaft later.
CONSTITUTION: The rotating speed of an object of detection such as the shaft of the weaving machine is converted into an electric signal V proportional to the value of the rotating speed firstly in a rotation-signal converting process. Then this speed signal V is converted into a variation quantity D per unit time by analog or digital differentiating operation in a variation detecting process. In a following comparing process, this variation quantity D is compared with a preset reference permissible value S. When the variation quantity D becomes larger than the reference permissible value S, it is decided the current rotation state is abnormal.
JPS60154165A | 1985-08-13 | |||
JPS5938659A | 1984-03-02 |