A system for measuring and transmitting a torque for a web wind-up apparatus.

摘要

A web spooling mechanism has a chuck that is coupled to a spool for rotating the spool to wind a length of web material onto the spool. Torque is transmitted from a drive shaft to the chuck through a spring coupled to the shaft and the chuck. A transducer measures the angular relationship between the shaft and the chuck throughout a range of relative angular positions therebetween. The transducer provides a signal indicative of that angular relationship, and the signal is transmitted to a controller that regulates the torque applied by the drive shaft. The position of the chuck relative to the drive shaft during web winding operation is a function of tension transients in the web. Since the system adjusts the torque of the drive shaft as a function of the angular relationship of the chuck and drive shaft, the system is effective to reduce tension transients in the web being wound onto the spool.