| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure nip width dynamically. <P>SOLUTION: Provided is an apparatus and method for detecting nip width by use of at least one piezoelectric (PZT) crystal embedded into a roll at both the inboard and outboard ends. The piezoelectric (PZT) crystal generates a charge when subjected to a load and when released from the load. The PZT generate signal is channeled to the ends of the roller such as with a brush contact to be processed and used within machine control. The duration measure from application and release of the load is indicative of the dwell time, and the amplitude of the PZT generate signal is a function of the pressure. The time and amplitude of the PZT signal can be calibrated to correlate directly to nip width or nip pressure and tracked in machine control. <P>COPYRIGHT: (C)2012,JPO&INPIT |
