Cleaning web advancement and drive control mechanism

摘要

A mechanism for cleaning the surface of an operative element of a reproduction apparatus. The cleaning mechanism includes an elongated web of cleaning cloth material. A first support provides a supply of the elongated web of cleaning cloth material, and a second support provides a take-up for the elongated web of cleaning cloth material. A motor is operatively coupled to the second support to drive the second support for selectively advancing of the elongated web of cleaning cloth material from the first support to the second support to provide a clean portion of the elongated web of cleaning cloth material to clean the operative element. An encoder, associated with the motor, produces a string of pulses while the motor is operative to drive the second support. A logic and control unit produces a signal for turning the motor on for a period of time establishing a web advancement cycle where a given predetermined number of pulses in a pulse string are produced by the encoder. Responsive to the actual number of pulses in the pulse string of an advancement cycle, the period of time that the motor is turned on in a subsequent advancement cycle is adjusted based on the actual number of pulses in a previous string of pulses in order to adjust advancement of the web to provide for the most efficient use of the web of cleaning cloth material.