Claims
- 1. An air flow control system, in association with an electrostatographic reproduction apparatus, said air flow control system comprising:
- a fan for producing an air flow, a filter in the air flow causing a pressure drop in such air flow, a variable speed blower, a pressure transducer for measuring the pressure drop across said filter and generating a signal corresponding to the measured pressure drop, and a control unit, responsive to said signal from said pressure transducer for regulating the speed of said blower to maintain a desired air flow, including means for determining the speed of said blower and, at a predetermined threshold speed, providing an appropriate warning indicating that said filter is no longer operating efficiently and needs to be cleaned or replaced.
- 2. The air flow control system according to claim 1 wherein said variable speed blower is a DC analog speed control blower.
- 3. A cleaning system, in association with an electrostatographic reproduction apparatus utilizing pigmented marking particles for forming copies of information to be reproduced, for controlling air flow therethrough, said cleaning system comprising:
- a fan for producing an air flow in which residual marking particles and other debris are entrained, a filter in the air flow causing a pressure drop in such air flow, a variable speed blower, a pressure transducer for measuring the pressure drop across said filter and generating a signal corresponding to the measured pressure drop, and a control unit, responsive to said signal from said pressure transducer for regulating the speed of said blower to maintain a desired air flow, including means for determining the speed of said blower and, at a predetermined threshold speed, providing an appropriate warning indicating that said filter is no longer operating efficiently and needs to be cleaned or replaced.
- 4. The cleaning system according to claim 3 wherein said variable speed blower is a DC analog speed control blower.
RELATED APPLICATION
This application is related to U.S. Pat. No. 5,819,137 issued Oct. 6, 1998 , entitled INTEGRATED ENVIRONMENTAL MANAGEMENT FOR REPRODUCTION APPARATUS, filed in the names of Hoffman et al, on even date herewith.
US Referenced Citations (8)