Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
Circuit 10 replaces the function of a mechanical slip clutch used in conjunction with DC actuator motor 12. Bidirectional actuator motor 12 may be employed, for example, to lift a heavy cover on a machine such as an electrostatic wide plotter. In the past, motor 12, upon raising or lowering a heavy cover to its end of travel positions, would shut off when a sensor indicated a current rise in motor operation. The current rise would result from the motor 12 working with clutch slippage. A disadvantage is that, if there is clutch malfunction, permanent damage would result to the motor. Also, the motor relay 14 is temporarily overloaded at maximum motor voltages present at end of travel positions until the operator releases the manual control button operating motor 12. The continual presence of these high voltages have a deleterious effect on motor life.