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ELECTRIC CLUTCH

IP.com Disclosure Number: IPCOM000024492D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U.S. Cl. 361/31 Int. C1. H02h 5/04

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POWER SOURCE -

TY I

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.

Circuit 10 is an "electronic clutch" improving the life expectancy of motor 12 while providing a more cost effective approach. Circuit 10 determines when the actuator motor 12 has reached the end of its travel by sensing the increase in current in motor 12; i.e., stall current. When circuit 10 senses stall current, relay 14, which has its contact in a normally closed position, is actuated. This disconnects the power source from motor 12.

Volume 5 Number 5 September/October 1980 55 1

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