Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1996-04-15
1998-01-13
Martin, David S.
Electricity: motive power systems
Open-loop stepping motor control systems
355 29, 399385, 83110, 27125801, H02P 800
Patent
active
057083452
ABSTRACT:
A compact sheet feeding and cutting apparatus is disclosed which is particularly suitable for retrofitting to an existing document reproduction machine. The sheet feeding and cutting components are located within a common housing which can be mechanically attached to an existing machine. In one embodiment, no electrical connections are required between the reproduction machine and the feeding and cutting apparatus. A sheet cutting length is entered into local memory and controls the operation of a dc stepper motor in a sheet cutting mode and a sheet feeding mode. The motor is reversed and operates in a sheet feeding mode to drive feed rollers causing the sheet to unroll from a supply roll. The motor is operatively connected to the drive feed rollers and to the sheet cutter through separate, one-way clutches. The sheet is fed from the roll at a faster speed than the speed of sheet travel within the reproduction machine as it advances to a transfer station. This speed mismatch periodically creates a buckle in the moving sheet which contacts a switch causing it to open and close. The switch thus controls an on/off operation of the motor changing it from a sheet feeding mode into a sheet cutting mode.
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Kramer William E.
Tracy Michael J.
Webb John L.
Martin David S.
Xerox Corporation
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