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MECHANICAL DIFFERENTIAL MOTION SENSOR TIMER

IP.com Disclosure Number: IPCOM000023550D
Original Publication Date: 1978-Feb-28
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 389K

Publishing Venue

Xerox Disclosure Journal

Abstract

A mechanical differential motion sensor/timer is disclosed for detecting the differential motion between a sheet of paper and the roll driving it with the sensor being used as a means of starting and stopping the drive roll. As shown in the Figure, paper that is forwarded into tray 10 in the direction of the arrow engages motion sensor roll 22, and drives it, causing the actuator pulley 23 to undergo lateral movement over threaded collar 18 to close switch 30 to actuate drive roll 13. The drive roll tends to move the actuator pulley in the reverse lateral direction to open the switch and deenergize the drive roll. However, as long as the paper is moving under the motion sensor roll 22 and driving it, the effect of the two rolls on the threaded collar cancel each other, and the actua-tor pulley does not move laterally. When the paper is stopped, as by registration fingers, the motion sensor roll stops. The drive roll 13 continues, and this action now reverses the lateral movement of the actuator pulley until the switch is opened to deenergize the drive roll.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

MECHANICAL DIFFERENTIAL MOTION
SENSOR/T IMER
Danny J. Prats

Proposed Classification
U.S. Cl. 271/265
Int. Cl. B65h 7/02

A mechanical differential motion sensor/timer is disclosed for
detecting the differential motion between a sheet of paper and
the roll driving it with the sensor being used as a means of
starting and stopping the drive roll. As shown in the Figure,
paper that is forwarded into tray 10 in the direction of the
arrow engages motion sensor roll 22, and drives it, causing
the actuator pulley 23 to undergo lateral movement over
threaded collar 18 to close switch 30 to actuate drive roll
13. The drive roll tends to move the actuator pulley in the
reverse lateral direction to open the switch and deenergize
the drive roll. However, as long as the paper is moving under
the motion sensor roll 22 and driving it, the effect of the two
rolls on the threaded collar cancel each other, and the actua-
tor pulley does not move laterally. When the paper is
stopped, as by registration fingers, the motion sensor roll
stops. The drive roll 13 continues, and this action now
reverses the lateral movement of the actuator pulley until the
switch is opened to deenergize the drive roll.

Volume 3 Number 1 January/February 1978 51

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Page 2 of 2

MECHANICAL DIFFERENTIAL MOTION SENSOR/TIMER (Cont~d)

A second use of the differential motion sensor/timer is as a
paper jam detector. To achieve this, the reverse of the above
ope...