Browse Prior Art Database

VARIABLE SHEET GUIDE POSITION SENSOR

IP.com Disclosure Number: IPCOM000027071D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 8 page(s) / 393K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates generally to a sheet size sensor for a printing machine, and more particularly concerns a continuously variable sheet size sensor for an electrophotographic printing machine. It would be desirable to have a sheet size sensor which can sense any sheet dimension within a holding tray based on guide position and generate a signal indicative thereof. It would be further advantageous to have a sensor which is relatively inexpensive and does not require a multitude of discrete switches.

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Page 1 of 8

XEROX DISCLOSURE JOURNAL

VARIABLE SHEET GUIDE POSITION SENSOR Ermanno C. Petocchi Thomas Acquaviva
Norman
D. Robinson, Jr.
David E. Damouth

Proposed Classification
U.S. C1.355/311 Int. C1. G03g 21/00

f f 54

FIG. I

f- 100

I

54

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 85

[This page contains 1 picture or other non-text object]

Page 2 of 8

VARIABLE SHEET GUIDE POSITION SENSOR (Cont'd)

4

+ L.

IZ2 I I

122

I

FIG. 3

124

54

140 120

126

FIG. 4

86 XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995

Y

128

[This page contains 1 picture or other non-text object]

Page 3 of 8

VARIABLE SHEET GUIDE POSITION SENSOR (Cont'd)

BLUE GREEN

FIG. 5A

RED

FIG. 5B

FIG. 5C

t

FIG. 5D

0

FIG. 5E

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 87

[This page contains 1 picture or other non-text object]

Page 4 of 8

VARIABLE SHEET GUIDE POSITION SENSOR (Cont'd)

This disclosure relates generally to a sheet size sensor for a printing machine, and more particularly concerns a continuously variable sheet size sensor for an electrophotographic printing machine. It would be desirable to have a sheet size sensor which can sense any sheet dimension within a holding tray based on guide position and generate a signal indicative thereof. It would be further advantageous to have a sensor which is relatively inexpensive and does not require a multitude of discrete switches.

In Figure 1 there is illustrated an elevational view of a paper tray incorporating the continuously variable size sensor of the present invention. The tray base section 100 having a movable paper guide 102 adapted to slide in the direction of arrows 103 so as to be placed against a stack 54 of paper in the tray 100. As illustrated in Figure 2, the movable guide 102 has a continuously variable greyscale 104 imprinted on the bottom thereof which greyscale is in a position to be sensed by the sensor 110 located under the tray 100. In this illustrated embodiment, the sensor 110 is a reflective type sensor in which a signal is emitted an emitter portion of the sensor, reflected off of the greyscale and then sensed by a receiver portion of the sensor, which sensor 110 then generates a signal as a function of the amount of reflected signal value. A variety of sensors known in the art can be used to sense the greyscale pattern. The pattern is optically readable by illuminating the pattern with a light emitter and sensing the patterns of reflected light. In one embodiment, the sensor is divided into subsections comprising known photoemitter/photosensor pairs. Preferably, the emitterhensor pair is in close proximity because the reflected light pattern is more precisely detected by such a device. Alternatively, as described below with respect to Figs. 3 and 4 for a film type scale, the emitter/sensor pair can be separated by the scale. The film scale would then pass between the pair and provide a pattern of transmitted light. By calibrating the sensor signal level...