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SENSOR ASSEMBLIES FOR USE IN FEEDING CLINCHED COMPUTER FORMS

IP.com Disclosure Number: IPCOM000026507D
Original Publication Date: 1992-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 6 page(s) / 283K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a feeder for handling computer forms which are to be copied, it is known to use one or more sensors to detect the sprocket holes in the forms. The output of the sensor($ can be used to monitor and/or control the passage of the computer form web through the copier. Problems can arise, however, when the computer forms have been clinched together because the clinch holes may be detected as sprocket holes by the sensors and cause misregistration.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

Proposed Classification

SENSOR ASSEMBLIES FOR USE IN FEEDING CLINCHED COMPUTER U.S. C1.358/285 FORMS Int. C1. H04n 01/04
K. Amarakoon
S. May
J. Keeping
N. Prue
W. J. Wagner

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6

FIG. I

FIG. 2

3 2

FIG. 3

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992 175

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Page 2 of 6

SENSOR ASSEMBLIES FOR USE IN FEEDING CLINCHED COMPUTER FORMS(Cont'd)

FIG. 4

22

FIG. 5

FIG. 6

176 XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992

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SENSOR ASSEMBLIES FOR USE IN FEEDING CLINCHED COMPUTER FORMS(Cont'd)

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FIG. 7

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FIG. 8

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992 177

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Page 4 of 6

SENSOR ASSEMBLIES FOR USE IN FEEDING CLINCHED

COMPUTER FORMS(Cont'd)

In a feeder for handling computer forms which are to be copied, it is known to use one or more sensors to detect the sprocket holes in the forms. The output of the sensor($ can be used to monitor and/or control the passage of the computer form web through the copier. Problems can arise, however, when the computer forms have been clinched together because the clinch holes may be detected as sprocket holes by the sensors and cause misregistration.

The sprocket holes in computer forms are placed at regular intervals (usually

4 inch between centres) and are uniform in size, shape and position whereas clinch holes are usually placed at random and a greater distance apart and are irregular in shape and size.

A sensor assembly 1 that will detect the sprocket holes in computer forms without responding to the presence of clinch holes is illustrated in Figs.land 2 which are, respectively, a diagrammatic side view and an end view of the sensor assembly. The sensor assembly 1 comprises an infra-red emitter 2 and an infra-red detector 3 which are positioned below the path of the computer forms to be copied, and a light diverter 4 which is positioned above the path of the computer forms and extends between the emitter and the diverter. The spacing between the optical centres of the emitter 2 and detector 3 in the direction of movement of the computer forms is the same as the spacing of the sprocket holes in the computer forms.

In the absence of a computer form, light from the emitter 2 passes to the diverter 4, is deflected through 90" by reflection at a first face of the diverter, travels to the other end of the diverter where it is reflected through a further 90" at a second face and passes to the detector 3, causing the sensor 1 to emit an output signal. When a computer form 5 passes through the sensor 1 as shown in Fig. 1, the sensor will only emit an output when holes in the form are aligned with both the emitter and the detector. Sprocket holes 6 in the computer form will, accordingly, cause the sensor 1 to emit an output signal but typical clinch holes will not.

The sensor...