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Through the Glass Document Sensing Device

IP.com Disclosure Number: IPCOM000061379D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barela, DA: AUTHOR [+4]

Abstract

In a copier utilizing a document feeder, a design is described to detect the leading edge of a document by using a photo sensor operating through the copier's document glass.

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This is the abbreviated version, containing approximately 100% of the total text.

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Through the Glass Document Sensing Device

In a copier utilizing a document feeder, a design is described to detect the leading edge of a document by using a photo sensor operating through the copier's document glass.

In Fig. 1, a front view, document 10 is fed by a servo controlled document belt 11 toward a desired registration point on document glass 12. The leading edge 30 of document 10 is detected by intercepting a light beam provided by infrared light source 13 and infrared sensor 15. The resulting signal is used to control the motion of document belt 11.

Fig. 2 is a right-hand end view of Fig. 1. The side edge of document 11 is preregistered to side reference edge 14. In the document feeder, a narrow fixed spacer 15A is located relative reference edge 14 and spaces belt 11 from this reference edge, so that less than a full width of document 10 is driven by document belt 11. Spacer 15A is provided with an opening 31 to allow passage of the photo beam which will be intercepted by the leading edge of the driven document.

Sensor 15 and light source 13 are located at a suitable angle so that sensor 15 is not in the optical path of the illumination provided by the copier's scan mirror 17. Sensor 1 provided with an aperture 16 with a high aspect ratio, to thereby reduce stray illumination from entering the sensor.

Disclosed anonymously.

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