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Browse Prior Art Database

Optical Sensor Mount for Forms Tractor

IP.com Disclosure Number: IPCOM000035281D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 4 page(s) / 142K

Publishing Venue

IBM

Related People

Duncan, RR: AUTHOR [+2]

Abstract

Optical transducer housings for forms tractors can be fabricated with locating projections asymmetrically positioned with respect to tractor feed pins to enable the transducers to be offset when mounted on either upper or lower tractors to function optionally as forms motion detectors or end-of-forms detectors. (Image Omitted)

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Optical Sensor Mount for Forms Tractor

Optical transducer housings for forms tractors can be fabricated with locating projections asymmetrically positioned with respect to tractor feed pins to enable the transducers to be offset when mounted on either upper or lower tractors to function optionally as forms motion detectors or end-of-forms detectors.

(Image Omitted)

In Fig. 1, forms feed tractor 1 typically has frame 2 with relatively rotatable drive pulley 3 and idler pulley (not shown) for driving feed belt 4 with pins 5 engaging feed holes 6 in the paper forms. Door 7 can be hinged on either the front or back of the tractor and closes to hold the forms on the pins. This permits the tractors to be used on either side of the forms and inverted. An optical sensor 8 for detecting either forms motion or end-of-forms is attached to one end 10 of the tractor frame by spring clip 11 and held in lateral position by locating projections 12.

(Image Omitted)

As shown in Fig. 2, sensor 8 is offset with respect to the vertical centerline 13 of the housing. When housing 9 is affixed to the top of a tractor located above the print line on the left of the forms, the sensor is in line with feed holes 6, functioning as a forms motion detector. When an identical sensor housing 9 is secured to the bottom of a left tractor inverted and rotated 180o and placed below the print line, its sensor 8 lies between feed holes 6 and tear strip perforations 14 functioning as an end-of-forms de...