Browse Prior Art Database

Dual Scale Travel Sensor

IP.com Disclosure Number: IPCOM000087267D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Dillon, BC: AUTHOR [+3]

Abstract

There are two measurement systems in use for paper forms, the inch-foot, etc., system and the metric system. It is desirable to provide printers or similar devices with sensing devices for the printer carriage capable of measuring the carriage travel in either system of measurement to enable use of the device with either paper form.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 2

Dual Scale Travel Sensor

There are two measurement systems in use for paper forms, the inch-foot, etc., system and the metric system. It is desirable to provide printers or similar devices with sensing devices for the printer carriage capable of measuring the carriage travel in either system of measurement to enable use of the device with either paper form.

The sensor described herein can be selectively set to measure motion of a carriage in increments of either measurement system. In Fig. 1, a worm 5 on a shaft 6 will be driven to move a carriage (not shown). Shaft 6, mounted in bearings 7 in the sides of a box 8, carries a gear 9 mounted thereon in the box 8. A parallel shaft 10 in bearings 11 in the sides of box 8 carries a pinion 13 meshing with gear 9 and has two slotted discs 14 and 15 secured to the shaft 10 on opposite sides of a divider 16. Lamps 18 and 19 are mounted outside of discs 14 and 15, respectively, and the light from each lamp is passed through the associated disc, through an opening in divider 16 and then deflected, as by a mirror 20, to a photo cell 21.

Assuming that one revolution of shaft 6 will move the carriage a distance of one inch, that gears 9 and 13 provide a 10-1 step-up drive to shaft 10 and that disc 14 has 200 slots, carriage movement can be measured in increments of
.0005 inches. With 254 slots in disc 15, the carriage movement increments can be measured to .01 millimeter.

The sensed increments can be used in a circuit, as in F...