Browse Prior Art Database

Temperature-Sensing Device for Hot Rolls

IP.com Disclosure Number: IPCOM000034232D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Fetner, JH: AUTHOR [+2]

Abstract

In certain copiers/printers utilizing hot roll fusing, the hot roll is in contact with the copy sheet during the fusing operation, but when a copy sheet is not present, the hot roll is physically moved away from its backup roll to prevent unnecessary wear. A device is described to measure and control the temperature of the hot roll in both of these positions, using a single temperature-sensing device. A desirable construction of the fuser allows the hot roll to be removed, for service and the like. The described device also facilitates removal of the hot roll. (Image Omitted) Temperature-sensing device 10 consists of shoes 11 and 12 mounted in housing 13. U.S. Patent 3,809,855 shows such an arrangement in greater detail. The curvature of shoes 11 and 12 mate with the outer circumference of hot roll 14.

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Temperature-Sensing Device for Hot Rolls

In certain copiers/printers utilizing hot roll fusing, the hot roll is in contact with the copy sheet during the fusing operation, but when a copy sheet is not present, the hot roll is physically moved away from its backup roll to prevent unnecessary wear. A device is described to measure and control the temperature of the hot roll in both of these positions, using a single temperature-sensing device. A desirable construction of the fuser allows the hot roll to be removed, for service and the like. The described device also facilitates removal of the hot roll.

(Image Omitted)

Temperature-sensing device 10 consists of shoes 11 and 12 mounted in housing 13. U.S. Patent 3,809,855 shows such an arrangement in greater detail. The curvature of shoes 11 and 12 mate with the outer circumference of hot roll
14. Shoe 11 is a graphite member containing a thermistor, and shoe 12 is a graphite member containing a thermal fuse which opens at a preset temperature limit. Housing 13 is attached to bracket 15, and pivots about pin 18. Bracket 15 is attached to bracket 17. Bracket 17 is attached to base member 19, and pivots about pin 20. Torsion spring 21 is mounted on pin 20. One end of spring 21 is mounted on base member 19, and the other end engages pin 18. Tab 22 on base member 19 limits rotation of bracket 17. In operation, when hot roll 14 is in the fusing position (the position shown in Fig. 1), sensing mechanism 10 is held against h...