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SELF-CAMMING FUSER

IP.com Disclosure Number: IPCOM000024849D
Original Publication Date: 1982-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to a self-camming fuser 10 for use in a xerographic copier. Upon actuation of a main drive motor (not shown), a fuser drive chain or belt 12 is pulled with enough force to overcome a torque transmitter (not shown). The drive chain tension rotates a drive side loading arm 14 about a pivot shaft 16 by virtue of the resultant force on an idler sprocket 18. The torque transmitter rotates the outboard side loading arm (not shown) in the same manner. A shaft (not shown) connects the drive side loading arm to the outboard loading arm to evenly distribute torque. Since the distances between the sprockets and a pressure roll 20 vary as the arms rotate, a low rate take-up spring 21 is necessary to control chain slack. When the main drive motor stops, the nip force exerted between a relatively soft fuser roll 22 and the pressure 20 will unload the rolls. The unloading springs 24 (only one shown) serve this purpose, the unloading springs keeping the rolls apart. If the system were turned upside down the unloading springs would not be necessary.

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Page 1 of 2

'EROX DISCLOSURE JOURNAL

SELF-CAMMING FUSER Borden H. Mills I11

A

Proposed Classification
U.S. C1. 355/3 FU Int. C1. G03g 15/00

Volume 7 Number 3 May/June 1982 173

/6

f

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Page 2 of 2

SELF-CAMMING FUSER (Cont'd)

This disclosure relates to a self-camming fuser 10 for use in a xerographic copier. Upon actuation of a main drive motor (not shown), a fuser drive chain or belt 12 is pulled with enough force to overcome a torque transmitter (not shown). The drive chain tension rotates a drive side loading arm 14 about a pivot shaft 16 by virtue of the resultant force on an idler sprocket 18. The torque transmitter rotates the outboard side loading arm (not shown) in the same manner. A shaft (not shown) connects the drive side loading arm to the outboard loading arm to evenly distribute torque. Since the distances between the sprockets and a pressure roll 20 vary as the arms rotate, a low rate take-up spring 21 is necessary to control chain slack. When the main drive motor stops, the nip force exerted between a relatively soft fuser roll 22 and the pressure 20 will unload the rolls. The unloading springs 24 (only one shown) serve this purpose, the unloading springs keeping the rolls apart. If the system were turned upside down the unloading springs would not be necessary.

The torque transmitter, located between the drive roll and the outboard loading arm, can be a paddle wheel running in a high viscosity oil bath to pr...