Patent Number: 6,253,046

Title: Multi-functional fuser backup roll release mechanism

Abstract: A multi-functional fuser backup roll release mechanism and operating process are defined. In the event of a paper jam, the primary gear train from a prime mover to driven rolls of the imaging apparatus is interrupted, and a secondary drive train is engaged. The drive train operates a drive shaft, rotating a worm gear to control a cam and lever apparatus connected to springs and bellcranks at opposite ends of the backup roll. Upon the detection of a paper jam, or prolonged inactivity of the fuser, the nip between the fuser hot roll and backup roll is opened. During normal operation, the mechanism can be used to control the nip force between the fuser roll and the backup roll, to provide the optimal nip load for the media being processed, and the print glossiness desired.

Inventors: Horrall; Paul Douglas (Lexington, KY), Meade; Alexander Douglas (Lexington, KY), Rush; Edward Alan (Lexington, KY), Yosmali; Krikor (Lexington, KY)

Assignee: Lexmark International, Inc.

International Classification: G03G 15/20 (20060101); G03G 015/00 (); G03G 015/20 ()

Expiration Date: 06/26/2018