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HEAT AND PRESSURE ROLL FUSER AND ROLL ENGAGING MECHANISM THEREFOR

IP.com Disclosure Number: IPCOM000025660D
Original Publication Date: 1987-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 222K

Publishing Venue

Xerox Disclosure Journal

Abstract

Mechanism for effecting pressure engagement between two roll fuser members used for fusing toner images to copy substrates. The mechanism is characterized by simplicity of design and serviceability. To this end, one of two roll fuser members is supported on bearing surfaces such that it is lifted or raised upwardly through engagement with the other fuser member as it is moved upwardly. Upward movement of the last mentioned roll is effected by a pair of lever arms which serve as the support for that roll. Each lever arm is operatively attached to an over-center toggle structure which is actuatable either by rotary or linear motion of an actuator mechanism.

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XEROX DISCLOSURE JOURNAL

HEAT AND PRESSURE ROLL FUSER AND ROLL ENGAGING MECHANISM THEREFOR Int. C1. G03g 15/00 Jack 0. Wilson

Proposed Classification
U.S. C1.355/3FU

Volume 12 Number 1 January/February 1987 29

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HEAT AND PRESSURE ROLL FUSER AND ROLL ENGAGING MECHANISM THEREFOR (Cont'd)

30

a0 '-2

FIG. 4

    XEROX DISCLOSURE JOURNAL Volume 12 Number 1 January/February 1987

[This page contains 1 picture or other non-text object]

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HEAT AND PRESSURE ROLL FUSER AND ROLL ENGAGING MECHANISM THEREFOR (Cont'd)

Mechanism for effecting pressure engagement between two roll fuser members used for fusing toner images to copy substrates. The mechanism is characterized by simplicity of design and serviceability. To this end, one of two roll fuser members is supported on bearing surfaces such that it is lifted or raised upwardly through engagement with the other fuser member as it is moved upwardly. Upward movement of the last mentioned roll is effected by a pair of lever arms which serve as the support for that roll. Each lever arm is operatively attached to an over-center toggle structure which is actuatable either by rotary or linear motion of an actuator mechanism.

An adjustment device is provided for varying the load applied to the rolls.

Referring to Figures 1 through 4, it can be seen that the fuser 57 includes a heated fuser roll 70 and a pressure roll 72 which can be heated or not heated depending on the machine in which it is used. An elongated nip 71 of the type well known in the art is formed between the fuser and pressure rolls. The relatively high (i.e. 400 pounds total force on roll) pressure required to create the nip is effected by a latch mechanism generally indicated by reference character 73. The latch mechanism 73 includes a pair of over-center toggle structures generally indicated by the reference characters 74,75, a pair of support arms 76,77 operatively attached to the toggle members and adapted to support the roll member in various positions and a latch actuating device generally indicated by the reference character 78. Each of the toggle members 74,75 comprises a compression springs 80 ,81 which are concentrically mounted internally of a generally tubular shaped housing or toggle link 82.

Each of the springs 80 is retained by a pair of washers 84,85 disposed internally of the tubular shaped housing 82 which, in turn, is retained by a pair of shafts 86,87 which are inserted through apertures 88,89 and 92,93 in the tubular shaped housing. The shafts are provided with notched or flat areas 90 for receiving the washers 84,85. One of the springs 80, a pair of washers and a pair of shafts are assembled into one of the tubular shaped housings by inserting shaft 87 through two aligned apertures 88,89 followed by insertion of one of the washers 84,85 and then one of the springs 80 through one end of the tubular housing, after which the other washer is inserted...