Overridable worm gear drive for multicolor image forming apparat

Details Overridable worm gear drive for multicolor image forming apparat Overridable worm gear drive for multicolor image forming apparat

1991-04-15

1992-08-04

Grimley, A. T.

Photocopying

Contact printing

Light boxes

74665Q, 74724, 355200, G03G 2100, F16H 3706

Patent

active

051363321

ABSTRACT:
A multicolor image forming apparatus creates a series of different color toner images on a rotatable image member. The toner images are transferred in registration to a receiving sheet carried by a transfer drum. The transfer drum is driven by the image member during transfer but is driven by an independent overridable drive between images. The independent overridable drive includes a worm gear which engages a gear fixed to the transfer drum to rotate the transfer drum. The worm gear is mounted on a rotatable shaft which is driven by a stepper motor. The shaft rotates the worm gear but the worm gear can slide on the shaft or otherwise move axially. A shoulder limits axial movement providing positive drive for the transfer drum. When the image member contacts the receiving sheet and begins to drive the transfer drum it overrides the worm gear and the worm gear separates or floats away from the limiting shoulder. This overridable drive provides precise rotation when driving and permits smooth and non-cogging overriding.

REFERENCES:
patent: 3285083 (1966-11-01), Singer
patent: 4093056 (1978-06-01), Burgers
patent: 4215592 (1980-08-01), Calvert
patent: 4266444 (1981-05-01), Anderson et al.
patent: 4994827 (1991-02-01), Jamzadeh et al.
patent: 5021829 (1991-06-01), Johnson et al.
patent: 5021835 (1991-06-01), Johnson

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