Design rules for image forming devices to prevent image distorti

Details Design rules for image forming devices to prevent image distorti Design rules for image forming devices to prevent image distorti

1992-06-17

1993-09-07

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355200, 355211, 355275, G03G 1501

Patent

active

052433960

ABSTRACT:
The present invention relates to design rules and geometric compensations for image forming devices. The inherent eccentricities of the photosensitive belts or drums and the timing belt speed reduction drive trains of image forming device cause misregistration of the developed latent images. To prevent such misregistration, the timing belt of the speed reduction drive train has a peripheral length which is selected from a range of values dependent on a preselected speed reduction ratio between the driven pulley and the driving pulley. Further, each one of the range of values is an integral improper fraction or integral multiple of the circumference of the driven pulley. Moreover, the driving pulley of the last pulley belt set coupled to the photosensitive member and a driven pulley prior to the last pulley belt set rotate n full rotations as the photosensitive member rotates from the image forming location to the image transfer location. In conjunction, every speed reduction ratio of all pulley belt sets prior to the last pulley belt set is an integer value. Thus, the eccentricities will be self-compensated.

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