Image-forming machine

Details Image-forming machine Image-forming machine

1999-03-29

2000-05-23

Grimley, Arthur T.

Electrophotography

Image formation

Transfer

399297, G03G 1501

Patent

active

060674369

ABSTRACT:
An image-forming machine includes an image-forming unit, a transfer belt assembly disposed beneath the image-forming unit so as to freely ascend and descend between an acting position and a non-acting position, and a lift device for asending and descending the transfer belt assembly. The transfer belt assembly includes a driven roller, a tension roller, an endless belt wrapped around the driven roller and the tension roller, and a resilient urging device for resiliently urging the tension roller toward a direction of applying tension to apply tension to the endless belt. A tension release device is disposed which, when the transfer belt assembly is descended to the non-acting position, moves the tension roller in the direction in which tension is no longer applied, against a resilient urging action of the resiliently urging device, so that the application of tension to the endless belt is discontinued. A tension release invalidation device is further disposed to invalidate the tension release action of the tension release device upon detecting the manual operation for drawing out the image-forming unit from a required acting position when the tension release device discontinues the application of tension to the endless belt.

REFERENCES:
patent: 5291252 (1994-03-01), Kawaishi
patent: 5517290 (1996-05-01), Marumoto et al.
patent: 5602634 (1997-02-01), Uchida et al.

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