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US 4,785,325 AGranted
Adjustable speed control for a document imaging system
AssigneeXerox Corporation
InventorsWilliam E. Kramer, John E. Forward
Life of this patent
Estimating the term…
Abstract
A document imaging system incorporates a mechanism for adjusting the speed ratio between the document scanning system and the photoreceptor. A timing belt is connected between an adjustable tapered portion of a drive pulley mounted on the photoreceptor drive shaft and the document scanning system. The portion of the tapered surface on which the belt is frictionally is axially adjustable resulting in a change in the effective diameter of the belt and a change in the scanning speed.
Claims5
In a document imaging system, in combination,
- means for moving a document across an exposure zone formed in an object scanning plane,
- means for projecting a flowing light image of the document onto the surface of a photoreceptor moving at the same speed as the document,
- an adjustable pulley speed mechanism connected to the moving photoreceptor and adapted to be driven at the same rotational speed,
- a timing belt frictionally entrained between said pulley mechanism and said document moving means and
- means for changing the effective diameter of said pulley mechanism so as to effect a change in the speed of the document movement across the exposure zone.
2 more elements
Dependencies are inferred from the claim text.