VARIABLE SPEED SCAN DEVICE
Original Publication Date: 1983-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In a multi rate scan system it is often desirable to alter the scan velocity of one or more internal optical devices. The figure illustrates a system providing an infinitely variable scan velocity from a constant input speed. In the figure, the scanning carriage 10 has a vertical yoke member 12 fixed to its bottom. The yoke and thereby the scanning carriage is driven to the right by a pin in the yoke slot which is attached to a timing belt 14 which is driven by constant velocity input pulley 16 around the idler roll 18. The horizontal component of velocity of the pin fixed to the belt may be altered by moving the idler roll vertically up or down relative to the fixed input pulley according the relation Vc.= Vklt cos 0. Thus, the velocity of the carriage may be changed simply by changing e value H. With a system of this type only a simple motor running at a constant speed may be required in an office copier.