Browse Prior Art Database

RIBBON MOVEMENT - ALTERNATE DRIVES

IP.com Disclosure Number: IPCOM000023173D
Original Publication Date: 1976-Dec-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

A DC servo~controlledmotor system is used to provide a directional rotation torque for accurate positioning of a mechanism. In the figure, a motor 2, when driven in the forward direction, rotates a cam 3 against a spring~biased pawl 4~ The in~and~outcarnmed movement of the pawl is sensed by an optical sensor 5~ When the correct number of steps are taken as counted by the sensor, the motor reverses direction and the cam biases against the pawl with a holding current, thus providing an accurate reference point~