Web Feed Servo Mechanism
Original Publication Date: 1980-May-01
Included in the Prior Art Database: 2005-Feb-13
The web-feed mechanism shown in the figure includes a mechanical servo operable in response to lateral displacement of a web from a desired feed path to skew a drive roller in a direction such as to correct a displacement error. The mechanism includes a differential torque amplifier through which the power gain required to overcome frictional forces is supplied to the mechanism.