Wide Wheel-Based Sprocket With Bidirectional Locking Insert for Forms-Feed Mechanisms
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
A technique is described whereby a bidirectional locking insert is incorporated into a wide wheel-based sprocket of forms-feed tractor mechanisms, so as to provide a smooth sliding surface and greater tractor stability, as well as to provide greater accuracy of print registration. A pair of forms-feed tractors, used to convey forms through printers, must have the ability to handle forms of varying widths as well as to provide the required driving and tensioning elements to accurately position the forms for proper print registration. The left-hand tractor is usually fastened to a side frame member while the right-hand tractor is allowed to be positioned horizontally to compensate for the variations in paper widths. A drive shaft and a support shaft establish the longitudinal position of the tractor.