Browse Prior Art Database

Wide Wheel-Based Sprocket With Bidirectional Locking Insert for Forms-Feed Mechanisms

IP.com Disclosure Number: IPCOM000059901D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Kirk, RD: AUTHOR [+3]

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 58% of the total text.

Page 1 of 2

Wide Wheel-Based Sprocket With Bidirectional Locking Insert for Forms- Feed Mechanisms

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. The drive shaft rotates the sprocket that engages a tooth-form flexible belt which advances the forms. In prior art, considerable difficulty was experienced in the horizontal sliding movable tractor, since frictional forces and tolerance variations cause a cocking action which interfered with the proper movement of the tractor. The technique described herein incorporates a bidirectional locking insert on the end of a wide wheel-based sprocket, so as to provide a greater bearing surface in the direction of pull, thereby requiring a smaller force to move the tractor assembly from side...