Browse Prior Art Database

Missing Pin Tractor Belt

IP.com Disclosure Number: IPCOM000108074D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 3 page(s) / 85K

Publishing Venue

IBM

Related People

Schaefer, DB: AUTHOR [+2]

Abstract

Disclosed is a Tractor Belt design that minimizes the localized stresses at the belt weld or joint.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Missing Pin Tractor Belt

       Disclosed is a Tractor Belt design that minimizes the
localized stresses at the belt weld or joint.

      Figs. 1 and 2 shows the details of a typical low-cost forms
tractor feed belt.  The feed belt 1 contains a thin tension member 2
having holes (not shown) through which pins 3 and drive teeth 4 are
assembled, which move forms (not shown).  To facilitate
manufacturability (in a seamed belt), the belt (tension member) is
cut into a strip, the pins and teeth are joined to the strip, the
strip is formed into an endless loop and then a joint is made.

      With a typical seamed belt design, as shown in Figs. 1 and 2,
the joint is located midway between two adjacent pin/teeth.  When the
feed belt is formed around the pulleys, the joint is in a state of
bending.  The bending stress in the joint is inversely proportional
to the radius of curvature of the pulley (assuming no gap between the
belt and the pulley) and directly proportional to the load and belt
thickness.  Additional stresses can develop when pulley tilt and
debris (such as paper dust and manufacturing irregularities on the
pulley surface) exit.

      Fig. 3 shows the new design concept where one pin/tooth has
been removed from the belt and the belt joint has been moved to that
location.  By doing this, two benefits have been accomplished.
First, the radius of curvature of the belt at the joint location has
been increased, as shown below, thus lowering the joi...