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Browse Prior Art Database

Automatic Belt-Tensioning Device for a Two-Belt System

IP.com Disclosure Number: IPCOM000101332D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Cleveland, TW: AUTHOR [+2]

Abstract

Printer carriage drive systems consisting of multiple drive belts present a unique problem in simultaneously tensioning the belts equally. Disclosed herein is a system that automatically tensions two driven belts simultaneously by moving the drive motor in two dimensions under spring urging.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 93% of the total text.

Automatic Belt-Tensioning Device for a Two-Belt System

       Printer carriage drive systems consisting of multiple
drive belts present a unique problem in simultaneously tensioning the
belts equally.  Disclosed herein is a system that automatically
tensions two driven belts simultaneously by moving the drive motor in
two dimensions under spring urging.

      The tolerances associated with the tractor shaft-mounting
positions, pulley diameters, belt center distance and motor mounting
require motion in two directions to tension the belts.  Fig. 1 shows
a schematic representation of a printer carriage.  Points marked "A"
and "B" represent the nominal position of the tractor shaft pulleys.
Point marked "M" is the nominal position of the motor, and the point
marked "P" is the nominal pivot position of the motor.  The carriage
drive belts are located between the tractor shaft pulleys and the
motor.  Because of tolerances inherent in the manufacture of the
assembly the parts are seldom in the nominal positions.  Thus, in
order to tension both carriage drive belts equally, the motor must
move in two directions. This two-dimensional motion is produced by
using two springs, located at points S1 and S2.  The two springs, by
acting on opposite sides of the pivot (point "P"), provide the forces
necessary to cause the motor to both rotate and translate to take up
the slack and tension of both belts. Sufficient initial extension of
both springs is provided so that the sp...