Browse Prior Art Database

Low Cost/ Non-adjustable Band Tracking System for Band Printer

IP.com Disclosure Number: IPCOM000122598D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Fitzgibbons, PJ: AUTHOR [+2]

Abstract

Disclosed is a print band tracking system that requires no adjustments and uses very few parts. The axial position of the print band relative to the printer hammers is controlled by the axial position of the band and idler pulleys and their profiles.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Low Cost/ Non-adjustable Band Tracking System for Band Printer

      Disclosed is a print band tracking system that requires
no adjustments and uses very few parts.  The axial position of the
print band relative to the printer hammers is controlled by the axial
position of the band and idler pulleys and their profiles.

      The pulley profiles include a straight taper such that the
pulleys are widest at the lower end of the pulley.  The taper is 1/4
degree.  This 1/4 degree taper is used to cause the band to
continually seek a lower position on the pulley. There is a flange at
the bottom edge of the pulley that acts as a stop, to prevent the
band from moving any lower on the pulley.  This flange then controls
the axial position of the print band.

      By slightly canting the drive and idler pulleys such that their
tops are toward each other, the band will ride on the flange at a
condition that will promote little or no wear to either the print
band or the pulley flanges.  The permissible range of this cant is
large enough that the pulleys can be mounted without a cant
adjustment.  In some cases, simply mounting the pulley with no cant
is good enough because shaft deflection under band tension will
adequately cant the pulley.

      One problem caused by this design was that the band has greater
tension at the bottom edge of the band than at the top edge of the
band.  This caused the band to not rest solidly against the printing
platen.  To resolv...