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Resilient Tractor Pulley Mount

IP.com Disclosure Number: IPCOM000121615D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 3 page(s) / 102K

Publishing Venue

IBM

Related People

Schaefer, DB: AUTHOR [+3]

Abstract

Springs are commonly used to apply the proper tension to tractor belts. To compensate for the usual tolerance accumulations, the rate of these springs is low. To maintain acceptable print registration, the moveable parts on which these springs press are commonly locked in place once the proper tension has been applied to the tractor belts. If the moveable parts on which the springs are not locked in place, the tractor belt tension could disappear during printing, and unacceptable registration would result.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Resilient Tractor Pulley Mount

      Springs are commonly used to apply the proper tension to
tractor belts.  To compensate for the usual tolerance accumulations,
the rate of these springs is low.  To maintain acceptable print
registration, the moveable parts on which these springs press are
commonly locked in place once the proper tension has been applied to
the tractor belts.  If the moveable parts on which the springs are
not locked in place, the tractor belt tension could disappear during
printing, and unacceptable registration would result.

      The accumulation of debris on the pulley circumferences or
eccentricity of the circumference of either pulley has the effect of
increasing the apparent separation between the tractor belt pulleys.
If the tension member of the tractor is a relatively inelastic
material, such as steel, this apparent increase in the pulley
separation will greatly increase the tension in the belt.  This high
belt tension, especially when anticlastic deformations and pulley
tilt are considered, can over stress the belt tension member.

      To prevent over stressing of the tractor belt tension member,
additional elasticity must be introduced into the tractor belt
separation system.  This additional elastic member will have
sufficient stiffness so that it will not adversely affect print
registration, but yet be significantly more resilient than the
tractor belt tension member.  Two different design concepts to
achieve this objective are disclosed herein.

      The first design for a resilient idler pulley is shown in Fig.
1.  Belt 1 is entrained about drive pulley 5 and idler pulley 6.
Pulley 6 rotates about axle 7 which is supported by floating slide 8.
Belt tension is maintained by coil springs 9 and 10 which press
against flat spring 22 which, in turn, presses against floating sl...