Browse Prior Art Database

RIBBON TENSION CONTROL

IP.com Disclosure Number: IPCOM000023174D
Original Publication Date: 1976-Dec-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 258K

Publishing Venue

Xerox Disclosure Journal

Abstract

A typewriter ribbon cartridge with a device for maintaining uniform ribbon tension is shown in the figure. Ribbon 18 is pulled from ribbon supply 19 to provide fresh portions of ribbon at station 20. As the ribbon 18 emerges from supply 19, it passes around a guide post 21 and comes into functional contact with end 22 of drag element 23. Post 21 is positioned at such a location that the angle of contact between end 22 and ribbon 18 remains substantially constant during depletion of ribbon supply 19. Drag element 22, which preferably is of a felted or fibrous material, is mounted on posts 24, 25. As the ribbon moves across end 22, the end moves in the direction of ribbon travel and tends to continue to move until the restoring force (resulting from the elasticity of the material comprising drag element 23) within element 23, caused by its binding or distortion, exceeds the frictional forces between ribbon 18 and end 22. When this condition is reached, end 22 of element 23 will halt its movement with the ribbon 18 and the ribbon will slide on the surface of end 22.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

RIBBON TENSION CONTROL
ProposedJack L. Kern Classification

U.S. Cl, 197/151

mt. Cl. B41j 33/14

19

A typewriter ribbon cartridge with a device for maintaining
uniform ribbon tension is shown in the figure. Ribbon 18
is pulled from ribbon supply 19 to provide fresh portions
of ribbon at station 20. As the ribbon 18 emerges from
supply 19, it passes around a guide post 21 and comes into
functional contact with end 22 of drag element 23. Post 21
is positioned at such a location that the angle of contact
between end 22 and ribbon 18 remains substantially constant
during depletion of ribbon supply 19. Drag element 22,
which preferably is of a felted or fibrous material, is
mounted on posts 24, 25. As the ribbon moves across end 22,
the end moves in the direction of ribbon travel and tends
to continue to move until the restoring force (resulting
from the elasticity of the material comprising drag element
23) within element 23, caused by its binding or distortion,
exceeds the frictional forces between ribbon 18 and end 22.
When this condition is reached, end 22 of element 23 will
halt its movement with the ribbon 18 and the ribbon will
slide on the surface of end 22.

Volume I Numbers 11/12 November/December 1976 39

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Page 2 of 2

40 XEROX DISCLOSURE JOUR~L

Volume 1 Numbers 11/12 November/December 1976

[This page contains 1 picture or other non-text object]