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COMPENSATION OF RIBBON TENSIONING DEVICE BY SPIKE PLATE MOTION

IP.com Disclosure Number: IPCOM000024115D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 450K

Publishing Venue

Xerox Disclosure Journal

Abstract

A ribbon tensioning device for a printer is disclosed, which achieves a constant ribbon tension independent of factors such as the changes in radius of the amount of ribbon on the supply spool, changes in the brake coefficient of friction, etc.

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

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XEROX DISCLOSURE JOURNAL

COMPENSATION OF RIBBON TENSIONING ~OTION

~ocIer

Proposed Classification
U.S. Cl. 197/151

mt. Cl. B41j 33/14

A ribbon tensioning device for a printer is disclosed, which achieves a constant ribbon tension independent of factors such as the changes in radius of the amount of ribbon on the supply spool, changes in the brake coefficient of friction, etc.

An efficient ribbon tensioning system is needed in an impact printer to provide constant tension on the ribbon, to assist in accurate location of the ribbon and to

prevent any unwanted interference between the ribbon and the print element.

With reference to the figure, the supply spool of ribbon (not shown) is positioned on flange 10 and around drive shaft 11. The take-up spool for the ribbon (not shown) is positioned on flange 12 and around shaft 13. The supply spool of ribbon, the take-

up spool for the ribbon, the ribbon and the ribbon path between the supply spool and the take-up spool are not shown in an attempt to keep the figure from becoming

confusing due to an overabundance of lines, The ribbon drive means comprises a driven spike wheel 14, which is rotatable about shaft 15 with shaft 15 being

mounted to spike plate 16. Means (not shown) for driving the spike wheel 14 can be a conventional motor and gear train. Spike plate 16 pivots about axis 17, which

allows spike wheel 14 to maintain contact with the outer periphery of the ribbon on the take-up spool. Spike wheel 14 is biased against the outer periphery of the ribbon and wound onto the ribbon take-up spool by spring force 18.

Volume 4 Number 5 September/October 1979 589

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COMPENSATION OF RIBBON TENSIONING DEVICE BY SPIKE PLATE MOTION (Cont!d)

The brake system for the ribbon supply spool comprises arm 19 mounted for pivotal movement at point 20. Brake pin 21 projects upwardly from arm 19 such that when arm 19 is pivoted clockwise, brake pin 21 contacts the edge of flange 10 to apply a braking action to the rotation of flange 10. Arm 22 is attached to and protrudes from arm 19 and has a vertical extension 23 at the outer end thereof. One end of a spring F (not shown) is attached to arm 19 at pin 24 to supply the force for the braking tystem and force brake...