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Tension Controlling Ribbon Apparatus

IP.com Disclosure Number: IPCOM000061859D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hunt, RE: AUTHOR

Abstract

An inexpensive apparatus to closely control the ribbon tension in a resistive ribbon type printer is shown above. The apparatus comprises a ribbon supply spool 8 wound about an inner core 9 which freely rotates on a printer carrier (not shown) in a conventional manner. Ribbon is threaded off spool 8, around roller 6, past print head 1, around roller 5, around ribbon tensioning arm roller 4, back around the periphery of spool 8, around drive roller 7 and pinch roller 10 to a take-up device, not shown.

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Tension Controlling Ribbon Apparatus

An inexpensive apparatus to closely control the ribbon tension in a resistive ribbon type printer is shown above. The apparatus comprises a ribbon supply spool 8 wound about an inner core 9 which freely rotates on a printer carrier (not shown) in a conventional manner. Ribbon is threaded off spool 8, around roller 6, past print head 1, around roller 5, around ribbon tensioning arm roller 4, back around the periphery of spool 8, around drive roller 7 and pinch roller 10 to a take-up device, not shown.

Roller 7 is rotated by a device, not shown, to meter the desired ribbon to the print head. The ribbon pulled by drive roller 7 wraps around spool 8 in the area shown by dotted line 9 and acts as a band clutch drive which rotates spool 8 feeding new ribbon to head 1. The amount of ribbon supplied from spool 8 is slightly less than that fed by roller 7 due to the difference in the radii of R1 and R2 and their respective circumferences. This difference helps compensate for the elastic stretch in the ribbon as it passes by the print head. This compensation is not exact, so occasionally (like the end of a page) it is necessary to reset tension roller arm 3 and spool 8 to their home positions.

Disclosed anonymously.

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