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Independent Ribbon Feed Mechanism

IP.com Disclosure Number: IPCOM000119395D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Engle, VD: AUTHOR [+6]

Abstract

Disclosed is a mechanism to independently control page wide resistive ribbon feeding so that special ribbon functions can be performed. Printing with a soft platen (even air) is also accomplished.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Independent Ribbon Feed Mechanism

      Disclosed is a mechanism to independently control page
wide resistive ribbon feeding so that special ribbon functions can be
performed.  Printing with a soft platen (even air) is also
accomplished.

      The page-wide resistive ribbon feed consists of a supply spool
3 and a take up spool 4.  Ribbon 8 is draped across printhead 6.
Ribbon 8 is sandwiched between printhead 6 and paper 9.  Metering
roller 1 and supply spool 3 are spring loaded toward each other.
Similarly, take up roller 2 and spool 4 are spring loaded toward each
other. Roller 2 is slightly larger than roller 1, and roller 2 and
spool 4 can slip with respect to each other as the tension in ribbon
reaches a predetermined level.  Rollers 1 and 2 are driven by the
same motor 5 and ribbon is fed in one direction.

      The motor speed is set by a command from electronics. The
ribbon speed is constant during the feed cycle no matter how full or
empty the spools are.  As printing occurs, tension is created in the
ribbon because roller 2 tries to feed more than the metering roller
allows it to feed.  The tension will rise until it overcomes the
friction between roller 2 and spool 4.  At this time, slip occurs.
As the tension decreases, roller 2 will drive spool 4 again.  The
ribbon can be fed independent of the paper.  This allows for saving
ribbon by (1) feeding it slower than the paper and (2) stopping the
ribbon when there is nothing to be printed in c...