Browse Prior Art Database

Ribbon Drive for Minimum Use of One Time Ribbon

IP.com Disclosure Number: IPCOM000085819D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Meier, JM: AUTHOR [+3]

Abstract

The ribbon drive shown moves a typewriter ribbon 2 between a print element 10 and a sheet of paper 12. The paper is located on a platen 15. The used ribbon is wound upon a top spool 20 and the new ribbon is unwound from a bottom spool 22. Rewind spool 20 is driven by belt 25 from a drive roll 30 which is, in turn, frictionally driven by engagement with the paper 12 as the entire assembly is moved along the platen 15.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Ribbon Drive for Minimum Use of One Time Ribbon

The ribbon drive shown moves a typewriter ribbon 2 between a print element 10 and a sheet of paper 12. The paper is located on a platen 15. The used ribbon is wound upon a top spool 20 and the new ribbon is unwound from a bottom spool 22. Rewind spool 20 is driven by belt 25 from a drive roll 30 which is, in turn, frictionally driven by engagement with the paper 12 as the entire assembly is moved along the platen 15.

Behind print element 10, the ribbon 2 is in contact with the paper 12. In the position as shown, there is no relative motion between the ribbon 2 and the paper 12, because the friction between ribbon and paper exceeds the friction between the head 10 and ribbon.

Thus, as the head 10 moves across the paper 12 the ribbon 2 unwinds from the bottom spool 22 and winds onto the top spool 20. For high-speed tabulating, the entire assembly can be moved away from the paper 12 so that drive wheel 30 does not engage the platen 15 and play out any ribbon 2.

Guideposts 31, 32, and 33 are stationary. Their total angle of wrap provides the desired amount of frictional drag on the ribbon 2, so that even a very small force in the ribbon where it leaves the head 10 is amplified sufficiently at the point where it winds onto the take-up spool 20 to slip the belt drive 30. Roller 34 is free rolling. It is not attached to drive wheel 30.

Print element 10 can be a thermal print head which selectively heats a column of points...