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End of Ribbon Switch, Thermal Transfer Ribbon Cleaner, And Tensioning Device for the Ribbon

IP.com Disclosure Number: IPCOM000041055D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hotz, KA: AUTHOR

Abstract

This device combines into one apparatus a means for detecting ribbon depletion, for cleaning the ribbon and for tensioning the ribbon, as shown in the Figures.

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End of Ribbon Switch, Thermal Transfer Ribbon Cleaner, And Tensioning Device for the Ribbon

This device combines into one apparatus a means for detecting ribbon depletion, for cleaning the ribbon and for tensioning the ribbon, as shown in the Figures.

The device includes a stationary curved piece 2, having a piece of felt 2A or other cloth material attached to the surface of the curved piece for contact with the ribbon to wipe the ribbon clean of dust. The curved piece is typically fixed to the printer. An L-shaped tensioning device 3, having upper and lower portions 3A, 3B, is biased in the direction of arrow A by a rod and torsion spring assembly
6. The upper portion 3A of the device 3 includes a tensioning spring 5 which rotates and applies the desired tension to the ribbon when the lower portion 3B of the tensioning device is hit by a ribbon cartridge 7 inserted into the printer.

The tensioning spring 5 is made of a conductive material such as copper, and since the end of the ribbon is also coated with a conductive material, when the spring and end of the ribbon come into contact, a circuit 8 can be closed and the printer is signaled that it is at the end of the ribbon. Alternatively, the springs, instead of forming an open/close circuit, can be grounded and thereby used to remove static electricity on the ribbon as it passes the tensioning device.

When the cartridge is lifted off the lower portion 3B, the torsion spring 6 returns the tensioning device 3 to i...