Browse Prior Art Database

Compressible Ribbon Roller for Constant Tension

IP.com Disclosure Number: IPCOM000051791D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Craft, JA: AUTHOR

Abstract

A compressible roller is mounted near the ribbon exit of a cartridge. As the ribbon vibrator mechanism moves the ribbon at the print area, the roller changes shape to neutralize vertical forces on the ribbon. The tendency for a ribbon to creep vertically is neutralized without linkage mechanisms to compensate for the movement of the ribbon vibrator.

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Compressible Ribbon Roller for Constant Tension

A compressible roller is mounted near the ribbon exit of a cartridge. As the ribbon vibrator mechanism moves the ribbon at the print area, the roller changes shape to neutralize vertical forces on the ribbon. The tendency for a ribbon to creep vertically is neutralized without linkage mechanisms to compensate for the movement of the ribbon vibrator.

Fig. 1 shows the side of a cartridge 1 (shown in dotted outline to emphasize the internal parts) carrying a supply spool 3 delivering ribbon 5 leftwardly, as shown by the arrows. A shock wire 6 is secured within the cartridge 1 and extends to the side of the cartridge, where a bend disposes an end vertically.

The vertical end of wire 6 supports the roller 7, which may be of foamed plastic, brush material, or the like. The ribbon lift guide 9 is spaced away from the roller 7 and is moved up and down to vibrate ribbon 5, along with an identical guide (not shown) on the side of the print station opposite guide 9.

Fig. 2 shows a sectional view of roller 7 with ribbon 5 in the down position. Roller 7 collapses in response to the forces from ribbon 5, primarily at the top with substantially no compression at the bottom. Fig. 3 is a similar view with the ribbon vibrated to the extreme up position. In response to the forces of ribbon 5, roller 7 collapses primarily at the top with substantially no compression at the bottom.

Roller 7 rolls with the ribbon as it is fed during typi...