Browse Prior Art Database

Typewriter Ribbon Feed

IP.com Disclosure Number: IPCOM000096639D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 99K

Publishing Venue

IBM

Related People

O'Daniel, JB: AUTHOR [+2]

Abstract

This typewriter ribbon feed mechanism is for obtaining maximum use from a ribbon which is fed once through the machine.

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Typewriter Ribbon Feed

This typewriter ribbon feed mechanism is for obtaining maximum use from a ribbon which is fed once through the machine.

To change a ribbon the typist pulls bail 10 forwardly. An offset portion 11 pulls link 12 to rotate member 13. This presses against lift member 14, and ribbon guides 15 are raised above single head typing element 16. A projection on member 13 engages one arm of pressure feed roll mounting bracket 17 to move a pressure feed roll 18 away from and into spaced relation with respect to driven feed roll 19. The other arm of bracket 17 engages supply drag lever 20 and pivots this outwardly to the edge of supply reel flange 21. The used ribbon is then removed and discarded. Spool 22 about which the supply roll of the new ribbon is wound is placed on supply mounting shaft 23 and an empty takeup spool is inserted over takeup mounting shaft 24. The ribbon is passed through guides 15 and between feed rolls 18 and 19. Bail 10 is moved to its original position and the new ribbon is loaded.

Ribbon feeding is effected by rotation of print feed cam 25 mounted on shaft 26 driven by the typewriter motor, not shown. Rotation of cam 25 moves cam follower 26, link 27 and feed pawl 28 to advance cam ratchet wheel 29 through a predetermined angular distance. Movement of wheel 29 is transmitted to feed roll 19 via shaft 30. At the same time, power is transmitted to rotate the shaft 24 by pulleys 31 and spring belt 32. The ratio of pulleys 31 is such that belt 32 always drives more than the amount of ribbon fed to insure a tight wind of the ribbon on the takeup spool.

The change of the ribbon lift position each print cycle is accomplished by changing the position of...