Browse Prior Art Database

2 3 6 Lines Inch Platen Indexing Method

IP.com Disclosure Number: IPCOM000082657D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Becker, FR: AUTHOR

Abstract

To insure proper meeting of the line feed index pawl and the ratchet attached to the end of the platen for a typewriter, and to provide for the selectability necessary to feed 2, 3 or 6 lines per inch, it is desirable that the pawl of the line feed mechanism enter the ratchet from the same angle, and thus engage the ratchet teeth at the same angle regardless of the amount of feed to be accomplished.

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2 3 6 Lines Inch Platen Indexing Method

To insure proper meeting of the line feed index pawl and the ratchet attached to the end of the platen for a typewriter, and to provide for the selectability necessary to feed 2, 3 or 6 lines per inch, it is desirable that the pawl of the line feed mechanism enter the ratchet from the same angle, and thus engage the ratchet teeth at the same angle regardless of the amount of feed to be accomplished.

A device for accomplishing this is shown in Fig. 1. Line feed control lever 10 is mounted pivotally on a pivot rod 12 and is linked to line selector guide 14. Line selector guide 14 is slidably engaged with stud 16 in groove 18. This provides for a front-back movement of the line selector guide 14. Also incorporated in guide 14 is a guide surface 20. This guide surface is slidably engaged with guide stud 22 on line feed pawl 24.

Line feed pawl 24 is pivotally attached at 26 to bell crank 28.

Bell crank 28 receives its motion input from link 30. Downward motion of link 30 will propel line feed pawl 24 rightward, thus tending to engage it with the ratchet 34 on the end of the platen of the typewriter.

The two controlling locating points which act to position the guide member 14, are pivot 32 and slot 18. Slot 18 becomes a locating point when considered with respect to stud 16. The two points 32 and 18 combined with stud 16 define the position of guide slot 20.

With this knowledge and the particular typewriter involved, it is possi...