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Browse Prior Art Database

Forward and Reverse Indexing Mechanism

IP.com Disclosure Number: IPCOM000091780D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

O'Daniel, JB: AUTHOR [+3]

Abstract

Platen 10 is rotated full-line-space forward increments by ratchet 12 and half-line-space rearward increments by ratchet 11 through selective operation of respective pawls 14 and 13. Drive for pawls 14 and 13 is obtained from keyboard-operated cam 15. This rotates follower 16 counterclockwise driving floating lever 17 downwardly at its center. Two-position control stop 18 intercepts one or the other end 19 or 20 of lever 17 as determined by the state of activation or not of electromagnet 21. Interception of one end of lever 17 causes pivotal movement of such lever about the point of interception and induces output movement of its opposite end and of the output link 22 or 23 connected to it. Link 23 is connected to pawl 14.

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Forward and Reverse Indexing Mechanism

Platen 10 is rotated full-line-space forward increments by ratchet 12 and half-line-space rearward increments by ratchet 11 through selective operation of respective pawls 14 and 13. Drive for pawls 14 and 13 is obtained from keyboard-operated cam 15. This rotates follower 16 counterclockwise driving floating lever 17 downwardly at its center. Two-position control stop 18 intercepts one or the other end 19 or 20 of lever 17 as determined by the state of activation or not of electromagnet 21. Interception of one end of lever 17 causes pivotal movement of such lever about the point of interception and induces output movement of its opposite end and of the output link 22 or 23 connected to it. Link 23 is connected to pawl 14. A stroke is generated by it for indexing ratchet 12 two teeth and thus producing a full-line space in the forward direction. Link 22 connects through linkage 25 to pawl 13. A stroke of link 22 causes pawl 13 to advance one tooth on ratchet 11 and produce a one half space in the reverse direction. By combining sequences of half, reverse and full forward line spacing operations, platen 10 is positioned one half space above or one half space below a writing line for printing superscripts and subscripts. Double line spacing is achieved by actuating the forward index operation twice for each keyboard input.

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