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Incremental Drive Mechanism

IP.com Disclosure Number: IPCOM000098380D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Wilson, LA: AUTHOR [+2]

Abstract

A mechanism provides controllable incremental motion in either of two directions for a punch card or similar load. The motive power is supplied through a shaft 10 to drive a pair of cams 11, 12. Cam 12 drives a pair of pawl actuating arms 13, 14 which carry spring pawl members 15, 16 and which work against springs 17, 18. The ends of the pawls 15, 16 engage notches 19 in a two element notched ratchet 20 which drives a feed roll 21 through a shaft 22. The card 23 is driven by the pressure of an idler roller 24 working against the feed roll 21.

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Incremental Drive Mechanism

A mechanism provides controllable incremental motion in either of two directions for a punch card or similar load. The motive power is supplied through a shaft 10 to drive a pair of cams 11, 12. Cam 12 drives a pair of pawl actuating arms 13, 14 which carry spring pawl members 15, 16 and which work against springs 17, 18. The ends of the pawls 15, 16 engage notches 19 in a two element notched ratchet 20 which drives a feed roll 21 through a shaft 22. The card 23 is driven by the pressure of an idler roller 24 working against the feed roll
21.

As cam 12 rotates, pawls 15, 16 are moved by pawl actuating arms 13, 14 into and out of engagement with notches 19 in opposite phase so that ratchet 20 is driven back and forth in equal increments of motion, producing an oscillating motion of the card. The notches 19 have parallel sides for a substantial portion of their depth so as to retain the pawls in them for a substantial portion of the drive cycle. This results in maximum transfer of energy from the decelerated parts to springs 17, 18. Pawl actuating arms 13, 14 may be selectively latched out of operation by associated control magnets 25, 26 to prevent the latched pawl from driving ratchet 20. Under these circumstances, ratchet 20 is driven in one direction in equal increments by the unlatched pawl while the latched pawl oscillates in and out of a notch in opposite phase to the unlatched pawl.

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