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High Speed Mechanical Incrementer

IP.com Disclosure Number: IPCOM000094874D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 95K

Publishing Venue

IBM

Related People

Burns, RC: AUTHOR

Abstract

Five modes of operation are performed by this incrementer. The output shaft can free wheel, increment CW at a fixed pitch, increment CCW at a fixed pitch, rotate CW continuously, and rotate CCW continuously. Rotatable output shaft 10 has a pair of axially spaced ratchet drive wheels 11 and 12 fixed to it. Right drive pawl 13 is pivotally carried in alignment with ratchet 11 by drive yoke 14 and pivot pin 51 loosely mounted on shaft 10. Left drive pawl 15 is pivotally carried in alignment with ratchet 12 by drive yoke 16 and pivot pin 52 also loosely mounted on shaft 10.

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High Speed Mechanical Incrementer

Five modes of operation are performed by this incrementer.

The output shaft can free wheel, increment CW at a fixed pitch, increment CCW at a fixed pitch, rotate CW continuously, and rotate CCW continuously. Rotatable output shaft 10 has a pair of axially spaced ratchet drive wheels 11 and 12 fixed to it. Right drive pawl 13 is pivotally carried in alignment with ratchet 11 by drive yoke 14 and pivot pin 51 loosely mounted on shaft 10. Left drive pawl 15 is pivotally carried in alignment with ratchet 12 by drive yoke 16 and pivot pin 52 also loosely mounted on shaft 10.

The position shown is for CCW output shaft motion. A pair of drive rods 17 and 18, shown nearing the upper or advanced position, is reciprocated in unison in frame 19 by a drive device, not shown. Rods 17 and 18 are urged toward the down or restored position by springs 20 and 21. Pawl 13 has pivot connection 22 with the upper end of drive link 23 centrally pivoted on drive pin 24 carried by rod
17. The lower end of link 23 has pivot connection 25 with one end of direction control link 26. The other end of 26 is connected to horizontally slidable right direction lever 27 by pin 28 movable in slot 29. Similarly, pawl 15 has pivot connection 30 with the upper end of drive link 31 which is centrally pivoted on drive pin 32 carried by rod 18. The lower end of link 31 has pivot connection 33 with one end of left direction control link 34. This is connected to horizontally slidable left direction lever 35 by pin 36 in slot 37. Links 26 and 34 are connected together by common bias spring 38. Rods 27 and 35 are positioned by sector cams 39 and 40 operating on pins 41 and 42 when rotated on control shafts 43 and 44, respectively.

Detent 45, slidably supported in frame 19, is connected to bell crank 46 which in turn is connected to drive rod 47 by pinned joints. Bell crank 46 pivots on frame mounted pin 53. The detent is urged into the withdrawn position by spring
54. Rod 47 is reciprocated as required by a drive device, not shown.

Incremental motion is imparted to shaft 10 by simultaneously actuating pawls 13 and 15 on yokes 14 and 16 as the yokes are oscillated in opposite directions with respect to shaft 10. The direction of incremental advance is controlled by the position of pins 28 and 36 relative to center line 50.

On the upward advance stroke of drive rods 17 and 18, CCW rotation of shaft 10 occurs. Link 23 on rod 17 pushes pawl 13 which, in turn, pushes ratchet 1 1 rotating shaft 10 CCW. Pawl 13 is maintained in contact with ratchet 11 by...