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Varied Incremental Feed Device

IP.com Disclosure Number: IPCOM000091751D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Related People

Litkenhus, JR: AUTHOR [+5]

Abstract

Member 10 is displaced downwardly along operating line 11 under the control of rotatable leadscrew 12. The latter is normally held stationary by pawl 13 against rotative motion delivered through friction clutch 14 by shaft 15 that rotates continuously in the direction of the arrow. Member 10 is continuously urged downwardly by cord 16 and a yielding power source such as a spiral spring not shown. Member 10 is operatively connected to leadscrew 12 by dog 17.

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Varied Incremental Feed Device

Member 10 is displaced downwardly along operating line 11 under the control of rotatable leadscrew 12. The latter is normally held stationary by pawl 13 against rotative motion delivered through friction clutch 14 by shaft 15 that rotates continuously in the direction of the arrow. Member 10 is continuously urged downwardly by cord 16 and a yielding power source such as a spiral spring not shown. Member 10 is operatively connected to leadscrew 12 by dog
17.

When it is desired to advance member 10 downwardly, suitable data is presented to counter 18 and shaft 19 is caused to rotate through a single revolution. Shaft 19 drives cam 20 to lift arm 21 and pivot bellcrank 22 counterclockwise, driving pawl 13 from ratchet
23. Weak electromagnet 13a is energized to hold pawl 13 in its retracted position. Screw 12 begins to rotate under influence of shaft 15 and member 10 moves downwardly under influence of spring 16. Positional feedback wheel 24 rotates with leadscrew 12 and is provided with first and second tracks 25 and 26 of transparent openings aligned with a respective pair of light bulbs 27. Rotation of wheel 24 thus causes a plurality of light pulses to be applied to transducer 28. The latter, in turn, delivers electrical pulses indicative of such angular motion to counter 18. When transducer 28 delivers a number of pulses to counter 18 equal to the desired movement of member 10, electromagnet 13a is de-energized, permitting pawl 13 to re-enter ratchet 23 through the influence of spring 30.

The incremental control of member 10 can be changed by substitution of ratchet 31 for ratchet 23 and by observing optical track 26 instead of track 25. The latter operation is...