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Print or Punch Actuator

IP.com Disclosure Number: IPCOM000095800D
Original Publication Date: 1964-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Colligan, JJ: AUTHOR [+2]

Abstract

In this actuator, a fluid pressure pulse is used to develop a force sufficient to neutralize or offset a magnetic holding force.

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Print or Punch Actuator

In this actuator, a fluid pressure pulse is used to develop a force sufficient to neutralize or offset a magnetic holding force.

A print hammer 1 (or punch) rockably supported at 2 has a portion 3 of soft magnetic material normally attracted to permanent magnet 4. Rotating cam 5 periodically carries operating spring finger 6 into contact with the end of arm 7 of the hammer and exerts a mechanical force on it. This force is normally insufficient by itself to free the hammer from the attractive force of the magnet. However, to print (or punch) a character, fluid pulses supplied at the proper time via one or more, openings 8 assist the mechanical force sufficiently to overcome the magnetic holding force and separate 3 from 4.

Since the magnetic force decreases as the gap between 3 and 4 increases, the pulse need be only momentary. As soon as 3 is freed from 4, finger 6 drives 1 a substantial distance before wiping past the tip of 7. Then 1 continues to the operated position against the force of return spring 9, and then is returned into contact with 4 by rebound energy plus that of spring 9.

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