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Browse Prior Art Database

Focusing Plate for a Magnetic Actuator

IP.com Disclosure Number: IPCOM000053081D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

A resilient magnetic hammer beam is held in retracted spring loaded condition against center pole piece 11 by the magnetic attraction force produced by strip permanent magnets 12 and 13 which are mounted on the top of pole pieces 14 and 15, respectively, of magnetic core 16. Impact blade 17 is attached to beam 10 in alignment with center pole piece 11. Magnetic focusing plate 18 on magnet 12 has a comb-like structure including focusing plate sections 19 separated by air gaps 20. Each of the focusing plate sections 19 has focusing fingers 21 and 22 extending beyond the inner edge of permanent magnet 12 to form U-shaped notch 23 which receives tab section 24 of beam 10. Notch 23 is dimensioned so that a more or less uniform gap 25 exists between the end and side edges of tab section 24.

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Focusing Plate for a Magnetic Actuator

A resilient magnetic hammer beam is held in retracted spring loaded condition against center pole piece 11 by the magnetic attraction force produced by strip permanent magnets 12 and 13 which are mounted on the top of pole pieces 14 and 15, respectively, of magnetic core 16. Impact blade 17 is attached to beam 10 in alignment with center pole piece 11. Magnetic focusing plate 18 on magnet 12 has a comb-like structure including focusing plate sections 19 separated by air gaps 20. Each of the focusing plate sections 19 has focusing fingers 21 and 22 extending beyond the inner edge of permanent magnet 12 to form U-shaped notch 23 which receives tab section 24 of beam 10. Notch 23 is dimensioned so that a more or less uniform gap 25 exists between the end and side edges of tab section 24.

In its retracted and spring-loaded condition, tab section 24 of beam 10 is entirely within notch 23. In its extended stroke position (as shown in Fig. 2), that is, when coil 26 is energized to buck out flux from permanent magnets 12 and 13 in center pole piece 11, the bottom surface of tab section 24 of beam 10 can be just above the top surface of focusing fingers 21 and 22. At this point a near maximum recapture force will be provided to flex beam 10 and tab section 24 to engage center pole 11 when current is removed from coil 26. This arrangement provides high velocity retraction of the beam 10.

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