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Ultra Wide Multiple Print Position Hammer Element

IP.com Disclosure Number: IPCOM000050095D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

A single piece flexible hammer element 10 (Fig. 1) for multiple print positions is provided with a double bend flexure 11 between a fixed horizontal base 12 and a deflectable vertical stem 13 which terminates in a horizontal bar extension 14. The double bend flexure 11 has no vertical component of motion, thereby minimizing the wear when stem 13 is deflected to its retracted position to strike the stator post 16 by the attraction of holding magnet 24.

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Ultra Wide Multiple Print Position Hammer Element

A single piece flexible hammer element 10 (Fig. 1) for multiple print positions is provided with a double bend flexure 11 between a fixed horizontal base 12 and a deflectable vertical stem 13 which terminates in a horizontal bar extension 14. The double bend flexure 11 has no vertical component of motion, thereby minimizing the wear when stem 13 is deflected to its retracted position to strike the stator post 16 by the attraction of holding magnet 24.

The flexible hammer element 10 is constructed from a piece of sheet steel having a uniform thickness. Apertures 18, 19 and 20, shown in Figs. 2 and 3, are cut out prior to bending. Attachment holes 21 are drilled in base 12 to receive bolts 22 for attachment to block 15. The bottom of magnet 24 is also bonded to the upper portion of block 15. The dual bends of flexure 11 and the formation of the horizontal bar extension 14 can be produced using progressive die tooling. Coil 17, when energized, counteracts the holding force of permanent magnet 24 attached to magnetic block 15, releasing the hammer element 10 to spring forward to cause impact along edge 27 of bar extension 14.

When released, stem 13 pivots with its bias around effective pivot point 25 in the double-bend flexure 11, which pivot point itself is movable, thereby compensating for the vertical component of motion. Upon retraction of stem 13 from its forwardmost position by deenergizing coil 17 and allowing...