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Print Hammer Having Improved Magnetic Flux Means

IP.com Disclosure Number: IPCOM000112494D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+2]

Abstract

A stored energy dot band print hammer is described which utilizes a passive magnetic flux path incorporated within a dot band guiding structure which results in significantly increased total print energy and operating speed without any change in the mass of the armature or hammer.

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Print Hammer Having Improved Magnetic Flux Means

      A stored energy dot band print hammer is described which
utilizes a passive magnetic flux path incorporated within a dot band
guiding structure which results in significantly increased total
print energy and operating speed without any change in the mass of
the armature or hammer.

      The print hammer assembly shown in Figs. 1 and 2, utilizes
magnetically permeable material such as 1010 steel to provide a
passive magnetic flux path by the use of magnetically permeable
element (2) which also supports a low friction and wear band guiding
elements (9).

      An opening (12) in the print hammer assembly is formed between
the upper and lower band guides (9) whereby portions of the print
bands dot producing elements (not shown) pass through to be acted on
by hammer faces (11).

      Magnetically permeable element (2) which is coextensive with
permanent magnet (5) and stator pole face (6) usefully directs part
of the magnetic flux produced by permanent magnets (5) toward an
extended portion (7) of magnetically permeable element (2).  Upper
and lower magnetically permeable elements (2) may also coextend
laterally to overlap multiple interleaved upper and lower print
hammers (4).  This extended portion (7) of magnetically permeable
element (2) provides a path for additional magnetic flux into the
over hanging region of print armature portion (3) of print hammer (4)
which passes through print armature 3 and...