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Browse Prior Art Database

Adjustment Means for Stored Energy Print Hammers

IP.com Disclosure Number: IPCOM000045053D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR [+2]

Abstract

A print hammer assembly has plural flexure hammer elements attached to a common torsion plate which is part of an adjustment mechanism designed to allow the torque of the flexure elements to be individually adjusted whereby the flight time and striking force of the hammer elements can be controlled.

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Adjustment Means for Stored Energy Print Hammers

A print hammer assembly has plural flexure hammer elements attached to a common torsion plate which is part of an adjustment mechanism designed to allow the torque of the flexure elements to be individually adjusted whereby the flight time and striking force of the hammer elements can be controlled.

The print hammer assembly 10 (Fig. 1) comprises a magnetic core block 11 with permanent magnets 12 which retract and hold flexure elements 13 in spring- loaded condition. Electric windings (not shown) on a stator 28 (Fig. 2) are selectably energized to release the hammer elements 13, causing horizontal hammer blade 14 to strike one or more moving impression members 15 for printing characters on a print medium 16 supported by a platen 17. The torsion plate 18 is fabricated by stamping or cutting a flat piece of flexible steel to form coplanar flexure hinge parts 19 and 20 (Fig. 4). Screws 21 anchor hinge parts 29 to core block 11. Screws or rivets 22 attach base 23 of hammer elements 13 to hinge parts 20. Resilient wings 24, formed on the end of base portion 23 of hammer elements 13, are compressed between the bottom surface of core block 11 and hinge part 20 (Fig. 3). Adjustment screws 25 extend through openings 26 in hinge parts 20 into threaded opening 27 in core block 11. Rotation of the adjustment screw 25 alters the separation of hinge parts 20 from core block 11, imparting arcuate motion to hammer element 13 to co...