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Print Hammer Adjustment Means

IP.com Disclosure Number: IPCOM000053083D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

The adjustment means of this article is designed to adjust the spring force of a resilient hammer beam relative to the retraction and holding forces of the permanent magnets of the actuator mechanism.

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Print Hammer Adjustment Means

The adjustment means of this article is designed to adjust the spring force of a resilient hammer beam relative to the retraction and holding forces of the permanent magnets of the actuator mechanism.

Resilient hammer beams 10 are fixedly attached between flexible slotted clamping plates 11 and 12 to mounting block 13 by clamping screws 14. The deflection ends of beams 10 are retracted from a print position and held in non- print position by virtue of magnetic field forces from strip permanent magnets 15 and 16, which are mounted on pole pieces 17 and 18. A focusing plate 19 of magnetically permeable material concentrates magnetic flux from permanent magnet 16 to bring the end of beams 10 near magnetic saturation. Center pole pieces 20 fix the limit of retracted deflection of beams 10, maintain air gaps between beam 10 and magnets 15 and 16, and provide a common return path for flux from permanent magnets 15 and 16. A coil 21, when energized, opposes flux in center pole piece 20 to release the beam 10, causing blade 22 to impact a print medium and/or impression-forming members.

Adjusting screws 23 are provided in threaded openings 24 of block 13 beneath clamping plate 12. Adjustment screws 23 adjust the deflection of beams 10, clamping plates 11 and 12 upwardly or downwardly depending on the direction of rotation. This in turn causes the entire beams 10 to be deflected upward or downward, that is toward or away from the surface of ce...