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Browse Prior Art Database

Magnet Arrangement for Play Reduction

IP.com Disclosure Number: IPCOM000061233D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Bohg, A: AUTHOR

Abstract

A permanent magnet is arranged adjacent to moving components of steel, causing them to be unilaterally pulled towards their bearings and reducing the play between components and bearings. In printers, this permits limiting flight time variations to a minimum, thus improving the print quality. IBM Technical Disclosure Bulletin 25, 7A, 3201-3202 (December 1982), describes the ball bearing of an axially movable shaft. The bearing race is forced by a spring against the shaft, reducing the bearing play. The figure shows an embodiment providing for the play between a print hammer and its actuator to be reduced by means of a permanent magnet. Print hammer 1 of steel is supported in hammer guide 2 such that it is capable of being moved in an axial direction (in the illustrated embodiment to the right) against the paper to be printed.

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Magnet Arrangement for Play Reduction

A permanent magnet is arranged adjacent to moving components of steel, causing them to be unilaterally pulled towards their bearings and reducing the play between components and bearings. In printers, this permits limiting flight time variations to a minimum, thus improving the print quality. IBM Technical Disclosure Bulletin 25, 7A, 3201-3202 (December 1982), describes the ball bearing of an axially movable shaft. The bearing race is forced by a spring against the shaft, reducing the bearing play. The figure shows an embodiment providing for the play between a print hammer and its actuator to be reduced by means of a permanent magnet. Print hammer 1 of steel is supported in hammer guide 2 such that it is capable of being moved in an axial direction (in the illustrated embodiment to the right) against the paper to be printed. The end of hammer shaft 3 is provided with a plate 4 interacting with a spiral spring 5 such that the print hammer, after having been fired by spiral spring 5, is returned to its rest position. Print hammer 1 is actuated by push rod 6 which is axially movable in push rod guide 7 and provided with a push rod cap 8 at its front end. Push rod 6 is actuated by an electromagnet (not shown). Permanent magnet 9, comprising two soft-iron focussing plates 10 and 11, is positioned in the contact region of print hammer 1 and push rod 6 radially staggered thereto. Magnet 9 exerts radial forces on print hammer 1 and...