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Electromagnetically Driven Impact Print Unit with Flexible Pivots

IP.com Disclosure Number: IPCOM000050444D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Habich, AB: AUTHOR

Abstract

The present structure provides a novel plastic hinge with damping ability to provide a flexible pivot for an electromagnetically activated lever arm. This structure has a particular application in impact printers, and specifically in wire matrix printheads wherein each of the wires in a multiwire head, e.g., a 16-wire head, has associated therewith an electromagnetic lever arm assembly containing the present flexible pivot structure.

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Electromagnetically Driven Impact Print Unit with Flexible Pivots

The present structure provides a novel plastic hinge with damping ability to provide a flexible pivot for an electromagnetically activated lever arm. This structure has a particular application in impact printers, and specifically in wire matrix printheads wherein each of the wires in a multiwire head, e.g., a 16-wire head, has associated therewith an electromagnetic lever arm assembly containing the present flexible pivot structure.

With reference to Fig. 1, the flexible hinge 4 is the key to the present apparatus. It is made of a plastic or flexible elastomer serving as a pivot for a lever arm 7 about the electromagnet yoke 2. The structure eliminates shafts, bearings or the mechanical pivoting means. It requires no extreme tolerances and avoids the need for an inefficient air gap at the hinge end of the armature yoke interface. Armature 1 is maintained in close proximity to the electromagnet yoke 2 supporting coil 3. The hinge assembly 4 comprises a flexible encasement which has a thin section 5 serving as a hinge or pivot.

An alternative variation of this structure is shown in Fig. 2. The structures of Figs. 1 and 2 will have different ratios of travel between the end 6 on the lever arm 7, which drives against the wire in the wire matrix, and the width of the air gap 8 in the electromagnetic assembly. In both structures, the length of lever arm 7 is equal to the length of armature 1. In the str...