Browse Prior Art Database

Impact Printer

IP.com Disclosure Number: IPCOM000085532D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 86K

Publishing Venue

IBM

Related People

Corfits, WD: AUTHOR [+3]

Abstract

This printer is low-cost unitized and easily assembled. The printer is of the type disclosed in U. S. Patent 3,811,377 and includes a pair of print hammer assemblies disposed above a print wheel, these elements being similar to the hammer assemblies 10 and 11 and print wheel of U. S. Patent 3,811,377.

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Impact Printer

This printer is low-cost unitized and easily assembled. The printer is of the type disclosed in U. S. Patent 3,811,377 and includes a pair of print hammer assemblies disposed above a print wheel, these elements being similar to the hammer assemblies 10 and 11 and print wheel of U. S. Patent 3,811,377.

One of the hammer assemblies is shown in Fig. 1 and includes metal leaf springs 3 and 3a which are molded into plastic hammers 2. Springs 3 are all joined together at their bases as are springs 3a; and the bases of springs 3 and 3a are molded into body 1, as body 1 is molded using a suitable mold. E-shaped cores 4 are also molded into body 1 at the same time.

Into the molded assembly including body 1, springs 3 and 3a and hammers 2 are inserted several components: An elastomer armature pivot and retaining member 6 is inserted into suitable slots la on upper edges of body 1 and is held in place by magnet shields 7. Shields 7 are in turn held in place by twist tabs 8 provided at the bottom of shields 7. Selfretaining snap-in coils 9 using hooks 9a for retention are installed as a part of cable assembly 30 that is routed through an area provided in body 1, and is held in place with a snap-in cable retainer 31 to hold cable leads in place.

Cantilevered armatures 12 are inserted under the elastomer retaining member 6, and a snap-on dust shield 13 is installed on body 1 to prevent foreign material from accumulating in the armature pivot area. The flight time of hammers 2 is adjusted by an adjustment bar 15 that has individual adjustable up- stop screws 32 locked in position in bar 15. Bar 15 overlies hammers 2 in the same manner as bar 54 of U. S. Patent 3,811,377 overlies the hammers 20 of the impact printer of this patent.

Body 1 is provided with a bottom opening 1b therein so that air may freely circulate upwardly around coils 9 and out of body 1 to cool coils 9. Parts of body 1 are cut away at 34 to provide communication with slots 1a for retaining member
6. The cutouts 34 allow any foreign material.that t...