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Electromagnetically Operated Print Hammer Assembly

IP.com Disclosure Number: IPCOM000051554D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 74K

Publishing Venue

IBM

Related People

Lee, HC: AUTHOR

Abstract

As seen in Fig. 1, an electromagnetically operated print hammer assemb comprises magnetic stator block 10 and non-magnetic comb bar 11 attached to steel mounting bar 12. Slot 13 in comb bar extension 14 receives pivot pin 15 of magnetic hammer element 16. Extensions 17 from the upper section of the comb bar 11 provide guides for hammer element 16 at its upper extremity. A permanent magnet bar 19 mounted on comb bar 11 provides a restore force to hammer element 16 which includes an impact face 18.

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Electromagnetically Operated Print Hammer Assembly

As seen in Fig. 1, an electromagnetically operated print hammer assemb comprises magnetic stator block 10 and non-magnetic comb bar 11 attached to steel mounting bar 12. Slot 13 in comb bar extension 14 receives pivot pin 15 of magnetic hammer element 16. Extensions 17 from the upper section of the comb bar 11 provide guides for hammer element 16 at its upper extremity. A permanent magnet bar 19 mounted on comb bar 11 provides a restore force to hammer element 16 which includes an impact face 18.

Fig. 2 shows one embodiment of the stator block 10 in which a plurality of stators 20 for each of a plurality of hammers are fashioned from a single block of magnetic material, such as low carbon steel (1008). Individual plate-like stators 20 are formed in a single sawing operation using gang saws. When fabrication is complete, the stators 20 are solidly joined by section 21 having dimensions which will afford rigidity with a minimum of flux interaction. In this manner a stator block structure is provided which gives close tolerance control and simplifies the making of the total assembly.

Fig. 3 shows a second embodiment of a stator block construction in which the upper legs 22 of the stator plates have pivot slots 23.

This eliminates the separate comb bar extensions 14, making an even more compact design.

Figs. 4 and 5 show an additional embodiment in which the comb bar 11 is a single aluminum block with slots 25. Indiv...