Armature of an electromagnet-coil/armature system for dot matrix

Details Armature of an electromagnet-coil/armature system for dot matrix Armature of an electromagnet-coil/armature system for dot matrix

1989-04-21

1991-12-24

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

050746871

ABSTRACT:
In a method for the manufacture of armatures from sheet-metal parts stacked in the manner of laminated inductors, predeterminately shaped openings or indentations (6) and corresponding coaxially opposite projections (8) are defined in and during the formation of the sheet-metal parts (1, 2, 3), the sheet-metal parts are stacked so that the projections (8) nestedly engage the shaped openings or indentations (6) of the adjacent sheet-metal part (1, 2, 3) and thereby provide form-locked mechanical connections between the parts, and the stack (11) of sheet-metal shapes is secured against loosening and disengagement of the form-locked mechanical connections (10) by cementing or thermal bonding or the like of the sheet-metal parts one to another.

REFERENCES:
patent: 3202851 (1965-08-01), Zimmerle et al.
patent: 4264663 (1981-04-01), Beenken
patent: 4538345 (1985-09-01), Diedericks
patent: 4674897 (1987-06-01), West et al.
patent: 4881832 (1989-11-01), Mitsuishi et al.

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