Dot print head with restrained rebound of armature

Details Dot print head with restrained rebound of armature Dot print head with restrained rebound of armature

1987-05-26

1988-10-18

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

047782927

ABSTRACT:
A dot print head includes a spring plate having a plurality of integral tongues arranged successively along one longitudinal side edge thereof, a plurality of armatures each fixedly attached at a part at least excluding the rear end thereof to the upper surface of a respective tongue of the spring plate with the rear end of each armature located on the side of the fixed longitudinal side portion of the spring plate with respect to the fixed point of primary vibration thereof caused by the tongue of the spring plate, and a plurality of styluses each fixed to the free end of a respective armature. A yoke member is fixedly attached to the upper surface of the fixed longitudinal side portion of the spring plate and has a plurality of recesses for loosely receiving the armatures therein, to exert the effect of a magnetic field on the corresponding armatures. A restrictor is located on the respective path of the respective rear end of each armature to limit the movement of the respective rear end of the armature. A driver drives the armatures and a guide guides the styluses. A fastener fastens the spring plate, the yoke, the restrictor, the driver and the guide to a base plate.

REFERENCES:
patent: 4230038 (1980-10-01), Hebert
patent: 4252449 (1981-02-01), Miyazawa
patent: 4611393 (1986-09-01), Norigoe

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