Print head with tapered conical return spring

Details Print head with tapered conical return spring Print head with tapered conical return spring

1990-03-15

1991-08-13

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9334, B41J 2275

Patent

active

050392360

ABSTRACT:
A dot matrix print head has a print wire unit having a plurality of print wires, an armature unit having a plurality of armatures, each corresponding to the print wire, and an electromagnet unit having electromagnets. Each wire comprises a wire body and a head. A return coil spring is provided between the head of the print wire and a guide plate. The return coil spring has a small diameter end portion engaged with the head and a large diameter portion engaged with the guide plate and has a substantially conical peripheral shape. The large diameter portion engages a recess, thereby preventing rotation of the spring.

REFERENCES:
patent: 4014425 (1977-03-01), Gijzen et al.
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4018155 (1977-04-01), Cargill
patent: 4437775 (1984-03-01), Ochiai et al.
patent: 4708501 (1987-11-01), Takemoto
patent: 4728205 (1988-03-01), Hasumi et al.
patent: 4852481 (1989-08-01), Kobrya et al.

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