Wire-dot print head driving apparatus having sensing coils

Details Wire-dot print head driving apparatus having sensing coils Wire-dot print head driving apparatus having sensing coils

1989-10-26

1991-12-10

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001573, 400166, B41J 944

Patent

active

050712683

ABSTRACT:
In a driving apparatus for a wire-dot print head having electromagnets for driving print wires, each electromagnet comprising a core and a coil, sensing coils are provided in association with the respective electromagnets and provided to interlink the magnetic flux passing through the core of the associated electromagnet, a magnetic flux detecting circuit is connected to the sensing coils for detecting the magnetic flux passing through the core, and a control and drive circuit is responsive to the detected magnetic flux for deciding the termination of the energization of the drive coil.

REFERENCES:
patent: 4273039 (1981-06-01), Luo et al.
patent: 4293888 (1981-10-01), McCarty
patent: 4396304 (1983-08-01), Daueport et al.
patent: 4433927 (1984-02-01), Cauallari
patent: 4735517 (1988-04-01), Knox, Jr. et al.
patent: 4812062 (1989-03-01), Ishinaga
patent: 4950092 (1990-08-01), Kikuchi et al.

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