Typewriting machines – Including type-set-assemblage mounted on carrier and... – Including type-faces movable relative to type-face-carrier
Patent
1987-03-09
1987-12-22
Sewell, Paul T.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Including type-faces movable relative to type-face-carrier
318696, 400322, 4001545, B41J 130, B41J 796
Patent
active
047143614
ABSTRACT:
A method or system for bringing a movable element of a stepper motor to its home position by mechanically blocking the movable element from further moving from the home position, wherein the movable element is moved in one direction by repeating an energization cycle in which windings for sequentially establishing different energization phases are energized in a predetermined sequence at a predetermined interval from one phase to another. After the movable element is mechanically blocked, a motor driver circuit energizes at least one of the windings which corresponds to at least one of the energization phases that precedes another of the energization phases which corresponds to the home position of the movable element. This energization of the winding or windings for each preceding phase continues for a time longer than the predetermined energization interval of the normal energization cycle. Then, the phase corresponding to the home position of the movable element is maintained to hold the motor stopped at the predetermined home position.
REFERENCES:
patent: 4024447 (1977-03-01), Epstein
patent: 4264220 (1981-04-01), Okcuoglu
patent: 4279523 (1981-07-01), Ringle
patent: 4362980 (1982-12-01), Itzkowitz
patent: 4504158 (1985-03-01), Ciampi
patent: 4605324 (1986-08-01), Musso
patent: 4622505 (1986-11-01), Okabayashi
patent: 4669900 (1987-06-01), Miyake
Yamakawa Kiyoshi
Yoshimoto Satoshi
Brother Kogyo Kabushiki Kaisha
Sewell Paul T.
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