Printing – Selective or progressive – Bed and platen machines
Patent
1979-02-02
1981-08-18
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
335229, B41J 128
Patent
active
042840023
ABSTRACT:
In a character-selecting mechanism for a printer, an electromagnet which controls the engagement and disengagement of a pawl with a ratchet and, thereby, the actual printing step, is supplemented with a permanent magnet having spaced-apart poles. A core arm lies within a core passage in the electromagnet and protrudes into the magnetic field produced by the permanent magnet. Activation of the electromagnet by a current pulse magnetizes the core arm to a polarity such that it is repelled by a pole next to which the core arm is disposed in a first position so that the core arm moves toward the other pole to take up a second position. During the transit from first to second position the core arm which is connected through a core member to a pawl brings the pawl into engagement with the ratchet. The energy requirement for effecting engagement of the pawl with the ratchet is substantially smaller than that of mechanisms relying on an electromagnet alone, whereby reducing both the size and the power consumption of such a printer.
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patent: 3952853 (1976-04-01), Feldman
patent: 3954055 (1976-05-01), Henaoka
Mitsui Yoshihiro
Shimodaira Tadayoshi
Coven Edward M.
Kabushiki Kaisha Suwa Seikosha
Shinsu Seiki Kabushiki Kaisha
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