Rotary character-carrying member and selector device therefor fo

Details Rotary character-carrying member and selector device therefor fo Rotary character-carrying member and selector device therefor fo

1986-04-30

1988-10-18

Pearson, Charles A.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

400175, B41J 130

Patent

active

047782897

ABSTRACT:
A print unit for an electronic typewriter comprising a removable character-carrying disc with flexible spokes which is operated by a selector motor which in turn is controlled by a control circuit. The character-carrying disc is provided with a plurality of reflective identification plates and a recognition circuit detects the pattern of the reflective plates present in selected ones of a series of predetermined angular sectors of the disc to identify some characteristics of the disc, e.g. typing pitch and character set. The angular position of the disc is detected by a position transducer which generates a position signal for the control circuit having a period which is double the angular distance between two contiguous character-carrying spokes discriminating the spokes at even positions from those at odd positions. In an initialization phase, a zeroing circuit coarsely positions the character-carrying disc in a zero area defined by a synchronization plate adjacent a plate-free gap and activates the control circuit to stop the character-carrying disc in a zero position in respect of a spoke having a predetermined parity. The print unit is provided with phase regulation elements for the position transducer and for the circuit for recognition of the reflective plates on the character-carrying disc.

REFERENCES:
patent: 4281938 (1981-08-01), Phillips
patent: 4338035 (1982-07-01), Kondo et al.
patent: 4553868 (1985-11-01), Crosio
patent: 4605324 (1986-08-01), Musso

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