Head drive mechanism

Details Head drive mechanism Head drive mechanism

1999-09-09

2000-12-12

Hilten, John S.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400332, B41J 1930

Patent

active

06158908&

ABSTRACT:
A head drive mechanism capable of improving color shading in an exposed image due to a variation or nonuniformity in speed of a photosensitive head corresponding to pitches of teeth of a toothed belt. The photosensitive head includes a dot block which is constituted by a luminous dot group constituted of a line of a row A formed of even luminous dots and a line of a row B formed of odd luminous dots. Also, the rows A and B are so arranged that the luminous dots of the row A and those of the row B are offset from each other with an interval Ds being defined therebetween. A final transmission system is constituted of a toothed drive pulley, a toothed driven pulley and a toothed belt. The toothed belt is constructed so as to have tooth pitches Q=2Ds/(2n+1) reduced in terms of a relative travel distance of the head, wherein n is 0 or a positive integer.

REFERENCES:
patent: 4784503 (1988-11-01), Bettini
patent: 5465110 (1995-11-01), Carlotta et al.
patent: 5832820 (1998-11-01), Barrus

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