Acoustical tone generator

Details Acoustical tone generator Acoustical tone generator

1980-06-02

1982-02-09

Sewell, Paul T.

Typewriting machines

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

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

400344, 4007053, 400712, B41J 130, B41J 2946

Patent

active

043147690

ABSTRACT:
In an impact typewriter/printer using a daisy wheel typefont a stepper motor for rotating said daisy wheel for character selection purposes and microprocessor facilities for controlling said stepper motor, means are provided for generating tones signalling the occurrence of predetermined events to be brought to the attention of the typist. For that purpose, the microprocessor facilities are used to detect and identify the occurring event and then generate a tone of a predetermined frequency by moving said stepper motor back and forth at given rates whereby the daisy wheel typefont is made to vibrate the surrounding air fluid and generate the acoustical tone.

REFERENCES:
patent: 4178108 (1979-12-01), Kane
IBM Tech. Disc. Bulletin, vol. 20, No. 5, Oct. 1977, p. 1890, by J. L. Regehr et al.
IBM Tech. Disc. Bulletin, vol. 22, No. 8A, Jan. 1980, p. 3052, by G. P. Olson.
Machine Design, Apr. 26, 1979, pp. 213-217, "Software for Stepping Motors", by B. C. Lafreniere.

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