IMPROVED ACOUSTICAL TONE GENERATOR AND PRINTING SYSTEM USING SAID GENERATOR

In an impact typewriter/printer using a daisy wheel typefont (19) a stepper motor (23) for rotating said daisy wheel for character selection purposes and microprocessor (51,53, 55) facilities for controlling said stepper motor, means are provided for generating tones signalling the occurrence of pre...

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Bibliographische Detailangaben
1. Verfasser:	JAMES, EDMUND HULIN, III
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PERFORMING OPERATIONS PHYSICS PRINTING SELECTIVE PRINTING MECHANISMS SOUND-PRODUCING DEVICES STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	In an impact typewriter/printer using a daisy wheel typefont (19) a stepper motor (23) for rotating said daisy wheel for character selection purposes and microprocessor (51,53, 55) 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.