Positioning device for a selection member of printing machines

Details Positioning device for a selection member of printing machines Positioning device for a selection member of printing machines

1982-12-29

1985-03-12

Sewell, Paul T.

Typewriting machines

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

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

310 83, 310114, 318593, 318653, 400320, 400322, B41J 130, H02K 706, G05B 1118

Patent

active

045041580

ABSTRACT:
Positioning device for a printer comprising a type carrier daisy wheel fitted on a carriage movable in front of the platen. The selection of type and movement of carriage are carried out by selection and transport motors of direct current type which are controlled by velocity servo motors through corresponding digital transducer and position counters. After a coarse positioning by the servo motor, the exact final position is reached and kept by exciting a couple of magnetic positioners whose rotor is keyed on the axes of the selection and transport motors.
Economic solutions are also described to synchronize, during initialization of the machine, the content of the position counters with the effective positions of the daisy wheel and carriage.

REFERENCES:
patent: 3651916 (1972-03-01), Becchi
patent: 3701104 (1972-10-01), Wiseman
patent: 4264220 (1981-04-01), Okcuoglu
patent: 4293233 (1981-10-01), Hoffman
patent: 4349770 (1982-09-01), Ragen
patent: 4390293 (1983-06-01), Gubau et al.
patent: 4440512 (1984-04-01), Forcier

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