Automatic gap adjustment apparatus for printing head

Details Automatic gap adjustment apparatus for printing head Automatic gap adjustment apparatus for printing head

1990-03-08

1991-12-24

Wiecking, David A.

Typewriting machines

Including adjustment for optimum printing plane

By adjustment of carriage

400124, B41J 25308

Patent

active

050746863

ABSTRACT:
Apparatus for automatically adjusting the distance of a printing head from a printing support wherein motor means enable changing, on command, the print head distance from the support and a movable armature/plunger electromagnetic detector, fixed to the printing head is energized, when the print head is moved far from the printing support, so as to perform the cocking of the armature/plunger and is thereafter maintained in energized status by a minimal current for holding the electromagnet in cocked state, so that a subsequent movement of the print head towards the printing support, owing to the interference with the printing support of an actuation element coupled to the armature/plunger, causes armature/plunger release and a reluctance change, hence an e.m.f. induced in the energization winding which is detected by a comparator circuit and signaled to a control logic to indicate that the print head is at a predetermined distance from the printing support. If the print head is provided with electromagnetic printing actuators, the detection function may be performed by one or more actuation elements.

REFERENCES:
patent: 4174908 (1979-11-01), Wehler
patent: 4300846 (1981-11-01), Rose
patent: 4333398 (1982-06-01), Carson
patent: 4407193 (1983-10-01), Hall
patent: 4548066 (1985-10-01), Martinez
patent: 4676675 (1987-06-01), Suzuki
patent: 4907901 (1990-03-01), Mitchell

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