Printer

Details Printer Printer

1976-10-27

1978-08-29

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

B41J 938

Patent

active

RE0297453

ABSTRACT:
A printer has a plurality of print hammers displaceable between a rest position and a print position, and respective deformable elastic bodies maintained in a deformed position by each print hammer in its rest position and biasing the print hammer toward its print position. Respective magnetic circuit control means are selectively operable to hold each print hammer in its rest position and to release the print hammer for displacement to the print position by the respective elastic body. Each magnetic circuit control means includes a permanent magnet, a first hammer-hold magnetic circuit including a portion of the respective hammer and a second release magnetic circuit including a release coil operable to release the print hammer from its rest position responsive to a print command signal thereto in a direction to increase the magneto-motive force in the second magnetic circuit with a corresponding decrease in the magneto-motive force in the first magnetic circuit to release the respective print hammer for movement to its print position by the associated elastic body. The second magnetic circuit has a magnetic reluctance greater than that of the first magnetic circuit. The first and second magnetic circuits are connected in parallel with the permanent magnet. In one embodiment of the invention, the greater magnetic reluctance is provided by an adjustable air gap in the second magnetic circuit. In another embodiment of the invention, the two magnetic circuits are connected in parallel with the permanent magnet through a common air gap having a reluctance greater than that of the print hammer portion in the first magnetic circuit.

REFERENCES:
patent: 3049990 (1962-08-01), Brown et al.
patent: 3279362 (1966-10-01), Helms
patent: 3351006 (1967-11-01), Belson
patent: 3355659 (1967-08-01), Schacht et al.
patent: 3416442 (1968-12-01), Brown et al.
patent: 3459126 (1969-08-01), Nyman
patent: 3707122 (1972-12-01), Cargill

Affiliated with

Also associated with

Rating

Printer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Printer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1624383