US3842734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printer
Assignee: Suwa Seikosha KK
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Filing: 1972-12-29
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Granted: 1974-10-22
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Expires: 1992-12-29
Abstract
Abstract A printer is provided with a plurality of print hammers, each of which is maintained in a rest position engaging a deformed elastic body. A magnetic circuit is provided for selectively maintaining each of said print hammers in said rest position and for selectively releasing said print hammer to effect printing. The magnetic circuit consists of a first portion including a portion of said print hammer and a second portion including a release coil, the first and second portions being connected in parallel with a permanent magnet so that said print hammer is released from its rest position by exciting the release coil in a direction such that the magnetomotive force applied to said print hammer to hold said print hammer in position is decreased, the displacement of the print hammer being the product of the release of the energy of the elastic body.
Inventors
- 👤 Y Gomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:29
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
212 words
In a printer having a plurality of print columns, each column having print hammers displaceable between a rest and a print position; a deformable elastic body maintained in a deformed condition by the associated print hammer at said rest position; improved magnetic circuit control means for selectively holding the associated hammer at a rest position and releasing same for displacement to a print position including a permanent magnet common to at least two of said columns, a first hammer-hold magnetic circuit portion including a portion of the associated print hammer, and a second magnetic circuit pOrtion associated with each print hammer including release coil means, said first and second magnetic circuit portions being connected in parallel to each other, said parallel connection being connected to said permanent magnet for receiving magnetic flux therefrom, each of said magnetic circuit control means being adapted to hold the associated hammer at said rest position and to release said associated hammer upon the application of a signal to the associated release coil means in a direction so as to decrease the magnetomotive force applied to the associated hammer, the energy stored in the associated deformed elastic body displacing the associated hammer from said rest position to said print position upon said decrease in said magnetomotive force.
Claim 2
Dependent Claim
212 words
In a printer having a plurality of print columns, each column having print hammers displaceable between a rest and a print position; a deformable elastic body maintained in a deformed condition by the associated print hammer at said rest position; improved magnetic circuit control means for selectively holding the associated hammer at a rest position and releasing same for displacement to a print position including a permanent magnet common to at least two of said columns, a first hammer-hold magnetic circuit portion including a portion of the associated print hammer, and a second magnetic circuit pOrtion associated with each print hammer including release coil means, said first and second magnetic circuit portions being connected in parallel to each other, said parallel connection being connected to said permanent magnet for receiving magnetic flux therefrom, each of said magnetic circuit control means being adapted to hold the associated hammer at said rest position and to release said associated hammer upon the application of a signal to the associated release coil means in a direction so as to decrease the magnetomotive force applied to the associated hammer, the energy stored in the associated deformed elastic body displacing the associated hammer from said rest position to said print position upon said decrease in said magnetomotive force.
Claim 3
Dependent Claim
39 words
A printer as recited in claim 1, wherein each said magnetic circuit control means includes a magnetic saturation region, said first and second magnetic circuit portions being connected in parallel through said magnetic saturation region with said permanent magnet.
Claim 4
Dependent Claim
46 words
A printer as recited in claim 2, wherein each said first magnetic circuit portion includes yokes associted with a respective print hammer and having a pair of attractive faces, each said hammer including portions positioned for associated engagement against the attractive faces at said rest position.
Claim 5
Dependent Claim
35 words
A printer as recited in claim 2, each hammer having a respective stopper means positioned in the path of a portion of said hammer for stopping the displacement of said hammer at said print position.
Claim 6
Dependent Claim
66 words
A printer as reicted in claim 4, including a continuously moving character carrying means adapted to sequentially carry each of the characters to be printed through a position in operative registration with said hammers, said hammers being adapted to be carried into engagement with said character carrying means to effect printing after engagement with said stopper means due to the kinetic energy of said hammers means.
Claim 7
Dependent Claim
23 words
A printer as recited in claim 4, wherein said stopper means is displacable for returing said hammer to said rest position after printing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |