US4384794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printer
Assignee: Toshiba TEC Corp
•
Filing: 1981-04-01
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Granted: 1983-05-24
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Expires: 2001-04-01
Abstract
Abstract The present invention provides a printer in which a printing head confronting a platen and a paper pressing roller for pressing a recording paper are attached to the same levers mounted rotatably and turnably and the distance between the top end of the printing head and the platen can directly be changed according to the thickness of the recording paper to be inserted, whereby influences of changes of the paper thickness on the printing state can be eliminated substantially. In this printer, the distance between the top end of the printing head and the platen can be adjusted very precisely by a simple structure.
Inventors
- 👤 Noriaki Okano
- 👤 Susumu Matsuda
- 👤 Keisuke Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:47
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
A printer comprising a platen and a carrier driving member, which are disposed between confronting frames, a printing head secured to a carrier which is moved reciprocatively along the platen by the carrier driving member, at least one paper-pressing roller for pressing a recording paper inserted between the printing head and the platen, said recording paper being pressed between said paper-pressing roller and a second roller, a pair of substantially linear levers pivotably mounted on said frames around central shafts thereof, said levers being elongated along the direction of advance of the recording paper and being rotatably urged in the paper-pressing direction, a first guide shaft for holding said carrier and a second shaft for holding said paper-pressing roller, said first and second shafts being attached in parallel between said two levers, whereby a variation in the spacing between said paper-pressing roller and said second roller, due to a variation in the thickness of said recording paper, pivots said levers about said central shafts, so as to automatically adjust the position of said printing head.
Claim 2
Dependent Claim
175 words
A printer comprising a platen and a carrier driving member, which are disposed between confronting frames, a printing head secured to a carrier which is moved reciprocatively along the platen by the carrier driving member, at least one paper-pressing roller for pressing a recording paper inserted between the printing head and the platen, said recording paper being pressed between said paper-pressing roller and a second roller, a pair of substantially linear levers pivotably mounted on said frames around central shafts thereof, said levers being elongated along the direction of advance of the recording paper and being rotatably urged in the paper-pressing direction, a first guide shaft for holding said carrier and a second shaft for holding said paper-pressing roller, said first and second shafts being attached in parallel between said two levers, whereby a variation in the spacing between said paper-pressing roller and said second roller, due to a variation in the thickness of said recording paper, pivots said levers about said central shafts, so as to automatically adjust the position of said printing head.
Claim 3
Dependent Claim
33 words
A printer as set forth in claim 1, wherein the guide shaft for holding the carrier and the shaft for holding the paper pressing roller are disposed in close proximity to each other.
Claim 4
Dependent Claim
32 words
A printer as set forth in claim 1, wherein the top end of the printing head and the paper pressing roller are aligned along the direction of advance of the recording paper.
Claim 5
Dependent Claim
17 words
A printer as set forth in claim 1, wherein said second roller comprises a paper feed roller.
Claim 6
Dependent Claim
35 words
A printer as set forth in claim 1, wherein the printing head and the paper pressing roller are arranged in such a vertical relationship that the printing head is located below the paper pressing roller.
Claim 7
Dependent Claim
50 words
A printer as set forth in claim 1, wherein paper feed rollers are disposed above and below the platen to feed the recording paper upwardly, and the paper feed speed of the upper paper feed roller is slightly higher than the paper feed speed of the lower paper feed roller.
Claim 8
Dependent Claim
46 words
A printer as set forth in claim 1, wherein the levers are urged by a toggle spring in such a manner that the urging direction is changed between the paper pressing direction and the opposite paper inserting direction with a certain position being as the boundary.
Claim 9
Dependent Claim
39 words
A printer as set forth in claim 1, wherein a detecting member for detecting the positions of the levers is disposed so that when the levers are in the paper inserting state, a printing driving circuit is shut off.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |