US3610140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for inhibiting noise in a high-speed drum printer
Assignee: Unisys Corp
•
Filing: 1969-07-17
•
Granted: 1971-10-05
•
Expires: 1989-07-17
Abstract
Abstract A method and apparatus for reducing high-frequency noise in a high-speed drum printer caused by frictional forces induced in a paper web situated between the type characters on a continuously revolving high-speed drum and a linearly moving inking ribbon. A thin tape of material having a low coefficient of friction, such as Mylar, is interposed between the drum and the paper web so that, when a hammer strikes the ribbon and drives the paper web against the tape and drum, the revolving type characters on the drum will slide over the tape surface thereby attenuating the induced vibrations in the paper web. The secondary lower frequency noise generated by the impact of the hammer against the inking ribbon, paper web, and drum is also reduced since the tape cushions the impact.
Inventors
- 👤 Nicholas Kondur Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:44
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
In the process of high-speed printing utilizing the steps of continuously rotating a character-bearing drum, advancing an inked ribbon substantially parallel to the axis of said drum and proximate the surface thereof, transporting a paper web between said ribbon and said drum, and impressing said paper web into contact with said characters by the movement of a print hammer; the improvement comprising the step of: interposing between said character-bearing drum and said paper web a narrow strip of material having a low coefficient of friction surface for attenuating high-frequency noise and induced vibration normally generated by the frictional contact of said characters and said web during close contact therebetween as caused by said drum rotation and said print hammer movement.
Claim 2
Dependent Claim
120 words
In the process of high-speed printing utilizing the steps of continuously rotating a character-bearing drum, advancing an inked ribbon substantially parallel to the axis of said drum and proximate the surface thereof, transporting a paper web between said ribbon and said drum, and impressing said paper web into contact with said characters by the movement of a print hammer; the improvement comprising the step of: interposing between said character-bearing drum and said paper web a narrow strip of material having a low coefficient of friction surface for attenuating high-frequency noise and induced vibration normally generated by the frictional contact of said characters and said web during close contact therebetween as caused by said drum rotation and said print hammer movement.
Claim 3
Dependent Claim
27 words
The improvement of claim 1, wherein the step of interposing comprises transversely advancing a strip of Mylar more slowly than the ink ribbon, through the printing area.
Claim 4
Dependent Claim
125 words
In a high-speed rotary drum printer having a continuously rotating drum with raised-type characters thereon, a paper web movably positioned proximate said drum, a movable hammer adapted to impress said paper web into contact with said type characters, and an inking ribbon movably situated between said web and said hammer, the improvement comprising a narrow strip of material having a low coefficient of friction surface interposed between said raised type characters on said rotating drum and said paper web for attenuating high-frequency noise and induced vibration normally generated by the frictional contact between said web and said characters during close contact therebetween as caused by said drum rotation and said hammer movement, and means for moving said strip transversely to the path of said web.
Claim 5
Dependent Claim
125 words
In a high-speed rotary drum printer having a continuously rotating drum with raised-type characters thereon, a paper web movably positioned proximate said drum, a movable hammer adapted to impress said paper web into contact with said type characters, and an inking ribbon movably situated between said web and said hammer, the improvement comprising a narrow strip of material having a low coefficient of friction surface interposed between said raised type characters on said rotating drum and said paper web for attenuating high-frequency noise and induced vibration normally generated by the frictional contact between said web and said characters during close contact therebetween as caused by said drum rotation and said hammer movement, and means for moving said strip transversely to the path of said web.
Claim 6
Dependent Claim
10 words
The printer of claim 3 wherein said material is Mylar.
References Cited (Backward Citations)
US1801396A
Cited
US2044630A
Cited
US2418698A
Cited
US2699244A
Cited
US2849096A
Cited
US3090297A
Cited
US3143063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |