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Patent US4128917A successfully refreshed from Google Patents.
US4128917A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carding engines
Assignee: Carding Specialists Canada Ltd
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Filing: 1977-04-29
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Granted: 1978-12-12
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Expires: 1997-04-29
Abstract
Abstract In a duo-card engine, a novel arrangement of crush rolls and toothed roller are used to break up the fibre web into individual fibres and fibre groups to free them from dirt, after which the fibres are reassembled on the surface of a perforated vacuum cage adjacent to and downstream of the toothed roller. This sequence of operations produces a yarn, not only of more regular texture but yarn in which the amount of trash, dust and small fibres can be reduced substantially by one half.
Inventors
- 👤 John M. J. Varga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:22
CPC Classifications
D; D01; D01G; D01G15/00; D01G15/02; D01G15/12; D01G15/34; D01G15/94; D01G21/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A duo-card engine comprising a breaker card having a breaker carding cylinder, means for feeding staple fibres to the breaker cylinder, a breaker doffer for doffing a web of fibres from the breaker cylinder, a pair of crush rolls downstream of the breaker doffer, a toothed roller downstream of the pair of crush rolls, rotating at a surface speed sufficient to break up the web substantially into individual fibres and fibre groups and free dirt from the same, a partly shrouded, rotatable, perforated vacuum cage adjacent to and downstream of the toothed roller, on the surface of which the fibres are reassembled, means for feeding the fibres from the cage to the cylinder of a finisher card, and a finisher doffer for doffing the web from the finisher cylinder.
Claim 2
Dependent Claim
129 words
A duo-card engine comprising a breaker card having a breaker carding cylinder, means for feeding staple fibres to the breaker cylinder, a breaker doffer for doffing a web of fibres from the breaker cylinder, a pair of crush rolls downstream of the breaker doffer, a toothed roller downstream of the pair of crush rolls, rotating at a surface speed sufficient to break up the web substantially into individual fibres and fibre groups and free dirt from the same, a partly shrouded, rotatable, perforated vacuum cage adjacent to and downstream of the toothed roller, on the surface of which the fibres are reassembled, means for feeding the fibres from the cage to the cylinder of a finisher card, and a finisher doffer for doffing the web from the finisher cylinder.
Claim 3
Dependent Claim
32 words
A duo-card carding engine according to claim 1, in which an intermediate roller is located downstream of said crush rolls and immediately preceding said toothed roller, said intermediate roller being also toothed.
Claim 4
Dependent Claim
50 words
A duo-card carding engine according to claim 2, in which the web path is around the lower arcs of the two toothed rollers, in combination with a guide member mounted in the web path between the lower converging arcs of these rollers and extends the full width of these rollers.
Claim 5
Dependent Claim
52 words
A duo-card carding engine according to claim 3, in which the guide member is set in the space between the lower converging arcs of the two toothed rollers so that it extends parallel with the axes of both said rollers and is spaced closely adjacent to the peripheral surfaces of each roller.
Claim 6
Dependent Claim
25 words
A duo-card carding engine according to claim 3, in which the guide member has a smooth, plain rounded surface over which the web may travel.
Claim 7
Dependent Claim
23 words
A duo-card carding engine according to claim 3 in combination with means for adjusting the guide member relative to the two toothed rollers.
Claim 8
Dependent Claim
75 words
A duo-card carding engine according to claim 1, in which the means for feeding the fibres from the cage to the cylinder of the finisher card comprise a transfer roller adjacent to and downstream of the vacuum cage for stripping the reassembled web from the vacuum cage, and a finisher takerin adjacent to and downstream of the transfer roller for stripping the reassembled web from the transfer roller and feeding it to the finisher cylinder.
References Cited (Backward Citations)
US1461562A
Cited
US3144686A
Cited
US3249967A
Cited
FR1375275A
Cited
US3373461A
Cited
GB1189372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |