Patent US3722260A successfully refreshed from Google Patents.
US3722260A
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Method and apparatus for detecting weight variations of a sliver on spinning preparatory machines
Assignee: Maschinenfabrik Rieter AG
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Filing: 1971-03-05
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Granted: 1973-03-27
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Expires: 1991-03-05
Abstract
Abstract A method and apparatus for detecting weight variations of a sliver on spinning preparatory machines, such as cards, draw frames and similar machines, at which the sliver passes through the channel or duct of a sliver funnel or trumpet. According to the invention, the sliver is initially condensed in the sliver funnel duct in order to expel entrained air. Immediately thereafter the sliver is again expanded and by virtue of such expansion there is produced at the expansion zone a pneumatic vacuum which is proportional to the weight variations of the throughpassing sliver. This generated vacuum is then advantageously employed to control an amplifier for performing a desired operation, namely a measuring or control.
Inventors
- 👤 P Staheli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:46
CPC Classifications
D; D01; D01H; D01H5/00; D01H5/18; D01H5/32; D01H5/38; D01H13/00; D01H13/14; D01H13/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method of detecting weight variations of a sliver on spinning preparatory machines, such as cards, draw frames and similar machines, at which the sliver passes through the duct of a sliver funnel, comprising the steps of: initially condensing the sliver in the duct of the sliver funnel in order to expel air entrained by the sliver, immediately thereafter expanding the condensed sliver in an expansion zone, generating in the expansion zone a pneumatic vacuum which is proportional to the weight variations of the throughpassing sliver, and utilizing the generated pneumatic vacuum for controlling an amplifier.
Claim 2
Independent Claim
96 words
A method of detecting weight variations of a sliver on spinning preparatory machines, such as cards, draw frames and similar machines, at which the sliver passes through the duct of a sliver funnel, comprising the steps of: initially condensing the sliver in the duct of the sliver funnel in order to expel air entrained by the sliver, immediately thereafter expanding the condensed sliver in an expansion zone, generating in the expansion zone a pneumatic vacuum which is proportional to the weight variations of the throughpassing sliver, and utilizing the generated pneumatic vacuum for controlling an amplifier.
Claim 3
Independent Claim
114 words
An apparatus for detecting weight variations of a sliver, comprising a sliver funnel provided with a sliver throughpassage duct extending between a sliver inlet side and a sliver outlet side of said sliver funnel, said duct decreasing in cross-section in the direction of throughput of the sliver to a location of minimum cross-section disposed intermediate said inlet side and said outlet side, said duct increasing in cross-section from said location of minimum croSs-section toward said outlet side to define therebetween a region of increasing cross-section of the duct, and a connection duct for an amplifying device provided at said region of increasing cross-section, said connection duct penetrating through the wall of said sliver funnel.
Claim 4
Independent Claim
114 words
An apparatus for detecting weight variations of a sliver, comprising a sliver funnel provided with a sliver throughpassage duct extending between a sliver inlet side and a sliver outlet side of said sliver funnel, said duct decreasing in cross-section in the direction of throughput of the sliver to a location of minimum cross-section disposed intermediate said inlet side and said outlet side, said duct increasing in cross-section from said location of minimum croSs-section toward said outlet side to define therebetween a region of increasing cross-section of the duct, and a connection duct for an amplifying device provided at said region of increasing cross-section, said connection duct penetrating through the wall of said sliver funnel.
Claim 5
Dependent Claim
54 words
The apparatus as defined in claim 2, wherein said region of increasing cross-section of said duct defines a sliver exit duct portion, said sliver exit duct portion being provided with a recess at the wall of said sliver funnel at the location of entry of the connection duct into said region of increasing cross-section.
Claim 6
Dependent Claim
51 words
The apparatus as defined in claim 2, wherein said region of increasing cross-section defines a sliver exit duct portion, said sliver exit duct portion being provided with a groove at the wall of said sliver funnel at the location of entry of said measuring duct into said region of increasing cross-section.
Claim 7
Dependent Claim
30 words
The apparatus as defined in claim 4, wherein said region of increasing cross-section is defined by tapered walls which enclose an angle Alpha in the range of 6* to 16*.
Claim 8
Dependent Claim
38 words
The apparatus as defined in claim 5, wherein the entry of said connection duct into said region of increasing cross-section forms an angle Beta with the sliver output direction which is in the range of 30* to 85*.
Claim 9
Dependent Claim
27 words
The apparatus as defined in claim 2, wherein said region of increasing cross-section is defined by tapering walls which enclose an angle which does not exceed 25*.
Claim 10
Dependent Claim
32 words
The apparatus as defined in claim 2, wherein entry of said duct into said region of increasing cross-section forms an angle Beta with the sliver throughput direction which does not exceed 90*.
Claim 11
Dependent Claim
34 words
The apparatus as defined in claim 2, wherein the entry of said connection duct into said region of increasing cross-section forms an angle Beta with the sliver output direction which does not exceed 90*.
Claim 12
Dependent Claim
17 words
The apparatus as defined in claim 2, further including amplifier means operatively connected with said connection duct.
Claim 13
Dependent Claim
15 words
The apparatus as defined in claim 10, wherein said amplifier means is a fluid amplifier.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |