Patent US3688958A successfully refreshed from Google Patents.
US3688958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for sensing thread passage to control machine operation
Assignee: Shaw Intellectual Property Holdings Inc
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Filing: 1970-11-16
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Granted: 1972-09-05
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Expires: 1990-11-16
Abstract
Abstract A thread supervising device preferably for use in a shuttleless looms having a sensing element for producing an electric signal in accordance with an intermittent withdrawal of a thread from a thread supply, the signal in turn being supervised at least during a predetermined period of the withdrawal of the thread by an electronic device for filtering and amplifying and for rendering a thread withdrawing means inoperative upon breakage of the thread, the supervising period being determined by electrical switch means.
Inventors
- 👤 Sten-Ake Olaus Rydborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:10
CPC Classifications
D; D03; D03D; D03D51/00; D03D51/18; D03D51/34; B; B65; B65H; B65H63/00; B65H63/02; B65H63/024; B65H63/028; B65H63/032; B65H63/0321; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
171 words
A stop motion device for a thread comprising means for intermittently withdrawing thread from a thread supply, sensing means in contact with said thread for sensing said thread and for producing an electrical signal in response to the friction of said thread against said sensing means during the period of withdrawal of said thread from said thread supply, said sensing means including a sensing body of piezoelectric material, and electrical contact means engaging said body, electronic means connected to the electrical contact means engaging the body for stopping the thread withdrawing means upon a breakage of said thread, said electronic means including a first portion for filtering and amplifying said electrical signal, a second portion connected to the first portion for supervising the said signal during at least a period of intermittent withdrawal of said thread, electrical switch means for determining said supervising period, and relay means which is operative, upon the disappearance of said supervised signal during the supervising period when the thread breaks, to stop the thread withdrawing means.
Claim 2
Dependent Claim
171 words
A stop motion device for a thread comprising means for intermittently withdrawing thread from a thread supply, sensing means in contact with said thread for sensing said thread and for producing an electrical signal in response to the friction of said thread against said sensing means during the period of withdrawal of said thread from said thread supply, said sensing means including a sensing body of piezoelectric material, and electrical contact means engaging said body, electronic means connected to the electrical contact means engaging the body for stopping the thread withdrawing means upon a breakage of said thread, said electronic means including a first portion for filtering and amplifying said electrical signal, a second portion connected to the first portion for supervising the said signal during at least a period of intermittent withdrawal of said thread, electrical switch means for determining said supervising period, and relay means which is operative, upon the disappearance of said supervised signal during the supervising period when the thread breaks, to stop the thread withdrawing means.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1, wherein said first portion of the electronic means comprises a frequency-balanced amplifier.
Claim 4
Dependent Claim
29 words
A device as claiMed in claim 1, wherein said second portion of the electronic means comprises a transistor gate means and an oscillator means connected to the relay means.
Claim 5
Dependent Claim
68 words
A device as claimed in claim 3, wherein said oscillator means comprises a capacitor connected to said transistor gate means and a switch transistor of unijunction type connected to said capacitor, said capacitor being incompletely charged for operation of said switch transistor means for producing a signal to operate the relay means for stopping the thread withdrawing means upon breakage of the thread unless said gate is opened.
Claim 6
Dependent Claim
77 words
A device as claimed in claim 3, wherein said electronic means comprises a mechanical switch means and an electronic switch means connected with said transistor gate means, said mechanical switch means being opened at the beginning of said supervising period and said electronic switch means being closed at the end of said supervising period, whereby said transistor gate means is closed by said electrical signal and opened if the signal disappears upon a breakage of the thread.
Claim 7
Dependent Claim
33 words
A device as claimed in claim 4, wherein said mechanical switch means comprises a limit switch and a cam disk operatively coupled to said limit switch and driven by the thread withdrawing means.
Claim 8
Dependent Claim
28 words
A device as claimed in claim 4, wherein said electronic switch means is of photoelectric type and operable by means which is provided on the thread withdrawing means.
Claim 9
Dependent Claim
53 words
A device as claimed in claim 7, wherein said mechanical switch means comprises a limit switch, said electronic switch means comprising a thyristor which on receiving a pulse from a photoelectric element is conductive until the limit switch which is connected in parallel with the thyristor and the electronic switch means is closed.
Claim 10
Dependent Claim
29 words
A device as claimed in claim 1, wherein said sensing means further comprises guiding means for guiding a plurality of threads and in separate contact with said sensing body.
Claim 11
Dependent Claim
30 words
A device as claimed in claim 9, wherein said guiding means comprises ceramic bushings, said sensing body comprising a plate, said bushings being pressed against opposite surfaces of said plate.
Claim 12
Dependent Claim
22 words
A device as claimed in claim 9, wherein said electrical contact means comprises a pair of contact strips for said sensing body.
Claim 13
Dependent Claim
44 words
A device as claimed in claim 1, wherein said sensing body is a rod, said sensing means further comprising means for guiding the thread disposed on said rod, and a wire twisted around said rod and the guiding means to fix the same together.
Claim 14
Dependent Claim
47 words
A device as claimed in claim 12, comprising a body of silicone rubber, said rod, guiding means and wire being moulded into said body of silicone rubber, and conducting wires each connected to one end of the rod and extending out of the body of silicone rubber.
References Cited (Backward Citations)
US2578620A
Cited
US3361314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |