US3844101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread monitor device for textile machinery
Assignee: Individual
•
Filing: 1973-09-06
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Granted: 1974-10-29
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Expires: 1993-09-06
Abstract
Abstract To check the presence of thread close to thread handling apparatus in which the thread is apt to balloon, two hook shaped metallic thread guides, together, form a thread guiding eye; the hook shaped guides are spaced from each other in the direction of thread travel, so that they are electrically insulated. The guides act, electrically, as separate electrodes and mechanically to, conjointly, form the guiding eye. The guide-electrodes are connected over high impedance input to a differential amplifier which responds to presence of or absence of the thread which, due to the ballooning tendency, alternately contacts the one and the other of the hook-shaped guide-electrodes, to transmit pulses due to electrostatic charge on the thread to the differential amplifier or, if the thread is conductive due to moisture and low resistance material, or the presence of metallic threads, connects, alternately, a source of potential to the differential amplifier. Absence of pulses is an indication of thread breakage. An integrator delays initial sensing to permit start-up.
Inventors
- 👤 H Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:44
CPC Classifications
B; B65; B65H; B65H63/00; B65H63/02; B65H63/024; B65H63/028; B65H63/032; B65H63/0321; B65H2513/00; B65H2513/10; B65H2513/11; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
Thread monitor-device, particularly for thread handling apparatus in which the thread forms a ballon comprising two hook-shaped thread guides (1'', 1'''') of electrically conductive material, having their hooks located to be spaced from each other, in the direction of thread travel electrically insulated from each other to form, electrically two electrodes, said guides forming mechanically, in the projection of thread travel, a thread guide eye (2); a source of electrical energy (V); high impedance means (R1, R2) connecting the respective thread guide-electrodes (1'', 1'''') to said source; a differential amplifier (3); and means (C1, C2) coupling the thread guide-electrodes (1'', 1'''') to a respective input, each, of the differential amplifier, said differential amplifier providing an output signal representative of motion of thread through the thread guide eye (2) formed by said thread guide-electrodes (1'', 1'''').
Claim 2
Dependent Claim
135 words
Thread monitor-device, particularly for thread handling apparatus in which the thread forms a ballon comprising two hook-shaped thread guides (1'', 1'''') of electrically conductive material, having their hooks located to be spaced from each other, in the direction of thread travel electrically insulated from each other to form, electrically two electrodes, said guides forming mechanically, in the projection of thread travel, a thread guide eye (2); a source of electrical energy (V); high impedance means (R1, R2) connecting the respective thread guide-electrodes (1'', 1'''') to said source; a differential amplifier (3); and means (C1, C2) coupling the thread guide-electrodes (1'', 1'''') to a respective input, each, of the differential amplifier, said differential amplifier providing an output signal representative of motion of thread through the thread guide eye (2) formed by said thread guide-electrodes (1'', 1'''').
Claim 3
Dependent Claim
14 words
Device according to claim 1 wherein the coupling means comprises coupling capacitors (C1, C2).
Claim 4
Dependent Claim
27 words
Device according to claim 1 wherein the thread guide-electrodes (1'', 1'''') have approximately 180* bent-over ends and are offset by about 180* with respect to each other.
Claim 5
Dependent Claim
21 words
Device according to claim 1 wherein the thread guides (1'', 1''''), each, are made of steel wire with a hardened surface.
Claim 6
Dependent Claim
21 words
Device according to claim 1 wherein the thread guides (1'', 1'''') are made of steel wire with a hard chrome surface.
Claim 7
Dependent Claim
48 words
Device according to claim 1 further comprising an integrator (4) connected to the differential amplifier (3); and a bistable flip-flop (5) connected to the integrator and changing state when the integrator integrates an output signal from the differential amplifier in a direction representative of presence of a signal.
Claim 8
Dependent Claim
39 words
Device according to claim 6 wherein the integrator (4) and the monostable flip-flop (5) provide a unidirectional delay of the output signal from the differentiator, the flip-flop responding immediately upon change of direction of output from the differential amplifier.
Claim 9
Dependent Claim
24 words
Device according to claim 6 further comprising a monostable multivibrator triggered by change of state of said flip-flop and providing an oUtput control pulse.
Claim 10
Dependent Claim
62 words
Device according to claim 1 wherein said thread guide-electrodes (1'', 1'''') are similar, and spaced from each other in the direction of travel of the thread by a distance sufficient to electrically insulate said guide-electrodes (1'', 1'''') from each other, in the absence of a conductive thread, but insufficient to cause changes in phase or amplitude of stray noise signals induced therein.
Claim 11
Dependent Claim
74 words
Device according to claim 1 wherein the thread guides (1'', 1'''') are steel wires with a hardened surface of approximately 3 to 4 mm diameter, and are spaced from each other, in the direction of thread travel, by a distance which is sufficient to provide electrical insulation between said guide-electrodes (1'', 1''''), in the absence of a thread, and not more than about the diameter of the wires forming said thread guides (1'', 1'''').
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |