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US3985451A
Expired / Lapsed
US
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Method of measuring the pitch angle of yarns provided with a twist
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1975-08-20
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Granted: 1976-10-12
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Expires: 1995-08-20
Abstract
Abstract A method of measuring the pitch angle of yarns provided with a twist, characterized in that an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and that the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter.
Inventors
- 👤 Johann Plockl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:04
CPC Classifications
D; D07; D07B; D07B7/00; D07B7/02; D07B7/022; G; G01; G01B; G01B11/00; G01B11/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
70 words
Method of measuring the pitch angle of thread provided with a twist, wherein an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter.
Claim 2
Dependent Claim
70 words
Method of measuring the pitch angle of thread provided with a twist, wherein an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter.
Claim 3
Dependent Claim
19 words
Method according to claim 1, wherein the shutter is rotated about an axis oriented at right angles to it.
Claim 4
Dependent Claim
18 words
Method according to claim 1, wherein an electric signal is formed from the light passing through the shutter.
Claim 5
Dependent Claim
11 words
Method according to claim 2, wherein the shutter is rotated continuously.
Claim 6
Dependent Claim
14 words
Method according to claim 4, wherein the shutter is rotated at mains supply frequency.
Claim 7
Dependent Claim
29 words
Method according to claim 4, wherein in a predetermined angular position, a zero trigger signal is formed from which the angle up to the maximum electrical signal is measured.
Claim 8
Dependent Claim
37 words
Method according to claim 6, wherein the zero trigger signal is formed at the moment when the slit is standing at right angles to the longitudinal direction of the image of the thread cast onto the shutter.
Claim 9
Dependent Claim
20 words
Method according to claim 4, characterised in that the thread is moved in its longitudinal direction at a constant speed.
Claim 10
Dependent Claim
44 words
Method according to claim 8, characterised in that the number of turns travelling past the slit of the shutter per unit of time is at least ten times as great as the number of revolutions of the slitted shutter occurring per unit of time.
Claim 11
Dependent Claim
92 words
Apparatus for measuring the pitch angle of thread provided with a twist, wherein an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter, characterised in that an objective is arranged between the thread and the slitted shutter rotatable about an axis passing through the slit.
Claim 12
Dependent Claim
92 words
Apparatus for measuring the pitch angle of thread provided with a twist, wherein an image of the surface of the thread is cast onto a slitted shutter, the slitted shutter and the thread are rotatable relatively to each other about their connecting axis and the intensity of the light passing through the slitted shutter is measured as a function of the relative angle of rotation between thread and slitted shutter, characterised in that an objective is arranged between the thread and the slitted shutter rotatable about an axis passing through the slit.
Claim 13
Dependent Claim
28 words
Apparatus according to claim 10, characterised in that a beam splitter, through which the thread is illuminated at right angles, is arranged between the thread and the objective.
Claim 14
Dependent Claim
27 words
Apparatus according to claim 10, characterised in that a condenser which concentrates the light passing through the slit onto a photo-receiver is arranged behind the slitted shutter.
Claim 15
Dependent Claim
27 words
Apparatus according to claim 10, characterised in that the width of the slit corresponds substantially to the width of a reflection of one turn of the thread.
Claim 16
Dependent Claim
28 words
Apparatus according to claim 10, characterised in that the slitted shutter is fixed to a rotary bearing ring which is mounted rotatably in a stationary counter bearing ring.
Claim 17
Dependent Claim
17 words
Apparatus according to claim 14, characterised in that the rotary bearing ring is driven by a motor.
References Cited (Backward Citations)
US2824488A
Cited
US2991685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |