US4582095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabric monitoring means for power looms
Assignee: ABB Norden Holding AB
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Filing: 1984-10-05
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Granted: 1986-04-15
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Expires: 2004-10-05
Abstract
Abstract A power loom for the manufacture of woven fabrics, in particular woven wire fabrics and felts for use in papermaking machines, is provided with a computerized pattern recognition system for monitoring the warp, the fabric, the edge of the fabric, the density of the weft, and so on. The device includes a video camera and computerized image processing means. By analyzing a picture taken near an edge of the fabric, digital information concerning the position of the edge of the fabric, the weft density, and so on, can be obtained. The digital information is adapted to be used in an open or closed control system for positioning the edge of the fabric in correct position, after an interruption of fabric through the loom, before a restart of the fabric feed. Digital information concerning the actual weft density can be utilized as the actual value in a weft density control system using the driving means of the warp beam of the loom as the executive members via a tensile stress control applied to the fabric.
Inventors
- 👤 Rolf Kronholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
D; D03; D03J; D03J1/00; D03J1/007; D03D; D03D51/00; D03D51/002; D03D51/007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A device for monitoring a warp and a fabric in a power loom and for positioning a weft edge of the fabric, comprising: a video camera arranged to generate electrical signals which define a picture of the warp and the fabric adjacent a weft edge, pattern recognition means for presentation of said picture on a monitor for monitoring purposes, and said pattern recognition means includes means for generating control signals from said picture, after an interruption of the fabric feed through the loom, for positioning the weft edge to a predetermined position before a restart of the fabric feed.
Claim 2
Independent Claim
99 words
A device for monitoring a warp and a fabric in a power loom and for positioning a weft edge of the fabric, comprising: a video camera arranged to generate electrical signals which define a picture of the warp and the fabric adjacent a weft edge, pattern recognition means for presentation of said picture on a monitor for monitoring purposes, and said pattern recognition means includes means for generating control signals from said picture, after an interruption of the fabric feed through the loom, for positioning the weft edge to a predetermined position before a restart of the fabric feed.
Claim 3
Dependent Claim
33 words
A device according to claim 1, further comprising driving means for positioning the weft edge to a predetermined position, and wherein said driving means drives a warp brake included in said power loom.
Claim 4
Dependent Claim
24 words
A device according to claim 1, further comprising means responsive to the generated control signals for positioning the weft edge to a predetermined position.
Claim 5
Dependent Claim
36 words
A device according to claim 3, wherein said means responsive to the control signals for positioning the weft edge to a predetermined position includes the driving means of a warp brake included in said power loom.
Claim 6
Dependent Claim
39 words
A device according to claim 3, wherein said means responsive to the control signals for positioning the weft edge to a predetermined position includes a driving means separate from the driving means for other components of said power loom.
Claim 7
Dependent Claim
55 words
A device according to claim 5, wherein said means for generating control signals includes means for analyzing said picture with respect to the position of the weft edge relative to a reference position, and said control signals correspond to the distance to said reference position and are adapted to constitute actual weft edge positioning signals.
Claim 8
Dependent Claim
53 words
A device according to claim 5, wherein said means for generating control signals includes means for analyzing said picture with respect to the weft density of the fabric, and said control signals correspond to the mean weft density for a number of weft yarns and are adapted to constitute actual weft density values.
Claim 9
Dependent Claim
60 words
A device according to claim 5, wherein said means for generating control signals includes means for analyzing said picture with respect to the appearance of both the warp and the fabric for comparison with a reference picture corresponding to the correct warp and fabric pattern, and said device further comprising means for indicating that a permissible deviation has been exceeded.
Claim 10
Dependent Claim
63 words
A device according to claim 5, wherein said means for generating control signals includes means for analyzing said picture with respect to the appearance of both the warp and the fabric for comparison with a reference picture corresponding to the correct warp and fabric pattern, and said device further comprising means for providing a stop signal to stop the feed of the fabric.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |