US4130406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting breakage of glass fiber filament
Assignee: Nitto Boseki Co Ltd
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Filing: 1977-08-22
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Granted: 1978-12-19
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Expires: 1997-08-22
Abstract
Abstract A method of detecting breakages of glass fiber filaments being drawn through orifies of an orifice plate by converting the variation in intensity of radiant light or heat emitted from a bead of molten glass which grows on the undersurface of the orifices plate at an orifice at which a breakage occurs into an electrical signal by a radiation thermometer which is so arranged as to reciprocate horizontally in parallel with both one side and said undersurface of said orifice plate, whereby the breakage may be detected.
Inventors
- 👤 Isao Wakasa
- 👤 Yutaka Kawaguchi
- 👤 Hiroaki Shono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:13
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/0022; C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/0203; C03B37/0213; C03B37/0216
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A method of detecting breakages of glass fiber filaments being drawn through orifices of an orifice plate, comprising the steps of arranging a radiation thermometer in such a way that a portion of a glass fiber filament at least immediately below at least one of said orifices is focused on the field of view of said radiation thermometer, and sensing by means of said radiation thermometer a variation in intensity of radiant light or heat emitted from a bead of molten glass when as a result of a breakage of the filament through said one orifice the molten glass bead grows on the undersurface of said orifice plate at said one orifice and said bead growth is focused on said field of view of said radiation thermometer to cause a variation in output from said radiation thermometer, whereby the breakage of the filament is detected based on said variation in output from said radiation thermometer.
Claim 2
Independent Claim
155 words
A method of detecting breakages of glass fiber filaments being drawn through orifices of an orifice plate, comprising the steps of arranging a radiation thermometer in such a way that a portion of a glass fiber filament at least immediately below at least one of said orifices is focused on the field of view of said radiation thermometer, and sensing by means of said radiation thermometer a variation in intensity of radiant light or heat emitted from a bead of molten glass when as a result of a breakage of the filament through said one orifice the molten glass bead grows on the undersurface of said orifice plate at said one orifice and said bead growth is focused on said field of view of said radiation thermometer to cause a variation in output from said radiation thermometer, whereby the breakage of the filament is detected based on said variation in output from said radiation thermometer.
Claim 3
Dependent Claim
45 words
A method of detecting breakages of glass fiber filaments as set forth in claim 1, wherein said radiation thermometer is so arranged that an inverted cone of molten glass formed at said one orifice is focussed on said field of view of said radiation thermometer.
Claim 4
Dependent Claim
111 words
A method of detecting breakages of glass fiber filaments being drawn through orifices of an orifice plate having a large number of orifices arranged in rows and columns as set forth in claim 1, comprising the steps of arranging said radiation thermometer in such a way that the glass fiber filaments through orifices in any one of said rows of orifices are focussed on the field of view of said radiation thermometer in overlapped relationship, and reciprocating said radiation thermometer horizontally in the directions perpendicular to said rows of orifices to scan successively and sequentially the glass fiber filaments through respective rows of orifices to detect any breakage in each row.
Claim 5
Dependent Claim
54 words
A method of detecting breakages of glass fiber filaments as set forth in claim 1, wherein said radiation thermometer is pivoted so as to be swingable about a vertical axis horizontally spaced apart by a suitable distance from the midpoint between ends of one side closest to said radiation thermometer of said orifice plate.
Claim 6
Dependent Claim
49 words
A method of detecting breakages of glass fiber filaments as set forth in claim 1, wherein said radiation thermometer is responsive to the variation in intensity of radiant light or heat emitted from objects focused on the field of view of said radiation thermometer to generate an electrical signal.
Claim 7
Dependent Claim
23 words
A method of detecting breakages of glass fiber filaments as set forth in claim 5, wherein said radiation thermometer is an optical pyrometer.
Claim 8
Dependent Claim
22 words
A method of detecting breakages of glass fiber filaments as set forth in claim 5, wherein said radiation thermometer is a thermocouple.
Claim 9
Dependent Claim
24 words
A method of detecting breakages of glass fiber filaments as set forth in claim 5, wherein said radiation thermometer is a silicon-cell type thermometer.
Claim 10
Dependent Claim
24 words
A method of detecting breakages of glass fiber filaments as set forth in claim 5, wherein said radiation thermometer is an amplification type thermometer.
Claim 11
Dependent Claim
28 words
A method of detecting breakages of glass fiber filaments as set forth in claim 5, wherein said radiation thermometer is enclosed within a casing which is normally cooled.
References Cited (Backward Citations)
US3820967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |