US3852141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strand clamping apparatus for automatic knock off system
Assignee: PPG Industries Inc
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Filing: 1972-12-11
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Granted: 1974-12-03
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Expires: 1992-12-11
Abstract
Abstract An automatic knock-off system for use in a fiber glass filament coating process to stop and hold a strand, made up of a plurality of filaments, whenever a single filament breaks, or when the package being wound becomes full. The system includes a sensor element responsive to the end of a filament or to its breakage for operating a strand holding mechanism and for shutting down the strand winder.
Inventors
- 👤 C Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
D; D06; D06B; D06B3/00; D06B3/34; D06B3/36; B; B65; B65H; B65H63/00; B65H63/02; B65H63/024; B65H63/036; C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/16; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
In an automatic knock-off system for use with a fiber glass coating apparatus, a source of supply for a plurality of glass filaments, means for forming said plurality of filaments into a single strand, means for feeding said single strand through said coating apparatus, motor driven winder means for wrapping said single strand onto a package after the single strand has been coated, clamp means responsive to a discontinuity in any one of said plurality of filaments for grasping said single strand on both sides of said coating apparatus to thereby hold said single strand taut in said apparatus, said clamp means including first and second strand holders, said strand holders being actuable sustantially simultaneously to grasp said strand and each including therein mechanically movable strand gripping means around said single strand and biased to allow free movement of said single strand and actuator means for said clamp means for moving each said strand gripping means into contact with said single strand to grasp and hold said strand.
Claim 2
Dependent Claim
168 words
In an automatic knock-off system for use with a fiber glass coating apparatus, a source of supply for a plurality of glass filaments, means for forming said plurality of filaments into a single strand, means for feeding said single strand through said coating apparatus, motor driven winder means for wrapping said single strand onto a package after the single strand has been coated, clamp means responsive to a discontinuity in any one of said plurality of filaments for grasping said single strand on both sides of said coating apparatus to thereby hold said single strand taut in said apparatus, said clamp means including first and second strand holders, said strand holders being actuable sustantially simultaneously to grasp said strand and each including therein mechanically movable strand gripping means around said single strand and biased to allow free movement of said single strand and actuator means for said clamp means for moving each said strand gripping means into contact with said single strand to grasp and hold said strand.
Claim 3
Dependent Claim
17 words
The system of claim 1, wherein said strand gripping means includes a loop passing around said strand.
Claim 4
Dependent Claim
29 words
The system of claim 1, wherein said actuator means comprises a pneumatic cylinder having a movable piston, said strand gripping means being connected to said piston for movement therewith.
Claim 5
Dependent Claim
29 words
The system of claim 3, wherein said actuator means further comprises pneumatic means for moving said piston in said pneumatic cylinder, and valve means for regulating said pneumatic means.
Claim 6
Dependent Claim
25 words
The system of claim 4, wherein said valve means is a solenoid-operated valve operable in response to a discontinuity in any one of said filaments
Claim 7
Dependent Claim
31 words
The system of claim 5, further including sensor means for each said filament, each said sensor means being responsive to a discontinuity in a corresponding filament to actuate said solenoid-operated valve.
Claim 8
Dependent Claim
28 words
The system of claim 6, further including control means responsive to all of said sensors, said controL means including first electrical switch means for energizing said solenoid-operated valve.
Claim 9
Dependent Claim
23 words
The system of claim 7, wherein said control means further includes means for stopping said motor-driven winder whenever said clamp means is actuated.
Claim 10
Dependent Claim
29 words
The system of claim 8, wherein said control means includes relay means energizable in response to operation of each of said sensors to operate said first electrical switch means.
Claim 11
Dependent Claim
24 words
The system of claim 9, wherein said control means incudes second electrical switch means responsive to said relay means for operating said motor-driven winder.
Claim 12
Dependent Claim
36 words
The system of claim 10 wherein said first strand holder is located on said single strand prior to said coating apparatus, and said second strand holder is located on said single strand following said coating apparatus.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |