US3815461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for chopping strand
Assignee: Johns Manville Corp
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Filing: 1972-10-26
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Granted: 1974-06-11
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Expires: 1992-10-26
Abstract
Abstract Strands of glass filaments are advanced directly from the bushings in which they are formed to a chopper. The chopper is arranged to issue short lengths of strand along a generally horizontal trajectory to deposit the strand on a conveyor with a component of motion in the conveying direction. Cantilever mounted blade, and back-up rolls have their axes horizontal and are generally one above the other. Starting of the strand is facilitated by a back-up roll of substantially greater axial length than the blade roll so that strand can be carried over a guide and at least partially around the unobstructed, free end of the back-up roll to initiate the pulling of the strand. A holddown roll having a tapered nose and of an axial length intermediate that of the back-up roll and blade roll is brought into pressure engagement with the back-up roll after the initial strand turn is taken. The drive of the blade roll and back-up roll at the filament pull speed of the bushing is quickly achieved as the strand guide, aligned with the blade roll, directs the strand along a helical path and into the blade roll.
Inventors
- 👤 S Genson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:28
CPC Classifications
D; D01; D01G; D01G1/00; D01G1/02; D01G1/04; C; C03; C03B; C03B37/00; C03B37/10; C03B37/16; Y; Y10; Y10S; Y10S83/00; Y10S83/913; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4838; Y10T83/4841
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
277 words
A chopper for cutting continuous strands of fibers into short lengths including a frame, a blade roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis; a plurality of blades mounted on said blade roll extending generally parallel to the axis thereof and protruding generally radially therefrom; a back-up roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis, said back-up roll axis being parallel to said blade roll axis; and a cylindrical working face on said back-up roll; said blade roll and said back-up roll being so spaced that said blades are engageable with said working face to define a chopping region; said working face proximate the free end of said back-up roll extending beyond the region engageable by said blades whereby strand can be engaged with said working face and free of said blades in a region of the working face proximate said blade roll and intersected by the plane defined by said blade roll and backup roll axes at the free end of said back-up roll; and a pressure roll, said pressure roll having a cylindrical surface engaged with said back-up roll for an axial length at least including the axial length of said chopping region and short of the free end of said back-up roll whereby strand can be engaged with said working face and free of said pressure roll at the free end of said backup roll and strand is engaged by and passes between said back-up roll and said pressure roll when said strand passes through said chopping region.
Claim 2
Dependent Claim
277 words
A chopper for cutting continuous strands of fibers into short lengths including a frame, a blade roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis; a plurality of blades mounted on said blade roll extending generally parallel to the axis thereof and protruding generally radially therefrom; a back-up roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis, said back-up roll axis being parallel to said blade roll axis; and a cylindrical working face on said back-up roll; said blade roll and said back-up roll being so spaced that said blades are engageable with said working face to define a chopping region; said working face proximate the free end of said back-up roll extending beyond the region engageable by said blades whereby strand can be engaged with said working face and free of said blades in a region of the working face proximate said blade roll and intersected by the plane defined by said blade roll and backup roll axes at the free end of said back-up roll; and a pressure roll, said pressure roll having a cylindrical surface engaged with said back-up roll for an axial length at least including the axial length of said chopping region and short of the free end of said back-up roll whereby strand can be engaged with said working face and free of said pressure roll at the free end of said backup roll and strand is engaged by and passes between said back-up roll and said pressure roll when said strand passes through said chopping region.
Claim 3
Dependent Claim
39 words
A chopper according to claim 1 wherein said working face proximate the free-end of said back-up roll extends beyond the chopping region a distance at least equal to the length of the chopping region parallel to the roll axes.
Claim 4
Dependent Claim
48 words
A chopper according to claim 1 wherein strand is advanced generally normal to the axes of said back-up roll from a first side; and said pressure roll is cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis.
Claim 5
Dependent Claim
33 words
A chopper according to claim 3 wherein said pressure roll has adjacent its free end a tip region of a gradually diminishing diameter contiguous with its cylindrical Surface engaged with said back-up roll.
Claim 6
Dependent Claim
13 words
A chopper according to claim 1 wherein said working face is an elastomer.
Claim 7
Dependent Claim
22 words
A chopper according to claim 1 including means for adjusting the spacing between said blade roll axis and said back-up roll axis.
Claim 8
Dependent Claim
60 words
A chopper according to claim 6 wherein said adjusting means comprises a slide; ways for said slide secured to said frame and mounted to define slide motion parallel to the plane defined by the axes of said blade roll and said back-up roll and normal to said axes; and support means for one of said rolls mounted on said slide.
Claim 9
Dependent Claim
249 words
A chopper for cutting continuous strands of fibers into short lengths including a frame, a blade roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis; a plurality of blades mounted on said blade roll extending generally parallel to the axis thereof and protruding generally radially therefrom; a back-up roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis, said back-up roll axis being parallel to said blade roll axis; and a cylindrical working face on said back-up roll; said blade roll and said back-up roll being so spaced that said blades are engageable with said working face to define a chopping region; said working face proximate the free end of said back-up roll extending beyond the region engageable by said blades whereby strand can be engaged with said working face and free of said blades in a region of the working face proximate said blade roll and intersected by the plane defined by said blade roll and back-up roll axes at the free end of said back-up roll; and a drive; a drive train from said drive to said blade roll to drive said roll in rotation about its axis, and a drive train from said drive to said back-up roll to drive said roll in rotation about its axis whereby the drive of said blade roll is independent of the drive of said back-up roll.
Claim 10
Dependent Claim
249 words
A chopper for cutting continuous strands of fibers into short lengths including a frame, a blade roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis; a plurality of blades mounted on said blade roll extending generally parallel to the axis thereof and protruding generally radially therefrom; a back-up roll cantilever mounted for rotation on said frame to extend one end free and to be rotatable about its cylindrical axis, said back-up roll axis being parallel to said blade roll axis; and a cylindrical working face on said back-up roll; said blade roll and said back-up roll being so spaced that said blades are engageable with said working face to define a chopping region; said working face proximate the free end of said back-up roll extending beyond the region engageable by said blades whereby strand can be engaged with said working face and free of said blades in a region of the working face proximate said blade roll and intersected by the plane defined by said blade roll and back-up roll axes at the free end of said back-up roll; and a drive; a drive train from said drive to said blade roll to drive said roll in rotation about its axis, and a drive train from said drive to said back-up roll to drive said roll in rotation about its axis whereby the drive of said blade roll is independent of the drive of said back-up roll.
Claim 11
Dependent Claim
33 words
A chopper according to claim 8 including a variable speed coupling in one of said drive trains whereby the relative rotational speed of said blade roll and said back-up roll can be adjusted.
Claim 12
Dependent Claim
22 words
A chopper according to claim 9 includes means for adjusting the spacing between said blade roll axis and said back-up roll axis.
Claim 13
Dependent Claim
151 words
A chopper according to claim 3 including a slide; ways for said slide secured to said frame and mounted to define slide motion parallel to the plane defined by the axes of said blade roll and said back-up roll and normal to said axes; support means for said blade roll mounted on said slide; means to advance and retract said slide along said ways; a drive; a first drive train from said drive to said blade roll to drive said roll in rotation about its axis; take-up means in said first drive for accommodating displacement of said slide along said ways; a second drive train from said drive to said back-up roll to drive said roll in rotation about its axis; and a variable speed coupling in said second drive train to provide means to adjust the rotational speed of said back-up roll relative to the speed of said blade roll.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |