Patent US3727433A successfully refreshed from Google Patents.
US3727433A
Expired / Lapsed
US
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Method and apparatus for warp knitting hook and loop fasteners
Assignee: Velcro Industries BV
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Filing: 1970-11-17
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Granted: 1973-04-17
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Expires: 1990-11-17
Abstract
Abstract Novel warp knitting apparatus is disclosed for producing a knitted pile fabric suitable for use in a hook and loop fastener. In conjunction therewith, means are disclosed for heat setting the pile and for cutting pile loops to form hooks.
Inventors
- 👤 H Hamano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:37
CPC Classifications
D; D04; D04B; D04B21/00; D04B21/02; D04B23/00; D04B23/08; D04B1/00; D04B1/02; D04B27/00; D04B27/06; D04B27/08; D04B35/00; D04B35/22; D04B35/24; D10; D10B; D10B2401/00; D10B2401/04; D10B2401/041; D10B2403/00; D10B2403/01; D10B2403/011; D10B2403/0112; D10B2501/00; D10B2501/06; D10B2501/063; D10B2501/0632
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for moving said needles in a knitting cycle about said lancettes to knit a base fabric and a series of loops as a pile connected to said base fabric, said lancettes extending beyond the point of knitting for a distance to maintain said loops in uniformity with respect to each other and said base fabric, a chamber means positioned beneath said needles and surrounding at least a portion of the lancettes beyond the point of knitting, a heating medium in said chamber means in the form of heated oil surrounding extended portions of said lancettes, roller means for drawing said base fabric and pile along said lancettes and through said heating zone, and drive means for driving said roller means.
Claim 2
Independent Claim
166 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for moving said needles in a knitting cycle about said lancettes to knit a base fabric and a series of loops as a pile connected to said base fabric, said lancettes extending beyond the point of knitting for a distance to maintain said loops in uniformity with respect to each other and said base fabric, a chamber means positioned beneath said needles and surrounding at least a portion of the lancettes beyond the point of knitting, a heating medium in said chamber means in the form of heated oil surrounding extended portions of said lancettes, roller means for drawing said base fabric and pile along said lancettes and through said heating zone, and drive means for driving said roller means.
Claim 3
Dependent Claim
61 words
The apparatus according to claim 1 wherein said roller means comprises two rollers wherein a first roller is positioned immediately adjacent to and below said needles for receiving newly formed fabric, and the second roller is positioned in said oil bath for drawing said fabric and loops from said lancettes, and drive means for coordinating the rotary movement of said rollers.
Claim 4
Dependent Claim
28 words
The apparatus according to claim 2 wherein a cooling medium is provided immediately below said heated oil for cooling said fabric, and means for moving said fabric therethrough.
Claim 5
Dependent Claim
21 words
The apparatus according to claim 3 wherein said means for coordinating said movement of the roller comprises a linked belt drive.
Claim 6
Dependent Claim
26 words
The apparatus according to claim 4 wherein said means for moving said roller comprises a one-way clutch actuated by movement of actuating linkage for said needles.
Claim 7
Dependent Claim
23 words
The apparatus according to claim 1 in combination with cutting means for cutting one upstanding leg of each said loops to form hooks.
Claim 8
Dependent Claim
55 words
The apparatus according to claim 6 wherein said cutting means comprises a toothed comb For receiving said loops movement of said fabric toward said cutting means, a flat cutter blade slidably in contact with said comb and means for reciprocating said cutter blade with respect to said comb to cut the legs of said loops.
Claim 9
Dependent Claim
35 words
The apparatus of claim 7 wherein said comb and cutter blade are held in slidable contact by spring mounted pins, and said reciprocating means comprises a plate and means connecting said plate and cutter blade.
Claim 10
Dependent Claim
23 words
The apparatus of claim 8 wherein additional means are provided for adjusting said cutter in blade directions perpendicular to said reciprocal cutting movement.
Claim 11
Dependent Claim
42 words
The apparatus according to claim 6 wherein said cutting means include a comb for receiving the loops of said loop pile prior to cutting and a plurality of rotary knives are provided for cutting an upstanding leg of each of said loops.
Claim 12
Independent Claim
239 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for an actuating linkage connected to said needles, cam means for driving said linkage and said needles firstly in a general vertical direction, secondly in a general sideways direction wherein yarn is formed about said lancettes and finally in a vertical direction to complete each stitch, said base fabric being supported in part by a guide plate, a guide plate extension mounted to the upper end thereof, said guide plate extension having an upper surface portion which is sloped with respect to a horizontal plane, said guide plate extension further defining grooves between which each of said needles reciprocates vertically and further defining an angular grooved top section for guiding said needles when each reciprocates in a sideways direction, thereby providing clearance and support adjacent to said lancettes for the formation of new stitches thereupon when said needles complete said sideways motion and pull each new stitch through a previous stitch, said guide plate extension further minimizing the distance between the top of the needle and the top of the guide plate such that relatively thick monofilament fibers will result in increased tightness of the fabric due to increased tightness in the stitches.
Claim 13
Independent Claim
239 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for an actuating linkage connected to said needles, cam means for driving said linkage and said needles firstly in a general vertical direction, secondly in a general sideways direction wherein yarn is formed about said lancettes and finally in a vertical direction to complete each stitch, said base fabric being supported in part by a guide plate, a guide plate extension mounted to the upper end thereof, said guide plate extension having an upper surface portion which is sloped with respect to a horizontal plane, said guide plate extension further defining grooves between which each of said needles reciprocates vertically and further defining an angular grooved top section for guiding said needles when each reciprocates in a sideways direction, thereby providing clearance and support adjacent to said lancettes for the formation of new stitches thereupon when said needles complete said sideways motion and pull each new stitch through a previous stitch, said guide plate extension further minimizing the distance between the top of the needle and the top of the guide plate such that relatively thick monofilament fibers will result in increased tightness of the fabric due to increased tightness in the stitches.
Claim 14
Independent Claim
189 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for actuating linkage connected to said needles, cam means for driving said linkage and said needles firstly in a generally vertical direction, secondly for pivoting said needles in a generally sideways and horizontal direction wherein yarn is formed about said lancettes and finally in a vertical direction to complete each stitch, said lancettes extending beyond the point of knitting for a distance to maintain said loops in uniformity with respect to each other and said base fabric, a chamber means positioned beneath said needles and surrounding at least a portion of the lancettes beyond the point of knitting, a heating medium in said chamber means in the form of heated oil surrounding extended portions of said lancettes, and roller means for drawing said base fabric and pile along said lancettes and through said knitting zone, and drive means for driving said roller means.
Claim 15
Independent Claim
189 words
An apparatus for warp knitting loop pile fabric suitable for use as part of a hook and loop type fastener comprising a warp knitting machine having a plurality of knitting needles, a plurality of stationary lancettes mounted in a fixed position adjacent to said needles, means for actuating linkage connected to said needles, cam means for driving said linkage and said needles firstly in a generally vertical direction, secondly for pivoting said needles in a generally sideways and horizontal direction wherein yarn is formed about said lancettes and finally in a vertical direction to complete each stitch, said lancettes extending beyond the point of knitting for a distance to maintain said loops in uniformity with respect to each other and said base fabric, a chamber means positioned beneath said needles and surrounding at least a portion of the lancettes beyond the point of knitting, a heating medium in said chamber means in the form of heated oil surrounding extended portions of said lancettes, and roller means for drawing said base fabric and pile along said lancettes and through said knitting zone, and drive means for driving said roller means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |