US3681941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yarn feeding arrangements for circular knitting machines
Assignee: STIBBE MACHINERY Ltd
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Filing: 1970-06-22
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Granted: 1972-08-08
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Expires: 1990-06-22
Abstract
Abstract A multi-feed circular knitting machine of the cylinder and dial type is equipped with selectively operable yarn change guides at each feed and has located in its needle dial yarn catching means for engaging a yarn supplied by a guide and positively introducing it to the cylinder needles. The dial cam cap has mounted on it entirely independent cam systems at the feeds for operating the yarn catching means in timed relation with the guides and the movements of the needles. The independent cam systems are located radially inwards of the conventional dial needle cam systems. With widely spaced feeds, a single yarn catch hook for service thereat is sufficient. But with closely spaced feeds there are two juxtaposed and differentiated yarn catch hooks, the independent cam systems in this case being so designed that the two hooks function at the alternate and the intervening feeds respectively.
Inventors
- 👤 Henry Sidney Burdett
- 👤 Ronald Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:32
CPC Classifications
D; D04; D04B; D04B9/00; D04B9/26; D04B9/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
A circular knitting machine comprising, in combination, a needle cylinder, independent knitting needles in said cylinder, a cam box which surrounds said cylinder and is fitted with needleoperating cams; a multiplicity of closely spaced feeds, a radially tricked needle dial equipped with dial needles and an associated dial cam cap furnished at the feed with a conventional dial needle cam system, a yarn changing mechanism at eAch feed including a plurality of yarn guides disposed side by side for feeding yarns of different characteristics to the needles, said guides being automatically movable interchangeably into and out of yarn feeding positions; and yarn catching means including two differentiated and juxtaposed yarn catching elements for cooperation with the yarn guides at the feed, the machine being characterized in that it is provided at the feed with an entirely independent cam system for effecting the requisite movements of the said two yarn catching elements in timed relation with the actuation of the yarn change guides and the knitting movements of the needles at the feed, said independent cam system being located radially farther towards the center of the machine than the conventional dial needle cam systems and being so designated that the two elements function at alternate and intervening feeds respectively.
Claim 2
Dependent Claim
208 words
A circular knitting machine comprising, in combination, a needle cylinder, independent knitting needles in said cylinder, a cam box which surrounds said cylinder and is fitted with needleoperating cams; a multiplicity of closely spaced feeds, a radially tricked needle dial equipped with dial needles and an associated dial cam cap furnished at the feed with a conventional dial needle cam system, a yarn changing mechanism at eAch feed including a plurality of yarn guides disposed side by side for feeding yarns of different characteristics to the needles, said guides being automatically movable interchangeably into and out of yarn feeding positions; and yarn catching means including two differentiated and juxtaposed yarn catching elements for cooperation with the yarn guides at the feed, the machine being characterized in that it is provided at the feed with an entirely independent cam system for effecting the requisite movements of the said two yarn catching elements in timed relation with the actuation of the yarn change guides and the knitting movements of the needles at the feed, said independent cam system being located radially farther towards the center of the machine than the conventional dial needle cam systems and being so designated that the two elements function at alternate and intervening feeds respectively.
Claim 3
Dependent Claim
44 words
A circular knitting machine according to claim 1, characterized in that the yarn catching means are located in the said dial, and the entirely independent cam system is mounted on the dial cam cap concentrically with respect to the conventional dial needle cam system.
Claim 4
Dependent Claim
106 words
A circular knitting machine according to claim 1, wherein two yarn catch hooks with stems of different lengths each occupies a dial needle trick in the dial, said tricks being close to one another, and the stems having thereon butts arranged to be operated upon by cams defining two independent and respectively separate catch hook tracks in the dial cam cap - one track for the butt of the shorter catch hook and the other track for the butt of the longer catch hook whereby one of the two catch hooks only is brought into action at alternate feeds and the other at the intervening feeds.
Claim 5
Dependent Claim
27 words
A circular knitting machine according to claim 3, wherein there are in the dial cam cap inner and outer dial cam tracks respectively for differentiated dial needles.
Claim 6
Dependent Claim
57 words
A circular knitting machine according to claim 3, wherein the cams defining the catch hook tracks are so timed as to cover the catch hooks collecting yarns from selected yarn guides at the feeds and feeding those yarns into the hooks of the cylinder needles and holding the said yarns until such needles have locked them in.
Claim 7
Dependent Claim
70 words
A circular knitting machine according to claim 5, wherein the path of the hooks of the cylinder needles at each feed, the path of the hooks of the dial needles at the same feeds and the paths of the two yarn catch hooks in relation to the yarn guides at the feeds are such as to result in either point to point timing (FIG. 6) or late timing (FIG. 7).
Claim 8
Dependent Claim
29 words
A circular knitting machine according to claim 3, wherein the two yarn catch hooks of respectively different lengths are inverted relatively to the dial needles, for the purpose described.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |