US3681941A - Yarn feeding arrangements for circular knitting machines - Google Patents

Yarn feeding arrangements for circular knitting machines Download PDF

Info

Publication number: US3681941A
Authority: US; United States
Prior art keywords: dial; yarn; needles; feeds; cam
Prior art date: 1969-07-02
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

US48108A

Other languages

English (en)

Inventor

Henry Sidney Burdett

Ronald Harris

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

STIBBE MACHINERY Ltd

Original Assignee

STIBBE MACHINERY Ltd

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1969-07-02

Filing date

1970-06-22

Publication date

1972-08-08

1970-06-22 Application filed by STIBBE MACHINERY Ltd filed Critical STIBBE MACHINERY Ltd

1972-08-08 Application granted granted Critical

1972-08-08 Publication of US3681941A publication Critical patent/US3681941A/en

1989-08-08 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000009940 knitting Methods 0.000 title claims abstract description 28
230000007246 mechanism Effects 0.000 claims description 6
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Images

Classifications

- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B9/00—Circular knitting machines with independently-movable needles
- D04B9/26—Circular knitting machines with independently-movable needles for producing patterned fabrics
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B9/00—Circular knitting machines with independently-movable needles
- D04B9/26—Circular knitting machines with independently-movable needles for producing patterned fabrics
- D04B9/28—Circular knitting machines with independently-movable needles for producing patterned fabrics with colour patterns

Definitions

the independent cam systems are located radially [58] Field Of 19, wards of the conventional needle cam Systems. With widely spaced feeds, a single yarn catch hook for [56] Rem-"ms cued service thereat is sufficient. But with closely spaced UNITED STATES PATENTS I feeds there are two juxtaposed and differentiated yarn catch hooks, the independent cam systems in this case 3,563,059 2/1971 Martlnetz ..66/19 being so designed that the two hooks function at the alternate and the intervening feeds respectively.
This invention relates to yarn feeding arrangements I for circular knitting machines, and concerns in particular arrangements of the kind applicable to machines of the independent needle type which include a plurality of yarn guiding elements or fingers (hereinafter briefly referred to as guides) disposed side by side and automatically movable interchangeably, under pattern control, into and out of operative positions at the so-called feeds.
guides yarn guiding elements or fingers
Arrangements of this kind are used for feeding yarns of different characteristics, e.g. colors, to the needles so as correspondingly to vary the composition or/and appearance of the knitted fabric so produced, as, for example, by horizontal striping.
yarn changes are made each of the different yarns should be positively taken by the needles at the feeds of the machines, that is to say at the feed, or (as is primarily the intention) in the case of a multi-feed machine at each feed, so as to avoid the production of imperfect knitted fabric by reasons of yarns being missed or insecurely taken.
This hook has a longer actuating butt, and the dial carn system is devised by incorporation of a cam for action upon the longer butt to project the catch hook in timed relation with a yarn change, the said butt being acted upon by the normal needle retracting and stitch cams to retract the hook and so positively introduce the caught yarn to the needles required to take it safely.
the last described prior arrangement is somewhat restrictive in that the retraction of the catch hook occurs simultaneously with the retraction of the adjacent dial needles which is not as safe as controlling the catch hook independently by entirely separate cam action.
the present invention has for its objects to provide improved means for obtaining yarn engagement with the needles with certainty in the performance of yarn changes of the character aforesaid, in a simpler manner 7 tion with the actuation of the yarn changing mechanism and the knitting movements of the needles at that feed.
the invention is applicable primarily and advantageously to circular independent needle knitting machines of the cylinder and dial type equipped with independent latch needles, with the yarn catching means located in the dial and the independent cam system mounted on the dial cam cap, concentrically with the dial needle cam system which consequently remains unaltered.
the objects of the invention are achieved in a two-fold manner, that is to say 1. by providing but one single yarn catching element for service at a multiplicity of relatively widely spaced feeds with corresponding independent cam systems for the element located within the normal dial cam systems at the feeds and 2. by providing two differentiated and juxtaposed yarn catching elements in a machine having a mul- -tiplicity of closely spaced feeds, the corresponding independent cam systems in this case being so designed that the said two elements function respectively at alternate feeds. 7
FIG. 1 is a vertical sectional view of so much of such a machine as is necessary to illustrate an arrangement in which only one yarn catch hook is provided for service at a feed, the section of the dial and dial cam cap being taken on the line I I of FIG. 2,
FIG. 2 is an underside plan view of a section of the dial cam cap at one feed of the machine, this figure also showing a few of the yarn guides and the paths of the single catch hook and the dial needle hooks,
FIG. 3 is a diagrammatic representation of the paths of a catch hook and the cylinder and dial needles in relation to yarn guides in point to point timing
FIG. 4 is an equivalent representation appertaining to late timing
FIG. 5 diagrammatically represents the paths taken by two different catch hooks alternately in relation to yarn guides at closely spaced feeds of a multi-feed machine
FIGS. 6 and 7 illustrate (in the same manner as FIGS. 3 and 4) the paths of the said two different catch hooks and the cylinder and dial needles in relation to yarn guides at closely adjacent feeds, in point to point and late timing respectively, and
FIG. 8 comprises, for comparison, juxtaposed side views of the said two differentiated catch hooks.
the machine comprises a rotary needle cylinder and a correspondingly rotatable needle dial 11.
the cylinder drive gear is indicated at 12 and the head base of the machine at 13.
the cylinder 10 is formed in the usual way with tricks such as 10a each of which accommodates-an independent latch needle 14.
the dial 11 is radially tricked as at 114 to receive independent dial needles of the latch type (not shown).
Each cylinder needle 14 is furnished with an operating butt 14a arranged to be acted upon by earns 15, 16in a stationary annular cam box 17 surrounding the cylinder 10.
the stationary dial cam cap is indicated at 18.
the dial 11 and the dial cam cap 18 are supported by carriers C and C which are respectively rotatable together with the cylinder 10 and stationary.
Each section of the dial cam cap 18, one of which is illustrated in FIG. 2, has therein portions of two dial needle cam tracks 19 and 20 respectively for dial needles (not shown) all of an equal length some of which each have a butt engaging in the outer cam track 20 only, whereas the others each have two butts, one of which engages in the outer track 20 and the other of which engages in the inner track 19.
the track 19 in each cap section is defined by anadjustable clearing cam 21 and guard cams 22 and 23.
the track 20 in the section is defined by an adjustable clearing cam 24, a guard cam 25, a stitch cam 26 and the aforementioned two guard cams 22 and 23 which latter are common to both tracks. Both sets of dial needles are acted upon by the stitch cam 26.
each yarn guide 27 is arranged to turn about a pivot pin 29 and is furnished with an arm 30 by means of which it is operated.
Each guide is movable from a lower inoperative, i.e.. non-feeding, position, indicated in dotted lines, to an upper operative, i.e. yarn feeding, position represented by full lines, and vice versa.
Each striper unit 28 includes a yarn trapper 31 disposed below the level of dial needles in the dial 11.
each guide 27 has therein a feed hole 27a through which the relevant yarn Y, drawn from a supply, passes.
the line taken by such a yarn when it is withdrawn from knitting by a downward swing of the guide 27 is indicated by a dotted line, whereas the line taken by the yarn when the guide is swung upwards to present a vertical portion Y of the yarn to a catch hook is indicated by a chain line.
one yarn catch hook 32 (see FIG. I) the stem 32a of which is provided with an operating butt 32b to be acted upon by a cam system 33 (see FIG. 2) which is separate from and inside (towards the center of the machine) the hereinbefore described normal dial needle cam tracks 19 and 20.
This separate cam system generally designated 33, comprises cams 34 and 35 defining between them a track 36 for the catch hook operating butt 32b.
FIG. 2 The operation of the single yarn catch hook 32 in relation to the yarn guides 27 and the dial needles is diagrammatically illustrated in FIG. 2, the paths of the catch hook and the dial needle hooks being represented by dotted and chain lines DL and CL respectively.
the needles are assumed to be traveling from left to right in FIG. 2.
FIG. 3 which shows point to point timing, and in which needles are assumed to be travelling from right to left
the path of the hooks of the cylinder needles 14 (in a vertical plane) is indicated by a full line 37
the path of the hooks of the dial needles (in a horizontal plane)
the path of the single catch book 32 is indicated by a dotted line 39 all three paths being shown in relation to the yarn change guides 27.
FIG. 4 which shows late timing
the full line dial needle hook path 38 and the dotted line catch hook path 39 are precisely the same as in FIG. 3, the late timing being achieved by circumferentially shortening or contracting the path of the cylinder needle hooks indicated in this case by the full line 37.
Such shortening or contracting may be done by removing cylinder cams and replacing them with shorter or contracted cams.
the two catch hooks 32 and 32 are clearly shown in FIG. 8. As will be seen, the stem 32a of the hook 32 is shorter than the stem of the hook 32". The stem of the shorter catch hook is furnished with an operating butt 320 whereas the longer hook has an operating butt 32d.
FIG. 5 are depicted three complete sections of the dial cam cap 18.
Each of these sections has portions of two dial cam tracks 40 and 41 respectively for the differentiated dial needles.
the portion of the inner track 40, in each section of the dial cam cap is defined by an adjustable clearing cam 42 and two guard cams 43 and 44.
the portion of the outer track 41 in each such section is defined by an adjustable clearing cam 45, a guard cam 46 and a stitch cam 47 which latter is for causing both sets of dial needles to knit as required.
Each section of the dial cam cap 18 in this second example has a separate cam system 48 or 48 on the inside of the dial needle-tracks 40 and 41, this separate system being designed to provide one track 49 for the operating butt 32c of the shorter catch hook 32 and another track 50 for the operating butt 32d of the longer catch hook 32.
the camr'ning 51, 52 and 53 of the separate cam systems 48 at alternate feeds, and the camming 51, 52 and 53 of the separate cam systems 48 at the intervening feeds are respectively opposite hand and such that one of the two catch hooks only is brought into action at said alternate feeds and the other at said intervening feeds.
FIG. 6 which shows point to point timing at two adjacent feeds, and in which the needles are assumed to be travelling from right to left, the path of the hooks of the cylinder needles 14 (in a vertical plane) at each of these feeds is shown by full lines 54, the path of the hooks of the dial needles (in a horizontal plane) at the same feeds in indicated by full lines 55 and the paths of the two catch hooks 32 and 32 are indicated by the chain and dotted lines 56 and 57 respectively all the paths being shown in relation to the yarn guides 27.
the action of the catch hook is so timed as adequately to cover the whole of the range of yarn guides 27 at a feed so that the hook reliably catches any one of the yarns introduced to the needles on a yarn change and that yarn is gathered by the needles and knitted in with certainty.
the catch hook 32 or each of the two catch hooks 32 and 32", as the case may be, is inverted relatively to the dial needles so that the engaged yarn is easily released when securely taken by the needles.
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 needle-operating 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 diflerentiated 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
a circular knitting machine 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.
a circular knitting machine 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.
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.
a circular knitting machine wherein the cams defining the catch hook tracks are so timed as to cover the catch hooks collecting yarns from s hooks in relation to the yarn guides at the feeds are such as to result in either point to point timing(FlG. 6) or late timing (FIG. 7).
a circular knitting machine according to claim wherein the two yarn catch books of respectivelydifferent lengths are inverted relatively to the dial needles, for the purpose described.

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Engineering & Computer Science (AREA)
Textile Engineering (AREA)
Knitting Machines (AREA)

US48108A 1969-07-02 1970-06-22 Yarn feeding arrangements for circular knitting machines Expired - Lifetime US3681941A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB33421/69A GB1253580A (en)	1969-07-02	1969-07-02	Improvements in or relating to yarn feeding arrangements for circular knitting machines

Publications (1)

Publication Number	Publication Date
US3681941A true US3681941A (en)	1972-08-08

Family

ID=10352747

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
US48108A Expired - Lifetime US3681941A (en)	1969-07-02	1970-06-22	Yarn feeding arrangements for circular knitting machines

Country Status (5)

Country	Link
US (1)	US3681941A (de)
CH (1)	CH506644A (de)
DE (1)	DE2032916A1 (de)
FR (1)	FR2054057A5 (de)
GB (1)	GB1253580A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3975926A (en) *	1975-02-24	1976-08-24	Riccardo Tenconi	Feed device for circular knitting machines of the type manufacturing open fabric
US4244197A (en) *	1979-09-10	1981-01-13	Sulzer Brothers Limited	Method and apparatus for producing knit fabric
US20220325450A1 (en) *	2019-06-17	2022-10-13	Santoni S.P.A.	A circular knitting machine with an offset system for the stitch cam of the needle plate

1969
- 1969-07-02 GB GB33421/69A patent/GB1253580A/en not_active Expired
1970
- 1970-06-22 US US48108A patent/US3681941A/en not_active Expired - Lifetime
- 1970-07-01 CH CH996970A patent/CH506644A/de not_active IP Right Cessation
- 1970-07-02 DE DE19702032916 patent/DE2032916A1/de active Pending
- 1970-07-02 FR FR7024591A patent/FR2054057A5/fr not_active Expired

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3975926A (en) *	1975-02-24	1976-08-24	Riccardo Tenconi	Feed device for circular knitting machines of the type manufacturing open fabric
US4244197A (en) *	1979-09-10	1981-01-13	Sulzer Brothers Limited	Method and apparatus for producing knit fabric
US20220325450A1 (en) *	2019-06-17	2022-10-13	Santoni S.P.A.	A circular knitting machine with an offset system for the stitch cam of the needle plate
US12123116B2 (en) *	2019-06-17	2024-10-22	Santoni S.P.A.	Circular knitting machine with an offset system for the stitch cam of the needle plate

Also Published As

Publication number	Publication date
DE2032916B2 (de)	1975-04-03
DE2032916A1 (de)	1971-01-21
FR2054057A5 (de)	1971-04-16
GB1253580A (en)	1971-11-17
CH506644A (de)	1971-04-30

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