US3050970A - Yarn cutting means for knitting machine - Google Patents

Yarn cutting means for knitting machine Download PDF

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Publication number
US3050970A
US3050970A US792396A US79239659A US3050970A US 3050970 A US3050970 A US 3050970A US 792396 A US792396 A US 792396A US 79239659 A US79239659 A US 79239659A US 3050970 A US3050970 A US 3050970A
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Prior art keywords
yarn
cylinder
duct
needles
cutting
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Expired - Lifetime
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US792396A
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English (en)
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Billi Giorgio
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Individual
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Individual
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/60—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices
    • D04B15/61—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices arranged within needle circle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S112/00—Sewing
    • Y10S112/01—Suction thread cutting

Definitions

  • This invention relates to improvements in circular knitting machines, especially for the manufacture of stockings, socks and the like. These machines produce fabrics characteristically provided with extensions or tails of yarns extending out of the fabric. These extensions are produced at both the start and end of knitting of the fabric. Generally the operator of the machine knitting the fabric must cut these yarn extensions. This operation is time consuming, costly and often results in damage to the fabrics due to difficulty in cutting the yarns particu larly when the cutting must be done at high speed.
  • a cutting and retaining means including a nipper and spring on the cover overlying the Working zone of the needles on the needle cylinder.
  • the arrangement is designed for temporarily gripping the yarn at the start and end of working each yarn. The yarn must be withdrawn from the spring during return movements of the needles which have knitted the yarn, in order to bring it back into working position.
  • a knife cutting system is provided in the machine.
  • the present invention has as an object an improved cutting arrangement for yarn in a circular knitting machine, including a suction duct which yieldably retains ends of yarns extending from yarn guides until they can be withdrawn by the working needles.
  • a further object is to provide a cutting arrangement which produces such short tails or extensions of yarn at the beginning and end of Working of the yarn in the fabric that no subsequent cutting or trimming of the yarn ends are necessary.
  • Another object is to provide a cutting arrangement in a circular knitting machine including one or more suction ducts, and yarn cutting means which may be incandescent electrical resistors, electric arc discharge devices, etc.
  • an arrangement which efiects cutting of the yarn when a yarnguide is raised for excluding a yarn from working.
  • the cutting system effects cutting near the last needle which has picked up and has stitched the yarn to be cut.
  • the arrangement is such that a residual length of yarn is guided by the yarn-guide into the suction duct, and has a length determined b ythe relative positions of the yarn-guide and the stitching position of the needles. This last arrangement allows the yarn which has been stitched to be cut to the desired residual length.
  • the duct has a substantially flattened form and an intake mouth or inlet, which extends from the yarn feed zone, that is, from the location of the yarnguide through a predetermined arc to a posi tion over the stitching location of the needle cylinder.
  • the yarn cutting system At the end of the duct (in the direction of rotation of the needle cylinder) there is located the yarn cutting system. Means are provided to assure such a positioning of the yarn that the portion of the residual yarn emerging out of the yarn-guide is drawn back by suction in the duct in the most appropriate position to be inserted again later between the needles to be picked up and then stitched.
  • a cutting system may be advantageously formed by a small electrical resistor designed to cut the yarn when this yarn is brought near to it.
  • Other cutting systems may be provided near to the path of movement of the needles such as a voltaic are or the like.
  • FIG. 1 is an elevational view partly in vertical axial section of a needle cylinder according to the invention.
  • FIG. 2 is a section taken along the line II-II of FIG. 1.
  • FIG. 3 is a side view taken along the line III-III of FIG. 2.
  • FIGS. 4, 5, 6 and 7 illustrate some steps at the start of Working with a certain yarn.
  • FIG. 8 is a diagrammatical cylindrical development of a needle cylinder.
  • FIG. 9 illustrates an embodiment including a yarn cutting arrangement.
  • FIGS. 10 and 11 illustrate two embodiments adapted for a two-feed knitting machine.
  • 1 denotes a needle cylinder provided with vertical grooves to house needles 2.
  • a cover 3 is located over the needle cylinder.
  • a yarn locking arrangement for the yarns coming from the yarnguides 4a, 4b, etc., is located on the cover 3.
  • the stitching zone 5 shown in FIG. 2 in plan view corresponds to the location of the lowered needles 2 in the cylinder 1 where the needles stitch the yarn.
  • the duct 8 has an elongated flattened suction mouth or inlet adjacent the needle working zone between the feed zone of the yarn-guides 4a, 4b, etc. and the stitching zone 5.
  • the duct 8 is provided. with a tapered union 9 serving as a suction conduit.
  • the suction efiects the locking of the yarns such as those denoted by 10, coming from the yarn-guides 4a, 4b, etc.
  • the suction may be obtained from a suitable suction producing apparatus (not shown).
  • ltla denotes the portion of yarn which is instantaneously located between a yarn-guide and a needle which has risen; 10b denotes the residual portion of a yarn engaged by the needles. This portion of yarn is submitted to the suction in the duct 8; denotes the portion of yarn which is in the raised yarn-guide such as 44: of FIG. 1, which yarn portion is drawn in by the duct 8.
  • the cutting means is formed by a wire 11. made incandescent by the passage of a current, which instantaneously cuts the yarn moving near to it, either by melting or by combustion.
  • a guide element formed by a roof extension 12 which assures the best position of the cut residual yarn to be sucked in by the duct 8.
  • An intermediate position of the tail is indicated by one thereof in FIG. 5.
  • a final position is indicated in FIG. 6.
  • the sliding of the residual portion of yarn liib ceases and the return of the yarn begins at 10a.
  • the residual portion of the yarn ltlb is reduced to that required and permissible in finished fabric.
  • the tail 10b in the fabric is formed during rotation of the cylinder as shown in FIG. 7.
  • the portion 10a of the yarn remaining included between the yarn-guide 4a and the resistor 11 is presented at the opening of the duct 8 where it is retained in duct extension 12.
  • the yarn end is drawn by the suction set up by duct 8 into the duct until it assumes the position indicated at 100 with respect to the raised yarn-guides.
  • the yarn end 10c is again drawn out of the duct as already described.
  • the position of the resistor 11 determines the length of the portion of the yarn 10b which remains at the start of the working with a certain yarn, and determines the length of the residual yarn 10d at the end of the working.
  • the shears formed by the stationary member 15 and the movable member 16 are raised through a rocker arm 18 and a tie rod 17 by the lever 19.
  • the lever is controlled by a tappet 20 controlled, in turn, by a cam 21.
  • the movement of the blade 16 is effected by tripping tappet 20 as it rides on cam 21 and by the action of springs 22, 23.
  • the cutting occurs near the path of movement of the needles 2 to leave a limited final length 10d of yarn.
  • a duct 24 much more arcuately extended than that of duct 8 previously described.
  • Duct 24 is employed in a two-feed machine having two sets of yarn-guides 25 and 26.
  • the duct 24 is provided with a baffle or interruption 27 in its month.
  • a second resistor 29 is provided at the end of the duct.
  • Duct extensions 30 and 31 d equivalent to extension 12 of the prior embodiment are also provided.
  • FIG. 11 there may be provided two independent ducts 33, 54 forming spaced parts of a single remote suction conduit. There may also be provided more than two ducts in the case of machines having more than two yarn feeds.
  • means for cutting supplementary yarns such as those for sole and a reinforced heel of a stocking
  • This may include a resistor or mechanical cutting system with a pneumatic locking device.
  • a yarn cutting resistor may also be located above the needles 2 to cut the yarn leaving tails 10c and 10d of proper length.
  • a suction pick-up for the yarn will be provided in any case.
  • a circular knitting machine having a rotary needle cylinder; yarn guides lowerable to feed a yarn and raisable to interrupt the feed of the yarn; movable needles slidable in grooves in said cylinder at a stitching location thereof for engaging the yarn to stitch the same into fabric and a stationary cover overlying the cylinder; a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles at said stitching location of the cylinder; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet under suction.
  • a circular knitting machine having a rotary needle cylinder; yarn guides at a plurality of spaced yarn feed positions; movable needles slidable in grooves in said cylinder for engaging the yarns to stitch the same into fabric at spaced stitching locations of the cylinders; a stationary cover overlying the cylinder; a yarn engaging device comprising a plurality of suction ducts each having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles for receiving yarn portions, the inlets being located at respective stitching locations associated with the several feed positions, and a yarn severing device located at the end of each inlet in the direction of rotation of the cylinder.
  • a circular knitting machine having a rotary needle cylinder; yarn guide-s lowerable to feed a yarn and raisable to interrupt the feed of the yarn; movable needles slidable in grooves in said cylinder for engaging the yarn to stitch the same into fabric, and a stationary cover overlying the cylinder; a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet under suction, said inlet being sufficiently long to exceed in angular extent two yarn feed positions for the needles; a battle dividing said inlet into separate openings; and another yarn severing device located at said battle for cutting yarn entering the inlet between said baflle and the other end of said inlet.
  • a circular knitting machine having a rotary needle cylinder; yarn guides lowerable to feed a yarn and raisable to interrupt the feed of the yarn; movable needles slidable in grooves in said cylinder for engaging the yarn to stitch the same into fabric, and a stationary cover overlying the cylinder; a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet under suction, said inlet being sufliciently long to exceed in angular extent two yarn feed positions for the needles; a battle dividing said inlet into separate openings; and another yarn severing device located at said baflle for cutting yarn entering the inlet between said baffle and the other end of said inlet, said duct having a roof portion extended at said baffle and at said one end of the inlet for engaging
  • a circular knitting machine having a rotary needle cylinder; yarn guides lowerable to feed a yarn and raisable to interrupt the feed of the yarn; movable needles slidable in grooves in said cylinder for engaging the yarn to stitch the same into fabric, and a stationary cover overlying the cylinder; a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet under suction, said yarn severing means being an electrical resistance wire effective to sever the yarn when heated.
  • a circular knitting machine having a rotary needle cylinder; yarn guides lowerable to feed a yarn and raisable to interrupt the feed of the yarn; movable needles slidable in grooves in said cylinder for engaging the yarn to stitch the same into fabric, and a stationary cover overlying the cylinder; a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet under suction, said yarn severing means being shears having stationary and movable members; and cam means operatively connected to actuate the shears and operated in coordination with rotation of the cylinder for cutting the yarn at ends of knitting cycles thereof.
  • a yarn engaging device comprising a suction duct having an arcuate open inlet disposed on said cover adjacent a rotary path of movement of the needles; and a yarn severing device located at an end of said inlet in the direction of rotation of the cylinder for cutting a portion of yarn engaged in said inlet undler suction, said inlet being sufiiciently long to exceed in angular extent two yarn feed positions for the needles; a bafile dividing said inlet into separate openings; and another yarn severing device located at said battle for cutting yarn entering the inlet between said bafile and the other end of said inlet; each yarn severing device being an electrical resistance Wire effective to sever

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US792396A 1958-02-14 1959-02-10 Yarn cutting means for knitting machine Expired - Lifetime US3050970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT584420 1958-02-14

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US3050970A true US3050970A (en) 1962-08-28

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US (1) US3050970A (ko)
BE (1) BE575538A (ko)
CH (1) CH375471A (ko)
DE (1) DE1148347B (ko)
ES (1) ES247185A1 (ko)
FR (1) FR1220289A (ko)
GB (1) GB867132A (ko)
NL (1) NL236077A (ko)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120115A (en) * 1959-03-25 1964-02-04 Reymes-Cole Bernard Tho Reymes Means for controlling yarn in knitting machines
US3157036A (en) * 1961-10-18 1964-11-17 Textile Machine Works Yarn severing mechanism for knitting machines
US3191562A (en) * 1962-04-16 1965-06-29 American Safety Table Co Thread trimming device
US3194198A (en) * 1962-12-27 1965-07-13 American Safety Table Co Thread severing mechanism
US3224230A (en) * 1962-03-24 1965-12-21 Sdruzeni Podniku Textilniho St Device for pneumatic holding of inactive yarns in a circular knitting machine
US3257829A (en) * 1961-04-08 1966-06-28 Singer Co Yarn control means for circular knitting machines
US3572059A (en) * 1967-12-16 1971-03-23 Camber Int Uk Ltd Improved multifeed circular knitting machine equipped with pneumatic yarn trappers
US4127075A (en) * 1977-08-25 1978-11-28 Union Special Corporation Suction device for sewing machines
US4674425A (en) * 1985-06-22 1987-06-23 Kochs Adler, Ag Thread-chain separating head for a double chainstitch sewing machine
US5031422A (en) * 1988-04-12 1991-07-16 Sipra Patententwicklungs -U.Beteiligungesellschaft Mbh Method and circular knitting machine for knitting patterned knitwear
US11332857B2 (en) 2016-06-15 2022-05-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Circular knitting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1243321B (de) * 1963-01-28 1967-06-29 Gottlieb Eppinger K G Maschine Strumpfrundstrickmaschine
DE3909817C2 (de) * 1989-03-24 1998-05-20 Sipra Patent Beteiligung Einrichtung zum Ein- und Ausschalten wenigstens eines Funktionsteils einer Strickmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501838A (en) * 1946-10-21 1950-03-28 William H Blizzard Suction cleaning means for loopers
US2602313A (en) * 1951-03-07 1952-07-08 Textile Machine Works Yarn severing device for full-fashioned knitting machines
US2746275A (en) * 1953-03-16 1956-05-22 Beautiful Bryans Inc Yarn severing device for straight-bar knitting machines
US2824436A (en) * 1957-02-27 1958-02-25 Hanes Hosiery Mills Co Yarn clamping and severing mechanism for knitting machines
US2908154A (en) * 1958-03-14 1959-10-13 Burlington Industries Inc Yarn handling and severing mechanism for circular knitting machines and method
US2952148A (en) * 1955-04-20 1960-09-13 Wayne Knitting Mills Lap yarn end cutting attachment for circular knitting machine
US3019628A (en) * 1958-09-19 1962-02-06 Scott & Williams Inc Clamping and cutting means for circular knitting machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE723362C (de) * 1940-06-12 1942-08-03 Seyfert & Donner Fadenfuehrer fuer Strick- oder Wirkmaschinen
US2810280A (en) * 1956-01-25 1957-10-22 Ralph K Rossman Clipping dial for circular knitting machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501838A (en) * 1946-10-21 1950-03-28 William H Blizzard Suction cleaning means for loopers
US2602313A (en) * 1951-03-07 1952-07-08 Textile Machine Works Yarn severing device for full-fashioned knitting machines
US2746275A (en) * 1953-03-16 1956-05-22 Beautiful Bryans Inc Yarn severing device for straight-bar knitting machines
US2952148A (en) * 1955-04-20 1960-09-13 Wayne Knitting Mills Lap yarn end cutting attachment for circular knitting machine
US2824436A (en) * 1957-02-27 1958-02-25 Hanes Hosiery Mills Co Yarn clamping and severing mechanism for knitting machines
US2908154A (en) * 1958-03-14 1959-10-13 Burlington Industries Inc Yarn handling and severing mechanism for circular knitting machines and method
US3019628A (en) * 1958-09-19 1962-02-06 Scott & Williams Inc Clamping and cutting means for circular knitting machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120115A (en) * 1959-03-25 1964-02-04 Reymes-Cole Bernard Tho Reymes Means for controlling yarn in knitting machines
US3257829A (en) * 1961-04-08 1966-06-28 Singer Co Yarn control means for circular knitting machines
US3157036A (en) * 1961-10-18 1964-11-17 Textile Machine Works Yarn severing mechanism for knitting machines
US3224230A (en) * 1962-03-24 1965-12-21 Sdruzeni Podniku Textilniho St Device for pneumatic holding of inactive yarns in a circular knitting machine
US3191562A (en) * 1962-04-16 1965-06-29 American Safety Table Co Thread trimming device
US3194198A (en) * 1962-12-27 1965-07-13 American Safety Table Co Thread severing mechanism
US3572059A (en) * 1967-12-16 1971-03-23 Camber Int Uk Ltd Improved multifeed circular knitting machine equipped with pneumatic yarn trappers
US4127075A (en) * 1977-08-25 1978-11-28 Union Special Corporation Suction device for sewing machines
US4674425A (en) * 1985-06-22 1987-06-23 Kochs Adler, Ag Thread-chain separating head for a double chainstitch sewing machine
US5031422A (en) * 1988-04-12 1991-07-16 Sipra Patententwicklungs -U.Beteiligungesellschaft Mbh Method and circular knitting machine for knitting patterned knitwear
US11332857B2 (en) 2016-06-15 2022-05-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Circular knitting machine

Also Published As

Publication number Publication date
GB867132A (en) 1961-05-03
CH375471A (it) 1964-02-29
ES247185A1 (es) 1959-06-01
NL236077A (ko)
BE575538A (fr) 1959-05-29
FR1220289A (fr) 1960-05-24
DE1148347B (de) 1963-05-09

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