US3803878A - Yarn cutter for circular knitting machines - Google Patents

Yarn cutter for circular knitting machines Download PDF

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Publication number
US3803878A
US3803878A US00235902A US23590272A US3803878A US 3803878 A US3803878 A US 3803878A US 00235902 A US00235902 A US 00235902A US 23590272 A US23590272 A US 23590272A US 3803878 A US3803878 A US 3803878A
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Prior art keywords
yarn
elements
strip
retaining
knitting machines
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Expired - Lifetime
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US00235902A
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English (en)
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F Lonati
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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

Definitions

  • ABSTRACT A yarn cutter for circular knitting machines, particularly for yarn changers of double cylinder knitting machines, comprising at least one scissor member consisting of a striplike element mounted to slide backwards and forwards adjacent to a fixed blade. Pressed against the striplike element on the side opposite that adjacent the fixed blade, is a body of elastically yieldablc material such as plastic material. This body occupies at least part of the width of the striplike element for the retention therebetween of the yarn or yarns after the cutting thereof. Means are also provided for adjusting the pressure of the elastic body on the striplike element.
  • the present invention relates to a yarn cutter for circular knitting machines, particularly adapted for attachment to yarn changers of double cylinder knitting machines.
  • a yarn carrier When a yarn carrier is disconnected from the manufacturing process, it is brought into the rest position and simultaneously the yarn stretched between the last needle which has taken said yarn and the corresponding yarn carrier is cut by a yarn cutter comprising a mobile driven metal blade which after cutting the yarn in co-operation with a metal counter blade, retainsit;
  • An object of the present invention is to largely obviatethe aforementioned disadvantages relative to known devices, by providing a yarn" cutter of rational conception, excellent operation and easy adjustment, by means of which the retention of yarns of different type or count, either single or'combined, is assured.
  • Another important object of the invention is to provide a yarn cutter in which the necessary periodical sharpening operations are simplified.
  • Another object of the invention is to provide a yarn cutter of easy construction and low cost.
  • the yarn cutter for circular knitting machines comprising at least one scissor member consisting of a striplike element mounted to slide backwards and forwards in the direction of its own length adjacent to a fixed blade and characterized in that a body of elastically yieldable material such as plastic material or the like is disposed pressed to said striplike element on the side opposite that adjacent to said fixed blade, and occupying at least part of the width of said striplike element, for the retention between this latter and said body of the yarn or yarns immediately after their cutting, means being provided for adjusting the pressure of said body on said striplike, element.
  • FIGS. 1 and 2 are perspective views of the yarn cutter according to the invention, seen from two opposite sides respectively;
  • FIG. 3 is a perspective view ofa detail of the same device
  • FIG. 4 is a vertical section through the device with a scissor member in the open position
  • FIG. 5 is a vertical section through the device with all scissor members in the closed position.
  • the yarn cutter according to the invention (by the term yarn. cutter is meant a device which in addition to cutting also provides for retaining the yarns as the changes are made) comprises a support structure 1 which extends upwards in the .form of a plate la which is fixed in an inclined position near the two cylinders 1b (FIG. 1) of the knitting machine and near a yarn changer (not shown) provided to the left of said yarn cutter, with reference to FIG. 1.
  • scissor members (six in the example shown) are associated with the plate body la, each of them comprising a striplike element 2 mounted to slide backwards and forwards in the direction of its own length and terminating upwards with a hook portion 2a.
  • the striplike elements 2 are mounted parallel one to the other in corresponding guide grooves and are adjacent to a stationary plate element defining a single blade 3 fixed to the internal side of the plate body la by means of screws which pass through slots 3a which allow the height of the blade to be adjusted.
  • the cutting edge 3b of the blade is-to the top, slightly below the extremities of the hook portions 2a of the striplike elements 2 when these are in the rest position. By this arrangernent, the cutting edge 3b of the blade 3 cuts the yarns after they have been hooked by the hook portions 2a and pulled down by them.
  • a yarn retaining block 4 of elastically yieldable material is provided, preferably of the material commonly known as nylon or a like material, said block being pressed towards the striplike element 2 by a corresponding flat metal spring 5 embedded at its lower end into the plate body la, its elastic force being adjustable by means of a screw 6 which, after adjustment, is locked by another screw 7 disposed perpendicularly to screw 6.
  • six blocks 4 are provided disposed one beside the other in a quadrangular space formed at the top of the plate body 1a.
  • each of them is provided with a recess 8 into which the projecting end 9 of a lever 10 pivoted at 11 to the fixed structure 1 engages.
  • Each lever 10 is moved by a Bowden wire whose cable is fixed to the lever and passes through slots 13 in a shaped plate member 14 rigid with the fixed part 1, and its corresponding sheath 16 is fixed to said plate member 14.
  • the levers 10 are moved against the reaction of corresponding springs 15 which tend to keep the extremities 9 of said levers 10 lowered so that normally the striplike elements 2 are disposed in the lowered position with their hook portions 2a close to the sharpened edge 3b of the blade 3.
  • a wire-like member 17 of arched shape disposed transversly and projecting for guiding the yarns during the stage immediately preceding their cutting.
  • a further wire-like member 18 which stops the machine should the yarn not be cut.
  • the yarn which has not been cut is taken by the hook portion of member 18 and resiliently displaces this member 18 which acts on a microswitch (not shown) which stops current supply to the machine.
  • Theyarn cutter according to the invention operates in the following manner.
  • the device comes into operation when yarns are to be changed, i.e., when the yarn carriers (not shown) of the yarn changer move, by known mechanisms, from a rest position to a working position and vice versa, so as to feed certain yarns to the knitting machine and exclude others.
  • a very efficient retention action is set up on the yarn by its location between a metal member (2) and a member of yieldable plastic material (4), as excellent adherence is obtained due to a partial defonnation of the block 4.
  • the disposition according to the invention is particularly advantageous when two yarns of different type or different count have to be cut and retained simultaneously.
  • the partial deformability of the block 4 of plastic material assures the simultaneous retention of two or even more yarns, independently of their characteristics.
  • the yarn of smaller diameter does not escape as frequently happens with traditional devices, because the elasticity of the material which constitutes the blocks 4 assures excellent adaptability and adherence even in the case of very different yarn diameters.
  • a further advantage of the device according to the invention is the possibility of adjusting the pressure of each block 4 on its corresponding striplike element 2 independently of the other blocks, by adjusting the screws 6. In this manner different pressures can be set up according to the various characteristics of the yarn to be retained at one or another of the scissor members.
  • the screws 7 lock the screws 6 after their adjustment so as to prevent any loosening due to vibrations during use.
  • the wire-like member 18 serves for automatically stopping the machine (by closing a contact which inserts a relay) should the yarn not be cut because the hook portions 20 do not rise, or for other reasons.
  • the thread cutter according to the invention is easily sharpened by a single operation on the edge 3b of the blade 3, which can be carried out after disassembling it.
  • the yarn cutter according to the invention is of reliable operation, and eliminates the danger of the yams escaping on changing, with consequent reduction in the quantity of manufactured articles which have to be rejected.
  • the device according to the invention is particularly advantageous for the production of plated knitwear.
  • the device according to the invention is appicable to all circular knitting machines, of one or two cylinders and one or more foods.
  • a yarn cutting and retaining device for circular knitting machines comprising in combination a fixed support structure arranged adjacent the needle cylinders, a plurality of elongated strip-like elements arranged adjacent to each other and each having a hooked end for taking a yarn, said strip-like elements being slidable inside said support structure along their own length and defining a plurality of movable cutting blades, a stationary plate element arranged contacting all of said striplike elements at one face thereof and having a sharpened edge extending transverse to said strip-like elements for defining therewith a plurality of independently operating cutting units, a plurality of yarn retaining blocks of yieldable plastic material each associated to one of said strip-like elements at the face thereof opposite to said stationary plate element, said retaining blocks having a width provided for simultaneously retaining more than one yarn, spring means each having one end engaging one of said yarn retaining blocks for pressing it against the corresponding strip-like element, adjusting screws arranged within said support structure and acting on said spring means for adjusting the elastic force thereof

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00235902A 1971-04-08 1972-03-20 Yarn cutter for circular knitting machines Expired - Lifetime US3803878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2289471 1971-04-08

Publications (1)

Publication Number Publication Date
US3803878A true US3803878A (en) 1974-04-16

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ID=11201618

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Application Number Title Priority Date Filing Date
US00235902A Expired - Lifetime US3803878A (en) 1971-04-08 1972-03-20 Yarn cutter for circular knitting machines

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US (1) US3803878A (oth)
CS (1) CS167977B2 (oth)
DE (1) DE2216502A1 (oth)
FR (1) FR2131657A5 (oth)
GB (1) GB1382304A (oth)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919862A (en) * 1973-02-09 1975-11-18 Bentley Eng Co Ltd Separating tubular knitted articles
US4099392A (en) * 1976-06-21 1978-07-11 Francesco Lonati Yarn cutting and gripping device for a circular knitting machine
US5347832A (en) * 1993-11-24 1994-09-20 Richard Copenhaver Yarn binder apparatus
US6122939A (en) * 1998-03-16 2000-09-26 Lonati S.P.A. Process and apparatus for reducing the lead-in thread length in circular knitting machines
US6189345B1 (en) * 1999-06-11 2001-02-20 Sangiacomo S.P.A. Yarn-locking/cutting device for circular stocking knitting and knitting machines
US20050066692A1 (en) * 2001-12-21 2005-03-31 Francesco Lonati Thread gripping device, particularly for gripping elastic threads having a small cross-section, in circular knitting machines for hosiery or the like
US20050076681A1 (en) * 2001-12-21 2005-04-14 Francesco Lonati Thread gripping device in circular knitting machines for hosiery or the like
CN102787434A (zh) * 2012-09-04 2012-11-21 宁波慈星股份有限公司 针织横机中的剪刀夹子装置
US20160130735A1 (en) * 2013-06-21 2016-05-12 Santoni S.P.A. Device for feeding thread to needles of a knitting machine
CN112609313A (zh) * 2020-12-08 2021-04-06 福建华峰新材料有限公司 纬圆机加减换纱嘴的调机工艺
US11528916B2 (en) * 2019-02-12 2022-12-20 Marel A/S Cutting apparatus with element for receiving and abutting cutting blade

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US778164A (en) * 1903-08-25 1904-12-20 William T Barratt Striping attachment for circular-knitting machines.
US2245205A (en) * 1941-06-10 Varn binder for knitting machines
US2252214A (en) * 1939-05-24 1941-08-12 Hemphill Co Feeding means for knitting machines
US2304916A (en) * 1941-02-11 1942-12-15 Interwoven Stocking Co Circular knitting machine
US3552149A (en) * 1968-04-19 1971-01-05 Francesco Lonati Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2245205A (en) * 1941-06-10 Varn binder for knitting machines
US778164A (en) * 1903-08-25 1904-12-20 William T Barratt Striping attachment for circular-knitting machines.
US2252214A (en) * 1939-05-24 1941-08-12 Hemphill Co Feeding means for knitting machines
US2304916A (en) * 1941-02-11 1942-12-15 Interwoven Stocking Co Circular knitting machine
US3552149A (en) * 1968-04-19 1971-01-05 Francesco Lonati Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919862A (en) * 1973-02-09 1975-11-18 Bentley Eng Co Ltd Separating tubular knitted articles
US4099392A (en) * 1976-06-21 1978-07-11 Francesco Lonati Yarn cutting and gripping device for a circular knitting machine
US5347832A (en) * 1993-11-24 1994-09-20 Richard Copenhaver Yarn binder apparatus
US6122939A (en) * 1998-03-16 2000-09-26 Lonati S.P.A. Process and apparatus for reducing the lead-in thread length in circular knitting machines
US6189345B1 (en) * 1999-06-11 2001-02-20 Sangiacomo S.P.A. Yarn-locking/cutting device for circular stocking knitting and knitting machines
US20050076681A1 (en) * 2001-12-21 2005-04-14 Francesco Lonati Thread gripping device in circular knitting machines for hosiery or the like
US20050066692A1 (en) * 2001-12-21 2005-03-31 Francesco Lonati Thread gripping device, particularly for gripping elastic threads having a small cross-section, in circular knitting machines for hosiery or the like
US6920768B2 (en) * 2001-12-21 2005-07-26 Santoni S.P.A. Thread gripping device in circular knitting machines for hosiery or the like
US7032414B2 (en) * 2001-12-21 2006-04-25 Santoni S.P.A. Thread gripping device, particularly for gripping elastic threads having a small cross-section, in circular knitting machines for hosiery or the like
CN102787434A (zh) * 2012-09-04 2012-11-21 宁波慈星股份有限公司 针织横机中的剪刀夹子装置
CN102787434B (zh) * 2012-09-04 2014-01-15 宁波慈星股份有限公司 针织横机中的剪刀夹子装置
US20160130735A1 (en) * 2013-06-21 2016-05-12 Santoni S.P.A. Device for feeding thread to needles of a knitting machine
US10472749B2 (en) * 2013-06-21 2019-11-12 Santoni S.P.A. Device for feeding thread to needles of a knitting machine
US11528916B2 (en) * 2019-02-12 2022-12-20 Marel A/S Cutting apparatus with element for receiving and abutting cutting blade
CN112609313A (zh) * 2020-12-08 2021-04-06 福建华峰新材料有限公司 纬圆机加减换纱嘴的调机工艺

Also Published As

Publication number Publication date
CS167977B2 (oth) 1976-05-28
FR2131657A5 (oth) 1972-11-10
DE2216502A1 (de) 1972-10-12
GB1382304A (en) 1975-01-29

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