US3552149A - Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines - Google Patents

Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines Download PDF

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Publication number
US3552149A
US3552149A US815574A US3552149DA US3552149A US 3552149 A US3552149 A US 3552149A US 815574 A US815574 A US 815574A US 3552149D A US3552149D A US 3552149DA US 3552149 A US3552149 A US 3552149A
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Prior art keywords
thread
cutting
shears
displacement
knitting machines
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Expired - Lifetime
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US815574A
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English (en)
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Francesco 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

  • This disclosure relates to a device for the displacement of thread end portions adjacent the cutting and gripping members of double cylinder knitting machines, .said .device comprising a substantially rectilinearwire-like element for the displacement of the thread end portions during the opening of said cutting and gripping members and arranged to extend transversally adjacent the upper end of the latter, a support carrying said wire-like member and mounted for to-and-fro movement on the fixed structure of said cutting and gripping members, and a transverse arm mounted on said supportand arranged to displace the mobile blades of said cutting and gripping members.
  • the present invention relates to a device designed to displace thread end portions adjacent units for cutting and gripping the threads for thread feeding units of double cylinder knitting machines.
  • the thread feeding units that is comprising a plurality of different threads, to be worked according to predetermined successions, are associated to suitable devices for cutting and gripping the threads.
  • Such devices have to-be associated to suction and blowing means designed to suitably displace the end portions of the threadstoward the cy'lin der during the opening phase of the cutting and gripping means so as to avoid the said thread portions from being once again grippedduring the closure'phase of the shears.
  • the end portions of the threads tend to be gripped once again by'the closing shears withconse'quent breakage and wastage of thread which does not allow the successive gripping thereof.
  • suction and blowing'means resolve said problem but they have the disadvantage of requiring the installation of suitable fans or-pipes which leads to an appreciable increase in'the overall costs of the double cylinder knitting arranged on the left-hand side of the cutting members viewing the knitting machine from outside.
  • Another important objectv of the invention is that of providing a device torbe associated'to the thread cutting and gripping units of circular knitting machines which is of simple manufacture and relatively modest cost.
  • FIGS. 1 and 2 show perspective views, from opposite sides, of a thread cutting and gripping mechanism on which there is applied the device according to the invention
  • FIG. 3 is a side view of the same device in the closure osition of the shears
  • FIG. 4 is a side view taken from the opposite side to that of FIG. 3 with all the shears in the closure position;
  • FIG. 5 is a side view analogous to that of FIG. 4, in which one shear is in the open position;
  • FIGS. 6a, 6b, 6c, 6d, 6e and 6f diagrammatically show, in plan view, the thread displacement device according to the invention. in the respective work positions.
  • the device according to the invention is-applied to thread cutting and gripping mechanism of known type comprising a fixed structure 1 which as an upward plate-like extension 1a which is fixed in inclined position adjacent the two cylinders 2 and 3 of the knitting machine adjacent a feeding unit.
  • the feeding' is provided on the left-hand side of the cutting and gripping mechanism, viewing the machine from the outside.
  • said mechanism comprises a plurality of shears (in the illustrated embodiment six in number) arranged on the lower side of the plate-like body 1a.
  • Each of such shears comprises a mobile, leaf blade 4 slidably mounted for longitudinal sliding between a fixed blade 5 and a common fixed stop member 5a formed by the upper end portion of the platelike body 1 which is suitably rounded.
  • Each mobile blade 4 is upwardly displaced due to the engagement of an end 6a of a respective lever 6 fulcrumed in 6b on the fixed structure 1.
  • Each lever 6 may be displaced by means of a relative tie-rod 7 against the action of a relative spring 8.
  • the displacement device for the thread end portions comprises an extended plate 9 which is laterally mounted on the fixed structure 1 and supports, at its upper end, a wire-like member 10 arranged transversally offset with rectilinear development. Adjacent said member 10 there is arranged another wirelike member 11 of arcuate shape which is secured to the upper portion of the plate-like body 1a.
  • Said plate 9 is provided with a lower slot 9a which extends substantially parallel to the length of said plate, and an upper slot 9b which is inclined.
  • the shanks of two screws 12 are inserted in said slots and are screwed to the plate-like body In but allow, however, the to-andfro movement of the plate 9.
  • the plate 9 At its lower end the plate 9 is fast with a transverse arm 13 arranged orthogonally offset so as to engage the end portions 6a of the levers 6. With such arrangement, when any of the levers 6 is displaced due to traction exercised by the relative tie-rod 7, the plate 9 rises together with the mobile blade 4 concerned. During its maximum upward phase, shown in FIG. 5, the plate 9 has its upper portion displaced backwards due to the inclined slot 91), so that the wire-like member 10 is also displaced backwards.
  • a spring 14 which has one end secured to the structure 1 and the other end secured to said plate 9 adjacent the transverse arm 13.
  • FIGS. 6a to 6 there are shown the threads arriving from the feeding unit and passing adjacent the device according to the invention.
  • the threads 15, 16 and 17 are shown in continuous lines and the other threads 18, 19 and 20 are shown with dotted lines (FIG. 6a).
  • the thread-holders 15a, 16a and 17a of the threads 15, 16 and 17 and the thread-holders 18a, 19a and 20a of the threads 18, 19 and 20' are shown in similar manner.
  • the thread-holders displace, under the action of known mechanisms (not shown), from a rest position to a work position and vice-versa so as to bring into operation the desired threads and exclude the other threads.
  • the working of the displacement device for the thread end portions according to the invention is as follows. (In order to better clarify the working of the device, the working of the cutting and gripping mechanism is also described).
  • the mobile blade 4 (shown with dotted lines in FIG. 62). is caused to rise by the relative shears so that the thread 15 proceeding from the fabric being manufactured passes adjacent such mobile blade to be cut in the subsequent closure phase.
  • the thread 15 leaving the working passes under both the wire-like members 10 and 11 since the member 10 is raised due to the fact that the opening of the shears relative to said thread 15 has taken place.
  • the thread 16 proceeds to form the fabric, passing in the thread-holder 16a which is in the work position.
  • the thread-holder 17a will be displaced towards the work position indicated with dotted lines in FIG. 6 Also in this case the thread 17 gripped by the relative shears will pass below the curved member 11 and above the rectilinear member 10 and becomes looped. Immediately afterwards the shears realtive to the thread 17 will open with the consequent raising of the wire-like rectilinear member 10 which displaces the end of the thread 17 upwards. Then the shears of the thread 17 reclose (remaining empty) while the thread 17 goes to form the fabric, The thread 16 will then be removed from working by means of the displacement of the thread 16 towards the right with successions of phases completely analogous to be described above.
  • the simple arrangement of the wirelike rectilinear member 10, which is mobile in synchronism with the movement of any one of the mobile blades 4, ensures the forwarding of the end portions of all the threads of the feeding unit from the shears, thus rendering the application of suction and blowing members useless.
  • a device for the displacement of thread end portions adjacent the thread cutting and gripping members for thread feeding units of double cylinder knitting machines in which the feed is arranged on the left-hand side of the cutting and gripping members, said cutting and gripping members comprising a fixed bearing structure thereof, a plurality of side-by-side shears, each of which comprises a mobile blade mounted for longitudinal sliding between a fixed blade and a fixed stop member having a rounded edge for retaining the end portions of the threads during the closure of said shears, said device being characterized in that it comprises a substantially rectilinear wire-like member for the displacement of the end portions of the threads during the opening phase of said shears and arranged transversally adjacent the upper portions of said shears, a support carrying said wire-like member and mounted for to-and-fro movement on said fixed bearing structure of said cutting and gripping members upon displacement of the mobile blades of said shears, said support having a transverse arm which is arranged to engage contol levers connected to said mobile blades.
  • a device characterized in that said support comprises an elongate plate mounted at the side of said fixed structure substantially parallel to said blades and having slots arranged to receive the shanks of securing means for securing said elongate plate to said fixed structure, said elongate plate being fast with said transverse arm, resilient return means being provided for the return of said elongate plate to the rest position.
  • a device characterized in that it comprises means for causing a displacement of said transverse arm in a direction away from said needle cylinders during the opening phase of said shears.
  • a device characterized in that said support comprises an elongate plate provided with a lower slot which extends substantially longitudinally and an upper inclined slot, said slots being arranged to engage respective pins fast with said fixed structure, said upper slot causing said backwards displacement of said transverse member.
  • a device characterized in that, during the displacement of a thread-holder towards the Work position, the relative thread is arranged below a curved transverse member fast with said fixed structure and above said wire-like member.
  • a device characterized in that during the displacement of a thread-holder from the work position to the rest position, the relative thread passes below both a transverse curved member fast with said fixed structure and said Wire-like member, said wire-like member being correspondingly in the raised position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Treatment Of Fiber Materials (AREA)
US815574A 1968-04-19 1969-04-14 Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines Expired - Lifetime US3552149A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1549168 1968-04-19

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US3552149A true US3552149A (en) 1971-01-05

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US815574A Expired - Lifetime US3552149A (en) 1968-04-19 1969-04-14 Thread displacement device for use with cutting and gripping units of duble cylinder knitting machines

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US (1) US3552149A (cs)
CS (1) CS150251B2 (cs)
DE (1) DE1919531A1 (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803878A (en) * 1971-04-08 1974-04-16 F Lonati Yarn cutter for circular knitting machines
DE2844903A1 (de) * 1977-10-21 1979-04-26 Lonati Cost Mecc Steuereinrichtung fuer fadenzufuehr- und wechselvorrichtungen bei rundstrickmaschinen, insbesondere doppelzylinder- strumpfrundstrickmaschinen
US6810694B2 (en) 2003-03-05 2004-11-02 Sara Lee Corporation Method of knitting an elastomeric yarn into a circularly knitted fabric
US20160130735A1 (en) * 2013-06-21 2016-05-12 Santoni S.P.A. Device for feeding thread to needles of a knitting machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803878A (en) * 1971-04-08 1974-04-16 F Lonati Yarn cutter for circular knitting machines
DE2844903A1 (de) * 1977-10-21 1979-04-26 Lonati Cost Mecc Steuereinrichtung fuer fadenzufuehr- und wechselvorrichtungen bei rundstrickmaschinen, insbesondere doppelzylinder- strumpfrundstrickmaschinen
US4233826A (en) * 1977-10-21 1980-11-18 Construzioni Meccaniche Lonati S.P.A. Control device for striper units in circular knitting machines
US6810694B2 (en) 2003-03-05 2004-11-02 Sara Lee Corporation Method of knitting an elastomeric yarn into a circularly knitted fabric
US20050076682A1 (en) * 2003-03-05 2005-04-14 Sara Lee Corporation Method of knitting an elastomeric yarn into a circularly knitted fabric
US6901776B2 (en) 2003-03-05 2005-06-07 Sara Lee Corporation Method of knitting an elastomeric yarn into a circularly knitted fabric
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

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Publication number Publication date
DE1919531A1 (de) 1969-10-30
CS150251B2 (cs) 1973-09-04

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