EP0464770A1 - Speziell für elastische Fäden geeigneter Fadenführer in Strickmaschinen zur Herstellung von Socken, Strümpfen o.ä. - Google Patents

Speziell für elastische Fäden geeigneter Fadenführer in Strickmaschinen zur Herstellung von Socken, Strümpfen o.ä. Download PDF

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Publication number
EP0464770A1
EP0464770A1 EP91110946A EP91110946A EP0464770A1 EP 0464770 A1 EP0464770 A1 EP 0464770A1 EP 91110946 A EP91110946 A EP 91110946A EP 91110946 A EP91110946 A EP 91110946A EP 0464770 A1 EP0464770 A1 EP 0464770A1
Authority
EP
European Patent Office
Prior art keywords
thread
supporting plane
rod
thread guide
guide according
Prior art date
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.)
Withdrawn
Application number
EP91110946A
Other languages
English (en)
French (fr)
Inventor
Francesco Lonati
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.)
Lonati SRL
Original Assignee
Lonati SRL
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.)
Filing date
Publication date
Application filed by Lonati SRL filed Critical Lonati SRL
Publication of EP0464770A1 publication Critical patent/EP0464770A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • the present invention relates to an improved thread guide particularly for guiding elastic threads in knitting machines for manufacturing socks, stockings, or the like, and particularly for medium-diameter circular knitting machines such as machines for manufacturing underpants, undershirts, body stockings, etc.
  • a cutter arranged above the needle cylinder and coaxially thereto. More particularly, said cutter is substantially constituted by a disk which is rigidly associated with the needle cylinder in its rotation about its axis, in rotating-cylinder machines, and is peripherally provided with small teeth which engage the thread to be cut when said thread is no longer engaged by the needles.
  • the thread guide or guides which supplied the thread or threads to the needles which knitted said portion are raised so that the subsequent needles can no longer engage said thread which, by being engaged with the last needle, and which in the meantime has retracted into the related groove of the needle cylinder, passes, due to the rotation of the needle cylinder with respect to the thread guides, on the side of the tip of the following needles which is directed toward the axis of the needle cylinder.
  • the thread becomes arranged along a chord above the cutter and is engaged by the teeth thereof which face the inner side of the needle cylinder.
  • a counterblade is arranged downstream of the feed being considered and is constituted by a plate which rests above the cutter in the region of the teeth and cuts the thread when the tooth which has engaged said thread arrives at said plate.
  • a suction nozzle is arranged between the counterblade and the thread feed and is directed toward the upper face of the cutter; by means of a continuous stream of air, the nozzle retains the end of the thread fed by the related thread guide when said thread is cut, in order to prevent it from returning towards the thread guide and to consequently prevent interference with the other threads being fed.
  • the suction nozzle is arranged proximate to the thread feed so as to keep said thread orientated along a direction which is radial with respect to the needle cylinder in order to facilitate the engagement of said thread by the needles when the related thread guide is lowered again, i.e. at the beginning of a new row or knitting portion for which the use of that thread is required.
  • the shortening of the thread can be such as to cause the complete escape of the thread from the related thread guide, thus compulsorily requiring the halting of the machine and the intervention of an operator to restore the correct feed of the thread.
  • Thread cutting and clamping units are used in order to solve this problem; said units are arranged above the cutter and operate alternatively with respect to said cutter when it is necessary to cut an elastic thread. Although they solve the problem of the possible escape of the elastic thread from the related thread guide, said cutting and clamping units have the disadvantage of requiring, for their operation, appropriate actuation elements which must be controlled by a control unit of the machine, generally a microprocessor, making the programming of said machine complicated.
  • the cutting and clamping units are arranged above the cutter, they can also create problems in design, since they cause problems in arranging other elements required for the operation of the machine in this region, which in turn creates problems during maintenance interventions on the machine.
  • the aim of the present invention is to obviate the above described disadvantages by providing an improved thread guide which effectively avoids the escape of the thread when it is cut without requiring the use of thread cutting and clamping units arranged above the cutter.
  • an object of the invention is to provide a thread guide which allows to use the cutter to cut elastic threads as well as normal threads.
  • Another object of the invention is to provide a thread guide which, since it does not require thread cutting and clamping units, simplifies the design of the machine and the programming of the electronic control unit which controls its operation.
  • a further object of the invention is to provide a thread guide which allows to maintain low costs for the elements required for thread feeding.
  • an improved thread guide particularly for elastic threads in knitting machines for manufacturing socks, stockings, or the like which comprises a rod having at least one passage defined therein for a thread, said passage leading out proximate to a longitudinal end of said rod which is arrangeable proximate to a workspace of needles of a knitting machine or the like, characterized in that thread locking means are provided along the path followed by a thread on said rod and can be activated upon a return of a thread fed through said passage.
  • the thread guide according to the invention comprises a rod 2, 2a which is intended to be pivoted, at an intermediate portion 3, 3a thereof, to a supporting structure 4 which is arranged laterally with respect to the needle cylinder 5 of a circular knitting machine for manufacturing socks, stockings, or the like.
  • a passage 8, 8a for a thread 9 to be fed to the needles 7 is defined proximate to the longitudinal end 6, 6a of the rod which is intended to be directed toward the needle cylinder 5 in the workspace of the needles 7.
  • locking means 10, 10a are provided along the path followed by the thread 9 on the rod 2, 2a and are activated when a return of the thread 9 fed through the passage 8, 8a occurs.
  • the rod 2 of the thread guide in its first embodiment has guiding means for the thread 9 which are substantially constituted by channels 11 and 12 defined in the body of the rod 2 and are aligned with respect to the passage 8. Said channels 11 and 12, together with the passage 8, define a sliding path for the thread which is fed through the passage 8.
  • the thread 9 passes above a supporting surface or plane 13 which is arranged directly ahead of the passage 8 along the sliding direction of the thread indicated by the arrow 14.
  • the locking means comprise an element 15 which is pivoted, at its upper end, to a portion 16 of the rod 2 which is arranged above the supporting plane 13.
  • the lower end of the element 15 extends toward the supporting plane 13.
  • the element 15 can oscillate about an axis 17, arranged parallel to and spaced upward with respect to the supporting plane 13 and perpendicular to the sliding direction 14 of the thread 9.
  • the lower end of the element 15 can move toward or away from the supporting plane 13 by oscillating about the axis 17.
  • the oscillation of the element 15 in the opposite direction with respect to the delivery end 6 of the thread guide is limited by the presence of the portion 16, and return means act on the element 15 and bias the oscillation thereof toward the thread delivery end 6.
  • said return means can be conveniently constituted, as in the illustrated case, by a permanent magnet 18 associated with the portion 16 of the rod 2 and orientated toward the element 15.
  • the lower end of the element 15 has, on the opposite side with respect to the end 6, a level or chamfer 19 which forms an acute angle with respect to the sliding direction 14 of the thread on the supporting plane 13.
  • Said magnet 18 can be replaced with a simple return spring which is not illustrated for the sake of simplicity.
  • channels 11a and 12a and a supporting plane 13a are defined in the rod 2a similarly to what has already been described with reference to the first embodiment.
  • the locking means comprise an elastically flexible lamina 15a which is fixed, at its upper end, to a portion 16a of the rod 2a, arranged above the supporting plane 13a and upstream of the supporting plane 13a along the sliding direction 14 of the thread 9.
  • the lower end of the lamina 15a rests on the plane 13a, forming an acute angle with respect to the sliding direction 14 of the thread 9.
  • the thread guide according to the invention can be adopted in replacement of conventional thread guides and can be actuated in the same way as conventional thread guides, for example by means of electromagnetic actuators 20 and springs 21.
  • the thread guide according to the invention fully achieves the intended aim, since it avoids the use of the cutting and clamping units used so far for elastic threads, while effectively preventing the escape of the thread from the thread guide.
  • the materials employed, as well as the dimensions, may be any according to the requirements and to the state of the art.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Knitting Of Fabric (AREA)
EP91110946A 1990-07-06 1991-07-02 Speziell für elastische Fäden geeigneter Fadenführer in Strickmaschinen zur Herstellung von Socken, Strümpfen o.ä. Withdrawn EP0464770A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT02087990A IT1244294B (it) 1990-07-06 1990-07-06 Guidafilo perfezionato particolarmente per fili elastici in macchine per maglieria calzetteria o simili
IT2087990 1990-07-06

Publications (1)

Publication Number Publication Date
EP0464770A1 true EP0464770A1 (de) 1992-01-08

Family

ID=11173452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110946A Withdrawn EP0464770A1 (de) 1990-07-06 1991-07-02 Speziell für elastische Fäden geeigneter Fadenführer in Strickmaschinen zur Herstellung von Socken, Strümpfen o.ä.

Country Status (4)

Country Link
EP (1) EP0464770A1 (de)
JP (1) JPH04241152A (de)
CS (1) CS207091A3 (de)
IT (1) IT1244294B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782098A1 (fr) * 1998-08-06 2000-02-11 Dim Sa Dispositif de maintien de fil pour machine textile notamment pour metier a tricoter
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
CN103320957A (zh) * 2013-07-09 2013-09-25 经纬纺织机械股份有限公司 用于电脑横机的夹子剪刀

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040022A1 (de) * 1969-08-14 1971-03-04 Billi Spa System zur Zufuehrung eines elastisch gestreckten Fadens in einer Strickmaschine,insbesondere fuer Struempfe
GB1385103A (en) * 1971-06-02 1975-02-26 Elitex Zavody Textilniho Braking of fed yarn
GB1553051A (en) * 1976-10-13 1979-09-19 Lonati F Single cylinder circular knitting machine
CH650815A5 (de) * 1980-06-23 1985-08-15 Textima Veb K Fadenklemmvorrichtung fuer strickmaschine.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS506855A (de) * 1973-05-24 1975-01-24
JPS58139996A (ja) * 1982-02-09 1983-08-19 建守　邦雄 作業用器具
JPS6019596A (ja) * 1983-07-13 1985-01-31 富士ゼロックス株式会社 ミシン目加工紙

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040022A1 (de) * 1969-08-14 1971-03-04 Billi Spa System zur Zufuehrung eines elastisch gestreckten Fadens in einer Strickmaschine,insbesondere fuer Struempfe
GB1385103A (en) * 1971-06-02 1975-02-26 Elitex Zavody Textilniho Braking of fed yarn
GB1553051A (en) * 1976-10-13 1979-09-19 Lonati F Single cylinder circular knitting machine
CH650815A5 (de) * 1980-06-23 1985-08-15 Textima Veb K Fadenklemmvorrichtung fuer strickmaschine.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2782098A1 (fr) * 1998-08-06 2000-02-11 Dim Sa Dispositif de maintien de fil pour machine textile notamment pour metier a tricoter
CN103320957A (zh) * 2013-07-09 2013-09-25 经纬纺织机械股份有限公司 用于电脑横机的夹子剪刀

Also Published As

Publication number Publication date
JPH04241152A (ja) 1992-08-28
CS207091A3 (en) 1992-01-15
IT9020879A0 (it) 1990-07-06
IT1244294B (it) 1994-07-08
IT9020879A1 (it) 1992-01-06

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