EP0567880A2 - Métier à tricoter circulaire pour la fabrication de bas, chaussettes et pareils pourvu d'un système à came de tricotage amélioré - Google Patents

Métier à tricoter circulaire pour la fabrication de bas, chaussettes et pareils pourvu d'un système à came de tricotage amélioré Download PDF

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Publication number
EP0567880A2
EP0567880A2 EP93106294A EP93106294A EP0567880A2 EP 0567880 A2 EP0567880 A2 EP 0567880A2 EP 93106294 A EP93106294 A EP 93106294A EP 93106294 A EP93106294 A EP 93106294A EP 0567880 A2 EP0567880 A2 EP 0567880A2
Authority
EP
European Patent Office
Prior art keywords
slider
countercam
knitting
needle cylinder
forming cam
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Withdrawn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
EP93106294A
Other languages
German (de)
English (en)
Other versions
EP0567880A3 (en
Inventor
Francesco Lonati
Ettore Lonati
Fausto Lonati
Tiberio 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 SpA
Original Assignee
Lonati SpA
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 SpA, Lonati SRL filed Critical Lonati SpA
Publication of EP0567880A2 publication Critical patent/EP0567880A2/fr
Publication of EP0567880A3 publication Critical patent/EP0567880A3/en
Withdrawn legal-status Critical Current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
    • D04B15/32—Cam systems or assemblies for operating knitting instruments

Definitions

  • the present invention relates to a circular knitting machine for manufacturing socks, stockings or the like, with an improved knitting forming cam set.
  • the cams have ascending and descending portions which, when the needle cylinder is rotatably actuated about its own axis with respect to the cams, produce a reciprocating movement of the needles which engage said cams, this movement leading to the forming of the loops of knitting.
  • each feed or drop of the machine there is at least one cam with an ascending portion which raises the needles in order to move them so that they take up the thread dispensed by appropriate thread guides located proximate to the upper end of the needle cylinder.
  • a cam Directly after the feed or drop there is a cam with a descending portion which lowers the needles, causing the forming of a new loop which is linked to the previously formed loop, released by the needle.
  • one set of needles must take up the thread dispensed at one feed, while another set of needles is kept inactive at the same feed.
  • the needles which must knit at the feed being considered are moved, by means of sub-needles actuated by appropriate selection devices, so that their heel is at such a level as to engage the ascending portion of the cam located upstream of the feed, whereas the needles which must not knit are retained or moved so that their heel passes below said cam.
  • the sub-needles cause the transfer of the heels of the needles from one path to another among the various paths defined by the cams which are located around the needle cylinder.
  • the cam which is located immediately after a drop or feed of the machine and causes the lowering of the needles is termed "knitting forming cam", since this cam, by causing the lowering of the needles which have taken up the thread at the drop or feed, causes the forming of the new loops of knitting.
  • Said knitting forming cam is generally vaguely shaped like a triangle with the base directed upward, so as to have a lower profile with a descending portion located immediately after the feed proximate to which it is arranged.
  • the knitting forming cam and the associated countercam are fixed to a same block which can be moved parallel to the axis of the needle cylinder so as to allow to vary the extent of the lowering of the needles after thread takeup and thus to vary the length of the loops, i.e. the tightness of the knitting.
  • the needles which do not knit at a feed are not raised upstream of said feed, but their heel is kept at such a level as to pass between the knitting forming cam and the associated countercam.
  • the needles which do not knit at a feed arrive so that their heel is below the passage defined between the knitting forming cam and the countercam, colliding against the profile of the countercam, which is specifically filleted to convey the heel of these needles through said passage.
  • the presence of the countercam is superfluous for delimiting the lowering imparted to the needles, since two-heel needles are used; these needles engage both the upper profile and the lower profile of the knitting forming cam and are thus guided directly by the knitting forming cam both in their ascending and descending movements.
  • a typical example of knitting of this type is the knitting of highly elastic threads, such as for example threads commercially known by the trade mark LYCRA.
  • the aim of the present invention is to solve the above problem by providing a circular knitting machine with an improved knitting forming cam set which permits the machine to operate, without drawbacks, at speeds which are significantly higher than the operating speeds of known machines.
  • an object of the present invention is to provide a machine wherein collision is avoided between the heels of the needles which do not knit at a feed or drop and the countercam of the knitting forming cam arranged proximate to said feed.
  • Another object of the present invention is to provide a machine with an improved knitting forming cam set without producing bulk problems and without preventing the possibility of adjusting the density of the knitting.
  • a circular knitting machine for manufacturing socks, stockings or the like, with improved knitting forming cam set, comprising a needle cylinder rotatable about a substantially vertical needle cylinder axis; a plurality of axial grooves defined on the lateral surface of said needle cylinder, each one of said axial grooves accommodating a needle which is slidable along a direction parallel to the needle cylinder axis; said needle having at least one heel protruding radially from the needle cylinder and being engageable with cams which laterally face the needle cylinder and define paths engageable by the heels of the needles during the rotation of the needle cylinder about said axis with respect to said cams; said cams comprising, proximate to at least one thread feed, a knitting forming cam provided with a lower profile defining a descending portion immediately after the feed of the thread which can engage the heel of the needles which are raised to take up the thread to lower them so as to form the loops of knitting
  • the machine comprises, in a manner known per se, a needle cylinder 1 which is rotatably actuatable about its own vertically arranged axis 1a, and has a plurality of axial grooves 2 on its lateral surface.
  • a needle 3 is slidably arranged inside each groove 2 and is provided with at least one heel 3a which protrudes radially from the needle cylinder 1 to engage within paths defined by cams 4 arranged around the needle cylinder.
  • Said knitting forming cam 6 is vaguely shaped like an inverted triangle and defines, with its lower profile, a descending portion 7 arranged immediately after the feed 5 along the direction of the movement of the needles during rotation of the needle cylinder 1 with respect to the cams.
  • the descending portion 7 causes, in a known manner, a lowering of the needles which have taken up the thread at the feed 5 so that they form new loops of knitting linked to the previously formed loops which are released by the needles.
  • a countercam 8 Proximate to the end of the descending portion 7 there is a countercam 8 which faces the lower vertex of the knitting forming cam 6. Said countercam 8 delimits the lowering of the needles which have taken up the thread at the feed 5 and, between the knitting forming cam 6 and the countercam 8, there is a passage through which both the needles which have taken up the thread at the feed 5 and the needles which have been excluded from knitting at said feed pass.
  • the countercam 8 is slidably supported along a sliding direction 9 which is parallel to the axis 1a of the needle cylinder, with respect to the knitting forming cam 6, and there are means for actuating the countercam 8 activable by control to move the countercam 8 along the direction 9 toward or away from the knitting forming cam 6.
  • both the knitting forming cam 6 and the countercam 8 can slide rigidly together, by control, along the sliding direction 9 to vary the extent of the descent of the needles which have knitted at the feed 5 and thus to vary the tightness of the knitting.
  • the knitting forming cam 6 and the countercam 8 are mounted on a block 10 fixed to the supporting structure 11 of the machine laterally to the needle cylinder 1.
  • the block 10 has a base 12 from which two shoulders 13 and 14 and an upright 15 rise; the shoulders are parallel to the axis 1a and are mutually opposite, whereas the upright is arranged transversely to the shoulders 13 and 14.
  • the two shoulders 13 and 14, together with the upright 15, define a sliding seat which is open upwardly and towards the needle cylinder 1 and in which a first slider 16 is inserted; said slider protrudes from the shoulders 13 and 14 towards the needle cylinder 1 with a portion 16a to which the knitting forming cam 6 is fixed.
  • the first slider 16 can slide parallel to the axis 1a along the shoulders 13 and 14 and along the upright 15, to which it is coupled by means of a pivot 17 passing through a slot 18 defined in said upright and elongated in a direction which is parallel to the axis 1a to allow the sliding of the slider 16.
  • first slider 16 there is a sliding seat 19 which is open upwardly and in which a second slider 20 is slidably inserted parallel to the axis 1a; said second slider is provided with a portion 20a protruding from the seat 19 toward the needle cylinder 1 below the portion 16a of the first slider 16.
  • the countercam 8 is fixed to the portion 20a of the second slider 20.
  • the means for actuating the countercam 8 advantageously comprise a first fluid-dynamic actuator, for example a pneumatic cylinder 21, which is mounted on the base 12 of the block 10 and acts on the end of a lever 22 which is pivoted, with an intermediate portion, to the first slider 16 and faces, with its other end, the upper end of the second slider 20.
  • the action performed by the pneumatic cylinder 21 on the second slider 20 is aimed at spacing the countercam 8 below the knitting forming cam 6 and is contrasted by elastic return means constituted by a spring 23 which is interposed between the second slider 20 and a plate 24 which is fixed to the base 12 of the block 10.
  • a second fluid-dynamic actuator for example another pneumatic cylinder 25, which is mounted on the base 12 of the block 10 and acts on the end of another lever 26 pivoted to the shoulder 14 with an intermediate portion and faces, with its other end, the upper end of the first slider 16.
  • the action performed by the pneumatic cylinder 25 on the slider 16 is aimed at lowering the first slider 16 rigidly together with the second slider 20, and is contrasted by elastic return means constituted by a spring 27 which is fixed to the base 12 of the block 10 and acts, with its upper end, on the pivot 17 which is rigidly coupled to the first slider 16.
  • first adjustable stroke limit means which are interposed between the first slider 16 and the second slider 20 to delimit the minimum distance between the knitting forming cam 6 and the countercam 8.
  • Said first stroke limit means comprise a screw 28 which passes through the portion 16a of the first slider 16 and protrudes below it with its tip 28a, thus defining an upper support for the underlying portion 20a of the second slider 20.
  • the maximum mutual approach of the knitting forming cam 6 and of the countercam 8 is adjusted by screwing or unscrewing the screw 28.
  • second adjustable stroke limit means which delimit the sliding of the first slider 16 with respect to the block 10.
  • Said second stroke limit means simply comprise a screw 29, which can be screwed in the upper end of the shoulder 13 and defines, with its collar 29a, a stop element for the rise of the first slider 16, and by another screw 30, which can be screwed in the upper end of the first slider 16 and defines, with its collar 30a, a stop element which engages the upper end of the upright 15 at the end of the lowering of the first slider 16.
  • auxiliary cam 31 movable by control, in a per se known manner, along a radial direction of the needle cylinder 1 from a disengagement position, in which it is spaced laterally to the needle cylinder so as to not interact with the heels of the needles, to an engagement position, in which it is closer to the needle cylinder so as to engage the heels of the needles, and vice versa.
  • Said auxiliary cam 31 has a lower profile defining a descending portion 31a which can engage the heel of the needles which do not knit at the feed 5 so as to lower them if said needles have been accidentally raised due to the tension applied by the knitting or due to transit over previous cams.
  • the lowering action performed by the auxiliary cam 31 is such as to move the heels of the needles which do not knit at the feed 5 to a level which is below the lower end of the knitting forming cam 6.
  • the machine according to the present invention fully achieves the intended aim since, by virtue of the movable condition of the countercam and of the knitting forming cam, it can reach high actuation speeds even when performing knittings which, in conventional machines, prevent the reaching of high speeds due to the risk of breakage or damage of the needles.
  • the materials employed, as well as the dimensions, may be any according to the requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP19930106294 1992-04-29 1993-04-19 Circular knitting machine for manufacturing socks, stockings or the like, with an improved knitting forming cam set Withdrawn EP0567880A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921020A IT1254951B (it) 1992-04-29 1992-04-29 Macchina circolare per maglieria, calzetteria o simile, con gruppo di camme di formazione della maglia perfezionato.
ITMI921020 1992-04-29

Publications (2)

Publication Number Publication Date
EP0567880A2 true EP0567880A2 (fr) 1993-11-03
EP0567880A3 EP0567880A3 (en) 1993-11-24

Family

ID=11363112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930106294 Withdrawn EP0567880A3 (en) 1992-04-29 1993-04-19 Circular knitting machine for manufacturing socks, stockings or the like, with an improved knitting forming cam set

Country Status (3)

Country Link
EP (1) EP0567880A3 (fr)
JP (1) JPH0610245A (fr)
IT (1) IT1254951B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984171A (zh) * 2010-12-06 2011-03-09 宁波裕人数控科技有限公司 电脑丝袜机密度调节装置
CN102926120A (zh) * 2012-11-20 2013-02-13 宁波慈星股份有限公司 一种用于袜类圆型针织机的密度调节装置
CN102926121A (zh) * 2012-11-20 2013-02-13 宁波慈星股份有限公司 一种具有感应报警机构的圆机密度调节装置
CN104514076A (zh) * 2013-10-02 2015-04-15 山德霓股份公司 圆形针织机
CN105063877A (zh) * 2015-08-19 2015-11-18 浙江中宝针织科技有限公司 一种毛圈编织机构
CN107460617A (zh) * 2017-04-14 2017-12-12 浙江叶晓针织机械有限公司 中棱角结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100571290B1 (ko) * 2004-08-24 2006-04-18 (주) 태영기계 양말 편직기
CN109295606A (zh) * 2018-08-28 2019-02-01 浙江凯强轻纺机械有限公司 一种用于袜机的喂纱机构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB357459A (en) * 1931-01-15 1931-09-24 Wilhelm Leilich A circular knitting machine
CS160756B1 (fr) * 1971-02-01 1975-05-04
DE2636020C3 (de) * 1976-08-11 1980-03-20 Mayer & Cie Gmbh & Co, 7470 Albstadt Rundstrickmaschine
IT1153811B (it) * 1980-05-14 1987-01-21 Brematex Spa Macchina circolare da calze e calzini, attrezzata per la lavorazione con un arco di aghi esclusi dal lavoro f mantenuti bassi
CS224063B1 (en) * 1980-12-22 1983-12-30 Jilji Matejicek Lock system of circular knitter for manufacture of hosiery hosi

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984171A (zh) * 2010-12-06 2011-03-09 宁波裕人数控科技有限公司 电脑丝袜机密度调节装置
CN102926120A (zh) * 2012-11-20 2013-02-13 宁波慈星股份有限公司 一种用于袜类圆型针织机的密度调节装置
CN102926121A (zh) * 2012-11-20 2013-02-13 宁波慈星股份有限公司 一种具有感应报警机构的圆机密度调节装置
CN104514076A (zh) * 2013-10-02 2015-04-15 山德霓股份公司 圆形针织机
CN105063877A (zh) * 2015-08-19 2015-11-18 浙江中宝针织科技有限公司 一种毛圈编织机构
CN107460617A (zh) * 2017-04-14 2017-12-12 浙江叶晓针织机械有限公司 中棱角结构

Also Published As

Publication number Publication date
IT1254951B (it) 1995-10-11
EP0567880A3 (en) 1993-11-24
ITMI921020A1 (it) 1993-10-29
ITMI921020A0 (it) 1992-04-29
JPH0610245A (ja) 1994-01-18

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