EP0727516A1 - Doppeltzylinder-Rundstrickmaschine für die Herstellung von Socken, Strümpfen und derartigen mit Gestrick-Abzugvorrichtung - Google Patents

Doppeltzylinder-Rundstrickmaschine für die Herstellung von Socken, Strümpfen und derartigen mit Gestrick-Abzugvorrichtung Download PDF

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Publication number
EP0727516A1
EP0727516A1 EP96101588A EP96101588A EP0727516A1 EP 0727516 A1 EP0727516 A1 EP 0727516A1 EP 96101588 A EP96101588 A EP 96101588A EP 96101588 A EP96101588 A EP 96101588A EP 0727516 A1 EP0727516 A1 EP 0727516A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
tensioning
machine according
fluid
axis
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Withdrawn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
EP96101588A
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English (en)
French (fr)
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
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 filed Critical Lonati SpA
Publication of EP0727516A1 publication Critical patent/EP0727516A1/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Withdrawn legal-status Critical Current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
    • D04B15/88—Take-up or draw-off devices for knitting products
    • D04B15/92—Take-up or draw-off devices for knitting products pneumatic
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/10—Circular knitting machines with independently-movable needles with two needle cylinders for purl work or for Links-Links loop formation

Definitions

  • the present invention relates to a double-cylinder circular knitting machine for manufacturing socks, stockings and the like with a device for tensioning the knitted fabric.
  • Double-cylinder circular machines which have a device for tensioning the knitted fabric that comprises an element for retaining the initial portion of the fabric, which is arranged inside the lower needle cylinder proximate to the region where the knitting is formed, and a fluid-actuated piston provided with a hollow stem that is open at its ends and is slideable inside a cylindrical chamber formed coaxially in the upper needle cylinder.
  • the retention element faces the lower end of the stem of the piston, and its dimensions are such as to allow the descent of the stem into the lower needle cylinder by passing around said retention element, so as to apply tension to the fabric that stretches from the retention element to the knitting-forming region of the machine.
  • the upper end of the stem can be connected to a suction device that sucks the fabric at the end of its processing and also causes it to turn inside out.
  • the descent of the piston to achieve tensioning of the fabric being formed is achieved by gravity, by providing appropriate piston weighting elements, whereas the piston is usually raised by pressurized fluid fed into the cylindrical chamber.
  • the aim of the present invention is to solve the problems described above by providing a double-cylinder circular knitting machine for manufacturing socks, stockings and the like with a knitted fabric tensioning device that allows to very simply and easily vary, according to requirements, the tensioning force to which the knitted fabric is subjected.
  • an object of the invention is to provide a machine with a tensioning device that allows to vary the tensioning force to which the fabric is subjected even during the formation of the knitted fabric.
  • Another object of the invention is to provide a machine with a tensioning device that allows to control, at all times, the tensioning force applied to the knitted fabric being formed.
  • Another object of the invention is to provide a machine with a fabric tensioning device, wherein the tensioning force to which the fabric is subjected, can vary according to a preset program as a function of the type of knitting, the type of yarn, and other parameters of the knitting being formed.
  • a double-cylinder circular knitting machine for manufacturing socks, stockings and the like with a device for tensioning the knitted fabric, which comprises a lower needle cylinder and an upper needle cylinder which are mutually coaxial and can be rotationally actuated about their substantially vertical common axis, said needle cylinders internally accommodating a tensioning device for the knitted fabric being formed, which comprises: retention means for retaining the fabric proximate to a knitting forming region, and a tensioning cylinder, which is hollow and open at its axial ends, said tensioning cylinder being accommodated in said upper needle cylinder, and controllably movable along said axis, a lower end of said tensioning cylinder being engageable, by sliding along said axis, with the knitted fabric being formed, said retention means having a size that allows the movement of said tensioning cylinder about said retention means; characterized in that it comprises actuation means that act on said tensioning cylinder to move it along said axis and adjustment means
  • the machine according to the invention comprises a lower needle cylinder 2 and an upper needle cylinder 3 that are mutually coaxial and can be rotationally actuated about their common axis 4, which is arranged vertically.
  • the upper needle cylinder 3 is supported, so that it can rotate about the axis 4, by a supporting structure 5 by means of a main bearing 6.
  • the rotary actuation of the upper needle cylinder 3 is achieved, in a known manner, by means of a motor, not shown for the sake of simplicity, that is connected to a gear 7 which is fixed coaxially to the upper needle cylinder 3.
  • a hollow suction cylinder 8 is arranged inside the upper needle cylinder 3 and coaxially thereto, rotates rigidly with the upper needle cylinder 3 about the axis 4, and is connected, at its upper open end, to a duct 9 that can be connected on command to a suction device.
  • the machine according to the invention is provided with a fabric tensioning device that comprises fabric retention means, which are conveniently constituted by a plug-like element 11 that is slideable, in a known manner, inside the lower needle cylinder 2 along the axis 4 to engage inside the lower end of the hollow suction cylinder 8 so as to lock the initial end of the fabric, which is sucked along the hollow suction cylinder 8.
  • fabric retention means which are conveniently constituted by a plug-like element 11 that is slideable, in a known manner, inside the lower needle cylinder 2 along the axis 4 to engage inside the lower end of the hollow suction cylinder 8 so as to lock the initial end of the fabric, which is sucked along the hollow suction cylinder 8.
  • the fabric tensioning device also comprises a tensioning cylinder 12 that is hollow and is open at its axial ends.
  • the tensioning cylinder 12 is arranged internally and coaxially in the upper needle cylinder 3, around the hollow suction cylinder 8.
  • the tensioning cylinder 12 can move on command along the axis 4, and its lower end can engage, by virtue of its sliding along the axis 4, the knitted fabric 13 being formed.
  • the retention means constituted by the plug-like element 11, have dimensions that allow the movement of the tensioning cylinder 12 around the retention means; i.e., the diameter of the plug-like element 11 is smaller than the inside diameter of the tensioning cylinder 12, so that said cylinder can slide freely downward despite the presence of the plug-like element 11.
  • the fabric tensioning device also comprises actuation means that act on the tensioning cylinder 12 to cause its movement along the axis 4 and means for adjusting the intensity of the force applied by the actuation means to the tensioning cylinder 12 in a direction that is substantially parallel to the axis 4, at least during the tensioning of the knitted fabric being formed, so as to allow adjustment, according to the requirements, of the tensioning force to which the knitting is subjected during tensioning.
  • a flanged tubular body 14 that is rigidly coupled to the upper needle cylinder 3 for example by means of a tab 15 that is provided at the gear 7.
  • the flanged tubular body 14 has, at its upper end, teeth 16 that engage axially inside axial slots 17 formed in the skirt of a tubular supporting body 18 mounted coaxially on the flanged tubular body 14.
  • a chamber 19 is formed between the tubular supporting body 18 and the hollow suction cylinder 8, and the tensioning cylinder 12 is accommodated inside it.
  • the tubular supporting body 18 is supported, so that it can rotate about the axis 4, through two bearings 20 and 21, by a casing 22 that surrounds the upper part of the upper needle cylinder 3 and is rigidly coupled to the supporting structure 5 of the machine.
  • the tubular supporting body 18 rotates about the axis 4 rigidly with the flanged tubular body 14 and thus with the upper needle cylinder 3.
  • the tensioning cylinder 12 has, at its upper end, a flange 23 that is provided with a radially protruding tooth 24 for each one of the axial slots 17 of the tubular supporting body 18.
  • the teeth of the flange 23 slidingly pass through the axial slots 17 and support a bearing 25 arranged coaxially to the tensioning cylinder 12.
  • the bearing 25 connects the tensioning cylinder 12 to a slider 26 which is slideable inside vertical guides 27 formed in a block that is fixed laterally with respect to the casing 22.
  • the slider 26 is coupled to the guides 27 by means of pairs of bearings 28.
  • the tensioning cylinder 12 rotates rigidly with the upper needle cylinder 3 about the axis 4 and is also connected to the slider 26.
  • the slider 26 however can only move parallel to the axis 4.
  • the means for the actuation of the tensioning cylinder 12 along the axis 4 are advantageously constituted by a double-action fluid-actuated cylinder 30 that is supported by the casing 22, or by the supporting structure of the machine, and is arranged so that its axis is parallel to the axis 4.
  • the stem 31a of the piston 31 of the fluid-actuated cylinder 30 is connected to the slider 26, so that by feeding one of the feed ports 32 and 33 of the fluid-actuated cylinder 30 with a pressurized fluid, and by connecting the other feed port to the discharge, the slider 26 performs a translatory motion along the guides 27, i.e, the tensioning cylinder 12 performs a translatory motion along the axis 4.
  • the means for adjusting the intensity of the force applied to the tensioning cylinder 12 in a direction that is parallel to the axis 4 are conveniently constituted by a valve 40 for adjusting the feed pressure of the fluid-actuated cylinder 30; said valve is located along the feed duct 41 that is connected to the port 32, i.e., to the port 32 which, when fed with pressurized fluid, causes the lowering of the tensioning cylinder 12.
  • the port 33 is connected to another duct 42, and a slide valve 43 is arranged on the ducts 41 and 42 and selectively connects the duct 41 to a pressurized fluid line 44 while the duct 42 is connected to a discharge, or vice versa, so as to cause the downward or upward movement of the tensioning cylinder 12.
  • the adjustment means also comprise an auxiliary feed duct 45 that is connected, by means of a selector valve 46, to the feed duct 41 downstream of the adjustment valve 40 along the direction of the fluid that enters the fluid-actuated cylinder 30.
  • the selector valve 46 connects the auxiliary feed duct 45 to the feed duct 41 when the pressure along the auxiliary feed duct 45 exceeds the pressure along the duct 41 upstream of the selector valve 46.
  • the auxiliary feed duct 45 is connected to a line for feeding a pressurized fluid 47 through a slide valve 48 that can be actuated to connect the auxiliary feed duct 45 to the line 47 or to interrupt this connection.
  • Pressure sensing means are provided along the duct 41, downstream of the selector valve 46 and of the adjustment valve 40 along the direction of the fluid that enters the fluid-actuated cylinder 30; said means can be constituted for example by a pressure transducer 49.
  • the tensioning device also comprises means for sensing the movement of the tensioning cylinder 12 along the axis 4.
  • Said sensing means are conveniently constituted by two pulleys 51 and 52 that are arranged so that their axes are horizontal and aligned along a vertical plane.
  • the two pulleys 51 and 52 are mutually connected by a toothed belt 53 that is fixed laterally to the slider 26, so that the sliding of the tensioning cylinder 12 causes a translatory motion of the toothed belt 53.
  • the casing 54 that contains the belt 53 can be conveniently made of transparent material, and it is possible to place on the belt 53 an indicator 55 that abuts against a series of notches 56 provided on the casing, so as to allow the operator to visually check the movement of the tensioning cylinder 12.
  • the means for sensing the movement of the tensioning cylinder 12 may also be of the electronic type, i.e., constituted by an encoder 57 whose shaft is connected to the axis of one of the pulleys 51 or 52; in the illustrated case, to the pulley 52.
  • Means for sensing the upper and lower stroke limit position of the tensioning cylinder 12 are also arranged on the casing 22 and are conveniently constituted by two proximity sensors, designated by the reference numerals 71 and 72 respectively.
  • the force applied by the tensioning cylinder 12 to the fabric being formed can be adjusted manually by providing, for example, a device for visualizing the preset required force and a device for visualizing the force actually applied by the tensioning cylinder 12 to the fabric, which can be connected to the transducer 49 which, by sensing the feed pressure of the fluid-actuated cylinder 30, during the descent of the tensioning cylinder 12, also senses the force that is actually discharged onto the knitted fabric being formed.
  • the operator can act manually on the adjustment valve 40, so as to increase or decrease the feed pressure of the fluid-actuated cylinder 30 while said cylinder actuates the descent of the tensioning cylinder 12, so that the force actually applied by the tensioning cylinder 12 corresponds to the preset force.
  • the adjustment of the fabric tensioning force can also be fully automated, by providing an electronic monitoring and control element 60, constituted for example by a programmable microprocessor, whose input is connected to the pressure transducer 49, to the encoder 57, and to the proximity sensors 71 and 72. Said monitoring and control element 60 actuates the slide valve 43 and the slide valve 48 according to a preset program.
  • an electronic monitoring and control element 60 constituted for example by a programmable microprocessor, whose input is connected to the pressure transducer 49, to the encoder 57, and to the proximity sensors 71 and 72.
  • Said monitoring and control element 60 actuates the slide valve 43 and the slide valve 48 according to a preset program.
  • a feed layout such as the one shown in figure 5 for the fluid-actuated cylinder 30.
  • a proportional valve 80 is placed on the feed duct of the port 32 of the fluid-actuated cylinder 30 and is controlled by the monitoring and control element 60; by means of said proportional valve, the monitoring and control element 60 is capable of varying the feed pressure of the cylinder 30 while said cylinder actuates the descent of the tensioning cylinder 12, according to a preset program.
  • the tensioning cylinder 12 In inactive conditions, as shown in particular in figure 1, the tensioning cylinder 12 is in the maximum lifting position, and this position is sensed by the proximity sensor 71 that faces the bearing 24.
  • the tensioning cylinder 12 is kept in the lifted position by feeding pressurized fluid to its port 33, while the port 32 is connected to a discharge, as shown by the position of the slide valve 43 shown in figure 1.
  • the initial flap of the knitted fabric is sucked inside the hollow suction cylinder 8 and the plug-like element 11 is raised, so as to clamp the initial end of the knitted fabric being formed, in cooperation with the lower end of the hollow suction cylinder 8.
  • the monitoring and control element 60 which also handles the operation of the entire machine, switches the position of the slide valve 43, connecting the port 33 to the discharge and connecting the port 32 to the line 44, as shown in particular in figure 2.
  • the tensioning cylinder 12 is actuated downward by the fluid-actuated cylinder 30 with a force that depends on the adjustment performed on the adjustment valve 40.
  • the tensioning force can be increased further, if required, by connecting the line 47 to the port 32, either by means of a manual action, with the embodiment of the device shown in figures 1 to 4, or in a fully automatic way, handled by the monitoring and control element 60, by means of the proportional valve 80.
  • the fabric tensioning device according to the invention in addition to varying the tensioning force, according to the requirements, also allows to control the actual length of the formed knitted product. Accordingly, it is possible to provide for a connection of the monitoring and control element 60 to a device for adjusting the tightness of the knitting, in a per se known manner which is not illustrated for the sake of simplicity, so that the tightness of the knitting can be changed if the length of the product varies with respect to a preset length.
  • the plug-like element 11 is disengaged from the lower end of the hollow suction cylinder 8 so that the product is sucked upward inside the hollow suction cylinder 8 and moved away from the machine, while the feed of the fluid-actuated cylinder 30 is again reversed so as to cause the lifting of the tensioning cylinder 12 to return it to the inactive position.
  • the proximity sensor 71 has sensed that the inactive position has been reached by the tensioning cylinder 12, the cycle resumes as already described.
  • the proximity sensor 72 may also not be reached by the bearing 24 because the feed of the fluid-actuated cylinder 30 can be reversed before the tensioning cylinder 12 reaches its maximum downward position, due to a direct intervention of the monitoring and control element 60.
  • Another advantage of the machine with the tensioning device according to the invention is that it is possible to increase the tensioning force during the formation of the knitted fabric.
  • Another advantage of the invention is that of allowing control of the actual length of the formed product.
  • the materials employed, as well as the dimensions, may be any according to the requirements and the state of the art.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP96101588A 1995-02-17 1996-02-05 Doppeltzylinder-Rundstrickmaschine für die Herstellung von Socken, Strümpfen und derartigen mit Gestrick-Abzugvorrichtung Withdrawn EP0727516A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950296 1995-02-17
ITMI950296A IT1273934B (it) 1995-02-17 1995-02-17 Macchina circolare per maglieria o calzetteria a doppio cilindro con dispositivo di tiraggio del tessuto a maglia

Publications (1)

Publication Number Publication Date
EP0727516A1 true EP0727516A1 (de) 1996-08-21

Family

ID=11370584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101588A Withdrawn EP0727516A1 (de) 1995-02-17 1996-02-05 Doppeltzylinder-Rundstrickmaschine für die Herstellung von Socken, Strümpfen und derartigen mit Gestrick-Abzugvorrichtung

Country Status (4)

Country Link
EP (1) EP0727516A1 (de)
JP (1) JPH08246301A (de)
CZ (1) CZ39896A3 (de)
IT (1) IT1273934B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20111686A1 (it) * 2011-09-19 2013-03-20 Lonati Spa Macchina circolare per maglieria o per calzetteria a doppio cilindro con dispositivo di tiraggio del manufatto a maglia.
CN103132226A (zh) * 2013-03-15 2013-06-05 厦门纬天机械有限公司 针织机卷布机构改进装置
CN110512347A (zh) * 2019-04-10 2019-11-29 浙江叶晓机械科技有限公司 一种双针筒织机编织方法
CN114381854A (zh) * 2020-10-19 2022-04-22 浙江博睿智能科技有限公司 一种针对管状织物的撸动装置和撸动方法
USD961627S1 (en) * 2019-06-17 2022-08-23 Santoni S.P.A. Textile machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE654671A (de) * 1963-10-22 1965-02-15
US3797280A (en) * 1972-04-24 1974-03-19 F Lonati Stretcher device for articles under manufacture on double cylinder circular knitting machines
EP0516049A1 (de) * 1991-05-31 1992-12-02 LONATI S.p.A. Doppelzylinder-Rundstrickmaschine zur Herstellung von Socken und Strümpfen mit Gestrick-Abzugvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE654671A (de) * 1963-10-22 1965-02-15
US3797280A (en) * 1972-04-24 1974-03-19 F Lonati Stretcher device for articles under manufacture on double cylinder circular knitting machines
EP0516049A1 (de) * 1991-05-31 1992-12-02 LONATI S.p.A. Doppelzylinder-Rundstrickmaschine zur Herstellung von Socken und Strümpfen mit Gestrick-Abzugvorrichtung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20111686A1 (it) * 2011-09-19 2013-03-20 Lonati Spa Macchina circolare per maglieria o per calzetteria a doppio cilindro con dispositivo di tiraggio del manufatto a maglia.
WO2013041269A1 (en) 2011-09-19 2013-03-28 Lonati S.P.A. Double-cylinder circular hosiery knitting machine with device for tensioning the manufacture
CN103827372A (zh) * 2011-09-19 2014-05-28 罗纳地股份公司 具有用于张紧制成品的装置的双针筒圆型袜类针织机
US9365961B2 (en) 2011-09-19 2016-06-14 Lonati S.P.A. Double-cylinder circular hosiery knitting machine with device for tensioning the manufacture
CN103827372B (zh) * 2011-09-19 2016-11-02 罗纳地股份公司 具有用于张紧制成品的装置的双针筒圆型袜类针织机
EA026230B1 (ru) * 2011-09-19 2017-03-31 ЛОНАТИ С.п.А. Двухцилиндровая круглочулочная вязальная машина с устройством для натяжения изделия
CN103132226A (zh) * 2013-03-15 2013-06-05 厦门纬天机械有限公司 针织机卷布机构改进装置
CN103132226B (zh) * 2013-03-15 2014-06-04 厦门纬天机械有限公司 针织机卷布机构改进装置
CN110512347A (zh) * 2019-04-10 2019-11-29 浙江叶晓机械科技有限公司 一种双针筒织机编织方法
USD961627S1 (en) * 2019-06-17 2022-08-23 Santoni S.P.A. Textile machine
CN114381854A (zh) * 2020-10-19 2022-04-22 浙江博睿智能科技有限公司 一种针对管状织物的撸动装置和撸动方法
CN114381854B (zh) * 2020-10-19 2024-04-16 浙江博睿智能科技有限公司 一种针对管状织物的撸动装置和撸动方法

Also Published As

Publication number Publication date
CZ39896A3 (en) 1996-09-11
JPH08246301A (ja) 1996-09-24
ITMI950296A0 (it) 1995-02-17
IT1273934B (it) 1997-07-11
ITMI950296A1 (it) 1996-08-17

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