EP2728045B1 - Kettenwirkmaschine - Google Patents

Kettenwirkmaschine Download PDF

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Publication number
EP2728045B1
EP2728045B1 EP20120007543 EP12007543A EP2728045B1 EP 2728045 B1 EP2728045 B1 EP 2728045B1 EP 20120007543 EP20120007543 EP 20120007543 EP 12007543 A EP12007543 A EP 12007543A EP 2728045 B1 EP2728045 B1 EP 2728045B1
Authority
EP
European Patent Office
Prior art keywords
warp knitting
knitting machine
machine according
guide bar
pattern device
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.)
Not-in-force
Application number
EP20120007543
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2728045A1 (de
Inventor
Herbert Wamser
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.)
Karl Mayer Textilmaschinenfabrik GmbH
Original Assignee
Karl Mayer Textilmaschinenfabrik GmbH
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 Karl Mayer Textilmaschinenfabrik GmbH filed Critical Karl Mayer Textilmaschinenfabrik GmbH
Priority to EP20120007543 priority Critical patent/EP2728045B1/de
Priority to CN201310027829.6A priority patent/CN103806215B/zh
Publication of EP2728045A1 publication Critical patent/EP2728045A1/de
Application granted granted Critical
Publication of EP2728045B1 publication Critical patent/EP2728045B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
    • D04B27/24—Thread guide bar assemblies
    • D04B27/26—Shogging devices therefor

Definitions

  • the invention relates to a warp knitting machine with a machine frame, at least one guide bar and a pattern device with a circumferential control surface, which drives the guide bar in an offset direction.
  • Such a warp knitting machine is for example off DE 195 04 467 C2 known.
  • the knitting needles are usually arranged on a knitting needle and the guide needles on a Garnadelbarre.
  • the Garnadelbarre is through the pattern device in Displacement direction displaced, ie in the direction of its longitudinal extent.
  • the guide bar is pivotable transversely to the offset direction. During this pivoting movement the guide needles are guided through alleys between the knitting needles.
  • the distance between adjacent guide needles or between adjacent knitting needles is relatively small. It is often in the order of 1 mm and may well be less than 1 mm.
  • the guide needles must therefore be able to be moved relative to the knitting needles with high accuracy in order to avoid a collision between the guide needles and the knitting needles.
  • a warp knitting machine is often subjected to temperature changes.
  • temperature differences arise between machine downtime and a production phase. In the first place, these temperature differences arise due to different heat energy outputs of the machine itself, but also external influences, such as temperature differences in the machine environment or direct sunlight, can change the temperature of the warp knitting machine.
  • a change in temperature in many elements of the warp knitting machine results in a change in length due to thermal expansion.
  • Such thermal expansion can cause the trajectory of the guide needles to change relative to the knitting needles. This can easily lead to division problems, namely unauthorized close intervals between the guide needles and the knitting needles, which can lead to a collision of knitting tools.
  • warp knitting machine If the warp knitting machine is kept at an elevated temperature, division problems can be largely avoided. However, there are relatively high costs in the production and operation of the warp knitting machine because a heater must be provided and operated, the operation of the heater has a significant energy consumption.
  • US 2,921,452 A shows a warp knitting machine with a guide bar and a pattern device with a rotating control surface which drives the guide bar in an offset direction. Between the guide bar and a voltage applied to the control surface ram a variable length connection is arranged.
  • DE 489 059 C shows a pattern gear for a flat warp knitting machine, in which a guide bar is driven by a pattern device with a rotating control surface. Between the pattern device and the guide bar driving ram a step portion is arranged, with the aid of a distance between the plunger and the control surface is variable.
  • the invention has for its object to keep in a cost effective manner a pitch deviation of the guide bar, which is due to changes in environmental conditions, small or to avoid.
  • This object is achieved in a warp knitting machine of the type mentioned above in that the patterning device is displaced by a correction drive in the offset direction.
  • the pattern device is arranged at one end of the machine frame. So if the machine frame lengthens with a temperature increase, the pattern device is displaced. Even if this shift is relatively small, it can lead to division problems. This is counteracted by the fact that the pattern device is completely or partially displaced by the correction drive to compensate for the thermal expansion of the machine frame. This compensation movement is then just if relatively small, because they basically just have to compensate for the thermal expansion of the machine frame.
  • the correction drive can thus move the pattern device in the offset direction on the machine frame or away from the machine frame. In this case, the pattern device can be displaced as a whole.
  • the correction drive acts on the pattern device via a reduction gear. This makes it possible to control the change of the pattern device very accurately. Even if the correction drive, which can be embodied, for example, as an electric rotary motor or as a stepping motor, covers a greater path or angle of rotation, the movement acting on the pattern device can be kept small.
  • the correction drive acts on the pattern device via a spindle drive.
  • a spindle drive two elements cooperate, which are connected to each other via a thread pairing. Depending on the pitch of the thread pairing, a linear movement with a very large reduction can then be generated.
  • the correction drive changes the length of a transmission element between the control surface and the guide bar.
  • the control surface is often replaced by a rotating Disc formed whose circumference has a profile that controls the movement of the guide bar.
  • a pattern chain can be provided to control the offset movement of the guide bar.
  • a transmission element often referred to as "offset slider" provided between the guide bar and the control surface. If the length of the transmission element is changed, this also compensates for the thermal expansion of the machine frame.
  • the transmission element has at least two sections connected to one another by a thread pairing, which sections can be rotated relative to one another by the correction drive.
  • the change in the length of the transfer element needed to compensate for the thermal expansion of the machine frame is relatively small, so that it can be effected by twisting two elements which are connected together by threading.
  • the correction drive is controlled by a controller which is connected to a sensor arrangement which determines an influence of at least one environmental condition on the machine frame.
  • a controller which is connected to a sensor arrangement which determines an influence of at least one environmental condition on the machine frame.
  • the controller controls the correction drive so that the thermal expansion of the machine frame is compensated.
  • the sensor arrangement it is preferable for the sensor arrangement to have a distance sensor which determines a distance between the guide bar and a fixed point assigned to the pattern device and outputs a corresponding output signal to the controller.
  • the pattern device is arranged at one end of the machine frame. As the length of the machine frame changes, the position of the pattern device changes. In a guide bar made of a plastic, however, their length practically does not change with a temperature change. One can now determine an actual distance between the pattern device and the guide bar and compare this actual distance with a desired value. If there are differences, the correction drive is put into operation to bring the difference to zero.
  • the controller evaluates the output signal at predetermined positions of the control surface. When the control surface is moved, this movement creates a movement of the guide bar in the offset direction. This results in an output signal of the distance sensor that changes continuously. However, one can determine a "zero point" at which the guide bar is, for example, in a neutral position or at a predetermined reversal point. The distance between the guide bar and the fixed point should correspond to the setpoint value at this zero point or reversal point. Otherwise, a correction movement is necessary.
  • the controller continuously evaluates the output signal and with a setpoint function corresponding to a control cam of the control surface compares.
  • the controller has the information about the movement of the guide bar in the offset direction. It can continuously or at short intervals determine whether the guide bar actually follows this control curve or whether a distance has overlapped. Should such a distance be seen, the correction drive can be put into operation to compensate for the thermal expansion of the machine frame.
  • the sensor arrangement has a temperature sensor which determines a temperature of the machine frame.
  • the temperature can certainly be determined at various points of the machine frame. A temperature determination on the pattern device is possible. From the temperature of the machine frame, one can then obtain the information about the change in length of the machine frame, due to which the correction drive is put into operation to compensate for the thermal expansion.
  • the controller has a temperature-position deviation ratio curve and calculates a correction value from the temperature and the temperature-position deviation ratio curve. With the calculated value, the controller can then control the correction drive to compensate for the thermal expansion of the machine frame.
  • Fig. 1 shows in highly schematic form a warp knitting machine 1 with a machine frame 2, which carries a knitting needle bar 3, on the knitting needles 4 are arranged side by side.
  • a main shaft not shown is arranged, which moves the knitting needle 3, in simple terms, up and down.
  • the machine frame 2 also carries a guide bar 5, are arranged on the guide needles 6.
  • the guide bar 5 is driven via the main shaft so that the guide needles 6 perpendicular to the plane (based on the representation of Fig. 1 ) are pivoted.
  • the guide needles 6 pass through streets between the knitting needles. 4
  • a pattern device 7 is arranged, which has a cam disk 8 in the present case.
  • the cam disk 8 has a control surface 9 on its circumference.
  • an offset slider 10 as a transmission element, which acts on a plunger 11 on the guide bar 5 and drives the guide bar 5 in a so-called offset direction.
  • the displacement direction corresponds to the longitudinal extent of the guide bar 5.
  • the guide bar 5 is loaded by not shown return means, such as springs, in the direction of the pattern device 7, so that the offset slide 10 is always applied to the control surface 9.
  • the guide bar 5 and often the knitting needle bar 3 are formed from a fiber-reinforced plastic, that is, from a material having a relatively low thermal expansion.
  • the thermal expansion of fiber reinforced plastics is negligible in practice.
  • the situation is different with the machine frame 2.
  • the machine frame 2 changes its length with the temperature. As the temperature increases, the machine frame 2 becomes slightly longer. This extension of the machine frame 2 causes the position of the pattern device 7 changed and accordingly the guide bar 5 is driven in a different way. The offset movement of the guide bar 5 then has changed start and end points or reversal points.
  • the pattern device 7 is provided with a correction drive 12 which can displace the pattern device 7 relative to the machine frame 2 in the offset direction.
  • a correction drive 12 which can displace the pattern device 7 relative to the machine frame 2 in the offset direction.
  • the position of the pattern device 7 is changed as a whole.
  • the patterning device 7 is moved by the correction drive 12 by the amount of extension in the direction of the guide bar 5, so that the movement path of the guide bar 5 in the offset direction again corresponds to the desired trajectory, through the control surface. 9 the cam 8 is specified.
  • the correction drive 12 is arranged between a head piece 13 of the machine frame 2 and the pattern device 7. Between the header 13 and the pattern device 7, a slide rail assembly 14 is provided, on which the pattern device 7 can slide relative to the head piece 13 when the correction drive 12 is actuated. The actuation of the correction drive 12 can be done manually by an operator.
  • a distance sensor 15 is provided, which is arranged on a stand which forms a fixed point 16.
  • the distance between the fixed point 16 and the pattern device 7 is so small that a possible thermal expansion of the machine frame 2 or the head piece 13 has no practically relevant influence on a change in the position of the fixed point 16 relative to the pattern device 7. It can therefore be assumed for the practice that the fixed point 16 is assigned to the pattern device 7.
  • the distance sensor 15 is connected to a controller 17, which in turn drives the correction drive 7 and actuates the correction drive 12 in response to an output signal of the distance sensor 15.
  • the guide bar 5 moves under the influence of the control surface 9 back and forth.
  • the control surface 9 In order to effect the correction of the position of the pattern device 7, there are various possibilities.
  • the correction driver 12 is operated to make the actual distance coincident with the target distance.
  • the distance sensor 15 continuously determines the distance between the fixed point 16 and the guide bar 5 and reports to the controller 17.
  • the desired position curve of the guide bar 5 is stored. This desired position curve of the guide bar 5 is predetermined by the control surface 9. If the actual position curve of the guide bar does not match the desired position curve of the guide bar 5, then the correction drive 12 is actuated to restore the match. Since the deviation between the actual positional curve and the desired positional curve consists only in an offset caused by the thermal expansion of the machine frame 2, the correspondence between the actual positional curve and the desired positional curve of the guide bar 5 can be achieved by a simple displacement make the pattern device 7.
  • the position of the pattern means 7 is changed as a whole, i. the pattern device 7 is changed by the correction drive 12 as a whole.
  • An alternative to the displacement of the pattern device 7 according to the invention is that while leaving the position of the pattern device 7 as a whole unchanged, but the length of the offset slider 10 changed.
  • the change in the length of the offset slider 10 corresponds to the thermal expansion of the machine frame 2.
  • the change in the length of the offset slider 10 is effected by a further correction drive 18.
  • the pattern device 7 can be moved, so to speak, as a block. This presentation was chosen for clarity. It is, of course, possible for the pattern device 7 to be in total, i. with their entire housing, to shift relative to the machine frame 2. But it is also possible to shift only parts of the pattern device 7, in particular the cam 8, in the offset direction.
  • Fig. 2 shows a highly schematic representation of a modified embodiment of a warp knitting machine 1, in which the same elements are provided with the same reference numerals.
  • the distance sensor 5 is replaced by a plurality of temperature sensors 19-21, which determine the temperatures at different locations of the machine frame 2. From the determined temperatures and a temperature position deviation ratio curve, the controller 17 constantly calculates a correction value with which the correction drive 12 can be controlled to compensate for the thermal expansion of the machine frame 2.
  • Fig. 3 shows a possible embodiment of the correction drive 12.
  • the correction drive 12 has a drive motor 22 which acts via a reduction gear 23 with a plurality of gears 24, 25 on a rack 26 which is connected to the pattern device 7.
  • the drive motor 22, however, is connected to the head piece 13.
  • the drive motor 22 may be formed, for example, as a stepper motor. When the drive motor 22 is actuated, the gears 24, 25 rotate and thus move the rack 26th
  • Fig. 4 shows a second embodiment of the correction drive 12.
  • the drive motor 22 rotates the spindle 27, the distance between the drive motor 22 and the spindle nut 28 changes.
  • a very sensitive adjustment can be made here.
  • Fig. 5 shows an embodiment of the further correction drive 18.
  • the offset slider 10 has a rotatably held spindle nut 29, with which a spindle 30 is engaged.
  • the spindle 30 is rotatably connected to a gear 32.
  • With the gear 32 is another gear 31 is engaged by a drive motor 33 can be driven.
  • the spindle 3 in turn is rotatably mounted on a part 34 of the offset slide 10, on which a roller 35 is arranged, which bears against the control surface 9.
  • the drive motors 22, 33 are, as indicated by an arrow, with the controller 17 in connection.
  • the control surface 9 can of course also be formed by a circumferential chain of cam members, if the offset movement 11 of the guide bar 5 requires this.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP20120007543 2012-11-06 2012-11-06 Kettenwirkmaschine Not-in-force EP2728045B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20120007543 EP2728045B1 (de) 2012-11-06 2012-11-06 Kettenwirkmaschine
CN201310027829.6A CN103806215B (zh) 2012-11-06 2013-01-25 经编机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120007543 EP2728045B1 (de) 2012-11-06 2012-11-06 Kettenwirkmaschine

Publications (2)

Publication Number Publication Date
EP2728045A1 EP2728045A1 (de) 2014-05-07
EP2728045B1 true EP2728045B1 (de) 2014-10-01

Family

ID=47191476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120007543 Not-in-force EP2728045B1 (de) 2012-11-06 2012-11-06 Kettenwirkmaschine

Country Status (2)

Country Link
EP (1) EP2728045B1 (zh)
CN (1) CN103806215B (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3095904B1 (de) * 2015-05-21 2017-03-22 Karl Mayer Textilmaschinenfabrik GmbH Legebarrenanordnung einer kettenwirkmaschine
CN109736007B (zh) * 2019-03-12 2020-04-07 江南大学 一种高速型双针床经编机花型加载的控制实现方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE489059C (de) * 1925-12-04 1930-01-11 Wilhelm Barfuss Mit Stufenkeil arbeitendes Mustergetriebe fuer flache Kettenwirkmaschinen
US2921452A (en) * 1953-09-08 1960-01-19 Textile Machine Works Knitting machines and operating mechanism therefor
DE1896204U (de) 1960-02-08 1964-07-09 Mayer Fa Karl Kettenwirkmaschine mit heizbaren barren.
US4086792A (en) * 1977-08-03 1978-05-02 Joan Manufacturing Corporation Weft inlay racking control
DE4303967C2 (de) * 1993-02-10 1995-03-30 Liba Maschf Kettenwirkmaschine mit auf einer Legebarre angebrachten individuell bewegbaren Fadenführern
DE4411528C2 (de) * 1994-04-02 1997-06-26 Mayer Textilmaschf Kettenwirkmaschine
DE19504467C2 (de) 1995-02-10 1997-07-24 Liba Maschf Kettenwirkmaschine mit einer Mustervorrichtung und einem Ölumlauf

Also Published As

Publication number Publication date
CN103806215A (zh) 2014-05-21
EP2728045A1 (de) 2014-05-07
CN103806215B (zh) 2016-01-20

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