EP0319007B1 - Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens - Google Patents

Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0319007B1
EP0319007B1 EP88120095A EP88120095A EP0319007B1 EP 0319007 B1 EP0319007 B1 EP 0319007B1 EP 88120095 A EP88120095 A EP 88120095A EP 88120095 A EP88120095 A EP 88120095A EP 0319007 B1 EP0319007 B1 EP 0319007B1
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EP
European Patent Office
Prior art keywords
needle
jack
impact
selection
drive
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.)
Expired - Lifetime
Application number
EP88120095A
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German (de)
English (en)
French (fr)
Other versions
EP0319007A1 (de
Inventor
Jacques Vermot-Gaud
Rémi Cottenceau
Erwin Zuercher
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.)
Sipra Patententwicklungs und Beteiligungs GmbH
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Sipra Patententwicklungs und Beteiligungs GmbH
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Publication of EP0319007A1 publication Critical patent/EP0319007A1/de
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Publication of EP0319007B1 publication Critical patent/EP0319007B1/de
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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
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/82—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the needle cams used
    • 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
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
    • D04B15/78—Electrical devices

Definitions

  • the present invention relates to a method for driving the selection needle pusher of a knitting machine, and a device for carrying out this method, wherein the selection needle pusher can assume two limit positions, and wherein the method takes the path from the first to the second of these limit positions in two stages the first stage of which is to engage an element of the needle pusher with a cam and the second stage results from the relative displacement of the cam and the needle pusher transversely to the plane of the vibration path of the needle pusher.
  • the electromagnetic selection organ produces only a very slight displacement of the selection organs, the rest of the displacement being carried out by the magnetic ramps. Taking into account this slight shift controlled by the electromagnetic selection mechanism, the selection frequency, which is a function of the movement amplitude to be realized, can be increased significantly.
  • this solution has a number of disadvantages. Assuming that the selection organ consists of a soft steel with weak magnetic remanence, the selection can only be made for an organ different from the needle, which is only intended to control the displacement of the needle shaft, which must consist of spring steel. Another disadvantage of this solution is that there are only two positions can be controlled. In fact, the selection element is intended to be attracted to one or the other of the poles when it enters the air gap of the electromagnet adjacent to the two magnetic ramps. The selection member cannot be left in an unguided intermediate position where there would be a risk of being attracted to one or the other of the magnetic ramps which are very close to the selection member at their ends adjacent to the electromagnet.
  • the transmission of motion by means of an elastic impact implies that after an infinitely short time of contact between the impacting and the impacted organs, the speeds of these organs experience a finite change. It is known that when movements between two organs are transmitted by means of an elastic shock, the shock coefficient connecting the speed components of each organ is approximately equal to one at the beginning and at the end of the shock. This means that the thrusting organ suddenly loses all or most of its speed in favor of the thrusting organ, as it does between two billiard balls. Under these circumstances it is obvious that the displacement of the struck organ would in no way depend on the amplitude of the striking organ, as is the case in DE-A-18 04 350.
  • the aim of the present invention is, at least to remedy some of the disadvantages mentioned above.
  • the subject of the present invention is first of all a method for driving the selection needle pushers in a knitting machine, as defined by claim 1.
  • the present invention also relates to an apparatus for performing the method according to claim 2.
  • This method has numerous advantages for a device for selecting needles with a high frequency. It allows, as shown below, a selection at a single level with a frequency of at least 1000 Hz.
  • the shock causes friction between the drive element and the driven element to be prevented. Assuming that the transmission of energy between the two organs takes place in a very short moment, the stroke of the drive element can be very small. As soon as the impact energy has been transmitted to the driven organ, it shifts until this energy is consumed, so that the drive organ can be withdrawn during the displacement of the driven organ. The energy efficiency of such a movement transmission is excellent.
  • the drive member may, for example, be of the type of a needle printer which allows the drive motor of this member to be pushed outwards, in the case of a circular knitting machine increasing the available space in which the motor is located radially away from the knitting head, and the volume and the performance of the engine can be improved.
  • the goal to be achieved is to enable the selection of the needles of the cylinder and the (rib) disc of a machine with a diameter of 76.2 cm (30 "), which contains 72 knitting systems with the fineness number 28 and a peripheral speed of 1 m / s has, with the possibility of the simultaneous selection of three processes, namely stitching, splicing, Zero. Except for the problems of space required by the selection of the needles of such a machine, the implementation of the machine is primarily subordinate to the possibility of selecting the selection needle pusher with practically complete certainty.
  • Fig. 1 shows the different interrelated parameters for the preselection of the needle pusher.
  • reference numeral 1 designates a drive needle of the needle ram 2.
  • This drive needle 1 is displaceable longitudinally to its axis. In the idle state, it assumes the position shown, the front end of this needle 1 reaching the base line 3.
  • the baseline 4 corresponds to the position that the needle pushers 2 are to assume after the preselection.
  • the distance between two side surfaces 2a of two adjacent needle pusher 2 with a fineness number 28 is 0.9 mm and is composed of the thickness of the needle pusher of 0.4 mm and the distance between the needle pusher of 0.5 mm.
  • the time between the passage of the two side surfaces 2a of two successive needle pushers is 0.9 ms.
  • the distance between the end face 2b of the needle pusher 2 and the base line 4 is 0.6 mm.
  • the mass of a needle pusher is 0.3 g, which, taking into account the moment of inertia, corresponds to an equivalent mass of 0.1 g.
  • a complete analysis of the different types of drive of the needle pusher 2 shows that there are essentially two problems with both a push drive of the needle pusher and with a drive needle acting by lateral pushing against an oblique surface of the needle pusher . These problems consist in the friction in the two cases and the lack of safety in the drive due to pure impact.
  • a drive has also been analyzed in which the two surfaces in contact are chamfered and parallel to each other, whereby the drive is generated in part by the displacement of the drive needle and in part by the peripheral speed of the needle pusher driven by the knitting head.
  • the disadvantage of this solution is the change in the drive conditions of the needle pusher after the start-up of the machine in such a way that the drive of the needle pusher is not guaranteed at this stage.
  • the size of the Force can be determined using the theory of Hertz as a function of elastic deformation.
  • This example shows that the drive method according to the invention, which uses a push to drive the needle pusher 2, which fulfills the required conditions at the level of the mechanical interface.
  • the initial speed given to the needle pusher can be greater than 1 m / s, while the required speed is 0.6 m / s.
  • the maximum pressure of 5000 MPa with a bending radius of the contacting surfaces of 2 mm is acceptable. This pressure can also be reduced by increasing the bending radius.
  • the contact time is of the order of 10 ⁇ s.
  • the available space for this drive mechanism is 25 mm
  • the mass of the needle moves between 0.1 and 0.5 g
  • its necessary thickness is 0.4 to, taking into account the safety margins to be observed 0.6 mm
  • the depth of penetration into the path of the needle pushers is between 0.2 and 0.3 mm.
  • the speed to be reached at the moment of impact is 1 m / s.
  • the time available to reach this speed is between 0.2 and 0.4 ms
  • the required acceleration is between 2500 and 5000 m / s2.
  • the backward movement should be similar, since a pass for the back and forth movement of the needle should have a duration of less than 1 ms.
  • FIG. 2 A knitting needle 5, only partially shown, is embedded in a section of a knitting head.
  • a selection needle pusher 2 is swingingly mounted in a receptacle 6 of the knitting needle 5.
  • the sides 6a and 6b of this receptacle 6 are designed in the shape of an arc of a circle and serve to transmit an arc-shaped movement path to the shoulders 2b, 2e of the selection needle pusher 2 between its two limit positions, which on the one hand by its two sides 2c, 2d and on the other hand by the base 6c Recording 6 are formed.
  • a cam 13 is arranged opposite the knitting head 7. With respect to the vertical plane of FIG.
  • this cam is fixed or movable in a round machine type and movable in a rectangular machine and is intended to come into engagement with the projection 2b of the needle pusher 2 so that the needle pusher 2 passes through it
  • Drive needle 1 is moved to bring it into its second limit position.
  • the drive needle 1 is guided in the longitudinal direction by a sapphire slide bearing 8, which is fastened in a housing B carrying the electromagnetic mechanism and is formed integrally with the cam 13.
  • the rear end of this drive needle 1 is attached to a sleeve 9 which is in engagement with a slide 10, which is arranged oscillating in the gap between two electromagnets 11 and 12.
  • a return spring 14 arranged coaxially to the needle 1 is supported at one end on a bearing surface of the housing B and at the other end on the sleeve 9, thus pressing the sleeve 9 against the slide 10.
  • An adjustable abutment 15 consisting of a screw serves to limit the slippage of the slide 10 in order to prevent it from touching the stator of the electromagnet 12 and thus to prevent it from getting caught and avoiding the remanence phenomena.
  • a second adjustable abutment 16 has an elastic element which is connected to an adjusting screw 17 which, by means of its spring force, can deform the elastic element more or less and thus makes it possible to adjust the position of the abutment to prevent the slide from touching the To prevent stator of the electromagnet 11. It is also worth noting that in the event of a power failure, the return spring 14 enables the needle 1 to be withdrawn from the path of movement of the needle pushers.
  • g corresponds to the air gap, for example 0.5 mm, which results in the reluctance (taking into account the scattering inflow):
  • Reluctance 1.25 x 107
  • U 24 volts
  • I 6A
  • U 120 volts
  • I 1.2A
  • the return movement of the drive needle 1 after the impact against the selection needle plunger 2 must be ensured by an opposing force.
  • the device according to FIG. 2 was realized in order to put into practice what was theoretically presented above.
  • This device was realized on the principle of a dot matrix printer head, with a tungsten wire with a diameter of 0.35 mm, which is held elastically against the slide 10 and is guided in the sapphire bearing 8.
  • the peak value of the current is 11A.
  • a speed of the needle 1 at the moment of the impact is of the order of 1.5 m / s, so that the speed of the needle ram immediately after the impact is of the order of 1 m / s lies, which exceeds the required speed of 0.6 m / s calculated above.
  • Figure 4 shows the relative positions of the drive needle 1 and the selection pusher 2 in their respective two extreme positions before and after the impact.
  • the needle pusher 2 is at rest at a distance of 0.2 mm from the end of the needle 1. After the impact, the needle moves to a distance of 0.4 mm from its point of rest and the needle pusher pivots in its receptacle 6 by one To achieve amplitude of 0.6 mm.
  • the peak value of the current is 4 A
  • the pulse duration is 100 ⁇ s
  • the speed is ⁇ 2.4 mS.
  • the solution adopted for the fixed magnetic armatures of the electromagnets 11 and 12 is that of the magnetic circuit C, which, like the circuits sold under the Trafoperm® brand, are separated by vacuum melt.
  • the slider 10 also consists of sheet-shaped, at least smooth sheets, even at the interface, which is preferred. The slider is subjected to heating twice by experiencing a change in flow twice, namely during forward and backward movements.
  • Fig. 6 shows an embodiment of this slide 10, which is formed from a sheet 10a in a U-shape, in which flat sheets 10b are layered.
  • the length of the plates 10b can be limited to the length of the air gap of the electromagnets 11, 12, the portion of the slider 10 which projects from the air gap and to which the needle is attached only through the U-profile 10a is formed.
  • An essential element of this invention is the very important concentration of force on the needle 1.
  • the surface of the slider 10 in the air gap is 24 mm2, a needle with only 0.3 mm diameter then only has a surface area of 0.1 mm2, a ratio of 240 results, with the total energy being concentrated on this surface area of 0.1 mm2.
  • the voltage on the winding 12 can be reduced to 50 volts, so that the peak current drops to 2 A.
  • the device can reach 2000 Hz. Assuming that you do not want to exceed ⁇ 1100 Hz for mechanical reasons, you can reduce the return speed of the needle.
  • the long-term tests with the impact (10 consecutive hours) showed no signs of wear on the needle 1 or on the attachment 2b of the needle pusher 2. In any case, the exertion of force is limited by a certain bending of the needle 1.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP88120095A 1987-12-04 1988-12-01 Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens Expired - Lifetime EP0319007B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4745/87 1987-12-04
CH4745/87A CH673664A5 (enrdf_load_stackoverflow) 1987-12-04 1987-12-04

Publications (2)

Publication Number Publication Date
EP0319007A1 EP0319007A1 (de) 1989-06-07
EP0319007B1 true EP0319007B1 (de) 1992-08-26

Family

ID=4281778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120095A Expired - Lifetime EP0319007B1 (de) 1987-12-04 1988-12-01 Verfahren zum Antrieb der Selektions-Nadelstösser einer Strickmaschine und Vorrichtung zur Durchführung dieses Verfahrens

Country Status (10)

Country Link
US (1) US4875347A (enrdf_load_stackoverflow)
EP (1) EP0319007B1 (enrdf_load_stackoverflow)
JP (1) JP2927436B2 (enrdf_load_stackoverflow)
KR (1) KR890010323A (enrdf_load_stackoverflow)
CH (1) CH673664A5 (enrdf_load_stackoverflow)
CS (1) CS275403B2 (enrdf_load_stackoverflow)
DD (1) DD283658A5 (enrdf_load_stackoverflow)
DE (1) DE3874095D1 (enrdf_load_stackoverflow)
ES (1) ES2035231T3 (enrdf_load_stackoverflow)
RU (1) RU2018548C1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066219A1 (de) 2008-12-11 2010-06-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Strickmaschine zur herstellung von mit mustern versehenen strickwaren und dafür bestimmtes nadelbett

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1216712B (it) * 1988-01-27 1990-03-08 Savio Spa Sistema perfezionato di selezione degli aghi nelle macchine circolari per maglieria ed in particolareper calze.
DE4008155C2 (de) * 1989-03-15 1996-04-18 Nagata Seiki Kk Piezoelektrische Nadelauswahleinrichtung
DE4007253A1 (de) * 1990-03-08 1991-09-12 Sipra Patent Beteiligung Strickmaschine
DE69107053T2 (de) * 1991-03-15 1995-09-28 Conti Florentia Srl Nadelauswahlvorrichtung für Rundstrickmaschine, insbesondere für Strümpfe.
CZ280577B6 (cs) * 1991-12-30 1996-02-14 Uniplet, A.S. Okrouhlý pletací stroj
DE19822862C2 (de) * 1998-05-22 2001-05-17 Sipra Patent Beteiligung Strickmaschinennadel und damit ausgerüstete Strickmaschine
EP0961393A1 (de) * 1998-05-28 1999-12-01 Sulzer Rüti Ag Linearmotor für eine Textilmaschine sowie Vorrichtung mit einem Linearmotor und Webmaschine mit dieser Vorrichtung

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
DE1804350A1 (de) * 1967-10-24 1970-05-14 Lebocey & Cie Georges Verfahren und Vorrichtung zum Auswaehlen der Stricknadeln oder der Strickhilfsmittel auf Strickmaschinen und mit dieser Vorrichtung versehene Strickmaschine
DE1760710A1 (de) * 1968-06-22 1971-12-30 Terrot Soehne & Co C Schaltmagnet fuer Rundstrickmaschinen
GB1281391A (en) * 1969-02-25 1972-07-12 Bentley Machine Dev Company Lt Improvements in needle operating means in knitting machines
US3620047A (en) * 1969-05-19 1971-11-16 Warner Swasey Co Dial mechanism for knitting machine
US3812691A (en) * 1969-10-07 1974-05-28 Terrot Soehne & Co C Jack and needle actuator for a circular knitting machine
CH571602A5 (enrdf_load_stackoverflow) * 1973-02-28 1976-01-15 Junberca Etabl Sa
JPS5421466B2 (enrdf_load_stackoverflow) * 1973-08-15 1979-07-31
DE2424190A1 (de) * 1974-05-17 1975-12-18 Erich Ribler Elektrisch gesteuerte mustervorrichtung an einer rundstrickmaschine
DE2519896C3 (de) * 1975-05-03 1980-11-06 Mayer & Cie Gmbh & Co, 7470 Albstadt Elektrisch gesteuerte Nadelauswahlvorrichtung für Strickmaschinen
DE2844135C2 (de) * 1978-10-10 1982-09-30 Universal-Maschinenfabrik Dr. Rudolf Schieber Gmbh & Co Kg, 7081 Westhausen Elektrisch gesteuerte Auswahlvorrichtung für die Nadeln einer Flachstrickmaschine
DE3232471A1 (de) * 1981-09-08 1983-03-24 Edouard Dubied & Cie. S.A., 2108 Couvet, Neuchâtel Strickmaschine mit elektromagnetischer wahl der nadeln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066219A1 (de) 2008-12-11 2010-06-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Strickmaschine zur herstellung von mit mustern versehenen strickwaren und dafür bestimmtes nadelbett
DE102008061699A1 (de) 2008-12-11 2010-06-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Strickmaschine zur Herstellung von mit Mustern versehenen Strickwaren

Also Published As

Publication number Publication date
DE3874095D1 (de) 1992-10-01
KR890010323A (ko) 1989-08-08
CS275403B2 (en) 1992-02-19
DD283658A5 (de) 1990-10-17
EP0319007A1 (de) 1989-06-07
CH673664A5 (enrdf_load_stackoverflow) 1990-03-30
JPH01306660A (ja) 1989-12-11
US4875347A (en) 1989-10-24
ES2035231T3 (es) 1993-04-16
CS793988A2 (en) 1990-03-14
RU2018548C1 (ru) 1994-08-30
JP2927436B2 (ja) 1999-07-28

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