EP0964092A2 - Dispositif modulaire pour la sélection piezoélectrique d'éléments de commande, comme les aiguilles d'un métier à tricoter ou similaire - Google Patents

Dispositif modulaire pour la sélection piezoélectrique d'éléments de commande, comme les aiguilles d'un métier à tricoter ou similaire Download PDF

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Publication number
EP0964092A2
EP0964092A2 EP99110768A EP99110768A EP0964092A2 EP 0964092 A2 EP0964092 A2 EP 0964092A2 EP 99110768 A EP99110768 A EP 99110768A EP 99110768 A EP99110768 A EP 99110768A EP 0964092 A2 EP0964092 A2 EP 0964092A2
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EP
European Patent Office
Prior art keywords
pins
actuators
bushes
levers
printed
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.)
Granted
Application number
EP99110768A
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German (de)
English (en)
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EP0964092B1 (fr
EP0964092A3 (fr
Inventor
Mario Gaiardo
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.)
Matrix SpA
Original Assignee
Matrix SpA
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Publication date
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Publication of EP0964092A3 publication Critical patent/EP0964092A3/fr
Application granted granted Critical
Publication of EP0964092B1 publication Critical patent/EP0964092B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D04B15/66—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 modular device for piezoelectric selection of control elements, such as the needles of a knitting machine or similar.
  • Knitting machines and similar normally comprise a number of parallel needles carried by a support movable back and forth parallel to the needles. Depending on the knitting pattern, the needles are selected to move or not with the support by means of a corresponding number of selection levers. Each lever is activated by a corresponding actuator to assume either of two positions, in which an appendix of the lever is engaged or not by the respective needle; and the levers are normally arranged to form a module enclosed in a respective casing for high-density packing the levers and respective actuators.
  • actuators of the above type have been proposed in which the actuator is piezoelectric with one end fixed to a respective base and the other end connected in articulated manner to the respective selection lever.
  • Each actuator carries a central electrode and two lateral electrodes, which are connected to a drive circuit via an output connector.
  • a modular device for piezoelectric selection of control elements which comprises a number of selection levers rotating about a corresponding number of parallel pivots; a number of piezoelectric actuators, each having one end connected to one of said levers and another end fitted to a corresponding base, each of said actuators being energizable to selectively cause the corresponding lever to effect a given travel between a rest position in which the control element is not selected, and a work position in which the control element is selected; and a casing for said levers, said actuators and said bases; and which is characterized by comprising adjusting means carried by said casing and for adjusting the relative position between said actuators and said levers.
  • each of said actuators carries a central electrode and two lateral electrodes; said electrodes being defined by rigid parallel first pins fittable to corresponding bushes carried by an adapter to electrically connect said electrodes to a drive circuit for driving said actuators.
  • said adapter comprises a multiple connector defined by rigid parallel second pins arranged differently from said first pins; said first pins and said second pins being connected to one another by means of at least one printed-circuit board to which said bushes are fitted.
  • Number 5 in Figure 1 indicates as a whole a modular device for piezoelectric selection of a number of control elements, e.g. the needles of a knitting machine or similar.
  • Device 5 comprises a number of, e.g. eight, selection levers 6 aligned with one another and rotating about a number of parallel, equally spaced pivots 7.
  • each lever 6 comprises a cam selection element 8 made of hardened steel and which is engaged by a corresponding needle 9 of the machine.
  • Each element 8 is molded to one end of a bar 10 made of plastic material, preferably thermoplastic resin with a low coefficient of friction and of high resistivity.
  • the thermoplastic resin may be filled with glass fibers, and may comprise, for example, Nylon (registered trademark) or PPS with a Teflon (registered trademark) filler.
  • Bar 10 has a hole 11 in which is inserted for rotation a fixed pin 12.
  • device 5 comprises a metal frame 13, e.g. of light alloy or extruded aluminium, worked to comprise two top cross members 14 and two bottom cross members 15 connected by two sides 29.
  • Pins 12 are force-fitted inside respective holes formed in cross members 14 and equally spaced 2 to 10 mm, e.g. 5 mm, apart.
  • the end of bar 10 opposite the end fitted with element 8 comprises two fork-shaped appendixes 16, 17 between which is engaged in articulated manner one end of a piezoelectric actuator 18.
  • Each actuator 18 ( Figures 10a and 10b) is defined by a central metal plate 19 fitted with two rectangular layers 20 and 21 of a ceramic, e.g. bimorph ceramic, which deforms when energized electrically; and the two layers 20 and 21 each have an insulating layer with an opening by which to connect layers 20 and 21 electrically, so that each actuator 18 comprises a central electrode 19' carried by an appendix 39 (see also Figure 3) of plate 19, and two lateral electrodes 20', 21' formed by the openings in the respective insulating layers of layers 20 and 21.
  • a ceramic e.g. bimorph ceramic
  • actuator 18 opposite the end engaging appendixes 16 and 17 is inserted inside a slot 22 ( Figure 4) in a base 23 made of plastic material and to which the end of the actuator is fixed, for example, by means of glue.
  • Base 23 is prismatic in shape for high-density packing, and comprises two pairs of appendixes 24 (Figure 3) which engage respective slots 25 in two walls 26 and 28 of stainless steel or plastic material. Walls 26 and 28 are fitted to the two sides 29 by means of four screws 30 ( Figure 1) to form, with frame 13, a casing 31 housing levers 6, actuators 18 and bases 23.
  • Casing 31 is closed at the top by a sheet metal comb 27 connected to casing 31 by means of four screws 33; comb 27 comprises a number of slots 34 in which are inserted cam elements 8 of selection levers 6; and the width of slots 34 determines the travel of elements 8 between two limit positions which may be from 1 to 3 mm apart.
  • lever 6 on the left is shown by the continuous line in a work position in which element 8 engages respective needle 9, and by the dash line in a rest position in which needle 9 is not engaged by element 8; and the other seven levers 6 are shown in the central, i.e. neutral, position corresponding to the nonenergized state of actuator 18.
  • the bottom end of casing 31 is closed by a support or multiple connector 35 made of insulating material and having two appendixes 36 connected to sides 29 of frame 13 by means of two screws 37.
  • the three electrodes 19', 20', 21' of each actuator 18 are connected electrically to three rigid pins, i.e. a central pin 38 (on the left in Figure 3) welded to central electrode 19', and two lateral pins 40 and 41 (center and right in Figure 3) welded to lateral electrodes 20' and 21'.
  • Pins 38, 40, 41 are welded in known manner to electrodes 19', 20', 21' at three openings 42 in base 23, and project from the bottom of base 23 by respective portions 43 of equal length. Therefore, the three groups of eight pins 38, 40, 41 of actuators 18 are arranged in three separate rows, the pins 38, 40 and 41 in each row being spaced with the same spacing as actuators 18.
  • Actuators 18 are driven by an electronic circuit 75 ( Figure 9) described in detail later on, and which requires that lateral pins 40 and 41 be connected electrically to two common conductors, and that central pins 38 be electrically connected singly.
  • Multiple connector 35 provides for connecting device 5 to the electronic drive circuit, and comprises a series of fifteen identical pins 46 (see also Figure 2) molded to the body of connector 35 so as to project upwards.
  • Pins 46 are arranged in two rows with a predetermined or standard spacing, for example, of 2.5 to 3.5 mm, and, in each row, with a standard spacing, for example, of 2 to 3 mm, and are protected by a metal shield 45 connected to connector 35 by means of bolts 44.
  • Pins 38, 40, 41 are connected electrically to pins 46 by an adapter indicated as a whole by 32 and comprising at least one printed-circuit board 47 having a number of bushes 48 for receiving the ends of pins 38, 40, 41.
  • Bushes 48 are of the type used to connect microchips on printed circuits, with an inside diameter of about 0.5 mm, and are welded individually to board 47 in known manner.
  • Bushes 48 corresponding to pins 40 and 41 are connected electrically by two corresponding printed-circuit conductors 49 and 50 ( Figure 5), and bushes 48 corresponding to pins 38 are insulated electrically from one another.
  • Board 47 with bushes 48 ( Figures 3 and 4) is glued or ultrasonically welded to a support 51 made of plastic material and comprising a number of holes 52, each for housing a bush 48, and a bottom edge 53 for engaging an edge 54 of connector 35.
  • Each of bushes 48 for the row of central pins 38 comprises a downward-projecting pin 55, whereas only one of bushes 48 for each row of lateral pins 40 and 41 comprises a projecting pin 55.
  • Adapter 32 also comprises a second printed-circuit board 56 having a number of bushes 58 ( Figure 3) identical to the bushes 48 with no projecting pins 55; connector 35 comprises a number of dead holes 57 for housing bushes 58; board 56 is fitted to connector 35 in the same way as board 47 to support 51; and bushes 58 of board 56 may be fifteen in number, if all the pins 46 of multiple connector 35 are to be used. In the case of a selection device with eight actuators 18, however, ten bushes 58 for receiving pins 55 of bushes 48 are sufficient.
  • the top ends of pins 46 fit through board 56 and are welded on top to respective pads on the printed circuit.
  • the printed circuit comprises two conductors 59 and 61 ( Figure 6) for connecting the two bushes 58 of the rows of lateral pins 40 and 41 to the pads of two corresponding pins 46; a number of conductors 62 for connecting the bushes 58 of the row of central pins 38 (at the top in Figure 6); and a ground pad 60 to which is welded a cable 70 (see also Figure 4) electrically contacting frame 13.
  • Ground pad 60 is connected by a conductor 63 to the pad of a further pin 46.
  • the two sides 29 ( Figure 1) of frame 13 are connected to walls 26 and 28 by manual adjusting means comprising an eccentric pin 64 pivoting eccentrically on one of sides 29.
  • the eccentricity of pin 64 may be 0.1 to 1 mm, and is preferably 0.3 mm; each of the two walls 26, 28 comprises a hole 69 engaged by pin 64; pin 64 comprises a head 65 engageable by a screwdriver; and rotation of pin 64 may be partially prevented by applying adhesive resin between pin 64 and hole 69.
  • Two holes in sides 29 are fitted with two elements or pins 66 projecting on both sides and each engaging a pair of guide slots 67 provided on walls 26 and 28. Slots 67 enable frame 13 to be moved with respect to walls 26, 28 and perpendicularly to actuators 18 to adjust at-rest alignment of actuators 18 with respect to selection levers 6.
  • walls 26 and 28 are provided with holes 68 of such a diameter as to permit adjustment before tightening screws 30.
  • Modular device 5 for selecting needles 9 is assembled and adjusted as follows.
  • bars 10 of levers 6 are placed between top cross members 14; pins 12 are inserted inside holes 11 in bars 10 and fitted into cross members 14 of frame 13; cam elements 8 are inserted inside slots 34 on comb 27; comb 27 is fitted to frame 13 by means of screws 33; and wall 28 is fitted to sides 29 of frame 13 without tightening down respective screws 30.
  • Actuators 18 are then inserted inside frame 13 by engaging two appendixes 24 of each base 23 inside slots 25 in wall 28, and the free end of each actuator 18 between appendixes 16 and 17 of respective bar 10; wall 26 is fitted to frame 13 so that the other two appendixes 24 of each base 23 are inserted inside slots 25 in wall 26; and wall 26 is fitted to sides 29 without tightening down respective screws 30.
  • board 47 with bushes 48 is first fitted to support 51 ( Figure 4); board 56 with pins 46 and bushes 58 is fitted to connector 35; shield 45 for protecting pins 46 is fitted to connector 35; and support 51 is connected to connector 35 by inserting pins 55 of bushes 48 on board 47 inside bushes 58 on board 56 so that edge 53 of support 51 mates with edge 54 of connector 35.
  • Support 51 may also be glued or welded to connector 35.
  • connector 35 and support 51 The assembly defined by connector 35 and support 51 is then inserted between sides 29 of frame 13 by inserting pins 38, 40, 41 of actuators 18 inside bushes 48 on board 47 so that appendixes 36 of connector 35 rest against sides 29 of frame 13; and connector 35 is fitted to sides 29 by means of screws 37.
  • actuators 18 With respect to selection levers 6 is adjusted by engaging head 65 ( Figure 1) of eccentric pin 64 with a screwdriver, and appropriately rotating eccentric pin 64.
  • adjustment may be controlled by means of mechanical, electrical or electronic measuring devices. In which case, at least one of actuators 18 is energized to move the actuator from the neutral position to one and then the other of the two limit positions, and the displacement of element 8 is controlled on a monitor. Pin 64 must be rotated so that, as far as possible, element 8 moves by the same amount in both directions. Adjustment may also be controlled with reference to two or more actuators 18 to determine an average as similar a movement as possible of elements 8 in both directions. Once the adjustment has been made, screws 30 are tightened down to fix walls 26, 28 to frame 13.
  • selection device 5 comprises a casing 31' housing sixteen piezoelectric actuators 18 equally spaced, for example, 4 mm apart.
  • a bottom portion 76 of casing 31' houses electronic circuitry and the electric connections both to actuators 18 and to an electronic governor of the machine.
  • each actuator 18 is connected directly to a terminal 77 contacting central electrode 19' of plate 19, and to two terminals 77 contacting lateral electrodes 20' and 21' of the two layers 20 and 21 of actuator 18, in the same way as pins 38, 40, 41 in Figure 3.
  • the three terminals 77 are carried by three cables 80 ( Figure 8) terminating at a connector 81 welded to a printed-circuit board 82, which has drive circuits 75 (see also Figure 9), and an output connector 83 for connection to the governor of the machine.
  • the base 23' of each actuator 18 is hinged by two pins 84 to two holes in walls 26', 28' of casing 31'.
  • one end 86 of base 23' has a groove 87 housing an eccentric pin 88 rotating on walls 26', 28' and having a head 89 engageable by a screwdriver.
  • Each base 23' also has a lock screw 90 for securing base 23' to casing 31' following adjustment, which is made individually for each base 23' in the same way as frame 13 in the Figure 1-6 embodiment.
  • the distance between groove 87 and pin 84 is substantially equal to the distance between pin 84 and fork-shaped appendixes 16, 17 of bar 10 of lever 6, so that, with a 0.3 mm eccentricity of pin 88, the articulated joint between actuator 18 and lever 6 may be moved 0.3 mm, which is sufficient for any adjustment of the relative position between actuator 18 and the corresponding lever 6.
  • Conventional drive circuits of a piezoelectric actuator 18 are normally such that a positive voltage of predetermined value is applied, for example, to electrode 21' to the right of central electrode 19' to move the corresponding selection lever 6 into the rest position ( Figure 10a), and a negative voltage of the same value is applied to electrode 20' to the left of central electrode 19' to move lever 6 into the work position ( Figure 10b).
  • the drive circuit 75 ( Figure 9) of the invention is improved with respect to conventional drive circuits, and provides for connecting the right electrode 21' of actuator 18 permanently to a positive voltage, e.g. +200VDC, while the left electrode 20' is permanently grounded and the central electrode 19' is selectively connected to the positive voltage or grounded (see also Figures 10a and 10b).
  • actuator 18 assumes a neutral position as shown by the dotted line in Figures 10a and 10b.
  • Drive circuit 75 comprises an input IN supplied by the control unit with a command to select needle 9; and an output OUT connected to central pin 38 ( Figure 4) or central terminal 77.
  • Input IN is connected both to a LED cathode K of a solid-state relay 91 and to a network R1, C1; one terminal of capacitor C1 is connected to a logic ground 92; resistor R1 is connected parallel to a diode D1; and the other terminal of capacitor C1 is connected both to resistor R1 and to the input of a latch 93 for regenerating the signal edge.
  • the output of latch 93 is connected via a resistor R2 to a voltage +Vdc (e.g. +5V) and via a resistor R3 to the base of a transistor T1, the emitter of which is grounded; the LED anode A of relay 91 is connected via a resistor R4 to voltage +Vdc; relay 91 has an output collector C connected to positive voltage +200VDC; and the emitter E of relay 91 is connected via a resistor R5 to the collector of transistor T1 and to output OUT.
  • a voltage +Vdc e.g. +5V
  • Adjusting the position of actuators 18 with respect to selection levers 6 comprises adjusting the travel of levers 6 between the rest and work positions defined by the two edges of respective slots 34 of comb 27.
  • curve 74 shows the passage from 0 to +200VDC of the voltage V at central electrode 19' of actuator 18 as a function of time t; and curve 71 shows the displacement of the end of cam element 8 of lever 6 produced by energizing actuator 18, which displacement S is detected by a known, e.g. magnetic, optical or capacitive, sensor.
  • cam element 8 of lever 6 energizing of actuator 18 commences at a first instant t1, and cam element 8 reaches the work position at a second instant t2 with a first delay t2-t1 of about 2-3 ms indicated by 72 in Figure 11.
  • cam element 8 reaches the rest position at a fourth instant t4 with a second delay t4-t3 indicated by 73 in Figure 11.
  • a symmetrical condition, in which first delay 72 equals second delay 73, is the preferred adjustment condition between actuator 18 and the corresponding selection lever 6.
  • eccentric pin 64 ( Figure 1) and eccentric pins 88 ( Figure 7) must be rotated to get as close as possible to the above symmetric condition.
  • the method of adjusting the relative position between at least one selection lever 6 and the corresponding piezoelectric actuator 18 comprises the following steps.
  • a first step wherein actuator 18 is energized as of a first instant t1 to move lever 6 from the rest to the work position; a second step wherein a first delay 72 between first instant t1 and a second instant t2, at which lever 6 reaches the work position, is detected; a third step wherein actuator 18 is deenergized as of a third instant t3 to move lever 6 from the work to the rest position; a fourth step wherein a second delay 73 between third instant t3 and a fourth instant t4, at which lever 6 reaches the rest position, is detected; and a fifth step wherein the position of actuator 18 with respect to lever 6 is adjusted so that first delay 72 equals second delay 73.
  • selection device 5 provides for eliminating various position errors caused by assembly and manufacturing tolerances.
  • method of adjustment by determining the delays of actuator 18, eliminates the need for complex mechanical measurements.
  • device 5 in Figure 1 enables use of a standard connector 35, thus simplifying electrical connection to the drive circuits; adapter 32 between pins 38, 40, 41 of actuators 18 and pins 46 of connector 35 provides for troublefree fitment/removal of adapter 32 to/from device 5; and the structure of casing 31 with frame 13 and two walls 26 and 28 provides for troublefree assembly and disassembly of actuators 18 and levers 6, which may in fact be assembled and disassembled simply using a screwdriver.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP19990110768 1998-06-04 1999-06-04 Dispositif modulaire pour la sélection piezoélectrique d'éléments de commande, comme les aiguilles d'un métier à tricoter ou similaire Expired - Lifetime EP0964092B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98TO000484A ITTO980484A1 (it) 1998-06-04 1998-06-04 Dispositivo modulare di selezione piezoelettrica di elementi di coman- do, ad esempio gli aghi di una macchina tessile.
ITTO980484 1998-06-04

Publications (3)

Publication Number Publication Date
EP0964092A2 true EP0964092A2 (fr) 1999-12-15
EP0964092A3 EP0964092A3 (fr) 2000-09-06
EP0964092B1 EP0964092B1 (fr) 2003-12-17

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EP19990110768 Expired - Lifetime EP0964092B1 (fr) 1998-06-04 1999-06-04 Dispositif modulaire pour la sélection piezoélectrique d'éléments de commande, comme les aiguilles d'un métier à tricoter ou similaire

Country Status (3)

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EP (1) EP0964092B1 (fr)
DE (1) DE69913606T2 (fr)
IT (1) ITTO980484A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1191610A2 (fr) * 2000-09-22 2002-03-27 MATRIX S.p.A. Système de raccordement d'un actionneur piézo-électrique à un support rigide
EP1219741A1 (fr) * 2000-12-27 2002-07-03 Mitsu Tec Co., Ltd. Actionneur dans un dispositif de sélection d'aiguilles pour un métier à tricoter
DE10227532B4 (de) * 2002-06-20 2006-02-23 Groz-Beckert Kg Modul für Textilmaschinen, insbesondere Maschen bildende Maschinen
CN110629384A (zh) * 2019-10-08 2019-12-31 浙江理工大学 一种压电选针器感知执行一体式状态检测系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252335A1 (fr) * 1986-07-08 1988-01-13 LONATI S.p.A. Dispositif pour la sélection d'aiguilles sur un métier à tricoter de manière circulaire, notamment pour tricoter des bas
DE3933149A1 (de) * 1988-10-05 1990-04-12 Wac Data Services Co Ltd Stricknadel-antriebsmechanismus einer strickmaschine
EP0784349A1 (fr) * 1996-01-11 1997-07-16 Wac Data Services Co. Ltd. Organe d'actionnement piezoélectrique laminé
EP0796939A1 (fr) * 1996-03-19 1997-09-24 Precision Fukuhara Works, Ltd Dispositif de sélection d'aiguilles piezo-électrique pour des machines à tricoter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252335A1 (fr) * 1986-07-08 1988-01-13 LONATI S.p.A. Dispositif pour la sélection d'aiguilles sur un métier à tricoter de manière circulaire, notamment pour tricoter des bas
DE3933149A1 (de) * 1988-10-05 1990-04-12 Wac Data Services Co Ltd Stricknadel-antriebsmechanismus einer strickmaschine
EP0784349A1 (fr) * 1996-01-11 1997-07-16 Wac Data Services Co. Ltd. Organe d'actionnement piezoélectrique laminé
EP0796939A1 (fr) * 1996-03-19 1997-09-24 Precision Fukuhara Works, Ltd Dispositif de sélection d'aiguilles piezo-électrique pour des machines à tricoter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1191610A2 (fr) * 2000-09-22 2002-03-27 MATRIX S.p.A. Système de raccordement d'un actionneur piézo-électrique à un support rigide
EP1191610A3 (fr) * 2000-09-22 2002-11-20 MATRIX S.p.A. Système de raccordement d'un actionneur piézo-électrique à un support rigide
EP1219741A1 (fr) * 2000-12-27 2002-07-03 Mitsu Tec Co., Ltd. Actionneur dans un dispositif de sélection d'aiguilles pour un métier à tricoter
US6526784B2 (en) 2000-12-27 2003-03-04 Mitsu Tec Co., Ltd. Actuator in a needle-selecting apparatus for a knitting machine
DE10227532B4 (de) * 2002-06-20 2006-02-23 Groz-Beckert Kg Modul für Textilmaschinen, insbesondere Maschen bildende Maschinen
CN110629384A (zh) * 2019-10-08 2019-12-31 浙江理工大学 一种压电选针器感知执行一体式状态检测系统

Also Published As

Publication number Publication date
DE69913606D1 (de) 2004-01-29
EP0964092B1 (fr) 2003-12-17
ITTO980484A1 (it) 1999-12-04
EP0964092A3 (fr) 2000-09-06
DE69913606T2 (de) 2004-09-23

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