EP0544527B1 - Warp control apparatus for a loom - Google Patents

Warp control apparatus for a loom Download PDF

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Publication number
EP0544527B1
EP0544527B1 EP92310812A EP92310812A EP0544527B1 EP 0544527 B1 EP0544527 B1 EP 0544527B1 EP 92310812 A EP92310812 A EP 92310812A EP 92310812 A EP92310812 A EP 92310812A EP 0544527 B1 EP0544527 B1 EP 0544527B1
Authority
EP
European Patent Office
Prior art keywords
piezo
end portion
finger
electric body
electric
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
EP92310812A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0544527A1 (en
Inventor
Chiharu Watanabe
Sadao Saito
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.)
Wac Data Service Co Ltd
Original Assignee
Wac Data Service Co Ltd
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 Wac Data Service Co Ltd filed Critical Wac Data Service Co Ltd
Publication of EP0544527A1 publication Critical patent/EP0544527A1/en
Application granted granted Critical
Publication of EP0544527B1 publication Critical patent/EP0544527B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/20—Electrically-operated jacquards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth

Definitions

  • the present invention relates to a warp control apparatus for a loom, and more particularly to a warp control apparatus for a loom which is used when a pattern is formed on a fabric by controlling warps.
  • the general principle of a loom is as follows.
  • warp yarns are passed through a heald and divided into two groups by an up-and-down movement of the heald to form a shed, into which a filling yarn is inserted by a shuttle.
  • the filling yarn is then pressed to a cloth fell, followed by forming another shed of the warp yarns, into which the filling yarn is inserted, and thus the weaving proceeds.
  • Shuttleless looms are also proposed in which no shuttle is used and a jet stream of air or water is used to insert a filling yarn into a shed.
  • a loom which is well known which is constructed so as to use a card perforated according to a pattern proposed by a jacquard machine to pull up only hooks corresponding to perforations of the card and pull up through harness cords only warp yarns linked to those hooks, thereby forming a shed between the pulled-up warp yarns and warp yarns remaining in their original positions.
  • looms using electromagnets for the formation of the shed have been proposed.
  • a heald rod retention device 50 is provided with a pair of solenoids 51, one of which forms a south pole and the other of which forms a north pole.
  • solenoids 51 are excited to serve as electromagnets, an upper portion of a heald rod 52 is bent by magnetic attraction, and an aperture 53 thereof is brought into engagement with a hook portion 54 formed on the heald rod retention device 50, thereby retaining the heald rod 52 in a lifted state.
  • the aperture 53 is not brought into engagement with the hook portion 54. Accordingly, an end portion of the reciprocating heald rod 52 can be selectively engaged for retention.
  • the numeral 55 designates terminals
  • the numeral 56 designates lead wires
  • the numeral 57 designates a pole piece.
  • a machine as shown in Fig. 10 is also proposed.
  • the numeral 61 designates solenoids
  • the numeral 62 designates a pulley
  • the numeral 63 designates a heald
  • the numeral 64 designates a knife
  • the numeral 65 designates a fixing stand
  • the numeral 66 designates a hook portion.
  • the heald 63 is suspended from the pulley 62.
  • the heald 63 does not go down.
  • the heald 63 goes down. Namely, in this machine, the heald 63 is selected by the action of the solenoid 61 and the up-and-down movement of the pulley 62.
  • the machine using the pulley is intended to accelerate the response speed by the use of the pulley.
  • this machine similarly this machine has a limitation on the accelerating of its response speed, arising from the functions of the electromagnet itself.
  • a warp control apparatus for a loom having a control rod retention device for selective engagement and retention of an end portion of a reciprocating control rod comprises a finger provided with a hook portion or an aperture which can be selectively brought into engagement with the end portion of said control rod to retain it and a piezo-electric body having a piezo-electric element, the upper end portion of said piezo-electric body is movably supported on said control rod retention device by an adjustable offsetter and the lower end portion thereof is movably connected to said finger, and an intermediate portion between the upper end portion of said piezo-electric body and the lower end portion thereof is fixed to a rotatable member rotatably mounted on said control rod retention device.
  • the present invention thus provides a piezo-electric warp control apparatus which eliminates the above-mentioned disadvantages of the prior-art machines, and which is high in response speed, little in heat generation, low in power consumption and can be miniaturized.
  • Another advantage of the present invention is the provision of a warp control apparatus having a characteristic piezo-electric system.
  • Fig. 1 is a perspective view showing a principal part of embodiment of the present invention for illustrating engagement for retention of a control rod retention device with a control rod
  • Fig. 2 is a cross sectional view showing part of the control rod retention device
  • Fig. 3(A) is a vertical sectional view taken along the center line of a principal part of the device shown in Fig. 2
  • Fig. 3(B) is a cross sectional view showing a piezo-electric body.
  • a cylindrical member 3 is attached to an upper end portion of the piezo-electric body 2 of the control rod retention device 1.
  • Fig. 4 is a perspective view showing an example of the cylindrical member 3. As is shown in Fig. 4, the cylindrical member 3 is axially provided with a slot 30A, into which one end portion of the piezo-electric body 2 is inserted and fixed.
  • the cylindrical member 3 is retained in a groove 7 of an offsetter 6 secured to an offset plate 4 by means of bolts 5, and rotatable in the groove 7.
  • the upper end portion of the piezo-electric body 2 is therefore movable as indicated by the arrows in Fig. 3.
  • the numeral 8 designates a washer.
  • bolt holes are formed in the offset plate 4.
  • a lower end portion of the piezo-electric body 2 is also fitted with a cylindrical member 8 similar to the above-mentioned cylindrical member 3, and the cylindrical member 8 is inserted for connection in an open end portion 90 of an upper end portion of a finger 9.
  • the cylindrical member 8 is movable in the open end portion 90 of the finger 9.
  • the finger 9 is provided with a hole formed in the transverse direction of the finger on the side opposite to the open end portion 90. As is shown in Figs. 2 and 3, a pin 10 is inserted into the hole of the finger 9, thereby fixing the finger 9 to a frame 11. A face plate 12 is attached to a lower end of the frame 11 by means of a bolt 13. As is shown in Fig. 3, the strip-like finger 9 is connected to the rectangular piezo-electric body 2 in alignment (in the same direction). A lower end portion of the finger 9 is provided with a hook portion 91 which can be selectively brought into engagement with an end portion (upper end portion) of a control rod to retain it.
  • the lower end portion of the finger 9 may be provided with an aperture which can be selectively brought into engagement with the upper end portion of the control rod to retain it, in the place of the hook portion 91.
  • the finger 9 is formed as short as possible in order to lighten it to expedite its operation.
  • the finger 9 Is preferably provided with a through hole 92 as is shown in Figs. 2 and 3.
  • the hook portion 91 does not come into engagement with the aperture 140 opened at the upper end portion of the control rod 14, the control rod 14 is retained as it is.
  • the aperture 140 is formed at the end portion (upper end portion) of the control rod 14.
  • a hook portion may be formed instead of the aperture, and these may be used in combination.
  • the lower end portion of the finger 9 is protruded from an opening opened at the face plate 12, as is shown in Fig. 2.
  • the opening is formed so as to have such a size that the finger 9 can perform the above-mentioned movement therethrough.
  • a side wall surface of the opening of the face plate 12 serves as a stopper for the finger 9.
  • the finger 9 is formed of, for example, a metal, similarly with a plate of the piezo-electric body 2 described below.
  • the finger 9 is formed so as to be a long narrow strip-like thin plate having a thickness of, for example, about 1 mm, but is not required to be uniform in thickness.
  • the lower end portion thereof may be formed thicker in a tapered shape in order to cushion the impact produced by collision with the control rod 14.
  • the response speed of the finger 9 is increased with a decrease in thickness thereof.
  • the finger 9 may be formed in a tapered shape from one end portion thereof to the other end portion thereof, whereby the finger 9 can be reduced in weight and more improved in response speed.
  • FIG. 5 is a cross sectional view showing an example of the rotatable member 16 used in this embodiment.
  • the rotatable member 16 is provided with a through slot 160 having a size of such a degree that the piezo-electric body 2 can be inserted therein, as is shown in Fig. 5.
  • the piezo-electric body 2 is inserted into the through slot 160 of the rotatable member 16, thereby fixing the piezo-electric body 2 to the rotatable member 16.
  • Both ends of the rotatable member 16 are rotatably supported by means of screws inserted into holes formed in the bracket 15.
  • the piezo-electric body 2 is securely fixed to an inner surface of the through slot 160 of the rotatable member 16 by molding or an adhesive.
  • the rotatable member 16 is movable with the operation of the piezo-electric body 2 not to disturb the bending movement of the piezo-electric body 2. It is important where is the intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2 fixed to the rotatable member 16.
  • the position at which the intermediate portion is fixed to the rotatable member 16 serves as a fulcrum of the bending movement of the piezo-electric body 2. As this position approaches the finger 9, the finger 9 is increased in speed, decreased in amplitude, increased in torque, and reduced in voltage.
  • the position is selected at an approximately intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2.
  • the piezo-electric body 2 used in the present invention comprises a plate 200 and a pair of piezo-electric elements (piezo-electric sheets) 210 attached to the plate 200, as is shown in Fig. 3(B).
  • cavity (space) portions may be formed on the plate 200 to bond the piezo-electric elements 210 therein.
  • Such formation of the cavity portions reduces the weight of the plate 200, which results in easy bending of the plate 200. Accordingly, when the voltage (pulse) is applied to the piezo-electric elements 210, the plate 200 can be bent at a low voltage.
  • the piezo-electric elements 210 can be bonded to the plate 200, for example, by the use of an adhesive such as an epoxy adhesive.
  • piezo-electric element 210 Any kind of piezo-electric element may be used as the piezo-electric element 210, as long as it has an inverse piezo-electric effect.
  • ceramic piezo-electric elements formed of barium titanate or the like are preferably used, because the piezo-electric elements having stable qualities can be commercially provided in a large amount. The thinner the piezo-electric elements 210 are, the higher the electric field can be elevated. It is therefore preferred to use the piezo-electric elements having a thickness of about 100 to about 200 ⁇ m and formed in a shape elongated in the longitudinal direction of the plate 200.
  • Paste for electrodes is baked on both faces of the piezo-electric element 210, and lead wires 230 are connected to the electrodes 220, respectively (see Fig. 7(A). The other ends of these lead wires 230 are provided with a connector 240.
  • the above-mentioned plate 200 is formed of, for example, a metal.
  • the two piezo-electric elements 210 are bonded to the plate 200.
  • a pair of piezo-electric elements may be directly bonded to each other without using a plate.
  • a connecting substrate 18 is joined to the offset plate 4 through an insulating plate 17, and connectors 19 and 20 are connected to the connecting substrate 18.
  • the connector 19 is connected to the connector 240 elongated from the above-mentioned piezo-electric body 2, and a controller (not shown in the drawing) is connected to the connector 20.
  • Pulses are applied from the controller to each piezo-electric element 210.
  • the controller is a device for memorizing a pattern knitting procedure and applying pulses to a plurality of piezo-electric elements on the basis of the memorized pattern knitting procedure.
  • a controller for an electromagnetic heald apparatus can be employed as such a device. Since the structure thereof is well known in the art, a further detailed description will be omitted.
  • the piezo-electric body 2 is bent around the intermediate fulcrum provided with the rotatable member 16 on the basis of the pulses thus applied from the controller, and the finger 9 moves based on the pattern knitting procedure memorized in the controller.
  • Figs. 7(A) to 7(C) show further details of the operation of the control rod retention device and the control rod shown in Fig. 1.
  • Fig. 7(A) shows a state in which the hook portion 91 of the finger 9 is in meshing engagement with the aperture 140 of the control rod 14
  • Fig. 7(B) is a cross sectional view of Fig. 7(A)
  • Fig. 7(C) shows a state in which the engagement is released.
  • a lower end portion of the control rod 14 is provided with a hook portion 141, and the hook portion 141 is connected to a heald 63, though not shown in the drawings.
  • control rod retention devices 1 A large number of control rod retention devices 1 are arranged as is shown in Fig. 8. Each of the control rod retention devices 1 controls each of the control rods 14.
  • the control rod retention device 1 used in the warp control apparatus of the present invention is actuated by the piezo-electric system.
  • the piezo-electric body 2 executes the bending movement. Since the finger 9 is connected to the piezo-electric body 2, the finger 9 is moved following the bending movement of the piezo-electric body 2.
  • the finger 9 is provided with the hook portion 91 or the aperture, so that the finger 9 is brought into engagement with the control rod 14 similarly provided with the aperture 140 or the hook portion.
  • the finger 9 When the voltage (pulse) is not applied to the piezo-electric elements of the piezo-electric body, the finger 9 is not brought into engagement with the control rod 14 to keep them apart. In this manner, the finger 9 can be selectively brought into engagement with the control rod 14 to retain it.
  • the control rod is operatively associated with the heald to control the heald, thereby controlling the warp yarn.
  • high cycle pulses can be applied to the piezo-electric elements thereof because of their high response speed, and the heald operation can be carried out at a rotation speed at least twice that of the conventional apparatus using electromagnets.
  • the piezo-electric body 2 used in the present invention is made up of the thin plate 200 and the piezo-electric elements 210.
  • the size of the apparatus itself can therefore be more reduced, compared with the conventional apparatus having solenoids utilizing electromagnets.
  • the conventional apparatus utilizing electromagnets is very low in power consumption efficiency.
  • the power is almost dissipated as heat, and the power consumption becomes large.
  • the heald apparatus of the present invention according to the piezo-electric system scarcely produces heat, and is markedly reduced in power consumption.
  • the upper end portion thereof is movably supported in a groove 7 of the offsetter 6, the lower end portion thereof is movably connected to the finger 9, and the intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2 is inserted in the rotatable member 16 rotatably mounted on the retention device.
  • the upper end portion and the lower end portion of the piezo-electric body 2 are movable following the bending movement of the piezo-electric body 2 so as not to disturb the bending movement.
  • the rotatable member 16 is rotated so as not to disturb the bending movement.
  • the intermediate portion of the piezo-electric body 2 is supported by the rotatable member 16 so as to have the intermediate fulcrum. Accordingly, the speed of the heald operation can be more improved, the lifetime of the piezo-electric body can be prolonged, and the applied voltage can be more reduced.
  • the finger 9 is connected to the rectangular piezo-electric body 2 in alignment (in the same direction). In this respect, it is considered to attach the finger 9 perpendicularly to the piezo-electric body 2 made up of the plate and the piezo-electric elements. In this case, however, the width of the piezo-electric body 2 becomes wide, which results in enlargement of the apparatus in size.
  • the heald rod retention devices 1 are arranged in large numbers, as is described in Japanese Patent Unexamined Publication No. 59-199833/1984, so that it is important to miniaturize the devices.
  • the finger 9 is also considered to attach the upper end portion of the finger 9 to the surface of the piezo-electric element 210 bonded to the plate 200.
  • the finger 9 is overlapped on the piezo-electric body 2 comprising the plate 200 and the piezo-electric elements bonded thereto, which also results in enlargement of the apparatus in size.
  • the load of the finger 9 is easily applied to the piezo-electric element 210, and when the voltage is applied to the piezo-electric element 210 to execute the bending movement, the bending movement is disturbed. This also produces the danger of destroying the piezo-electric element 210 at the position to which the finger 9 is attached, when the apparatus is used for a long period of time.
  • the present inventor accidentally pressed the surface of the piezo-electric element 210, and discovered that the operation speed of the finger 9 was significantly improved and the torque of a tip of the finger 9 was increased thereby. Based on such information, the piezo-electric body 2 was made to execute the bending movement as easily as possible, and the operation speed of the finger 9 could be significantly improved by inserting the intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2 into the rotatable member 16 rotatably mounted on the bracket 15 to form the intermediate fulcrum.
  • a rod 3B having a slit portion 30B as shown in Fig. 6 may be used in the place of the cylindrical member 3A.
  • the cylindrical member 8 may be replaced in a similar manner.
  • the intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2 is supported by the rotatable member 16 rotatably mounted on the bracket 15 so as to have the intermediate fulcrum.
  • the intermediate portion between the upper end portion and the lower end portion of the piezo-electric body 2 may be securely fitted to an upper surface and/or a lower surface of the rotatable member 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Knitting Machines (AREA)
EP92310812A 1991-11-28 1992-11-26 Warp control apparatus for a loom Expired - Lifetime EP0544527B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP337964/91 1991-11-28
JP3337964A JPH07100895B2 (ja) 1991-11-28 1991-11-28 織機たて糸制御装置

Publications (2)

Publication Number Publication Date
EP0544527A1 EP0544527A1 (en) 1993-06-02
EP0544527B1 true EP0544527B1 (en) 1997-05-02

Family

ID=18313654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92310812A Expired - Lifetime EP0544527B1 (en) 1991-11-28 1992-11-26 Warp control apparatus for a loom

Country Status (4)

Country Link
EP (1) EP0544527B1 (ko)
JP (1) JPH07100895B2 (ko)
KR (1) KR930010270A (ko)
CN (1) CN1026713C (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259526A (en) * 1991-09-11 1993-03-17 Lucas Ind Plc Heald retention mechanism for loom
DE4418714C1 (de) * 1994-05-28 1995-06-22 Mayer Textilmaschf Kettenwirkmaschine mit wenigstens einer Legebarre und Austauschelement für eine solche Kettenwirkmaschine
EP0784349B1 (en) * 1996-01-11 2005-06-01 Wac Data Services Co. Ltd. Stacked piezoelectric actuator and method of operation
BE1010134A3 (nl) * 1996-04-10 1998-01-06 Wiele Michel Van De Nv Gaapvormingsinrichting voor een textielmachine.
IL119727A (en) * 1996-12-01 2000-06-29 Shenkar College Textile Tech Electrically controlled warp selection apparatus in looms
GB9820661D0 (en) * 1998-09-23 1998-11-18 Bonas Machine Co Selector
IT1304701B1 (it) * 1998-12-11 2001-03-28 Vamatex Nuova Spa Attuatore ad effetto piezoelettrico in particolare per l'applicazionenelle macchine tessili
CN2476569Y (zh) * 2001-04-02 2002-02-13 张海林 提花机的提综控制装置
DE202004015676U1 (de) * 2003-09-20 2005-05-04 Piegeler, Gerhard Koppelungsvorrichtungen und HFA-und FA-Elemente für die Textiltechnik

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3705738C2 (de) * 1987-02-23 1995-01-19 Siemens Ag Stellelement mit einem Piezobiegeschwinger zur Nadelsteuerung in Jacquard- und Jacquarette-Webmaschinen
JPH0694619B2 (ja) * 1988-10-05 1994-11-24 ワツクデータサービス株式会社 編機用選針装置

Also Published As

Publication number Publication date
JPH05148732A (ja) 1993-06-15
KR930010270A (ko) 1993-06-22
JPH07100895B2 (ja) 1995-11-01
CN1026713C (zh) 1994-11-23
CN1074254A (zh) 1993-07-14
EP0544527A1 (en) 1993-06-02

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