JP2006115665A - Linear driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To move a linear moving member with a high thrust and at an ultra-high speed acceleration and deceleration, in a machine such as a molding machine or the like. <P>SOLUTION: In the linear driving device using a linear motor as the driving source of a linear moving member; the linear motor comprises a stator wound with wiring and a moving element moving linearly relative to the stator, the stator has a plurality of opposing parts with magnetic pole teeth opposing to each other, the plurality of opposing parts have an alternative structure of the magnetic pole teeth of adjacent opposing parts, and a linear moving element with a permanent magnet is arranged between the magnetic pole teeth constituting the opposing parts. The linear driving device has a structure wherein a plurality of linear motors are used to synthesize the linear moving force of the mover of the linear motors to be transmitted to a single linear moving member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear drive device using a linear motor, and in particular, in a machine such as an injection molding machine or a die casting machine, for example, to move a linear moving member with high thrust and ultra high speed acceleration / deceleration. It relates to a suitable technique.

  In a molding machine such as an injection molding machine or a die casting machine, a rotary servo motor and a ball screw mechanism that converts the rotation of the servo motor into a linear motion are used to drive a linear moving member such as a screw or an injection plunger. Is common. However, when a configuration using a rotary servo motor is used, there is an influence of the rotation inertia of the rotation transmission system, and therefore the acceleration / deceleration capability is inevitably about 4G. For this reason, there is a certain limit to shortening the injection filling time.

  In order to increase the acceleration / deceleration capability, a molding machine using a linear motor as a driving source is also known. For example, the applicant of the present application proposes an inline screw type injection molding machine using a linear motor as a driving source for injection filling. (See Patent Document 1).

  In the technique disclosed in Patent Document 1 described above, since a linear motor is used as a drive source for the linear motion of the screw, there is no influence of rotational inertia as in the case of using a rotary servo motor. Acceleration and deceleration of about 8G can be achieved. However, since the linear motor used in Patent Document 1 is a general linear induction motor, it has not been possible to achieve an ultra-high speed acceleration operation or deceleration operation with an acceleration / deceleration capability of about several tens of grams.

Therefore, in order to achieve ultra-high speed acceleration and deceleration operations, the applicant of the present application proposed as a Japanese Patent Application No. 2004-168754 a molding machine that uses a linear motor called a tunnel actuator type as a drive source of a linear moving member. did. With the technique described in Japanese Patent Application No. 2004-168754, acceleration / deceleration of a linearly moving member such as a screw can be realized at 40 G or more.
JP 2004-050632 A

  By the way, in the technique described in Japanese Patent Application No. 2004-168754 described above, since one linear motor is assigned to one linear moving member, there is a limit to increase the thrust. Theoretically, with a tunnel actuator type linear motor, the greater the number of poles, the greater the thrust that can be obtained. This is because it becomes extremely difficult, and thus the increase in the number of poles is naturally limited. Further, when the number of poles is increased, the size of the tunnel actuator type linear motor increases, so that there is a problem that the overall size of the machine becomes longer accordingly.

  The present invention has been made in view of the above points, and an object of the present invention is to make it possible to move a linear moving member with high thrust and ultra high speed acceleration / deceleration in a machine such as a molding machine. is there.

  In order to achieve the above-described object, the present invention provides a linear drive device that uses a linear motor as a drive source for a linear moving member, wherein the linear motor includes a stator around which a winding is wound, and a straight line with respect to the stator. The stator has a plurality of facing portions where the magnetic pole teeth face each other, and the plurality of facing portions have a structure in which the magnetic pole teeth of the adjacent facing portions take a staggered structure, Between the magnetic pole teeth constituting the linear mover having a permanent magnet is arranged, and by using a plurality of the linear motors, the linear moving force of the mover of each linear motor is synthesized, A configuration is adopted in which transmission is made to a single linear moving member.

  The linear motor having the above-described configuration is called a tunnel actuator, and has a structure capable of canceling out a magnetic attractive force generated between the stator (armature) and the mover, so that the stator and the mover are arranged. A sufficient thrust can be obtained with almost no magnetic attraction force, and acceleration / deceleration of 40 G or more can be realized by reducing the weight of the mover. Therefore, with this tunnel actuator type linear motor, for example, by driving an extrusion member (linear movement member) of a melt molding material such as a screw or an injection plunger, injection filling with excellent start-up characteristics up to high speed can be realized. In addition, ultra-rapid deceleration with good response is possible. Further, a plurality of tunnel actuator type linear motors are used for one linear moving member, and the linear moving force of each linear motor is synthesized to extrude a single molten molding material such as a screw or an injection plunger. By driving the member (linearly moving member), a large driving force can be obtained, and even an extruded member made of a melt molding material having a large diameter (cross-sectional area) can be driven with high responsiveness and high speed. Furthermore, by arranging a plurality of linear motors in parallel, it is possible to increase the thrust of linear movement without increasing the size of the machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing a configuration of an injection system mechanism of an inline screw type injection molding machine which is a molding machine according to a first embodiment of the present invention.

  In FIG. 1, 1 is a front holding plate fixed on an injection unit base board (not shown), 2 is a rear holding plate fixed on an injection unit base board (not shown), A heating cylinder with its end fixed to the front holding plate 1, 4 is a nozzle attached to the tip of the heating cylinder 3, and 5 is a screw arranged in the heating cylinder 3 so that it can rotate and move forward and backward. , 6 is a guide bar (tie bar) spanned between the front holding plate 1 and the rear holding plate 2, 7 is a movable body that is inserted and guided by the guide bar 6 and can be moved forward and backward, and 8 A driven pulley 9, which is rotatably held by the moving body 7 and to which the rear end portion of the screw 5 is fixed, is a rotary servomotor for weighing (screw rotation driving) mounted on the moving body 7. The rotary servo Is fixed to the output shaft of over motor 9, a small pulley for transmitting rotation to the driven pulley 8 via the timing belt (not shown).

  Further, 11 and 11 are for injection and back pressure control in which the stator 11a side is fixed / held to the rear holding plate 2 and the movable element 11b side is fixed to the moving body 7 via the connecting bar 12. This is a tunnel actuator type linear motor (for screw back-and-forth control) (in FIG. 1, the configuration of this linear motor is schematically shown for convenience of illustration). In the present embodiment, two linear motors 11 are provided in parallel with the moving body 7 (screw 5), and the linear moving force of the mover 11b of each linear motor 11 is synthesized (added). And is transmitted to the moving body 7 (screw 5).

  Reference numeral 13 denotes a servo driver that drives the rotary servo motor 9 by feedback control, 14 and 14 denote a pair of servo drivers that respectively drive the linear motors 11 by feedback control, and 15 denotes a preset weighing. The system controller provides command values to the servo driver 13 and the paired servo drivers 14 and 14 in accordance with the control conditions and the injection control conditions.

  FIG. 2 is a diagram showing an outline of a configuration example of a tunnel actuator type linear motor used in each embodiment of the present invention including this embodiment. In FIG. 2, 21 and 22 are stators (armatures). In each of the stators 21 and 22, 23 is a magnetic pole, 23a is an upper magnetic pole tooth of the magnetic pole 23, 23b is a lower magnetic pole tooth of the magnetic pole 23, 24 is A magnetic pole, 24a is an upper magnetic pole tooth of the magnetic pole 24, 24b is a lower magnetic pole tooth of the magnetic pole 24, 25 is an iron core, and 26 is a winding wound in the longitudinal direction of the iron core 25. In FIG. 2, reference numeral 27 denotes a mover having a permanent magnet in which N poles and S poles are alternately arranged along the longitudinal direction.

  In the tunnel actuator type linear motor shown in FIG. 2, the upper magnetic pole teeth 23a of the magnetic pole 23 and the lower magnetic pole teeth 24b of the magnetic pole 24 are opposed to each other with a predetermined gap G to form an opposing portion. Similarly, the upper magnetic pole teeth 24a of 24 are opposed to each other with a predetermined gap G to form a facing portion, and the magnetic pole teeth have a staggered structure between the adjacent facing portions. And it has the structure where the needle | mover 27 was arrange | positioned between the magnetic pole teeth which comprise each opposing part.

  In a tunnel actuator type linear motor having such a configuration, when the pole pitch P between adjacent magnetic pole tooth centers is set to a predetermined value and the stator 21 is driven (excited) in the A phase, the stator 22 is When the stator 21 is driven (excited) in the B phase and the stator 21 is driven in the B phase, the stator 22 is driven in the A phase, and the A and B phases are driven alternately in turn by the stators 21 and 22. By switching to, the mover 27 is linearly moved by being given a thrust in a predetermined direction.

  Here, in the adjacent facing portions, as shown in FIG. 3, the directions in which the suction force works are opposite to each other, so that the suction force can be offset to substantially zero as a whole, With this configuration, sufficient thrust can be obtained, and the movable element 27 can be reduced in weight, so that acceleration / deceleration of 40 G or more can be realized.

Since the configuration of such a tunnel actuator type linear motor is known in Patent Document 2 and the like, further detailed description thereof will be omitted. Although FIG. 2 shows an example of two-phase excitation, it is possible to adopt a configuration in which driving is performed by three-phase excitation.
Japanese Patent No. 3395155

  Next, the injection filling operation of the injection molding machine according to the present embodiment will be described taking an optical disk substrate as an example. In the configuration shown in FIG. 1, during the weighing process, the rotary servo motor 9 is driven to rotate by a command from the system controller 15 via the servo driver 13, thereby being driven by a small pulley 10 and a timing belt (not shown). The pulley 8 is rotationally driven, and the screw 5 integrated with the driven pulley 8 rotates in a predetermined direction. By the rotation of the screw 5, the resin material supplied to the rear end side of the screw 5 is transferred forward by the screw feeding action of the screw 5 while being kneaded and plasticized, and the molten resin is stored on the front end side of the screw 5. Accordingly, the screw 5 moves backward. At this time, the two linear motors 11 and 11 are synchronously driven and controlled by the command from the system controller 15 via the servo drivers 14 and 14, whereby the back pressure applied to the screw 5 is controlled, and the screw 5 fall back. When the molten resin for one shot is stored on the tip side of the screw 5, the rotational drive of the screw 5 by the rotary servo motor 9 is stopped.

  On the other hand, at the time of the injection filling process, the two linear motors 11 and 11 are driven in synchronization with each other via the servo drivers 14 and 14 in response to a command from the system controller 15 at an appropriate timing after the completion of the measurement. The integral moving body 7 is rapidly driven forward via the mover 11a and the connecting bar 12, whereby the screw 5 is accelerated rapidly and moved forward, and the molten resin stored on the tip side of the screw 5 is shown in FIG. It is injected and filled in a cavity (not shown) in the mold cavity (not shown). Each linear motor 11 is suddenly decelerated at an appropriate timing at which most of the cavity is filled with the molten resin (the timing of the appropriate advance position of the screw), whereby the screw 5 is decelerated very rapidly, Control is performed so that the screw 5 is advanced and stopped when the molten resin has completely spread into the cavity.

  By the way, in the above-mentioned disk substrate molding, since filling is performed from the center of the disk toward the outer periphery, the filling of the molten resin is performed in accordance with the expansion of the radius in the filling process (so as to increase in proportion to the square of the radius). In order to control the amount, the injection speed is accelerated and uniform filling is performed, and the injection speed is accelerated until the molten resin reaches all corners of the cavity, and when the molten resin reaches all corners of the cavity, Instantly setting the injection speed to 0 (zero) is ideal for achieving good product molding and shortening the molding cycle. A two-dot chain line in FIG. 4 indicates such an ideal injection speed. In FIG. 4, the vertical axis represents the injection speed (screw advancement speed), and the horizontal axis represents the spread tip position of the molten resin in the cavity corresponding to the screw advance position.

  Here, it is technically impossible to instantaneously set the injection speed to 0 (zero) because inertia exists. Therefore, in order to prevent overfilling, it is necessary to reduce the injection speed from a certain point in the course of the filling process. In an injection molding machine using a conventional rotary servo motor, the limit of acceleration / deceleration capability is about 4G due to the effect of rotational inertia, and therefore the deceleration for sudden deceleration is about 4G. Thus, there is a certain limit to shortening the injection filling time. Furthermore, since acceleration performance is also limited, shortening of injection filling time is also limited in this respect. Further, even in a conventional injection molding machine using a linear motor, the deceleration for sudden deceleration is about 10G or less, and thus the rapid deceleration close to the ideal type cannot be performed. The dotted line in FIG. 4 shows the characteristics of the injection speed in an injection molding machine using a conventional rotary servo motor, and the one-dot chain line in FIG. 4 is in an injection molding machine using a conventional linear motor. The characteristics of the injection speed are shown.

  In this embodiment, since the tunnel actuator type linear motor 11 is used as a driving source for injection filling, it is possible to perform acceleration and deceleration with extremely good responsiveness, and extremely rapid deceleration due to deceleration of about several tens of grams. As shown by the solid line characteristics in FIG. 4, acceleration control is performed until most of the cavity is filled with the molten resin, and then the fuel is decelerated very rapidly, and the injection filling operation is performed. Can be stopped extremely rapidly, and thus an injection speed characteristic close to the ideal type can be obtained. Therefore, the injection filling time can be shortened as much as possible, and the optical performance of the optical disc can be improved by performing the injection filling in a very short time without overfilling and at a very high speed (specifically, In other words, variation in birefringence can be suppressed).

  In the present embodiment, the linear movement force of the two tunnel actuator type linear motors 11 is synthesized (added together) to drive the screw 5 linearly, so that a single tunnel actuator type linear motor is used. As compared with the case where the screw 5 is linearly driven at 11, twice the propulsive force can be obtained. Therefore, the present invention can be applied to a model having a large screw diameter (cross-sectional area). For example, a machine for simultaneously molding a plurality of disk substrates in one molding cycle can be easily realized, and mass productivity is increased. Furthermore, a machine for molding a large molded product can be easily realized. Furthermore, by arranging the two linear motors 11 in parallel, the size of the machine is not increased.

Second Embodiment
FIG. 5 is a diagram showing a configuration of an injection system mechanism of a pre-plastic injection molding machine that is a molding machine according to the second embodiment of the present invention.

  In FIG. 5, 31 is a holding block fixed to a support base (not shown), 32 is a first heating cylinder (heating cylinder for plasticization / melting) whose rear end is fixed to the holding block 31, 33 is a screw arranged to be rotatable in the first heating cylinder 32, 34 is rotatably held by the holding block 31, and a driven pulley to which a rear end portion of the screw 33 is fixed. , 35 is a rotary servomotor for metering (screw rotation drive) mounted on the holding block 31, and 36 is fixed to the output shaft of the rotary servomotor 35, and is driven pulley via a timing belt (not shown). 34 is a small pulley that transmits rotation to 34, 37 is a holding block fixed to a support base (not shown), and 38 is a second heating cylinder (shooting gun) with its rear end fixed to the holding block 37. 39 is a nozzle attached to the tip of the second heating cylinder 38, 40 is an injection plunger arranged so as to be able to move forward and backward in the second heating cylinder 38, 41 The movable plates 42 and 42 to which the rear end portion of the injection plunger 40 is fixed are guided and held so as to be able to move forward and backward by an appropriate guide mechanism (not shown), and the stator side thereof is not shown. A pair of parallel-arranged tunnel actuator type linear motors for injection and back pressure control (for screw forward / backward control), which are fixed / held by an appropriate holding member and whose mover side is fixed to a moving plate 41 (For convenience of illustration, this linear motor is drawn as a block). Also in this embodiment, two linear motors 42 are provided in parallel with the moving plate 41 (injection plunger 40), and the linear moving forces of the movers of the linear motors 42 are combined (added). And is transmitted to the moving plate 41 (injection plunger 40).

  Reference numeral 43 denotes a servo driver that drives the rotary servo motor 35 by feedback control, 44 and 44 denote a pair of servo drivers that respectively drive the linear motors 42 by feedback control, and 45 denotes a preset weighing. The system controller provides command values to the servo driver 43 and the paired servo drivers 44, 44 in accordance with the control conditions and the injection control conditions.

  In the configuration shown in FIG. 5, during the weighing process, the rotary servo motor 35 is driven to rotate by the command from the system controller 45 via the servo driver 43, so that it is driven by the small pulley 36 and the timing belt (not shown). The pulley 34 is rotationally driven, and the screw 33 integrated with the driven pulley 34 rotates in a predetermined direction. By the rotation of the screw 33, the resin material supplied to the rear end side of the screw 33 is kneaded and plasticized and transferred forward by the screw feed action of the screw 33. The molten resin transferred to the front is The injection plunger 40 in the second heating cylinder 38 retreats as it is fed into the second heating cylinder 38 from the tip of the first heating cylinder 32 and the molten resin accumulates in the second heating cylinder 38. . At this time, the two linear motors 42 and 42 are driven and controlled in synchronization with each other via the servo drivers 44 and 44 in response to a command from the system controller 45, whereby the back pressure applied to the injection plunger 40 is controlled and the injection plunger 40 moves backwards. Then, when a predetermined amount of molten resin is stored in the second heating cylinder 38, the rotational drive of the screw 33 by the rotary servo motor 35 is stopped.

  On the other hand, in the injection filling process, at an appropriate timing after the completion of the weighing, the two linear motors 42 and 42 are driven in synchronism via the servo drivers 44 and 44 in response to a command from the system controller 45. The integral injection plunger 40 is rapidly driven forward via the mover and the connecting plate 41, whereby the injection plunger 40 is rapidly accelerated and advanced, and the molten resin stored on the tip side of the injection plunger 40 is Injection filling is performed in a cavity of a mold (not shown). Each linear motor 42 is suddenly decelerated at an appropriate timing when the molten resin is filled in most of the cavity (the timing of the appropriate advance position of the screw), whereby the injection plunger 40 is decelerated very rapidly. The injection plunger 40 is controlled to stop when the molten resin has completely spread into the cavity.

  In the present embodiment having such a configuration and operation as well as the first embodiment, the injection filling time can be shortened as much as possible, and there is no overfilling and ultra-high speed injection filling in a very short time. By performing the above, it becomes possible to easily mold an ultra-thin molded product such as a battery case of a mobile phone or an ultra-precision small-sized molded product such as a narrow pitch connector.

  Further, since the linear movement force of the two tunnel actuator type linear motors 42 is synthesized (added together) to drive the injection plunger 40 linearly, the injection plunger is driven by the single tunnel actuator type linear motor 42. Compared with the case where 40 is driven linearly, it is possible to obtain twice the driving force. Therefore, the present invention can be applied to a large model, and for example, a machine that simultaneously molds a plurality of molded products in one molding cycle and a machine that molds a large molded product can be easily realized. Furthermore, by arranging the two linear motors 11 in parallel, the size of the machine is not increased.

<Third Embodiment>
FIG. 6 is a view showing a main configuration of a die casting machine which is a molding machine according to the third embodiment of the present invention.

  In FIG. 6, 51 is a fixed die plate, 52 is a fixed side mold mounted on the fixed die plate 51, and 53 is mounted on a movable die plate (not shown) and is moved back and forth with respect to the fixed mold 52. The movable mold 54 to be advanced, 54 is a cavity formed by the molds 52 and 53 in the clamped state, and 55 is fixed to the fixed die plate 51 at its end, and the cavity 54 and the mold runner 56 The injection sleeve communicated via the reference numeral 57, a molten metal supply portion 57 to the injection sleeve 55, 58 a cylindrical injection plunger capable of moving back and forth in the injection sleeve 55, and 59 a front and rear by an appropriate guide mechanism (not shown). The movable plate 60, which is guided and held so as to be able to advance, and to which the rear end portion of the injection plunger 58 is fixed, is fixed and held on an appropriate holding member (not shown). Four parallel-injection (screw forward / reverse control) tunnel actuator type linear motors whose child side is fixed to a moving plate 59 (for convenience of illustration, this linear motor is depicted as a block) It is. In the present embodiment, four linear motors 60 are provided in parallel with the moving plate 59 (injection plunger 58), and the linear moving forces of the movers of the linear motors 60 are combined (added). ) And is transmitted to the moving plate 59 (injection plunger 58).

  Reference numeral 61 denotes four servo drivers that drive the corresponding linear motor 60 by feedback control. Reference numeral 62 denotes a system controller that gives command values to the four servo drivers 61 according to preset injection control conditions.

  In the configuration shown in FIG. 6, before the injection, the injection plunger 58 is in the retracted position (rightward direction in the figure, right position of the molten metal supply hole 55a of the injection sleeve 55). In this state, when the molten metal pumped up from the molten metal furnace by a ladle (not shown) is supplied into the injection sleeve 55 through the molten metal supply unit 57, immediately, each servo driver 60 is instructed by a command from the system controller 65. The linear motors 60 are driven and controlled synchronously, and the injection plunger 58 is driven forward at a high speed. As a result, the molten metal 63 pushed by the injection plunger 58 is rapidly injected and filled into the cavity 54 formed by the two molds 52 and 53 in the clamped state from the injection sleeve 55 through the mold runner 56. The

  As described above, in the die casting machine of the present embodiment, the injection plunger 58 is driven forward by adding the propulsive forces of the four linear motors 60, so an extremely large acceleration can be produced, but a single large force (thrust) ) Even if it is a tunnel actuator type linear motor that is not suitable for obtaining, the injection plunger with a large diameter (cross-sectional area) can be advanced at high speed with high response by adding the propulsive forces of the four linear motors 60 Can do.

  In the above-described embodiment, an example in which two or four linear motors are provided has been described. However, any other plural linear motors can be provided for one linear moving member. Furthermore, the arrangement of the plurality of linear motors can take any arrangement form other than the parallel arrangement.

  In the above-described embodiment, a linear drive device that drives an extrusion member (linear movement member) of a melt molding material such as a screw or an injection plunger has been described as an example. Needless to say, the present invention is applicable. Furthermore, the present invention can be applied to driving various machine tools / manufacturing machines, XY tables and the like in addition to the molding machine.

It is explanatory drawing which shows the structure of the injection system mechanism of the inline screw type injection molding machine which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the outline of the structural example of the tunnel actuator type | mold linear motor used by each embodiment of this invention. FIG. 3 is an explanatory diagram showing suction force cancellation in the tunnel actuator type linear motor of FIG. 2. It is explanatory drawing which shows the relationship between the injection speed and position in the injection molding of an optical disk board | substrate. It is explanatory drawing which shows the structure of the injection type | system | group mechanism of the preparation plastic type injection molding machine which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows the principal part structure of the die-casting machine which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front holding plate 2 Rear holding plate 3 Heating cylinder 4 Nozzle 5 Screw 6 Guide bar 7 Moving body 8 Driven pulley 9 Rotary servo motor 10 Small pulley 11 Tunnel actuator type linear motor
12 Connecting bar 13, 14 Servo driver 15 System controller 21, 22 Stator (armature)
23 magnetic pole 23a upper magnetic pole tooth 23b lower magnetic pole tooth 24 magnetic pole 24a upper magnetic pole tooth 24b lower magnetic pole tooth 25 iron core 26 winding 27 mover 31 holding block 32 first heating cylinder (heating cylinder for plasticizing / melting)
33 Screw 34 Driven pulley 35 Rotary servo motor 36 Small pulley 37 Holding block 38 Second heating cylinder (heating cylinder for injection)
39 Nozzle 40 Injection plunger 41 Moving plate 42 Tunnel actuator type linear motor 43, 44 Servo driver 45 System controller 51 Fixed die plate 52 Fixed side mold 53 Movable side mold 54 Cavity 55 Injection sleeve 56 Mold runner 57 Molten metal supply section 58 Injection plunger 59 Moving plate 60 Tunnel actuator type linear motor 61 Servo driver 62 System controller 63 Molten metal

Claims (3)

A linear drive device using a linear motor as a drive source of the linear moving member,
The linear motor includes a stator around which a winding is wound, and a mover that moves linearly with respect to the stator, and the stator has a plurality of facing portions in which magnetic pole teeth face each other, The plurality of facing portions are ones in which the magnetic pole teeth of the adjacent facing portions have a staggered structure, and the linear mover having a permanent magnet is disposed between the magnetic pole teeth constituting the facing portion,
A linear driving apparatus characterized in that a plurality of linear motors are used to synthesize a linear moving force of the mover of each linear motor and transmit it to a single linear moving member. The linear drive device according to claim 1,
A linear drive device comprising the plurality of linear motors arranged in parallel. The linear drive device according to claim 1,
The linear moving member is a linear driving device characterized by a linear moving member of a molding machine.

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