JP2010253833A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a synthesized drive force of a plurality of motors as a drive source of a single injection unit. <P>SOLUTION: In order to fix a first slave pulley 21 on which a first drive transmission belt 22 is stretched, a second slave pulley 26 on which a third drive transmission belt 27 is stretched and a master pulley 20 on which second and fourth drive transmission belts 23 and 28 are stretched to base ends of rotary shafts 13a, 14a and 15a of respective injection drive motors 13, 14 and 15, the master injection drive motor 13 and the first slave injection drive motor 14 both arranged on the same plane, among the three injection drive motors 13, 14 and 15 parallel fixed to the rear side fixing frame 16 are forward/backward shifted from the second slave injection drive motor 15. By this, the pulleys 20, 21 and 26 on which the drive transmission belts are stretched can be fixed to the base ends of the respective rotary shafts 13a, 14a and 15a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injection molding machine that molds a molded body by opening and closing a mold, and particularly relates to an injection molding machine that drives an injection unit that injects a molten resin with a combined driving force of a plurality of motors.

  A general injection molding machine that has been conventionally used is roughly composed of a mold clamping unit and an injection unit. The mold clamping unit includes a fixed mold and a movable mold. The mold is opened and closed by advancing and retracting the movable mold with respect to the mold by a movable means that enables clamping such as a toggle mechanism or a direct pressure method. On the other hand, the injection unit is provided in the heating cylinder via a ball screw mechanism or the like that transmits a driving force via a pulley or a belt by a rotating force of a motor as a driving source and converts the rotating motion into a linear motion. The molten resin is injected into the mold cavity closed from the tip of the injection nozzle. In such an injection molding machine, in order to increase the driving force for injecting molten resin into the cavity, a single injection unit is operated by the driving force of a plurality of motors.

  As related to the above-described prior art, in Patent Document 1, the driving force of two servo motors, which are electric motors, is caused to advance and retract a single injection screw through two screw mechanisms provided corresponding to each. A driving apparatus for an injection molding machine is disclosed, and in Patent Document 2, the driving force of three or four motors is used to configure the injection unit via a drive transmission means including a pulley and a timing belt. A drive device for an electric injection molding machine for advancing and retracting an injection screw is disclosed.

Japanese Patent No. 3496089 JP 2001-212855 A

  However, in the conventional vertical injection molding machine disclosed in Patent Document 1, two balls are obtained by wrapping a synchronous timing belt around two synchronous timing pulleys fixed to the tip ends of the ball screw shafts. The rotation of the screw shaft is synchronized, and the driving force of the two servo motors is used as the driving force for advancing and retracting the injection screw. However, depending on the shape and size of the molded product, a larger drive It may be necessary to move the injection screw back and forth with force. In view of this, for example, Patent Document 2 proposes an injection molding machine that can use the driving force of three or more servo motors as a driving source for advancing and retracting the injection screw. Has been. However, as the number of servo motors increases, the number of timing belts and pulleys for transmitting the driving force increases accordingly, which complicates the layout, and parts such as timing belts and pulleys come into contact with each other. For example, as shown in FIG. 1 and FIG. 5 of Patent Document 2, layout restrictions such as arranging the servo motors apart from each other vertically occur.

  The present invention has been made in view of the above problems, and in order to increase the driving force of the injection unit, a plurality of motors are combined even if the driving source has a plurality of motors and has a complicated structure. An object of the present invention is to provide an injection molding machine that can reliably use a driving force as a driving source of a single injection unit.

An injection molding machine according to claim 1 is:
An injection nozzle that injects molten resin into the cavity of the mold by being advanced,
First and second ball screw mechanisms for converting a rotary motion into a linear motion to advance the screw when injecting molten resin from the injection nozzle;
A first drive transmission pulley for operating the first ball screw mechanism;
A second drive transmission pulley for operating the second ball screw mechanism;
A master injection drive motor that rotationally drives the first and second drive transmission pulleys as a main drive source;
A master pulley fixed to the rotating shaft of the master injection driving motor;
A first slave injection drive motor as a secondary drive source that supplements the driving force of the master injection drive motor;
A first slave pulley fixed to the rotating shaft of the first slave injection driving motor; a second slave injection driving motor as a secondary drive source that supplements the driving force of the master injection driving motor;
A second slave pulley fixed to the rotary shaft portion of the second slave injection driving motor,
The master injection driving is performed by winding a first drive transmission belt wound around the first slave pulley and a second drive transmission belt wrapped around the master pulley around the first drive transmission pulley. A combined driving force of the motor for driving and the first slave injection driving motor is transmitted to the first drive transmission pulley,
The master injection driving is performed by winding a third drive transmission belt wound around the second slave pulley and a fourth drive transmission belt wrapped around the master pulley around the second drive transmission pulley. An injection molding machine configured to transmit a combined driving force of the motor for motor and the second slave injection driving motor to the second drive transmission pulley,
A first slave pulley that is wound around the first drive transmission belt; a second slave pulley that is wound around the third drive transmission belt; and a master that is wound around the second and fourth drive transmission belts The master injection drive arranged on the same plane among the three motors fixed in parallel to the fixed frame so that the pulley can be fixed to the base end portion of the rotation shaft portion of each motor that rotationally drives these pulleys The arrangement relationship between the motor for driving and the first slave injection driving motor and the second slave injection driving motor is shifted in the front-rear direction.

The injection molding machine according to claim 2 is the injection molding machine according to claim 1,
The first drive transmission belt is wound around the proximal end side of the first drive transmission pulley, while the second drive is applied to the distal end side of the first drive transmission pulley adjacent to the first drive transmission belt. Hung around the transmission belt,
The second drive transmission belt is hung around the front end side of the master pulley, while the fourth drive transmission belt is hung around the base end side of the master pulley,
The fourth drive transmission belt is wound around the proximal end side of the second drive transmission pulley, while the third drive is applied to the distal end side of the second drive transmission pulley adjacent to the fourth drive transmission belt. When hanging the transmission belt,
The master injection drive motor and the first slave injection drive corresponding to the position where the third drive transmission belt is wound around the distal end side of the second drive transmission pulley adjacent to the fourth drive transmission belt. The second slave injection driving motor is fixed to the fixed frame in a state in which the second slave injection driving motor is moved backward from the injection unit.

An injection molding machine according to claim 3 is:
An injection nozzle for injecting molten resin into the mold cavity;
First and second ball screw mechanisms for converting a rotational motion into a linear motion to advance and retract the screw;
A first drive transmission pulley for operating the first ball screw mechanism;
A second drive transmission pulley for operating the second ball screw mechanism;
A master injection drive motor that rotationally drives the first and second drive transmission pulleys as a main drive source;
A master pulley fixed to the rotating shaft of the master injection driving motor;
A first slave injection drive motor as a secondary drive source that supplements the driving force of the master injection drive motor;
A first slave pulley fixed to the rotating shaft of the first slave injection driving motor; a second slave injection driving motor as a secondary drive source that supplements the driving force of the master injection driving motor;
A second slave pulley fixed to the rotary shaft portion of the second slave injection driving motor,
The master injection driving motor is configured such that a first drive transmission belt hung on the first slave pulley and a second drive transmission belt hung on the master pulley are hung on the first drive transmission pulley. And configured to transmit the combined driving force of the first slave injection driving motor to the first drive transmission pulley,
The master injection driving motor is configured such that a third drive transmission belt hung on the second slave pulley and a fourth drive transmission belt hung on the master pulley are hung on the second drive transmission pulley. And the combined driving force of the second slave injection driving motor is transmitted to the second drive transmission pulley.

  According to the invention of the injection molding machine, the arrangement of the master injection driving motor, the first slave injection driving motor, and the second slave injection driving motor arranged on the same plane is changed in the front-rear direction (more specifically, The second slave injection drive motor is shifted and fixed to the master injection drive motor and the first slave injection drive motor arranged on the same plane to the rear side of the injection unit, thereby fixing the frame in parallel. Fixed to the base end of each rotation shaft of the master injection driving motor, the first slave injection driving motor, and the second slave injection driving motor (master pulley, first slave It is possible to hang a drive transmission belt for transmitting the driving force of the motor to the pulley and the second slave pulley. Therefore, it is possible to eliminate the necessity of providing the pulley separately from the motor body without providing the pulley on the base end side of the rotating shaft portion of the motor due to layout restrictions. For example, if a pulley is fixed to the front end side of the rotary shaft portion that is separated from the motor body, the pulley may cause rotational shaking with the rotation of the rotary shaft portion and may become unstable to transmit the driving force. However, in the present invention, since the pulley around which the drive transmission belt is wound can be disposed at the base end portion of the rotating shaft portion, the driving force of the motor is stably transmitted to the drive transmission belt via the pulley. be able to.

  Furthermore, each of the annular first to fourth drive transmission belts is not provided around three or more pulleys so that the length thereof is as short as possible. For example, if the drive transmission belt is hung around three or more pulleys, the length of the belt must be increased, and the initial elongation of the belt accompanying use increases. Since the looseness of the tension increases, a means such as a tension roller for applying tension to the belt is necessary. In the present invention, each of the drive transmission belts is wound around two pulley units as described above. Therefore, the extension dimension of the drive transmission belt can be suppressed as much as possible, and there is no need to provide tension means such as a tension roller. Therefore, an injection molding machine that saves space and costs is reduced. It is possible to obtain.

It is a side view which shows the whole injection molding machine of an example of this invention. It is a top view which shows the injection unit comprised in an injection molding machine same as the above. It is a rear view which shows an injection unit same as the above. It is a perspective view which shows the state which looked at the injection unit from the back side same as the above.

  Hereinafter, an embodiment as a mode for carrying out the present invention will be described with reference to FIGS. Needless to say, the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  The injection molding machine 1 shown in FIG. 1 is roughly divided into a mold clamping unit 2 and an injection unit 3. The mold clamping unit 2 includes a movable die 5 fixed to a movable die plate 4, a fixed die plate. A fixed mold 7 fixed to 6 and a toggle link mechanism 8 for opening and closing the mold by moving the movable mold 5 forward and backward with respect to the fixed mold 7 are configured.

  As shown in FIG. 2, the injection unit 3 includes two metering drive motors 9 as drive sources and three injection drive motors described later. The metering drive motor 9 is rotationally driven. Along with this, the screw provided in the heating cylinder 10 is rotated, and the molten resin supplied into the heating cylinder is sent to the tip end side of the screw to measure it.

  The master injection driving motor 13, the first slave injection driving motor 14, and the second slave injection driving motor 15 as the injection driving motor described above are arranged in parallel to the rear fixed frame 16 by fixing means such as screws. The master pulley 20 is provided at the base end portion of the rotation shaft portion 13a of the master injection driving motor 13, and the first end portion of the rotation shaft portion 14a of the first slave injection drive motor 14 is provided at the first end portion. The second slave pulley 26 is fixed to the base end portion of the rotary shaft portion 15 a of the second slave injection driving motor 15.

  As shown in FIGS. 3, 4, etc., the first drive transmission belt 22 that is wound around the first slave pulley 21 and the second drive transmission belt 23 that is wound around the front end side of the master pulley 20 are The first drive transmission pulley 25 is rotated by the combined drive force of the master injection drive motor 13 and the first slave injection drive motor 14 by being wound around the first drive transmission pulley 25. In addition, the third drive transmission belt 27 that is wound around the second slave pulley 26 and the fourth drive transmission belt 28 that is wound around the base end side of the master pulley 20 are: The second drive transmission pulley 29 is rotated by the combined drive force of the master injection drive motor 13 and the second slave injection drive motor 15 by being wound around the second drive transmission pulley 29. It has become.

  The first and second drive transmission pulleys 25 and 29 arranged side by side are rotatably supported by the rear fixed frame 16 below the injection drive motors 13, 14, and 15. The first and second ball screw portions 31a and 31b are fixed to one end of the first and second ball screw portions 31a and 31b that are configured in the second ball screw mechanisms 30a and 30b. The first and second drive transmission pulleys 25 and 29 are rotated in the same direction.

  The first and second ball screw mechanisms 30a and 30b are respectively connected to the first and second ball screw portions 31a and 31b and the first and second ball screw portions 31a and 31b. Nut portions 32a and 32b are configured. The first and second nut portions 32a and 32b are attached to four columnar tie bars 36 installed on the front side fixed frame 35 and the rear side fixed frame 16 so as to be able to advance and retreat (left and right direction shown in FIG. 2). Provided integrally with the support plate 37, the support plate 37 is advanced and retracted via the first and second nut portions 32a and 32b as the first and second ball screw portions 31a and 31b are rotated. When the support plate 37 is moved forward, the screw in the heating cylinder 10 is moved along with it, and the measured molten resin is injected from the tip of the injection nozzle 12 into the mold cavity.

  As shown in FIG. 2, among the master injection driving motor 13, the first slave injection driving motor 14, and the second slave injection driving motor 15 provided in parallel, the second slave injection driving motor 15 is provided. The motor 15 is rear-side fixed with a slight shift (specifically 35 mm) to the rear side of the injection unit 3 with respect to the master injection driving motor 13 and the first slave injection driving motor 14 arranged on the same plane. It is fixed to the frame 16. In other words, the master injection driving motor 13 and the first slave injection driving motor 14 arranged on the same plane with respect to the second slave injection driving motor 15 are slightly shifted to the front side of the injection unit 3 and the rear side. The second slave injection drive motor 15 located on the base end surface a of the rear fixed frame 16 and the master injection drive motor 13 provided in parallel on the same surface are fixed to the fixed frame 16. And the first slave injection driving motor 14 are fixed in a state where the positional relationship is shifted back and forth, so that a master is provided on the step b of the rear fixed frame 16 formed in front of the base end surface a. By providing the injection drive motor 13 and the first slave injection drive motor 14, two ball screws with the three injection drive motors 13, 14, 15 as drive sources. Even if it has a complicated drive transmission structure that drives a single injection unit 2 via the structures 30a and 30b, the base ends of the rotary shaft portions 13a, 14a, and 15a of the injection drive motors 13, 14, and 15a It is possible to fix the pulleys 20, 21, and 26 around which the drive transmission belt is wound around the portion.

  As described above, according to the injection molding machine 1 according to the present embodiment, the combined driving force of the three injection driving motors 13, 14, and 15 is supplied to the screw of the single injection unit 3 via the two ball screw mechanisms and the like. The injection nozzle 12 that injects the molten resin into the mold cavity by being advanced, and the screw that converts the rotational motion to the linear motion when the molten resin is injected from the injection nozzle 12. First and second ball screw mechanisms 30a, 30b for advancing the first and second nuts 32a of the first ball screw mechanism 30a are operated by rotating the first ball screw portion 31a. A pulley 25, a second drive transmission pulley 29 for operating the second nut portion 32b of the second ball screw mechanism 30b by rotating the second ball screw portion 31b, A master injection drive motor 13 that rotationally drives the first and second drive transmission pulleys 25 and 29 as a drive source, a master pulley 20 fixed to the rotary shaft portion 13a of the master injection drive motor 13, and a master injection drive A first slave injection driving motor 14 as a secondary driving source that supplements the driving force of the motor 13 for driving, and a first slave pulley 21 fixed to the rotating shaft portion 14a of the first slave injection driving motor 14, A second slave injection driving motor 15 as a secondary driving source that supplements the driving force of the master injection driving motor 13, and a second slave pulley 26 fixed to the rotary shaft portion of the second slave injection driving motor 15. And a first drive transmission belt 22 that is wound around the first slave pulley 21 and a second drive transmission bell that is wound around the master pulley 20. 23 is wound around the first drive transmission pulley 25 to transmit the combined drive force of the master injection drive motor 13 and the first slave injection drive motor 14 to the first drive transmission pulley 25. Then, the third drive transmission belt 27 wound around the second slave pulley 26 and the fourth drive transmission belt 28 wrapped around the master pulley 20 are wound around the second drive transmission pulley 29. An injection molding machine 1 configured to transmit a combined driving force of a master injection driving motor 13 and a second slave injection driving motor 15 to a second drive transmission pulley 29, the first drive transmission belt The first slave pulley 21 that is wound around 22, the second slave pulley 26 that is wound around the third drive transmission belt 27, and the second and fourth drive transmission belts 23, 28 are wound around The master pulley 20 is fixed in parallel to the rear fixed frame 16 so that the master pulley 20 can be fixed to the base end portions of the rotating shaft portions 14a, 15a, 13a of the motors 14, 15, 13 that rotationally drive them. Among the two motors, the arrangement relationship between the master injection driving motor 13 and the first slave injection driving motor 14 and the second slave injection driving motor 15 which are arranged on the same surface as shown in FIG. More specifically, the first drive transmission belt 22 is wound around the base end side of the first drive transmission pulley 25 while the first drive transmission belt 22 is connected to the first drive transmission belt 22. The second drive transmission belt 23 is hung around the front end side of the adjacent first drive transmission pulley 25, and the second drive transmission belt 23 is hung around the front end side of the master pulley 20, while the second drive transmission belt 23 is put on the base end side. Four The fourth drive transmission belt 29 is wound around the fourth drive transmission belt 28 while the fourth drive transmission belt 28 is wound around the proximal end side of the second drive transmission pulley 29. When the third drive transmission belt 27 is hung around the front end side of the second drive transmission belt 28, the third drive transmission belt 27 is hung around the front end side of the second drive transmission pulley 29 adjacent to the fourth drive transmission belt 28. Correspondingly, in a state where the second slave injection driving motor 15 is moved backward to the back of the injection unit 3 (right side shown in FIG. 2) rather than the master injection driving motor 13 and the first slave injection driving motor 14. The second slave injection driving motor 15 is fixed to the rear fixed frame 16.

  With the above configuration, the arrangement of the master injection driving motor 13 and the first slave injection driving motor 14 and the second slave injection driving motor 15 arranged on the same plane is shifted and fixed in the front-rear direction. The rotation shafts 13a, 14a, 15a of the master injection driving motor 13, the first slave injection driving motor 14, and the second slave injection driving motor 15 fixed in parallel to the rear frame 16 Drive transmission belts 22, 23, 27 for transmitting the driving force of the injection driving motor to the master pulley 20, the first slave pulley 21, and the second slave pulley 26 fixed to the base end. 28 can be multiplied. Therefore, the pulleys 20, 21, and 26 cannot be provided at the base end portions of the rotation shaft portions 13a, 14a, and 15a of the motors 13, 14, and 15 due to layout restrictions, and the pulleys are separated from the motor body. For example, if a pulley is fixed to the front end side of the rotating shaft portion that is separated from the motor body, the drive transmission belt is hung along with the rotation of the rotating shaft portion. The rotated pulley may cause rotational vibration and the like, and may become unstable to transmit the driving force. However, in the present invention, the pulleys 20, 21, and 26 around which the driving transmission belt is wound are connected to the base end of the rotating shaft portion. Therefore, the driving force of the motor can be stably transmitted to the drive transmission belt via the pulley.

  Furthermore, as shown in FIG. 4, each of the annular first to fourth drive transmission belts 22, 23, 27, 28 has three or more in order to make each length as short as possible. Instead of hanging around several pulleys, they are hung around by two pulley units. For example, if a drive transmission belt is hung around three or more pulleys, the length of the belt must be increased. Since the initial elongation dimension of the belt with use becomes longer and the looseness of the tension becomes larger, a means such as a tension roller for applying tension to the belt is necessary. Each of the belts 22, 23, 27, and 28 is wound around two pulley units as described above, so that the extension dimension of the drive transmission belt can be suppressed as much as possible. Since the need to tension means without providing, it is possible to obtain an injection molding machine 1 which attained less space and less cost. In general, when the drive transmission belt is hung around three or more pulleys, the contact area between the belt and the pulley is inevitably reduced, so that the contact area between the belt and the pulley according to the driving force is sufficient. Therefore, it is necessary to widen the belt width, and it is necessary to adopt a wide pulley correspondingly, resulting in an increase in the size of the apparatus. However, in the injection molding machine 1 according to the present invention, since each of the drive transmission belts is wound around two pulley units, the width of the pulley can be kept relatively small. It is possible to obtain an injection molding machine 1 in which the width of the rotated pulley is reduced and the size is reduced.

  Although one embodiment of the present embodiment has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. In the example of the present invention, the structure in which the single injection unit 3 is operated via the two ball screw mechanisms or the like by the driving force of the three motors that are the driving sources has been described. Even if it exists, it is applicable.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 12 Injection nozzle 13 Master injection drive motor 13a Rotation shaft part of master injection drive motor 14 First slave injection drive motor 14a Rotation shaft part of first slave injection drive motor 15 Second slave Injection drive motor 15a Rotating shaft portion of second slave injection drive motor 16 Rear fixed frame (fixed frame)
20 master pulley 21 first slave pulley and 22 first drive transmission belt 23 second drive transmission belt 25 first drive transmission pulley 26 second slave pulley 27 third drive transmission belt 28 fourth drive transmission Belt 29 Second drive transmission pulley 30a First ball screw mechanism 30b Second ball screw mechanism

Claims (3)

An injection nozzle that injects molten resin into the cavity of the mold by being advanced,
First and second ball screw mechanisms for converting a rotary motion into a linear motion to advance the screw when injecting molten resin from the injection nozzle;
A first drive transmission pulley for operating the first ball screw mechanism;
A second drive transmission pulley for operating the second ball screw mechanism;
A master injection drive motor that rotationally drives the first and second drive transmission pulleys as a main drive source;
A master pulley fixed to the rotating shaft of the master injection driving motor;
A first slave injection drive motor as a secondary drive source that supplements the driving force of the master injection drive motor;
A first slave pulley fixed to the rotating shaft of the first slave injection driving motor; a second slave injection driving motor as a secondary drive source that supplements the driving force of the master injection driving motor;
A second slave pulley fixed to the rotary shaft portion of the second slave injection driving motor,
The master injection driving is performed by winding a first drive transmission belt wound around the first slave pulley and a second drive transmission belt wrapped around the master pulley around the first drive transmission pulley. A combined driving force of the motor for driving and the first slave injection driving motor is transmitted to the first drive transmission pulley,
The master injection driving is performed by winding a third drive transmission belt wound around the second slave pulley and a fourth drive transmission belt wrapped around the master pulley around the second drive transmission pulley. An injection molding machine configured to transmit a combined driving force of the motor for motor and the second slave injection driving motor to the second drive transmission pulley,
A first slave pulley that is wound around the first drive transmission belt; a second slave pulley that is wound around the third drive transmission belt; and a master that is wound around the second and fourth drive transmission belts The master injection drive arranged on the same surface among the three motors fixed in parallel to the fixed frame so that the pulley can be fixed to the base end portion of the rotating shaft portion of each motor that rotationally drives these pulleys An injection molding machine characterized in that the positional relationship between the motor for motor and the first slave injection driving motor and the second slave injection driving motor is shifted in the front-rear direction. The first drive transmission belt is wound around the proximal end side of the first drive transmission pulley, while the second drive is applied to the distal end side of the first drive transmission pulley adjacent to the first drive transmission belt. Hung around the transmission belt,
The second drive transmission belt is hung around the front end side of the master pulley, while the fourth drive transmission belt is hung around the base end side of the master pulley,
The fourth drive transmission belt is wound around the proximal end side of the second drive transmission pulley, while the third drive is applied to the distal end side of the second drive transmission pulley adjacent to the fourth drive transmission belt. When hanging the transmission belt,
The master injection drive motor and the first slave injection drive corresponding to the position where the third drive transmission belt is wound around the distal end side of the second drive transmission pulley adjacent to the fourth drive transmission belt. 2. The injection molding machine according to claim 1, wherein the second slave injection driving motor is fixed to the fixed frame in a state in which the second slave injection driving motor is moved backward from the injection unit. An injection nozzle for injecting molten resin into the mold cavity;
First and second ball screw mechanisms for converting a rotational motion into a linear motion to advance and retract the screw;
A first drive transmission pulley for operating the first ball screw mechanism;
A second drive transmission pulley for operating the second ball screw mechanism;
A master injection drive motor that rotationally drives the first and second drive transmission pulleys as a main drive source;
A master pulley fixed to the rotating shaft of the master injection driving motor;
A first slave injection drive motor as a secondary drive source that supplements the driving force of the master injection drive motor;
A first slave pulley fixed to the rotating shaft of the first slave injection driving motor; a second slave injection driving motor as a secondary drive source that supplements the driving force of the master injection driving motor;
A second slave pulley fixed to the rotary shaft portion of the second slave injection driving motor,
The master injection driving motor is configured such that a first drive transmission belt hung on the first slave pulley and a second drive transmission belt hung on the master pulley are hung on the first drive transmission pulley. And configured to transmit the combined driving force of the first slave injection driving motor to the first drive transmission pulley,
The master injection driving motor is configured such that a third drive transmission belt hung on the second slave pulley and a fourth drive transmission belt hung on the master pulley are hung on the second drive transmission pulley. And an injection molding machine characterized in that the combined driving force of the second slave injection driving motor is transmitted to the second drive transmission pulley.

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