JP2016002745A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine that allows easy adjustment of a phase difference between rotational directions of respective belts rotating in synchronization with each other.SOLUTION: An injection molding machine comprises: a first phase difference adjustment pulley 12 wound by a first belt 20 wound on a first drive pulley 7 and first drive transmission pulley 10; and a second phase difference adjustment pulley 13 wound by a second belt 21 wound on a second drive pulley 9 and second drive transmission pulley 11. The first phase difference adjustment pulley 12 and the second phase difference adjustment pulley 13 are provided concentrically with each other so as to be independently rotatable. Fastening means is provided which locks the first phase difference adjustment pulley 12 and the second phase difference adjustment pulley 13 integrally with each other. Consequently, the first phase difference adjustment pulley 12 and the second phase difference adjustment pulley 13 are unlocked to allow easy adjustment of a phase difference between rotational directions of a first belt 20 and a second belt 21.

Description

  The present invention relates to an injection molding machine that molds a molded body by injecting molten resin into a mold cavity, and in particular, a screw that injects molten resin by forward movement is synthesized by a plurality of drive sources. The present invention relates to an injection molding machine driven by a driving force.

  A general injection molding machine that has been used conventionally is roughly composed of a mold clamping unit and an injection unit. The mold clamping unit includes a fixed mold and a movable mold, and a toggle mechanism. Alternatively, the movable mold is opened and closed by moving the movable mold with respect to the fixed mold by a movable means such as a direct pressure method. On the other hand, in the injection unit, the rotational force of the motor as a driving source is transmitted to the ball screw mechanism via a pulley, a belt, etc., and is provided in the heating cylinder by the ball screw mechanism that converts the rotational motion into a linear motion. The screw is operated, and 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 screw 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 electric motors is moved forward and backward through an electric timing belt and a screw mechanism provided in correspondence with each other. A drive device for an injection molding machine is disclosed. Patent Document 2 discloses a drive device for an injection molding machine that causes a single injection screw to advance and retreat through a belt body and a rotating member provided with driving forces of two drive motors, respectively. Has been.

Japanese Patent No. 3496089 Japanese Patent No. 3517747

  However, in the conventional injection molding machine disclosed in Patent Document 1, in order to operate the two screw mechanisms in synchronization with each other, a synchronous timing pulley provided on each tip side of the ball screw shaft is used. The two ball screw shafts are synchronized by winding one synchronization timing belt. Therefore, it is necessary to provide a synchronization mechanism that is exclusively intended for synchronization, thereby increasing the number of parts and increasing the cost, or increasing the number of parts and causing the cause of failure. There is.

  In addition, in the conventional injection molding machine disclosed in Patent Document 2, each belt wound around the respective drive pulleys of the two drive motors without providing a synchronization mechanism exclusively for synchronization. The body is wound around each of the two driven pulleys to synchronize the rotation of the two rotating members. However, as in the device of Patent Document 2, in the case where synchronization is performed by using a belt for transmitting driving, one driving pulley 5, one driven pulley 10, and the other driven pulley are used. The phase difference is adjusted so that there is no phase difference in the rotational direction between the belt body 13 wound around 10 and the belt 14 wound around the other driving pulley 6, the other driven pulley 11, and the one driven pulley 10. Need to do.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection molding machine in which the phase difference in the rotation direction of each belt rotated in synchronization with each other can be easily adjusted.

The invention relating to the injection molding machine of claim 1
An injection nozzle that injects molten resin into the mold cavity by advancing the screw in the heating cylinder;
First and second ball screw mechanisms for converting the rotational motion into a linear motion when the molten resin is injected from the injection nozzle to advance 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 first injection drive motor that rotationally drives the first drive transmission pulley;
A second injection drive motor for rotationally driving the second drive transmission pulley;
A first drive pulley fixed to a rotary shaft portion of the first injection drive motor;
An injection molding machine comprising: a second drive pulley fixed to a rotary shaft portion of the second injection drive motor;
A first phase difference adjusting pulley that is wound around a first belt that is wound around the first drive pulley and the first drive transmission pulley;
A second phase difference adjusting pulley that is wound around a second belt that is wound around the second drive pulley and the second drive transmission pulley,
The first phase difference adjusting pulley and the second phase difference adjusting pulley can be separately rotated and provided concentrically,
A fastening means for locking the first phase difference adjusting pulley and the second phase difference adjusting pulley so as to be integrated with each other is provided.

The invention relating to the injection molding machine of claim 2
An injection nozzle that injects molten resin into the mold cavity by advancing the screw in the heating cylinder;
First and second ball screw mechanisms for converting the rotational motion into a linear motion when the molten resin is injected from the injection nozzle to advance 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 first injection drive motor that rotationally drives the first drive transmission pulley;
A second injection drive motor for rotationally driving the second drive transmission pulley;
A first drive pulley fixed to a rotary shaft portion of the first injection drive motor;
An injection molding machine comprising: a second drive pulley fixed to a rotary shaft portion of the second injection drive motor;
A first drive transmission belt wound around the first drive pulley and the first drive transmission pulley;
A second drive transmission belt wound around the second drive pulley and the second drive transmission pulley;
A first phase difference adjusting pulley that is wound around a third drive transmission belt that is wound around the first drive transmission pulley;
A second phase difference adjusting pulley that is wound around a fourth drive transmission belt that is wound around the second drive transmission pulley,
The first phase difference adjusting pulley and the second phase difference adjusting pulley can be separately rotated and provided concentrically,
A fastening means for locking the first phase difference adjusting pulley and the second phase difference adjusting pulley so as to be integrated with each other is provided.

  According to the invention relating to the injection molding machine of the first aspect, the first drive pulley and the first drive transmission pulley are released by unlocking the first phase difference adjustment pulley and the second phase difference adjustment pulley. And a first belt wound around the first phase difference adjusting pulley, a second belt wound around the second driving pulley, the second drive transmission pulley, and the second phase difference adjusting pulley. The phase difference in the rotation direction can be easily adjusted. Specifically, even if there is a phase difference in the rotational direction of the second belt with respect to the first belt, the first phase difference adjusting pulley and the second phase difference adjusting pulley by the fastening means. And the second phase difference adjusting pulley around which the second belt is wound in an appropriate direction with reference to the position of the first phase difference adjusting pulley around which the first belt is wound. And adjusting the phase difference between the first belt and the second belt, and then locking and integrating the first phase difference adjusting pulley and the second phase difference adjusting pulley by the fastening means. By doing so, the phase difference in the rotation direction between the first belt and the second belt can be easily eliminated.

  According to the invention relating to the injection molding machine of the second aspect, by releasing the lock between the first phase difference adjusting pulley and the second phase difference adjusting pulley, the first drive transmission pulley and the first phase difference adjusting pulley are released. The rotational direction position of the third drive transmission belt wound around the phase difference adjusting pulley and the fourth drive transmission belt wound around the second drive transmission pulley and the second phase difference adjustment pulley. The phase difference can be easily adjusted. Specifically, even if there is a phase difference in the rotational direction of the fourth drive transmission belt with respect to the third drive transmission belt, the first phase difference adjusting pulley and the second The lock with the phase difference adjusting pulley is released, and the second drive transmission belt is wound around the second phase with respect to the position of the first phase difference adjustment pulley around which the third drive transmission belt is wound. The phase difference adjustment pulley is rotated in an appropriate direction to adjust the phase difference between the third drive transmission belt and the fourth drive transmission belt, and then the first phase difference adjustment pulley and the second phase difference are adjusted. By locking and adjusting the adjustment pulley with the fastening means, the phase difference in the rotational direction between the third drive transmission belt and the fourth drive transmission belt can be easily eliminated.

It is a perspective view which shows the injection unit comprised in the injection molding machine of Example 1. FIG. It is a schematic block diagram which shows the state which looked at the injection unit comprised by the injection molding machine of Example 1 from upper direction. It is a perspective view which shows the injection unit comprised in the injection molding machine of Example 2. FIG.

  Hereinafter, an embodiment as a mode for carrying out the present invention will be described below 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.

  An injection molding machine according to an example of the present invention is roughly divided into an injection unit 1 and a mold clamping unit (not shown). The mold clamping unit is not illustrated because it is not the gist of the present invention, but a movable die plate with a movable die attached thereto, a fixed die plate with a fixed die attached thereto, and a toggle for moving the movable die plate back and forth. A link mechanism is provided.

  As shown in FIGS. 1 and 2, the injection unit 1 includes two injection drive motors 2 and 3 as drive sources, and by the combined driving force of the two injection drive motors 2 and 3, By advancing a single screw provided in the heating cylinder together with the movable plate 5 to be described later, the molten resin is injected into the mold cavity from the injection nozzle attached to the tip of the heating cylinder.

  The two injection drive motors 2, 3 described above are composed of first and second injection drive motors 2, 3, and these first and second injection drive motors 2, 3 are arranged in parallel with the movable plate 5. It is fixed to. A first drive pulley 7 is fixed to the rotary shaft portion 6 of the first injection drive motor 2, and a second drive pulley 9 is fixed to the rotary shaft portion 8 of the second injection drive motor 3. Has been.

  A first drive transmission pulley 10 is provided below the first drive pulley 7. A second drive transmission pulley 11 is provided below the second drive pulley 9. Between the first drive transmission pulley 10 and the second drive transmission pulley 11, two phase difference adjustment pulleys 12 and 13 arranged concentrically are provided. The two phase difference adjusting pulleys 12 and 13 include a first phase difference adjusting pulley 12 and a second phase difference adjusting pulley 13, and the first phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13. 13 can be rotated separately, and is supported so as to be rotatable with respect to the movable plate 5. In addition, since the first phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13 are separate bodies, they can be rotated separately. The phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13 can be integrated by locking.

  A first belt 20 is wound around the first drive pulley 7, the first drive transmission pulley 10, and the first phase difference adjustment pulley 12. A second belt 21 is wound around the second drive pulley 8, the second drive transmission pulley 11, and the second phase difference adjustment pulley 13. Then, the first belt 20 is wound around the first phase difference adjusting pulley 12 and the second belt 21 is wound around the second phase difference adjusting pulley 13. When the adjustment pulley 12 and the second phase difference adjustment pulley 13 are unlocked, adjustment can be made so that the phase difference in the rotational direction between the first belt 20 and the second belt 21 is eliminated. .

  Further, the movable plate 5 includes a first ball screw mechanism 24 including a first ball screw portion 22 and a first nut portion 23 screwed into the first ball screw portion 22, and a second ball screw mechanism 24. A second ball screw mechanism 27 including a ball screw portion 25 and a second nut portion 26 screwed into the second ball screw portion 25 is provided. The first drive transmission pulley 10 is fixed to one end of the first ball screw portion 22. The second drive transmission pulley 11 is fixed to one end of the second ball screw portion 25. As a result, the first ball screw part 22 is rotated together with the first drive transmission pulley 10, and the second ball screw part 25 is rotated together with the second drive transmission pulley 11.

  The first and second nut portions 23 and 26 are provided integrally with the fixed plate 4. When the first and second ball screw portions 22 and 25 are rotated, the first and second ball screw portions 22 and 25 are fixed to the fixing plate 4. The movable plate 5 is also moved forward by the screw action, and the screw in the heating cylinder is then moved forward so that the measured molten resin is attached to the tip of the heating cylinder. Is injected into the mold cavity.

  According to the injection molding machine according to the first embodiment, the combined driving force of the two injection drive motors 2 and 3 is used to mold molten resin through a drive transmission system such as a plurality of belts and a ball screw mechanism. Used as a screw drive source when injecting into the cavity of the mold, an injection nozzle for injecting molten resin into the mold cavity by the advance of the screw in the heating cylinder, and injection of the molten resin from the injection nozzle The first and second ball screw mechanisms 24 and 27 for moving the screw forward by converting the rotational motion into a linear motion, the first drive transmission pulley 10 for operating the first ball screw mechanism 24, and the second The second drive transmission pulley 11 that operates the ball screw mechanism 27, the first injection drive motor 2 that rotationally drives the first drive transmission pulley 10, and the second drive transmission pulley 11 are rotationally driven. The second injection drive motor 3, the first drive pulley 7 fixed to the rotary shaft portion 6 of the first injection drive motor 2, and the rotary shaft portion 8 of the second injection drive motor 3 are fixed. The first drive pulley 9 includes a first belt 20 wound around a first drive pulley 7 and a first drive transmission pulley 10. And a second phase difference adjusting pulley 13 that is wound around a second belt 21 that is wound around the second drive pulley 9 and the second drive transmission pulley 11. The first phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13 can be separately rotated and provided concentrically. Fastening means for locking the first phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13 to be integrated is provided.

  With the above configuration, the first drive pulley 7, the first drive transmission pulley 10, and the first phase difference are released by unlocking the first phase difference adjustment pulley 12 and the second phase difference adjustment pulley 13. A first belt 20 wound around the adjustment pulley 12, a second belt 21 wound around the second drive pulley 9, the second drive transmission pulley 11, and the second phase difference adjustment pulley 13. The phase difference in the rotation direction can be easily adjusted. Specifically, even if there is a phase difference in the rotational direction of the second belt 21 with respect to the first belt 20, the first phase difference adjusting pulley 12 and the second position by the fastening means. The second position where the second belt 21 is wound is determined based on the position of the first phase difference adjusting pulley 12 where the first belt 20 is wound and the lock with the phase difference adjusting pulley 13 is released. The phase difference adjusting pulley 13 is rotated in an appropriate direction to adjust the phase difference between the first belt 20 and the second belt 21, and then the first phase difference adjusting pulley 12 and the second phase difference are adjusted. By locking and integrating the pulley 13 with the fastening means, the phase difference in the rotational direction between the first belt 20 and the second belt 21 can be easily eliminated.

  Since Example 2 has the same structure except that the number of belts and how to hang are different from Example 1, the same parts are denoted by the same reference numerals, and detailed description thereof will be omitted. The different points will be described below.

  In the first embodiment, the first belt 20 is wound around the first drive pulley 7, the first drive transmission pulley 10, and the first phase difference adjustment pulley 12, and the second belt 21 is connected to the second belt 21. As shown in FIG. 3, in the second embodiment, the first drive transmission belt is wound around the drive pulley 9, the second drive transmission pulley 11, and the second phase difference adjustment pulley 13. 30 is wound around the first drive pulley 7 and the first drive transmission pulley 10, and the third drive transmission belt 31 is connected to the first drive transmission pulley 10 and the first phase difference adjusting pulley 12. It is hung around. Further, the second drive transmission belt 32 is wound around the second drive transmission pulley 9 and the second drive transmission pulley 11, and the fourth drive transmission belt 33 is connected to the second drive transmission pulley 11. It is wound around the second phase difference adjusting pulley 13.

  With the above configuration, the first phase difference adjusting pulley 12 and the second phase difference adjusting pulley 13 are unlocked, so that the first drive transmission pulley 10 and the first phase difference adjusting pulley 12 are wound around. The rotational phase difference between the third drive transmission belt 31 and the fourth drive transmission belt 33 wound around the second drive transmission pulley 11 and the second phase difference adjustment pulley 13 can be easily obtained. Can be adjusted. Specifically, even if there is a phase difference in the rotational direction of the fourth drive transmission belt 33 with respect to the third drive transmission belt 31, the first phase difference adjusting pulley 12 by the fastening means and The fourth drive transmission belt 33 is unlocked with respect to the second phase difference adjustment pulley 13 and the position of the first phase difference adjustment pulley 12 around which the third drive transmission belt 31 is wound is used as a reference. The second phase difference adjusting pulley 13 that has been wound is rotated in an appropriate direction to adjust the phase difference between the third drive transmission belt 31 and the fourth drive transmission belt 33, and then the first phase difference adjustment pulley 13 is rotated. The phase difference in the rotational direction between the third drive transmission belt 31 and the fourth drive transmission belt 33 is obtained by locking and integrating the phase difference adjustment pulley 12 and the second phase difference adjustment pulley 13 with fastening means. Can be easily eliminated.

  As mentioned above, although the present Example was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the example of the present invention, it has been described that the screw is operated by using the combined driving force of the two motors as the driving source in the injection molding machine, but the object to be operated can be applied to other than the screw. It is.

DESCRIPTION OF SYMBOLS 1 Injection unit 2 1st injection drive motor 3 2nd injection drive motor 4 Fixed plate 5 Movable plate 6 Rotating shaft part of 1st injection drive motor 7 1st drive pulley 8 2nd injection drive Rotating shaft portion of motor 9 Second drive pulley 10 First drive transmission pulley 11 Second drive transmission pulley 12 First phase difference adjustment pulley 13 Second phase difference adjustment pulley 20 First belt 21 Second belt Belt 22 First ball screw portion 23 First nut portion 24 First ball screw mechanism 25 Second ball screw portion 26 Second nut portion 27 Second ball screw mechanism 30 First drive transmission belt 31 Third drive transmission Belt 32 Second drive transmission belt 33 Fourth drive transmission belt

Claims (2)

An injection nozzle that injects molten resin into the mold cavity by advancing the screw in the heating cylinder;
First and second ball screw mechanisms for converting the rotational motion into a linear motion when the molten resin is injected from the injection nozzle to advance 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 first injection drive motor that rotationally drives the first drive transmission pulley;
A second injection drive motor for rotationally driving the second drive transmission pulley;
A first drive pulley fixed to a rotary shaft portion of the first injection drive motor;
An injection molding machine comprising: a second drive pulley fixed to a rotary shaft portion of the second injection drive motor;
A first phase difference adjusting pulley that is wound around a first belt that is wound around the first drive pulley and the first drive transmission pulley;
A second phase difference adjustment pulley that is wound around a second belt that is wound around the second drive pulley and the second drive transmission pulley,
The first phase difference adjusting pulley and the second phase difference adjusting pulley can be separately rotated and provided concentrically,
An injection molding machine comprising fastening means for locking the first phase difference adjusting pulley and the second phase difference adjusting pulley so as to be integrated. An injection nozzle that injects molten resin into the mold cavity by advancing the screw in the heating cylinder;
First and second ball screw mechanisms for converting the rotational motion into a linear motion when the molten resin is injected from the injection nozzle to advance 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 first injection drive motor that rotationally drives the first drive transmission pulley;
A second injection drive motor for rotationally driving the second drive transmission pulley;
A first drive pulley fixed to a rotary shaft portion of the first injection drive motor;
An injection molding machine comprising: a second drive pulley fixed to a rotary shaft portion of the second injection drive motor;
A first drive transmission belt wound around the first drive pulley and the first drive transmission pulley;
A second drive transmission belt wound around the second drive pulley and the second drive transmission pulley;
A first phase difference adjusting pulley that is wound around a third drive transmission belt that is wound around the first drive transmission pulley;
A second phase difference adjusting pulley that is wound around a fourth drive transmission belt that is wound around the second drive transmission pulley,
The first phase difference adjusting pulley and the second phase difference adjusting pulley can be separately rotated and provided concentrically,
An injection molding machine comprising fastening means for locking the first phase difference adjusting pulley and the second phase difference adjusting pulley so as to be integrated.

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