JP2000110901A - Drive device and injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rotate a plurality of rotary members synchronously without providing a synchronizing device separately. SOLUTION: When driving pulleys 5 and 6 are rotated by motors 1 and 2, for example clockwise, the rotation of the pulley 5 is transmitted to driven pulleys 10 and 11 through a belt 13 while the rotation of the other driving pulley 6 is transmitted to the driven pulleys 10 and 11 through another belt 14. Accordingly a pair of rotary members 8 and 9 is rotated clockwise synchronously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for rotating a plurality of rotating members in synchronization with each other by a plurality of driving motors, and an injection molding machine equipped with the driving device.

[0002]

2. Description of the Related Art As electric motor-driven injection molding machines become larger, two driving motors are used to rotate two rotating members of the same apparatus. In such a case, conventionally, as shown in FIG. 7, the driving pulleys 83 and 84 of the driving motors 81 and 82 and the rotating members 8
The timing belts 89 and 90 are wound around driven pulleys 87 and 88 of the driving motors 5 and 86, respectively,
2, the rotating members 85 and 86 are connected to the timing belts 89 and 9 respectively.
0, each of which is independently rotated.
As described in JP-A-128724, a driving pulley is directly connected to each rotating member, and each rotating member is also rotated independently.

[0003]

However, in any case, if the rotations of the drive motors 81 and 82 are synchronized only by the control system, when a failure occurs in the control system, the rotation between the plurality of rotating members may occur. Since an eccentric load occurs and causes a great hindrance,
There is a problem that some mechanical synchronization device must be provided, and the overall structure becomes complicated and the cost increases.
In addition, in the latter direct-coupled drive device, in addition to the above, in order to advance the pusher plate at a speed suitable for injection, it is necessary to operate the drive motor at a rotation speed smaller than the rated rotation speed. As described above, there is a problem that a driving motor having a large output is required.

Therefore, as shown in FIG. 8, one timing belt 91 may be wound around two driving pulleys 83 and 84 and two driven pulleys 87 and 88. By doing so, the above problem is temporarily solved, but the strength of the timing belt 91 is high and the length is long.
Is required, and the cost is increased in another aspect.

It is an object of the present invention to provide a drive device and an injection molding machine that can rotate a plurality of rotating members accurately and synchronously without separately providing a synchronization device. Another object of the present invention is to provide a drive device and an injection molding machine which are simple in structure and inexpensive.

[0006]

In order to achieve at least one of the above-mentioned objects, according to the present invention, a plurality of rotating members each having a driven pulley are driven by a plurality of driving motors each having a driving pulley. A driving device for rotating via the same number of belts as the driving motor wound around the driving pulley and the driven pulley, wherein each of the belts is driven by the same number of two or more driven pulleys and one driving It was configured to be wound around a pulley.

In the above means, the rotation of each drive motor is
Each is transmitted to two or more rotating members via one belt body. For this reason, each belt member also functions as a synchronization means, and all the rotating members rotate in synchronization with each other. Each belt body only transmits the rotation of the drive pulley of one drive motor to the driven pulleys of two or more rotating members, and is independent of the drive pulleys of the other drive motors. As compared with a case where the belt body is wound around a pulley, a belt body having a lower strength and a shorter length can be used.

[0008] In the above driving device, the number of the driving motor and the number of the rotating members can be two respectively. This configuration is the simplest driving device. Also,
Each of the drive motors can be a servo motor (claim 3). With this configuration, accurate control of the rotating member is possible.

According to a fourth aspect of the present invention, there is provided the driving motor, wherein a plurality of rotating members having a driven pulley are wound around the driving pulley and the driven pulley by a plurality of driving motors each having a driving pulley. In an injection molding machine equipped with a driving device for rotating via the same number of belt bodies, the driving device is the driving device according to any one of claims 1 to 3.

In the above means, when the plurality of drive motors are operated, the plurality of rotating members rotate accurately and synchronously with each other, and the operation of the injection molding machine by the drive device is performed smoothly and reliably.

In the above-described injection molding machine, the driving device is
It can be a driving device of a screw mechanism of a mold clamping device for moving the movable plate (claim 5). In this case, the plurality of rotating members of the screw mechanism rotate in synchronization with each other to move the movable plate of the mold clamping device.

Further, the driving device may be a driving device for a screw mechanism of the injection device for moving the pusher plate provided with the injection screw. In this injection molding machine, a plurality of rotating members of a screw mechanism rotate in synchronization with each other to move a pusher plate of the injection device.

[0013]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 and 2 show an embodiment of a driving device according to the present invention. Reference numerals 1 and 2 denote driving motors composed of electric motors such as servo motors. The drive motors 1 and 2 are supported side by side on a support member 4, and their output shafts 1a and 2a respectively have drive pulleys 5 and 6 respectively.
Having.

Under the driving motors 1 and 2, rotating members 8 and 9 such as rotating shafts are rotatably supported by the supporting member 4 and provided respectively. Each rotating member 8, 9 has a driven pulley 10, 11, respectively. The drive pulleys 5 and 6 of the respective drive motors 1 and 2 are disposed so as to be shifted in front and rear so as not to overlap with each other in a side view thereof, and the driven pulleys 10 and 11 are mutually separated in a side view thereof. The front and rear positions are aligned so as to overlap with each other, and are arranged so as to overlap with both drive pulleys 5 and 6 in plan view.

An endless belt body 13 such as a timing belt or a chain is wound around the drive pulley 5 of the drive motor 1 and the driven pulleys 10 and 11 of the rotary members 8 and 9. An endless belt body 14, such as a timing belt or a chain, is wound around the driving pulley 6 of the first embodiment and the driven pulleys 10, 11 of the rotating members 8, 9.

Incidentally, each pair of the driving motors 1 and 2, the driving pulleys 5 and 6, the rotating members 8 and 9, the driven pulleys 10 and 1
1, the belt bodies 13 and 14 are the same, respectively.
They are arranged symmetrically in a front view.

In the driving device A, when the driving motors 1 and 2 are operated to rotate the driving pulleys 5 and 6 in the same direction, for example, clockwise, the driving pulley 5 is rotated via the belt 13. The rotation of the other driving pulley 6 is transmitted to the driven pulleys 10 and 11 via another belt member 14 while being transmitted to the driven pulleys 10 and 11. Therefore, the pair of rotating members 8 and 9 rotate clockwise in synchronization with each other.

As described above, the belt members 13 and 14 transmit the rotations of the driving pulleys 5 and 6 to the driven pulleys 10 and 11, respectively, and also act as synchronization means to drive the driven pulleys 1 and 6.
Since the rotations of 0 and 11 are accurately synchronized, there is no need to provide a separate synchronization device. In addition, each belt body 13, 14
Is different from the belt-type driving device shown in FIG. 8 in that the power of the driving motors 1 and 2 is separately supplied to the rotating members 10 and 11 respectively.
Since it is only transmitted to the side, it is not necessary to use a belt body having extra strength and a long length.

In the drive device of the present invention, the number of the drive motors and / or the number of the rotating members can be three or more. Further, the driven pulleys 10 and 11 in the figure are
Although the winding portions 3 and 14 are integrated with each other, a plurality of winding portions may be separated from each other.

As the belt members 13 and 14, a timing belt is generally used. When a V-belt or a flat belt is used for the belt members 13 and 14, the amount of slip tends to be large. When the belt members 13 and 14 are formed as chains, the belt members 13 and 14 are easily stretched, so that a tension pulley is required and the structure becomes complicated. Although it is easy, a V belt, a flat belt, or a chain may be used. Needless to say, the drive pulleys 5 and 6 and the driven pulleys 10 and 11 may be timing pulleys, V pulleys, flat pulleys, chain wheels, or the like suitable for the type of the belt bodies 13 and 14. Also,
The drive motors 1 and 2 are usually servomotors having good controllability, but a general electric motor or a hydraulic motor may be used in some cases.

3 to 5 show an embodiment of the injection molding machine according to the present invention. In these figures, reference numeral B denotes a mold clamping device of an injection molding machine. The mold clamping device B movably supports a movable plate 27 to which a mold 26 is attached by four tie rods 24 integrally connecting a fixed plate 22 to which a mold 21 is attached and an end plate 23. , A torque mechanism 28 is provided between the movable platen 27 and the end plate 23, and the crosshead 3 of the torque mechanism 28 is
The movable platen 27 is moved by a pair of left and right screw mechanisms 31 actuated by the driving device A to move the movable platen 27 by clamping and opening.

The toggle mechanism 28 includes a pair of upper and lower toggle links 3 each having one end connected to the end plate 23 by a pin 33.
4, a pair of upper and lower toggle links 37 each having one end connected to the movable platen 27 with a pin 35 and the other end connected to the other end of a toggle link 34 with a pin 36;
A pair of upper and lower toggle links 40 respectively connected to the toggle link 34 and the crosshead 30 at 39;
Left and right pairs are provided. The screw mechanism 31 includes a pair of left and right ball screw shafts 42 rotatably supported by the end plate 23, and a pair of ball nuts 43 fixed to the crosshead 30 and screwed to the ball screw shaft 42. . The pair of left and right ball screw shafts 42 are parallel to each other.

The ends of the tie rods 24 on the end plate 23 side are screw shafts 24a, respectively.
Each of the nuts is screwed with a chain wheel 45 having a nut structure. And four chain wheels 45,
A drive chain wheel 47 of a motor 46 such as a servo motor fixed to the end plate 23 has a chain 4
When the electric motor 46 rotates the respective chain wheels 45 via the drive chain wheels 47 and the chains 48, the respective chain wheels 45 are rotated.
Move forward and backward in the axial direction of each tie rod 24 to move each tie rod 2 between the fixed platen 22 and the end plate 23.
The length of each of the four is finely adjusted. The tension of the chain 48 is adjusted by a tension pulley 50 that is moved in the radial direction by operating the handle 49.

The cross head 30 has a pair of left and right guide holes 30.
a, and these guide holes 30a are
The guide rods 52 are fitted to a pair of left and right guide rods 52 fixed to each other and are moved along the guide rods 52, 52.

The fixing plate 22, the end plate 23,
The configurations and operations of the movable platen 27, the toggle mechanism 28, the screw mechanism 31, and the like are well known. The drive device A is the drive device shown in FIGS. 1 and 2 as described above, except that the drive device A is upside down. Therefore, the same reference numerals are given to the same members and the like, and the detailed description is omitted. Omitted. In this mold clamping device B, the rotating members 8, 9 to be driven by the driving device A are the ball screw shafts 42, 42 of the screw mechanism 31, and the support member 4 of the driving device A is the end plate 23. I have.

In the mold clamping device B having the above configuration, when the drive motors 1 and 2 are operated, the pair of ball screw shafts 42 rotate in synchronization with each other, and the ball nuts 43 and
The crosshead 30 is moved along the guide rods 52, 52 together with 43, and the movable platen 27 is clamped or opened by the toggle mechanism 28 according to its own rotating direction, as is well known.

In the above, a pair of ball screw shafts 42
Are precisely rotated synchronously with each other,
Are moved synchronously with high precision, so that the toggle mechanism 28 operates smoothly to open and close the movable platen 27.

FIG. 6 shows another embodiment of the injection molding machine according to the present invention. In this figure, reference numeral C denotes an injection device of an injection molding machine. The injection device C movably moves a pusher plate 66 in which an injection screw 65 is rotatably mounted on a plurality of guide rods 64 integrally connecting a front plate 62 and a rear plate 63 to which a heating cylinder 61 is fixed. By supporting the pusher plate 66 and moving the pusher plate 66 forward together with the injection screw 65 by a pair of screw mechanisms 67 operated by the driving device A, the molten resin is discharged from the nozzle (not shown) of the heating cylinder 61. Type 2
1, 26 (see FIG. 3).

The screw mechanism 67 includes a ball screw shaft 69 rotatably supported at both ends by the front plate 62 and the rear plate 63, and a ball nut 70 fixed to the pusher plate 66 and screwed to the ball screw shaft 69. Consisting of Also in this case, the pair of ball screw shafts 69 are parallel to each other.

In the injection device C, the front plate 62, the rear plate 63, the pusher plate 66,
The configuration and operation of the screw mechanism 67 and the like are well known. Further, since the driving device A is the driving device shown in FIGS. 1 and 2 similarly to the case of the mold clamping device B, the same reference numerals are given to the same members and the like, and the detailed description is omitted. In the injection device C, the rotating members 8 and 9 to be driven by the driving device A are ball screw shafts 69 of a screw mechanism 67, and the support member 4 of the driving device A is a rear plate 63.

In the injection device C having the above configuration, when the drive motors 1 and 2 are operated, the pair of ball screw shafts 69 rotate in synchronization with each other, and the ball nuts 70 and
Along with 70, the pusher plate 66 is moved along the guide rods 64, 64 according to its own rotation direction.

Also in this case, the pair of ball screw shafts 59
Since the pair of ball nuts 43 are accurately and synchronously rotated to accurately and synchronously move with each other, the pusher plate 66 pushes the injection screw 65 to smoothly advance and inject the molten resin in the heating cylinder 61 into the molding cavity.

The screw mechanism 3 of the mold clamping device B and the injection device C shown in FIG.
Numerals 1 and 67 change the rotary motion into a linear motion, and rotate the ball screw shafts 42 and 69 to rotate the ball nut 4.
Although 3, 70 moves, a structure in which the ball screw shaft moves by rotation of the ball nut can also be used. In the case of the mold clamping device B and the injection device C of the injection molding machine, the drive motors 1 and 2 are usually servo motors, and the belt bodies 13 and 14 are timing belts. Drive A
The present invention can also be applied to, for example, an ejector device of an injection molding machine, and a nozzle touch device that moves the injection device C forward and backward with respect to the mold clamping device B.

[0034]

As described above, according to the present invention,
It is possible to provide a driving device and an injection molding machine that can accurately and synchronously rotate a plurality of rotating members with each other without separately providing a synchronization device. In addition, since there is no need to separately provide a synchronizing device, it is possible to provide a driving device and an injection molding machine which are simple in structure and inexpensive.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a driving device according to the present invention.

FIG. 2 is a side view of the driving device of FIG.

FIG. 3 is a front view showing an embodiment of the injection molding machine according to the present invention.

FIG. 4 is a side view of the injection molding machine of FIG.

FIG. 5 is a front view of a crosshead of the injection molding machine of FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the injection molding machine according to the present invention.

FIG. 7 is a front view showing a driving device of a conventional injection molding machine.

FIG. 8 is a front view showing another driving device.

[Explanation of symbols]

1, 2 drive motor 5, 6 drive pulley 8, 9 rotating member 10, 11 driven pulley 13, 14 belt body 27 movable plate 31 screw mechanism 42, 69 ball screw shaft (rotating member) 43, 70 ball nut 65 injection screw 66 Pusher plate A Drive device B Mold clamping device C Injection device

Claims (6)

[Claims] 1. A plurality of rotating members each having a driven pulley by a plurality of driving motors each having a driving pulley,
A driving device that is wound around the driving pulley and the driven pulley, and rotates through the same number of belt bodies as the driving motor, wherein each of the belt bodies has the same number of two or more driven pulleys and one A driving device, wherein the driving device is wound around a driving pulley. 2. The driving device according to claim 1, wherein the driving motor and the rotating member are each two. 3. The drive device according to claim 1, wherein each drive motor is a servo motor. 4. A plurality of rotating members having a driven pulley by a plurality of drive motors each having a driving pulley,
An injection molding machine equipped with a driving device that is wound around the driving pulley and the driven pulley and rotates through the same number of belt bodies as the driving motor, wherein the driving device is any one of claims 1 to 3. An injection molding machine comprising the driving device according to one of the above aspects. 5. The injection molding machine according to claim 4, wherein the driving device is a driving device for a screw mechanism of a mold clamping device for moving the movable plate. 6. The injection molding machine according to claim 4, wherein the driving device is a driving device for a screw mechanism of the injection device for moving a pusher plate provided with the injection screw.