JP2003062856A - Electromotive many-material injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromotive many-material injection molding machine capable of sufficiently ensuring the attaching space of a nozzle driving motor. SOLUTION: In the electromotive many-material injection molding machine consisting of a main injection device and a sub-injection device (1b) and driving the advance and retreat of a nozzle (5b) through the ball screw nut (4b) fixed to the sub-injection device (1b) by transmitting the rotation of the nozzle driving motor (2b) to a ball screw (3b), the nozzle driving motor (2b) of the sub-injection device (1b) is arranged behind the sub-injection device (1b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric multi-material injection molding machine comprising a main injection device for a first material and an auxiliary injection device for a second material, and more particularly, a ball screw for advancing and retracting a nozzle. And an arrangement of a nozzle driving motor of an electric multi-material injection molding machine performed by a ball screw mechanism including a ball screw nut.

[0002]

2. Description of the Related Art Conventionally, there has been no electric multi-material injection molding machine, but only a hydraulic multi-material injection molding machine. An example of an electric injection molding machine for one material is as shown in FIG.

The injection device 1a is a ball screw 3a which is rotatably supported in parallel with the axis of the injection cylinder 12a.
And a ball screw nut 4a screwed onto the ball screw 3a. Ball screw nut 4
A moving frame is provided which is screwed to a and is movable in the injection direction together with the injection cylinder 12a. A nozzle 5a is attached to the tip end side of the injection cylinder 12a.

The rotation of the nozzle driving motor 2a is transmitted to the ball screw 3a to drive the nozzle 5a forward and backward via a ball screw nut 4a fixed to the injection device 1a. Attach the ball screw 3a to the fixed plate 1 at one end.
A second bracket 10a having a bearing structure, which is attached to a first bracket 9a for attaching a nozzle driving motor having a bearing structure, and the other end of which is attached to a bed 8a in the middle of the injection device 1a, at the lower portion of 3a. Is supported by.

The first bracket 9a is attached to the fixed platen 13a because there is a motor installation space for one motor in the lower part of the fixed platen 13a, and the motor itself is placed inside the bed 8a. This is because you can

The nozzle driving motor 2a is arranged below the first bracket 9a and transmits the rotation of the motor shaft to the ball screw 3a via the pulley 6a and the belt 7a.

A ball screw nut fixed to the injection device 1a by transmitting the rotation of the nozzle driving motor 2a mounted below the stationary platen 13a to the ball screw 3a via the motor shaft, the pulley 6a and the belt 7a. The injection cylinder 12a fixed to the ball screw nut 4a and the injection cylinder 12 by moving the 4a forward and backward.
The nozzle 5a fixed to the tip of a is moved forward and backward.

[0008]

However, in the above-mentioned conventional electric injection molding machine, since the nozzle driving motor 2a is arranged below the fixed platen 13a, an electric multi-material injection molding machine is constructed. In this case, since a plurality of nozzle driving motors must be arranged below the fixed platen 13a, it is difficult to secure a sufficient space for arranging the motors, and the structure of the mounting portion becomes complicated. There's a problem. Even if a plurality of nozzle driving motors are attached to one place below the fixed platen 13a,
Since the nozzle driving motors are densely packed, there are problems that mounting and maintenance work of the nozzle driving motors becomes difficult, and heat dissipation of the motors cannot be effectively performed. The present invention is intended to solve such a problem.

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the problems of the conventional ones described above, and provides an electric multi-material injection molding machine capable of sufficiently securing a mounting space for a nozzle driving motor. The purpose is to provide.

In the present invention, the nozzle driving motor is moved to the rear of the injection device, not below the fixed platen. The invention according to claim 1 of the present invention comprises a main injection device (1a) for the first material and a sub-injection device (1b) for the second material, and a nozzle drive motor (2
a, 2b) is transmitted to the ball screws (3a, 3b), and the injection cylinder (12a, 4b) is screwed through the ball screw nuts (4a, 4b) screwed to the ball screws (3a, 3b).
Nozzles (5a, 5b) arranged at the tip of a, 12b)
In the electric multi-material injection molding machine configured to move forward and backward, the nozzle driving motor (2b) of the sub-injection device (1b) is arranged behind the sub-injection device (1b). And

According to the second aspect of the present invention,
The ball screw (3b) of the sub-injection device (1b) is arranged so as to project from the rear of the sub-injection device (1b), and the nozzle drive motor (2b) is arranged below the sub-injection device (1b). The rotation of the motor shaft is transmitted to the ball screw (3b) via the pulley (6b) and the belt (7b).

In the invention according to claim 3 of the present invention,
A first bracket (9b) having a bearing structure is mounted on the lower bed (8b) on the nozzle (5b) side, and on the bed (8b) behind the auxiliary injection device (1b),
The second bracket (10b) having a bearing structure is attached, and the ball screw (3b) is attached to the first bracket (9).
b) and the second bracket (10b).

In the invention according to claim 4 of the present invention,
The nozzle drive motor (2b) is arranged so that its motor shaft faces the front nozzle (5b) side, and the nozzle drive motor (2b) is arranged in a space inside the bed (8b). To do. The reference numerals in the parentheses indicate corresponding members in the embodiments described later.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a sub-injection device showing an embodiment of the present invention, FIG. 2 is a plan view of an electric multi-material injection molding machine showing an embodiment of the present invention, and FIG. FIG. 4 is an enlarged view of a main part showing another embodiment, and FIG. 4 is a side view of a main injection device showing an embodiment of the present invention. It should be noted that the same parts as those described in the related art are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 2, the electric multi-material injection molding machine according to the embodiment of the present invention comprises a main injection device 1a for a first material and a sub injection device 1b for a second material. Injection cylinders 12a of the main injection device 1a and the auxiliary injection device 1b,
12b is arranged so as to be horizontal and V-shaped.

As shown in FIGS. 1 and 4, the main injection device 1a,
The sub-injection device 1b has the injection cylinders 12a and 12b.
Ball screw 3 rotatably supported in parallel with the axis of
A ball screw mechanism including a and 3b and ball screw nuts 4a and 4b screwed to the ball screws 3a and 3b, respectively. A moving frame which is installed by being screwed into the ball screw nuts 4a and 4b and is movable in the injection direction together with the injection cylinders 12a and 12b is provided. Injection cylinder 1
Nozzles 5a and 5b are attached to the tip ends of 2a and 12b.

The rotations of the nozzle driving motors 2a and 2b are transmitted to the ball screws 3a and 3b through a transmission mechanism including pulleys 6a and 6b and belts 7a and 7b, and fixed to the main and auxiliary injection devices 1a and 1b. Ball screw nut 4
The forward and backward movements of the nozzles 5a and 5b are driven via a and 4b.

In the embodiment of the present invention, the secondary injection device 1b for the second material will be described. Since the main injection device 1a for the first material has the same structure as the electric injection molding device described in the conventional technique, the description thereof will be omitted. In addition, in the conventional technology, since the injection molding machine for one material,
The injection device 1a is used. This is because the main injection device 1a has only one nozzle driving motor 2a and can be disposed below the fixed platen 13b, as in the conventional case.

In the embodiment of the present invention, the auxiliary injection device 1b is used.
The nozzle driving motor 2b is arranged behind the sub injection device 1b. Specifically, the ball screw 3b of the auxiliary injection device 1b is arranged so as to project from the rear of the auxiliary injection device 1b, and the rotation of the motor shaft of the nozzle drive motor 2b arranged below the auxiliary injection device 1b. Is transmitted to the ball screw 3b via the pulley 6b and the belt 7b.

A first bracket 9b having a bearing structure is mounted on the lower bed 8b on the nozzle 5b side, and a mounting bracket 11b is mounted on the end of the rear bed 8b of the auxiliary injection device 1b. Second bracket 1 having bearing structure in bracket 11b
0b is attached, and both ends of the ball screw 3b are respectively supported by the first bracket 9b and the second bracket 10b.

The first bracket 9b is not attached to the fixed platen 13b like the main injection device 1a.
Since the first bracket 9a of the ball screw 3a is attached to the fixed platen 13b on the main injection device 1a side, the first bracket 9b is similarly attached to the fixed platen 13b of the auxiliary injection device 1b.
However, since the structure of the lower part of the stationary platen 13b becomes complicated and the bracket may be difficult to mount and maintain, the first plate may be placed on the bed 8b below the nozzle 5b with sufficient space. Bracket 9
b is attached.

In this embodiment, as shown in FIG. 1, the motor shaft of the nozzle driving motor 2b is arranged facing the rear side, but the present invention is not limited to this, and as shown in FIG. Alternatively, the motor shaft of the nozzle driving motor 2b may be arranged so as to face the nozzle 5b side in the front, and the nozzle driving motor 2b may be arranged in the space inside the bed 8b.

In this embodiment, the sub injection device 1b is used.
Although only the description itself is given, it is of course possible that the main injection device 1a has the same configuration as the sub injection device 1b.

[0024]

As described above, according to the first aspect of the present invention, the nozzle driving motor of the sub-injection device is arranged behind the sub-injection device.
It is not necessary to dispose a plurality of nozzle driving motors below the stationary platen, and a sufficient space for disposing the motors can be secured. As a result, the structure of the mounting portion of the nozzle driving motor does not become complicated. Further, unlike the conventional case, it is not necessary to attach a plurality of nozzle driving motors to one place below the fixed platen, so that the nozzle driving motors are concentrated, which makes it difficult to attach and maintain the nozzle driving motors. Is eliminated, and the heat of the motor can be effectively dissipated.

In the invention according to claim 2 of the present invention, the nozzle driving motor is arranged so that the ball screw of the sub-injection device projects from the rear of the sub-injection device and is arranged below the sub-injection device. Since the rotation of the motor shaft of is transmitted to the ball screw via the pulley and belt,
Effectively, a sufficient space for arranging the motor can be secured, and the mounting portion of the nozzle driving motor can have a simple structure.

In the invention according to claim 3 of the present invention, the first bracket having a bearing structure is mounted on the lower bed on the nozzle side, and the first bracket having the bearing structure is mounted on the bed behind the auxiliary injection device. By mounting the second bracket and supporting the ball screw by the first bracket and the second bracket, there is an effect that the ball screw can be stably supported.

In the invention according to claim 4 of the present invention, the motor shaft of the nozzle driving motor is arranged so as to face forward,
By arranging the nozzle driving motor in the space inside the bed, the space inside the bed can be effectively used and the total length of the injection molding machine is shortened, so that the injection molding apparatus can be made compact. effective.

[Brief description of drawings]

FIG. 1 is a side configuration diagram of a sub injection device showing an embodiment of the present invention.

FIG. 2 is a plan view of the electric multi-material injection molding machine showing the embodiment of the present invention.

FIG. 3 is an enlarged view of a main part showing another embodiment of the present invention.

FIG. 4 is a side configuration diagram of a conventional electric injection molding machine and a main injection device showing an embodiment of the present invention.

[Explanation of symbols]

1a Injection device / main injection device 1b Sub injection device 2a, 2b nozzle drive motor 3a, 3b Ball screw 4a, 4b Ball screw nut 5a, 5b nozzle 6a, 6b pulley 7a, 7b belt 8a, 8b bets 9a, 9b First bracket 10a, 10b Second bracket 11b Mounting bracket 12a, 12b injection cylinder 13a, 13b Fixed plate

Claims (4)

[Claims] 1. A main material injection device (1a) for the first material and a sub-injection device (1b) for the second material. The nozzle driving motor (2a, 2b) is rotated by a ball screw (3a,
3b) and a nozzle (5a, 5b) arranged at the tip of the injection cylinder (12a, 12b) via a ball screw nut (4a, 4b) screwed to the ball screw (3a, 3b). In the electric multi-material injection molding machine configured to move forward and backward, the nozzle driving motor (2b) of the sub-injection device (1b) is arranged behind the sub-injection device (1b). An electric multi-material injection molding machine. 2. The ball screw (3) of the auxiliary injection device (1b).
b) is arranged so as to project from the rear of the auxiliary injection device (1b), and the rotation of the nozzle drive motor (2b) arranged below the auxiliary injection device (1b) is rotated by the pulley (6b) and the belt (b). The electric multi-material injection molding machine according to claim 1, characterized in that it is transmitted to the ball screw (3b) via 7b). 3. The electric multi-material injection molding machine according to claim 1, wherein the first bracket (9b) having a bearing structure is mounted on the lower bed (8b) on the nozzle (5b) side, and the secondary injection is performed. On the bed (8b) behind the device (1b),
The second bracket (10b) having a bearing structure is attached, and the ball screw (3b) is supported by the first bracket (9b) and the second bracket (10b). The electric multi-material injection molding machine described in 2. 4. The nozzle driving motor (2b) is arranged so that its motor shaft faces the front nozzle (5b) side, and the nozzle driving motor (2b) is arranged in a space inside the bed (8b). The electric multi-material injection molding machine according to any one of claims 1 to 3, characterized in that.