JPS61244520A - Motor-driven injection molding machine - Google Patents

Abstract

PURPOSE:To make the titled injection molding machine into one which does not become expensive even if a comparatively large capacity electric motor is used, by performing driving of injection action and mold clamping action by making use of two pieces of tiny motor-driven servomotors. CONSTITUTION:A shaft end of a screw 12 is fitted in a revolving shaft 13 and the revolving shaft 13 harmonizes with a revolving and advance or retreat action of the screw 12. 14 is a member bearing the revolving shaft 13 revolvably and screwing with a shaft 16 transmitting power of an electric motor 15 such as a servomotor fitted to a stationary member 19. Then when the shaft 16 is revolved positively or reversely by the electric motor 15, the member 14 moves in the lateral direction and the screw 12 connected with the member 14 advances and retreats within a barrel 11. 17 is an electric motor for revolving the screw 12 and the revolving shaft 13, that is, the screw 12 is revolved by a timing belt 18. As a plurality of units of tiny servomotors is used by making use of a large servomotor as above, the titled machine can be made inexpensive, tiny and light in weight.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a motor-driven injection molding machine.

[Prior art and its drawbacks]

This type of electric motor-driven injection molding machine is more energy efficient than conventional hydraulically driven injection molding machines, and has excellent responsiveness for speed and pressure control, allowing for highly accurate control. Recently, it has become widely used.

However, the price is very high, and if you also take into account the prices of drivers, amplifiers, etc., the price will rise rapidly if the capacity is large. Therefore, injection molding machines using large capacity electric motors have become much more expensive than injection molding machines using small capacity electric motors.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide an injection molding machine that is not expensive even if it uses a relatively large capacity electric motor.

[Key points of the invention]

In order to achieve the above-mentioned object, an injection molding machine uses two small electric servo motors, which have the capacity of one electric servo motor and are at least inexpensive, to drive the injection operation and the mold clamping operation. And so.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Reference numeral 11 denotes a barrel in which a screw 12 is inserted so as to be rotatable and movable in the axial direction.

I3 is a rotating shaft into which the shaft end of the screw 12 is fitted, and synchronizes with the rotation and forward/backward movement of the screw 12. 14 is a member that rotatably supports the rotating shaft 13, and is an electric motor 1 such as a servo motor attached to a fixed member 19.
It is screwed together with a shaft 16 that transmits the power of 5. Therefore axis 16
When the member 14 is rotated forward and backward by the electric motor 15, the member 14 moves forward and backward in the left and right directions in the figure, and the screw 12 connected thereto
move forward and backward within Barrel 1/Bar 11. Reference numeral 17 denotes an electric motor for rotating the screw 12, and a timing belt 18 rotates the rotating shaft 13, that is, the screw 12'? It is designed to rotate.

[Effect]

As explained below, since a plurality of small servo motors are used instead of one large servo motor, it is cheaper, and the assembled unit is smaller and lighter.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are views showing one embodiment of the present invention, and FIG. 1 is a plan view thereof. Figure 2 is a side view. Figure 3 is a rear view. 12...Screw, 13...Rotating shaft, 14...Member, 15.17...Electric motor, 16...Shaft, 19...
・Fixed member.

Claims (1)

[Claims] In an injection molding machine that converts the rotational motion of an electric motor into linear motion or an approximate motion thereof using a screw transmission mechanism or a link mechanism and transmits it to the drive system, each of the mold clamping operation drive system and the injection operation drive system, or either one of the An electric motor-driven injection molding machine characterized in that an operation drive system includes at least two electric servo motors.