JPS61237615A - Motor-driven injection molding machine - Google Patents

Abstract

PURPOSE:To enable injection and mold clamping actions without making use of a clutch and gear, by a method wherein a member A bearing a screw revolving shaft and a member B supporting both end parts of a plurality of pieces of shafts of the member A are provided and a plurality of electric motors is fitted to the member B. CONSTITUTION:A screw 12 is fitted to a barrel 11 in an insertion state revolvably and withdrawable in an axial direction, a shaft end of the screw 12 is fitted in a revolving shaft 13 and the barrel 11 and revolving shaft 13 are operated in conjunction with revolving, advancing and retreating actions of the screw 12. A member 14 supports the revolving shaft 13 revolvably and screws with a shaft 16 transmitting power of an electric motor 15 such as a servo motor fitted to a stationary member 19. When, therefore, the shaft 16 revolves positively or reversely by an electric motor 15, the member 14 advances and retreats in the right and left directions and then the screw 12 connected with the member 14 advances and retreats within the barrel 11. An electric motor 17 is so constituted that it makes the revolving shaft 13, that is, the screw 12 revolves by a timing belt 18.

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 conventional device, as shown in Fig. 4, injects the power of a servo motor by rotating or moving the screw 7 forward and backward through a clutch mechanism 2.3.4 and a transmission shaft 5.5 equipped with a rotating means such as a gear train. and mold clamping.

However, in conventional devices, although the response of the servo motor itself is very good, the use of gears, clutches, etc. as rotation means causes problems such as inertia due to the rotation of the gears, and problems such as clutch engagement and wear. Yes, the response was poor.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an injection molding machine driven by an electric motor that can perform injection and mold clamping operations without using clutches or gears, eliminating the drawbacks found in conventional devices as described above.

[Key points of the invention]

In order to achieve the above object, the present invention provides a screw shaft end fitted in a barrel for melting and injecting resin material.
A rotating shaft that is inserted and locked, rotates together with the screw, and advances and retreats in the axial direction, a member A that rotatably supports the rotating shaft, and is threadedly engaged with the member A and guides the forward and backward movements of the member A. and a plurality of shafts whose both ends are rotatably supported, and a member B that supports both ends of the shafts.
It consists of a plurality of electric pistons that engage with the plurality of shafts, respectively, and is attached to the correction member B, and is connected to the plurality of shafts through gears and clutches.
(This is a motor-driven injection molding machine in which the motor and the driven body are directly connected.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to FIGS. 1 to 3. Reference numeral 11 denotes a barrel and a screw 1.
2 is rotatably inserted and movable in the axial direction. ,
Reference numeral 13 denotes a rotating shaft into which the shaft end of the screw 12 is fitted, and synchronizes with the rotation and forward/backward movements of the screw 12. Reference numeral 14 denotes a member rotatably supporting the rotating shaft 13i, and an electric motor 1 such as a servo motor is 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 1 connected thereto
2 moves forward and backward within the barrel 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 1.
It is designed to rotate 2.

[Effect]

As explained above, there are no gears or clutches, the responsiveness of the servo motor can be maintained, and the mechanism is simple. Furthermore, since a plurality of small servo motors are used instead of one large servo motor, it is cheaper, and the assembly unit is smaller and lighter.

[Brief explanation of drawings]

1 to 3 are views showing an embodiment according to the present invention, in which FIG. 1 is a plan view thereof, FIG. 2 is a side view, FIG. 3 is a rear view, and FIG. 4 is a diagram of a conventional device. 12...Screw, 13...Rotating shaft, 14...Member, 15.17...Electric motor, 16...Shaft, 19...
・Fixed member.

Claims (1)

[Claims] A rotating shaft that inserts and locks a screw shaft end fitted into a barrel for melting and injecting resin material, rotates in synchronization with the screw, and advances and retreats in the axial direction, and rotates the rotating shaft. A member A that can be supported, a plurality of shafts that are screwed together with the member A, guide the forward and backward movements of the member A, and have both ends rotatably supported, and both ends of the plurality of shafts. A motor-driven injection molding machine comprising: a member B that supports each part; and a plurality of electric motors that are respectively engaged with the plurality of shafts and are attached to the member B.