JPS58167143A - Ejector for molding - Google Patents

Abstract

PURPOSE:To obtain an ejector device capable of miniaturizing the size of a molding machine by using a system in which an ejector pin, a rotary driver, a rotary shaft, and a gear means are provided and combined in such a way as to enable them to perform specific actions. CONSTITUTION:A mold board 7 and a screw shaft 9 are integrally connected with each other through a member 11. When a rotary cylinder 8 turns clockwise by gears, the screw shaft 9 moves toward the mold-closing direction, but when it turns counterclockwise, the screw shaft 9 moves the mold-opening direction. By the movement of the screw shaft 9, the mold board 7 is also moved in closing or opening manner under the guidance of tie bars 6. A molding ejector device consists of the mold board 7, an ejector pin 12 provided piercingly at the center of the mold board 7 and the member 11, and a rotary driver 13 and a rotary shaft 14 provided at the lower end of the mold board 7. The rotary driver 13 is made up of a power-driven motor, a change gear and a reduction gear. The rotation of the motor is tramsmitted to the rotary shaft 14 by properly changing or reducing the speeds according to moldings and the ejector pin 12 is advanced or retracted by means of the rotary shaft 14. Also, the connection of the shaft 14 with the pin 12 is made by means of the gear means.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for ejecting a product molded by injection molding or the like from a mold.

A conventional molded product ejection device moves an ejection pin disposed on a mold plate forward and backward using a hydraulic reciprocating device. Normally, the hydraulic system is installed inside the mold platen or in the clamping ram of the mold platen (-1), so the structure of the mold plate to which the metal plate is attached is relatively complicated. , Also, the thickness of the part 1 is larger than that of the light.

Such defects are beyond the scope of large molding machines! -100 [-
However, with small molding machines that mold small products,
Compared to the injection device, mold clamping mechanism, etc., it is difficult to miniaturize the mold plate together with the ejector, so the conventional structure is used as is, and the thickness of the mold plate is made smaller according to the size of the molding machine. It is believed that further improvements are required.

The present invention was conceived in view of the above-mentioned circumstances, and aims to provide a molded product ejecting device that is extremely useful particularly in downsizing molding machines.

According to the present invention, the drive source for the protruding pins slidably disposed on the die plate of the mold clamping mechanism is a rotational drive device installed at a required location on the die plate. As this rotary drive device, an electric motor, a hydraulic motor, etc. can be used, and the rotational force from such a device is transmitted to the ejecting pin to move the ejecting pin forward and backward, making it possible to eject the molded product. It is something.

The present invention will be explained in detail below using illustrated examples.

■ indicates the mold clamping mechanism, 2 indicates the injection device, and 3 indicates the machine base.

The mold clamping mechanism 1 has a plurality of tie bars 6.6 installed over a pair of fixed plates 4 and 5, and is slidably attached to the tie bars 6.6 and rotatably attached to the mold plate 7 and the fixed plate 5. It consists of a mold clamping device 10 which is constructed of a rotary cylinder 8 which is attached and has a screw threaded on the inside, and a screw shaft 9 screwed into the rotary cylinder 8. When the rotary cylinder 8 is rotated clockwise by the gear, the screw shaft 9 moves in the mold closing direction, and when rotated counterclockwise, it moves in the mold opening direction. As the screw shaft 9 moves, the mold plate 7 also opens and closes using the tie bars 6.6 as a guide.

Thus, the molded product ejecting device includes an ejecting pin 12 inserted through the center of the mold platen 7 and the member 11, and a rotary drive device 13 and a rotating shaft 14 installed at the lower end of the mold platen 7. It is.

The rotational drive device ff13 is composed of an electric monitor, a speed changer, and a decelerator, and transmits the rotation of the electric motor to the shaft 14 by appropriately changing or decelerating the rotation according to the molded product, and transmits the rotation @14 to the shaft 14. The above protruding pin 12 is ・j? move backwards.

Further, the rotation shaft 14 and the protruding pin 12 are connected to each other by gear means. In the illustrated example, a rack 15 is attached to the rear side of the protruding pin 12, and a shaft 17 provided with a pinion 16 is connected to the rotary shaft 14, and the rack 15 and the pinion 16 mesh with each other, allowing the protruding pin to move forward and backward. I am moving, but
There is no particular limitation to such a structure.

The embodiment shown in FIG. 4 has a plurality of protruding pins 12, 12 in one
This figure shows the case where the book is moved forward and backward by holding the rotating shaft 14 of the book.

Although not shown in the figure, a sensor such as a proximity switch is attached to the tip of the rotating shaft 14, and the amount of rotation is detected and the protruding pin 1 is
20 stroke control can also be performed.

As described above, this invention uses a rotary drive device installed on the mold board to advance and retract the required number of protruding pins slidably disposed on the mold board, so the thickness of the mold board can be reduced compared to the conventional method. can be reduced.

In addition, the transmission mechanism from the rotary drive device to the protruding pin can also be simplified because gear means can be used, and there is no problem in miniaturizing the mold plate. Furthermore, since an electric motor or the like can be used as the rotational drive device, needle installation is facilitated, which is a very useful advantage in downsizing the molding machine.

[Brief explanation of the drawing]

The drawings illustrate the molded product ejecting device according to the present invention, and FIG. 1 is a side view of the mold clamping mechanism, FIG. 2 is a longitudinal side view of the ejecting device, and FIG. 3 is a longitudinal rear view of the ejecting device. 4
The figure is a schematic side view of another embodiment. 1... Mold clamping mechanism 2... Injection device 3... Machine base 4, 5... Fixed mold platen 6... Tie bar 7...・・・
・Mold board 10...Mold clamping device 11...
... Member 12 ... Protruding pin 13 ...
...Rotary drive device 14 ...Rotary shaft
15... Rack 16... Binion
17...Axis Figure 1 Figure 4 267

Claims (1)

[Claims] A required number of protruding pins slidably disposed on a mold platen of a mold clamping mechanism, a rotation drive device installed at a required location on the mold plate, and a rotation shaft provided between the rotation drive device and the protrusion pins; A molded product ejecting device characterized by comprising gear means that communicates the rotating shaft and the ejecting pin and moves the ejecting pin forward and backward by rotational force.