JPH0139542Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mold clamping device having a molded product ejecting mechanism for releasing an injection molded product from the mold after opening the mold.

As a means of ejecting a molded product using mold opening force, a device in which an ejector rod is inserted into a threaded rod that is threaded into a sliding tube that opens and closes a mold has been published in Japanese Patent Publication No. 51-51.
It is disclosed in Publication No. 13495.

In this conventional structure, since the screw rod is fixed to the sliding tube, it is possible to adjustably insert the ejector rod into the screw rod to eject the molded product. If the plate and the screw shaft for opening and closing move together, the molded product cannot be ejected using the mold opening force even if the ejector rod is attached to the screw shaft.

For this reason, in a mold clamping device in which a movable platen and a screw shaft are integrally connected, a hydraulic cylinder, an electromagnetic device, or the like is used to eject the molded product. This hydraulic cylinder or electromagnetic device is not only more complicated and expensive than a case that uses mold opening force, but also requires space for installation, so it is not used in the mold clamping device of small molding machines. It had some serious flaws.

This idea allows the molded product to be ejected using the mold opening force even if the movable platen and the screw shaft move together in the mold opening/closing direction. To provide a protrusion device with a new structure that allows the amount of protrusion to be arbitrarily adjusted even though the protrusion rod penetrates the board.

The features of this invention for the above purpose are that a movable plate is provided between a pair of fixed plates, a rotating member is provided on one of the fixed plates, and a screw shaft is screwed into the rotating member and has its tip connected to the movable plate. In a mold clamping device that clamps a mold by moving the movable platen forward and backward relative to the other fixed platen, a molded product that is movable with respect to the screw shaft and the movable platen is provided from the rear end of the screw shaft to the movable platen. A protruding rod is inserted therethrough, and a receiving member of the protruding rod is attached to one of the fixed plates, and is provided at a required distance outside the rear end of the screw shaft.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a mold clamping device, which has tie bars 5, 5 installed on a pair of fixed plates 3, 4 on a machine stand 2, and a movable plate 6 movably attached to the tie bars 5. Molds 7 and 8 are provided on opposing surfaces of the other stationary platen 4 and movable platen 6, respectively, and a screw shaft 9 is provided protruding from the opposite surface of the movable platen 6. This screw shaft 9 is screwed into a rotating member 10 which is rotatably attached to one of the fixed platens 3, and a gear 11 is attached to the rotating member 10. When the movable platen 6 rotates, the screw shaft 9 moves together with the movable platen 6 by the screw lead.

Reference numeral 12 denotes a transmission shaft, which is rotatably supported at the lower part of the fixed plates 3 and 4, and has a transmission gear 13 at its outer end that is close to the fixed plate 3 and meshes with the gear 11;
The inner end is a spline shaft 14 for connection to a transmission shaft on the injection device side.

15 is a protruding rod with a screw shaft 16 at the rear;
The movable platen 6 is inserted from the rear end of the screw shaft 9 into a hole bored at the center of the movable platen 6 and the screw shaft 9 with both ends protruding.
It is movably penetrated throughout. The rear end of this protruding rod 15 is attached to the fixed platen 3, and is attached with a nut 18 in the center of a receiving member 17 which also serves as a gear cover and is provided at a required distance outside the rear end of the screw shaft 9. It is connected.

Due to this connection, the protruding rod 15 is fixed to the movable platen 6 and the screw shaft 9, and the tip of the protruding rod 15 protrudes from the movable platen 6 only when the mold is opened, as shown by the solid line.

Further, the amount by which the protruding rod 15 protrudes from the movable platen 6 can be adjusted as desired by the screw shaft 16 and the nut 18.

In the embodiment shown in FIG. 2, the screw shaft 1 of the receiving member 17 is
The insertion hole 17a of No. 6 is formed into a tapered screw hole, and the fastening ring 19 having the split groove 19a is screwed into the insertion hole 17a.
When the protruding rod 15 is fixed by
When an unreasonably large pressure is applied to the protruding rod 15, a slip occurs between the protruding rod 15 and the fastening ring 19.
acts as a resistance to prevent undue pressure from acting on the mold or receiving member.

Further, in the embodiment shown in FIG.
In this case, a spring member 20 is provided on the movable platen 6 side to separate the screw shaft 16 from the rear screw shaft 16 and always press the protruding rod 15 inside the screw shaft 9 backward, and after the rear end comes into contact with the screw shaft 9, Due to the action of the mold opening force, the protruding rod 1
5 projects the molded product against the spring member 20. In such a structure, since the ejector rod 15 moves together with the screw shaft side until it comes into contact with the receiving member side, there is no resistance from the ejector rod 15 during mold closing and ejection of the molded product. Therefore, compared to the case where the protruding rod 15 is connected to the receiving member 17,
Penetration to the screw shaft 16 becomes easy, and it is effective for mold clamping devices with long opening/closing strokes.

As mentioned above, this idea consists of a pair of fixed plates 3 and 4.
A movable platen 6 is provided in between, and a rotary member 10 provided on one fixed platen 3 and a screw shaft 9 screwed into the rotary member 10 and connected to the movable platen 6 at the tip end, the movable platen 6 In the mold clamping device 1 that moves to open and close, a protruding rod 15 of a molded product that is movable is inserted from the rear end of the screw shaft 9 to the movable platen 6, and the protruding rod 15 is inserted into the screw shaft 9 and the movable platen 6. Attach the receiving member 17 to one of the fixed plates 3,
Since the screw shaft 9 is provided at a required distance outward from the rear end of the screw shaft 9, even if the screw shaft moves together with the movable platen, the protrusion rod inside the screw shaft ensures that the molded product will be ejected when the mold is opened. It can be performed. In addition, since the ejector rod can be adjusted at the receiving member, it is easy to adjust the amount of ejection that differs depending on the mold.Moreover, the ejector rod does not necessarily need to be fixed to the receiver member, so it can be installed according to the mold clamping device. becomes possible,
It is safe because any undue pressure on the ejector rod can be dealt with before it is transmitted to the mold or the like. Furthermore, it has many features such as the ability to use the receiving member as a cover for the screw shaft.

[Brief explanation of drawings]

The drawings show an embodiment of a mold clamping device having a molded product ejecting mechanism according to this invention. Fig. 1 is a longitudinal sectional view of the main part of the mold clamping mechanism, and Fig. 2 is a longitudinal sectional view of the main part of another embodiment. 3 are longitudinal sectional views of main parts of still another embodiment. 1... Mold clamping mechanism, 3... One fixed plate, 4...
Other fixed plate, 6... Movable plate, 9... Screw shaft, 1
0...Rotating member, 15...Protruding rod, 16...Screw shaft, 17...Receiving member.

Claims (1)

[Scope of utility model registration request] A movable plate is provided between a pair of fixed plates, and a rotating member provided on one fixed plate and a screw shaft screwed into the rotating member and having its tip connected to the movable plate are used to move the movable plate to the other fixed plate. In a mold clamping device that moves forward and backward with respect to a fixed platen to clamp the mold, a protruding rod of a molded product that is movable is inserted from the rear end of the screw shaft to the movable platen, and the protruding rod is inserted into the screw shaft and the movable platen. Attach the rod receiving member to one of the above fixed plates,
A mold clamping device having a molded product ejecting mechanism, the mold clamping device being provided at a required distance from the rear end of a screw shaft.