JPH045305Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention mechanically stops the movement of the movable platen even if it moves in the mold closing direction due to a malfunction while the safety door is open. This relates to a mold clamping safety device for injection molding machines.

(Prior Art) As described in Japanese Utility Model Publication No. 45-18702, this type of device has a through hole opened in the mold opening/closing direction and a stop plate for opening and closing the through hole, which is connected to the upper part of a fixed platen. It has a structure in which a lock rod is protruded from the top of the movable platen facing the through hole, and an opening/closing plate of the stop plate is protruded from the upper end of the fixed platen side of the safety door. The protrusion length of the lock rod can be adjusted by turning the nut.

(Problems to be solved by the invention) In the conventional device described above, when adjusting the position of the lock rod every time the mold open/stop device is changed due to a mold change, the nuts screwed onto the outer periphery of the lock rod at the front and rear of the movable plate are used. The lock rod must be loosened with a wrench or the like to make it free, and after positioning, the lock rod must be tightened to fix the lock rod, which requires a lot of effort to adjust the lock rod position.

For this reason, even if an automatic mold changing device is adopted to shorten the mold changing time, it takes time to position the lock rod, and the molds have to be replaced frequently to produce a wide variety of products in small quantities. It has extremely disadvantageous problems in production.

This invention was devised to solve the above problems, and its purpose is to provide a new mold clamping safety device that can easily fix lock rods without using nuts or the like. .

(Means for Solving the Problems) This invention for the above-mentioned purpose is to provide annular grooves at regular intervals around the outer circumference of the lock rod, fit the lock rod into a support part on the upper part of the movable plate so that it can move forward and backward, and A pair of fastening plates that can be opened and closed to fit into the grooves and fix the lock rod, and an opening/closing device for the fastening plates are provided on the support part, and the opening/closing devices are connected by pins to the ends of the fastening plates on both sides of the fastening plate pivot. The above problem is solved by comprising an actuating plate, a rotating shaft having a cam groove that fits into a guide pin protruding from the actuating plate, and a handle member connected to the rotating shaft. It will be done.

(Function) In the above configuration, when the handle member is rotated, the cam groove also rotates together with the rotation shaft in the direction of rotation. This causes the guide pin to move together with the actuating plate to push or pull the fastening plate,
The fastening plate is moved to open or close using the pivot as a fulcrum. This movement of the fastening plate causes the lock rod to be free or fixed relative to the support.

(Example) In the figure, 1 is a fixed plate of a mold clamping device, 2 is a movable plate, 3 is a safety door, and 4 is a mold attached to the fixed plate 1 and the movable plate 2.

Above the fixed platen 1 and the movable platen 2, a supporting part 6 and a receiving part 7 of the lock rod 5 are protruded in the same position. Through holes 8 and 9 are provided extending in the direction.

In addition, a through hole 9 is provided in the vertical groove provided inside the receiving portion 7.
A stop plate 10 that opens and closes is mounted on a shaft so as to be able to move up and down, and a cam plate 10 that pushes down the stop plate 10 and opens the through hole 9 projects from the upper end of the fixed plate side of the safety door 4. There is.

A locking rod 5 having annular grooves 11 provided at regular intervals around the outer periphery is inserted into the through hole 8 of the support portion 6, except for the tip. Further, inside the support portion 6, as shown in FIGS. 4 and 5, there is a pair of fastening plates 1 that fit into the annular groove 11 of the lock rod 5.
A base plate 14 is attached to the base plate 14, in which the upper ends of the base plates 2 and 12 are pivotally connected to each other by a shaft 13 so as to be movable laterally with respect to each other. An actuating plate 17 having a guide pin 16 on its back surface that protrudes outward from a vertical hole 15 penetrated through the support part 6 is provided on the upper part of the fastening plates 12, 12, and is connected by pins 18 on both sides of the pivot. be.

A seat plate 19 is fixed to the upper part of the board 14,
A rotation shaft 21 having a cam groove 20 on its side surface which fits into the guide pin 16 is inserted vertically into the seat plate 19 . Further, a handle member 22 is attached to the upper end of the rotating shaft 21 via a member 23, and the above-mentioned fastening plates 12, 12 can be opened and closed with respect to the locking rod by means of the handle member 22. There is.

Note that 24 is a guide frame provided along the side of the base plate 14, 25 is a handle stopper, 26 is a stopper spring, and 27 is a stopper recess.

In the above structure, the state shown in FIGS. 4 and 5,
That is, when the handle member 22 is moved counterclockwise while the lock rod is fixed to the support portion 6 by the fastening plates 12, 12, the rotation shaft 21 is also rotated counterclockwise together with the member 23. .

As a result, the position of the cam groove 20 also changes, and the guide pin 16 moves upward along the cam groove 20. With this movement, the upper ends of the fastening plates 12, 12 are pulled, and gradually open laterally from the lower ends using the pivot shaft 13 as a fulcrum, and are removed from the annular groove 11.

When the fastening plates 12, 12 are removed, the lock rod 5 becomes free with respect to the support part 6, so the lock rod 5 can be pulled out or pushed in according to the mold thickness to freely adjust its protruding length. can.

Also, after making rough adjustments, the annular groove 11
When the handle member 22 is returned to its original position by aligning the position of the fastening plates 12, 12, the guide pin 14 is pushed back while the cam groove 20 also returns to its original position.

Due to the return of the guide pin 16, the actuating plate 17 also pushes back the fastening plates 12, 12, so that the fastening plates 1
2 and 12 move inward using the pivot 13 as a fulcrum, and fit into the annular groove 11 again to fix the lock rod to the support part 6.

(Effect of the invention) As described above, this invention provides annular grooves 11 at regular intervals around the outer circumference of the lock rod 5, and fits the lock rod 5 into the support part 6 on the upper part of the movable plate so that it can move forward and backward. A pair of fastening plates 12, 1 that can be opened and closed to fit the groove 11 and fix the lock rod 5.
2 and an opening/closing device for the fastening plates 12, 12 are provided on the support section 6, and the opening/closing device is connected to the fastening plate pivot 13.
An actuating plate 17 pin-coupled to the fastening plate ends on both sides of the
, a rotating shaft 21 having a cam groove 20 that fits into a guide pin 16 protruding from the operating plate 17 , and a handle member 22 connected to the rotating shaft 20 . The lock rod can be fixed or released from the cam groove and the movable platen by only rotating the member, making positioning of the lock rod easier than when fixing with nuts, reducing the time required for mold replacement work. can do. In addition, the engagement of the cam groove and guide pin connects the fastening plate side and the handle member side, ensuring that rotation of the handle member is transmitted to the actuating plate, allowing smooth opening and closing operations of the fastening plate. This has the advantage that the fastening plate will not open unless the handle member is rotated.

[Brief explanation of drawings]

The drawings show an embodiment of the mold clamping safety device of this invention. Figure 1 is a front view of the molding machine when the mold is closed, Figure 2
The figure is a front view of the molding machine when the mold is opened, FIG. 3 is a side view thereof, FIG. 4 is a longitudinal sectional front view of the main part, and FIG. 5 is a longitudinal sectional side view of the fastening plate portion. 1...Fixed plate, 2...Movable plate, 3...Safety door,
5... Lock rod, 6... Support part, 7... Receiving part, 8, 9... Through hole, 10... Stop plate, 11... Annular groove, 12... Fastening plate, 13...
Pivot, 14... Board, 15... Vertical hole, 16... Guide pin, 17... Actuation plate, 18... Pin, 20
...Cam groove, 21... Rotating shaft, 22... Handle member, 23... Member.

Claims (1)

[Scope of utility model registration request] A receiving part having a through hole opening in the mold opening/closing direction and a stop plate for opening and closing the through hole is provided on the upper part of the fixed plate, and a lock rod is provided protruding from the support part on the upper part of the movable plate so as to face the through hole. , in a mold clamping safety device in which the opening/closing plate of the stop plate is protruded from the upper end of the fixed platen side of the safety door, annular grooves are provided at regular intervals around the outer circumference of the locking rod, and the locking rod is supported by the upper part of the movable platen. A pair of fastening plates that can be freely opened and closed and that are fitted in the annular groove so as to be able to move forward and backward into the lock rod, and an opening/closing device for the fastening plates are provided on the supporting portion, and the opening/closing device is attached to the fastening plate. Consists of an actuating plate pin-coupled to the ends of the fastening plates on both sides of the pivot, a rotating shaft with a cam groove that fits into a guide pin protruding from the actuating plate, and a handle member connected to the rotating shaft. A mold clamping safety device for injection molding machines.