JPH1085998A - Toggle type pressurizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent one-side pressing onto an object to be formed by respectively attaching stoppers on tie bars and correcting the inclination of a moving platen caused by the horizontal swing of a toggle mechanism. SOLUTION: In a case of raising a moving platen 4 while being inclined caused on the swing of a toggle mechanism, any upper face of four corner parts is knocked on a pin 12b of corresponding stopper 12, and the pin 12b is begun to raise resisting the energizing force of a spring 12c. Then, with the reaction, the corner part is pressed downward, the force to correct the inclination of the moving platen 4 is generated. Succeedingly, when the moving platen 4 is continued to raise, the remaining corner parts are knocked one by one on each pin 12b of corresponding stopper 12, the reacting force corresponding to the inclination is received and the inclination is corrected perfectly. Therefore, the moving platen 4 is made in the parallel state and touched to the object to be press-formed. In such a way, the defective influence to the object caused on the one-side pressing can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toggle type pressurizing device used as an embossing table for injection molding.

[0002]

2. Description of the Related Art For example, a toggle type pressurizing device is used as an embossing table for injection molding. As shown in FIG. 5, a toggle-type pressurizing device connects a base 1 and a reaction plate 2 with a plurality of tie bars 3 and a plurality of movable platens 4 disposed between the base 1 and the reaction plate 2. The movable platen 4 is supported by a book tie bar 3 so as to be able to move up and down, and the movable platen 4 is connected to a lower drive head 5 via a toggle mechanism 6.

[0003] The toggle mechanism 6 is connected in a "-" shape so as to protrude inward, and two on each side having an upper end connected to the movable platen 4 side and a lower end connected to the base 1 side. , And one lever 6c on each side connecting the connection point between the levers 6a and 6b and the drive head 5. When the drive head 5 is driven upward, the two levers 6a and 6b on both sides open up and down, and the movable platen 4
Push up. As a result, the pressurized object 13 fixed to the lower surface of the reaction plate 2 is pressurized.

[0004] Such a toggle mechanism 6 is widely used in various pressurizing devices such as an embossing table for injection molding because the driving thrust can be easily increased by leverage.

[0005]

By the way, in the toggle type pressurizing device, the toggle mechanism 6 has a strong fixing force in the vertical direction, that is, in the driving direction, but in the horizontal direction perpendicular to the driving direction. Run-out is easy to occur. That is, as shown in FIG. 6, due to a slight inclination of the driving force applied to the driving head 5, the lever 6c is inclined to the left or right side, and the opening degree of the levers 6a and 6b becomes uneven.

If the deflection is large, the movable platen 4 is tilted, and a partial contact with the object 13 to be pressed occurs. When the pressurizing device is an embossing table for injection molding, the pressurized object 1
The occurrence of one-sided contact in the mold No. 3 has a serious adverse effect on molding accuracy and the like.

SUMMARY OF THE INVENTION It is an object of the present invention to correct a tilt of a movable platen due to a horizontal swing of a toggle mechanism and to prevent the movable platen from hitting against an object to be pressed, thereby avoiding an adverse effect on the object to be pressed. An object of the present invention is to provide a pressurizing device.

[0008]

A toggle-type pressurizing apparatus according to the present invention is a pressurizing apparatus main body which presses an object to be pressurized by a movable platen which is supported so as to be able to move up and down and is driven upward through a toggle mechanism. A plurality of movable platens that are provided at the same height above the movable platen and that elastically contact peripheral portions of the movable platen immediately before the movable platen comes into contact with the object to be pressed to correct the inclination of the movable platen. And a stopper.

When the rising movable platen is inclined, the movable platen elastically contacts one of the plurality of stoppers. Thereby, the movable platen receives a reaction force from the stopper. Then, the movable platen comes into contact with all the stoppers and receives a non-uniform reaction force corresponding to the inclination, whereby the inclination is corrected, and finally a uniform reaction force is received from all the stoppers. In this state, the movable platen still rises and hits the object to be pressed, thereby preventing the object from being hit against the object to be pressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the structure of a toggle-type pressurizing device embodying the present invention, FIG. 2 is a side view of the toggle-type pressurizing device, FIG. 3 is a structural explanatory view of a stopper, and FIG. FIG.

As shown in FIGS. 1 and 2, the pressurizing apparatus comprises a base 1 connected by four vertical tie bars 3.
And a reaction plate 2. These are mounted on a transfer stand 7. A movable platen 4 is arranged between the base 1 and the reaction plate 2. The movable platen 4 is supported by four tie bars 3 so as to be movable up and down.

On the other hand, the base 1 has a screw jack 8
Is attached. The screw jack 8 is driven by a motor 9 attached to the side of the base 1 to form a belt 10.
, Which is driven to rotate by a vertical shaft 1
To one axial motion. A drive head 5 is attached to a tip of the shaft 11, and the drive head 5 is connected to an upper movable platen 4 via a toggle mechanism 6.

As described above, the toggle mechanism 6 is connected in a “<” shape so as to protrude inward, and the upper end is connected to the movable platen 4 and the lower end is connected to the base 1. Two levers 6a, 6b on each side and levers 6a, 6
One lever 6c on each side connecting the connection point b to the drive head 5 is provided. When the drive head 5 is driven upward, the two levers 6a and 6b on both sides open up and down, and push up the movable platen 4.

The present pressure device is characterized in that stoppers 12 are respectively attached to the four tie bars 3 in the pressure device main body as described above. The four stoppers 12 are located at the same height above the movable platen 4, and hit the upper surfaces of the four corners of the movable platen 4 immediately before the movable platen 4 comes into contact with the pressurized object attached to the lower surface of the reaction plate 2. It has become.

As shown in FIG. 3, each stopper 12 has a holder 12a horizontally mounted on the tie bar 3, and a vertical pin 12b supported by the holder 12a so as to be movable in the axial direction. The pin 12b is prevented from coming off by the large diameter part at the upper end, and the large diameter part at the lower end and the holder 12a.
And is urged downward by a spring 12c disposed therebetween.

Next, the operation of the pressurizing apparatus will be described with reference to FIG.

When the movable platen 4 rises in a horizontal state, immediately before the movable platen 4 comes into contact with the pressurized object fixed to the lower surface of the reaction plate 2, the four corners of the four stoppers 12 It hits pin 12b simultaneously.
As the movable platen 4 continues to rise, 4
Each pin 12b of the two stoppers 12 has a spring 12c.
Rises synchronously against the biasing force of This allows
The movable platen 4 continues to rise while maintaining the parallel state,
Before the pins 12b reach the ascending limit, that is, in the process of ascending against the urging force of the spring 12c, they hit the object to be pressed and pressurize the object to be pressed.

When the movable platen 4 rises inclining due to the swing of the toggle mechanism 6, one of the upper surfaces of the four corners hits the corresponding pin 12b of the stopper 12, and the pin 12b is connected to the spring 12c. Begins to rise against the urging force of. Then, the corner is pressed downward by the reaction force, and a force for correcting the inclination of the movable platen 4 is generated. As the movable platen 4 continues to move upward, the remaining corners successively hit the corresponding pins 12b of the stoppers 12 and receive a reaction force corresponding to the inclination, whereby the inclination is completely corrected. Thus, the movable platen 4 is in a parallel state and hits the object to be pressed.

In order not to hinder pressurization of the pressurized object by the movable platen 4, the stroke of the pin 12b must be larger than the amount of rise of the movable platen 4 after the movable platen 4 hits the pin 12b. Also, spring 1
If the biasing force by 2c is weak, the inclination is not corrected until the movable platen 4 hits the object to be pressed. Conversely, if the urging force is too strong, there is a problem in that the pressure applied to the object to be pressed is reduced. The urging force of the spring 12c is represented by the total urging force when the movable platen 4 hits the object to be pressed, that is, when the spring 12c is contracted by the maximum amount,
The pressure is preferably 1 to 2%.

In the above-described embodiment, the stopper 12 is mounted by using the four tie bars 3 for connecting the base 1 and the reaction plate 2.
The number and mounting form of 2 are not limited to this. For example, the number of the stoppers 12 may be three or more.
Further, the structure of the stopper 12 is not limited to the above embodiment, but may be a cylinder type or the like.

[0021]

As described above, the toggle-type pressurizing device of the present invention comprises a plurality of stoppers which elastically contact a plurality of peripheral portions of the movable platen immediately before the movable platen comes into contact with the object to be pressed. Thereby, the inclination of the movable platen due to the horizontal deflection of the toggle mechanism is corrected, so that it is possible to prevent the pressurized object from hitting one side. Therefore, it is possible to avoid an adverse effect on the object to be pressed due to the one-side contact.

[Brief description of the drawings]

FIG. 1 is a front view showing the structure of a toggle-type pressurizing device embodying the present invention.

FIG. 2 is a side view of the toggle-type pressurizing device.

FIG. 3 is a structural explanatory view of a stopper.

FIG. 4 is a schematic view showing a tilt correcting function by a stopper.

FIG. 5 is a front view schematically showing a basic structure of a toggle-type pressurizing device.

FIG. 6 is a front view schematically showing a problem (inclination of a movable platen due to swing of a toggle mechanism) in the toggle-type pressurizing device.

[Explanation of symbols]

 Reference Signs List 1 base 2 reaction plate 3 tie bar 4 movable platen 5 drive head 6 toggle mechanism 12 stopper 12a holder 12b pin 12c spring 13 pressurized object

Claims (1)

[Claims] 1. A pressurizing device main body pressurizing an object to be pressurized by a movable platen supported up and down and driven upward through a toggle mechanism, and provided at the same height above the movable platen. A toggle-type processing device comprising: a plurality of stoppers for elastically contacting a plurality of peripheral portions of the movable platen immediately before the movable platen comes into contact with the object to be pressurized to correct the inclination of the movable platen. Pressure device.