JPH0227939Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an upper mold clamper used for fixing an upper mold to a slide of a press.

"Prior Art" Conventionally, an upper clamper as shown in FIG. 3 has been used for the slide of a press. That is, a main body 2 is fixed to the upper surface of the outer circumference of the slide 1, and a piston 3 is provided, which is adapted to be able to move up and down to a vertical hydraulic cylinder provided on the upper part of the main body 2, and which is raised by hydraulic pressure and lowered by a spring. A clamp rod 4 is rotatably provided at the forked part provided at the lower part of the extending piston rod, and an air piston 5 that goes in and out horizontally toward the side of the head of the clamp rod 4 is provided on the main body 2, and the air piston 5 is moved forward to close the clamp rod 4. When the air piston 5 moves backward, the clamp rod 4 is returned vertically to the clamp position by a return spring 6, and the piston 3 is raised by hydraulic pressure to fix the upper die to the lower surface of the slide 1.

``Problems to be solved by the invention'' The above-mentioned conventional upper-type clamper requires controlled supply of pressure oil and pressure air, so piping, solenoid valves for supply and discharge, and control circuits are duplicated. There were two drawbacks: the air cylinder part and the spring protruded from the front and rear of the upper mold clamper, and there were many protrusions. The object of the present invention is to eliminate these drawbacks and provide an upper clamper that requires only hydraulic piping, has no protrusions, has a good appearance, and requires less installation space.

"Means and actions for solving the problem" The structure of the present invention is that a vertical hydraulic cylinder is provided at the top of the main body, and a main piston for clamping and unclamping that is adapted to the vertical hydraulic cylinder and rises with pressure oil and descends with a spring. The lower part of the piston rod that extends below the main piston is bifurcated, and the clamp rod is pivotally connected thereto, and a swing spring and a return spring that act downward from the lower surface of the fork of the clamp rod toward the upper surface of the head of the clamp rod are provided. The return piston is characterized in that pressure oil to be supplied to the lower side of the main piston for clamping is supplied from an oil passage provided in the piston rod. Therefore, when pressure oil is supplied to the lower side of the main piston during clamping, the main piston is urged downward by the spring, so the return piston first descends and pushes the top surface of the clamp rod, causing the clamp rod to become vertical. It is swung back into position, at which time the swinging spring is compressed, and then the main piston is raised to clamp the upper die with the clamp rod. When unclamping, the operation is performed in the reverse order as described above, and the clamp rod is swung by the swing spring and removed from the upper mold.

Embodiment FIGS. 1 and 2 show the structure of an upper mold clamper 8 according to the present invention installed on the outer peripheral upper surface of the lower part of the slide 7 of a press. Upper clamper 8
The upper part of the main body 9 is a hydraulic cylinder, and the main piston 10 is adapted to move up and down. Pressure oil is supplied and discharged from the oil supply port 11 to the lower side of the main piston 10, and a spring 1 is connected to the upper side between the main piston 10 and the main body 9.
2 are provided. Therefore, the main piston 10 is raised by the hydraulic pressure and lowered by the biasing force of the spring 12. A vent hole 13 is provided in the main body 9 on the side of the spring 12.

The lower end of the piston rod 14 extending downward from the main piston 10 is a forked part 14a that is open toward the side of the slide 7, and the upper end of a clamp rod 16 is rotatably connected to this part by a pin 15. . The upper surface of the head of the clamp rod 16 becomes a horizontal plane when the clamp rod 16 is vertical, and the forked portion 14a of the piston rod 14
A return piston 17 that moves in and out toward the side surface of the slide 7 on the upper surface of the head of the clamp rod 16 is provided on the lower surface between the clamp rods 16 and 17 so as to be movable up and down. Return piston 1
The upper oil chamber of the piston rod 14 communicates with the lower oil chamber of the main piston 10 via an oil passage 18 provided in the piston rod 14. A semi-cylindrical member 19 parallel to the pin 15 is provided on the upper surface of the head of the clamp rod 16 on the opposite side of the slide 7, and a swing member is provided between the spring receiver of this semi-cylindrical member 19 and the lower surface between the forked portion 14a. A spring 20 is stretched.

A stopper 21 is provided on the main body 9 so as to face the upper side of the head of the clamp rod 16 on the side surface of the slide 7, so that the clamp rod 16 comes into contact with and stops at a vertical position. When the pressure oil in the oil supply port 11 is removed, the return piston 17 is moved by the swing spring 2
1, the clamp rod 16 swings to the position shown in FIG.

A dog 23 is provided on the side of the head of the clamp rod 16 opposite to the side surface of the slide 7, and a corresponding limit switch 24 is provided on the main body 9 to detect whether the clamp rod 16 is in a vertical position.

When the pressure oil in the oil filler port 11 is removed with the clamp rod 16 shown in the figure clamping the upper die 22 to the lower surface of the slide 7, the main piston 10, which is biased by the spring 12, descends first and releases the clamp of the clamp rod 16. Then, as the clamp rod 16 swings under the force of the swing spring 20,
The return piston 17 rises. The dog 23 separates from the limit switch 24 and detects that the clamp is released.

Conversely, when pressure oil is supplied to the oil filler port 11, the spring 12
The return piston 17 is lowered first by the action of , and the clamp rod 16 is swung to come into contact with the stopper 20 and become vertical. Subsequently, the main piston 10 compresses the spring 12 and rises, and the engaging portion 16a of the clamp rod 16 clamps the upper die 22. The dog 23 detects that the limit switch 24 is clamped.

``Effect of the invention'' As is clear from the above explanation, according to the invention, the piston rod is provided with a return piston, an oil passage, and a swing spring, so that it can operate only with the pressure oil piping and the piping and pressure oil supply. The practical effects and advantages are great, such as easier exhaust control, a better appearance with no protrusions on the upper clamper, and a smaller installation space.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view of the main part of the embodiment, FIG. 2 is a partially cross-sectional front view thereof, and FIG. 3 is a vertical cross-sectional side view of the main part of the conventional example. 1 is a slide, 2 is a main body, 3 is a piston, 4 is a clamp rod, 5 is an air piston, 6 is a return spring, 7 is a slide, 8 is an upper clamper, 9 is a main body, 10 is a main piston, 11 is an oil filler port, 12
13 is a vent, 14 is a piston rod,
14a is a fork, 15 is a pin, 16 is a clamp rod, 17 is a return piston, 18 is an oil passage, 19
20 is a semi-cylindrical member, 20 is a swing spring, 21 is a stopper, 22 is an upper die, 23 is a dog, and 24 is a limit switch.

Claims (1)

[Scope of Claim for Utility Model Registration] In an upper mold clamper provided for fixing an upper mold to the slide of a press, the clamper is adapted to be able to move up and down to a hydraulic cylinder on the upper part of the main body 9 fixed to the upper surface of the outer periphery of the lower part of the slide, and supplies hydraulic pressure. A main piston 10 that rises and descends with a spring 12, a piston rod 14 that extends downward from the main piston 10 through the oil chamber, and a horizontal pin 15 that extends parallel to the slide side at the lower end of the piston rod 14. A clamp rod 16 whose head is pivotally mounted; a return piston 17 which is provided in the lower end of the piston rod 14 so as to be freely protrusive and retractable downward, facing the slide side surface of the upper surface of the head of the clamp rod 16; , an oil passage 18 connecting the oil chamber on the lower side of the main piston 10 and the oil chamber on the upper side of the return piston 17, and an oil passage 18 extending between the top surface of the head of the clamp rod 16 on the side opposite to the slide side surface and the piston rod 14,
An upper clamper comprising: a swing spring 20 that swings and urges the clamp rod 16 from an upright position toward the side of the slide.