JPH08280951A - Air nipper - Google Patents

Abstract

PURPOSE: To dispense with time and labor required for finishing while not impairing the appearance of a product separated from an resin molded product by enabling cutting of a broad runner easily from sideways corresponding to the resin molded product inevitably turning out the broad runner in molding while preventing possible deviation in the position of cutting the runner and possible unevenness on an end face cut. CONSTITUTION: Both handle parts 21b and 22b of a nipper 2 having a pair of blade bodies 21 and 22 linked by a pivot 4 are bent downward almost at the right angle and one handle part 22b is fixed on one side of the upper end of a vertical cylinder 1 to mount the nipper 2 on the cylinder 1. Then, the other handle part 22b is made to stick into the cylinder 1 with the blade part 21a energized by a spring 6 in the direction of opening an edge part 21a. On the other hand, a piston 3 with the top surface thereof as inclined press playing surface 3a is provided liftable only and the lower end of the handle part 21b is brought into contact with the inclined press playing surface 3a being allowed to play by pressing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air nipper for an automatic machine, which is suitable for automatically and continuously cutting a runner between respective plastic molded products which are simultaneously molded in plural from one molding die. .

[0002]

2. Description of the Related Art Conventionally, an air nipper for cutting a runner of a plastic molded product has been used as an actual nip-opening machine 59-122873.
There was something shown in the issue.

As shown in FIG. 4, this air nipper has first and second cylinders 11 and 12 fixed to a base 13 for driving the nipper. Advance the cutter 14,
The piston 15 in the second cylinder 12 for retracting is
Actuated by compressed air, the first cylinder 11 having the cutter 14 attached to one side is retracted to bring the cutter 14 into contact with the cutting base of the runner Pa to be cut. The piston 17 in the first cylinder 11 pushes the handle 14a of the cutter 14 with a downwardly-decreasing cam surface 17a (inverted trapezoidal taper surface) on the front surface of the cam portion that is lifted by compressed air, and is moved by the blade 14a at the tip. The runner Pa is cut.

However, in this air nipper, since a straight rod-shaped cutter 14 is pivotally attached to one side of the first cylinder 11 by a pivot 16 in an X-shape, and a blade 14a of the cutter 14 is opened and closed upward, it is wide. Had a problem that it was difficult to cut the runner.

Therefore, as shown in FIG. 5, the blade tip of the cutter 18 is bent at a right angle, the runner Pa of the plastic molded product P is inserted between the cutter blades 18a and 18b, and both cutter blades 18a and 18b are driven (not shown). There is also a mechanism in which the runners Pa are driven by a mechanism so that the runners Pa are brought close to each other.

[0006]

The above-mentioned conventional air nipper, which is disclosed in Japanese Utility Model Laid-Open No. 59-122873, has the problem that the wide runner cannot be cut as described above and the range of use is limited. Had.

In the latter type shown in FIG. 5, the runner can be cut from the side thereof, so that a plastic molded product which must be a wide runner in terms of molding can be separated. In the same manner as in the above-mentioned conventional example, is pivotally mounted in an X-shape, and both cutter blades at the tips are rotated in a direction to approach each other to cut the runner.
Therefore, at the time of cutting, the plastic molded product that is the object to be cut is not accurately held at the cutting position due to bending or the like, and the runner's cutting position is misaligned or the cutting end surface is uneven and separated from the runner. There was a problem that the finished state of the product was damaged. For this reason, depending on the product, after cutting the runner, it is necessary to finish this cutting portion by hand using a file or the like, which requires manpower and has poor workability.

An object of the present invention is to solve the problems that the air nippers for cutting the runner of these conventional plastic products have.

[0009]

According to the present invention, in order to solve the above problems, a nipper in which a pair of blades is rotatably connected to a cylinder in which a piston driven by air pressure is tightly fitted. In the air nipper in which the nipper is driven by the piston, the nipper is rotatably connected to a pair of blade bodies having a blade portion and a handle portion, and the blade portion is a biasing means. The handle is bent downward at a substantially right angle, and one handle is fixed to one side of the upper end of the cylinder so that the other handle is positioned inside the cylinder. Mounted on this cylinder, the cylinder is vertical, and a piston having an inclined pushing surface on the upper side is slidably and non-rotatably tightly fitted inside the cylinder. The lower end of the handle that is , The blade portion of the nipper located on the upper side of the cylinder in response to vertical movement of the piston has to be opened and closed.

Further, a vertical cylinder of an air nipper for cutting the runner of the plastic molded product is slidably mounted on a base, and the lower end of the vertical cylinder is connected to the base side via a piston rod. The horizontal cylinder in which the above-mentioned piston is slidably fitted is arranged, and the nippers attached to the vertical cylinder are driven laterally together with this cylinder.

[0011]

The piston tightly fitted in the cylinder so as to be slidable and non-rotatable moves upward to push the handle portion on one side of the nipper which is in contact with the inclined pushing surface, whereby the blade of the nipper is pushed. The part is driven in the direction in which the cut is made. The handle of the nipper, which is fixed to one side of the upper end of the cylinder, holds one blade of the nipper immovably, and this blade holds the runner of the plastic molded product to be cut and positions it accurately. It works so that you can accurately position it.

Further, the handle of the nipper bent downward at a substantially right angle positions the blade of the nipper on the upper side of the cylinder and acts to cut the runner of the plastic molded product from the side. .

The horizontal cylinder arranged at the lower end of the vertical cylinder moves the vertical cylinder laterally to move the nippers attached to the vertical cylinder toward the cutting base of the runner. .

[0014]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention. As shown in the figure, in the air nipper for cutting the runner of the plastic molded product of the present invention, the nipper 2 is attached to the upper end of the vertical cylinder 1, and the piston 3 is tightly fitted in the cylinder 1. Like the conventional one, this nipper 2 has a pair of blade bodies 21 and 22 composed of blade portions 21a and 22a and handle portions 21b and 22b rotatably connected by a pivot shaft 4. In the invention, the handle 21
B and 22b are bent downward at a substantially right angle, and one handle 22
By fixing b to one side of the upper end of the cylinder 1, the nipper 2 is mounted on the cylinder 1 and the other handle 21b is projected into the cylinder 1.

Further, the piston 3 has an inclined pushing surface 3a formed on the upper portion thereof, and is tightly fitted in the cylinder 1 so as to be slidable and non-rotatable.
Is pressed downwards. Also, the lower part 1b of the cylinder 1
Communicates with the outside via the ventilation path 1a.

In FIG. 1, reference numeral 6 is stretched between the handle portions 21b and 22b of the nipper 2, and the blade portion 21 of the nipper 2 is provided.
The tension spring which urges a to open is shown.

Next, the operation of the air nipper for cutting the runner of the plastic molded product of the present invention having the above-mentioned structure will be described. First, the runner (not shown) of the plastic molded product to be cut is cut into the blade portions 21a, 22a of the nipper 2. Located in between and ready. Next, when compressed air is sent from the ventilation passage 1a to the lower portion 1b of the cylinder 1 by a compression pump (not shown), the piston 3 tightly fitted in the cylinder 1 is moved upward by the air pressure against the biasing force of the spring 5. Moving. At this time, the nipper 2 is attached to the inclined pushing surface 3a on the upper side of the piston 3.
Since the lower end of the handle 21b of the handle is in contact with the handle 21b,
As the piston 3 rises, b is rotated about the pivot 4 in the clockwise direction in the figure against the tensile force of the tension spring 6.
Therefore, one blade portion 21a of the nipper 2 has the other blade portion 22a.
Rotate in the a direction and cut the runner sandwiched between them.
At this time, the blade portion 2 of the blade body 22 attached to the cylinder 1
Since 2a does not move, it supports the runner to be cut above it until the cutting is complete. Therefore, it is possible to effectively prevent the plastic molded body to be cut from bending and being displaced.

When the supply of compressed air from the compression pump is stopped and the valve (not shown) is opened after the runner is cut off, the piston 3 is lowered by the urging force of the spring 5, and the air in the cylinder 1 is exhausted to the outside. To be done. Therefore, the blade body 21 pulled by the tension spring 6 rotates counterclockwise around the pivot 4 and returns to the original state, and a series of operations is completed.

Thus, in the air nipper for cutting the runner of the plastic molded product of the present invention, the lower blade portion 22a is used.
Since the runner is supported as a receiver and the runner is cut from the side of the runner, it is possible to cut a wide runner, and at the time of cutting, the plastic molded product bends and the position shifts, It is effectively prevented that the end face becomes irregular due to unevenness or the like.

FIG. 2 shows another embodiment of the present invention, in which blades 23, 24 connected by a pivot 4 are shown.
Are crossed in an X shape, and the handle 23b located outside is fixed to the other side of the cylinder 1. In this case as well, the lower blade portion 23a is fixedly fixed to the cylinder 1 side, and its operation is exactly the same as in the above example.

In FIG. 2, reference numeral 7 is elastically mounted between the handle portions 23b and 24b of the nipper 2, and the blade portion 24a of the blade body 24 is provided.
2 shows an elastic spring that urges the spring in the opening direction.

FIG. 3 is a cross-sectional view of an essential part showing a mechanism for moving the air nipper having the above-mentioned structure. As shown in the drawing, a cylinder 8 is arranged laterally below the vertical cylinder 1 of the air nipper, and the vertical cylinder 1 is slidably mounted on a base 9 and is tightly fitted to the cylinder 8. The formed piston 10 is mounted on the base 9 on the outside of the cylinder 8 via a piston rod 10a that is integral with the piston 10.
It is connected to the side.

When the vertical cylinder 1 to which the nippers 2 are thus mounted is slidably mounted on the base 9, after the plastic molded product is set at a predetermined position, the nippers 2 of the runner to be cut are set. It can be moved in the direction of the cutting base, which facilitates setting and enables more accurate cutting and removal of the runner.

[0024]

As described above, in the air nipper for cutting the runner of the plastic molded product of the present invention, the handle portion of the nipper is bent downward at a substantially right angle, and the blade portion is arranged laterally. It is possible to cut from one side, and it is easy to separate plastic molded products that must be a wide runner in terms of molding. Also, the blade of the nipper rotates only on one side, and the lower blade does not move.Therefore, the plastic molded product, which is the object to be cut, has its runner cut while being held on the lower blade. As a result, the plastic molded product does not bend or shift its position, so that the runner can be cut at the correct position without roughening the cutting end face. Therefore, the labor of finishing the separated plastic product is reduced.

Further, when this air nipper is mounted on the base so as to be movable in the lateral direction, the blade part of the nipper can be moved in the direction of the cutting base of the runner, so that the plastic molded product can be easily set at the cutting position. In addition, the cutting and removing of the runner can be performed more accurately.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an essential part of the air nipper of the present invention, which is capable of moving laterally.

FIG. 4 is a vertical sectional view of a conventional example.

FIG. 5 is a side view of another conventional example.

[Explanation of symbols]

 1 Cylinder 2 Nipper 3 Piston 3a Inclined Pushing Surface 4 Pivot 5 Spring 6 Tension Spring 21,22 Blade 21a, 22a Blade 21b, 22b Handle

Claims (2)

[Claims] 1. A nipper having a pair of blades rotatably connected to a cylinder in which a pneumatically driven piston is tightly fitted, and the nipper is driven by the piston. In the air nipper, in the nipper, a pair of blade bodies having a blade portion and a handle portion are rotatably connected, the blade portions are biased in an opening direction by a biasing means, and the handle portion is lowered substantially at right angles. The one handle is fixed to one side of the upper end of the cylinder so that the other handle is positioned in the cylinder and mounted on the cylinder. A piston having an inclined pushing surface on the upper side is slidably and non-rotatably tightly fitted inside, and the lower end of the handle located in the cylinder is brought into contact with the inclined pushing surface to raise and lower the piston. Located on the upper side of the cylinder accordingly Eanippa for runners cutting of plastic molding the blade portion of the nipper is equal to or adapted to be opened and closed. 2. A vertical cylinder is slidably mounted on a base, and a piston connected to the base side via a piston rod is slidably tightly fitted to the lower end of the vertical cylinder. 2. An air nipper for cutting a runner of a plastic molded product according to claim 1, wherein a horizontal cylinder is arranged, and the nipper attached to the vertical cylinder is driven laterally together with this cylinder. .