JPH0719416Y2 - Pneumatic tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pneumatic tool such as an air nipper.

(Prior Art) For example, there is an air nipper for cutting a runner of a plastic molded product as shown in FIG. In the figure, an air nipper 51 includes a tool body 52, a cutter 53,
A cutter advance / retreat piston 54 and a cutter opening / closing piston 55 are provided. The tool main body 52 includes a cylinder 56, front and rear lids 57 and 58 fixed to the front and rear of the cylinder 56, and a cutter advancing / retreating piston 5.
4 and a guide rod body 59, and the inside is a first cylinder chamber 60. An insertion hole 61 is formed in the front lid 57, a cutter advancing / retracting air supply passage 62 is formed in the rear lid 58, and a rod body 59 is fitted and fixed in the first cylinder chamber 60 as a protrusion. A cutter opening / closing air supply passage 63 is formed in the rod body 59.

The cutter advancing / retreating piston 54 has a tubular portion 64 and a plug body 65,
The cylindrical portion 64 is provided in the first cylinder chamber 60 of the tool body 52 so as to be slidable in the front-rear direction, and the plug body 65 is fitted and fixed to the rear portion of the cylindrical portion 64 and slides in the front-rear direction on the rod body 59. It is fitted freely. In addition, the front portion of the cylindrical portion 64 is the front lid of the tool body 52.
The cutter 53 is inserted into and supported by the insertion hole 61 of 57 so as to be slidable in the front-rear direction, and the cutter 53 is pivotally supported via a pivot 66. A second cylinder chamber 67 is formed inside the piston 54, and a cutter opening / closing piston 55 is slidably provided in the second cylinder chamber 67 in the front-rear direction.
Is formed, and the inner surface of the recess 68 is a cam surface 69 that is gradually narrowed toward the rear.

Further, the cutter 53 has a pair of clamping rods 7 having a blade portion 70a at the tip.
It is formed by cross-polymerizing 0's with each other, and supporting the overlapped portion with a pivot 66. 71 is a spring for urging the cutter 53 in the expanding direction.

Then, in the state shown in FIG. 4, the cutter advancing / retreating piston in the first cylinder chamber 60 from the cutter advancing / retreating air supply passage 62.
When air is supplied to the back surface of the cylinder 54, the piston 54 slides forward in the first cylinder chamber 60 and on the rod body 59 to advance the cutter 70, and then the cutter opening / closing air supply passage 63 to the second cylinder chamber 67. When air is supplied to the rear surface of the cutter opening / closing piston 55, the piston 55 slides forward in the cylinder chamber 67 and the cutter surface 69 causes the cutter 70 to close.

(Problems to be Solved by the Invention) In the conventional device, the air supply passage 63 for opening and closing the cutter is used.
Is formed on the rear lid body 58 of the main body 52, on the rod body 59 which is provided in the first cylinder chamber 60 so as to project and also has the plug body 65 of the cutter advancing and retracting piston 54 penetrating therethrough.
When manufacturing the cutter, the cutter advancing / retreating piston 54 must be aligned with the tool body 52 as well as with the rod body 59, and the rod body 59 is aligned with the rear lid body 58 of the body 52. This must be taken into consideration, and it is difficult to align the members when manufacturing the air nipper 1, and the rod body 59 also increases the number of parts.

Therefore, an object of the present invention is to provide a pneumatic tool in which the number of parts is reduced and manufacturing is facilitated.

(Means for Solving the Problem) The technical means taken by the present invention to achieve the above-mentioned object is that a middle portion of a pair of pinching rods is pivotably attached to a first cylinder chamber formed in a tool body. A pinching tool advancing and retracting piston provided with a pinching tool that is supported is slidably provided, and a pinching tool opening and closing piston is slidably provided in a second cylinder chamber formed in the piston. A pneumatic tool having an air supply passage for advancing / retreating a pinching tool to the back of the piston in the cylinder chamber is formed in the tool body, and an air supply passage for opening / closing the pinching tool from the outside to the back of the piston in the second cylinder chamber is provided. The air supply passage for opening and closing the clamp is formed in the tool main body by reaching the gap for air circulation formed between the inner surface of the first cylinder and the outer peripheral surface of the piston for advancing and retracting the clamp, and reaching the gap from the outside. First
It is composed of an air flow passage and a second air flow passage formed in the piston for advancing and retracting the pinching tool from the void portion to the second cylinder chamber.

(Operation) In the pneumatic tool 1, the air is supplied to the back surface of the piston 14 of the first cylinder chamber 6 from the air-pressurizing tool advancing / retreating air supply path 8, so that the piston 14 slides to move the pressure tool 34 forward. By supplying air to the back surface of the piston 38 of the second cylinder chamber 18 from the air supply passage 32 for opening and closing the clamp member, the piston 38 slides to close the clamp member 34. The pinching tool advancing / retreating air supply path 8 is formed in the tool body 2, and the pinching tool opening / closing air supply path 32 is between the inner surface of the first cylinder chamber 6 and the pinching tool advancing / retreating piston 14 outer peripheral surface. Formed on the tool body 2 from the outside to the cavity 25, and from the cavity 25 to the second cylinder chamber 18 on the pinching tool advancing and retracting piston 14. And a second cylinder flow passage 31 formed in the second cylinder flow passage 31. A member that protrudes from the tool body into the first cylinder chamber and penetrates the piston for advancing and retracting the pressure clamp is formed in order to form an air supply passage for opening and closing the pressure clamp. Not required separately.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 is an air nipper (a pneumatic tool) used for cutting a runner of a plastic molded product, which is a tool main body 2, a cutter 34 (clamping tool), and a cutter advancing / retracting piston. 14 and a cutter opening / closing piston 38.

The main body 2 is a cylindrical body 3 which is attached to a work table or the like and which is open in the front and rear.
And the front and rear lids 4,5 which are bolted to the front and rear of the cylinder 3.
And. The cylindrical body 3 has a rectangular parallelepiped outer shape, and has a circular hole inside to form a first cylinder chamber 6. Front lid 4
An insertion hole 7 is formed in the through hole 7, and the insertion hole 7 has a substantially oval shape with flat upper and lower surfaces. Reference numeral 8 denotes an air supply passage for advancing and retracting the cutter, which constitutes a passage from the port 10 at the center of the rear end of the rear lid 5 to the rear end of the first cylinder chamber 6. 9 is the first
In the air flow passage, the rear cover 5 passes through the rear cover 5 from the port 11 at the lower rear end of the rear cover 5, and further passes through the rear lower part of the cylinder 3 to form the first cylinder chamber 6
A peripheral groove 13 is formed at a position corresponding to the first cylinder chamber 6 side port 12 of the first air flow passage 9 on the inner surface of the cylindrical body 3, which constitutes a passage leading to the intermediate portion.

The cutter opening / closing piston 14 is slidably provided in the first cylinder chamber 6 of the tool main body 2 in the front-rear direction, and includes a cylinder body 15, a cutter mounting portion 16, and a plug body 17. The cylindrical portion 15 has a substantially cylindrical shape, and the inside is a second cylinder chamber 18, and the upper and lower surfaces of the outer peripheral front portion of the cylindrical portion 15 are flat sliding surfaces 19, so that the insertion hole for the front lid body 4 of the tool body 2 is formed. 7 is slidably inserted in the front-rear direction, and a step portion 20 is formed at the rear end of the sliding surface 19. Also, the cylinder
15 A spring receiving portion 21 is formed in the middle portion of the outer circumference over the entire circumference,
A return spring 22 is compressed between the spring receiving portion 21 and the front lid 4. Further, seal ring grooves 23a and 23b are formed in the rear end portion of the outer periphery of the tubular portion 15 and the rear surface side of the spring receiving portion 21, respectively, to form seal rings 24a and 24b, and the first cylinder between these seal rings 24a and 24b. Between the inner surface of the chamber 6 and the outer peripheral surface of the tubular portion 15, there is a void portion 25 for air circulation over the entire circumference, and the first air flow passage 9 formed in the tool body 2 is inserted into this void portion 25 and the void. An air circulation passage 26 is formed in the front portion of the portion 25 so as to penetrate the tubular portion 15 in the radial direction, and a circumferential groove 27 is formed in the inner surface of the tubular portion 15 at a position corresponding to the passage 26.

The plug body 17 is fitted and fixed to the rear portion of the tubular portion 15 with the second cylinder chamber 18 closed, and a recess 28 is formed from the front side, and
A peripheral groove 29 facing the peripheral groove 27 on the inner surface of the tubular portion 15 is formed on the outer peripheral surface of the plug body 17. Further, the plug 17 is provided with an air passage 30 extending from the circumferential groove 29 to the position of the bottom of the recess 28 of the second cylinder chamber 18. The passages 26, 30 and the circumferential grooves 27, 29
Thus, a second air flow passage 31 extending from the gap 25 between the first cylinder chamber 6 and the piston 14 to the second cylinder chamber 18 is formed. The second air flow passage 31, the gap 25 and the tool body 2 are formed. The first air flow passage 9 constitutes a cutter opening / closing air supply passage 32.

The cutter mounting portion 16 is composed of a tubular portion 15 or a pair of upper and lower support walls 33 integrally formed to project forward, and a cutter 34 is provided between the support walls 33.

The cutter 34 overlaps the middle portions of a pair of clamping rods 35 having a blade portion 35a at the tip with each other to be superposed, and the superposed portion is pivotally supported by the support wall 33 via a pivot 36. Reference numeral 37 is a spring that biases the cutter 34 in the expanding direction.

The cutter opening / closing piston 38 is provided in the second cylinder chamber 18 of the cutter advancing / retreating piston 14 so as to be slidable in the front-rear direction, and has a recess 39 formed from the front side, and the inner surface of the recess 39 is gradually narrowed toward the rear. The cam surface is 40. Also the piston
A spring receiving portion 41 is formed on the entire outer circumference of 38, and a return spring 42 is interposed between the spring receiving portion 41 and the rear surface of the support wall 33 of the cutter mounting portion 16 in a compressed manner.

In the above structure, in order to cut the inner protruding from the plastic molded product, the runner is positioned in front of the cutter 34 in the standby state of the air nipper 1 shown in FIG. When air is supplied to the rear surface of the piston 14 in the cylinder chamber 6, the piston 14 moves forward against the return spring 22 to move the cutter 34 forward as shown in FIG. By contacting the body 4, the forward movement of the piston 14 is restricted, and the blade portion 34 of the cutter 34
The runner is located between a. At this time, the first cylinder chamber 6 side port 12 of the first air flow passage 9 formed in the tool body 2
Is located at the rear end of the void portion 25.

Next, when air is supplied to the cutter opening / closing air supply passage 8,
As shown in FIG. 2, the air passes from the first air flow passage 9 through the gap 25 to the second air flow passage 31 and passes through the second cylinder chamber.
The piston 38 is supplied to the rear surface of the piston 38, and the piston 38 is moved forward against the return spring 42.
Is closed and the runner is disconnected. After that, if the air supply is stopped and released, the return springs 22 and 42 return the initial position.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the pinching tool may be another cutting tool, pliers, pliers, or the like.

(Effects of the Invention) According to the present invention, the air supply passage for opening and closing the clamp is formed with an air circulation space formed between the inner surface of the first cylinder and the outer circumference of the piston for advancing and retracting the clamp, and from the outside. Since it is composed of a first air flow passage formed in the tool body reaching the void and a second air flow passage formed in the piston for advancing / retracting the pinching tool from the void to the second cylinder chamber, the conventional air flow passage is provided. Since it is not necessary to provide a rod body, there is no need for centering for that portion, manufacturing can be facilitated, and the number of parts can be reduced.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a side sectional view, FIG. 2 is a side sectional view showing an operating state, FIG. 3 is a front view, and FIG. 4 is a conventional example. It is a side sectional view shown. 1 ... Air nipper, 2 ... Tool body, 6 ... First cylinder chamber, 8 ... Cutter advancing / retreating air supply passage, 9 ... First air flow passage, 14 ... Cutter advancing / retreating piston, 18 ... 2 cylinder chambers, 25 ... voids, 31 ... second air flow passage, 32 ...
Cutter opening / closing air supply path, 34 …… Cutter (clamping tool), 38
...... Cutter opening / closing piston.

Claims (1)

[Scope of utility model registration request] A piston for advancing / retreating a pressing tool provided with a pressing tool which pivotally supports an intermediate part of a pair of pressing bars in an openable and closable manner in a first cylinder chamber formed in a tool body. A piston for opening and closing the clamping device is provided slidably in a second cylinder chamber formed in the piston, and an air supply passage for advancing and retracting the clamping device from the outside to the piston rear surface of the first cylinder chamber is formed in the tool body. At the same time, in the pneumatic tool having an air supply path for opening and closing the pinching tool from the outside to the piston rear surface of the second cylinder chamber,
The air supply passage for opening and closing the clamp is formed in the tool main body by reaching the gap for air circulation formed between the inner surface of the first cylinder and the outer peripheral surface of the piston for advancing and retracting the clamp, and reaching the gap from the outside. A pneumatic tool comprising a first air flow passage and a second air flow passage formed in a piston for advancing / retracting a pressure member from a void portion to a second cylinder chamber.