JP2006334746A - Gripping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small gripping device, excellent in durability and in positioning precision and capable of gripping several kinds of lengthy columnar works. <P>SOLUTION: A cylindrical body 1 opened below, a cylindrical slider 2 on an inner peripheral surface of which a taper surface is formed and a plurality of claw members 5 having reverse taper parts to be engaged with the taper surface of the slider are arranged in a concentric circular shape, springs 6, 7 applying a load in a direction where the plurality of claw members are arranged in a separated manner from each other and a plurality of independent claw members grip the lengthy columnar work 9 in a hollow part in the inside of the body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gripping device suitable for gripping a long cylindrical workpiece.

  Various methods are known as a method of gripping a long cylindrical workpiece.

    As disclosed in JP-A-8-229868, an elastic body such as a rubber sheet is fixed to the inner periphery of a cylindrical flange, and the elastic body is deformed by feeding compressed air into a pressure chamber formed by the flange and the rubber sheet. There is a method of gripping a workpiece.

  However, since this method deforms and grips the elastic body, the positioning accuracy is poor, the balance of the amount of elastic deformation is out of order, and the workpiece may be displaced or tilted.

In addition, there is a problem in durability, such as tearing due to deformation or deterioration of rubber.
JP-A-8-229868

  As another conventional example, a method using a collet as in JP-A-3-190611 is used.

  The collet is a method in which a tapered surface is formed on a cylindrical material with a slit, and an inner surface is formed in accordance with a workpiece shape, and is elastically deformed and gripped.

According to this method, it is possible to grip with high positioning accuracy. However, since a collet mainly composed of metal parts is gripped by being elastically deformed, only specific workpiece dimensions can be gripped.

Therefore, in order to grip a workpiece having a different workpiece size, a collet that matches the workpiece size must be newly prepared.
Japanese Patent Laid-Open No. 3-190611

As another method, there is a method of gripping using a chuck device such as an air chuck using fluid pressure or a motor hand driven by electricity.

These chucks are devices that convert fluid pressure and thrust of a motor, etc., and open and close a plurality of slide members synchronously. A claw member formed according to the shape of the work is fixed to the slide member, A method of gripping a work is generally taken.

However, since the claw member is fixed and gripped on the slide member, the workpiece and the claw member are clamped at a position away from the chuck. Therefore, if the clearance of the guide of the slide portion increases due to wear or the like, the claw member When the workpiece is clamped, it tilts and the workpiece positioning accuracy deteriorates.

Further, the size of the chuck is large, and when the claw member is attached in the longitudinal direction, the length becomes long and the weight also becomes heavy.

  An object of the present invention is to provide a gripping device that is small in size, has good durability and positioning accuracy, and can grip several types of long cylindrical workpieces.

As a means for solving the above-described problems, the present invention provides a cylindrical body having an open bottom, a cylindrical slider having a tapered surface formed on an inner peripheral surface, and a reverse tapered surface engaged with the tapered surface of the slider. A plurality of claw members having concentric circles are arranged, and a spring is applied in a direction in which the plurality of claw members are separated from each other. To grip.

In addition, a cylindrical body with a lower opening, a cylindrical slider having a tapered surface formed on the inner peripheral surface, and a plurality of claw members having reverse tapered surfaces that engage with the taper surface of the slider are arranged concentrically. In addition, a spring that places a load in the direction in which the plurality of claw members are separated from each other is disposed, and an operation plate disposed above the body and a slider that slides up and down on the inner peripheral surface of the body are disposed on the upper surface of the body. They are connected by a penetrating shaft, and are gripped by a spring that is compressed and inserted in a direction away from the body and the operation plate.

Further, a cylindrical body having an open bottom, a cylindrical slider having a tapered surface on the inner peripheral surface, and a plurality of claw members having reverse tapered surfaces that engage with the taper surface of the slider are arranged concentrically. In addition, a spring that places a load in the direction in which the plurality of claw members are separated from each other, a cylinder disposed above the body, and a slider that slides up and down on the inner peripheral surface of the body are connected to the piston, It is gripped by air pressure.

  With the above configuration, the independent claw members grip the long cylindrical workpiece with the hollow portion inside the body, so the overall length is not increased and the outer shape is also formed as a thin cylindrical part. Small and compact.

  In addition, each part is made of a metal part, and since the inclination of the claw member due to wear does not occur, positioning accuracy is good and durability is good.

Since the claw member can be arranged long inside the hollow portion, the contact surface with the long cylindrical workpiece becomes long, which is suitable for gripping the long cylindrical workpiece.

  Furthermore, since the plurality of claw members are radially arranged by fitting to the taper surface of the slider, a plurality of long cylindrical workpieces having a large movement amount compared to the collet and different workpiece dimensions are gripped by the same gripping device. be able to.

In the method of claim 2, since the gripping is performed by the elastic force of the spring, it is possible to prevent the workpiece from dropping due to air breakage in the middle of conveyance, and it is only necessary to use the driving source only when the workpiece is released.

In addition, since the drive source can be set either externally or integrally, it is possible to cope with various device configurations according to the device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the gripping device of this embodiment includes a cylindrical body 1 that is open at the bottom, a cylindrical slider 2 having a tapered surface 8 formed on the inner peripheral surface, and a tapered surface 8 of the slider 2. A plurality of claw members 5 having reverse taper surfaces that engage with each other are arranged concentrically, and an operation plate 4 disposed above the body 1 and a slider 2 that slides up and down by sliding with the inner peripheral surface of the body 1 are provided. They are connected by a shaft 3 penetrating the upper surface of the body 1.

Between the body 1 and the operation plate 4, a spring A <b> 6 that applies a load in a separating direction is disposed, and a spring B <b> 7 that applies a load in a direction in which the claw members 5 are separated from each other.

Next, the operation will be described.

Since the spring A6 is disposed between the body 1 and the operation plate 4, the slider 2 connected to the operation plate 4 by the shaft 3 exerts a force to move upward.

Therefore, the three claw members 5 fitted to the tapered surface 8 formed on the inner peripheral surface of the slider 2 are moved in the center direction while compressing the spring B7.

Next, as shown in FIG. 4, when an external load is applied to the operation plate by the pusher 14 or the like, the slider 2 connected to the operation plate 4 by the shaft 3 moves downward, so that the taper surface 8 of the slider 2 At the same time, the claw member 5 moves in the opening direction by the force of the spring B7.

When the workpiece 9 is inserted into the hollow portion of the gripping device in this state and the pusher 14 is raised, the operation plate 4 is raised by the force of the spring A 6, and the claw member 5 fitted to the taper surface 8 of the slider 2 is attached to the workpiece 9. Move in the direction and grip.

At this time, the workpiece 9 is gripped as shown in FIG. 6, but by holding the workpiece 9 before the closed state shown in FIG. can do.

As another embodiment, as shown in FIG. 7, a cylindrical body 1 whose lower side is opened, a cylindrical slider 2 having a tapered surface 8 formed on the inner peripheral surface, and a tapered surface 8 of the slider 2 are engaged. A plurality of pawl members 5 having reverse taper surfaces are arranged concentrically, and a cylinder 154 disposed above the body 1 and a slider 2 that slides up and down on the inner peripheral surface of the body 1 are provided on the body 1. It connects with the piston 16 which penetrates an upper surface.

The cylinder 15 and the piston 16 form a pressure chamber, and the slider 16 is moved up and down by operating the piston 16 up and down by air pressure.

About operation | movement, since it changed into the cylinder 15 and the piston 16 instead of the operation plate 4, the shaft 3, and the spring A6, it abbreviate | omits.

Note that the cylinder may be a single acting type in addition to the backward acting type.

As for the shape of the tapered surface, any shape that satisfies the gist such as a conical shape as well as a conical shape is effective.

The gripping device is a gripping device suitable for gripping a long cylindrical workpiece, but it is also effective to use it as a fixing device for a jig or the like in addition to transporting.

Sectional drawing which shows the closed state of a present Example AA sectional view of FIG. Top view showing the closed state of this embodiment Sectional drawing which shows the open state of a present Example BB sectional view of FIG. Sectional drawing which shows the holding | grip state of a present Example Sectional drawing which shows the holding state of 2nd Example Sectional view showing a conventional example Explanatory drawing showing another conventional example

Explanation of symbols

1 Body 2 Slider 3 Shaft 4 Operation Plate 5 Claw Member 6 Spring A
7 Spring B
8 Tapered surface 9 Work 10 Flange 11 Rubber sheet 12 Chuck 13 Slide 14 Pusher 15 Cylinder 16 Piston

Claims (3)

The present invention relates to a cylindrical body having an open bottom, a cylindrical slider having a tapered surface on the inner peripheral surface, and a plurality of claw members having reverse tapered surfaces that engage with the tapered surface of the slider. And a plurality of independent claw members for gripping a long cylindrical workpiece in a hollow portion inside the body. . A cylindrical body having an open bottom, a cylindrical slider having a tapered surface on the inner peripheral surface, and a plurality of claw members having reverse tapered surfaces that engage with the tapered surface of the slider are arranged concentrically. A spring that places a load in the direction in which the plurality of claw members are separated from each other, an operation plate disposed above the body, and a slider that slides up and down on the inner peripheral surface of the body penetrate the upper surface of the body A gripping device connected by a shaft and gripped by a spring that is compressed and inserted in a direction separating the body and the operation plate. A cylindrical body having an open bottom, a cylindrical slider having a tapered surface on the inner peripheral surface, and a plurality of claw members having reverse tapered surfaces that engage with the tapered surface of the slider are arranged concentrically. A spring that places a load in the direction in which a plurality of claw members are separated from each other, a cylinder arranged above the body, and a slider that slides up and down on the inner peripheral surface of the body are connected to the piston, and the air pressure A gripping device characterized by gripping by means of.

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