JPH06139842A - Electric wire clamp and its manufacture - Google Patents

Abstract

PURPOSE:To surely grip an electric wire without damaging it by forming fine projection faces having many fine irregularities on the electric wire grip sections of a pair of clamp claws constituting an electric wire clamp. CONSTITUTION:An electric wire clamp A is constituted of a pair of clamp claws 2, 2' rotatably provided around the support shafts 1a, 1a' of a base 1 and a spring 3 elastically pinching the clamp claws 2, 2' together. Comb teeth- like electric wire grip sections 4, 4' are provided at the tip sections of the clamp claws 2, 2' respectively. The shot blast machining by spraying fine grains such as steel grains by air pressure is applied to the electric wire grip sections 4, 4' in advance, and fine projection faces 4a, 4a' having many fine irregularities are formed. The surface area for gripping an electric wire can be increased, and the surface of the gripped electric wire can be uniformly pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire clamp used for gripping an electric wire in an electric wire processing machine or an electric wire conveying device, and a method for manufacturing the electric wire clamp.

[0002]

2. Description of the Related Art Conventional electric wire clamps use a clamp member provided with a step at the electric wire gripping portion to ensure gripping of the electric wire. For example, as shown in FIGS. In order to strengthen the gripping force, the trapezoidal clamping projection b is provided on one of the pair of clamp members a and a ′ that can be opened and closed, and the clamping recess c is provided on the other, and the electric wire is clamped on the clamping projection. There has also been proposed a device which is sandwiched and held between b and a sandwiching recess c and projecting concentrators d and d '(Japanese Utility Model Laid-Open No. 61-77513).

When the electric wire is clamped by such an electric wire clamp, the electric wire e is, as shown in FIG.
It may be pinched between a'and refracted damaged parts f may be generated, which may cause problems such as deterioration of mechanical strength and insulation failure.

Also, as shown in FIG. 11, a clamp member g having a tap eye h stamped thereon to improve the gripping force of an electric wire may be used. In this case as well, a spring provided in the clamp member is used. Due to the contracting force, a shocking force is applied when the electric wire is clamped, so that the electric wire e as shown in FIG.
There are problems such as damage due to the tap eye h and a damaged portion f ′ such as a crack of the insulating coating around the periphery of the.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an electric wire clamp capable of reliably gripping an electric wire without damaging the electric wire to be gripped, and a manufacturing method thereof. This is an issue.

[0006]

In order to achieve the above-mentioned object, the invention of claim 1 is an electric wire clamp comprising a pair of clamp claws that can be opened and closed. It is characterized in that it is formed by forming a fine projection surface having irregularities.

A second aspect of the present invention is an electric wire clamp having a pair of clamp claws that can be opened and closed, and is provided with a cushioning means for alleviating an impact applied to the electric wire gripped by the clamp claws. To do.

According to a third aspect of the present invention, there is provided a chain type electric wire clamp in which a carrying chain is provided with a pair of grippers provided with a pair of openable and closable clamp claws connected in a chain, and the electric wire gripped by the clamp claws. It is characterized in that it is provided with a buffering means for alleviating the impact applied to the.

According to a fourth aspect of the present invention, the electric wire gripping portion of the clamp claw forming the electric wire clamp is subjected to shot blasting by blowing fine particles such as steel particles with air pressure to thereby obtain the electric wire gripping portion. It is characterized in that a fine protrusion surface having a large number of fine irregularities is formed on the surface.

[0010]

In the electric wire clamp according to the first aspect of the present invention, since the clamp claws are formed with a large number of fine protrusions having fine irregularities,
Since the contact area with the electric wire is increased and the pressing force for gripping the electric wire is evenly distributed, the electric wire can be securely gripped without damaging the electric wire.

In the electric wire clamps according to the second and third aspects, since the shock absorbing means absorbs the shocking stress applied to the clamp claws immediately before the clamp claws are completely closed, the shock at the time of gripping the electric wire is prevented. It is relieved, and it is possible to perform a reliable grip without damaging the electric wire.

In the method for manufacturing the electric wire clamp according to the fourth aspect, the electric wire gripping portion of the clamp claw constituting the electric wire clamp is subjected to shot blasting so that fine particles such as steel particles are generated in the electric wire gripping portion. It is blown with air pressure, and its collision forms a large number of fine protrusions having fine irregularities.

[0013]

1 is a perspective view of an electric wire clamp A showing an embodiment of the present invention. The electric wire clamp A includes a pair of clamp claws 2 and 2'rotatably provided around the support shafts 1a and 1a 'of the support 1, and a spring 3 that elastically clamps the clamp claws 2 and 2'. It consists of

Comb-shaped electric wire gripping portions 4 and 4'are provided at the tips of the clamp claws 2 and 2 ', respectively, and the electric wire gripping portion 4 has a fine projection surface 4a on which fine irregularities are formed by shot blasting. It is provided. Although not shown, the wire gripping portion 4'is also formed with a fine projection surface having fine unevenness by the similar shot blasting.

Shot blasting is a processing method in which steel particles and the like are blown onto the surface to be machined by air pressure, and is generally used for sand cleaning of castings, deburring of forged products, scale removal of heat-treated parts, etc. Although used, in the present invention, this means is used to form fine irregularities on the wire gripping surface 4a of the wire gripping portion 4.

As the conditions for the shot blasting in this embodiment, coarse particles # 16 of alumina abrasive were used,
It was performed by blowing compressed air having a pressure of 6 kg / cm. The fine protrusion surface 4a is formed by subjecting the wire gripping portion 4 to shot blasting, and since fine irregularities such as a paper file are entirely formed on the surface, a surface area for gripping the wire is substantially formed. Is increased. Therefore, the surface of the electric wire to be gripped can be pressed uniformly, and the electric wire can be reliably gripped without damage.

FIG. 2 is an explanatory view of an electric wire clamp B showing an embodiment of the invention of claim 2. The electric wire clamp B is provided with a pair of clamp claws 6 and 6'openably and closably on the support body 5, and is also provided with an air cylinder 7 as a cushioning device for restricting the operation of the clamp claws 6 and 6 '. Clamp claw 6, 6 '
To clamp the wire elastically, the clamp claw 6,
A spring 8 for connecting 6'to each other is mounted.

The air cylinder 7 houses therein a piston 9 which slides vertically, and is compressed through air tubes 10 and 10 'connected to air inlets 7a and 7a' provided at both ends of the air cylinder 7. The compressed air supplied from the air source 11 controls the vertical movement of the piston 9.

A regulator 12 and an operating valve 13 are provided between the compressed air source 11 and the air cylinder 7 to change the air pressure to adjust the impact force to be absorbed. Reference numeral 14 is a pressure gauge.

A rod 15 is connected to the piston 8, and when the piston 8 is at the lowest position in the air cylinder 7, the tip portion 15a of the rod 15 has a buffer projection immediately before the clamp claws 6 and 6'are closed. It is set at a position where it abuts against 6a and pushes up the rod 15.

When an electric wire is gripped using the electric wire clamp B, the electric wire clamp B is closed by a mechanical means such as a cam (not shown) from a state where the clamp pawls 6 and 6'are opened. When gripping, the clamp claws 6, 6'are held by the spring 8 immediately before the clamp claws 6, 6'are closed.
A shocking force applied to the rod 15 of the air cylinder 7 is applied to the rod 15 of the air cylinder 7 via the buffer protrusion 6a, and the rod 15 is gradually lifted by the buffer action of the compressed air in the air cylinder 7. Slowly closing, no impact force is applied to the grasped electric wire, and the electric wire can be prevented from being damaged.

FIG. 3 is a perspective view showing an essential part of a chain type electric wire clamp C for conveying electric wires according to an embodiment of the invention of claim 3. The chain-type electric wire clamp C is an electric wire clamp for conveying electric wires, and is attached to the frame 16 of the coated electric wire peeling device.

The electric wire clamp C is a carrier chain 1 fitted to a sprocket 18 rotated by a driving means 17.
9, a plurality of grippers 20 are attached at predetermined intervals. Each gripping tool 20 is provided with a pair of clamp claws 21 and 21 'which can be opened and closed. The clamp claws 21 and 21 'are connected from the electric wire supply nozzle 22 to the cutter 2
The electric wire 25, which is supported by the electric wire support clamp 24 through the wire 3, is clamped.

As shown in FIG. 4, the clamp claws 21 and 21 'support the support shafts 20a and 20 with respect to the gripping tool 20, respectively.
The clamps 21 and 21 'are rotatably mounted around a'and are connected to each other by a spring 26. The clamp claws 21 and 21' are closed by an external operation so that the electric wire 25 is sandwiched therebetween. Further, due to the action of the spring 26, as shown in FIG.
It is also possible to keep 1, 21 'open.

On the other hand, the frame 16 is provided with an air cylinder 27 near the electric wire 25 to be gripped as a shock absorbing device for absorbing the impact of the clamp claws 21 and 21 '.
Similar to the air cylinder 7 of the electric wire clamp B, the air cylinder 27 has air introduction ports 27a, 2a provided at both ends.
A rod 29 driven by compressed air supplied through air tubes 28, 28 'connected to 7a' is provided, and a tip end 29a of the rod 29 abuts on a buffer protrusion 21a provided on one clamp claw 21. It is installed in the position. Although not shown, the air tubes 28 and 28 'are connected to a compressed air source through a regulator and an operation valve similar to those in the above-described embodiment, and the air cylinder 27 is used.
The inside air pressure can be adjusted freely.

Next, the action of the air cylinder 27 on the clamp claws 21 and 21 'of the chain type electric wire clamp C will be described. Rotate the sprocket 18 and
As shown in FIG.
1, 21 'are positioned in the open state, and the cams (not shown) actuate the clamp claws 20, 20' in the directions of arrows T, T ', that is, in the closing direction.

At this time, the clamp claws 21 and 21 'tend to close abruptly due to the strong contracting force of the spring 26, but as shown in FIG. 7, the buffer protrusion 21a provided on the clamp claw 21 and the air cylinder 27 are closed. Tip 29 of rod 29
a, and the cushioning action of the air cylinder 27 causes the clamp claws 21 and 21 'to follow the gentle rise of the rod 29.
Is slowly closed, so that the electric wire 25 can be securely gripped without giving an impact. Then, the same operation is repeatedly performed on the gripping tool 20 sequentially sent by the rotating sprocket 18, and the clamp 19 and 21 ′ of each gripping tool 20 grips the electric wire 25 and the chain 19 makes a predetermined operation. It is about to be transported to the position.

[0028]

According to the wire clamp of the first aspect of the present invention, since the wire gripping surface having a large number of fine irregularities is formed on the clamp claw, the wire can be securely gripped without damaging the wire. Helps improve reliability and reliability.

In the electric wire clamps according to the second and third aspects, since the buffer device acts on the clamp claws, it is possible to relax the shocking force when the electric wire is clamped and hold the electric wire. Therefore, the electric wire can be surely gripped without damaging the electric wire, and productivity and reliability are significantly improved.

According to the method of manufacturing the electric wire clamp described in claim 4, since a large number of fine protrusion surfaces having fine irregularities are formed on the electric wire gripping portion of the clamp claw by shot blasting, a large number of them are formed. The productivity of the step of forming the electric wire gripping surface having fine irregularities is improved, and the electric wire clamp according to claim 1 can be efficiently produced.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric wire clamp showing an embodiment of the present invention.

FIG. 2 is an explanatory view of an electric wire clamp showing another embodiment of the present invention.

FIG. 3 is a perspective view showing a main part of a chain-type electric wire clamp for electric wire conveyance according to another embodiment of the present invention.

FIG. 4 is a side view showing a state in which the clamp claws of the gripping tool of FIG. 3 are closed.

5 is a side view showing a state in which the clamp claws of the gripping tool in FIG. 4 are opened.

FIG. 6 is an explanatory view showing the action of the gripping tool and the air cylinder of FIG.

7 is an explanation without showing a state immediately before the clamp claw of FIG. 6 is completely closed. FIG.

FIG. 8 is a perspective view of a conventional wire clamp.

9 is a cross-sectional view of the clamp claw of FIG.

FIG. 10 is an explanatory diagram showing damage to the electric wire held by the clamp claws of FIG. 9;

FIG. 11 is a perspective view of a clamp claw of another conventional electric wire clamp.

FIG. 12 is an explanatory diagram showing damage to an electric wire held by the clamp claws of FIG. 11.

[Explanation of symbols]

 A, B, C Electric wire clamp 2, 2'Clamping claw 4, 4 'Electric wire gripping part 4a Fine protrusion surface 6, 6'Clamping claw 7 Air cylinder 19 Transport chain 20 Grasping tool 21, 21' Clamping claw 27 Air cylinder

Claims (4)

[Claims] 1. An electric wire clamp comprising a pair of openable and closable clamp claws, wherein the electric wire gripping portion of the clamp claws is formed with a large number of fine projection surfaces having fine irregularities. . 2. An electric wire clamp having a pair of openable and closable clamp claws, which is also provided with a cushioning means for absorbing a shock applied to an electric wire gripped by the clamp claws. 3. A chain-type electric wire clamp formed by connecting a holding tool having a pair of openable / closable clamp claws in a chain shape to a transport chain, and mitigating an impact applied to an electric wire gripped by the clamp claws. A chain-type electric wire clamp, which is characterized in that it is also provided with a cushioning means. 4. The electric wire gripping portion of the clamp claw forming the electric wire clamp is subjected to shot blasting by blowing fine particles such as steel particles by air pressure to obtain a large number of fine electric wire gripping portions. A method for manufacturing an electric wire clamp, comprising forming a fine protrusion surface having irregularities.