JP2003225825A - Welding wire cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding wire cutting device capable of cutting a welding wire by an easily movable small machine. <P>SOLUTION: The welding wire cutting device is provided with a guide mechanism guiding a torch of a welding unit or the welding wire protruding from the torch, a base body joined with the first guide mechanism, and a pendulum cutting tool turnably supported by the base body. The pendulum cutting tool cuts the welding wire by a turning mechanism converting the energizing force of a spring into a force for turning the cutting tool. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire cutting device used for welding.

[0002]

2. Description of the Related Art When performing a welding operation using a welding wire, the tip of the wire becomes spherical during the process in which a part of the molten wire is solidified by the surface tension of the material immediately after welding.
When this spherical solidified substance adheres to the tip of the wire during the next welding operation, the arc generation becomes unstable during welding and high quality welding cannot be performed. Conventionally, cutting work was performed manually by using a nipper or the like so as to remove the solidified matter at the tip of the welding wire.

Further, in a production line or the like, when an object to be welded is carried into a place where a welding environment is maintained for welding, or when welding work is performed in the production line, an air source and a power source are required in the line. A large-scale welding wire cutting device is installed. For this reason, for example, when welding work must be performed outdoors, the power supply device and the air source device, which are auxiliary devices, must be carried in advance to the vicinity of the work place to perform the work.

[0004]

In the work of cutting the welding wire, the cutting shape has a great influence on the quality during welding. When manually cutting the welding wire using a nipper or the like, the worker uses protective glasses to work with both hands so that the cut welding wire does not scatter. For this reason, it is necessary to temporarily stop the welding operation and cut the tip portion of the welding wire. Therefore, extra time is required for cutting the wire. In addition, when using a welding wire cutting device for welding work in a production line or outdoors, it is unnecessary to prepare the operation of the welding wire cutting device before the welding work because the device that requires an air source and a power source is used. It took time.

Therefore, the present invention is to provide a welding wire cutting device capable of extremely shortening the interruption time of the welding operation by a small mechanical device which can be easily moved so as not to cause the above-mentioned problems. It is an issue.

[0006]

In order to solve the above-mentioned technical problem, the invention of claim 1 is a wire cutting device equipped with a cutting tool for cutting a welding wire. The pendulum includes a guide mechanism for guiding the welding wire protruding from the torch portion, a base portion joined to the first guide mechanism, and a pendulum type cutting tool rotatably supported by the base portion. The type cutting tool is a welding wire cutting device that cuts the welding wire by a rotating mechanism that converts the biasing force of a spring into a force for rotating the cutting tool.

Since the welding wire can be cut by the rotating mechanism for converting the biasing force of the spring into the force for rotating the blade as described above, a power source or an air source for driving the blade is not required, Therefore, the welding wire cutting device can be used regardless of the welding place.

More specifically, as described in claim 2, the base portion has a shaft slidably supported, and the pendulum type cutting tool is rotated after the base portion has moved a predetermined distance. The main body of the wire cutting device has a second guide mechanism for slidably supporting the base body, and the protrusion after the base body has moved a predetermined distance. The welding wire cutting device has a contact portion that comes into contact with the welding wire.

After the base body has moved by a predetermined distance, the contact portion of the main body is brought into contact with the protrusion of the pendulum type blade tool supported by the base body to perform a rotary motion. The structure of rotating the cutting tool used in the welding wire cutting device can downsize the device itself.

As described in claim 3, when the pendulum type cutting tool is rotated by a predetermined angle or more, the biasing means applies a biasing force to return the pendulum type cutting tool to the position before the rotation. And a welding wire cutting device.

The urging means is a welding wire cutting device having a spring. By using the spring as the urging means, the shearing force at the time of cutting the welding wire can be controlled with a predetermined force, so that the cutting quality at the time of cutting the welding wire can be stably maintained.

Further, the invention of claim 4 which has been devised to solve the above technical problem, comprises a base body portion having an internal space, a welding wire projecting into the internal space of the base body portion, and the welding wire being directed in a predetermined direction. A first guide mechanism for movably guiding the blade, a cutting tool housed in the internal space of the base body movably up to a protruding portion of the welding wire into the internal space of the base body, and the cutting tool of the welding wire. An elastic member that urges in the direction toward the protruding portion, a restricting member that restricts the blade tool from moving to the protruding portion of the welding wire, and a release unit that releases the restriction of movement of the blade tool by the restricting member. And a welding wire cutting device.

According to the fourth aspect of the invention, when the restriction of the movement of the cutting tool by the restriction member is canceled by the canceling means, the cutting tool is moved to the projecting portion of the welding wire inside the base portion by the urging force of the elastic member, and the cutting tool is moved. The welding wire is cut by.

Since the cutting of the welding wire is performed based on the biasing force of the elastic member in this manner, there is no need for a power source or an air source for driving the cutting tool. Therefore, the welding wire cutting can be performed at any welding location. The device is ready for use. Also,
Since the cutting of the welding wire is performed in the internal space of the base, it is possible to prevent the cutting pieces from splashing to the outside, and the operator does not need to attach protective equipment only for cutting the welding wire, which interrupts the welding work. The time can be shortened.

The invention according to claim 5 is the invention according to claim 4, wherein the regulating member is a protrusion formed on the inner wall of the base portion, and the cutting tool includes an engaging portion that engages with the protrusion. It is characterized in that the cutting tool is restricted from moving to the protruding position of the welding wire by the engagement of the protrusion and the engaging portion.

According to the fifth aspect of the invention, the blade can be moved to the protruding position of the welding wire by the engagement of the projection formed on the inner wall of the base and the engaging portion provided on the blade. Regulated.

Further, in the invention of claim 6 according to claim 5, the releasing means is relatively moved from a state where the projecting portion and the engaging portion are engaged to a state where they are not engaged. It is characterized in that the movement restriction of the cutting tool is released by being enabled.

As a releasing means for releasing the engagement between the protruding portion and the engaging portion, a member for changing the protruding amount of the protruding portion is provided, and the engagement is released by changing the protruding amount of the protruding portion. A method of adding a configuration that functions as a releasing means is conceivable. However, as in the invention of claim 6, the protrusion and the engaging portion are relatively movable from the engaged state to the disengaged state. It is preferable that the two are arranged so that the movement restriction of the cutting tool is released without adding any configuration. By doing this, there is no need to add a structure for canceling the movement restriction,
The manufacturing cost of the welding wire cutting device can be reduced.

The invention of claim 7 is the blade tool according to any one of claims 5 and 6, wherein the cutting tool for cutting the welding wire has a cutting piece attached to a tip thereof.
The blade includes: an engaging piece having the engaging portion formed at its tip; an elastic member attaching piece to which one end of the elastic member is attached; and a rotating shaft. And the engaging piece and the elastic member attaching piece are rotatable.

According to the invention of claim 7, when the engaging portion of the engaging piece is disengaged from the protrusion of the base body, the elastic member attaching piece to which one end of the elastic member is attached is attached to the elastic member. It is rotated about the rotation axis by the force. With this,
The blade piece with the cutting blade attached to the tip also rotates about the rotation axis. Then, the protruding portion of the welding wire located in the rotation trajectory of the cutting blade is cut by the rotation of the cutting blade, and the cutting of the welding wire is completed.

Further, the invention of claim 8 is characterized in that, in claim 7, the rotating shaft moves in the predetermined direction as the welding wire moves in the predetermined direction.

According to the eighth aspect of the present invention, the rotating shaft moves in the predetermined direction as the welding wire moves in the predetermined direction. With such movement of the rotating shaft, the engaging portion formed at the tip of the engaging piece having the rotating shaft as the fulcrum of rotation also moves.
The movement of the engaging portion acts as the releasing means, the relative position between the protrusion formed on the inner wall of the base portion and the engaging portion is changed, and both of the engaging state and the non-engaging state (the engaging state is It is in the released state).

The invention of claim 9 is characterized in that, in claim 8, the welding wire moves in the predetermined direction together with the first guide mechanism.

According to a tenth aspect of the present invention, in the ninth aspect, there is provided a moving member that moves integrally with the first guide mechanism, and the rotating shaft is attached to the moving member. It has a feature.

According to the tenth aspect of the invention, the rotating shaft is attached to the moving member that moves integrally with the first guide mechanism. Moreover, the first guide mechanism moves in the predetermined direction together with the welding wire. Therefore, the rotating shaft moves in the moving direction of the welding wire.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the welding wire cutting device of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view showing the outer shape of the welding wire cutting device of the present invention.
A torch guide 4 is formed in the upper part of the welding wire cutting device so that the welding torch is inserted therein. The torch guide 4 is processed into a shape in which the outer diameter of the torch is smoothly guided. Also, at the bottom of the welding wire cutting device,
A wire receiver is formed to receive the cut welding wire. When the welding wire cutting device is attached with a slight inclination as shown in FIG. 1, the manual work becomes easier.

Next, the construction and operation of the welding wire cutting device of the present invention will be described with reference to FIGS. 2 to 6.
FIG. 2 is a schematic sectional view showing the internal structure of the welding wire cutting device. The welding wire cutting device is a welding torch (not shown)
And a torch guide 4 for guiding the welding wire protruding from the tip of the welding torch, an upper cylinder 3 for guiding the outer circumference of the torch guide 4 when the torch guide 4 is pushed downward, and a pendulum type for the lower portion of the torch guide 4. A block 5 in which a blade (blade) 2 is rotatably supported by a pin 15, a spring 16, a guide shaft 6, a guide 7, and a pressing spring 9,
It is composed of a lower block 18 (base portion) which accommodates these in an internal space.

The torch guide 4 is a cylindrical member having a recessed space for fixing the torch in the center.
In the center of the recessed space, a hole that opens to the bottom of FIG. 2 is formed. Then, the torch is housed in the recessed space, and the tip of the welding wire protruding from the torch projects from the hole into the internal space of the lower block 18.

The block 5 is provided in contact with the lower portion of the torch guide 4 in FIG. 2, and is formed by a set of two flat plates. These two plates are symmetrically arranged with respect to the holes formed in the lower portion of the torch guide 4. Therefore, the lower block 1 from the hole
The welding wire protruding into the internal space of 8 is the block of 5 pieces.
It will be sandwiched between.

As shown in FIG. 2, the pendulum type cutting tool 2 has three pieces, namely, a blade piece 2a, an engaging piece 2b, and an elastic member mounting piece 2c. Further, a recess is formed near the center thereof, and the pin 15 (rotating shaft) is inserted into the recess. The three pieces are formed to extend in different radial directions as a base end near the pin 15. The blade piece 2a is
A cutting blade 13 is formed at its tip. This cutting blade 1
3 is for actually contacting the welding wire and cutting the welding wire. The engaging piece 2b has an engaging portion 8 formed at its tip. One end of a spring (elastic member) 16 is attached to the tip end side of the elastic member attachment piece 2c.

A trigger 17 (protrusion) is provided on the inner wall of the lower block 18. This trigger 1
Although the pin 7 is rotatable by a pin or the like, it cannot move in the clockwise direction from the horizontal state shown in FIG. 2 due to the contact with the inner wall of the lower block 18. On the other hand, it can move in the counterclockwise direction from the horizontal state shown in FIG.

To cut the welding wire, a welding wire (not shown) protruding from the central tip of the welding torch is inserted into a hole below the central axis of the torch guide 4 and pressed downward. At this time, the receiving block 5 comes into contact with the lower portion of the torch guide 4 and simultaneously descends downward together with the torch guide 4. The torch guide 4 is guided by the inner circumference of the upper cylinder 3, and the guide shaft 6 below the receiving block 5 is guided.
Is guided by the guide 7 and descends. Further, when the torch guide 4 and the receiving block 5 move downward, the engaging portion 8 of the pendulum type cutting tool 2 held by the receiving block 5 with the pin 15 has a protrusion-shaped trigger 17 () attached to the inner wall of the lower block 18. (Projection). At this time, the spring 16 loses the force of pressing the torch guide 4 and extends (FIG. 3). Further, when the torch guide 4 and the receiving block 5 move downward, the engaging portion 8 and the trigger 17
The pendulum type cutting tool 2 held by the receiving block 5 starts to rotate about the pin 15 in the clockwise direction shown in FIG. At this time, the spring 16 is further extended as compared with the state of FIG. 3 (FIG. 4). Due to the expansion of the spring 16, the pendulum type cutting tool 2 receives a biasing force in a counterclockwise direction in FIG. 4, that is, in a direction in which the blade piece 2a approaches the protruding portion of the welding wire protruding from the lower block 18, but the engaging portion The movement in the above direction is regulated by the engagement of 8 and the trigger 17.

When the torch guide 4 and the receiving block 5 are further moved downward, the distance from the tip of the trigger 17 to the pin 15 changes from the pin 15 holding the pendulum type cutting tool to the engaging part 8.
When the distance becomes equal to or greater than the tip, the trigger 17 and the engaging portion 8 cannot contact each other, and the engagement between the engaging portion 8 and the trigger 17 is released. There is nothing that regulates the urging force of the spring 16 due to this disengagement, and the pendulum type cutting tool 2 tries to return to the state before the torch guide 4 is pressed by the welding torch by the urging force. Rotate to. At this time, the natural length of the spring 16 is set shorter than the position where the tip of the cutting tool 13 is located in the lower hole of the torch guide 4, so that the pendulum cutting tool 2 has an anti-reverse function as shown in FIG. It rotates clockwise, but tilts slightly when it is a little too far from the 12:00 direction. When the pendulum type cutting tool 2 rotates counterclockwise as described above, the welding wire protruding from the welding torch inserted in the torch guide 4 hits the cutting blade 13 at the tip of the pendulum type cutting tool 2 and is cut. afterwards,
When the welding torch is pulled out from the torch guide 4, the torch guide 4 and the receiving block 5 are lifted by the biasing force of the push spring 9 arranged at the lower part of the receiving block 5, and return to their original positions.

When the welding torch is pulled out from the state shown in FIG. 5, the torch guide 4 also moves upward. Along with this, the pendulum type cutting tool 2 also rotates in the clockwise direction and tries to return to the original position. At this time, the engaging portion 8 of the engaging piece 2b collides with the trigger 17 from below, but the trigger 1
Since 7 is movable in the counterclockwise direction, the engaging portion 8 flips up the trigger 17 as shown in FIG. Then, the pendulum type cutting tool 2 returns to the original position, and the flip-up of the trigger 17 is stopped by gravity, and the state returns to the state of FIG.

[0035]

As described above, in the present invention, the welding wire protruding from the welding torch can be easily cut by simply pushing the tip of the welding wire into the upper portion of the welding wire cutting device without using air or a power source. it can. At this time, since the length of the welding wire protruding from the welding torch is automatically cut to the optimum length for welding, the welding work can be started immediately after cutting the welding wire. In welding work,
Since the welding wire cutting work for removing the solidified matter generated at the welding wire tip portion, which is frequently performed to secure the welding quality, only inserts the welding wire tip portion into the welding wire cutting device of the present invention, the welding torch is therefore used. Since you can work from anywhere without taking your hands off and from in a short time,
Has a great effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a welding wire cutting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the welding wire cutting device in the embodiment of the present invention, showing a state before cutting the welding wire.

FIG. 3 is a cross-sectional view of the welding wire cutting device according to the embodiment of the present invention, showing a state in which an engagement portion and a trigger are engaged with each other.

FIG. 4 is a cross-sectional view of the welding wire cutting device according to the embodiment of the present invention, in which the pendulum type cutting tool is biased in the counterclockwise direction by the spring 16, but by the engagement between the engaging portion and the trigger. The movement is restricted.

FIG. 5 is a cross-sectional view of the welding wire cutting device in the embodiment of the present invention, showing a state where the engagement between the engagement portion and the trigger is released and the welding wire is cut.

FIG. 6 is a cross-sectional view of the welding wire cutting device in the embodiment of the present invention, showing a state when the pendulum type cutting tool is returned to the original position after cutting the welding wire.

[Explanation of symbols]

1 ... Welding wire cutting device 2 ... Pendulum type cutting tool (cutting tool), 2a ... Blade part,
2b ... Engaging piece, 2c ... Elastic member mounting piece 4 ... Torch guide (first guide mechanism) 5 ... Block (moving member) 8 ... Engaging portion 13 ... Cutting Blade 15 ... Pin (rotating shaft) 16 ... Spring (elastic member) 17 ... Trigger (regulating member, protrusion) 18 ... Lower block (base portion)

Claims (10)

[Claims] 1. A wire cutting device provided with a cutting tool for cutting a welding wire, comprising: a torch part of the welding device, or a first guide mechanism for guiding the welding wire protruding from the torch part; and the first guide. A base unit joined to the mechanism, and a pendulum blade that is rotatably supported by the base unit. The pendulum blade is a rotating mechanism that converts the biasing force of a spring into a force for rotating the blade. A welding wire cutting device, characterized in that the welding wire is cut by means of: 2. The base body includes a shaft slidably supported, and the pendulum type cutting tool has a protrusion so as to be rotatable after the base body has moved a predetermined distance. The main body of the wire cutting device includes a second guide mechanism that slidably supports the base body portion, and a contact portion that comes into contact with the protrusion after the base body portion has moved a predetermined distance. The welding wire cutting device according to claim 1. 3. The urging means has a spring for applying an urging force in a direction to return the pendulum type cutting tool to a position before rotation when the pendulum type cutting tool is rotated by a predetermined angle or more. The welding wire cutting device according to claim 1. 4. A base portion having an internal space, a first guide mechanism for projecting the welding wire into the internal space of the base portion and guiding the welding wire movably in a predetermined direction, and the welding wire described above. The cutting tool housed in the internal space of the base body so as to be movable up to the protruding portion of the base body, an elastic member for urging the cutting tool in a direction toward the protruding portion of the welding wire, and the cutting tool A welding wire cutting device comprising: a restricting member that restricts movement of the welding wire to the protruding portion; and a releasing unit that cancels restriction of movement of the cutting tool by the restricting member. 5. The regulating member according to claim 4, wherein the restricting member is a protrusion formed on an inner wall of the base portion, and the cutting tool includes an engaging portion that engages with the protrusion, The welding wire cutting device, wherein movement of the cutting tool to a protruding position of the welding wire is restricted by engagement with the engagement portion. 6. The releasing means according to claim 5, wherein the releasing means is relatively movable from a state where the protrusion and the engaging portion are engaged to a state where they are not engaged. A welding wire cutting device, wherein the movement regulation of the cutting tool is released. 7. The cutting tool according to claim 5, wherein the cutting tool has a cutting piece having a cutting blade for cutting the welding wire attached to a tip thereof, and the engaging portion formed at a tip thereof. An engaging piece, an elastic member attaching piece to which one end of the elastic member is attached, and a rotating shaft, the blade piece, the engaging piece, and the elastic member attaching centering on the rotating shaft. A welding wire cutting device, characterized in that the piece is rotatable. 8. The welding wire cutting device according to claim 7, wherein the rotating shaft moves in the predetermined direction as the welding wire moves in the predetermined direction. 9. The welding wire cutting device according to claim 8, wherein the welding wire moves in the predetermined direction together with the first guide mechanism. 10. The welding wire cutting device according to claim 9, further comprising a moving member that moves integrally with the first guide mechanism, and the rotating shaft is attached to the moving member. .