Welding wire cutting device

Abstract

To provide a welding wire cutting device that enables easy cut.SOLUTION: A welding wire cutting device 1 includes: a cutter pipe 2; a center pipe rotatably externally fit to the cutter pipe 2 with both end portions of the cutter pipe 2 exposed; a guide pipe 4 erected on an outer peripheral surface of the center pipe and to which a nozzle of a welding torch can be inserted; and a right and left pair of arm parts 5, 5. A cutter pipe support part 6a supporting both end portions of the cutter pipe 2 is provided in each of the arm parts 5, 5. A center pipe insertion hole 31 is formed in a peripheral wall of the center pipe located in a center part inside the guide pipe 4. A cutter pipe insertion hole 21 is formed in a peripheral wall of the cutter pipe 2. In a state where the center pipe insertion hole 31 and the cutter pipe insertion hole 21 communicate with each other, by inserting a distal end portion P of a welding wire W is inserted to both holes and rotating the center pipe 3 around the cutter pipe 2, the distal end portion P of the welding wire W is cut.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a welding wire cutting device suitable for cutting a welding wire fed from a nozzle of a welding torch used in arc welding. [Background technology]

[0002] Arc welding can be broadly divided into consumable electrode welding and non-consumable electrode welding, and consumable electrode welding includes covered electrode welding, gas-shielded arc welding, self-shielded arc welding, stud welding, etc. Among these, gas-shielded arc welding (carbon dioxide arc welding, MAG welding, MIG welding, etc.) that uses a welding torch is a semi-automatic welding method in which the welding wire is automatically fed from the nozzle of the welding torch.

[0003] Used as semi-automatic welding, CO2 arc welding is low cost, MIG welding can be used on non-ferrous metals such as aluminum, and MAG welding produces less spatter. However, there is a problem in that a solidification ball forms at the tip of the welding wire when welding is interrupted. When electricity from the welding power source is cut off during a welding interruption, the tip of the welding wire solidifies and becomes spherical due to the influence of surface tension, forming a solidification ball. If welding is resumed with a solidification ball at the tip of the welding wire, the welding wire may adhere to the contact tip inside the welding torch nozzle or a poor weld bead may result.

[0004] Furthermore, since spatter is more likely to occur, it takes more time than necessary to remove the spatter, and if the spatter adheres to the welded structure (base material), it can lead to a decrease in welding quality.

[0005] Therefore, in order to avoid as much as possible these problems caused by the solidified ball formed at the tip of the welding wire, when the welding operation is interrupted, the welding operator cuts off the tip of the welding wire with pliers, nippers, etc., to remove the solidified ball, and then resumes the welding operation.

[0006] Tools suitable for welding work, including cutting welding wire, have also been disclosed (see, for example, Patent Document 1). The welding torch maintenance tool disclosed in Patent Document 1 includes a pair of metal stays rotatably supported around a pivot shaft, crossing in an X shape, the pair of metal stays including: a grip portion on one side of the pivot shaft for a user to rotate the metal stays; a first clamping portion between the pivot shaft and the grip portion for clamping a nozzle of a welding torch when attaching or detaching the nozzle; a second clamping portion on the tip end of one side of the pivot shaft for contacting the inner and outer peripheral surfaces of the nozzle and clamping the nozzle when removing spatter adhering to the inner and outer peripheral surfaces of the nozzle; a third clamping portion on the other side of the pivot shaft for clamping a tip for leading out welding wire of the welding torch when attaching or detaching the tip; and a cutter blade on the other side of the pivot shaft for cutting the welding wire.

[0007] According to the welding torch maintenance tool disclosed in Patent Document 1, the second clamping portion is located on one side of the pivot shaft, i.e., on the tip side opposite the third clamping portion and the cutter blade, so that when the first clamping portion clamps the nozzle, when the third clamping portion clamps the tip, and when the cutter blade cuts the welding wire, the second clamping portion is located on the user side. Therefore, even in a narrow space where other objects such as walls or pillars exist around the welding torch, there is no risk of the second clamping portion coming into contact with other objects around the welding torch when the first clamping portion clamps the nozzle, when the third clamping portion clamps the tip, and when the cutter blade cuts the welding wire, the patent document states.

[0008] The inventor of the present application has also disclosed a welding wire cutting tool suitable for cutting welding wire fed from the nozzle of a welding torch (see Patent Document 2). The welding wire cutting tool disclosed in Patent Document 2 is characterized by comprising a cutting device body, a nozzle guide disposed on the outside of the blade portion of the cutting device body and into which the nozzle of a welding torch can be inserted, and a welding surface attachment portion disposed on one handle of the cutting device body and for attaching the cutting device body to the grip portion of the welding surface.

[0009] According to the welding wire cutting tool disclosed in Patent Document 2, when semi-automatic welding is performed using a handheld welding mask, the solidified ball formed at the tip of the welding wire when the welding work is interrupted can be easily cut off without having to switch between the welding mask and the welding wire cutting tool, thereby improving the efficiency of the welding work. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-198823 [Patent Document 2] Patent Publication No. 2021-194652 Summary of the Invention [Problem to be solved by the invention]

[0011] The welding torch maintenance tool disclosed in Patent Document 1 allows for the attachment and detachment of nozzles, attachment and detachment of tips, and cutting of welding wire with a single tool, and because the second clamping portion is located on the user's side when clamping the nozzle with the first clamping portion, clamping the tip with the third clamping portion, and cutting the welding wire with the cutter blade, it is believed that even in a narrow space with other objects such as walls or pillars around the welding torch, there is little risk of the second clamping portion coming into contact with other objects around the welding torch when clamping the nozzle with the first clamping portion. Furthermore, it is believed that the solidified ball formed at the tip of the welding wire when welding operation is interrupted can be removed with the cutter blade of the welding torch maintenance tool disclosed in Patent Document 1.

[0012] However, when semi-automatic welding is performed using a handheld welding mask, in order to remove the solidified ball at the tip of the welding wire, it is necessary to switch between the handheld welding mask and the welding torch maintenance tool disclosed in Patent Document 1. In other words, the switching work is required every time the welding work is interrupted, which is very cumbersome, and also requires a place to store the handheld welding mask and the welding torch maintenance tool.

[0013] The welding wire cutting tool disclosed in Patent Document 2 allows for easy cutting of the solidified ball formed at the tip of the welding wire when the welding operation is interrupted during semi-automatic welding using a handheld welding mask, without the need to switch between the welding mask and the welding wire cutting tool, thereby improving the efficiency of the welding operation. However, there has been a demand for a welding wire cutting tool that allows for even easier cutting.

[0014] In view of the above problems, the inventors of the present application have conducted extensive research to provide a welding wire cutting device that, when performing semi-automatic welding using a handheld welding mask, can very easily cut off the solidified ball that forms at the tip of the welding wire when the welding operation is interrupted, without having to switch between the handheld welding mask and the solidified ball cutter, and as a result have arrived at the present invention. [Means for solving the problem]

[0015] That is, the welding wire cutting device of the present invention is a cutting device for welding wire fed from the nozzle of a welding torch, and comprises a cutter pipe, a center pipe rotatably fitted onto the cutter pipe with both ends of the cutter pipe exposed, a guide pipe erected on the outer circumferential surface of the center pipe in a direction perpendicular to the rotation axis of the center pipe and into which the nozzle of the welding torch can be inserted, and a pair of bifurcated left and right arms on one side, each arm having a cutter pipe support portion for supporting both ends of the cutter pipe, and a welding surface gripper attached to the other side. and a frame main body having a welding surface mounting portion for mounting the welding wire to the center pipe, wherein a center pipe insertion hole, through which the tip of the welding wire can be inserted, is formed in the peripheral wall of the center pipe located in the center of the guide pipe, and a cutter pipe insertion hole, through which the tip of the welding wire can be inserted, is formed in the peripheral wall of the cutter pipe, and the tip of the welding wire is cut off by inserting the tip of the welding wire into both holes while the center pipe insertion hole and the cutter pipe insertion hole are in communication with each other, and rotating the center pipe around the cutter pipe as a rotation axis.

[0016] Furthermore, the welding wire cutting device of the present invention is characterized in that it includes a biasing means for biasing the center pipe in a direction opposite to the rotation direction for cutting the tip of the welding wire, and when the center pipe is biased to rotate and the guide pipe erected on the center pipe is stopped by the welding surface attachment portion, the center pipe insertion hole and the cutter pipe insertion hole are brought into communication with each other.

[0017] Furthermore, in the welding wire cutting device of the present invention, a spatter removal wall is erected along the periphery of the center pipe insertion hole.

[0018] Furthermore, in the welding wire cutting device of the present invention, a cutter pipe through hole having a diameter larger than that of the cutter pipe through hole is formed at a position opposite to the position where the cutter pipe insertion hole is formed in the peripheral wall of the cutter pipe, and a center pipe through hole having a diameter equal to or larger than that of the cutter pipe through hole is formed at a position opposite to the position where the center pipe insertion hole is formed in the peripheral wall of the center pipe, and when the center pipe insertion hole and the cutter pipe insertion hole are connected, the center pipe through hole and the cutter pipe through hole are connected to each other. [Effects of the Invention]

[0019] According to the welding wire cutting device of the present invention, when semi-automatic welding is performed using a handheld welding surface, the solidified ball formed at the tip of the welding wire when the welding operation is interrupted can be very easily cut off without having to switch between the welding surface and the welding wire cutting tool, thereby improving the efficiency of the welding operation.

[0020] In addition, in the welding wire cutting device of the present invention, a biasing means is provided that biases the center pipe in a direction opposite to the rotation direction for cutting the tip of the welding wire, and when the center pipe is biased to rotate and hits the welding surface mounting portion, the center pipe insertion hole and the cutter pipe insertion hole are brought into communication with each other.As a result, when it is desired to cut the tip of the welding wire, the center pipe insertion hole and the cutter pipe insertion hole are maintained in a communication state, so that the tip of the welding wire can be easily inserted into the center pipe insertion hole and the cutter pipe insertion hole by simply inserting the nozzle of the welding torch into the guide pipe.

[0021] After the tip of the welding wire is cut by rotating the center pipe in the cutting direction via the guide pipe, when the nozzle of the welding torch is removed from the guide pipe, the center pipe rotates in the opposite direction to the cutting direction by the biasing means, and when the guide pipe is stopped by impact with the welding surface mounting portion, preventing the center pipe from rotating, the center pipe insertion hole and the cutter pipe insertion hole become connected, so that the next time you want to cut the tip of the welding wire, you can immediately perform the cutting operation.

[0022] Furthermore, in the welding wire cutting device of the present invention, a spatter removal wall is erected along the periphery of the center pipe insertion hole, so that when the nozzle of the welding torch is inserted into the guide pipe, the inner wall surface of the nozzle comes into contact with the spatter removal wall, and spatter adhering to the inner wall surface of the nozzle can be scraped off by the spatter removal wall.

[0023] In addition, in the welding wire cutting device of the present invention, a cutter pipe through hole having a diameter larger than that of the cutter pipe through hole is formed in the peripheral wall of the cutter pipe at a position opposite to the position where the cutter pipe insertion hole is formed, and a center pipe through hole having a diameter equal to or larger than that of the cutter pipe through hole is formed in the peripheral wall of the center pipe at a position opposite to the position where the center pipe insertion hole is formed, so that when the center pipe insertion hole and the cutter pipe through hole are connected, the center pipe through hole and the cutter pipe through hole are connected, and even if the tip of the welding wire is long, it is possible to insert the welding wire into the center pipe through hole and the cutter pipe through hole. This prevents the tip of the welding wire from getting stuck in the cutter pipe, making it difficult to insert the tip of the nozzle into the guide pipe, or the tip of the welding wire from bending in the cutter pipe, resulting in poor cutting.

[0024] Furthermore, since the diameter of the cutter pipe through hole is larger than the diameter of the cutter pipe insertion hole and the diameter of the center pipe through hole is equal to or larger than the diameter of the cutter pipe through hole, even if the tip of the welding wire is long, the tip of the welding wire inserted into the center pipe insertion hole and the cutter pipe insertion hole can be smoothly inserted into the cutter pipe through hole and the center pipe through hole, making it easy to prevent the welding wire from getting stuck or bending inside the cutter pipe.

[0025] Furthermore, the diameters of the cutter pipe through hole and the center pipe through hole are increased, so that even when the center pipe is rotated to cut off the tip of the welding wire, a portion where the cutter pipe through hole and the center pipe through hole communicate with each other is ensured. Therefore, even if the tip of the welding wire is long, the tip of the welding wire inserted into the cutter pipe through hole and the center pipe through hole does not impede the rotation of the center pipe. [Brief explanation of the drawings]

[0026] [Figure 1]1A, 1B, and 1C show a welding wire cutting device according to an embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a plan view, and FIG. 1C is a bottom view. [Figure 2] 2A is a left side view of the welding wire cutting device shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. [Figure 3] 2A is a left side view of the welding wire cutting device shown in FIG. 1 at a different angle, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. [Figure 4] 1. (a) shows the cutter pipe of the welding wire cutting device shown in FIG. 1, (b) shows the center pipe, and (c) shows the cutter pipe and center pipe combined. [Figure 5] 2 is a front view showing a state in which a welding surface is attached to the welding wire cutting device shown in FIG. 1 (a rear view of the welding wire cutting device). FIG. [Figure 6] FIG. 6 is a right side view of the state shown in FIG. 5 (a left side view of the welding wire cutting device). [Figure 7] 2A and 2B are schematic explanatory views showing how the welding wire is cut by the welding wire cutting device shown in FIG. 1, where (a) shows the state before cutting and (b) shows the state after cutting. [Figure 8] 1A is a left side view of a welding wire cutting device according to another embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. [Figure 9] 9A and 9B are schematic explanatory views showing how the welding wire is cut by the welding wire cutting device shown in FIG. 8, where (a) shows the state before cutting and (b) shows the state after cutting. [Figure 10] (a) shows another embodiment of a cutter pipe for the welding wire cutting device of the present invention, (b) shows another embodiment of a center pipe for the welding wire cutting device of the present invention, and (c) shows the cutter pipe of (a) combined with the center pipe of (b). [Figure 11] 11A is a left side view of the welding wire cutting device equipped with the cutter pipe and center pipe shown in FIG. 10, and FIG. 11B is a cross-sectional view taken along the line BB in FIG. [Figure 12]12A and 12B are schematic explanatory views showing how the welding wire is cut by the welding wire cutting device shown in FIG. 11, where (a) shows the state before cutting and (b) shows the state after cutting. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of a welding wire cutting device of the present invention will be described in detail with reference to the drawings. Figures 1(a) to 1(c) are a front view, a plan view, and a bottom view showing the appearance of a welding wire cutting device 1 according to one embodiment of the present invention, Figure 2 is a left side view and an AA cross-sectional view of the welding wire cutting device 1 of this embodiment, and Figure 3 is a left side view and a BB cross-sectional view of the welding wire cutting device 1 of this embodiment at a different angle. First, as shown in these figures, a welding wire cutting device 1 according to one embodiment of the present invention is a cutting device for welding wire W fed out from a nozzle 60 of a welding torch, and comprises a cutter pipe 2, a center pipe 3 that is rotatably fitted onto the cutter pipe 2 with both ends 2a and 2b of the cutter pipe 2 exposed, a guide pipe 4 that is erected on the outer surface of the center pipe 3 in a direction perpendicular to the rotation axis of the center pipe 3 and into which the nozzle 60 of the welding torch can be inserted, and a frame main body 8 that has a pair of bifurcated arm portions 5, 5 on one side, and cutter pipe support portions 6a, 6b on each arm portion 5, 5 that support both ends 2a and 2b of the cutter pipe 2, respectively, and a welding mask mounting portion 7 on the other side for mounting a gripping portion 41 of a welding mask 40.

[0028] As shown in FIG. 4( a), the cutter pipe 2 of the welding wire cutting device 1 of this embodiment has an elongated cylindrical shape, and a cutter pipe insertion hole 21 is formed in the peripheral wall of the cutter pipe 2, through which the tip P of the welding wire W can be inserted. As will be described later, the cutter pipe insertion hole 21 functions as a cutting blade for cutting the tip P of the welding wire W. Therefore, the cutter pipe of the welding wire cutting device of the present invention may have at least one cutter pipe insertion hole. However, in the embodiment shown in FIG. 4( a), another cutter pipe insertion hole 21 is formed at a position 90° from the position where the upper cutter pipe insertion hole 21 is formed. This means that if the cutting function of one cutter pipe insertion hole 21 deteriorates, the cutter pipe 2 can be restored by rotating the cutter pipe 2 to use the other cutter pipe insertion hole 21 without replacing the cutter pipe 2 itself, thereby reducing maintenance costs. The through hole 11 formed at the end of the cutter pipe 2 is intended to allow a rod-shaped object to be inserted into the opposing through holes 11, 11 to rotate the cutter pipe 2 when adjusting the position of the cutter pipe insertion hole 21, but is not an essential component of the present invention.

[0029] As shown in FIG. 4( b ), the center pipe 3 in the welding wire cutting device 1 of this embodiment is tubular and shorter than the cutter pipe 2. A center pipe insertion hole 31 is formed in the peripheral wall of the center pipe 3, through which the tip P of the welding wire W can be inserted. When the cutter pipe 2 is inserted into the center pipe 3, the center pipe 3 is fitted onto the cutter pipe 2 so as to be rotatable around the cutter pipe 2 as a rotation axis. When the cutter pipe 2 is inserted into the center pipe 3, both end portions 2a, 2b of the cutter pipe 2 are exposed from both ends of the center pipe 3, and both end portions 2a, 2b of the cutter pipe 2 are supported by cutter pipe supports 6a, 6b, as will be described in detail below.

[0030] As shown in FIGS. 2(a) and 3(a), a guide pipe 4 is erected on the outer peripheral surface of the center pipe 3 in a direction perpendicular to the rotation axis (= cutter pipe 2) of the center pipe 3. The guide pipe 4 is cylindrical and, as shown in FIG. 7(a) and other figures, a welding torch nozzle 60 is inserted into the guide pipe 4, so that the guide pipe 4 has a diameter slightly larger than the outer diameter of the welding torch nozzle 60 to be used. The guide pipe 4 is erected at a position where the axis of the guide pipe 4 coincides with a center pipe insertion hole 31 formed in the peripheral wall of the center pipe 3, so as to surround the center pipe insertion hole 31. In other words, the center pipe insertion hole 31, through which the tip P of the welding wire W can be inserted, is formed in the peripheral wall of the center pipe 3 located in the center of the guide pipe 4.

[0031] 1, the frame main body 8 of the welding wire cutting device 1 of this embodiment has a pair of bifurcated arm sections 5, 5 on one side (the lower side in FIG. 1(a)), and each arm section 5, 5 has cutter pipe support sections 6a, 6b that respectively support both ends 2a, 2b of the cutter pipe 2. The cutter pipe support sections 6a, 6b are cylindrical members that are respectively connected and fixed to the pair of left and right arm sections 5, 5, and the cutter pipe 2 is inserted into the cutter pipe support sections 6a, 6b, and the center pipe 3 is rotatably supported between the cutter pipe support sections 6a, 6b. In this embodiment, the method of supporting and fixing the cutter pipe 2 to the cutter pipe support parts 6a, 6b is to insert the cutter pipe 2 into the cutter pipe support parts 6a, 6b and fix one end 2a of the cutter pipe 2 to the cutter pipe support part 6a, and the other end 2b of the cutter pipe 2 to the cutter pipe support part 6b with a hexagon socket set screw (= set screw) 10, but the method of supporting and fixing the cutter pipe 2 is not particularly limited as long as it is possible to prevent the cutter pipe 2 inserted into the cutter pipe support parts 6a, 6b from rotating.

[0032] Furthermore, the other side (the upper side in FIG. 1( a)) of the frame body 8 of the welding wire cutting device 1 of this embodiment is provided with a welding mask attachment part 7 for attaching the grip part 41 of the welding mask 40. FIGS. 5 and 6 show the state in which the grip part 41 of the welding mask 40 is attached to the welding mask attachment part 7 of the welding wire cutting device 1 of this embodiment. As shown in these figures, the lower end of the grip part 41 is inserted into the welding mask attachment part 7, and the welding mask attachment part 7 is fastened to the grip part 41 with a screw, for example, by using attachment holes 12 formed in the welding mask attachment part 7. Welding masks come in handheld and head-mounted types. While handheld welding masks 40 have the disadvantage of restricting the use of both hands, they are easy to use and very inexpensive, so there is still a high demand for handheld types.

[0033] With the welding wire cutting device 1 of this embodiment having at least the above configuration, it is possible to very easily cut off the tip P of the welding wire W even when welding is performed using a handheld welding mask 40. Specifically, as shown in FIG. 5 , the welding wire cutting device 1 of this embodiment is attached to the gripping portion 41 of the welding mask 40, and the welding operation is performed by gripping the welding mask attachment portion 7 of the welding wire cutting device 1 of this embodiment. At this time, the center pipe insertion hole 31 located in the center of the guide pipe 4 and the cutter pipe insertion hole 21 formed in the cutter pipe 2 are maintained in communication (see FIG. 3 ). Here, a method for easily establishing communication between the center pipe insertion hole 31 and the cutter pipe insertion hole 21 is to rotate the guide pipe 4 erected on the center pipe 3 upward about the cutter pipe 2 as a rotation axis, as shown in FIG. 3 , and align the position of the cutter pipe insertion hole 21 in advance with the position of the center pipe insertion hole 31 when the guide pipe 4 hits the welding mask attachment portion 7. By using the position of the center pipe insertion hole 31 when the guide pipe 4 is stopped by the welding surface mounting portion 7 as a reference, and aligning the position of the cutter pipe insertion hole 21 with the position of the center pipe insertion hole 31 at this time and fixing the cutter pipe 2, the center pipe insertion hole 31 and the cutter pipe insertion hole 21 can easily be made to communicate with each other.

[0034] When the welding operation is interrupted, a solidification ball is formed at the tip P of the welding wire W. When the welding operation is to be resumed, while still holding the welding surface attachment portion 7 of the welding wire cutting device 1 of this embodiment, the tip of the nozzle 60 of the welding torch is inserted into the guide pipe 4 of the welding wire cutting device 1 of this embodiment, as shown in FIG. 7( a) . When the tip of the nozzle 60 of the welding torch is inserted into the guide pipe 4, the tip P of the welding wire W protruding from the tip of the nozzle 60 is inserted into the center pipe insertion hole 31 and the cutter pipe insertion hole 21 disposed in the guide pipe 4.

[0035] Then, as shown in FIG. 7(b), when the welding torch is moved downward with the nozzle 60 of the welding torch still inserted in the guide pipe 4, the center pipe 3 rotates around the cutter pipe 2 as a rotation axis via the guide pipe 4 as the welding torch moves, and the tip P of the welding wire W is cut by the cutter pipe insertion hole 21 of the cutter pipe 2 fixed to the frame main body 8, making it possible to easily remove the solidified ball formed at the tip P.

[0036] The welding wire cutting device 1 of this embodiment is provided with a shaft 9 for restricting downward (cutting direction) rotation of the center pipe 3 and the guide pipe 4 (see FIG. 1). When cutting the welding wire W, as the center pipe 3 is rotated downward (cutting direction) via the guide pipe 4, the guide pipe 4 is stopped by the shaft 9, as shown in FIG. 7(b), restricting the rotation of the center pipe 3. This prevents the center pipe 3 and the guide pipe 4 from rotating more than necessary, improving work efficiency.

[0037] As described above, with the welding wire cutting device 1 of this embodiment, when semi-automatic welding is performed using the handheld welding surface 40, the solidified ball formed at the tip P of the welding wire W when the welding operation is interrupted can be very easily removed without having to switch between the welding surface 40 and the welding wire cutting device 1, thereby improving the efficiency of the welding operation.

[0038] The welding wire cutting device 1 according to one embodiment of the present invention has been described in detail above. However, as shown in FIG. 3( b), the welding wire cutting device 1 of this embodiment preferably includes biasing means 13 that biases the center pipe 3 in a direction opposite to the rotation direction for cutting the tip P of the welding wire W. That is, by providing biasing means 13 for biasing the center pipe 3 from the state shown in FIG. 7( b) to the state shown in FIG. 7( a), when the center pipe 3 is biased and rotated, the guide pipe 4 erected on the center pipe 3 is stopped by the welding surface attachment portion 7. By adjusting the positions of the center pipe insertion hole 31 and the cutter pipe insertion hole 21 in advance so that they are in communication with each other in this state, when it is desired to cut the tip P of the welding wire W, the center pipe insertion hole 31 and the cutter pipe insertion hole 21 are maintained in communication with each other. Therefore, by simply inserting the nozzle 60 of the welding torch into the guide pipe 4, the tip P of the welding wire W can be easily inserted into the center pipe insertion hole 31 and the cutter pipe insertion hole 21.

[0039] 7(b), after cutting tip P of welding wire W by rotating center pipe 3 in the cutting direction via guide pipe 4, when welding torch nozzle 60 is pulled out of guide pipe 4, center pipe 3, which is biased by biasing means 13 in the direction opposite to the cutting direction, rotates, causing guide pipe 4 to also rotate, and as shown in FIG. 7(a), guide pipe 4 hits welding surface attachment portion 7, preventing center pipe 3 from rotating. This returns center pipe insertion hole 31 and cutter pipe insertion hole 21 to a state where they are in communication again, allowing the next welding wire cutting operation to be performed immediately, greatly improving work efficiency.

[0040] A spring, for example, can be used as the biasing means 13. In this embodiment, by providing the biasing means 13 that utilizes a spiral spring, the center pipe 3 is biased so as to change from the state shown in FIG. 7(b) to the state shown in FIG. 7(a).

[0041] 8 shows another embodiment of the present invention, in which a spatter removal wall 32 is erected along the periphery of a center pipe insertion hole 31 formed in the peripheral wall of a center pipe 3 located in the center of a guide pipe 4. The spatter removal wall 32 is disposed so as to surround the periphery of the center pipe insertion hole 31, and is configured so that a nozzle 60 of a welding torch can be inserted between the inner peripheral surface of the guide pipe 4 and the outer peripheral surface of the spatter removal wall 32.

[0042] When cutting the tip portion P of the welding wire W with the welding wire cutting device 1a of this embodiment, as shown in Fig. 9(a), the nozzle 60 of the welding torch is inserted into the guide pipe 4 of the welding wire cutting device 1a of this embodiment. When the nozzle 60 of the welding torch is inserted into the guide pipe 4, the tip portion P of the welding wire W protruding from the tip of the nozzle 60 is inserted into the center pipe insertion hole 31 and the cutter pipe insertion hole 21 disposed in the guide pipe 4, and the spatter removal wall 32 is inserted into the nozzle 60 along the inner wall surface 61 of the nozzle 60 of the welding torch.

[0043] Here, spatter generated during welding adheres to the inner wall surface 61 of the nozzle 60 of the welding torch, and therefore it is necessary to periodically remove the spatter that has adhered to the inner wall surface 61 of the nozzle 60. However, since the welding wire cutting device 1a of this embodiment is provided with the spatter removal wall 32, when the nozzle 60 is inserted into the guide pipe 4, the inner wall surface 61 of the nozzle 60 comes into contact with the spatter removal wall 32, and the spatter that has adhered to the inner wall surface 61 of the nozzle 60 can be scraped off by the spatter removal wall 32, thereby significantly reducing the work of removing the spatter.

[0044] Also, as shown in FIG. 9(b), when cutting the tip P of the welding wire W, the inner wall surface 61 of the nozzle 60 rubs against the spatter removal wall 32, thereby removing spatter adhering to the inner wall surface 61 of the nozzle 60.

[0045] Although the spatter removal wall 32 shown in Figures 8 and 9 is a cylindrical peripheral wall, the shape of the spatter removal wall 32 is not particularly limited, and it may be a peripheral wall whose upper end is corrugated, or a peripheral wall formed by arranging several divided walls along the periphery of the center pipe insertion hole 31.

[0046] Although the embodiments of the welding wire cutting device of the present invention have been described in detail above, the above embodiments should not be construed as substantially limiting the technical concept of the present invention. For example, the number of cutter pipe insertion holes 21 formed in the cutter pipe 2 according to the embodiments of the present invention is not particularly limited, but preferably up to about three. Furthermore, the positions at which the cutter pipe insertion holes 21 are formed are also not particularly limited, but it is preferable to form other cutter pipe insertion holes 21 at positions that do not face the positions at which one cutter pipe insertion hole 21 is formed.

[0047] When forming multiple cutter pipe insertion holes 21 in the cutter pipe 2 according to the embodiment of the present invention, as described above, it is preferable to form the other cutter pipe insertion holes 21 at positions that do not correspond to the position at which one cutter pipe insertion hole 21 is formed (see FIG. 4 ). However, for example, as in the cutter pipe 20 according to the welding wire cutting device of the present invention shown in FIG. 10( a), a cutter pipe through hole 22 having a larger diameter than the cutter pipe insertion hole 21 may be formed at a position at which the cutter pipe insertion hole 21 is formed in the peripheral wall of the cutter pipe 20 and corresponds to the position at which the cutter pipe insertion hole 21 is formed, and a center pipe through hole 33 having a diameter equal to or larger than the diameter of the cutter pipe through hole 22 may be formed at a position at which the center pipe insertion hole 31 is formed in the peripheral wall of the center pipe 30 and corresponds to the position at which the center pipe insertion hole 31 is formed, as in the center pipe 30 according to the welding wire cutting device of the present invention shown in FIG.

[0048] By forming the cutter pipe through hole 22 at a position opposite to the position where the cutter pipe insertion hole 21 is formed, and by forming the center pipe through hole 33 at a position opposite to the position where the center pipe insertion hole 31 is formed, when the center pipe insertion hole 31 and the cutter pipe insertion hole 21 are connected, as shown in Figure 10 (c), the center pipe through hole 33 and the cutter pipe through hole 22 are connected.

[0049] Fig. 11 shows a welding wire cutting device 1b according to another embodiment of the present invention, which is equipped with the cutter pipe 20 and center pipe 30 shown in Fig. 10. As shown in the figure, in the welding wire cutting device 1b of this embodiment, when the center pipe insertion hole 31 of the center pipe 30 disposed in the guide pipe 4 is brought into communication with the cutter pipe insertion hole 21 of the cutter pipe 20, the cutter pipe through hole 22 and the center pipe through hole 33 are brought into communication with each other.

[0050] When cutting off a solidified ball formed at a tip P of a welding wire W using the welding wire cutting device 1b of this embodiment, the tip of a nozzle 60 of a welding torch is inserted into the guide pipe 4 of the welding wire cutting device 1b of this embodiment, as shown in Fig. 12(a) . When the tip of the nozzle 60 of the welding torch is inserted into the guide pipe 4, the tip P of the welding wire W protruding from the tip of the nozzle 60 is inserted into the center pipe insertion hole 31 and the cutter pipe insertion hole 21 disposed in the guide pipe 4.

[0051] In the welding wire cutting device 1b of this embodiment, a cutter pipe through hole 22 is formed at a position opposite to the position where the cutter pipe insertion hole 21 is formed, and a center pipe through hole 33 is formed at a position opposite to the position where the center pipe insertion hole 31 is formed, and these cutter pipe through hole 22 and center pipe through hole 33 are in communication with each other. Therefore, even if the tip portion P of the welding wire W protruding from the tip of the nozzle 60 is long and cannot be accommodated within the cutter pipe 20, the tip portion P of the welding wire W inserted through the center pipe insertion hole 31 and the cutter pipe insertion hole 21 can be inserted into the cutter pipe through hole 22 and the center pipe through hole 33. Therefore, even if the tip portion P of the welding wire W is long, it is possible to prevent the tip portion P from clogging inside the cutter pipe 20, making it difficult to insert the tip of the nozzle 60 into the guide pipe 4, or the tip portion P of the welding wire W from bending inside the cutter pipe 20, resulting in poor cutting.

[0052] Furthermore, the diameter of the cutter pipe through hole 22 is larger than that of the cutter pipe insertion hole 21, and the diameter of the center pipe through hole 33 is equal to or larger than the diameter of the cutter pipe through hole 22. In other words, by making the diameters of the cutter pipe through hole 22 and the center pipe through hole 33 larger than the diameters of the center pipe insertion hole 31 and the cutter pipe insertion hole 21, even if the tip portion P of the welding wire W is long, the tip portion P inserted into the center pipe insertion hole 31 and the cutter pipe insertion hole 21 can be smoothly inserted into the cutter pipe through hole 22 and the center pipe through hole 33, and clogging or bending inside the cutter pipe 20 can be easily prevented.

[0053] Then, as shown in FIG. 12(b), when the welding torch is moved downward with the nozzle 60 of the welding torch still inserted in the guide pipe 4, the center pipe 30 rotates around the cutter pipe 20 as a rotation axis via the guide pipe 4 as the welding torch moves, and the tip P of the welding wire W is cut by the cutter pipe insertion hole 21 of the cutter pipe 20 fixed to the frame main body 8, making it possible to easily remove the solidified ball formed at the tip P.

[0054] Furthermore, in this embodiment, the diameters of the cutter pipe through hole 22 and the center pipe through hole 33 are large so that a portion in which the cutter pipe through hole 22 and the center pipe through hole 33 communicate with each other is ensured even when the center pipe 30 is rotated. Therefore, although the tip portion P of the welding wire W is cut by the cutter pipe insertion hole 21, the tip portion P of the welding wire W inserted into the cutter pipe through hole 22 and the center pipe through hole 33 is not cut and does not provide resistance to the rotation of the center pipe 30. In other words, even when the tip portion P of the welding wire W is inserted into the cutter pipe through hole 22 and the center pipe through hole 33, the tip portion P of the welding wire W can be cut with a force equivalent to that of the welding wire cutting device 1 according to the embodiment of the present invention shown in FIG. 7.

[0055] Although the diameter of the center pipe through hole 33 in the welding wire cutting device 1b of this embodiment is larger than the diameter of the cutter pipe through hole 22, the diameter of the center pipe through hole 33 only needs to be the same size or larger as the diameter of the cutter pipe through hole 22, as long as a portion where the cutter pipe through hole 22 and the center pipe through hole 33 are connected can be secured even when the center pipe 30 is rotated.

[0056] The cutter pipe 20 and the center pipe 30 of the welding wire cutting device 1b of this embodiment can also be applied to the welding wire cutting device 1a according to the embodiment of the present invention shown in FIG.

[0057] Additionally, the shape of the welding surface attachment portion of the welding wire cutting device of the present invention is not particularly limited, and can be changed as appropriate to match the shape of the grip portion of the handheld welding surface.

[0058] Furthermore, in the welding wire cutting device of the present invention, the welding mask attachment portion 7 according to the above-described embodiment is formed in a generally rectangular tube shape so that the grip portion 41 of the handheld welding mask 40 can be inserted therein, but it may also be formed in a clip shape, for example, so that the welding mask attachment portion can be clamped by this clip-shaped welding mask attachment portion to integrally dispose the welding wire cutting device of the present invention on the welding mask 40. The present invention can be implemented with appropriate improvements, modifications, and additions made by the ingenuity and ingenuity of those skilled in the art without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0059] 1, 1a, 1b: welding wire cutting device 2,20: Cutter pipe 2a, 2b: End of cutter pipe 3,30: Center pipe 4: Guide pipe 5: Arm section 6a, 6b: Cutter pipe support part 7: Welding surface attachment part 8: Frame body 9: Shaft 10: Hexagon socket set screw (= grub screw) 11:Through hole 12: Mounting hole 13: biasing means 21: Cutter pipe insertion hole 22: Cutter pipe through hole 31: Center pipe insertion hole 32: Spatter removal wall 33: Center pipe through hole 40: Welding mask 41: Grip part 60: Nozzle 61: Inner wall surface W: Welding wire P:Tip

Claims

1. A cutting device for a welding wire fed from a nozzle of a welding torch, Cutter pipe and a center pipe rotatably fitted onto the cutter pipe with both end portions of the cutter pipe exposed; a guide pipe provided on an outer peripheral surface of the center pipe in a direction perpendicular to the rotation axis of the center pipe, into which the nozzle of the welding torch can be inserted; a frame body on one side including a pair of bifurcated left and right arm portions, each arm portion including a cutter pipe support portion for supporting both ends of the cutter pipe, and on the other side including a welding surface attachment portion for attaching a gripping portion of a welding surface; and a center pipe insertion hole through which the tip end of the welding wire can be inserted is formed in a peripheral wall of the center pipe located at the center of the guide pipe; a cutter pipe insertion hole through which a tip end of the welding wire can be inserted is formed in a peripheral wall of the cutter pipe; a welding wire cutting device comprising: a center pipe insertion hole and a cutter pipe insertion hole; a tip end of the welding wire inserted through both holes while the center pipe insertion hole and the cutter pipe insertion hole are in communication with each other; and the center pipe is rotated around the cutter pipe as a rotation axis, thereby cutting off the tip end of the welding wire.

2. a biasing means for biasing the center pipe in a direction opposite to a rotation direction for cutting the tip of the welding wire, 2. The welding wire cutting device according to claim 1, wherein when the center pipe is biased to rotate and the guide pipe erected on the center pipe is stopped by the welding surface attachment portion, the center pipe insertion hole and the cutter pipe insertion hole are brought into communication with each other.

3. 3. The welding wire cutting device according to claim 1, wherein a spatter removal wall is erected along the periphery of the center pipe insertion hole.

4. a cutter pipe through-hole having a diameter larger than that of the cutter pipe insertion hole is formed at a position opposite to the position where the cutter pipe insertion hole is formed in the peripheral wall of the cutter pipe; a center pipe through hole having a diameter equal to or larger than the cutter pipe through hole is formed in a peripheral wall of the center pipe at a position opposite to the position where the center pipe insertion hole is formed; 3. The welding wire cutting device according to claim 1, wherein when the center pipe insertion hole and the cutter pipe insertion hole are connected to each other, the center pipe through hole and the cutter pipe through hole are connected to each other.

5. a cutter pipe through-hole having a diameter larger than that of the cutter pipe insertion hole is formed at a position opposite to the position where the cutter pipe insertion hole is formed in the peripheral wall of the cutter pipe; a center pipe through hole having a diameter equal to or larger than the cutter pipe through hole is formed in a peripheral wall of the center pipe at a position opposite to the position where the center pipe insertion hole is formed; 4. The welding wire cutting device according to claim 3, wherein when the center pipe insertion hole and the cutter pipe insertion hole are brought into communication with each other, the center pipe through hole and the cutter pipe through hole are brought into communication with each other.

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