JP2993946B1 - Filament coil cutting device and cutting method - Google Patents

Abstract

An object of the present invention is to provide a filament coil cutting device and a cutting method with high productivity. SOLUTION: A mandrel blade 11 in which a spiral groove 12 is formed on the surface, and a part R of a mountain 13 located between adjacent grooves 12 is formed higher than other grooves 12. And a holding mechanism 14 for holding the raised portion R of the ridge 13 of the mandrel blade 11, and a cutter blade 15 for cutting a long coil wound around the mandrel blade 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament coil cutting device and a cutting method for cutting a long coil into a predetermined length in order to manufacture a filament coil such as a magnetron used for a microwave oven.

[0002]

2. Description of the Related Art A conventional filament coil cutting device will be described with reference to FIG. 3 taking a magnetron filament coil as an example. Reference numeral 31 denotes a mandrel blade,
The mandrel blade 31 includes a support portion 31a, a winding portion 31b having a smaller diameter than the support portion 31a, and the like. The support 31a of the mandrel blade 31 is supported in a cantilever manner. A spiral groove 31c is formed at the tip of the winding portion 31b. The line segment MM is a mandrel blade 31.
Are shown.

Reference numeral 32 denotes a cutter blade.
A blade 32a is formed at the tip of the. Cutter blade 32
Has a structure that advances or retreats toward the tip of the mandrel blade 31, as indicated by arrows Y1 and Y2.

[0004] Here, the method of cutting the long coil to a predetermined length will be described with reference to FIG. 4 using the cutting apparatus described above. 4, parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and duplicate description will be partially omitted.

First, as shown in FIG. 4A, the mandrel blade 31 is rotated in the direction of arrow Y3. Mandrel blade 3
Using one rotation, the long coil 41 is wound around the winding portion 31b using the spiral groove 31c as a guide.

Next, as shown in FIG. 4 (b), a predetermined length of the filament coil for magnetron (reference numeral L in the figure) is wound around the winding portion 3b, and the rotation of the mandrel blade 31 is stopped.

Next, the cutter blade 32 is connected to the mandrel blade 31.
Is advanced in the arrow Y1 direction, and the long coil 41 is cut by abutting.

Next, as shown in FIG. 4C, an arrow Y4 opposite to the case where the long coil 41 is wound around the winding portion 31b.
The mandrel blade 31 is rotated in the direction, and the coil 41a cut to a specified length is taken out.

[0009]

In a conventional filament coil cutting device, a mandrel blade is supported in a cantilever manner. For this reason, rigidity at the time of cutting a long coil with a cutter blade is insufficient. Therefore, when cutting a long coil,
For example, a method of heating a long coil is used.

When cutting a long coil, a step of winding the long coil around the mandrel blade, a step of cutting the long coil, and a step of moving the mandrel blade in the opposite direction to secure a coil of a specified size. Several steps are required, such as a step of rotating and taking out a coil. As a result, the cutting cycle time for obtaining a coil of a specified size becomes longer, and the productivity is reduced.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a filament coil cutting device and a cutting method with high productivity.

[0012]

According to the filament coil cutting device of the present invention, it is possible to determine whether the long coil is rotated at one end by rotation.
A mandrel blade having a spiral groove formed on the surface thereof, and a part of a ridge located between adjacent grooves being formed higher than other parts; and a mandrel blade having a higher height. A holding mechanism for holding the crest portion, and a tip end on the other end side of the mandrel blade.
Forward and retract from the tip of the mandrel blade,
And a cutter blade for cutting the long coil protruding from the tip of the mandrel blade .

In the method for cutting a filament coil according to the present invention, a spiral groove is formed on the surface, and a part of a mountain located between adjacent grooves is formed to be higher than other parts. A first step of holding the crest portion of the mandrel blade that is formed high, and winding the mandrel blade from one end side of the mandrel blade while rotating a long coil with the spiral groove serving as a guide; The other end of the blade
A second step to make a part of the long coil from protruding from, a third step of stopping the rotation of the long coil, mosquito
Cutter blade toward the other end of the mandrel blade.
A fourth step of moving the mandrel blade forward and cutting off the long coil portion protruding from the other end of the mandrel blade .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 taking an example of cutting a magnetron filament coil. In FIG. 1A, reference numeral 11 denotes a mandrel blade, and a spiral groove 12 is formed on the surface of the mandrel blade 11 over the entire length thereof. The ridge 13 located between the adjacent grooves 12 of the mandrel blade 11 is configured to be higher in a part of the region R than the ridge between the other grooves 12. Note that the length (H) from the bottom surface of the spiral groove 12 to the tip of the crest 13 formed higher is longer than the thickness of the wire of the long coil to be cut. Then, the portion of the mountain 13 that is formed high is supported by the holding mechanism 14.

Reference numeral 15 denotes a cutter blade, and a blade 15a is formed at the tip of the cutter blade 15. The cutter blade 15 is configured to advance or retreat toward the tip of the mandrel blade 11, as indicated by arrows Y1 and Y2.

As shown in FIG. 1B, the holding mechanism 14 has, for example, a square opening 14a.
Four inner surfaces forming the portion 4a are in contact with the high ridge 13 of the mandrel blade 11, and support the mandrel blade 11. In this case, the length (H) from the bottom surface of the spiral groove 12 to the tip of the crest 13 formed higher is longer than the thickness of the wire of the long coil to be cut. At this time, the opening 14a of the holding mechanism 14 does not come into contact with the long coil, and no trouble occurs in the operation.

Here, a method of cutting a long coil into a predetermined length using the above-described cutting device will be described with reference to FIG. In FIG. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be partially omitted.

First, the long coil 21 is rotated, and the long coil 21 is wound around the mandrel blade 11 from one end of the mandrel blade 11, for example, the right end in the drawing, using the groove formed in the mandrel blade 11 as a guide. Go out. As the long coil 21 is involved, the tip of the long coil 21 advances from the right side to the left side of the mandrel blade 11. Thereafter, the mandrel blade 11 is made to go beyond the height of the crest 13 and protrude outward from the other end of the mandrel blade 11, for example, the left end in the figure. The length L of the long coil 21 protruding from the end of the mandrel blade 11 is set to be equal to the specified length of the magnetron filament coil. At this time, since the length H (see FIG. 1) from the bottom of the spiral groove to the tip of the crest formed higher is longer than the thickness of the wire of the long coil, the holding mechanism 14 of the long coil 21 Does not hinder entrainment.

Next, the rotation of the long coil 21 is stopped, the cutter blade 15 is moved in the direction of the arrow Y toward the tip of the mandrel blade 11, and the long coil 21 is cut by abutting. Thereby, the long coil having the specified length of the filament coil is cut off.

Next, the subsequent portion of the long coil wound around the mandrel blade 11 is wound while being rotated from one end of the mandrel blade 11.

By repeating the above steps, a magnetron filament coil cut to a specified length can be obtained.

According to the above configuration, the mandrel blade is held at the end near the cut portion, for example, by utilizing the high peak portion. For this reason, when cutting the long coil, a sufficient holding rigidity can be secured without bending the distal end portion. Therefore, cutting can be performed cold, the cutting cycle time is shortened, and productivity is improved.

The cutting operation can be performed by feeding a long coil from one direction of the mandrel blade. For this reason, the coil removal process required by the conventional technology,
For example, there is no need to rotate the mandrel blade in the reverse direction, and continuous cutting can be performed. Further, since the long portion of the long coil is held along the groove of the mandrel blade, the cutting operation can be stably performed. Further, by changing the rotation direction of the long coil, the position of the long coil on the mandrel blade can be easily adjusted, and correct positioning of the long coil becomes easy. In addition, since the high peak portion is located above the long coil, the cutting position of the long coil can be determined using the high peak portion as a guide.

In the above-described embodiment, the case where one peak is formed higher than the peak between the other grooves is described. However, it is also possible to provide a mountain portion formed higher than other portions in a plurality of regions separated by a certain distance. In this case, a higher holding rigidity can be ensured by holding the higher ridge portions provided in the plurality of regions by the holding mechanisms.

In the above embodiment, the cutting of the magnetron filament coil is described as an example. However, the present invention is also applicable to cutting filament coils other than magnetrons.

[0026]

According to the present invention, a filament coil cutting device and a cutting method with high productivity can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic structural diagram for explaining an embodiment of the present invention.

FIG. 2 is a schematic structural diagram for explaining the operation of the embodiment of the present invention.

FIG. 3 is a schematic structural diagram for explaining a conventional example.

FIG. 4 is a schematic structural diagram for explaining the operation of the conventional example.

[Explanation of symbols]

 Reference Signs List 11: Mandrel blade 12: Groove formed in mandrel blade 13: Mountain formed in mandrel blade 14: Holding mechanism 14a: Opening of holding mechanism 15: Cutter blade 15a: Blade of cutter blade R: Edge of raised mountain region

Claims (6)

(57) [Claims] 1. A long coil is wound from one end by rotation.
A mandrel blade in which a spiral groove to be inserted is formed on the surface, and a part of a ridge located between the adjacent grooves is formed higher than other parts; A holding mechanism for holding the crest portion, and a forward movement toward the other end of the mandrel blade.
And retreats from the tip of the mandrel blade, and
A cutting device for a filament coil, comprising: a cutter blade for cutting the long coil protruding from the tip of the drell blade . 2. The filament coil cutting device according to claim 1, wherein the spiral groove is formed over the entire length of the mandrel blade in the longitudinal direction. 3. The filament coil cutting device according to claim 1, wherein the length from the bottom surface of the spiral groove to the tip of the high mountain is longer than the thickness of the wire of the long coil. 4. The filament coil cutting device according to claim 1, wherein the raised ridge is closer to the end of the mandrel blade than to the center. 5. A mandrel blade having a spiral groove formed on a surface thereof and a part of a ridge located between adjacent grooves being formed higher than other parts. A first step of holding the crest portion, and winding the mandrel blade from one end side while rotating a long coil with the spiral groove serving as a guide;
A second step of causing a part of the long coil to protrude from the other end of the second coil, a third step of stopping the rotation of the long coil, and setting a cutter blade on the other end side of the mandrel blade. Toward the tip
Move forward and protrude from the other end of the mandrel blade
And a fourth step of cutting off the long coil portion. 6. A mandrel blade having a spiral groove formed on a surface thereof, and a part of a ridge located between adjacent grooves is formed higher than another part. a first step of holding a portion of the mountain, seen write winding with a long coil with a spiral of the groove in the guide is rotated from the side of one end of the mandrel edge, said mandrel blade
A second step of causing a part of the long coil to protrude from the other end of the second coil, a third step of stopping the rotation of the long coil, and setting a cutter blade on the other end side of the mandrel blade. Toward the tip
Move forward and protrude from the other end of the mandrel blade
A fourth step of separating the portion of the long coil that is present, and a fifth step of, after this fourth step, rotating the subsequent portion of the long coil wound on the mandrel blade while rotating the subsequent portion from one end of the mandrel blade. And a method for cutting a filament coil.