JPH0974040A - Method for forming coil, coil base, and coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the trouble for forming a coil and to reduce its cost by pinching a conductor which is wound in pancake shape by a plurality of pinching parts which project at a coil base and supporting the coil at the coil base with one touch. SOLUTION: Pinching parts 20b, 20h, and 20n of a coil base 1 are allowed to oppose conductors W, W, W located in whirl grooves 30, 30, 30 where the winding position of a conductor retaining tool 3 differs. By pressing the coil base 1 to the conductor retaining tool 3, the conductors W, W, W are pressed against the pinching parts 20b, 20h, and 20n, the area between opposing pinching pieces 20, 20 of the pinching parts 20b, 20h, and 20n is spread by the conductors W, W, W, the conductors W, W, W pass between the opposing pinching pieces 20, 20 and are engaged to the base part side of the pinching parts 20b, 20h, and 20n. After the engagement, the area between the opposing pinching pieces 20, 20 returns to the original state and the pinching parts 20b, 20h, 20n pinch each of the conductors W, W, W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a pancake-shaped coil, a coil base and a coil.

[0002]

2. Description of the Related Art In an induction heating rice cooker that induction-heats a rice cooker to cook rice, a pancake-shaped induction heating coil is disposed below the bottom of the rice cooker. This induction heating coil is formed by forming a spiral groove on the surface of a coil base made of a heat resistant material and fitting a conductor into the spiral groove. Such an induction heating coil winding method is disclosed in JP-A-61-77293 and JP-A-61-19.
It is disclosed in Japanese Patent No. 3394.

[0003]

However, in the conventional winding method of the induction heating coil, the conductor is arranged along the circumferential direction in the spiral conductor groove while rotating the coil base supporting the coil. However, there is a problem that it takes time to wind the induction heating coil and the cost of the induction heating coil is high. In view of such a problem, an object of the present invention is to provide a coil forming method, a coil base, and a coil that can easily form a coil without a labor for forming the coil and that can reduce the cost of the coil.

[0004]

According to a first aspect of the present invention, there is provided a coil forming method, wherein a conductor wound in a pancake shape is dropped into a spiral groove of a conductor holder having a spiral groove for holding the conductor. The coil base having a plurality of sandwiching portions projecting on the spiral line having the same pitch as the spiral groove, the sandwiching portion and the conductor in the spiral groove are made to face each other, and the coil base is superposed, and the coil base is held by the conductor holder. It is characterized in that the conductor is sandwiched between the sandwiching portions by pressing the conductor.

In the first aspect of the invention, the conductor wound in a pancake shape is inserted into the spiral groove of the conductor holder to position the conductor. When the sandwiched portion protruding from the coil base is exposed on the positioned conductor and the coil base is pressed toward the conductor holder, the conductor fits in the sandwiched portion and sandwiches the conductor by the sandwiched portion. Form a pancake-like coil on the base. This allows the coil base to support the pancake-shaped conductor with one touch.

A coil base according to a second aspect of the present invention is a coil base for supporting a conductor wound in a pancake shape on a surface thereof, and a plurality of conductors to be wound are to be sandwiched on a spiral line on the surface. It is characterized in that the holding portion is provided so as to project.

In the second aspect of the invention, the plurality of sandwiching portions arranged along the spiral line sandwich the wound conductor. The sandwiched conductor forms a pancake-shaped coil.
Thereby, the wound conductor can be easily supported by the coil base.

In the coil according to the third aspect of the present invention, in a coil composed of a wound conductor and a coil base supporting the conductor, the conductor should be held on the spiral line on the surface of the coil base. It is characterized in that a plurality of holding portions are provided so as to project, and the holding portion holds the conductor.

In the third aspect of the invention, the pancake-shaped coil is formed on the coil base by sandwiching the pancake-shaped conductor by the plurality of sandwiching portions arranged along the spiral line. This makes it possible to easily form a pancake-shaped coil and reduce the cost of the coil.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings showing the embodiments thereof. FIG. 1 is a plan view of a coil base for supporting a coil used for carrying out a coil forming method according to the present invention. The coil base 1 is formed in substantially the same size as the outer diameter of the bottom of the induction cooked rice cooker, and is made of polyethylene terephthalate resin or ceramic. On one side of the coil base 1,
Clamping portions 2a, 2b, 2c, 2d ... 2n, which will be described later, for clamping the conductors of the coil are projected at appropriate positions on the spiral line L concentric with the coil base 1 and shown by the one-dot chain line. Then, the holding portions 2a to 2f hold the first-turn conductor portion from the outer peripheral side of the spiral wire L, and the holding portions 2g to 2j hold the second-turn conductor portion from the outer peripheral side. The sandwiching portions 2k to 2m are arranged to sandwich the conductor portion of the third turn from the outer peripheral side. The sandwiching portion 2a is arranged in a direction substantially orthogonal to the orientation of the sandwiching portions 2b, 2c ... 2n so as to sandwich the end portion side of the conductor of the first turn from the outer peripheral side.

FIG. 2 is a sectional view taken along line II of FIG. As shown in FIG. 2, each of the sandwiching portions 2b, 2h, 2n is flexible and has a bending portion of two sandwiching pieces 20, 20 which are bent in a V shape in a side view. It is formed so that the same surfaces face each other. The cross-sectional shape between the sandwiching portions on the base side of the bent portions of the sandwiching pieces 20, 20 is formed into a substantially circular shape, and is selected to have a cross-sectional area slightly larger than the cross-sectional area of the conductor to be sandwiched. As a result, when the front ends of the sandwiching pieces 20, 20 are pressed against the conductor, the space between the sandwiching pieces 20, 20 is opened and the conductor passes through the bent portion of the sandwiching piece 20, 20. The holding pieces 20 and 20 are fitted into the inside of the base portion of the holding body to hold the conductor. Near the outer periphery of the coil base 1, pin holes H ₁ and H ₂ having _one with a large diameter and the other with a small diameter are opened at symmetrical positions, and the pin hole H ₁ is located on the right side.

FIG. 3 is a plan view of a conductor holder used for carrying out the coil forming method according to the present invention. Conductor holder 3
Is substantially the same in size and shape as the coil base 1, and is formed of an iron disc having an appropriate thickness. On one side of the conductor holder 3, the holding portions 2a, 2b ... 2n arranged on the coil base 1 are provided.
A spiral groove 30 having a predetermined width dimension and a V-shaped cross section is formed on the spiral line having the same pitch as the spiral line L indicated by the one-dot chain line passing through the central portion of ing.

The innermost peripheral end of the spiral groove 30 has a conductor holder 3
Is formed along the radial direction of, and is formed in the same manner as the spiral groove 30, and is connected to the straight groove 31 that intersects with the spiral groove 30. The outermost peripheral end of the spiral groove 30 is a conductor holder 3
And is connected to a short linear groove 32 that is formed along the radial direction and has the same width dimension as the spiral groove 30. Straight groove
31, 32 are formed substantially parallel to each other. Conductor holder 3
One of the pin holes H ₁ , H has a large diameter and the other has a small diameter near the outer periphery of the surface on which the spiral groove 30 is formed.
Pins P ₁ and P ₂ capable of fitting with ₂ are projected at symmetrical positions, and the pin P ₁ is located on the left side. Thus, the pin P ₁ into the pin hole H _1, by inserting the pin P ₂ into the pin holes H _2, in the case where the polymerization of the coil base 1 on the conductor holder 3, spiral grooves of the conductor holder 3 Positioning can be performed so that 30 and the spiral line L shown by the one-dot chain line in FIG. 1 face each other.

FIG. 4 is a sectional view taken along line III-III in FIG. As shown in FIG. 4, the above-mentioned spiral groove 30 has a V-shaped cross-section, and the conductor can be positioned in a spiral shape by dropping the wound conductor into the spiral groove 30. ing.

Next, a method of forming a coil using the coil base and the conductor holder configured as described above will be described.
FIG. 5 is a perspective view of the forming process showing the process of forming the coil. First, as shown in FIG. 5 (a), a coil supporting disk 10 that is rotatably driven is penetrated to form a coil supporting disk 10 on the outer peripheral side of a rotating shaft 11 that is attached. The tip of the conductor W to be wound is inserted into the conductor hole which is not provided and is guided to the lower surface side of the coil supporting disk 10. And the conductor W
In a state of being extended to an appropriate length, the end portion side is fixed by the conductor fixing tool 12 attached to the lower surface side of the coil supporting disk 10.

Next, as shown in FIG. 5 (b), the coil supporting disk 10 is rotated in the direction of the arrow to wind the conductor W around the rotary shaft 11, and the outer circumference of the wound conductor W is in the same plane. Then, the conductor W is wound to form a pancake-shaped coil. When the conductor W reaches the rotation position close to the conductor fixture 12 side after reaching the predetermined number of turns (3.5 times in FIG. 5), the winding operation of the conductor W is stopped and the conductor W is formed on the tip side. The conductor W is cut at the length position of the lead wire having the same length as the length of the lead wire, as shown in FIG. 5 (c), and the winding operation is completed.

Here, the conductor fixing tool 12 is operated to release the state in which the tip of the conductor W is fixed by the conductor fixing tool 12. Then, by lifting the wound coil and pulling out the tip end side of the conductor through a conductor hole (not shown), the coil can be removed from the coil supporting disk 10 to obtain a pancake-shaped coil. When this pancake-shaped coil is placed on the conductor holder 3, the pancake-shaped coil is released from the tightened state, and the conductor W is formed on the conductor holder 3 as shown in FIG. 5 (d). Along the spiral groove 30
Fall into the bottom.

Here, the leader line A₁, A₂Straight groove 32, 31
Leader A along the line₁, A₂Correcting the orientation of
As shown in 6, the coil conductor W of the pancake coil is
It is positioned by falling into the spiral groove 30 and the straight grooves 31, 32.
It will be in a state of being. Leader line A ₂Is located below the coil
You. Next, the conductor holder in which the conductor W is positioned in this way is
On the upper surface of the holding tool 3, project the holding parts 20, 20, ... Of the coil base 1.
The surfaces to be installed are made to face each other, and the conductor holder 3
Pin P₁, P₂To the pin hole H of the coil base 1. ₁, H₂
When they are fitted so as to face each other, on the line I-I in FIG.
As shown in FIG. 7, the holding portions 20b, 20h, 20 of the coil base 1 are
n is a spiral groove in which the winding position of the conductor holder 3 is different.
Opposes conductors W, W, W located within 30, 30, 30
You. Therefore, push the coil base 1 against the conductor holder 3.
When pressed, the clamping parts 20b, 20h, 20n are pressed against the conductors W, W, W.
Being trained, the sandwiching parts 20b, 20h, 20n are facing each other.
Conductor W is expanded by the conductors W, W, W between the sandwiching pieces 20, 20
W, W, W is a sandwiching portion that passes between the sandwiching pieces 20, 20 facing each other.
Fitted into the base side of 20b, 20h, 20n and fitted
After that, return to the state before the gap between the sandwiching pieces 20, 20 facing each other.
After returning, the sandwiching parts 20b, 20h, 20n connect the conductors W, W, W respectively.
You will be pinching each.

Although FIG. 7 shows the holding portions 20b, 20h, 20n, the other holding portions also hold the conductor in the spiral groove 30. Therefore, the coil bases support the pancake-shaped coil by holding all the holding portions 2a, 2b, ... When the conductor W is thus supported by the coil base 1, the pressing of the coil base 1 is stopped, and the coil base 1 is removed from the conductor holder 3. Then, as shown in FIG. 8, the conductor W is sandwiched by the sandwiching portions 2a, 2b ... 2n, and the spirally wound pancake coil is supported by the coil base 1 to form an induction heating coil.

Thus, the coil can be supported on the coil base with one touch without the need for the conventional troublesome winding work such as fitting the conductor along the circumferential direction into the spiral groove for supporting the conductor. Can be made. Further, an adhesive or the like is not required to fix the coil, and the cost of the coil can be reduced.

In the present embodiment, the number of turns of the conductor is 3.5, but this is merely an example, and the number of turns is not limited to this. Further, the shape of the holding portion is not limited to this. Further, the coil includes an inner peripheral coil portion having a predetermined number of turns and an outer peripheral coil portion having a predetermined number of turns and concentric with the inner peripheral coil portion in a direction of a proper length from the inner peripheral coil portion, and two coils connected in series. It is needless to say that the same can be formed in the case where the portion is provided. Furthermore, a coil other than the induction heating coil can be similarly formed.

[0022]

As described in detail above, according to the first aspect,
The conductor wound in the shape of a pancake can be easily clamped at once by a plurality of clamping portions projecting from the coil base, and the coil can be easily formed, and there is no trouble in forming the coil.
A coil forming method suitable for mass production can be provided.

According to the second aspect of the present invention, it is possible to provide a coil base capable of holding a conductor wound in a pancake shape with one touch.

According to the third aspect of the invention, the conductor wound in the shape of a pancake is sandwiched by the sandwiching portion projecting from the coil base, and the conductor is stably supported. The present invention has excellent effects such as providing a cost coil.

[Brief description of drawings]

FIG. 1 is a plan view of a coil base used in a coil forming method according to the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is a plan view of a conductor holder used in the coil forming method according to the present invention.

FIG. 4 is a sectional view taken along line III-III in FIG.

FIG. 5 is a perspective view of a forming process showing a coil forming process.

FIG. 6 is a plan view of the conductor holder shown together with a wound conductor.

FIG. 7 is a cross-sectional view showing a state in which a coil base and a conductor holder are opposed to each other.

FIG. 8 is a plan view of a coil base in which a coil conductor is sandwiched.

[Explanation of symbols]

 1 Coil base 2a to 2n Clamping part 3 Conductor holder 11 Coil support disk 20 Clamping piece 30 Spiral groove 31, 32 Straight groove W conductor

Claims (3)

[Claims] 1. A conductor wound in a pancake shape is inserted into a spiral groove of a conductor holder having a spiral groove to hold the conductor and positioned, and a plurality of spiral wires are arranged on the spiral line having the same pitch as the spiral groove. Coil base with the sandwiching part of
A method for forming a coil, characterized in that a sandwiching portion and a conductor in a spiral groove are opposed to each other and superposed, and the coil base is pressed against a conductor holder to sandwich the conductor in the sandwiching portion. 2. A coil base for supporting a conductor wound in a pancake shape on the surface thereof, and a plurality of holding portions for holding the wound conductor are projected on the spiral line of the surface. Coil base characterized by being. 3. A coil comprising a wound conductor and a coil base supporting the conductor, wherein a plurality of holding portions for holding the conductor are projected on a spiral line on the surface of the coil base. A coil, characterized in that the conductor is sandwiched between the sandwiching portions.