JPH06295817A - Plunger - Google Patents

Abstract

PURPOSE:To provide a plunger in which the work time is shortened at the time of resin molding while enhancing the workability. CONSTITUTION:In a plunger composed of a coil bobbin 13, a coil 14, and a yoke 12 and in which a resin 22 is poured between the yoke 12 and the coil bobbin 13 applied with the coil, the diameter W2 of a second flange 16 is set smaller than the diameter W1 of a first flange 15 (w1>w2). The second flange is disposed on the open end side of the yoke and the coil 14 is wound while being tapered between the first and second flanges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger in which a coil bobbin wound with a coil, a yoke, and a movable portion are housed, and the coil bobbin wound with the coil is housed in the yoke and a resin is cast. This plunger is used, for example, as a part of a feeder (thread feed mechanism) of an automatic loom.

[0002]

8 to 10 are explanatory views of the prior art. In FIGS. 8 to 10, 1 is a spool, 2 is a thread adjuster, 3 is a thread feeder, 4 is a plunger, and 5 is fixed. Side thread retainer, 6
Is a movable side thread pressing portion, 7 is a thread, 8 is a cutter, 10 is a mount, 11 is a movable portion, 12 is a yoke, 13 is a coil bobbin, 14 is a coil, 15 is a first bobbin, and 16 is a second bobbin. , 18 is a bearing, 19 is a movable magnet, 20
Is a fixed side magnet, 21 is a needle (needle for casting a dispenser), and 22 is a resin.

§1: Schematic description of feeder in automatic loom ... see FIG. 8 FIG. 8A is an explanatory view of a feeder (thread feeding mechanism) in the automatic loom, and FIG. 8B is an explanatory diagram at the time of thread feeding control.

Conventionally, various plungers have been used in a feeder of an automatic loom to control the yarn feeding. Below is an overview of the feeder using the plunger.
It will be described with reference to FIG.

As shown in FIG. 8A, the feeder is provided with a bobbin 1, a thread adjuster 2, a thread feeder 3, a plunger 4, a fixed side thread retainer 5, a movable side thread retainer 6, and the like.
In this case, the movable side yarn pressing portion 6 is coupled to the plunger 4 and is driven in the vertical direction in the figure by the control of the plunger.

At the time of thread feeding control, the thread 7 wound around the thread winding 1 is pulled out, and the thread adjusting device 2 accumulates a thread having a constant length. After that, by sending air (compressed air) to the yarn feeder 3, the yarn accumulated in the yarn adjuster 2 is fed in the direction of the arrow in the figure by the force of air.

In this case, the yarn 7 passes between the fixed-side yarn pressing portion 5 and the movable-side yarn pressing portion 6 and is fed. By repeating such control, the yarn 7 is sent to the next stage mechanism of the automatic loom.

During the above-mentioned yarn feeding control, the plunger 4 is controlled to press or release the yarn 7, and the control at this time is performed in the order of (1) to (8) shown in FIG. 8B. In this state, a current is applied to the plunger 4 to turn it on, and the movable-side thread pressing portion 6 is attracted downward (in the direction of the arrow) in the figure.

In this state, the movable-side thread pressing portion 6 is separated from the inter-fixed-side thread pressing portion 5 so that the thread can be fed.
The state is the state in which the yarn 7 is fed.

In the state of (1), after the yarn 7 is fed for a certain length, the current flowing through the plunger 4 is stopped and turned off, and the movable side yarn pressing portion 6 is pushed upward in the drawing (in the direction of the arrow). It is in a state of being.

In this state, the movable side yarn pressing portion 6 is pressed against the inter-fixed side yarn pressing portion 5 side and holds the yarn 7. In this state, the plunger 4 is kept in an off state without passing an electric current, the movable side thread holding portion 6 and the fixed side thread holding portion 5 hold the thread 7 and the cutter 8 The thread 7 is cut at a predetermined position.

In the state of, after the thread 7 is cut, the plunger 4
It is a state in which a current is passed through the switch to turn it on, and the movable-side yarn pressing portion 6 is attracted to the lower side of the drawing (direction of the arrow). In this state, the movable-side yarn pressing portion 6 is separated from the inter-fixed-side yarn pressing portion 5 and is in the yarn feeding enabled state (the same as the state).

Thereafter, the yarn feeding control is performed by repeatedly controlling the above-mentioned conditions (1) to (3). §2: Description of Plunger--See FIG. 9 FIG. 9A is a sectional view of the plunger, and FIG. 9B is a plan view of the mounting base. Hereinafter, an example of the plunger used in the feeder will be described.

In this example, the plunger 4 is composed of a mounting base 10, a movable portion 11, a yoke 12, a coil bobbin 13, a coil 14 and the like. And the coil bobbin 13 is
2 consisting of a first flange 15 and a second flange 16 at both ends
It has three flanges, and a coil 14 is wound between the first and second flanges.

Further, the yoke 12 is a bottomed cylindrical yoke having one end opened and a coil bobbin 13 having a coil wound therein can be housed (a yoke also serving as a case). .

The movable part (comprising an iron core, a shaft, etc.)
The movable side magnet 19 is provided at 11, and the movable side magnet 19 is fixed to the fixed side magnet 20.
, And they are arranged so as to repel each other.

The plunger 4 is movable when the coil 14 is not energized (OFF state).
9 and the fixed magnet 20 repel each other, and the movable portion 11
Moves in the M direction in the figure.

When a current is applied to the coil 14 (ON state), the movable part 11 is attracted (the iron core of the movable part is attracted into the coil bobbin) and moves in the N direction in the figure. In this way, the current flowing through the coil 14 is controlled (on / off)
By doing so, the movable portion 11 can be moved in the M and N directions in the figure.

The movable side yarn pressing portion 6 shown in FIG. 8 is fixed to the tip of the movable portion 11, and the operation shown in FIG. 8 is performed by moving the movable portion 11. §3: Description of Plunger Manufacturing ... See FIG. 10 FIG. 10A is an explanatory view of resin casting, and FIG. 10B is an explanatory view after resin casting. Note that, in FIG. 10, the mounting base 10, the movable portion 11, and the like that form the plunger are not shown.

During manufacture of the plunger, the coil 14
The coil bobbin 13 wound around the coil bobbin 13 is put inside the yoke 12 to fix them. In this case, the coil bobbin 13
Then, a resin 22 is cast between the yoke 12 (gap).

When casting the resin 22, first, as shown in FIG.
As shown in A, the coil bobbin 13 around which the coil 14 is wound is placed inside the yoke 12 for positioning. In this case, the distance (spacing) G0 formed between the coil bobbin 13 and the yoke 12 (the same applies between the yoke and the coil) is substantially constant between the first and second brims.

After that, the resin is cast using a casting dispenser. At this time, the tip portion of the casting needle 21 provided in the dispenser is inserted from between the yoke 12 and the second collar 16 of the coil bobbin (gap), and air (compressed air) is sent to the dispenser. The resin is discharged from the tip of and the casting is performed.

In this way, between the yoke and the bobbin,
The resin 22 is cast. In the state after casting, as shown in FIG. 10B, the resin 22 is cast between the yoke 12 and the coil bobbin 13 around which the coil 14 is wound, and both are integrated.

[0024]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. : Resin is cast between the yoke and the coil bobbin around which the coil is wound, but there is a distance (interval) G0 between the yoke and the bobbin (or between the yoke and the coil).

If this distance G0 is large, the amount of resin increases, and the heat dissipation performance deteriorates. Therefore, it is necessary to make the distance G0 as small as possible. Therefore, usually, the distance G0 is made as small as possible to reduce the amount of resin and improve the heat dissipation performance.

However, the smaller the distance G0, the smaller the space for inserting the needle of the dispenser. As a result, the casting work must be performed by using a thin needle as the casting needle, which increases the casting time.

The amount of the cast resin is difficult to confirm during the casting operation (the visual confirmation is difficult) only by reducing the distance G0. Therefore, workability at the time of casting becomes poor. In addition, since it is difficult to confirm the amount of resin, the amount of resin cast may vary.

If the distance G0 is increased in order to improve the workability during casting, not only the amount of resin increases, the heat dissipation deteriorates, but also the plunger becomes large. An object of the present invention is to solve such conventional problems, shorten the working time at the time of resin casting, improve the casting workability, and realize a small-sized plunger with good heat dissipation performance. And

[0029]

FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, the same parts as those in FIGS. 8 to 10 are designated by the same reference numerals. Further, 27 indicates a third brim.

In order to solve the above problems, the present invention has the following configuration. : A coil bobbin 13 having a first flange 15 and a second flange 16 at both ends, a coil 14 wound around the coil bobbin 13, and a coil bobbin 13 around which the coil 14 is wound can be stored, and one end is open. The end yoke 12
In the plunger in which the resin 22 is cast between the yoke 12 and the coil bobbin 13 around which the coil 14 is wound, the diameter (W2) of the second flange 16 is set to that of the first flange 15. Set smaller than the diameter (W1) (W1> W2),
The second flange 16 is arranged on the open end side of the yoke 12.

In the plunger having the structure, the coil 14 is wound in a tapered shape between the first flange 15 and the second flange 16. And a yoke 12 having a coil bobbin 13 wound with a coil and a coil bobbin 13 having the coil wound therein and having an open end at one end.
Between the coil bobbin 13 and the coil bobbin 13
In the plunger cast with 2, the coil bobbin 1
The first flange 15 and the second flange 16 are provided at both ends of the third flange 3, and the third flange 2 is provided between the first flange 15 and the second flange 16.
7 is provided, the coil is divided and wound between the collars, and the second coil 16 is wound between the second collar 16 and the third collar 27.
The winding diameter (K2) of the coil 14-2 of the first flange 15
And the first coil 14-1 wound between the third flange 27 and
Is smaller than the winding diameter (K1) (K2 <K1), the second flange 16 is arranged on the open end side of the yoke 12, and a plurality of recesses 28 or I made a hole.

In the configured plunger, the distance (H2) between the second flange 16 and the third flange 27 is set to the first
It was set to be smaller than the distance (H1) between the flange 15 and the third flange 27 (H1> H2).

In the configured plunger, the winding diameter (K2) of the second coil 14-2 is set to the second flange 16 described above.
The diameter (K2 ≦ X) is set within the inner diameter (X) of the plurality of recesses 28 or holes provided in the.

[0034]

The operation of the present invention based on the above configuration will be described with reference to FIG. When performing resin casting on the plunger shown in FIG. 1A, the tip of the casting needle 21 is inserted between the second collar 16 of the coil bobbin 13 and the yoke 12. To do. Then, the resin 22 is cast between the yoke 12 and the coil bobbin 13 around which the coil 14 is wound.

In this case, the diameter W2 of the second collar 16 is set to the first
Since the diameter is set smaller than the diameter W1 of the collar 15 (W1> W2), the distance G1 between the first collar 15 and the inside of the yoke 12 is G1.
And the distance G2 between the second collar 16 and the inside of the yoke 12 has a relationship of G2> G1.

Therefore, during the casting operation, the casting needle 21
Since the space (distance G2) for inserting is large,
The resin can be cast in a short time using a thick needle (a needle with a large diameter).

Further, since the cast resin can be visually observed during the casting operation (because the distance G2 is large), it is possible to visually check the amount of the resin and perform the casting operation without variation. Therefore, the workability during casting can be improved.

Furthermore, since the distance G1 can be made extremely small, the amount of resin is reduced as a whole,
A plunger with good heat dissipation characteristics can be realized. : When resin is cast on the plunger shown in FIG. 1B, the recess 28 provided in the second collar 16 of the coil bobbin 13 is used to provide a space between the second collar 16 and the yoke 12. The tip of the needle 21 for casting is inserted, and the resin is discharged from the tip of the needle 21.

In this way, the yoke 12 and the coil 1 are
The resin 22 is cast between the coil bobbin 13 and the coil bobbin 13. In this case, since the second flange 16 is provided with a plurality of recesses 28 or holes, if the needles 21 are inserted using the recesses 28 or holes, the needle 21 that is thicker than that of the conventional example can be obtained.
Can be used. Therefore, the resin can be cast in a short time.

Further, if the concave portion 28 or the hole is utilized, it is possible to perform the work while visually confirming the amount of the resin sufficiently at the time of casting. Therefore, the amount of resin can be made constant and workability is improved.

As described above, it is possible to shorten the working time at the time of casting the resin, improve the workability at the time of casting, and manufacture a compact plunger having a good heat radiation performance.

[0042]

Embodiments of the present invention will be described below with reference to the drawings. (Explanation of the First Embodiment) FIGS. 2 and 3 are explanatory views of the first embodiment of the present invention, and FIGS. 1 and 8 to 10 in FIGS.
The same parts as those are indicated by the same reference numerals. Further, 24 is an air compressor, 25 is a pipe, and 26 is a resin container.

The first embodiment is an example in which the diameters of the first flange 15 and the second flange 16 of the coil bobbin 13 constituting the plunger are different. The details will be described below with reference to FIGS. 2 and 3. 2 and 3, the mounting base 10, the movable portion 11 and the like that form the plunger are omitted in the drawings, but these configurations are the same as those in the conventional example.

§1: Description of plunger configuration--FIG. 2
Reference In this example, similar to the conventional plunger described above, a coil bobbin around which a coil is wound is put into a yoke 12 having a bottomed cylindrical body, and resin is cast in the space (gap) between the coil bobbin 13 and the coil bobbin 13 in this case. First tsuba 15 provided at both ends of the
Then, the second brim 16 is made into a circular (planar shape is circular) brim, and its diameter is made different.

As shown in the drawing, when the diameter of the first flange 15 is W1 and the diameter of the second flange 16 is W2 with respect to the first and second flanges provided on the coil bobbin 13, W1> W
Set the size of the tsuba based on the relationship of 2.

The first collar 1 of this coil bobbin 13
A coil 14 is wound in a taper shape between the coil 5 and the second flange 16. In addition, to wind the coil in a taper shape, for example,
Winding can be done easily by using a computer-controlled (numerical control) winding machine.

The first flange 15 is positioned on the bottom side of the yoke 12 and the second flange 16 is positioned on the open end side of the yoke 12. In this case, if the distance between the first flange 15 and the inside of the yoke 12 is G1, and the distance between the second flange 16 and the inside of the yoke 12 is G2, the relationship of G2> G1 is established.

That is, the distance between the collar of the coil bobbin and the inside of the yoke is narrow on the bottom side of the yoke and large on the open end side. When the resin is cast in this way,
A plunger as shown in B is obtained. As shown in the figure, in the completed plunger, a resin 22 is cast between the coil bobbin 13 around which the coil 14 is wound and the yoke 12, and the resin 22 integrates the two.

§2: Description of Manufacturing Plunger--See FIG. 3 When manufacturing the plunger having the above-described structure, as in the conventional example,
The resin is cast, and the work during this casting will be described.

A dispenser is used at the time of casting the resin. The dispenser is composed of, for example, an air compressor 24, a resin container 26, a pipe 25, a casting needle 21 and the like.

The resin used for casting is put in the resin container 26 and the inside thereof is hermetically sealed. Further, the resin container 26 is configured so that air (compressed air) can be sent from the air compressor 24 via the pipe 25.

At the time of casting, the tip of the casting needle 21 is inserted between the second collar 16 of the coil bobbin 13 and the yoke 12, and the air (compressed air) from the air compressor 24 is supplied. It is sent to the resin container 26 via the pipe 25.

At this time, the pressure of the air sent to the resin container 26 causes the resin in the resin container 26 to be discharged from the tip of the needle 21 to the outside. In this way, the yoke 12 and
The resin 22 is provided between the coil bobbin 13 around which the coil 14 is wound.
Cast.

In this case, as described above, the distances G1 and G2 are
Is set to have a relationship of G1 <G2, so that it is possible to use a thicker needle (having a larger diameter) 21 as compared with the conventional example. Therefore, the resin can be cast in a short time.

Further, since there is a relation of G1 <G2 (the space on the open end side is large), it is possible to perform the work while visually confirming the resin 22 sufficiently at the time of casting. Therefore, the amount of resin can be made constant and workability is improved.

(Explanation of the Second Embodiment) FIGS. 4 and 5 are explanatory views of the second embodiment of the present invention, and FIGS.
The same parts as those in FIG. 3 and FIGS. 8 to 10 are denoted by the same reference numerals.

4 and 5, the mounting base 10, the movable portion 11 and the like which form the plunger are not shown, but the construction thereof is the same as that of the conventional example. The second embodiment is an example in which three flanges are provided on a coil bobbin, coils having different winding diameters are dispersedly wound between the flanges, and recesses are provided on the outer flange. The details will be described below.

§1: Description of Plunger Configuration--See FIGS. 4 and 5A. FIG. 4A is an explanatory view of the plunger, and FIG. 4B is a plan view of the second flange. Further, FIG. 5A is a diagram showing the plunger after resin casting.

In the second embodiment, the coil bobbin 13 is provided with three flanges including a first flange 15, a second flange 16 and a third flange 27. In this case, the first flange 15, the second flange 16, and the third flange 27 each have a circular planar shape and the same diameter.

Further, the third flange 27 includes the first flange 15 and
It is provided between the second flange 16. In this case, the first tsuba 15
And the distance between the third tsuba 27 and H1, and the third tsuba 2
If the distance between 7 and the second flange 16 is H2, H1>
Set to the relationship of H2.

Further, the first coil 14-1 is wound between the first flange 15 and the third flange 27, and the third flange 27 and the second flange 27 are formed.
A second coil 14-2 is wound between the collar 16 and the. In this case, the winding diameter of the first coil (outer diameter of the coil) is set to K1.
And the winding diameter of the second coil 14-2 (outer diameter of the coil)
Let K2 be K2>K1> K2.

The diameters of the collars 15, 16 and 27 are all the same and are substantially equal to the winding diameter K1 of the first coil. A plurality of recesses 28 are provided in the second flange 16 (a flange on the open end side of the yoke). This recess 28 is
This is for facilitating insertion of a casting needle, and any number of recesses of arbitrary shape may be provided.

However, as shown in FIG. 4B, when the inner diameter of the plurality of recesses 28 (for example, the diameter of a virtual circle connecting the inner sides of the recesses 28) is X, the second coil 14-2 has Between the winding diameter (coil outer diameter) K2 and X, K2 ≦ X
The sizes (X and K2) of each part are set so that the relationship of

When a resin is cast into the plunger constructed as described above, a plunger as shown in FIG. 5A is obtained. In the completed plunger, a resin 22 is cast between the coil 12 and the coil bobbin 13 around which the first coil 14-1 and the second coil 14-2 are wound, and the resin 22 causes the Are integrated.

§2: Description of Plunger Manufacturing ... See FIG. 5B FIG. 5B is an explanatory view of resin casting. At the time of manufacturing the plunger having the above structure, the resin is cast by the dispenser in the same manner as in the first embodiment.

During the casting operation, the tip end portion of the casting needle 21 is provided in the recess 28 provided in the second collar 16 of the coil bobbin 13.
The resin is discharged from the tip of the needle 21 by inserting the needle 21 between the needle 21 and the yoke 12.

In this way, the yoke 12 and the coil 1 are
The resin 22 is cast between the coil bobbin 13 and the coil bobbin 13. In this case, since the second collar 16 is provided with a plurality of recesses 28, it is possible to use a thicker needle 21 (having a larger diameter) as compared with the conventional example by using the recesses 28. Is. Therefore, the resin can be cast in a short time.

If the concave portion 28 is used, when casting,
It is possible to perform the work while visually confirming the resin 22 sufficiently. Therefore, the amount of resin can be made constant and workability is improved.

(Explanation of Third Embodiment) FIGS. 6 and 7 are explanatory views of a third embodiment of the present invention, wherein FIGS.
5 and 8 to 10 are the same as those shown in FIG.

6 and 7, the mounting base 10, the movable portion 11 and the like which compose the plunger are omitted in the drawings, but the construction thereof is the same as that of the conventional example. The third embodiment is a partial modification of the second embodiment, and instead of providing the recess, the diameter of the second collar 16 is set to the second coil 14-2.
This is an example in which the size is approximately the same as the diameter of. The details will be described below.

§1: Description of Plunger Configuration--See FIGS. 4 and 5A. FIG. 6A is an explanatory view of the plunger, and FIG. 6B is a view of the coil bobbin as seen from above. Further, FIG. 7A is a diagram showing the plunger after resin casting.

In the third embodiment, similar to the second embodiment, the coil bobbin 13 is provided with a first collar 15 and a second collar 16.
Three tsuba consisting of the third tsuba 27 are provided, but the second tsuba 1
The diameter of 6 is set to be substantially the same as the outer diameter of the second coil 14-2.

That is, similarly to the second embodiment, if the winding diameter of the first coil (outer diameter of the coil) is K1, and the winding diameter of the second coil 14-2 (outer diameter of the coil) is K2. ,
Set to the relationship of K1> K2.

The diameters of the first flange 15 and the third flange 27 are set to be substantially the same as the winding diameter K1 of the first coil 14-1, and the diameter of the second flange 16 is set to the first diameter. The diameter is set to be approximately the same as the winding diameter K2 of the second coil 14-2. In addition, other configurations are
Since it is the same as that of the second embodiment, its explanation is omitted.

When a resin is cast into the plunger constructed as described above, a plunger as shown in FIG. 7A is obtained. As shown in the figure, in the completed plunger, the resin 22 is cast between the coil bobbin 13 around which the first coil 14-1 and the second coil 14-2 are wound, and the yoke 12. Both are integrated by the resin 22.

§2: Description of Plunger Manufacturing ... See FIG. 5B. FIG. 7B is an explanatory diagram of resin casting. At the time of manufacturing the plunger having the above structure, the resin is cast by the dispenser in the same manner as in the first embodiment.

During the casting operation, the tip of the needle 21 for casting is inserted between the second collar 16 of the coil bobbin 13 and the yoke 12, and the resin is discharged from the tip of the needle 21. . In this way, the resin 22 is cast between the yoke 12 and the coil bobbin 13 around which the first and second coils 14-1 and 14-2 are wound.

In this case, the winding diameter K2 of the second coil 14-2 is made smaller than the winding diameter K1 of the first coil, and the diameter (approximately K2) of the second collar 16 is the first and the third. Tsuba 1
Since the diameter is set to be smaller than the diameters of 5 and 27 (approximately K1), the space for inserting the needle 21 can be widened.

Therefore, as compared with the conventional example, it is possible to use the thick needle 21 (having a large diameter), so that the resin can be cast in a short time. In addition, the second collar 16 and the yoke 12
Since the distance between and is wide, it is possible to perform the work while visually confirming the amount of the resin 22 sufficiently at the time of casting. Therefore, the amount of resin can be made constant and workability is improved.

(Other Embodiments) The embodiments have been described above, but the present invention can be implemented as follows. : Plungers are not limited to those for automatic loom,
It can be used for any other purpose.

The number and shape of the recesses 28 of the second embodiment are arbitrary. For example, a rectangular recess may be used. Further, the recess may be formed by a notch having an arbitrary shape. : The shape of the yoke matches the shape of the coil bobbin,
Any shape is acceptable. For example, the collar of the coil bobbin may be rectangular and the yoke may be prismatic with a bottom.

: Instead of the recess 28 shown in FIG. 4B,
A hole having an arbitrary shape such as a round hole, a square hole, or an elongated hole may be provided.

[0083]

As described above, the present invention has the following effects. : Even if the distance (interval) between the coil bobbin around which the coil is wound and the yoke is shortened, the needle insertion space can be widened, so a thicker needle can be used for the resin casting needle compared to the conventional example. . Therefore, the resin casting operation can be performed in a short time.

Since the space on the open end side of the yoke is large, it is possible to perform the work while visually confirming the resin when casting. Therefore, workability at the time of casting is also improved, and the amount of resin can be made constant without variation. As a result, variations in heat dissipation characteristics can be reduced and product quality can be improved.

Even if the distance (interval) between the coil bobbin around which the coil is wound and the yoke is shortened, the space for inserting the needle can be widened, so that the workability of casting the resin is improved and the amount of the resin is minimized. It is possible to keep it to the limit.

Therefore, it is possible to realize a small-sized plunger having excellent heat dissipation characteristics.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram of the first embodiment (A is an explanatory diagram of a plunger, B is a diagram showing a plunger after resin casting).

FIG. 3 is an explanatory view of the first embodiment (an explanatory view at the time of resin casting).

FIG. 4 is an explanatory view of a second embodiment (A is an explanatory view of a plunger, B is a plan view of a second flange).

FIG. 5 is an explanatory diagram of a second embodiment (A diagram showing a plunger after resin casting, B is an explanatory diagram at the time of resin casting).

FIG. 6 is an explanatory view of a third embodiment (A is an explanatory view of a plunger, B is a view of a coil bobbin as seen from above).

7A and 7B are explanatory views of a third embodiment (A is a diagram showing a plunger after resin casting, and B is an explanatory diagram at the time of resin casting).

FIG. 8 is an explanatory diagram of a conventional technique (A is an explanatory diagram of a feeder, B is an explanatory diagram of a feeder).
Is an explanatory view at the time of thread feeding control).

FIG. 9 is an explanatory view of a conventional technique (A is a sectional view of a plunger,
B is a plan view of the mounting base).

FIG. 10 is an explanatory diagram of a conventional technique (A is an explanatory diagram at the time of resin casting, B is an explanatory diagram after resin casting).

[Explanation of symbols]

 12 yoke 13 coil bobbin 14 coil 14-1 first coil 14-2 second coil 15 first flange 16 second flange 21 needle (casting needle) 22 resin 27 third flange 28 recess

Claims (5)

[Claims] 1. A coil bobbin (13) having a first collar (15) and a second collar (16) at both ends, a coil (14) wound around the coil bobbin (13), and the coil (14). ), A coil bobbin (13) can be stored, and one end of the yoke (1) is an open end.
2), the plunger in which the resin (22) is cast between the yoke (12) and the coil bobbin (13) around which the coil (14) is wound, the second flange (16) Set the diameter (W2) to the first brim (1
Set smaller than the diameter (W1) of 5) (W1> W2),
A plunger characterized in that the second brim (16) is arranged on the open end side of the yoke (12). 2. The coil (14) is provided with a first collar (1).
The plunger according to claim 1, wherein the plunger is wound between the second flange (16) and the second flange (5) in a tapered shape. 3. A coil bobbin wound with a coil (13)
And a yoke (12) capable of accommodating the coil bobbin (13) wound with the coil and having an open end at one end, the yoke (12) and the coil bobbin (1) wound with the coil.
3), in the plunger in which the resin (22) is cast, the first collar (1) is attached to both ends of the coil bobbin (13).
5) and the second collar (16) are provided, and the first collar (1
5) and the second tsuba (16), the third tsuba (27) is provided, the above-mentioned coil is divided and wound between each tsuba, and the second tsuba (16) and the third tsuba (3). The winding diameter (K2) of the second coil (14-2) wound between the first flange (15) and the third flange (27) was wound between the first flange (15) and the third flange (27). The winding diameter (K1) of the first coil (14-1) is set smaller (K2 <K1), the second flange (16) is arranged on the open end side of the yoke (12), and Plunger (28) or hole is provided in the outer peripheral portion of the collar (16). 4. The second collar (16) and the third collar (2).
7) to the distance (H2) between the first flange (15) and the third flange (27) (H).
4. The plunger according to claim 3, wherein the plunger is set smaller than (1) (H1> H2). 5. The winding diameter (K2) of the second coil (14-2) is within the inner diameter (X) of the plurality of recesses (28) or holes provided in the second flange (16). 4. The plunger according to claim 3, wherein the diameter (K2 ≦ X) is set.