JPH04239707A - Manufacture of magnet coil - Google Patents

Abstract

PURPOSE:To prevent the wire breaking by giving slack to the winding start and winding end of the magnet wire wound on a coil. CONSTITUTION:A comb-shaped projection 35 is put on the side of the terminal pin 27 of the coil bobbin 24 of a step motor, and a magnet wire 26 is wrapped on the terminal pin 27. This projection 35 is on the level that the top does not project to the side of the barrel. In this condition, the positions of nozzles 32 and 33 are lowered after being put in the position of the barrel, a spindle 31, to which a bobbin 24 is attached, is rotated once. Thereupon, it is wound in the condition that the wire is caught on the projection 35. Then, the nozzles 32 and 33 are raised, and the spindle 31 is rotated to wind the coil. And in the condition that the wire 26 is caught on the projection 35, the terminal is wrapped on the other terminal pin 28. And each terminal pin is soldered and it is removed from the projection 35.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnet coil used, for example, in a claw-pole step motor.

0002

2. Description of the Related Art For example, a so-called claw-pole step motor is used as a motor for moving the carriage of a printer. As is well known, the stator of this type of step motor is constructed by incorporating, for example, two sets (two phases) of magnetic coils wound in the circumferential direction around a core having a wedge-shaped inductor on the inner peripheral surface. A rotor including permanent magnets is disposed inside the stator.

As shown in FIG. 6, the magnet coil 1 is constructed by doubly winding magnet wires 5 and 6 around a plastic bobbin 4 that has flanges 3 and 3 on both sides of a body 2. ing. A holder part 3a is integrally formed on the upper part of one of the flanges 3 of the bobbin 4, and three terminal pins 7, 8, and 9 are erected on this holder part 3a. One end 5a of one magnet wire 5 is connected to the terminal pin 7, the other end 5b of the magnet wire 5 and one end 6a of the other magnet wire 6 are connected to the terminal pin 8, and the terminal pin 9 magnet wire 6
The other end 6b is connected, and these terminal pins 7, 8
, 9, the magnet coil 1 is energized.

In manufacturing the magnet coil 1, the work of winding the magnet wires 5 and 6 around the bobbin 4 is performed using a winding machine 10 as shown in FIG. That is, although not shown in detail, this winding machine 10 is configured to rotate a spindle 11 on which the bobbin 4 is set by a drive mechanism including a motor, and is located above the spindle 11. In this case, a wire supply mechanism is provided which has two wire supply nozzles 12 and 13 movable in the front, back, left and right directions.

The bobbin 4 is set in a non-rotating state with respect to the spindle 11 with the terminal pins 7, 8, 9 facing upward, and in this state, first, the magnet wires 5, 6 supplied from the nozzles 12, 13 are The starting ends 5a, 6a are wound around the terminal pins 7, 8 by rotating the nozzles 12, 13 around the terminal pins 7, 8, respectively. Next, by rotating the spindle 11, the magnet wires 5 and 6 are wound around the body 2 of the bobbin 4 a predetermined number of times. Thereafter, the terminal ends 5b and 6b of the magnet wires 5 and 6 are wound around the terminal pins 8 and 9, respectively, and the magnet wires 5 and 6 are cut to complete the winding operation. After the winding work is completed, the bobbin 4 is attached to the spindle 1.
1, and the terminal pins 7, 8, and 9 are soldered.

[0006]

By the way, in the above manufacturing process, the spindle 11 is rotated at high speed when the magnet wires 5 and 6 are wound around the bobbin 4. The wires 5 and 6 are wound around the bobbin 4 under relatively large tension. Particularly, the portions of the magnet wires 5 and 6 where they start winding around the body 2 immediately after the starting ends 5a and 6a that are entwined with the terminal pins 7 and 8 are under considerable tension.

On the other hand, the step of soldering the magnet wires 5, 6 to the terminal pins 7, 8, 9 is a
, 9 facing downward in a molten solder bath, at this time thermal stress is applied to the winding start and end of the magnet wires 5 and 6 wound around the bobbin 4. . However, as described above, since a large amount of tension is applied to the winding start and winding end portions of the magnet wires 5 and 6, a slight thermal stress often causes the wires to break at those portions.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a method for manufacturing a magnet coil that can reduce the tension acting on the winding start portion or the winding end portion of the magnet wire to prevent wire breakage. is to provide.

[0009]

[Means for Solving the Problems] The method for manufacturing a magnetic coil of the present invention includes providing a protrusion that rotates integrally with the spindle of a winding machine, mounting the coil bobbin on the spindle, and positioning the protrusion on the side of the terminal pin. The magnetic wire is characterized in that the winding start portion and/or winding end portion of the magnet wire on the body portion, or both, are wrapped around the protrusion, and then the protrusion is removed.

0010

[Operation] According to the above method, when starting to wind the magnet wire around the body of the coil bobbin, the winding work is performed after the winding start portion is passed over the protrusion located on the side of the terminal pin. For example, by removing the protrusion after winding of the magnet wire is completed, a slack is created at the beginning of winding of the magnet wire by an amount corresponding to the amount of slack that has been wrapped around the protrusion. Also, when winding ends, if you wrap the end of the magnet wire around the protrusion and then attach the terminal end to the terminal pin, you can remove the protrusion.
There will be some slack at the end of the winding due to the length of the winding over the protrusion.

[0011] As a result, the tension at the winding start portion or the winding end portion of the magnet wire can be relieved, and wire breakage can be prevented.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a method of manufacturing a magnet coil used in a so-called claw-pole step motor will be described below with reference to FIGS. 1 to 5.

First, FIG. 4 shows the overall structure of the magnet coil 21, which consists of two magnet wires attached to a plastic coil bobbin 24 having flanges 23, 23 on both sides of a body 22. 25,2
6 is wound twice. A holder part 23a as shown in FIG. 5 is integrally formed on the upper part of one flange part 23 of the coil bobbin 24, and three terminal pins 27, 28, 29 are erected on this holder part 23a. has been done. One magnet wire 25 is connected to the terminal pin 27.
One end (starting end) 25a is connected to the terminal pin 28, and the other end (terminating end) 25b of the magnet wire 25 is connected to the terminal pin 28.
and one end (starting end) 26 of the other magnet wire 26
a is connected to the terminal pin 29, and the magnet wire 2 is connected to the terminal pin 29.
The other end (terminus) 26b of 6 is connected. In this case, each end 25a, 25 of the magnet wire 25, 26
b, 26a, 26b are terminal pins 27, 28, 28, respectively.
29 is wrapped several times and soldered.

The winding machine 30 used to manufacture the magnet coil 21 described above will now be described. As shown in FIG. 3, this winding machine 30 is configured to rotate a spindle 31 on which the coil bobbin 24 is detachably attached by a drive mechanism including a motor (not shown). Located above the
In this case, a wire supply mechanism having two wire supply nozzles 32 and 33 is provided. Although not shown in detail, this wire supply mechanism includes the nozzle 32,
The magnet wires 25 and 26 are sent out from the tip of the nozzle 33, respectively.
, 33 are configured to move forward, backward, left and right within a predetermined range.

The spindle 31 has a small diameter portion 3 inserted into the body portion 22 of the coil bobbin 24 at its tip.
1a, and a large-diameter portion 31b that is applied to the outer surface of the flange 23 of the bobbin 24 and fixes the bobbin 24 in a non-rotating state when the bobbin 24 is inserted into the small-diameter portion 31a. ing. A metal jig 34 is attached to the upper part of the large diameter portion 31b of the spindle 31.

This jig 34 has a rectangular plate-shaped main plate portion 34a.
It is constructed by making four projections 35 protrude forward from the front edge in a so-called comb-like shape. In this case, the jig 34 is formed by cutting a metal plate into a predetermined shape using, for example, a laser, and then buffing the protrusion 35 portion into a cylindrical shape (for example, 0.5 mm in diameter). . These four protrusions 35, as shown in FIGS. 1 and 2,
When the coil bobbin 24 is attached to the spindle 31, it is located on the right side of the terminal pin 27, on the left side of the terminal pin 28, on the right side of the terminal pin 28, and on the left side of the terminal pin 29, respectively. There is. Further, the length of each protrusion 35 is such that its tip is approximately the same as the inner surface of the collar portion 23.

Now, the procedure for winding the above-mentioned magnet coil 21 using the winding machine 30 will be explained. First, as shown in FIG. 3, terminal pins 27, 28, 29
The coil bobbin 24 with the attached coil bobbin 24 is mounted on the spindle 31 so that the holder part 23a is located at the top. As a result, each protrusion 35 of the jig 34 is positioned to the side of the terminal pins 27, 28, 29, as described above.

Next, the magnet wire 25 to be wound,
The starting ends 25a, 26a of 26 are connected to terminal pins 27, 2, respectively.
8 will be entwined with each other. This work is carried out by the magnet wires 25 and 26 supplied from the nozzles 32 and 33.
While holding the tips of the nozzles 32 and 33 on the side parts of the terminal pins 27 and 28, respectively,
This is done by pulling up the nozzles 32 and 33 while rotating the nozzles 32 and 33 several times in the right-handed screw direction (in the direction of arrows A and B in the figure). As a result, the starting ends 25a and 26a of the magnet wires 25 and 26 are held by the terminal pins 27 and 28, respectively.

Next, the magnet wires 25 and 26 are wound around the body 22 of the coil bobbin 24. This operation involves rotating the coil bobbin 24 integrally by rotating the spindle 31 at high speed in the direction of arrow C (see FIG. 3) while supplying the magnet wires 25 and 26 at a predetermined speed from fixedly positioned nozzles 32 and 33. This is done by letting Then, at this time, immediately before rotating the spindle 31, the nozzles 32, 33 are moved to the position of the inner end of the flange 23, and then the nozzles 32, 33 are raised and rotated approximately once.

Then, as shown in FIG. 1, the winding start portion of the magnet wire 25 (the portion from the start end 25a until it is wound around the body 22) is placed at the leftmost end of the protrusion 35 of the jig 34. Similarly, the winding start portion of the magnet wire 26 is also wrapped around the third protrusion from the left among the protrusions 35 of the jig 34. After this, pull up the nozzles 32 and 33,
By rotating the spindle 31, the winding operation is started.

During the winding operation, the nozzles 32 and 33 are reciprocated between the flanges 23 and 23 in the axial direction of the spindle 31, and the magnet wires 25 and 26 are uniformly applied to the body 22.
so that it is wound. However, at the start and end of winding, the nozzles 32 and 33 are located close to the holder portion 23a.

Magnet wires 25 and 26 with a predetermined number of turns
When the winding operation is completed, the spindle 31 also stops with the terminal pins 27, 28, 29 facing upward. Next, this time, the terminal end 25b of the magnet wire 25 is connected to the terminal pin 28, and the terminal end 26b of the magnet wire 26 is connected to the terminal pin 28.
The work of attaching the terminal pins 29 to the terminal pins 29 is performed. This work is also performed by rotating the nozzles 32 and 33 around the terminal pins 28 and 29, respectively, several times in the right-handed screw direction (in the directions of arrows D and E in FIG. 2). Then, shake the nozzles 32 and 33 slightly to the left. Then, as shown in FIG. 2, the winding end portion of the magnet wire 25 (the portion from the portion wound around the body portion 22 to the terminal end portion 25b) touches the protrusion 3 of the jig 34.
5, which is located second from the left, and the winding end portion of the magnet wire 26 is also
Similarly, it is placed over the rightmost protrusion 35 of the jig 34.

Thereafter, the magnet wires 25 and 26 are cut at the tips of the nozzles 32 and 33, and then the coil bobbin 24 is removed from the spindle 31. By removing the coil bobbin 24, the jig 34
The protrusions 35 are pulled out from the terminal pins 27, 28, 29, and as a result, as shown in FIGS. This means that there is slack due to the amount of work that was being done.

Furthermore, after this, the magnet wire 25
, 26 to the terminal pins 27, 28, 29 is performed. In this process, the terminal pins 27, 28, 29
This is done by dipping it face down into a molten solder bath (not shown). At this time, thermal stress is applied to the winding start portion and winding end portion of each of the magnet wires 25 and 26. However, as described above, the magnet wires 25 and 26 have slack at the beginning and end of each winding and are not under much tension, so even if thermal stress is applied, the magnet wires 25 and 26 will not be disconnected.

According to this embodiment, the jig 34 having the protrusions 35 is attached to the spindle 31, and the protrusions 35 are placed on the sides of the terminal pins 27, 28, 29 when the coil bobbin 24 is attached to the spindle 31. When the magnet wires 25, 26 start winding around the body 22 of the coil bobbin 24, the winding work is performed after wrapping the winding start portions around the protrusions 35. After the winding of the magnet wire 26 was completed, slack could be created at the beginning of the winding of the magnet wire 25. Furthermore, at the end of winding, the end portions of the magnet wires 25 and 26 are wrapped around the protrusion 35, and then the terminal ends 25b and 26b are attached to the terminal pins 28 and 29, respectively. I was able to create slack.

As a result, unlike the magnet coil 1 manufactured by the conventional method, in which a large tension is applied to the winding start and winding end of the magnet wires 5 and 6, wire breakage is likely to occur. The tension at the beginning and end of winding 25 and 26 can be significantly alleviated, and wire breakage can be prevented.

In the above embodiment, the magnet wire 2
Both the winding start part and the winding end part of Nos. 5 and 26 are covered with protrusions 35.
However, it is not necessarily necessary to span both sides, and slack may be added to only one of them as necessary. In addition, the jig 3 having the protrusion 35
4 is attached to the spindle 31, for example, a similar jig may be detachably attached to the coil bobbin 24 side. Furthermore, if the tip of the protrusion 35 is tapered or otherwise tapered, attachment to and removal from the coil bobbin 24 can be performed more smoothly.

In addition, the present invention can be applied not only to claw pole type step motors but also to general magnet coils formed by winding magnet wire around a coil bobbin, and the present invention can be implemented with appropriate modifications within the scope of the gist. It's something you get.

[0029]

Effects of the Invention As is clear from the above explanation, according to the method of manufacturing a magnetic coil of the present invention, a protrusion that rotates integrally with the spindle of a winding machine is provided, a coil bobbin is mounted on the spindle, and a terminal pin is attached to the coil bobbin. The protrusion is positioned on the side, and the winding start part and/or the winding end part of the magnet wire on the body is wrapped around the protrusion, and then the protrusion is removed, so that the winding start part or the winding end part of the magnet wire This provides an excellent effect in that the tension acting on the end portion of the winding can be reduced to prevent wire breakage.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is an enlarged perspective view of a main part showing a winding start portion of a magnet wire.

[Figure 2] An enlarged perspective view of the main part showing the end of winding the magnet wire

[Figure 3] A perspective view of the main parts showing how the coil bobbin is attached to the spindle

[Figure 4] Perspective view of magnet coil

[Figure 5] Enlarged top view of terminal pin part

[Figure 6] A diagram equivalent to Figure 4 showing a conventional example

[Figure 7] Diagram equivalent to Figure 3

[Explanation of symbols]

21 is a magnet coil, 22 is a body part, 23 is a flange part, 2
3a is a holder part, 24 is a coil bobbin, 25, 26 are magnet wires, 25a, 26a are starting ends, 25b, 2
6b is a terminal end, 27, 28, 29 are terminal pins, 30 is a winding machine, 31 is a spindle, 32, 33 are nozzles, 34 is a jig, and 35 is a protrusion.

Claims (1)

[Claims] [Claim 1] A coil bobbin having a plurality of terminal pins erected on the outer periphery of a flange is mounted on a spindle of a winding machine,
After attaching the starting end of the magnet wire supplied from the wire supply mechanism to the terminal pin, the spindle is rotated to wind it around the body of the coil bobbin, and after winding, the terminal end of the magnet wire is attached to the other terminal pin. In the method for manufacturing a magnetic coil, a protrusion is provided that rotates integrally with the spindle of the winding machine, the coil bobbin is attached to the spindle, the protrusion is positioned on the side of the terminal pin, and the magnet coil is attached to the coil bobbin. A method for manufacturing a magnetic coil, characterized in that a winding start portion, a winding end portion, or both of the winding start portion and the winding end portion of the wire on the body portion, or both, are wrapped around the protrusion, and then the protrusion is removed.