JPS59114806A - Electromagnetic coil parts - Google Patents

Abstract

PURPOSE:To guide a lead wire securely and improve workability as well as reduce the number of parts, by a method wherein a guide leg with a groove to guide a lead wire to a flange of a coil bobbin is molded integral with the flange. CONSTITUTION:A guide leg 4 is composed of a first part 41 and a second part 42. The first part 41 is set to length (l) corresponding to height of bottom of a core inserted to a hollow part A of a coil bobbin 1. The second part 42 is inserted in a through hole of a print board. A groove 5 is formed in the first part 41 and the second part 42, and a conductor 3 is guided through the groove 5. Particularly in the first part 42, if width or diameter of the groove is made slightly smaller than diameter of the conductor 3, the conductor 3 is locked by forcing the end thereof against the groove. In order to wind the conductor to the coil bobbin 1, the conductor 3 is guided from one end to the groove 5 of any one of the guide leg 4 and introduced to a winding drum 6. After winding in prescribed turns, other end of the conductor 3 is guided to the groove 5 in other guide leg 4 and locked and the final end part is introduced to upper side of the second part 42.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electromagnetic coil component, and particularly to a coil bobbin of an electromagnetic magnet used in an impact printer such as a wire matrix print head or a line printer.

[Prior art]

In known wire matrix printheads and line printers, electromagnetic magnets are used to drive wires and type.

For example, an excitation coil used in a known wire matrix print head is as shown in FIG.
The conductor 5 can be wrapped around the terminal pin 2 fixed on the flange Z and soldered, or the conductor 5 can be directly pulled out as shown in FIG.

The end is soldered to a printed circuit board, etc. However, in the former case, the number of parts for the excitation coil is large, and the number of man-hours required to manufacture the coil is large.

It's complicated and busy. In addition, the terminal pins 2 are extremely conductive, and if they are placed too close to each other in order to increase the packaging density, there is a risk that the ends of the conductors 3 will become electrically conductive, which poses restrictions on their mounting.

On the other hand, for the latter, it is necessary to place the excitation coil in a predetermined position and solder the end of the conductor 3. Especially when the packaging density increases, the workability of guiding, distributing, and soldering the end of the conductor 3 becomes difficult. The drawback is that it gets worse.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic coil component that allows the conductor at the end of an excitation coil to be guided very easily and has improved workability.

Another object of the present invention is to provide an electromagnetic coil component that does not require a particular increase in the number of components used as an excitation coil.

[Summary of the invention]

In order to achieve such an object, the present invention has a winding drum for winding a conductor such as an enameled wire, and a coil bobbin having seven lunges. Guide legs are integrally provided on the flange to guide the flange.

That is, the 1st volume cylinder, 7th flange, and the guide leg can be integrally constructed as a synthetic resin molded product.

Unlike the prior art, there is no need to reattach terminals and the like as external components, and the number of components can be reduced.

Additionally, the guide leg is provided with a groove. Since the lead wire is guided within this groove, it is easy to guide and arrange the end of the lead wire to a connection point such as a printed circuit board.

[Embodiments of the invention]

Figure 6 shows how the present invention can be applied to wire matrix printing.
FIG. 2 is a perspective view of a coil bobbin 1 according to an embodiment applied to a t'fIi coil. An example of this type of printing head is the one shown in Japanese Patent Application No. 57-59521. This coil bobbin 51 has approximately one winding cylinder 6.
．． 7 langes 7 provided at both ends of this winding drum 6 and on one flange Z.

It consists of 2 11ffiJ inner legs 4 provided with Of course, the coil hobbin 1 is made of insulating material such as plastic.

It is molded into one piece.

The winding drum 6 has multiple conductors 3 such as enamelled wires.

K windings are made, and a magnetic pole such as a core is inserted into the hollow part A. It is constructed by removing the side portions, leaving the top portion 61 and bottom portion 62 having a trapezoidal cross section. In particular, the side part has been removed from the first volume.

This is because it is expected to have a heat dissipation effect on the heat generated from the conductor.

Of course, if there is no particular need for heat dissipation, the upper side portion 61. Bottom part 62. and the side portions may all be connected in a columnar shape.

The height of the winding drum 6 corresponds to the height of a core (not shown), and seven langes 7 are provided at both ends of the winding drum 6.

Two guide legs 4 are provided on one of the 7 langes z to guide the end of the conductor 3. This guide leg 4 has a trapezoidal upper side portion in cross section.

Each is provided at the bottom. A proposal in such a position.

The internal pushers 4 are provided in consideration of the mounting efficiency of the excitation coil in the wire matrix type print head. The reason for this will be explained later.

These guide legs 4 have a first part 41 and a second part 42.
Consists of. The length l of the first portion 41 is set in accordance with the height of the bottom of the core inserted into the hollow portion Δ of the coil bobbin 1. The second portion 42 is a portion inserted into a through hole 101 of a printed circuit board 1o, which will be described later, and reliably guides the end of the conductor 6 to the back side of the printed circuit board 10.

This first portion 41. A groove 5 is formed in the second part 42, through which the conductor 3 is guided as shown in FIG. In particular, if the width or diameter of this groove is made slightly smaller than the diameter of the conductor 3 at least in the first portion 42, the end of the conductor 3 can be locked simply by being pushed into this groove.

When winding a conductor around the coil pobbin 1 configured in this way, first, the conductor 6 is guided from one end into the groove 5 of one of the guide legs 4 to the winding drum 6. After winding the conductor 6 a predetermined number of times, the other end of the conductor 6 is guided and locked into the groove 5 of the other guide leg 4, and the end is inserted into the second portion 4.
2. In this way, the excitation coil 11 as shown in FIG. 4 is constructed.

FIG. 5 is a diagram for explaining how an excitation coil for driving an armature is mounted in a wire matrix print head.

The plurality of excitation coils 11 are connected to an armature or a wire (
(not shown) are arranged substantially concentrically on the printed circuit board 10, and the second portions 42 of the guide legs 4 are respectively inserted into the corresponding through poles IQ1. The upper part of the printed circuit board 1o is electrically connected to each through hole IQ1, and a printed pattern 7102 is formed.

In the excitation coil 11 assembled as shown in FIG. 4, the end of the conductor 3 is guided in the groove 5 of the guide leg 4, and its tip protrudes from the upper part of the second portion 42. When the second portion 42 is inserted into the through pole 1o1, the tip of the conductor 3 is guided to the back side of the printed circuit board 10. On this back side, the tip of the conductor 6 is soldered to the through hole. Of course, since the conductor 3 is a wire material such as an enameled wire, the coating at the tip thereof is removed and soldered.

Therefore, the print pattern 102S is printed by a known print control circuit.
Through hole 1o1. A pulsed current is applied to the excitation coil 11 via the solder portion and the conductor 3.

Although not particularly shown, the space between the printed circuit board 1° and the lower flange 7 of the excitation coil 11 and the space between the excitation coil 1
A core is arranged in the hollow part A of 1.

In the known wire matrix print head.

Some have 16 or even 24 wires.

Thus, as the number of wires increases.

The exciting coil 11 is also densely mounted. Therefore, in order to make it easier to solder the tip of the conductor 3 led from the excitation coil 11, it is preferable to arrange the two guide legs 4 as far apart as possible within the range of zero flange area. Taking these into consideration, each guide leg 4 is provided at the position described above.

In the above embodiment, the excitation coil applied to the known wire matrix print head can easily guide and route the conductor ends, and a structure suitable for high-density packaging can be achieved.

[Other Examples]

The present invention is not limited to the embodiments described above, and can be implemented with various modifications.

For example, considering that the excitation coils are arranged densely in a concentric circle, the cross-sectional shape of the coil bobbin winding/body 6 and 7 flange 7 is approximately trapezoidal. may be fan-shaped or isosceles triangular.

In addition to the known wire matrix type print head, for example, when used for a known line printer or simply as an electromagnetic magnet, the cross-sectional shape may be rectangular or circular depending on the application.

It is understood that shapes such as ellipses and the like can be used.

In addition, the positions where the two guide legs 4 are provided on the flange Z are as shown in Fig. 3, taking into consideration workability such as mounting the excitation coil in the wire matrix print head and soldering the conductor. position, but these do not need to be considered.

It can be placed anywhere on the same flange z.

However, since it is necessary to solder the conductor 6 of the coil to a printed circuit board, etc., the guide legs 4 should be spaced at a certain distance to prevent short circuits between the ends of the conductors and spots caused by solder icicles. It is better if it is provided.

Also, if only the problem with the above sheet could be solved.

There does not necessarily have to be two guide legs. That is.

Two grooves may be provided in one guide leg, and the ends of the conductors may be guided into the respective grooves, and the tips of the respective conductors may be guided to positions separated by a certain distance and soldered.

Furthermore, as another modification, the guide leg 4 does not necessarily need to be molded separately into a first part 41 and a second part 42. For example, the guide leg may be made gradually thinner toward the tip, and the tip may be inserted into a through hole. in this case.

When the excitation coil is mounted, the distance between the lower flange and the printed circuit board is necessarily determined by the mounting state, since the coil portion is mounted on the yoke.

Further, when the second portion or the tip of the guide leg is inserted into the through hole of the printed circuit board, the tip of the conductor is reliably guided to the back side of the printed circuit board. However, if the tip of the conductor is made to protrude almost straight from the first part, the second part may not necessarily be provided. Even in this case, only the tip of the conductor can be inserted into the through hole.

It is understood that other modifications may be made within the scope of the present invention.

〔Effect of the invention〕

According to the present invention, the guide leg in which the groove for guiding the lead wire is formed in the 7 lange of the coil bobbin is integrally molded with the flange, so the lead wire can be guided reliably and 6 workability is improved. do. Further, the coil bobbin can be constructed without significantly increasing the number of parts compared to the prior art.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing conventional electromagnetic coils, and Figure 6 is a perspective view showing a conventional electromagnetic coil.
FIG. 4 is a perspective view showing a coil bobbin according to an embodiment of the present invention, FIG. 4 is a perspective view showing a state in which a conductor is wound around the coil bobbin shown in FIG. 6, and FIG. 5 is a perspective view showing a coil bobbin according to an embodiment of the present invention. FIG. FIG. 1... Coil bobbin 3... Conductor 4... Guide leg 5... Guide groove 6... Winding drum 7... Flange 11... Exciting coil

Claims (1)

[Scope of Claims] (1) An electromagnetic coil component comprising: a winding drum around which a conductor is wound multiple times; a flange provided at at least one end of the winding drum; (2) Two guide legs are provided on the flange. 2. The electromagnetic coil component according to claim 1, wherein each guide leg locks and guides each end of the conductor. (6) A groove is formed in the length direction of the guide leg. 3. The electromagnetic coil component according to claim 1, wherein the end of the conductor is fitted into and locked in the groove. (4) The cross-sectional shape of the winding drum is trapezoidal, triangular, or fan-shaped, and the first q guide leg is provided on the flange corresponding to the upper side of the trapezoid or the apex of the triangle or fan-shape; 3. The electromagnetic coil component for a wire matrix print head according to claim 2, wherein the second guide leg is provided on seven lunges corresponding to the base of the triangle or the arc of the sector. (5) The electromagnetic coil component according to any one of claims 1 to 4, wherein the tip of the guide leg is shaped to be inserted into a through hole of a printed circuit board.