JPH05315165A - Method and apparatus for core installation - Google Patents

Abstract

PURPOSE:To enable the reliable installation of a core requiring no core installation pin by holding a coil bobbin, placing a U-shaped core on both sides thereof and installing these cores into the coil bobbin using magnetic force. CONSTITUTION:With a coil bobbin 1 held by a holder, U-shaped cores 4 are placed on plates 5 in close contact with iron cores 6 of electromagnets. Switches 7 are turned on to magnetize the iron cores 6, giving the magnetic poles to the plates 5 in close contact therewith as well. The cores 4, also given the magnetic poles, generate attractive force; consequently, they are attracted by each other and installed into the coil bobbin. Thus the method requires no core installation pin. In this method, the cores are fitted while being in close contact with the plate faces; they moves in parallel with each other. This installs cores into a bobbin in a stable posture, irrespective of the fitting speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling method and an assembling apparatus for assembling a pair of split cores into a coil bobbin in an assembly process of an automatic coil assembling machine.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a coil element such as a transformer or a choke coil used in a power supply device of an electronic device. As shown in FIG. 5, in order to press both sides of the two U-shaped cores 4 inserted into the coil bobbin 1 from the left and right, a holder 13 having a spring property is inserted from above and assembled. Conventionally, when assembling such a coil element with an automatic assembling machine, as a method of assembling the core into the coil bobbin, as shown in FIG. 4, the coil bobbin 1 is mounted on the holder 2 and held, and the core 4 is mounted on the plate 10. The core 4 is assembled by pushing the back surface of the core with the assembly pin 12 driven by an actuator such as the air cylinder 11. Further, as shown in FIG. 6, the assembled core 4 has no constraint on the coil bobbin 1, so that when the coil bobbin 1 is transferred to the mounting stage of the holder in the next step by the gripping hand 14 or the like,
In order to prevent the core from falling, the grip claw 15 has the convex portion 16 for the purpose of pressing the core 4 from both the assembling directions.

[0003]

In the conventional core assembling method and core assembling apparatus, when the coil bobbin having the core incorporated therein is gripped on the holder, the assembling pin is in a state where the core is incorporated (closed). In order to avoid interference with the convex portion, only a height of about two-thirds of the total height of the core can be secured and the tact time of the assembling machine itself is shortened. If it is raised, the posture of the core becomes unstable during the assembling, and there is a problem that the core cannot be incorporated into the coil bobbin.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable core assembling method and apparatus which do not require core assembling pins.

[0005]

According to the present invention, a coil bobbin is held at a predetermined position, U-shaped cores are arranged on both sides of the coil bobbin, and the cores are attached to the coil bobbin by magnetic force. A core-incorporating method is obtained.

Further, according to the present invention, it is provided with a holding means for holding the coil bobbin at a predetermined position, and two electromagnets mounted on the coil bobbin by moving the cores respectively arranged on both sides of the coil bobbin by electromagnetic force. A core built-in device is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the core (not shown) is inserted into the groove 3 with the coil bobbin 1 mounted on and held by the holder 2. Figure 2
FIG. 4 is a configuration diagram of a core built-in portion in which a holder is omitted,
It is a figure which shows the state before incorporating into the bobbin 1. In FIG. 2, the core 4 is placed on the plate 5, and the plate 5 is in close contact with the iron core 6 of the electromagnet. The electromagnet unit comprises an iron core 6, a switch 7, a power source 8 and an electric wire 9 wound around the iron core 6 at the same pitch. When the switch 7 is turned on, the iron core 6 is magnetized and N and S magnetic poles appear at both ends thereof. ..
In this case, since the magnetic poles generated at both ends of the iron core 6 of the electromagnet are left and right opposite to each other, it is necessary to reverse the current flowing directions of the respective electromagnets. This is the direction of the electrode connected to the electric wire 9. Determined by

FIG. 3 shows a state in which the core 4, the plate 5 and the iron core 6 each have a magnetic pole. When the iron core 6 is magnetized, the plate 5 in close contact with the iron core 6 also has magnetic poles, and the core 4 also has magnetic poles as shown in the figure, so that an attractive force is generated between the cores and the cores are attracted to each other to be assembled. The plate 5 is, of course, made of a material that is easily magnetized, such as iron, and the contact surface with the core 4 preferably has a mirror surface state in order to reduce sliding friction resistance.

[0009]

EFFECTS OF THE INVENTION The present invention does not require a built-in pin of the core, and the core is pushed in close contact with the plate surface, so that the cores move in parallel and are stable without being affected by the pushing speed. The core can be incorporated into the bobbin in this posture.

[Brief description of drawings]

FIG. 1 is a perspective view in which a coil bobbin is attached to a holder according to the present invention.

FIG. 2 is a configuration diagram of a core built-in portion in which a holder is omitted in the present invention.

FIG. 3 is a diagram showing a state in which a core, a plate, and an iron core according to the present invention have magnetic poles.

FIG. 4 is a diagram for explaining a conventional core incorporation method.

FIG. 5 is a perspective view showing an assembly of a transformer and a choke coil in a conventional core assembling method.

FIG. 6 is a view showing a state in which a coil bobbin is gripped by a gripping hand in a conventional core assembling method.

[Explanation of symbols]

 1 coil bobbin 2 holder 3 groove 4 core 5 plate 6 iron core of electromagnet 7 switch 8 power supply 9 electric wire

Claims (2)

[Claims] 1. A coil bobbin is held at a predetermined position, and U-shaped cores are arranged on both sides of the coil bobbin, respectively.
A core assembling method is characterized in that these cores are magnetically attached to the coil bobbin. 2. A holding means for holding the coil bobbin at a predetermined position, and two electromagnets mounted on the coil bobbin by moving cores respectively arranged on both sides of the coil bobbin by electromagnetic force. Core embedded device.