JPS6254224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing magnetic proximity switches, and in particular to testing and adjusting operating characteristics during manufacturing.

[Background Art] As a magnetic proximity switch, there is a conventional reed switch in which a reed piece is enclosed in a glass tube, but due to its structure, it is difficult to change or adjust the contact pressure or magnetic sensitivity during or after manufacturing. If this is not possible and a certain contact pressure or magnetic sensitivity is desired, it is necessary to change the contact material or lead piece material to change its Young's modulus, or to separately install an auxiliary magnet. It is impossible to make adjustments in a strict sense after completion, and in the end,
It has not been possible to obtain a magnetic proximity switch whose characteristics are accurately controlled, and the problem has been that of variations in operating characteristics.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a method for manufacturing a magnetic proximity switch that allows easy checking and adjustment of operating characteristics during manufacturing. There is something to do.

[Disclosure of the Invention] According to the present invention, a fixed contact made of a magnetic material is arranged at one end of a coil frame around which a coil is wound, and a lead fixing piece that can be plastically deformed is arranged at the other end, and is arranged to penetrate through the coil frame. The proximal end of the lead piece is fixed to the lead fixing piece, and the free end is attached to the fixed contact so that it can move toward and away from the fixed contact, and is fixed by the magnetic flux generated in the lead piece when an external magnetized object to be detected approaches. By switching between the contact point and the free end of the reed piece, the reed piece is actuated by the magnetic field generated by the coil, its operating state is confirmed, and the reed fixed piece is plastically deformed.
This device is characterized by testing and adjusting operating characteristics, and the magnetic field generated by the coil simulates a state in which the object to be detected is in close proximity, and the test and adjustment are performed in this state. It is.

The present invention will be described in detail below based on the illustrated magnetic proximity switch. In the figure, reference numeral 2 denotes a coil frame, which is formed in half and is provided with a component holding part 8 and a bobbin part 9, respectively. The coil 1 is wound around the outer periphery of the bobbin portions 9 of both molded bodies AB.

In one end of the coil frame 1, a normally open fixed contact 3 and a normally closed fixed contact 4 are arranged to face each other apart, and both fixed contacts 3 and 4 made of magnetic material are magnetized to have different polarities from each other. A permanent magnet 12 is provided. The fixed contacts 3 and 4 each have a fixed terminal 1
It is formed by bending the upper part of 0 and 11.

A common terminal 5 is disposed at the end of the molded body A opposite to the fixed terminal 10. This common terminal 5 has a plastically deformable lead fixing piece 5a on its upper part.
is provided.

Further, the coil frame 2 is provided with coil terminals 7 to which both ends of the coil 1 are connected. As will be described later, this coil terminal 7 is used for testing and adjustment, and is not used as a magnetic proximity switch.

A lead piece 6 is disposed through the coil frame 2, one end of which is fixed to the lead fixing piece 5a by welding or other means, and the other end of which is located between the pair of fixed contacts 3 and 4. There is. This reed piece 6 is made of a magnetic material and has spring properties so that it can respond to an external magnetic field and pass the magnetic flux, and when there is no external magnetic field, due to its spring properties, The free end is brought into contact with the fixed contact 4 on the normally closed side.

In the figure, 15 and 16 are convex ribs and concave grooves for positioning used when aligning both molded bodies AB,
17 is a convex stepped portion for regulating the distance between the fixed contacts 3 and 4, and 18 is a hole for adjusting the distance between the fixed contacts 3 and 4.

In the magnetic proximity switch shown here, as mentioned above, the lead piece 6 is normally in contact with the normally closed fixed contact 4 due to its spring property, so the common terminal 5 and the fixed terminal 11 There is continuity between the two. However, when a magnetized object to be detected, such as a permanent magnet, approaches in the direction shown by the white arrow in FIG. When the free end of the lead piece 6 is magnetized to the same polarity as the magnetic pole of the normally closed side fixed contact 4 by the permanent magnet 12,
The lead piece 6 bends against its springiness and is held by suction on the normally open fixed contact 3.

The operating characteristics of this magnetic proximity switch constructed and operated as described above are adjusted by the following procedure during its manufacture. That is, before each component is assembled to the coil frame 2 and the cover 14 is placed on the coil frame 2, the coil 1 generates a magnetic field equivalent to the magnetic field that acts on the lead piece 6 due to the proximity of the object to be detected. The operation characteristics are checked by simulating the state in which the sensing object is close and observing the movement of the lead piece 6 at that time. Depending on the result of this check, the lead to which one end of the lead piece 6 is fixed is checked. Adjustment is performed by plastically deforming the fixed piece 5a using an appropriate jig.

The magnetic sensitivity can be confirmed from the strength of the magnetic field generated by the coil 1 when the reed piece 6 reverses and switches the contact, and the contact pressure is determined by the above magnetic sensitivity and the springiness of the reed piece 6. It can be inferred from. The above adjustment by plastically deforming the lead fixing piece 5a can be performed in a state where the coil 1 is energized, that is, in a state simulating the proximity of the object to be detected, so it is extremely difficult to obtain the desired operating characteristics. It's easy.

Once the above adjustments are completed, the opening of the coil frame 2 is sealed with tape 13 and covered with a cover 14 made of a resin material, or placed in an appropriate non-magnetic case and molded with resin. Since the coil terminal 7 is unnecessary after the adjustment is completed, it may be cut and removed.

As is clear from the above, the structure of this magnetic proximity switch is very similar to that of a polarized reed relay, so it is possible to produce it by sharing most of the manufacturing processes of the polarized reed relay. Therefore, although the magnetic proximity switch is equipped with a coil 1 for test adjustment, which is not necessary for the operation of the magnetic proximity switch itself, the cost does not increase significantly.

[Effects of the Invention] As described above, in the present invention, by plastically deforming the plastically deformable lead fixing piece, operating characteristics such as contact pressure and magnetic sensitivity can be adjusted. This adjustment of the operating characteristics can be done by checking the operating characteristics in a state where a magnetic field is generated by a coil, simulating the proximity of the object to be detected, or by actually bringing the object to be detected closer. It is possible to precisely control the strength of the magnetic field, rather than using the It is something that can be supplied.

[Brief explanation of the drawing]

1 and 2 are perspective views of a molded body constituting a coil frame of a magnetic proximity switch according to the present invention;
The figure is a broken perspective view of the magnetic proximity switch same as above, No. 4
The figure is a schematic horizontal sectional view of the same as above, and 1 is a coil, 2 is a coil frame, 3 and 4 are fixed contacts, 5 is a common terminal, 5a is a lead fixing piece, 6 is a lead piece, 7 is a coil terminal, 12 indicates a permanent magnet.

Claims (1)

[Scope of Claims] 1. A fixed contact made of a magnetic material is arranged at one end of a coil frame around which a coil is wound, and a lead fixing piece that can be plastically deformed is arranged at the other end, and the lead piece is arranged to penetrate through the coil frame. The proximal end is fixed to the lead fixing piece, and the free end is attached to the fixed contact so that it can move toward and away from the fixed contact, and the magnetic flux generated in the lead piece when an external magnetized object approaches the fixed contact and the lead Test the operating characteristics by switching the lead piece into and out of contact with the free end of the lead piece, activating the lead piece using the magnetic field generated by the coil, confirming its operating state, and plastically deforming the lead fixed piece. A method of manufacturing a magnetic proximity switch characterized by adjusting the switch. 2. The method for manufacturing a magnetic proximity switch according to claim 1, which comprises cutting and removing the coil terminal connected to the coil after the test and adjustment.