JPS5848755Y2 - Proximity switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a proximity switch for detecting the arrival of a carrier on a conveyor such as a trolley conveyor.

Conventionally, as shown in FIG. 1, a device for detecting the passage of a carrier 2a has a proximity switch 4a fixed to the rail 1a side and a magnet 6a serving as a striker fixed to the carrier 2a side, and uses magnetism from the magnet 6a to detect the approach of the carrier 2a. It is a method to detect
The magnet 6a fixed to the carrier 2a side via a bracket 5a is chamfered 6 as shown in FIG.
b) and was fixed to the bracket) 5a by a plurality of poles)-8a.

However, in the conventional device described above, when the magnet 6a is disposed close to the proximity switch 4a in order to ensure the operation of the proximity switch 4a, when the magnet 6a comes into contact with the proximity switch 4a, a tremendous attraction force is generated to prevent the magnet from advancing. is added to the carrier 2a, which is inconvenient, and the structure of mounting the magnet 6a is relatively complicated.

The present invention eliminates the above drawbacks, and embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 3, a carrier 2 is movably suspended from a rail 1, and a hanger 3 is suspended from the carrier 2.

A proximity switch 4 is provided on the rail 1 so as to protrude laterally, and below the proximity switch 4, as shown enlarged in FIGS. 4 and 5, a carrier 2 is made of a non-magnetic material such as stainless steel. A cylindrical magnet 6 serving as a striker is rotatably arranged with respect to the mounting pin 5 with its radial direction facing the advancing direction of the carrier 2.

At this time, the magnet 6 is placed as close as possible to the proximity switch 4 with a small gap 7 between them.

Now, since the present invention is constructed as described above, it operates as follows.

When the carrier 2 is guided by the rail 1 and reaches the proximity switch 4 position, the proximity switch 4 senses the magnetism of the magnet 6 attached to the carrier 2 and detects the arrival of the carrier 2.

At this time, in the present invention, the magnet 6 can be brought sufficiently close to the proximity switch 4, so that the proximity switch 4 can operate reliably.

Further, since the magnet 6 is cylindrical and rotatable, the magnet 6 is attached to the proximity switch 4 by swinging the hanger 3 or the like.
Even if they collide, the magnet 6 rotates and does not exert any undesirable attractive force on the proximity switch 4.

That is, a conveyed object (not shown) that can smoothly pass through the proximity switch 4 position and be conveyed to the proximity switch 4 or the magnet 6 itself, or to the drive unit, and furthermore, by the hanger 3.
There is also no risk of causing an inconvenient impact force.

Note that the present invention is not limited to the above embodiments,
Various modifications may be made without departing from the spirit of the present invention.

For example, the magnet 6 is not limited to a cylindrical shape, and the proximity switch 4
Of course, it may also have a circular cross section, such as a sphere or an oval shape, which can rotate when it collides with the object.

Further, instead of the configuration in which the magnet 6 rotates relative to the mounting pin 5, it is also possible to adopt a configuration in which the magnet 6 and the mounting pin 5 are fixed to each other, and the mounting pin 5 rotates relative to the carrier 3.

Furthermore, the same effect as described above can be obtained by replacing the mounting positions of the proximity switch 4 and the magnet 6, respectively.

Furthermore, it goes without saying that the proximity switch according to the present invention can be applied not only to trolley conveyors but also to other conveyors.

As explained above, the present invention provides the following significant effects as a striker for a proximity switch.

(1) The magnet has a circular cross section, is configured to be rotatable, and is placed as close as possible to the proximity switch, so the proximity switch can reliably detect the approach of the carrier. Even if the magnet collides with the proximity switch, unlike conventional strikers, the attracting force of the magnet will not cause any inconvenience such as blocking the carrier from moving forward.

(2) Since the sliding force according to the present invention has an extremely simple structure, it is easy to manufacture, the manufacturing cost is low, the maintenance, inspection, and repair of the device is extremely easy, and the service life is long.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional device, with Figure 1 being a front view of the trolley conveyor, and Figure 2 being an enlarged side view of the main parts of the proximity switch and striker portion. Figure 3.4.5 shows the device according to the present invention;
・Front view of the roller conveyor, Figure 4 is an enlarged front view of the main parts of the proximity switch and striker, Figure 5 is the ■-■ of Figure 4
FIG. 3 is a cross-sectional side view taken along lines. 4... Proximity switch, 6... Magnet (strike).

Claims (1)

[Scope of utility model registration request] A proximity switch operated by magnetism, characterized in that a magnet with a circular cross section is rotatably provided as a striker.