JPS635203Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic chuck, and more specifically includes a magnetization detection device embedded in the face plate of the magnetic chuck, and a transmitter that emits a signal by detecting the magnetization. This relates to a magnetic chuck.

Magnetic chucks have traditionally been used to magnetically attract and fix materials, parts, devices, etc. made of magnetic substances, or to attract and transport them, but there are also devices that use electromagnets as the source of attraction force. Even in devices using permanent magnets as a source of attraction force, there has been no simple device for detecting that the surface plate to be attracted is magnetized.

In other words, in the case of an electromagnetic chuck, it is determined that it is magnetized if the current switch to the electromagnet is turned on, and in the case of a permanent magnet chuck, it is determined that it is magnetized if the switching lever is turned to the ON direction. They would conclude that there was a problem and move on to the next process.

In this case, if materials and parts were to be picked up manually, it would be possible to confirm that they are being picked up, but with the steady progress of F, M, and S (unmanned manufacturing systems), now all that is required is to turn on the switch or switching lever mentioned above. Even if magnetization is not actually done (for example, when the wiring after the switch is cut, or when the shaft of the switching lever spins idle), the equipment, tools, and materials involved are transferred to the next process. This was an inconvenience that could have caused significant damage.

The present invention has been made to overcome the above-mentioned disadvantages, and preferred embodiments will be described in detail below based on the drawings.

FIG. 1 illustrates a rectangular electromagnetic chuck 1, the face plate 3 of which has one magnetic pole plate 5 that occupies the entire thickness of the face plate.
and another magnetic pole plate 7 buried parallel to the upper surface of the magnetic pole plate 5 are provided with a magnetic insulating material 8 (see Figures 3 and 4, copper alloy, etc.) interposed therebetween, and a power lead wire is connected to the magnetic pole plate 7. This is a device that generates an attracting magnetic force to both magnetic pole plates using a coil installed under the face plate using a current from the magnetic pole plate.

What is shown in FIG. 2 is a rectangular permanent magnetic chuck 11 using a permanent magnet as a source of attraction force, and the face plate 3, one magnetic pole plate 5, and the other magnetic pole plate 7 are the same as those in FIG. In the case of the permanent magnetic chuck 11, a comb-shaped permanent magnet is provided under the face plate 3 at the same pitch as both magnetic pole plates on the face plate, so as to be able to slide freely in the left and right direction in FIG.
For example, when the lever 13 is in the position shown in FIG.
Both magnetic pole ends of the permanent magnet under the face plate are magnetized to occupy positions corresponding to the first magnetic pole plate 5 and the other magnetic pole plate 7 to perform an adsorption action, and rotate the lever 13 upwardly and to the right. When the above correspondence is resolved, both magnetic pole plates are demagnetized and lose their attractive force.

3 and 4 illustrate the device of the present invention, in which one wide magnetic pole plate 5 at the right end of the face plate 3 is divided into a frame part 15 and a lid part 17 in the thickness direction. Part 15
A reed switch 19 is buried in a recess formed approximately in the center of the reed switch 19. The reed switch 19
A bullet 21 is provided between the frame part 15 and is biased so that its upper surface is always in contact with the cover part 17, and the reed switch is about 3/4 of the distance corresponding to the frame part 15. A magnetic shielding plate 23 is provided around the circumference.

The reed switch 19 also has a fixed contact 25.
and a movable contact 2 that is magnetically attracted and curved.
7 is sealed together with an inert gas such as nitrogen gas, and the movable contact 27 does not come into contact with the fixed contact 25 except when it is magnetically attracted by the elasticity of its base and curved upward.

The conductive wire 29 led from the movable contact 27 connects the battery 3
1, the light bulb 3 remains insulated from the frame portion 15.
3, and the other end of the filament is similarly connected to a fixed contact 25.

In Figure 3, near the light bulb 33, the conductor wires 2 from the left and right
The low resistance and capacitor connecting 9 are a contact protection circuit 3 that prevents the contacts from being worn out by sparks.
It is 5.

Since this embodiment is constructed as described in detail above, the signal is actually emitted when the upper surface of the face plate 5 is magnetized, and it can be operated unmanned or fully automatically under computer control. The above-mentioned signals can be used to detect abnormalities in work, and can be used to stop work completely, send alarms, etc., and have the effect of preventing unexpected damage.

In the embodiment of the present invention, the case where magnetization is detected has been described, but it goes without saying that detecting non-magnetization is also included in the technical idea of the present invention.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration, and as is clear from the description, the reed switch embedded in the magnetic chuck The lid is pressed and biased, and a magnetic shielding plate is provided on the surface where the reed switch corresponds to the frame. Therefore,
It is not affected by the magnetism on the frame side, and operates accurately only when the magnetic chuck is in the ON state.

Note that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate changes.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional square electromagnetic chuck.
2 is a perspective view of a conventional rectangular permanent magnetic chuck, FIG. 3 is a plan view of an embodiment of the device of the present invention with the lid 17 removed, and FIG. 4 is the same as that shown in FIG. 3 with the lid 17 removed. It is a cross-sectional view taken along the arrows as it is attached. Explanation of symbols representing main parts in the drawings, 1...
Square electromagnetic chuck, 3...face plate, 5...1 magnetic pole plate,
7...Other magnetic pole plates, 11...Square permanent magnetic chuck, 1
3... Lever, 15... Frame part, 17... Lid part,
19... Reed switch, 23... Magnetic shielding plate.

Claims (1)

[Scope of utility model registration request] A part of the magnetic pole plate 5 of the magnet chuck is divided into a frame portion 15 and a cover portion 17, and the reed switch 1 is disposed in a recess formed in the frame portion 15.
a magnetic shielding plate (23) is provided on a surface of said reed switch (19) facing said casing portion (15).