JPH0121713Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a magnetic chuck with an indicator light.

Conventionally, magnetic chucks are known, for example, in the form shown in FIG. This kind of magnetic chuck is
A chuck body 1 with a built-in coil and iron core,
The magnetic pole plate 2 has a plurality of magnetic poles, and the lines of magnetic force generated by applying power to the coil generate an adsorption force on the magnetic pole plate 2, and the workpiece is fixed on the magnetic pole plate 2 by adsorption, and the workpiece is ground. Used for work, etc.

However, with this type of magnetic chuck, even if power is applied to the coil, the magnetic pole plate 2 may not have any adhesion force due to a disconnection of the coil. If grinding work is performed on a workpiece that has been removed, there is a risk that unexpected harm may be caused to the worker. Therefore, even after turning on the power to the coil, in order to ensure the safety of grinding work, the operator must move the workpiece installed on the magnetic pole plate to check for the generation of invisible magnetic lines of force. I had to check the details one by one, which caused me some disadvantages and inconveniences.

This invention was made in view of the above-mentioned drawbacks of the prior art, and the object is to provide a magnetic chuck that is easy to confirm whether or not magnetic lines of force are generated and is superior in safety.

To achieve this objective, this invention adds an indicator light to the chuck section, and the indicator light is turned on only when current is flowing through the coil.

An embodiment of this invention will be described below based on the accompanying drawings.

FIG. 2 is a partially cutaway perspective view of the magnetic chuck according to this embodiment. The chuck portion which is this magnetic chuck consists of a chuck body 10 and a magnetic pole plate 2.
0.

Here, the chuck body 10 has a rectangular shape,
It includes a coil 11 and an iron core 12. An indicator light 13 and a terminal 14 for connecting a lead wire are provided on the side surface of the chuck body 10, respectively.
On the other hand, a magnetic pole plate 20 is fixed to the upper end of the chuck body 10. This magnetic pole plate 20 includes a separator 21
A plurality of magnetic poles 22 are arranged,
The magnetic pole 22 is connected to the iron core 12 to form N and S poles.

FIG. 3A is an enlarged sectional view taken along the line A--A in FIG. 2, with a portion omitted, showing the detailed structure of the indicator light 13 attached to the side surface of the chuck body 10. As the indicator light 13, a pilot lamp, a light emitting diode (LED), or the like is used, for example, and is embedded in a hole 15 provided in the side surface of the chuck body 10 via a sealing material. In addition, this indicator light 13
It is also possible to embed the box 16 in the side surface of the magnetic pole plate 20, or, as shown in FIG. It is.

FIG. 4 is a wiring diagram of the magnetic chuck.
The coil 11 of this magnetic chuck is connected to a terminal 14 attached to the side surface of the chuck body 10, and an indicator light 13 is connected in parallel to the coil 11 to an intermediate tap provided on the coil 11.
Further, on the power supply side of the terminal 14, there is a switch 30 capable of reverse excitation for turning on and off the magnetic chuck, and a rectifier 31 for converting the AC power supply to DC.
are connected. Therefore, when the switch 30 is turned on, the DC voltage exchanged by the rectifier 31 is applied to the coil 11 via the terminal 14,
Therefore, lines of magnetic force are generated via the iron core 12 and the magnetic pole 21, and an attractive force is generated on the magnetic pole plate 20. At this time, since the indicator light 13 is connected in parallel to the coil 11, it lights up at the same time as the coil 11 is energized.On the other hand, if the current does not flow to the coil 11 due to a disconnection, etc., this indicator light 13 also lights up. do not. Therefore, the operator can easily and accurately check whether the magnetic pole plate 20 is attracting force by checking whether or not the indicator light 13 is lit, and can safely and quickly carry out subsequent grinding work, etc. can be done.

The magnetic chuck with an indicator light according to this invention is constructed as described above, so when a current flows through the coil, a magnetic force is generated due to the generation of magnetic lines of force, and the indicator light also lights up, so that the operator can be attracted to the chuck. By lighting up this indicator light, it is possible to easily and accurately confirm whether or not a force is being generated, which has the effect of allowing subsequent work to be carried out safely and quickly.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional magnetic chuck, FIG. 2 is a partially cutaway perspective view of a magnetic chuck according to an embodiment of the invention, and FIGS. 3A and 3B are cross-sectional views taken along line A-A in FIG. FIG. 4, an enlarged view with parts omitted, is a wiring diagram of the magnetic chuck shown in FIG. 2. 1, 10...chuck body, 2, 20...magnetic pole plate, 11...coil, 12...iron core, 13...indicator light, 22...magnetic pole.

Claims (1)

[Scope of utility model registration request] It includes an iron core, a coil wound around the core, a chuck portion that generates magnetic lines of force by switching a switch to generate an attractive force, and a pilot lamp provided in the chuck portion and connected in parallel with a portion of the coil. Magnetic chuck with indicator light.