JPS5927602Y2 - magnet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnet suitable for use in printing hammers, tape punchers, and the like.

Conventionally, this type of magnet 1, as shown in FIG.
Slide shaft 3 driven by plunger 2
is slidably supported by a guide 6.6 provided on the stator 5, the eccentricity of the stator 5 and the guide 6 and the fit between them, the eccentricity of the slide shaft 3 and the plunger 2, and the fit between them. The air gap 7, which is the magnetic gap between the plunger 2 and the stator 5, is not uniform due to the influence of misalignment, etc., causing an imbalance in the driving force of the shaft 3 acting on the plunger 2, and as a result, the slide shaft 3 and the There was a drawback that the guides 6 rubbed against each other strongly and the efficiency of the magnet 1 deteriorated.

In addition, in order to eliminate the negative effects caused by the non-uniformity of the air gap 7, a method is known in which the gap 7 is made larger to some extent in advance, but this naturally increases the size of the excitation coil 9 and therefore the entire magnet 1. Otherwise, there was a problem that the magnetic efficiency decreased.

Therefore, the present invention provides a guide section on the slide shaft, so that the slide shaft can directly slide on the inner cylinder section, and a certain magnetic gap between the plunger and the sliding surface of the guide section. It is an object of the present invention to provide a magnet which is formed and provided in one piece, thereby eliminating the above-mentioned drawbacks.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

As shown in FIG. 1, the magnet 1 has a stator 5 made of a ferromagnetic material, and the stator 5 is formed from an inner cylinder part 5a and an outer cylinder part 5b.

An excitation coil 9 is wound in a cylindrical shape between the inner cylinder part 5a and the outer cylinder part 5b, and a notch 5C is formed approximately in the center of the inner cylinder part 5a.
is formed around the entire circumference.

A slide shaft 3 made of a non-magnetic material is provided in the inner cylinder portion 5a.
are fitted and secured to be slidable in the directions of arrows A and B via the guide portions 3 a and 3 a, and the tip 3C of the slide shaft 3 projects outward from the hole 5d of the stator 5.

A coil spring 1 is installed between the stator 5 and the slide shaft 3.
0 is compressed to cover the shaft 3, and the coil spring 10 always biases the shaft 3 in the direction of arrow B.

A plunger 2 made of a ferromagnetic material is fitted between the guide parts 3a, 3a of the shaft 3, and the plunger 2 is smaller than the sliding surfaces 3b, 3b of the guide parts 3a, 3a by an air gap of 7 minutes. It is formed to a diameter of

Note that a stopper 11 is fitted to the right end in the figure of the inner cylinder portion 5a.

Since the present invention has the above configuration, when assembling the magnet 1, the inner cylindrical portion 5a of the stator 5,
The slide shaft 3 with the plunger 2 attached thereto is inserted and engaged via the guide portion 3a.

Then, since the plunger 2 is formed to have a smaller diameter than the sliding surface 3b of the guide portion 3a by the amount of the air gap 7, the air gap 7 between the inner cylinder portion 5a and the plunger 2 immediately becomes uniform. formed in shape.

In the magnet 1 assembled in this way, in a normal state, the slide shaft 3 is pressed in the direction of arrow B by the elasticity of the coil spring 10, and the right end of the shaft 3 is maintained in contact with the stopper 11.

Next, when a current is applied to the excitation coil 9 to excite the coil 9, the magnetic flux of the coil 9 is transferred to the inner and outer cylindrical portions 5 a of the stator 5,
5 b.

However, the magnetic flux passing through the inner cylinder portion 5a passes through the plunger 2 due to the presence of the notch 5C, and the plunger 2 receives a driving force in the direction of arrow A.

Then, the slide shaft 3 moves the stator inner cylinder part 5a together with the plunger 2 against the coil spring 10.
It moves in the direction of arrow A while being guided by the guide part 3a,
Performs predetermined printing operations, etc.

At this time, since a uniform air gap 7 is formed between the plunger 2 and the inner cylinder part 5a, the plunger 2
Therefore, the driving force acting on the shaft 3 in the A direction becomes uniform over the entire circumference of the shaft 3, and the shaft 3 is strongly driven in the A direction without the sliding surfaces 3b of the inner cylinder part 5a and the guide part 3a rubbing against each other. be done.

When the printing operation, etc. is completed, when the current flowing through the coil 9 is cut off, the magnetic flux caused by the coil 9 disappears, and therefore the force acting on the plunger 2 in the A direction also disappears.
The slide shaft 3 moves in the B direction by the elasticity of the coil spring 10 until its right end abuts against the stopper 11.

Note that in the above embodiment, the guide portion 3a is connected to the plunger 2.
Although the case has been described in which the guide portions 3a are formed at two locations sandwiching the guide portions 3a, the number of guide portions 3a is not necessarily limited to two locations, and it goes without saying that the guide portions 3a may be formed at one or more locations.

However, if the guide portion 3a is formed to sandwich the plunger 2, the amount of deflection of the portion of the shaft 3 corresponding to the plunger 2 will be reduced, making it possible to make the air gap 7 more uniform. becomes.

Furthermore, as shown in FIG. 2, the plunger 2 is embedded and integrally formed within the guide portion a, and a magnetic gap corresponding to the air gap 7 is formed with a uniform thickness by the guide portion 3a. Of course, it is possible.

As explained above, according to the present invention, since the slide shaft 3 slides directly in the inner cylinder part 5a of the stator 5, there is no need to use the guide 6 etc. as in the conventional case, and the air Non-uniformity in the magnetic gaps such as the gap 7 can be eliminated, which not only makes it possible to improve the efficiency of the magnet 1, but also simplifies the assembly work of the magnet 1 by reducing the number of parts. can.

Furthermore, by making the magnetic gap uniform, the gap can be made smaller than before, which contributes to reducing the size and weight of the entire magnet 1.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing one embodiment of the magnet according to the present invention, Fig. 2 is a front sectional view showing main parts of another embodiment of the invention, and Fig. 3 is a front sectional view showing a conventional magnet. It is a diagram. 1...Magnet, 2...Plunger, 3...Slide shaft, 3a...
・Guide part, 3b... Sliding surface, 5...
Stator, 5a...Inner cylinder part, 5b...
- Outer cylinder part, 5C...notch, 7...magnetic gap (air gap), 9...excitation coil.

Claims (1)

[Scope of utility model registration request] The stator is made of a magnetic material and has an inner cylinder part and an outer cylinder part in which a notch is formed over the entire circumference, and an excitation coil is provided between the inner cylinder part and the outer cylinder part, and In the magnet, a slide shaft made of a non-magnetic material is movably provided on the magnet, a plunger made of a magnetic material is provided on the shaft, and the plunger is driven in a predetermined direction together with the slide shaft by exciting an excitation coil. A guide portion is provided on the slide shaft, and the plunger is integrally provided with a fixed magnetic gap from the sliding surface of the guide portion so that the slide shaft can directly slide on the inner cylinder portion. A magnet characterized by: