JPH0119170Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a reversible display device.

Conventionally, there is a reversible display device in which a cylindrical rotating body whose surface is divided into two colors is used as segments, and these segments are arranged in a Japanese character shape, and the desired segments are selected and combined to display numbers, etc. .

The rotation driving means for each display segment is such that a magnet is provided inside each segment, and the magnet is driven from outside the segment by an electromagnetic device to reverse the segment. However, since an electromagnetic device is disposed outside each drum, it is difficult to install it outdoors such as in a stadium, the device cannot be miniaturized, and it has the disadvantage that it is prone to failure due to adhesion of dust.

Therefore, as a conventional improvement technique, a display segment (rotating body) is rotatably attached to a pipe-shaped fixed shaft, an electromagnet is installed inside this segment, and two permanent magnets are installed inside the segment. There was one in which a lead wire connected to an electromagnetic coil was inserted into the inside of the fixed shaft and taken out to the outside of the segment (for example, Japanese Utility Model Publication No. 43-6170).

However, with this improved technology, it is necessary to connect the lead wire to the coil, and it is also necessary to insert the lead wire through the pipe-shaped fixed shaft, which complicates assembly work and makes maintenance and inspection of the device difficult. However, when replacing the electromagnet, the entire lead wire must be replaced.

Therefore, the purpose of the present invention is to provide a reversible display device that does not require lead wires to electrically connect the excitation coil of the electromagnet device to the drive control circuit, making assembly work extremely easy and quick. It's about doing.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, on the mounting plate 1,
Two support columns 2, 2 are erected, and a fixed shaft 3 is installed between the two support columns. Fixed axis 3
is constructed by coaxially connecting two conductive bars 3a and 3b with an insulating connecting member 3c, and this connecting member includes an iron core 4 and an excitation wire wound around the iron core. An electromagnetic device A consisting of a coil 5 is fixed. One end 5a of the excitation coil 5 is connected to the left bar 3a, and the other end 5b is connected to the right bar 3b, and this coil is connected to the conductive bars 3a, 3.
b. It is connected to a drive control circuit (not shown) via the support columns 2, 2.

The rotating body 6 is rotatably supported with respect to the fixed shaft 3, and this rotating body has bodies 6a and 6b divided into two in a direction orthogonal to the axial direction, which are joined together at a joint surface H. It is something. Each body 6a, 6b
One end is drawn into a conical shape, and self-aligning bearings 7, 7 are provided at the tip.
A magnetic shield ring 9 made of a magnetic material such as iron is fitted and fixed on the outer peripheral surface of the annular permanent magnet 8. Then, the electromagnet device A is placed in the hollow part of the permanent magnet 8.
The outer circumferential surface of the magnetic shield ring 9 is fixed to the inner circumferential surface of the rotating body 6 via an adhesive in a positional relationship that envelops the magnetic shield ring 9 . Further, a part of the joint surface end of at least one of the bodies 6a and 6b (for example, 6b) is cut out, and the engagement piece 10 is integrally bent vertically. The engagement piece 10 can engage with stoppers 11, 11 located on both sides of the rotating body 6, and the rotation angle of the rotating body 6 is regulated by the stoppers. At the tips of the stoppers 11, 11,
By inserting elastic members 12, 12, the impact sound at the time of contact with the engaging piece 10 is made gentle. The front end of the rotating body 6 is exposed to the outside through the opening of the mask plate 13.

Next, the operation of the present invention will be explained.

In the state shown by the solid line in FIG. 2, a drive signal that excites the upper end of the iron core 4 to the north pole and the lower end to the south pole is transmitted by the drive control circuit to the conductive rods 3a of the support columns 2, 2 and the fixed shaft 3. , 3b to the coil 5, the permanent magnet 8 receives a clockwise rotational force due to repulsion and attraction, and the rotating body 6 is rotated so that the engagement piece 10 is on the left side as shown by the chain line. It is reversed to the position where it contacts the stopper 11. Then, when the next reversal drive signal is supplied to the coil 5 and the iron core 4 is excited to the opposite polarity, the rotating body 6 similarly reverses counterclockwise and returns to the solid line state. Similarly below,
Every time a driving member is applied to the coil 54 via the support columns 2, 2 and the conductive bars 3a, 3b, the rotating body 6 performs the same reversal operation as described above. Although the permanent magnet 8 is annular, it is not limited to this shape.

As explained above, according to the present invention, the excitation coil of the electromagnetic device is directly connected to the conductive bar of the fixed shaft, so there is no need for lead wires, and therefore the assembly work of the device is easy and The practical effects are truly significant, as it can be done quickly and the electromagnet device can be easily replaced during maintenance and inspection.

[Brief explanation of the drawing]

Figure 1 is a central sectional view of one embodiment of the present invention;
The figure is a sectional view taken along the line of FIG. A ...Electromagnetic device, 3...Fixed shaft, 3a, 3b
...Conductive bar material, 3c...Insulating connection member, 6...
...Rotating body, 8...Permanent magnet.

Claims (1)

[Claims for Utility Model Registration] A fixed shaft formed by coaxially connecting two conductive bars with an insulating connecting member, and a rotating body rotatably supported by the fixed shaft. and a permanent magnet fixedly disposed in the rotating body with respect to the rotating body, and fixed to the insulating connecting member in a position opposite to the permanent magnet and connected via both the conductive bars. A reversible display device comprising an electromagnetic device for rotationally driving the rotating body, which is supplied with electricity.