JPH0344551Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vertical rail support device for a rail type universal parallel ruler, coordinate analyzer, etc., in which the vertical rail is biased by magnetic force.

In this kind of rail type flexible parallel ruler etc.
When the top and tail of the vertical rail are floated above the drawing board using magnetic force, if the magnet is supported by an aluminum frame and this frame is fixed to the drawing board, the weight of the vertical rail side will be applied to the frame. Therefore, the frame had to be constructed strongly, which resulted in a defect that made it expensive.

The main objective of the present invention is to eliminate the above-mentioned defects by fixing the magnet to the drawing plate which bears the weight of the vertical rail.

In a rail-type flexible parallel ruler, as the inclination angle of the drawing board changes, the vertical load of the vertical rail on the drawing board changes. Therefore, in conventional rail-type flexible parallel rulers in which the vertical rail is levitated by magnetic force, when the vertical load of the vertical rail to the drawing board changes, the vertical rail and the drawing board are suspended by the magnetic force acting between them. The spacing between the two plates changed significantly, resulting in the following defects. When the distance between the top of the rail and the drawing board changes, the horizontal cursor connected to the vertical bracket provided at the top of the vertical rail becomes tilted with respect to the vertical rail, and the horizontal cursor becomes rotatably supported by the horizontal cursor. If the parallelism between the surface of the horizontal roller for preventing lateral runout and the vertical rail surface of the vertical rail is lost, and the support mechanism of the horizontal roller does not have a relief action, the surface of the horizontal roller will become parallel to the vertical rail surface. It tilts. This increases the contact pressure between the horizontal rollers and the vertical rail surface, causing twisting force on the horizontal rollers and making the movement of the horizontal cursor heavier. Furthermore, as the horizontal cursor tilts, a large pressure is applied to the horizontal rollers that contact the vertical rail surface, so an escape mechanism must be provided to escape from this pressure, and the amount of relief of the relief mechanism must be increased. It existed. Furthermore, the permissible movement range of the vertical safety roller on the side of the horizontal cursor facing the horizontal rail surface of the horizontal rail must also be set large, resulting in a defect that the width of the horizontal rail in the thickness direction becomes wide. In addition, if the tail of the vertical rail changes significantly in the direction of approaching and separating from the drawing surface, the parallelism of the vertical rail to the drawing surface will be lost, and this will cause the vertical scale to deteriorate in its adhesion to the drawing surface. It is. As above,
When the magnetic levitation distance of the vertical rail relative to the drawing board changes greatly due to changes in the load applied to the vertical rail in a direction perpendicular to the drawing board, various defects occur. Therefore, the present invention attempts to eliminate the above-mentioned defects by arranging a plurality of magnets in parallel at each end of the vertical rail and the opposing portion of the drawing board. This is due to the following reasons.

As shown in Figure 3, if the vertical axis is the repulsive force and the horizontal axis is the gap between the opposing magnets MU and MB, then the magnet
The MUs are arranged in 8 rows in parallel so that different poles are adjacent to each other, the magnets MB are arranged in 8 rows in parallel so that different poles are adjacent to each other, and the magnets MU and MB are arranged in parallel with the same poles facing each other. In this case, the gap-repulsion force characteristic is curve C. D is a characteristic curve for 6 columns, E is a characteristic curve for 4 columns, and F is a characteristic curve for 2 columns. As is clear from the above characteristic diagram, as the number of rows of magnets increases and the number of magnetic poles increases, the curve of the characteristic curve becomes steeper. That is, although the repulsive force is large, the attenuation of the repulsive force is also significant as the gap widens. This means that the magnet MU should be
When changing from a state in which a predetermined load is applied such that MU does not touch magnet MB to a direction in which this load is reduced, the change in the gap between magnet MU and magnet MB is equal to the number of rows of magnets MU and MB, respectively. We reach the conclusion that the larger the number, the smaller the number. This conclusion can also be drawn from the magnetic flux density distribution characteristic diagrams showing test defects using a Gaussmeter in FIGS. 4 to 7. In the figure, the horizontal axis shows the width of the magnet, the vertical axis shows the axial flux density, and the
The number 015678 indicates the distance from the magnetic pole surface.
Figure 4 shows the characteristics when magnets are arranged in two rows in parallel so that different poles are adjacent to each other, and Figure 5 shows the characteristics when magnets are arranged in two rows in parallel so that different poles are adjacent to each other.
FIG. 6 shows a characteristic diagram of magnets arranged in six rows, and FIG. 7 shows a characteristic diagram of magnets arranged in eight rows. As is clear from this figure, the magnetic flux density attenuates as it moves away from the magnetic pole face, and when there are many rows of magnets, the attenuation is more significant than when there are fewer rows of magnets. Therefore,
If the number of rows of magnets is increased, if one of the magnets is levitated relative to the other magnet by repulsive magnetic force, when the load applied to one of the magnets towards the other magnet changes from the maximum value to the minimum value. , in order to reduce the change in the opposing gap between the pair of magnets, it is sufficient to increase the number of rows of magnets in the parallel direction.

The idea of using a plurality of magnets is based on the above idea.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a drawing board made of wood, resin, or paper core, and a plurality of band-shaped magnets 4 are fixed in the transverse direction over the entire upper surface of this drawing board. An appropriate range A on the upper edge of the drawing board 2 and an appropriate range B on the lower edge of the drawing board 2 constitute a strong magnetic field. The upper surface of the drawing board 2 within the range A is set low with an appropriate level difference with respect to other planes, and a plurality of strip-shaped magnets 10 are opposed to the magnets 4 within the range A. The magnet 10 is attached to the lower surface of the projecting piece 8 of the bracket 6 fixed to the upper part of the vertical rail 14 of the rail type flexible parallel ruler.
is permanently installed. The weight of the upper part of the vertical rail 14 is supported by the repulsive magnetic force acting between the magnet 10 and the magnet 4 in area A. 20 is a horizontal rail, and the drawing board 2 is attached via a vise-type fixture 22.
It is fixed to the side of the upper edge. Said horizontal rail 20
A horizontal cursor 24 is movably connected to the horizontal cursor 24 via rollers, and the bracket 6 is rotatably supported by a shaft 26 at the rising portion of the horizontal cursor 24.
A magnet (not shown) fixed to the tail of the vertical rail 14 is placed in the magnetic field within the range B of the lower edge of the drawing board 2 so that it is repelled in the direction of floating from the drawing board 2 surface. It faces the magnet 4 of.

In the above configuration, when the vertical rail 14 is moved along the horizontal rail 20, the magnet 10 moves along the magnet 4 while being levitated by the magnetic force relative to the magnet 4. Further, the magnet provided at the tail of the vertical rail 14 also moves along the magnet 4 within the range B of the drawing board 2 while floating above the drawing board 2 surface.

As mentioned above, in the present invention, the magnets that bear the weight of the vertical rails are fixed to the drawing board, so there is no need to use a strong frame to hold the magnets, and therefore the magnetic levitation mechanism can be constructed at low cost. There is an effect.

Furthermore, the present invention has the magnet fixed integrally on the upper surface of the drawing board edge at a height below the drawing board plane, so when the scale is rotated, the scale does not collide with the magnet surface and the magnet surface does not get in the way. exists.

Further, there is an effect that it is possible to reduce changes in the facing distance between the vertical rail and the drawing board surface due to the magnetic force of the magnets, which is caused by changes in the load applied perpendicularly to the drawing board surface of the vertical rail.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, in which Fig. 1 is a side cross-sectional view, Fig. 2 is a plan view, Fig. 3 is a gap-repulsion characteristic diagram of magnets, and Fig. 4 is a graph showing the case of two magnets. Magnetic flux density distribution characteristic diagram. Figure 5 is a magnetic flux density distribution characteristic diagram for 4 magnets. Figure 6 is a magnetic flux density distribution characteristic diagram for 6 magnets. Figure 7 is magnetic flux density distribution diagram for 8 magnets. It is a distribution characteristic diagram. 2...Drawing board, 4...Magnet, 10...Magnet, 14
... Vertical rail, 20 ... Horizontal rail, 22 ... Vise type fixture, 24 ... Horizontal cursor, 6 ... Bracket, 26 ... Axis.

Claims (1)

[Scope of utility model registration request] In a rail-type flexible parallel ruler, etc., in which the end of the vertical rail is biased in the direction of floating with respect to the drawing board by magnetic force, the movement of a plurality of strip-shaped magnets arranged at the end of the vertical rail A plurality of strip-shaped magnets are integrally fixed to the upper surface of the edge of the drawing board at a height below the plane of the drawing board, and are located below the route, and the plurality of strip-shaped magnets and the plurality of magnets on the vertical rail side are integrally fixed. A vertical rail support device characterized in that a repulsive force is exerted between the belt-shaped magnet and the vertical rail support device.