JPH0128717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical rail upper end guide device for a rail type universal parallel ruler.

In a rail-type flexible parallel ruler, each time the inclination angle of the drawing board changes, the load of a lateral moving body connected to the upper end of the vertical rail in a direction perpendicular to the drawing board surface changes with respect to the horizontal rail. Therefore, when the load on the horizontal rail on the side of the horizontal moving body changes, a rail-type flexible parallel ruler that levitates the horizontal moving body against the horizontal rail by the magnetic force acts between the horizontal moving body and the horizontal rail. The facing distance from the rail changes significantly. As a result, a magnetic force is applied to the lateral moving body in a direction that is inclined with respect to the horizontal rail, and the surface of the lateral vibration prevention roller that is rotatably supported on the lateral moving body side and the vertical rail surface of the lateral rail are If the parallelism between the horizontal rollers and the vertical rail surface collapses, and there is no relief action between the horizontal rollers and the vertical rail surface, that is, there is no relief action in the horizontal vibration control mechanism, the contact pressure between the horizontal rollers and the vertical rail surface will increase, causing the horizontal rollers to twist. A force is generated and the movement of the lateral moving body becomes heavier. In addition, in order to prevent large pressure from being applied to the horizontal rollers that contact the vertical rail surface due to the magnetic force applied to the horizontal moving body in the direction of inclination, an escape mechanism must be provided in the horizontal vibration control mechanism to escape from this pressure. Naturally, the mechanism becomes complicated, and it is necessary to increase the amount of relief of the relief mechanism. In addition, in order to prevent the lateral moving body side from contacting the lateral rail side due to downward external stress perpendicular to the drawing surface, if a safety roller is provided on the lateral moving body side, this safety roller should be The safety roller will be placed opposite the horizontal rail surface at a predetermined distance, but the permissible vertical movement range of this safety roller relative to the horizontal rail surface must also be set large, and the width in the thickness direction of the horizontal rail must be set large. This results in a defect that the horizontal rail cannot be made smaller and lighter. In addition, if the upper end of the vertical rail changes significantly in the direction of contacting and separating from the drawing surface, the vertical rail will tilt with respect to the drawing surface, which will deteriorate the adhesion of the vertical straightedge to the drawing surface. This is the cause of this.

As described above, when the magnetic levitation distance of the upper end of the vertical rail relative to the drawing surface changes greatly due to a change in the load applied to the horizontal moving body connected to the upper end of the vertical rail in a downward vertical direction with respect to the horizontal rail, various types of Defects occur. Therefore, an object of the present invention is to eliminate all of the above-mentioned defects by arranging multiple rows of magnetic pole strips in which mutually different poles are adjacent to each other in parallel on the side facing the lateral moving body and the lateral rail. . The above object is achieved for the following reasons.

As shown in FIG. 7, upper and lower opposing magnets 2 and 4
If the width and magnetic force of each are constant, the vertical axis is the repulsive force, and the horizontal axis is the gap between the opposing magnets 2 and 4, then the magnets 2 are arranged in 8 rows in parallel so that different poles are adjacent to each other. When the magnets 4 are arranged in eight rows in parallel so that different poles are adjacent to each other, and the magnets 2 and 4 are arranged with the same poles facing each other, the gap-repulsion force characteristic becomes curve 6. 8 is the characteristic curve for 6 rows, 1
0 is the characteristic curve for 4 columns, and 12 is the 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 when a predetermined load is applied downward to the magnet 2 to the extent that the magnet 2 does not touch the magnet 4, when this load is changed in a direction to reduce the load, the gap between the magnet 2 and the magnet 4 changes. reaches the conclusion that the larger the number of rows of magnets 2 and 4, the smaller the number of rows.

This conclusion can also be drawn from the magnetic flux density distribution characteristic diagrams showing test results using a Gaussmeter shown in FIGS. 8 to 11. In the figure, the horizontal axis shows the width of the magnet, the vertical axis shows the magnetic flux density, and the number 015678 attached to the characteristic curve shows the distance from the magnetic pole surface. Figure 8 shows two magnets arranged so that different poles are adjacent to each other.
Figure 9 shows a characteristic diagram when magnets are arranged in four rows;
The figure shows a characteristic diagram with magnets arranged in six rows, and FIG. 11 shows a characteristic diagram with 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, when one of the magnets is levitated relative to the other magnet by repulsive magnetic force, the load applied to one of the magnets toward the other magnet will increase from the maximum value to the minimum value. In order to reduce the change in the opposing gap between the pair of magnets when the magnets change, the number of rows of magnets should be increased in the parallel direction.

The present invention is based on the above idea, and the configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

14 is a drawing board, 16 is a horizontal rail fixed to the upper edge of the drawing board 14, and as shown in FIG. 6, horizontal rail surfaces 18, 20 and vertical rail surfaces 22, 24 are formed along the longitudinal direction. has been done. Reference numeral 26 denotes a plate member, and a bracket 28 is rotatably supported on a rising portion of this plate member by a shaft 30, which is rotatable about an axis parallel to the horizontal rail 16. Said plate member 26
The bracket 28 constitutes a lateral moving body 32 that is movable along the lateral rail 16. Said plate member 2
6 has vertical rollers 34, horizontal rollers 36, 38,
A safety roller 40 is rotatably supported.
The vertical rollers 34 rotatably contact the horizontal rail surface 18, the horizontal rollers 36 and 38 rotatably contact the vertical rail surfaces 22 and 24, and the safety roller 40 responds to the repulsive force of magnets 42 and 44, which will be described later. Therefore, it floats with a slight distance from the horizontal rail surface 20. A magnet 42 made of a plurality of elongated magnetic rubbers with a square cross section is fixed to the horizontal rail 16. On the externally exposed surface of the magnet 42, a plurality of parallel rows of magnetic pole bands are formed in the order of NSNS from the left in FIG. 6, extending in the direction perpendicular to the paper plane in FIG. The upper end of a vertical rail 46 is fixed to the upper part of the bracket 28. 4
Reference numeral 4 denotes a magnet having the same structure as the magnet 42 fixedly installed on the lower surface side of the horizontal tongue piece of the bracket 28, and the plurality of rows of magnetic pole strips formed on the externally exposed surface of the magnet 44 are the same as the magnetic pole strips of the magnet 42. The homopolar planes are opposite. Due to the repulsive magnetic force between the magnets 42 and 44, the upper end side of the vertical rail 46 is completely levitated with respect to the surface of the drawing board 14. In FIG. 2, reference numeral 48 denotes a vertical cursor that is movably attached to the vertical rail 46 via rollers.
2 are connected. A horizontal straight ruler 54 and a vertical straight ruler 56 are detachably fixed to the mounting plate of the head 52. In FIG. 4, 58 is a cover fixed to the lower part of the vertical rail 46, a frame 60 is fixed to this, and the shafts of screws 62 and 64 are screwed into screw holes drilled in the frame 60. The elongated hole 6 of the adjusting plate 66
8 and 70 are slidably fitted together. Reference numeral 72 denotes a support frame fixed to the adjustment plate 66 by screws 74 so as to be able to be finely adjusted in a direction perpendicular to the surface of the drawing board 14. The right end of the horizontal part of this frame in the top right of FIG. 4 is connected to the vertical rail. The head 52 protrudes in a direction perpendicular to the head 52 mounting side with respect to the head 46 . Numeral 76 denotes a magnet made of a plurality of flexible magnetic rubbers with a square cross section, which are fitted into grooves formed in the horizontal portion, and which are arranged parallel to the horizontal rail 16. 4, the left end is located directly below the left side of the vertical rail 46, and the right end of the magnet 76 is located directly below the left side of the vertical rail 46.
It is separated from the right side surface by a predetermined distance to the right. 7
Reference numeral 8 denotes a fixed rail fixed to the lower edge of the drawing board 14 so as to be parallel to the horizontal rail 16, and a plurality of elongated magnetic rubbers with square cross sections are inserted into grooves formed on the upper surface of the fixed rail. A magnet 80 consisting of the two is arranged to fit together. The magnets 80 and 76 face each other with a predetermined distance between the same polar faces due to the repulsive force acting between them. 82 is safety color,
The roller 8 is rotatably supported by the support frame 72.
The surface of rail 78 is slightly raised relative to the surface of rail 78 due to the repulsive magnetic force of magnets 76 and 80.

In addition, loosen the screws 62 and 64 and adjust the adjustment plate 66.
The magnet 7 slides along the longitudinal direction of the vertical rail 46.
The magnetic pole face of the magnet 80 can be precisely adjusted to a position where the same poles face each other. After making the above fine adjustment, the adjusting plate 66 is fixed to the frame 60 by tightening the screws 62 and 64. Note that any mechanism may be used for the head floating mechanism 50 when implementing the present invention.

Next, the operation of this embodiment will be explained.

When the handle of the head 52 is grasped by hand and force is applied to it in an arbitrary direction parallel to the surface of the drawing board 14, the horizontal moving body 32 moves along the horizontal rail 16, and the vertical cursor 48 moves along the vertical rail 46. can move the head 52 in a desired direction.

When the vertical rail 46 moves horizontally on the drawing board 14 in FIG.
Due to the repulsive magnetic force between 4 and 76 and 80, drawing board 1
It floats completely on all four sides, allowing it to move lightly and smoothly. When the drawing board 14 is tilted from a horizontal state to an upright direction, for example, at an angle of 80 degrees with respect to the floor surface, the drawing board 1
4 is horizontal, the load applied to the bracket 28 in the direction perpendicular to the plane of the drawing board 14 is greatly reduced. However, the opposing distance between the magnetic pole surface on the side of the horizontal rail 16 and the magnetic pole surface on the bracket 28 side does not widen greatly in response to the reduction of the load, and the change is slight. This is because the magnetic pole surface is composed of multiple rows of parallel magnetic pole strips.

Therefore, in the plate member 26, the bracket 28 is attached to the drawing board 1.
Vertical roller 34 even if it changes upward with respect to the 4th surface
Since the horizontal rollers 36 and 38 are only slightly inclined in the counterclockwise direction in FIG.
This can be maintained by the play between the rollers 6, 38 and the shaft supporting them, so that the surfaces of the horizontal rollers 36, 38 are not inclined with respect to the vertical rail surface.
Furthermore, the rise of the safety roller 40 relative to the horizontal rail surface due to the rising of the drawing board 14 is also very small. Also,
Since the rise of the upper part of the vertical rail 46 with respect to the surface of the drawing board 14 due to the rising of the drawing board 14 is also small, the vertical rail 4
There is no significant change in the parallelism of 6 to the 14th surface of the drawing board.

Since the present invention is configured as described above, with respect to the drawing surface of the horizontal rail on the upper end side of the vertical rail,
It is possible to reduce the change in the facing distance between the magnets on the side of the lateral moving body and the magnets on the side of the lateral rail due to changes in the load in the substantially vertical direction, and there is an effect that the object described at the beginning can be achieved.

[Brief explanation of drawings]

Figure 1 is an overall plan view, Figure 2 is a side view, Figure 3 is an explanatory diagram of the operation, Figure 4 is a front view, Figure 5 is a side view, Figure 6 is a side view, Figure 7 is a diagram of the magnet. Gap-repulsion force characteristic diagram, Figure 8 is a magnetic flux density distribution characteristic diagram for two magnets, Figure 9 is a magnetic flux density distribution characteristic diagram for four magnets, and Figure 10 is magnetic flux for six magnets. Density distribution characteristic diagram, FIG. 11 is a magnetic flux density distribution characteristic diagram in the case of eight magnets. 14...Drawing board, 16...Horizontal rail, 18,20
... Horizontal rail surface, 22, 24 ... Vertical rail surface, 26 ... Plate member, 28 ... Bracket, 30
... Axis, 32 ... Horizontal moving body, 34 ... Vertical roller, 36, 38 ... Horizontal roller, 40 ... Safety roller, 42, 44 ... Magnet, 46 ... Vertical rail, 48 ... Vertical cursor, 52...Head, 5
4,56...Straight ruler.

Claims (1)

[Claims] 1. A drawing board 14, a horizontal rail 16 disposed on the upper edge of the drawing board 14, and a lateral mover arranged movably and regulated to move along the longitudinal direction of the horizontal rail 16. a vertical rail 46 whose upper end is connected to the horizontal moving body 32, a vertical cursor 48 attached to the vertical rail 46 so as to be movable along it, and a head 52 attached to the vertical cursor 48. In the rail type flexible parallel ruler, a plurality of rows of magnetic pole strips having mutually different polarities are arranged in parallel on the side of the horizontal rail 16 such that the direction of the rows is parallel to the moving direction of the horizontal moving body 32. On the other hand, a plurality of rows of magnetic pole strips are arranged on the side of the lateral moving body 32 so that the same poles as the magnetic pole strips face each other,
The side of the horizontal rail 16 facing each other and the horizontal moving body 3
The upper end portion of the vertical rail is characterized in that the load on the upper end side of the vertical rail 46 in a direction substantially perpendicular to the surface of the drawing board 14 due to its weight is supported by the repulsive magnetic force acting between the magnetic pole strips on the two sides. Guidance device.