JPS5831320B2 - Balance weight guide device for rail type flexible parallel ruler - Google Patents

Description

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

The main object of the present invention is to provide a rail-type flexible parallel ruler, in which magnets are placed on the bottom side of a weight insertion space formed in a vertical rail and on the opposing side of a balance weight that can freely travel therewith, so that the same polar surfaces face each other. In a device in which the balance weight is levitated relative to the bottom surface of the weight insertion space by the magnetic force of a magnet, the levitation distance of the balance weight relative to the bottom surface is such that the load change in the downward perpendicular direction relative to the bottom surface of the balance weight is The goal is to ensure that there are no major changes.

In a rail-type flexible parallel ruler, as the inclination angle of the drawing board changes, the downward vertical load of the balance weight on the bottom surface of the entire weight insertion area changes.

Therefore, if the balance weight is levitated by magnetic force against the bottom surface of the weight insertion space in order to lighten its movement, if the downward vertical load on the bottom surface of the weight insertion space changes, the gap between the two will change. The distance between the balance weight and the bottom surface of the entire weight insertion area changes greatly due to the magnetic force acting on the balance weight.

Therefore, when the balance weight changes up and down in this way, a drawback arises in that the storage space for the balance weight formed in the vertical rail must be widened.

Therefore, the present invention attempts to eliminate the above-mentioned defects by arranging a plurality of rows of magnetic pole strips in parallel at the opposing portions of the balance weight and the bottom side of the weight insertion space.

This is due to the following reasons.

As shown in FIG. 6, if 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. The magnets 4 are arranged in 8 rows in parallel so that different poles are adjacent to each other, and the magnets 2
The gap-repulsion force characteristic when the same poles of and 4 are made to face each other is curve 6.

8 is a characteristic curve for 6 columns, 10 is a characteristic curve for 4 columns, and 12 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 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 the test results using a Gaussmeter shown in FIGS. 7 to 11.

In the figure, the horizontal axis indicates the width of the magnet, the vertical axis indicates the magnetic flux density, and the number 015678 attached to the characteristic curve indicates the distance from the magnetic pole surface.

Figure 7 shows magnets arranged in two rows in parallel so that different poles are adjacent to each other.
Figure 8 shows the characteristic diagram when the magnets are arranged in four rows, Figure 9 shows the characteristic diagram when the magnets are arranged in six rows, and Figure 10 shows the characteristic diagram when the magnets are arranged in six rows. A characteristic diagram of the state in which they are arranged in eight rows is shown.

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 with respect to the other magnet by repulsive magnetic force, when the load applied to one of the magnets toward the other 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 parallel.

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.

Reference numeral 10 denotes a drawing board, which is attached to a drafting table so that it can be set at any inclination angle between an upright state substantially perpendicular to the floor surface and a horizontal state.

Reference numeral 12 denotes a horizontal rail fixed to the upper edge of the drawing board 10 by a vise-type fixture, and on the upper surface of this rail, eight magnets, that is, magnet rubbers 14 are arranged along the entire length so that different polarities are adjacent to each other. They are arranged in parallel.

16 is a horizontal cursor, and a plurality of horizontal rollers 18 rotatably supported by the horizontal cursor abut one surface of a pair of vertical rail surfaces formed along the longitudinal direction of the horizontal rail 12; One or more horizontal rollers 20 rotatably supported by the horizontal cursor 16 are in contact with the other of the vertical rail surfaces.

A plurality of vertical rollers 22 are rotatably supported by the horizontal cursor 16, and the surfaces thereof are in contact with a horizontal rail surface 24 formed on the horizontal rail 12.

Reference numeral 26 designates one or more safety rollers rotatably supported by the horizontal cursor 16, and facing the horizontal rail surface 28 of the horizontal rail 12 at an appropriate interval.

Reference numeral 30 denotes a vertical rail, to which a vertical bracket 32 is fixed, and the vertical bracket 32 is supported by a shaft 34 on the horizontal cursor 16 so as to be rotatable about an axis horizontal to the drawing board 10 surface.

Reference numeral 36 denotes a horizontal portion formed on the vertical bracket 32, on which eight magnetic rubbers 38 are arranged in parallel as shown in the figure so that different poles are adjacent to each other.

As shown in FIG. 2, the group of magnet rubbers 38 on the side of the bracket 32 and the group of magnet rubbers 14 on the side of the horizontal rail 12 have the same polar surfaces facing each other and a repulsive magnetic force acts on each other, and this repulsive magnetic force causes the vertical bracket 32 to It is floating relative to the horizontal rail 12.

In FIG. 3, reference numeral 40 denotes a fixed rail disposed along the entire length of the lower edge of the drawing board 10, and on the upper surface of this rail, five magnetic rubbers 4 are arranged in parallel so that different poles are adjacent to each other.
2 is permanently installed.

Reference numeral 44 denotes a mounting member fixed to the tail of the vertical rail 30, and five magnet rubbers 46 are attached in parallel so that different poles are adjacent to each other and the same pole faces face the group 42 of magnet rubbers. It is fixedly installed.

The tail portion of the vertical rail 30 floats relative to the fixed rail 40 due to the repulsive magnetic force acting between the magnet rubber 42 and the magnet rubber 46.

Reference numeral 48 denotes a safety roller rotatably supported by the mounting member 44, and faces the bottom surface of the fixed rail 40 with a slight gap therebetween.

In FIG. 4, reference numeral 50 denotes a weight insertion space formed over the entire length in the longitudinal direction of the vertical rail 30, and on the bottom wall forming the space 50, a pair of magnets made of magnetic rubber are installed over the entire length. 52 and a magnet 54 made of a pair of magnetic rubbers are fixedly installed.

As shown in FIG. 4, two rows of magnetic pole bands are formed on the surface of the magnet 52, with different poles adjacent to each other and extending in the direction perpendicular to the plane of the paper.

The same applies to the magnet 54.

Reference numeral 56 denotes a balance weight, and a magnet 58 made of a pair of magnetic rubbers and a magnet 60 made of a pair of magnetic rubbers are fixed to the lower surface of this weight.

On the surface of the magnet 58, as shown in FIG. 4, two rows of magnetic pole bands are formed, each extending in a direction perpendicular to the plane of the paper, with different poles adjacent to each other.

The same applies to the surface of the magnet 60.

The magnet 58 has a same polar face facing the magnet 52, and the magnet 60 has a same polar face facing the magnet 54.

The balance weight 56 floats above the bottom surface of the space 50 due to the repulsive magnetic force between the magnets 52 and 58 and the repulsive magnetic force between the magnets 54 and 60.

A plurality of guide rollers 62 for preventing lateral vibration are rotatably supported by the balance weight 56, and are in contact with one of a pair of vertical rail surfaces formed on the vertical rail 30.

One or more guide rollers (not shown) for preventing lateral vibration, which are rotatably supported by the balance weight 56, are in contact with the other of the pair of vertical rail surfaces.

One or more guide claws for preventing lateral vibration (not shown) rotatably supported by the balance weight 56 are in contact with the other of the pair of vertical rail surfaces.

64 is a vertical cursor, and a plurality of vertical rollers 66 rotatably supported on both sides of the vertical cursor are in contact with the horizontal rail surface of the vertical rail 30.

A plurality of horizontal guide rollers 68 are rotatably supported by the vertical cursor 64 and are in contact with one of a pair of vertical rail surfaces formed on the vertical rail 30. .

One or more horizontal guide rollers 70 rotatably supported by the vertical cursor 64 are in contact with the other vertical rail surface.

The vertical cursor 64 and the balance weight 56 are connected by a rope hung on rope pulleys (not shown) rotatably disposed at both ends of the vertical rail 30, so that they mutually move in opposite directions along the vertical rail 30. It is composed of

72 connects the vertical cursor 6 via a double hinge mechanism 74.
4, and straight rulers 76 and 78 are removably fixed to the ruler mounting plate of this head.

Next, the operation of this embodiment will be explained.

When the handle of the head 72 is grasped by hand and pressure is applied in any direction parallel to the surface of the drawing board 10, the horizontal cursor 16 moves along the horizontal rail 12, and the vertical cursor 64 moves along the vertical rail 3.
0, and these movements allow the head 72 to be moved to a desired position on the drawing board 10.

When the vertical cursor 64 moves along the vertical rail 30, the balance weight 56 moves the vertical cursor 64 along the vertical rail 30 while floating above the bottom surface of the space 50.
move in the opposite direction.

When the drawing board 10 is tilted from a horizontal state to an upright direction, for example, at an angle of 800 with respect to the floor surface, the weight insertion space 5 of the balance weight 56 is
The downward vertical load on the bottom surface of 0 is significantly reduced.

However, the opposing distances between the magnets 58 and 52 and between the magnets 60 and 54 do not widen significantly as the load is reduced, and the changes are slight.

This is because each magnetic pole surface of the magnets 58, 52, 60, and 54 is constituted by a plurality of rows of magnetic pole strips.

Therefore, as the inclination of the drawing board 10 changes, the balance weight 56
Since the rise and fall of the weight is small, there is no need to take up a large space in the weight insertion space 50.

Next, another embodiment will be described with reference to FIG.

Reference numeral 80 denotes a vertical cursor, and magnets 82, 84, 86° 88 each made of four magnetic rubbers are disposed on the upper and lower surfaces of the horizontal portions of the upright portions formed on both sides of the cursor.

The magnet rubbers of the magnets 82, 84, 86.degree. 88 are arranged in parallel so that different poles are adjacent to each other.

90°92, 94, 96 are magnets arranged on the vertical rail 98 to face the magnets 82, 84, 86°88, and each of these magnets consists of four magnet rubbers. The rubbers are arranged in parallel so that different polarities are adjacent to each other.

The magnets 82, 90.84, 92.86, 94.88, and 96 have like-pole surfaces facing each other, and the vertical cursor 80 floats relative to the vertical rail 98 due to the repulsive magnetic force acting between them.

100 is a guide roller for preventing lateral vibration.

Since the present invention is constructed as described above, the vertical width of the weight insertion space can be reduced, and the vertical rail can be made smaller and lighter.

[Brief explanation of drawings]

Figure 1 is an overall plan view, Figure 2 is a partial side sectional view, and Figure 3 is a partial side sectional view.
The figure is a partial side sectional view, FIG. 4 is a partial front sectional view, FIG. 5 is a sectional view showing another embodiment, and FIG. 6 is a gap between the magnets.
Repulsive force characteristic diagram, Figure 7 is a magnetic flux density distribution characteristic diagram for two magnets, Figure 8 is a magnetic flux density distribution characteristic diagram for four magnets, and Figure 9 is a magnetic flux density distribution diagram for six magnets. Characteristic diagram, 1st
Figure 0 is a magnetic flux density distribution characteristic diagram in the case of eight magnets. 2.4... Magnet, 6... Curve, 10... Drawing board, 1
2...Horizontal rail, 14...Magnetic rubber, 16
...Horizontal cursor, 18, 20...Colo, 22...
Vertical corner, 24...Horizontal rail surface, 26...Safety roller, 28...Horizontal rail surface, 30...Vertical rail, 32...Vertical bracket, 34...Axis, 36...
・Horizontal part, 38...Magnetic rubber 40...Fixed rail, 42...Magnetic rubber 44...Mounting member, 46...Magnetic rubber 50...Weight insertion space, 52.54...・Magnet, 56...Balance weight, 58.60...Magnet.

Claims (1)

[Claims] 1. A drawing board 10, a horizontal rail 12 disposed on the upper edge of the drawing board 10, a horizontal cursor 16 movably attached to the horizontal rail 12, and a vertical rail whose upper end is connected to the horizontal cursor 16. 30, a balance weight 56 movably disposed within a weight insertion space 50 formed over substantially the entire length of the vertical rail 30, and a balance weight 56 movably attached to the vertical rail 30.
In the rail-type flexible parallel ruler, which includes a vertical cursor 64 linked to move in opposite directions along the vertical rail 30 and a head 72 attached to the vertical cursor 64, the weight insertion space 50 on the bottom side of
A plurality of rows of magnetic pole strips having different poles adjacent to each other are arranged in parallel so that the direction of the rows is parallel to the longitudinal direction of the vertical rail 30, and on the balance weight 56 side,
A plurality of rows of magnetic pole strips are arranged so that the same poles as the magnetic pole strips face each other, and a repulsive magnetic force acting between the mutually opposing magnetic pole strips on the bottom side of the weight insertion space 50 and the balance weight 56 side causes the balance weight 56 to be , depending on its weight,
A balance weight guide device characterized by supporting a load in a direction substantially downward and perpendicular to the bottom of a weight insertion space 50.