JPH0362557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parallel ruler device, and a balance mechanism that offsets the moving force of the horizontal ruler in the direction of gravity by the weight of a balance weight, and a balance mechanism that offsets the moving force of the horizontal ruler in the direction of gravity by the weight of a balance weight, and a parallel ruler device that moves at least one of the horizontal ruler and the balance weight from their supporting surfaces. The feature is that the horizontal ruler can be moved smoothly with a light force by combining it with a magnetic levitation mechanism. Another feature of the present invention is that lateral vibration of the balance weight moving along the balance weight running path is prevented by lateral vibration prevention rollers.

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a drawing board, which is fixed to the drawing board support frame of the drafting table so that it can be set at a desired inclination angle between a horizontal state and a substantially vertical standing state. 4 and 6 are drawing board 2
A weight insertion space 8 and a groove are formed in the vertical rails 4 and 6 over the entire length in the longitudinal direction. In the groove on the top side of the vertical rail, a magnet 10 consisting of four magnetic rubbers is installed along the entire length of the rail.
are arranged in parallel so that different poles are adjacent to each other,
Four magnetic pole tracks of SNSN are formed on the upper surface of each of the vertical rails 4 and 6 by the magnetic rubber. In the groove on the bottom side of the vertical rail, there are magnets 12 and 1 each made of two magnetic rubbers.
4 are fitted with each other so that different poles are adjacent to each other, and a pair of two NS magnetic pole tracks are formed at a predetermined interval on the bottom surface of the weight insertion space 8 by the magnetic rubber. . Reference numeral 16 denotes a magnet consisting of four magnetic rubbers that are fitted and fixed in parallel in a groove formed on the lower surface of the upper horizontal part of the vertical cursor 18 so that different polarities are adjacent to each other.
The same polarity faces the magnet 10, and the vertical cursor 18 floats relative to the vertical rail 4 due to the repulsive magnetic force acting between the magnets 16 and 10. The magnets 16, 10, 12, 14 are attached to band-shaped iron pieces 20, 2 placed on the bottom of the groove in which they fit.
It is adsorbed to 2, 24, and 26. Reference numeral 28 denotes two guide rollers for preventing lateral vibration that are rotatably supported on the lower horizontal portion of the vertical cursor 18, and the surfaces of these guide rollers are similar to the pair of vertical rail surfaces formed on the bottom wall of the vertical rail 4. It is in rotatable contact with one of the rail surfaces. One guide roller (not shown) for preventing lateral vibration, which is rotatably supported by the lower horizontal portion of the vertical cursor 18, is rotatably abutted on the other of the vertical rail surfaces. One end of each wire rope 30, 32 is connected to the front and rear of the upper horizontal portion of the vertical cursor 18, and the wire ropes 30, 32 are connected to rope pulleys 34, 36 rotatably disposed on both sides of the vertical rail 4. It's being passed around. 38 is a balance weight disposed within the weight insertion space 8, and the other ends of the wire ropes 30, 32 are connected to the front and rear ends of this balance weight. Reference numerals 40 and 42 designate magnets consisting of a pair of magnetic rubbers fixed to both sides of the lower surface of the balance weight 38, respectively.The magnet 40 has the same polarity facing the magnet 12, and the magnet 42 has the same polarity facing the magnet 12. The homopolar plane faces 14. Due to the repulsive magnetic force acting between the magnets 40 and 12 and between 42 and 14, the balance weight 38 floats a predetermined distance from the bottom surface of the weight insertion space 8. Reference numeral 44 designates a pair of guide rollers for preventing lateral vibration that are rotatably supported on the lower surface of the balance weight 38, and these surfaces are formed along the entire length of the bottom wall of the vertical rail 4 in its longitudinal direction. A balance weight 38 is rotatably abutted on one of the pair of vertical rail surfaces, and a balance weight 38 is rotatably positioned on the lower surface of the balance weight 38 on the other surface of the vertical rail surface. The surface of a guide roller (not shown) that is pivotally supported is in contact with the surface of the guide roller (not shown). 4
6 is a ruler mounting plate formed integrally with the vertical cursor 18, and between this and a ruler mounting plate 48 formed integrally with the vertical cursor 50 movably arranged along the vertical rail 6. A horizontal ruler 52 is removably hung on the frame. As shown in FIG. 3, mounting screws 54 are fixedly installed near both ends of the horizontal ruler 52, washers 56 are fitted onto the mounting screws 54, and moldings 58 are screwed together. 60 is the mounting screw 5
This is a cap screw screwed onto the upper end of 4 to prevent the molding from coming off. Both ends of the horizontal ruler 52 are attached to the mounting plate 46,
48, and attach the mounting screw 54 to the mounting plate 46,
48 into the vertically elongated holes 62, 64, and then rotate the molding 58 in the tightening direction to tighten the horizontal ruler 52.
Both ends of the ruler are fixed to ruler mounting plates 46 and 48. The lower surface of the horizontal ruler 52 is set in a slightly elevated state with respect to the two surfaces of the drawing board. A balance weight (not shown) is also arranged on the vertical rail 6, and the configuration of the balance weight, vertical rail 6, and vertical cursor 50 is exactly the same as that of the balance weight 38, vertical rail 4, and vertical cursor 18. .

The total weight of the horizontal ruler 52 and the vertical cursors 18, 50, and the balance weight 38 on the vertical rails 4, 6 side
The total weight of is set to be the same.

Next, the operation of this embodiment will be explained.

Normally, this type of parallel ruler device is used with the drawing board 2 standing vertically. When the drawing board 2 is raised up, the horizontal ruler 52 tries to fall along the drawing board 2 surface, but this falling force is due to the falling force of the two balance weights 38 (one not shown). Even if the horizontal ruler 52 is canceled out and the hand is released, if force is applied to the horizontal ruler 52 or the vertical cursors 18, 50 in the vertical direction in FIG. 1, the vertical cursors 18, 50 will
While floating due to magnetic repulsion, the vertical rail 4,
The two balance weights 38 are guided by the vertical rail surfaces of the vertical cursors 1 and 6, and move vertically in conjunction with the vertical cursors 18 and 50.
It moves in a floating state while being guided by the vertical rail surfaces of the vertical rails 4 and 6 in a direction opposite to that of the vertical rails 8 and 50. As described above, since the vertical cursors 18, 50 and the balance weight 38 are suspended by magnetic force relative to the travel path, the horizontal ruler 52 can be moved smoothly with extremely light manual operation force. Incidentally, the magnetic levitation force is not particularly limited to one using magnetic repulsion force, but a configuration using magnetic attraction force is also possible.

Next, another embodiment will be described with reference to FIGS. 4 and 5.

66 is a horizontal ruler suspended between a pair of vertical cursors, and a guide rail 68 extends over the entire length of the ruler.
is permanently installed. Magnetic rubbers 70 and 72 are fitted and fixed in grooves opening on the upper surface of the guide rail 68 over the entire length of the guide rail 68. 74 is a horizontal cursor, and magnetic rubbers 76 and 78 are fitted and fixed in the grooves opening on the lower surface of the horizontal cursor, and the magnetic rubbers 76 and 70 and 78 and 72 have the same polar surfaces facing each other. Due to the repulsive force acting between the magnetic rubbers 76 and 70 and 78 and 72, the bottom surface of the horizontal cursor 74 floats a predetermined distance above the top surface of the guide rail 68.
80 and 82 are concave curved rail surfaces formed over the entire length of the guide rail 68, and two convex curved rollers 84 rotatably supported by the horizontal cursor 74 are in contact with the rail surface 80, and the rail A convex curved roller (not shown) rotatably supported by the horizontal cursor 74 is in contact with the surface 82 . A threaded rod 86 is fitted into a vertical hole 88 transparently provided in the horizontal cursor 74, to which a brake lever 92 is fixed, and the threaded rod 86 is screwed into a screw hole in a brake piece 90. One of the brake pieces 90 has a horizontal cursor 74
The other end is slidably in contact with the lower end of the guide rail 68, and the other end is in slidable contact with the projecting piece of the guide rail 68. The brake piece 90 is urged downward by the elasticity of the coil spring. 94 is a handle fixed to the horizontal cursor 74, and 96 is a ruler mounting portion formed on the horizontal cursor 74, to which a vertical ruler 98 is removably fixed by known means. In the above configuration, when the handle 94 is grasped by hand and pressure is applied in the longitudinal direction of the horizontal ruler 66, the horizontal cursor 74 moves along the rail surfaces 80, 82, and the movement of the horizontal cursor 74 moves the vertical ruler 66. 98 moves along the horizontal ruler 66 while maintaining a state perpendicular to it. When the brake lever 92 is swung and the threaded rod 86 is further screwed into the screw hole of the brake piece 90, the upper surface of the brake piece 90 and the lower surface of the horizontal cursor 74 clamp the projecting piece of the guide rail 68, and the horizontal cursor 74 It is fixed to the guide rail 68.

Next, another embodiment will be described with reference to FIG.
100 is a drawing board, 102 is a magnet arranged on both sides of the drawing board 100, 104, 106, 108, 11
0, 112, 114 are rope pulleys, 116 is the rope pulley 104, 106, 108, 110
It is a wire rope that is stretched in a horizontal figure 8 shape with an appropriate tension between the wire ropes 11 and 11.
Both ends of a horizontal ruler 118 are connected to 6. A wire rope 120 is connected between the rope pulleys 112 and 114.
is stretched around the wire rope 120 with an appropriate tension, and a horizontal ruler 118 and a balance weight 122 are connected to the wire rope 120. balance weight 1
The weight of 22 is set to be the same as the weight of horizontal ruler 118. The magnets 102, 10 of the horizontal ruler 118
Magnets 124, 124 are fixedly installed on the surface facing 2, and the same polar surfaces of the magnets 124 and 102 face each other,
The horizontal ruler 118 is slightly elevated relative to the drawing board 100 due to the repulsive magnetic force.

In the above configuration, when the horizontal ruler 118 is manually moved in the vertical direction along the drawing board 100, the wire rope 1 moves in conjunction with the horizontal ruler 118.
16 and 120 also move guided by pulleys, and the horizontal ruler 118 is always held horizontally by the movement of the wire rope 116.

Next, another embodiment will be described with reference to FIG.
130 is the upper horizontal part 132a of the vertical cursor 132
It is a vertically oriented Ceratei roller, that is, a friction force reducing member, which is rotatably supported by a plurality of shafts 134 approximately in the center of the
The surface of the safety roller 130 faces a rail surface 136a formed on the upper surface of the vertical rail 136 with a slight gap, and the gap is set shorter than the opposing gap between the magnets 138 and 140 and 142 and 144. There is. The Seratei roller 130 is the vertical rail 1
It may be provided on the 36 side. Reference numeral 146 denotes a vertical safety roller (frictional force reducing member) that is rotatably supported by a plurality of shafts 150 below the balance weight 148, and the surface of the safety roller 146 is formed on the bottom surface of the weight insertion space 152. Rail surface 1
The magnets 52a face each other with a slight gap between them, and the gap is set shorter than the gap between the opposing magnets 154 and 156 and between the opposing magnets 158 and 160.

In the above configuration, when an external stress is applied to the horizontal ruler or the vertical cursor 132 in a direction downward and perpendicular to the drawing surface, and the vertical cursor 132 is displaced in the above direction, the surface of the safety roller 130 changes to the rail surface 132.
a, and magnets 138 and 140 and 142 and 1
44 and prevent large frictional force from being generated on the vertical cursor 132. In addition, the magnet 13
8, 140, 142, 144 can be prevented from being damaged or rubbed. Furthermore, even if the balance weight 148 descends toward the bottom of the space 152 against the repulsive magnetic force while traveling within the weight insertion space 152, the safety roller 146 moves toward the rail surface 152.
2a, the magnetic surfaces of the magnets 154, 158 do not come into contact with the magnetic surfaces of the magnets 156, 160 facing them.

Next, another embodiment will be described with reference to FIG.
Reference numeral 162 designates a plurality of vertical guide rollers rotatably supported approximately at the center of the upper horizontal portion of the vertical cursor 164. are facing each other. A plurality of vertical guide rollers 168 are rotatably supported under the balance weight 170, and the surfaces of the guide rollers are in contact with a rail surface formed on the bottom surface of the weight insertion space 172. There is. Reference numerals 174, 176, 178, and 180 are magnets that apply a repulsive magnetic force in a direction that causes the vertical cursor 164 to levitate from the vertical rail 166, and the repulsive magnetic force of the magnets causes the surface of the guide roller 162 to move against the rail surface facing it. is lightly touching. 18
0, 182, 184, and 186 are magnets that apply a repulsive magnetic force in a direction in which the balance weight 170 floats from the bottom surface of the weight insertion space 172;
Due to the repulsive magnetic force of the magnet, the guide roller 168
The surface of the rail is in light contact with the opposing rail surface.

Incidentally, a safety roller or a guide roller can be attached to the horizontal cursor 74 shown in FIGS. 4 and 5 in the same manner as described above.

Further, in FIG. 8, the guide rollers 162 may be provided on the vertical rail 166 side, and the guide rollers 162 may be brought into contact with the lower surface of the vertical cursor 164.
A guide roller 168 is provided on the vertical rail 166 side, and the balance weight 17 is
It may be configured to receive the bottom surface of 0.

Since the present invention is configured as described above, there is an advantage that the ruler can be moved lightly and smoothly. Further, due to the action of the lateral vibration prevention rollers, the opposing positions of the magnets on the side of the balance weight running path and the magnets on the side of the balance weight do not shift in the direction perpendicular to the running direction of the balance weight. Therefore, the balance weight maintains full levitation relative to its travel path.

If there is no side shake prevention roller and the balance weight shifts in a direction perpendicular to its travel path, the opposing area between the magnet on the balance weight travel path and the magnet on the balance weight side will decrease, and the levitation force between the magnets will decrease. As the weight decreases, the balance weight falls due to its own weight or running inertia, and the magnet on the balance weight side collides with the magnet on the side of the balance weight traveling path, causing the magnet to be damaged or worn out. The present invention has the effect of solving this problem.

[Brief explanation of drawings]

The figures show preferred embodiments of the present invention; FIG. 1 is an overall plan view, FIG. 2 is a cross-sectional view of essential parts, FIG. 3 is a cross-sectional view of the horizontal ruler attachment mechanism, and FIG. 4 is another embodiment. FIG. 5 is a partially sectional side view of the same part, FIG. 6 is an explanatory plan view showing another embodiment, FIG. 7 is a sectional view of essential parts showing another embodiment, and FIG. The figure is a sectional view of main parts showing another embodiment. 2... Drawing board, 4, 6... Vertical rail, 8... Weight insertion part, 10... Magnet, 12, 14... Magnet, 16... Magnet, 18... Vertical cursor, 20,
22, 24, 26... Iron piece, 28... Guide roller, 30, 32... Wire rope, 34, 36...
...Rope pulley, 38...Balance weight, 4
0,42...Magnet, 44...Guide roller, 46,
48...Ruler mounting plate, 50...Vertical cursor, 52
... Horizontal ruler, 66 ... Horizontal ruler, 68 ... Guide rail, 70, 72 ... Magnetic rubber, 74 ...
...Horizontal cursor, 76, 78...Magnetic rubber.

Claims (1)

[Claims] 1. A drawing board, a horizontal ruler arranged so as to be able to freely move in parallel on the drawing board surface, and a weight insertion space that is connected to the horizontal ruler by a rope or the like so as to move in opposite directions to the horizontal ruler, and is surrounded by a sealed weight insertion space. A device comprising a balance weight disposed within a section, a magnet is disposed over substantially the entire length of the travel path of the balance weight, a magnet opposing the magnet is attached to the balance weight, and the magnetic force of both magnets is The balance weight is made to float completely on the running path, and furthermore, a plurality of guide rollers for preventing lateral vibration are rotatably supported on the balance weight, and a plurality of guide rollers are rotatably supported on the balance weight in the longitudinal direction of the running path of the balance weight. A pair of rail surfaces are provided along the rail surface, one or more surfaces of the plurality of lateral vibration prevention guide rollers are brought into contact with one surface of the pair of rail surfaces, and the other of the rail surfaces is A parallel ruler device characterized in that the surface of the remaining guide roller for preventing lateral vibration among the plurality of guide rollers for preventing lateral vibration is brought into contact with the surface of .