JPH03162999A - Crosswise cursor movement load reduction mechanism in rail-type universal parallel rule and the like - Google Patents

Abstract

PURPOSE:To move a crosswise cursor along a crosswise rail by a small force by a method wherein the weight of a lengthwise rail is supported by a magnetic force on the side of the crosswise rail, whereby the weight of the upper part of the lengthwise rail is prevented from acting on a bearing support part of the crosswise cursor with the lengthwise rail as a large unbalanced load. CONSTITUTION:A load (a) on the side of the upper part of a lengthwise rail 16, caused by the weight thereof, acting in a direction vertical to the surface of a drawing board 2 is supported by a restitution magnetic force between magnetic pole surfaces 28a, 30a of magnetic bodies 28, 30. Therefore, a load on the side of the lengthwise rail 16, caused by the weight thereof, acting in a direction vertical to a drawing board 16, i.e., an arrow direction (a), is prevented from acting on a bearing support part of a shaft 18 of a crosswise cursor 10 as a large unbalanced load. Therefore, a large strain force never occurs between rollers 12, 12a and the journal thereof. In this manner, the crosswise cursor 10 can smoothly move along a crosswise rail 4 by a manual force for driving a head 22 rightward or leftward.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for reducing the movement load of a horizontal cursor in a rail type universal parallel ruler device or the like.

In the rail type universal parallel ruler device/rail type coordinate analyzer, the upper part of the vertical rail is rotatably supported on one side of the horizontal cursor in a plane perpendicular to the drawing surface. The lower part, or tail, of the vertical rail is movably placed on the drawing surface via the tail roller. Therefore, when cleaning the drawing surface, re-pasting the drawing, etc., the operator can lift the vertical rail from the drawing surface by rotating it around the axis of the horizontal cursor. The weight of the vertical rail is quite heavy. Half of the weight of the vertical rail is supported between the vertical rail tail roller and the drawing surface, and the other half of the weight is supported by the shaft support between the top of the vertical rail and the side of the horizontal cursor. When the large weight of the vertical rail is applied as an unbalanced load to the shaft support on the side of the horizontal cursor, since this shaft support is rotatable, the weight of the vertical rail acts on the horizontal cursor as a rotational moment. Conventionally, this rotational moment is supported by the rollers on the horizontal cursor side and the rail surface on the horizontal rail side, but this creates a twisting force between the rollers and the roller support shaft, which makes the movement of the horizontal cursor heavier. It has become.

As a means to remove the twisting force between the roller and the roller support shaft, first, a magnet is provided in place of the roller that receives the rotational moment of the horizontal cursor, and the magnet is provided on the rail surface side. If the rotational moment of the horizontal cursor is supported by the magnetic force between the two magnets, the problem of the twisting force generated on the roller support shaft can be solved since no rollers are used. However, if the roller is removed from the horizontal cursor, an error will occur in the movement accuracy of the horizontal cursor with respect to the horizontal rail. The horizontal cursor is required to have a horizontal vibration control roller that prevents movement in a direction parallel to the drawing surface and perpendicular to the longitudinal direction of the horizontal rail. The lateral vibration regulating rollers are in close contact with a lateral vibration regulating rail surface formed on the horizontal rail to prevent the horizontal cursor from lateral vibration relative to the horizontal rail.

When the horizontal cursor is displaced in a direction parallel to the figure mask and perpendicular to the longitudinal direction of the horizontal rail, this displacement is transmitted to the head via the vertical rail, and the head moves in the Y coordinate axis direction, that is, the longitudinal direction of the vertical rail. It is displaced in the direction along the direction. This causes an error in drawing accuracy or an error in coordinate reading accuracy, and significantly reduces the commercial value of the rail type universal parallel ruler device/coordinate analyzer. When a horizontal cursor is provided with a roller to prevent horizontal vibration, the rotational moment of the horizontal cursor creates a twisting force between the roller and its support shaft, making the movement of the horizontal cursor heavier. .

In other words, when the rotational moment of the horizontal cursor is supported by the magnetic force between the magnets, a gap is formed between the magnets, so
When the unbalanced load applied to the horizontal cursor changes due to external stress or the angle of inclination of the drawing board, the rotational moment of the horizontal cursor is thereby applied to the anti-lateral vibration rollers and the rail surface that receives them. One objective of the present invention is to reduce the moving load of the horizontal cursor, and the weight of the upper part of the vertical rail is placed on the horizontal rail side so that the weight of the vertical rail does not act as a large unbalanced load on the horizontal cursor. It is characterized in that it is supported by magnetic force interaction between the magnet provided on the vertical rail and the magnet provided on the upper side of the vertical rail, so that no large twisting force is generated on the roller on the horizontal cursor side.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, which is fixed to a tiltable table (not shown) at an arbitrary tilt angle. 4 is a horizontal rail fixed to the upper edge of the drawing board 2 by a vise-type fixture 6, and horizontal V-shaped rail grooves 8, 8a are formed along the longitudinal direction of the rail.
Known lateral vibration prevention rollers 12, 12a rotatably supported by the horizontal cursor 10 are rotatably fitted into the rail grooves 8, 8a. The horizontal cursor lO is parallel to the two surfaces of the drawing board by the horizontal vibration prevention rollers 12, 12a, and
Movement in a direction perpendicular to the longitudinal direction of the horizontal rail 4 is prevented. The horizontal cursor 10 is the roller 12, 12a.
It is configured to be able to move along the longitudinal direction of the horizontal rail 4 by rotational movement along the rail grooves 8, 8a.

4. In this embodiment, the rollers 12, 12a and the rail grooves 8, 8a also have the function of preventing the horizontal cursor 10 from moving in the direction perpendicular to the two planes of the drawing board, that is, in the vertical direction. . Note that the structure of the rail that receives the rollers 12, 12a is not particularly limited to the illustrated V groove. 16a is a bracket integrally fixed to the upper part of the vertical rail 16, and the bracket 16. The lower end of a is rotatably supported on a rising portion of one side of the horizontal cursor 10 about an axis l8 parallel to the longitudinal direction of the horizontal rail 4.

The vertical rail 16 is arranged around the drawing board 2 with the axis l8 as the center.
It is configured to be rotatable within a plane perpendicular to the plane.

A tail roller 17 is rotatably attached to the lower end or tail of the vertical rail 16, and the tail roller 17 is placed on the upper surface of the lower edge of the drawing board 2. A vertical cursor is movably attached to the vertical rail l6 via a roller, a head 22 is attached to the vertical cursor via a hinge member 20,
Straight rulers 24 and 26 are fixed to the ruler mounting plate of the head 22. In FIG. 2, 28 is a magnetic material, which is disposed on the upper surface of the horizontal rail 4 along its longitudinal direction. A magnetic body 30 is fixed to the bracket 16a, and its magnetic pole face 30a faces the magnetic pole face 28a of the magnetic body 28. The repulsive force acting between the magnetic pole faces 28a and 30a of the magnetic body 28, 30 urges the upper part of the vertical rail 16 in the direction b perpendicular upward to the two surfaces of the drawing board, and the upper part of the vertical rail 16 supports weight.

In the above configuration, the load a on the upper side of the vertical rail 16 in the direction perpendicular to the two planes of the drawing board due to its weight is supported by the repulsive magnetic force between the magnetic pole faces 28a and 30a of the magnetic bodies 28 and 30. Since the load in the direction perpendicular to the plane of the drawing board 16, that is, in the arrow direction a, due to the weight of the 16 vertical rails does not act as a large unbalanced load on the shaft 18 branch of the horizontal cursor 10, the rollers 12, 12a and their support shafts are No large straining force occurs between the two. Therefore, the horizontal cursor 10 smoothly moves along the horizontal rail 4 by manual force that drives the head 22 in the left-right direction in FIG.

7 Next, other embodiments will be described.

When the drawing board 2 is tilted, the falling force e due to the weight of the vertical rail 16 is equal to the falling load component in the direction a, parallel to the drawing board 2 surface, and with respect to the longitudinal direction of the horizontal rail 4. It is decomposed into a falling load component in the perpendicular direction, that is, the arrow direction C.

The horizontal cursor 10 supports the load in the above arrow direction C.
As shown in FIG. 2, a magnetic body 32 is fixed to the vertical portion of the bracket 16a to prevent an unbalanced load from being applied to the shaft 18 branch of the bracket 16a. The magnetic pole surface 32a of the magnetic body 32
The other magnetic pole face 28b of the magnetic body 28 and the same pole face face each other, and a repulsive magnetic force is generated between the two in the arrow direction d. When the inclination angle of the drawing board 2 is close to horizontal, among the falling load components on the upper part of the vertical rail 16, the load in the arrow direction a is large and the load in the arrow direction C is small.

Therefore, if the inclination angle of the drawing board 2 is not made large, the magnet 32 may not be provided. Also, as shown in Figure 2, approximately 4
When tilted at 5 degrees, magnets 30 and 32 are tilted 9 degrees to each other.
Although it is most desirable to provide the magnets with an angular difference of 0 degrees, either one of the magnets 30 and 328 may be provided. When drawing with the drawing board 2 standing perpendicular to the floor surface, the entire weight of the vertical rail 16 is applied in the arrow direction C, which is horizontal to the drawing board 2 surface. As shown in FIG. 4, this load in the arrow direction C is applied to the magnetic body 34 fixed in the longitudinal direction on the side of the horizontal rail 4 and the magnet 36 provided on the bracket 16a, that is, on the upper side of the vertical rail 16. If supported by repulsive force, the weight of the vertical rail 16 will not be applied as an unbalanced load to the shaft 18 branch of the horizontal cursor 10.

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

In FIG. 3, reference numeral 38 denotes a support member disposed parallel to 4 on the horizontal rail, and a magnetic body 40 is fixedly attached to this support member. 42 is a magnetic body fixed to the bracket 16a;
An attractive force is generated between the magnetic bodies 40 and 42. The upper part of the vertical rail l6 is biased in the arrow direction d by this magnetic attraction force, and the biased load due to the weight of the vertical rail l6 applied to the shaft 18 branch of the horizontal cursor 10 is reduced by this biasing force.

This embodiment is suitable when the drawing board 2 is used at a steep angle.

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

In FIG. 3, reference numeral 44 denotes a support body fixed in parallel to the horizontal rail, and a magnetic body 46 is fixedly attached to this support body. 48
is a magnetic body fixed to the bracket 16a, and a bow-sucking force is generated between the magnetic bodies 48 and 46. The vertical rail 16 is biased in the arrow direction b by this magnetic attraction force, and the biased load due to the weight of the vertical rail l6 applied to the shaft 18 branch of the horizontal cursor 10 is reduced by this biasing force. This embodiment is suitable when the drawing board 2 is used horizontally or at a small inclination angle.

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

In FIG. 3, reference numeral 50 denotes a support body fixed in parallel to the horizontal rail 4, and a magnetic body 52 is fixedly attached to this support body. 5
4 is a magnetic body fixed to the bracket 16a, and an attractive force is generated between the magnetic bodies 52 and 54. The vertical rail 16 is biased in the arrow direction f by this magnetic attraction force, and the biased load due to the weight of the vertical rail l6 applied to the shaft 18 branch of the horizontal cursor 10 is reduced by this biasing force. This embodiment is suitable when the drawing board 2 is used at an angle of approximately 45 degrees with respect to the floor surface.

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

Reference numeral 56 is a magnetic material, which is fixed to the horizontal rail 4 at a predetermined angle with respect to the plane of the drawing board. 58 is the bracket 16a
A repulsive magnetic force is generated between the magnetic bodies 56 and 58.

This repulsive magnetic force biases the vertical rail l6 in the arrow direction f, and this biasing force reduces the unbalanced load due to the weight of the vertical rail 16 applied to the shaft 18 branch of the horizontal cursor 1o.

This embodiment is suitable when the drawing board 2 is used at an angle of approximately 45 degrees with respect to the floor surface.

Next, a means for adjusting the strength of the magnetic force of the magnetic body will be explained.

In FIGS. 4 and 5, 34 is a magnetic body fixed to the horizontal rail 4, 60 is a shaft rotatably supported by the bracket 16a, and the magnetic body 36 and worm wheel 62 are fixed to this. There is. 64 is a worm, and 66 is a knob fixed to the worm shaft 68. In the above configuration, when the knob 66 is rotated, the worm wheel 62 is rotated, and the magnetic body 36 moves in a side force with respect to the magnetic body 34, and the strength of the magnetic force acting between the magnetic bodies 34 and 36 increases. Change. The amount of change in the strength of the magnetic force can be read on a scale (not shown).

Next, another embodiment will be described.

In FIG. 6, 70 is a magnetic body disposed on the horizontal rail;
72 is a magnetic material, 74 is a guide shaft, 76 is a bracket 16
This is a nut shaft rotatably supported by a, and a part of the screw of a shaft 80 connected to the magnetic body 72 is screwed into the threaded hole 78 of the nut shaft. A shaft 82 is rotatably supported by the bracket 16a, and a knob 84 is fixed to one end of the shaft, and a gear 86 is fixed to the other end. The gear 8
6 meshes with a gear 88 provided on the nut shaft 76.

In the above configuration, when the knob 84 is rotated, the nut member 76 is rotated, the shaft 80 is moved in the vertical direction in the figure, the magnetic body 72 is moved toward and away from the magnetic body 70, and the magnetic body 72 is moved toward and away from the magnetic body 70.
．． The strength of the magnetic force that acts over a period of 70 minutes changes.

Next, another embodiment will be described.

In FIG. 7, 90 is a magnetic material, 92 is an electromagnet,
The magnetic force of the electromagnet 92 can be appropriately adjusted by adjusting the volume. In addition, a potentiometer of the tilting device shown in the drawing plate 2 is provided, and the electromagnet 92 is controlled by the resistance value change of this potentiometer, and the strength of the magnetic force of the electromagnet 92 is automatically changed in proportion to the inclination angle of the drawing board 2. It may be configured as follows.

By providing the above adjustment means, even if the load due to the weight of the vertical rail applied to the magnetic body on the horizontal rail side changes due to a change in the inclination angle of the drawing board, the magnetic force can be set to the optimal state in response to this change. be able to.

As described above, the present invention supports the weight of the vertical rail on the horizontal rail side using magnetic force, so that the weight of the upper part of the vertical rail does not act as a large unbalanced load on the axial support of the horizontal cursor with the vertical rail. , the horizontal cursor can be moved along the horizontal rail with a light force, and the magnetic force can be adjusted, so even if the inclination angle of the drawing board is changed, the load on the vertical rail against the horizontal rail can be controlled by the magnetic force. This has the effect of completely canceling out the above unbalanced load.

[Brief explanation of the drawing]

Figure 1 shows a preferred embodiment of the present invention; Figure 1 is a plan view;
2 is a side view, FIG. 3 is a side view, FIG. 4 is a side view, FIG. 5 is a sectional view, FIG. 6 is a sectional view, and FIG. 7 is a sectional view. 2... Drawing board, 4... Horizontal rail, 8, 8a... Rail groove, 10... Horizontal cursor, 12, 12a... Lateral vibration prevention roller, 16... Vertical rail, 16a. ...Bracket, 18...Shaft, 22...Head, 24.26.
...straightedge, 28...magnetic material, 30...magnetic material.

Claims (1)

[Claims] 1. A horizontal rail fixed to the drawing board, a horizontal cursor movably attached to the horizontal rail via a lateral shake prevention roller, and an upper part rotatably connected to one side of the horizontal cursor. In a device comprising a vertical rail, a vertical cursor movably attached to the vertical rail, and a head connected to the vertical cursor, a magnetic material is disposed on the horizontal rail side over substantially the entire length in the longitudinal direction, A magnetic body opposite to the magnetic body is disposed on the upper side of the vertical rail, and the weight of the upper side of the vertical rail is supported by magnetic force interaction between the two magnetic bodies, and the strength of the magnetic force of the magnetic body is A mechanism for reducing the movement load of a horizontal cursor in a rail-type flexible parallel ruler device, etc., characterized by having a means for adjusting the width.