JPH0459160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a guide device for controlling lateral vibration of a cursor in a rail type universal parallel ruler/coordinate analyzer.

In a conventional guide device for controlling lateral vibration of a cursor, when the cursor is tilted with respect to a plane horizontal to the drawing board due to an unbalanced load applied to the cursor, the vertical rail surface 2 on the rail side, as shown in FIG. 4, the surfaces of the rollers 6 and 8 tend to be inclined, and the rollers 6 and 8 are inclined according to the amount that the rollers 6 and 8 are inclined.
A part of the surface of 8 tries to move in the direction of biting into the vertical rail surfaces 2 and 4. This roller 6,
Of course, the movement of rollers 6, 8 in the direction of biting into the vertical rail surfaces 2, 4 is blocked by the vertical rail surfaces 2, 4, but the twisting force corresponding to the amount of movement a in the direction of biting is This caused the drawback that the rollers 6 and 8 did not rotate smoothly and the movement of the cursor became slow.

It is an object of the present invention to eliminate the above-mentioned defects by preventing twisting forces from occurring on the rollers as the cursor tilts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained in detail below based on embodiments shown in the accompanying drawings.

Figure 1 shows a rail-type flexible parallel ruler, in which 10 is a drawing board, 12 is an aluminum horizontal rail fixed to the drawing board 10, and a horizontal cursor 14 is movable via rollers on this rail. installed. 16 is a vertical rail made of aluminum, one end of which is connected to the horizontal cursor 1 through a bracket.
4, the guide rail 1 is rotatably attached to the drawing board 10 in a plane perpendicular to the drawing board 10, and the tail end side of the vertical rail 16 is fixed to the drawing board 10 via a tail roller.
It is placed on eight sides so that it can run freely. A vertical cursor 20 is movably attached to the vertical rail 16 via rollers, and a ruler operation head 22 is attached to this via a hinge connection member.
Straight rulers 24 and 26 are attached to the ruler attachment plate 2. In the case of a rail type coordinate analyzer, an encoder is attached to each end of the horizontal rail 12 and the vertical rail 16 to convert the movement of the horizontal cursor 14 and the vertical cursor 20 into digital signals.
In addition, instead of the head 22, a reading head with a crosshair indicator drawn on a transparent plate is used as the vertical cursor 20.
It can be installed on.

In FIG. 3, 12 is a horizontal rail, and a pair of holding parts 28 and 30 protrude from the lower surface of the horizontal rail 12 in a direction substantially perpendicular to the surface of the drawing board 10 over the entire longitudinal length of the horizontal rail 12. It is set up. Holding part 2
A groove is formed in a straight line along the entire length of the grooves in the opposing side surfaces of the grooves 8 and 30, and iron plate-like members 32 and 34 are disposed in the groove along the entire length thereof.

36 is a steel roller (the other roller is not shown) consisting of a pair of ball bearings rotatably supported around a pair of support shafts provided perpendicularly to the horizontal cursor 14; The intermediate portion of the surface is in contact with the vertical guide surface of the plate member 32. Reference numeral 38 denotes a steel roller made of a ball bearing rotatably supported around a support shaft provided perpendicularly to the horizontal cursor 14, and the intermediate portion of the surface of this roller is a vertical guide surface of the plate member 34. is in contact with. The roller 38 faces approximately the middle of the pair of rollers 36, and the vertical cross-sectional shape of the surfaces of the rollers 36, 38 is set to a convex surface shape curved in the direction of the plate-shaped members 32, 34. 40,42
is a cursor load roller rotatably supported vertically on the horizontal cursor 14, and the rollers 40, 4
2 is rotatably mounted on a horizontal rail surface formed parallel to the plane of the drawing board 10 over the entire length of the horizontal rail 12 in the longitudinal direction. In addition, horizontal cursor 1
The guide means for supporting the load applied to the horizontal cursor 14 and guiding the horizontal cursor 14 in its moving direction is not particularly limited to the structure of the horizontal rail surface and the rollers 40, 42, but may be a structure using magnetic force or other means. can be adopted.

The tapered convex curved surface shape of the surface members of the rollers 36, 38 may be formed into a gentle shape as shown in FIG. However, the tapered convex curved surface shape of the surface members of the rollers 36, 38 must meet the following requirements. That is, a projected view of the contact surfaces of the rollers 36 and 38 with the plate-like members 32 and 34 on an imaginary plane perpendicular to the drawing board 10 and the horizontal rail 12 is the roller contact portion of the plate-like members 32 and 34. It is located within a region of a circle 44 whose diameter is the distance between the projection planes of A and B on the imaginary plane, and whose center is the midpoint of a straight line connecting the projections of the roller contact parts A and B. Examples satisfying this condition are shown in FIGS. 3 to 6. In FIG. 5, a ring-shaped iron surface member 46 is fitted onto the outer ring of the ball bearing by shrink fitting. In FIG. 6, a V-groove is formed in the outer ring of the ball bearing, and a ring-shaped iron surface member 48 with a circular cross section is fitted and fixed in the V-groove by shrink fitting.

Next, the operation of this embodiment will be explained.

When you hold the handle of the head 22 in your hand and press the handle in any direction horizontal to the surface of the drawing board 10, the horizontal cursor 14 moves along the horizontal rail 12, and the vertical cursor 20 moves along the vertical rail 16. This allows the head 22 to be moved to any location on the drawing board 10.

In FIG. 3, when a large downward load is applied to the raised portion 14' of the horizontal cursor 14, the horizontal cursor 14 rotates clockwise in the figure with the rollers 42 as the fulcrum, and the rollers 40 move against the horizontal regulating surface 6. Tilt until it touches the. At this time, as the horizontal cursor 14 tilts, the rollers 36 and 38 move toward the plate members 32 and 3.
Tilting without increasing pressure from 4. A large load is applied upward to the rising portion 14' of the horizontal cursor 14, and the horizontal cursor 14 moves as shown in FIG.
The same applies when tilting counterclockwise. The above theory of operation applies to the embodiments shown in FIGS. 4-6.

In this embodiment, a case has been described in which the guide device of the present invention is provided for each of the horizontal cursor 14 and the vertical cursor 20, but it is of course possible to provide the present device only for either one.

Since the present invention is configured as described above, there is an advantage that the cursor can be easily moved in a straight line along the rail without increasing the pressing force between the rollers and the vertical surface on the rail side due to the inclination of the cursor.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of a rail type universal parallel ruler, Fig. 2 is an explanatory diagram of the prior art, Fig. 3 is a sectional view showing an embodiment of the present invention, and Fig. 4 is another embodiment of the present invention. FIG. 5 is a cross-sectional view showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view showing another embodiment of the present invention. 2, 4... Vertical rail surface, 6, 8... Roller, 1
0...Drawing board, 12...Horizontal rail, 14...Horizontal cursor, 16...Vertical rail, 18...Guide rail, 20...Vertical cursor, 22...Head, 2
4, 26... Straight ruler, 28, 30... Holding part, 3
2, 34... plate member, 36, 38... roller, 4
0,42...Koro, 44...Yen, 46,48...
Surface member.

Claims (1)

[Claims] 1. A drawing board, a horizontal rail provided on the upper edge of the drawing board, a horizontal cursor movably attached to the horizontal rail, and one end of the horizontal cursor located within a plane perpendicular to the drawing surface. a vertical rail that is rotatably supported on the drawing surface and whose other end is movably placed on the drawing surface or a rail surface parallel thereto; a vertical cursor that is movably attached to the vertical rail; In a rail-type flexible parallel ruler or the like having a head connected to the vertical cursor, the rail is provided with a pair of holding parts that protrude substantially perpendicularly to the drawing surface over the entire longitudinal length of the rail, Along the entire length of the side surface of the holding part, plate-like members made of a material different from the holding part and having a higher hardness than the holding part are arranged parallel to each other with an appropriate interval, and the plate-like members are A flat roller guide surface is installed so as to be approximately perpendicular to the drawing surface, and a plurality of rollers having a surface of the same degree of hardness as the plate member are mounted on the cursor approximately perpendicular to the drawing surface. The rollers are rotatably supported around a supporting shaft, the surfaces of at least two of the plurality of rollers are in contact with the guide surface of one of the plate-shaped members, and the rollers of the plurality of rollers are rotatably supported. The surface of at least one roller is brought into contact with the other guide surface of the plate member, and the projection of the contact surface of the roller with the plate member on an imaginary plane perpendicular to the drawing plane and the rail. The figure is located within a region of a circle whose diameter is the distance between projected views on the imaginary plane of the roller abutting portion of the plate-like member, and whose center is the midpoint of a straight line connecting the projected views of the roller abutting portion. A guide device for controlling lateral vibration of a cursor, characterized in that the vertical cross-sectional shape of the surface of the roller is a tapered convex curved shape.