JPS5855297A - Rule guide apparatus for parallel rule - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ruler guide device for a parallel ruler, and in particular,
The feature is that the frictional force of the ruler guide part is reduced by using the attractive force of the magnet.

Devices that use the repulsive force of magnets to bias the vertical cursor supporting both ends of the ruler in the floating direction relative to the vertical rail, thereby reducing the running friction of the vertical cursor along the vertical rail, are generally known. Developed by the applicant. When the repulsive force of a magnet is used to reduce the running friction force of a vertical cursor, the following defects exist. In other words, the drawing board to which this type of rail type is attached generally can be set at any inclination angle within the range of approximately horizontal to the floor and approximately 80 degrees in the direction of standing. is supported on a drafting table. Therefore, when the drawing board is horizontal to the floor, the load applied to the vertical rail in the direction perpendicular to the drawing surface of the vertical cursor is the largest, and the drawing board is at an angle of approximately 80° to the floor. When the rail is tilted to , the load applied to the vertical rail 20 side in the direction perpendicular to the drawing surface of the vertical rail is the smallest. This means that when the load on the vertical cursor side due to the weight of the ruler and vertical cursor is supported by the repulsive force between the magnet placed on the vertical rail side and the opposing magnet placed on the vertical cursor side, As the inclination angle of the drawing board changes, the opposing gap between the magnets changes significantly. This results in a large change in the distance between the lower surface of the straightedge installed between the vertical cursors and the drawing surface, which is unfavorable for precise line drawing work.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned defects by reducing vertical movement changes of the vertical cursor in a direction perpendicular to the drawing surface due to changes in the load of the vertical cursor. The structure of the present invention will be explained in detail below based on the embodiment shown in the attached drawings. 02 is a drawing board, which can be set to a desired inclination angle between a horizontal state and a substantially upright state. Reference numeral 6 denotes a vertical rail fixed to both sides of the drawing board 2 by a vise-type fixture, and 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. . Four magnetic pole tracks are formed in the order of N5NS from the top in the drawing on the outer surface of the vertical rail 4.6 perpendicular to the outer drawing surface.

There are 2 grooves in the grooves on both sides of each inner wall surface of the vertical rails 4 and 6.
Magnets 14 and 16 made of book magnetic rubber are fitted and fixed so that different polarities are adjacent to each other, and the magnets 14 and 16 are attached to both sides of the weight insertion space 8 perpendicular to the drawing surface by the magnetic rubber.
A pair of two S magnetic pole tracks are formed at a predetermined interval. Magnets 18 are made of four magnetic rubbers that are fitted and fixed in parallel through a steel plate 22 so that different poles are adjacent to each other in a groove formed on the inner surface of the vertical part perpendicular to the drawing surface of the vertical cursor 20. , and the magnet 18 is the magnet 1
A different polarity surface faces 0, and a downward load in a direction perpendicular to the two surfaces of the vertical cursor 200 drawing board is supported by the attraction magnet acting between the magnets 18 and 10.

Reference numeral 24 denotes two guide rollers for preventing lateral vibration that are rotatably supported on the lower horizontal portion of the vertical cursor 20, and the surfaces of these guide rollers correspond to a 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 20, is rotatably abutted on the other vertical rail surface 28 of the vertical rail surfaces. .

One end of each wire rope 50, 52 is connected to the front and back of the upper horizontal portion of the - cursor 20, and the wire rope 30.
52 is hooked up to rope pulleys 54 and 56 rotatably disposed at both ends of the vertical rail 40. 38 is a magnet consisting of a pair of magnetic rubbers which are abraded by a balance weight disposed within the weight insertion intermediate portion 8;
The magnet 40 has a different polarity surface facing the magnet 14, and the magnet 42 has a different polarity surface facing the magnet 16. The balance weight 38 floats a predetermined distance from the bottom surface of the weight insertion space 8 due to the attractive magnetic force acting between the magnets 40 and 14 and between 42 and 16. Reference numeral 44 designates a pair of guide and idle rollers for preventing lateral vibration that are rotatably supported on the lower surface of the balance weight 38, and these surfaces are
It rotatably abuts one of a pair of vertical rail surfaces formed along the entire length of the bottom wall of the vertical rail 4 along its longitudinal direction, and the other of the vertical rail surfaces has a balance plate. The lower surface of the weight 68 is in contact with the surface of a guide roller (not shown) located between the pair of guide rollers and rotatably supported. 46 is a ruler mounting plate formed integrally with the vertical cursor 20, 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. Said horizontal ruler 5
As shown in FIG. 3, mounting screws 54 are fixedly installed near both ends of the mounting screw 54, and washers 56 are fitted onto the mounting screws 54, and the molding 5B is screwed into the mounting screws 54. 60 is a cap screw screwed onto the upper end of the mounting screw 54 to prevent molding.

Bring both ends of the horizontal ruler 520 to the mounting plate 46.48, fully insert the mounting screw 54 into the vertical hole 62.64 of the mounting plate 46.48, and then rotate the molding 58 in the tightening direction to remove 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 to be slightly elevated with respect to the two surfaces of the drawing board. A balance weight is also arranged on the vertical rail 6, and the structure of the vertical cursor 50 and the vertical rail 6 is the same as that shown in FIG. In this embodiment, the strength of the attractive force between the magnets 10 and 18 on the vertical rail 4 and the vertical cursor 20 side is
The strength of the attractive force between ′ and ′ is approximately the same. Also, the horizontal ruler 5 above
2 and vertical cursor 20.500 total weight and vertical rail 4,6
The total weight of the side balance weights 58 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 hole and the rule 52 try to fall along the drawing board 2 surface, but this falling blade is two balance ways) 5a 1llAi1
．． l! Offset by the falling blade of $ Pokuhani, horizontal ruler 52
Even if you release your hand, the horizontal ruler 52 remains at the desired position. When a force is applied to the horizontal ruler 52 or the vertical cursor 20.50 in the vertical direction in FIG. The two balance weights 58 move while being guided by the rail 26°28 surface, and in conjunction with this vertical cursor 20.50, the two balance weights 58 move toward the vertical rail surface of the vertical rail 4.6 in the opposite direction to the vertical cursor 20.50. As described above, the vertical cursors 20 and 50 and the balance weight 68 are suspended by magnetic force with respect to the travel path, so the horizontal ruler 52 can be moved smoothly with extremely light manual operation force. It is carried out in In addition, when the inclination angle of the drawing board 2 is changed from, for example, horizontal to the floor surface to an inclination angle of approximately 80°, the total weight of the horizontal ruler 52 with respect to the vertical rail 4 and the drawing board 2 surface The load in the vertical direction changes in the direction of relief. However, although the magnet 18 slightly changes upward relative to the magnet 10 due to this load change, the upper end U of the magnet 18 does not move above the upper end V of the magnet 10. The magnet 18 prevents the ruler 52 from floating too high relative to the two surfaces of the drawing board even if the load changes as described above. That is, as long as the magnet has a magnetic force equal to or greater than a predetermined value, a considerable range of magnet selection is allowed.

As described above, in the present invention, both ends of the horizontal ruler are biased in the direction of floating relative to the vertical rail by the attractive force of the magnet.
Even if the load on the vertical rail on the horizontal ruler side changes, the change in the height level of the horizontal ruler relative to the drawing surface can be minimized, and accuracy is not required for the magnitude of the magnetic force of the magnet, so the parallel ruler In particular, there is an advantage that it is not necessary to use a magnet according to the model, and quality control of the magnet is easy.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, in which Fig. 1 is an overall plan view, Fig. 2 is a side sectional view of the main part, Fig. 6 is a partial sectional view, and Fig. 4 is a side sectional view. It is. 2... Drawing board 4, 6... Vertical rail 8... Weight insertion space 10... Magnet 12... Steel plate 14. 16... Magnet 18... Magnet 20.
...Vertical cursor 22... Iron plate 24... Guide roller 26... Rail surface 52... Horizontal ruler 5
0...Vertical cursor patent applicant Muto Kogyo Co., Ltd.

Claims (1)

[Claims] 1) A pair of vertical rails 4 and 6 fixed to both sides of the drawing board 2
, nine vertical cursors 20.50 movably arranged along the vertical rails 4, 6, and a horizontal ruler 52 suspended between the vertical cursors 20.50. A magnet 10, 10/ is disposed on each outer side of the vertical cursor 20. Magnets 18, 18' are disposed on the sides, and the magnets 10, 18, 10, 18, and 18/ facing each other are magnetized to the two sides of the drawing board on the side of the vertical cursor 20, 50 by means of an attractive magnetic force applied to the magnets 10, 18, 10/, and 18/ facing each other. A ruler guide device for a parallel ruler, characterized in that it supports a downward vertical load.