JPH0445358B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vertical rail guide device for a rail type universal parallel ruler, and is characterized in that the frictional force of the vertical rail guide portion is reduced by using the attractive force of a magnet. .

Using the repulsive force of the magnet, the horizontal cursor supporting the upper end of the vertical rail is urged in the floating direction relative to the horizontal rail, and the tail side of the vertical rail is urged in the floating direction relative to the drawing surface. A device has already been developed by the applicant of the present invention, which reduces the running friction of the vertical rail.

When the repulsive force of a magnet is used to reduce the running friction force of a vertical rail, the following defects exist. In other words, the drawing board to which this type of rail-type flexible parallel ruler is attached is generally a drawing board that can be tilted between approximately horizontal to the floor and approximately 80 degrees in the upright direction. is supported by Therefore, when the drawing board is horizontal to the floor, the load applied to the horizontal rail in the direction perpendicular to the drawing surface of the vertical rail is the largest, and the drawing board is approximately parallel to the floor. 80°
When the rail is tilted, the load applied to the horizontal rail in the direction perpendicular to the drawing surface of the vertical rail is the smallest. This means that if the load at the top end of the vertical rail is supported by the repulsive force between the magnet placed on the horizontal rail side and the opposite magnet placed on the horizontal cursor side, the inclination angle of the above board will be Due to the change in , the opposing gap between the magnets changes greatly.

In this way, by changing the inclination angle of the drawing board,
If the opposing gap between the magnet that supports the load of the vertical rail and the magnet that opposes it changes significantly, a large error will occur in the horizontality of the vertical rail with respect to the drawing surface, making precise drawing work difficult. becomes. Also, if you want to set the opposing gap between the magnets to a predetermined value when the drawing board is set at a predetermined angle, high precision is required in selecting the magnetic force of the magnets.
There was a troublesome quality control problem in that the most suitable magnet had to be selected and adopted for each model of rail type flexible parallel ruler.

The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 1, 2 is a drawing board, which is fixed to a drawing board support frame of a drafting table (not shown). The drawing board support frame of the drawing table is in a horizontal state with respect to the floor surface,
It is configured so that it can be set to any inclination angle between the state where it stands up at approximately 80 degrees with respect to the floor surface. 4 is a horizontal rail fixed to the upper edge of the drawing board 2 by a vise-type fixture 6, and a pair of upper horizontal rail surfaces 8, 10 and a pair of lower horizontal rail surfaces are attached to this over the entire length in the longitudinal direction. Horizontal rail surface 12, 14
Further, vertical rail surfaces 16 and 18 are formed over the entire length of the horizontal rail 4 approximately in the center on the lower surface side of the horizontal rail 4. 20 is a horizontal cursor, and a plurality of vertical safety colors 22 are attached to this cursor.
, one or more vertical safety rollers 24 , a plurality of horizontal rollers 26 , and one or more horizontal rollers 28 are rotatably supported. It is in rotatable contact with the vertical rail surface 18. A groove is formed in the side portion of the horizontal rail 4 over the entire length in the longitudinal direction, and a magnet 30 made of an elongated magnetic rubber is fitted into the groove. An iron plate 32 is fixed to the inner surface of the magnet 30, and the upper and lower surfaces of the iron plate and the magnet 30 are fixed to the wall surface of the groove. On the outer surface of the magnet 30 perpendicular to the second surface of the drawing board, there are magnetic pole tracks extending in the longitudinal direction from above in the drawing.
Multiple rows are formed in the order of NSNSSNS. 34 is a vertical rail, and a bracket 3 is attached to the upper end of this rail.
The upper part of the bracket 6 is fixed, and the lower part of the bracket 36 is fixed to the upper surface of the stand 38. Said stand 38
is rotatably supported by a shaft 40 at the rising portion of the horizontal cursor 20 about an axis parallel to the longitudinal axis of the horizontal rail 4. A groove is formed on the side of the table 38, and a magnet 42 is fitted into the groove. An iron plate 44 is fixed to the inner surface of the magnet 42, and the upper and lower surfaces of the iron plate and the magnet 42 are fixed to the wall surface of the groove. On the side surface of the magnet 42 facing the magnet 30, a plurality of magnetic pole tracks extending in the longitudinal direction are formed in the order of SNSSNSN from the top in the figure. Reference numeral 46 denotes a guide rail fixed to the lower edge of the drawing board 2 by a vise-type fixture, and the guide rail 46 has a guide surface 46a set horizontally with respect to the drawing board 2 surface. . A groove is formed along the entire length of the guide rail 46 in the side perpendicular to the plane of the drawing board, and a long magnet 50 is fitted into the groove. An iron plate 52 is fixed to the magnet 50, and the upper and lower surfaces of the iron plate 52 and the magnet 50 are fixed to the wall surface of the groove. On the side surface of the magnet 50 perpendicular to the plane of the drawing, from above, as shown in FIG.
Multiple examples of magnetic pole tracks extending perpendicular to the page are formed in the order NSNSNSNS. 54 is an arm member fixed to the tail of the vertical rail 34, and the safety roller 5 is rotatably attached to this arm member about an axis parallel to the longitudinal axis of the vertical rail 34.
6 is rotatably supported. A groove is formed in the side of the vertical part of the arm member 54 that faces parallel to the side surface of the guide rail 46, and a magnet 58 is inserted into the groove.
is fitted and fixed. A plurality of magnetic pole tracks are formed on the magnet 58 in the order of SNSSNSN from the top as shown in FIG. The strength of the attraction between the opposing magnets 50 and 58 and the strength of the attractive force acting between them is set to be approximately the same as the strength of the attraction between the magnets 42 and 30 and the attraction between them. There is. The total weight of the vertical rail 34 is supported by the attractive force acting between the magnets 50 and 58 and between the magnets 42 and 30, and the vertical rail 34 is held in space. When the vertical rail 34 is in a space-maintained state, the safety rollers 22, 24 are connected to the upper and lower horizontal rail surfaces 8, 12, and 1.
0 and 14 with a slight gap, and the safety roller 56 faces the guide surface 46 of the guide rail.
They face each other with a slight gap between them. Among the attractive magnetic forces between the magnets 50 and 58 and 42 and 30, the magnetic force components in the longitudinal direction of the vertical rail 34 substantially cancel each other out, so the horizontal cursor 20 has There is no unbalanced load applied horizontally and in a direction perpendicular to the longitudinal direction of the horizontal rail 4, and the horizontal rollers 26 and 28 are placed on the vertical rail surface 1.
6 and 18. The vertical rail 34
A vertical cursor 60 is movably attached to the cursor 60, and a head 64 is connected to the vertical cursor 60 via a hinge member 62. A known head floating mechanism (not shown) is provided between the vertical cursor 60 and the hinge member 62, and is configured to maintain the head 64 in a floating state from the surface of the drawing board 2 by this mechanism. ing. Straight edges 66 and 68 are removably fixed to the mounting plate of the head 64.

Next, the operation of this embodiment will be explained.

When the handle of the head 64 is pressed in any direction horizontal to the two sides of the drawing board, the horizontal cursor 20
moves along the horizontal rail 4 guided by the vertical rail surfaces 16 and 18, and the vertical cursor 60 moves along the vertical rail 34, thereby moving the head 64 to any position on the drawing board 2. can be moved to position. The attractive magnetic force acting between the magnets 50 and 58 and between the magnets 42 and 30 prevents the arm 54 and the horizontal cursor 20 from falling in the direction perpendicular to the two surfaces of the drawing board, and both ends of the vertical rail 34 are The safety rollers 22, 24, and 56 float on the rail 4 and the guide rail 46, and the safety rollers 22, 24, and 56 respectively
2, 14 and the guide surface 46a while moving on the horizontal plane and the guide surface.

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 horizontal rail surface 12, 1 due to the total weight of the vertical rail 34 side
The load on 4 in the direction perpendicular to the two planes of the drawing board changes in the direction of reduction. However, due to this load change, the magnets 42, 58 slightly change upward relative to the magnets 30, 50;
The upper end U never moves above the upper end V of the magnets 30, 50. No matter how large the load change becomes, the magnets 42 and 58 are stabilized when the level of their upper ends U is slightly lower than the upper ends V of the magnets 30 and 50. This means that even if a magnet with a magnetic force considerably stronger than the optimum magnetic force for supporting the total weight of the vertical rail 34 is used, the vertical rail 34 will not float too high relative to the two surfaces of the drawing board. That is,
As long as the magnet has a predetermined magnetic force or more, a considerable range of magnet selection is allowed.

As described above, in the present invention, both ends of the vertical rail are biased in the direction of floating with respect to the vertical rail guide surface by the attractive force of the magnet, so even if the load of the vertical rail on the vertical rail guide surface changes. , it is possible to reduce the change in the height level of the vertical rail relative to the drawing board surface, and there is no requirement for precision in the magnitude of the magnetic force of the magnet. There is an advantage that it is not necessary to use magnets, and quality control of the magnets is easy.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is an overall plan view, FIG. 2 is a side sectional view of the main part, and FIG. 3 is a side sectional view of the main part. 2...Drawing board, 4...Vertical rail, 20...Horizontal cursor, 30...Magnet, 34...Vertical rail, 40...
...Axis, 42...Magnet, 46...Guide rail, 5
0...Magnet, 54...Arm member, 56...Safety collar, 58...Magnet, 60...Vertical cursor,
64...head.

Claims (1)

[Claims] 1 A horizontal rail fixed to the upper edge of the drawing board, a horizontal cursor movably disposed along the horizontal rail, and an upper end rotating about an axis parallel to the longitudinal axis of the horizontal rail. A vertical rail that is freely pivoted to the horizontal cursor, a vertical cursor that is movably attached to the vertical rail, a head that is connected to the vertical cursor, and a straightedge that is fixed to a ruler mounting plate of the head. In the vertical rail guide device for a rail type universal parallel ruler, a magnet is disposed on the outer surface of the horizontal rail perpendicular to the drawing surface over the entire length in the longitudinal direction, and the magnet has a predetermined different polarity. A magnet is disposed on the upper end side of the vertical rail so as to face each other with an interval of a magnet is disposed on the tail end side of the vertical rail so that different poles of the magnet face each other with a predetermined interval, and an action is applied between the mutually opposing magnets on the upper end side of the vertical rail. A downward load in a direction perpendicular to the drawing surface at both ends of the vertical rail is supported by the attractive magnetic force acting between the magnets facing each other on the tail end side of the vertical rail. A vertical rail guide device for a rail type flexible parallel ruler, characterized by: