JPH0445359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cursor guiding device for a rail-type flexible parallel ruler, coordinate analyzer, parallel ruler, etc., and is characterized in that the running friction of the cursor is reduced by using the attractive force of a magnet. That is.

The applicant has already developed a device in which the repulsive force of a magnet is used to bias the cursor in the floating direction relative to the rail, thereby reducing the running friction of the cursor along the rail. When the repulsive force of a magnet is used to reduce the running friction of a cursor, the following defects occur. That is, in this type of device, the rail is supported by a drawing board that can be tilted between a state that is substantially horizontal to the floor surface and a state that is tilted at approximately 80° in the upright direction. Therefore, when the drawing board is horizontal to the floor surface, the load applied to the rail side and the cursor side in the direction perpendicular to the drawing surface is the largest, and the drawing board is approximately parallel to the floor surface. When the rail is tilted at 80 degrees, the load applied to the rail side in the direction perpendicular to the drawing surface on the cursor side is the smallest. This means that when the load on the cursor side is supported by the repulsive force between the magnet placed on the rail side and the opposing magnet placed on the cursor side, the change in the inclination angle of the drawing board will cause As a result, the opposing gap between the magnets changes greatly.
If the opposing gap between the magnets changes greatly in this way, the cursor will move up and down significantly with respect to the rail, causing various problems. Furthermore, when it is desired to set the level of the cursor relative to the rail to a predetermined state, high precision is required in selecting the magnetic force of the magnet, and there is a problem in terms of quality control that the optimum magnet must be selected and adopted.

The present invention aims to eliminate the above-mentioned defects.

The structure of the present invention will be explained below with reference to an embodiment of a rail type flexible parallel ruler.

In FIG. 1, reference numeral 2 denotes 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 drafting table is configured so that it can be set to any inclination angle between a horizontal state with respect to the floor surface and a state where it stands up at approximately 80 degrees with respect to the floor surface. . Reference numeral 4 denotes a horizontal rail fixed to the upper edge of the drawing board 2 by a vise-type fixture, and a pair of upper horizontal rail surfaces 6, 8 extending over the entire length in the longitudinal direction,
A pair of lower horizontal rail surfaces 10, 12 are formed;
Furthermore, vertical rail surfaces 14 and 16 are formed on the vertical part formed approximately at the center of the lower surface of the horizontal rail 4.
It is formed over the entire length of. 18 is a horizontal cursor, which has multiple vertical safety colors 2
0, one or more vertical safety rollers 22, a plurality of horizontal rollers 24, and one or more horizontal rollers (not shown) are rotatably supported, and among the horizontal rollers, the former horizontal roller 24 is on the vertical rail surface 14, and the latter horizontal roller is on the vertical rail 1.
6 in a rotatable manner. A groove is formed on the outer surface of the vertical portion of the horizontal rail 4 over the entire length in the longitudinal direction, and magnets 26 and 28 are fixed to the groove. A plurality of rows of magnetic pole tracks are formed on the side surfaces of the magnets 26 and 28 perpendicular to the two planes of the drawing board in the order of SNS from the top in FIG. Reference numeral 30 denotes a vertical rail, and a bracket 32 is fixed to the upper end of the vertical rail.
An axis 34 is rotatably attached to the rising edge of the horizontal cursor 18.
supported. Attachment pieces 36 and 38 are provided upright on the upper surface of the horizontal cursor 18, and magnets 40 and 42 are installed in grooves formed on the inner surfaces of these pieces.
is fixed opposite to. The magnets 40, 42
On the side surface facing the magnets 26 and 28, a plurality of rows of magnetic pole tracks are formed in the order of NSN from the top in the figure. The safety rollers 20, 22 are rotatably supported on the mounting pieces 36, 38, and the safety rollers 20, 22 are provided with predetermined intervals between the upper and lower horizontal rail surfaces 6, 10 and between 8, 12. It is located. Reference numeral 44 denotes an arm member fixed to the tail of the vertical rail 30, on which a tail roller is rotatably supported, and the tail roller is placed on a guide rail 46 fixed to the drawing board 2. . In FIG. 3, 48 and 50 are vertical parts formed on the vertical rail 30, and a vertical rail surface is formed on the inner surface of this part. The surfaces of two horizontal rollers 54 rotatably supported by the vertical cursor 52 are in contact with the one vertical rail surface, and the two horizontal rollers 54 are in contact with the vertical cursor 52 and the two horizontal rollers 54 are in contact with the other vertical rail surface.
The surface of one horizontal roller rotatably supported in the middle is in contact with the surface of the roller.

Grooves are formed on the outer surfaces of the vertical parts 48, 50, and magnets 56, 58 are fixed to the grooves over the entire length of the vertical rail 30 in the longitudinal direction. 60,62
is a mounting piece protruding from the vertical cursor 52, and magnets 64, 66 are installed in the grooves formed on the inner surface of these pieces.
are fixedly provided opposite the magnets 56 and 58. A third magnet is provided on the externally exposed surface of the magnets 56 and 58.
In the figure, a plurality of magnetic pole tracks are formed in the order of SNS from the top, and a plurality of magnetic pole tracks are formed in the order of NSN from the top on the externally exposed surfaces of the magnets 64 and 66. The opposing gaps between the magnets 64 and 56 and between the magnets 66 and 58 and the strength of each attractive magnetic force are set to be substantially the same. The total weight of the vertical cursor 52 is supported by the attractive forces acting between the magnets 64 and 56 and between the magnets 66 and 58, and the vertical cursor 52 is held in space. When the vertical cursor 52 is in a space-maintained state, the safety rollers 68, 70 rotatably supported by the mounting pieces 60, 62 have some gaps with respect to the upper and lower horizontal rail surfaces 72, 74 and 76, 78. They are facing each other.

A head 82 is connected to the vertical cursor 52 via a hinge member 80. The vertical cursor 5
A known head floating mechanism (not shown) is provided between the head 82 and the hinge member 80, and is configured to maintain the head 82 in a floating state from the surface of the drawing board 2 by this mechanism. Straight rulers 84 and 86 are removably fixed to the ruler mounting plate of the head 82.

Next, the operation of this embodiment will be explained.

When the handle of the head 82 is pressed in any direction horizontal to the two sides of the drawing board, the horizontal cursor 18
moves along the horizontal rail 4 guided by the vertical rail surfaces 14 and 16, and the vertical cursor 52 moves along the vertical rail 30, thereby moving the head 82.
can be moved to any position on the drawing board 2. The attractive magnetic force acting between the magnets 40 and 26 and between 42 and 28 prevents the horizontal cursor 18 from falling in a direction perpendicular to the two sides of the drawing board, and the horizontal cursor 1
8 floats against the horizontal rail 4 and safety roller 2
0 and 22 run in a floating state on the horizontal rail surfaces 10 and 12. Similarly, the vertical cursor 52 also travels along the vertical rail 30 while floating relative to the vertical rail 30. For example, when the inclination angle of the drawing board 2 changes from horizontal to the floor to approximately 80 degrees, the total weight on the horizontal cursor 18 side with respect to the horizontal rail surfaces 10, 12, The load in the vertical direction changes in the direction of reduction. However, due to this load change, the magnets 40 and 42 are slightly displaced in the upward direction relative to the magnets 26 and 28;
The amount of increase is minute, and the magnet 40,
The upper end of magnet 42 never moves above the upper end of magnets 26 and 28. That is, the magnets 40 and 42 are stable when their upper end level is slightly lower than the upper level of the magnets 26 and 28, no matter how large the load change is. This means that the horizontal cursor 18 will not rise too high relative to the horizontal rail 4 even if a magnet with a much stronger magnetic force than the optimum magnetic force for supporting the total weight of the vertical rail 30 is used. In other words, any magnet with magnetism higher than a predetermined level is sufficient, and a considerable range of magnet selection is allowed. The vertical cursor 52 has the same effect as that described for the horizontal cursor 18. As mentioned above, the vertical movement width of the cursor can be set small with respect to the rail in the case of a rail type flexible parallel ruler.
The height of the vertical rail 30 relative to the two drawing board surfaces can be made substantially constant, and the levelness of the vertical rail relative to the drawing board surface can be easily set. Furthermore, since the height of the vertical cursor 52 with respect to the vertical rail 30 can be made substantially constant, the intervals between the upper and lower horizontal rail surfaces 72 and 74 and between 76 and 78 can be shortened, making it possible to reduce the size of the vertical rail 30. It is possible to aim for Also,
In the case of a rail-type coordinate analyzer, the height of the reading head connected to the vertical cursor relative to the drawing surface can be kept constant, and reading accuracy can be improved. Furthermore, in the case of a lay-type parallel ruler, the horizontal ruler can be set in an optimum proximity state to the drawing surface.

As described above, in the present invention, the cursor is biased in the direction of floating relative to the rail by the attractive force of the magnet, so even if the load of the cursor on the rail changes, the change in the height level of the cursor relative to the rail is minimized. Moreover, since precision is not required for the magnitude of the magnetic force of the magnet, there is an advantage that quality control of the magnet is easy.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention, in which FIG. 1 is an overall plan view of a rail type universal parallel ruler, FIG. 2 is a side view, and FIG. 3 is a sectional view. 2...Drawing board, 4...Horizontal rail, 18...Horizontal cursor, 26, 28...Magnet, 30...Vertical rail,
32...Bracket, 34...Shaft, 40, 42...
...Magnet, 52...Vertical cursor, 60, 62...Mounting piece, 64, 66...Magnet, 82...Head.

Claims (1)

[Claims] 1. In a cursor guide device for a rail-type flexible parallel ruler, etc., comprising a drawing board, a long rail supported by the drawing board, and a cursor movably arranged along the rail, Magnets are arranged parallel to each other over the entire length in the longitudinal direction on each of the facing surfaces perpendicular to the drawing surface, and different poles of the magnets are placed on the cursor side so that different poles face each other at appropriate intervals. A rail characterized in that magnets are arranged and the downward load of the cursor in a direction perpendicular to the drawing surface is supported by an attractive magnetic force acting between the magnets having different polarities facing each other. Cursor guide device for type-free parallel rulers, etc.