JPS6244652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a free cursor with a marking device used as an input device for a coordinate reading device.

A stylus pen type and a free cursor type are used as input devices for conventional coordinate reading devices. The former stylus pen method is generally used because it allows the incorporation of a ballpoint pen or the like.
However, this method has a drawback that reading accuracy decreases because a coil that induces magnetic lines of force is installed in a ballpoint pen that is placed approximately upright with respect to the measurement point, so the diameter of the ballpoint pen becomes thicker and the measurement point becomes difficult to see. .

On the other hand, the latter free cursor method installs a coil that induces magnetic lines of force near the measurement surface.
A marker is provided inside this coil,
Since the measurement point is seen through the space between the coil and the marker, it is easier to see the measurement position compared to the stylus pen method, so if high reading accuracy is required, the free cursor method is recommended. is used.

As shown in FIG. 1, the conventional free cursor with a marking device has a hole 2 penetrating from the lower measuring surface 1a of one end of the free cursor main body 1 to the upper end surface.
A ring-shaped coil 3 that induces magnetic lines of force on the inner peripheral surface of
A transparent piece 4 is fixed inside this coil 3, and a cross mark 5 is provided at the lower center position of this piece 4 for alignment with a measurement point (not shown) of the object to be measured. A hole 4a for inserting a marker 6 is formed in the portion.

The marker 6 is inserted into a drive coil (not shown) provided in a marker drive device 7 that protrudes from the upper end surface of the free cursor main body 1, and when the drive coil is excited, the marker 6 protrudes from the tip and drives the measurement point. It is formed to be marked at a proximal position and retracted to its original inward position by a spring (not shown) when the drive coil is demagnetized.

A keyboard 9 having a plurality of keys 8 attached thereto is fastened to the upper surface of the other end of the free cursor main body 1.

However, in the above configuration, since the transparent piece 4 and the marker 6 are provided within the coil 3, the diameter of the coil 3 becomes large, thereby increasing the overall shape. Also, coil 3 is cross mark 5
Since the marker 6 is provided around the horizontal direction, the marker 6 cannot be inserted from the side, and must necessarily be inserted from above. Therefore, the marker driving device 7 significantly obstructs the visual field of the cross mark 5. Furthermore, since the marker 6 marks a position near the measurement point, if the shape is complicated, the measurement position may become unclear and the measurement must be performed again.

An object of the present invention is to provide a free cursor with a marking device that eliminates the above-mentioned drawbacks and enables easy and highly accurate measurement.

Accordingly, the configuration of the present invention includes a half mirror that is inclined at a predetermined angle with respect to the downward measurement surface in the free cursor body and that overlaps the cross mark formed in the body with the measurement point, and a half mirror that faces the measurement point. a marker drive device that is tilted at a predetermined angle in the opposite direction of the half mirror with respect to the measurement surface and directly marks the measurement point when protruding; and a cursor that is fixed at a predetermined distance away from the measurement point and that A coil that induces lines of magnetic force is provided in the section.

Embodiments will be explained below with reference to FIGS. 2 and 3 showing embodiments. In the figure, reference numeral 10 denotes a free cursor main body, and a hole 12 penetrating from the lower measurement surface 11 to the upper end surface, leaving the side wall 1a at one end, and this hole 12.
A hole 13 is formed diagonally through the hole 13 toward the upper end surface, and a space 14 is formed at the other end that opens toward the upper end surface, leaving the lower bottom wall 10b and side wall 10c. A half mirror 15 is fixed in the hole 12 at an angle of 45 degrees with respect to the measurement surface 11. A cross mark 16 is formed on the side wall 10a. A protective glass 17 is fixed to the upper end of the hole 12.

Therefore, the half mirror 1 is smaller than the protective glass 17.
5, when the cross mark 16 coincides with the measurement point of the object to be measured, polymerization can occur. Reference numeral 18 denotes a marker driving device, which is fixed in the hole 13 and includes a ring-shaped driving coil 20;
Inserted into this drive coil 20, the drive coil 2
When the drive coil 20 is demagnetized, the marker 19 is attached to a piece 22 fixed to the end of the drive coil 20. It is made up of a spring 21 that can be retracted until it hits, and a cap 23 that locks the inner upper end.
Reference numeral 24 is a rod-shaped lamp and is fixed at a lower position inside the hole 13, illuminating the inside of both holes 12 and 13 so that the overlapping state of the cross mark 16 and the measurement point can be easily seen through the protective glass 17. . 25,
26 are a first coil and a second coil that induce magnetic lines of force, respectively.
The first coil 25 is fixed to the lower bottom wall 10b such that its center position is a distance L away from the measurement point, and the second coil 26 is fixed to the lower bottom wall 10b so that its center position is located at a distance L from the measurement point. flange 2 so that it is located a distance L away from the center position of flange 25.
It is fixed at 7. This flange 27 is fastened to the lower bottom wall 10b with screws 28 so that its horizontal position can be adjusted.

29 is the keyboard, and the free cursor body 10
A plurality of keys 30 are attached to the space portion 14 so as to tightly secure the space portion 14 therein. 31 is a conducting wire, one end is connected to a drafting device (not shown), and the other end is connected to the drive coil 20, the first and second coils 25,
26, and key 30.

With the above configuration, first, the cross mark 16 and the measurement point are visually observed through the half mirror 15 through the protective glass 17, and the free cursor main body 10 is moved until they overlap each other. After that, when the cross mark 16 and the measurement point overlap, turn on the key 30.
Then, the first coil 25 and the second coil 28 are excited in this order, and measurement points are calculated and input. On the other hand, when the drive coil 20 is excited, the marker 19 protrudes and the tip of the marker 19 directly marks the measurement point.

After that, when the key 30 is turned OFF, the first and second
The coils 25 and 28 are demagnetized, and the drive coil 2
0 is demagnetized, the marker 19 is retracted inward by the spring 21, and the measurement is completed.

Therefore, the present invention has the following effects.

(b) Since alignment is performed by visually observing the half mirror through the protective glass and overlapping the cross mark and the measurement point, it is easy to align the measurement point and the cross mark, and the alignment is accurate. can be done.

(b) Operation is easy because marking is done directly at the measurement point.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing a conventional free cursor with a marking device; Figs. 2 and 3 show an embodiment of the present invention; Fig. 2 is a sectional front view thereof;
The figure is a plan view thereof. 10... Free cursor body, 15... Half mirror, 16... Cross mark, 17... Protective glass, 18... Marker drive device, 19 ... Marker, 20... Drive coil, 21... Spring, 22... ...Peace, 23...Cap, 24...
...Lamp, 25...First coil, 26...Second coil, 27...Flange, 28...Screw, 29...
...keyboard, 30...keys.

Claims (1)

[Claims] 1. In a free cursor with a marking device used as an input device of a coordinate reading device, the free cursor body is inclined at a predetermined angle with respect to the lower measurement surface, and the cross mark formed in the body is superimposed on the measurement point. a half mirror, a marker driving device that is tilted at a predetermined angle in the opposite direction of the half mirror with respect to the measurement surface so as to face the measurement point, and directly marks the measurement point when protruding; A free cursor with a marking device for use in a coordinate reading device, characterized in that the cursor is fixed at a position and is provided with a coil for inducing lines of magnetic force in a cursor portion other than a measurement point.