JPS6111033Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a vertical or horizontal scale that is attached to a head section that is movable on the drawing board using guide rails and support arms attached to the side edges of the drawing board. In particular, a magnetic absorption force is applied between the scale and the drawing board, so that the scale can be easily brought into close contact with the drawing board surface.

A scale device in a conventional drawing machine will be explained with reference to FIG. The drawing machine of the example shown here is of a so-called track type, and a horizontal rail 2 is fixed to the upper edge 1a of the drawing board 1 by a fixing means (not shown). The vertical rail 3 is installed so that it can move freely in the left and right directions in the figure, and the head part 4 is attached so that it can be moved in the vertical direction in the figure along the vertical rail 3, and the scale of this head part is The vertical scale 6A and the horizontal scale 6B are mounted on the mounting plate 5 so as to protrude perpendicularly to each other, and by moving the head section 4 in any direction on the drawing board 1, each scale 6A, 6B can be placed at any position on the drawing board 1 and at any angle.

In addition, during the drafting work, the above scale 6A,
When it is desired to fix the installation position of 6B, this is done by operating a brake device (not shown) provided between the head portion 4 and the vertical rail 3 and a brake device provided between the horizontal rail 2 and the vertical rail 3 (not shown).
The head section 4 serves as an operating grip section for operating the scale, and is provided with an angle setting operating lever and an operating lever.
This is done by pressing it against the surface.

However, as shown in the figure, each scale 6A, 6B extends vertically from the head section 4 where the grip section is located.
Since the scales protrude horizontally, it is difficult to ensure that the entirety of these scales 6A and 6B is in close contact with one surface of the drawing board. In particular, if the scales 6A and 6B are even slightly warped, the warpage may be magnified at the tip of each scale, that is, the part furthest from the head 4.
There were times when it was difficult to draw accurate drawings.

In addition, various measures have been taken to achieve a close contact between the scales 6A and 6B, but all of them not only complicate the structure, but also require that the scales 6A and 6B be attached and removed to replace other scales. Even when assembled, it is not possible to obtain a uniformly sufficient adhesion state.

In addition, since the brake device is installed inside each rail 2, 3, it complicates the structure of the rail body and makes assembly and processing difficult. Due to the structure, it could not be installed on the head section 4 and had to be installed on the vertical rail 3. Therefore, when operating the brake, the operator must support the head section 4 with one hand and hold the writing instrument with the other hand. It was necessary to operate the brake with the hand holding it, which was troublesome to operate. Further, if the brake is operated with the hand supporting the head section 4, there is a risk that the head section 4 will not be supported and the position of the head section 4 will shift, making it impossible to fix it in an accurate position.

Therefore, the present invention was devised in view of the actual situation of the conventional drawing machine described above, and an object of the present invention is to easily and accurately realize the state in which the scale is in close contact with the drawing surface.

Furthermore, another object of the present invention is to be able to fix the installation position of the scale with a simple operation without relying on a brake mechanism that is complicated in terms of structure and operation, unlike the conventional brake devices mentioned above. The purpose of this is to enable easy switching from a free state to a free state.

In other words, the drawing machine scale device of the present invention is
In a scale attached to a movable head so as to be movable vertically and horizontally on a drawing board, the scale is provided with a magnetically absorbing body disposed on the drawing board side and an electromagnet capable of absorbing magnetism. , the power supply connection terminal of the electromagnet is provided on the scale and the head mounting part so that it can be connected to the power supply output connection terminal provided on the scale mounting plate when the scale is mounted on the scale mounting plate of the head part; The present invention is characterized in that it is provided with a switch capable of opening and closing the power supply circuit of the electromagnet.

An embodiment of the present invention shown in the drawings will be described below. First, FIGS. 2 and 3 show a scale 6 to which the present invention is applied.

This scale 6 has both longitudinal edges 6a and 6b.
Dimensional scales 7a and 7b are arranged along the respective scales, and metal engaging bodies 8A and 8B for attachment to the scale mounting plate of the head portion, which will be described later, are protruded from the upper surface near both ends 6c and 6d, respectively. has been done.
Note that the above configuration is no different from a conventional scale. In the present invention, an electromagnet 9 is integrated into the scale 6. In the illustrated example, four electromagnets 9 are distributed in the length direction of the scale. Each electromagnet 9 is connected to a lead wire 1 buried within the scale 6.
Connected in parallel by 0A and 10B,
One end of each of the lead wires 10A, 10B is connected to connection terminals 11A, 11B provided on the scale surface on both sides of the one metal engaging body 8A, and the other ends of each are connected on both sides of the other metal engaging body 8B. It is connected to connection terminals 12A and 12B provided on the surface of the scale. The magnetic absorption force of each electromagnet 9 is directed downward in FIG.
In other words, it acts on the drawing board side.

Further, FIG. 4 shows the head section 13 to which the scale 6 is assembled and used.
3 is connected and supported by a support arm 14 to a vertical cursor in a vertical rail (not shown).
The support portion 1 provided at the tip of the support arm 14 is
A scale mounting plate 17 and a protractor plate 18, which are integrated with an operation grip 16, are rotatably attached to the scale 5. Engagement grooves 19A and 19B are formed in each scale attachment portion 17A and 17B of the scale attachment plate 17 so that the metal engagement bodies 8A and 8B of the scale 6 can be relatively fitted into each other. Groove 1
When the scale 6 is assembled and mounted by fitting the engaging bodies 8A, 8B to the scales 9A, 19B, each of the connection terminals 11A, 11B or 12A, 1 of the scale
Power output connection terminals 20A, 20 are provided at positions facing the surface of the scale 6 on the lower surface of each of the scale mounting portions 17A, 17B in the figure so as to be electrically connected to the scales 2B.
B, 21A, and 21B are provided. Also,
These terminals 20A, 20B and 21A, 21B
is connected to a power source (not shown) through lead wires 22A and 22B, and a switch button 2 provided on the operating grip 16 is connected to the middle of the lead wire.
Power switches opened and closed by 3 are connected in series. The power can be turned on and off using the switch button 23.

Incidentally, FIG. 5 shows a state in which the scale 6 is assembled to the head portion 13. As is clear from this drawing, the power output terminals 20A, 20B and 21A, 21 provided on the head section 13 side
B has the tip of the terminal elastically energized, and connects to the corresponding connection terminal 11A, 11B or 12A, 1 on the scale 6 side.
If it is brought into pressure contact with the surface of 2B, a more stable conductive state can be easily obtained. Further, in FIG. 5, 24 is a drawing board, and in this example, the drawing board 24 has at least a surface portion or the whole made of a steel plate or other magnetically absorbing material, so that it can be relatively attracted to the electromagnet 9 of the scale 6. It is formed like this. Therefore, when the scale 6 is attached to the head section 13 and the scale 6 is placed so as to be superimposed on the drawing board 24, when the power switch is turned on using the switch button 23, the electromagnet 9 is energized. A magnetism absorbing effect acts between the drawing board 24 and the drawing board 24, and the scale 6 is firmly attached to the drawing board 24 surface. Furthermore, if a polarity switching means is interposed in the power supply circuit of the electromagnet 9 and the drawing board 24 is provided with polarity,
The electromagnet 9 acts so that the scale 6 repels the drawing board 24, making it easy to float the scale 6 and preventing the scale from rubbing on the drawing when moving the scale.

Furthermore, if the electromagnet 9 is made to have a strong magnetic absorption force, it will be in close contact with the drawing board 24 when energized, and
A fixed installation state of the scale can be easily obtained without providing a brake device in the conventional drawing machine described above. In the present invention, switching between the close contact and free states is possible simply by operating the switch button 23 of the operating grip 16, so the grip 1 can be moved with the hand supporting the grip 16, the palm of the hand, or the fingers.
It has the advantage that it can be operated while supporting 6.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing an example of a conventional drawing machine, Fig. 2 is a perspective view showing a scale portion of the present invention, Fig. 3 is an enlarged sectional view, and Fig. 4 is a head portion of the present invention. FIG. 5 is a schematic perspective view, and FIG. 5 is a partially sectional side view showing the scale in use, with the scale assembled to the head. 6...Scale, 9...Electromagnet, 13...Head section, 11A, 11B, 12A, 12B...Connection terminal, 20A, 20B, 21A, 21B...Power output connection terminal, 23...Switch button, 24... ...Drawing board.

Claims (1)

[Scope of utility model registration request] In a scale attached to a movable head so as to be movable vertically and horizontally on a drawing board, the scale is provided with a magnetically absorbing body disposed on the drawing board side and an electromagnet capable of absorbing magnetism. , the power supply connection terminal of the electromagnet is provided on the scale and the head mounting part so that it can be connected to the power supply output connection terminal provided on the scale mounting plate when the scale is mounted on the scale mounting plate of the head part; A scale device for a drawing machine, characterized in that the scale device is provided with a switch capable of opening and closing the power supply circuit of the electromagnet.