JP2536339Y2 - Drafting machine equipped with a display device for angles etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a drafting machine capable of displaying an angle of a ruler using a magnetic encoder.

2. Description of the Related Art Recently, a drafting machine that digitally displays an angle of a ruler and a position in an X direction or a Y direction is used. In this type of drafting machine, an optical encoder including a disk-shaped encoder plate or a long encoder plate on which an optical reading scale pattern is formed, and an optical reading detector arranged opposite to the encoder plate. Using a dynamic encoder. Then, with the rotation or movement of the ruler, an optical change in which the optical encoder plate rotates or moves is detected by an optical reading detector, and the movement is AD-converted, and the incremental digital pulse of this encoder is detected. The rotation amount and the position of the ruler are digitally displayed based on the count position output or the absolute digital pulse position output.

[Problem to be Solved by the Invention] In a conventional drafting machine, an encoder used for displaying a rotation amount of a ruler or the like is generally an optical type which is easy to be attached to an object to be measured. However, with optical encoders,
Since the power consumption is large and the drafting machine is often used continuously for a long time, it requires a lot of power and is uneconomical. Further, if dust or dust adheres between the optical reading scale pattern and the optical reading detector, there is a problem that detection becomes impossible or an error occurs.

Therefore, an object of the present invention is to make it possible to digitally display the angle and the like of a ruler of a drafting machine with a small amount of electric power, and also to maintain good detection accuracy for dust and dirt.

Means for Solving the Problems In order to achieve the above object, the present invention provides a drafting machine in which a head connected to a ruler mounting plate and rotating integrally therewith is held through a cylindrical holding portion of a support member. The angle and the like can be displayed by incorporating a magnetic encoder.

Therefore, a magnetic sensor is provided on one of the surface of the cylindrical holding portion of the support member and the side of the ruler mounting plate facing the same, and a magnetic scale is provided on the other, and a detection signal from the magnetic sensor is transmitted to the angle display device. I did it.

In order to indicate the movement position of the scale, a guide member movable in the X direction and the Y direction perpendicular to the holding portion of the head is provided, a magnetic scale is mounted on each of the guide members, and a magnetic sensor is opposed to them. It may be provided.

[Operation] In the above-described drafting machine, the ruler is rotated or the X direction or the Y direction is set.
The magnetic sensor detects a magnetic change from the magnetic scale with the movement in the direction, and transmits a detection signal corresponding to the rotation amount or the movement amount to the display device. Therefore, the rotation angle of the ruler or the positions in the X direction and the Y direction can be displayed on the display device.

In this case, the detection signal corresponding to the rotation amount or the movement amount is a method in which the magnetic sensor detects a magnetic change due to the movement of the magnetic scale, so that the power consumption is small.
In addition, since the detection of the magnetic change is not affected by dust and dirt, the rotation angle of the ruler and the like can always be displayed with high accuracy.

Embodiment An embodiment of the present invention will be described with reference to FIGS.

In the drafting machine, the perpendicular ruler 1 operates the head 2 and the drawing board 3
The support member 4 of the head 2 can move along the Y-direction guide member 5, and the Y-direction guide member 5 moves along the X-direction guide member 6 orthogonal to the Y-direction guide member 5. Can be moved.

The base of the ruler 1 is connected to a ruler mounting member 1a, and the ruler mounting member 1a is connected to the head 2 via a connecting member 7, so that the head 2 and the ruler 1 are integrally rotated. The support member 4 has a cylindrical holding part 4a for penetrating and holding the head 2, and a magnetic scale 8 is provided on the outer peripheral surface of the cylindrical holding part 4a. Further, a magnetic sensor 9 is disposed to face the magnetic scale 8, and the magnetic sensor 9 is attached to the ruler mounting member 1 a, and the magnetic sensor 9 is rotated by the rotation of the ruler 1. A change is detected. The magnetic scale 8 and the magnetic sensor 9 constitute a magnetic encoder.

The signal detected by the magnetic sensor 9 is transmitted to the display device 10 held by the ruler mounting member 1a, where the signal is processed and the rotation angle is digitally displayed. The display device 10 may be attached to the support member 4 instead of being attached to the ruler attachment member 1a. Further, the mounting portion of the magnetic scale 8 and the magnetic sensor 9 may be in a relationship opposite to that described above.

The configuration in which the support member 4 is held by the Y-direction guide member 5 is as shown in FIG. 3, and a horizontal roller 11 is provided at a base end of the support member 4 and vertical rollers 12 on both sides thereof. Provided. And each roller 11 and 12 perpendicular to each other
Are guided and held by rails 11a and 12a provided on the Y-direction guide member 5.

The structure in which the Y-direction guide member 5 is held by the X-direction guide member 6 is similar to the holding structure of the support member 4 in that the roller is a roller.
It consists of 11, 12 and rails 11a, 12a.

In order to detect the position of the ruler 1 in the Y direction, a magnetic scale 13 is provided on the inner surface of the Y direction guide member 5 along the Y direction, and a magnetic sensor is provided at the tip of the support shaft of the roller 11 facing the magnetic scale 13. 14 is mounted. And the magnetic sensor 14
Is transmitted to the display device 10, where the signal is processed to display the position of the ruler in the Y direction. In order to detect the position of the ruler 1 in the X direction, a magnetic scale 15 is provided on the X direction guide member 6 in the same manner as in displaying the Y direction position, and the Y direction guide member
The magnetic sensor 16 is provided on the support portion of the. Then, the detection signal of the magnetic sensor 16 is transmitted to the display device 10, where the position of the ruler 1 in the X direction is displayed.

Although there were three magnetic encoders in the description of the above configuration, each magnetic scale used was a magnetic film having a thickness of about 80 μm and magnetized at a magnetization pitch of 100 to 300 μm. The magnetoresistive effect element constituting each magnetic sensor is made of a thin film of a ferromagnetic material such as nickel-iron or nickel-cobalt, has a thickness of 400 mm, and has a pattern width of 10 μm. The width of each magnetoresistive element was made smaller than the width within 1/4 of the magnetization pitch of the corresponding magnetic scale. The power consumption of the magnetic encoder thus created was about 1/6 that of the conventional optical encoder, and the resolution was about 20 minutes. In order to improve the resolution of the magnetic encoder, the magnetization pitch of the magnetic scale may be made smaller than that described above, or an electric interpolation method may be used.

[Effect of the Invention] In the drafting machine equipped with the display device for the angle and the like according to the present invention, the rotation amount and the movement amount are detected by the magnetic encoder, and the magnetic sensor is connected to the ferromagnetic thin film by folding and connecting the pattern. Due to the resistance configuration, the power consumption may be small, which is economical for a drafting machine used for a long time. Further, the magnetic encoder can detect dust and dirt without errors, and can accurately display the rotation angle and position of the ruler. Further, the head support member is Y
In order to guide in the direction and the X direction and to hold each member, a configuration is made of rails perpendicular to each other and rollers guided by each rail, so that the position in each direction can be accurately detected.

[Brief description of the drawings]

FIG. 1 is a plan view of a drafting machine provided with a display device for angles and the like according to the present invention, FIG. 2 is a sectional view of the vicinity of a head portion of the drafting machine, and FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... Ruler 2 ... Head 4a ... Cylindrical holding part, 5 ... Y-direction guide member 6 ... X-direction guide member, 8 ... Magnetic scale 9 ... Magnetic sensor, 10 ... Display device 13,15 …… magnetic scale, 14,16 …… magnetic sensor

Claims (2)

(57) [Scope of request for utility model registration] 1. A drawing machine in which a head connected to a ruler mounting plate and rotating integrally therewith is held by penetrating a cylindrical holding portion of a supporting member, wherein the supporting member of the head is orthogonal to the Y direction and the X direction.
A Y-direction guide member and an X-direction guide member for guiding in the directions are provided, and rails arranged perpendicularly to each other and rollers guided by each rail are provided between the support member of the head and the Y-direction guide member. While holding the support member of the head so as to be movable along the Y-direction guide member, a rail vertically arranged between the Y-direction guide member and the X-direction guide member and a roller guided by each rail are provided. Is provided so that the Y-direction guide member can be moved along the X-direction guide member. The X-direction guide member and the Y-direction guide member are provided with magnetic scales in the X direction and the Y direction, respectively. Y
Each of the direction guide members is provided with a magnetic sensor so as to detect a magnetic change of a corresponding magnetic scale,
A drawing machine equipped with a display device for an angle or the like, characterized in that detection signals of two magnetic sensors are transmitted to a position display device in X and Y directions provided at an appropriate position of the drawing machine. 2. A magnetic sensor having a structure in which the resistance is increased by folding and connecting a pattern of a ferromagnetic thin film to one of a surface of a cylindrical holding portion of a support member and a portion of a side of a ruler mounting plate facing the surface. The display device according to claim 1, wherein a magnetic scale is provided on the other side, and a detection signal from the magnetic sensor is transmitted to an angle display device provided at an appropriate position of the drafting machine. Equipped drafting machine.