JPH042078Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a writing device that draws figures or characters by selectively moving a writing instrument in two coordinate axes directions, and particularly relates to a writing device that supports the writing instrument. The present invention relates to an improvement in a guide rail mechanism that guides the movement of a writing instrument support arm.

<Background Art and its Problems> Conventionally, while a writing instrument support arm is moved in two coordinate axes directions by a guide rail mechanism provided on a base, figures, characters, etc. are drawn by the writing instrument supported by the arm. A writing device designed to draw is known.

The guide rail mechanism has first and second guide rails mounted on the base in parallel with a predetermined distance apart in one coordinate axis direction (hereinafter referred to as the X-axis direction), and the other coordinate axis direction (hereinafter referred to as the X-axis direction). It has third and fourth guide rails attached at a predetermined distance apart in the Y-axis direction (hereinafter referred to as the Y-axis direction). First, second, third, and fourth sliders are slidably inserted into each of the guide rails, and a fifth guide rail moves in the Y-axis direction between the first and second sliders. A sixth guide rail is installed between the third and fourth sliders so as to be movable in the X-axis direction. At the intersection of the fifth guide rail and the sixth guide rail, there is a fifth guide rail.
The fifth slider is assembled so as to be selectively slidable in the X-axis direction or the Y-axis direction, and a writing instrument support arm for supporting a writing instrument is attached to the fifth slider. And the fifth above
Each end of the and sixth guide rail is integrally connected to the first, second, third and fourth sliders, respectively.

By the way, in the structure in which each end of the fifth and sixth guide rails is integrally connected to each of the sliders as described above, smooth movement of the fifth slider, that is, the writing instrument support arm is obtained. In order to achieve this, high assembly parallelism is required for the first and second guide rails and the third and fourth guide rails. Therefore, each of the first, second, third, and fourth guide rails is required to have high component precision so that warping or the like does not occur in the guide rails. Furthermore, even if each of the guide rails described above is free from warping and has high precision parts, the assembly parallelism when installing each of these guide rails on the base is required to be high.
The work of assembling the guide rails has become complicated.

Further, the above-mentioned guide rail mechanism requires six guide rails and five sliders, resulting in a large number of parts, a complicated structure, and high cost.

<Purpose of the invention> Therefore, the present invention was proposed in view of the conventional situation, and even if the accuracy of the parts of the guide rail is low and the assembly parallelism of the guide rail is low, The purpose is to absorb variations in accuracy and always ensure smooth movement of the writing instrument support arm in the two coordinate axes directions.

Further, the present invention aims to simplify the structure and reduce costs by reducing the number of parts.

<Summary of the invention> In order to achieve each of the above objects, the invention includes first and second guide rails that are mounted on a base in parallel with a predetermined distance apart in one coordinate axis direction;
First and second sliders are fitted into each of these guide rails so as to be slidable in the direction of the other coordinate axis, and a third slider is installed between each of these sliders so as to be movable in the direction of the other coordinate axis. and a writing instrument support arm fitted into these guide rails so as to be rotatable and slidable in the direction of one of the coordinate axes, and each end of the third guide rail is connected to the first and second guide rails, respectively. It is characterized in that it is fitted into a guide hole formed in the second slider so as to be rotatable and slidable in one coordinate axis direction.

<Example> Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a partially cutaway plan view showing the internal structure of the writing device. This writing device is used alone or attached to a general rail-type drawing machine, and is used to draw figures such as circles, squares, numbers, letters, etc. using a writing instrument such as an ink pen attached to the tip of a writing instrument support arm 1. It depicts.

This writing device consists of a base 2 consisting of a rectangular flat plate.
have. On this base 2, first and second guide rails 3 and 4, which are made of round bars and are parallel to the X-axis direction (left-right direction in FIG. 1), are arranged at a predetermined distance apart. Each end of the first guide rail 3 has first and second guide rails fixed to the base 2 with screws.
It is supported by bearing blocks 5 and 6 such that it can rotate freely and not move in the Y-axis direction (vertical direction in FIG. 1). In addition, each end of the second guide rail 4 is rotatably supported in the Y-axis direction by third and fourth bearing blocks 7 and 8 fixed to the base 2 with screws, similarly to the first guide rail 3. It is supported by a pivot to prevent it from moving.

First and second sliders 9 and 10 are fitted into the first and second guide rails 3 and 4 so as to be slidable in the Y-axis direction. In addition, each of the sliders 9 and 10 is connected to each of the guide rails 3,
4, each can be rotated freely.

A third guide rail 11 made of a round bar is installed between each of the sliders 9 and 10 so as to be movable in the Y-axis direction. A third slider 12 is fitted into the third guide rail 11 so as to be rotatable and slidable in the X-axis direction.

Then, on the third slider 12, a second
As shown in the figure, the base end of a writing instrument support arm 1 made of a long flat plate is fixed with a screw. The tip of the arm 1 protrudes from the base 2 so as to face the writing surface, and a mounting hole 1A for mounting a writing instrument is formed at the tip.

Therefore, the writing instrument support arm 1 moves in the Y-axis direction by the movement of the first and second sliders 9 and 10 in the Y-axis direction, and also moves in the X-axis direction by movement of the third slider 12 in the X-axis direction. It is movable in the axial direction.

The first and second sliders 9 and 10 for moving the writing instrument support arm 1 in the Y-axis direction are driven by a Y-axis direction movement motor 13, which is mounted and fixed on the base 2 and is, for example, a stepping motor. . A first timing pulley 14 is assembled and fixed to the rotating shaft of the motor 13. The pulley 14 is connected to the first and third bearing blocks 5,
A closed-loop timing pulley 16 is attached to a second timing pulley 16 that is assembled and fixed to one end of an elongated rotating shaft 15, which is rotatably supported at each end by a second timing pulley 16 that protrudes outward from the first bearing block 5. They are connected via one timing belt 17. The second timing pulley 16 is formed to have a larger outer diameter than the first timing pulley 14, and has a function of reducing the rotational speed of the motor 13.

Further, a third timing pulley 18 is integrally assembled and fixed to one end of the rotating shaft 15. Further, a fourth timing pulley 19 is integrally assembled and fixed to the other end of the rotating shaft 15 that projects outside from the third bearing block 7.

The third timing pulley 18 is connected to a fifth timing pulley 20 rotatably supported by the second bearing block 6 by a closed-loop second timing belt 21. Further, the fourth timing pulley 19 is connected in a closed loop to a sixth timing pulley 22 rotatably supported by the fourth bearing block 8 by a third timing belt 23.

The first slider 9 is fixed onto the second timing belt 21 with a screw or the like, and the third timing belt 2
The second slider 10 is fixed on the slider 3 with screws or the like similarly to the first slider 9.

Therefore, the rotation of the Y-axis direction movement motor 13 causes the rotation shaft 15 to rotate, and the second and third timing belts 21 and 23 run in the Y-axis direction, thereby causing the first and third timing belts 21 and 23 to travel in the Y-axis direction. The second sliders 9 and 10 are moved in the Y-axis direction, thereby allowing the writing instrument support arm 1 to be moved in the Y-axis direction.

Further, the third slider 12 for moving the writing instrument support arm 1 in the X-axis direction is an It is driven by an axial movement motor 24. A seventh timing pulley 2 is attached to the rotating shaft of the motor 24.
5 is assembled and fixed. The seventh timing pulley 25 is an eighth timing pulley 26 that is assembled and fixed to one end of the first guide rail 3 that projects outward from the second bearing block 6.
The fourth timing belt 27 is connected to the fourth timing belt 27 in the form of a closed loop. The eighth timing pulley 26 has a larger outer diameter than the seventh timing pulley 25, and has a function of reducing the rotational speed of the motor 24.

On the other hand, an opening 28 is formed in the center of the first slider 9 and passes through the base 2 in the vertical direction, and a ninth timing pulley 29 is inserted into the opening 28 and is connected to the first guide rail. 3 and is fitted so that it can rotate freely and slide freely in the Y-axis direction. Furthermore, an opening 30 is formed in the center of the second slider 10 as well as the first slider 9, and a tenth timing pulley 31 is disposed within this opening 30.
is fitted so that it can rotate freely together with the second guide rail 4 and can slide freely in the Y-axis direction. The ninth and tenth timing pulleys 29 and 31 are connected to the fifth timing pulley in a closed loop.
are connected by a timing belt 32. As shown in FIG. 3, a recessed groove 33 into which the fifth timing belt 32 is inserted is formed on the upper surface of the third slider 12, and the fifth timing belt is inserted into the recessed groove 33. 32 is fixed to the third slider 12 with screws or the like. Note that a guide groove portion 34 for guiding the running of the fifth timing belt 32 is formed on the lower surface of the third slider 12.

Therefore, the first guide rail 3 rotates due to the rotation of the X-axis direction movement motor 24,
As the fifth timing belt 32 travels in the X-axis direction, the third slider 12 moves in the X-axis direction, thereby allowing the writing instrument support arm 1 to move in the X-axis direction.

The above-mentioned motors 13 and 24 are driven in forward or reverse rotation according to signals from the motor control circuit, and the writing instrument support arm 1 can be rotated in any direction along the Y-axis (upward or downward in FIG. 1) and along the X-axis. It is designed to be able to move in any direction (leftward or rightward in FIG. 1).

Furthermore, a writing instrument support arm 1 is mounted on the base 2.
A solenoid 35 is mounted and fixed thereon for rotating the writing instrument around the third guide rail 11 and driving the writing instrument up and down with respect to the writing surface. At the tip of the plunger 36 of the solenoid 35, a fourth
As shown in the figure, one end of the flat drive link 31 is pivotally supported by a pin 37. At the midway point in the longitudinal direction of the link 37, two
Elongated holes 39, 39 are bored in parallel, and screws 40, 40 screwed onto the side surface of the first bearing block 5 are inserted into each of these elongated holes 39, 39, respectively. The link 37 is movable in the X-axis direction within the width of the elongated hole 40 in the longitudinal direction. A tension spring 41 for returning the link 37 to the right in FIG. 1 is disposed between the other end of the link 37 and the base 2.

A drive pin 42 is provided at a position near the other end of the link 37 to protrude inward (downward in FIG. 1). Note that the pin 42 is set to be located between the base 2 and the rotating shaft 15. The drive pin 42 is connected to a cam hole 4 formed in a front plate portion 44 of a long writing instrument lifting link 43 having an L-shaped longitudinal section and supported by the rotating shaft 15.
5 is inserted and engaged.

Each end of the link 43 for lifting and lowering the writing instrument is bent inward (downward in FIG. It is inserted into 15. and,
The link 37 is rotatably supported around the rotating shaft 15.

Cam hole 45 bored in the link 37
is formed in a triangular shape, and when the writing instrument is in the raised position where it floats above the writing surface, the first cam hole 45 is formed in a triangular shape.
The drive pin 42 is engaged with the corner 45a of the link 43, and the front plate 44 of the link 43 is supported in an upright manner with respect to the base 2.
The writing instrument support arm 1 is connected to the link 4.
It is received by the upper edge 44A of the front plate part 44 of No. 3,
It is supported in the raised position.

When the solenoid 35 is energized by a signal from the solenoid control circuit, the plunger 36 is retracted in the direction of arrow A in FIG. 1, and the drive link 37 is moved in the same direction as the plunger 36. It moves along the cam surface 45A of the cam hole 45 to the second corner 45b. When the drive pin 42 moves along the cam surface 45A of the cam hole 45, the writing instrument lifting link 4
3 rotates in the direction of arrow B in FIG.
The front plate part 44 of No. 3 is inclined as shown by the broken line in FIG. 3, and while receiving the writing instrument support arm 1, the arm 1 is rotated in the clockwise direction in FIG. 3 about the third guide rail 11. Move the writing instrument down relative to the writing surface. The coil part of the writing instrument lifting link 43 is rotatably inserted into the rotating shaft 15, and one end is locked to the base 2, and the other end is locked to the front plate part 44, so that the link 43 can be used for returning the link. The torsion coil spring 46 allows the front plate portion 44 to automatically return to its original position standing up with respect to the base 2.

When the solenoid 35 is de-energized and the drive link 37 returns to its original position as shown in FIG.
The drive pin 42 moves away from the second corner 45b of the cam hole 45. At this time, the writing instrument lifting link 4
3 is automatically returned to the original position shown in FIG. 1 by the torsion coil spring 46, and the writing instrument support arm 1 is rotated counterclockwise in FIG. 3, so that the writing instrument floats above the writing surface. ing.

By the way, the first and second sliders 9, 1
As shown in FIG. 5, each end portion 11a, 11b of the third guide rail 11 installed between
It is fitted into guide holes 47, 47 which are formed through it so as to be rotatable and slidable in the X-axis direction.

Therefore, even if the first and second guide rails 3 and 4 are warped, the first and second sliders 9 and 4 are not hindered by the presence of the third guide rail 11. 10 can be smoothly slid in the Y-axis direction along the first and second guide rails 3 and 4 while being moved in the X-axis direction according to the warpage. Therefore, smooth movement of the writing instrument support arm 1 in the Y-axis direction can be ensured.

Furthermore, even if the assembly parallelism of the first and second guide rails 3 and 4 is low, the first and second sliders 9 and 1
0 to the first and second guide rails 3, without being hindered by the presence of the third guide rail 11.
4 in the Y-axis direction, smooth movement of the writing instrument support arm 1 in the Y-axis direction can be ensured.

Note that since the writing instrument support arm 1 is guided to move in the X-axis direction by only one guide rail, that is, the third guide rail 11, the arm 1 is always moved smoothly in the X-axis direction. Movement can be guaranteed.

In addition, the movement guide of the arm 1 in the X-axis direction and the Y-axis direction is provided by three guide rails (first and second
and third guide rails 3, 4, 11) and three sliders (first, second and third sliders 9,
10, 12), so
Compared to the conventional one with six guide rails and five sliders, the number of parts can be reduced, the structure can be simplified, and costs can be reduced.

Note that retaining rings 48, 48 are attached to the outer periphery of each end of the third guide rail 11 to prevent the rail 11 from sliding more than necessary.

<Effects of the invention> As described above, according to the invention, even if the first and second guide rails are warped and the accuracy of the parts of these rails is low, it is still possible to assemble each guide rail to the base. Even if the mounting parallelism is low, variations in each accuracy can be absorbed by rotating and/or sliding the third guide rail. Therefore, smooth movement of the writing instrument support arm in the directions of the two coordinate axes is always ensured without being affected by the warpage of the first and second guide rails or the parallelism of assembly of each guide rail. It is possible to ensure high precision writing.

In addition, the present invention can move the writing instrument support arm in the direction of the coordinate axes using three guide rails and three sliders, so it is possible to move the writing instrument support arm in the direction of the coordinate axis using three guide rails and three sliders.
To reduce the number of parts and simplify the structure compared to a system in which the movement of a writing instrument support arm in two coordinate axis directions is guided by a book guide rail and five slides. It is possible to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing one embodiment of the present invention, Fig. 2 is a partially omitted front view, Fig. 3 is a longitudinal sectional side view of the main part, Fig. 4 is a partially cutaway rear view, and Fig. 5 is a partially cutaway plan view. The figure is an enlarged sectional view of the main part. 1... Writing instrument support arm, 2... Base, 3...
...First guide rail, 4...Second guide rail, 9...First slider, 10...Second slider, 11...Third guide rail, 11a, 1
1b... end, 12... third slider, 47,
47... Guide hole.

Claims (1)

[Scope of utility model registration request] First and second guide rails are mounted parallel to each other at a predetermined distance in the direction of one coordinate axis on the base, and a first guide rail is fitted into each of these guide rails so as to be slidable in the direction of the other coordinate axis. and a second slider, a third guide rail installed between each of these sliders so as to be movable in the direction of the other coordinate axis, and a third guide rail so as to be freely rotatable and slidable in the direction of the one coordinate axis on the guide rail. each end of the third guide rail is rotatable in the guide hole formed in the first and second slider and slidable in the direction of one of the coordinate axes. A writing device characterized by being inserted into the body.