JPH025997Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dustproof device for an automatic drawing device, which is housed in a small case and can be used by attaching the case to a scale mounting plate of a universal parallel ruler.

In this type of automatic drawing device, a horizontal scale for drawing is attached to the case, and in front of the horizontal scale, a pen head protruding from the case is arranged vertically and horizontally parallel to the table surface and perpendicular to the table surface. Movement is controlled in the vertical direction. In order to enable movement of the pen head, a horizontally long elongated hole for the head support arm is formed in the side wall of the case on the side where the horizontal scale is attached. This long hole is set to have a considerably wide width in the direction perpendicular to the table surface in order to allow the head support arm to move in the vertical direction. Particularly when the table is used in an upright position, the horizontal scale is positioned upward, so the guide hole opens upward. Therefore, eraser scraps, dirt, dust, etc. that fall from the table surface easily enter the case through the elongated hole. If a large amount of dust enters the case, the dust will enter the inside of the motor housed in the case and cause the motor to malfunction. Furthermore, in the case of an automatic drawing device that converts the rotation of the pulley into the above-mentioned vertical and horizontal movement of the pen support arm via a rope-like member, if dust adheres to the surface of the pulley inside the case, the diameter of the pulley may change. , which causes pen movement errors.

The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a case of the automatic drawing device, and a horizontal scale 4 and a mounting bracket 5 for removably connecting the case 2 to the scale mounting plate of the universal parallel ruler are fixed to the upper edge of the bottom wall of the case. There is. Reference numerals 6 and 8 denote X-axis guides fixed to the bottom of the case 2 via brackets, to which X cursors 10 and 12 are attached.
The inner diameter part is slidably inserted. The X cursors 10 and 12 have Y guide shafts 14 and 16.
are constructed integrally. A Y cursor 18 is slidably inserted into the Y guide shafts 14 and 16, and a pair of rising portions 20a and 20 fixed to one end of the support arm 20 are provided on both sides of the Y cursor.
b is rotatably supported by shafts 21 and 23. The support arm 20 is disposed below the X guide shaft 6, and the arm 20 is connected to the side wall 2 of the upper edge of the case.
It protrudes forward from the upper edge of the case 2 through the horizontally elongated hole 22 of a. Reference numeral 24 denotes a Y motor fixed to the bottom wall of the case 2, and a small gear 26 is fixed to the output shaft of the Y motor. It meshes with a gear 30 at one end of 28. A drum 32 is fixed to the other end of the shaft 28, and a flexible wire rope 34 is wound around the drum 32 a plurality of times. One of the ropes 34 is connected to the rope pulley 3
6, 38, 40 and 42 with appropriate tension, and one end of the rope 34 is attached to the case 2.
is fixed to one side of the bottom wall. Said rope 3
The other end of the rope 34 is hung on rope pulleys 44, 46, 48 and 50 with appropriate tension, and the other end of the rope 34 is fixed to one side of the bottom wall of the case 2. The pulleys 36 and 44 are rotatably supported on the bottom wall of the case 2. The pulleys 38 and 42 are rotatably supported by the X cursor 10, and the pulleys 46 and 50 are rotatably supported by the X cursor 10.
2 is rotatably supported. The pulley 4
0 and 48 are rotatably supported by the Y cursor 18. Reference numeral 52 denotes an X motor fixed to the bottom wall of the case 2, and a small gear 54 is fixed to the output shaft of this motor, and the small gear 54 is rotatably supported on the bottom wall of the case 2 via a bracket. It meshes with an intermediate gear 56 fixed to one of the shafts, and a small gear 58 is fixed to the other shaft. A shaft 60 is rotatably supported on the bottom wall of the case 2 via a bracket, and drums 62 and 64 are fixed to both ends of the shaft. A gear 66 fixed to the shaft 60 meshes with the small gear 58. One end of the wire rope 66 wound multiple times around the drum 62 is fixed to one side of the X cursor 10, and the other end of the wire rope 66 is rotated to the bottom wall of the case 2 with an appropriate tension. It is hung on a freely supported rope pulley 68,
The other end of the rope 66 is fixed to the other side of the X cursor 10. One end of a wire rope 70 wound multiple times around the drum 64 is fixed to one side of the X cursor 12, and the other end of the rope 70 has an appropriate tension and is rotatable on the bottom wall of the case 2. The other end of the rope 70 is hung on a rope pulley 72 supported by the X cursor 1.
It is fixed to the other side of 2. Reference numeral 118 denotes a lift bar, which is driven by a solenoid 126 to control the pen support arm 20 up and down, as will be described later. the support arm 20
A pen holding hole 92 is formed at the tip of the pen, into which a pen 94 consisting of a commercially available hollow pen is screwed and held. The board fixed to the case 2 includes the
A controller for driving and controlling the XY motors 52, 24 and the solenoid 84 is installed as an integrated circuit, and an operation keyboard (not shown) for the controller is provided on the upper surface of the upper wall of the case 2. When you operate the keyboard, the XY motor 5
2 and 24 rotate, the X cursors 10 and 12 move along the X guide axes 6 and 8, and the Y cursor 18 moves along the Y guide axes 14 and 16. As the X cursors 10 and 12 move, the support arm 20 moves in the left-right direction, that is, in the X direction in FIG. Furthermore, the movement of the Y cursor 18 causes the support arm 20 to move in the Y direction. Further, when a drive current is input from the controller to the solenoid 126, the output shaft of the solenoid 126 protrudes, and the support arm 20 swings in the downward direction about the shafts 21 and 23, so that the tip of the pen 94 is placed on the table. It touches the surface of the drawing paper. The above solenoid 126
When the energization is removed, the return elasticity of the spring 90 causes the lift bar 118 to pivot back to its original position, and the pen 94 rises from the surface of the paper on the table. A predetermined pattern is automatically drawn on the drawing paper on the table according to the program by the lifting and lowering operations of the support arm and the moving operations in the XY directions.

Next, a dustproof device installed in the elongated hole 22 of the side wall 2a at the upper edge of the case 2 will be described.

In FIGS. 2 to 4, reference numerals 110 and 112 are belt pulleys rotatably supported by the bottom wall 2C of the case 2, and a belt 114 is stretched around these pulleys with an appropriate tension. The belt 114
One of the two is disposed at a position that blocks the elongated hole 22. Both ends of the belt 114 are provided with guide plates 116.
A pen support arm 20 is fixedly connected to the guide plate 116 and inserted into a guide hole 116a formed transparently in the guide plate 116 so as to be movable up and down. A bent portion is formed on the arm 20 so as not to collide with the other side of the belt 114. Reference numeral 118 denotes a long elevating bar, and both ends of this in the longitudinal direction are connected to the bracket 12.
0 and 122, a shaft 124 is rotatably supported on the bottom wall 2C of the case 2. The lifting bar 1
18 has a V-shaped cross section, and the pen support arm 20 abuts with its own weight on the end face of one side of the pen support arm 18. 126 is a solenoid fixed to the bottom wall 2C, and its output shaft 128 faces the other side surface of the lift bar 118. The lift bar 118 is biased by a spring in the direction of the hour hand about a shaft 124 in FIG.

In the above configuration, when the pen support arm 20 moves along the elongated hole 22, the belt 114 is moved between the pulley 110 and
112, and the shielding state of the elongated hole 22 by the belt 114 is maintained. To lower the pen, the solenoid 126 is energized, and to raise the pen, the solenoid 126 is de-energized. When the solenoid 126 is energized, the output shaft 128 protrudes, thereby causing the lift bar 118 to move toward the shaft 124.
The pen support arm 20 swings in the counterclockwise direction in FIG. 2 with the pen support arm 20 at its center. Solenoid 126
When the power is removed, the lifting bar 118 is rotated by the spring force in the direction of the hour hand in FIG. 2, and the pen support arm 20 is raised. In addition, the above-mentioned information board 116
The guide hole 116a may be shielded by a brush, a flexible material, an elastic member, or the like to allow the pen support arm 20 to move up and down. However, the opening area of the guide hole 116a is smaller than that of the elongated hole 22.
It is extremely small compared to the opening area of the opening, and the amount of dust entering from this opening can be almost ignored. still,
The above embodiment can also be applied to an automatic drawing device in which the pen support arm 20 does not move in the Z direction, that is, in the vertical direction.

As described above, the present invention has the effect that the opening in the side wall of the case is shielded by the belt, so that the intrusion of dust into the case can be reduced, and the object stated at the beginning can be achieved.

[Brief explanation of drawings]

The figures show a preferred embodiment of the present invention, in which Fig. 1 is a plan view with the top wall of the case removed, Fig. 2 is a sectional view, Fig. 3 is a front view of the main parts, and Fig. 4. is a plan view of the main part. 2...Case, 4...Horizontal scale, 2a...Side wall, 20...Pen support arm, 22...Long hole, 1
10, 112... Belt pulley, 114... Belt, 116... Guide plate, 116a... Guide hole,
118... Lifting bar, 120, 122... Bracket, 124... Shaft, 126... Solenoid, 1
28...Output shaft.

Claims (1)

[Scope of utility model registration request] A long hole 22 is formed in the front side wall 2a of the case 2 along its longitudinal direction, and a pen support arm 20 for holding a pen is projected to the outside from the long hole 22. Automatic drawing in which movement is controlled in the X direction along the support arm 20 and in the Y direction along the longitudinal direction of the support arm 20, and movement of the pen is controlled in the Z direction perpendicular to the bottom wall of the case 2. In the case 2,
Belt pulleys 110 and 112 are rotatably supported at both ends of the elongated hole 22 in the longitudinal direction, and a belt 114 is placed between the belt pulleys 110 and 112, and one of the belts 114 is connected to the elongated hole 22.
The pen support arm 2 is placed in a guide hole 116a provided in the belt 114 so as to be hung over the belt 114 so as to cover the pen support arm 2.
A dustproof device characterized by having a 0 inserted therein.