JPH0434076Y2 - - 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. To enable movement of the pen head mentioned above, there is a head support arm on the side wall of the case on the side where the horizontal scale is attached.
A long hole is formed in the horizontal direction. 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 74 denotes a lifting bar, one end of which is rotatably supported by a bracket 76 fixed to the bottom wall of the case 2, and a tube part 74b (seventh tube) at the other end of the lifting bar 74.
(see figure) is rotatably fitted onto a shaft 80 protruding from the bracket 78. A rotating body 82 is rotatably supported by the shaft 80, and an output shaft of a solenoid 84 fixed to the bottom wall of the case 2 faces an inclined surface 82a formed on the rotating body.
A pair of clamping pieces 82 protruding from the rotating body 82
The other end of the lift bar 74 is fitted between b and 82c, and the lift bar 74 is configured to rotate in conjunction with the rotation of the rotating body 82. The bracket 86 of the solenoid 84 is formed with a rising piece, and a stopper screw 88 is screwed into a threaded portion of a horizontal portion 86a of the rising piece. The lower end of the stopper screw 88 faces the upper surface of the bar 74, and limits the range of upward rotation of the lift bar 74 about the shaft 80. The rotating body 82 is biased by a spring 90 in the direction of lifting the front end tubular portion 74C of the lifting bar 74. The lower surface of the support arm 20 is in contact with the tubular portion 74C of the lifting bar 74 due to its own weight. A pen holding hole 92 is formed at the tip of the support arm 20, into which a pen 94 consisting of a commercially available hollow pen is screwed and held. A controller for driving and controlling the XY motors 52, 24 and the solenoid 84 is installed as an integrated circuit on the board fixed to the case 2, and the operation keyboard (not shown) of the controller is mounted on the board fixed to the case 2. It is placed on the top of the upper wall. When you operate the keyboard,
The XY motors 52 and 24 rotate, and the X cursor 1
0 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.
move along. 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. Further, as the Y cursor 18 moves, the support arm 20 moves in the Y direction. Further, when a drive current is input to the solenoid 84 from the controller, the output shaft of the solenoid 84 protrudes and pushes the inclined surface 82a of the rotating body 82. The rotating body 82 is a solenoid 8
The clamping piece 82 is centered around the shaft 80 by the output shaft of 4.
b and 82c rotate in a direction approaching the table surface. As the rotating body 82 rotates, the elevating bar 74 that is interlocked with the rotating body 82 also rotates around the ruler shaft 80.
The tubular portion 74c is lowered. The tubular portion 74c
As the pen 94 descends, the support arm 20 placed thereon by its own weight swings in the downward direction about the shafts 21 and 23, and the tip of the pen 94 comes into contact with the surface of the drawing paper on the table. When the solenoid 84 is de-energized, the rotating body 82 returns to its original position due to the return elasticity of the spring 90, 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 explained.

In FIG. 2, reference numeral 110 denotes a holder made of rubber, synthetic resin, etc., which is removably fitted into the end of the long hole 22 of the side wall 2a, and a flexible shielding member made of cloth is placed on top of this holder. 112 is fixed to the lower part of the holder 110, and a resilient shielding member 114 made of a thin rubber plate is fixed to the lower part of the holder 110, and the open end sides of the shielding plates 114 and 112 are in contact with each other,
This blocks the long hole 22. The vertical width of the opening of the holder 110 is set to be slightly wider than the vertical movement width of the pen support arm 20.

In the above configuration, the shielding members 112, 11
When the pen support arm 20 moves up and down between
The support arm 20 is deformed as the support arm 20 moves up and down, and the elongated hole 22 is kept in a shielded state. Shielding member 1
12 returns to its original shape due to its own weight when the pressure from the pen support arm 20 is released, and the shielding member 114 returns to its original shape due to its elasticity. Incidentally, the shielding member 112 may be formed of a rubber plate.

Next, another embodiment will be described with reference to FIGS. 4 and 5.

Reference numeral 122 denotes a holder which is removably fitted to the upper forming end 2a' of the long hole forming ends 2a' and 2b of the side wall 2a, and a flexible shielding member 124 made of cloth is fixed to this holder. 126 is a shielding member, the frame portion 126a of which is fitted into the side wall 2a around the elongated hole forming end 2b so as to be slidable in the vertical direction;
It is urged upward by a spring 128. The shielding member 126 has elasticity due to the spring 128. The shielding members 124, 126
shields the entire elongated hole 22, and the frame portion 126
A pen support arm 20 is inserted between the upper surface of the shielding member 124 and the lower end of the shielding member 124. 130 is a solenoid fixed to the bottom wall 2C of the case 2, and its output shaft 132 faces the rising portion 134a of the lift bar 134. Both longitudinal ends of the lift bar 134 are rotatably supported by a shaft 136 via a bracket on the bottom wall 2C of the case 2, and the lower surface of the horizontal portion 134b of the lift bar 134 is connected to the horizontal portion 126b of the shielding member 126. It is in contact with the top surface.

In the above configuration, when the solenoid 130 is energized and its output end 132 protrudes, the lift bar 134 swings in the counterclockwise direction about the shaft 136 in FIG. 4 and pushes down the shielding member 126. As the shielding member 126 descends, the pen support arm 20 descends under its own weight, and the pen at its tip abuts against the drawing paper on the table. Solenoid 13
When the energization to 0 is removed, the shielding member 126 rises due to the elasticity of the spring 128, and the pen support arm 20 also rises.

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 uses a flexible shielding member and an elastic shielding member to shield the opening in the side wall of the case, making it possible to prevent dust from entering the case. There is an effect that can achieve the purpose of.

[Brief explanation of the drawing]

The drawings 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 parts, and Fig. 4 is a plan view of the case with the top wall removed. FIG. 5 is a plan view, and FIG. 6 is an exploded perspective view. 2...Case, 4...Horizontal scale, 2a...Side wall, 20...Pen support arm, 22...Long hole, 1
DESCRIPTION OF SYMBOLS 10... Holder, 112, 114... Shielding member, 122... Holder, 124, 126... Shielding member, 128... Spring, 130... Solenoid, 132... Output shaft, 134... Lifting bar.

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 that holds a pen 94 at its tip protrudes outward from the long hole 22. Said long hole 22
Automatic drawing in which the movement of the pen 94 is controlled in the X direction along the longitudinal direction of the support arm 20 and the Y direction along the longitudinal direction of the support arm 20, and the movement of the pen 94 is controlled in the Z direction perpendicular to the bottom wall of the case 2. In the container, flexible sheet-like shielding members 112 and 124 are attached to the side wall 2a at positions that shield the upper half of the long hole 22, and elastic sheet-like shielding members 112 and 124 are attached to the positions that shield the lower half of the long hole 22. Shielding members 114, 126 having
is attached to the side wall 2a, and the pen support arm 20 is inserted into opposing parts of the pair of shielding members.