JPH0135759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dustproof cover device for a numerically controlled automatic drafting machine or a coordinate analyzer.

Conventionally, in a numerically controlled automatic drafting machine with a mechanism that controls the movement of the drawing table in the X coordinate axis direction and controls the movement of the carrier along the Y rail, the movement locus of the table and the carrier is controlled by a seat cover. Equipped with a dustproof cover device for covering. The above dustproof cover device prevents dust from adhering to the screw shaft for feeding the table, and also prevents dust from adhering to the carrier guide rail surface formed along the Y rail or the rack gear for carrier guide. is prevented. In the conventional dustproof cover device, one end of the dustproof sheet is fixed to a movable body such as the table or carrier, the other end of the dustproof sheet is wound around a drum, and the winding end is fixed to the drum. The drum is biased by a coil spring in a direction to wind up the dustproof sheet. Therefore, when the moving body moves linearly in one direction, the drum is pulled by the dustproof sheet, the drum rotates against the elasticity of the coil spring, and the dustproof sheet is paid out from the drum. Furthermore, when the moving body moves in the opposite direction, the drum winds up the dustproof sheet by the elasticity of the coil spring. However, with this method, there is a limit to the length of the dustproof sheet, in other words, the travel distance of the moving object due to the strength of the coil spring in the drum. There was a defect that caused the spring to fatigue.

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 the body of a numerically controlled automatic drafting machine, in which both sides of a table 4 (moving body) are arranged so as to be freely movable in the direction of the X coordinate axis between guide members 2a and 2b. It is movably supported on a guide plate 5 disposed on the fuselage 2. A screw shaft (not shown) is rotatably disposed in the body 2 along the X coordinate axis direction, and the screw shaft is connected to an X motor (not shown). A nut (not shown) is fixed to the lower surface of the table 4, and the nut is screwed onto the screw shaft. Therefore, the X motor is driven,
When the screw shaft rotates, the table 4 moves along the X coordinate axis. 6 has both ends of the fuselage 2
A rack gear (not shown) is fixed to the top surface of the Y coordinate rod. 8 is a carrier (moving body) that is slidably mounted on the Y coordinate rod 6 (guiding member), a Y motor (not shown) is built into this carrier, and a pinion gear is fixed to the output shaft of the Y motor. (not shown) meshes with the rack gear. Therefore, when the Y motor is driven, the carrier 8 moves along the Y coordinate rod 6. Reference numeral 10 denotes a drawing head, which is attached to the carrier 8.

In FIG. 2, reference numeral 12 denotes a rotating body consisting of a drum having approximately the same length as the width in the Y-coordinate axis direction of the table 4, which is rotatably supported by a shaft 14 at one end of the machine body 2, and a dustproof sheet 26 is wrapped around it. The winding end of the dustproof sheet 26 is fixed to the rotating body 12. Reference numeral 18 denotes a support shaft attached to a pair of brackets 20 disposed on both sides of one end of the body 2, into which a roller holder 22 is slidably inserted, and the roller holder 22 is supported by a coil spring. It is biased toward the upper right in FIG. A tension roller 24 having substantially the same length as the rotating body 12 is rotatably supported on the roller holder 22, and a dustproof roller 24, which is wound around the rotating body 12 according to the amount of movement of the table 4, is attached to the tension roller 24. The feeding portion of the sheet 26 is stretched over the dustproof sheet 2.
The other end of 6 is fixed to one end of the table 4. Reference numeral 28 denotes a bracket fixed to one end of the table 4, into which a shaft member 30 is slidably fitted, and the shaft member 30 is biased rightward in FIG. 2 by a coil spring. There is. 32 is aircraft 2
A pulley 34 is rotatably supported by a bracket fixed to the rotary body 12, and a pulley 34 is fixed to one end of the rotating body 12 with the same center of rotation as the pulley 34.
is wound a plurality of times in a direction opposite to the winding direction of the dustproof sheet 26 on the rotating body 12 according to the amount of movement of the table 4, and one end of the wire rope 36 is fixed to a pulley 34. The wire rope 3
6 is stretched over the pulley 32, and
The other end of the wire rope 36 is fixed to the tip of the shaft member 30. The same structure as shown in FIG. 2 is also provided at the other end of the table 4. The dustproof sheet 26 shields and seals the movement trajectory of the table 4 in the upper opening of the machine body 2, thereby preventing dust from entering the machine body 2 through the opening.

Next, another embodiment of the dustproof cover device will be described with reference to FIG.

Reference numerals 40 and 42 denote shafts that are slidably inserted into pipe portions formed in the horizontal direction at both ends of the Y coordinate rod 6, and roller holders 44 and 46 are fixedly installed on these shafts.
The roller holders 44, 46 include rollers 48, 50.
is rotatably supported. The shafts 40, 42
is biased in the protruding direction by a coil spring. Reference numerals 52 and 54 denote brackets protruding from both sides of the fuselage 2, and rotating bodies 56 and 58 made of rollers are rotatably supported on these brackets, respectively.
Pulleys 60, 62 are provided at one ends of the rotating bodies 56, 58.
is permanently installed. Reference numerals 64 and 66 denote shafts that are slidably inserted into pipe portions formed horizontally on both sides of the body 2, and pulley holders 68 and 70 are fixed to the shafts 64 and 66, respectively. Pulleys 72, 74 are rotatably supported by the holders 68, 70. The shafts 64, 66 are urged in the projecting direction by the elastic force of the coil spring. A dustproof sheet 76,
78 is wound a plurality of times, and the dustproof sheets 76, 78
The winding end ends of are fixed to rotating bodies 56 and 58. The other of the dustproof sheets 76 and 78 is connected to the roller 4.
8, 50, and the dustproof sheet 76,
The other ends of 78 are fixed to both sides of the carrier 8. The horizontal portions of the dustproof sheets 76 and 78 are arranged along the movement locus of the carrier 8, so that the horizontal portions of the dustproof sheets 76 and 78 shield the upper surface of the Y coordinate rod 6. The dustproof sheets 76, 78
An appropriate tension is applied to the rollers 48 and 50 by the elastic force acting on the rollers 48 and 50 in the projecting direction. A wire rope 76 is wound around the pulley 60 a plurality of times in a direction opposite to the winding direction of the sheet 76 on the rotating body 56, and one end of the wire rope 76 is fixed to the pulley 60. wire rope 76
The other end of the rope 76 is hung on a pulley 72, and the rope 76 passes through a rope running space formed inside the machine body 2 located below the table 4, and then passes through the pulley 72.
It is multiplied by 6. Further, the other end of the wire rope 76 is wound around the pulley 62 a plurality of times in a direction opposite to the sheet winding direction of the rotating body 58, and the other end of the wire rope 76 is fixed to the pulley 62. The wire rope 76 is given an appropriate tension by the elastic force acting on the pulleys 72 and 74. The number of windings of the wire rope 76 on the pulleys 60, 62 and the number of windings of the dustproof sheets 76, 78 on the rotating bodies 56, 58 are determined by
is appropriately set corresponding to the moving distance along the Y coordinate rod 6. The table 4 is the fourth
In the figure, it moves in a direction perpendicular to the plane of the paper.

Next, the operation of the above embodiment will be explained.

In FIG. 2, when the table 4 moves rightward along the guide plate 5, the pulley 34 is rotated by being pulled by the wire rope 36 due to the movement of the table 4, and the wire rope 36 is let out from the pulley 34. As the pulley 34 rotates, the rotating body 12 rotates in the hour hand rotation, winds up the sheet 26, and prevents the sheet 26 from loosening. When the table 4 moves to the left, the table 4 pulls the sheet 26, which causes the rotary body 12 to rotate in the counterclockwise direction of rotation of the hour hand, and the sheet 26 is fed out from the rotary body 12 by the same amount as the movement of the table 4. It will be done. On the other hand, the wire rope 36 is wound up by the pulley 34 which rotates in conjunction with the rotating body 12, and the wire rope 36
6 is prevented from loosening. The winding diameter of the sheet 26 changes as the rotating body 12 rotates, and as a result, the amount of movement of the table 4 and the winding amount of the sheet 26 do not match exactly. It is absorbed by the change in the left and right direction of the member 30, and prevents the sheet 26 from loosening. The device on the left side of the table 4 in FIG. 2 operates similarly. As is clear from the above description, the shaft member 30 and the pulley 32 are connected to the rope pulley in the reaction direction when the dustproof sheet 26 is fed out and wound up relative to the rotating body 12 as the movable body 4 reciprocates. The rope guide means constitutes a rope guide means for guiding the rope 36 to move relative to the movable body 4, and as shown in FIG. The rope 36 is guided so that it has moving portions 36a in the same direction.

In FIG. 4, when the carrier 8 moves to the right, the sheet 78 is pulled, the rotating body 58 rotates in the direction of rotation of the hour hand, and the sheet 78 is fed onto the Y coordinate rod 6. In conjunction with the rotating body 58, the pulley 62
rotates in the direction of rotation of the hour hand, whereby the wire rope 76 is wound around the pulley 62, and the pulley 60
rotates in the direction of rotation of the hour hand, and the wire rope 76 is let out from the pulley 60. As the pulley 60 rotates in the hour hand rotation direction, the rotating body 56 rotates in the hour hand rotation direction, and the sheet 76 is wound up on the rotating body 56 following the rightward movement of the carrier 8. When the carrier 8 moves to the left, the sheet 76 is pulled by the movement of the carrier 8, and this tensile force causes the rotating body 5 to
6 rotates in the counter-hour hand rotation direction. The rotation of the rotating body 56 causes the pulley 60 to rotate in the same direction, and the wire rope 76 is wound up. As a result, the pulley 62 and the rotating body 58 rotate in the counterclockwise direction of rotation of the hour hand, and the sheet 78 is wound around the rotating body 58 . The winding diameter of the dustproof sheets 76, 78 on the rotating bodies 56, 58 changes depending on the rotation of the rotating bodies 56, 58, and the amount of movement of the carrier 8 due to this change and the winding amount of the dustproof sheets 76, 78 change. The error is 4
8, 50 and pulleys 72, 74 change in and out direction. The above roller 48,
50, elastic mechanism of pulleys 72, 74 and shaft member 3
0. The springing mechanism of the roller 24 constitutes a tension applying means.

As described above, the present invention uses the traction force of the moving body to wind up and unwind the dustproof sheet connected to the moving body, so there is no limit to the travel distance of the moving body, and the degree of freedom in design can be increased. It also has advantages such as excellent durability.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention, in which Fig. 1 is an overall external view, Fig. 2 is an explanatory front view, Fig. 3 is a side view, Fig. 4 is an explanatory side view, and Fig. 5 is an explanatory front view. It is a rear view of the same. 2... Airframe, 2a, 2b... Guide member, 4...
Table (moving body), 6... Y coordinate rod, 8... Carrier (moving body), 10... Drawing head, 12... Rotating body, 16... Dust-proof sheet, 18... Support shaft, 20
... Bracket, 22 ... Coro holder, 24 ...
...Tension roller, 26...Dustproof sheet, 28...
...Bracket, 32...Pulley, 36...Wire rope, 44,46...Colo holder, 48,5
0...Koro, 52, 54...Bracket, 56,
58... Rotating body, 60, 62... Pulley, 68,
70...Pulley holder, 72, 74...Pulley, 76...Wire rope.

Claims (1)

[Scope of Claims] 1. A device for shielding the locus of movement of a movable body 4 capable of reciprocating in a straight line along guide members 2a, 2b with a dustproof sheet 26 interlocking with the movable body 4,
In order to wind up and unwind the dustproof sheet 26 following the movement of the movable body 4, the dustproof sheet 26 is wound around the outer periphery a plurality of times and rotatably disposed on the connected guide members 2a and 2b. the rotating body 12 , a tension applying means for applying appropriate tension to the dustproof sheet 26 , and the rotating body 1
2, and the rope pulley 34 is connected to the outer peripheral part of the rope pulley 34 by being wound several times in a direction opposite to the winding direction of the dustproof sheet 26 on the rotary body 12, and the movable body 4 is connected to the rope pulley 34 for reciprocation. A rope 36 is connected to the movable body 4 so as to be wound around the rope pulley 34 in conjunction with the direction of the rope pulley 34 and let out.
The moving body 4 is attached to the rope 36 as the moving body 4 moves back and forth.
The portion 36b that moves in the opposite direction and the moving body 4
and a rope guide means for guiding the rope 36 so that a portion 36a moving in the same direction as the rope 36 is formed. 2. In a device that shields the locus of movement of a movable body 8 that can reciprocate in a linear direction along a guide member 6 with dustproof sheets 77 and 78 that interlock with the movable body 8, the dustproof sheets follow the movement of the movable body 8. Seats 77, 78
The rotating bodies 56, 58 are rotatably disposed on both ends of the guide member 6, which is connected to the guide member 6 by winding a plurality of dustproof sheets 77, 78 around the outer periphery in order to wind up and unwind the dustproof sheets. 77, 78, rope pulleys 60, 62 connected to the rotating bodies 56, 58, and both ends of the rope pulley 6.
0,62, the rope pulleys 60,62
A dustproof cover device for a drafting machine, etc., comprising a rope 76 that is wound a plurality of times in a direction opposite to the winding direction of the dustproof sheets 77, 78 on the rotary bodies 56, 58 which are interlocked with the rotary bodies 56, 58 and connected.