JP2001317606A - Dust proofing device for moving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive dust proofing device for a moving mecha nism with a long service time for protecting from a ball screw and a nut mem ber dust and metal vapor by covering them, capable of corresponding to a high speed movement. SOLUTION: When the ball screw 11 is rotated and driven by a driving motor 15 to move a moving body 17 where the nut member 21 is mounted, the ball screw 11, the nut member 21, and a part of the moving body 17 where the nut member 21 is mounted are shielded from the outside by a fixing cover 25 and an elastic body cover 27. The part of the moving body 17 where the nut member 21 is mounted is moved with rolling up the elastic body cover 27 with the movement of the moving body 17 provided with the elastic body cover 27. After the moving body 17 is moved, the elastic body cover 27 is pushed by the fixing cover 25 to seal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof device of a moving mechanism for moving a moving body in cooperation with a ball screw which is rotated by a driving motor and a nut member which is screwed to the ball screw and moves. .

[0002]

2. Description of the Related Art As a conventional dustproof device for a moving body, bellows for covering a ball screw are provided on both sides of a moving body which is moved by a ball screw or the like, and ends of the bellows are attached to both ends of the moving body and the ball screw. There is a bellows type that covers the ball screw.

[0003] Also, cover the three sides of the ball screw with a cover,
By covering the remaining one surface with curtains fixed to both ends of the ball screw, a part of the curtain is pulled up by the rolling element, a gap is created between the surfaces, and the rolling element is attached to the moving body and stroked, There is also a curtain type in which a gap is maintained and the moving body and the nut are connected using the gap.

However, the above-mentioned bellows type has the following problems.

(1) Since the bellows does not have rigidity in the direction of expansion and contraction in the expansion and contraction state, it cannot move following high-speed movement and may be damaged by its own inertia.

(2) Since there is a storage portion (refers to a portion where the bellows is in the most contracted state), it is necessary to take a space other than a stroke.

(3) Since the bellows are sewn at the time of manufacturing, labor costs are high and the bellows are expensive.

In the case of the curtain type described above, there are the following problems.

(1) Since the curtain is supported at both ends of the ball screw, it cannot receive its own weight, so it is not suitable for flexure and lateral use near the center.

(2) Especially when the stroke is large,
Due to (1), the curtain must be on the upper side.

(3) Since the curtain is not stable when the curtain is used sideways, a gap is easily formed between the curtain and the cover, and the sealing performance cannot be improved.

(4) When the rigidity of the curtain is increased, a gap is easily formed between the covers, and the sealing performance cannot be improved.

An object of the present invention has been made in view of the above-mentioned problems of the prior art, and is inexpensive and has a long life for covering ball screws and nut members to protect them from dust and metal vapor. An object of the present invention is to provide a dustproof device having a moving mechanism capable of coping with high-speed movement.

[0013]

According to a first aspect of the present invention, there is provided a dustproof device for a moving mechanism, comprising: a ball screw rotatably driven by a drive motor; and a nut screwed onto the ball screw to move. A dustproof device of a moving mechanism for moving a moving body to which a nut member is attached in cooperation with a member, wherein a total length of the ball screw, a nut member, and a part of the moving body attached to the nut member are set inside. A fixed cover provided so as to include, and an elastic member provided to be capable of being opened and closed by pressing one end against the fixed cover so as to close a gap provided for a part of the moving body to pass along with the movement of the moving body. And a body cover.

Therefore, when the drive motor drives the ball screw to rotate and moves the movable body to which the nut member is attached, the ball screw, the nut member and a part of the movable body attached to the nut member are fixed to the fixed cover. And it is shut off from the outside by the elastic body cover. Then, with the movement of the moving body, a part of the moving body attached to the nut member moves while rolling up the elastic body cover along the gap where the elastic body cover is provided. After the moving body has moved, the elastic body cover is again pressed against the fixed cover and hermetically closed.

According to a second aspect of the present invention, in the dustproof device for a moving mechanism according to the first aspect, the fixed cover is provided so as to penetrate the moving body and have both ends fixed. It is characterized by the following.

Accordingly, even if the moving body moves, the fixed cover does not interfere and the ball screw or the like is shut off from the outside to prevent dust.

According to a third aspect of the present invention, there is provided a dustproof device for a moving mechanism according to the first or second aspect, wherein the guide for movably supporting the moving body is also provided with the fixed cover and the elastic body cover. Are included in the inside.

Accordingly, the guide for guiding the movement of the moving body is also shielded from the outside together with the ball screw and the like to prevent dust.

According to a fourth aspect of the present invention, there is provided a dustproof device for a moving mechanism according to the first, second, or third aspect, wherein the elastic cover is a leaf spring. Things.

Therefore, a part of the moving body moves while rolling up the leaf spring as the elastic body cover with the movement of the moving body. After the movement, the leaf spring again applies the ball screw or the like by the elastic restoring force. Cut off and prevent dust.

According to a fifth aspect of the present invention, there is provided a dustproof device for a moving mechanism according to any one of the first to fourth aspects, wherein the inside of the dustproof device is pressurized by the fixed cover and the elastic cover. Air supply means for supplying clean air as much as possible.

Accordingly, the inside of the movable body which is surrounded by the fixed cover and the elastic cover and is closed from the outside including the ball screw and the like is pressurized by clean air, so that a part of the moving body lifts the elastic cover. When moving
Prevents outside air from entering inside and prevents dust.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a dustproof device 3 of a moving mechanism 1 according to the present invention. This dustproof device 3
Is for dustproofing the entire moving mechanism 1.

In the moving mechanism 1, guides 7 are provided over substantially the entire left and right sides (the left and right sides in FIG. 1) of the upper surface of the moving bed 5, and the front and rear ends (the upper and lower ends in FIG. 2) are provided at the center position. The driving screw 11 which is a ball screw is rotatably provided by the bearings 9F and 9B provided in (2). One end (the lower end in FIG. 2) of the drive screw 11 is connected to a drive motor 15 via a coupling 13.

A movable table 17 as a movable body having a rectangular cross section is provided on the guide 7, and is movable along the guide 7 by a slider 19. A nut member 21 screwed to the drive screw 11 is provided on the lower surface of the moving table 17.

Therefore, when the drive motor 15 drives the drive screw 11 to rotate, the nut member 2 screwed to the drive screw 11
Since 1 moves back and forth, the moving table 17 moves back and forth along the guide 7.

End plates 23F and 23B protruding above the moving bed 5 are provided at both front and rear ends of the moving bed 5.
Are provided, and the end plates 23 before and after this are provided.
A fixed cover 25 having a U-shaped cross section that opens downward is attached between F and 23B. In addition, moving bed 5
A leaf spring cover 27 is provided as an elastic body cover over the entire length from the upper end of the left and right side surfaces of the left and right sides. The lower end of the leaf spring cover 27 is fixed to the movable bed 5 and the upper end is formed by the elasticity. Fixed cover 2
5 is pressed against the side surface to seal the internal space 29.

The fixed cover 25 described above penetrates the inside of the movable base 17 so as not to contact the left and right side surfaces of the movable base 17. Rollers 31 are provided at both front and rear end portions on both left and right side surfaces of the moving table 17.
5 and the leaf spring cover 27.

Therefore, in the portion where the moving table 17 is not provided, the upper end of the leaf spring cover 27 is in close contact with the fixed cover 25 due to its elasticity. On the other hand, when the moving table 17 moves, the roller 31 turns the leaf spring cover 27 to the left and right outer sides, but after passing, the leaf spring cover 27 comes into close contact with the fixed cover 25 again.

From the above results, the internal space 29 including the drive screw 11 and the nut member 21 is isolated from the outside by the movable bed 5, the leaf spring cover 27 and the fixed cover 25, and only the movable table 17 is covered by the leaf spring cover 27. Since it is opened from the fixed cover 25, dust from the outside can be shut off, and mixing can be minimized. Accordingly, the life of the guide 7, the drive screw 11, the nut member 21, and the like can be extended, and the reliability of the moving mechanism 1 can be improved.
Further, the cost of the dustproof device 3 can be reduced.

Further, since the leaf spring cover 27 is an elastic member, it has good responsiveness and can minimize the opening to maintain the hermetic seal. Can be.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, when the dust environment of the place where the moving mechanism 1 is installed is particularly bad,
Moving bed 5, leaf spring cover 27 and fixed cover 2
When a pipe 33 is provided as an air supply means in the internal space 29 sealed by the air supply 5 to supply clean air and pressurize the air, air flows outward from an opening around the movable base 17, so that air flows from the outside. This prevents the air from being mixed and further increases the dustproof effect.

Next, another embodiment of the dustproof device 37 of the moving mechanism 35 according to the present invention will be described with reference to FIGS. This dustproof device 37 is for dustproofing the entire length of the ball screw 39 and the nut member 41.

A pair of upper and lower guides 45U and 45L are horizontally provided along the frame 43 on the side surface of the frame 43 of a laser processing machine, for example. A ball screw 39 is horizontally provided between the upper and lower guides 45U and 45L, and is rotatably provided by a bearing (not shown). Although not shown, the ball screw 39
Is driven to rotate by a drive motor.

A driven carriage 49 having a U-shaped cross section is provided so as to be movable in the horizontal direction (the left-right direction in FIG. 4) by means of a falling-off prevention slider 47 movable along the upper and lower guides 45U and 45L. This driven carriage 49
A nut bracket 51 is horizontally provided so as to protrude from a concave portion at the center of the nut bracket 51, and a nut member 41 screwed to the ball screw 39 is attached to the nut bracket 51.

Accordingly, when the ball screw 39 is rotationally driven by a drive motor (not shown), the nut member 41 screwed to the ball screw 39 moves, so that the driven carriage 49 moves along the guides 45U and 45L.

By wrapping the ball screw 39 described above,
The ball screw covers 53A and 53B are attached to the frame 43 over the entire length of the ball screw 39. The ball screw covers 53A and 53B are divided into, for example, two to facilitate attachment and detachment.

An opening 55 is provided in a part (the lower part in FIG. 3) of the ball screw covers 53A and 53B.
The nut bracket 51 passes through the opening 55 to integrally connect the nut member 41 and the driven carriage 49.

The leaf spring cover 57, which is an elastic member, is closed with the ball screw cover 53 closed so that the opening 55 is closed.
A and 53B are provided over the entire length. It should be noted that the nut bracket 51 has a constricted shape in order to narrow a portion where the leaf spring cover 57 is turned up by the nut bracket 51.

A plurality of (here, three, for example) rollers 61A, 61B, 61 are provided in the recess 59 of the driven carriage 49.
C is provided rotatably, the front and rear rollers 61A,
The leaf spring cover 57 is closed by 61C and is brought into close contact with the ball screw covers 53A and 53B, and the leaf spring cover 57 is turned up by the central roller 61B to remove the nut bracket 51.
And the openings are reduced to improve the dustproof effect.

A laser processing head 63 is provided on the front surface (the right side surface in FIG. 3) of the driven carriage 49 so as to be movable up and down. Since the laser processing head 63 is normally used, detailed description is omitted.

From the above results, since the entire circumference of the ball screw 39 is covered with the ball screw covers 53A and 53B and the leaf spring cover 57 so as to allow the movement of the nut member 41, dust from the outside is cut off. Mixing can be minimized. Along with this, it is possible to prevent dust and the like from adhering to the ball screw 39 and the nut member 41, to extend the life, and to improve the reliability of the moving mechanism 35.

Further, since the leaf spring cover 57 is an elastic member, it has good responsiveness and can cope with high-speed movement. In addition, since the nut bracket 51 is formed in a constricted shape, the opening can be kept to a minimum and the hermetic seal can be maintained, and if the stress consideration is satisfied, breakage can be prevented and the device can be used for a long time.

It is to be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, in the above-described embodiment, the case where the laser processing head 63 is mounted on the driven carriage 49 has been described. However, other various types that can be moved and positioned can be mounted.

[0046]

As described above, in the dustproof device for the moving mechanism according to the first aspect of the present invention, when the driving motor drives the ball screw to move the moving body on which the nut member is attached, The nut member and a part of the moving body attached to the nut member are shielded from the outside by the fixed cover and the elastic body cover. As the moving body moves, a part of the moving body attached to the nut member becomes elastic. It moves while rolling up the elastic cover along the gap where the body cover is provided, but after the moving body moves, the elastic cover is pressed again against the fixed cover and sealed, so that dust from the outside is shut off Thus, contamination can be minimized. Along with this, dust and the like can be prevented from adhering to the ball screw and the nut member, the life can be extended, and the reliability of the moving mechanism can be improved.
In addition, since the elastic cover is an elastic member, it has good responsiveness and can cope with high-speed movement.

In the dustproof device of the moving mechanism according to the second aspect of the present invention, even if the moving body moves, the fixed cover does not interfere and the ball screw or the like can be shielded from the outside to prevent dust.

In the dustproof device of the moving mechanism according to the third aspect of the present invention, the guide for guiding the movement of the moving body can be shielded from the outside together with the ball screw and the like to prevent dust.

In the dustproof device of the moving mechanism according to the fourth aspect of the present invention, a part of the moving body moves while lifting up the leaf spring as the elastic body cover with the movement of the moving body. However, due to the elastic restoring force, the ball screw or the like can be in close contact with the fixed cover to block the ball screw and the like from the outside to prevent dust.

In the dustproof device of the moving mechanism according to the fifth aspect of the present invention, since the inside which is surrounded by the fixed cover and the elastic cover and which is closed off from the outside including the ball screw etc. is pressurized by clean air, the moving mechanism is moved. When a part of the body moves up by lifting the elastic body cover, it is possible to prevent external air from entering the inside and to reliably prevent dust.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a dustproof device for a moving mechanism according to the present invention.

FIG. 2 is a plan view seen from a direction II in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the dustproof device of the moving mechanism according to the present invention.

FIG. 4 is a front view as viewed from an IV direction in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dustproof device of moving mechanism 7 Guide 11 Ball screw 15 Drive motor 17 Moving table (moving body) 21 Nut member 25 Fixed cover 27 Leaf spring cover (elastic body cover) 37 Piping (air supply means)

Claims (5)

[Claims] 1. A dustproof device of a moving mechanism for moving a moving body to which a nut member is attached by cooperation of a ball screw rotationally driven by a drive motor and a nut member screwed to the ball screw to move. A fixed cover provided so as to include the entire length of the ball screw, a nut member, and a part of the moving body attached to the nut member, and a part of the moving body passing through as the moving body moves. A dust cover for a moving mechanism, comprising: an elastic body cover that is openable and closable by pressing one end against the fixed cover so as to close a gap provided for the moving mechanism. 2. A dustproof device for a moving mechanism according to claim 1, wherein said fixed cover penetrates said moving body and is provided with both ends fixed. 3. A dustproof device for a moving mechanism according to claim 1, wherein a guide for movably supporting the moving body is also included inside the fixed cover and the elastic body cover. . 4. The elastic body cover is a leaf spring,
The dustproof device for a moving mechanism according to claim 1, 2, or 3. 5. The air conditioner according to claim 1, further comprising an air supply unit configured to supply clean air to pressurize an interior surrounded by the fixed cover and the elastic body cover. The dustproof device of the moving mechanism according to the above.