JPH0620898Y2 - Feeder with dust cover - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a feeder with a dust-proof cover in which a dust-proof cover is provided on a feeder that integrally combines a ball screw device and a linear guide device.

[Conventional technology]

As a conventional feeder with a dustproof cover, there is one as shown in FIG. 13, for example.

In this device, two sliders 2 are mounted on a long guide rail 1 having axial ball rolling grooves 1a on both sides. A ball rolling groove (not shown) facing the ball rolling groove 1a of the guide rail 1 is formed on the inner surface of the slider 2, and a large number of balls are rotatably fitted in the ball rolling grooves facing each other. Have been combined. A circulation path for the ball is further formed inside the slider 2, and when the slider 2 moves along the guide rail 1, the ball circulates and rolls in the ball circulation path. Two sliders 2
A moving body 2A is fixed on the upper part of the above, and a ball screw shaft 3 as a feed screw arranged in parallel with the guide rail 1 is screwed into the moving body 2A. The slider 2 is driven in the above-mentioned direction of the guide rail by being rotated by the drive device. Thus, this slider 2
The driven body mounted on the upper surface of can be fed in a predetermined direction and positioned precisely.

As a result, if dust enters from the outside and adheres to the ball screw or the ball rolling groove, the smooth movement of the screw or the ball may be hindered, and the feeding operation and the positioning accuracy may be adversely affected.
When used in an environment where a high degree of cleanliness is required, on the contrary, it is necessary to strictly prevent the lubricant from being scattered from the inside of the device to pollute the environment.

Therefore, the space above the guide rail 1 and the ball screw shaft 3 which is normally open due to the movement of the slider 2 is closed by the dustproof cover 5. The illustrated dustproof cover 5 is in the shape of a belt, and two winding devices 6 that utilize spring force are arranged on both ends of the guide rail 1, respectively.
One end of the belt-shaped dust-proof cover 5 pulled out from is fixed to the end of the slider 2. When the slider 2 moves to the left in the figure, for example, the right belt-shaped dust cover 5 is pulled out from the right winding device 6 and the left belt-shaped dust cover is attached to the left winding device 6. 5 is wound up.

[Problems to be solved by the device]

However, in the above-mentioned conventional example, since the belt-shaped dustproof cover 5 is wound by the spring force of the belt winding device 6, the following various problems occur. If the spring force is too strong, the operation of the slider 2 becomes heavy. Further, if the spring force is too weak or if it deteriorates over a long period of time, the belt-shaped dustproof cover 5 is loosened and the dustproof effect is extremely reduced. The dust adhering to the surface of the belt-shaped dustproof cover 5 is rolled up and transferred to the back surface, and enters the apparatus when the belt-shaped dustproof cover 5 is pulled out. Since the spring force of the winding device cannot be increased so much, the long belt-shaped dustproof cover 5 cannot be wound up. Therefore, it is not suitable for a device with a long stroke.

Others use bellows-type or telescope-type dust-proof covers, but in that case, the space for retracting the bellows-type or telescope-type slider cylinder is large, so the device tends to be large, and the length is also long. Not suitable for stroke devices.

Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems, and an object thereof is to provide a stable dustproof action for a long period without change in strength and weakness such as spring force and deterioration with time. It is an object of the present invention to provide a feeder with a dustproof cover that can be guaranteed and can be easily applied to long strokes, and that has a dustproof cover that prevents dust from turning around on the back surface.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a guide rail having a concave cross-section and an axial ball rolling groove on the inner surface, and a ball rolling groove corresponding to the ball rolling groove of the guide rail on the outer surface. , And an end cap having a semi-doughnut-shaped curved path that connects the ball rolling groove and the ball return hole to each other while having a through hole that is a ball return hole parallel to this and inside the wall thickness. And a screw hole into which the feed screw shaft is screwed is provided in the shaft center portion, the slider moves along the guide rail, the ball rolling groove of the guide rail, and the ball rolling of the slider facing the ball rolling groove. A large number of balls that are rotatably fitted in the moving groove and circulate through the curved path and the ball return hole, and a driven body mounting projection of the slider that is projected outside from the upper opening of the guide rail. Axes that allow axial movement A unit cover having parallel elongated holes extending in the same direction to cover the opening of the guide rail, and a dustproof belt fixed to the slider so as to block the elongated hole of the unit cover and move along with the movement of the slider. , A pair of pulleys rotatably supported at both ends of the guide rail to guide the dustproof belt.

A belt retainer can be attached to the unit cover so as to press the dustproof belt against the unit cover with elastic force so as to closely contact the unit cover.

Further, a support unit is fixed to both ends of the guide rail, and the support screw is used to attach the support unit to the guide rail.
The pair of pulleys may be rotatably supported.

[Action]

A winding device that winds the belt-shaped dust-proof cover with spring force is not required, and the force that changes the strength does not act on the slider, and the belt tension does not change over time. Slider actuation is obtained. Also, dust does not get around on the back surface of the belt-shaped dustproof cover. Since the belt-shaped dustproof cover is endlessly rotated via a pulley, it does not take up space even for long strokes.

When the belt-shaped dustproof cover is brought into close contact with the unit cover by the elastic force of the belt retainer, dust can be scraped off.
The sealing property is further improved.

Further, if one end of the feed screw shaft and the pair of pulleys are commonly supported by the support unit, one layer can be made compact.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 8 show an embodiment of the present invention. The ball rolling grooves 12 in the axial direction are formed symmetrically on both the left and right inner side surfaces 11a of the guide rail 11 having a concave (U-shaped) cross section.

A rectangular slider 13 is fitted in the recess of the guide rail 11. The slider 13 has ball rolling grooves 14 formed on the left and right outer side surfaces thereof so as to face the ball rolling grooves 12 of the guide rail 11. Also, this ball rolling groove 1
A through hole, which is to be the ball return hole 15 and is parallel to the hole 4, is formed in the inner wall thickness. An end cap 16 is fixed to the front and rear ends of the body of the slider 13, and the ball rolling grooves 12 and 14 and the ball return hole 15 are attached to the end cap 16.
A curved path 17 is formed in the shape of a half donut for connecting the and at the ends.

A large number of balls 18 are provided in the ball rolling groove 12 of the guide rail 11 and the ball rolling groove 14 of the slider 13 facing the ball rolling groove 12.
Is rotatably fitted. When the slider 13 moves, these balls 18 travel while rolling in the ball rolling grooves 12 and 14 in the traveling direction of the slider 13 with respect to the guide rail 11, and pass through the curved path 17 and the ball return hole 15. It circulates.

Further, a screw hole 20 is formed in the axial center portion of the slider 13 for penetrating in the axial direction. Regarding the female screw hole 20, a through hole is provided in the axial center portion of the slider 13, and the ball nut 2 having the female screw hole 20 in the through hole.
1, the female screw hole 20 is formed by being fitted in the slider 13 as shown in FIG. 3, but the female screw hole 20 may be directly formed in the axial center portion of the slider 13. A male thread 22 is provided in the female thread hole 20.
A feed screw shaft 22 having A is screwed through a large number of balls 23. The ball 23 has a female screw hole 20 and a male screw 2
It is rotatably fitted in the spiral groove of 2A, and the feed screw shaft 2
In accordance with the rotation of 2, the ball travels while rolling between the spiral grooves, turns the spiral groove, and then returns to the original position through the ball circulation path 24 to repeat the circulation. The rotation of the feed screw shaft 22 causes the slider 1 to move.
3 is configured to be able to move straight in the axial direction (see FIG. 4).

In addition, on the upper surface of the slider 13, two driven body mounting projections 13B having mounting screw holes 13A are formed near the outer edge and parallel to the axial direction and project outward from the upper end surface of the guide rail 11. Has been done.

Both ends of the feed screw shaft 22 are rotatably supported by support units 26a and 26b fixed to the bottoms of both ends of the guide rail 11 by screws 25, respectively.
One end of the feed screw shaft 22 further extends through the support unit 26a, and is connected to an output shaft 28a of a drive motor 28 via a coupling 27 attached to the end thereof.
The drive motor 28 is attached to an end plate 29 fixed to the front end of the guide rail 11.

As shown in FIG. 5, a pair of screw holes 30 orthogonal to the feed screw shaft 22 are provided on both left and right side surfaces of the support units 26a and 26b. One end of a shaft 31 is screwed into the screw hole 30. The other end of the shaft 31 has a shaft mounting hole 3 penetrating the side surface of the guide rail 11.
It is inserted through 1A and fixed with a cap nut 32. Thus, the support units 26a and 26b and the guide rail 11
A pair of left and right shafts 31 supported by and are rotatably attached via bearings 33, respectively. Pulley 3
No. 4 needs to be able to move the mounting position to some extent in the axial direction of the guide rail 11 for adjusting the tension. Therefore, the insertion hole 25A of the screw 25 for fixing the one support unit 26b and the shaft mounting hole 31A are axially It has a long hole.

In this manner, the pair of left and right pulleys 34 supported at the end portions of the guide rail 11 are connected to each other.
The endless dust-proof belt 36 is hung between the front and rear pulleys 34. Each dustproof belt 3
6, a slider mounting hole 37 is formed as shown in FIG. In addition to this, the driven body mounting projection 1 of the slider 13
The dustproof belt 36 is fixed to the slider 13 by inserting 3B, applying a belt fixing plate 38, and tightening a belt fixing bolt 39. The belt material can be steel, rubber, leather, plastic, etc., and is selected according to the specifications. The tension of the dust-proof belt 36 is adjusted by moving the support unit 26b in the axial direction by utilizing the screw insertion hole 25A and the long hole of the shaft mounting hole 31A to adjust the position of the pulley 34 back and forth. You can

An upper opening and a rear opening (right end of the guide rail in FIG. 2) of the guide rail 11 are covered with a unit cover 41 attached to the guide rail 11. This unit cover 4
1 is provided with two parallel elongated holes 42 extending in the moving direction of the slider 13 so as not to hinder the axial movement of the driven body mounting projection 13B of the slider. This long hole 42
Is positioned on the dustproof belt 36 with the unit cover 41 fixed to the guide rail 11, and the elongated hole 42 is closed.

At the end of the elongated hole 42 of the unit cover 41, a belt retainer 43 as shown in FIG. 7 is screwed and attached to the back surface side (see FIG. 8). This belt presser 43
It has an elastic tongue 44 that is somewhat curved and protrudes, and the elastic force of this elastic tongue 44 causes the dust-proof belt 36 to be brought into close contact with the back surface of the unit cover 41 to enhance the sealing performance.

Next, the operation will be described.

The feed screw shaft 22 is driven to rotate normally and reversely by the forward / reverse operation of the drive motor 28, and the slider 13 guided and supported inside the guide rail 11 is reciprocally driven. The driven body mounting projection 13B of the slider projects to the outside of the unit cover 41 that covers the upper surface of the guide rail 11, and moves back and forth in the axial direction along a long hole 42 that opens to the upper surface of the cover. At this time, the pulley 3
Since the dustproof belt 36 endlessly attached to the slider 13 via 4 also moves with the movement of the slider 13, the opening of the slot 42 is always closed by the dustproof belt 36 regardless of the movement of the slider 13. Is in a broken state. The dust-proof belt 36 is pulled by the pulley 34,
It contacts the back surface of the unit cover 41 without slack,
Since the tension level does not fluctuate as in the case of the conventional winding device method, the sealing property is very good, and the dust attached to the dustproof belt 36 does not fall into the guide rail 11.
At the end of the long hole 42, the belt retainer 43 is attached to the dustproof belt 3
Since 6 is pressed against the back surface of the unit cover 41, the dust on the dustproof belt 36 is scraped off by the edge of the elongated hole 42 and completely removed.

On the contrary, it is completely prevented that the lubricant splashes from the feed screw device or the linear guide device are exposed to the outside of the dust-covered feeder.

Further, since the pulley 34 is supported via the bearing 33, extremely smooth rotation can be obtained. Moreover, since the dustproof belt 36 is endless, the belt length is always constant,
Not only is it easy to assemble, but unlike the conventional case, the belt tension does not fluctuate with the fluctuation of the winding diameter, and does not change with time due to deterioration of the spring.
Stable operation of the slider can be obtained without exerting a force whose strength changes via the slider 13, and as a result, the positioning accuracy of the slider 13 is high.

Further, since the surface of the dustproof belt 36 stretched endlessly by using the pulley 34 cannot overlap with the back surface of the belt, the dust on the front surface side does not spill on the back surface of the dustproof belt 36.

Also, after the dustproof belt 36 is changed in direction by the pulley 34,
Since a slight gap between the bottom surface of the slider 13 and the guide rail 11 is used for the return, the required space is irrelevant to the length of the dustproof belt 36, and no extra space is required even for a long stroke.

FIG. 9 shows another embodiment.

In this embodiment, the pulley 34 on the side of the support unit 26a is
The mounting structure of the shaft 31 is different from that of the above embodiment.

That is, one end of the shaft 31 has the support unit 2
6a is fixed and supported by fitting instead of screwing. On the other hand, the opposite end side is fixedly supported not by the cap nut but by the set screw 51 screwed into the screw hole 50 formed in the guide rail 11, so that there is an advantage that it does not project to the outer side surface of the guide rail 11. Other actions and effects are similar to those of the above-mentioned embodiment.

10 and 11 show a modified example of the slider mounting hole 37 in the dustproof belt 36.

In FIG. 10, a plurality of round holes 53 are used instead of the rectangular long holes.
Has been formed. Driven body mounting projection 13 of slider 13
B is also formed in a cylindrical shape and is inserted into this round hole 53.

In FIG. 11, the notch 54 is formed.

The dustproof belt 36 is not necessarily an endless belt, and a long flat belt may be used. In addition, a set of two pieces is not always used, and only one piece may be used. In that case, the drive system of the feed screw shaft 22 may be changed to another system. For example, as shown in FIG. 12, the gear motor 55 is used to mount the drive motor 28 on the side surface of the guide rail 11. You can also Reference numeral 56 is a pulley for changing the direction of the dustproof belt 36, and 57 is a support unit for the feed screw shaft 22.

[Effect of device]

As described above, according to the present invention, as compared with a feeder in which a lead screw device is incorporated in a linear guide device having a guide rail having a concave cross section and an axial ball rolling groove on its inner surface, , Equipped with a dustproof cover having a dustproof belt that enables endless axial rotation drive via pulleys.
Therefore, there is no change in strength and weakness such as spring force and deterioration over time, high positioning accuracy of the slider and long-term stable sealing performance can be guaranteed, and the required space is small and it can be easily applied to long strokes. There is an effect that it is possible to provide a feeding device with a dustproof cover, which is provided with a dustproof cover that prevents dust from turning around on the back surface.

[Brief description of drawings]

FIGS. 1 to 8 show an embodiment of the present invention. FIG. 1 is a partially cutaway plan view, FIG. 2 is a side view of the same, and FIG. 3 is III of FIG. -III line sectional view, FIG. 4 is a IV-IV line sectional view of FIG. 1, FIG. 5 is a VV line sectional view of FIG. 1, and FIG. 6 is a perspective view of the dust-proof belt of FIG. FIG. 7 is a perspective view of the belt retainer, FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 1, and FIG. 9 is a sectional view corresponding to FIG. 5 of another embodiment of the present invention, FIG. 10, FIG. FIG. 12 is a perspective view of a modified example of the dustproof belt, FIG. 12 is a plan view of a main part of a modified example of the drive system in the case of a single belt, and FIG. 13 is a schematic side view of a conventional feeder with a dustproof cover. . 1, 11 are guide rails, 12 and 14 are ball rolling grooves,
2, 13 are sliders, 13B ... Driven object mounting projections, 1
6 is an end cap, 18 is a ball, 22 is a feed screw shaft, 26a and 26b are support units, 28 is a drive motor, 34 is a pulley, 36 is a dustproof belt, 41 is a unit cover, 42 is a long hole, and 43 is a belt retainer. .

Claims (3)

[Scope of utility model registration request] 1. A guide rail having a concave cross-section and having an axial ball rolling groove on its inner surface, and a ball rolling groove facing the ball rolling groove of the guide rail, which is parallel to the outer surface. An end cap having a semi-doughnut-shaped curved path for connecting the ball rolling groove and the ball return hole is fixed to the end while having a through hole that serves as a ball return hole in the inner wall thickness. A screw hole in which the screw is screwed is provided in the axial center part, and the slider moves along the guide rail, the ball rolling groove of the guide rail and the ball rolling groove of the slider facing the ball rolling groove. A large number of balls that freely fit and circulate through the curved path and the ball return hole, and allow the axial movement of the driven body mounting projection of the slider that protrudes outside from the upper opening of the guide rail. A parallel length extending in the axial direction A unit cover for covering the opening of the guide rail, a dustproof belt fixed to the slider so as to be movable along with the movement of the slider by closing the elongated hole of the unit cover, and the dustproof belt for guiding the dustproof belt. A feed device with a dustproof cover, comprising a pair of pulleys rotatably supported at both ends of a guide rail. 2. The feeder with a dustproof cover according to claim 1, wherein a belt retainer for pressing the dustproof belt against the unit cover by elastic force is attached to the unit cover. 3. A support unit is fixedly attached to both ends of the guide rail, and the support screw unit rotatably supports the feed screw shaft and the pair of pulleys. A feeder with a dustproof cover according to claim (1) or (2).