JP2011021745A - Linear motion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the entry of dust into a housing without pressing a strip sealing band to an opening. <P>SOLUTION: A linear motion device includes a side cover which has an attaching member and is provided at the opening of a housing, a slider which is made to protrude from the opening of a table and accommodated so as to be movable reciprocally in the longitudinal direction of the housing, a strip sealing band with both ends fixed to the housing in such a way as to cover the opening riding over the top surface of the table and both side portions fixed by the attaching member, and a sealing band guide section which forms a curved portion on the strip sealing band riding over the top surface of the table when the table is moved. The strip sealing band has length of riding over the table top surface and sealing the opening. The sealing band guide portion contacts the strip sealing band and bends it when the strip sealing band rides over the table top surface, and which fixes the strip sealing band in the area not riding over the table top surface to the attaching member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a linear motion device that linearly moves a slider by, for example, a ball screw or a cylinder, and in particular, a dustproof device between a table connected to the slider and a housing that houses the slider for operating the table. Regarding improvement.

Conventionally, this type of linear motion device has been provided with a belt-like seal band at the opening of the housing in order to prevent dust from entering the housing.
In order to make the belt-like seal band adhere to the opening of the housing, the belt-like seal band is pressed against the housing opening by a roller, a scraper or the like from the upper surface of the belt-like seal band.

In addition, in order to prevent the band-shaped seal band from being lifted from the housing and creating a gap between the band-shaped seal band and the opening of the housing, the structure is such that a tension is applied to the band-shaped seal band and the tension state is always maintained. It was.
As a method of applying tension to the belt-like seal band, a structure has been adopted in which a roller or a scraper is pressed against the upper and lower surfaces of the belt-like seal band.
Further, in order to keep the tension of the belt-like seal band properly, the roller and the scraper are supported by an elastic member such as a spring.

Japanese Utility Model No. 63-172545 microfilm Japanese Utility Model No. 3-33041 microfilm JP 2000-61681 A JP 2000-197304 A JP 2006-43856 A

However, the conventional dust-proof structure of the seal band requires a mechanism for pressing the band-shaped seal band against the opening of the housing and a mechanism for applying tension to the band-shaped seal band, or a band-shaped seal band to reduce friction due to tension. A roller and a low friction material had to be used between the table and the table, and the structure was complicated.
In addition, there is a problem that the sliding resistance of the apparatus itself is large due to the tension and friction of the belt-like seal band, and the load on the motor for driving the apparatus is large.

  The present invention has been made to solve such a conventional problem, and the object thereof is to apply no tension to the band-shaped seal band, and without pressing the band-shaped seal band against the opening of the housing. An object of the present invention is to provide a rectilinear device capable of preventing dust from entering the housing.

  The invention according to claim 1 includes a housing that forms an opening in the longitudinal direction, a side cover that is provided along the opening on both sides of the opening, and that is provided along the opening on each opening side of the side cover. An adhering member, a table standing upright, a slider projecting from the opening so that the table can be reciprocated in the longitudinal direction of the housing, and both ends of the housing over the upper surface of the table so as to cover the opening Are fixed, and both side portions are fixed by the adhering member, and a seal band guide portion that forms a curved portion in the seal band that gets over the upper surface of the table when the table is moved. It has a length that covers the top surface of the table and closes the opening, and the seal band guide part has a strip-shaped seal band that crosses the top surface of the table. In contact with the strip-like seal tape is curved strip of sealing band, characterized in that to produce a biasing force for fixing a strip-shaped seal band in the region not beyond the upper surface of the table to the attachment member when.

According to a second aspect of the present invention, in the linear motion device according to the first aspect, the seal band guide portions are provided at the front and rear portions in the longitudinal direction of the table.
According to a third aspect of the present invention, in the linear motion device according to the first or second aspect, the seal band guide portion hangs from the upper surface of the table toward the upper surface of the side cover and has a gap with respect to the upper surface of the side cover. It is characterized by being arranged.

According to a fourth aspect of the present invention, in the linear motion device according to the first aspect, the seal band guide portions are provided at the front and rear portions in the longitudinal direction of the table cover attached to the table.
According to a fifth aspect of the present invention, in the linear motion device according to the first or fourth aspect, the seal band guide portion hangs down from the upper surface of the table cover toward the upper surface of the side cover and has a gap with respect to the upper surface of the side cover. It is characterized by being placed.

The invention according to claim 6 is the linear motion device according to any one of claims 1 to 5, wherein the upper surface of the table is formed in an arch shape in which the longitudinal front and rear portions are lower than the central portion. To do.
The invention according to claim 7 is the linear motion device according to any one of claims 1 to 6, wherein the adhering member is a magnet sheet, and the belt-like shield band is made of a magnetic material. .

The invention according to claim 8 is the linear motion device according to any one of claims 1 to 6, wherein the adhesion member is silicon rubber, urethane, or urethane coated with an adhesive.
The invention according to claim 9 is the linear motion device according to any one of claims 1 to 8, wherein the slider is composed of two members and is arranged in series in the longitudinal direction of the housing.

According to a tenth aspect of the present invention, in the linear motion device according to the ninth aspect, the seal band guide portions are provided at the longitudinal front and rear portions and the middle portion of the table cover attached to the table. .
The invention according to claim 11 is the linear motion device according to any one of claims 1 to 10, wherein the width of the seal band guide portion is 50 to 80% of the width of the seal band.

According to the present invention, since the band-shaped seal band is not pressed from the upper surface when being fixed to the adhesion member, the sliding resistance of the table with respect to the band-shaped seal band is small, and the urging means is unnecessary, so the structure is simple. It is.
According to the present invention, since no tension is applied to the belt-like seal band, the sliding resistance of the table with respect to the belt-like seal band is small, and the structure is simple.

According to the present invention, when the table moves, there is no contact with the belt-like seal band, and therefore the sliding resistance of the table with respect to the belt-like seal band is small.
ADVANTAGE OF THE INVENTION According to this invention, while preventing intrusion of dust, it can have a dustproof function, and the enlargement of an apparatus can be prevented.
In addition, since the sliding resistance of the table with respect to the band-shaped seal band is small, high-precision positioning is possible, and the load on the motor that drives the linear motion device is small and energy saving, contributing to a longer life. .
In addition, since it is not necessary to apply tension to the band-shaped seal band, the seal band guide portion is only in contact with the upper surface of the band-shaped seal band, and has low sliding resistance and tension on the band-shaped seal band. In order to adjust, it is not necessary to support a roller or a scraper with an elastic member such as a spring.

Further, since the lower surface of the strip-shaped seal band does not come into contact with the upper surface of the table, unnecessary tension is not generated on the strip-shaped seal band, and the sliding resistance is low.
Further, the load resistance of the table can be increased by arranging two members in series in the slide or using a slide having a long overall length.
In addition, in order to increase the load capacity of the table, even when the slide is extended and the two members are arranged in series, the seal band guide portion is added to the middle portion to bring the table inward. It is possible to prevent contact and reduce the contact area on the upper surface of the belt-like seal band.

It is a top view of the linear motion apparatus which concerns on one Embodiment of this invention. It is sectional drawing along the AA line of FIG. It is sectional drawing along the BB line of FIG. FIG. 2 is a perspective view illustrating the table cover 16 and the belt-like seal band 23 of the linear movement device of FIG. 1 with the seal band guide portion 16d of the table cover 16 remaining. It is sectional drawing which expands and shows the principal part of FIG. It is a perspective view which expands and shows the principal part of FIG. It is sectional drawing which shows the relationship between the table 12, the table cover 16, the seal band guide part 16d, and the strip | belt-shaped seal band 23. FIG. It is a perspective view which shows the table 12 provided with the seal band guide part. It is a perspective view of the linear motion apparatus which concerns on 2nd embodiment of this invention. FIG. 10 is a perspective view showing the table 12 with the table cover 16 of the linear movement device of FIG. 9 removed and the seal band guide portion 16j of the table cover 16 left. It is a perspective view which expands and shows the principal part of FIG. It is sectional drawing which shows the relationship between the two tables 12, the table cover 16, two seal band guide parts 16d, the center seal band guide part 16e, and the strip | belt-shaped seal band 23. FIG.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[First embodiment]
1 to 7 show a linear motion device according to a first embodiment of the present invention.
In the figure, reference numeral 1 denotes a motor, and 2 denotes a bracket for connecting the ball screw 3 housed in the housing 4 and the motor 1.
As shown in FIGS. 1 and 2, one end of the bracket 2 is connected to the motor 1 via a screw. The bracket 2 is provided with a hollow portion 2a in the axial direction of the housing 4, and a connecting portion 9 such as a coupling is provided in the hollow portion 2a. The motor shaft 1 a is connected to the screw shaft 10 of the ball screw 3 in the connecting portion 9.

  As shown in FIGS. 2 and 3, the housing 4 has an axial ceiling portion that forms an opening 20 along the moving direction of the slide block 11, that is, along the axial direction, and both ends in the axial direction are open. Yes. The recess 4a formed by the opening 20 is a guide groove for reciprocally storing a slide block (slider) 11 reciprocally moved by the ball screw 3 in the axial direction along the axial direction of both inner side surfaces 4b of the recess 4a. 13 is formed.

In addition, the housing 4 is closed by connecting the bracket 2 to one open end via a screw and closed to the other open end by a flange 5 being connected via a screw.
The slide block 11 has a table 12 on the upper surface.
2 and 3, the ball screw nut 18 of the ball screw 3 is disposed on the slide block 11, and the slide block 11 slides along the guide groove 13 formed in the recess 4 a of the housing 4. Then, the table 12 is reciprocated together with the ball screw nut 18 of the ball screw 3.

The table 12 is configured to reciprocate through the opening 20 of the housing 4.
In the axial direction on both sides of the opening 20 of the housing 4, as shown in FIGS. 1 to 3, the side cover 8 is connected via screws. On the upper surface 8 a of the side cover 8, a band-shaped seal band 23 is disposed so as to close the opening 20.

  As shown in FIGS. 1 to 7, the belt-like seal band 23 is provided so as to pass over the table 12 so as to cover from the upper surface of the table 12 to both side portions 12 b in the axial direction of the housing 4. Both end portions in the longitudinal direction of the belt 23 are fixed to the bracket 2 and the flange 5 by screws 30 a, and both side portions in the longitudinal direction of the belt-like seal band 23 are attracted to the side cover 8 by the magnet 7 provided on the side cover 8. ing.

The belt-like seal band 23 is desirably an elastic stainless steel sheet or the like that can obtain an appropriate curve in accordance with the inclination of both side portions 12b of the table 12, and is made of, for example, a magnetic material having a certain degree of springiness. For example, there are martensitic stainless steels such as SUS440 and SUS410, precipitation hardened stainless steels such as SUS631 and SUS632, ferritic stainless steels such as SUS430, and SK materials. For example, a non-magnetic stainless sheet such as austenitic stainless steel such as SUS303, SUS304, SUS316, and SUS304 cannot be used as the belt-like seal band 23 because it is not attracted to the magnet 7.
The spring property means a characteristic like a leaf spring generated by the elasticity of the belt-like seal band 23.

The table 12 is formed in an arch shape in which the center portion rises from both side portions 12 b in the axial direction of the housing 4. The table 12 is provided with two recesses 12c into which the upper surface 8a of the side cover 8 provided with the magnets 7 can be inserted from both sides. A constricted portion 12d is formed on the table 12 by the two concave portions 12c.
The table 12 forms a substantially horizontal virtual table surface 34 by raising a plurality of protrusions 12a upward. A table cover 16 is attached to the table 12 so as to cover a portion of the table 12 excluding the table surface 34.

The table cover 16 includes a rectangular upper surface plate 16a having a width slightly narrower than the width of the housing 4, a side surface plate 16b provided to hang downward on both sides of the upper surface plate 16a, and an upper surface plate 16a. It is comprised by the front-and-back surface plate 16c provided by drooping toward the front and back downward.
The lower end portions of the side plate 16b and the front and rear surface plates 16c are formed in parallel with the upper surface 8a of the side cover 8, and the lower end portions of the side plate 16b and the front and rear surface plates 16c are the upper surfaces of the side covers 8 as shown in FIG. 8a and a certain gap S are arranged.

Inside the front and rear surface plate 16 c of the table cover 16, seal band guide portions 16 d are provided for bringing the belt-like seal band 23 into close contact with the side cover 8 by the magnet 7 provided on the side cover 8.
The band-like seal band 23 is fixed to the bracket 2 and the flange 5 with screws 30a, but the length of the band-like seal band 23 in the axial direction has a surplus portion so that it can pass across the table 12. .

For this reason, when both ends of the belt-like seal band 23 are fixed by the attractive force of the magnet 7, the surplus portion of the belt-like seal band 23 pressed from the upper surface by the seal band guide portion 16 d becomes the belt-like seal band 23. The curved portion 23a is naturally formed by its own springiness.
Further, the curved portion 23a exhibits a biasing function for attracting the belt-like seal band 23 to the magnet 7 due to the spring property of the belt-like seal band 23 itself. Thus, the belt-like seal band 23 can be attracted to the magnet 7.

Further, the band-shaped seal band 23 passes between the lower side of the table cover 16 and the upper side of the table 12, but the curved portion 23a of the band-shaped seal band 23 is also formed inside the upper surface plate 16a of the table cover 16. The length is adjusted so as not to contact the upper surface of the table 12.
The upper surface of the table 12 has an arch shape and is not in contact with the belt-like seal band 23 in a normal state, but has an auxiliary role of attaching the table cover 16 to form the curved portion 23a.

  Further, the seal band guide portion 16d does not have a structure for pressing the belt-like seal band 23 against the magnet 7, but is attached to the table cover 16 with a gap with respect to the upper surface 8a of the side cover 8, so that the belt-like seal band 23 is provided. Friction force to hold down does not occur. Furthermore, since the force applied to the contact portion between the band-shaped seal band 23 and the seal band guide portion 16d is only the force due to the spring property of the band-shaped seal band 23 itself, almost no frictional force is generated.

Next, the relationship among the table 12, the table cover 16, the seal band guide portion 16d, and the strip-shaped seal band 23 will be described with reference to FIG.
Here, the dimension F is the distance in the axial direction of the table cover 16, the dimension C is the distance between the seal band guide portions 16d, and the dimension X is a band-shaped seal band (attached to the side cover 8) from the ceiling surface of the table cover 16. The distance to 23) and the dimension Y are the distance between the top of the table 12 and the belt-like seal band (position attached to the side cover 8) 23, and the dimension Z is the seal-band guide portion 16d and the belt-like seal. The distance from the band (position attached to the side cover 8) 23, rD is the radius of curvature of the band-shaped seal band 23, and rE is the radius of curvature of the contact portion of the seal band guide portion 16d with the band-shaped seal band 23. To do.

The conditions in this embodiment are as follows. The dimension Y is essential for the structure. We want to make the dimension X as low as possible. The dimension F is desired to be shortened in order to earn a stroke of the table 12. The radius of curvature rD of the belt-like seal band 23 and the radius of curvature rE of the contact portion of the seal-band guide portion 16d with the belt-like seal band 23 affect the life of the belt-like seal band 23, so that they should be as large as possible.
In order to increase the curvature radius rD of the strip-shaped seal band 23 and the curvature radius rE of the contact portion of the seal band guide portion 16d with the strip-shaped seal band 23, it is necessary to increase the dimension C. Increasing the size also increases the size F at the same time.

  Therefore, the seal band guide portion 16d is floated by the dimension Z, and a chamfer 16d ′ is provided at the tip of the seal band guide portion 16d, so that the radius of curvature rD of the belt-like seal band 23 and the seal can be increased without increasing the dimension C. The curvature radius rE of the contact portion of the band guide portion 16d with the belt-like seal band 23 can be increased.

Therefore, instead of firmly pressing the upper surface of the strip-shaped seal band 23, the seal band guide portion 16d can be pressed in the middle of the inclination of the curved portion 23a of the strip-shaped seal band 23 by the seal band guide portion 16d. The position was determined.
Further, the chamfer 16d ′ can reduce the load on the band-like seal band 23 by reducing the surface pressure applied to the band-like seal band 23, and can impart durability and the like.
Further, the seal band guide portion 16d is smaller than the width of the band-shaped seal band 23, and the vicinity of both sides of the band-shaped seal band 23 is not in contact with each other, so that deterioration of both sides of the band-shaped seal band 23 can be prevented. The width of the seal band guide portion 16d is preferably 50 to 80% with respect to the width of the band-shaped seal band 23.

Next, the operation of the linear motion device according to the present embodiment will be described with reference to FIGS.
When the screw shaft 10 of the ball screw 3 is operated by the operation of the motor 1, the ball screw nut 18 moves in the axial direction along the screw shaft 10 as the screw shaft 10 rotates. Along with this, the slide block 11 moves along the axial direction. As the slide block 11 moves, the table cover 16 moves over the band-shaped seal band 23, and the table 12 moves under the band-shaped seal band 23.

At this time, since the curved portion 23a of the belt-like seal band 23 is also moved in conjunction with the seal band guide portion 16d, it is possible to always move in a non-contact state between the table 12 and the table cover 16, and the belt-like seal band. Thus, a dust-proof structure with less sliding resistance due to tension with respect to 23 and friction accompanying the tension can be obtained.
Since the band-shaped seal band 23 is provided on the upper surface 8 a of the side cover 8 so as to close the opening 20, it is possible to prevent a problem that dust or the like enters from the opening 20. When the table 12 is moved, it moves while pressing the belt-like seal band 23 by the seal-band guide portion 16d, so that the belt-like seal band 23 and the side cover 8 can always be brought into close contact with each other and are covered with the table cover 16. Intrusion of dust from a non-existing portion can be prevented.

The band-shaped seal band 23 tends to float on the bracket 5 side when the table 12 is on the motor 1 side, and float on the motor 1 side when the table 12 is on the bracket 5 side. In particular, the tendency becomes stronger as the overall length becomes longer.
This phenomenon is eliminated by providing the side cover 8 with the magnet 7.
Therefore, as in the present embodiment, even if the belt-like seal band 23 is fixed in a relaxed state without being pulled, it can be adjusted without floating in the entire region.

  In addition, although the said embodiment demonstrated the case where the strip | belt-shaped seal band 23 was adsorb | sucked using the magnet sheet 7, this invention is not restricted to this, For example, you may use a self-adhesive material. In this case, the belt-like seal band 23 is not limited to a magnetic material, and may be other materials such as a nonmagnetic material. Examples of the self-adhesive material include silicon rubber, urethane, or urethane coated with an adhesive material.

  Moreover, although the said embodiment demonstrated the case where the table cover 16 provided with the seal band guide part 16d was attached to the table 12, this invention is not limited to this, For example, as shown in FIG. The seal band guide portion 12e may be integrally provided on the front and rear surfaces of the table 12 in the longitudinal direction.

[Second Embodiment]
The figure thru | or figure shows the linear motion apparatus which concerns on 2nd embodiment of this invention.
The linear motion device may be required to increase the length of the table 12 in order to increase the load resistance of the table 12.
However, in the linear motion apparatus according to the first embodiment, when the load resistance of the table 12 is increased, the table 12 has recesses 12c into which the side covers 8 are inserted on both sides in the longitudinal direction as shown in FIG. Therefore, the constricted portion 12d is formed on the table 12, and the strength of the table 12 may be reduced.

Therefore, in this embodiment, it is possible to increase the load resistance of the table 12 by increasing the length of the table 12 and increasing the cross-sectional area of the constricted portion 12d.
When the curved portion 23a of the strip-shaped seal band 23 passing through the upper side of the table 12 is lengthened, only the seal band guide portions 16d provided at both ends of the table 12 can move the strip-shaped seal band 23 to the inside of the table cover 16. The upper surface may come into contact over a wide range, causing sliding resistance due to friction, or wearing parts.

Therefore, in the linear motion device according to the present embodiment, two slide blocks 11 are connected in series and arranged inside the table cover 16 at the center position of the seal band guide portions 16d provided at both ends of the table 12. A seal band guide 16e is added.
Other configurations are the same as those of the linear motion device according to the first embodiment using one slide block 11.

Next, the reason why it is desirable to provide the seal band guide portion 16e at the center position of the table 12 in this embodiment will be described.
a. In order to prevent the bending portion 23a from being biased when the slide block 11 moves, it is necessary to equally distribute the bending portion 23a into two. For this reason, the intermediate seal band guide portion 16e is preferably near the center of the seal band guide portion 16d provided at both ends of the table 12.
b. In order to prevent the bending portion 23a from being biased when the slide block 11 moves, it is necessary to equally distribute the bending portion 23a into two. For this reason, it is desirable that the lower surface of the intermediate seal band guide portion 16e is located at a position lower than the apex of the curved portion 23a divided into two.

c. In order to prevent the deterioration of the belt-like seal band 23 in the vicinity of both measurements, the width of the intermediate seal band guide portion 16e is the same as the width of the seal band guide portion 16d provided at both ends of the table 12, and 50 to 80% of the width is desirable.
As shown in FIG. 18, the tip end of the seal band guide portion 16e is strip-like to avoid contact with the strip-like seal band 23 in the same manner as the chamfer 16d 'provided at the tip portion of the seal band guide portion 16d. In order to reduce the load on the seal band 23 and to provide durability and the like, a chamfer 16e ′ is provided to reduce wear on the band-like seal band 23.

In this embodiment, the case where the slide block 11 is divided into two pieces and connected in series has been described. However, the present invention is not limited to this, and the entire length of one slide block 11 may be increased. good.
Moreover, although the case where the ball screw 3 was used as an actuator was demonstrated in the said embodiment, this invention is not limited to this, For example, the cylinder and linear motor which use the fluid may be used.

DESCRIPTION OF SYMBOLS 1 Motor 2 Bracket 3 Ball screw 4 Housing 5 Flange 7 Magnet 8 Side cover 8a Top surface 10 of the side cover 8 Screw shaft 11 Slide block 12 Table 12c Recessed portion 12d Constricted portion 12e Seal band guide portion 13 Guide groove 16 Table cover 16a Top plate 16b Side plate 16c Front and rear plates 16d, 16e Seal band guide 18 Ball screw nut 20 Opening 23 Band-shaped seal band 34 Table surface

Claims (11)

A housing forming an opening in the longitudinal direction;
A side cover provided along the opening on both sides of the opening;
An attachment member provided along the opening on each opening of the side cover;
A slider which is erected in a standing manner and is reciprocated in the longitudinal direction of the housing by projecting the table from the opening;
Both ends are fixed to the housing so as to get over the upper surface of the table and cover the opening, and a seal band to which both sides are fixed by the adhesion member;
A seal band guide part that forms a curved part in the seal band over the upper surface of the table when the table is moved, and
The seal band has a length to get over the upper surface of the table and close the opening,
The seal band guide portion bends the seal band in contact with the seal band when the seal band gets over the upper surface of the table, and causes the seal band in a region not over the upper surface of the table to the attachment member. A linear motion device characterized by generating an urging force to be fixed. The linear motion device according to claim 1,
The linear motion device, wherein the seal band guide portion is provided at the front and rear portions of the table in the longitudinal direction. The linear motion device according to claim 1 or 2,
The seal band guide portion is suspended from the upper surface of the table toward the upper surface of the side cover, and is disposed with a gap with respect to the upper surface of the side cover. The linear motion device according to claim 1,
The linear motion device, wherein the seal band guide portion is provided in the longitudinal front and rear portions of a table cover attached to the table. In the linear motion device according to claim 1 or 4,
The linear motion device according to claim 1, wherein the seal band guide portion hangs from the upper surface of the table cover toward the upper surface of the side cover and is spaced from the upper surface of the side cover. The linear motion device according to any one of claims 1 to 5,
The upper surface of the table is formed in an arch shape in which the front and rear portions in the longitudinal direction are lower than the center portion. The linear motion device according to any one of claims 1 to 6,
The adhesion member is a magnet sheet,
The said shield band is comprised with the magnetic material. The linear motion apparatus characterized by the above-mentioned. The linear motion device according to any one of claims 1 to 6,
The adhesion member is silicon rubber, urethane, or urethane coated with an adhesive. The linear motion device according to any one of claims 1 to 8,
The slider is composed of two members and is arranged in series in the longitudinal direction of the housing. The linear motion device according to claim 9,
The linear motion device, wherein the seal band guide portion is provided at the longitudinal front and rear portions and the intermediate portion of a table cover attached to the table. The linear motion device according to any one of claims 1 to 10,
The width of the seal band guide part is 50 to 80% with respect to the width of the seal band.

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