JP4800798B2 - Exercise guidance device - Google Patents

Description

  The present invention relates to a motion guide device that is used in a slide unit of a machine tool, an industrial robot, or a parts conveyance system, and guides movement of a guide target such as a table.

  The applicant has developed a motion guide device that enables continuous travel on a track rail having a straight portion and a curved portion with one type of moving block (see Patent Document 1). The track rail of the motion guide device is configured by connecting a plurality of segment rails extending in a curved line, or a segment rail extending in a curved line and a segment rail extending in a straight line. A ball rolling groove is formed on a side surface of the segment rail to be a track when the ball rolls. A plurality of balls arranged and accommodated in the moving block roll in the ball rolling groove on the side surface of the segment rail. In this motion guide device, one type of moving block continuously travels from a straight segment rail to a curved segment rail, or conversely, from a curved segment rail to a straight segment rail. Since the track rail is configured by combining a straight portion and a curved portion, there is an advantage that the degree of freedom of the movement locus of the guidance target is increased.

  However, when the guide object is actually attached to the moving block and the moving block is run, the segment rail ball is connected at the joint between the straight segment rail and the curved segment rail or between the curved segment rails. It was found that the so-called flaking phenomenon, in which the rolling grooves peel off, may occur earlier than the calculated predicted value.

In order to solve this problem, the applicant has proposed a motion guide device that reduces the load on the ball rolling groove by scraping the ball rolling groove at the end of the segment rail to form a crowning surface (patent) Reference 2). According to this improved motion guide device, the load applied to the ball rolling groove from the ball when the moving block passes through the joint can be reduced, so that the flaking phenomenon can be alleviated. However, since it takes time to process the crowning surface with high accuracy, the cost of the motion guide device is increased.
JP 2000-346065 A JP 2004-183683 A

  There are two possible causes of the flaking phenomenon. The first is a misalignment at an early stage when the track rail is attached to the base surface. It is extremely difficult to process the curved joint portion of the segment rail into a perfect circle. In addition, a straight segment rail can determine the reference and can be accurately attached to the base surface, but a curved segment rail makes it difficult to determine the reference and makes it difficult to attach to the base surface. For these reasons, a slight step is formed at the joint between the pair of segment rails in the initial stage. When the ball passes through the step, the ball rolling groove is partially overloaded, and the ball rolling groove is damaged.

  The second is not a misalignment at the initial stage, but a misalignment that occurs when the moving block passes through the joint. Even if there is no misalignment in the initial stage, misalignment occurs because the load balance of the ball becomes unbalanced when the moving block passes through the joint block. FIG. 1 is a diagram for explaining this phenomenon, and shows a state when the moving block moves at the joint between a pair of curved segment rails.

  As shown in FIG. 1A, when the moving block 1 is moving on one curved segment rail (rail 1), one location (2) on the outer peripheral side of the rail 1 and two locations on the inner peripheral side ( 1) Three representative balls in (3) are subjected to load. At this time, since the segment rail is sandwiched between the three balls (1), (2), and (3), the load applied to the rail 1 is balanced.

  As shown in FIG. 1 (B), when the moving block 1 further proceeds and moves from one segment rail (rail 1) to the other segment rail (rail 2), 3) crosses the joint and enters rail 2 first. At this time, if there is no pressing on the rail 2, the end of the rail 2 is shifted to the outer peripheral side. A step is generated at the joint between the rail 1 and the rail 2.

  As shown in FIG. 1C, when the moving block 1 further advances, the ball (2) collides with the step formed at the joint. Due to this, flaking phenomenon occurs early in the ball rolling grooves on the outer peripheral side of the rails 1 and 2.

  The present invention focuses on the cause of the occurrence of the flaking phenomenon described above, and an object thereof is to provide a motion guide device that can fundamentally prevent the occurrence of the flaking phenomenon.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiments.

In order to solve the above problems, the invention described in claim 1 has rolling element rolling surfaces (4) on both side surfaces and a plurality of segment rails (3c) extending in a curved shape, or extending in a curved shape. A track rail (7) configured by connecting a segment rail (3c) and a segment rail (3a, 3b) extending linearly, and the rolling element rolling surfaces (4) on both sides of the track rail (7). ), And has a rolling element circulation path including a linearly extending load rolling element rolling surface (9a), a moving block (8) that moves along the track rail (7), and the moving block ( A plurality of rolling elements (5) arranged in the rolling element circulation path of 8), and on the outer peripheral side of the curved segment rail (3c), the load rolling element rolling elements of the moving block (8) are provided. The rolling element (5a) in the center of the running surface (9a) is in contact with the rolling element rolling surface (4) of the segment rail (3c), and has a curved shape. On the inner circumference side of the segment rail (3c), the rolling elements (5b, 5c) at both ends of the load rolling element rolling surface (9a) of the moving block (8) are connected to the segment rail (3c). In the motion guide device in contact with the rolling element rolling surface (4), the joint (13) of a pair of segment rails (3c) is fixed to a base surface to which the track rail (7) is attached, and the joint (13 ) Between the pair of segment rails (3c), and a pair of abutting portions (15) that abut the side surfaces of the end portions of the pair of segment rails (3c). Provided is a misalignment prevention mechanism (14) having a pair of position adjusting screws (16) for pushing side surfaces toward the butting portion (15), and the pair of position adjusting screws (16) and the pair of butting portions (15) is the most the tether for attaching each of the segments rails (3c) on the base surface (13) disposed in said joint (13) than the bolt insertion holes (6) disposed in side, and the pair of position adjusting screw which is disposed on the outer peripheral side of the segment rail (3c) (16) or The pair of abutting portions (15) is more connected to the joint (13 than the pair of abutting portions (15) or the pair of position adjusting screws (16) disposed on the inner peripheral side of the segment rail (3c). ) Side.

The invention according to claim 2 has rolling element rolling surfaces (4) on both side surfaces, and a plurality of segment rails (3c) extending in a curved shape, or a segment rail (3c) extending in a curved shape and a linear shape The track rail (7) configured by connecting the segment rails (3a, 3b) extending in the direction opposite to the rolling element rolling surfaces (4) on both sides of the track rail (7) A rolling block circulation path including a rolling rolling element rolling surface (9a) that extends, a moving block (8) that moves along the track rail (7), and the rolling element circulation path of the moving block (8) A plurality of rolling elements (5) arranged on the outer peripheral side of the curved segment rail (3c), the central portion of the loaded rolling element rolling surface (9a) of the moving block (8) The rolling element (5) in contact with the rolling element rolling surface (4) of the segment rail (3c), and the curved segment rail (3c) On the side, the rolling elements (5) at both ends of the loaded rolling element rolling surface (9a) of the moving block (8) are in contact with the rolling element rolling surface (4) of the segment rail (3c). A displacement prevention mechanism (14) used for a motion guide device, wherein the joint (13) of a pair of segment rails (3c) is fixed to a base surface to which the track rail (7) is attached, and the joint ( 13) A pair of abutting portions (15) on which the side surfaces of the end portions of the pair of segment rails (3c) are abutted, and a side opposite to the side surface of the end portions of the pair of segment rails (3c) Each of the pair of position adjusting screws (16) and the pair of butting portions (15), respectively. A mounting bolt disposed closest to the joint (13) for mounting the segment rail (3c) to the base surface. The pair of position adjusting screws (16) or the pair of abutting portions (15) disposed on the side of the joint (13) with respect to the insertion hole (6) and disposed on the outer peripheral side of the segment rail (3c). ) Is disposed closer to the joint (13) than the pair of abutting portions (15) or the pair of position adjusting screws (16) disposed on the inner peripheral side of the segment rail (3c). Features.

  According to the invention of claim 1, when the moving block passes through the joint, it is possible to prevent the end portions of the pair of segment rails from shifting. Therefore, the flaking phenomenon caused by the movement block passing through the joint can be alleviated.

Further , the end portions of the segment rail are both supported at two positions, that is, the position of the seat surface of the bolt inserted into the bolt insertion hole and the position between the abutting portion and the position adjusting screw. Therefore, even if a force is applied to the segment rail through the movement block passing through the joint, the segment rail is prevented from being deformed. In addition, by using the abutting portion and the position adjusting screw, it is possible to prevent an initial positional deviation when the track rail is attached to the base surface.

Further , a pressing force is applied from the position adjusting screw toward the inner peripheral side of the segment rail. The force toward the inner peripheral side opposes the force toward the outer peripheral side of the segment rail from the ball (3) shown in FIG. Therefore, it is possible to prevent the segment rail from shifting to the outer peripheral side when the moving block passes through the joint. If a pressing force is applied from the position adjusting screw toward the outer periphery of the segment rail, the pressing force and the force from the ball (3) shown in FIG. 1 toward the outer periphery of the segment are added together. Becomes easier to deform toward the outer peripheral side.

Further , when the side surface of the end portion of the segment rail is pressed, the end portion of the segment rail can be deformed to the inner peripheral side of the curved segment rail.

According to the second aspect of the present invention, the end portions of the segment rails are supported at two locations between the seat surface of the bolt inserted into the bolt insertion hole, the abutting portion, and the position adjusting screw. . Therefore, even if a force is applied to the segment rail through the movement block passing through the joint, the segment rail is prevented from being deformed. In addition, by using the abutting portion and the position adjusting screw, it is possible to prevent an initial positional deviation when the track rail is attached to the base surface.

  Hereinafter, a motion guide apparatus according to an embodiment of the present invention will be described. FIG. 2 shows a perspective view of the motion guide device. The track rail 7 is configured by connecting segment rails 3a and 3b extending linearly and a segment rail 3c extending curvedly. Ball rolling grooves 4 are formed on the left and right side surfaces of each segment rail 3 as rolling element rolling grooves extending in the longitudinal direction of the segment rail 3. In this embodiment, a total of four ball rolling grooves 4 are formed on each of the left and right side surfaces.

  In order to enable continuous movement from the straight segment rail 3a to the curved segment rail 3c by one kind of moving block 8, as shown in FIG. The horizontal width of the ball rolling groove of the segmented rail is set to be slightly narrower than the horizontal width of the linear segmented rail 3a indicated by a one-dot chain line in the figure. A connecting segment rail extending linearly between the linear segment rail 3a and the curved segment rail 3c so that the lateral width of the rail continuously decreases from the segment rail 3a toward the segment rail 3c. 3b is interposed (see FIG. 2). The connecting segment rail 3b has a width equal to that of the straight segment rail 3a at one end, the width equal to that of the curved segment rail 3c, and the width gradually decreases from one end to the other end. It has become.

  The ball rolling groove 4 of each segment rail 3 is formed in a circular arc shape in cross section. Since the ball 5 rolls on the ball rolling groove 4, the surface of the ball rolling groove 4 is hardened. Each segment rail 3 is formed with a bolt insertion hole 6 for attaching the segment rail 3 to the base surface. As shown in FIG. 4, the bolt insertion hole 6 is formed with a seating surface 6a that engages with the head of the bolt.

  The combination of the linear segment rail 3a and the curved segment rail 3c enables the design of the track rail 7 with a high degree of freedom. FIG. 5 shows a circulation type track rail 7 as an example of the track rail. In this example, two linear segment rails 3a are arranged in parallel, and both ends of the linear segment rail 3a are connected by a semicircular segment rail 3c, so that the entire track rail 7 is formed in a circuit shape. . In addition, the entire shape of the track rail 7 can be designed in various shapes such as a U shape, an L shape, and an S shape.

  As shown in FIG. 2, the moving block 8 includes a steel block main body 9 having a tap hole to which a guide object such as a table is fixed, and a pair of resin provided at both ends in the traveling direction of the block main body 9. End plate 10. The block body 9 is formed with a load ball rolling groove 9a as a load rolling element rolling groove facing the ball rolling groove 4 of the segment rail 3, and a ball return extending in parallel with the load ball rolling groove 9a. A passage 9b is formed. The load ball rolling groove 9a has a semicircular cross section and extends linearly. The ball return passage 9b is composed of a through hole extending linearly. Since the ball 5 also rolls on the load ball rolling groove 9a of the block body 9, the surface of the load ball rolling groove 9a is hardened. These load ball rolling grooves 9 a and ball return passages 9 b are provided in the same number as the ball rolling grooves of the segment rail 3.

  The end plate 10 is formed with a curved, for example, arcuate direction change path 11 that connects the loaded ball rolling groove 9a and the ball return path 9b (see FIG. 6). A plurality of steel balls 5 are arranged as rolling elements in a circuit-like rolling element circulation path constituted by a load ball rolling groove 9a, a direction changing path 11, and a ball return path 9b extending linearly. The ball that has rolled up to one end of the loaded ball rolling groove 9a of the block body 9 is scooped up into the direction change path 11, and after passing through the direction change path 11, is guided to the ball return path 9b. That is, the ball 5 circulates in the rolling element circulation path.

  6 and 7 compare the contact state between the ball 5 and the ball rolling groove 4 in the linear segment rail 3a and the curved segment rail 3c.

  As shown in FIG. 6, when the moving block 8 moves on the linear segment rail 3a, all the balls 5 are substantially equal between the ball rolling groove 4 and the load ball rolling groove 9a. Roll under load. That is, all the balls 5 rolling on the loaded ball rolling groove 9 a come into contact with the ball rolling groove 4. This is because the load ball rolling groove 9a also extends linearly, and the load ball rolling groove 9a and the ball rolling groove 4 are parallel. However, in many cases, crowning is formed at both ends of the loaded ball rolling groove 9a in order to facilitate the entry and exit of the ball 5. In this crowning portion, the load applied to the ball 5 is relaxed.

  On the other hand, as shown in FIG. 7, when the moving block 8 moves on the curved segment rail 3c, the outer peripheral side of the segment rail 3c is at the center of the load ball rolling groove 9a of the moving block 8. The ball 5a contacts the ball rolling groove 4 of the segment rail 3c, and the balls 5b and 5c at both ends of the load ball rolling groove 9a of the moving block 8 are on the ball rolling groove 4 on the inner peripheral side of the segment rail 3c. To touch. That is, the ball row comes into contact with the ball rolling groove 4 at a total of three locations, one on the outer peripheral side of the segment rail 3c and two on the inner peripheral side. This is because the ball rolling groove 4 of the curved segment rail 3c extends in an arc shape and the lateral width is set narrower than the linear segment rail 3a, while the load ball rolling groove 9a of the moving block 8 is a straight line. This is because it extends linearly in accordance with the segment rail 3a. Even if it is only one place on the outer peripheral side, only one ball 5 at the center is not in contact with the ball rolling groove 4, but one ball 5 at the center is the largest load (for example, 100%) So that the balls 5 on both sides receive a smaller load (for example, 60%) and the balls 5 on both sides receive a smaller load (40%) (hereinafter, this is repeated depending on the situation). 5 contacts the ball rolling groove 4. The contact on the inner peripheral side of the segment rail 3c is the same, and only one ball 5 does not contact.

  As described above, in the curved segment rail 3c, the ball 5 contacts the ball rolling groove 4 of the segment rail 3c at three representative positions. Therefore, when the ball passes through the joint of the curved segment rails 3c, the pair of segment rails 3c are displaced at the ends as shown in FIG. The misalignment may occur not only when the moving block 8 passes through the joint, but also at an early stage when the segment rail 3 is attached to the base surface. When the moving block 8 passes through the joint in a state where the joint is displaced, flaking phenomenon occurs in the ball rolling groove 4 of the segment rail 3 at an early stage. In the experiment, 80 to 90% of the flaking phenomenon occurred on the outer peripheral side of the curved segment rail 3c, and 10 to 20% occurred on the inner peripheral side. From this, it is considered that the flaking phenomenon occurs due to the ball 5 coming into contact with the segment rail 3 at three representative positions rather than the initial displacement (because of the initial displacement). If so, the rate at which flaking occurs will be equal on the inner and outer perimeters). In order to prevent misalignment, in this embodiment, as shown in FIG. 8, misalignment prevention means is provided in the vicinity of the joint 13 between the pair of segment rails 3c.

  Here, the misalignment prevention means is unnecessary at the joint between the linear segment rails 3a. This is because, since the balls 5 are in uniform contact with the straight segment rail 3a on the left and right of the segment rail 3a, a force that causes a positional shift does not work. In addition, even with a curved segment rail, the load ball rolling groove of the moving block is formed in a curved shape following the curved segment rail so that the balls are in uniform contact with the left and right sides of the segment rail. Even in the guide device, since the balls are in uniform contact with the left and right of the segment rail, no force that causes a positional shift does not work.

  8 and 9 show a misregistration prevention mechanism 14 as an example of misregistration prevention means. On the base surface near the joint 13 of the pair of segment rails 3c, a pair of butting pins 15 with which the side surfaces of the end portions of the pair of segment rails 3c are butted are disposed. The abutting pin 15 is arranged on the outer peripheral side of the segment rail 3c arranged on the inner peripheral side of the curved segment rail 3c, with the side surface opposite to the end of the pair of segment rails 3c facing the abutting pin 15. A pair of position adjusting screws 16 are provided for pressing. The position adjusting screw 16 is fitted into the female screw 17a of the push plate 17 fixed to the base surface, and can move forward and backward from the push plate 17 toward the segment rail 3c.

  Each of the pair of position adjusting screws 16 is disposed on the joint 13 side from the bolt insertion hole 6 for attaching the segment rail 3c to the base surface. Then, each of the pair of position adjusting screws 16 is disposed on the joint 13 side from the abutment pin 15 so that the end of the segment rail 3c can be deformed toward the inner peripheral side of the segment rail 3c.

  The end of the segment rail 3c is deformed to the inner peripheral side by the position adjusting screw 16 for the following reason. When the force P applied to the segment rail from the position adjusting screw is directed to the inner peripheral side, when the moving block 8 passes through the joint 13, the force from the ball 5 toward the outer peripheral side of the segment rail 3 c (the ball (shown in FIG. 3) to the force F / 2) applied to the rail 2. Therefore, it is possible to prevent the segment rail 3c from shifting to the outer peripheral side when the moving block 8 passes through the joint 13. If the position adjusting screw 16 is pushed toward the outer periphery of the segment rail 3c, the force that the position adjusting screw 16 pushes the segment rail 3 and the force that is applied to the segment rail 3c when the moving block 8 passes through the joint 13 are provided. Therefore, the segment rail 3c is easily deformed to the outer peripheral side. In addition, the circularity of the arc-shaped segment rail 3c is difficult to obtain in processing, and often becomes larger than the designed curvature radius in the vicinity of the joint 13. Since the arc-shaped segment rail 3c is manufactured by grinding the ball rolling groove on the ring-shaped rail and then cutting it, the end of the segment rail 3c tends to spread outward due to the residual stress. By deforming the end of the segment rail 3c to the inner peripheral side by the position adjusting screw 16, it is possible to approach the designed radius of curvature.

  FIG. 10 shows another example of the misregistration prevention mechanism 14. In this example, the abutting pin 15 is disposed on the outer peripheral side of the curved segment rail 3c, and the position adjusting screw 16 is disposed on the inner peripheral side. And the position adjustment screw 16 is arrange | positioned inside the segment rail 3c rather than the butting pin 15 so that the edge part of the segment rail 3c can deform | transform into the inner peripheral side of the segment rail 3c. Since the structure of the abutment pin 15, the position adjusting screw, and the push plate 17 is the same as that of the displacement prevention mechanism 14 shown in FIG. 8, the same reference numerals are given and description thereof is omitted.

  FIG. 11 shows another example of misalignment prevention means. In this example, the misalignment prevention means is composed of end surfaces 19 of the pair of segment rails 3c that are inclined with respect to the center line of the pair of segment rails 3c. The end surface 19 is located in a vertical plane when the base surface is a horizontal plane. As shown in FIG. 12, the inclination angle of the end face (angle θ1 formed between the tangential direction 20 of the segment rail 3c and the end face in FIG. 11) is the ball (1) and the ball (2) or the ball (1) and the ball. It is set smaller than the angle θ2 formed by the line connecting (3).

  By inclining the end surface 19 of the segment rail 3c, when the moving block 8 moves the joint between the pair of segment rails 3c, the force applied to the end portions of the one segment rail 3c is applied to the pair of segment rails 3c that contact each other. It can be transmitted to the end of the other segment rail 3c via the end face 19 of the other. Therefore, it is possible to prevent the position shift of the end portion of the segment rail 3c.

  Further, by making the inclination angle θ1 of the end surface 19 of the segment rail 3c smaller than θ2, the end portion of one segment rail 3c can be used regardless of whether the moving block 8 moves clockwise or counterclockwise. Can be transmitted to the end of the other segment rail 3c. Assuming that the inclination angle θ1 of the end face 19 is larger than θ2, when the moving block 8 moves counterclockwise, the force applied to the end of one segment rail 3c due to the influence of the ball (1) is Cannot be transmitted to the end of the segment rail 3c.

  FIG. 13 shows still another example of the misalignment prevention means. In this example, abutting plates 21 as a pair of abutting portions are disposed on both sides of the joint 13 of the pair of segment rails 3c so as to sandwich the pair of segment rails 3c. The abutting plate 21 is fixed to the base surface with bolts at a certain interval. By pushing the end of the segment rail 3 c into the gap between the pair of butting plates 21, the end of the segment rail 3 c is fitted into the gap between the butting plates 21.

  Below, the attachment method to the base surface of the track rail 7 at the time of using the position shift prevention mechanism 14 shown by FIG. 8 is demonstrated. When the motion guide device of this embodiment is used, as shown in FIG. 14, two track rails 7 are arranged in parallel, and a table is attached to a plurality of moving blocks 8 on the inner and outer track rails 7. There are many. Below, the attachment method to the base surface of such a track rail 7 is demonstrated.

  First, either the outer side or the inner side of the track rail 7 is determined as a reference surface, and positioning pins serving as a reference are fixed on the base surface inside or outside the track rail 7 at a predetermined interval. At the same time as pressing the two track rails 7 against the positioning pins, the distance between the track rails 7 is adjusted, and the two track rails 7 are temporarily fastened to the base surface with bolts.

  Next, the misalignment prevention mechanism shown in FIG. 8 is attached to the joint 13 of the segment rail 3c. As shown in FIG. 8, when the pair of segment rails 3c are temporarily fastened to the base surface, a slight gap W is provided between the end surfaces of the pair of segment rails 3c. Then, when the position adjusting screw 16 is advanced toward the side surface of the segment rail 3 c and the segment rail 3 c is pushed, the opposite side surface of the segment rail 3 c is abutted against the abutting pin 15. When the segment rail 3c is further pushed with the position adjusting screw 16, the end of the segment rail 3c is deformed to the inner peripheral side. As described above, by adjusting the advancement amounts of the position adjusting screws 16 on both sides of the joint 13, it is possible to prevent the positional deviation at the initial stage of attachment. Adjustment of the misalignment of the joint 13 is performed until the resistance disappears when the moving block 8 is actually passed over the joint 13.

  When the passage of the moving block 8 on the joint 13 is no longer a problem, the track rail 7 is temporarily tightened to the final tightening. When the segment rail 3c is finally tightened with a bolt, the segment rail 3c is fixed at the position of the seat surface 6a. From the seat surface 6a to the joint 13, the end of the segment rail 3c is cantilevered at the position of the seat surface 6a. Although the problem of cantilever support can be solved by providing the slip prevention mechanism 14, it is desirable that the bolt insertion hole 6 of the segment rail 3 c is as close as possible to the joint 13.

  The position slip prevention mechanism 14 not only prevents the initial position displacement, but also when the moving block 8 moves the joint 13 and a force that causes the displacement is applied to the joint 13, the segment rail 3 c. Prevents misalignment of the end of the.

  In addition, this invention is not restricted to the said embodiment, In the range which does not change the summary of this invention, it can change variously. For example, instead of the abutting pin 15 of the positional deviation prevention mechanism 14, as shown in FIG. 15, an abutting plate 23 straddling the pair of segment rails 3c may be provided. Further, the misalignment prevention mechanism 14 may be provided not only at the joint 13 of the curved segment rail 3c but also at the joint of the curved segment rail 3c and the straight segment rail 3b. Furthermore, it is also possible to use a roller as a rolling element instead of a ball.

Schematic diagram showing the cause of flaking phenomenon The perspective view of the exercise | movement guide apparatus in one Embodiment of this invention. Comparison diagram showing the width of straight segment rail and curved segment rail Top view of track rail Plan view of circulation type track rail Sectional drawing which shows the contact state of the ball rolling groove and ball of a linear segment rail Sectional view showing the contact state between the ball rolling groove of the curved segment rail and the ball Plan view showing the position shift prevention mechanism Sectional view showing misalignment prevention mechanism Sectional drawing which shows the other example of a position shift prevention mechanism The top view which shows the other example (example which inclined the end surface of the segment rail) of a position shift prevention means Plan view showing the inclination angle of the segment rail The top view which shows the further another example (example which fits the edge part of a segment rail in an abutting board) of a position shift prevention means Plan view showing an example of two track rails arranged in parallel A plan view showing a modification of the misalignment prevention mechanism

Explanation of symbols

3a, 3b ... straight segment rail 3c ... curved segment rail 4 ... ball rolling groove (rolling element rolling surface)
5 ... Ball (rolling element)
6 ... Bolt insertion hole 7 ... Track rail 8 ... Moving block 9a ... Loaded ball rolling groove (loaded rolling element rolling surface)
13 ... Joint 14 ... Position shift prevention mechanism (position shift prevention means)
15 ... Butting pin (butting part)
16 ... Position adjusting screw 19 ... Segment rail end face 21 ... Abutting plate (butting part)

Claims (2)

A track rail having rolling element rolling surfaces on both sides and extending in a curved line, or a track rail configured by connecting a segment rail extending in a curved line and a segment rail extending in a straight line, and the track A moving block that has a rolling element circulation path that includes a load rolling element rolling surface that extends in a straight line, facing the rolling element rolling surfaces on both sides of the rail, and that moves along the track rail, and the moving block A plurality of rolling elements arranged in the circulation path of the rolling element, and on the outer peripheral side of the curved segment rail, the rolling elements at the center of the load rolling element rolling surface of the moving block are The rolling which contacts the rolling element rolling surface of the segment rail and is located at both ends of the load rolling element rolling surface of the moving block on the inner peripheral side of the curved segment rail In There motion guide device in contact with the rolling member rolling run surface of the segment rail,
A pair of abutment portions fixed to a base surface to which the track rail is attached at a joint between a pair of segment rails, and a side surface of an end of the pair of segment rails across the joint, and the pair of segments A misalignment prevention mechanism having a pair of position adjusting screws for pushing the side surface opposite to the side surface of the end portion of the rail toward the abutting portion;
The pair of position adjusting screws and the pair of abutting portions are respectively disposed on the joint side with respect to a bolt insertion hole disposed on the most joint side for attaching the segment rail to the base surface, and The pair of position adjusting screws or the pair of abutting portions arranged on the outer peripheral side of the segment rail is more than the pair of abutting portions or the pair of position adjusting screws arranged on the inner peripheral side of the segment rail. The motion guide device is arranged on the joint side. A track rail having rolling element rolling surfaces on both sides and extending in a curved line, or a track rail configured by connecting a segment rail extending in a curved line and a segment rail extending in a straight line, and the track A moving block that has a rolling element circulation path that includes a load rolling element rolling surface that extends in a straight line , facing the rolling element rolling surfaces on both sides of the rail, and that moves along the track rail, and the moving block A plurality of rolling elements arranged in the circulation path of the rolling element, and on the outer peripheral side of the curved segment rail, the rolling elements at the center of the load rolling element rolling surface of the moving block are The rolling which contacts the rolling element rolling surface of the segment rail and is located at both ends of the load rolling element rolling surface of the moving block on the inner peripheral side of the curved segment rail There a displacement prevention mechanism used in the motion guide device in contact with the rolling member rolling run surface of the segment rail,
A pair of abutting portions fixed to a base surface to which the track rail is attached at a joint between a pair of segment rails, and a side surface of an end of the pair of segment rails sandwiching the joint;
A pair of position adjusting screws that push the side surface opposite to the side surface of the end portion of the pair of segment rails toward the abutting portion;
Each of the pair of position adjusting screws and the pair of butting portions is disposed on the joint side with respect to a mounting bolt insertion hole disposed on the most joint side for attaching the segment rail to the base surface, and The pair of position adjusting screws or the pair of abutting portions arranged on the outer peripheral side of the segment rail is more than the pair of abutting portions or the pair of position adjusting screws arranged on the inner peripheral side of the segment rail. A misalignment prevention mechanism, wherein the misalignment prevention mechanism is disposed on the joint side.

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