TWI608893B - Force increasing mechanism of locking device - Google Patents

Description

Force-increasing mechanism of the locking device

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a force-increasing mechanism for a locking device for stopping rotation or positioning of an indexing rotary turntable, and more particularly to a force-increasing mechanism for utilizing a ball.

For example, the locking mechanism in the circular table device described in Patent Document 1 is a locking mechanism such as an indexing device. According to this technique, a circular table device is disclosed which has a workpiece mounting portion at one end in the axial direction of the rotating shaft, a rotating shaft with a driving mechanism, and a rotating shaft fixed at a predetermined rotation by a locking mechanism. The angled circular table device has a locking mechanism including: a brake disc integrally provided with the rotating shaft, a chuck member that clamps the brake disc, and a hydraulic piston that pressurizes the chuck member from the axial direction, Further, a force increasing mechanism is interposed between the hydraulic piston and the chuck member, and the boosting mechanism is constituted by a spherical body and a flange surface movable in the axial direction and the radial direction. The flange surface is a tapered flange surface, and a plurality of spheres are disposed entirely around the tapered surface.

Patent Document 1: Japanese Patent Publication No. 2002-18679.

However, the force-increasing mechanism using the ball described in Patent Document 1 has a flange surface which is a tapered flange surface, that is, has a flat inclined surface, so that the contact between the ball and the flange surface is point contact. Therefore, the frictional force is insufficient, and it cannot be pushed with a large load, and the clamping force may not be sufficient.

Accordingly, it is an object of the present invention to provide a force-increasing mechanism for a locking device that utilizes a sufficient clamping force to increase the rotation or positioning of the rotating table by increasing the friction coefficient and the load capacity. .

Therefore, the force increasing mechanism of the locking device of the present invention includes: a moving member disposed on an outer peripheral side of the rotating shaft of the rotating table, movable in an axial direction of the rotating shaft, and having a first guiding surface capable of supporting the ball; The fixed side member is provided on a side of the fixed frame that supports the rotating shaft, and has a second guiding surface that receives the spherical body together with the first guiding surface; and the pressing member is movable in the axial direction of the rotating shaft and has a third guiding surface that receives the spherical body guided by the first guiding surface and the second guiding surface along with the movement of the moving member, and is pushed toward the moving direction of the moving member through the spherical body The pressing is performed to restrict the rotation of the rotating shaft or the positioning of the stopping position, and at least one of the first to third guiding surfaces is formed into a groove having a curved shape in line contact with the surface of the spherical body.

In one of the main embodiments, the pressing member is fixed to one of the rotating shaft side or the fixed frame side, and the locking surface is formed on the rotating shaft side or the fixed frame side. In addition to the other, the pressed member is pressed against the locking surface by the movement of the pressing member to restrict the rotation of the rotating shaft.

In another main embodiment, the rotating side engaging portion is provided on the rotating table, the fixed side engaging portion is provided on the fixed frame, and the pressing side engaging portion is provided on the pressing member. Engaged in the rotation side engagement portion and the fixed side engagement portion, and the pressing side engagement portion is simultaneously engaged with the rotation side engagement portion and the fixed side card by movement of the pressing member The joint is positioned to stop the rotation of the aforementioned rotating shaft. In another aspect, the rotation side engagement portion and the fixed side engagement portion are engaged with the pressing side engagement portion, and the concave and convex engagement is performed.

In still another aspect, all of the first to third guiding surfaces are formed into a curved groove having a surface line contact with the surface of the spherical body. In still another aspect, the sphere is disposed to be apart from the adjacent sphere. The above and other objects, features and advantages of the present invention will become apparent from

According to the present invention, in a boosting mechanism using a locking device for a ball, a moving member is provided on an outer peripheral side of a rotating shaft of the rotating table, and is movable in an axial direction of the rotating shaft. And having a first guiding surface that can bear the spherical body; the fixed side member is disposed on the side of the fixing frame supporting the rotating shaft, has a second guiding surface that bears the spherical body together with the first guiding surface; and the pressing member can Moving in the axial direction of the rotating shaft, and having a third guiding surface that receives the spherical body guided by the first guiding surface and the second guiding surface as the moving member moves, and transmits The spherical body is pressed toward a moving direction of the moving member to perform positioning of a rotation or a stop position of the rotating shaft, and at least one of the first to third guiding surfaces is formed to have a spherical body The surface is made into a groove of a curved surface in line contact. Therefore, the friction coefficient can be increased, and the load capacity can be increased by the contact of the ball with the guide surface line, so that the pressing force can be pushed with a large pressing force, and the rotation of the rotating shaft can be surely restricted or the positioning of the rotation stop can be performed.

Hereinafter, the best mode for carrying out the invention will be described in detail based on the embodiments.

First, a first embodiment of the present invention will be described with reference to Figs. 1 to 4 . Fig. 1 is a cross-sectional view showing the overall configuration of a rotary table device of the present embodiment. Fig. 2 is a main cross-sectional view showing the action of the boosting mechanism of the embodiment, (A) showing the state before the lock, and (B) showing the state after the lock. Fig. 3(A) is a cross-sectional view taken along the line #B-#B in Fig. 2(A) and seen from the direction of the arrow, and (B) to (D) are diagrams showing the shape of the R groove of the guide surface, ( B) is a cross-sectional view showing the PA portion in the above (A), (C) is a cross-sectional view taken along the line #C-#C as seen from the arrow FC direction, and (D) is viewed from the arrow FD direction along the # A cross-sectional view of the C-#C line after cutting. Fig. 4 shows an application example of the present invention, which will be described later.

As shown in Fig. 1, the rotary table device 10 of the present embodiment is supported on a fixed frame 12 by a known bearing 20, 22, 24, 26 or the like so that the rotary shaft 14 is rotatable. One end side (the upper end side in the example of Fig. 1) of the rotating shaft 14 has a rotary table 16 fixed by a bolt 18 or the like. The rotary table 16 functions as, for example, a workpiece mounting portion (not shown). The rotating shaft 14 is driven by a motor or the like (not shown) provided on the other end side (the lower end side in the example of Fig. 1). Alternatively, a worm wheel (not shown) may be provided at an appropriate position of the rotating shaft 14, and a turret shaft engaged with the worm wheel may be coupled to a motor (not shown) to drive the rotating shaft 14. A lock device 28 including the boosting mechanism 30 is provided on the lower side of the turntable device 10.

The lock device 28 is configured to hold the rotating shaft 14 at a predetermined rotation stop position, and is composed of a lock disk 90, a pressing member 70, a locking surface 92, a moving member 32, a boosting mechanism 30, and the like. The locking disc 90 is fixed to the rotating shaft 14 by a fixing washer 94. The pressing member 70 and the locking surface 92 are for clamping the locking disc 90 from both sides, and the moving member 32 is for moving the pressing member. 70. The moving mechanism is configured to move the moving member 32 forward and backward in the axial direction of the rotating shaft 14, and the boosting mechanism 30 transmits the moving member 32 to the pressing member 70. In the present embodiment, the aforementioned locking surface 92 is formed on the side of the aforementioned fixed frame 12.

The booster mechanism 30 is composed of a moving member 32, a plurality of balls 50, a receiving member 60 (corresponding to a fixed side member), and the pressing member 70. The moving member 32 is provided on the outer peripheral side of the rotating shaft 14, and the bottom surface of the moving member 32 is formed with a tapered surface. An air chamber 34 is formed between the bottom surface of the moving member 32 and the bottom surface of the fixed frame 12. Further, a passage 36 communicating with the air chamber 34 is formed below the side surface of the fixed frame 12. The passage 36 is provided with an air supply and exhaust device 38 for supplying and exhausting air to the outside of the fixed frame 12. When the air supply and exhaust device 38 sends air to the air chamber 34, the moving member 32 rises (the state of FIG. 2(B)), and conversely, the air member 34 is exhausted, and the moving member 32 descends (FIG. 2). (A) status).

The moving member 32 is fixed with a press-fitting portion 40 formed with a first guiding surface 44 for receiving the spherical body 50, and the press-fitting portion 40 is fixed by a bolt 42 or the like. As shown in FIGS. 2(A) and 2(B), the guide surface 44 is formed in a curved groove (R groove) in line with the spherical body 50 in the axial direction of the rotating shaft 14 (see FIG. 3 (A). )~(C)). When the guide surface 44 is viewed from the axial direction cross section of the rotary shaft 14, the width is wider as it goes upward and narrower as it goes downward. By providing such inclination, the spherical body 50 can be pressed between the receiving member 60 and the pressing member 70 which will be described later. Further, a spring 46 is provided on the inner peripheral side of the moving member 32. One end side of the spring 46 is housed in a hole formed in the hole of the moving member 32, and the other end side abuts against the fixed side member 80 fixed to the fixed frame 12 side by a suitable fixing member 86. The moving member 32 is biased downward by the aforementioned spring 46.

In the illustrated example, the receiving member 60 is provided on the outer peripheral side of the rotating shaft 14 than the moving member 32, and receives the spherical body 50 together with the guiding surface 44 of the press-fitting portion 40 of the moving member 32. The second guiding surface 62 of the aforementioned spherical body 50 is received. The guide surface 62 is formed in the radial direction of the rotary shaft 14 as shown in Figs. 3(A) and (B), and is a curved groove (R groove) which is in line contact with the spherical body 50 as shown in Fig. 3(D). . When the guide surface 60 is viewed from the axial direction of the rotating shaft 14, the slope is higher as the inner peripheral side is lower and the outer peripheral side is higher. By providing such a slope, when the spherical body 50 is pressed between the receiving member 60 and the pressing member 70, the pressing member 70 can be pushed upward as the spherical body 50 is pressed toward the outer peripheral side. Push.

The pressing member 70 is movable in the axial direction of the rotating shaft 14 and has a third guiding surface 72 that is guided by the aforementioned guiding surfaces 44, 62 by the movement of the moving member 32. The sphere 50. 2 (A) and (B), the third guide surface 72 is formed in the radial direction of the rotating shaft 14, and as shown in FIG. 3(D), is in a curved shape in line contact with the spherical body 50. Ditch (R groove). When the guide surface 72 is viewed from the axial direction cross section of the rotating shaft 14, the inner peripheral side is higher, and the outer peripheral side is lower. By providing such a slope, when the spherical body 50 is pressed between the receiving member 60 and the outer peripheral side of the spherical body 50, the pressing member 70 can be pressed upward.

Further, the inner peripheral side of the pressing member 70 is provided with a protruding portion 74 that protrudes toward the inner peripheral side of the guiding surface 72, and the upper surface of the protruding portion 74 supports one end of the spring 78. The other end side of the spring 78 is a concave receiving portion 84 housed in the fixed side member 80. Therefore, the pressing member 70 is biased downward by the spring 78.

Next, the action of this embodiment will be described with reference to Fig. 2 . Figure 2 (A) shows the unclamp state. In this state, the air chamber 34 is not supplied with air, and the moving member 32 is biased downward by the spring 46, and the pressing member 70 is also biased downward by the spring 78. Therefore, the aforementioned locking disk 90 is not caught by the upper surface of the pressing member 70 and the aforementioned locking surface 92, and there is a slight gap in the members. That is, the locking device 28 is released, and by rotating the rotating shaft 14 in a state in which the driving mechanism is not shown, the rotating shaft 14 rotates and the rotating table 16 also rotates, thereby changing the upper portion of the rotating table not shown. The angle of rotation of the workpiece.

As described above, after the rotary table 16 is rotated by a predetermined angle, if the rotary shaft 14 is to be locked, as shown in FIG. 2(B), the air supply means 38 feeds the air into the air chamber via the passage 36. 34. Thereby, the potential energy applied to the moving member 32 by the spring 46 is moved to move the moving member 32 in the axial direction of the rotating shaft 14 (the above example is shown). When the moving member 32 ascends, the ball 50 held by the guiding surface 44 (R groove) of the press-fitting portion 40 of the moving member 32 is pushed up by the slope of the guiding surface 44 and pressed into the receiving member 60. The guide surface 62 (R groove) is between the guide surface 72 (R groove) of the pressing member 70. At this time, the shape of the groove formed by the guide surfaces 62 and 70 is narrower toward the outer circumference, so that the pressing member 70 is pushed upward through the spherical body 50. In this manner, the pressing member 70 presses the lock disk 90 toward the locking surface 92 on the side of the fixed frame 12 to sandwich the holding lock disk 90.

When the locking operation as described above is performed, the first guiding surface 44, the second guiding surface 62, and the third guiding surface 72 that receive the spherical body 50 are curved grooves (R grooves) having line contact with the surface of the spherical body 50. . That is, since the spherical body 50 is held by the R groove, friction can be generated on both the pressing side and the receiving side. Therefore, the surface pressure can be calculated by using twice the friction coefficient, and the pressing can be performed with a large load. When the locked state is to be released, the air is discharged from the air chamber 34 by the air supply and exhaust mechanism 38, the moving member 32 is lowered by the potential energy imparted by the spring 46, and the pressing member 70 is also subjected to the potential energy imparted by the spring 78. When it is lowered, the pinching of the locking surface 90 by the locking surface 92 and the pressing member 70 is released. Further, the spherical body 50 is returned to the side of the rotating shaft 14 as shown in Fig. 2(A).

As described above, according to the first embodiment, the boosting mechanism 30 of the locking device 28 is configured to include the moving member 32, which is provided on the outer peripheral side of the rotary shaft 14 of the rotary table 16, and is movable in the axial direction thereof and is capable of withstanding a first guiding surface 44 of the ball 50; a receiving member 60 provided on the side of the fixed frame 12, having a second guiding surface 62 that receives the spherical body 50 together with the guiding surface 44; and a pressing member 70 on the rotating shaft 14 Moving in the axial direction and having a third guiding surface 72 that receives the aforementioned spherical body 50 guided by the first and second guiding surfaces 44, 62 as the moving member 32 moves. Further, the ball 50 is pushed toward the moving direction of the moving member 32. By pressing the locking disk 90 fixed to the side of the rotating shaft 14 to the locking surface 92 of the fixed frame side 14 by the pressing member 70, the following effects can be obtained:

(1) By forming the guide faces 44, 62, and 72 that receive the spherical body into a curved R-shaped groove that is in line contact with the surface of the spherical body 50, a high surface pressure can be calculated, and the load capacity can be increased. While the pressing member 70 is pushed with a large load, the locking disk 90 can be held between the locking surface 92 to surely restrict the rotation.

(2) By forming the guide surfaces 44, 62, and 72 that receive the spherical body into a curved R-shaped groove that is in line contact with the surface of the spherical body 50, friction can be generated on both the press-fitting side and the receiving side of the spherical body 50. The surface pressure can be calculated using a coefficient of friction of 2 times compared to the point of contact with the prior art.

(3) The position of the spherical body 50 can be fixed by holding the spherical body 50 by the R-groove guiding faces 44, 62, and 72. Therefore, it is not necessary to integrally provide the spherical body 50 around the rotating shaft 14, as long as the necessary number (three in the present embodiment) is provided.

<Application Example> FIG. 4 shows an application example of the present embodiment. As described above, in the present embodiment, all of the guide surfaces 44, 62, and 72 that receive the spherical body 50 are formed as R grooves. Therefore, it is not necessary to provide the spherical body 50 around the rotating shaft 14, and it is only necessary to provide a necessary number. Therefore, it is possible to mount a stroke sensor or the like using a portion where the sphere 50 is not disposed. For example, in the example shown in FIG. 4, an example in which the stroke sensor 100 is provided on the lower side of the fixed frame 12 is shown. As shown in the figure, the press-fitting portion 40 of the moving member 32 is formed with a tapered surface 102 as shown in Fig. 4 at a portion other than the R-groove guiding surface 44 of the spherical body 50. Further, a piston 104 is attached to the side of the fixed frame 12, and the head portion 106 of the piston 104 is in contact with the tapered surface 102, and is attached to the cylinder 109 penetrating the fixed frame 12 so as to be retractable.

A spring 108 is provided on the outer circumference of the piston 104, and one end of the spring 108 abuts against the head portion 106, and the other end side abuts against the rear end portion 110 of the cylinder 109. The piston 104 is inserted into the hollow portion of the cylinder 109 in a state in which the head portion 106 and the spring 108 are provided, and the rear end portion 110 is attached to the fixed frame 12 by bolts 112 or the like. The rear end side of the piston 104 has two convex portions 114 and 116 which are provided at the same position in the radial direction of the rotary shaft 14. The sensors 118 and 120 that detect the convex portions 114 and 116, respectively, are disposed in the forward and backward directions of the piston 104. As shown in FIG. 4, in a state where the moving member 32 is raised, the head portion 106 retreats along the tapered surface 102, and the outer sensor 120 detects the convex portion 116. On the other hand, in a state where the moving member 32 is lowered, the head portion 106 that is biased by the spring 108 travels along the tapered surface 102 toward the rotating shaft 14 side, and the inner side sensor 118 detects the convex portion 114. As such, the stroke state of the moving member 32 can be sensed by the side detection results of the sensors 118, 120. Thus, by fixing the spherical body 50 with the R groove, the stroke sensor can be incorporated in the present invention as compared with the case where the pressure sensor is provided when the spherical body is integrally provided on the outer circumference of the rotating shaft as in the background art.

Next, a second embodiment of the present invention will be described with reference to Figs. 5 to 7 . The same or corresponding components as those of the above-described first embodiment are denoted by the same reference numerals (the same applies to the following embodiments). Fig. 5 is a main sectional view showing a state before the rotary table device of the present embodiment is locked. Fig. 6 is a main sectional view showing a state after locking. Fig. 7 is a view showing the present embodiment, (A) is a plan view schematically showing a guide groove and a sphere, and (B) is a cross-sectional view taken along the line #D-#D in Fig. 5 as seen from the direction of the arrow. (C) is a view of the above (B) as seen from the direction of the arrow F7.

In the first embodiment, the moving member 32 having the R-groove-shaped guiding surface, the receiving member 60, and the pressing member 70 are used to constitute the boosting mechanism, and the pressing member 70 holds the locking disc 90 in the locking state. The faces 92 are limited in rotation. On the other hand, in the present embodiment, the configuration of the boosting mechanism is basically the same, but the positioning of the rotation stop can be accurately performed. As shown in FIG. 5 and FIG. 6, the turntable device 200 of the present embodiment is supported by a bearing or the like so as to be rotatable by a bearing or the like, and the rotary table 16 has a rotary table 16 on one end side thereof, such as a bolt 18 or the like. Fixed. As in the first embodiment, the rotation mechanism of the rotary shaft 14 can use various known rotary drive mechanisms. A locking device 202 having a boosting mechanism 220 is disposed below the rotating table 16.

The aforementioned locking device 202 is for positioning the aforementioned rotating shaft 14 at a predetermined rotation stop position. The locking device 202 is composed of an engaging claw 206 provided at a distal end of the extending portion 204 extending from the rotating table 16 in the axial direction of the rotating shaft 14, and an engaging claw 210 disposed on the rotating table 16 The lower side is formed on the fixed side ring 208 and the fixed side ring 208 is fixed to the side of the fixed frame 12 and formed in a substantially annular shape; the engaging groove 256 is formed in the pressing member that moves in the axial direction of the rotating shaft 14 250; and moving member 222 for moving the pressing member 250. The boosting mechanism 220 transmits the movement of the moving member 222 to the pressing member 250.

The engaging claws 206 provided on the side of the rotating table 16 and the engaging claws 210 formed on the fixed side ring 208 are plural (for example, 4) centering on the rotating shaft 14 as shown in Fig. 7(B). Only) formed into a radial shape. Further, the engagement groove 256 of the pressing member 250 has a length sufficient to simultaneously engage the engagement claw 206 on the rotation side and the engagement claw 210 on the fixed side, and is formed in a plurality of radial shapes around the rotation shaft 14. As will be described later, by the movement of the pressing member 250, the engaging claws 206 on the rotating side and the engaging claws 210 on the fixed side can be simultaneously engaged with the engaging groove 256 (in this embodiment, the concave and convex portions are concave and convex in this embodiment). The fitting is performed so that the rotation of the rotating shaft 14 can be accurately stopped.

Next, the boosting mechanism 220 is composed of a moving member 222, a plurality of balls 50, a receiving member 240, and the pressing member 250. The moving member 222 is provided on the outer peripheral side of the rotating shaft 14, and an air chamber 224 is provided between the bottom surface of the moving member 222 and the fixed frame 12 side. The air chamber 224 is supplied and exhausted by the air supply and exhaust unit 226, and the moving member 222 is caused to travel in the axial direction of the rotary shaft 14.

The moving member 222 is formed with a first guiding surface 230 for receiving the aforementioned spherical body 50. The guide surface 230 is formed in the axial direction of the rotating shaft 14, and is formed into a curved groove (R groove) which is in line contact with the spherical body 50 in the same manner as the guiding surface 44 of the first embodiment. Further, when the guide surface 230 is viewed from the axial direction of the rotary shaft 14, the curved portion 234 is formed downward, and the straight portion 236 is inclined upward. By providing such a curved portion 234 and the straight portion 236, the speed at which the spherical body 50 is pushed into the receiving member 240 side to be described later changes, and the timing of pressing the pressing member 250 can be adjusted. Further, the moving member 222 is provided with a spring 238 at the outer periphery. One end side of the spring 238 is housed in a hole formed in a hole (not shown) of the moving member 222, and the other end side abuts on the side of the fixed frame 12. The moving member 222 is biased downward by the spring 238.

Next, in the illustrated example, the receiving member 240 is provided between the moving member 222 and the rotating shaft 14, and receives the spherical body 50 in common with the guiding surface 230 of the moving member 222, and is formed to receive the spherical body 50. Two guiding faces 242. As shown in FIGS. 5 and 6, the guide surface 242 is formed in the radial direction of the rotary shaft 14, and is formed into a curved shape in contact with the line of the spherical body 50 as in the guide surface 62 of the receiving member 60 of the first embodiment. Ditch (R groove). Further, when the guide surface 242 is viewed from the axial direction of the rotary shaft 14, it is provided with a slope which is lower toward the inner peripheral side and lower toward the outer peripheral side. By providing such a slope, when the spherical body 50 is pressed between the receiving member 240 and the pressing member 250, the pressing member 250 can be pushed upward as the spherical body 50 is pressed toward the inner peripheral side. Push.

The pressing member 250 is movable in the axial direction of the rotating shaft 14 and has a third guiding surface 252 that is received by the guiding surfaces 230, 242 by the movement of the moving member 222. Guided sphere 50. As shown in FIGS. 5 and 6, the third guide surface 252 is formed in the radial direction of the rotating shaft 14, and is lined with the spherical body 50 in the same manner as the guiding surface 72 of the pressing member 70 of the first embodiment. Contacted curved groove (R groove). Further, when the guide surface 252 is viewed from the axial direction of the rotary shaft 14, it is horizontal. Further, at one end of the pressing member 250 on the outer circumference, one end of the spring 254 is housed in a hole (not shown). The other end side of the spring 254 abuts on a portion where the fixed side ring 208 is not formed with the engaging claw 210. Therefore, the pressing member 250 is biased downward by the spring 254.

In the present embodiment, the stroke sensor 260 can be provided in the same manner as in the first embodiment described above. As shown in FIGS. 5 and 6, the fixed frame 12 is formed with a groove 262 along the moving direction of the moving member 222. Further, a cylinder 264 is provided, and one end side of the cylinder 264 is fixed to the moving member 222, and the other end side is protruded outside the fixing frame 12. The end portion of the cylinder 264 is provided with two convex portions 266 and 268 which are provided at the same position in the radial direction of the rotary shaft 14. On the other hand, the sensors 270 and 272 that sense the convex portions 266 and 268 are disposed at positions shifted from the front end of the cylinder block 264 to the outside in the vertical direction. As shown in FIG. 5, in a state where the moving member 222 is lowered, the cylinder 264 is also lowered together, and the convex portion 268 on the lower side is sensed by the sensor 272. Further, as shown in FIG. 6, in a state where the moving member 32 is raised, the cylinder 264 is also raised together, and the upper convex portion 266 is sensed by the sensor 270. As such, the stroke state of the moving member 222 can be sensed by the detection results of the sensors 270, 272.

Next, the action of this embodiment will be described with reference to Figs. 5 and 6 . The unlocked state is shown in FIG. In this state, the air chamber 224 is not supplied with air, and the moving member 222 is biased downward by the spring 238, and the pressing member 250 is also biased downward by the spring 254. Therefore, the engagement groove 256 does not engage the engagement claws 206 and 210, and a small gap 258 exists in the members (see FIG. 7(C)). That is, the locking device 202 is released, and by rotating the rotating shaft 14 in a state in which the driving mechanism is not shown, the rotating shaft 14 rotates and the rotating table 16 also rotates, thereby changing the upper table of the rotating table 16 The angle of rotation of the workpiece.

As described above, after the rotary table 16 is rotated by a predetermined angle, if the rotary shaft 14 is to be locked, air is supplied to the air chamber 224 by the air supply and exhaust device 226 as shown in FIG. Thereby, the potential energy applied to the moving member 222 by the spring 238 is counteracted, and the moving member 222 is moved in the axial direction of the rotating shaft 14 (the above example is shown). When the moving member 222 is raised, the ball 50 held by the R groove (guide surface 230) of the moving member 222 is pushed up by the curved portion 234 and the straight portion 236 of the guiding surface 230, and is pressed into the receiving member. The guide surface 242 (R groove) of the 240 is between the guide surface 252 (R groove) of the pressing member 250. At this time, since the groove shape formed by the guide surfaces 242 and 252 is narrower toward the inner circumference, the pressing member 250 is pushed up via the spherical body 50. In this manner, the engaging groove 256 of the pressing member 250 simultaneously engages the engaging claw 206 on the rotating shaft 14 side and the engaging claw 210 on the fixed side, so that the rotation of the rotating shaft 14 can be stopped at a predetermined position.

When the locking operation as described above is performed, the first guiding surface 230, the second guiding surface 242, and the third guiding surface 252 that receive the spherical body 50 are grooves having a curved shape that is in line contact with the surface of the spherical body 50. That is, since the spherical body 50 is held by the R groove, friction can be generated on both the pressing side and the receiving side. Therefore, the surface pressure can be calculated using a friction coefficient twice, and the pressing can be performed with a large load. When the locked state is released, the air is discharged from the air chamber 224 by the air supply and exhaust mechanism 226, the moving member 222 is lowered by the potential energy imparted by the spring 238, and the pressing member 250 is also subjected to the potential energy imparted by the spring 254. When it is lowered, the engagement groove 256 of the pressing member 250 and the engaging claws 206 and 210 are released, and the locking state is released. Further, the spherical body 50 is moved in a direction away from the rotating shaft 14 as shown in FIG. 5 described above.

As described above, according to the second embodiment, the boosting mechanism 220 of the locking device 202 is configured to include a moving member 222 which is provided on the outer peripheral side of the rotary shaft 14 of the rotary table 16 and is movable in the axial direction thereof and is capable of withstanding a first guiding surface 230 of the ball 50; a receiving member 240 provided on the side of the fixed frame 12, having a second guiding surface 242 that bears the spherical body 50 together with the guiding surface 230; and a pressing member 250 on the rotating shaft 14 Moving in the axial direction and having a third guiding surface 252 that receives the aforementioned spherical body 50 guided by the first and second guiding surfaces 230, 242 as the moving member 222 moves. Further, the ball 50 is pushed toward the moving direction of the moving member 222. When the pressing member 250 is pressed, the engaging groove 256 formed in the pressing member 250 is configured to simultaneously engage the engaging claw 206 on the rotating side and the engaging claw 210 on the fixed side, so that the engaging claw 210 can be surely The positioning of the rotation stop of the rotary shaft 14 is performed. Further, the effect of forming the three guide faces of the spherical body 50 into the R groove shape is the same as that of the first embodiment.

Further, the present invention is not limited to the above embodiments, and various modifications can be added without departing from the spirit and scope of the invention. For example, include the following:

(1) The shape and size shown in the foregoing embodiments are examples, and may be appropriately changed as needed. Regarding the material, various well-known materials can also be used within the range in which the same effects are achieved.

(2) In the foregoing embodiment, three balls 50 are provided, but this is only one example, and the number of the balls 50 can be appropriately increased or decreased within a range in which the same effect is achieved.

(3) In the above embodiment, all of the guide faces of the moving member, the receiving member, and the pressing member are formed as R grooves having a curved surface in line contact with the surface of the spherical body 50, but even if only one of the guiding faces is formed as The R groove can also calculate a higher surface pressure than when it is in contact with prior art points.

(4) In the foregoing embodiment, the drive mechanism using the worm wheel is used as the drive mechanism of the rotary shaft 14, and the present invention is not limited thereto, and various known rotary drive mechanisms within the range in which the same effects are achieved can be applied.

(5) In the foregoing embodiment, the air pressure is used as a means for moving the moving member, but this is only one example, and a known mechanism using other fluids may be employed.

(6) The stroke sensor 110 shown in the application example of the first embodiment, or the stroke sensor 260 shown in the second embodiment is merely an example, and various known sensors (pressure sensors, shifts) may be provided. Bit sensor, etc.).

(7) In the first embodiment, the locking disc is fixed to the side of the rotating shaft 14, but this is only one example, and the locking disc may be fixed to the side of the fixed frame 12.

(8) In the second embodiment, the engagement claws 206 on the rotation side and the engagement claws 210 on the fixed side are formed in a convex shape, and the engagement groove 250 is a concave engagement groove 256 on the side of the pressing member 250, but this is only one example. It can also be reversed. Further, the unevenness on the fixed side and the rotating side may be reversed, and the shape of the engaging portion on the pressing side may be correspondingly fitted thereto. Further, in the second embodiment, the uneven fitting is exemplified, and other engaging forms may be used as long as the same effect is exhibited.

(9) The booster mechanism of the present invention can be applied to various machine tools having a rotary table.

According to the invention, the moving member is provided on the outer peripheral side of the rotating shaft of the rotary table, is movable in the axial direction of the rotating shaft, and has a first guiding surface that can withstand the ball; the fixed side member is provided to support the foregoing a fixing frame side of the rotating shaft, having a second guiding surface that receives the spherical body together with the first guiding surface; and a pressing member movable in an axial direction of the rotating shaft and having a third guiding surface, the third The guide surface receives the spherical body guided by the first guide surface and the second guide surface in accordance with the movement of the moving member, and is urged toward the moving direction of the moving member through the spherical body to perform the rotation axis At least one of the first to third guiding surfaces is formed to have a curved shape groove in line contact with the surface of the spherical body. Therefore, the friction coefficient can be increased, and the load capacity can be increased by the contact of the ball with the guide surface line, so that the pressing force can be pushed with a large pressing force, and the rotation of the rotating shaft can be surely restricted or the positioning of the rotation stop can be performed. Therefore, it can be applied to the use of the boosting mechanism using the locking device of the ball.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

10‧‧‧Rotary table device
12‧‧‧Fixed frame
14‧‧‧Rotary axis
16‧‧‧Rotating table
18‧‧‧ bolt
20‧‧‧ bearing
22‧‧‧ Bearing
24‧‧‧ bearing
26‧‧‧ Bearing
28‧‧‧Locking device
30‧‧‧Enhancement Agency
32‧‧‧moving components
34‧‧ Air Chamber
36‧‧‧ channel
38‧‧‧Exhaust and exhaust
40‧‧‧Indentation Department
42‧‧‧ bolt
44‧‧‧Guiding surface (R groove)
46‧‧‧ Spring
50‧‧‧ sphere
60‧‧‧Responsible components
62‧‧‧ Guide surface (R groove)
70‧‧‧ Pushing members
72‧‧‧Guiding surface (R groove)
74‧‧‧Protruding
78‧‧‧ Spring
80‧‧‧Fixed side members
82‧‧‧ Flat section
84‧‧‧ Housing Department
86‧‧‧Fixed parts
90‧‧‧Locking disc
92‧‧‧Locking surface
94‧‧‧Fixed washers
100‧‧‧Travel Sensor
102‧‧‧ Cone
104‧‧‧Piston
106‧‧‧ head
108‧‧‧ Spring
109‧‧‧Cylinder block
110‧‧‧ Back end
112‧‧‧ bolts
114‧‧‧ convex
116‧‧‧ convex
118‧‧‧ Sensor
120‧‧‧ sensor
200‧‧‧Rotary table device
202‧‧‧Locking device
204‧‧‧Extension
206‧‧‧Card claws
208‧‧‧Fixed side ring
210‧‧‧Card claws
220‧‧‧Enhancement Agency
222‧‧‧moving components
224‧‧ Air Room
226‧‧‧Air supply and exhaust
230‧‧‧ Guide surface (R groove)
234‧‧‧ Curve Department
236‧‧‧ Straight line
238 ‧ ‧ spring
239‧‧‧Protruding
240‧‧‧Responsible components
242‧‧‧Guiding surface (R groove)
250‧‧‧ Pushing members
252‧‧‧Guiding surface (R groove)
254‧‧ ‧ spring
256‧‧‧Kap
258‧‧‧ gap
260‧‧‧Travel sensor
262‧‧‧ditch
264‧‧‧ cylinder
266‧‧‧ convex
268‧‧‧ convex
270‧‧‧ sensor
272‧‧‧ sensor

Other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a cross-sectional view showing the overall configuration of the rotary table device according to the first embodiment of the present invention. The main cross-sectional view of the action of the force mechanism, (A) is a view showing the state before the lock, (B) is a view showing the state after the lock; FIG. 3 is a view showing the first embodiment, and (A) is the aforementioned FIG. (A) is a cross-sectional view, (B) to (D) are views showing the shape of the R groove of the guide surface in the present embodiment; Fig. 4 is a view showing an application example of the first embodiment; and Fig. 5 is a view showing the second embodiment of the present invention. Main cross-sectional view of the state before locking; FIG. 6 is a cross-sectional view showing the state after the locking of the foregoing embodiment 2; and FIG. 7 is a view showing the second embodiment, and (A) is a view schematically showing the guiding groove and the sphere. (B) is a cross-sectional view taken along the line #D-#D in FIG. 5 and seen from the direction of the arrow, and (C) is a view of the above (B) as seen from the direction of the arrow F7.

10‧‧‧Rotary table device

12‧‧‧Fixed frame

14‧‧‧Rotary axis

16‧‧‧Rotating table

18‧‧‧ bolt

32‧‧‧moving components

34‧‧ Air Chamber

36‧‧‧ channel

38‧‧‧Exhaust and exhaust

46‧‧‧ Spring

20‧‧‧ bearing

22‧‧‧ Bearing

24‧‧‧ bearing

26‧‧‧ Bearing

28‧‧‧Locking device

30‧‧‧Enhancement Agency

50‧‧‧ sphere

60‧‧‧Responsible components

70‧‧‧ Pushing members

90‧‧‧Locking disc

92‧‧‧Locking surface

94‧‧‧Fixed washers

Claims (5)

A force-increasing mechanism for a locking device, comprising: a moving member disposed on an outer peripheral side of a rotating shaft of the rotating table, movable in an axial direction of the rotating shaft, and having a first guiding surface capable of receiving a spherical body; and a fixed side member a second guide surface that receives the spherical body together with the first guiding surface on a side of the fixed frame that supports the rotating shaft; and a pressing member that is movable in an axial direction of the rotating shaft and has a third guiding The third guiding surface receives the spherical body guided by the first guiding surface and the second guiding surface in accordance with the movement of the moving member, and is urged toward the moving direction of the moving member through the spherical body to The restriction of the rotation of the rotating shaft or the positioning of the stop position is performed, and all of the first to third guiding surfaces are formed into a groove having a curved shape in contact with the surface of the spherical body. The force-increasing mechanism of the locking device according to claim 1, further comprising: any one of the pressing member fixed to the rotating shaft side or the fixed frame side; the locking surface being formed on the rotating shaft side Or the other of the other of the fixed frame sides, and the pressing member is pressed against the locking surface by the movement of the pressing member to restrict the rotation of the rotating shaft. The force increasing mechanism of the locking device according to claim 1, further comprising: a rotating side engaging portion provided on the rotating table; and a fixed side engaging portion provided in the fixed frame; The pressing side engaging portion is provided in the pressing member, and is engaged with the rotating side engaging portion and the fixed side engaging portion, and the pressing side engaging portion is moved by the pressing member At the same time, the rotation side engagement portion and the fixed side engagement portion are engaged to perform positioning of the rotation of the rotation shaft. The force-increasing mechanism of the lock device according to claim 3, wherein the engagement between the rotation-side engagement portion and the fixed-side engagement portion and the pressing-side engagement portion is a concave-convex fit. The force-increasing mechanism of the locking device of claim 1, wherein the ball is configured to move away from the adjacent ball.