JP2017127944A - Indexing device of tool post - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indexing device capable of surely locking rotation of a tool post in a stopping position.SOLUTION: An indexing device 10 comprises a rotary shaft 14 for fixing a tool post 16 and a fixing frame 12 for rotatably supporting the rotary shaft 14. A positioning mechanism 30 comprises a moving member 32, a support member 50 and a diameter expanding part 58 on the rotary shaft 14 side. The moving member 32 is movably arranged in the axial direction of the rotary shaft 14 between the fixing frame 12 and the rotary shaft 14, and comprises a guide surface 38 for receiving a ball 70. A ball groove 60 opposed to the guide surface 38 of the moving member 32 is formed on the outer periphery of the diameter expanding part 58. The support member 50 comprises a cylindrical part 52 arranged between the guide surface 38 and the ball groove 60, and the cylindrical part 52 is provided with a hole 54 capable of moving the ball 70 in the radial direction. The ball 70 is pushed in the ball groove 60 by the guide surface 38 by lifting the moving member 32, and stopping of the rotary shaft 14 is locked.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indexing device for a tool post, and more specifically to positioning of a rotation stop position of the tool post.

  As a rotary indexing device for a tool post such as a machine tool, for example, there is a turret tool post described in Patent Document 1 below. According to the technique, a ball nut rotated by a motor, a ball screw screwed to the ball nut, a brake means for stopping the rotation of the ball screw as necessary, and the ball nut and the ball screw are connected to each other. It is disclosed that a clutch member that is disengaged and the turret is rotated and positioned and clamped by a single motor by selectively applying a brake and a clutch.

JP-A-5-138410

  However, in the technique described in Patent Document 1 described above, by providing a crown-shaped coupling on the flange side of the rotation shaft, and aligning the teeth with the same-shaped coupling formed on the end face of the turret, Although the turret is positioned and clamped, a tooth shape must be provided on the entire circumference, which complicates the structure.

  The present invention focuses on the above points, and provides a tool post indexing device that can reliably stop the rotation of the tool post at the stop position with a relatively simple configuration. Objective.

  The turret indexing device of the present invention includes a rotating shaft having a turret fixed to one end side, a fixed frame that rotatably supports the rotating shaft, and the rotation between the fixed frame and the rotating shaft. A moving member that is provided so as to be movable in the axial direction of the shaft, receives a ball, and pushes the ball toward the rotating shaft by the guiding surface; and the moving member on an outer peripheral surface of the rotating shaft Is formed in the axial direction of the rotating shaft so as to face the guide surface of the ball, and is disposed between the ball groove having a curved surface for receiving the ball and the guide surface of the moving member and the ball groove on the rotating shaft side. And a support member fixed to the fixed frame and having a hole for holding the ball.

  One of the main forms is a driving means for moving the moving member toward the tool post along the axial direction of the rotating shaft, and an urging means for urging the moving member in a direction opposite to the tool post. , Provided. Another embodiment is characterized in that the guide surface of the moving member is a groove having a curved surface shape in line contact with the surface of the ball. Yet another embodiment is characterized in that a plurality of the balls are arranged apart from adjacent balls. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the indexing device of the present invention, a rotating shaft having a tool post fixed to one end side, a fixed frame that rotatably supports the rotating shaft, and the rotating shaft between the fixed frame and the rotating shaft. A moving member that pushes the ball toward the rotating shaft by the guiding surface, and an outer peripheral surface of the rotating shaft. It is formed in the axial direction of the rotating shaft so as to face the guide surface, and is disposed between a ball groove having a curved surface for receiving the ball, and a guide groove of the moving member and a ball groove on the rotating shaft side. And a support member fixed to the fixed frame, and having a hole for holding the ball. For this reason, rotation of the tool post can be locked at a predetermined stop position with a relatively simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Example 1 of this invention, (A) is principal sectional drawing which shows the locked state of a positioning mechanism, (B) is sectional drawing which shows arrangement | positioning of the ball | bowl in a locked state. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Example 1 of this invention, (A) is principal sectional drawing which shows the unlocking state of a positioning mechanism, (B) is sectional drawing which shows arrangement | positioning of the ball | bowl in an unlocking state.

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

  First, Embodiment 1 of the present invention will be described with reference to FIGS. 1A and 1B are diagrams showing a locked state of a positioning mechanism of an indexing device according to the present embodiment. FIG. 1A is a main cross-sectional view, and FIG. 1B is a cross-sectional view showing an arrangement of balls. A view taken along line # A- # A and viewed in the direction of the arrow corresponds to (A). 2 is a diagram showing an unlocked state of the positioning mechanism of the indexing device of the present embodiment, (A) is a main sectional view, and (B) is a sectional view showing the arrangement of balls. A cross-sectional view of B) cut along line # B- # B and viewed in the direction of the arrow corresponds to (A).

  As shown in FIGS. 1 (A) and 2 (A), the indexing device 10 of the present embodiment is capable of rotating a rotating shaft 14 on a fixed frame 12 by known bearings 20, 22, 24, 26, and the like. It is supported by. A tool post 16 is fixed to one end side (the upper end side in the illustrated example) of the rotating shaft 14 with a bolt 18 or the like. For example, a cutting tool (not shown) or the like is attached to the tool post 16. The rotating shaft 14 is rotationally driven by a motor (not shown) provided on the other end side (lower end side in the illustrated example). Alternatively, a worm wheel (not shown) may be provided at an appropriate position of the rotary shaft 14, and a worm shaft that meshes with the worm wheel may be connected to a motor or the like (not shown) to drive the rotary shaft 14. Such an indexing device 10 is provided with a positioning mechanism (or lock mechanism) 30 for reliably stopping the rotation stop position of the tool post 16 at a predetermined position.

  The positioning mechanism 30 stops and holds the rotary shaft 14 at a predetermined rotational position, and includes a moving member 32, support members 34 and 50, a diameter-enlarged portion 58 on the rotary shaft 14 side, a ball 70, and the like. ing. The moving member 32 is provided between the fixed frame 12 and the rotating shaft 14 so as to be movable in the axial direction of the rotating shaft 14, and has a guide surface 38 that receives the ball 70. In this embodiment, the guide surface 38 is formed in the axial direction of the rotating shaft 14 and has a curved surface shape (see FIG. 1B) that makes a line contact with the surface of the ball 70. It has become. As shown in FIG. 1A, the guide surface 38 has a vertical portion 40A on the lower side and an inclined portion 40B on the upper side when viewed in the axial section. Then, the ball 70 is pushed into the rotating shaft 14 side by the guide surface 38.

  Further, a hole 42 is formed near the outer periphery of the moving member 32, and one end portion 44A side of the spring 44 is accommodated. The other end 44 </ b> B of the spring 44 is in contact with a stepped portion 56 of a support member 50 provided above the moving member 32. The moving member 32 is always biased downward by the spring 44.

  Further, an air chamber 36 is formed between the bottom surface of the moving member 32 and a support member 34 provided below the moving member 32. On the side surface of the fixed frame 12, a passage (not shown) is formed at a position that leads to the air chamber 34 even when the moving member 32 is at the lowest position. An air supply / exhaust device (not shown) provided outside the fixed frame 12 is provided in the passage. When air is sent to the air chamber 36 by the air supply / exhaust device, the moving member 32 rises (state shown in FIG. 1A), and conversely, when the air is extracted from the air chamber 36, the moving member 32 is lifted. Is lowered by the biasing force of the spring 44 (state shown in FIG. 2A).

  Next, the enlarged diameter portion 58 will be described. In the present embodiment, the enlarged diameter portion 58 is formed integrally with the rotating shaft 14 and has a substantially columnar shape (or substantially cylindrical shape) having a diameter larger than that of the rotating shaft 14. A ball groove 60 is formed on the outer peripheral surface of the enlarged diameter portion 58 in the axial direction of the rotary shaft 14 so as to face the guide surface 38 of the moving member 32. As shown in FIGS. 1B and 2B, the ball groove 60 is a ball groove 60 having a curved surface that receives the ball 70.

  Next, the support member 50 is disposed above the moving member 32, and includes a cylindrical portion 52 disposed between the ball groove 38 of the moving member 32 and the ball groove 60 of the enlarged diameter portion 58. Have. The cylindrical portion 52 has a hole 54 for holding the ball 70. The support member 50 is fixed to the fixed frame 12 side by appropriate means. A step portion 56 is formed around the cylindrical portion 52 of the support member 50, and the other end portion 44 </ b> B of the spring 44 is in contact with the step portion 56. For this reason, the moving member 32 is always urged downward (on the side opposite to the tool post 16) by the spring 44.

  Next, the operation of this embodiment will be described. FIG. 2A shows an unlocked state. In this state, the air chamber 36 is not supplied with air, and the moving member 32 is biased downward by the spring 44. For this reason, the ball 70 is supported not by the vertical portion 40A of the guide surface 38 of the moving member 32 but by the inclined portion 40B. That is, the ball 70 moves radially outward from the locked state indicated by the broken line in FIG. 2A, and the engagement between the ball 70 and the ball groove 60 of the enlarged diameter portion 58 is released. A plan view of this state is as shown in FIG. In other words, the positioning mechanism 30 is unlocked, and the rotating shaft 14 is rotated by a driving mechanism (not shown) in this state, whereby the rotating shaft 14 is rotated and the tool post 16 is also rotated. The rotation angle of the held tool (not shown) is changed.

  In the case where the tool post 16 is rotated by a predetermined angle as described above and then the rotation of the rotary shaft 14 is stopped and locked, as shown in FIG. Air is fed into the chamber 36. Accordingly, the moving member 32 is moved in the axial direction of the rotating shaft 14 (upward in the illustrated example) against the urging force of the spring 44. When the moving member 32 is lifted, the ball 70 held on the guide surface 38 of the moving member 32 is pushed up by the linear portion 40A of the guide surface 38 and the inside of the hole 54 of the support member 50 is on the side of the rotating shaft 14. And fit into the ball groove 60 of the enlarged diameter portion 58. Since the ball 70 pushed into the rotating shaft 14 side is restricted from moving outward by the vertical portion 40A of the guide surface 38, as shown in FIG. Thus, the rotary shaft 14 can be reliably locked at a predetermined stop position.

  During the locking operation as described above, the ball groove 60 that receives the ball 70 is a groove (R groove) having a curved surface shape that makes line contact with the surface of the ball 70. That is, by holding the ball 70 in the R groove, friction is generated between the ball 70 and the ball groove 60, so that the ball 70 can be locked with a large load. When releasing the lock state, if air is discharged from the air chamber 36 by the air supply / exhaust means (not shown), the moving member 32 is lowered by the urging force of the spring 44, and the ball 70 moves radially outward. The lock due to the engagement between the ball 70 and the ball groove 60 is released, and the rotation shaft 14 can be rotated (FIGS. 2A and 2B).

As described above, according to the first embodiment, the indexing device 10 includes the rotation shaft having the tool post fixed to one end side, the fixed frame that rotatably supports the rotation shaft, the fixed frame, and the rotation shaft. And a moving member that is provided so as to be movable in the axial direction of the rotating shaft, receives a ball, and pushes the ball toward the rotating shaft by the guide surface, and an outer periphery of the rotating shaft The surface is formed in the axial direction of the rotating shaft so as to face the guide surface of the moving member, and has a ball groove having a curved surface for receiving the ball, the guide surface of the moving member, and the rotating shaft side. Since it is arranged between the ball grooves and has a hole for holding the ball and a support member fixed to the fixed frame, the following effects are obtained.
(1) The rotation of the tool post 16 can be reliably locked at a predetermined position with a relatively simple configuration.
(2) Since the ball groove 60 of the enlarged diameter portion 58 of the rotating shaft 14 and the surface of the ball 70 are in line contact, a frictional force is generated and the ball can be locked with a large load.
(3) Since the ball 70 is held by the R-groove shaped guide surface 38 of the moving member 32 and the hole 54 of the support member 50, the position of the ball 70 can be fixed. For this reason, it is only necessary to provide the necessary number (four in this embodiment) without providing the balls 70 over the entire circumference of the rotating shaft 14.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes and dimensions shown in the above embodiments are examples, and may be appropriately changed as necessary. As for the material, various known materials may be used as long as the same effect can be obtained.
(2) In the above embodiment, four balls 70 are provided. However, this is also an example, and the number of balls 70 may be appropriately increased or decreased within a range in which the same effect can be obtained.
(3) In the above embodiment, the guide surface 38 of the moving member 32 and the ball groove 60 of the enlarged diameter portion 58 are R-grooves having a curved surface in line contact with the surface of the ball 70. If the groove is an R groove, the guide surface 38 on the moving member 32 side is not necessarily an R groove.

(4) In the above embodiment, the drive mechanism using the worm wheel is given as an example of the drive mechanism of the rotating shaft 14, but the present invention is not limited to this. The rotational drive mechanism can be applied.
(5) Although air pressure is used as means for moving the moving member 32 in the above embodiment, this is also an example, and a known mechanism using other fluids may be used.
(6) Although not shown in the first embodiment, various known sensors (stroke sensor, pressure sensor, displacement sensor, etc.) may be provided to detect the amount of movement of the moving member 32.
(7) The indexing device of the present invention can be applied to all machine tools having a tool post.

  According to the present invention, a rotating shaft having a tool post fixed to one end side, a fixed frame that rotatably supports the rotating shaft, and an axial direction of the rotating shaft between the fixed frame and the rotating shaft. A movable member is provided, and has a guide surface for receiving the ball. The moving member pushes the ball toward the rotating shaft by the guide surface, and the outer peripheral surface of the rotating shaft faces the guide surface of the moving member. The ball is formed in the axial direction of the rotating shaft, and is disposed between a ball groove having a curved surface for receiving the ball, a guide surface of the moving member, and a ball groove on the rotating shaft side, And a support member that has a hole for holding the ball and is fixed to the fixed frame. For this reason, since the rotation of the tool post can be locked at a predetermined stop position with a relatively simple configuration, it is applicable to the use of the tool post indexing device.

10: Indexing device 12: Fixed frame 14: Rotating shaft 16: Tool post 18: Bolt 20, 22, 24, 26: Bearing 30: Positioning mechanism (locking mechanism)
32: Moving member 34: Support member 36: Air chamber 38: Guide surface 40A: Vertical portion 40B: Inclined portion 42: Hole 44: Spring 44A, 44B: End portion 50: Support member 52: Tube portion 54: Hole 56: Step Part 58: Expanded diameter part 60: Ball groove 70: Ball

Claims (4)

A rotating shaft with a tool post fixed to one end side;
A fixed frame that rotatably supports the rotating shaft;
A movable member provided between the fixed frame and the rotary shaft so as to be movable in the axial direction of the rotary shaft, and having a guide surface for receiving the ball, and for pushing the ball toward the rotary shaft by the guide surface. When,
A ball groove having a curved surface that is formed in the axial direction of the rotating shaft so as to face the guide surface of the moving member on the outer peripheral surface of the rotating shaft; and
A support member that is disposed between the guide surface of the moving member and the ball groove on the rotating shaft side, has a hole for holding the ball, and is fixed to the fixed frame;
A tool post indexing device characterized by comprising: Drive means for moving the moving member toward the tool post along the axial direction of the rotating shaft;
Biasing means for biasing the moving member in a direction opposite to the tool post;
The tool post indexing device according to claim 1, comprising:   The indexing device for a tool post according to claim 1 or 2, wherein the guide surface of the moving member is a groove having a curved shape in line contact with the surface of the ball.   The indexing device for a tool post according to any one of claims 1 to 3, wherein a plurality of the balls are arranged apart from adjacent balls.

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