JPH06262488A - Dividing device - Google Patents

Abstract

PURPOSE:To provide a dividing device wherein manufacture is simplified at a low cost while properly transmitting turning force of a drive shaft to a dividing table through a turn shaft. CONSTITUTION:A device comprises a dividing table, internal tooth member 9, external tooth member 8, movable tooth member 10 which can be meshed/ separated relating to the internal and external tooth members 9, 8, worm cam 26 formed in the periphery of a drive shaft 19 and a plurality of rollers 25 slid to be coupled to this worm cam 26 and also radially arranged in the periphery of a roller shaft associated with a turn shaft 3 of the dividing table. In the dividing device constituted by transmitting turning force of the drive shaft 19 to the turn shaft 3 through the worm cam 26 and the roller 25 so as to drive the dividing table by turning this turn shaft 3, a cam lead 26e, slid to be coupled to only one of the rollers 25, is helically formed over almost the full periphery of the worm cam 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing device, and more particularly to a new improvement for achieving a simple and low cost worm cam manufacturing.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a conventional indexing device disclosed in Japanese Unexamined Patent Publication No. 64-78742, in which reference numeral 1 is a rotatable indexing table and reference numeral 2 is below the indexing table. It is a base placed in.

A rotary shaft 3 is attached to the rear surface of the indexing table 1 so as to penetrate the base 2 from the center thereof, and a sleeve is provided on the outer periphery of the rotary shaft 3 via a stroke bearing 4. 5 is fitted so as to be slidable in the axial direction. This sleeve 5, indexing table 1 and base 2
A ring-gear-shaped meshing joint (curvic coupling) 6 is disposed between and. The meshing joint 6 positions and clamps the indexing table 1 by meshing the gears, and also fixes the annular outer tooth member 8 fixed to the indexing table 1 via the turning ring 7 and the base 2. The ring-shaped inner tooth member 9 and the inner tooth member 9 and the outer tooth member 8 which are arranged so as to face each other are meshed with the inner tooth member 9 and the outer tooth member 8.
The movable tooth member 10 is separable. Since the movable tooth member 10 is fixed to the upper flange 5a of the sleeve 5, it is possible to follow the vertical movement of the sleeve 5.

The shift block 11 provided on the outer periphery of the lower portion of the sleeve 5 is slidably fitted between the step portion of the sleeve 5 and the plate 12, and is orthogonal to the sleeve 5 on both sides of the shift block 11. A groove-shaped recess 13 is formed. Two arms 14 are arranged so as to sandwich the shift block 11 from both sides, and each arm 14 has a shaft 15
It is rotatably supported by. Further, the slider plate 16 which is pin-connected to the inside of the arm 14 is fitted and engaged in the recess 13 of the shift block 11.

A roller 17 is attached to the tip of each arm 14, and a plate cam 18 that engages with each roller 17 and swings the arm 14 is keyed to a drive shaft 19. Therefore, as the drive shaft 19 rotates, the plate cam 1
When the arm 8 pushes the arm 14 downward, the sleeve 5 is moved through the slider plate 16 and the shift block 11.
Can be pulled down against the spring 20 so that the movable tooth member 10 meshes with the inner tooth member 9 and the outer tooth member 8 and, at the same time, is fixed to a predetermined indexing position of the indexing table 1. The driven shaft 21 fixed to the rotating shaft 3 and a drive gear 22 fixed to a roller shaft 23, which will be described later, are engaged with each other so that the rotating shaft 3 and the roller shaft 23 are interlocked with each other.

The roller shaft 23 is arranged in parallel with the rotating shaft 3, and six rollers 25 are radially arranged around the roller shaft 23 via a roller holder 24. Each roller 25 has a drive shaft 19 as shown in FIG.
It is slidably connected to the worm cam 26 formed around the. The worm cam 26 is formed with a spiral lead portion 26a having a mountain-shaped cross section, and three rollers 25 are in sliding contact with each lead portion 26a.
That is, the central roller 25 slides along the concave guide groove 26b formed between the lead portions 26a, and the rollers 25, 25 on both sides are formed on the lead portion 26a to reduce the backlash. It is always in sliding contact with 26c and 26d.

Therefore, by rotating the drive shaft 19 with a step motor (not shown), the sliding surfaces 26c, 26d of the lead portion 26a and the two rollers 25, 25 on both sides cooperate to cancel the backlash while guiding. Groove 2
6b, the central roller 25 is moved in the circumferential direction, and at the same time, the roller holder 24 is also rotated.
The roller shaft 23 can be indexed and rotated with high accuracy in the same direction as the rotation direction of. An annular bearing (cross roller) divided into two is provided between the swivel ring 7 fixed to the indexing table 1 and the external tooth member 8 and between the upper outer periphery of the base 2 and the internal tooth member 9. Radial thrust bearing) 2
7a and 27b are inserted. And the turning ring 7
The indexing table 1 is rotatably supported via an outer bearing 27a sandwiched between the outer tooth member 8 and the outer tooth member 8.

Next, based on the configuration of the indexing device described above,
The operation will be described. By rotating the drive shaft 19 with a step motor (not shown), the plate cam 18 and the worm cam 26 start rotating. Then, the pushing motion of the arm 14 is released by the plate cam 18, and the sleeve 5 that engages with the arm 14 via the shift block 11 is floated by the urging force of the spring 20. As a result, the movable tooth member 1
0 is separated from the inner tooth member 9 and the outer tooth member 8. In this case, the indexing table 1 does not float, and furthermore, the indexing table 1 and the external tooth member 8 can be freely rotated through the bearings 27a and 27b between the indexing table 1 and the base 2. You can Furthermore, the worm cam 26 and the roller 25
The roller shaft 23 rotates in cooperation with the drive gear 22 and the driven gear 21, and the rotary shaft 3 and the indexing table 1 rotate.

In this rotation, the roller shaft 23 is rotated by a predetermined rotation angle (one pitch of the roller 25),
When the indexing table 1 reaches a predetermined indexing position according to the rotation angle and the gear ratio of the gears 21 and 22, the plate cam 18 is moved.
As a result, the arm 14 is pushed downward, the sleeve 5 is pulled down against the spring 20 accordingly, the movable tooth member 10 meshes with the inner tooth member 9 and the outer tooth member 8, and the indexing table 1 is predetermined. Can be stopped at the position.

[0010]

Since the conventional indexing device is constructed as described above, there are the following problems. That is, each sliding surface 26 of the lead portion 26a
In order for c and 26d to have a backlash eliminating function, it is necessary to improve the processing accuracy of the sliding surfaces 26c and 26d, and as a result, there is a problem that the manufacturing of the worm cam is complicated and the manufacturing cost is high. there were.

The present invention has been made to solve the above problems, and in particular, the rotational force of the drive shaft is appropriately transmitted to the indexing table via the rotary shaft, and the manufacturing is simple. An object is to provide a low cost indexing device.

[0012]

An indexing device according to the present invention includes an indexing table rotatably provided on a base, an internal tooth member fixed to the base, and an indexing table fixed to the indexing table. An external tooth member, a movable tooth member that is arranged to face the internal tooth member and the external tooth member and that can be meshed with and separated from the internal tooth member and the external tooth member, and a worm formed around the drive shaft. A cam and a plurality of rollers slidably connected to the worm cam and radially arranged around a roller shaft that is interlocked with the rotary shaft of the indexing table,
In the indexing device configured to transmit the rotational force of the drive shaft to the rotary shaft via the worm cam and the roller, and drive the indexing table by the rotation of the rotary shaft. The cam lead, which is slidably connected to only one of the rollers, is formed in a spiral shape over substantially the entire circumference of the cam.

More specifically, four rollers are arranged at equal intervals around the roller holder arranged on the roller shaft with a phase angle of 90 degrees.

More specifically, a sliding rod extending vertically from the movable tooth member and inserted into an opening between the inner tooth member and the outer tooth member is separated from the rotary shaft. It is configured to be driven via a pair of link mechanisms that are arranged in parallel and that interlock with the rotation of the drive shaft.

[0015]

In the indexing device according to the present invention, at the same time when the drive shaft is rotated, the movable tooth member is separated from the inner tooth member and the outer tooth member to set the indexing table in a free state and to drive the drive shaft. The worm cam is rotated by the rotating force of the roller to rotate the roller shaft in the circumferential direction while one roller slides in the cam lead. After rotating the indexing table at a predetermined position by rotating it at the indexing angle, by engaging the movable tooth member with the internal tooth member and the external tooth member,
The indexing table can be fixed at any position. Further, the indexing table can be freely rotated by separating the movable tooth member from the inner tooth member and the outer tooth member.

[0016]

The preferred embodiments of the indexing device according to the present invention will be described in detail below with reference to the drawings. In addition, the same or equivalent portions as those of the conventional example will be described using the same reference numerals.

In FIGS. 1 and 2, reference numeral 1 is an indexing table, and a base 2 forming a housing is arranged below the indexing table 1. A hollow rotating shaft 3 penetrating the inside of the base 2 is fixedly provided at the center of the indexing table 1, and a cylindrical guide sleeve fixed to the base 2 by bolts or the like is provided on the outer periphery of the rotating shaft 3. 30 are provided. Further, a ring gear-shaped meshing joint (curvic coupling) 6 is arranged between the indexing table 1 and the base 2.

The meshing joint 6 positions and clamps the indexing table 1 by meshing gears, and
An annular outer tooth member 8 fixed to the indexing table 1 via the ring body 1a and a fixed surface 2b formed on the top surface 2A of the base 2 are directly fixed to the outer tooth member 8 with bolts and the like. And a piece-shaped internal tooth member 9 arranged at a predetermined distance L, and is arranged so as to face the internal tooth member 9 and the external tooth member 8 and can be meshed / separated with respect to the internal tooth member 9 and the external tooth member 8. A piece-shaped movable tooth member 10 is provided. This movable tooth member 1
0 moves up and down by a movable tooth actuating device 40 (see FIG. 3), which will be described later, and meshes with the internal tooth member 9 and the external tooth member 8.
It is configured so that it can be separated.

Here, four (only one is shown) of the internal tooth members 9 fixed to the base 2 are arranged with a phase angle of 90 degrees with respect to the indexing table 1, and the movable tooth member 1 is provided.
The number 0 is also four (only one is shown) positioned so as to face the internal tooth member 9 and has substantially the same length as the internal tooth member 9 in the circumferential direction. Although the four internal tooth members 9 and the movable tooth members 10 are arranged with a phase angle of 90 degrees in this embodiment, the number and location of them are arbitrary, and they are the same as the shape of the external tooth member 8. It can also be circular.

A roller shaft 23 is arranged in the base 2 in parallel with the rotating shaft 3. This roller shaft 23
A cylindrical roller holder 24 is provided in the central portion of the roller holder integrally or by key connection.
Around the circumference of 4 are four rollers 25 radially with a phase angle of 90 degrees.
Are arranged at equal intervals. Further, only one of the rollers 25 is slidably coupled to a worm cam 26 that is separately fixed around the drive shaft 19. This warm cam 26
A groove-shaped cam lead 26e having a width substantially equal to the diameter of the roller 25 is spirally formed on the inner peripheral surface of the lead portion 26a of the roller 25, and one roller 25 can be appropriately slid on the cam lead 26e. Dynamically coupled. Only when the roller 25 comes off the cam lead 26e, the other rollers 2
5 contacts the cam lead 26e, and the roller 25 is sequentially fed into the cam lead 26e.

Further, as shown in FIG. 1, the rotary shaft 3 and the roller shaft 23 are driven gears 2 fixed to the end of the rotary shaft 3.
1, and a drive gear 22 fixed to the roller shaft 23. Further, as shown in FIG. 2, the drive shaft 19 includes a drive gear 32 fixed to a motor shaft 31 a of a step motor 31 fixed to the base 2 and a driven gear 33 fixed to the drive shaft 19. Are linked together. Therefore, by rotating the drive shaft 19 with the step motor 31, the roller 2 is moved along the cam lead 26e.
The roller shaft 23 can be indexed and rotated in the same direction as the rotation direction of the roller holder 24 while moving 5 in the circumferential direction.

Movable tooth actuating devices 40 for driving the movable tooth member 10 are arranged in pairs at respective lateral positions separated from the rotary shaft 3. This movable tooth actuating device 40, as shown in FIG.
Is provided with a sliding rod 41 extending vertically from the central portion of the. Each sliding rod 41 is fixed to the movable tooth member 10 by a bolt or the like, and has an opening 42 formed between the outer tooth member 8 and the inner tooth member 9 and a through hole 43 formed in the base 2. It is inserted inside. Further, the sliding rod 41 is driven in the vertical direction via a link mechanism 44 that interlocks with the rotation of the drive shaft 19. The link mechanism 44
Forms a part of the movable tooth actuating device 40 that drives the two sliding rods 41 at the same time, and is arranged in a lateral position in the base 2 separated from the rotating shaft 3.

The link mechanism 44 will now be described. At the lower end of each sliding rod 41, first and second driven rods 47, 47 are provided via first and second pivotally connecting pins 45, 46.
48 are pivotally attached. The first and second driven rods 4
The bases 2 and 7 are arranged substantially horizontally and in a straight line.
The first and second support shafts 49 and 50 fixed to the center are swingable, and are connected by a connecting pin 51 (see FIG. 2). Furthermore, the first and second driven rods 47, 4
A drive rod 52, which is substantially parallel to the driven rods 47 and 48, is disposed below the drive rod 8. A standing piece 52a is formed at one end of the drive rod 52, and the driven rods 47, 4 are formed by the standing piece 52a.
By sandwiching 8 and inserting the connecting pin 51 into the upright piece 52a, the first and second driven rods 47 and 48 can be swung following the swing of the drive rod 52.

The drive rod 52 swings about a third support shaft 53 fixed to the base 2, and the other end of the drive rod 52 is fixed to the drive shaft 19 and is centered on the drive shaft 19. The standing piece 52a can be moved up and down at a predetermined speed by following the cam surface 18a of the rotating plate cam 18. Therefore, when the upright piece 52a moves upward, the first and second support shafts 4
The first and second driven rods 47, 4 centering around 9, 50
As a result of the downward movement of the first and second pivot pins 45 and 46 of No. 8, the movable tooth member 10 is moved downward via the sliding rod 41 so as to move with the inner tooth member 9 and the outer tooth member 8. It can be meshed with the tooth member 10. Also, the standing piece 52a
Is moved downward, the first and second support shafts 49, 50
Centering around the first and second driven rods 47, 48
And the second pivot pins 45, 46 move upwards,
The movable tooth member 10 is moved upward through the sliding rod 41 to move the movable tooth member 1 relative to the inner tooth member 9 and the outer tooth member 8.
Zeros can be separated.

Here, as shown in FIG. 1, the sliding surface 8a forming the bottom surface of the indexing table 1 formed on the bottom surface of the external tooth member 8 and the outer surface of the top surface 2A of the base 2 are slidable. By forming an oil mist surface between the bearing surface 8a and the support surface 2a that directly supports the sliding surface 8a, the external tooth member 8 can be smoothly rotated with respect to the support surface 2a. In this case, a plurality of oil mist supply ports 60 (for example, four at equal intervals in the circumferential direction) are formed on the support surface 2a, and the oil mist supply ports 60 are arranged at arbitrary positions on the support surface 2a (note that , It is also suitable to form a ring). Further, the oil mist supply port 60 communicates with an oil mist supply device 62 composed of a small pump via a conduit 61, and discharges the oil mist of a predetermined pressure from the oil mist supply port 60 as necessary to keep the oil mist constant. It is supplied intermittently every hour. By forming the fixed surface 2b and the support surface 2a formed on the top surface 2A of the base 2 on the same plane, it is possible to make the inner tooth member 9 and the outer tooth member 8 have the same height. it can.

Therefore, when the movable tooth member 10 is separated from the inner tooth member 9 and the outer tooth member 8 and the outer tooth member 8 is rotated with respect to the base 2, oil of a predetermined pressure is supplied from the oil mist supply device 62. The mist is supplied, and the space between the support surface 2a of the base 2 and the sliding surface 8a of the external tooth member 8 is made to float very slightly via the conduit 61 and the oil mist supply port 60. Also,
When the movable tooth member 10 is meshed with the inner tooth member 9 and the outer tooth member 8, by stopping the operation of the oil mist supply device 62, the supply of the oil mist of a predetermined pressure is interrupted, and the index table 1 is stopped. The sliding surface 8a of the outer tooth member 8 is brought into contact with the supporting surface 2a of the base 2 by its own weight. As a result, the external tooth member 8 can be supported in a constant state on the rigid base 2, and the movable tooth member 10 can be supported.
When engaging with the internal tooth member 9 and the external tooth member 8, the engaging force can be directly received by the base 2.

A ring plate 64 having a predetermined cutout is attached to the drive shaft 19, and a sensor 65 for detecting one rotation of the drive shaft 19 is arranged at a position facing the ring plate 64. (See FIG. 2).
Further, the driven gear 21 includes a cylindrical body 6 surrounding the rotary shaft 3.
6 is fixed, and through holes 66a are formed at predetermined positions in the circumferential direction and the vertical direction of the cylindrical body 66 according to the number of indexes (see FIG. 1). Then, a plurality of sensors 67 are arranged so as to face the through holes 66a in the vertical direction, and monitor whether or not the indexing positions of the rotary shaft 3 and the indexing table 1 are accurate.

Next, the operation based on the configuration of the indexing device described above will be described. When driving the indexing table 1, the step motor 31 is driven and the drive shaft 19 is rotated via the gears 32 and 33, thereby rotating the plate cam 18 and the worm cam 26. Then, the plate cam 18 moves the upright piece 52a of the drive rod 52 downward using the third support shaft 53 as a pivotal support point to move the first and second support shafts 4a and 4b.
The first and second driven rods 4 and 9 are pivotal fulcrums.
The first and second pivot pins 45 and 46 of 7, 48 are moved upward. As a result, the movable tooth member 10 is moved upward via the sliding rod 41 to separate the movable tooth member 10 from the inner tooth member 9 and the outer tooth member 8.

Simultaneously with this separation, the oil mist of a predetermined pressure is supplied from the oil mist supply device 62 via the conduit 61 and the oil mist supply port 60, and the oil mist of a predetermined pressure is slid on the sliding surface of the external tooth member 8. 8a and supporting surface 2a of base 2
And continue to supply. Therefore, the indexing table 1 floats slightly above the base 2, and the worm cam 2
6 and the roller 25 cooperate to rotate the roller shaft 23,
The rotation shaft 3 and the indexing table 1 are rotated by the meshing of the drive gear 22 and the driven gear 21.

In this rotation, when the drive shaft 19 makes one rotation, the roller shaft 23 rotates 90 degrees (one pitch of the roller 25), and the indexing table 1 has a predetermined number corresponding to the gear ratio of the gears 21 and 22. When it reaches the indexing position, the operation of the oil mist supply device 62 is stopped and the pressure of the oil mist is eliminated, so that the sliding surface 8a of the external tooth member 8 is brought into contact with and supported by the supporting surface 2a of the base 2. Let Then, the plate cam 18 moves the upright piece 52a of the drive rod 52 upward with the third support shaft 53 as a pivot, thereby moving the first and second support shafts 4a and 4b.
The first and second driven rods 4 and 9 are pivotal fulcrums.
The first and second pivot pins 45 and 46 of 7, 48 are moved downward. As a result, the movable tooth member 10 moves downward via the sliding rod 41, the movable tooth member 10 meshes with the inner tooth member 9 and the outer tooth member 8, and the indexing table 1
Can be stopped at a predetermined position.

The indexing angle of the indexing table 1 is
It goes without saying that the ratio can be arbitrarily set by changing the gear ratio of the gears 21 and 22. In addition, the movable tooth member 1
0 is not limited to the configuration of the movable tooth actuating device 40 described above, and may be driven by a well-known actuator, for example. Further, the bottom surface (sliding surface) 8a of the indexing table 1 can be formed by the bottom surface of the external tooth member 8 and the bottom surface of the ring body 1a.

[0032]

Since the indexing device according to the present invention is constructed as described above, the following effects can be obtained. That is, since the cam lead which is slidably coupled to only one of the rollers is formed in a spiral shape over substantially the entire circumference of the worm cam, it is not necessary to consider backlash in the slidable coupling of the cam lead and the roller. In addition, the worm cam has an excellent effect that it is easy to manufacture and a low-cost indexing device can be achieved. In addition, even if a slight error occurs in the coupling accuracy between the cam lead and the roller due to the lack of the backlash elimination function, it is within the allowable range, the movable tooth member, the inner tooth member, and the outer tooth member. It is sufficient to reliably control the timing of engagement with the member. Furthermore, by disposing four rollers at equal intervals around the roller holder, the diameter of the roller holder can be reduced, and the indexing device can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an indexing device of the present invention.

FIG. 2 is a cross-sectional view showing the indexing device of the present invention.

FIG. 3 is a side view showing a movable tooth actuating device applied to the present invention.

FIG. 4 is a vertical sectional view showing a conventional indexing device.

FIG. 5 is a cross-sectional view showing a conventional indexing device.

[Explanation of symbols]

 1 Indexing Table 2 Base 3 Rotating Shaft 8 External Tooth Member 9 Internal Tooth Member 10 Movable Tooth Member 19 Drive Shaft 23 Roller Shaft 24 Roller Holder 25 Roller 26 Worm Cam 26e Cam Lead 41 Sliding Rod 42 Opening 44 Link Mechanism

Claims (3)

[Claims] 1. An indexing table (1) rotatably provided on a base (2), an internal tooth member (9) fixedly mounted on the base (2), and the indexing table (1). The external tooth member (8) fixed to the inner tooth member (8) and the inner tooth member (9) and the outer tooth member (8), which are arranged to face each other. A movable tooth member (10) capable of meshing / separating, a worm cam (26) formed around the drive shaft (19), and a worm cam (26) are slidably coupled to the worm cam (26) and the indexing table (1) A plurality of rollers (25) arranged radially around a roller shaft (23) interlocking with the rotating shaft (3) are provided, and the rotational force of the drive shaft (19) is transferred to the worm cam (26). And Laura (2
5) is transmitted to the rotary shaft (3) via the rotary shaft (3), and the rotary table (1) is driven by the rotation of the rotary shaft (3). An indexing device characterized in that a cam lead (26e) slidably coupled to only one of the rollers (25) is formed in a spiral shape over substantially the entire circumference of (26). 2. Four rollers (25) are arranged at equal intervals around a roller holder (24) arranged on the roller shaft (23) with a phase angle of 90 degrees. The indexing device according to claim 1. 3. A slide extending vertically from the movable tooth member (10) and inserted into an opening (42) between the inner tooth member (9) and the outer tooth member (8). Moving rod (41)
Are arranged apart from the rotary shaft (3) and are interlocked with the rotation of the drive shaft (19).
4. The indexing device according to claim 1, which is driven via 4).