JPH10113847A - Rotary table for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the whole of a device so that the device can be easily incorporated in a machine tool by employing a planet gear mechanism as substitute for a worm gear mechanism and arranging a motor in parallel with the rotary center axis of a turn table. SOLUTION: A motor 21, planet gear mechanism 22 locking mechanism 30 and turn table 40 are installed in a box-like housing 11, and the motor 21 is arranged in parallel with the rotary center axis A of the turn table 40. The motor 21 rotatably drives the turn table 40 through the planet gear mechanism 22, a pinion 22b and a ring gear 40c, and the locking mechanism 30 can lock the turn table 40 at a specified angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary table for a machine tool, such as a lathe, capable of fixing a work and indexing the work at an arbitrary rotation angle.

[0002]

2. Description of the Related Art A rotary table on which a work is loaded via an attachment and the work is indexed and set at an arbitrary rotation angle is widely used.

In a conventional rotary table, a rotary table is mounted on a housing and a motor attached to the housing is rotated to rotate the rotary table via a worm gear mechanism. The worm gear mechanism has a large diameter worm wheel attached to the rotary table to achieve a large reduction ratio.The motor is disposed at right angles to the rotation center axis of the rotary table, The worm meshes with the worm wheel. However, the motor is usually fixed so as to protrude from the side surface of the housing. Also, such a rotary table,
Generally, it is used by being incorporated into a machine tool.

[0004]

According to the prior art, the worm gear mechanism has an extremely low power transmission efficiency, so that the motor tends to be large in size.
Since the motor must be disposed at right angles to the rotation center axis of the turntable, the entire apparatus becomes unduly large, and there is a problem that it is extremely inconvenient to incorporate it into a machine tool.

[0005] In view of the above-mentioned problems in the prior art, an object of the present invention is to adopt a planetary gear mechanism in place of the worm gear mechanism and arrange the motor in parallel with the rotation center axis of the rotary table. An object of the present invention is to provide a rotary table of a machine tool that can be easily integrated into a machine tool by reducing the size of the entire apparatus.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a construction of the present invention comprises a box-shaped housing, a motor and a planetary gear mechanism incorporated in the housing, and a planetary gear mechanism mounted rotatably on the housing. And a rotary table connected to the motor through the rotary table. The motor is disposed in parallel with the rotation center axis of the rotary table, and the rotary table is lockable via a lock mechanism. And

The lock mechanism can include a rotary gear attached to the rotary table, a fixed gear fixed to the housing, a rotary gear, and a ring gear commonly meshed with the fixed gear. And a ring gear which is mounted on the housing via the diaphragm so as not to rotate relatively, and meshes with the rotating gear.

The lock mechanism may include a rotary pad attached to the rotary table, a fixed pad fixed to the housing, a rotary pad, and a ring pad commonly pressed against the fixed pad. It is also possible to provide a rotating pad to be attached, and a ring pad which is attached to the housing via a lock pin so as to be relatively non-rotatable and pressed against the rotating pad.

Further, the rotary table may have a through hole formed around the rotation center axis, and the housing may have a cylindrical member connected to the through hole.

[0010] The housing may contain a control unit.

[0011]

According to the structure of the present invention, the rotary table can be driven to rotate by a motor via a planetary gear mechanism, and can be set to an arbitrary rotation angle. Further, the rotary table can be locked at an arbitrary rotation angle via a lock mechanism. However, the planetary gear mechanism is connected to the rotary table via a simple gear mechanism and a timing belt mechanism with less backlash. The motor is built in the housing,
Since it is arranged parallel to the rotation center axis of the turntable, it does not protrude significantly outside the housing.

A lock mechanism including a rotary gear, a fixed gear, and a ring gear can lock the rotary table so that the rotary table cannot be rotated at each common tooth pitch of the gears by meshing the ring gear with the rotary gear and the fixed gear. The lock of the rotary table can be released by releasing the engagement of the ring gear with the rotary gear and the fixed gear.
Note that the rotary gear, the fixed gear, and the ring gear are each formed in a ring shape and are disposed so as to surround the rotation center axis of the rotary table, whereby the entire lock mechanism can be formed compact.

A lock mechanism having a rotary gear and a ring gear mounted on a housing via a diaphragm can lock the rotary table by meshing the ring gear with the rotary gear without using a fixed gear. The lock can be released by removing. This is because the ring gear is mounted via the diaphragm so as not to rotate relative to the housing.

When the lock mechanism includes a rotary pad, a fixed pad, and a ring pad, the ring pad can lock the rotary table at an arbitrary rotation angle by commonly pressing the rotary pad and the fixed pad.

A lock mechanism including a rotating pad and a ring pad mounted on the housing via a lock pin includes:
The rotary table can be locked at any rotation angle without using a fixed pad. This is because the ring pad is mounted via the lock pin so as not to rotate relative to the housing.

If a through-hole is formed around the rotation center axis of the rotary table, the rotary table allows a part of the work to pass through the through-hole and a cylindrical member connected to the through-hole. Even a work can be loaded without any trouble.

If the control unit is built in the housing,
The control unit can control the rotation of the motor by an external control signal, and can control the locking operation and the unlocking operation of the rotary table by the lock mechanism.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

The rotary table of the machine tool includes a housing 11, a motor 21 and a planetary gear mechanism 22 built in the housing 11, a lock mechanism 30 built in the housing 11, and a rotary table 40 mounted in the housing 11 as main members. (FIGS. 1 and 2).

The housing 11 is formed in a box shape with an open bottom. The lower end of the housing 11 has a leg 11
a, 11a are formed, a mounting groove 11b is formed above one leg 11a, and an upwardly protruding portion 11c is formed on the upper end surface on the mounting groove 11b side. In the interior of the housing 11, a storage portion 11d1 for the rotary table 40 is formed on the upper portion, and a partition wall 11d for forming a storage portion 11d2 for the planetary gear mechanism 22 in a downward direction is formed horizontally in a part thereof. . A bottom plate 12 is attached to a lower portion of the housing 11, and a cylindrical member 13 is incorporated in the housing 11. The cylindrical member 13
The upper end portion is continuous with a through hole 40 a formed around the rotation center axis A of the turntable 40, and the lower end portion is supported by the bottom plate 12.

A control unit 50 is incorporated in the housing 11 (FIGS. 1 and 3). The control unit 50
The housing is housed in the housing 11 by utilizing a space around a short bottomed cylindrical guide member 34 disposed around the cylindrical member 13, and a maintenance inspection opening with a lid is formed on the bottom plate 12 side. ing. It is assumed that the inside of the control unit 50 is partitioned into a plurality of independent storage spaces in order to effectively separate a power component handling a large current from a control component handling a small current.

The motor 21 includes an encoder 21 a and a planetary gear mechanism 22 together with a rotation center axis A of the rotary table 40.
And are arranged in parallel. A planetary gear mechanism 22 is connected to a shaft end of the motor 21, and a pinion 22 b is mounted on an output shaft 22 a of the planetary gear mechanism 22. The planetary gear mechanism 22 includes a mounting flange 22c, a bolt 22
.., are stored upward and fixed to the storage portion 11d2 of the partition wall 11d via the d, 22d,.

The rotary table 40 is rotatably mounted on the upper surface of the housing 11 via a bearing 41. The bearing 41 is a self-aligning roller bearing capable of simultaneously applying a thrust load, and has a holding ring 41a, a holding ring 41a, and a holding portion 11d3 formed upward on the partition wall 11d.
It is stored via bolts 41b, 41b. On the upper surface of the turntable 40, a T groove 40b for fixing a work,
Are formed radially. An external gear ring gear 40c is attached to the lower surface of the rotary table 40 via bolts 40d, 40d.
0c meshes with the pinion 22b of the planetary gear mechanism 22. Note that the outer periphery of the rotary table 40 is sealed with the housing 11 via a dust seal (not shown).

Therefore, the rotary table 40 is provided with a T-shaped groove 40.
By attaching an attachment (not shown) via the b, 40b,..., the work can be stacked on the upper surface via the attachment and fixed. Further, when loading a long work, a part of the work can be inserted into the through hole 40a of the rotary table 40 and the cylindrical member 13.

The lock mechanism 30 includes a rotary gear 31 attached to the lower surface of the rotary table 40, a fixed gear 32 fixed to the housing 11, and a ring gear 33 (FIGS. 1 and 2). The rotary gear 31 is formed in a ring shape surrounding the upper part of the cylindrical member 13, and has bolts 31a, 31a,.
The fixed gear 32 is formed in a ring shape through bolts 34a, 34a.
are fixed to the lower surface of the partition wall 11d of the housing 11 together with the guide member 34 via a. The rotating gear 31 and the fixed gear 32 are arranged concentrically with their respective tooth surfaces aligned downward. In addition, the fixed gear 32
By partially overlapping the mounting flange 22c of the planetary gear mechanism 22 via the bolt 22e, the outer periphery is arranged close to the outer periphery of the planetary gear mechanism 22.

The ring gear 33 is vertically slidably mounted between the guide member 34 and the auxiliary member 34b.
The auxiliary member 34b is fixed to the guide member 34 via bolts 34c, 34c. Also, the ring gear 33
Of the rotating gear 31 and the fixed gear 32,
Facing upward. On the lower surface of the ring gear 33, a plurality of guide bolts 34d, 34d,.
A compression spring 34e is mounted between the 4d head and the lower surface of the guide member 34. A chamber 34 is provided between the lower surface of the ring gear 33 and the upper surface of the guide member 34.
f is formed, and the chamber 34f is connected to an external oil pressure source via an oil passage (not shown). The chamber 34f includes seal rings 33a, 33a mounted on the inner and outer circumferences of the ring gear 33, and guide bolts 34d.
Ring 34 incorporated in the guide member 34 corresponding to
g, 34g... are sealed oil-tight.

Therefore, the ring gear 33 is mounted on the chamber 34.
By introducing hydraulic pressure to f and driving it upward, the rotary gear 31 and the fixed gear 32 are meshed in common (FIG. 1), and the rotary table 40 can be locked so as not to rotate. Further, the ring gear 33 extracts the hydraulic pressure from the chamber 34f, and the compression springs 34e, 34e.
By returning downward through d, 34d,..., the engagement with the rotary gear 31 and the fixed gear 32 is released (FIG. 2), and the lock of the rotary table 40 can be released. However, the rotating gear 31, the fixed gear 32, and the ring gear 33
When the numbers of teeth are the same, and the rotary table 40 is locked, the rotating gear 31 stops the fixed gear 32 and the ring gear 33 at the same phase. That is, the lock mechanism 30 includes the rotating gear 31, the fixed gear 3
2. The rotary table 40 can be locked for each tooth pitch determined by the number of teeth of the ring gear 33.

When the lock mechanism 30 releases the lock of the rotary table 40 (FIG. 2), the entirety of the rotary table 40 can be set to the indexing mode.
According to 1, the index can be set to an arbitrary rotation angle via the planetary gear mechanism 22, the pinion 22b, and the ring gear 40c. The rotation angle of the turntable 40 can be electrically accurately set by detecting the rotation angle of the motor 21 by the encoder 21a. Further, when the rotary table 40 is indexed and set to a predetermined rotation angle in this manner, the lock mechanism 30 locks the rotary table 40 so that it cannot rotate (FIG. 1), and can put the entire table into the processing mode.

The control unit 50 has all the control functions necessary for controlling the rotation of the turntable 40 and controlling the lock mechanism 30 in this manner.
Therefore, the control unit 50 can execute a series of operations smoothly by externally supplying a target rotation angle for setting the turntable 40 and an operation command signal.

On the other hand, the housing 11 includes fixing brackets B, B
Can be installed horizontally or vertically (FIG. 4). In the housing 11, the fixing bracket B is screwed so that one leg 11a is sandwiched with respect to the mounting surface F, and the other leg 1 is inserted through the mounting groove 11b.
1a so as to sandwich the mounting bracket F with respect to the mounting surface F.
Can be set upward by rotating the rotary table 40 (FIG. 3A). In addition, the housing 11 can set the rotary table 40 sideways by using the legs 11a and the protruding portions 11c on the rotary table 40 side (FIG. 2B).

Also, the housing 11 is provided with a plurality of sets by providing hydraulic connectors 11e, 11e and electrical connectors 11f, 11f for power supply lines and signal lines on one side (FIG. 5). Can be installed close to each other and installed in parallel, and necessary piping and wiring can be compactly arranged on the same surface.

[0032]

[Other embodiments] Ring gear 33 of lock mechanism 30
Are guide rods 34d, 34d ..., compression springs 34e,
34e... Can be omitted, and can be driven up and down positively via hydraulic pressure (FIG. 6). The ring gear 33 includes a driving member 33
The drive member 33b is mounted on the upper surface of the guide member 34b so as to be vertically slidable between the guide member 34 and the auxiliary member 34b via the seal rings 33a, 33a. On the upper surface of the driving member 33b, a chamber 34f1 is formed between the driving member 33b and the ring-shaped lid member 34h. The cover member 34h is fixed to the fixed gear 3 via bolts 34a, 34a.
2. The ring gear 33 is sandwiched and fixed between the guide members 34, and is fixed via seal rings 34k and 34k.
It can slide up and down between the auxiliary member 34b and the lid member 34h.

The ring gear 33 includes chambers 34f, 34
By alternately introducing hydraulic pressure to f1, the driving member 33
b, it can be driven up and down positively, and can be raised and meshed with the rotating gear 31 and the fixed gear 32 in common, and lowered and disengaged with the rotating gear 31 and the fixed gear 32.

In the lock mechanism 30, the ring gear 33 is mounted on the housing 11 via the diaphragm 35 so as not to rotate relative to the housing 11, and the fixed gear 32 can be omitted (FIG. 7). The ring gear 33 is attached to the upper surface inner diameter side of the diaphragm 35, and the diaphragm 35 is fixed to the lower surface of the partition wall 11d of the housing 11 together with the guide member 34 via bolts 34a, 34a. In addition, a ring-shaped spacer 35 a is attached to the inner diameter side of the lower surface of the diaphragm 35. Guide member 3
4. Seal rings 33a, 3
A driving member 33b is vertically slidably inserted through the intermediary of the driving member 3a.
A protruding ridge 33b1 is formed to abut on a.

The ring gear 33 is provided with a driving member 33b and a spacer 35 by introducing hydraulic pressure into the chamber 34f.
a, the rotary table 40 can be locked by being driven upward through the diaphragm 35 to mesh with the rotary gear 31. The ring gear 33 extracts hydraulic pressure from the chamber 34f and returns the driving member 33b downward through the compression springs 34e, 34e..., Guide bolts 34d, 34d. The engagement can be released, and the lock of the rotary table 40 can be released.

The lock mechanism 30 may use a rotary pad 37, a fixed pad 38, and a ring pad 39 instead of the rotary gear 31, the fixed gear 32, and the ring gear 33 (FIG. 8). The rotating pad 37 and the fixed pad 38 are fixed to the rotating table 40 and the partition wall 11d via supporting members 37a and 38a, respectively, and the ring pad 39 is attached to the upper surface of the driving member 33b. The ring pad 39 can lock the rotary table 40 by introducing hydraulic pressure into the chamber 34f and pressing the rotary pad 37 and the fixed pad 38 in common via the driving member 33b. , The lock of the turntable 40 can be released.

The ring pad 39 is mounted on the housing 11 via the lock pin 39b so as to be relatively non-rotatable, and the fixing pad 38 can be omitted (FIG. 9). The lock pin 39b having the lock nut 39b1 has a tip engaged with a guide groove 33b2 formed on the outer peripheral surface of the drive member 33b. Therefore, the ring pad 39 is driven by the driving member 33b.
The rotary table 40 can be locked by being brought into pressure contact with the rotary pad 37 via the rotary member 37, and can be unlocked by lowering the rotary table 40 through the driving member 33b. This is because the lock pin 39b restrains the driving member 33b from rotating via the guide groove 33b2 and allows vertical movement.

In FIGS. 7 to 9, the driving member 33b is positively driven up and down via hydraulic pressure in accordance with FIG. 6, and guide rods 34d, 34d.
34e ... may be omitted.

The chambers 34f, 34f1 may be supplied with air pressure instead of hydraulic pressure. The bearing 41 supporting the rotary table 40 may be of any other type as long as it withstands a predetermined thrust load and has a predetermined rotation accuracy, or uses a metal bearing having an appropriate lubrication method. May be.

Further, the motor 21, the planetary gear mechanism 22
May be connected via an appropriate gear mechanism, timing belt mechanism or the like instead of being directly connected.

[0041]

As described above, according to the present invention, a motor and a planetary gear mechanism are built in a box-shaped housing, and the motor is disposed parallel to the rotation center axis of the rotary table. Since a worm gear mechanism with low power transmission efficiency is not used, the whole device including the motor can be compactly integrated and has an excellent effect that it can be easily incorporated into a machine tool.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the entire configuration.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a schematic plan view

FIG. 4 is an explanatory view of a use state (1).

FIG. 5 is an explanatory view of a use state (2).

FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment (1).

FIG. 7 is an enlarged sectional view of a main part showing another embodiment (2).

FIG. 8 is an enlarged sectional view of a main part showing another embodiment (3).

FIG. 9 is an enlarged sectional view of a main part showing another embodiment (4).

[Explanation of symbols]

 A: rotation center shaft 11: housing 13: cylindrical member 21: motor 22: planetary gear mechanism 30: locking mechanism 31: rotating gear 32: fixed gear 33: ring gear 35: diaphragm 37: rotating pad 38: fixed pad 39: ring pad 39b: Lock pin 40: Rotary table 40a: Through hole 50: Control unit

Claims (7)

[Claims] 1. A box-shaped housing, a motor and a planetary gear mechanism incorporated in the housing, and a rotary table rotatably mounted on the housing and connected to the motor via the planetary gear mechanism. And the motor is
Disposed in parallel to the rotation center axis of the turntable,
A rotary table for a machine tool, wherein the rotary table is lockable via a lock mechanism. 2. The lock mechanism according to claim 1, wherein the lock mechanism includes a rotary gear attached to the rotary table, a fixed gear fixed to the housing, and a ring gear commonly meshed with the rotary gear and the fixed gear. Item 4. A rotary table for a machine tool according to item 1. 3. The lock mechanism according to claim 1, further comprising: a rotary gear attached to the rotary table; and a ring gear mounted to the housing via a diaphragm so as to be relatively non-rotatable, and meshed with the rotary gear. Item 4. A rotary table for a machine tool according to item 1. 4. The lock mechanism includes a rotary pad attached to the rotary table, a fixed pad fixed to the housing, and a ring pad commonly pressed against the rotary pad and the fixed pad. A rotary table for a machine tool according to claim 1. 5. The lock mechanism comprises a rotary pad attached to the rotary table, and a ring pad mounted on the housing via a lock pin so as to be relatively non-rotatable and pressed against the rotary pad. The rotary table of a machine tool according to claim 1, wherein 6. The rotary table according to claim 1, wherein the rotary table has a through hole formed around a rotation center axis, and the housing has a cylindrical member connected to the through hole. The rotary table of a machine tool according to any one of the above. 7. The rotary table of a machine tool according to claim 1, wherein the housing has a control unit built therein.