JPH08206903A - Turret head unit - Google Patents

Abstract

PURPOSE: To realize a new dividing mechanism which can make the whole of a turret head unit smaller and lighter and shorten a dividing time by improving a driving system for a clutch mechanism and a positioning section in the structure of a turret head. CONSTITUTION: The rotation of a dividing motor 4 is converted into a quarter rotary action rotating at fixed timing by parallel cams 44, 45 for rotating a rotary head 2, and moreover into the movements of a clutch ring 35 and a locating pin 56 from the first rotating shaft 43 through an action converting section 6, which is a composite cam structure section composed of two mutually opposite end cams and cam followers, and can be made smaller and lighter and can carry out dividing at high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turret head unit, and more particularly to a structure of a clutch and a power transmission drive mechanism for positioning in an indexing mechanism of a rotary head portion of a turret head.

[0002]

2. Description of the Related Art Conventionally, a turret head for machining has a rotary head portion having a plurality of spindle portions which are rotatably attached to a support shaft of a processing machine main body. The spindle can be selectively connected to the spindle by the movement. Different tools can be attached to the respective spindle parts, and with the above configuration, the tools can be appropriately replaced and machined according to the product shape.

Inside the turret head, there is provided a head indexing mechanism for positioning the spindle portion so as to correspond to the spindle drive shaft, and a clutch mechanism for connecting and disconnecting the selected spindle portion and the spindle drive shaft.
There are various methods for the head indexing mechanism, such as a method of rotationally positioning with a parallel cam, a roller gear cam, and a servo motor. For example, an indexing motor for driving the turning head to rotate, A rotation conversion unit that converts a predetermined rotation of the output motor into a rotation corresponding to the formation angle of the spindle unit,
A sensor for detecting the turning position of the turning head unit and a positioning unit including a locate pin for holding and fixing the turning position of the turning head unit with respect to the turret head body are provided.

When changing the spindle part connected to the spindle drive shaft, first, the clutch drive mechanism disconnects the spindle drive shaft from the spindle part, and then the head indexing mechanism drives the rotating head part. To do. The rotary head unit converts the rotation of the indexing motor by the rotary conversion unit, and is rotated until the desired spindle unit comes to the corresponding position of the spindle drive shaft. After that, the rotation is stopped, the position is confirmed by the sensor, and the rotating head is positioned and fixed to the head main body by the positioning portion. Finally, the clutch drive connects the spindle drive shaft and the newly selected spindle unit.

[0005]

In the turret head using the conventional parallel cam, in addition to the rotary drive system for indexing and the rotary drive system of the spindle drive shaft, a clutch mechanism and an indexing mechanism are provided. Since the pneumatic or hydraulic actuator for operating the positioning section of is often provided, the entire unit weighs 250 kg or more, which makes it difficult to miniaturize and reduce the weight, and has a long indexing time and high-speed operation. There was a problem that it was difficult to do.

Therefore, the present invention solves the above problems, and by improving the drive system of the clutch mechanism and the positioning portion, it is possible to reduce the size and weight of the entire unit and shorten the indexing time. It is to realize a new all-cam type turret head unit.

[0007]

Means for Solving the Problems The measures taken by the present invention in order to solve the above-mentioned problems include a rotating head portion provided rotatably with respect to a support shaft and provided with a plurality of spindle portions,
A head indexing mechanism having a positioning means for rotating the rotating head part to define the rotating position so that the spindle drive shaft corresponds to one of the spindle parts, and to hold the rotating position; A turret head unit having a clutch mechanism for connecting / disconnecting a rotational connection between the spindle drive shaft and the spindle section, wherein the head indexing mechanism rotates in synchronization with a rotary drive system for rotating the rotary head section. Is provided, and a motion conversion unit having first and second drive cams that respectively operate by the rotation obtained from the synchronous rotation extraction unit, and the first cam and the clutch mechanism are provided. The second cam and the positioning means are interlocked with each other.

Here, it is preferable that the synchronous rotary take-out portion is a rotary portion that makes one rotation when the rotary head portion is rotated by a forming cycle of the spindle portion in the rotary drive system.

In this case, it is preferable that the synchronous rotation take-out portion is an input shaft of a parallel cam which is configured such that the output shaft rotates by the rotation period of the spindle portion for one rotation of the input shaft. .

Further, the motion converting portion is an end face cam having the cam surfaces in which the first cam and the second cam are connected to the same input shaft and face each other, and the inner and outer surfaces 2 intersecting the input shaft. A composite cam structure provided with first and second cam followers respectively connected to the output shafts of a multiple structure, and either the inner or outer output shaft connected to the first cam follower is connected to the clutch mechanism. However, it is preferable that the other output shaft connected to the second cam follower is connected to the positioning means.

[0011]

According to the present invention, synchronous rotation is taken out from the rotary drive system, and the clutch mechanism and the positioning means are interlocked with the first and second drive cams which are respectively operated by the rotation, whereby the head splitting is performed. Since all the moving parts at the time of output can be driven by a single rotary drive system and the clutch mechanism and the positioning means can be driven only by the cam mechanism, the unit can be made compact and lightweight. , It is possible to secure a reliable operation and shorten the indexing time.

According to the second aspect of the present invention, the synchronous rotation take-out portion is a rotating portion that makes one rotation when the rotating head portion in the rotating drive system is rotated by the forming cycle of the spindle portion, thereby providing a clutch mechanism or Since the drive cam of the positioning mechanism can be driven as it is, the mechanism system can be simplified, so that the unit can be made smaller and lighter.

According to the third aspect of the present invention, since the parallel cam is used, the indexing mechanism can be entirely configured by the cam and the lever while ensuring the necessary intermittent operation, so that the size and weight can be further reduced and the indexing speed can be increased. Can be promoted.

According to the fourth aspect of the present invention, the composite cam structure portion is used as a cam operating portion formed by combining a pair of end surface cams,
Since the driving force transmitting portion composed of the inner and outer output shafts can be integrally formed, the motion converting portion can be extremely easily reduced in size and weight.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of a turret head unit according to the present invention will be described with reference to the drawings. FIG. 1 shows the entire turret head unit of this embodiment.
The unit body 1 is provided with a rotatable head portion 2, which is rotatably provided, a spindle motor 3, and an indexing motor 4.

The rotating head unit 2 has four spindle units 21, 22, 23, 2 arranged evenly in the rotating direction.
4 is attached, and any one of these spindle units is rotationally driven by the spindle motor 3. In the structure shown in FIG. 1, the spindle portion 21 is connected to a spindle drive shaft (not shown) and rotates at high speed.

The rotary head unit 2 is adapted to rotate with respect to the unit main body 1 by an indexing motor 4. As shown in FIG. 2, the rotation of the indexing motor 4 causes the first rotating shaft 43 to rotate via the gears 41 and 42. A dog 71 is attached to the first rotating shaft 43, and a proximity switch 72 facing the dog 71 detects the reference position of the first rotating shaft 43 for one rotation.

The rotation of the first rotating shaft 43 is performed by the parallel cam 4
Due to the engagement of 4 and 45, the second rotation shaft 43 is rotated so as to make 1/4 rotation at a predetermined timing within one rotation period of the first rotation shaft 43.
It is transmitted to the rotary shaft 46. The rotation of the second rotary shaft 46 is transmitted to the third rotary shaft 49 by the bevel gears 47 and 48, and the gear 5
The rotary head unit 2 is rotated around the support shaft 52 from 0 through the gear 51 by exactly the distance between the spindle units.

A pair of dogs 73 and 74 are attached to the outer circumference of the rotary head portion 2 at positions corresponding to the respective spindle portions 21, 22, 23 and 24.
The limit switches 75 and 76 respectively detect which of the spindle parts is connected to the spindle drive shaft. The dogs 73 and 74 indicate spindle addresses having a 2-bit information amount because two types (H and L) corresponding to ON / OFF of the limit switches 75 and 76 are provided in different combinations for each spindle unit. The four spindles can be discriminated from each other by the combination of the dogs.

The portion that drives the spindle 21 to rotate is
As shown in FIG. 3, from the spindle motor 3 to the pulley 3
1, the spindle drive shaft 34 is rotated via the belt 32 and the pulley 33. The spindle drive shaft 34 meshes with a spindle shaft 36 supported by the spindle portion 21 while being held by the clutch portion 35. The clutch portion 35 is configured to be movable in the axial direction of the spindle drive shaft by a clutch drive lever 38 attached to the first drive shaft 37, and the movement of the clutch portion 35 in the axial direction causes the spindle drive shaft 34 and the spindle to move. The shaft 36 meshes with or disengages.

As shown in FIG. 2, the rotation of the first rotating shaft 43 is introduced into a motion converting portion 6 which will be described later and converted into a predetermined rotating motion, whereby the first drive shaft 37 and the second drive shaft 67 are separated. It is designed to rotate. The first drive shaft 37 rotates the clutch drive lever 38 to move the clutch portion 35 in the axial direction of the spindle drive shaft, thereby disengaging the clutch mechanism. The second drive shaft 67 is a tubular member that is attached concentrically with the first drive shaft 37, and operates separately from the first drive shaft.

The locate drive lever 5 is attached to the second drive shaft 67.
5 is attached, and the locate drive lever 55 is connected to the locate pin 56. The locate pin 56 is constantly urged toward the projecting side by a coil spring 68 mounted elastically on the unit body 1 and fits into the locate bush 25 provided in the rotating head portion 2 by the rotation of the locate drive lever 55. It is like this. Locate pin 56
The proximity switch 77 is arranged to face the accommodation part of
The retracting operation of the locate pin 56 can be confirmed.

4 and 5 show the internal mechanism of the motion converting section 6 shown in FIG. As shown in FIG. 4, the first rotating shaft 4
The first rotating shaft 43 connected to
2 and 63 are mounted so that their cam surfaces 62a and 63a face each other, and are rotated together with the first rotating shaft 43. The first drive shaft 37 is arranged so as to intersect with the first rotation shaft 43.
A driven member 65 is attached to the. The driven member 65 is provided with a cam follower 65a.
By engaging the cam surface 62a of the end cam 62,
The first drive shaft 37 is rotated by a predetermined angle at a predetermined timing.

The second drive shaft 67 is coaxially supported by the first drive shaft 37. The driven member 6 is attached to the second drive shaft 67.
6 is attached to the driven member 66, and the end face cam 63 is attached to the driven member 66.
A cam follower 66a that engages with the cam surface 63a is provided. The cam follower 66a rotates the driven member 66 by a predetermined angle at a predetermined timing as the first rotating shaft 43 rotates.

As shown in FIG. 5, a clutch drive lever 38 is fixed to the first drive shaft 37, and a locate drive lever 55 is fixed to the second drive shaft 67. These clutch drive levers 38, 55 are It operates by the rotation of the first drive shaft 37 and the second drive shaft 67. The other end of the coil spring 39 having one end fixed is attached to the clutch drive lever 38, and the clutch drive lever 38 is always urged by the clutch portion 35 in the direction in which the clutch is connected.

The operation of this embodiment described above is shown in FIG.
5 to FIG. 5 together with FIG. When replacing the spindle part of the turret head, first replace the
At the same time as stopping the work movement of the processing machine as shown in the NC feed column of (S), the spindle motor 3 is set to 50
Switching to low speed rotation of about rpm (L), indexing motor 4
(R) is activated. When the indexing motor 4 starts rotating,
The rotation of the first rotating shaft 43 causes the end surface cam 6 shown in FIG.
2 rotates the driven member 65 and the first drive shaft 37 via the cam follower 65a, and the clutch drive lever 3 shown in FIG.
8 is rotated to move the clutch portion 35. When the clutch portion 35 moves in the axial direction of the spindle drive shaft, the clutch mechanism is disengaged (O), and the spindle drive shaft 3 shown in FIG.
4 and the spindle shaft 36 are disengaged.

Next, the rotation of the first rotation shaft 43 causes the end face cam 63 shown in FIG. 4 to rotate the driven member 66 and the second drive shaft 67 via the cam follower 66a, and the locate drive lever 55 shown in FIG. 2 to rotate the locate pin 56 to the position shown in FIG.
Pull out from the locate bush 25 shown in (O). After that, the parallel cams 44, 4 are rotated by the rotation of the first rotation shaft 43.
The second rotating shaft 46 is rotated via 5, and the bevel gears 47, 4
The rotating head unit 2 is rotated via the third rotation shaft 49, the gear 50, and the gear 51 (R).

When the rotating head unit 2 is rotated up to the adjacent spindle unit, the indexing motor 4 has the first rotating shaft 43.
The second rotating shaft 46 rotates 1/4 rotation during one rotation of the, so that the rotating head portion 2 is rotated by 90 degrees and stopped.
When the rotating head unit 2 is rotated 180 degrees to the opposing spindle unit, the process shown in FIG. 6 is repeated twice by rotating the first rotating shaft 43 twice.

When the first rotating shaft 43 reaches the end of one rotation, the end cam 63, the driven member 66, the second drive shaft 67,
The locate pin 56 is fitted into the locate bush 25 via the locate drive lever 55 (T), and the rotating head unit 2
Position and fix. In addition, the end surface cam 62 and the driven member 6
5. When the clutch portion 35 is returned via the first drive shaft 37 and the clutch drive lever 38, the spindle drive shaft 34 and the spindle shaft 36, which are rotating at a low speed, are engaged and connected. The low speed rotation of the spindle motor 3 is for obtaining the meshing of the clutch, and is set by appropriately adjusting the rotation speed according to conditions such as the inertia of the spindle.

When the spindle address detected based on the detection signals of the limit switches 75 and 76 shown in FIG. 2 is for the desired spindle portion, the indexing motor 4 rotates the first rotating shaft 43 once, It is stopped based on the signal from the proximity switch 72 (S). In this case, a signal A obtained from the proximity switch 72 indicating that the first rotation shaft 43 has rotated once, a signal B obtained from the proximity switch 77 indicating the fitting of the locate pin 56, and a signal obtained from the proximity switch 78 shown in FIG. When all the signals C indicating the connection of the clutch mechanism are obtained, the spindle motor 3 returns to the high speed rotation (R), the NC feed starts moving, and cutting is performed.

When it is necessary to rotate the rotary head portion 2 by 180 degrees, the indexing motor 4 is not stopped,
Therefore, the spindle motor 3 maintains the low-speed rotation as it is, and the above-mentioned steps are repeated again for other operating parts.

As described above, according to this embodiment,
Since the rotating head unit 2 is rotated by the rotation of the indexing motor 4 via the parallel cam, and the cam unit drives the clutch unit and the positioning unit by the locate pin, the structure of the indexing mechanism is simplified. It is possible to reduce the size and weight of the turret head. As a result of making a prototype of this example, the present unit weight is 25
While there were many turret heads of 0 kg or more, the unit weight could be suppressed to 120 kg or less. Further, since the movement converting portion 6 has been successfully downsized while ensuring the reliable operation by the combination of the end face cams, the downsizing of the entire turret head, particularly the unit main body portion can be greatly promoted.

Further, in this embodiment, since the entire mechanism of the main operating portion is constituted by the cam and the lever as described above, the reliability of the operation can be enhanced and the moment of inertia of the operating portion can be greatly reduced. Therefore, the indexing time can be greatly shortened. In the prototype of this example, the indexing time which was conventionally 1 second or more could be shortened to 0.5 second.

In the above embodiment, the hemispherical rotary head has four
Although one spindle unit is provided, the present invention is not limited to this, and an arbitrary number of spindle units may be provided on the rotating head unit having a different shape such as a cylindrical shape or a polygonal column shape. Further, in the present embodiment, the dog clutch is used as the clutch, but any other known clutch mechanism can be used as long as it can reliably perform the intermittent rotation.
Further, although the locate pin is used for positioning and fixing in the present embodiment, other positioning means such as a curvic coupling may be used. Further, although the parallel cam is used in the above embodiment, other intermittent operation mechanism,
For example, a known means such as a roller gear or a Geneva mechanism may be used.

[0035]

As described above, the present invention has the following effects.

According to the first aspect of the present invention, synchronous rotation is extracted from the rotary drive system, and the clutch mechanism and the positioning means are interlocked with the first and second drive cams that operate by the rotation, respectively. Since all the moving parts at the time of output can be driven by a single rotary drive system and the clutch mechanism and the positioning means can be driven only by the cam mechanism, the unit can be made compact and lightweight. , It is possible to secure a reliable operation and shorten the indexing time.

According to a second aspect of the present invention, the synchronous rotation take-out portion is a rotating portion that makes one rotation when the rotary head portion in the rotary drive system is rotated by the forming cycle of the spindle portion, thereby providing a clutch mechanism or Since the drive cam of the positioning mechanism can be driven as it is, the mechanism system can be simplified, so that the unit can be made smaller and lighter.

According to the third aspect, since the parallel cam is used, the indexing mechanism can be entirely constituted by the cam and the lever while ensuring the necessary intermittent operation, so that the size and weight can be further reduced and the indexing speed can be increased. Can be promoted.

According to the fourth aspect of the present invention, the composite cam structure portion comprises a cam operating portion formed by a combination of a pair of end surface cams,
Since the driving force transmitting portion composed of the inner and outer output shafts can be integrally formed, the motion converting portion can be extremely easily reduced in size and weight.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of an embodiment of a turret head unit according to the present invention.

FIG. 2 is a mechanism diagram showing an indexing mechanism of a rotating head unit in the embodiment.

FIG. 3 is a mechanism diagram showing a rotary drive system of a spindle unit in the embodiment.

FIG. 4 is a mechanism diagram showing a configuration of a motion conversion unit in the embodiment.

FIG. 5 is a diagram showing an operation conversion unit to a clutch unit in the embodiment.
It is a mechanical diagram showing a configuration up to a positioning unit.

FIG. 6 is a timing chart showing the operation of each unit of the embodiment.

[Explanation of symbols]

 1 Unit body 2 Rotating head part 21, 22, 23, 24 Spindle part 3 Spindle motor 4 Indexing motor 25 Locate bush 34 Spindle drive shaft 35 Clutch part 36 Spindle shaft 37 First drive shaft 38 Clutch drive lever 55 Locate drive lever 55 43 first rotating shaft 44, 45 parallel cam 46 second rotating shaft 56 locate pin 67 second drive shaft 62, 63 end surface cam 62a, 63a cam surface

Claims (4)

[Claims] 1. A rotating head portion provided so as to be rotatable with respect to a support shaft, the rotating head portion having a plurality of spindle portions, and the spindle driving shaft is attached to one of the spindle portions by rotating the rotating head portion. A head indexing mechanism having a positioning means for correspondingly defining the rotational position and holding the rotational position; and a clutch mechanism for connecting and disconnecting the rotational connection between the spindle drive shaft and the spindle portion. In the turret head unit, the head indexing mechanism includes a synchronous rotation take-out portion that takes out rotation synchronized with a turning drive system that turns the turning head portion, and a rotation obtained from the synchronous rotation take-out portion. An operation conversion unit having first and second driving cams that operate respectively is provided, and the first cam and the clutch mechanism are interlocked with each other, and the second cam and the positioning means are interlocked with each other. Turret head unit characterized by and. 2. The synchronous rotation take-out portion according to claim 1, wherein the synchronous rotation take-out portion is a rotary portion that makes one rotation when the rotary head portion is rotated by a formation cycle of the spindle portion in the rotary drive system. Turret head unit. 3. The input shaft of a parallel cam according to claim 2, wherein the synchronous rotation take-out portion is configured so that the output shaft rotates by a forming cycle of the spindle portion for one rotation of the input shaft. A turret head unit characterized by that. 4. The motion conversion unit according to claim 1,
The first cam and the second cam are end surface cams that are connected to the same input shaft and have cam surfaces facing each other, and the first and second cams are respectively connected to output shafts of an inner-outer double structure intersecting the input shaft. 1 is a composite cam structure provided with a second cam follower, one of the inner and outer output shafts connected to the first cam follower is connected to the clutch mechanism, and the other is connected to the second cam follower. A turret head unit, wherein the output shaft of the above is connected to the positioning means.