JPS639923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turret unit for a turret type machine tool.

Conventionally, as a tower unit as mentioned above,
There is a device that mechanically links the rotational indexing of the turret head, positioning with a pin, and clamping operation with a clamper, but the conventional device has a complicated structure such as the mechanism for advancing and retracting the pin and the operating mechanism of the clamper. There was also the problem of large size.

The present invention solves the above-mentioned problems of the prior art, and enables the rotational indexing and positioning clamping of the turret head to be mechanically interlocked to quickly, reliably, and highly accurately perform the rotational indexing and positioning clamping. It is an object of the present invention to provide a turret unit whose mechanism for performing positioning clamping can be made relatively simple and compact.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a unit body of a turret unit.A quill 2 is supported on this unit body 1 so as to be movable forward and backward, and a support stand 3 is fixed to the tip of the quill 2 protruding from the front end of the unit body 1. A turret head 4, which will be described later, is attached to the stand 3. A feed screw 5 is parallel to the quill 2.
is rotatably supported by the unit main body 1 while being restrained from advancing or retreating, and the feed screw 5 is configured to be driven in forward and reverse directions by a feed control motor 6 fixed to the unit main body 1. In addition, the feed screw 5
The feed nut 7 is screwed into the feed nut 7.
A bracket 7a provided integrally with the quill 2 is engaged with the quill 2. A main shaft 8 passes through the quill 2 so as to be rotatable and restrained from advancing or retreating, and rotational force is transmitted to the main shaft 8 from a main shaft drive motor 9 fixed to the unit main body 1.

As shown in FIGS. 1 and 2, a fixed shaft 10 is provided within the support base 3, and the fixed shaft 10 is connected to the quill 2.
and is inclined at a predetermined angle with respect to the main axis 8. A cylindrical portion 11a of a Geneva gear 11 is supported on the fixed shaft 10 so as to be rotatable about the fixed shaft 10 and movable in the axial direction thereof, and the turret head 4 is fixed to the cylindrical portion 11a. A gear coupling 13 consisting of a pair of removable ring gears is provided on the lower surface of the turret head 4 and the upper surface of the support base 3. 11 is pressed downward so that the turret head 4 is positioned and clamped by the gear coupling. Further, six tool holders 14 are arranged at equal intervals in the circumferential direction on the inclined surface of the outer surface of the turret head 4, and a tool 15 is removably inserted into the tool holder 14, and rotational force is transmitted to the tool 15. Transmission shaft 1
6 is provided. Note that only one set of the tool holder 14, tool 15, and power transmission shaft 16 is illustrated, and the others are omitted from the illustration. The transmission shaft 16 of the tool holder 14 indexed to the machining position is aligned in the axial direction with the main shaft 8. A clutch 17 is fitted to the distal end of the main shaft 8 inserted into the support base 3 so as to be movable in the axial direction and restrained from rotation. It can engage with the transmission shaft 16 in the extended position. The unit main body 1 includes a guide sleeve 3a whose one end is fixed to the support base 3.
Alternatively, the guide sleeve 3a is fitted parallel to the quill 2, and the indexing shaft 1a is supported in parallel with the quill 2. It is becoming more and more driven. A bevel gear 21 is fitted and fixed to the tip of the indexing shaft 1a, and the bevel gear 21 is supported within the support base 3. The bevel gear 22 that meshes with the bevel gear 21 is the indexing operation shaft 23
The operating shaft 23 is fitted and fixed within the support base 3. As shown in Figures 2 and 3,
A drive arm 24 and a drive gear 25 are fitted and fixed to the indexing operation shaft 23, and an engagement roller 24a pivoted to the tip of the drive arm 24 is removably engaged with the Geneva gear 11. It's becoming like that. That is, the Geneva gear 11 is arranged at 6 equal angular intervals.
A radial groove 11b of the book and an arcuate groove 11c located between these are formed, and by rotation of the operating shaft 23, the base end of the drive arm 24 shown in FIG. The drive arm 24
When rotated by 360 degrees, this arm 24 has a predetermined play, and the engagement roller 24a engages with the radial groove 11b to rotate the Geneva gear 11 by 60 degrees, so that the base end of the drive arm 24 engages with the Geneva gear 11. It fits into the next arcuate groove 11c. The drive gear 25 is engaged with a lift gear 26, and the lift gear 26 is rotatably fitted to the fixed shaft 10 in contact with the Geneva gear 11 below, and a cam surface 26a for turret head drift is formed on the lower surface of the lift gear 26. A cam plate 27 whose cam surface 26a is fixed to the fixed shaft 10
is supported by The gear ratio of the drive gear 25 and the lift gear 26 is set to 1:3, and the cam surface 26a of the lift gear 26 has a raised part A at three locations on the circumference and a raised part A on both sides of the raised part A, as shown in FIG. Play parts C, C are formed via the inclined parts B, B. The first gear 46 fixed to the lift gear 26 meshes with the second gear 28 shown in FIG. 4, and the bevel gear 30 fitted and fixed to the shaft 29 of the second gear 28 meshes with the bevel gear 31, the latter A gear 33 fitted onto a shaft 32 to which a bevel gear 31 is attached is movable in the axial direction but rotationally restrained, is supported on the unit main body 1, and a gear 34 shown in FIG. 1 is meshed with this gear 33. , the gear 34 is fitted and fixed to a stopper shaft 35. The stopper shaft 35 is rotatably supported by the unit body 1, and six stopper pins 37 are arranged at equal intervals in the circumferential direction on a disk 36 fixed to the stopper shaft 35. One stopper pin 37 corresponding to the extended and indexed tool holder 14 is brought into contact with a bracket 7a provided integrally with the feed nut 7. Furthermore, Figures 2 and 4
As shown in the figure, a clutch operation shaft 3 is attached to the support base 3.
8 is rotatably provided, and a clutch operating lever 39 fixed to a clutch operating shaft 38 is connected to the clutch 17.
An outer lever 47 fixed to the clutch operating shaft 38 is brought into contact with a stopper bolt 40 shown in FIG. When the quill 2 is in the retracted position, the clutch 1
7, it is separated from the transmission shaft 16. A rod 41 with one end fixed to the support base 3 extends into the unit body 1, and a detector 43 is provided opposite to a magnetic scale 42 provided on the rod 41, and a detection signal from these is used to control the feed control motor 6. By controlling the rotation angle and rotation speed, the feed speed and position of the turret head 4 are controlled. Also, the fourth
In the figure, numeral 45 is an encoder for confirming the indexing of the turret head, which is disposed opposite to the stopper shaft 35.

Next, the indexing operation by the turret unit configured as above will be explained. With the quill 2 and support stand 3 in the retracted state shown in FIGS. 1 and 2, the motor 20 with an indexing reducer is driven, and the indexing operation shaft 23 is rotated 360 degrees via the indexing shaft 19 and bevel gears 22, 22. When rotated by °, the indexing operation shaft 23
The lift gear 26 rotates due to the rotation of the drive gear 25 provided in the cam surface 26a of the lift gear 26.
and the cam plate 27 fixed to the fixed shaft 10,
The lift gear 26, Geneva gear 11 and turret head 4 rise against the clamping spring 12, and the gear coupling 13 is disengaged. Along with this, the drive arm 2 provided on the indexing operation shaft 23
4 rotates, and by rotating the raised Geneva gear 11 by 60 degrees, the turret head 4 is rotated by a unit angle, and the tool holder 14 next to the tool holder 14 that was positioned to coincide with the axis of the spindle 8 before rotation is rotated. The machining position is indexed to a machining position where the axis line coincides with the axis line of the main spindle 8.

Further, as the lift gear 26 rotates, the first gear 46, the second gear 28, and the shaft 2, which are integral with the lift gear 26, are rotated.
9, bevel gears 30, 31, shaft 32, gears 33, 3
4 and the stopper shaft 35, the disk 36 is rotated by an equal angle to the turret head 4, and the stopper pin 37 corresponding to the indexed tool holder is indexed to a position facing the bracket 7a integral with the feed nut 7. In this state, the clamping spring 12
Due to the restoring force, the turret head 4 and the members raised together with it descend, and the gear coupling 1
3 are engaged and positioned and clamped. After that, the indexing reduction gear motor 20 stops. In addition,
The above-mentioned lifting and lowering operations and indexing rotations of the turret head 4 and the like can be carried out at appropriate timings without any hindrance because play is provided in the lifting and lowering operations by the cam surface 26a of the lift gear 26 and in the rotational movements of the drive arm 24. This is done mechanically.

Next, the feed screw 5 is rotated by normal rotation of the feed control motor 6, and the quill 2 and the support base 3 are advanced through the feed nut 7 and the bracket 7a, and the main shaft drive motor 9 is driven. In this way, as the quill 2 moves forward, the main shaft 8 also moves forward, and the clutch 17 moves forward against the clutch spring 18 and engages with the transmission shaft 16 of the tool holder 14 in the machining position. Therefore, the tool 15 rotates via the main shaft 8, clutch 17, and transmission shaft 16, and the workpiece is machined by this tool. Further, as the feed nut 7 moves forward, the bracket 7a comes into contact with the stopper pin 37, and each member will no longer be able to move forward. Furthermore, when the feed nut 7 and bracket 7a are moved backward through the feed screw 5 by reversing the feed control motor 6, each member that has moved forward moves back and returns to the position shown in FIGS. 1 and 2.
Since the state before the operation shown in the figure is restored, the feed control motor 6 and the spindle drive motor 9 are stopped, and the above-mentioned operations are repeated, and the workpiece is moved with the tools installed in different tool holders as appropriate. processing.

In addition, in the above-mentioned embodiment, a quill and a support stand are used that are moved forward and backward using a feed nut by the rotation of a feed screw, but in place of the quill and support stand, the present invention uses a movement member that moves forward and backward by an appropriate means. Can be done.

As explained above, the turret unit of the present invention rotates the lift gear on which the cam surface is formed by the rotation of the indexing shaft, moves the turret head in the axial direction, and detaches the gear coupling. In this state, the Geneva gear is rotated by a predetermined angle by the rotation of the indexing shaft to index the turret head, and then the gear coupling is engaged by the restoring force of the clamping spring provided in the turret head to position and clamp it. As a result, the series of operations of unclamping the turret head, rotation indexing, and positioning clamp can be mechanically performed quickly and reliably.In addition to being able to perform highly accurate indexing operations, it is also possible to Since the mechanism for extracting and positioning and clamping is provided centrally around the rotation center of the turret head, the structure can be made compact and simple.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a turret unit according to an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the support stand and turret head portion, and Fig. 3 is taken along the - line in Fig. 2. 4 is a partially cutaway enlarged side view showing the front part of the turret unit in FIG. 1, and FIG. 5 is a partially exploded view of the cam surface of the lift gear. 1... Unit main body, 2 and 3... Quill and support stand (advance/retreat member), 4... Turret head,
5...Feed screw, 6...Feed control motor, 7...
...Feed nut, 7a...Bracket, 8...Main shaft, 9...Main shaft drive motor, 10...Fixed shaft of turret head, 11...Geneva gear, 12...Clamp spring, 13...Gear coupling, 14 ...Tool holder, 15...Tool, 16...
...Transmission shaft, 17...Clutch, 18...Clutch spring, 19... Indexing shaft, 20... Motor with indexing reducer, 23... Indexing operation shaft, 24... Drive arm, 25... Drive gear, 26...lift gear.

Claims (1)

[Claims] 1 A unit main body, a reciprocating member that is supported by the unit main body and is moved forward and backward, and a reciprocating member that is supported so as to be rotatable around a fixed axis that is inclined with respect to the axial direction of the reciprocating member and reciprocated in the axial direction, and that is A gear coupling consisting of a turret head on which tools are mounted at equal intervals in the direction, a pair of ring gears provided between the turret head and the reciprocating member and removably engaged, and rotating around the fixed shaft. a lift gear that is rotatably supported and has a cam surface for turret head drift formed at one end; a Geneva gear for indexing that is rotatably supported around the fixed shaft and fixed to the turret head; and an indexing gear that is rotationally driven. a drive gear connected to the indexing shaft and meshing with the lift gear; a drive arm connected to the indexing shaft and engaged to index and rotate the Geneva gear; and a gear cup provided within the turret head. It is equipped with a clamping spring that biases the ring in the engagement direction, and a clutch that is provided at the tip of the spindle and removably engages with the tool side at the processing position to transmit rotational force to the tool. A tower unit characterized by: