JPS635211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant angle stop device for a spindle.

For example, in the rotary station machines commonly used today, the fixture for holding the workpiece is fixed to the rotary table, and therefore the machining at each processing station is limited to cutting-edge rotating type machining, such as turning and other machining. It is said that so-called work rotation type machining such as thread cutting is completely impossible.

Therefore, the inventor of the present invention has previously developed a new rotary station machine that enables rotating workpiece machining, which was previously considered impossible, and has already filed an application for the same.

This rotary station machine has multiple driving fixtures installed at equally divided positions on the rotary table.
Each station position at the bottom of the rotary table is equipped with a drive unit or index unit that controls the rotation of the rotating part of the driving fixture, and each unit can be continuously rotated or indexed depending on the processing at each station. By rotating the workpiece and transmitting this rotational force to the driving fixture through a desired transmission means, it is possible to perform workpiece rotation-type processing such as turning and thread cutting, which was previously considered impossible. According to this, it is highly expected that the versatility of rotary station machines will be further improved.

In this rotary station machine,
The rotating part of the drive unit, which controls the continuous rotation of the driving fixture during turning, can engage and disengage from the rotating body of the driving fixture, so when stopping the rotation at each station, It must be stopped at a constant angle stop position.

This invention was mainly made as a means to more effectively realize the above-mentioned rotary station machine, and the spindle of the drive unit that controls continuous rotation of the driving fixture is It is an object of the present invention to provide a constant-angle stop device for a spindle that can be positioned at a constant-angle stop position in one motion by a separate drive mechanism.

That is, the device of the present invention includes an engagement groove formed on the outer circumference of the spindle, and a positioning pin that is arranged so as to be movable forward and backward to engage and disengage from the engagement groove, and that controls the constant angle stop positioning of the spindle. , a rotational drive mechanism provided for rotating the spindle at a low speed by a drive system separate from the drive system thereof; and a mechanism for converting the rotational force of the rotational drive mechanism into forward and backward movement of the positioning pin. The spindle is rotated at a low speed by driving the rotational drive mechanism, and at the same time, the positioning pin is moved forward and backward, so that the spindle can be positioned at a constant angle in one motion.

Hereinafter, a case in which an embodiment of the present invention is applied to a drive unit of a driving fixture in the above-mentioned rotary station machine will be described in detail with reference to the drawings.

Figure 1 shows the structure of the driving fixture attached to the rotary table 1.
At each processing station below the rotary table 1, a drive unit 2 for continuously rotating the driving fixture for turning, etc. is disposed facing the rotary table 1.

3 is the base of the driving fixture;
The base body 2 has a rotary body 5 vertically rotatably disposed through a sleeve 4, and a work chuck mechanism (not shown) is mounted on the upper end flange portion 5a of the rotary body 5.

Further, a driven body 6 having approximately the same diameter as the sleeve 4 is integrally attached to the lower end of the rotating body 5, and wedge-shaped positioning pins 7 at both ends of the driven body 6 vertically pass through the driven body 6. It is inserted and supported so that it can move up and down with its center different from the axis of the body 5, and is biased downward by a coil spring 8.

This positioning pin 7 is connected to the rotating body 5 relative to the base 3.
In other words, the rotary body 5 is positioned in the rotational direction of the base body 3 in a relatively rotatable relationship with respect to the base body 3 and is stopped at a constant angle stop position. The sleeve 4 has a function of transmitting continuous rotation to the rotating body 5.
An engagement groove 9 in which the positioning pin 7 can engage is formed on the lower end surface of the drive unit 2, and at the same time, the positioning pin 7 can also engage with the engagement groove 10a on the drive plate 10 of the drive unit 2. .

That is, the positioning pin 7 has separate functions in the upper and lower positions of its reciprocating stroke, and as shown in the figure, when the positioning pin 7 is engaged with the engagement groove 9 on the sleeve 4 side, The base body 3 and the rotary body 5 are regularly and mechanically positioned, and in this state, the blade rotation type machining and the index rotation of the rotary table 1 are performed.

Conversely, if the positioning pin 7 moves downward and engages the engagement groove 10a on the drive plate 10, the positioning pin 7 is released and the rotating body 5 and the drive plate 10 are engaged and integrated, and the rotating body 5
is in a state where it can freely rotate relative to the base body 3. Therefore, in this state, drive unit 2 (described later)
is driven to rotate, and the rotating body 5 is continuously rotated as in turning.

Further, the base body 3 is provided with a switching mechanism mainly composed of a slide shaft 11 for selectively switching between the two states. That is, the slide shaft 11 is configured to be able to move up and down via a coil spring 12, and its lower end engages with the pin 7a protruding from the positioning pin 7 described above, while its upper end engages with the pin 7a that projects from the positioning pin 7. It is connected to the piston rod of an air cylinder that is a reciprocating drive source (not shown). and,
By moving the slide shaft 11 up and down, the rotating body 5 can be positioned and stopped using the positioning pin 7 as a medium, or it can be rotated continuously by receiving rotation transmission from the drive unit 2, which will be described later. It is now possible to switch.

2 and 3 show the structure of the device of the present invention, that is, a drive unit 2 that controls the continuous rotation of the above-mentioned driving fixture.
A spindle 15, which is provided with a fixed flange 14 of a clutch that also serves as a pulley for rotation transmission, is rotatably supported at the lower end via bearings 16, 16. The unit body 13 is continuously rotated via a belt 18 wound around the output shaft 17a of a motor 17 with a brake mounted on the unit body 13.

Reference numeral 19 denotes an intermediate shaft slidably provided on the same axis as the spindle 15;
is biased upwardly by a coil spring 20 contained in its lower half, and at the same time is a movable flange 2 that can engage with the fixed flange 14.
1 and an intermediate gear 22 that can freely rotate with respect to the intermediate shaft 19. and fixed flange 1
4 and the movable flange 21 have mutually engageable pawls on their opposite surfaces, thereby forming a dog clutch.

Further, the intermediate gear 22 meshes with a drive gear 24 on the output shaft of a drive motor 23 provided in parallel with the spindle 15, so that the intermediate gear 22 is rotationally driven with respect to the intermediate shaft 19. It's getting old.

25 is a rotatable auxiliary shaft provided in parallel with the spindle 15, and on this auxiliary shaft 25 there is an end cam 26 for vertically moving the movable flange 21 including the intermediate shaft 19, and an intermediate gear. A driven gear 27 that meshes with the drive gear 22 and a plate cam plate 28 for reciprocating a positioning pin 30, which will be described later, are each mounted on the same axis.

That is, the intermediate shaft 1
A cam follower 29 protruding from the intermediate shaft 19 is in pressure contact with the movable flange 21 on the intermediate shaft 19 according to the cam lead as the end cam 26 is rotated via the gear trains 27, 22 and 24.
moves up and down, and as a result, the above-mentioned meshing clutch is switched between the engaged and non-engaged states.

30 is a positioning pin with a wedge-shaped tip, which is provided above the auxiliary shaft 25 and is slidable in a direction orthogonal to the axis of the spindle 15, and which controls the positioning of the spindle 15 at a constant angle;
This positioning pin 30 is urged toward the axis of the spindle 15 by a coil spring 31, and a cam follower 32 provided at the longitudinally intermediate portion presses against the plate cam 28, and responds to the cam lead. It is designed to move forward and backward.

That is, an engagement groove 33 in which the positioning pin 30 can be engaged and disengaged is formed on the outer peripheral surface of the fixed flange 14 that the positioning pin 30 faces, and the positioning pin 30 is engaged with this engagement groove 33. In this state, the spindle 15 is stopped at a fixed angle and positioned.

In addition, 34 and 35 are proximity switches arranged so as to sandwich the movable plate 36 attached to the end of the positioning pin 30 and face each other on both sides of the movable plate 36. The state in which the positioning pin 30 is engaged with the positioning pin 33 and the state in which it is disengaged from the positioning pin 30 are individually detected.

Next, a series of operations of the drive unit according to the above configuration will be explained together with the movement of the driving fixture.

In FIGS. 2 and 3, it is assumed that the spindle 15 of the drive unit 2 has already been positioned at a constant angle stop position by engagement between the positioning pin 30 and the engagement groove 33. When the rotary table 1 is index-rotated and positioned in this state, the driving fixture will be located opposite to the spindle 15 of the drive unit 2, and as described above, the driving fixture will be located at the front station. Since the rotating body 5 itself is positioned at a constant angle, the constant angle stopping position of the spindle 15 and the constant angle stopping position of the rotating body 5 match, and the positioning pin 7 on the driving fixture side and the driving Board 10
The upper engagement grooves 10a will face each other.

When the slide shaft 11 is moved downward in this state,
At the same time as the positioning of the rotating body 5 of the driving fixture is released, the rotating body 5 and the drive plate 10 of the drive unit 2 are connected via the positioning pin 7, and the proximity switch 37 detects this state.

Then, based on this detection signal, the drive motor 2
3 is activated, the positioning pin 30 retreats and leaves, releasing the positioning state. Subsequently, the motor 17 of the drive unit 2 is driven based on the detection signal of the proximity switch 34, and the rotating body 5 is continuously rotated to perform work rotation type machining such as turning.

Thereafter, when the predetermined machining is completed, the brake of the motor 17 is activated to stop its rotational drive, and the brake activation state is immediately released and the motor 1
The output shaft 17a of No. 7 becomes freely rotatable.

Here, when the drive motor 23 is started in reverse at a low speed again, the end face cam 26 and the plate cam 28 on the auxiliary shaft 25 are rotated synchronously via the intermediate gear 22, and the positioning pin 30 is gradually advanced to move the fixed flange 1.
At the same time, the movable flange 21
is raised in response to the cam lead of the end cam 26, and its claw surface comes into pressure contact with that of the fixed flange 14. When the two mesh with each other, the fixed flange 1
When the entire spindle 15 including 4 rotates together, and the engagement groove 33 engages with the positioning pin 30 that is in pressure contact with the outer periphery of the fixed flange 14 during the rotation, the spindle 15 is positioned to stop at a fixed angle. , the proximity switch 35 detects this state, and the drive motor 23 is stopped.

Subsequently, the slide shaft 11 on the driving fixture side is driven upward, and as a result, the rotating body 5 is released from the engaged state with respect to the spindle 15.
As described above, the positioning is performed by its own mechanical positioning mechanism. With this, one cycle of the rotary station machine is completed, and the rotary table 1 is index-rotated again to repeat the above-described operation.

As is clear from the above description, according to the device of the present invention, the spindle is rotated by one motion of the rotation transmission mechanism that is separate from the rotational drive system of the spindle, and the positioning pin moves back and forth, thereby causing mechanical damage. Since positioning is performed, the reliability is extremely high, and for example, the NC control circuit for constant angle stop positioning can be simplified, especially when applied to the rotary station machine in the above embodiment.
The realization of NC control can greatly contribute to lowering the cost of the entire machine, which tends to be expensive.

Therefore, when the device of the present invention is applied as a drive unit of a rotary station machine, its functionality can be made even more effective for not only blade rotation type machining but also workpiece rotation type machining. be.

It goes without saying that the device of the present invention can be applied to any spindle device with only minor design changes that do not change the gist of the device.

[Brief explanation of the drawing]

The drawing shows the configuration of main parts of a rotary station machine as an embodiment of the present invention.
2 is a cross-sectional explanatory view of a driving fixture, FIG. 2 is a cross-sectional explanatory view of a drive unit to which the present invention is applied, and FIG. 3 is a cross-sectional view taken along the line 3--3 in FIG. 14... fixed flange, 15... spindle,
22... Intermediate gear, 21... Movable flange, 23
... Drive motor, 24 ... Drive gear, 26 ... End cam, 27 ... Driven gear, 28 ... Plate cam, 3
0...Positioning pin, 33...Engagement groove.

Claims (1)

[Claims] 1 Auxiliary shafts arranged vertically parallel to each other at intervals on the unit main body and pivotally supported by the unit main body, an intermediate shaft provided vertically movable with respect to the unit main body, and a coaxial shaft located above the auxiliary shaft. an end face cam, a driven gear, and a plate cam that are stacked on each other and are provided integrally with the auxiliary shaft; and an end cam, a driven gear, and a plate cam that are provided in the unit body so as to be slidable in a direction perpendicular to the axial direction of the auxiliary shaft. A positioning pin that integrally has a cam follower to be joined, a spring member provided between the unit main body and the positioning pin for biasing the positioning pin in one direction, and a spring member fixed to the intermediate shaft and pushing the intermediate shaft upwardly. a cam follower that comes into contact with the end cam by a spring member biasing the intermediate shaft; and an intermediate shaft that is mounted on the upper end of the intermediate shaft so as to be rotatable relative to the intermediate shaft and movable up and down integrally with the intermediate shaft, and that meshes with the driven gear. a gear; a movable flange integrally provided on the intermediate gear; a spindle provided on the unit body above the movable flange and driven by a spindle motor; a fixed flange provided on the fixed flange, an engagement groove formed on a side of the fixed flange, a mutually engageable claw portion formed on each opposing joint surface of the fixed flange and the movable flange; a drive motor having a drive gear provided on the unit body and meshing with the intermediate gear;
By the rotation of the intermediate gear by the drive motor, the movable flange is controlled to join or detach from the fixed flange, thereby rotating or releasing the fixed flange, and the positioning pin is moved forward and backward in the direction of the fixed flange. A constant angle stop device for a spindle, characterized in that it is configured to be able to position or release.