JP2000000731A - Rotation preventive mechanism of rotary tool adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a tip position of a rotation preventive pin, and to reliably maintain the position by arranging a ball type sensor for allowing and regulating a movement of the rotation preventive pin to an auxiliary cylinder. SOLUTION: When pushing a presser (a pressing piece) 34 against a spring 35, pressing-down of a ball 33 is released. Thus, a rotation preventive pin 27 can be freely protruded in and retracted from an auxiliary cylinder 26 (a guide cylinder 22). A tip position of the rotation preventive pin 27 is adjusted by the action. When the presser 34 is released after adjusting this position, the presser 34 returns by a spring 35 to lock the rotation preventive pin 27 by reliably pushing the ball 33 in engaging holes 32 formed at equal intervals in the lengthwise direction on the outside surface of the rotation preventive pin 27 by the inclined face 34a. A spring constant of the spring 35 is properly set so that the action such as a tip position adjustment of the rotation preventive pin 27 is smoothly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation stopping mechanism for a rotary tool adapter used by being set on a spindle of a machine tool.

[0002]

2. Description of the Related Art In a machine tool such as a machining center, a tool is automatically changed and various kinds of processing are performed.
The replacement is performed by replacing the rotary tool adapter on which the tool is mounted.

The rotary tool adapter is disclosed in Japanese Utility Model Laid-Open No.
Various types have been devised as disclosed in Japanese Patent Application Laid-Open No. 83304 or the like, and the basic configuration thereof will be described with reference to FIGS. 1 and 3 showing an embodiment of the present invention. The rotatable body 10 having the rotatable member 10 inserted therein is rotatably supported, and the hollow housing 20 is provided with a rotatable detent pin 27, and the detent pin 27 is engaged with the detent pin 27.
Is provided. The engaging claw 31 is always engaged with the engaging hole 16 of the rotating body 10 so that the hollow housing 20 and the rotating body 10
(See Examples).

In this rotary tool adapter, as shown in FIG. 3, the rotating body 10 is fitted into the spindle D of the machine tool, and the detent pin 27 is fitted (engaged) into the engaging hole 40 of the spindle head G. And attach it. At this time, the engaging claw 31 retreats with the retreat when the detent pin 27 engages with the engaging hole 40 and detaches from the engaging hole 16, and the rotating body 10 rotates with respect to the hollow housing 20. Be free. In this state, the processing shifts to processing by the tool P.

In mounting the rotary tool adapter,
The engagement holes 40 of the detent pins 27 on the machine tool side are variously varied before and after in the axial direction of the main spindle D depending on each machine tool manufacturer and each model (see FIGS. 3 and 4). For this reason,
When the advance / retreat position of the detent pin 27 (the tip position of the detent pin 27) is fixed, the detent pin 27 is
In the worst case, the rotation preventing pin 27, the engaging hole 40, etc. are damaged.

In order to eliminate such a malfunction, it is necessary to adjust the position of the tip of the rotation preventing pin 27, and the above publication discloses a rotation preventing mechanism shown in FIG. That is, a guide cylinder 22 that is long in the axial direction of the main shaft D is integrally provided in the hollow housing 20, and an auxiliary cylinder 26 is inserted into the guide cylinder 22 so as to be able to protrude and retract, and a spring 2 that urges the auxiliary cylinder 26 in a protruding direction.
8, a rotation preventing pin 27 having a screw shaft is inserted into the auxiliary cylinder 26 so as to be able to protrude and retract, and an adjusting nut 50 is screwed to the rotation preventing pin 27. Adjustment nut 5
By adjusting the screwing amount of the auxiliary cylinder 2
6. Adjust the position of the tip of the detent pin 27 with respect to 6.

[0007]

Since the adjustment by the adjusting nut 50 is performed by turning the nut 50, the operation is cumbersome, and an improvement is desired. There is a possibility that the adjustment position may change due to rotation. If the adjustment position changes, the above-described operation failure or the like may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to easily adjust the position of the tip of the rotation preventing pin and to surely maintain the position.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, the movement of the detent pin with respect to the auxiliary cylinder is permitted and regulated by a ball type stopper. Since the position of the ball type stopper is fixed by the insertion of the ball, the maintenance is stable, and the ball stopper is allowed to move by pushing up the ball, so that the adjustment is easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention, a rotating body, in which a tool is mounted and mounted on a main shaft of a machine tool, is mounted in a hollow housing which is detachably engaged with a fixed side of the machine tool. And a rotatable support is inserted into the hollow housing, and a guide cylinder that is long in the axial direction of the main shaft is integrally attached to the hollow housing. A spring that urges in the direction of rotation, the locking pin is provided with an engaging claw that engages with and disengages from the engaging hole of the rotating body in accordance with the retracting action of the pin, and the locking pin is provided on the fixed side of the machine tool. In the above-mentioned rotary tool adapter, in which the hollow housing is detachably engaged with the fixed side of the machine tool by being disengaged from the engagement hole, an auxiliary cylinder is protruded and retracted from the guide cylinder. A spring for biasing the auxiliary cylinder in a protruding direction is inserted into resident provided, provided with the spring biasing the locking pin in the projecting direction is inserted retractably said detent pin to the auxiliary cylinder,
A configuration may be adopted in which the engaging pawl is provided on the auxiliary cylinder, and a ball-type stopper is provided between the auxiliary cylinder and the detent pin to fix the detent pin at a required projecting position.

[0011] In this configuration, the ball-type stopper has engaging holes formed at equal intervals in the axial direction on the outer surface of the detent pin, and the auxiliary cylinder receives a ball that fits into the engaging hole. In addition to being able to move forward and backward in the direction,
A spring may be provided for urging the ball in the fitting direction via a pressing element, and the ball is disengaged from the engagement hole by retreating the pressing element from the ball against the spring. .

With this configuration, the ball cannot retreat from the engagement hole unless the pressing element is retreated from the ball, and therefore, the detent pin cannot move. To adjust the position of the tip of the detent pin, the presser is withdrawn from the ball, the ball can be released from the engagement hole, the detent pin is protruded and retracted with respect to the auxiliary cylinder, and the ball is inserted into the engagement hole at the required position. The pusher is fitted over the ball by being fitted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. 1 to 4. The rotary tool adapter according to this embodiment also has a hollow housing 20 or the like which is detachably engaged with a spindle head G of a machine tool as in the prior art. It comprises a fixed part A and a rotating part B such as the rotating body 10 inserted into the hollow housing 20 and mounted on the main shaft D.

A mounting hole 11 for a tool P is formed at the tip of the rotating body 10 forming the rotating portion B. The tool P is inserted into the hole 11 and the screw 12 is tightened to mount the tool P. An oil passage t communicates with the mounting hole 11, and when a coolant (cutting oil) is sent from the oil passage t into the mounting hole 11 as described later, the coolant is covered from the tip through the oil passage t of the tool P. It is sent to the cutting.

Further, the grooved flange portion 13 is formed in the middle of the rotating body 10.
A key groove 14 is formed in the flange portion 13, an exchange hand of an automatic tool changing device is engaged with the flange portion 13, and a key of the main shaft D is engaged with the key groove 14. Rotating body 1
The rear end of the rotary body 10 is formed in a tapered shank 15. The tapered shank 15 is inserted into the main shaft D, and a tension rod is screwed into a screw hole (not shown) at the rear end to be pulled. It is attached to the main shaft D and rotates together with the main shaft D.

On the other hand, the hollow housing 20 forming the fixing portion A
The rotatably supports the rotating body 10 via a ball bearing 21 such as an angular ball bearing made of a ceramic ball, and a guide cylinder 22 is provided on an outer surface. In the figure,
17 is a cover, 21a is a bearing retainer. An oil pipe 23 is provided from the guide cylinder 22 to the hollow housing 20, and the oil pipe 23 is connected to the oil distribution ring 2 in the hollow housing 20.
It communicates with 4. The oil distribution ring 24 is sealed by a packing 25 and the inner surface thereof is an annular groove.
Even if 0 rotates, the coolant from the oil pipe 23 is sent into the oil path t.

In the guide cylinder 22, an auxiliary cylinder 26 is provided.
Are inserted into the auxiliary cylinder 26 so as to be freely retractable, and a hollow detent pin 27 is inserted into the auxiliary cylinder 26 so as to be retractable. The auxiliary cylinder 26 and the detent pin 27 are respectively connected to the spring 2.
8, 29 urged in the protruding direction. A sliding cylinder 30 is slidably fitted on the outer periphery of the auxiliary cylinder 26,
An engaging claw 31 is provided on the sliding cylinder 30. When the engaging claw 31 is locked in the engaging hole 16 on the outer periphery of the rotating body 10, the fixed portion A and the rotating portion B are integrated (see FIG. 1), and the engaging claw 31 is By detaching, the rotating part B becomes rotatable with respect to the fixed part A (FIG. 3,
4).

The outer surface of the detent pin 27 has a V
Grooves (engagement holes) 32 are formed at equal intervals in the length direction.
A ball 33 supported in three equal parts around the auxiliary cylinder 26 is fitted in the groove 32. The interval between the V grooves 32 is appropriately set in consideration of the degree of adjustment of the tip position of the rotation preventing pin 27 described later, and the number of the balls 33 is also arbitrary. The ball 33
The presser (presser) 34 is composed of the auxiliary cylinder 26 and the sliding cylinder 3
The ball 33 is movably fitted during the period 0, and is pressed by the spring 35 so that the ball 33 is fitted into the V groove 32.

The pressing of the ball 33 by the presser 34 is as follows.
As shown in FIG. 2 (a), the ball 3
3 is pushed into the V-groove 32 and locked, so that even if the detent pin 27 attempts to move in the axial direction, it cannot move due to the lock. On the other hand, when the presser 34 is pressed as shown by the arrow in FIG. 3B, the press of the ball 33 is released. For this reason, the detent pin 27 can be freely protruded and retracted from the auxiliary cylinder 26 (the guide cylinder 22). By this action, the position of the tip of the detent pin 27 is adjusted. After the position is adjusted, when the presser 34 is released, FIG.
As shown by the arrow, the presser 34 is returned by the spring 35, and the ball 33 is securely pushed into the engagement hole 32 by the inclined surface 34a, thereby locking the detent pin 27. The spring constants of the springs 28, 29, and 35 are appropriately set so that the operation of adjusting the position of the tip of the detent pin 27 is smoothly performed.

This embodiment is configured as described above, and as shown in FIGS. 3 and 4, the amount of protrusion (tip position) of the detent pin 27 corresponding to the position of the engagement hole 40 of the spindle head G.
Then, when the taper shank 15 (rotary body 10) is fitted into the spindle D, the rotation preventing pin 27 is fitted into the engagement hole 40 of the spindle head G and pushed back. Along with the pushing back, the auxiliary cylinder 26 and the engaging claw 31 are also pushed back via the ball 33, and the engaging claw 31 is separated from the engaging hole 16 as shown in FIGS. That is, the rotating portion B is rotatably supported by the fixed portion A.

In this mounted state, the cutting operation by the tool P is performed by rotating the main shaft D. At this time, the spindle head G
The coolant is fed from the oil path t of FIG.
3. Smooth cutting is performed by ejecting coolant from the tip of the tool P through each oil path t of the rotating body 10.

In the above embodiment, the rotating body 10 is
Although the tool P does not rotate, a planetary speed increasing mechanism is formed in the rotating body 10, and a rotary tool adapter (actually open flat 5-937) of a type that engages with the mechanism by rotation transmission holding the tool P.
34, the present invention can of course be inserted.

[0023]

As described above, according to the present invention, the rotation stop pin is caused to protrude and retract by the ball type stopper, and the tip position of the rotation stop pin is easily and stably adjusted.

[Brief description of the drawings]

FIG. 1 is a fragmentary front view of an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the embodiment.

FIG. 3 is a diagram illustrating the operation of the embodiment.

FIG. 4 is a diagram illustrating the operation of the embodiment.

FIG. 5 is a cutaway front view of a main part of a conventional example.

[Explanation of symbols]

 Reference Signs List A Fixed part B Rotating part D Spindle G Spindle head (fixed side) P Tool t Oil passage 10 Rotating body 11 Tool mounting hole 15 Taper shank 16 Engaging hole for engaging claw 20 Hollow housing 22 Guide cylinder 26 Auxiliary cylinder 27 Non-rotating Pin 28, 29, 35 Spring 30 Sliding cylinder 31 Locking claw 32 V groove (engaging hole) 33 Locking ball 34 Ball retainer (pressing element) 40 Locking side locking hole for detent pin

Claims (2)

[Claims] 1. A rotary body 10 in which a tool P is mounted and which is mounted on a main shaft D of a machine tool is inserted into a hollow housing 20 which is removably engaged with and fixed to a fixed side G of the machine tool. A guide cylinder 22 that is long in the axial direction of the main shaft D is integrally attached to the hollow housing 20, and a detent pin 27 is inserted into the guide cylinder 22 so that the detent pin 27 can be protruded and retracted. A spring 29 that urges in the protruding direction is provided.
An engaging claw 31 is provided for engaging and disengaging the engaging hole 16 of the rotating body 10 according to the protruding and retracting action of the pin 27, and the detent pin 27 is disengaged from the engaging hole 40 on the fixed side G of the machine tool. By doing so, in the rotary tool adapter in which the hollow housing 20 is engaged with and disengaged from the fixed side G of the machine tool, an auxiliary cylinder 26 is inserted into the guide cylinder 22 so as to be able to protrude and retract, and the auxiliary cylinder 26 is connected to the guide cylinder 22. A spring 28 for urging in the protruding direction is provided. The detent pin 27 is inserted into the auxiliary cylinder 26 so as to protrude and retract, and the spring 29 for urging the detent pin 27 in the protruding direction is provided. A ball type stopper is provided between the auxiliary cylinder 26 and the detent pin 27 so as to fix the detent pin 27 at a required projecting position. A rotation preventing mechanism for a rotary tool adapter, comprising: 2. The ball-type stopper has engaging holes 32 formed at equal intervals in the axial direction on the outer surface of the detent pin 27, and a ball that fits into the engaging hole 32 is formed in the auxiliary cylinder 26. 33 is provided so as to be able to advance and retreat in the fitting direction, and a spring 35 for urging the ball 33 in the fitting direction via a presser 34 is provided, and the presser 34 is retreated from the ball 33 against the spring 35. The rotation preventing mechanism according to claim 1, wherein the ball (33) is released from the engagement hole (32).