JP3115514B2 - Chuck holder mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

In the present invention, when a tool such as a drill or a tap is mounted on a spindle, the tool is mounted on the spindle via a holder provided with a chuck such as a collet for holding the tool. The present invention relates to a mounting device that can be easily attached to and detached from a spindle and that can reliably transmit rotation.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 61-427 discloses this type of apparatus.
The one disclosed in Japanese Patent Publication No. 54 is known. The device disclosed in this publication is characterized in that the shaft portion of the chuck holder inserted into the cylindrical portion of the spindle is prevented from coming off by locking means for projecting several spheres provided on the cylindrical portion into the concave grooves provided on the shaft portion. As a means to escape the shaft portion of the chuck holder to the outside of the cylindrical portion, an extruding member that presses the shaft portion of the chuck holder to the outside of the cylindrical portion with a spring force is provided in the cylindrical portion, and the outer periphery of the cylindrical portion is provided. By sliding the provided sleeve against the spring attached thereto, the sphere is brought into a state in which it can float from the cylindrical portion, and the repelling force of the pushing member causes the sphere to float and simultaneously the shaft of the chuck holder. It is configured to extrude. Moreover, in order to prevent the sphere provided in the cylindrical portion from falling into the cylindrical portion, the push member is provided with a cutout portion for receiving the sphere when the member advances.

[0003]

According to the apparatus disclosed in the above publication, the chuck holder is mounted so as not to fall off by merely inserting the shaft part into the cylindrical part, and the sleeve is slid so as to be pressed by the pushing force of the pushing member. The chuck holder can be automatically withdrawn and detached by a so-called one-touch operation. However, if this device is provided on a head with an upright spindle, the operation of inserting the chuck holder from below There is no problem when inserting the sleeve.However, when the sleeve is operated and removed, it is pushed out by the push-out member. To the work surface, etc., as well as tools such as drills. Ri, the worker was always there is a problem that must be carefully deal with the removal of the chuck holder.

An object of the present invention is to solve the above-mentioned problem. The chuck holder has a simple structure and is set in a state where the chuck holder can be extracted when the chuck holder is extracted. However, the chuck holder is not automatically dropped unless a pulling force is applied to the chuck holder. It is another object of the present invention to provide a chuck holder mounting device configured as described above.

[0005]

According to the first aspect of the present invention,
A chuck holder mounting device in which a shaft portion of a chuck holder is removably fitted by a rotation transmitting means, a locking means, and a releasing means in a cylindrical portion provided at a tip portion of a spindle, wherein the rotation transmitting means comprises a chuck. Insert the protrusion into the drive key provided on the outer periphery of the holder toward the shaft, and insert the shaft.
A concave portion with which the protruding piece is engaged
The locking means is provided with a cam surface having an inclined surface on an operating sleeve which is fitted by being biased toward the base side of the spindle by a spring on the outer periphery of the cylindrical portion. A plurality of spheres provided so as to be able to come and go inside and outside of the part are pushed into the cylinder part, and are configured to be able to engage with the concave grooves provided in the shaft part, and each of the holes provided for accommodating the spheres provided in the cylinder part, By making the opening on the outer periphery larger than the opening on the inner periphery, it is possible to make the sphere escape to the outer periphery of the cylindrical portion and to make it impossible to fall off to the inner periphery. , The protruding piece is formed to a thickness protruding from the outer peripheral surface of the cylindrical portion,
A step is provided on the surface of the tip of the projection, and the operating sleeve is pulled toward the tip of the cylinder against the spring, so that the sphere separates from the cam surface and the operating
The leading edge of the operating sleeve engages the step and presses the chuck holder, and the pressing force acts as a force to pull out the shaft from the cylinder, and a space provided between the inner circumference of the operating sleeve and the outer circumference of the cylinder. Wherein the spherical body floats from the cylindrical portion and escapes, and the engagement between the spherical groove and the concave groove of the shaft portion is released.

[0006]

As described above, when releasing the locked state of the shaft portion of the chuck holder, the operating sleeve is slid. Simply remove the restraining sphere from the cam surface of the operating sleeve,
The sphere remains engaged in the groove so that the chuck holder does not fall off. However, by further sliding the operating sleeve, the chuck holder can be pulled out by pressing the chuck holder with the tip edge of the operating sleeve, and the chuck holder can be pulled out only by manual operation, so that
The chuck holder can be safely removed without accidentally dropping.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention can be applied to a multi-axis head, a drilling unit or a tapping unit.

As shown in FIG. 1, a spindle portion 5 is provided at the tip of a spindle 2 protruding from the head 1 and has a hollow portion 3 inside which a shaft portion 5 protrudes from a chuck holder 4 made of a collet. , The chuck holder 4 is rotated together with the spindle 2 by the rotation transmitting means 6, the chuck holder 4 is integrally attached to the spindle 2 by the locking means 7, and the chuck holder 4 is further fixed by the releasing means 8. It is configured such that it can be extracted from the tube portion 3 with a simpler operation.

As shown in FIGS. 1 and 7, the rotation transmitting means 6 includes a drive key 10 having a pair of protruding pieces 9 (only one is shown in the figure) provided on a ring.
On the other hand, the protrusions 9 are integrally fitted by press-fitting means so as to protrude toward the shaft portion 5 side, while a concave portion 11 with which each protrusion 9 engages is provided at the tip of the cylindrical portion 3. Depends on configuration. Moreover, when each of the projections 9 is engaged with the recess 11, the projection 9
Are formed thick enough to protrude from the outer peripheral surface of the cylindrical portion 3. Preferably, a step 12 is provided on the surface of the tip of the projecting piece 9.

Therefore, when inserting the shaft portion 5 into the cylindrical portion 3,
By inserting the protruding piece 9 so as to fit into the recess 11,
The rotation of the spindle 2 can be transmitted to the chuck holder 4. In addition, as described above, if the separate drive key 10 is provided by means of press-fitting and fitting into the chuck holder 4, it is advantageous in terms of cost, and the projecting piece 9 of the drive key 10 is formed with necessary strength. There are advantages that can be.

Next, a description will be given of the main part of the cylinder part 3 of the spindle, the shaft part 5 of the chuck holder, and the operating sleeve 13 (hereinafter referred to as a sleeve) fitted on the outer periphery of the cylinder part 3 which constitute the locking means 7.

As shown in FIGS. 1, 5 and 6,
The cylindrical portion 3 of the spindle 2 is formed to have a diameter smaller than the diameter of the base protruding from the head 1 of the spindle 2, and a plurality of holes 14 are formed in the cylindrical portion 3 in the circumferential direction near the base side. They are arranged. A sphere 15 is provided in the hole 14.
The opening 16 on the outer peripheral side of the hole 14 is formed larger than the opening 17 on the inner peripheral side so that the sphere 15 does not fall into the cylindrical portion 3 at this time. Furthermore,
A stop ring 18 is attached to the outer periphery of the distal end portion of the cylindrical portion 3, and the above-mentioned concave portion 11 is provided at the distal end in a state cut from the distal end edge.

The shaft portion 5 of the chuck holder is formed to have a thickness that fits into the cylindrical portion 3, and has an annular concave groove 19 at its distal end. The upright surface on the side is formed on a tapered surface 20 whose diameter increases toward the tip. Further, a head 21 having a tapered portion which is tapered at the tip end portion from the concave groove 19 is provided.

The sleeve 13 is a cylindrical member having a thickness fitted on the outer peripheral surface of the base of the spindle 2.
Stop ring 18 provided from the base to the tip of cylindrical portion 3
And is fitted to cover the stop ring 18 so as to prevent chips from entering between the cylindrical portion 3 and the sleeve 13. Further, a cam surface 22 is provided on a portion of the inner peripheral surface of the sleeve 13 which faces the hole 14.
Are protruded in an inner collar shape. The cam surface 22 is the spindle 2
In the state where the spindle 2 is fitted, the spindle 2 is formed in a tapered shape that is inclined so as to become thicker from the base end side toward the tip end side, and the tip end is finished as an upright surface. The portion of the sleeve 13 facing the stop ring 18 has a tapered inner surface.

The members formed as described above are assembled as shown in FIG. 1. The sphere 15 fitted in each of the holes 14 has a part protruding into the cylindrical portion 3, and The sleeve 13 fitted on the outer periphery of the spindle 2
A compression type spring 23 interposed between an upright surface formed on the distal end side of the cam surface 22 and the stop ring 18 urges and attaches toward the head 1 side. Thereby, the sphere 15 is pressed toward the inside of the cylindrical portion 3. Also, the sleeve 13
Slides toward the stop ring 18 against the spring 23, so that the thinly formed distal end of the sleeve 13 fits into the step 12 of the drive key 10, and the chuck holder 4 is inserted through the drive key 10. Is pressed in a direction to exit the sphere 1.
5 is formed so as to be able to float in a space 23 provided between the outer peripheral surface of the cylindrical portion 3 and the inner peripheral surface of the sleeve 13. The head 21 provided on the shaft portion 5 of the chuck holder 4 is tapered as described above, and the tapered tip portion is, as shown in FIG. The cam surface 22 of the sleeve 13 is formed so as to protrude into an inscribed circle drawn by each sphere 15 pressed toward the inside of the cylindrical portion 3.

With the above structure, the chuck holder 4
Can be attached to the spindle 2 by inserting the shaft portion 5 of the chuck holder into the cylindrical portion 3. At this time, the sphere 15 is pushed up by the head 21 according to the insertion of the shaft portion 5, so that the sleeve 13 is The sphere 15 is temporarily pressed to the stop ring 18 side through the cam surface 22 and floats in the space 24 generated there. Therefore, the passage of the head 21 is allowed, and at the same time, the concave groove 19 faces the sphere 15. From
The spherical body 15 re-enters the cylindrical portion 3 through the cam surface 22 by the repulsive force of the spring 23, and engages with the concave groove 19 as shown in FIG. At the same time, the projecting piece 9 provided on the chuck holder 4 is engaged with the concave portion 11 of the cylindrical portion 3.

When removing the chuck holder 4 mounted as described above, the sleeve 13 is pressed against the stop ring 18 against the spring 23 and slides, so that the leading edge of the sleeve 13 is driven by the drive key. 1
The projection 9 is engaged with the step 12 of the protruding piece 9 and pushed out in the direction in which the chuck holder 4 is pulled out, but the cam surface 22 is slightly displaced from the sphere 15 as shown in FIG. Then, the pressing force against the sphere 15 is released, but the sphere 15 is held in the state of being engaged with the concave groove 19 as it is without any other levitation force.

Then, when the sleeve 13 is further slid, the chuck holder 4 is pressed while the tip end of the sleeve 13 is engaged with the step portion 12 of the drive key 10, and as shown in FIG. The portion 5 starts to be pulled out, and an external force for pushing the sphere 15 out of the cylindrical portion 3 at the head portion 21 of the shaft portion 5 acts. At the same time, the cam surface 22 of the sleeve 13 moves to the distal end side, and a space portion 24 is generated there. Since the sphere 15 is pushed into the space 24, the chuck holder 4 can be removed from the spindle 2. Thereafter, the sleeve 13
By releasing the attraction force, the spring 23 returns by the repulsive force of the spring 23, during which the sphere 15 re-enters the hole 14 through the cam surface 22.

[0019]

According to the chuck holder mounting apparatus of the present invention, the chuck holder is removed by sliding the sleeve. However, the step of the projecting piece of the chuck holder is pushed by the leading edge of the sliding sleeve. Since it comes off by hitting, the operator's hand has the responsiveness of pushing and hitting the chuck holder, and the timing when it comes off can be reliably sensed, so there is no danger of accidentally dropping the chuck holder, improving safety At the same time, it is possible to provide a simple structure with fewer components.

Further, since the hole for accommodating the sphere is formed so as not to fall into the cylindrical portion, the chuck holder can be retained in the hole even when the chuck holder is pulled out. And the releasing action can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a chuck holder mounting device according to the present invention is being mounted.

FIG. 2 is a cross-sectional view showing a state of attachment.

FIG. 3 is a cross-sectional view showing an initial state when a chuck holder is removed.

FIG. 4 is a sectional view showing a state when a chuck holder is removed.

FIG. 5 is a sectional view of a spindle.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a perspective view showing a rotation transmitting unit.

[Explanation of symbols]

 2 Spindle 3 Cylindrical part 4 Chuck holder 5 Shaft part 6 Rotation transmitting means 7 Locking means 8 Release means 10 Drive key 13 Operating sleeve 14 Drill hole 15 Spherical body 19 Concave groove 22 Cam surface 23 Spring 24 Space

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 59-46604 (JP, U) Japanese Utility Model Sho 59-24231 (JP, U) Japanese Utility Model Sho 61-50632 (JP, U) Japanese Utility Model Sho 60- 127837 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 3/12

Claims (1)

(57) [Claims] 1. A cylindrical portion provided at a tip of a spindle (2).
Rotate the shaft (5) of the chuck holder (4) in (3)
Transmission means (6), locking means (7) and release means (8)
A chuck holder mounting device that is removably fitted.
The rotation transmitting means (6) is provided outside the chuck holder (4).
AroundEstablishedDrive key (10)To the shaft (9)
(5) Protruding toward the side, with the insertion of the shaft (5)
The concave portion (11) with which the protruding piece (9) engages is inserted into the tip of the cylindrical portion (3).
Formed in the part,  The locking means (7) is provided with a spring on the outer periphery of the cylindrical portion (3).
(23) urges toward the base side of the spindle (2)
The operating sleeve (13)
Providing a cam surface (22) having a slope, said cam surface (22);
And a plurality of spheres provided in and out of the cylindrical portion (3).
(15) is pushed into the cylindrical part (3) and set on the shaft part (5).
The cylinder is configured to be engageable with the grooved groove (19),
Each hole (1) for accommodating the sphere (15) provided in the section (3)
4) replaces the outer opening (16) with the inner opening.
Making the sphere (15) larger than (17)
The cylinder part (3) can escape to the outer circumference side and can escape to the inner circumference side.
The release means (8) is formed so that dropping is impossible.The protruding piece (9) is attached to the outer periphery of the cylindrical portion (3).
The surface of the tip of the protruding piece (9) is formed so as to protrude from the surface.
Is provided with a step (12),Operating sleeve (1
3) against the spring (23), the tip side of the cylindrical portion (3)
By attracting toSphere from cam surface (22)
(15) leaves and the operating sleeve
The leading edge of (13) engages with the step (12)Chuckho
And presses the cylinder (3) from the cylinder (3) to the shaft.
(3) Operating Three
The space provided between the inner circumference of the tube (13) and the outer circumference of the cylinder (3)
(24) The sphere (15) rises from the cylindrical portion (3) and escapes
Engagement between the groove (19) of the shaft (5) and the sphere (15)
The chat is characterized in that the
Holder mounting device.