JPH026963Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a holder for attaching a rotated member such as an arbor or a cutting tool to a main shaft, and particularly relates to a holder with improved holding stability of the rotated member.

[Conventional technology]

The present applicant has previously proposed a holder that is easy to operate and can support rotated members such as arbor and rotary cutting tools with high centering accuracy. Jitsukō 1978−
This is what is shown in No. 52040.

As shown in FIGS. 4 and 5, this holder includes a rotated member 1 in which a plurality of engaging pieces 3 are provided at equal intervals in the circumferential direction on the outer periphery of a large diameter end of a taper shank 2.
(arbor shown in the figure), and the inner peripheral surface of the service ring 15 has an axis-perpendicular cross section of a portion 4 (hereinafter referred to as the petal-shaped portion) where the engagement piece 3 of the member 1 was present. A flange 17 having a similar shape and having a hole 16 slightly larger than the warp is provided.

Pass the petal-shaped part 4 through the hole 16 of the flange where the contours match, and
Insert the taper shank 2 of the rotated member 1 into.
After that, when the service ring 15 and the member 1 are relatively rotated by a certain angle, the retaining piece 18 present on the hole surface of the flange 17 and the engaging piece 3 of the petal-shaped portion 4 overlap each other, and the rotated member comes out. be stopped.

Next, under this locking condition, the tightening ring 12 screwed onto the outer periphery of the main shaft 10 is rotated, and the ring is connected to the ring via a bearing joint 13 so as to be rotatable and move integrally in the axial direction. When the intermediate ring 14 is pulled backward, the service ring 1 whose one end side is loosely fitted onto the intermediate ring 14
The thrust of the intermediate ring is transmitted to the member 5 via the spring 19, and the retaining piece 18 of the service ring presses the engagement piece 3 of the member 1. For this reason, the taper shank 2 is pushed into the taper hole 11, but the pressing force at this time is, as described above, the intermediate ring 14.
Since the force is transmitted to the service ring 15 via the spring 19, it is made uniform around the entire circumference, and therefore the rotated member 1 is not twisted and the main shaft 1
It is supported coaxially with respect to 0.

[Problem that the invention attempts to solve]

Engaging piece 3 and retaining piece 1 in the above holder
8 is engaged and disengaged by rotating the service ring 15 since it is not easy to rotate the rotated member after insertion.

Furthermore, since a guide shaft 21 supported by the flange 20 of the intermediate ring is inserted into the service ring 15 for the purpose of receiving one end of the spring 19,
Between the main shaft 10 and the intermediate ring 14, there is provided a flexibility 22 (the figure shows a circumferential groove with a sphere 23 as a stopper) for rotating the intermediate ring by a certain amount together with the service ring 15, as shown in FIG. .

However, because of this flexibility, the service ring 15 rotates by inertia together with the intermediate ring, which causes the retaining piece 1 to unexpectedly move.
It has been found that there is a possibility that the engagement between the engagement piece 8 and the engagement piece 3 may come loose.

The purpose of this invention is to eliminate the inertial rotation of the service ring in the holder, thereby increasing the reliability of its holding.

[Means for solving problems]

In this invention, in order to eliminate the above problem, as shown in FIG.
0, an anti-slip ring 25 whose other end flange 25a is inserted between the intermediate ring 14 and the flange 17 of the service ring is additionally provided. One end of the ring 25 is engaged with the outer periphery of the main shaft 10 so as to be non-rotatable but movable in the axial direction.

Further, a latch 26 is incorporated into the service ring 15, and an engagement member 26b that is biased by a spring 26a of this latch and retracts is attached to the ring 26 at the engagement point and the engagement release point of the engagement piece and the retaining piece 18. the recesses 25b and 25b' provided therein.

If this is done, as long as the engagement force of the latch 26 exceeds the inertial rotational force of the service ring 15 and intermediate ring 14, the problem of disengagement due to inertial rotation of the rings 14 and 15 will not occur.

Further, if a force exceeding the engagement force of the latch is applied to the service ring, rotation of the service ring 15 through a predetermined angle is permitted, so that the ease of attachment and detachment of the member 1 by so-called bayonet fitting is maintained as before.

The anti-slip ring 25 is engaged with the main shaft 10 by inserting spheres 27 semi-embedded at regular intervals around the outer circumference of the main shaft into a vertical groove 25c corresponding to the inner peripheral surface of one end of the ring 25. However, any engagement means may be used as long as it does not allow rotation but allows axial movement.

Further, the latch 26 is installed in the flange 17 portion of the service ring in parallel with the holder axis, and the latch 26 is attached to the flange 2
It may also be engaged with the end face of 5a.

In addition, if a receiving groove 25d (see FIG. 3) for the engagement piece 3 is provided on the inner circumferential edge of the other end of the ring 25, which acts together with the service ring in the axial direction, the rotation slip of the member 1 is provided. A prevention effect is obtained at the same time, and the axial dimension of the holder is also reduced to a minimum.

Since the other structures are almost the same as those in FIG. 4, the same reference numerals are given and the explanation will be omitted.

〔effect〕

As mentioned above, this invention employs a bayonet fitting structure between the service ring and the service ring for so-called one-touch attachment/detachment of the rotated member, and a tightening ring for accurate centering of the rotated member. In this holder, the axial thrust applied to the intermediate ring is transmitted to the service ring via a spring, and a uniform pressing force is applied from the service ring to the rotated member at each part in the circumferential direction. By providing an anti-slip ring that acts together with the service ring in the axial direction, and by latching the service ring in place, the problem of inertia of the service ring with the intermediate ring is eliminated. Therefore, the holding stability of the rotated member can be improved by making use of the holder's easy attachment/detachment and accurate centering effects as shown in Utility Model Publication No. 58-5204.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of the holder of this invention, Fig. 2 is an enlarged sectional view of the slip prevention ring,
3 is an end view of the other end of the ring, FIG. 4 is a sectional view of the holder to be improved, and FIG. 5 is a sectional view taken along line X--X in FIG. 4. 1... Rotated member, 2... Taper shank, 3
...Engagement piece, 4...petal-shaped portion, 10...main shaft,
11...Tapered hole, 12...Tightening ring, 13...
...Bearing joint, 14...Intermediate ring,
15...Service ring, 16...hole, 17...
Flange, 18... Retaining piece, 19... Spring,
21... Guide shaft, 25... Slip prevention ring, 25a... Flange, 25b, 25b'... Recess, 25c... Vertical groove, 25d... Receiving groove, 2
6... Latch, 26a... Spring, 26b... Locking member, 27... Sphere.

Claims (1)

[Scope of utility model registration request] A main shaft having a tapered hole at the end, a tightening ring screwed onto the outer periphery of this shaft, an intermediate ring rotatably connected to this ring so as to be able to move together in the axial direction, and one end connected to the above-mentioned intermediate ring. A flange is attached to the inner surface of the other end, and a plurality of engaging pieces are formed at equal intervals in the circumferential direction on the petal-shaped portion of the rotated member, that is, the outer periphery of the large diameter end of the tapered shank. The service ring has a similar cross-sectional shape to that of the above-mentioned part and is slightly larger in size, and the inwardly projecting part is supported by a hole-drilled service ring that serves as a retaining piece for the above-mentioned engaging piece, and an outer peripheral flange of the above-mentioned intermediate ring. A guide shaft inserted into the hole of the service ring parallel to the main shaft,
The holder is provided with a spring that is fitted onto the shaft and presses the service ring toward the intermediate ring, and in which the retaining piece is moved to the engagement position with the engaging piece by rotation of the intermediate ring. A flange on the outer periphery of the other end is provided with an anti-slip ring inserted between the intermediate ring and the flange of the service ring, and the flange on the outer periphery of the other end is engaged with the outer periphery of the main shaft in a non-rotatable manner but allows axial movement. A latch is incorporated in the latch, and a locking member of the latch that can be retracted and retracted is engaged with a recess provided in the flange of the slip prevention ring at the engagement point and the disengagement point between the engagement piece and the retaining piece. A holder characterized by: