JPS628966Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a collect-type floating chuck, and more particularly, to a collect-type floating chuck suitable for tightening the outer diameter of a workpiece with reference to a center hole provided in the workpiece.

FIG. 1 is a sectional view showing a conventional collector type floating chuck.

A roughly cylindrical chuck body 3 is attached to the main shaft 1 of the lathe.
is installed. An L-shaped head center 5 is fixed to the inner diameter of the chuck body 3 and approximately at the center thereof in the axial direction, and the center of the head center coincides with the axis of the chuck body 3.

Further, a taper sleeve 7 and a collet 9 as chuck members are arranged on the inner diameter portion of the chuck body 3. That is, the tip of the chuck body 3 is enlarged in diameter, and the ring-shaped tapered sleeve 7 is fitted into this enlarged diameter portion 11 with a gap 15 between the chuck body 3 and the enlarged diameter portion 11 . A tapered portion 13 whose diameter increases outwardly is formed inside the tapered sleeve 7 .

Further, a substantially cylindrical collet 9 that extends to the inner diameter of the tapered sleeve 7 is provided on the inner diameter of the chuck body 3 and is connected to the inner diameter of the chuck body 3 and the gap 17.
It is arranged with This collet 9 surrounds the head center 5 mentioned above. Mata collection 9
A taper portion 19 that matches the taper portion 13 of the tapered sleeve 7 is formed on the outer periphery of the distal end portion of the main shaft 1, and a draw rod 21 that is inserted through the inside of the main shaft 1 is fitted into the base end portion. The reference numeral 23 indicates a tail center, and the center center of the tail center 23 and the center center of the head center 5 coincide with each other.

Therefore, according to such a conventional example, since the taper sleeve 7 and the collet 9 have gaps 15 and 17, respectively, with respect to the chuck body 3, the workpiece 25 can be moved as shown in FIG. Center hole 2 formed at both ends of axis L of workpiece 25
Even when there is a distance δ deviation between the workpiece 25 and the workpiece 7, the collet 9 can evenly tighten the outer diameter of the workpiece 25 with reference to the head center 5 and the tail center 23.

However, due to the presence of these gaps 15 and 17, the taper sleeve 7 and the collet 9 are allowed to move freely in the radial direction of the chuck body 3 when the floating chuck is tightened and released. Center core and collect 9
and the axis of the tapered sleeve 7 do not match. Therefore, when carrying the workpiece 25 into this chuck,
A problem arises in that the workpiece 25 comes into contact with the collet 9 and damages the collet 9. especially,
This phenomenon is remarkable when this collect type floating chuck is used in an automatic loading device of an automatic lathe.

This invention was devised in view of the above-mentioned conventional problems, and the object is to provide a collet type floating chuck that can easily and safely tighten a workpiece.

In order to achieve the above object, the collect type floating chuck according to the invention includes a chuck body, a head center disposed inside the chuck body with a center core aligned with the axis of the chuck body, and an inside of the chuck body. and a chuck member that surrounds the head center and is disposed with a gap between it and the chuck body so as to be able to tighten a workpiece, wherein the chuck body and the chuck member are A support member made of an elastic material is interposed in the gap, and the axis of the chuck member is aligned with the center core of the head center. This elastic member is an O-ring and is provided in the gap between the chuck body and the collector and the gap between the chuck body and the tapered sleeve. This also suppresses the inclination of the center of the head center.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 3 is a cross-sectional view showing an embodiment of the collection type floating chuck according to this invention.
Portions similar to those in the conventional example are designated by the same reference numerals, and a description thereof will be omitted.

The chuck body 30 has almost the same shape as the conventional chuck body 3, but an annular group 31 is provided on the proximal end of the inner diameter of the chuck body 30.
However, the enlarged diameter portion 11 on the tip side of the chuck body 30
Groups 33 of the same shape are respectively engraved. These groups 31 and 33 include O-rings 35 and 3 as supporting members made of an elastic material such as rubber.
7 are fitted into each. The inner diameter of the O-ring 35 is approximately the same as the outer diameter of the proximal end of the collet 9, and the inner diameter of the O-ring 37 is approximately the same as the outer diameter of the tapered sleeve 7. Therefore, the axes of the collet 9 and the tapered sleeve 7 coincide with the center of the head center 5.

Next, the effect will be explained.

One end of a workpiece 25 as shown in FIG. 2 is inserted into the tip of the collet 9, and the workpiece 25 is held by the head center 5 and tail center 23. Next, the draw rod 21 is pulled to the left in FIG. 3 by the cylinder installed on the main shaft 1, and the collet 9 moves in the same direction.
The tapered portion 19 contacts the tapered portion 13 of the tapered sleeve 7. Furthermore, the collect 9 is the workpiece 25
When the tapered sleeve 7 moves to the left along the outer diameter of the collet 9 through the tapered portion 13
It receives a radial force from the O-rings 35 and 37, and moves in the radial direction while compressing the O-rings 35 and 37, and the tapered portions 13 and 19 coincide to tighten the workpiece 25 due to their wedge effect.

According to the above embodiment, since the O-rings 35 and 37 are interposed in the gaps 15 and 17, respectively, and the axis of the collet 9 is aligned with the center of the head center 5, when the workpiece 25 is carried in, the Thing 25
Since the workpiece does not come into contact with the collet 9, the workpiece can be carried in easily, and furthermore, the collet 9 can be prevented from being damaged.

Furthermore, since the O-rings 35 and 37 are made of an elastic material, when the collet 9 moves along the outer diameter of the workpiece and the tapered sleeve 7 moves in the radial direction accordingly, the O-rings 35 and 37 37 is compressed, and the workpiece 25 can be suitably tightened by the collet 9.

Furthermore, since the O-rings 35 and 37 are made of an elastic material, and a force is applied to the collet 9 in the radial direction toward the center when the workpiece is tightened, the looseness of the collet 9 can be reduced when the workpiece is tightened, and the workpiece can be tightened. The accuracy of the outer diameter of the object 25 can be improved.

As described above, according to the collect-type floating chuck of this invention, a workpiece can be clamped easily and safely. In particular, since O-rings made of elastic material are provided at two locations, the center core of the head center can be aligned with the axes of the collet and taper sleeve, which not only prevents the workpiece from coming into contact with the collet, but also
It is possible to prevent these axes from tilting with respect to the axis of the workpiece, thereby preventing the collet and the workpiece's engagement surfaces from coming into contact only partially, resulting in full contact, thereby further preventing damage to the workpiece. It can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional collect type floating chuck, Fig. 2 is a front view showing a workpiece, and Fig. 3 is a sectional view showing an embodiment of the collect type floating chuck according to this invention. It is. 3... Head center, 7... Taper sleeve,
9...Collection, 15...Gap, 17...Gap,
25...workpiece, 30...chuck body, 35
...O-ring, 37...O-ring.

Claims (1)

[Scope of utility model registration request] A chuck body, a head center having a center core disposed inside the chuck body so as to be aligned with the axis of the chuck body, and a head center disposed inside the chuck body surrounding the head center with a gap between the head center and the chuck body. A collet-type floating chuck having a collet and a taper sleeve that can tighten a workpiece, characterized in that an O-ring made of an elastic material is interposed in the gap between the chuck body and the collet and the taper sleeve. Collet type floating chuck.