JPH0443722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a holder for holding a tool such as a drill or a workpiece to be machined in a machine tool.

(Prior art) An appropriate inclination angle with respect to the axes is formed between the clamping tube on which the object to be held, such as a tool or workpiece, is attached, and the rotating tube that fits into the clamping tube, although it does not intersect with these axes. By arranging a large number of rollers over a wide range and rotating a rotary cylinder, the rollers rotate around their own axis and revolve spirally, causing the tightening cylinder to contract and tighten the object to be held on its inner peripheral surface. The holder that is designed to hold the fastening tube has a problem in that a large force is required to contract the fastening tube, and therefore a large force is required to rotate the rotating tube. In order to solve this problem, attempts have been made to provide the inner circumferential surface of the fastening tube with a plurality of grooves parallel to the axis of the fastening tube. Since the object is divided in different directions, there is a problem in that the object to be held is less stable when it is held.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, requires only a small force to rotate the rotary cylinder, and furthermore, when the object to be held is tightened, it is firmly held. The purpose of the present invention is to provide a holder that makes it possible to

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) When the base of the object to be held is inserted into the insertion hole of the clamping cylinder and the rotating cylinder is rotated, the rotating cylinder moves toward the large diameter portion of the clamping cylinder. As a result, the clamping tube is compressed inward, and the inner circumferential surface of the clamping tube comes into pressure contact with the outer circumferential surface of the object to be held, thereby holding the object. When the fastening tube is compressed, the large number of holes for poor absorption provided on the outer circumferential surface facilitates the contraction of the fastening tube.
In addition, since the numerous holes mentioned above do not impair the continuity of the entire outer circumferential surface of the clamping cylinder, when the object to be held is clamped by the clamping cylinder, the clamping cylinder exhibits great rigidity and stably holds the object. can do.

(Example) Below, drawings showing examples of the present application will be described. Reference numeral 1 denotes the main body, and 2 a connecting part provided at the base of the machine, which is a part that is attached to the spindle of a machine tool. Reference numeral 3 denotes a fastening cylinder integrally connected to one end of the main body 1, which is configured to be elastically deformable in the radial direction, and has an insertion hole 4 formed therein for inserting an object to be held. . Reference numeral 5 indicates a fastening surface on the inner peripheral surface of the fastening cylinder 3. Reference numeral 7 indicates the outer circumferential surface of the fastening tube 3, which is formed in a tapered shape such that it becomes thicker on the connecting portion 2 side. On this outer peripheral surface 7, a large number of holes 6 for poor absorption are scattered in a staggered manner as shown in the figure. The dispersion state is such that the holes 6 are evenly arranged in the axial direction of the fastening cylinder 3,
They are also arranged evenly in the circumferential direction. The shape of the hole 6 is not limited to a circle, but may be triangular or square. Further, the dispersion state is not limited to the staggered shape as described above, but may be in the shape of a chess board. 14 is the tightening cylinder 3
It is an intermediate cylinder installed around the periphery, and is formed thin so that it can be easily contracted and deformed. Further, this is formed into a tapered shape having the same extent as the tapered shape of the outer circumferential surface 7. Next, reference numeral 17 denotes a rotating cylinder, the inner circumferential surface 18 of which is formed in a tapered shape parallel to the outer circumferential surface 7. In addition, there is a well-known spanner groove 1 on the outer circumferential surface.
9 is formed. Next, reference numeral 21 denotes a guide tube disposed between the fastening tube 3 and the rotating tube 17, and as is well known, a plurality of guide holes are formed in the guide tube 21 to form a bird cage shape, and a roller 24 is installed in each guide hole. They are placed so that they can rotate freely. Those rollers 24 are connected to the guide tube 2 as is well known.
1 (coinciding with the central axis of the fastening cylinder 3), the position is twisted at a constant angle. 25 is a rubber seal for dustproofing, 26 is a ring for holding the seal, and 27 is a circlip for preventing removal.

Next, a description will be given of an operation for holding an object to be held, such as a cutting tool (or a workpiece), using the holder configured as described above. First, insert the base of the cutting tool into the insertion hole 4. Next, the rotating cylinder 17 is rotated clockwise in FIG. Then, the large number of rollers 24 are guided by the guide tube and rotate in the twisted position relationship as described above, so by rotating the rotating tube 17, the large number of rollers 24 are rotated.
are rolled between the outer circumferential surface of the intermediate cylinder 14 and the inner circumferential surface 18 of the rotating cylinder 17, respectively, spirally along the outer peripheral surface of the intermediate cylinder 14 toward the large diameter portion 8 of the fastening cylinder 3. proceed. As a result, the rotating cylinder 17 also moves in the same direction. In this way, the rotating tube 17 is connected to the large diameter portion 8.
When the fastening tube 3 moves toward the rotating tube 17
As a result, the fastening cylinder 3 is compressed via the rollers 24 and the intermediate cylinder 14, and the diameter of the fastening cylinder 3 is reduced. As a result, the clamping surface 5 comes into close contact with the outer circumferential surface of the cutting tool and tightly tightens it.

When the fastening cylinder 3 is contracted by rotating the rotary cylinder 17 as described above, there are many holes 6 on the outer peripheral surface of the fastening cylinder 3.
, the fastening cylinder 3 has a high degree of flexibility in the direction in which it is compressed, and the fastening cylinder 3 can be contracted with a relatively small force. Therefore, the force required to rotate the rotating tube 17 is small.

Next, when the intermediate cylinder 14 is worn out and it is desired to replace it, the rotating cylinder 17, the guide cylinder 21, the rollers 24, etc. are inserted through the circlip 27 fitted to the fastening cylinder 3 as shown in FIG. Turn it to the right and remove it. After that, the intermediate cylinder 14 is removed from the outer periphery of the fastening cylinder 3 in the circumferential direction. Next, a new intermediate cylinder 14 is placed over the fastening cylinder 3 in the opposite direction to that described above, and the rotating cylinder 17 and the like are again attached to the outer periphery of the intermediate cylinder 14, and are prevented from coming off with a circlip 27. This completes the replacement of the intermediate cylinder 14.

Next, FIG. 4 shows a different embodiment of the present invention, in which the fastening cylinder 3e is provided with a through hole 30 that communicates the strain absorbing hole 6e with the inner peripheral surface of the fastening cylinder 3e. It shows. With such a through hole 30, when an object to be held is to be tightly held as described above, even if oil is attached around the base of the object, the oil will flow through the hole 6e. The inner circumferential surface 5e of the clamping cylinder 3e can directly mechanically contact the periphery of the object to be held, thereby firmly tightening the object.

It should be noted that the same reference numerals as those in the previous figure are appended with an alphanumeric letter "e" for parts that are functionally the same or equivalent to those in the previous figure, and redundant explanations are omitted.

(Effects of the Invention) As described above, in the present invention, when it is desired to hold an object, the base of the object is inserted into the insertion hole 4 of the fastening tube 3, and the rotating tube 17 is rotated. Tighten tube 3
By moving the rotating cylinder 17 to the larger diameter side,
As a result, the clamping cylinder 3 is compressed through the rollers 24, and the inner circumferential surface 5 of the clamping cylinder 3 can clamp the base of the object to hold it.

Moreover, when the fastening cylinder 3 is compressed by rotating the rotary cylinder 17 as described above, the distortion of the fastening cylinder 3 due to the compressing of the fastening cylinder 3 is dispersed on the outer circumferential surface of the fastening cylinder 3. Since the large number of strain absorption holes 6 absorb the strain, the fastening tube 3 has a high flexibility in bending in the direction in which it is compressed, and the force required for rotating the rotary tube 17 is relatively small, which is sufficient for operation. effective.

Furthermore, when tightening the clamping cylinder 3 to tighten the object as described above, the holes 6 are arranged evenly in the axial and circumferential directions of the clamping cylinder 3. The entire circumference of the fastening tube 3 contracts uniformly, and the core position of the object to be held can be held with high precision.

Furthermore, in that case, the force that compresses the clamping cylinder 3 by each roller 24 is distributed through the intermediate cylinder 14, and is distributed over a wider area than when the force is applied directly to the clamping cylinder 3 from each roller 24. Since it is applied to the fastening cylinder 3 in this state, the contraction of the fastening cylinder 3 can be made more uniform, and the accuracy of the center position can be further improved.

Furthermore, in the state in which the object to be held is tightened and held as described above, even if the object is provided with a large number of holes 6 so that the tightening operation can be performed with a relatively small force as described above, the tightening cylinder 3 Since the outer circumferential surface of the clamping cylinder 3 is substantially continuous over its entire circumference and length, when the object to be held is clamped, the clamping cylinder 3 On the other hand, the fastening tube 3 has a feature of exhibiting great rigidity against the force that tends to bend the object to be held. This is true when performing machining using the object to be held (in the case of tools),
When machining an object to be held (in the case of a workpiece), the object can be held stably and processing accuracy can be improved.

Furthermore, since the holder of the present invention is provided with the intermediate tube 14 as described above, and the roller 24 rolls on the outer circumferential surface of the intermediate tube 14, the roller 24 can be used for a long period of time.
If the intermediate cylinder 14 is worn out due to repeated rolling of No. 4, the intermediate cylinder 14 can be replaced very easily to be in the same state as new again by replacing only that intermediate cylinder.

[Brief explanation of drawings]

The drawings show an embodiment of the present application; FIG. 1 is a half-sectional view, FIG. 2 is a cross-sectional view taken along the - line, FIG. 3 is a developed view of the outer peripheral surface of the fastening cylinder, and FIG. 4 shows a different embodiment. Partial view. 3... Tightening tube, 4... Insertion hole, 6... Hole for strain absorption,
14...Intermediate cylinder, 17...Rotating cylinder, 24...Roller.

Claims (1)

[Claims] 1 It has a hollow cylindrical shape that can be elastically deformed in the radial direction, and has an insertion hole for the held object with one end open inside, and a fastening cylinder whose outer circumferential surface is tapered, and the above A rotating tube is disposed around the tightening tube, and a rotating tube is provided between the outer circumferential surface of the tightening tube and the inner circumferential surface of the rotating tube. A large number of rollers are interposed in a twisted position relative to the axis of the clamping cylinder so that the cylinder can be moved in the axial direction of the clamping cylinder, and the rotary cylinder is rotated to move it in the direction of the large diameter of the clamping cylinder. In a holder that is designed to tighten the object to be held by contracting the clamping cylinder by moving it to the side, the outer peripheral surface of the clamping cylinder has a large number of holes for absorbing strain in the clamping cylinder. are evenly distributed in the axial direction and circumferential direction of the clamping cylinder, and an intermediate cylinder is interposed between the clamping cylinder and the plurality of rollers, so that the rollers roll on the outer peripheral surface of the intermediate cylinder. A holder characterized by being movable.