JPS61265205A - Holding tool - Google Patents

Abstract

PURPOSE:To tighten an object to be held by small force, by turning a rotary cylinder to be moved to the side of a large contour part in a chucking cylinder and pressing the chucking cylinder, having slits, to be contracted in the inner direction. CONSTITUTION:A root part in an object to be held is inserted into an insertion hole 4 in a chucking cylinder 3, and if a rotary cylinder 17 is turned, the cylinder 17 moves to a large contour part of the cylinder 3. As a result, the cylinder 3 is pressed to be contracted in the inner direction, and a holding took, forcing an internal peripheral surface of the cylinder 3 to be brought into contact by pressure with the peripheral surface of the object to be held, holds the object. The holding tool, providing plural streaks of slits 6 in the direction of an axial line of the cylinder 3 and easily contracting it to be deformed, enables chucking operation to be performed by turning the rotary cylinder 17 to be operated by very small force.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) This invention applies to machine tools,
The present invention relates to a holder for holding a tool such as a drill or a workpiece to be processed.

(Prior art) An appropriate angle of inclination is formed between the clamping cylinder on which the object to be held, such as a tool or workpiece, is attached, and the rotary cylinder fitted therewith, although the axis 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 rotary 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, except for the above-mentioned conventional problems, requires only a small force to rotate the rotary tube, and moreover, it can firmly hold the object when it is tightened. It is an object of the present invention to provide such a holder.

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.

(Operation) 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 plurality of cuts formed therein facilitate the contraction of the fastening tube. In addition, when the object to be held is tightly held, the outer circumferential surfaces of the parts of the clamping tube that are separated from each other by the cut are pressed by the intermediate tube that is compressed by the rotary tube via rollers, and The inner peripheral surface is pressed against the object to be held.

These parts are thus prevented from bending in or out. Furthermore, since the front and rear ends of each part are connected to an annular connecting part that connects the entire circumference, the above-mentioned The clamping tube exhibits high rigidity similar to a continuous clamping tube, and therefore stably holds the object to be held.

(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. 3
A fastening cylinder is integrally connected to one end of the main body 1 and is configured to be elastically deformable in the radial direction, and an insertion hole 4 for inserting an object to be held is formed inside. Reference numeral 5 indicates a fastening surface on the inner circumferential surface of the fastening cylinder 3. Reference numeral 6 indicates a cut formed in the middle part of the fastening cylinder 3 in the axial direction, and the middle part of the fastening cylinder 3 has a plurality of parts in the circumferential direction. 10. It is formed so as to be divided into 10... Reference numeral 9 denotes a stress dispersion hole formed continuously at the front end and the rear end of the cut 6, and is formed in a round hole shape. 11.12 indicates an annular connecting portion formed on the front and rear sides of the cut 6, and the rear end of the cut 6 may be extended to the position shown by the imaginary line in FIG. 1, 7
indicates the outer circumferential surface of the fastening cylinder 3, which is formed in a tapered shape such that the connecting portion 2 side becomes thicker. Reference numeral 14 denotes an intermediate cylinder disposed around the fastening cylinder 3, which is formed thin so that it can be easily contracted and deformed. This is also formed into a tapered shape having the same extent as the tapered shape of the outer circumferential surface V.
is 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, a well-known spanner groove 19 is formed on the outer circumferential surface.
As is well known, a plurality of guide holes are formed in the guide cylinder disposed between the guide cylinders, forming a birdcage-like shape, and each guide hole has a roller 2.
4 are placed rotatably. those rollers 2
4, as is well known, has a torsion position having a certain angle with respect to the central axis of the guide cylinder 21 (corresponding to the central axis of the fastening cylinder 3). 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, the base of the cutting tool is inserted into the insertion hole 4, and the rotating barrel 17 is rotated clockwise in FIG. 2. Then, the large number of rollers 24 are guided by the guide cylinder and rotate in the twisted position relationship as described above, so by rotating the rotating cylinder 17, the large number of rollers 24
are respectively rolled between the outer circumferential surface of the intermediate cylinder 14 and the inner circumferential surface 18 of the rotary cylinder 17, while spirally moving along the outer circumferential 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. As the rotary cylinder 17 advances toward the large diameter portion 8 in this way, the fastening cylinder 3 is compressed by the rotating cylinder 17 via the roller 24 and the intermediate cylinder 14, and the fastening cylinder 3 is Reduce diameter. 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, since a plurality of cuts 6 are formed in the middle part of the fastening cylinder 3, the parts 10. 1
0... has a high degree of flexibility in bending in the direction in which the fastening tube 3 is compressed, and each of these portions 10 can be elastically deformed inward with a very small force. Therefore, the force required to rotate the rotating cylinder 17 is small. Furthermore, in the above case, even if oil is attached around the base of the object to be held, the oil can escape into the above-mentioned cut 6, and the inner circumferential surface 5 of the clamping cylinder 3 is The object to be held can be firmly tightened by directly mechanically contacting the object. Furthermore, when the object to be held is fastened, even though the cut 6 is formed in the fastening cylinder 3 as described above, the front end of the fastening cylinder 3 forms an annular connecting part 11 that is connected all around. Therefore, even if cutting debris scatters during machining using an object to be held (tool or workpiece), the connecting portion 11 prevents the cutting debris from flying into the cut 6. To prevent.

Next, when the intermediate cylinder 14 is worn out and you want to replace it, remove the circlip 27 fitted to the fastening cylinder 3 and remove the rotating cylinder 17, guide cylinder 21, roller 24, etc. as shown in FIG. Then remove the intermediate cylinder 14 to the right, and then attach the intermediate cylinder 14 to the fastening cylinder 3
Next, place a new intermediate cylinder 14 over the fastening cylinder 3 in the opposite direction to the above, and then reinstall the rotating cylinder 17 etc. on the outer periphery of the intermediate cylinder 14. , and the circlip 27 prevents it from coming off. This completes the replacement of the intermediate cylinder 14.

(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. By moving the clamping cylinder 3 to the larger diameter side of the clamping cylinder 3, the rotating cylinder 17 compresses the clamping cylinder 3 via the roller 24, and its inner peripheral surface 5 clamps the base of the object to be held. It has the advantage of being able to hold it.

Moreover, by rotating the rotary cylinder 17 as described above, the tightening cylinder 3
When compressing, since the tightening cylinder 3 is divided in the circumferential direction by a plurality of cuts 6, each of these divided parts 1
0.10... can be bent extremely easily, the tightening cylinder 3 can be easily contracted and deformed, and the rotating cylinder 17 can be bent with a small force.
This has the effect of allowing the tightening operation to be performed by the rotating operation.

Moreover, even if the clamping cylinder 3 is divided in the circumferential direction by the cut 6 as described above, when the object to be held is clamped and held,
Each part 10 of the fastening cylinder 3 is mutually separated by the cut 6
．． The outer peripheral surface of 10... is connected to the roller 24 by the rotating cylinder 17.
The inner circumferential surface is pressed against the object to be held by the intermediate cylinder 14, which is compressed through the intermediate cylinder 14, and the front end of each part 10 is prevented from bending inward or outward. Since the upper and rear end portions are all connected to an annular connecting portion 11 and 12 that are connected all around the circumference, the clamping cylinder 3 The feature is that it exhibits great rigidity, similar to that of a continuous fastening tube. This means that when machining an object to be held (in the case of a tool) or machining the object to be held (in the case of a workpiece), the object to be held can be held stably and the machining accuracy can be increased. It has the effect of improving

Furthermore, even though the holder of the present invention has the cut 6 that brings about the above-mentioned effects, the cut can be formed by extremely easy cutting from the outer circumferential side of the fastening tube 3. There is.

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 is repeatedly rolled and the intermediate tube 14 is rotated over a long period of time. Another feature is that when the intermediate cylinder becomes worn out, it can be made to be in the same condition as new again very easily by replacing only the intermediate cylinder.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a half-sectional view;
FIG. 2 is a sectional view taken along line nn. 3... Tightening tube, 4... Insertion hole, 6... Cut, 1
4... Intermediate tube, 17... Rotating tube, 24... Roller. Figure 1 Figure 2

Claims (1)

[Claims] It has a hollow cylindrical shape that can be elastically deformed in the radial direction, and has a fastening cylinder whose inside has an open end for inserting the object to be held, and whose outer peripheral surface is tapered. A rotary tube is arranged around the mounting tube, and between the outer circumferential surface of the tightening tube and the inner circumferential surface of the rotating tube, by rotating the rotating tube, it is possible to rotate the rotary tube in the axial direction of the tightening tube. A number of rollers each having a torsional position with respect to the axis of the clamping cylinder are interposed so that the rotating cylinder can be moved to the larger diameter side of the clamping cylinder by rotating the rotating cylinder. In the holder, the clamping cylinder is configured to contract the clamping cylinder and clamping the object to be held, and the clamping cylinder has a plurality of screws that divide the axially intermediate part of the clamping cylinder in the circumferential direction. The cuts are formed in such a way that annular connecting parts connected to each other in the circumferential direction of the clamping cylinder remain on the front and rear sides of the cuts, respectively, and furthermore, the clamping cylinder and the plurality of rollers are connected to each other. A holder characterized in that an intermediate cylinder is interposed therebetween, and the roller rolls on the outer peripheral surface of the intermediate cylinder.