JPS63169205A - Holding equipment - Google Patents

Abstract

PURPOSE:To prevent a held article from being tightened excessively by moving a swinging cylinder, as it is rotated, to the large bore side of a clamping cylinder until one locating piece touches the projection portion of the other locating ring, and then judging the completion of a clamping according to the then touching sound and the vibration propagated to the hand. CONSTITUTION:A held article is inserted into an inserting hole 4 on a clamping cylinder 3, and a swinging cylinder 17 is rotated, and then, the clamping cylinder 3 is compressed by means of a roller 27 so that the held article is clamped and held. In that case, the swinging cylinder 17 is moved to the large bore side of the clamping cylinder 3 until it reaches a fixed position where a clamping is completed, and a locating piece 38 as one locating tool is caused to touch the projection portion 32 of a locating ring 31 as the other locating tool. In addition, if the clamping of a held article at the abovementioned touching point of time becomes loose due to a long-time use, the locating piece 38 is caused to climb over the projection portion 32 of the locating ring 31 elastically. Thereby, an excessive clamping of a held article can be prevented, and the held article can be clamped and held certainly, and further, the life-time of a holding equipment can be extended.

Description

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

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

(Prior art) In conventional holders, a rotary tube is fitted around the outer circumference of a tightening tube of the main body through a number of rollers so as to be relatively rotatable, and the rotary tube is moved in the tightening direction. By rotating, the rotating tube is moved to the larger diameter side of the clamping tube to tighten the object to be held, so the degree of tightening must be determined based on the rotational resistance of the rotating tube. There are problems in that the tightening force varies depending on the person, and the rotary tube is turned too strongly, resulting in increased wear on the rotary tube and the fastening tube, resulting in a shortened lifespan. It is also known that the rotary cylinder and the main body are each provided with a positioning part, and one positioning part is brought into contact with the other positioning part to prevent over-tightening. However, there was a problem in that when the rotating tube was sufficiently rotated in the tightening direction, if the tightening became loose due to wear of the rotating tube or the tightening tube, it could no longer be used. Problems to be Solved) This invention eliminates the above-mentioned conventional problems and allows the user to check the degree of tightening of the object to be held due to the rotation of the rotary cylinder, and to perform retightening while determining the degree of tightening of the object to be held. The purpose of this invention is to provide a holder that can be obtained.

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 rotating tube is rotated in the tightening direction with the object to be held inserted into the insertion hole of the tightening tube of the main body, the rotating tube is moved to the larger diameter side of the tightening tube. As a result, the rotary cylinder compresses the fastening cylinder via the roller, and tightens the fastening cylinder to the object to be held. In the above case, when the rotating cylinder is rotated to the tightening completion position and moved to the larger diameter side, the positioning piece, which is one positioning tool, comes into contact with the convex part of the positioning ring, which is the other positioning tool. With the tuning fork, you can tell when the tightening is complete by the vibration transmitted to the hand operating the rotating barrel.

In addition, by making the positioning piece ride over the protrusion of the positioning ring, the rotary cylinder can be rotated in the tightening direction, and by counting the number of protrusions that can be overcome, the degree of tightening can be checked and further tightened. .

(Embodiments) The drawings showing the embodiments of the present application will be explained below. In FIGS. 1 to 3, 1 is a main body, and 2 is a connecting part provided at the base of the main body, which is a part that is attached to a 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 inside for inserting an object to be held. Reference numeral 5 indicates a fastening surface on the inner circumferential surface of the fastening tube 3, and 7 indicates an outer circumferential surface of the fastening tube 3, which is formed in a tapered shape such that the connecting portion 2 side becomes thicker. 10. . . . are grooves formed in the inner circumferential surface 5, each of which has an arcuate cross-sectional shape, is parallel to the axis of the fastening cylinder 3, and is elongated in the axial direction. Further, the depth thereof is set to be shallow so that a large wall thickness remains between the groove bottom 10a and the outer circumferential surface 7 of the fastening cylinder 3. Reference numeral 11 denotes a positioning portion provided annularly on the outer periphery of the base portion of the fastening tube 3. In the positioning part 11, 12 is a fitting surface formed concentrically with the fastening tube 3, and 13 is a fitting surface 1.
Ring grooves 2 and 14 are ball receiving holes, which are also formed in the fitting surface 12, and are provided at two locations as shown in FIG. Reference numeral 15 denotes a positioning surface perpendicular to the axis of the fastening tube 3. The improving groove 10 may have a rectangular cross-sectional shape, and its longitudinal direction may be inclined (spiral) with respect to the axis of the fastening cylinder 3.

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. An O-ring groove 20 is formed on the outer peripheral surface, and an O-ring 21 is fitted into the O-ring groove 2o. Also, a well-known spanner groove 19 is formed on the outer peripheral surface. Reference numeral 22 denotes a positioning portion provided on the insertion side end surface of the rotary tube 17. In the positioning section 22, reference numeral 23 denotes a positioning surface perpendicular to the axis of the rotary tube 17, which is formed by the end surface of the rotary tube 17. 24
is a roller housing hole formed on the outer peripheral surface of the rotating cylinder 17;
As shown in FIG. 2, they are provided at two locations. A portion of the roller housing hole 24 is open to the positioning surface 23. Next, reference numeral 26 denotes a guide tube disposed between the fastening tube 3 and the rotating tube 17. As is well known, the guide tube 26 has a plurality of guide holes formed therein to form a bird cage shape, and each guide hole has a roller 27. are placed so that they can rotate freely. Those rollers 27 are connected to the guide cylinder 2 as is well known.
6 (a part of the center axis of the fastening tube 3), the screw is placed in a twisted position having a certain angle.

28 is a rubber seal for dustproofing, and 29 is a circlip for preventing removal.

Next, reference numeral 30 denotes a positioning tool installed in the positioning section 11, which is constructed as shown in FIG.

In the positioning tool 30, 31 is a positioning ring, and a central hole 31a is rotatably fitted into the fitting surface 12. In the positioning ring 31, numeral 32 denotes a large number of convex portions formed on the side surface of the rotary cylinder 17, which are formed at equal pitch intervals in the circumferential direction. As shown in FIG. 5, this convex portion 32 is formed to have a trapezoidal cross section, and the rising surface 32a on the tightening rotation direction side is approximately perpendicular to the top surface 32C, and the rising surface 32b on the loosening rotation direction side is the bottom surface 32d. From top surface 32
They are formed on slopes that rise slowly towards c.

Reference numeral 33 denotes arcuate notches formed on the inner circumferential surface of the central hole 31a at positions facing the ball accommodation holes 14, respectively.

34 is the ball accommodation hole 14 and the notch 3 as shown in FIG.
3, the positioning ring 31 is prevented from relative rotation by more than a predetermined angle (approximately 60 degrees in the drawing). 35 is a circlip that fits into the ring groove 13 to prevent it from coming off, and 36 is a disc spring that is compressed and interposed between the positioning ring 31 and the positioning surface 15.
6 may be replaced with a wave washer, coil spring, rubber, or the like. Further, the disc spring 36 is connected to the positioning ring 31.
Alternatively, if the convex portion 32 is made of an elastic member, it may be omitted.

Next, reference numeral 37 denotes a positioning tool installed in the positioning section 22, which is constituted by a pair of rollers 38, which are illustrated as positioning pieces. As shown in FIG. 1, the roller 38 is rotatably fitted into the roller housing hole 24, and a portion of its outer periphery protrudes from the positioning surface 23. The roller 38 is prevented from coming off by a cover which will be described later. Note that a cover 39 is fixed to the main body 1, and its inner surface is in sliding contact with the O-ring 21.

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 then rotated in the direction of the arrow in FIG. Then, the large number of rollers 27 are guided by the guide cylinder 26 and rotate in the twisted position relationship as described above, so by rotating the rotating cylinder 17, the large number of rollers 27
are rolled between the outer circumferential surface 7 of the fastening tube 3 and the inner circumferential surface 18 of the rotating tube 17, respectively, and proceed spirally along the outer circumferential surface 7 toward the large diameter portion of the fastening tube 3. do. As a result, the rotating cylinder 17 also moves in the same direction. When the rotating tube 17 moves toward the larger diameter portion in this way, the fastening tube 3 moves toward the rotating tube 17.
As a result, it is compressed via the roller 27,
Fastening I#3 is reduced in 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 tightening the object to be held by contracting the clamping cylinder 3 by rotating the rotating cylinder 17 as described above, if the rotating cylinder 17 is located far before the tightening completion position, as shown in FIG. 5(A). As shown in FIG.
It is rotated to a position away from 2.

Thereafter, when the rotary cylinder 17 is moved toward the large diameter portion near the tightening completion position, the roller 38 is moved as shown in FIG. 5(B).
is the rising surface 32 of one convex portion 32 in the positioning ring 31
b, and by the subsequent rotation of the rotating cylinder 17, the roller 38 integrally rotates the positioning ring 3I by the length of the notch 33 by a predetermined angle. When the rotation of the positioning ring 31 is stopped by the ball 34 as shown in FIG. 5(C), the roller 38 is rotated by the disk spring as shown in FIG. 36 is compressed and rides on the upper surface 32c of the convex portion 32. At this time, the rotating cylinder 17
A reaction force acts on the hand that rotates the disk spring 36 to compress the disc spring 36, and the change in force causes the roller 38 to move upward toward the upper surface 32c.
It is possible to know that the situation has been taken over. Thereafter, when the rotating cylinder 17 is further rotated slightly, the roller 38 comes off the convex part 32 and enters the concave part 45, and the positioning ring 31 is moved by the disc spring 36 as shown in FIG. When pushed back, the upper surface 32c of the convex portion 32 comes into contact with the positioning surface 23 of the rotary cylinder 17, and at this time a "click" sound is generated and the vibration is transmitted to the hand rotating the rotary cylinder 17. The movable tube 17 is just moved to the tightening completion position, and the tightening tube 3
Tighten the object to be held with appropriate force.

Next, due to wear of the clamping cylinder 3, rotating cylinder 17, roller 27, etc. due to long-term use, even if the rotating cylinder 17 is rotated to the position shown in FIG. If the tightening is too loose, you can retighten it as follows. First, when the rotary cylinder 17 is further rotated in the tightening direction from the state shown in FIG. 5(E), the roller 38 comes into contact with the rising surface 32b of the next convex portion 32, as shown in FIG. 5(F). After that, the roller 38 compresses the disc spring 36 as shown in FIG. 5(G) and rides on the upper surface 32c of the convex portion 32, and then the roller 38 moves against the convex portion 32 as shown in FIG. 5(H). At the same time, the positioning ring 31 is returned again by the disk spring 36, and the convex portion 32 comes into contact with the positioning surface 23 with a click. As a result, the rotating cylinder 17 moves slightly toward the larger diameter side, and the fastening cylinder 3 moves toward the object to be held 4.
Tighten 0.

Next, when loosening the tightening of the object to be held, the rotating cylinder 17
When reversely rotated from the state shown in Figure 5 (H) in the return direction,
First, the roller 38 touches the convex portion 32 as shown in FIG. 5(1).
The positioning ring 31 is integrally rotated by a predetermined angle by contacting the rising surface 32a of the positioning ring 31. When the rotation of the positioning ring 31 is stopped by the ball 34, the roller 38 compresses the disc spring 36 and rides on the upper surface of the convex portion 32, as shown in FIG. 5(J). In this case, since the rotating cylinder 17 has been moved to the small diameter side by rotating the positioning ring 31 by a predetermined angle as described above, the protrusion 32 can be pushed down by the roller 38 with a small force. can. After that, rotating tube 1
7 is further rotated in the return direction, the roller 38 moves to the convex portion 3.
2, and the roller 38 is moved away from the protrusion 32 as shown in FIG. 5(L). As a result, the fastening cylinder 3 loosens the object to be held.

FIG. 6 shows a different example of the present application, in which the positioning surface 23
The positioning tool 37e is provided by a protrusion 50 integrally provided on
It constitutes a positioning piece. It should be noted that parts that are functionally the same or equivalent to those in the previous figure are given the same reference numerals as in the previous figure with an alpha bent e, and redundant explanations are omitted. In addition, in the present application, the main body may be provided with a positioning piece, and the rotating cylinder may be provided with a positioning ring, and instead of providing elasticity in the positioning ring, the positioning piece may be provided with elasticity. Also good.

(Effects of the Invention) As described above, in the present invention, when holding an object, the object is inserted into the insertion hole of the fastening cylinder 3.
By rotating the rotary cylinder 17 and moving it toward the large diameter part of the fastening cylinder 3, the fastening cylinder 3 is compressed via the roller 27, and the inner peripheral surface of the fastening cylinder 3 The object to be held can be held tightly.

In addition, when rotating the rotating tube 17 to compress the fastening tube 3 as described above, the rotating tube 17 is moved until the tightening tube 3 reaches a predetermined tightening completion position.
When the positioning piece 38 is moved toward the larger diameter side, the positioning piece 38 that is one positioning tool is moved to the positioning ring 31 that is the other positioning tool.
This allows the positioning piece 38 and the protrusion 32 to come into contact with each other to determine the tightening completion position due to the rotation of the rotary tube 17. The object to be held can be tightened with appropriate force. As a result, wear of the fastening cylinder 3, the rotating cylinder 17, etc. due to excessive tightening of the rotating cylinder 17 can be prevented, and the life of the holder can be extended.

Furthermore, even if the positioning piece 38 comes into contact with the convex portion 32 of the positioning ring 31 as described above, so that the completion of tightening can be known, the positioning piece 38 may be damaged due to wear due to long-term use, etc. If the clamping of the object to be held becomes loose when it comes into contact with the convex portion 32, the positioning piece 38 is made to elastically ride over the convex portion 32 of the positioning ring 31, thereby moving the rotating cylinder 17 in the tightening direction. This makes it possible to retighten the object to be held and extend the life of the holder.Furthermore, the degree of retightening can be known by counting the number of times the convex portion 32 has been crossed, allowing for retightening. This prevents over-tightening.

Further, as described above, since the positioning piece 38 is made to ride over the convex part 32 of the positioning ring 31 to rotate the rotary cylinder 17, when the positioning piece 38 is made to ride over the convex part 32, the positioning piece 38 By locking the rotary tube 17 to the convex portion 32, the return rotation of the rotary tube 17 can be prevented, and even when an external force is applied to the rotary tube 17, loosening of the tightening can be prevented and the initial tightened state can be maintained. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a half-sectional view;
Fig. 2 is an exploded perspective view, Fig. 3 is a partially omitted side view, Fig. 4 is a sectional view taken along the line IV-TI, and Figs.
L) is an operation explanatory diagram showing the positioning tool unfolded, and FIG. 6 is a perspective view showing a different example. 1... Main body, 3... Tightening cylinder, 4... Insertion hole, 17
...Rotating tube, 27...Roller, 31...Positioning ring, 32...Protrusion, 38...Roller (positioning piece)
.

Claims (1)

[Claims] One end of the main body of the holder in the axial direction has a hollow cylindrical shape that can be elastically deformed in the radial direction, and one end is open to serve as an insertion hole for the object to be held, and the outer peripheral surface is thicker toward the main body. A fastening tube having a tapered surface that becomes the diameter is provided coaxially with and integrally with the main body, and a rotary tube is arranged around the fastening tube so as to be relatively rotatable. At the same time, there is a space between the outer circumferential surface of the fastening tube and the inner circumferential surface of the rotating tube so that the rotating tube can be moved in the axial direction of the tightening tube by rotating the rotating tube with respect to the tightening tube. A large number of rollers are interposed,
On the other hand, the main body and the rotating tube are provided with positioning portions at opposing positions in the axial direction of the fastening tube to prevent the rotating tube from leaning too close to the main body. is moved toward the larger diameter side of the clamping cylinder to contract the clamping cylinder, and by bringing the positioning part of the rotary cylinder into contact with the positioning part of the main body, the tightening by the rotary cylinder is completed. In the holder, between the positioning part of the rotary cylinder and the positioning part of the main body, one of the positioning rings is annular and has a plurality of protrusions in the circumferential direction on its surface, and the other is the positioning ring. A pair of positioning tools comprising a positioning piece disposed at a position facing the convex portion of the clamping tube are interposed, and at least one of the pair of positioning tools is provided with elasticity in the axial direction of the fastening tube. , One of the above positioning tools is stopped by the main body and the other by the rotating cylinder, and the distance between the positioning ring and the positioning piece is such that the rotating cylinder is moved toward the larger diameter side of the tightening cylinder until the tightening is completed position. A holder characterized in that the positioning piece is set so as to come into contact with a convex portion of the positioning ring when the positioning ring is moved.