JPH042362B2 - - 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. A mounting tube is formed into a tapered shape, and a large number of rollers that do not intersect these axes but form an appropriate inclination angle with respect to the axes are arranged over a wide range between a rotary tube and a fastening tube that fit into the tube. The present invention also relates to a holder in which a rotating cylinder is rotated so that a roller rotates and revolves in a spiral manner, thereby causing a tightening cylinder to contract.

(Prior art) A conventional holder is one in which a guide tube with a large number of guide holes is provided between a fastening tube and a rotating tube, and one roller is provided in each guide hole. In the case of manufacturing guide tubes, there is a problem in that it is very time-consuming to form a large number of guide holes one by one.Furthermore, the density of rollers per length of the guide tube is low, and the rollers from the rotating tube are difficult to form. There was a problem in that the tightening force that could be applied to the clamping cylinder via the clamp was relatively weak.

(Problems to be Solved by the Invention) This invention eliminates the above-mentioned conventional problems, makes it possible to easily manufacture the guide tube, and moreover, increases the housing density of rollers per length of the guide tube, making it possible to rotate. It is an object of the present invention to provide a holder that can exert a large tightening force from a cylinder to a fastening cylinder.

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.

(Example) Below, drawings showing examples of the present application will be described. In FIGS. 1 to 5, 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. 3 is main body 1
This is a fastening cylinder that is integrally connected to one end of the fastening cylinder, and is configured to be elastically deformable in the radial direction, and has an insertion hole 4 formed inside thereof for inserting an object to be held.
Reference numeral 5 indicates a fastening surface on the inner circumferential surface of the fastening tube 3, on which a large number of grooves 6 are formed obliquely with respect to the axis of the fastening tube 3, as shown in the figure. 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. Next, reference numeral 17 denotes a rotary cylinder disposed on the outer peripheral side of the fastening cylinder 3, and its inner peripheral surface 18 is formed in a tapered shape parallel to the outer peripheral surface 7. Further, a well-known spanner groove 19 is formed on the outer peripheral surface. Next, tightening tube 3
The members disposed between the rotary cylinder 17 and the rotary cylinder 17 will be explained. Reference numeral 21 denotes a guide cylinder, in which a plurality of guide holes 22 are formed, and each guide hole 22 has a large number of rollers 2.
4 are positioned rotatably. The guide edge 23 of the guide hole 22 is twisted at an angle α with respect to the central axis 31 of the guide tube 21, as shown in FIG. 25 is a rubber seal for dustproofing, 26 is a ring for holding the seal, and 27 is a circlip for prevention.

Next, a description will be given of an operation for holding the cutter 32 (which may be a workpiece), which is exemplified as an object to be held, using the holder configured as described above. First, the base of the cutting tool 32 is inserted into the insertion hole 4. Next, the rotating cylinder 17 is rotated clockwise in FIG. Then, the large number of rollers 24 are pushed by the guide edge 23 and rotate in a twisted position relative to the central axis 31. Therefore, by rotating the rotating cylinder 17, the large number of rollers 24 While rolling between the outer circumferential surface 7 and the inner circumferential surface 18, they proceed spirally along the outer circumferential surface 7 toward the large diameter portion 8. As a result, the rotating cylinder 17 also moves in the same direction. When the rotary tube 17 advances toward the large diameter portion 8 in this manner, the fastening tube 3 is compressed by the rotary tube 17 via the roller 24, and the diameter of the fastening tube 3 is reduced. As a result, the fastening surface 5 comes into close contact with the outer circumferential surface of the cutting tool 32, and tightly fastens it.

When the fastening cylinder 3 is contracted by rotating the rotary cylinder 17 as described above, the guide hole 22 in the guide cylinder 21 is formed to be long in the axial direction of the fastening cylinder 3, as shown in FIGS. 3 and 5. A plurality of rollers 24 are closely housed therein in the axial direction, and a guide cylinder 21
Since the guide hole 22 is widened in the circumferential direction and a plurality of rollers 24 are lined up therein, the load applied to each roller is small, and local fatigue of the roller 24 and the clamping cylinder 3 is also reduced. Reduced. Further, when the load per roller is kept constant, a larger contraction force can be applied to the clamping cylinder 3, and the gripping force of the object to be held can be increased.

Furthermore, since the guide holes 22 are arranged as shown in FIG. 3 and the many rollers 24 are arranged in a staggered manner, the trajectory of the many rollers 24 rolling on the outer circumferential surface 7 of the fastening tube 3 is smooth. They are offset from each other, so that there is no surface on the outer circumferential surface 7 that the rollers 24 do not touch, thereby preventing uneven wear of the outer circumferential surface 7 and ensuring long-term function.

Next, FIGS. 6 to 9 showing different embodiments of the present application will be described.

First, FIGS. 6 and 7 show an example in which a large number of rollers are arranged in a staggered manner by using long rollers 24a and short rollers 24b.

Next, FIGS. 8 and 9 show rollers 24 of the same size.
This shows an example using e.

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 you want to hold an object, when you insert the base of the object into the insertion hole 4 of the fastening tube 3 and turn the rotating tube 17, A large number of rollers 24 in a twisted positional relationship with the fastening cylinder 3 roll and move in a spiral on the outer circumferential surface 7 of the fastening cylinder 3 to rotate the rotating cylinder 1.
7 to the larger diameter side of the clamping cylinder 3, and as a result, the clamping cylinder 3 is contracted, and its inner peripheral surface 5 can clamp and hold the base of the object to be held.

Moreover, in the above case, the direction of rolling movement of each of the rollers 24 can be guided by the hole edge 23 of the guide hole 22 in the guide tube 21, so that the movement can be performed accurately, and the accuracy of the tightening can be improved. There are benefits to be gained. Moreover, the length of the guide hole 22 in the axial direction of the fastening tube 3 is longer than that of one roller 24, and each guide hole 22 has a plurality of rollers 24 arranged closely in parallel in the axial direction. Because of the structure, firstly, each roller 24 can be prevented from being displaced in its axial direction and can be accurately moved along a predetermined movement trajectory,
Of course, this has the effect of making the above-mentioned precise fastening possible. Secondly, when processing the guide holes 22 of the guide tube 21, the guide holes 22 for a plurality of rollers lined up in the axial direction are formed into one guide hole 22. It has the advantage that it can be processed as a guide hole with good workability, and furthermore, this means that the width of one guide hole 22 (the length in the circumferential direction of the fastening tube 3) can be adjusted by arranging a plurality of rollers 24 side by side. Even when the width is set as wide as possible, there is an effect that a large number of rollers 24 arranged in the axial direction and the width direction can be easily processed as one unit into one guide hole in which the rollers can be accommodated.

Furthermore, since the plurality of rollers 24 are closely arranged in parallel in the long guide hole 22 as described above, the guide tube 2
The arrangement density of the rollers 24 can be increased relative to the length of the rotary cylinder 1, and the rotation cylinder 1 can be arranged at a higher density.
7 can exert a large clamping force on the clamping cylinder 3, which has the effect of increasing the holding force of the object to be held.

[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 right side view of FIG. 1, FIG. 3 is a front view of the guide cylinder and roller, and FIG. FIG. 5 is an enlarged view showing the relationship between the guide hole and the roller, and FIGS. 6 to 9 are views showing different examples of the relationship between the guide tube and the roller. 3... Tightening tube, 4... Insertion hole, 17... Rotating tube, 21... Guide tube, 22... Guide hole, 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 guide tube having a plurality of guide holes is provided between the outer circumferential surface of the tightening tube and the inner circumferential surface of the rotating tube, and and a plurality of rollers disposed in the guide hole, and the edge of each guide hole can guide the rolling direction of the plurality of rollers in a spiral along the outer circumferential surface by rotating the rotating cylinder. In this case, each guide hole in the guide tube is formed to be long in the direction of the axis, and each guide hole in the guide tube is formed to be long in the direction of the axis. A holder characterized by having a plurality of rollers arranged closely in the direction of.