JPH0621810U - Rotary tool with shank - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention is suitable for use in a one-touch type tool holder that is inserted into a holder by applying a force in a direction of inserting into a tool, grasped, and cannot be removed unless a releasing operation is performed. Provide a rotary tool. [Structure] An adjusting screw 3 of a length adjusting rod is provided on an end surface of a straight shank 2 of a rotary tool at a position eccentric from a central axis in parallel with the axial center. If necessary, add locking members such as set screws and nuts. Since the adjusting screw 3 is eccentric even when the rotary tool rotates, the inertial force due to the fluctuation of the rotation speed is not properly received, and the loosening can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool holder that can be easily attached / detached and exchanged, in particular, a rotary tool with a straight shank such as a boring bit or a router bit that is mounted and used in one-touch type.

[0002]

[Prior art]

 The one-touch type tool holder shown in Fig. 8 which is already on the market can be easily inserted and automatically gripped by applying a force in the direction of inserting the tool until the tool comes into contact with the bottom of the center hole of the holder. . This one-touch type tool holder can be moved as it is in the insertion direction, but it cannot be removed unless the release operation is performed in the removal direction. The tool installed in this type of one-touch tool holder has an adjustment screw that can adjust the length at the center of the shank end. When inserting into the holder, the length of the adjusting screw is adjusted using an adjusting gauge, etc. so as to correspond to the depth of the processed hole, and then it is mounted on the holder.

[0003]

[Problems to be solved by the device]

 If the rotation speed of the tool mounted on this holder fluctuates rapidly during machining, the fluctuation causes an inertial force to act on the adjusting screw at the center of rotation of the tool, causing relative rotation with respect to the shank and causing the adjusting screw to move. It enters the shank and shortens the length. As a result, the tool being machined is pushed into the holder by the axial cutting force and pushing force, and the length of the rotary tool is shortened by that amount. There's a problem. The present invention has been made in view of the above problems of the conventional technology, and its purpose is to provide a rotary tool in which the length of the tool does not vary during the machining. is there.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is a tool with a length adjusting rod for use in a one-touch type tool holder, wherein the length adjusting rod is a rotary shaft core of the tool. It is provided at a more eccentric position, and it is desirable to provide a loosening prevention means on the adjusting rod.

[0005]

[Action]

 A rotary tool having a predetermined length is mounted on a one-touch type tool holder, and when a sudden rotation fluctuation occurs, inertial force acts on the tool, and the length adjustment rod is in an eccentric position, so its influence is small. . According to a second aspect of the present invention, the loosening is surely stopped by the loosening preventing means of the adjusting rod.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. First Embodiment As shown in FIG. 1, the straight shank 2 of the boring bit 1 is provided with a screw hole 2a at a position eccentric from the central axis, and a length adjusting screw 3 is screwed therein. There is. Embodiment 2 As shown in FIG. 2, a straight hole 2b is bored in place of the screw hole 2a, and a straight pin 4 is inserted in place of the length adjusting screw. A threaded hole 2c is formed at a right angle from the side surface on the thick side of the straight hole 2b of the straight shank 2, and a set screw 5 to be embedded is screwed and fixed.

Third Embodiment As shown in FIG. 3, the first embodiment is fixed with a set screw 5 from the second side of the first embodiment. In order to protect the threads of the adjusting screw with the set screw 5, it is preferable to interpose a soft metal such as lead. Fourth Embodiment As shown in FIG. 4, in comparison with the first embodiment, a strong spring 6 is inserted in the screw hole 2a and pressure-contacted to one screw thread surface so that there is no gap between the screw threads due to the reaction force of the spring. It is fixed.

Fifth Embodiment As shown in FIG. 5, a short set screw 7 is screwed into the screw hole 2a, the screwing depth is adjusted, and a length adjusting screw 3 is screwed to stop the screw. It is fixed in pressure contact with the screw 7. Sixth Embodiment As shown in FIG. 6, the E-shaped retaining ring 8 is fixed to the first embodiment by adjusting the length and length of the adjusting screw 3. Seventh Embodiment As shown in FIG. 7, the first embodiment has a length adjusting screw 3 and a fixing nut 9 screwed thereto to be fixed.

The operation of the rotary tool thus formed will be described. Insert the length adjustment screw 3 or the one whose rotation tool length is determined by the straight pin 4 into the one-touch type tool holder attached to the main shaft of the machine, and attach the three ends of the adjustment screw or the straight pin 4 end of the one-touch type tool holder. Touch the bottom. It is grasped so that it cannot be pulled out at this point. When the work piece is cut by rotating the main shaft, but the rotational speed changes abruptly on the way, inertial force also acts on the adjusting screw 3. However, since the adjusting screw is eccentric from the center of rotation, the influence of inertial force is not affected and is reduced. In addition, the adjusting screw 3 and the straight pin 4 are fixed with a set screw 5, or pressure contact is made with a spring 6 inserted in the screw hole 2a, or the set screw 7 is inserted into the screw hole 2a, and both are pressed or adjusted. In the case where the E-shaped snap ring 8 is fitted to the screw 3 or the set nut 3 is screwed to the adjusting screw 3, the inertial force can be completely ignored.

[0010]

[Effect of device]

 As described above, the present invention has the following effects. According to the first aspect, the influence of inertial force is reduced, loosening of the adjusting screw is prevented, and there is no fear of fluctuations in the length of the rotary tool, and accurate machining can be performed. According to the second aspect of the invention, the loosening prevention means can surely prevent the loosening, and there is no fear of loosening.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the present invention, in which A is a front view,
B is a sectional view of the adjusting screw portion, and C is an end view of the shank.

FIG. 2 is a vertical sectional view of a second straight pin and a set screw portion of the embodiment.

FIG. 3 is a vertical sectional view of a third adjusting screw and a set screw portion of the embodiment.

FIG. 4 is a vertical cross-sectional view of a fourth adjusting screw portion according to the embodiment.

FIG. 5 is a vertical sectional view of a fifth adjusting screw portion of the embodiment.

FIG. 6 is a vertical cross-sectional view of a sixth adjusting screw portion according to the embodiment.

FIG. 7 is a vertical sectional view of a seventh adjusting screw portion of the embodiment.

FIG. 8 is a vertical sectional view of a one-touch holder.

[Explanation of symbols]

1 Boring Bit 2 Shank 2a Screw Hole 3 Adjustment Screw 4 Straight Pin 6 Spring 5,7 Set Screw 8 E-Type Retaining Ring 9 Set Nut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Inoue 1-1, Nakakoguchi, Oguchi-machi, Niwa-gun, Aichi Prefecture Kanebo Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A tool with a length adjusting rod used for a one-touch type tool holder, wherein the length adjusting rod is provided at a position eccentric from a rotation axis of the tool. . 2. The rotary tool with shank according to claim 1, wherein the length adjusting rod is provided with a loosening prevention means.