JPH0727128Y2 - Rotary tool with shank - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder which can be easily attached and detached and replaced, and more particularly to a rotary tool with a straight shank, such as a boring bit or a router bit which is mounted and used in a one-touch type.

[0002]

2. Description of the Related Art One-touch type tool holders such as those shown in FIG. 3 which are already on the market can be easily inserted until the tool comes into contact with the bottom of the center hole of the holder by simply applying a force in the direction of inserting the tool. To be gripped. This one-touch type tool holder can be moved as it is in the insertion direction, but cannot be removed unless a releasing operation is performed in the removal direction. As the tool mounted on the one-touch type tool holder of this kind, a tool provided with an adjusting screw capable of adjusting the length at the center of the shank end is used. When inserting into the holder, the length of the adjusting screw is adjusted using an adjusting gauge or the like so as to correspond to the depth of the processed hole, and then the adjusting screw is mounted on the holder.

[0003]

When the rotational speed during machining of the tool mounted by this holder fluctuates rapidly, inertial force acts on the adjusting screw at the turning center of the tool due to the fluctuation, but Since no measures against inertial force have been taken,
The inertial force causes relative rotation with respect to the shank, which causes the adjusting screw to enter the shank and shorten the length. Along with this, the tool being machined is pushed into the holder due to the axial cutting force and pushing force, and the length of the rotating tool is shortened by that amount, causing a deviation in the machining hole depth. There is. The present invention has been made in view of the above-mentioned problems of the conventional technology.The purpose of the present invention is to prevent the change in the length of the tool during the machining, which causes a hindrance to the function of the one-touch type tool holder. It is intended to provide no rotating tools.

[0004]

In order to achieve the above-mentioned object, the present invention is a tool with a length adjusting rod member used for a one-touch type tool holder, wherein a hole of the length adjusting rod member is provided from the side. A screw hole that does not penetrate through the hole is drilled, an operation wrench insertion hole with a smaller diameter than this hole is drilled in the bottom of the screw hole, and a set screw with a hole is screwed into the bottom of the screw hole with the wrench fitting hole on the bottom side. The length adjustment screw is fixed by operating the set screw through the wrench insertion hole.

[0005]

[Operation] After adjusting the length of the length adjusting screw, insert the wrench through the bottom insertion hole and rotate the set screw to fix the length adjusting screw. Even if the tool is rotated and a sudden rotation fluctuation occurs and the length adjustment screw moves due to inertial force, it is prevented by the set screw. Further, when the set screw is not tightened, the set screw itself does not project out of the shank due to the stepped portion at the bottom of the screw hole of the set screw.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Example 1 As shown in FIG. 1, the end surface of the straight shank 2 of the boring bit 1 is provided with a screw hole 2a at a position eccentric from the central axis.
Has been drilled. The screw hole 2b is formed from the side surface on the side eccentric so as to cross the screw hole 2a so that the screw hole 2b does not penetrate and the bottom remains. In addition, screw holes 2 from the side opposite to the center of the bottom
A wrench insertion hole 2c having a diameter smaller than that of b, that is, a size in which the hexagonal wrench 5 can be inserted and rotated, is formed. And screw hole 2
a is a length adjustment screw 3 with a hexagonal hole 3a for wrench fitting
Is screwed on. A set screw 4 having a hexagonal hole 4a for fitting a wrench is provided in the screw hole 2b with the hole 4a side as the bottom side.
It is deeply sunk and screwed so that the screw tip does not protrude. If necessary, a soft metal such as lead is interposed at the tip of the set screw 4 so as not to damage the thread of the length adjusting screw 3. Example 2. As shown in FIG. 2, a length adjusting screw is drilled in the center of the boring bit, which is applicable to a large diameter tool. The same reference numerals as those of the first embodiment are attached and the description thereof is omitted.

The first and second embodiments of the present invention having such a configuration
The operation of the rotary tool will be described. First, the length adjustment screw 3 is fitted with the hexagonal wrench 5 in the hexagonal hole 3a of the head and rotated to adjust the protrusion amount so that the predetermined tool length is obtained. Next, insert a hexagonal wrench 5 through the side insertion hole 2c and set screw 4
Is fitted into the hexagonal hole 4a, and the mountain surface of the length / length adjusting screw 3 is pressure-contacted with lead to prevent rotation. Remove the hexagon wrench 5 and insert it into the one-touch type tool holder attached to the main shaft of the machine, and bring the three ends of the length adjustment screw into contact with the bottom of the one-touch type tool holder. It is gripped so that it does not come off at this point.

The work piece is cut by rotating the spindle. If the number of rotations fluctuates abruptly on the way, inertial force also acts on the length adjusting screw 3. However, in the first embodiment, since the length adjusting screw is eccentric from the center of rotation, the influence of inertial force is not affected and is reduced. And set screw 4
Since the length adjusting screw 3 is fixed by the above, the inertial force with respect to the sudden change of the rotation speed can be completely ignored. In the second embodiment, the second length adjusting screw 3 provided at the center of rotation of the tool also has a proper inertial force, but since it is firmly fixed by the set screw 4, there is no fear of loosening.

However, when it is not necessary to adjust the length adjusting screw 3 or when the length adjusting screw 3 is fully inserted, it is conceivable to use it without tightening the set screw, and the loose set screw 4 is rotating. If the direction is on the length / length adjusting screw 3 side, it abuts on the length / length adjusting screw and stops. Screw hole 2 on the contrary
If it is moved to the bottom side of b, the wrench insertion hole 2c has a smaller diameter than the screw hole 2b, so there is no possibility that the set screw 4 protrudes from the shank 2 by being stopped by abutting against the bottom step of the screw hole 2b. . Note that this set screw mechanism can be used in the same way even if a length adjusting rod is used instead of the length adjusting screw.

[0010]

The present invention has the following effects because it is constructed as described above. An eccentric length / length adjusting screw reduces the influence of inertial force due to abrupt rotation and is securely fixed by a set screw.Thus, the synergistic effect allows the length / length adjusting screw to enter the shank. The length will not be shortened and the hole depth will not be affected.
Also, a large-diameter tool provided with a length adjustment screw at the center is fixed by a set screw, so that the length does not change. And, more importantly, the set screw is embedded in the depth of the length adjustment screw of the screw hole with a step at the bottom, so if you do not need to adjust the length adjustment screw or if you want to use the full length adjustment screw. In such a case, it is possible to use without tightening the set screw, but even in such a case, even if the set screw moves during rotation, it is restricted by the length adjustment screw and the bottom step and protrudes out of the shank. There is no fear of the occurrence of accidents, and it is possible to completely prevent an unexpected situation that the one-touch type holder bites and does not come off.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention in which a length adjusting screw is eccentric, A is a side view with a part in section, and B is a plan view.

FIG. 2 is a side view, partly in section, of a second embodiment of the present invention centering on the length / length adjusting screw.

FIG. 3 is a view showing a one-touch type tool holder and a conventional tool with a length / length adjusting screw.

[Explanation of symbols]

 2 Shank 3 Length adjustment screw 4 Set screw 5 Hexagon wrench

Claims (1)

[Scope of utility model registration request] 1. A tool with a length adjusting rod member for use in a one-touch type tool holder, wherein a screw hole that does not pass through the hole of the length adjusting rod member is formed from the side surface, and the bottom of the screw hole is formed. An operating wrench insertion hole with a smaller diameter than this hole is drilled, and a set screw with a hole is screwed into the bottom of the screw hole with the wrench fitting hole on the bottom side. A rotating tool with a shank characterized by fixing a length adjusting screw.