JPH09216109A - Tool holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holding device possessing excellent workability. SOLUTION: A tool holding device is constructed in such a way as fitting a tool holder 20 provided with a tool at the tip into a base member 1 arranged in a main spindle 35 of a machine tool, extending a claw member 4 arranged in the base member 1 by means of a cam action based on an eccentric wheel part in an eccentric cam pin 5, clamping the tool holder 20 by means of the claw member 4, and connecting the base member 1 and the tool holder 20 together. In this case, the eccentric cam pin 5 is positioned in the predetermined position toward the base member 1 and toward the tool holder 20 so that the tool holder 20 can be extracted from the base member 1 while a wrench is connected to a connection part in which the wrench for rotating the eccentric cam pin 5 is continuously arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holding device for holding tools such as end mills, reamers, borings, drills and taps.

[0002]

2. Description of the Related Art The applicant has already filed Japanese Patent Application No. 7-105714 (hereinafter referred to as a conventional example) as a tool holding device.

This conventional example has the structure shown in FIGS.
When the hexagonal wrench 110 is inserted into the hexagonal hole 109 at the top of the eccentric cam pin 101 and the eccentric cam pin 101 is rotated, the cam member of the eccentric ring portion of the first eccentric cam portion 101a causes the tubular member 105 to move to the left side in FIGS. To the base member 1
03 and the tool holder 104 having a collet chuck for holding a tool at its tip are connected to each other, and when the eccentric cam pin 101 is further rotated, the divided body 106a, by the cam action of the eccentric ring portion of the second eccentric cam portion 101b, 106b moves to the left side in FIGS. 8 and 9, the divided bodies 106a and 106b abut on the tip taper portion 111a of the screw rod body 111 to expand, and the claw member 102 is expanded by the expansion of the divided bodies 106a and 106b. Further expanding (FIGS. 8 and 9 show this state), the tool holder 104 is pulled into the base member 103 by the taper action of the taper portion 107 and the taper locking portion 108, and the tool holder 104 and the base member 103 are separated from each other. The unity will be solid.

The inventors of the present invention have made various tests, and have confirmed that this conventional example has the following drawbacks.

In this conventional example, a hexagon wrench 110 for rotating the eccentric cam pin 101 is provided with a hexagonal hole 109 for the eccentric cam pin 101.
When the hexagon wrench 110 is fitted into the base member 103,
And the peripheral wall 104a of the tool holder 104 are inserted into the hexagonal hole 109 so that even if the claw member 102 is contracted to release the coupling between the base member 103 and the tool holder 104, the tool holder In order to pull out 104 from the base member 103, the hexagon wrench 110 must be once pulled out from the hexagonal hole 109.If the hexagonal wrench 110 is still fitted in the hexagonal hole 109 of the eccentric cam pin 101, the tool holder 104 will be pulled out from the base member 103. Since it does not exist, the workability is very poor.

Further, this conventional example has a base member because of its structure.
A hole for inserting the hexagon wrench 110 is required in both the peripheral wall 103a of 103 and the peripheral wall 104a of the tool holder 104, and for this hole, the peripheral wall 103a of the base member 103 and the peripheral wall 104a of the tool holder 104 are required.
There is also a drawback that the peripheral wall 104a of the tool holder 104, in particular, is inferior in strength because the peripheral wall 104a of the tool holder 104 is thin.

The present invention provides a tool holding device that solves this problem.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

A tool holder 20 having a tool attached to the tip is fitted in the base member 1 attached to the main shaft 35 of the machine tool, and the claw provided on the base member 1 by the cam action of the eccentric ring portion of the eccentric cam pin 5. The member 4 is expanded and the tool holder 20 is
A tool holding device for holding the base member 1 and the tool holder 20 together by holding the wrench 40 in a continuous portion in which a wrench 40 for rotating the eccentric cam pin 5 is continuously provided. An eccentric cam pin 5 for the base member 1 and the tool holder 20 so that the tool holder 20 can be pulled out from the base member 1.
The present invention relates to a tool holding device characterized in that the position of is set to a predetermined position.

In the tool holding device according to claim 1,
The present invention relates to a tool holding device characterized in that a hexagonal wrench 40 is used as the wrench 40 and a hexagonal hole 33 is adopted as a continuous installation portion for continuously arranging the wrench 40.

[0011]

The operation and effect of the present invention The base member so that the tool holder 20 can be pulled out from the base member 1 in a state where the wrench 40 is connected to the connecting portion for connecting the wrench 40 for rotating the eccentric cam pin 5. Since the position of the eccentric cam pin 5 with respect to the tool holder 20 and the tool holder 20 is set to a predetermined position, the tool holder 20 can be pulled out from the base member 1 even when the wrench 40 is connected to the connecting portion. Tool holder from 1
It is not necessary to release the continuous connection between the continuous installation part and the wrench 40 each time the 20 is pulled out, and the tool holding device has excellent workability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

The present embodiment is the tool holding device shown in FIGS. 1 to 7.

The tool holding device according to this embodiment comprises a cylindrical base member 1 fitted to a spindle 35 of a machine tool, and a tool 3 at the tip.
0, for example, a cylindrical tool holder 20 in which a collet chuck (not shown) that holds a drill is installed, and is configured by fitting the tool holder 20 to the base member 1.

The base member 1 is provided with a collar portion 28, and this collar portion 28
28 is a bolt hole 21 for attaching to the spindle 35 of the machine tool
4 are provided, and projecting pieces 29, 31 are provided on the inner surface of the base member 1 so as to face each other.

A holding member 2 having a notch 32 in the center is fitted inside the base member 1, and a hole through which the eccentric cam pin 5 penetrates at the notch 32 position of the holding member 2.
A fitting groove 17 into which the pressing member 3 having the 16 is fitted is provided, and a support hole 36 that penetrates and supports the eccentric cam pin 5 is provided at the center of the fitting groove 17, and both sides of the holding member 2 are provided. The portion 2a is provided with holes 18 and 19 through which the eccentric cam pin 5 penetrates, and at the base of the cutout portion 32 of the holding member 2, there is provided a lock receiving portion 13 for locking a claw member 4 which will be described later. Has been.

The eccentric cam pin 5 is provided with a first eccentric cam portion 24 in the central portion, and second eccentric cam portions 25 and 26 having the same cam shape are provided on both sides of the first eccentric cam portion. A hexagonal hole 33 for rotating the eccentric cam pin 5 with a hexagonal wrench 40 or the like is provided at one end of 5.

The first eccentric cam portion 24 of the eccentric cam pin 5 raises and lowers the pressing member 3, and the second eccentric cam portions 25 and 26 raise and lower the holding member 2. It should be noted that the provision of the two second eccentric cam portions 25 and 26 on both sides of the first eccentric cam portion 24 as the cam portions for raising and lowering the holding member 2 in this manner is for consideration of raising and lowering the holding member 2 uniformly. is there.

When the tool holder 20 is pulled out from the base member 1, the eccentric cam pin 5 does not interfere with the pulling out, that is, the eccentric cam pin 5 is placed in the holes 18, 19, 16 of the holding member 2 and the pressing member 3. So that the first eccentric cam portion 24 is located in the hole 16 of the pressing member 3 and the second eccentric cam portions 25 and 26 are located in the holes 18 and 19 provided on both side portions 2a of the holding member 2, respectively. Is set to.

The cam action of the eccentric cam portion 24 of the eccentric cam pin 5 and the eccentric ring portion of the second eccentric cam portions 25 and 26 is configured to be exerted until the eccentric cam pin 5 rotates about 120 °. There is. In this embodiment, the amount of eccentricity of the first eccentric cam portion 24 and the second eccentric cam portions 25, 26 is made as small as possible, and the ascending / descending amount is made small to increase the pulling force of the holding member 2. There is.

Further, in the cutout portion 32 of the holding member 2 inside the base member 1, a pair of left and right locking portions 14 of the base portion are locked by the locking receiving portion 13 and slid with the base end as a fulcrum. The claw members 4 are arranged so as to face each other, and the auxiliary members 6 are provided on both sides of the claw members 4.
Is provided.

A holding portion 34 is formed at the tip of the claw member 4,
An abutting portion 34a is formed on the inner surface of the holding portion 34, and an expanding taper portion is formed below the contacting portion 34a in FIG. 1 and an expanding taper portion 34b is formed above the abutting portion 34a. Further, a concave portion 8 in which the projecting pieces 29 and 31 are located is provided on the upper outer surface of the holding portion 34 in FIG. 1, and a taper locking portion 10 is extended below the concave portion 8 in FIG. A recessed groove 12 is provided below the taper locking portion 10 in FIG. 1, and the recessed groove 12 is provided with a ring member 7, for example, a spring that pulls the two left and right claw members 4 inward.

An annular brim 27 is provided at the base end of the tool holder 20, and the projecting pieces 29, 31 are provided at the opposing positions of the annular brim 27.
The notches 37 and 38, which are fitted to the base plate and have different depths, are formed. The tool holder is formed by the protrusions 29, 31 and the notches 37, 38.
Reference numeral 20 is fitted to the base member 1 in a non-rotating state.

On the inner surface of the tip of the annular collar 27 of the tool holder 20, there is provided a taper lock receiving portion 11 which is positioned in the recesses 8 of the two left and right claw members 4 and which is locked by the taper locking portion 10. .

Since this embodiment is constructed as described above, it has the following operational effects.

A base member 1 fitted to a spindle 35 of a machine tool
In addition, a tool holder with a tool 30 attached to the tip, for example a drill
Mate 20.

At this time, since the thickness of the protruding piece 29 and the depth of the cutout portion 37 are different from the thickness of the protruding piece 31 and the depth of the cutout portion 38, the tool holder 20 is fitted to the base member 1. There is no wrong direction.

When the hexagonal wrench 40 is fitted into the hexagonal hole 33 of the eccentric cam pin 5 from the state shown in FIGS. 3 and 4 and the eccentric cam pin 5 is rotated, the first eccentric cam portion 24 provided at the center of the eccentric cam pin 5 is The pressing member 3 rotates and pushes the pressing member 3 downward in FIG. 3 by the cam action of the eccentric ring portion. When the pressing member 3 is pushed downward, the tip end of the pressing member 3 abuts on the expanded taper portions 34b of the two left and right claw members 4, and the claw member 4 is spread to the left and right sides with the base end as a fulcrum. The taper locking portion 10 of the claw member 4 and the taper locking receiving portion 11 of the annular flange 27 are locked, and the annular flange 27 is pulled upward in FIG. It is combined with the member 1.

Further, when the eccentric cam pin 5 is rotated, the second eccentric cam portions 25 and 26 provided on both sides of the first eccentric cam portion 24 of the eccentric cam pin 5 are rotated and held by the cam action of the eccentric ring portion. The member 2 is pushed upward in FIG.
3, the two left and right claw members 4 locked by the locking portion 14 are also pushed upward (until the base member 1 and the tool holder 20 come into contact with X ₁ or X ₂ in FIG. 1). As a result, the tool holder 20 locked by the taper locking portion 10 of the claw member 4 and the taper locking receiving portion 11 of the annular collar 27 is further drawn into the base member 1 and the tool holder 20 and the base member 1 And are more firmly coupled, and the state shown in FIGS.

At this time, the first eccentric cam portion of the eccentric cam pin 5
The cam action of the eccentric ring portion of 24 and the second eccentric cam portions 25 and 26 is
Since the eccentric cam pin 5 is configured to be exerted by the time it rotates about 120 °, workability is greatly improved in this respect. That is, since the pressing member 3 is pushed down and the holding member 2 is pushed up by the rotation of the eccentric cam pin 5 in a small range of about 120 °, the workability is greatly improved. Then, when the tool holding device rotates at high speed, the left and right claw members 4 are expanded by the centrifugal force accompanying the high speed rotation, and the annular flange 27 of the tool holder 20 is further expanded from the inner surface to the outer side. The bond between the base member 1 and the base member 1 becomes stronger.

The above is the operation when the tool holder 20 and the base member 1 are connected, and when the connection between the tool holder 20 and the base member 1 is released, the eccentric cam pin 5 is connected to the tool holder 20. The base member 1 is rotated in the opposite direction to the case in which it is connected.

When the eccentric cam pin 5 is rotated in the opposite direction as described above, the second eccentric cam portion 25 of the eccentric cam pin 5,
26 pushes the holding member 2 downward, as a result, the pawl member 4 that is engaged with the holding member 2 is also pushed downward, and further, the first eccentric cam portion 24 pushes the pressing member 3 upward. Therefore, the claw member 4 contracts due to the force of the ring member 7,
The connection between the claw member 4 and the tool holder 20 is released, and the tool holder 20 can be pulled out from the base member 1. At this time, the tool holder 20 can be pulled out from the base member 1 while the hexagonal wrench 40 is still fitted in the hexagonal hole 33 of the eccentric cam pin 5.

As described above, according to the present embodiment, the tool holder 20 and the base member 1 can be simply and firmly connected to each other, and the tool can be inserted into the hexagonal hole 33 of the eccentric cam pin 5 while the hexagonal wrench 40 is still inserted. Since the holder 20 can be pulled out from the base member 1, the workability is extremely excellent in this respect, and the tool holder 20 and the base member 1 can be joined and released from each other by 120 ° of the eccentric cam pin 5. It only needs to rotate and return to a certain degree, and workability is also excellent in this respect, and the eccentric cam pin 5 has two second eccentric cam portions 25,
Since the holding member 2 is formed up and down, the holding member 2 can be lifted and lowered uniformly, and unlike the conventional example, the annular collar 27 of the tool holder 20 does not have a hole for inserting the hexagon wrench 40. Therefore, the strength of the tool holder 20 (strength of the annular collar 27) is increased as compared with the conventional example, and the tool holding device has a simple structure and excellent mass productivity.

[Brief description of drawings]

FIG. 1 is a front sectional view of a main part of a tool holding device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of a tool holding device according to an embodiment of the present invention.

FIG. 3 is a front sectional view of a main part of a tool holding device according to an embodiment of the present invention.

FIG. 4 is a side sectional view of a main part of a tool holding device according to an embodiment of the present invention.

FIG. 5 is a perspective view of a main part of a tool holding device according to an embodiment of the present invention.

FIG. 6 is a perspective view of a holding member of a tool holding device according to an embodiment of the present invention (shown upside down with the holding member shown in FIGS. 1 to 4).

FIG. 7 is a partial cross-sectional view of a base member and a perspective view of a tool holder of a tool holding device according to an embodiment of the present invention.

FIG. 8 is a front sectional view of a main part of a conventional tool holding device.

FIG. 9 is a front sectional view of a main part of a conventional tool holding device.

[Explanation of symbols]

 1 Base member 4 Claw member 5 Eccentric cam pin 20 Tool holder 33 Hexagon socket 35 Spindle 40 Wrench

Claims (2)

[Claims] 1. A base member attached to a main shaft of a machine tool is fitted with a tool holder having a tool attached to its tip, and a claw member provided on the base member is expanded by a cam action of an eccentric ring portion of an eccentric cam pin. A tool holding device for opening and holding a tool holder by the claw member to connect the base member and the tool holder, wherein the wrench is continuously connected to a continuous portion for connecting a wrench for rotating an eccentric cam pin. A tool holding device characterized in that the position of the eccentric cam pin with respect to the base member and the tool holder is set to a predetermined position so that the tool holder can be pulled out from the base member in this state. 2. The tool holding device according to claim 1, wherein a hexagonal wrench is used as the wrench, and a hexagonal hole is used as a connecting portion for connecting the wrenches.