JPH0524239U - Tool holder - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the rigidity of a tool holder equipped with an axial positioning mechanism. [Structure] A cam member 5 biased forward by an elastic member 4 is fitted inside a holder body 1 having a chuck portion 2 of a tool attached to the front, and a spiral groove provided on the outer peripheral surface of the cam member 5. The tip of the engaging pin 13 attached to the holder main body 1 is engaged with 6. In the core hole 8 of the cam member 5, a seat 9 is provided in the front.
The key member attached to the holder main body 1 by fitting the shaft member 10 having the above, and exposing the axial long groove 12 provided in the shaft member 10 to the concave cut portion 7 reaching the shaft core provided in the cam member 5. The tip of 15 is fitted into the long groove 12. Further, the operation screw 17 which is brought into contact with the bottom surface 7a of the cut portion 7 is attached to the holder body 1.
Is provided and the operation screw 17 is loosened or tightened to perform positioning in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool holder used for attaching a tool such as a drill, a reamer, and an end mill to a spindle of a machine tool such as a machining center.

[0002]

[Prior Art]

 Generally, in this kind of tool holder, it is necessary to perform axial positioning of the tool, and such a positioning mechanism is conventionally disclosed in, for example, Japanese Patent Publication No. 1-17803. On the side wall surrounding the tool insertion hole, an elongated hole is provided in parallel to the axial direction, and an arm having a plurality of male screws that penetrates the elongated hole and projects from the outer peripheral surface of the holder body is provided. The arm is moved in the axial direction to position the tool by rotating the adjustment nut that is mounted so that it can move but cannot move in the axial direction.

[0003]

[Problems to be solved by the device]

 However, in such a conventional example, a long hole must be provided in a part of the holder main body, a space for mounting the adjustment nut is required, and the entire length is increased by protruding by that amount. There is a problem in that the rigidity of the tool holder deteriorates, and it is particularly unsuitable for heavy cutting using an end mill.

An object of the present invention is to provide a tool holder excellent in rigidity, because it is not necessary to provide a long hole in a part of the holder main body, and a space for mounting an operating member such as an adjust nut is unnecessary. It is in.

[0005]

[Means for Solving the Problems]

 A tool holder according to the present invention for achieving the above-mentioned object is a holder main body having a chuck portion for holding a tool in the front, and a holder body rotatably fitted in a central hole in the axial direction thereof. A cam member having a spiral groove and a concave notch reaching a shaft center in a part, an elastic member for biasing the cam member forward, and a tool rotatably fitted in a core hole of the cam member, A shaft member having a long groove in the axial direction in the abutting seat and a portion exposed to the notch, an engagement pin for attaching the tip of the holder to the spiral groove, and a tip for attaching to the holder. A key member that engages with the long groove, and an operating screw that attaches to the holder body and abuts the bottom surface of the cut portion at a position where the tip is eccentric from the shaft center. is there.

[0006]

[Action]

 With the tool holder having the above-described configuration, the cam member, which is biased forward by the elastic member when the operating screw is loosened, is rotated around the shaft member by the spiral groove, while the cam member is axially moved along with the shaft member. When the operation screw is tightened, the cam member rotates in the opposite direction, overcomes the biasing force of the elastic member, and moves backward together with the shaft member.

[0007]

【Example】

 The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows an embodiment of a tool holder according to the present invention, and FIG. 2 is a sectional view taken along the line AA. The holder body 1 has a taper part 1a to be inserted into a main shaft of a machine tool in the rear, a flange part 1b in the middle, and a cylindrical part 1c to which a chuck part 2 for holding a tool is attached in the front, and a step in the axial direction. A central hole 3 is provided. Here, as the chuck portion 2, various types disclosed in, for example, Japanese Utility Model Publication No. 62-46509 and Japanese Utility Model Publication No. 3-9914 can be used.

A substantially cylindrical cam member 5 biased forward by an elastic member 4 such as a coil spring is fitted in the central hole 3 in the inner portion of the chuck portion 2. FIG. 3 shows the cam member 5, and FIG. 3 (b) shows a state rotated by about 90 degrees from the state of (a). As shown in FIG. 3, the cam member 5 is provided with a spiral groove 6 having an inclination angle θ on a part of its outer peripheral surface, and on the opposite side of the spiral groove 6, a substantially axial center is formed in a direction perpendicular to the axial direction. The notch 7 reaching up to is recessed. The groove shape of the spiral groove 6 may be a semicircular shape, a rectangular shape, or a combination of both shapes. Furthermore, it is desirable that the inclination angle θ of the spiral groove 6 be approximately 30 degrees or more in consideration of operability. Incidentally, the spiral groove 6 formed in the cam member 5 can be easily machined with an arbitrary inclination angle by synchronizing the rotation of the circular table with the X axis on the machining center.

A core hole 8 penetrating in the axial direction is provided in the shaft core of the cam member 5, and a shaft member 10 having a seat 9 at the front is fitted therein. The cam member 5 is fixed to the shaft member 10 in the axial direction by a retaining ring 11, but the rotation direction is free. A part of the shaft member 10 is exposed at the cut portion 7, and the exposed portion is provided with a long groove 12 in the axial direction.

As shown in FIG. 2, an engaging pin 13 is screwed into the holder main body 1 in a direction perpendicular to the axial direction, the tip of which engages with the spiral groove 6, and the engaging pin 13 serves to prevent loosening. The screw 14 prevents the falling off from occurring twice. On the other hand, a key member 15 whose tip engages with the long groove 12 of the shaft member 10 is screwed into the opposite side of the holder body 1, and this key member 15 is locked by a locking screw 16 so as not to fall off. Further, along with the key member 15, the operation screw 17 is screwed in at a position slightly eccentric from the shaft center, and the rounded tip is in contact with the bottom surface 7a of the cut portion 7. An operating portion 18 such as a hexagonal hole into which a hexagonal spanner is inserted is provided at the outer end of the operating screw 17. The engagement pin 13, the key member 15 and the operation screw 17 are inserted from the bottom surface of the key groove 19 provided in the flange portion 1b of the holder body 1, but not limited to the key groove 19, for example, as shown in FIG. As shown in FIG. 4, it may be inserted from the concave portion 20 of the flange portion 1b.

Next, the operation will be described. First, the tool is put in the chuck portion 2 and the rear end of the tool is brought into contact with the receiving seat 9 of the shaft member 10. FIG. 1 shows the middle of the adjustment range, and when the tool is projected forward from this state, that is, when the tool is moved to the right side of FIG. 1, the operation screw 17 is loosened. Then, the cam member 5 is pushed by the elastic force of the elastic member 4 and moved forward while being rotated by the spiral groove 6. At this time, since the shaft member 10 is prevented from rotating by the cam member 5, the cam member 5 pushes the seat 9 while rotating around the shaft member 10 to move the shaft member 10 together in the axial direction. , Project the tool forward. Next, when the tool is retracted, that is, when the tool is moved to the left side in FIG. 1, the operation screw 17 is tightened. Then, the bottom surface 7a of the cut portion 7 is pushed, the cam member 5 rotates about the shaft center, overcomes the elasticity of the elastic member 4, and moves to the left side in the axial direction of FIG. 1 by the spiral groove 6.

In this case as well, the receiving seat 9 does not rotate in the same manner, but only moves in the axial direction together with the cam member 5. In this way, by loosening or tightening the operation screw 17, positioning in the axial direction can be easily performed.

Since the elastic force of the elastic member 4 is not less than the mass of the tool, the elastic force is not so large. However, when the twist direction of the spiral groove 6 is reversed, the contact surface of the operation screw 17 is also 180 degrees opposite to the shaft center. When the cam member 5 moves in the axial direction while rotating, rotational friction is generated between the cam member 5 and the non-rotating seat 9, but in order to reduce the rotational friction, as shown in FIG. By interposing the thrust bearing 21 in the above, the operation can be performed more smoothly. When measuring with a tip such as a drill, the tip position does not change even if the cam member 5 rotates. In such a case, the seat 9 may be omitted.

[0014]

[Effect of the device]

 As described above, the tool holder according to the present invention does not need to have a long hole for positioning in the holder body unlike the conventional tool holder with a positioning mechanism, and does not require a space for installing an adapter nut. The rigidity of the entire tool holder can be increased. In addition, since the mechanism is simple, the cost is also easy and it is advantageous for downsizing.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of a cam member.

FIG. 4 is a sectional view of another embodiment.

FIG. 5 is a partial cross-sectional view of another embodiment.

[Explanation of symbols]

 1 Holder Main Body 2 Chuck Part 4 Elastic Member 5 Cam Member 6 Spiral Groove 7 Notch Part 9 Seat 10 Shaft Member 12 Long Groove 13 Engaging Pin 14 Locking Screw 17 Operation Screw 21 Thrust Bearing

Claims (1)

[Scope of utility model registration request] 1. A holder body having a chuck portion for holding a tool in the front, and a holder body which is rotatably fitted in a central hole in the axial direction of the holder body and has a concave shape reaching a spiral groove and a shaft core in a part of an outer peripheral surface. A cam member having a notch portion, an elastic member for biasing the cam member forward, a seat that rotatably fits in a core hole of the cam member, and is in contact with the tool, and exposed to the notch portion. A shaft member having a long groove in the axial direction in a portion, and an engagement pin for attaching the tip end portion to the holder body to the spiral groove,
A key member for engaging a tip of the attachment with the long groove on the holder body; and an operation screw for abutting the bottom of the notch on the holder body at a position eccentric from the axis. And tool holder.