JPS6236564Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tool head equipped with a quick change mechanism, and is particularly adapted to accommodate left- and right-hand cartridges for cutting tools.

Hitherto, as this type of tool head, those shown in, for example, Japanese Patent Application Laid-open No. 55-5410 and Japanese Utility Model Application No. 57-140904 are known.

In the former, a central groove is provided at the rear end of the cartridge so that protrusions are formed on both sides.
The enlarged portion of the tow bar is positioned on the stop side of the central groove, and by pulling the tow bar, the protrusion is pressed against the joint surface of the holder body. Therefore,
It is certainly superior in terms of quick operation for attaching and detaching the cartridge. However, the expansion action of the protrusions may result in partial contact unless the machining accuracy is high enough, and great care must be taken to improve positioning accuracy.

In addition, the latter has a configuration in which elastic deformation is applied to the tow bar, so that the cartridge is fixed through primary contact and secondary contact. Therefore, it is excellent in that it does not require much precision in forming the cartridge locking grooves. However, due to the structure of the primary contact and the secondary contact, there was a problem that it could only be applied to cartridges with left and right hands.

For this reason, there is a need for the development of a quick change mechanism that improves the ease of attaching and detaching the cartridge, the mounting strength, and the positioning accuracy, and that can also handle cartridges with left and right hand.

The present invention was developed in view of the above points, and is based on the quick change mechanism found in the aforementioned Japanese Utility Model Publication No. 57-140904, and has been improved so that it can be safely applied to left- and right-handed cartridges. A tool head equipped with a quick change mechanism is provided.

Hereinafter, one embodiment of a tool head equipped with the quick change mechanism of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a tool head main body having an appropriate structure, and one end thereof includes a support step 3 for receiving a cutting tool cartridge 2 and a mounting hole 5 into which a retraction shaft 4 is inserted. are provided for each. In the case shown, support step 3
is formed by a supporter 6 attached to the main body 1.

The cartridge 2 is equipped with an appropriate cutting tip 8 on its holder 7, and when placed on the support step 3, its rear convex portion 9 is connected to the support step 3. It is arranged to be located within the recessed part 10. A pull-in locking groove 11 is formed in this rear convex portion 9, so that bifurcated portions 12, 12 remain.

Further, as clearly shown in FIG. 3, the retraction shaft 4 is provided with a locking head 13 at one end thereof, and also forms a narrow neck portion 14. A threaded portion 15 is provided at the other end of the retraction shaft 4.
is formed, and this threaded portion 15 is screwed into a round nut 17 positioned, for example, by a C-ring 16, thereby enabling a traction action. In this case, in order to increase the mounting strength, the retraction shaft 4 is mounted at an inclination angle of α=2 to 4°.

In this way, the cartridge 2 is
When the pull-in locking groove 11 is placed in the
A locking head 13 of the retraction shaft 4 and a neck portion 14 offset to one side are located. In this case, the locking head 13 of the retraction shaft 4 has inclined side surfaces 18 and 19 connected to it from the neck portion 14,
Furthermore, when the shaft centerline 20 is used as a reference, it is asymmetrical so that it is biased toward one side and its width becomes narrower. As a result, a gap 21 exists between the pull-in locking groove 11 and the pull-in locking groove 11. this is,
When the retraction shaft 4 is towed, one inclined side surface 18 first comes into contact with the symmetrical inclined side surfaces 22, 22 of the retraction locking groove 11, and then the other inclined side surface 19 contacts the symmetrical inclined side surfaces 22, 22 of the retraction locking groove 11, and then the other inclined side surface 19 contacts the symmetrical inclined side surfaces 22, 22 of the retraction locking groove 11. This is because the contact was made with a time difference. Therefore, with the elastic deformation of the retraction shaft 4, the forked portions 12, 12 of the rear protrusion 9 are pressed toward the side walls 23, 23 of the recess 10, and the cartridge 2 is accurately positioned. and can be firmly attached.

Moreover, this retraction shaft 4 can be changed in direction by 180 degrees in order to accommodate the left-right orientation of the cartridge 2. This is achieved by a ball mechanism 25 provided in the side hole 24 of the tool head body 1. In this case, the ball mechanism 25 consists of a ball 26, a coil spring 27, a receiver 28, and a plug screw 29, as clearly shown in FIG. Further, a pair of deep axial grooves 30, 30 and a shallow circumferential groove 31 communicating with the axial grooves 30, 30 are formed on the side of the retraction shaft 4. First, the round nut 17 is rotated to cause the retraction shaft 4 to protrude toward the cartridge 2 side, and when the ball 26 reaches the circumferential groove 31, there is a depression in the end surface of the locking head 13. By using the contacting grooves 32, the direction can be changed by rotating 180 degrees.

As explained above, the present invention is designed so that the retraction shaft that pulls the cartridge is elastically deformed at the locking head and neck part when it is fixed, and also because the retraction shaft can be turned 180 degrees from side to side. It can also be used with custom cartridges.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view showing an embodiment of the tool head equipped with the quick change mechanism of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a perspective view of the retraction shaft, and Fig. 4 is a perspective view of the retraction shaft. The figure is an explanatory view showing the clamping action of the retraction shaft. DESCRIPTION OF SYMBOLS 1... Tool head main body, 2... Cartridge, 3... Support step part, 4... Retraction shaft, 5... Mounting hole, 9... Receiving convex part, 10... Recessed part, 11
... Retraction locking groove, 12 ... Bifurcated part, 13 ...
Locking head, 14... Neck portion, 18, 19... Inclined side surface, 22... Inclined side surface, 23... Side wall, 25...
...ball mechanism, 26...ball.

Claims (1)

[Claims for Utility Model Registration] The tool head body 1 has a support step 3 for receiving a cutting tool cartridge 2 and a mounting hole 5 opening in the rear wall of a recess 10 connected to the support step 3. In addition, within the mounting hole 5, there is a narrow neck portion 14 that is offset to one side, and an inclined side surface 18 on the neck portion 14 side.
The retraction shaft 4, on which the locking head 13 formed with the locking head 19 is configured, moves the locking head 13 into the recess 10.
When the cartridge 2 is inserted so as to project inward, and the cartridge 2 is placed in the support step 3, the retraction shaft 4 is inserted into the retraction locking groove 11 formed in the receiving protrusion 9 of the cartridge 2. When the locking head 13 is located and the retraction shaft 4 is towed, the symmetrical inclined surface 2 of the retraction locking groove 11
2, 22, one inclined surface 18 first contacts, and then the other inclined surface 19 contacts with a time difference as the neck portion 14 elastically deforms, so that the bifurcated portion 12 remaining on the convex portion 9 , 12 are press-fixed toward the side walls 23, 23 of the recess 10. A pair of axial grooves 30, 30 and the axial grooves 30, 30 are provided on the sides.
A shallow circumferential groove 31 communicating with the tool head body 1 is formed, and the tool head main body 1 is provided with a side hole 24 that opens toward one of the axial grooves 30, 30 of the retraction shaft 4. is equipped with a ball mechanism 25, and the ball 26 of this ball mechanism 25 is positioned from one of the axial grooves 30, 30 into the circumferential groove 31 as the retraction shaft 4 moves in the axial direction. When the retraction shaft 4
A tool head equipped with a quick change mechanism, characterized in that the cartridge 2 can be changed in direction by 180 degrees, so that the cartridge 2 can be used in either left or right hand.