JPH0229446B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tool holding device such as an automatic tool changer.

[Conventional technology]

Traditionally, this type of tool holding device was
Publication No. 500373, Japanese Utility Model Application Publication No. 52-86080, etc. are known.

This conventional structure consists of a plurality of claw pieces arranged in an annular shape, including a claw member that can hold and release the pull stud of a tool fitted into a tapered holding hole at the front end of the main shaft, and It is equipped with a drawbar that performs a pushing motion, and a sleeve member that opens and closes the front end of the claw member in accordance with the pushing motion, and the claw member is opened and closed by the pushing motion of the drawbar and the action of the sleeve member. , configured to hold and release the pull stud of the tool.

[Problem to be solved by the invention]

However, in the case of this conventional structure, each constituent claw piece is manufactured by first processing the whole part and then dividing it with a wide and thick slitter, and the difference between each constituent claw piece and the neighboring constituent claw piece is There is a considerable gap between them, and the pawl members are free to move in the circumferential direction by the amount of the gap, which causes imbalance in the pawl members, which is inconvenient in high-speed, high-precision machining.

[Means to solve the problem]

The present invention aims to eliminate these inconveniences, and its gist consists of a plurality of claw pieces arranged in a ring shape, which fit into a tapered holding hole at the front end of the main shaft. The tool includes a claw member that can hold and release the pull stud of the tool, a drawbar that pushes the claw member, and a sleeve member that opens and closes the front end of the claw member in conjunction with the pushing motion. A V-shaped receiving groove is provided on the rear outer periphery of the component claw piece, an abutting part is formed on the rear slope of the receiving groove, and the abutting part to which this abutting part engages is connected to the sleeve member. The opening fulcrum of the constituent claw piece is the front corner of the engagement convex part of the constituent claw piece, which extends over the inner peripheral surface and fits into the engagement groove provided on the front outer circumferential surface of the claw holding part provided on the drawbar. The tool holding device is characterized in that each of the component claws is provided with an abutting protrusion that can maintain the circumferential distance between each of the component claws and the adjacent component claw.

[Effect]

The movement of each of the component claw pieces in the circumferential direction is suppressed by the abutting protrusion pieces.

〔Example〕

1 to 4 show a preferred embodiment of the present invention. Reference numeral 1 denotes a main shaft of a machine tool, etc. The main shaft 1 is stopped rotating by a rotating means (not shown), and a tool 2 is attached to the front end. A tapered holding hole 3 is formed to fit the shank.

A through hole 4 is formed in the center of the main shaft 1, a sleeve member 5 is fixedly installed in the front part, and a drawbar 6 is provided in the center of the through hole 4 so as to be able to push and pull back and forth. rear part and sleeve member 5
A plurality of disc springs 8 are interposed between the rear spring receiving member 7 and the drawbar 6 is constantly pulled rearward by the spring pressure of the disc springs 8.

A pawl holding member 9 is screwed onto the front end of the drawbar 6, a stepped engagement groove 10 is formed on the outer peripheral surface of the front portion, and an extrusion member 11 is screwed onto the front end.

Reference numeral 12 denotes a claw member, and the claw member 12 is formed of four component claw pieces 13, and a tool 2 is provided on the inner circumferential surface of the front end.
A holding part 15 for holding the pull stud 14 is formed, an engagement convex part 16 that engages with the engagement groove part 10 is formed on the rear inner peripheral surface, and a V-shaped receiving groove 17 is formed on the rear outer peripheral surface. The respective component claw pieces 13 are arranged in an annular manner on the claw holding member 9 by engagement between the engagement protrusion 16 and the engagement groove 10, and an elastic ring member 18, for example C A shaped panel ring or an O-ring is fitted, and the holding portion 15 is biased to open using a contact point 19 between the front side of the engagement groove 10 and the front side of the engagement convex portion 16 as a fulcrum.

In this case, the rear inner circumferential surface of the component claw piece 13 is formed into a rear upwardly inclined surface 20, so that the opening operation can be performed smoothly.

Reference numeral 21 denotes an abutting protrusion, which is formed protrudingly from both sides of the respective component claws 13 in the middle, and the contact action of each abutting protrusion 21 causes the respective component claws 13 to move in the circumferential direction. It suppresses migration.

22 is a ring plate that prevents the constituent claw pieces 13 from coming off.

Further, a contact portion 2 is provided on the rear outer peripheral surface of the component claw piece 13.
3 is formed with a tapered front surface.

Further, the claw holding member 9 is installed in the rear part of the inner hole 24 of the sleeve member 5 so that it can be pushed and pulled while being prevented from rotating by a key 25, and the claw member 12 is installed in the front part of the inner hole 24. There is.

Further, the front part of the inner circumferential surface of the inner hole 24 of the sleeve member is formed so that the holding part 15 can open when it is protruded, and the rear part is formed with a stepped part 26 so that the holding part 15 can operate to close and hold when it is pulled. formed through
At its rear part, a tapered abutment part 27 is formed, with which the abutment part 23 comes into contact when the abutment part 23 protrudes.

Since this embodiment has the above-mentioned configuration, when the drawbar 6 is pushed forward by the hydraulic cylinder mechanism (not shown) in the state shown in FIG. and elastic ring member 16
The abutting part 23 is opened by the action of the abutting part 2.
7, the holding part 15 is forcibly opened,
The pull stud 14 is released to provide positive opening action of the pawl member 12.

In this open state, the tool 2 is inserted into the holding hole 3 by the tool changing device.

After insertion, when the hydraulic cylinder mechanism (not shown) is put into a non-operating state, the drawbar 6 is pulled rearward by the spring pressure of the disc spring 8, and the claw member 12 is pulled through the claw holding member 9.
moves backward, and when the holding part 15 enters inward from the stepped part 26, the holding part 15 closes around the contact point 19, and the holding part 15 holds the pull stud 14, pulls the tool 2, and closes the holding hole. 3 and the shank of the tool 2, the tool 2 can be held on the spindle 1.

In this case, when each constituent claw piece 13 is attached to the claw holding member 9 in a ring shape, the movement of each constituent claw piece 13 in the circumferential direction is suppressed by the mutual abutting action of the respective abutting protrusions 21. , the unbalance of the entire claw member 12 due to the free movement of the component claw pieces is suppressed, and high speed,
High-precision machining is possible, and since the abutting protrusion 21 is in the form of a protrusion, the opening and closing operations of the constituent claw pieces 13 can be performed smoothly.

〔Effect of the invention〕

Since the present invention is constructed as described above, the component pawl pieces are pushed forward by the pushing action of the drawbar, and the abutment portion formed on the rear slope of the receiving groove is brought into contact with the corresponding abutment portion on the sleeve member side. When abutting against each other, the distal end of the claw piece acts as an opening fulcrum and is forcibly pushed open, making it easy and sure to release the pull stud of the tool.

In addition, since abutting protrusions are provided on the sides of each constituent claw piece, the abutting protrusions suppress the circumferential movement of each constituent claw piece, suppressing unbalance of the entire claw member, and making it possible to achieve high speed and high speed operation. Precision machining is possible, and since the abutting protrusions are in the form of protrusions, the opening and closing operations of the constituent pawl pieces can be performed smoothly.

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view of the main part, FIG. 2 is an enlarged sectional view of the main part, FIG. 3 is a partial front view of the main part, and FIG. 4 is a configuration. It is a perspective view of a claw piece. 1...Main shaft, 2...Tool, 3...Holding hole, 5...
... Sleeve member, 6 ... Drawbar, 12 ... Claw member, 13 ... Constituent claw piece, 14 ... Pull stud,
21...Abutting protrusion.

Claims (1)

[Claims] 1 Consists of a plurality of constituent claw pieces arranged in an annular shape,
A claw member capable of holding and releasing a pull stud of a tool fitted into a tapered holding hole at the front end of the main shaft, a drawbar that pushes the claw member, and a drawbar that moves the front end of the claw member with the pushing motion. A V-shaped receiving groove is provided on the rear outer periphery of each of the constituent claw pieces, an abutting part is formed on the rear slope of the receiving groove, and the abutting part An abutment part that is engaged and abutted is provided on the inner peripheral surface of the sleeve member. The front corner of the mating convex portion is used as an opening fulcrum for the component claw pieces, and each of the component claw pieces is provided with an abutting protrusion that can maintain the circumferential distance from the adjacent component claw piece. A tool holding device featuring: