Chucks or sockets – Radially reciprocating jaws – Spiral cam or scroll actuated
Patent
1998-10-20
2000-10-31
Bishop, Steven C.
Chucks or sockets
Radially reciprocating jaws
Spiral cam or scroll actuated
279111, 279126, 279150, 82142, B23B 31163, B23B 3126, B23Q 520
Patent
active
061390283
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a holding chuck of a machine tool or a method for driving chucking jaws thereof. The present invention particularly relates to an electrically driven chuck for a machine tool or a method for driving the chucking jaws thereof, wherein the chucking jaws of the holding chuck are electrically driven by an electric motor which drives the main spindle thereof.
PRIOR ARTS
A chuck for holding a work is mounted on the end portion of the main spindle of a lathe. Recently, the chucking jaws are not manually moved but driven by a driving means.
A hydraulic cylinder or an electric motor is used as such a driving means. An exclusive hydraulic cylinder or an exclusive electric motor is necessary in order for the chucking jaws to be driven.
The addition of such an exclusive means to a machine tool makes its chucking mechanism complex, and brings about higher costs thereof. The inventor of Japanese Patent Disclosure No. Heisei 8-150531, who is identical with the inventor of the present invention, disclosed in that patent an electrically driven chuck wherein no exclusive driving means for driving the chuck is necessary, the commonly used driving means being the electric motor for driving a main spindle.
Such an electrically driven chuck has no driving means, but it has a complex mechanism which includes a ring-like gear located at the circumferential position of the chuck body, the shifting mechanism for changing transmitting channels.
SUMMARY OF THE INVENTION
The present invention has been made with the above-described technical background, and it aims at attaining the following objects.
It is an object of the present invention to provide an electrically driven chuck of a machine tool, and a method for driving chucking jaws thereof which has no need of any driving means to be exclusively used for a holding chuck for holding such as a work.
It is another object of the present invention to provide an electrically driven chuck of a machine tool, and a method for driving chucking jaws thereof, the mechanical system of which is very simplified.
It is still another object of the present invention to provide an electrically driven chuck of a machine tool, and a method for driving chucking jaws thereof, wherein it is very easy to control the opening and closing of a set of chucking jaws.
It is a further object of the present invention to provide an electrically driven chuck of a machine tool, and a method for driving chucking jaws thereof, wherein the force of chucking a work is freely adjustable by corresponding it to the contents of the machining, such as rough machining or finishing machining, and the materials or shape of a work.
The advantage of an electrically driven chuck of a machine tool according to the present invention, which has no exclusive driving means for opening and closing a set of jaws, is that it is not necessary to consider any of the problems with respect to the heat that would be generated by the exclusive driving means, and has a further advantage that a work is held by a voluntary force obtained by a manual key-inputting operation, or by an assigned force designated by an NC-machining program.
DISCLOSURE OF THE INVENTION
A first electrically driven chuck of a machine tool comprises spindle being rotatively supported on a headstock, body, said chuck being mounted on said main spindle, channel of said channels transmitting the rotation of said main spindle to the motion of opening or closing of said holding members, the other channel of said channels transmitting said rotation of said main spindle to the rotations of said main spindle and said chuck as one body, said transmitting channel changing means being located between a body of said machine tool and said chuck, wherein said chuck is relatively fixed with a body of said machine tool, and spindle to said motion of said opening or said closing of said holding members, when said one channel is selected by said transmitting channel changing means, said motion transforming means being mounted
REFERENCES:
patent: 1512078 (1924-10-01), Beck
patent: 2575662 (1951-11-01), Highberg
patent: 3458209 (1969-07-01), Scholz
patent: 3936060 (1976-02-01), Hirao
patent: 4133230 (1979-01-01), Inaba et al.
patent: 4482163 (1984-11-01), Depweg
patent: 4758006 (1988-07-01), Hiestand
patent: 5167175 (1992-12-01), Rohm
Bishop Steven C.
Hitachi Seiki Co., Ltd.
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