Device for holding workpiece and machine tool

Patent metadata

Field	Value
Publication number	US-9925630-B2
Application number	US-201514803327-A
Country	US
Kind code	B2
Filing date	Jul 20, 2015
Priority date	Jul 25, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

Provided is a device that prevents a workpiece from sticking to a clamp part and moving with the clamp part to a position deviating from a predetermined position. The device for holding the workpiece includes: a seat on which the workpiece is seated; a clamper that is movable with respect to the seat; a clamp part that is movably supported by the clamper and is configured to hold the workpiece at a clamp position with respect to the clamper in such a manner that the clamp part is pressed against the workpiece by an operation of the clamper so that the workpiece is held between the clamp part and the seat; and a biasing part that is configured to bias the clamp part to move the clamp part from the clamp position when the clamp part is at the clamp position.

First claim

What is claimed is:

1. A device for holding a workpiece, comprising:
a seat on which the workpiece is seated;
a clamper movable relative to the seat;
a clamp part movably supported by the clamper, the clamp part having a planar, flat surface that is pressed against the workpiece by an operation of the clamper so as to be arranged at a clamp position with respect to the clamper and holding the workpiece between the clamp part and the seat; and
a biasing part coupled to the clamper and located adjacent to the clamp part which biases the clamp part by applying force in a direction parallel to the plane of the planar, flat surface of the clamp part when the clamp part is arranged in the clamped position so as to move the clamp part from its clamp position to a non-clamp position.

2. The device of claim 1 , wherein the biasing part includes a spring.

3. The device of claim 1 , wherein the seat includes an engagement part which engages the workpiece so as to prevent the workpiece from moving relative to the seat.

4. A machine tool comprising the device of claim 1 .

5. A device for holding a workpiece, comprising:
a seat on which the workpiece is seated;
a clamper movable relative to the seat;
a clamp part movably supported by the clamper, the clamp part having a planar, flat surface that is pressed against the workpiece by an operation of the clamper so as to be arranged at a clamp position with respect to the clamper and holding the workpiece between the clamp part and the seat; and
a biasing part coupled to the clamper and located adjacent to the clamp part which biases the clamp part by applying force in a direction parallel to the plane of the planar, flat surface of the clamp part when the clamp part is arranged in the clamped position so as to move the clamp part from its clamp position to a non-clamp position wherein the biasing part is elastically deformed to bias the clamp part when the biasing part is arranged at the clamp position, wherein the biasing part includes:
an annular first portion attached to the clamper so as to surround the clamper; and
a second portion extending from the first portion so as to be connected to the clamp part.

6. A device for holding a workpiece, comprising:
a seat on which the workpiece is seated;
a clamper movable relative to the seat;
a clamp part movably supported by the clamper, the clamp part having a planar, flat surface that is pressed against the workpiece by an operation of the clamper so as to be arranged at a clamp position with respect to the clamper and holding the workpiece between the clamp part and the seat; and
a biasing part coupled to the clamper and located adjacent to the clamp part which biases the clamp part by applying force in a direction parallel to the plane of the planar, flat surface of the clamp part when the clamp part is arranged in the clamped position so as to move the clamp part from its clamp position to a non-clamp position wherein the biasing part is elastically deformed to bias the clamp part when the biasing part is arranged at the clamp position, wherein
a central axis of an inner periphery of the second portion does not coincide with a central axis of the first portion.

Assignees

• Fanuc Corp

Inventors

• Nagatomi Takashi

Classifications

• B23Q1/545

  comprising spherical surfaces · CPC title

• B23Q3/06 Primary

  Work-clamping means · CPC title

• B23Q3/069 Primary

  for pressing workpieces against a work-table · CPC title