Machine tool

Patent metadata

Field	Value
Publication number	US-2016229012-A1
Application number	US-201615017073-A
Country	US
Kind code	A1
Filing date	Feb 5, 2016
Priority date	Feb 9, 2015
Publication date	Aug 11, 2016
Grant date	—

Abstract

A machine tool includes: a lower tool rest on which a plurality of tools are mounted; a motor provided at the lower tool rest, for rotating a rotating tool when the rotating tool is mounted on the lower tool rest; and a tool holder attached to the lower tool rest, for detachably holding the tool. The tool holder has a clamping mechanism portion operating between a clamping state of clamping the tool and an unclamping state of unclamping the tool, as a result of transmission of motive power generated at the motor. With such a configuration, the clamping mechanism portion for automatically clamping and unclamping the tool held in the tool holder on the tool rest is provided with a simple configuration.

First claim

What is claimed is:

1 . A machine tool comprising:
a tool rest on which a plurality of tools are mounted; a motor provided at the tool rest, for rotating a rotating tool when the rotating tool is mounted on the tool rest; and a tool holder attached to the tool rest, for detachably holding the tool, wherein the tool holder has a clamping mechanism portion operating between a clamping state of clamping the tool and an unclamping state of unclamping the tool, as a result of transmission of motive power generated at the motor.

2 . The machine tool according to claim 1 , wherein
the tool holder further has a clutch shaft to which rotation is input from the motor, a decelerating mechanism portion decelerating the rotation input to the clutch shaft, and a motion converting mechanism portion converting the rotation decelerated by the decelerating mechanism portion into linear motion and transmitting the linear motion to the clamping mechanism portion.

3 . The machine tool according to claim 2 , wherein
the motor has a rotor shaft provided with an engagement groove which the clutch shaft engages, and outputting the rotation to the decelerating mechanism portion, the tool rest has a ring member provided with an annular groove extending circumferentially and being continuous to the engagement groove, and the clutch shaft is provided so as to be movable between the engagement groove and the annular groove when swivel indexing of the plurality of tools mounted on the tool rest is performed, and the motion converting mechanism portion operates the clamping mechanism portion when the rotation input from the motor to the clutch shaft is equal to or greater than 180°.

4 . The machine tool according to claim 3 , wherein
the decelerating mechanism portion includes an output shaft provided with a groove portion and outputting the rotation to the motion converting mechanism portion, the motion converting mechanism portion includes a rotation input member to which the rotation is input from the output shaft, the rotation input member having a key portion engaging the groove portion, and between the key portion and a groove wall of the groove portion, a gap is provided in a rotation direction of the output shaft.

5 . The machine tool according to claim 3 , wherein assuming that θ represents a rotation angle of the output shaft in a range where the rotation input from the motor to the clutch shaft does not cause the clamping mechanism portion to operate, and R (the number of input rotations/the number of output rotations) represents a reduction ratio of the decelerating mechanism portion, a relationship of θ>180°×1/R is satisfied.

6 . The machine tool according to claim 2 , further comprising
a control portion controlling the rotation of the motor, wherein the control portion controls the rotation of the motor such that an upper limit output of the motor when the clamping mechanism portion is operated is smaller than an upper limit output of the motor when the rotating tool is rotated.

Assignees

• Dmg Mori Co Ltd
• Alpstool Co Ltd

Inventors

• Fujimoto Koji
• Kuriya Tatsuhiko
• Miyairi Shuji
• Tanaka Masayoshi

Classifications

• B23Q3/15713

  a transfer device taking a single tool from a storage device and inserting it in a spindle (B23Q3/15793 takes precedence) · CPC title

• B23Q3/15553 Primary

  Tensioning devices or tool holders, e.g. grippers (driving working-spindles and adjusting or stopping them in a predetermined angular position B23Q5/20; securing milling cutters to the driving spindle in a given angular position B23C5/26) · CPC title

• Y10T29/5155

  Rotary tool holder · CPC title

• Y10T29/5167

  Lock means for tool or work turrets · CPC title

• Y10T82/2506

  And tool turret · CPC title