Machine tool

Patent metadata

Field	Value
Publication number	US-2020215617-A1
Application number	US-201716328586-A
Country	US
Kind code	A1
Filing date	Jun 19, 2017
Priority date	Aug 31, 2016
Publication date	Jul 9, 2020
Grant date	—

Abstract

An automatic lathe includes a positioning block that positions a rod material, the rod material projecting from a main spindle contacting the positioning block, and a sensor that moves in a direction intersecting with a shaft center C direction of the main spindle to detect a cut off condition of the rod material. The positioning block includes a groove that allows movement of the sensor, and moves in the same direction as a movement direction of the sensor between a position that contacts the rod material and a position that has no contact with the rod material. The sensor moves along the path in the position that has no contact with the rod material.

First claim

1 . A machine tool comprising:
a positioning member that positions a rod material, the rod material that projects from a main spindle contacts the positioning member to be positioned; and a detector that moves in a direction intersecting with an axis direction of the main spindle to detect a cut off condition of the rod material, wherein the positioning member includes a path that allows movement of the detector, and moves in a same direction as a movement direction of the detector between a position that contacts the rod material and a position that has no contact with the rod material, and the detector moves along the path when the positioning member moves to the position that has no contact with the rod material.

2 . The machine tool according to claim 1 , wherein
the positioning member is fixed to a tool post on which a cutting-off tool for cutting off the rod material is mounted.

3 . The machine tool according to claim 1 , wherein
the path is a concave portion provided in a contact surface that a leading end surface of the rod material contacts.

4 . The machine tool according to claim 3 , wherein
a center of the concave portion is aligned with a center of the leading end surface when the leading end surface contacts the contact surface.

5 . The machine tool according to claim 2 , wherein the path is a concave portion provided in a contact surface that a leading end surface of the rod material contacts.

Assignees

• Citizen Watch Co Ltd
• Citizen Machinery Co Ltd

Inventors

• Maehara Tomonori

Classifications

• B23B11/00

  Automatic or semi-automatic turning-machines incorporating equipment for performing other working procedures, e.g. slotting, milling, rolling {(B23B3/065 and B23B3/16 take precedence; machines incorporating a plurality of sub- assemblies, each capable of performing a metal-working operation, the sub-assemblies being arranged to operate simultaneously at different stations B23Q39/04)} · CPC title

• B23B7/06

  with sliding headstock · CPC title

• B23Q17/0909 Primary

  Detection of broken tools · CPC title

• Y10T82/2543

  Multiple tool support · CPC title

• Y10T29/5168

  Multiple-tool holder · CPC title