Title:
MACHINE TOOL
Document Type and Number:
Japanese Patent JP2017209776
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To make it possible to easily detect poor holding of a main shaft without provision of any special sensor and so on.SOLUTION: A machine tool (1) in which two main shafts (2, 3), which comprise opening/closing possible chucks (9, 11) and are relatively movable, are so provided as to be capable of freely hanged between a free rotation state and a rotation drive state, and rotation detection means (7, 8) which detect rotation of the main shafts (2, 3) and gripping change means which changes a gripping position of a bar stock (33) by the main shafts (2, 3) by closing the chuck at a prescribed movement position are provided, and which performs processing of the bar stock (33) while sequentially delivering the bar stock. In the machine tool, gripping failure detection means, which changes the main shaft (2) of which a gripping position is changed by the gripping change means into the free rotation state, rotationally drives the other main shaft (3), and detects gripping failure of the main shafts (2, 3) when changing the gripping position on the basis of a rotation state of the main shaft (2) in the free rotation state detected by the rotation detection means (7, 8), is provided.SELECTED DRAWING: Figure 7
Inventors:
IKEDA NAOKI
KINO MASANOBU
KINO MASANOBU
Application Number:
JP2016106681A
Publication Date:
November 30, 2017
Filing Date:
May 27, 2016
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
CITIZEN MACHINERY CO LTD
CITIZEN MACHINERY CO LTD
International Classes:
B23B3/30; B23B31/20; B23Q17/00
Domestic Patent References:
| JP2013123774A | 2013-06-24 | |||
| JP2008006543A | 2008-01-17 | |||
| JPH0775901A | 1995-03-20 |
Attorney, Agent or Firm:
Towa Nagisa International Patent Office
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