Machine tool

Patent metadata

Field	Value
Publication number	US-11919093-B2
Application number	US-201917277847-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Oct 10, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A machine tool includes a plurality of modules, and a control means for controlling operation of the modules, wherein the plurality of modules include a fixed module and two movable modules. The control means includes a restriction means for restricting the movement of the two movable modules for allowing only one of the movable modules to be moved to a facing position facing the fixed module; and a determination means for determining the movable module to be moved to the facing position. The control means is configured to control the operation of the plurality of modules so that, when the operation under cooperation of the fixed module and one of the movable modules has been completed, the restriction means releases the restriction of the movement of the other movable module to the facing position.

First claim

The invention claimed is:

1. A machined tool comprising:
a plurality of modules, having a workpiece holder means for holding a workpiece, for performing a predetermined processing on the workpiece; and
a control unit for controlling the predetermined processing of the plurality of the modules, wherein
the predetermined processing includes receiving the workpiece, holding the workpiece on the workpiece holder means, processing the workpiece by a tool of a tool stand, and transferring the workpiece to a next process step,
the plurality of the modules comprises:
a first module that is movable in a first direction and is immovable in a second direction orthogonal to the first direction; and
two second modules that are movable in the first direction and the second direction and are located at a same side opposite to the fixed module in the first direction, wherein the two second modules have a respective longitudinal axis, the longitudinal axes of the two second modules being parallel to each other along the first direction,

the control unit is configured to determine, based on the predetermined processing, one of the two second modules to be moved to a facing position where the one of the two second modules faces the first module in the first direction, allow only the one of the two second modules to be moved to the facing position the fixed module, by restricting, and restrict a movement of the other one of the two second modules, and
the control unit is further configured to control movements of the plurality of the modules so that, when each of the two second modules receives a movement command from the control unit for moving to the facing position and the predetermined processing under cooperation of the first module and the one of the two second modules has been completed, restriction of the movement of the other one of the two second modules to the facing position is released.

2. The machine tool according to claim 1 , wherein the control unit is further configured to determine the one of the two second modules according to an execution order of a plurality of operation commands for the predetermined processing performed under the cooperation of the first module and the two second modules, as prescribed in a machining program.

3. The machine tool according to claim 1 , wherein
the one of the two second modules is configured to transfer the workpiece to the next process step and the other one of the two second modules is configured to transfer the workpiece to the first module, and
the control unit is further configured to determine the one of the two second modules so that:
when the workpiece holder means of the first module is holding the workpiece, priority is given to a movement of the one of the two second modules; and
when the workpiece holder means of the first module is not holding the workpiece, priority is given to a movement of the other one of the two second modules.

Assignees

• Citizen Watch Co Ltd
• Citizen Machinery Co Ltd

Inventors

• Watabe Shuichi

Classifications

• B23B3/30 Primary

  Turning-machines with two or more working-spindles, e.g. in fixed arrangement · CPC title

• B23B7/06

  with sliding headstock · CPC title

• B23Q41/02

  Features relating to transfer of work between machines (arrangements for handling work for machine tools coordinated in production lines B23Q7/14) · CPC title

• B23Q41/04 Primary

  Features relating to relative arrangements of machines · CPC title

• B23Q39/04

  the sub-assemblies being arranged to operate simultaneously at different stations, e.g. with an annular work-table moved in steps (associations of machines connected only by work-transferring means B23Q41/00) · CPC title