Conveyance system

A conveyance system extracting an object to be conveyed held by a holding device from the holding device and conveying the object to a machine tool, the conveyance system comprising:

• a conveyance device having a moving platform and configured to move the moving platform to a working position set for the holding device and to a working position set for the machine tool;
• a transfer device and a robot arranged on the moving platform;
• and
• a controller configured to control operations of the moving platform, transfer device, and robot, wherein:
• the transfer device has:
• an engagement member arranged to be engageable with the object;
• and an advancing and retracting mechanism configured to advance and retract the engagement member in a predetermined direction in a horizontal plane;
• and
• the controller is at least configured to sequentially execute a first moving operation of moving the moving platform of the conveyance device to the working position set for the holding device, an engaging operation of engaging the engagement member with the object as a target by causing the advancing and retracting mechanism to advance the engagement member, and an extracting operation of extracting the object from the holding device by causing the advancing and retracting mechanism to retract the engagement member, and thereafter sequentially execute a second moving operation of moving the moving platform to the working position set for the machine tool, a loading operation of loading the conveyed object into the machine tool by causing the advancing and retracting mechanism to advance the engagement member, and a retracting operation of causing the advancing and retracting mechanism to retract the engagement member;
• wherein the transfer device is configured to be capable of transporting to the machine tool a first workpiece having a different weight or shape from a second workpiece that the robot can transport to the machine tool.