Article transfer apparatus and article transfer method

An article transfer apparatus at which an OHT transfers a container, the article transfer apparatus comprising:

• a top support unit fixed to a top space within a semiconductor fab and at which an open region is formed;
• a bottom support unit positioned spaced apart below the top support unit and including a plurality of mounting regions on which the container is mounted;
• a fixing member coupled between the top support unit and the semiconductor fab;
• a link unit coupled between the top support unit and the bottom support unit, which can be folded, and which is configured in a plurality to be spaced apart from each other;
• a folding driving unit positioned at the open region, connecting the top support unit and the link unit, configured so when not driven a space that the container can be mounted on is formed by the link unit being spread, and when driven the bottom support unit closely contacts the top support unit by folding the link unit, and the folding driving unit is positioned to not go beyond a top portion of the support unit;
• a buffer identification sensor formed as an RFID tag and including a buffer information, coupled to the top support unit, and which transmits the buffer information to the OHT by communicating with the OHT;
• a load detection sensor installed at each mounting region of the bottom support unit, and which generates a load signal when mounted on the container;
• a control system which controls the OHT to transfer the OHT positioned in a loaded state according to a transfer scheduling of the container, or to load the container to a region which is not loaded, and the control system is input with the load signal in communication with the load identification sensor, the load identification sensor generates a load/unload information for each region at which the load identification sensor is installed, sets the load/unload information as a load state with respect to a region at which the load sensor is generated, and which sets the load/unload information as an unload state with respect to a region at which the load signal is not generated, and activates the folding driving unit to a drivable state if the loading signal does not occur at an entirety of the load detection sensors, and deactivates the folding driving unit so it cannot drive if at least one load signal occurs among the load detection sensors;
• a buffer control unit including an antenna unit installed at the bottom support unit and a buffer communication unit electrically connected to the antenna unit and which communicates with the control system, and transmits the container information to the control system when the container is loaded, and which is configured to be input with a container information of the container by communicating with the container when the container is mounted on the mounting region, and which transmits the container information which is input to the control system;
• and
• a reflective plate which couples with the bottom support unit and which reflects a light, and
• wherein the link unit includes:
• a first link unit connected to the top support unit and the bottom support unit;
• a second link unit connected to the top support unit and the bottom support unit, positioned spaced apart from the first link unit, and folding in a direction facing the first link unit;
• a third link unit connected to the top support unit and the bottom support unit, positioned spaced apart from the first link unit, and folding in a same direction as the first link unit;
• and
• a fourth link unit connected to the top support unit and the bottom support unit, positioned facing the third link unit, and folding in a same direction as the second link unit;
• a first link shaft connecting points at which the first link unit and the third link unit pin couple to;
• a second link shaft connecting points at which the second link unit and the fourth link unit pin couple to;
• a first folding shaft connected between the first link unit and the third link unit, and which couples to the folding driving unit;
• a second folding shaft connected between the second link unit and the fourth link unit, and which couples to the folding driving unit, and
• wherein each of the plurality of link units include:
• a first support bar having an end rotatably coupled to the top support unit;
• and
• a second support bar having an end coupled to the other end of the first support bar and having the other end rotatably coupled to the bottom support unit, and
• wherein the folding driving unit includes:
• a first rod having an end coupled to a folding shaft of the link unit;
• a driving actuator having an end coupled to the other end of the first rod and a body coupled to the top support unit, and when forwardly driven forwardly drives the first rod and when backwardly driven backwardly drives the first rod;
• and
• a manual operation unit which couples to a side of the top support unit, connects to a driving shaft of the folding driving unit, and by rotating in a direction the folding driving unit is driven to fold the link unit, and by rotating in another direction the folding driving unit is driven to open the link unit.