Method and apparatus of replenishment in assembly line

A replenishment apparatus, for an assembly line, defined with a usage storage area and a spare storage area, comprising:

• a fixing carrier, disposed in the usage storage area, configured to store a first object set capable of storing a plurality of objects;
• a counter, configured to calculate a remaining number of the objects in the first object set of the usage storage area;
• a moving carrier, disposed in the spare storage area, configured to store a second object set capable of storing a plurality of objects, and to move the second object set from the spare storage area to the fixing carrier of the usage storage area;
• and
• a controller, configured to execute the following steps:
• determining whether a remaining number of the object in the first object set carried in the fixing carrier is zero;
• determining whether the first object set carried in the fixing carrier has been removed;
• driving the moving carrier to move the second object set in the spare usage area to the fixing carrier in the usage storage area in response to the determination that the remaining number of objects in the first object set carried in the fixing carrier is zero and the first object set in the fixing carrier is removed;
• and
• moving the moving carrier to leave the fixing carrier to return to the spare usage area.