| 摘要 |
PURPOSE: A multi automatic vending machine is provided to detect the protrusion of shelves by transmitting and receiving an optical signal through through-holes which are formed in each shelf. CONSTITUTION: Optical sensor modules(230) are formed on the upper side and the bottom side of the inside of a product display case. Optical signals are transmitted and received between both optical sensor modules. The optical signal of the optical sensor modules passes through through-holes on one side of a shelf(210). A front guide(214) is formed on the front side of the shelf and is upwardly and downwardly moved. |
