Automatic liquid soap dispenser

An automatic liquid soap dispenser, comprising:

• a liquid soap container which confines a hollow space for receiving liquid soap therein, said soap container having a bottom wall which is formed with an outlet port and which has a bottom surface;
• a flow control unit including:
• a tubular body with an open front portion and a closed rear portion which is formed with adjacent first and second annular outward projections that respectively confine a through-hole communicated with an interior of said tubular body, said tubular body being secured to said bottom surface of said bottom wall of said liquid soap container such that said through-hole of said first annular outward projection is aligned with said outlet port, said closed rear portion of said tubular body being further formed with an upright soap outlet disposed adjacent to and communicated with said through-hole of said second annular outward projection, said second annular outward projection having a lower end which is formed with a valve seat, and a first ball member disposed movably within said second annular outward projection on said valve seat, said second annular outward projection and said first ball member serving as a ball valve unit to control flow of said liquid soap through said soap outlet;
• and a plunger having a piston which extends fittingly and movably into said tubular body via said open front portion, and a flexible shaft portion which has a first end connected to said piston and a second end;
• and
• an actuating unit mounted on said liquid soap container and including:
• an infrared unit for detecting a target;
• a driving unit connected to said infrared unit and activated by said infrared unit upon detection of said target;
• a speed changing gear set driven rotatably by said driving unit;
• a driving gear driven rotatably by said speed changing gear set, said second end of said shaft portion of said plunger being connected eccentrically to said driving gear, rotation of said driving gear resulting in linear movement of said piston of said plunger within said tubular body to open said ball valve unit and dispense a predetermined amount of said liquid soap through said soap outlet;
• and a contact switch disposed on one side of said driving gear and activated by said driving gear when said driving gear completes one revolution, said contact switch being connected to said driving unit and deactivating said driving unit when activated.