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, said bottom wall having a bottom surface;
• a flow control unit including
• a tubular body having 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 movable blocking member disposed movably within said second annular outward projection and movable between a first position, wherein said blocking member rests on said valve seat so as to block said through-hole of said second annular outward projection, and a second position, wherein said blocking member moves away from said valve seat so as to unblock said through-hole of said second annular outward projection, thereby controlling 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
• means for detecting a target;
• a driving unit connected to said detecting means and activated by said detecting means upon detection of said target;
• said second end of said shaft portion of said plunger being coupled eccentrically to said driving unit so that activation of said driving unit results in reciprocal linear movement said piston of said plunger within said tubular body, thereby moving said blocking member from said first position to said second position and dispensing a predetermined amount of said liquid soap through said soap outlet;
• and
• switch means, connected to said driving unit, for deactivating said driving unit when said piston of said plunger completes one cycle of said reciprocal linear movement.