Table tennis ball service machine

Abstract

A table tennis ball service machine includes a ball-collecting unit, a control valve and a ball service mechanism. The ball-collecting unit has a ball-collecting groove connected with ping pong table and having its rear side provided with a blocking net and its lower side connected with a ball-collecting tube and a ball-feeding tube. The control valve is positioned at the lower end of the ball-collecting tube for controlling dropping of balls. The ball service mechanism connected with the upper side of the ball-feeding tube includes a ball service tube, a blower, a support frame, a universal joint, a cam and a motor. The ball serving tube has its outer end extending through the blocking net and formed with an outlet and its rear side formed with an inlet communicating with the ball-feeding tube. Thus, the ball serving speed and the angle can be controlled.

1 . A table tennis ball service machine comprising: 
 a ball-collecting unit provided with a ball-collecting groove, said ball-collecting groove connected with one end of a ping pong table, said ball-collecting groove having its rear side provided with a blocking net, said ball-collecting groove having its lower side connected with a ball-collecting tube, said ball-collecting tube having its lower end connected with a ball-feeding tube, said ball-feeding tube having its starting end formed with a suction opening;    a control valve assembled at the lower end of said ball-collecting tube, said control valve provided with a telescopic rod, said telescopic rod having one end pivotally connected with a control member, said control member pivotally combined with a positioning base by a pivot, said control member having the other end hooked with a spring, said spring having the other end hooked with said positioning base;    a ball service mechanism assembled at the upper end of said ball-feeding tube, said ball service mechanism composed of a ball serving tube, a blower, a support frame, a universal joint, a cam and a motor; said ball serving tube having its outer end extending through said blocking net and formed with an outlet, said ball serving tube having its rear end formed with an inlet communicating with said ball-feeding tube; and    said control member of said control valve controlling blocking or delivering of the table tennis balls in said ball-collecting tube, said control member also able to control the ball serving speed, said ball-service mechanism able to control the ball serving angle.    
   
   
       2 . The table tennis ball service machine as claimed in  claim 1 , wherein said ball-collecting groove has one side installed with a stirrer provided with speed-reducing motor having a rotating shaft extending outward horizontally from its front side, said rotating shaft of said speed-reducing motor connected with a stirring rod extending downward into said ball-collecting groove.  
   
   
       3 . The table tennis ball service machine as claimed in  claim 1 , wherein said ball serving tube of said ball service mechanism is provided with a fitting end on said inlet, said fitting end fitted with said blower, said blower having its lower side assembled with said support frame, said support frame having its lower side connected with said universal joint, said universal joint connected with said cam, said cam connected with said motor.