| 摘要 |
<p>A ball launching machine includes a ball stocker (101) for stocking the balls to be pitched, a ball transfer tube (102) for the balls to be transferred from the ball stocker (101) to the ball supporting structure, a pitching arm (103) for providing the arm-motion of a bowler, a motor drive (104) for rotating the pitching arm (103), a vibration absorber (105) for absorbing the vibrations of the machine thus providing stability, a vertical axis adjustment dial (106) for adjusting the length of the pitched ball, an operation switch (107) for operating the machine, a horizontal-axis adjustment dial (108) for controlling the traverse direction of the ball and controlling the motion direction of the pitching arm (103), a height adjustment mechanism (109) wherein height of the machine can be adjusted to imitate the height of a bowler and plurality of wheels particularly tyres (110) to move the machine easily.</p> |
