Abstract: A pair of front rotary wheels are disposed so that they hold therebetween a frame extending in the direction in which a ball is thrown. A pair of rear rotary wheels are disposed rearwardly of the front rotary wheels and with the frame held therebetween. These front and rear rotary wheels are operatively connected together by operatively connecting devices. When a ball is fed in from the rear end of the frame, it is nipped between the outer peripheral surfaces of the pair of rear rotary wheels and thrown forward and then it is nipped between the outer peripheral surfaces of the front rotary wheels and thrown forward. An annular bracket is fitted on the frame in its intermediate portion between the front and rear rotary wheels and is attached to the frame. The annular bracket are pivotally supported at its right and left outer sides on the support block, and the operatively connecting devices are disposed within the annular bracket.

Abstract: A ball throwing machine comprising a first pair of counter-rotating wheels whose axes are parallel to each other, and a pair of second counter-rotating wheels which are disposed forwardly adjacent the first rotary wheels and whose axes are parallel to each other and substantially at right angles as seen in front view to the axes of the first rotary wheels. A ball is nipped between the outer peripheral surfaces of the first rotary wheels and accelerated, whereby the ball is propelled forward. Then, this propelled ball is nipped between the outer peripheral surfaces of the second rotary wheels and further accelerated and thereby thrown forward.

Abstract: A pair of rotary wheels, a counter-rotating mechanism for rotating these rotary wheels in opposite directions, and a drive source for driving the rotary wheels through the counter-rotating mechanism are provided. A ball is nipped between the outer peripheral surfaces of the rotary wheels and is thereby thrown. The drive source is in the form of an engine having an output pulley, while the counter-rotating mechanism has an input pulley. A transmission belt is entrained around these pulleys.

Abstract: A ball throwing machine body having a pair of rotatable bodies adapted to nip a ball therebetween to throw it and a support member of ball joint type for supporting the ball throwing machine body on a pillar member. The support member enables the ball throwing machine body to be turned around an axis extending in the ball throwing direction and to be fixed at a desired position.