To shorten the time of the ejection operation while keeping the accuracy of the backward movement limit position (return position) of an ejection member.

A rate characteristic curve for reducing the rate in a terminal area in the process of moving forward an ejection member to the forward movement limit position and a rate characteristic curve for accelerating the rate in an initial area in the process of moving backward the ejection member from the forward movement limit position are so controlled as to be more sharp and steep compared with a rate characteristic curve for reducing the rate in the terminal area in the process of moving backward the ejection member to the backward movement limit position simultaneously. Also the driving of the ejection member is controlled by a rate instruction pattern for not stopping the ejection member on the forward movement limit position.