The pushers 103 to 106 are altered sequentially in the operation in such a manner that, when the shoes 101 are in such a state as shown in the figure (that is, the aforesaid space 102 is located just before the pusher 103), the pusher 104 is operated to push out the shoe 101 located just before it, and then the pusher 105 and subsequently the pushers 106 and 103 are operated.