Forma, Vol. 31 (No. 1), pp. 15, 2016

Analysis of the Motion of the Pop-up Spinner

Hiromi Ei1, Hiroko Hayashi2 and Kazushi Komatsu2*

1Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
2Department of Mathematics, Kochi University, 2-5-1 Akebono-cho, Kochi, Kochi 780-8520, Japan
*E-mail address:

(Received April 14, 2015; Accepted March 29, 2016)

Abstract. The pop-up spinner is a pop-up card. As the completed card opens and closes, its nested frames spin. We analyze the motion of frames of the pop-up spinner, and represent by a nested epitrochoid mechanism.

Keywords: Pop-up spinner, Epitrochoid

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