Patent ID: 9737822
Date: 2017-08-22
CPC Classifications: A63H

Claim:
1. A spin speed measuring device for a launcher to spin a spinning toy, the spin speed measuring device comprising: a casing; a spinning body pivotally supported in the casing to spin the spinning toy; a pinion gear configured to spin together with the spinning body; a belt having a rack and a plurality of indicators provided with a predetermined distance from each other, the rack being configured to mesh with the pinion gear; a detector attached to the casing to detect the indicator passing by, and a calculator which has information of the predetermined distance between the indicators and disposed inside or outside the casing wherein the calculator calculates a spin speed of the spinning body from the predetermined distance and a time period from when one of the indicators passes by to when another one of the indicators passes by, the time period being obtained using signals output from the detector and wherein the indicator is a protrusion or a notch provided on the belt, and the detector is a contact switch activated by the protrusion or the notch.