The present invention relates to a shifting mechanism of a drum reel comprising a toothed disc shaft, a first sprocket having a first perforation for the sprocket shaft to pass through, a second sprocket parallel to the first sprocket and having a first The second through hole is provided for the gear shaft to pass through, a shift lever, a pin member, and a first elastic member are disposed on the shift lever, wherein the toothed disc shaft has a shaft hole and two slots, and the shift lever extends into the shaft hole of the toothed shaft The shifting lever is provided with two long holes and can be axially displaced with respect to the shaft of the toothed disc. The pin member passes through the slot and the long hole, and the first elastic member abuts against the pin member. When the pin member protrudes into the first through hole, the first A toothed disc is driven by the chainring shaft, and when the pin member projects into the second perforation, the second chainring is driven by the chainring shaft. Thereby, the shifting mechanism of the drum reel can make the pin positioning accurate, the shifting operation smooth, and the assembly is easy and the product stability can be improved.本創作係一種鼓式捲線器之變速機構，包含有一齒盤軸、一第一齒盤具有一第一穿孔供齒盤軸穿過、一第二齒盤與第一齒盤並排且具有一第二穿孔供齒盤軸穿過、一變速桿、一銷件、以及一第一彈性件設於變速桿，其中齒盤軸具有軸孔以及二槽孔，變速桿伸入齒盤軸之軸孔，變速桿設有二長孔並可相對於齒盤軸軸向位移，銷件穿過槽孔與長孔，第一彈性件貼抵於銷件，當銷件伸入第一穿孔時，第一齒盤受齒盤軸驅轉，當銷件伸入第二穿孔時，第二齒盤受該齒盤軸驅轉。藉此，該鼓式捲線器之變速機構可使銷件定位確實、變速動作順暢，且其組裝容易並可提高產品穩定性。
