To prevent a repulsive force by the press-contacting of a pair of tape guide bases from being applied on a power transmitting means after the completion of loading.

This device is provided with a toggle means T linked with a pair of loading gears 5 and 6, a rotation from a loading motor is transmitted through a control cam gear 2 and a timing gear 3 to the pair of loading gears 5 and 6. The toggle means T is provided with a spring lever 12 rotated coaxially to the S loading gear 5, a shift arm 13 rotated coaxially to the T loading gear 6, a planetary gear 14 rotatably supported by the shift arm 13 and engaged with the pair of loading gears 5 and 6, a joint plate 15 connecting the planetary gear 14 and the spring lever 12 with each other, and a first tensile coil spring 16 for applying a pressing force on the spring lever 12 so that this pressing force provides a rotating force through the joint plate 15 to the planetary gear 14.