mounted thereon is arranged to be engaged with the gear wheel 11 and further to be engaged with a gear wheel 42 mounted on a shaft 43 positioned opposedly adjacent to the shaft 40 the gear shaft 42 is further arranged to be engageable with a gear wheel 45 mounted on a shaft 44 aligned opposedly to the shaft 43 the gear wheel 45 is then arranged in such a manner that it is engageable with the wheel 21 thereby allowing the rotating force of the gear wheel 11 to be deceleratingly transmitted to the wheel 21 to an appropriate extent the number of wheels and gear numbers on the wheels may not be restricted to particular ones and any modifications may be chosen as long as the rotating force of a motor is decelerated to an appropriate degree alternatively a timing belt engageable with a gear pulley also may be utilized in place of the gear wheels 41 42 and 45 the position detecting member 22 includes a lift portion 23 mounted integrally on the upper surface thereof and in a radial direction the lift portion 23 performs a function for lifting and transporting a pickup 58 to its original position as will be described in detail hereinbelow the member 22 also has its peripheral circumference two.