external output shaft extending outside from the casing of the device transmission consists of a driving wheel fixed to an extension of a center shaft and a follower wheel fixed to the output shaft which is disposed parallel to the center shaft the driving wheel and the follower wheel are arranged to either mesh or not mesh with each other depending on their relative relationship in the axial direction by caused axial shifting of the center shaft virtue of the construction as mentioned above the device can drive by relying on the driving motor alone another device or attachment subsequent to or concurrent with sound reproduction application_number US 53686783 A description referring now to the drawings and in particular to fig1 a wherein there is illustrated one example of the present invention in the form of a casing 1 which consists of a chassis 1a and a housing 1b coupled thereon in the chassis 1a of the casing 1 a space 18 is defined by a bottom plate 16 and a middle plate 17 underneath the bottom plate 16 a transmission case 19 is formed by being attached to the adjacent face of the bottom plate 16 within the space 18 a record disc 3 formed integral with a center shaft 2 is mounted in the space 18 the center shaft 2 is journally received by the bottom plate 16 and the middle plate 17 this record disc 3 can be made either integral with a turntable 3d or separate therefrom as an exchangeable type in the example as shown the turntable 3d is provided with a pulley groove for power transmission around its outer periphery and is made integral with the record disc 3 which.