Magnetic recording and reproducing device having a driving roller rotated by a motor of low torque which is press contracted with a transfer roller of a cartridge and transfers a magnetic tape

A magnetic recording and reproducing device in which a cartridge storing a magnetic tape therein and having a transfer roller for transferring said magnetic tape is engaged and a driving roller is press contacted with said transfer roller to rotationally drive said transfer roller, wherein there is provided a slide member engaged with said cartridge to cause it to be slidingly moved, said cartridge being slidingly moved toward said driving roller while said cartridge is being engaged with said slide member so as to press contact said transfer roller and said driving roller with each other and then said driving roller and said transfer roller are spaced apart or a press contacting force between both said rollers is weakened, said driving roller is rotated by a predetermined number of rotations and afterwards both rollers again approach to increase the press contact force between said rollers and said transfer roller is rotated through rotation of said driving roller.