and reproducing heads a pinch roller 17 and an impedance roller 18 a first link 22 is angularly movably supported on a shaft 21 by which the third chassis 4 is pivotally coupled to the first chassis 2 the first link 22 has an end fixed to the side wall panel 4b of the third chassis 4 by a pin 23 so that the first link 22 is angularly movable in unison with the third chassis 4 the opposite end of the first link 22 supports an engaging pin 24 a second link 25 is pivotally supported at its central portion on one of the pivoted ends of the cassette presser frame 5 by a shaft 26 the second link 25 has a groove 27 defined in a portion thereof on one side of the shaft 26 and the engaging pin 24 is movably received in the groove 27 the second link 25 supports a presser pin 28 on an end thereof on the other side of the shaft 26 remote from the groove 27 the groove 27 includes a relief portion 27a in which the engaging pin 24 slides as the first link 22 turns in unison with the third chassis 4 when the third chassis 4 is angularly moved away from the first chassis 2 thereby opening the first chassis 2 a disengaging.