Magnetic recording/reproduction apparatus having a mechanism for moving a sub-chassis relative to a main chassis

A magnetic recording/reproduction apparatus for recording/reproduction information on/from a magnetic tape by drawing out the magnetic tape from a tape cassette and allowing the magnetic tape to pass around a rotary head cylinder, having a rotary head, for a predetermined arc, the apparatus comprising:

• a first chassis into which the tape cassette is inserted;
• and
• a second chassis having the rotary head cylinder mounted thereon and guiding movements of the first chassis toward and away from the rotary head cylinder,
• wherein the magnetic recording/reproduction apparatus includes:
• a first state in which the tape cassette is inserted into the first chassis by a user;
• and
• a second state in which a tape running path enabling recording/reproduction of the magnetic tape is established in such a manner that, as the first chassis moves toward the rotary head cylinder after insertion of the tape cassette, tape guide members draw out the magnetic tape from the tape cassette and allow the magnetic tape to pass around the rotary head cylinder for a predetermined arc,
• wherein the magnetic recording/reproduction apparatus further comprises:
• a tape guide member carrier carrying the tape guide members;
• a carrier driving member for driving the tape guide member carrier so that the carrier driving member is movable from the first state to the second state and from the second state to the first state;
• a first chassis driving arm swingably mounted on the second chassis for driving the first chassis;
• a loading driving arm swingably mounted on the second chassis for driving the carrier driving member;
• and
• a rotator mounted on the second chassis for driving the first chassis driving arm and the loading driving arm,
• the rotator including a protrusion for driving the first chassis driving arm and the loading driving arm,
• the first chassis driving arm including a first cam portion which engages with the protrusion,
• the loading driving arm including a second cam portion which engages with the protrusion,
• the first cam portion having a first arc portion, a second arc portion, and a first concave portion formed between the first arc portion and the second arc portion,
• the second cam portion having a third arc portion, a fourth arc portion, and a second concave portion formed between the third arc portion and the fourth arc portion.