1. Field of the Invention
The present invention relates to a magnetic recording/reproduction apparatus, and more particularly, relates to a magnetic recording/reproduction apparatus provided with a mechanism for moving a sub-chassis relative to a main chassis.
2. Description of the Related Art
An example of conventional magnetic recording/reproduction apparatus is disclosed in Japanese Patent Gazette No. 2627465. Referring to FIGS. 36 to 38, a conventional magnetic recording/reproduction apparatus 300 will be described.
FIG. 36 is a plan view of a slide chassis 301. A spring hook 341 having a groove 356 is mounted on the slide chassis 301.
FIG. 37 is a plan view of a main chassis 351. A slide chassis driving lever 359 is swingably mounted on the main chassis 351 via a swing shaft 361. A cam pin 363 extends from the slide chassis driving lever 359 and engages with a slide chassis driving groove 357 of the main cam 353.
Referring to FIG. 38, the spring hook 341 has two holes 341A and 341B for fastening the spring hook 341 to the slide chassis 301. The holes 341A and 341B are elongate in the direction of sliding of the slide chassis 301 (direction indicated by arrow B3). Using these elongate holes 341A and 341B, the position of the spring hook 341 can be adjusted in the direction B3 so that the position of the slide chassis 301 and the position of a slide chassis driving pin 365 of the slide chassis driving lever 359 correspond to each other in the loading state. After the adjustment, the spring hook 341 is fastened to the slide chassis 301 with screws or the like. Such a construction is normal for a conventional magnetic recording/reproduction apparatus having a slide chassis.
The driving mechanism for the slide chassis 301 as described above has at least the following problems.
In the above mechanism, the position of the slide chassis 301 at the completion of the loading operation is adjusted by moving the slide chassis 301 in the direction B3 as described above. The spring hook 341 is fastened to the slide chassis 301 via the holes elongate in the direction B3. Accordingly, if an abnormal load is applied to the spring hook 341 in a direction blocking the loading/unloading operations during the loading/unloading operations, the spring hook 341 may move in the direction B3 against the fastening force, resulting in a change in the position of the slide chassis 301 with respect to the main chassis 351. Such an application of an abnormal load is likely to occur since the slide chassis is the portion of the magnetic recording/reproduction apparatus which is exposed to direct contact with a user.
Moreover, a reel base for driving a tape reel in a cassette is located at a position in the direction B3 from the spring hook 341. Accordingly, an attempt to secure a moving space for the spring hook 341 will block realization of a small-sized mechanism.
The object of the present invention is to provide a magnetic recording/reproduction apparatus provided with a small-sized mechanism capable of achieving high reliability.