Dynamic magnetic information storage or retrieval – Record transport with head moving during transducing – Tape record
Reexamination Certificate
1999-03-15
2001-08-14
Evans, Jefferson (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head moving during transducing
Tape record
C360S093000
Reexamination Certificate
active
06275351
ABSTRACT:
BACKGROUND OF THE INVENTION
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
39
, a conventional magnetic recording/reproduction apparatus
300
will be described.
Referring to
FIG. 38
, the reference numeral
301
denotes a slide chassis into which a cassette is inserted, and the reference numeral
351
denotes a main chassis. Loading lever pins
311
A and
311
B extend from the main chassis
351
. Loading arms
303
A and
303
B are swingably mounted on the slide chassis
301
via a shaft. First guide bases
313
A and
313
B and second guide bases
315
A and
315
B are provided with respective tape drawing posts for drawing a tape from the cassette and allowing the tape to pass around a rotary head cylinder. The first guide bases
313
A and
313
B and the second guide bases
315
A and
315
B are driven by the loading arms
303
A and
303
B, respectively, to move between respective positions in a cassette mouth
322
and respective loading completion positions so as to draw out the tape from the cassette and allow the tape to pass around the rotary head cylinder.
The operation of the above components will be described.
Referring to
FIG. 38
, after the insertion of the cassette, the slide chassis
301
starts moving in the direction indicated by arrow B
3
to reach the position shown in FIG.
39
. During this movement, the loading arms
303
A and
303
B have not yet begun to swing.
In the above state, the loading lever pins
311
A and
311
B (
FIG. 39
) on the main chassis
351
engage with hook portions
309
A and
309
B of the loading arms
303
A and
303
B, respectively, which move in synchronization with the movement of the slide chassis
301
. As the slide chassis
301
moves further in the direction B
3
, the loading arms
303
A and
303
B are driven by the loading lever pins
311
A and
311
B to begin swinging in the directions indicated by arrows J and K, respectively. By this swinging of the loading arms
303
A and
303
B, the first guide bases
313
A and
313
B and the second guide bases
315
A and
315
B start moving in the direction B
3
, and reach to the respective loading completion positions as the slide chassis
301
moves in the direction B
3
, thereby allowing the tape to pass around the rotary head cylinder for a predetermined arc.
The conventional apparatus with the above construction has at least the following design problem.
As described above, the loading arms
303
A and
303
B are constructed to be driven by and moved in synchronization with the movement of the slide chassis
301
. Therefore, the respective components cannot be moved independently.
For example, it is impossible to construct the apparatus
300
so that the swinging of the loading arms
303
A and
303
B is started before the start of the movement of the slide chassis
301
to enable the guide bases
313
A,
313
B,
315
A, and
315
B to protrude from the cassette mouth
322
so that the guide bases
313
A,
313
B,
315
A, and
315
B can pass through a space between the rotary head cylinder and the cassette during the time when the space is sufficiently large before it is reduced by the movement of the slide chassis
301
in the direction B
3
. Accordingly, in the above construction, it is necessary that the cassette starts moving from a position sufficiently away from the rotary head cylinder so that the space between the rotary head cylinder and the cassette is guaranteed as sufficient when the guide bases
313
A,
313
B,
315
A, and
315
B pass through the space. This requires the slide chassis
301
to undergo a large amount of the movement.
The above construction greatly restricts the design of the mechanism. For example, guide grooves
343
A,
343
B,
343
C,
343
D formed on the slide chassis
301
(
FIG. 36
) need to be made long, which decreases the strength of the slide chassis
301
. Also, the amount of movement of a slide chassis driving lever
359
(
FIG. 37
) for driving the slide chassis
301
becomes large. This in turn increases the lift amount of a cam groove
357
formed on a main cam
353
for driving the slide chassis driving lever
359
. As a result, the diameter of the main cam
353
increases, and thus realization of a small-sized mechanism is not possible. Apart from the above construction, if the guide bases
313
A,
313
B,
315
A, and
315
B are to be driven by separate driving means without synchronization with the slide chassis
301
, two separate driving means are required, which also frustrates the 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.
SUMMARY OF THE INVENTION
The magnetic recording/reproduction apparatus of this invention includes: a first arm swingably mounted on a chassis; a second arm swingably mounted on the chassis; and a rotator mounted on the chassis, the rotator including a protrusion for driving the first arm and the second arm, the first arm including a first cam portion which engages with the protrusion, the second 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.
In one embodiment of the invention, the rotator includes a gear.
In another embodiment of the invention, the magnetic recording/reproduction apparatus further includes a reversible motor for driving the rotator.
In still another embodiment of the invention, the magnetic recording/reproduction apparatus records/reproduces 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 magnetic recording/reproduction apparatus includes: a first state in which the tape cassette is inserted into the 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 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, and wherein the first arm abuts the second arm so that in the second state the second arm is prevented from swinging in an unloading direction in which the second state is shifted to the first state.
In still another embodiment of the invention, the magnetic recording/reproduction apparatus records/reproduces 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 magnetic recording/reproduction apparatus includes: a first state in which the tape cassette is inserted into the 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 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, and wherein the first arm and the second arm are disposed in a space between the rotator and the chassis.
Alternative
Hirabayashi Koichiro
Konishi Akio
Terao Tatsuo
Yanagihara Takefumi
Evans Jefferson
Matsushita Electric - Industrial Co., Ltd.
Renner , Otto, Boisselle & Sklar, LLP
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