JPH054116Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" In this invention, when a tape cassette is inserted into the cassette holder, the holder automatically moves from the reset position to the set position to perform playback operation.
This invention relates to a cassette holding mechanism in a cassette type tape recorder in which when a cassette holder is moved from a set position to a reset position, it is automatically stopped and the tape cassette is pushed back in the unloading direction.

``Prior Art'' The overall mechanical structure of this type of cassette tape recorder is explained below with reference to FIGS. 3 to 7.

That is, FIG. 3 is a plan view showing the mechanical part of the cassette tape recorder taken out, and FIG. ing. Although the cassette holder 3 is always biased toward the chassis 1, it is locked in an upper position away from the chassis 1 (the position shown in FIG. 4) by an eject member 4 that also serves as a locking member, and the cassette holder 3 is
When the cassette is slid and inserted between the bottom plate 5 and the left and right side plates 6, 7, the eject member 4 is pushed by the cassette and removed from the holder 3. The cassette is inserted through the front opening of the holder 3 with the side surface on which the head insertion port and the pinch roller insertion port are provided facing toward the right and tilted slightly upward. When the eject member 4 is removed from the holder 3, the holder 3 rotates downward around the pivot 2 due to the elasticity of the spring 8 and comes into close contact with the upper surface of the chassis 1, so that the cassette in the holder 3 is attached to the chassis 1. Then, the reel shaft 9 and capstan shaft 10 are loaded. Also, the eject operation member 11
When the cassette is pushed in the direction of arrow A, the holder 3 rotates upward about the pivot 2, and the eject member 4 pushes the cassette back in the ejecting direction by the elasticity of the spring 8.
At the same time, the cassette holder 3 is locked in the upper position and the operating member 11 is locked in the push-in position. The operating member 11 is released from the locked state by lowering the holder 3 and returns to its initial position.

Such movement between the eject operation member 11 and the cassette holder 3 is performed via the interlocking member 35.

That is, the interlocking member 35 is rotatably attached to the left side plate 6 of the cassette holder 3 as shown in FIG. It is designed to rotate. Further, this interlocking member 35 is provided with a bifurcated leg portion 36 extending downward from the center of rotation, and the front and rear leg portions 36a, 36
The pressing protrusion 11a of the operating member 11 is appropriately engaged between the portions b.

Spring hanging piece of eject member 4 and interlocking member 35
At one end, each end 8a, 8 of a spring 8 is provided as a source of biasing the cassette holder 3 in the direction of the chassis 1.
b is locked.

Furthermore, when the operating member 11 moves forward or backward, the head support plate 12 moves in conjunction with this movement. This head support plate 12 is attached to the back side of the chassis 1 so as to be able to move back and forth in the left and right directions.The right end of the support plate 12 protrudes to the right of the chassis 1, and the magnetic head 13 and the pinch roller 14 is installed. Then, the holder 3 rotates downward,
When the operating member 11 returns from the pushed-in position to the initial position, the head support plate 12 moves to the left and the magnetic head 13 and pinch roller 14 are introduced into the holder 3 through the opening formed in the right side plate 7 of the holder 3. , comes into contact with the magnetic tape in the cassette held by the holder 3. In particular, the pinch roller 14 is pressed against the capstan shaft 10 via a magnetic tape,
The tape is fed by rotation of the capstan shaft 10. Further, when the operating member 11 moves to the push-in position, the head support plate 12 moves to the right before the holder 3 rotates upward, and the magnetic head 13 and the pinch roller 14 are removed from the cassette.

A cassette holding mechanism for stably holding the tape in such a cassette type tape recorder when it is set and preventing the tape from flying out when it is ejected is constructed as follows.

Between the left and right side plates 6 and 7 of the cassette holder 3, there is a rotating member 1 in the shape of an elongated plate as shown in FIG.
5 is rotatably supported. This rotating member 1
5 has a contact portion 16 extending forward (in the cassette insertion direction) from the intermediate portion, and this contact portion 1
6 is bent downward from an intermediate position to face the upper surface of the chassis 1. Further, a tongue piece 17 is provided protruding from one end side of the rotating member 15, and a braking member 18 having a large coefficient of friction is adhered to the back surface of this tongue piece 17. This braking member 18 is made of a plate-like member made of a soft material such as sponge rubber so as not to damage the cassette.

Furthermore, one end of a cassette holding leaf spring 19, which is bent into a substantially dogleg shape, is attached to the base of the abutment portion 16 of the rotating member 15. The other end of this leaf spring 19 extends in the direction of taking out the cassette, and has a dogleg-shaped bent convex portion facing the bottom plate 5 of the holder 3 at a distance, so that the cassette in the holder 3 can be removed from the bottom plate 5. It is designed to be pressed elastically and held stably.

Further, both ends of the rotating member 15 have narrow width parts 21 and 22, and a compression coil spring 20 is wound around the narrow width part 21 at one end.

On the other hand, the left and right side plates 6 and 7 of the holder 3 have locking holes 23 into which the narrow width parts 21 and 22 are inserted, respectively.
24 is open, and the rotating member 15 is connected to the spring 20.
The contact portion 16 is always urged toward the other end, and at the same time, the contact portion 16 is urged to rotate downward. Further, a narrow portion 25 is also provided at the lower end of the abutment portion 16, and the narrow portion 25 is inserted into a locking recess 26 provided in the holder bottom plate 5, and the elasticity of the coil spring 20 causes the narrow portion 25 to The proximal stepped portion of the portion 25 is brought into pressure contact with the holder bottom plate 5.

The leaf spring 19 also has a narrow portion 27 at one end, and a crank portion 27a bent downward in a crank shape is formed in the middle of the narrow portion 27.
Then, the crank part 27a and the other end are connected to the abutment part 16.
It is inserted from below into a square hole 29 through an opening 28 formed in the base of the square hole 29, and is engaged with the tip end edge of the square hole 29. A locking recess 30 is formed at the center top of the opening 28, and a tongue piece 31 formed by cutting and raising the center of the leaf spring 19 is locked in the locking recess 30. .

Therefore, in order to attach the leaf spring 19 to the rotating member 15, as shown in FIG. , press the crank portion 27a of the leaf spring 19 from above as shown by the arrow 33, and insert the other end of the crank portion 27a into the square hole 29.
Then, when the tip 34 of the leaf spring 19 is positioned on the lower surface side of the contact portion 16 and pushed further in the direction of the arrow 32, the tip 34 engages with the edge of the square hole 28 from the lower surface side as shown in FIG. At the same time, the tip of the tongue piece 31 fits into the locking recess 30, and the installation of the leaf spring 19 is completed.

Further, the rotating member 15 is attached to the cassette holder 3 in the following manner.

First, the narrow portion 2 provided at one end of the rotating member 15
1 is wound with a coil spring 20, and with one end of the spring 20 inserted into the left side plate 6 of the holder 3, the narrow part 21 is inserted into the locking hole provided in the left side plate 6 while compressing the spring 20. 23 from the inside, and then insert the narrow portion 22 at the other end of the rotating member into the locking hole 24 provided in the right side plate 7 from the inside.

Then, the rotating member 15 moves to the right due to the restoring force of the spring 20, and the stepped portion of the narrow portion 22 comes into contact with the inner surface of the right side plate 7. Further, the rotating member 15 is given a rotational force by the coil spring 20 in the direction of inserting the narrow part 25 of the contact part 16 into the locking recess 26 of the bottom plate 5, so that the stepped part of the narrow part 25 is inserted into the locking recess 26 of the bottom plate 5. It comes into contact with the top surface of 5. Therefore, the narrow portion 25 is connected to the locking recess 26.
The narrow part 22 cannot be pulled out from the locking hole 24 unless the narrow part 22 is pulled out further, and the rotating member 15 will not be accidentally detached from the cassette holder 3.

When the rotating member 15 constructed as described above is attached to the cassette holder 3, the lower end of the contact portion 16 largely protrudes toward the lower surface of the bottom plate 5 of the holder 3. Therefore, cassette holder 3
When the cassette is inserted into the cassette and the holder 3 is rotated downward, the lower end of the abutting portion 16 comes into contact with the upper surface of the chassis 1 before the bottom plate 5 of the holder 3 does.

Therefore, as the holder 3 approaches the chassis 1 further, the rotating member 15 rotates against the coil spring 20, and as a result of this rotation, the leaf spring 1
9 will force the cassette to be pressed from above.

On the other hand, since the braking member 18 and the leaf spring 19 are located on both sides of the rotational center line of the rotating member 15, when the leaf spring 19 is separated from the bottom plate 5 of the cassette holder 3, the braking member 18 is placed on the bottom plate 5. 5, and conversely, when the leaf spring 19 approaches the bottom plate 5, the braking member 18 separates from the bottom plate 5.

Therefore, when the cassette holder 3 is in the raised position, the gap between the bottom plate 5 of the holder 3 and the leaf spring 19 is widened, so that the cassette can be easily inserted and removed, and the cassette holder 3 is When in the lowered position, the gap between the bottom plate 5 and the leaf spring 19 is narrowed, so that the leaf spring 19 can provide a strong cassette holding force when loading a cassette. Furthermore, when the cassette holder 3 is rotated from the lowered position to the raised position again by the eject operation, the cassette holding force is lost, so that the cassette in the holder 3 is reliably ejected in the ejecting direction by the eject member 4. Become. Moreover, at this time, the braking member 18 approaches the bottom plate 5, and the braking member 18 replaces the leaf spring 19.
8 comes into strong pressure contact with the cassette in the holder 3, the cassette will not pop out too much, and therefore, regardless of the urging force of the eject member 4, the cassette can always be moved to the position where it is easiest to take out. can.

``Problems to be solved by the invention'' However, the structure of the cassette holding mechanism as described above has the following problems.

The number of parts is large and assembly is troublesome.

It is the dogleg-shaped convex portion of the leaf spring 19 that presses down the cassette tape during play, but this only covers a narrow range and cannot cope with variations in the thickness of the cassette tape.

``Means for solving the problems'' and ``effects'' This proposal was developed in view of the above circumstances, and its gist is that when a tape cassette is inserted into the cassette holder, the holder automatically moves to the reset position. In a cassette type tape recorder, the tape cassette is moved to the set position for playback, and when the cassette holder is moved from the set position to the reset position, it automatically stops and the tape cassette is pushed back in the ejecting direction. A rotating member with a curved cassette holding piece integrally protruding from the front and rear sides is installed and supported between the left and right side plates of the holder via square hole bearings and bidirectional rotation regulating stoppers so that it can freely rotate within a predetermined angular range. A deployment spring is placed between the rotating member and the interlocking member to rotate the front side of the rotating member upward when the cassette holder is away from the chassis, and downward when the cassette holder is close to the chassis. Assuming that it will be constructed in a relationship where
The key points are that the number of parts has been drastically reduced and the presser has excellent ability to respond to variations in cassette tape thickness.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is a developed view of the proposed mechanism, and FIGS. 2 a and 2 b are views of the bipolar aspects of the proposed mechanism.

In FIG. 1, reference numeral 40 denotes a rotating member in the form of an elongated plate that is rotatably supported between the left and right side plates 6 and 7 of the cassette holder 3, and is pivoted by shafts protruding from both sides of the member. 41, 42 are fitted into square hole bearings 43, 44 formed in the left and right side plates 6, 7, and have some play in the vertical direction.

In addition, the side plate 6 is provided on one side of the axis of the rotating member 40.
Rotation regulating stoppers 45 and 46 are provided at the upper end, and the rotation member 40 is regulated within a predetermined swing range.

The stopper 45 has a bent end to form a spring attachment portion 45a.

Reference numeral 47 denotes an interlocking member shaped with a spring fastening portion 47a; in the illustrated example, a dovetail grooved projecting piece 48 horizontally protruding from the upright side plate 1a of the chassis 1 is provided to provide a pivot point for the chassis 1; keyhole 49
are assembled in a locking relationship within the operational rotation range.

Reference numeral 50 denotes a deployment spring installed between the spring attachment parts 45a and 47a, which causes the fulcrum to fluctuate as will be described later by the rocking of the interlocking member 47, and provides a suitable cassette holding action.

Curved cassette pressing pieces 51, 52, and 53 are protruded from the front and rear sides of the rotating member 40 to hold down the cassette moving in and out from below.

The pressing action will be explained with reference to FIGS. 2a and 2b.

In the illustrated example, a tension coil spring 50 is installed between the interlocking member 47 and the ejecting member 4 instead of the spring 8 shown in FIG.

Figure a shows the state when the cassette holder 3 is spaced apart from the chassis 1. At this time, the fulcrum (coil portion) 50a of the deployment spring 50 is located in front of the axis of the rotating member 40, so the rotating member 40 is facing forward. Rotate in the supine direction when viewed from above.

On the other hand, in figure b, cassette holder 3 is connected to chassis 1.
At this time, the fulcrum 50a of the deployment spring 50 moves toward the rear of the axis of the rotating member 40, so when the rotating member 40 is viewed from the front, it rotates downward. to strengthen

When inserting a cassette, the cassette holding piece 51 is raised by the urging force of the deployment spring 50 to quickly expand the insertion path, and when the cassette is set for play, the cassette holding piece 51 This is an extremely rational mechanism in which the piece 51 presses down the cassette with the biasing force of the deployment spring 50, and the reversal of one spring performs both functions.

Further, since the above-mentioned cassette holder is biased by the rotating member 47 of the expansion spring 50, one of the square hole bearings 43 and 44 serves as a fulcrum, and the other bearing 43 can move in the vertical direction. As a result, the vertical free play is added to the pressing and descending distance, and the range that can be pressed is expanded, making it possible to completely accommodate variations in cassette thickness.

In addition, when ejecting, press the cassette holding piece 52,
53 is pressed against the cassette by the force of the deployment spring 50 to prevent it from popping out, but the holding effect at this time is exactly the same as that of the cassette holding piece 51 described above.

``Effects of the invention'' As described above, according to the proposed mechanism, assembly is easy with a small number of parts, and it does not have an extremely narrow range of protection like a leaf spring and cannot cope with variations in cassette thickness, and can always be used. Provides stable holding power,
Very suitable.

[Brief explanation of the drawing]

Fig. 1 is a developed view of the proposed mechanism, Fig. 2 a and b are explanatory views of bipolar aspects of the proposed mechanism, Fig. 3 is a plan view showing the mechanical part of the tape recorder, Fig. 4 is a left side view of the same,
FIG. 5 is an exploded perspective view of the main parts, and FIGS. 6 and 7 are sectional views showing how the leaf spring is attached. 40...Rotating member, 41, 42...Shaft portion, 4
3, 44...Square hole bearing, 45, 46...Rotation regulating stopper, 47...Interlocking member, 47a...Spring attachment part, 48...Protrusion piece with dovetail groove, 49...
Keyhole, 50... Deployment spring, 51, 52, 5
3... Curved cassette presser piece.

Claims (1)

[Scope of utility model registration request] When a tape cassette is inserted into the cassette holder, the holder automatically moves from the reset position to the set position and starts playback, and when the cassette holder is moved from the set position to the reset position, it automatically stops and the tape cassette is removed. In a cassette-type tape recorder that is pushed back in the direction, a curved cassette holding piece is integrally projected on the front and rear sides between the left and right side plates of the cassette holder via a square hole bearing and a stopper that restricts rotation in both directions. A rotating member is installed and supported so that it can freely rotate within a predetermined angular range, and a deployment spring is installed between the rotating member and the interlocking member so that the front side of the rotating member is turned upward when the cassette holder is separated from the chassis. A cassette holding mechanism in a cassette type tape recorder, characterized in that the cassette holder is installed in such a manner that the cassette holder is biased to rotate in a downward direction when the cassette holder approaches the chassis.