JPS6041004Y2 - Cassette tape attachment/detachment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cassette tape attachment/detachment device particularly suitable for a cassette tape deck.

In general, cassette tape decks are designed so that the cassette tape can be mounted upright on the deck panel surface in consideration of its operability.

In this case, not only the pair of reel stands but also the head, capstan, pinch roller, etc. are often protruded from the panel surface so that the cassette tape can be loaded and unloaded in a so-called direct loading manner.

FIG. 1 shows a conventional cassette tape loading state using such a direct loading method.
It requires one action of lifting it up diagonally relative to the second one, and then one action of inserting it in the vertical direction, and can be put into the installed state by conveniently moving in two (directions). .

Also, although the detachment state is performed in the reverse order to the above, it still requires two operations.

The reason why such a complicated operation is necessary is that the cassette cannot be inserted into the correct position unless the holding spring is lifted and opened to ensure good retention when the cassette is inserted. This is because there is no such thing, and it was considered unavoidable in a direct loading type.

However, with such conventional cassette tape attachment/detachment devices, the attachment/detachment work is inherently complicated and unreasonable, making it difficult to always attach the cassette in the correct position, and causing damage to the cassette itself and the cassette attachment part. A major drawback was that the parts were easily damaged.

Further, it goes without saying that forcing the user to perform complicated attachment/detachment work is undesirable in terms of serviceability.

Therefore, this idea was made in view of the above points, and it is possible to attach and detach the cassette in a straight in-out manner by just one movement in a direction approximately perpendicular to the cassette mounting surface. It is an object of the present invention to provide an extremely good cassette tape attachment/detachment device which reduces the operating force required at that time as much as possible and which can firmly hold the cassette tape with a strong force when it is attached.

First, to briefly explain the principle of this invention, as shown in Fig. 2, each end of each cassette assumes a position protruding from the cassette mounting part as shown by the chain line in the figure when not mounted, and each lock-shaped end assumes a fully open position. Holder lever 21, 2 with the other end
2 (However, 22 is 22 a, 22 in the examples described later)
b) are rotatably provided in an interlocking relationship by a connector (not shown).

By simply inserting the cassette 20 into such an attachment/detachment device in the vertical direction as shown by arrow C, the cassette 20 is placed in the attached state with the holder levers 21 and 22 at the positions shown by the solid lines in the figure.

In other words, in this installed state, one end of each of the holder levers 21 and 22 is pushed by the back surface of the cassette 20 and rotates so as to move backward, so that each lock-like end assumes a closed position and the corner of the cassette 20 is closed. It should be held firmly.

Furthermore, when removing the cassette, it is sufficient to simply pull out the cassette in the vertical direction as shown by the arrow.

By the way, in this case, the holder levers 21, 22 are brought into the open position and the closed position by the cooperation of an unillustrated bistable spring (referred to as a position spring in the embodiment described later) that engages with these. The operating force required when attaching and detaching the cassette 20 is reduced.

In other words, if a certain amount of pressing force is applied when installing the cassette, the cassette can be placed in the installed state by the force of the bistable spring, and on the other hand, if a certain amount of pulling blade is applied when the cassette is removed, the cassette can be placed in the detached state by the force of the bistable spring. It's something you get.

However, in order to properly hold the cassette in the installed state after it has been installed, it is necessary to use a spring force other than the above-mentioned bistable spring to hold it, but the spring force for this holding is due to the above-mentioned bistable spring in the installation direction. If the device resists the acting force, the operating force during installation will increase accordingly, which is not preferable.

In this case, if an attempt is made to reduce the operating force during attachment by increasing the force of the bistable spring, the operating force during detachment will conversely increase, which is not preferable.

Therefore, with this type of straight-in-out type cassette tape attachment/detachment device, there is a contradictory relationship between being able to attach and detach with as little operating force as possible, and at the same time, the attached state must provide as strong a holding force as possible. It is necessary to solve the problem.

Next, an embodiment of this invention based on the above principle will be described in detail with reference to the drawings.

That is, in FIG. 3, an operating section 31 such as a volume, sound quality, etc. adjustment section and a display section is provided on the panel 30, and a tape section 32 such as a cassette tape loading section and various tape operation setting sections is provided. This figure shows an example of mounting a cassette tape deck.

Further, FIG. 4 is an enlarged detailed view showing the tape section 32 extracted from FIG. 3, and as described later, it is a direct loading type, and the cassette tape 20 can be attached and detached in a straight-in-out type. It has a cassette tape attachment/detachment section 321 and a touch switch type tape operation setting section 322 which can similarly set the tape operation in an electronically controlled manner.

Here, the cassette tape attachment/detachment part 321 has a pair of capstans 33a and 3 for a double capsun type at the bottom.
3b, pinch rollers 34a, 34b and magnetic head 3
5 is provided, and a pair of reel stands 36a, 3 are provided in the center.
6b are provided, and lock-shaped ends 21a, 21 of the aforementioned holder levers 21, 22a, 22b are provided at the upper and lower four corners.
b, 22al, and 22bl protrude inside the covers 37a and 37b, details of which will be described later.

Therefore, FIGS. 5a and 5b show the cassette tape attachment/detachment section 3.
21 (however, the front view and the top view are with the covers 37a and 37b removed)
In the figure, 41 is the main chassis for attachment.

A vertically movable head slider 42 is provided at the bottom of the main chassis 41, and the head slider 4
A pair of pinch rollers 3 with the head 35 sandwiched between them
4a and 34b are rotatably provided opposite to a pair of capstans 33a and 33b provided through the main chassis 41.

Furthermore, a pair of left and right reel stands 36a are provided in the center of the main chassis 41.

36b is rotatably provided.

A horizontally elongated holder lever 21 is provided at the upper part of the main chassis 41, and in this case, both ends of the holder lever 21 take two stable positions on a shaft 44 installed between a pair of lever mounts 43a and 43b. position spring 45
It is rotatably supported via a and 45 b.

Here, the holder lever 21 has a lock-like end 21 at its upper part.
a, 21b, and an engaging end 21c at the bottom thereof.
.
Notches 46 a, 46 b, and 46 c are formed to engage with.

Further, near both ends of the lower part of the main chassis 41, holder levers 22a and 22b are rotatably supported with respect to a pair of lever mounting bases 47a and 47b. The holder levers 22 a and 22 b are connected to the holder lever 21 by engaging both ends of a shaft 44 that supports the holder lever 21 with the other ends of a pair of connecting sliders 49 a and 49 b that are engaged with one end of the shaft 44 that supports the holder lever 21 . It is made in an interlocking relationship.

Here, the holder levers 22a, 22b have lock-shaped ends 22al, 22bl at the upper part thereof, and engagement ends 22a2, 22b2 at the lower part thereof, so that the holder levers 22a, 22b have a substantially U-shape on the road surface. A holder spring 50a, which has lock-shaped tip portions 51al and 51bl facing each other near its upper portion, and is engaged between each other end and the fixed portion;
A pair of holders 51a and 51b, which are always biased clockwise, are coaxially and rotatably supported via the holder 50b.

In this case, the holders 51a and 51b are in a state where no cassette is attached, and the holder levers 219 22a are attached.

In the closed state of holder lever 22b, it acts as a stopper for regulating the position in the direction of the biasing force, and also serves as a stopper for rotating in the same direction when the holder levers 22a and 22b come into contact with their back surfaces in the process of opening. It has protrusions 51a2 and 51b2 that serve as joint parts.

In addition, in the figure, 52 a, 52 b, and 52 c are cassette receiving pins planted in the central part and both ends of the main chassis 41, respectively.
Since the upper part of the cassette c is tapered, it also serves as a guide on the head side when attaching and detaching the cassette 20, which will be described later.

Also, 531! Reference numeral 53b denotes a guide member on the side opposite to the head when the cassette 20 is attached or detached.

Next, the cassette tape attachment/detachment section 32 configured as described above.
1, that is, the attachment and detachment state of the cassette tape 20 will be explained with reference to FIGS. 5 and 6.
Assuming that the holder levers 21, 22a and 22b are in a state in which the holder levers 21, 22a and 22b are opened outward from each other as shown in FIG. The former lower end portions 21c and 21d, which are higher and on the opposite side of the head 35, are lowered.

Therefore, when the cassette 20 to be loaded is manually inserted in the vertical direction as shown by arrow A, the cassette 20 becomes slanted as described above during the insertion process as shown in Figure b, that is, the cassette 20 is fully opened. Holder levers 21, 22a, 2 located in
2b, each holder lever 21, 22a, 22b is pushed into contact with the tip end of each end 21C, 21d, 22a2, 22b2 of the shaft 44. 48 a and 48 b are used as fulcrums to rotate inwardly toward each other.

When this operation reaches a certain state, the position springs 45at45b, which are attached to both ends of the holder lever 21, are gradually moved from the first stable position in the state shown in FIG. 6 and finally die. Since the point is exceeded, from this point on, the position spring 45 a,
The holder lever 21 is rotated by the force that moves the holder lever 45b to the second stable position that it assumes in the state shown in FIG.

In this case, the holder levers 22a and 22b are also rotated in the same manner because they are linked to the holder lever 21 by the connecting sliders 49a and 49b.

Thus, when the holder levers 21.22a, 22b are pivoted inwardly toward each other in the closing direction, their respective locking ends 21a, 21b, 22al, 22bl slide over the rear and front upper corners of the cassette 20. The lower surface of the cassette 20 contacts the cassette receiving pin 52a and is pushed in the insertion direction.

Press and hold it in contact with 52b and 52c.

In this case, the lock-shaped tips 51al, 5 of the holders 51a, 51b supported by the holder levers 22a, 22b
1bl rides over the front end of the cassette 20 and presses against the upper corner, so that the cassette 20 is held firmly.

This completes the cassette mounting operation using the straight-in method and direct loading method in which the cassette 20 is inserted vertically into the cassette mounting portion.

In this case, by operating a desired touch switch of the tape operation setting section 321 while the cassette 20 is installed, a predetermined operation state can be electronically controlled.

Next, to explain the case where the cassette 20 is removed, the cassette 20 that has been installed as described above is simply pulled out in the vertical direction as shown by the arrow by a person's hand. It is possible to leave in a straight-out manner.

That is, in this case, when the cassette 20 is pulled out in the vertical direction as shown by the arrow in the state shown in FIG. A force is applied to the holder lever 22bl in order to rotate the holder levers 21, 22a, 22b in the outward opening direction. 6
The transition to the fully open state shown in the figure is easily understood.

Furthermore, in this case, as described above, the holder lever 22a
, 22b engage with the holders 51a, 51b in the process of opening, and a force that resists the biasing force is applied, which of course releases the upper corner of the cassette 20 from being held.

In addition, in the above, the holder lever 22a is connected to the holder lever 21 by the connecting sliders 49a and 49b.
, 22b are interlocked because even if the cassette attachment/detachment work can be done in a straight-in-out manner, the cassette 20
It is naturally predictable that the insertion or withdrawal direction of the cassette will not deviate or deviate from the vertical direction, and that the amount of deviation will be different. That's the aim.

In other words, although it is considered that the posture of the cassette 20 when attaching or detaching the cassette to the cassette mounting surface changes somewhat from time to time, if the holder lever 21 and the holder levers 22a and 22b are in an interlocking relationship, If not, the holder levers 21, 22a, 2 that come into contact with the cassette 20 when attaching or detaching the cassette.
Since the order in which the ends 21c, 21d, 22a2, 22b2 or the conical ends 21a, 21b, 22al, 22b1 of the holder lever 21 or the holder levers 22a, 22b are rotated in an indeterminate order is not fixed. Due to the fact that the cassette starts to move, or in some cases only one side of the cassette moves, it is not possible to guarantee that the cassette is always correctly inserted and removed.

In addition, unless the levers 21, 22a, 22b are interlocked, it is necessary to attach position springs to the levers 22a, 22b, which complicates the configuration and causes the above-mentioned problem due to the difference in dead center. Both levers 21, 22a, 22b may encourage undesired movements such as
From this point of view as well, it is desirable to have these in an interlocking relationship.

Next, we will explain the cassette detection mechanism suitable for the above-mentioned direct loading type and straight-in-out type cassette attachment/detachment, as shown in Figures 5a and b above. Holder lever 2
1 and a cassette detection mechanism 60 provided in association with the cassette detection mechanism 60.

Here, the cassette detection mechanism detects the presence or absence of a claw provided for the purpose of preventing erroneous erasure peculiar to so-called cassette tapes, a claw provided for the purpose of detecting the tape type, etc.
Alternatively, it refers to something that detects whether or not the cassette itself is attached to the cassette attachment section.

The latter is especially necessary in the case of an electronically controlled mechanism that sets the tape to a predetermined operating state to prevent undesirable accidents that may occur when the head slider, etc. is operated without a cassette installed. This is the result.

That is, as shown in FIGS. 5a and 5b, the tape type detection lever 61 and the cassette presence/absence detection lever are arranged so as to be rotatable about the shaft 44 in correspondence with the rear notches 46a, 46b, and 46C of the holder lever 21. 62 and an erroneous erasure prevention claw detection lever 63 are provided.

Furthermore, a slider mount 64 is provided on the back surface of the main chassis 41, and includes a pair of lever mounts 43a and 43b that are integrally suspended.

Here, a switch slider 65 is provided on the slider mounting base 64 in an interlocking relationship with the holder lever 21 and is slidable in the vertical direction (however, in the state shown in FIG. 5).

Additionally, leaf switches 66, 67, and 68 are provided on the switch slider 65 in a positional relationship corresponding to the rear portions of the respective detection levers 61, 62, and 63.

In the above description, it is assumed that the switch slider 65 is on the lower side when the holder lever 21 is open, and is on the upper side when the holder lever 21 is closed.

Thus, the cassette detection mechanism 60 configured as above
The action will be explained with reference to FIGS. 7a and 7b.

That is, in FIG. a in which the cassette 20 is in the installed state, the holder lever 21 is in the closed state and the switch slider 65 is located on the upper side, so each detection lever 61,
62.63 is rotated clockwise by the rear end of the cassette 20 or a claw to connect the corresponding leaf switch 66.67.68
is turned on.

This makes it possible to detect that the cassette is installed, that it is a regular tape, and that it is ready for recording.

In this case, even if the cassette is installed, if the detection claw is broken, the leaf switches 66 and 68 will be in the OFF state, so although the cassette is installed, it is likely that the chrome tape is used instead of regular tape. It is possible to detect that the recording is disabled and that recording is not possible.

In addition, in Figure b, where the cassette is not installed, the holder lever 21 is in the open state and the switch slider 65 is in the open state.
has moved downward as shown by the arrow, so each leaf switch 66, 67, 68 is in a position where it cannot engage with each detection lever 61, 62, 63, so all of them are in the OFF state.
It is possible to detect that the cassette is not attached.

In the above, each detection lever 61, 62, 63 is connected to the seventh
In the case shown in the figure, rotation in the counterclockwise direction shown in the figure is restricted, and the lower ends 61b, 62b.

Since the rotation in the clockwise direction in the figure is restricted by 63b, that is, it is fixed at the position shown in Figure 7 and cannot rotate in any direction any further.
This prevents malfunctions such as pressing the spring pieces of each leaf switch 66, 67, 68.

Furthermore, in the cassette detection mechanism 60 as described above, each leaf switch 66, 67, 68 is connected to the holder lever 2.
1 and each of the detection levers 61, 62, and 63, the leaf switch 6
The spring forces of 6, 67, and 68 do not significantly interfere with the spring forces of the position springs 45a and 45b acting on the holder lever 21.

That is, each leaf switch 66, 67, 68 does not directly apply much load to the position springs 45a, 45b, so the position springs 45a, 45
This eliminates the need to increase the spring force of b and also makes the overall operation lighter.

FIG. 8 shows the position spring 45a in the above configuration.

This diagram schematically shows the acting force of 45b, and the straight line A-A'
is the original spring force of the position springs 45 at 45 b.

On the other hand, when the cassette is installed, a is obtained by subtracting a slight loss due to the spring force of the leaf switches 66, 67, and 68 (however, this includes the force required to pull the switch slider 65 upward) as shown in the shaded area B. The force is the actual active component due to position springs 45a, 45b.

Furthermore, when the cassette is removed, a force b obtained by subtracting the loss caused by the holder springs 50a and 50b, shown by the shaded area C in the figure, is the actual effective component of the position springs 45a and 45b.

In other words, the position spring 4 is
The loss of the spring force of 5a+45b is small, and the active ingredient is sufficient to reduce the required operating force and hold the position spring 45a firmly with a strong force in the attached state. , 45b can be avoided unnecessarily, that is, the operating force can be avoided.

This is brought about by the unique structure of this invention, in which one end of the holder spring 50aw50b is engaged with a fixed part so that no drag is applied to the holder levers 22a, 22b.

That is, if one end of the holder springs 50a, 50b is not engaged with a fixed part but is engaged with the holder levers 22a, 22b, a counterclockwise drag force will always be applied to the holder levers 22a, 22b. Therefore, the acting force of the position springs 45a and 45b at this time is calculated by simultaneously subtracting the loss in the sloped part B and the loss in the shaded part C from the straight line A-A' when the cassette is installed, as shown in FIG. This is because only the force of a') will remain as an active ingredient, and in order to compensate for this and be able to hold it firmly, position springs 45 a, 45 are used.
This is because if the spring force b is increased, it acts in the direction of increasing the operating force, which is not preferable.

Therefore, as detailed above, according to this invention, the cassette can be installed and removed in a straight-in-out manner, if only one movement in the direction approximately perpendicular to the cassette mounting surface is required, and at the same time, the necessary It is possible to provide an extremely good cassette tape attachment/detachment device that requires as little operating force as possible and can firmly hold the attached state with a strong force.

[Brief explanation of the drawing]

Fig. 1 is a side view for explaining the loading/unloading state of a cassette using the conventional direct loading method; Fig. 2 is a side view for explaining the principle of the cassette tape loading/unloading device according to this invention; FIG. 4 is a partially detailed view showing an enlarged view of the cassette tape attachment/detachment section of FIG. 3; FIGS. 5 a and b; FIG. are a front view and a side view of the same, FIGS. 6 and 7 a and 7 b are operation state diagrams of the same embodiment, and FIGS. 8 and 9 are curve diagrams schematically showing the acting force of the position spring. 20...Cassette tape, 21.22a, 22
b...Holder lever, 41...Main chassis, 43a, 43b, 47a, 47b = Lever mounting base, 44t 48 at 48 b------
Single axis, 49a. 49b...Connection slider, 45 at 45
b...Position spring, 50a, 50b...
...Holder spring, 51a, 51b...Holder, 60...Cassette detection mechanism, 61,6
2.63...Detection lever, 64...Slider mounting base, 65...Leaf switch, 66
．． 67.68...Leaf switch.

Claims (1)

[Scope of utility model registration request] Each has a lock-like end at the top and an engaging end at the bottom, and is formed in a substantially U-shape on the side, and each end rotates facing each other at both ends of the cassette mounting section. First and second Holter levers are freely connected and supported, and each lower part is engaged with one of the first and second holder levers and is connected to the first and second holder levers when the cassette is not attached. a first position in which the engaging ends of the cassettes are located on the cassette mounting surface and the respective upper locking ends are opened outward from each other; and a position spring that is coaxial with a holder lever located on the head side of the first and second Holter levers. A holder comprising a lock-shaped upper end that is rotatably supported and is removable from the upper end of the cassette, and a retaining part that is removable from the holder lever; A cassette tape characterized in that it is provided with a holder spring that applies a biasing force in the direction, and one end of which is attached to a fixed part, and the cassette can be attached to and detached from the cassette mounting surface in a straight in-out manner. Attachment and detachment device.