JPH04168645A - Cassette tape player - Google Patents

Abstract

PURPOSE:To achieve an accurate positioning of a cassette by forming a shape so that the cassette can be positioned when a bearing of a capstan is inserted into a guide hole. CONSTITUTION:A circumferential part with a diameter contacting guide holes 5a and 5b at three points as in for example a guide protrusion 26 is provided at a bearing 33 of a capstan 23 or a flange part and a sleeve part which are part of the bearing 33. When the cassette is fitted, the capstan 23 is inserted from the guide hole 5b and a pad 24 is inserted from a hole for capstan 3b. Then, a pinch roller 22 is inserted from a small window 4b in the case of reproduction and a tape pressed against the capstan 23, thus resulting in a constant- speed running. Therefore, even if the capstan 23 is inserted into the guide holes 5a and 5b, the position of the cassette which is loaded by the bearing 33 can be fixed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cassette tape player for recording and playing back compact cassette tapes.

[Summary of the Invention] The present invention is a cassette tape player in which a capstan is inserted through a guide hole of a compact cassette tape, and in particular, when the capstan is inserted into the guide hole, a predetermined portion of the bearing is inserted into the guide hole. The compact cassette tape is shaped so that it can be brought into contact with the compact cassette tape to position it.

[Prior Art J] Figure 8 is a perspective view of a compact cassette tape (hereinafter simply referred to as a cassette). The magnetic head window 1 is used for magnetic head operations, the pinch roller windows 2a and 2b are used to insert and remove the pinch roller (and erasing head depending on the model), the capstan holes 3a and 3a are used to insert the capstan, and especially the reverse a small window 4a into which the erasing head is inserted and removed in the case of a recording/playback device of the type capable of recording;
4b, and guide holes 5a and 5b into which the guide protrusions are inserted.
are each standardized. Further, a bad drawer is attached inside the magnetic head window 1 so as to be biased in the direction of the tape T.

The head unit of a cassette player into which such a cassette is installed differs somewhat depending on the model, but is roughly divided into shapes and holes as shown in FIGS. 9(a) to 9(d). In FIG. 9, 11 is a magnetic head, 12 is a pinch roller, 13 is a capstan, 14 is an erasing head, and 15
indicates a guide protrusion.

Here, the guide protrusion 15 inserted into the guide holes 5a and 5b is provided so as to protrude in a substantially conical shape on the chassis 16, as shown in FIG. Then, as shown in FIG. 10(b), the position of the cassette on the head unit side is guided by contacting the slightly rectangular guide holes 5a and 5b at three points.

[Problems to be Solved by the Invention] However, when configuring a head unit in which a capstan is inserted into one guide hole, for example, it is of course impossible to position the guide hole using a guide protrusion. become unable.

If the cassette positioning becomes unstable even to some extent, it may lead to fluctuations in the playback level, deterioration of azimuth characteristics, increase in wow and flutter, etc., and is extremely disadvantageous in terms of the performance of the cassette player. For this reason, it has been difficult to realize a head device that takes advantage of the structure in which the capstan is inserted into the guide hole, for example.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and when the head device section is configured so that the capstan is inserted through the guide hole of the cassette, the capstan is The present invention provides a cassette tape player in which the bearing is shaped so that the cassette can be positioned when inserted into the guide hole.

[Function] By providing the capstan bearing, or the flange portion or sleeve portion that is a part of the bearing, with a circumferential portion having a diameter that contacts the guide hole at three points in the same way as the guide protrusion, the capstan can be Regarding the inserted guide hole part,
A position guiding effect on the head unit side of the cassette can be obtained.

[Example] Figures 1(a) and 1(b) show the configuration of a head unit in which a capstan is inserted through a guide hole of a cassette (in particular, by rotating one capstan in the forward and reverse directions). This conceptually shows an embodiment of the present invention based on a so-called single capstan reverse system configuration that enables not only constant speed recording and reproducing running in the normal direction but also constant speed recording and reproducing running in the reverse direction. be.

In the figure, 21N is a magnetic head for normal running (hereinafter referred to as
21R is a magnetic head for reverse running (hereinafter referred to as reverse head), 22 is a pinch roller, 23 is a capstan, 24 is a pad attached to the head device side, 25N, 25R are erase head.

26 indicates a guide protrusion.

FIG. 1(a) shows an example of a single capstan reverse system for playback only. When a cassette is loaded, a capstan 23 is inserted through the guide hole 5b, and a pad 24 is inserted through the capstan hole 3b. be done.

During playback, the pinch roller 22 is inserted through the small window 4b and the tape T is pressed against the capstan 23 to run at a constant speed.In the case of normal run playback, the normal head 21N is inserted through the pinch roller window 2b. Also, when reproducing reverse running, the reverse head 2
1R is inserted through the magnetic head window 1.

In this case, the position guide of the cassette is achieved by a substantially conical guide protrusion 26 abutting the guide hole 5a, and a circumferential portion of the guide hole 5b having a diameter such that three points contact the guide hole 5b. Capstan 23 provided
This is achieved by the bearings 33 of the two being in contact with each other.

Next, FIG. 1(b) shows an example of a single capstan reverse system that allows recording and playback.
The N and reverse heads 21R are each used as a recording/reproducing head.

When the cassette is loaded, the capstan 23 is inserted through the guide hole 5a, and the pad 24 is inserted into the capstan hole 3.
It is inserted from a. And the pinch roller 22 is a small window 4a.
Normal head 21N during normal driving (and erase head 25N during recording)
is inserted through the magnetic head window 1, and the reverse head 21R (and erasing head 25R during recording) is inserted through the pinch roller window 2a during reverse running.

In this case, the position guide of the cassette is achieved by a substantially conical guide protrusion 26 abutting the guide hole 5b, and a circumferential portion of the guide hole 5a having a diameter such that three points contact the guide hole 5a. Capstan 23 provided
This is achieved by the bearings 33 of the two being in contact with each other.

The configuration of the head unit that realizes the single capstan reverse method shown in FIGS. 1(a) and 1(b) is as follows: the capstan 23 is connected to the guide hole 5a.

5b, the normal head 21N is closer to the supply reel during normal running than the capstan 23, and the reverse head 21R is closer to the capstan 23.
Capstan 2 is positioned closer to the supply reel during reverse running than Capstan 2.
3 is located closer to the take-up side than the magnetic head, so that tape running is always stable. And furthermore,
By allowing the bearing 33 of the capstan 23 to act as a cassette guide, the problems caused by inserting the capstan 23 into the guide hole are also solved.

A specific example corresponding to the conceptual diagram of FIG. 1(a) will be described below.

FIG. 2(a) simply shows the drive transmission system of the cassette tape player of this embodiment, where 30 is a motor unit capable of forward and reverse rotation, 31 is a belt, 32 is a flywheel, and 33 is a It is a bearing, and the capstan 23 is driven at a constant speed in forward and reverse directions using a so-called disk drive method. At this time, the capstan 23 is at a position where it is inserted into one of the guide holes 5b when the cassette shown in FIG. 8 is loaded.

Note that 632a shown in FIG. 2(b) as a side cross-sectional view of the constituent parts of the capstan 23 and the flywheel 32 is a groove portion around which the belt 31 is wound, and 32b is a drive gear mounted on the flywheel 32. be. The capstan 23 is held at the center of the flywheel 32 and the bearing 33, thereby transmitting the rotational force from the motor section 30.

Here, the bearing 33 is formed with a circumferential portion 33b having a diameter that contacts the inner wall portion of the rectangular guide hole 5b at three points following the flange portion 33a, and further abuts against the cassette half to contact the inner wall portion of the rectangular guide hole 5b. Stepped portion 33 that is not inserted inside
c is provided.

In addition, in FIG. 2(a), 34 is a flywheel 32.
A reduction gear that meshes with the upper drive gear 32b, 35 a letter 1 lever whose rotation axis is the center of the reduction gear 34, 36 a transmission gear during normal running that is pivotally supported by one end 35a of the letter 1 lever 35, Reference numeral 37 designates a transmission gear during reverse running which is pivotally supported by the other end 35b of the 1-shaped lever 35, 38.39 a reel gear, and 40.41 a reel stand. Transmission gear 36.
37, rotational force is transmitted from the reduction gear 34 via the clutch portion 34a.

42 is a normal reverse lever (hereinafter referred to as NR lever), and long holes 42a and 42b have regulation bins 43a,
43b is inserted and supported, allowing sliding movement. Further, a torsion coil spring 44 is attached to the protrusion 42c, and the protrusion 35 of the character 1 lever 35
It is connected to c. Although the slide movement means of the NR lever 42 is not shown, it may be any means that slides in the N direction and the R direction in conjunction with normal driving operation and reverse driving operation (such as a cam gear with missing teeth or a plunger). Various possibilities are possible.

In addition, 45 is a reduction gear 34 during fast forwarding and rewinding,
In order to connect the reel gear 39 or 38 with the gear 46, this lever is rotated in the direction of the arrow FR by a mechanism not shown.

The state of such a drive transmission system during normal running is shown in FIG. 2(c).

In other words, when the normal driving operation is performed, the NR lever 4
2 is slid to the normal position, and as the NR lever 42 slides, the 1-shaped lever 35, which is connected to the NR lever 42 by a torsion coil spring 44, rotates to the left. Then, the transmission gear 36 contacts and meshes with the reel gear 38. Therefore, the rotational force in the normal direction N from the motor section 30 is transmitted to the flywheel 3 via the belt 31.
2 and drives the capstan 23 in the NC direction, and at the same time, from the drive gear 32b of the flywheel 32 through the reduction gear 34, the clutch part 34a, the transmission gear 36, and the reel gear 38, the winding reel is driven during normal running. A certain reel stand 40 is rotationally driven.

Next, when driving in reverse, the NR lever 42 slides to the reverse position, as shown in FIG. 2(d).
Accordingly, the 1-character lever 35 is rotated to the right. Then, the transmission gear 37 meshes with the reel gear 39. Therefore, when the motor section 30 rotates in the reverse direction R, the rotational force drives the flywheel 32 via the belt 31 and drives the capstan 23 in the R6 direction. 3
4a, the transmission gear 37, and the reel gear 39, the reel stand portion 41, which is a take-up reel during reverse running, is rotationally driven.

Next, the configuration of the head device section of this embodiment is shown in FIGS. 3(a) and 3(b).
) will be explained using a cross-sectional view and a side view.

The head device section is three-dimensionally constructed relative to the N'R lever 42, and 47 is a crimp lever attached to the NR lever 42, and 6, 48N, and 48R are normal levers that slide together with the NR lever 42. This is a head lever that moves the head 21N and reverse head 21R toward and away from the tape in the cassette, and the head base plates 49N and 49R (
The normal head 21
Equipped with N and reverse head 21R. Both head levers 48N and 48R are rotatably supported from an upper substrate 51 by a shaft portion 50.

A pinch lever 52 is rotatably supported from the upper substrate 51 by a shaft 53, and the pinch roller 22 is pivotally supported at its tip 52a. Further, as can be seen from FIG. 3(b), a protruding pin 52b is provided which reaches from above to the height position of the pressure bonding lever 47. Here, the pinch roller 22 and the tip portion 52a that pivotally supports the pinch roller 22 are sized to be inserted into the small windows 4a and 4b of the cassette.

Note that the head levers 48N, 48R1 and the pinch lever 52 have their respective tip portions urged in the direction of arrow A with respect to each rotating shaft by a biasing means such as a spring or winding spring (not shown).

Reference numeral 54 indicates a pad lever rotatably attached to the chassis, and one end of this pad lever 54 is provided with a protruding piece 54a that protrudes upward.
A pad 24 is attached to a position facing the normal head 21N with a tape interposed therebetween. The bad lever 54 is made of a shielding material such as permalloy, and the protruding piece 54a and the pad 24 are sized and positioned so that they can be inserted into the capstan hole 3b of the loaded cassette. In addition.

This pad lever 54 is also configured such that the protruding piece 54a is biased in the direction of the arrow with respect to the rotating shaft 54b by a biasing means such as a spring SP.
c comes into contact with the locking body 56, thereby restricting the rotation of the pad 24 portion in the direction of the normal head 21N.

The head unit is generally configured as described above, and takes three states: normal running, reverse running, and stop (including tape fast forwarding and tape rewinding; the same applies hereinafter).

First, the movement of the pinch roller 22 toward and away from the capstan 23 will be explained with reference to FIGS. 4(a) to 4(c).

The above-mentioned crimp lever 47 has a trapezoidal notch 47a formed therein as shown in FIG. 4, and the pinch lever 52 is biased away from the capstan 23 as described above. , when stopping, Figure 4 (a)
), the protruding pin 52b is fitted into the notch 47a, thereby separating the pinch roller 22 and the capstan 23.

However, during normal driving, as the NR lever 42 slides as described above, the crimp lever 47 attached to it also slides at the same time as shown in FIG. do. Therefore, the pinch lever 52 is pushed out in the opposite biasing direction, and the pinch roller 22 and capstan 23 are brought into pressure contact. At this time, since the capstan 23 is rotating at a constant speed in the Nc direction, the tape T is sandwiched between the pinch roller 22 and the capstan 23 and runs at a constant speed in the normal direction.

Also, when driving in reverse, the NR lever 42 is
Similarly, when the crimp lever 47 slides as shown in FIG.
and the capstan 23 are brought into pressure contact. At this time, the capstan 23 is rotating at a constant speed in the Re direction, and therefore, the tape T is sandwiched between the pinch roller 22 and the capstan 23 and runs at a constant speed in the reverse direction.

Next, Section 5 (a) to (c) describes the contact and separation operations of the normal head 21N and reverse head 21R with respect to the tape T.
).

As mentioned above, the head levers 48N and 48R are attached to the shaft portion 5.
0 in the anti-capstan direction, and push-out pins 42d and 4 are placed on the NR lever 42.
2e is formed, so at the time of stop, the image shown in Fig. 5 (
As shown in a), the pusher pins 42d and 42e are in contact with the tip portions 48Na and 48Ra of the head levers 48N and 48R. In this state, both heads are 21N.

21R is not in contact with the tape T (not shown).

However, during normal running, the push-out pins 42d and 42e also slide as the NR lever 42 slides, so the push-out pin 42d pushes out the helad lever 48N in the direction of the tape T, as shown in FIG. 5(b). Rotate it. Then, the normal head 21N mounted on the head lever 48N is pushed out in the direction of the tape T, while the pushing pin 42e does not act on the reverse head 21R side. The pushed out normal head 21N presses the pad 24 inserted from the cab scan hole 3b through the pinch roller window 2b of the attached cassette with the tape T interposed therebetween. Therefore, the tape T is sandwiched between the normal head 21N and the pad 24, making it possible to reproduce the tape during normal running.

During reverse running, the push-out pins 42d and 42e move as shown in FIG. 5(C) as the NR lever 42 slides, and the head lever 48R is pushed out by the push-out pin 42e, while the normal head 21N side is pushed out. Since the action of the push-out pin 42d is released, the reverse head 21R comes into pressure contact with the tape T of the loaded cassette, making it possible to perform a reproducing operation during reverse running. At this time, the tape T is sandwiched between the reverse head 21R and the pad 6 attached within the magnetic head window l of the cassette.

The positional relationship between the head unit and the mounted cassette in the cassette tape player of this embodiment as described above is shown in FIGS. 6(a) and 6(b) (this is an example during reverse running).

That is, when a cassette is loaded, the capstan 23 is inserted through the guide hole 5b, while a guide protrusion 26 similar to that of a conventional cassette player is fitted into the guide hole 5a. Here, positioning on the guide hole Sb side is performed by the circumferential portion 33b of the bearing 33 of the capstan 23, which has the same diameter as the guide protrusion 26.

As shown in FIG. 7, the insertion positional relationship between the bearing 33 and the guide hole 26 is such that insertion into the guide hole 26 is locked at the stepped portion 33c, and the circumferential portion 33b is inserted into the guide hole at three points other than the small window 4b side. It is in contact with 26.

Further, as shown in FIG. 6(a), the pad 24 attached to the protruding piece 54a of the bad lever 54 is inserted into the capstan hole 3b of the cassette, while the capstan hole 3a is not used.

Further, the reverse head 21R is inserted and removed from the magnetic head window 1, the normal head 21N is inserted and removed from the pinch roller window 2b, the pinch roller 22 is inserted and removed from the small window 4b, and the pinch roller window 2a and the small Window 4a is not used.

In this way, in this embodiment, by inserting the capstan 23 through the guide hole 5b, the heads are arranged on both sides of the capstan 23 so that it functions alternately in normal and reverse modes, and also in normal driving. The reproducing head is always located between the capstan 23 and the reel on the side that feeds out the tape T, not only when running in reverse.

In other words, in this embodiment, since the capstan 23 always acts to pull the heads (normal head 21N, reverse head 21R) that perform playback operation at a constant speed from the take-up reel side, the tape runs normally. The single capstan reverse system, which conventionally had the problem of unstable tape running during reverse, can be configured to be fully practical.

Therefore, it is possible to actually realize the advantages of the single capstan reverse method, such as low cost, reduced power consumption, light weight, and small size, and it is particularly suitable for portable cassette tape players. .

Further, since the position of the guide hole into which the capstan 23 is inserted is guided by the bearing 33, the cassette position can be stabilized even when the capstan 23 is inserted into the guide hole. Therefore,
There are no negative effects such as output level fluctuation, deterioration of azimuth characteristics, or increase in wow and flutter due to instability of the cassette position, leading to stable performance. This means that the head device that makes up the system can be put to practical use.

Further, in the case of this embodiment, the structure of the drive transmission system is particularly simple because of the single capstan, which is very advantageous in terms of wow and flutter and speed deviation.

Furthermore, the guide hole 5b of the cassette is the capstan hole 3.
Since the capstan 23 is formed approximately 5 mm deeper than the guide hole 5b, the center position of the capstan 23 is approximately 1 mm deeper than the conventional cassette player. It will be formed 5mm deeper. This makes it possible to use a flywheel that is approximately 3 mm larger in diameter than the conventional one, and therefore also makes it possible to improve the moment of inertia of the flywheel 32.

Furthermore, since the head unit can be configured within the left half of the cassette in FIG. 6, the degree of freedom in design and mechanical design of the cassette player housing, which corresponds to the right half, is greatly improved. .

Incidentally, in this embodiment, a disk drive type drive transmission system is taken as an example, but a direct drive type in which the flywheel is directly rotated by the motor shaft may be used.

In the present invention, the positions of the heads and the like relative to the holes and windows of the cassette are not limited to the examples shown in FIGS. 1(a) and 1(b). It is also conceivable to avoid using the magnetic head window 1 instead of using the magnetic head window 1. In any case, when the capstan is inserted into the guide hole 5a, 5b, the bearing of the capstan should be formed in a shape that has a guiding action with respect to the guide hole 5a, 5b. .

In addition, an embodiment based on a single capstan/reverse system configuration has been described, but a one-way type that cannot be reversed or a structure with two capstans for normal driving and reverse driving may also be used. It goes without saying that the present invention is applicable as long as the head unit is configured to insert the capstan into the guide hole.

Furthermore, the shape of the bearing is not limited to the shape of the above embodiment.

[Effects of the Invention] As explained above, in the cassette tape player of the present invention, since the bearing of the capstan is shaped to have a position guiding function with respect to the guide hole of the cassette, it is difficult to guide the capstan. Even if the capstan is inserted into the hole, there is an effect that the loaded cassette can be stably fixed in position by the bearing, and therefore, a structure in which the capstan is inserted into the guide hole is put into practical use. It has the effect of being able to

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are conceptual diagrams showing the positional relationship between the head unit and the loaded cassette of a playback-only machine and a recording/playback machine that are embodiments of the present invention, and FIGS. 2(a) and 2(b) )(c)
(d) is an explanatory diagram of the configuration and operation of the drive transmission system in the embodiment shown in Fig. 1 (a), and Figs. 3 (a) and (b) show the head device section in the embodiment shown in Fig. 1 (a). Plan view and side view, Figures 4(a)(b)(c)
) is an explanatory diagram of the operation of the pinch roller of the head device section in FIG. 3; FIGS. 5(a), (b), and (c) are explanatory diagrams of the operation of the magnetic head of the head device section of FIG. 3; FIG. 6 (a) and (b) are explanatory diagrams of the positional relationship between the head device section and the loaded cassette in Figure 3, Figure 7 is an explanatory diagram of the positional relationship between the bearing and the guide hole, and Figure 8 is a perspective view of the cassette. FIGS. 9(a) to 9(d) are explanatory diagrams of the positional relationship between the conventional head unit and the cassette, and FIGS. 10(a) and (b) are explanatory diagrams of the cassette guide function by the guide protrusion. 1 is a window for the magnetic head, 2a and 2b are windows 2 for the pinch roller.
a, 2b, 3a, 3b are capstan holes 3a, 3a,
4a, 4b are small windows, 5a, 5b are guide holes 5a, 5b,
6 is a pad, 21N is a normal head, 21R is a reverse head, 22 is a pinch roller, 23 is a capstan,
24 is a pad, 25N and 25R are erasing heads, 26 is a guide protrusion, 30 is a motor section, 31 is a belt, 32 is a flywheel, 33 is a bearing, 34 is a reduction gear, 35 is a letter 1 lever, 42 is an NR lever, 47 is a crimping lever, 48N
, 48R is a spatula lever, 52 is a pinch lever, and 54 is a pad lever. Forward (normal) Fig. 1 Reverse running - (normal) Fig. 7 Compact cassette tape Fig. 8 Procedure correction (I (voluntary) January 8, 1991

Claims (1)

[Claims] The head unit is configured such that the capstan is inserted through the guide hole of the compact cassette tape, and the bearing of the capstan has a shape that allows positioning of the compact cassette tape when inserted into the guide hole. A cassette tape player characterized by: