JPH04177656A - Cassette tape recorder - Google Patents

Abstract

PURPOSE:To enable cancellation of a locked state by a simple construction wherein a worm gear shaft driving an automatic mechanism for setting a cassette tape and a motor shaft are coupled with a play provided. CONSTITUTION:The shaft of a worm gear 6 driving an automatic mechanism for setting a cassette tape and the shaft of a motor 5 are coupled with a play provided by a coupler 7, and when an excessive torque is given to the gear 6, the gear 6 is moved and locked. When the motor 5 is rotated reversely, the gear 6 is moved in the reverse direction and this locking is canceled. Thus, a locked state of the automatic mechanism for setting the tape is canceled by a simple construction making a complicated clutch and others unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a cassette tape recorder that can automatically load a cassette tape.

(B) Prior art In recent years, the functions of cassette tape recorders have been enhanced, and cassette tapes can be automatically loaded, for example, as disclosed in Japanese Patent Laid-Open No. 175056/1983.

By the way, automatic loading of a cassette tape requires a very large driving force, and when a small motor is used to downsize the entire device, a worm gear that can generate a large driving force is used.

(C) Problems to be Solved by the Invention However, when a worm gear is used, if the driven object exceeds its movable range and cannot be moved, rotational force is stored between the worm gear and the gear meshing with the worm gear.
The meshing force between the teeth exceeded the driving torque of the motor, resulting in a locked condition.

Therefore, in such a configuration, a clutch mechanism is provided, but since the configuration becomes complicated, a configuration that easily solves the above problem has been desired.

(d) Means for Solving the Problems The cassette tape recorder of the present invention includes a mounting mechanism for automatically mounting a cassette tape, and a drive that applies rotational force of a motor to the mounting mechanism via a worm gear as a driving force during automatic mounting. In the mechanism, the shaft of the motor and one shaft of the worm gear are engaged with each other with some play, and the other shaft of the pinion gear is movable in the axial direction of the gear meshing with the worm gear. It is pivoted.

(E) Function The present invention is constructed as described above, and when the mounting mechanism reaches its operating limit and more torque than necessary is applied to the worm gear, the worm gear itself moves, and when the worm gear is reversed, The worm gear returns to its original state and the locked state can be avoided.

(f) Example Embodiments of the present invention will be described based on the drawings.

In Figures 1 and 2, (1) is the chassis, (2)
is a control member storage section provided at the upper part of the negative side of the chassis (1). (3) is a cassette storage case, for example, as disclosed in Japanese Patent Publication No. 47-49010, when a cassette is sucked in, the case moves downward and the cassette is mounted on a reel. (4) is a motor for automatically loading the cassette and switching the running direction of the tape, and is fixed to the chassis (1) with a mounting bracket (5).

(6) connects one shaft to the motor (
4), and the other shaft is pivotally supported in a through hole (9) of a support plate (8) provided on the mounting bracket (5). The through hole (9) of this support plate (8) is formed to be elongated in the vertical direction as shown in FIG.

As shown in FIGS. 3 and 5, the combined body (7) consists of a convex portion (10), a concave portion (11), and a rubber tube (12) wrapped around the convex portion (10). , this rubber tube (12)
A small amount of play is allowed between the convex part (10) and the concave part (11) around which the material is wound. Therefore, the worm gear (6) comes to move slightly in the vertical direction, and the convex portion (10)
The contact between the two is due to the play between the rubber tube (12) and the recess (11).
) to prevent impact noise from occurring. Note that one shaft of the worm gear (6) is attached to the mounting bracket (5).
) is connected to the combined body (7) via a thrust prevention plate (13) provided on the main body. This thrust prevention plate (13)
This prevents the thrust by the worm gear (6) from being applied to the shaft of the motor (4).

Again, in FIGS. 1 and 2, (14) is a transmission gear that meshes with the worm gear (6), (15) is a first gear that is integrally provided with the transmission gear (14), and (16) is the first gear that meshes with the worm gear (6). A second gear (17) meshing with the gear (15) is a third gear integrally provided with the second gear (16).

(18) is a cassette mounting plate rotatably provided on the shafts of the second and third gears (16) and (17), and the tip thereof is a slide plate provided in the cassette storage case (3) for sucking in the cassette. (not shown), and the slide plate is moved by rotation. Further, a pin (19) is provided on the lower surface of the cassette mounting plate (18).

(2o) is a planetary gear that meshes with the third gear (17), and is supported by a rotary plate (21) coaxially provided with the second and third gears (16, 17). ) and rotates around the third gear (17). Further, the shaft (22) of the planetary gear (20) is engaged with the regulation plate (25) through the through hole (24) of the bottom plate (23) of the control member housing (2). This regulating plate (25) is inserted through the pins (28) (29) through the through holes (26) (27) as shown in FIG.
) protrudes into the control member storage portion (2). The respective through holes (24, 26, and 27) are sized to allow rotation of the planetary gear (20) and movement of the regulation plate (25) accompanying the rotation of the planetary gear (20). is formed.

(30) is one side plate (3) of the control member storage section (2).
1), which is a first rack gear fixed to a first control plate (32) that is movable along ing. The first control plate (32) includes a vertical plate (34) and a flat plate (35).
), and this vertical plate (34) has a moving hole (34) that engages with a pin (36) fixed to the side plate (31).
37) is provided, and the 1117th board (32) is provided with a moving hole (
37), and is provided with a lock-shaped support hole (39) that engages with a pin (38) provided in the cassette storage case (3). ) will control the vertical movement. Also,
The flat plate (35) of the first control plate (32) has the second
．． An escape hole (40) for letting the three gears (16, 17) escape, and a lock-shaped guide hole (41) that engages with the pin (19) of the cassette mounting plate (18) are provided. (42) is a second rack gear fixed to a second control plate (44) that is movable along the other side plate (43) of the control member storage part (2), and is attached to the lower surface of the second rack gear of the second control plate (44). pin (29)
A lock-shaped groove (45) is provided for inserting the. The second control plate (44) has a movement hole (46) provided in the side plate (43).
) is engaged with a pin (47) to move along this movement hole (46), and the tip is engaged with a switch (48) that detects the movement state of this second control plate (44). . The second control plate (44) is connected to the switching plate (49) shown in FIG. 10(b) (the connecting part is not shown), and its movement rotates the switching plate (49). I have to.

Here, the tape drive system will be explained based on FIG. 10(b). (50) is a drive gear that is constantly rotated by a motor (not shown), (51) and (52) are reel gears, (
53) is a first transmission gear that meshes with the drive gear (50), and (54) is a second transmission gear that is integrally provided with the first transmission gear (53).
A transmission gear, (55) is a third transmission gear that meshes with the first transmission gear (53), and (56) is a third transmission gear (55) that meshes with the first transmission gear (53).
) is the fourth transmission gear provided integrally with the. (57) (58
) are a first switching gear and a second switching gear rotatably provided on the switching plate (49), both of which are connected via a slip mechanism.

Therefore, the first switching gear (57) is connected to one reel gear (5
1), the second switching gear (58) is the fourth transmission gear (56)
(Fig. 10(b)), the switching plate (41
) rotates, the first switching gear (57) meshes with the other reel gear (52), and the second switching gear (58) meshes with the second transmission gear (54) (FIG. 11(b)).

Next, the operation in the above configuration will be explained.

When no cassette is inserted, Fig. 7(a) (
b), the planetary gear (20) meshes with the first rack gear (30), and the cassette storage case (3)
) is located above. In this state, when a switch (not shown) detects insertion of the cassette, the motor (4)
rotates and transmits the transmission gear (14) via the worm gear (6).
) gives rotational force to In this state, the third gear (17)
is rotated counterclockwise in the state shown in Fig. 7(a), and the first rack gear (30) is rotated in the state shown in Fig. 7(a) via the planetary gear (20).
) to the right. Furthermore, the third gear (17)
By rotating counterclockwise, the planetary gear (20)
tries to move away from the first rack gear (30), but its movement is restricted because the pin (28) of the regulating plate (25) is within the groove (33) of the first rack gear (30). become. When the first rack gear (30) moves, the guide hole (41) of the first control board (32) pushes the pin (19) of the cassette mounting plate (18) to rotate the cassette mounting plate (18) and automatically load the cassette. You will be inhaling it.

The movement of the first rack gear (30) progresses, and as shown in Fig. 8(a) (
When state b) is reached, the cassette mounting plate (18) has finished sucking the cassette, and the pin (19) of the cassette mounting plate (18) is aligned with the guide hole (41) of the first control board (32). and becomes free, and the first control board (3
Even if 2) is moved any further, there will be no change in the cassette mounting plate (18). Even in this state, the cassette storage case (3
) is in the state shown in FIG. 8(b), and the cassette storage case (3) is held in the upper position.

As the first rack gear (30) continues to move further and reaches the limit of movement of the first control plate (32), as shown in FIGS. 9(a) and (b), the pin (38) of the cassette storage case (3) That is, the cassette storage case (3) is connected to the first control board (32).
The cassette is moved downward according to the support hole (39), and the cassette is mounted on the reel shaft. In this state, the pin (28) of the regulation plate (25) is in a free position relative to the groove (33) of the first rack gear (30), and the third gear (17) is further rotated counterclockwise. When the planetary gear (20
) rotates counterclockwise and meshes with the second rack gear (42) as shown in FIG. 10(a). In this state, the first switching gear (57) is meshed with one of the reel gears (51) as shown in FIG. 10(b).

When the third gear (17) further rotates counterclockwise, the second rack gear (42) is rotated via the planetary gear (20).
is moved to the left in FIG. 10(a). When the movement of the second rack gear (42) progresses and the movement limit of the second control plate (44) is reached, the state shown in FIGS. 11(a) and 11(b) is reached. In this state, the first switching gear (57) meshes with the other reel gear (52), and the running direction of the tape is reversed. In addition, the switch (48) is also
It is switched by the control board (44) and notifies a control circuit (not shown) that controls the motor (4) etc. that the running direction has been switched.

By the way, when the state shown in Fig. 11 (a) and (b) is reached,
Since the second rack gear (42) does not move any further, the rotation of the worm gear (6) is forcibly stopped. Even in this state, when the rotational force of the motor (4) is further applied to the worm gear (6), the worm gear (6) moves upward or downward depending on the direction of rotation. Even in this state of movement, the worm gear (6) and transmission gear (14) are in mesh with each other, and a lock condition may occur between them. However, when the motor (4) is reversed, the worm gear (6) Transmission gear (1
4) causes the worm gear (6) to return to its original position, and the locked state between the two is released.

Next, when switching the running direction of the tape from the state shown in FIGS. 11(a) and 11(b), the second rack gear (42) is rotated clockwise by rotating the third gear (17). ), move it to the right in Figure 10 (
This can be done by shifting to the states a) and (b). Note that as the third gear (17) rotates clockwise, the planetary gear (20) tries to move away from the second rack gear (42), but the pin (29) of the regulation plate (25) Since it engages with the groove (45) of (42), its movement is restricted. However, the 10th
When the state shown in Figures (a) and (b) is reached, the pin (29) becomes free from the groove (45) of the second rack gear (42), and if the third gear (17) further rotates clockwise, The planet gear (20) will mesh with the first rack gear (30). Therefore, if the third gear (17) is further rotated clockwise, Fig. 9(a), (b), Fig. 8(a)
(b) Then transition to the state shown in Fig. 7 (a) and (b),
It will be possible to discharge skeins and soto. Even when the cassette is ejected, the worm gear (6) is likely to become locked, but this locking can be avoided in the same way as described above.

With the above configuration, the cassette can be automatically loaded and the tape running direction can be switched automatically using a single drive source, making it possible to realize miniaturization and cost reduction of the apparatus.

In the above configuration, the magnetic head (not shown) is generally moved to the playback position using the force of a reel driving motor, and the first switching gear (5
If 7) is engaged with the reel gears (51) and (52), the tape will be fed before the head comes into contact with the tape, so the following configuration is preferable.

In other words, an additional contact is added to the switch (48) between the contacts that detect the running direction (3-contact switch), and the second rack gear (42) is moved until that contact closes, regardless of the state. (Naturally, in this state, the first switching gear (57) is free), and if this is detected, the reel drive motor is activated, and then the second rack gear (42) is activated so that the desired running direction is achieved. Just move it. This causes the reel to rotate after the head contacts the tape.

In addition, when detecting the end of the tape with the above configuration, -
A disc with alternating white and black discs is attached to the back of both reels, and a photocoupler is installed near the disc. If there is no change in the output from this photocoupler, it is determined that the tape is at the end. ing. However, in this case,
The above-mentioned member must be installed on both reels (in order to detect the state of the winding side in either direction of travel), which increases the number of parts, and the first switching gear (
57) may be detected by the above member. However, when the end of the tape is reached, the first switching gear (57) is structurally prone to swing (because the rotational force of the second switching gear (58) is transmitted via the slip mechanism), and for example, If the photocoupler detects a period between and black, the output of the photocoupler will change at a constant cycle, and the end of the tape may not be determined. Therefore, in this case, it is preferable that the control circuit detects the frequency of the output of the photocoupler and uses this to determine the end of the tape (
Naturally, the frequency is different when the reels are rotating and in the above state)
.

(G) Effects of the Invention In the present invention, when the operating limit of the mounting mechanism is reached as described above and more torque than necessary is applied to the worm gear, the worm gear itself moves, and when the worm gear is reversed, the worm gear returns to its original position. This will allow you to return to the state and escape from the locked state.

Therefore, the locked state can be avoided with a simple configuration, and a tape recorder with great practical effects can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main part of the tape recorder of the present invention, and FIG.
The figure is a cross-sectional side view taken along the line A-A' in Figure 1, Figure 3 is a side view of the main part seen from direction B in Figure 1, and Figure 4 is a side view of the main part viewed from direction C in Figure 1. 5 is an exploded perspective view of the combined body, FIG. 6 is a plan view of the main part with only the regulating plate left, and FIG. 7(a) is a side view of the main part. A plan view of the main part for explanation, Fig. 7 (b
) is a side view of the main part of the first control board in the state of FIG. 7(a),
FIG. 8(a) is a plan view of the main part for explaining the operation, and FIG. 8(b) is a side view of the main part of the first control board in the state shown in FIG. 8(a). 9(a) is a plan view of the main part for explaining the operation, FIG. 9(b) is a side view of the main part of the first control board in the state shown in FIG. 9(a), and FIG.
Figure (a) is a plan view of the main part for explaining the operation,
FIG. 10(b) is an explanatory diagram of the operation of the reel drive system in the state of FIG. 10(a), and FIG. 11(a) is a plan view of the main part for explaining the operation. 11(b) is an explanatory diagram of the operation of the reel drive system in the state shown in FIG. 11(a). (4)...Motor, (6)...Worm gear, (7)
... combined body, (9) ... through hole. Applicant Sanyo Electric Co., Ltd. 1 other agent Patent attorney Takuji Nishino (2 others) 1^
r tn Figure 3 Figure 5 Figure 6 z'-j 2725 1t (I)) Figure 10 Figure 11 Light

Claims (1)

[Claims] (1) A device having a mounting mechanism for automatically mounting a cassette tape, and a drive mechanism that applies rotational force of a motor to the mounting mechanism via a worm gear as a driving force during automatic mounting, wherein one of the shaft of the motor and the worm gear A cassette tape recorder characterized in that the shafts of the pinion gear are engaged with each other with play, and the other shaft of the pinion gear is supported so as to be movable in the axial direction of the gear meshing with the worm gear.