JP2511161B2 - Auto-river type tape player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an auto-reverse type tape player mainly using a battery as a power source.

<Outline of the Invention> According to the present invention, a play mode is selected by detecting a mode selection position based on the elapsed time after the activation of the cam body and changing the positional relationship between the cam body and the lever member at the mode selection position. In this configuration, the mode selection position is accurately detected and the certainty of the selection operation is increased.

<Prior Art> Conventionally, a tape player of this type has a cam body that rotates using a motor as a drive source, a cam body that is operated by the cam body to perform mode switching, and a mode selection position during rotation of the cam body. A lever member capable of changing the positional relationship with the cam body, a driving means for displacing the lever member so as to change the positional relationship between the cam body and the lever member, and an elapsed time after activation of the cam body for a preset reference time. Position detection means for detecting the mode selection position by reaching the position, and a control means for operating the drive means when a mode selection position detection signal is input from the selection position detection means and there is a signal input based on a play mode switching command. And a play mode according to the positional relationship between the cam body and the lever member is set by rotation of the cam body after the mode selection position. Has been established.

<Problems to be Solved by the Invention> By the way, in the above-mentioned conventional device, the time required for the cam body to rotate from the starting position to the mode selection position by the motor under the reference voltage is obtained, and this time is determined as the reference time. Therefore, for example, in a tape player in which a battery is used as a power source and the rotation speed of the motor changes depending on the supplied voltage, the accuracy in detecting the mode selection position is lacking, and the timing of switching the positional relationship between the cam body and the lever member is insufficient. However, there is a problem in that a reliable and stable play mode switching operation cannot be obtained.

Although such a problem can be improved to some extent by providing the above switching timing with a certain range, there is a limit to the range of the timing that can be provided, and it cannot be said to be a very good one. If the usage range is set narrow, a new problem arises that the usage time of the battery is shortened.

<Means for Solving the Problems> The present invention has been made for the purpose of solving the above problems, and the mode selection position detecting means is configured to sequentially correct the reference time according to the change in the rotation speed of the motor. .

<Operation> With the above configuration, the reference time is sequentially corrected according to the change in the rotation speed of the motor. Therefore, the mode selection position is always accurately detected, and the positional relationship between the cam body and the lever member is timed. By switching, the mode selection operation can be performed reliably and stably.

<Example> A headphone stereo cassette tape player will be described below as an example of the present invention, and will be described in detail with reference to the drawings.

1 to 7 are plan views showing each mode of the tape running mechanism of the headphone stereo cassette tape player in the embodiment of the present invention, and FIGS. 8 to 11 are assembly perspective views of the same tape running mechanism.

1 to 11, the main chassis 1 has a take-up reel stand and a supply reel stand arranged on the tape cassette carry-in (front side) side, and the reel shafts of the take-up reel stand and the supply reel stand are projected to the back side and taken up at respective end portions. It has a gear 2 and a supply gear 3. Further, a forward (hereinafter abbreviated as FWD) side capstan shaft 4 and a reverse (hereinafter abbreviated as REV) side capstan shaft 5 project from the front surface side of the main chassis 1, and on the back surface side of each of these capstan shafts 4,5. The FWD side flywheel 6 and the REV side flywheel 7 are fixed to the projecting end.
Both of the above flywheels 6 and 7 have pulleys 6a and 7a, and further F
The WD side flywheel 6 has a gear 6b.

FWD side pinch roller 8 on the front side of the main chassis 1.
Also, the REV side pinch roller 9 and the sub-chassis 11 on which the magnetic head 10 is mounted are arranged. Both pinch rollers 8,
9 is rotatably supported by one end of pinch levers 8a, 9a, and the other ends of the pinch levers 8a, 9a are rotatably supported by shafts 8b, 9b, and the pinch rollers 8, 9 are respectively supported by springs 8c, 9c. It is always held at a position separated from the capstan shafts 4 and 5.

One end of the sub-chassis 11 is rotatably supported by a shaft 8b, and a spring (not shown) always holds the magnetic head 10 at a position separated from the tape surface.

The main chassis 1 rotatably supports a FWD idler gear 12, a REV idler gear 13, and a REV idler connecting gear 14, and the FWD idler gear 12 is attached to the take-up gear 2 and the REV idler gear 12.
Idler gear 13 is supply gear 3 and REV idler connecting gear 1
They are in mesh with each other.

The play gear lever 15 is rotatably supported by the main chassis 1 about the shaft 1a as a rotation center, and the play gear lever 15 is appropriately positioned at the shaft 15a.
Holds the play gear 16 rotatably.

Thus, the play gear lever 15 rotates about the shaft 1a to rotate the play gear 16 into the FWD idler gear 12 in the FWD play position, and the REV idler connecting gear 14 into RE.
It has a V play position and a neutral position that does not mesh with any of them, and these play gear lever 15, play gear 16 and the like constitute a first swing mechanism. The fast-forward gear lever 17 is rotatably supported by the main chassis 1 about a shaft 1a as a rotation center, and the free end thereof rotatably supports a shaft 18 to which fast-forward gears 18a and 18b having the same diameter are fixed at both ends. One fast-forward gear 18a due to rotation around 1a
Has a FF position that meshes with the FWD idler gear 12, a REW position that meshes with the REV idler gear 13, and a neutral position that does not mesh with any of them, and constitutes the second swing mechanism together with the fast-forward gears 18a, 18b, etc. .

The slip gear 19 is a two-stage gear that is rotatably instructed in the main chassis 1 about the shaft 1a as a center of rotation. The large-diameter gear 19a meshes with the other fast-forward gear 18b, and the small-diameter gear 19b meshes with the play gear 16. .

The above REV idler gear 13 and REV idler connecting gear
The gear holding plate 14 is supported by the gear holding plate 20. The gear holding plate 20 is attached to the main chassis 1 and is omitted for the sake of convenience in each of the drawings other than FIGS. 8 to 11.

Both the drive transmission gear 21 and the drive conversion gear 22 are rotatably supported by the main chassis 1, and the drive transmission gear 21 meshes with the gear 6b and the large diameter gear 22a of the drive conversion gear 22. The drive conversion gear 22 is a two-stage gear, and one small diameter gear 22b meshes with the large diameter gear 19a of the slip gear 19.

The cam drive gear 23 is a two-stage gear rotatably supported by the main chassis 1. The large-diameter gear 23a is meshed with the large-diameter gear 19a of the slip gear 19, and the small-diameter gear 23b is connected to the PAD cam described later. It meshes with gears.

The PAD cam 24 is rotatably supported by the main chassis 1 about a shaft 1b as a center of rotation, and has a gear 24a on its outer periphery. The cam portion 24b and the lock pieces 24c and 24d are provided on one surface and the other surface is provided on the other surface. The grooved cam portions 24e are formed respectively. The gear 24a of the PAD cam 24 has toothless portions 24f and 24g at appropriate positions.

The motor 25 is a brushless and coreless motor capable of rotating in the forward and reverse directions. The motor 25 is attached to the main chassis 1 and has a belt 27 between the motor pulley 25a and the intermediate pulley 26 and the pulleys 6a and 7a of the flywheels 6 and 7. I am hanging.

The sub operation lever 28 is movable in the directions of arrows A and B within the range of the long holes 28a and 28b by inserting the long holes 28a and 28b into the shafts 1c and 1d planted on the gear pressing plate 20 and the main chassis 1. And is constantly urged in the direction of arrow B by a spring 29.

Further, the sub-operation lever 28 has a pin 28c standing upright at an appropriate position, and by engaging the pin 28c with the cam portion 24e of the PAD cam 24, the action of the rotating cam portion 24e of the PAD cam 24 causes the arrow A, It is moved in the B direction. Further, the sub-operation lever 28 has a pressing piece 28f formed upright on a part thereof, and the pressing piece 28f is brought into contact with the hitting piece 11a of the sub-chassis 11, and as the sub-operation lever 28 moves in the direction of arrow A. Move the sub-chassis 11 forward against the spring and move the magnetic head 10
Is brought into contact with the tape surface, and functions as a head moving mechanism.

The sub-operation lever 28 has a switch operation piece 28h,
When moved in the direction of arrow A, the switch operation piece 28h turns on a play mode detection switch (not shown).

The pinch roller operation lever 30 is configured by inserting the bent pieces 30a and 30b into the cutouts 28d and 28e of the sub operation lever 28.
The sub operation lever 28 makes an integral movement in the directions of arrows A and B, and can move in the directions of arrows C and D within the range of notches 28d and 28e.

The pinch roller operating lever 30 forms pinch roller operating pieces 30c and 30d. When the pinch roller operating lever 30 moves in the arrow C direction, the pinch roller operating piece 30c is moved to the operating spring 8d of the FWD side pinch roller 8 in the arrow D direction. When pinch roller operation piece
30d faces the operating spring 9d of the REV side pinch roller 9. Thus, the pinch roller operation lever 30 has an arrow A
When it moves in the direction, the operation spring 8d (9d) is operated by the pinch roller operation piece 30c (30d) to press the pinch roller 8 (9) against the capstan shaft 4 (5).

Here, the play gear lever 15 and the fast-forward gear lever 18
The relationship between the sub operation lever 28 and the pinch roller operation lever 30 will be described. The play gear lever 15 has abutting pieces 15b, 15c projecting from the left and right sides, and a part having a substantially pentagonal hole 15d and a slit 15e continuous with the hole 15d. On the other hand, the pinch roller operation lever 30 includes a bending piece 30f facing the contact piece 15b when the lever 30 moves in the arrow C direction and a bending piece 30f facing the contact piece 15c when moving in the arrow D direction. 30g piece of music
To form. When the pinch roller operation lever 30 moves in the direction of arrow A, the bent piece 30f (30g) pushes the contact piece 15b (15c) to rotate the play gear lever 15 and the clockwise (counterclockwise) direction. It works. Also, the sub operation lever
Numeral 28 forms a bent piece 28g, and this bent piece 28g is loosely fitted in the hole 15d of the play gear lever 15, and this bent piece 28g is a sub-operation lever.
When 28 moves in the direction of the arrow B, the play gear lever 15 is returned to the neutral position and rotated by holding the play gear lever 15 in the slit 15e.

The play gear lever 15 forms a projection piece 15h having switch operation pieces 15f and 15g.When the play gear lever 15 rotates clockwise, the switch operation piece 15f causes the switch gear 15g to rotate the FWD. Operate the REV detection switch (not shown).

A contact piece 17c is provided on the fast-forward gear lever 17 so as to face the bent piece 30f of the pinch roller operation lever 30, and the contact piece 17c is folded when the pinch roller operation lever 30 is in the position moved in the direction of arrow A. The contact between the bending piece 30f and the contact piece 17c functions as a blocking mechanism that blocks the fast-forward gear lever 17 from rotating counterclockwise from the neutral position to mesh the fast-forward gear 18a with the FWD idler gear 12.

The solenoid lever 31 is rotatably supported by the shaft 1c and forms arm portions 31a to 31d extending in all directions. Solenoid lever
The reference numeral 31 is formed by bending a portion having the arm portions 31a to 31c and a portion having the arm portion 31d in a U-shape so as to be positioned so as to be displaced in the axial direction, and a spring 32 is provided between the arm portion 15a and the main chassis 1. By being stretched, it is always urged clockwise around the shaft 1c.

The arm part 31b is a solenoid 3 mounted on the main chassis 1.
3 is connected to the iron core 33a. Solenoid 33 is self-holding
When not energized, the built-in permanent magnet overcomes the biasing force of the spring 32 to attract and hold the iron core 33a. When energized, the solenoid 33 generates a magnetic force in a direction opposite to the attracting direction of the permanent magnet, and the resultant force of the magnetic force and the urging force of the spring 32 overcomes the attracting force of the permanent magnet to rotate the solenoid lever 31 clockwise. The iron core 33a projects away from the permanent magnet. It should be noted that, when the iron core 33a is separated by a predetermined distance, the permanent magnet does not attract the iron core 33a even when the power supply to the solenoid 33 is cut off.

Next, the arm portion 31c is linked with the fast-forward locking lever 34. The fast-forward locking lever 34 is the shaft 1e planted on the main chassis 1.
A locking piece 34a is formed at one end and a bending piece 34b is formed at the other end. Thus, the fast-forward locking lever 34 supports the torsion spring 35, and the bent piece 34b and the upright piece 31e at the tip of the arm portion 31c of the solenoid lever 31 are positioned between both ends of the torsion spring 35. It rotates in conjunction with the solenoid lever 31 via 35. The locking piece 34a is engaged with and disengaged from the T-shaped left side piece 17a at the tip of the fast-forwarding gear lever 17 by the rotation of the fast-forwarding locking lever 34.

The T-shaped right side piece 17b prevents the locking piece 34a of the rapid feed locking lever 34 from entering the right side (in the drawing) of the rapid feed gear lever 17.

A pin 31f is erected on the arm portion 31d of the solenoid lever 31,
Connect this pin 31f to the cam portion 24b of the PAD cam 24 and the lock pieces 24c, 2
Related to 4d.

Similar to the solenoid lever 31, the select lever 36 is rotatably supported by the shaft 1c, and the spring 37 stretched between the spring locking piece 36a and the arm portion 31a of the solenoid lever 31 always keeps the shaft 1c. It is biased counterclockwise in the center.

Further, the select lever 36 is provided with a pin 36h standing upright at an appropriate position, and the pin 36b is loosely fitted in a substantially parallelogrammatic hole 31g formed in the solenoid lever 31, and the pin 36h is provided on the left side edge of the hole 31g.
The state in which b is pressed by the urging force of the spring 37 is present.
Therefore, the solenoid lever 31 and the select lever 36 are in a relationship of being integrally rotatable about the shaft 1c by the spring 37.

Further, the select lever 36 has another pin 36c standing on the surface opposite to the pin 36b.
6c is a guide hole 30e formed in the pinch roller operation lever 30
The pinch roller operating lever 30 acts to move in the directions of arrows C and D by the rotation of the select lever 36.

Thus, the PAD cam 24, the motor 25, the solenoid lever 31, the solenoid 33, the select lever 36, etc. constitute a mechanism drive mechanism for switching each part, and the fast-forward locking lever 34, the torsion spring 35, etc. are fast-forward gear levers. Lock 17 and rotate lever 17 in the counterclockwise direction
A locking mechanism that prevents movement to the FF position is configured.

Further, the sub operation lever 28, the pinch roller operation lever 30 and the like constitute a mode switching mechanism which is switched by the mechanism driving mechanism and performs mode switching such as play, fast forward and rewind.

12 to 16 are operation explanatory views showing the operation states of the respective parts centering on the movement of the PAD cam.

FIG. 17 is a schematic plan view showing the positional relationship of the printed circuit board, the motor, the PAD cam, etc., and FIG. 18 is a sectional view taken along the line AA ′ of FIG.

In FIG. 17 and FIG. 18, 38 is a main frame that constitutes the outer shell of the player main body together with the main chassis 1, cabinet 40, etc., 39 is a control circuit board section 39a and a drive board section 39b.
Is a printed circuit board integrally formed by a single board via a narrow connecting portion 39c.
Attach necessary electrical components 39d on both front and back sides. As is apparent from FIG. 18, the printed circuit board 39 has a control circuit board portion 39a and a drive substrate portion 39b mounted at different heights due to the bending of the connecting portion 39c. This is because the maximum height of the electric component 39d mounted on the control circuit board portion 39a and the height of the motor 25 and the solenoid 33 mounted on the drive board portion 39b are different, and both board portions 39a, 39b are mounted at the same height. In this case, the thickness of the player body will increase,
By making the heights different, the player main body is made thinner.

In such a situation, in the present embodiment, the PAD cam 24 is arranged in the vicinity of the motor 25 and the solenoid 33, so that the outer contour of the player main body is further reduced. The reason will be described below.

Since the PAD cam has conventionally been arranged at the position indicated by the reference numeral 24 ', it is necessary to delete the portion 39e surrounded by the chain double-dashed line of the printed circuit board 39 because of the arrangement space of the cam.
As a result, the insufficient space for the electric component 39d is provided outside the control circuit board portion 39a (on the side opposite to the tape running mechanism).
As a result, the main body frame 39 becomes larger, which in turn causes the player body to become larger. Therefore, in this embodiment, the PAD cam is connected to the motor 25 and the solenoid 33.
By arranging in the vicinity of the above, the above problems are solved and the player main body is downsized.

In FIG. 18, 2a indicates a take-up reel stand and 2b indicates a supply reel stand.

Next, FIG. 19 is a block diagram showing a control system of the tape player. In FIG. 19, 41 is a control circuit section mainly composed of a microcomputer, 42 is a play switch, 43 is a fast-forward (hereinafter abbreviated as FF) switch, 44 is a rewind (hereinafter abbreviated as REW) switch, and 45 is a stop switch. Yes, the switches 41 to 45 are operated by the play button, FF button, REW button and stop button. 46 is an initial switch which is turned on when the eject button for ejecting the tape cassette is operated, when the headphone or earphone jack is pulled out from the player body, and when the battery power source is removed from the player body, 47 is the sub operation lever 28 Play mode detection switch that detects the play mode by the movement of, and 48 FWD / R that detects the FWD / REV by the movement of the play gear lever 15
An EV detection switch, 49 is a motor voltage detection unit that detects the voltage supplied to the motor 25, and 50 is a rotation detector that detects the rotation of the FWD idler gear 12. This rotation detector 50 is composed of, for example, a photocoupler. On the other hand, the surface of the FWD idler gear 12 is provided with a white and black striped pattern as is well known in the art, and a pulse is periodically generated from the rotation detector 50 when the idler gear 12 rotates. Reference numeral 51 is a solenoid drive circuit, and 52 is a motor drive circuit.

The control of each part by the control circuit unit 41, the signal processing, and the like will be described with reference to the flowcharts shown in FIGS. 20 to 25 when the operation is described.

The operation of the headphone stereo cassette tape player of this embodiment will be described below.

The first stop mode that has been changed from the play mode
There are three modes: a stop mode (shown in FIG. 3), a second stop mode (shown in FIG. 1) shifted from the FF mode, and a third stop mode (shown in FIG. 2) shifted from the REW mode. Note that FIG. 12 omits the fast-forward gear lever 17 and the fast-forward locking lever, and therefore is common to each stop mode.

First stop mode In this mode, as shown in FIGS. 3 and 12, the sub-chassis 11 and the sub-operation lever 28 are moved in the arrow B direction, and the pinch roller operation lever 30 is moved in the arrow D direction. Yes, play gear lever 15 is play gear 16
Is held at the neutral position, and the fast-forward gear lever 18 holds the fast-forward gear 18a at the neutral position by engaging the left side piece 18a with the lock 34a of the fast-forward lock lever 34. In addition, PAD cam 24
The toothless portion 24f faces the small diameter gear 23b of the cam drive gear 23,
Moreover, the pin 31f of the solenoid lever 31 is engaged with the lock piece 24c. Of course, FWD and REV side pinch rollers 8 and 9
Are separated from the capstan shafts 4 and 5.

1st stop mode FWD play mode Now, when you press the play button and turn on the play switch 42,
The control circuit unit 41 confirms that the play switch 42 is ON and stores the fact that the play mode is set in the memory, while reading the play mode control program from the memory and controlling as follows.

In step S1 of the flowchart shown in FIG. 20, the control circuit unit 41 confirms that the play switch 42 is ON, and in step S2, sends a signal to the motor drive circuit 52 to drive the motor 25 in the counterclockwise direction and Start counting T ₁ .

When the motor 25 rotates counterclockwise, its rotational force is transmitted to the slip gear 19 via the belt 27, the gear 6b, the drive transmission gear 21, and the drive conversion gear 22, and the slip gear 19 rotates clockwise. Then, the fast-forward gear lever 17 provided with the fast-forward gear 18b in mesh with the large-diameter gear 19a moves the shaft 15a.
Is rotated clockwise about the rotation center, and with this rotation, the engagement between the left side piece 17a and the locking piece 34a of the fast-forward locking lever 34 is released, and the fast-forward locking lever 34 is rotated by the torsion spring 35.
The shaft 1c is rotated in the clockwise direction by the elastic force of, and the locking piece 34a is retracted to a position where the engagement with the left side piece 17a is avoided.

The time T ₁ is predetermined based on the time required from the start of driving the motor 25 to at least the engagement of the locking piece 34a with the left side piece 17a, and is a very short time.

When it is determined in step S3 that the time T ₁ has elapsed, in step S4, a signal is supplied to the motor drive circuit 52, the motor 25 is rotated in the reverse direction to rotate clockwise, and a signal is supplied to the solenoid drive circuit 51. Solenoid 33
A single pulse is energized to activate this, and counting of time T ₂ is further started.

The solenoid 33 instantaneously generates a magnetic force by energizing with a single pulse. Then, the resultant force of the magnetic force and the urging force of the spring 32 overcomes the attraction force of the permanent magnet built in the solenoid 33, the solenoid lever 31 rotates clockwise around the shaft 1c as a rotation center, and the iron core 33a is projected. Become.
The solenoid 33 is energized momentarily, but the solenoid lever 31 maintains the state of being rotated clockwise by the urging force of the spring 32.

The state immediately after the solenoid 33 is activated is shown in FIGS. 4 and 13, and the solenoid lever 31 causes the pin 31f to be released from the lock piece 24c of the PAD cam 24 by the clockwise rotation and the torsion spring 35 to be released. The fast-forward locking lever 34 is rotated counterclockwise around the shaft 1e via the shaft 1e to return to the original position. Thus, the fast-forwarding locking lever 34 returns to the original position and is engaged with the fast-forwarding lever 17 which rotates counterclockwise around the shaft 15a as the rotation center of the motor 25 in the clockwise direction. , The fast-forward lever 17
Fast forward gear 18a prevents FWD idler gear
It prevents the FF state from meshing with 12.

The lock piece pin 31f escaped from 24c gives a counterclockwise rotational force to the PAD cam 24 acts on the cam surface 24b ₁ of the cam portion 24b. As a result, the PAD cam 24 meshes the gear 24a with the small diameter gear 23b of the cam drive gear 23.

Further, the select lever 36 rotates clockwise around the shaft 1c together with the solenoid lever 31 by the spring 37, thereby acting on the guide hole 30e of the pinch roller operating lever 30 via the pin 36c, and the pinch roller operating lever 30 Is moved in the direction of arrow C.

On the other hand, the clockwise rotational force of the motor 25 is the belt 27, FWD
It is transmitted to the cam drive gear 23 via the gear 6b of the side flywheel 6, the drive transmission gear 21, the drive conversion gear 22, and the slip gear 19 and meshes with the small diameter gear 23b by the clockwise rotation of the cam drive gear 23. Rotate the PAD cam 24 counterclockwise.

By rotating the PAD cam 24 counterclockwise, the cam surface 24b ₂ of the cam portion 24b acts on the pin 31f, and the solenoid lever 31
Rotate counterclockwise about axis 1c, and
Continue until a is attracted to the permanent magnet built in the solenoid 33. Then, as the solenoid lever 31 rotates counterclockwise, the select lever 36 also rotates in the same direction about the shaft 1c, and the pin 36c moves the pinch roller operation lever 30 in the arrow D direction. The state is shown in FIG. 5 and FIG.

FIG. 5 and FIG. 14 show FWD / REV play mode selection positions. In this state, it is decided whether FWD play or REV play is to be performed depending on whether the solenoid 33 is energized with a single pulse. And this timing is step S3
At, the elapsed time after energizing the solenoid 33, that is,
It is designed to be taken according to the above time T ₂ . However, PAD
The time taken for the cam 24 to reach the position shown in FIG. 13 (and FIG. 4) from the position shown in FIG. 5 (and FIG. 14) depends on the rotation speed of the motor 25, and the rotation speed of the motor 25 is Since it depends on the voltage supplied to 25, the time in step S5
Correcting T ₂ . Particularly, in a tape player that uses a battery as a power source, the voltage drops as it is used, so this correction is essential. Therefore, the time T ₂ in step S5
Is corrected according to the flow shown in FIG.

The control circuit section 41 causes the motor voltage detection section 49 to immediately drive the motor 25 after the solenoid 33 is energized with a single pulse in step S4.
Detects a voltage v ₁ which is supplied to the read reference voltage v ₂ which is stored in the memory, the supply voltage v ₁ from the reference voltage v ₂
Is subtracted to obtain the value Δv. Next, this value Δv is multiplied by a constant h to obtain the shortage time t ₁ , and this shortage time t ₁ is added to the reference time t to obtain the value as the time T ₂ .

The reference voltage v ₂ is set to a voltage higher than the voltage supplied to the motor 25 in advance, and the reference time t is set to the position of the PAD cam 24 shown in FIG. 13 when the reference voltage t ₂ is supplied to the motor 25. Set the time required to reach the position shown in Fig. 14 from.
When the rotation speed of the motor 25 and the supply voltage are proportional to each other and the supply voltage v ₁ is lower than the reference voltage v ₂ , the PAD cam 24 is moved from the position shown in FIGS. 4 and 13 at the reference time t. 5
Since it is not possible to reach the positions shown in FIGS. 14 and 15, the constant h is determined by previously calculating the value necessary for obtaining the shortage time t ₁ based on the voltage difference Δv.

In this way, the control circuit unit 41 corrects the time T ₂ in step S5, and when it determines in step S6 that the time T ₂ has elapsed, the previous play mode stored in the memory in step S7 is FWD. Read out play or REV play.

If the previous play mode is FWD play, a signal is given to the solenoid drive circuit 51 to energize the solenoid 33 with a single pulse in step S8.

That is, in this embodiment, the PAD cam 24, which is a cam body that rotates using the motor 25 as a drive source, and the PAD cam 24 that is operated by the cam 24 to perform mode switching,
A solenoid lever (lever member) 31 that can change the positional relationship with the PAD cam 24 at a mode selection position during the rotation of
Solenoid (driving means) 33 for displacing the PAD cam 24 and the solenoid lever 31 so as to change the positional relationship between the lever 31 and the solenoid lever 31.
And a motor voltage detection unit 29 that detects a change in the rotation speed of the motor 24 based on a change in the supply voltage, and further includes a control circuit unit.
41 corrects a preset time based on the value detected by the motor voltage detection unit 29, and outputs a mode selection position detection signal when the elapsed time after activation of the PAD cam 24 reaches the corrected time. And a control means for operating the solenoid 33 when a mode selection detection signal is input from the selected position detection means and a signal (FWD play signal) based on a play mode switching command is input.

In FIG. 14, when the solenoid 33 is energized in a single pulse, the solenoid lever 31 rotates in the clockwise direction to bring its pin 31f into contact with the cam surface 24b ₃ of the cam portion 24b in the counterclockwise direction as described above. Cam surface 2 of PAD cam 24 that keeps rotating
4b ₃ Slide on top. As the solenoid lever 31 rotates, the select lever 36 also rotates clockwise and its pin 36
It acts on the guide hole 36e of the pinch roller operating lever 30 via c and moves the operating lever 30 in the direction of arrow C. still,
The fast-forward locking lever 34 also receives the rotational force in the counterclockwise direction about the shaft 1e and maintains the engagement with the fast-forward lever 17.

On the other hand, the cam portion 24e of the PAD cam 24 acts on the pin 28c of the sub-operation lever 28 in accordance with the counterclockwise rotation of the cam 24 to move the operation lever 28 in the direction of arrow A against the spring 29, The bent piece 28g is to be released from the slit 15e of the play gear lever 15, and along with this movement, the pinch roller operation lever 30 also moves in the same direction and its guide hole 30e.
Then the pin 36c of the select lever 36 escapes.

After the pin 36c is escaped from the guide hole 30e, PAD cam 24 begins to rotate the solenoid lever 31 in the counterclockwise direction through the pin 31f by the cam surface 24b ₄ of the cam portion 24b. At this time, pin 36c
Is out of the guide hole 36c, so select lever 3
6 rotates counterclockwise with the solenoid lever 31 without moving the pinch roller operating lever 30 in the direction of arrow D. Therefore, the pinch roller operation lever 30 is indicated by the arrow C.
It is still moving in the direction. Eventually, the permanent magnet built in the solenoid 33 attracts the iron core 33a by the counterclockwise rotation of the solenoid lever 31. Fast-forward locking lever 3
Although a rotational force in the clockwise direction is applied to 4, the fast-forward locking lever 34 does not rotate in the clockwise direction because it is engaged with the fast-forward lever 17, and the rotational force is absorbed by the torsion spring 35.

During this time, the sub operation lever 28 and the pinch roller operation lever 30 continue to move in the direction of the arrow A, and the sub operation lever 28 presses the hitting piece 11a by its pressing piece 28f to move the sub chassis 11 about the axis 8b. Rotate it counterclockwise to move the magnetic head 10 forward in the direction of arrow A to contact the tape surface (not shown), while the pinch roller operating lever 30 bends the bent piece 30g.
Press the contact piece 15c to move the play gear lever 15 to the shaft 1a.
Rotate counterclockwise around the to engage the play gear 16 with the FWD idler gear 12 and pinch roller operation piece 15
The operation spring 8d is pressed by f to rotate the pinch lever 8a counterclockwise about the shaft 8b, and the FWD side pinch roller 8 is pressed against the FWD side capstan shaft 4 via the magnetic tape.

At this point, the play mode detection switch 47 is turned on, the FWD / REV detection switch 48 is switched to the FWD side by the switch operation piece 15f of the play gear lever 15, and the control circuit unit 41 stores the FWD play. .

By such operation, the tape running mechanism is FWD.
The mode is switched to the play mode, and the state shown in FIGS. 6 and 16 is entered. Then, when the play gear 16 meshes with the FWD idler gear 12, the PAD cam 24 is already stopped by the pin 31f of the solenoid lever 31 engaging with the lock piece 24d to prevent rotation in the counterclockwise direction, and the toothless portion 24g. Cam drive gear 23
Facing the small-diameter gear 23b.

Thus, in this state, the clockwise rotation of the motor 25 causes the belt 27, the gear 6b, the drive transmission gear 21, the drive conversion gear 22,
Slip gear 19, play gear 16 and FWD idler gear 12
The magnetic tape of the tape cassette travels in the FWD direction by the rotation of the FWD side capstan 4 which is transmitted to the take-up gear 2 via the FWD side pinch roller 8 while being pressed.
The fast-forward gear lever 17 contacts the contact piece 17c with the bent piece 30f of the pinch roller operation lever 30 and is rotated clockwise to release the engagement with the fast-forward locking lever 34. Rotation in the counterclockwise direction is blocked by the bent piece 30f of the pinch roller operation lever 30, and the fast-forward gear 18a moves in the FWD
It does not mesh with the idler gear 12, and the shaft 18
Rotate around.

The control circuit unit 41 operates the reproducing circuit in step S9 to read and reproduce the music information recorded on the magnetic tape by the magnetic head 10, and the user can hear the reproduced sound through the earphones or headphones. it can. By the above operation, FWD play, that is, FWD reproduction is executed.

First stop mode REV play mode The control circuit unit 41 controls in the same manner as in steps S1 to S7 described above, and the tape running mechanism during this period also operates in the same manner as described above.

When it is determined in step S7 that the previous play mode is the REV mode, the REV mode is entered. The transition to REV mode is made at the position shown in FIG. 5 and FIG. 14 without energizing the solenoid 33 as in the FWD mode.
This is performed by the AD cam 24 continuing to rotate counterclockwise as it is.

When the PAD cam 24 rotates counterclockwise from the positions shown in FIGS. 5 and 14, the cam portion 24b does not act on the pin 31f and the solenoid lever 31, the select lever 36, and the fast-forward locking lever 34 operate. There is no. Therefore, the pinch roller operation lever 30 maintains the state of moving in the arrow D direction.

On the other hand, the cam portion 24e of the PAD cam 24 acts on the pin 28c of the sub operation lever 28 to move the sub operation lever 28 together with the pinch roller operation lever 30 in the direction of arrow A, thereby bending the bent piece 28g.
The pin 36d of the select lever 36 is made to escape from the guide hole 30e through the slit 15e. Further, when moving in the direction of the arrow A, the pressing piece 28f comes into contact with the sub-chassis via the hitting piece 11a.
11 rotate counterclockwise about axis 8b,
Abut the tape surface. Further, the pinch roller operation piece 30d rotates the pinch lever 9a about the shaft 9b via the operation spring 9d, and presses the REV side pinch lever 9 against the REV side capstan shaft 5 via a tape. Further, the bent piece 30f hits the contact piece 15b of the play gear lever 15 to rotate the play gear lever 15 clockwise around the shaft 1a, and the play gear 16 meshes with the REV idler connecting gear 14.

Eventually, the PAD cam 24 stops by the lock piece 24d engaging the pin 31f, the toothless portion 24g faces the small diameter gear 23b of the cam drive gear 23, and the REV play mode shown in FIG. 7 and FIG. Become. At this time, the play mode detection switch 47 is in the ON state as in the FWD, the FWD / REV detection switch 48 is switched to the REV play side by the switch operation piece 15f of the play gear lever 15, and the control circuit section 41 is Store REV play in memory.

By such operation, the tape running mechanism is REV
The mode is switched to the play mode and the state shown in FIGS. 7 and 15 is entered. When the play gear 16 meshes with the REV idler connecting gear 14, the PAD cam 24 has already locked the lock piece 24.
The pin 31f of the solenoid lever 31 is engaged with d to prevent rotation in the counterclockwise direction and stop.
It faces the small-diameter gear 23b of 3.

Thus, in this state, the clockwise rotation of the motor 25 causes the belt 27, the gear 6b, the drive transmission gear 21, the drive conversion gear 22,
Slip gear 19, play gear 16, REV idler connecting gear 1
4 and the REV idler gear 13 are transmitted to the supply gear 3, and the REV side capstan shaft 5 that is in pressure contact with the REV side pinch roller 9 rotates to RE the magnetic tape of the tape cassette.
Drive in the V direction. For the same reason as in the play mode, the fast-forward gear lever 17 is prevented from rotating counterclockwise, and the fast-forward gear 18a does not mesh with the FWD idler gear 12 and rotates about the shaft 18 at that position.

The control circuit unit 41 operates the reproducing circuit in step S9 to read and reproduce the music information recorded on the magnetic tape by the magnetic head 10, and the user hears the reproduced sound through the earphones or headphones. You can

By the above operation, REV play, that is, REV reproduction is executed.

FWD play mode First stop mode In the FWD play mode, when the stop button is operated and the stop switch 45 is turned on, the control circuit unit 41 confirms that the stop switch 45 is turned on, reads the corresponding control program from the memory, The control is performed as in the flowchart shown in FIG.

When it is determined in step 10 in FIG. 21 that the stop switch 45 is ON, the control circuit unit 41 determines in step 11 in FIG. 22 with the play mode detection switch 47 whether or not the currently executed mode is the play mode.

Now, when the play mode detection switch 47 is ON and it is determined that the play mode is set, in step 12,
The solenoid 33 is energized with a single pulse, and counting of the time T ₃ is started.

The solenoid 33 instantaneously generates a magnetic force by energizing with a single pulse, and as a result, the solenoid lever 31 rotates clockwise about the shaft 1c as described in the preceding paragraph, and the pin 31 rotates.
f is made to escape from the lock piece 24d of the PAD cam 24, and the fast-forward locking lever 34 is pivoted via the torsion spring 35.
It is rotated counterclockwise around 1e and returned to the original position where it can be engaged with the fast-forward lever 17. Furthermore, select lever
36 also rotates in the clockwise direction together with the solenoid lever 31 to move the pin 36c into the guide hole 30e of the pinch roller operation lever 30.
To the opposite position.

The pin 31f acts on the cam surface 24b ₅ of the cam portion 24b to escape from the locking piece 24d, rotates the PAD cam 24 counterclockwise to mesh the gear 24a to the small-diameter gear 23b of the cam drive gear 23. Then, the PAD cam 24 is rotated by receiving the clockwise rotating force of the cam drive gear 23, and the pin 31f is fixed to the cam surface of the cam portion 24b.
24b ₆ Sliding on top.

On the other hand, when the PAD cam 24 rotates in the counterclockwise direction, the cam portion 24e acts on the pin 28c to move the sub-operation lever 28 in the direction of arrow B, and the sub-chassis 11 moves with the movement of the sub-operation lever 28. 8b is rotated clockwise to separate the magnetic head 10 from the magnetic tape, and the bending piece 28g acts on the beveled edge of the hole 15d of the play gear lever 15 so that the lever 1
The play gear 16 is returned to the neutral position by rotating the 5 clockwise about the shaft 1a. The fast-forward gear lever 17 is released from the blocking state by the bent piece 30f, but the left-side piece 17a is engaged with the locking piece 34a of the fast-forward locking lever 34, so the fast-forward gear 8 is neutral. Maintained in position.

Further, since the pinch roller operating lever 30 also moves in the direction of arrow B, the pinch roller operating piece 30c is separated from the operation spring 8d, and the FWD side pinch roller 8 is separated from the FWD side capstan 4 by the urging force of the spring 8c. In addition, the guide hole 30e is located opposite to the pin 36c.

As the PAD cam 24 continues to rotate, the pin 31f will eventually
When it reaches the cam surface 24b _{7 of} b, the solenoid lever 31 begins to rotate counterclockwise under the action of this cam surface 24b ₇ , and finally the iron core 33a is attracted to the permanent magnet built in the solenoid 33, and the pin 31f becomes It engages with the lock piece 24c and has a toothless portion 24f.
Faces the small-diameter gear 23b of the cam drive gear 23. Therefore, P
AD cam 24 is stopped. At this time, solenoid lever
Along with 31, the select lever 36 also rotates, and the pinch roller operating lever 30 is moved in the direction of arrow D by the pin 36c.
This state is the first stop mode shown in FIGS. 3 and 12.

Although the FWD / REV detection switch 48 has returned to the neutral position, the control circuit unit 41 remembers that the play mode this time was the FWD mode.

Here, the time T ₃ will be described. This time T ₃ is set based on the time until the tape running mechanism shifts to the state shown in FIGS. 3 and 12 after energizing the solenoid 33 in step S12.
This is a value for controlling the timing of turning off.
Therefore, the time T ₃ is corrected in the same manner as the time T ₂ described above based on the voltage supplied to the motor 25 to ensure the mechanism state shown in FIGS. 3 and 12. The motor 25 can be turned off, and such correction is performed in step S13. When the control circuit unit 41 determines that the time T ₃ has elapsed in step S14, it gives a signal to the motor drive circuit to stop the motor 25 in step S15.

With the above operation, the FWD play mode is switched to the first stop mode.

REV play mode First stop mode In REV play mode, when the stop button is operated and the stop switch 45 is turned on, the control circuit unit 41 confirms that the switch 45 is turned on and controls each unit according to a predetermined control program. As for the control,
Since it is the same as the case of the "D play mode first stop", the description thereof is omitted here.

In addition, from the operating side of the mechanism, play gear lever 15
Direction of return, the point that the pinch roller separated from the capstan shaft is on the REV side, pinch roller operating lever 30
The operation of the solenoid 33, the PAD cam 24, the solenoid lever 31, etc. is the same as in the case of the "FWD play mode first stop" in the previous stage, except that there is no movement in the direction of arrow D. Although the description thereof is omitted, the state finally shown in FIGS. 3 and 12 is obtained.

First stop mode FF mode Now, when the FF button is pressed to turn on the FF switch 43, the control circuit unit 41 confirms that the FF switch 43 is turned on and stores in the memory that the FF mode has been set. The control program for the mode is read out and controlled as shown in the flowchart of FIG.

The control circuit unit 41 turns on the FF switch 43 in step S1.
Is confirmed, in step S16, the motor drive circuit 5
A signal is given to 2 to rotate the motor 25 counterclockwise, and at the same time, counting of time T ₁ is started.

The control in step S16 is the same as the control in step 2, and the operation of the tape running mechanism during this period is also the same.

Therefore, when it is determined in step S17 that the time T ₁ has elapsed, the fast-forward gear lever 17 rotates clockwise around the shaft 1a in FIG.
The engagement between 34a and the left side piece 17a is released, and the torsion spring 35 rotates clockwise about the shaft 1e.

In the next step S18 in this state, the control circuit unit 41 gives a signal to the motor drive circuit 52 to rotate the motor 25 in the reverse direction to rotate it clockwise. Then, the clockwise rotational force of the motor 25 is transmitted to the slip gear 19 via the motor pulley 25a, the belt 27, the pulley 6a, the gear 6b, the drive transmission gear 21, and the drive conversion gear 22.
Is transmitted to the large-diameter gear 19a by the counterclockwise rotation of the slip gear 19, and the fast-forward gear lever 17 meshing with the fast-forward gear 18b rotates counterclockwise about the shaft 1a.
The fast-forward gear 18a coaxial with the fast-forward gear 18b is meshed with the FWD idler gear 12. The rapid feed gear 18a has a shaft 1 after meshing.
It rotates clockwise around 8 and transmits its rotational force to the winding gear 2 via the FWD idler gear 12.

This state is shown in FIG. 1, in which the take-up reel stand rotates at high speed in the tape winding direction, and the magnetic tape in the tape cassette runs at high speed in the FWD direction.

FF mode 2nd stop mode In this FF mode, when the stop button is pressed to turn on the stop switch 45, the control circuit unit 41 stores in memory the fact that the stop mode has been set by turning on the stop switch 45. Read and control the corresponding program.

After confirming that the stop switch 45 is ON in step S20 of FIG. 20, the control circuit unit 41 proceeds to step S11 of FIG.
At, it is determined whether or not the current mode is the play mode. In this case, since the sub operation lever 28 is still retracted in the direction of arrow B, it is determined that the play mode detection switch 47 is OFF and the play mode is not set, and immediately in step S15, the motor drive circuit 52 is operated. To stop the motor 25.

Therefore, in the second stop mode, only the motor 25 stops as compared with the FF mode, and the states of the respective parts of the tape running mechanism are the same as those in FIG. That is,
The state of FIG. 1 is the FF mode and also shows the second stop mode.

First stop mode REW mode When the REW button is pressed and the REW switch 44 is turned on, the control circuit unit 41 confirms that the REW switch 44 is turned on and stores the fact that the REW mode is set in the memory, while the REW mode is set by the memory. The control program for the mode is read out and controlled as shown in the flowchart of FIG.

The control circuit unit 41 causes the REW switch 44 to turn on in step S1.
If N is confirmed, in step S21 the motor drive circuit 52
To rotate the motor 25 counterclockwise.

Then, the counterclockwise rotational force of the motor 25 is applied to the motor pulley 25a, the gear 6b, the drive transmission gear 21, and the drive conversion gear 22.
Is transmitted to the slip gear 19 via
By the clockwise rotation of, the fast-forward gear lever 17 rotates clockwise around the shaft 1a from the state shown in FIG. 3, and the fast-forward gear 18a meshes with the REV idler gear 13. as a result,
The rotation of the slip gear 19 is transmitted to the supply gear 3 via the rapid feed gears 18b and 18a and the REV idler gear 13.

This state is shown in FIG. 2, in which the supply reel base rotates at a high speed in the counterclockwise direction, that is, the tape winding direction, and the magnetic tape of the tape cassette runs at a high speed in the REW direction, that is, the rewinding direction.

REW Mode Third Stop Mode In this REW mode, when the stop button is pressed to turn on the stop switch 45, the control circuit unit 41 stores in memory the fact that the stop mode has been set by turning on the stop switch 45, while Read and control the corresponding program.

After confirming that the stop switch 45 is ON in step S23 of FIG. 20, the control circuit unit 41 proceeds to step S11 of FIG.
At, it is determined whether or not the current mode is the play mode. In this case, since the sub operation lever 28 is still retracted in the direction of arrow B, it is determined that the play mode detection switch 47 is OFF and the play mode is not set, and immediately in step S15, the motor drive circuit 52 is operated. To stop the motor 25.

Therefore, in the third stop mode, only the motor 25 is stopped as compared with the REW mode, and the states of the respective parts of the tape running mechanism are not different from those in FIG. That is, the state shown in FIG. 2 is the REW mode and the third stop mode.

Play mode FF mode In FWD or REV play mode, when the FF button is pressed to turn on the FF switch 43, the control circuit unit 41 turns on the FF switch 43.
While the FF mode is set in the memory by, the program corresponding to the FF mode is read from the memory and controlled.

When the control circuit unit 41 confirms that the FF switch 43 is ON in step S10 during execution of the FWD or REV play mode, it first controls to return to the first stop mode. That is, as shown in FIG. 21, steps S12 to S in FIG. 22 explained in detail in the section “FWD play mode first stop mode”.
Perform the same control as 14. Of course, the operation of the tape running mechanism during this period is similar.

Therefore, when the control circuit section 41 confirms the elapse of the time T ₃ , each section of the tape running mechanism has switched to the state shown in FIGS. 3 and 12. Then, when the control circuit unit 41 determines that the time T ₃ has elapsed, the control circuit unit 41 next reads “first stop mode”.
The same control as steps S16 to S18 in FIG. 20 described in the section “FF mode” is performed. By this control, the tape running mechanism is switched to the FF mode shown in FIG. 1, and the magnetic tape in the tape cassette is run at high speed in the FF direction, that is, the feeding direction.

With the above operation, the FWD or REV play mode is switched to the FF mode.

Play mode REW mode In FWD or REV play mode, press the REW button to REW
When the switch 44 is turned on, the control circuit section 41 is set to the REW switch 44.
When the REW mode is set by turning on, the memory stores the fact that the REW mode has been set, and at the same time, the corresponding program is read from the memory and controlled.

When the control circuit unit 41 confirms that the REW switch 44 is ON in step S10 during execution of the FWD or REV play mode, it first controls to return to the first stop mode. That is, as shown in FIG. 21, steps S12 to S in FIG. 22 explained in detail in the section “FWD play mode first stop mode”.
Perform the same control as 14. Of course, the operation of the tape running mechanism during this period is similar.

Therefore, when the control circuit section 41 confirms the elapse of the time T ₃ , each section of the tape running mechanism has switched to the state shown in FIGS. 3 and 12. Then, when the control circuit unit 41 determines that the time T ₃ has elapsed, the control circuit unit 41 next reads “first stop mode”.
The same control as step S21 in FIG. 20 described in the section "REW mode" is performed. By this control, the tape running mechanism is switched to the REW mode shown in FIG. 2, and the magnetic tape of the tape cassette is run at high speed in the REW direction, that is, the rewinding direction.

By the above operation, REW from FWD or REV play mode
Switch to mode.

FF or REW mode Play mode In FF or REW mode, when the play button is pressed to turn on the play switch 42, the control circuit unit 41 causes the play switch
When the play mode is set by turning ON 42, the program is stored in the memory and the corresponding program is read from the memory and controlled.

The control circuit unit 41 executes step S20 during execution of the FF or REW mode.
Alternatively, when it is confirmed in step S23 that the play switch 42 is ON, the same control as steps S2 to S9 in FIG. 20 described in detail in the section "First stop mode FWD play mode" is performed. During this time, the tape running mechanism operates in the same manner as described above and shifts to the play mode. However, whether the execution play mode is the FWD play or the REV play is determined by the previous play mode stored in the memory of the control circuit unit 41.

When the motor 25 is rotated counterclockwise in step S2, the fast-forward gear 8a meshes with the REV idler gear 13 as shown in FIG. 2 when the REW mode is switched to the play mode. Even after the operation, the supply reel base is rotated in the rewinding direction, but the counterclockwise rotation of the motor 25 is limited to the time T ₁ which is the extremely short time described above, which is a problem in actual use. There is no such thing.

FF mode REW mode In FF mode, press the REW button to turn on the REW switch 44.
Then, the control circuit unit 41 stores the fact that the REW mode has been set by turning on the REW switch 44 in the memory, and at the same time, reads the corresponding program from the memory and controls it.

When the control circuit unit 41 confirms that the REW switch 44 is ON in step S20 during execution of the FF mode, it switches the rotation direction of the motor 25 from clockwise to counterclockwise as shown in step S21. Then, along with this, the rotation direction of the slip gear 19 is also reversed from the counterclockwise direction to the clockwise direction, and the fast-forward gear lever 17 rotates clockwise around the shaft 1a from the state shown in FIG. 1 to the FWD idler gear 12 until now. The fast-forward gear 8a that has been meshed is separated from the FWD idler gear 12 and meshes with the REV idler gear 13, resulting in the state shown in FIG.
As a result, the rotation of the slip gear 19 is changed by the rapid feed gears 8b, 8a, R
It is transmitted to the supply gear 3 through the EV idler gear 13, the supply reel base rotates in the REW direction, that is, the rewinding direction, and the REW mode is executed.

REW mode FF mode In REW mode, press the FF button to turn on the FF switch 43.
Then, the control circuit unit 41 stores in the memory that the FF mode has been set by turning ON the FF switch 43, and at the same time, reads the program corresponding to the memory from the memory and controls it.

When confirming that the FF switch 43 is ON in step S23 during execution of the REW mode, the control circuit unit 41 switches the rotation direction of the motor 25 from the counterclockwise direction to the clockwise direction as shown in step S18. Then, along with this, the rotation direction of the slip gear 19 also reverses from the clockwise direction to the counterclockwise direction, and the fast-forward gear lever 17 rotates counterclockwise from the state shown in FIG. The fast-forward gear 8a that has been meshed with is separated from the REV idler gear 13 and meshes with the FWD idler gear 12, resulting in the state shown in FIG. As a result, the rotation of the slip gear 19 is changed by the rapid feed gears 8b and 8b.
a, transmitted to the take-up gear 2 via the FWD idler gear 12, the take-up reel stand rotates in the FWD direction, that is, the take-up direction, and the FF mode is executed.

FWD play mode REV play mode Play mode, if the FWD play mode is currently being executed and the play button is pressed to turn on the play switch 42, the control circuit unit 41 confirms that the play direction switching mode has been set by turning on the play switch 42. While storing the program in the memory, the program corresponding to the program is read out from the memory and controlled.

The control circuit unit 41 executes step S10 during execution of the FWD play mode.
When confirming that the play switch 42 is ON, first
Control to return to stop mode. That is, as shown in FIG. 21, "FWD play mode first stop mode"
The same control as steps S12 to S14 in FIG. 22 described in detail in Section 2 is performed. The operation of the tape running mechanism during this period is similar.

Therefore, when the control circuit unit 41 determines that the time T ₃ has elapsed, each unit of the tape running mechanism is switched to the state shown in FIGS. 3 and 12. Then, when the control circuit unit 41 determines that the time T ₃ has elapsed, the control circuit unit 41 next reads “first stop mode”.
The same control as steps S2 to S6 in FIG. 20 described in the section "FWD play mode" will be performed. By this control, the tape running mechanism is shown in Figs.
Switches to the FWD / REV selection position shown in the figure.

Next, when the play mode is set in the stop mode, the previous play mode stored in the memory in step S7 is read out and controlled to be the same as the previous play mode. At the time of setting, the control program is constructed so that the play mode of this time is opposite to the play mode of the previous time.

Therefore, when the control circuit unit 41 determines the elapse of the time T ₂ ,
The previous play mode (FWD play mode in this section) is read and the above determination is performed based on this mode, and as a result, the REV play mode is set.

As a result, the tape running mechanism is shown in Figs.
From the FWD / REV selection position shown in the figure, select “First stop mode”.
As described in detail in the section "REV play mode", it operates to switch to the REV play mode shown in FIGS. 7 and 15, and executes the REV play.

With the above operation, the FWD play mode is switched to the REV play mode.

REV play mode FWD play mode While the REV play mode is being executed, when the play button is pressed to turn on the play switch 42, the control circuit unit 41 stores in the memory that the play direction switching mode has been set by turning on the play switch 42. , Reads the corresponding program from the memory and controls it.

The control circuit unit 41 executes step S10 during execution of the REV play mode.
When you confirm that the play switch 42 is ON,
D play mode REV play mode The same control as that explained in the section is executed, the tape running mechanism is once switched to the first stop mode shown in FIGS. Switch to the FWD / REV selection position shown in the figure.

Next, when the control circuit unit 41 determines that the time T ₂ has elapsed, it reads the previous play mode (REV play mode in this item) and makes a determination based on that mode.
Set the FWD play mode, which is the opposite of the play mode,
By executing the control shown in step S8 of the figure, the tape running mechanism will be described in detail in the section "First stop mode FWD play mode" from the FWD / REV selection position shown in FIGS. 5 and 14. As shown in Figures 6 and 14,
Operates to switch the D play mode and executes FWD play.

With the above operation, the REV play mode is switched to the FWD play mode.

Tape end detection The tape end detection used in the one-cycle mode, endless mode, etc. described later will be briefly described.

The rotation detector 50 used to detect the tape end is FWD, RE
V FWD idler gear 12 that rotates in any play mode
The white and black stripes on the surface of this idler gear
It is a conventionally well-known one that has a light emitting part that irradiates the surface of 12 and a light receiving part that receives the light reflected by the white part, and the reflection of the light by the white part of the FWD idler gear 12 when rotating and the black part The absorption of the light by the above is repeated, and the light receiving section generates a pulse each time the reflected light is received. Control circuit section
When the pulse is no longer generated from the light receiving unit, the reference numeral 41 determines that the rotation has stopped, that is, the magnetic tape has stopped running and has reached the tape end.

In addition, the FWD idler gear 12 is the motor in the REV play mode.
Although the rotational force of 25 is not transmitted, as the magnetic tape is pulled out from the take-up reel of the tape cassette, the reel, the take-up reel stand engaged with the reel, and the take-up gear 2 rotate, FWD in mesh with gear 2
The idler gear 12 also rotates.

Of course, the detection of the tape end is also performed in the FF mode and the REW mode, and the detection of the tape end is controlled to shift to the second stop mode and the third stop mode, respectively.

One-cycle mode This one-cycle mode ends the play mode when the tape end is detected during REV play, as opposed to the endless mode in which FWD play and REV play are repeated repeatedly until the stop switch 45 is turned ON. Say the mode.

This one-cycle mode is automatically set by pressing the play button and turning on the play switch 42. That is, the control circuit unit 41 confirms that the play switch 42 is ON and stores the fact that the play mode has been set in the memory, and at the same time sets the one-cycle mode as shown in FIG.
When the play switch 42 is not turned on again within a predetermined period after the play switch 42 is turned on, control is performed to execute the play in the one cycle mode. When the play switch 42 is turned on again within a predetermined period, the endless mode play described later is executed.

The above-mentioned predetermined period is set to an appropriate time in advance within the time required from when the play switch 42 is first turned on to when the play mode detection switch 47 is turned on. this is,
The tape running mechanism has a play mode detection switch 47
When the play switch 42 is turned on after turning it on, FWD / R
By processing as an EV switching signal.

When the one-cycle mode play is set in this way, as shown in FIG. 24, either the FWD play or the REV play is executed, and during this play mode execution, the control is executed. The circuit unit 41 repeatedly determines whether or not the tape end is reached by a signal from the rotation detector 50, and when it is determined that the tape end is reached,
Next, it is determined whether the current mode is the one cycle mode. In this case, since it is the one-cycle mode, it is next determined whether or not the current play mode is the REV play mode, and if it is determined to be the REV play mode, control is performed to return to the stop mode, and the REV play When not in the mode, each part of the tape running mechanism is controlled to shift to the FWD play mode. In short, in the case of one-cycle mode play, it stops by detecting the tape end of REV play.

The stop control associated with the detection of the tape end of REV play is performed as follows.

First, when the tape end is detected, the same control as that from step S11 to step S14 shown in FIG. 22 is performed, and the tape running mechanism is set to RE shown in FIGS. 7 and 15.
From the state of V play mode, the first shown in FIG. 3 and FIG.
By shifting to the stop mode state and further performing the same control as the control from step S2 to step S9 shown in FIG.
Switch to the FWD play mode shown in the figure. After that, the 22nd
By performing the same control as the control from step S11 to step S15 shown in the figure, the tape running mechanism is shifted to the first stop mode shown in FIGS.

Here, the reason why the tape running mechanism is once shifted to the FWD play mode and then to the stop mode is to improve the usability by always starting from the FWD play mode at the next use.
In other words, when the REV play mode is directly changed to the stop mode, the memory of the control circuit unit 41 stores the previous REV play mode, and when the play button is pressed next time, the REV play mode is performed. There is a disadvantage that the tape end is detected immediately or in a short time to enter the stop mode. Therefore, the FWD play mode is once entered, the FWD / REV detection switch 48 is operated, the memory of the control circuit unit 41 is made to remember that the FWD play mode was the last time, and then the stop mode is restored.

Endless Mode After pressing the play button to turn on the play switch 42, if the play button is pressed again to turn on the play switch 42 within a predetermined period, the endless mode play is set.

As shown in FIG. 24, the control circuit unit 41 shifts from the FWD play mode to the REV play mode or from the REV play mode to the FWD play mode every time the tape end is detected by the signal from the circuit detector 50. To control the FWD play
Repeat the REV play. The above play is continued until the stop switch 45 is turned on by pressing the stop button, and when the stop switch 45 is turned on, the steps S11 to S15 shown in FIG. 22 are controlled to stop in the first stop mode.

In addition, within a predetermined period after the play switch 42 is first turned on, 2
When the play switch 42 is turned on more than once, the second and subsequent ONs may be invalidated, and the one cycle mode and the endless mode may be alternately set each time the play switch 42 is turned on.

Operation by the initial switch While the FWD play, REV play, FF, REW, etc. operation modes are being executed, the eject button is operated to eject the tape cassette, the headphone or earphone jack is unplugged, and the battery power supply When it is removed, the initial switch 46 turns on. Then, the control circuit unit 41 stores ON of the initial switch 46 in the memory and, at the same time, reads out and executes a corresponding control program from the memory.

The control program cannot be executed immediately because the power is cut off when the battery power supply is removed, but the control program is executed next time the battery power supply is attached.

When the control circuit 41 checks the ON initials switch 46, as shown in FIG. 25, to rotate the motor 25 in the clockwise direction and starts counting the time T _4, the after the time T ₄
It will be controlled according to the flowchart shown in FIG.

The time T ₄ is set to be longer than the time for mode switching, which is the longest, so that the initial switch 42 can be turned on at any timing.

For example, when the initial switch 46 is turned on between the time when the play switch 42 is turned on and the FWD / REV selection position shown in FIG. 5 and FIG. It will rotate until ₄ has passed,
It has transitioned to REV play mode due to the passage of time T ₄ ,
Therefore, by performing the control from step S11 to step S15 shown in FIG. 22, the tape running mechanism shifts to the first stop mode and stops.

If the initial switch 46 is turned on before the play mode detection switch 47 is turned on after the tape running mechanism reaches the FWD / REV selection position, it has already been determined whether it is FWD play or REV play. , Is in the play mode state determined by the lapse of time T ₄ , and then shifts to the first stop mode in the same manner as in the former case.

Furthermore, even if the initial switch 46 is turned on during execution of the FWD or REV play mode or FF mode,
After the initial switch 46 is turned on and the current mode is continued for the time T ₄ , the mode is switched to the first stop mode or the second stop mode and stopped.

At any other time, the initial switch 46
When turned on, it always shifts to stop mode and stops.

Only in the REW mode, the initial switch 4
When 6 is turned on, it does not shift to the original third stop mode but shifts to the second stop mode. Shown in FIG.
When the initial switch 46 is turned on in REV mode, the motor 2
5 is reversed and rotates clockwise, so slip gear 1
9 starts rotating counterclockwise, and the fast-forward gear lever 17 rotates counterclockwise around the shaft 1a accordingly, so that the fast-forward gear 8a separates from the REV idler gear 13 and meshes with the FWD idler gear 12. In other words, FF with the lapse of time T ₄
The mode is changed to the second stop mode since the FF mode is changed to the stop mode.
Although the main operation of the auto-reverse type tape player of the present embodiment has been described, particularly in this tape player, the play gear 16 is meshed with the FWD idler gear 12 or the REV idler connecting gear 14, and the fast-forward gear 18a and the FWD idler gear 12 or. Is RE
The meshing with the V idler gear 13 is not performed when the PAD cam 24 is driven, and the rotational force is transmitted at the timing when the PAD cam 24 is stopped, thereby reducing the load on the motor.

In the above embodiment, each time the switch is turned on,
Providing a means for issuing an operation confirmation sound can increase the certainty in the operation, leading to improvement in operability.

Also, the one-cycle mode is set when the play switch is first turned on, and the endless mode is set when the next play switch is turned on. However, the endless mode is set first, and then the one-cycle mode is set. You may do it. Further, in addition to the one-cycle mode and the endless mode, it is possible to provide a mode in which only one side of the magnetic tape is executed so that these modes can be selected by the number of ON operations of the play switch.

Furthermore, by setting the time T ₁ to be slightly longer, the fast-forward gear lever 17 rotates clockwise around the shaft 1a from the second stop mode shown in FIG. 1, and the fast-forward gear 18a meshes with the REV idler gear 13. If the supply gear 3 can be slightly rotated in the REW direction, that is, in the rewinding direction, the slack of the tape, which is a problem when the second stop mode is switched to the play mode as well as the third stop mode, can be prevented. It can be removed, and it is possible to prevent winding around a pinch roller or the like. In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

<Effects of the Present Invention> As described above, according to the present invention, the mode selection position can be accurately detected regardless of the change in the rotation speed of the motor, and a reliable and stable mode selection operation can be performed. It is possible to provide an excellent reverse type tape player used as.

[Brief description of drawings]

1 to 7 are plan views showing each mode of a tape running mechanism of a headphone stereo cassette tape player in an embodiment of the present invention, and FIGS. 8 to 11 are perspective views showing an assembled structure of the mechanism. 12 to 16 are operation explanatory views showing different operation states of respective parts centering on the PAD cam in the same mechanism, and FIG. 17 is a schematic plane view showing a positional relationship between the printed circuit board and the PAD cam, motor and the like in the same mechanism. Fig. 18 is a sectional view taken along the line AA 'in Fig. 17,
FIG. 19 is a block diagram showing a control system of the tape player,
20 to 25 are control flowcharts of the tape player. 2a: Take-up reel stand, 3a: Supply reel stand, 15: Play gear lever, 16: Play gear, 17: Fast forward gear lever, 18a, 18
b: Rapid feed gear, 19: Slip gear, 24: PAD cam, 25: Motor, 28: Sub operation lever, 30: Pinch roller operation lever,
31: Solenoid lever, 33: Solenoid, 34: Fast-forward locking lever, 36: Select lever, 41: Control circuit section, 49: Motor voltage detection section.

Claims (1)

(57) [Claims] 1. A cam body that rotates using a motor as a drive source, and a cam body that is operated by the cam body to perform mode switching and that has a positional relationship with the cam body at a mode selection position during rotation of the cam body. A lever member that can be changed, a drive means that displaces the lever member to change the positional relationship between the cam body and the lever member, and a mode selection position is detected by the elapsed time after the activation of the cam body reaches a preset reference time. And a control means for operating the drive means when a mode selection position detection signal is input from the selection position detection means and a signal is input based on a play mode switching command. In the auto-reverse type tape player which sets the play mode according to the positional relationship between the cam body and the lever member by the subsequent rotation of the cam body, Serial selecting position detecting means auto-reverse type tape player, characterized by sequentially correcting the reference time in accordance with the rotational speed change of the motor.