JPH0450581Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention performs recording or playback on a tape running in two directions, and then retreats the magnetic head from this playing position to a position where it lightly contacts the tape. This relates to an auto-reverse tape player that can perform cue or review operations to find the beginning of a song, etc., and in particular can be used to switch to two-way play mode and cue mode or review mode using one motor and a switching member. The present invention relates to a mode switching device that allows switching.

[Background of the idea]

FIG. 9 is a plan view showing a mode switching device for a conventional auto-reverse tape player. This conventional example is based on the Utility Application filed in 1983, which is the earlier application of the present invention.
This is disclosed in the specification and drawings of No.-79813.

The mode switching device of this auto-reverse type tape player consists of a switching gear 11 as shown in FIG.
The feature is that 1 is provided. This switching gear 1
Teeth 112 are formed around 11, and two tooth missing parts 113a and 113b are provided. Further, a cam 115 for driving the head base and a cam 114 for driving the brake are provided on the surface.

The motor is powered by a pair of left and right flywheels 11.
6a and 116b, and the flywheel 11
Capstan 117a, which is integral with flywheel 6a, is always driven counterclockwise, and capstan 117b, which is integral with flywheel 116b, is always driven clockwise. And capstan 117 on the right
Each mode is switched by driving the switching gear 111 by a drive gear 118 (always rotating counterclockwise) integrated with the drive gear 118. The timing of this mode switching is determined by the solenoid 119. That is, when the solenoid 119 is excited in response to an operation signal, a trigger lever 121 provided on the back side of the chassis 110 rotates, and a lock pin 122 provided at its lower end unlocks the switching gear 111. This results in
The switching gear 111 is rotationally driven by the driving gear 118. When the switching gear 111 rotates, the cam 11
5 moves the head base 125, and the left and right pinch rollers 126a, 126b and the magnetic head 127 are moved to a predetermined mode position.
That is, in the normal play mode or reverse play mode in which recording or playback is performed, the magnetic head 127 is moved to a position where it makes strong contact with the tape, and the pinch roller 126a or 126 is moved to a position where it makes strong contact with the tape.
Either b is the capstan 117a or 11
7b. In the cue mode or review mode, in which the head of a song is searched, etc., the magnetic head 127 is moved back from the play mode to a position where it makes light contact with the tape. Also, at this time, both pinch rollers 126a and 126b are separated from capstans 117a and 117b.

In addition, in each of the above operation modes, the cam 116
The brake lever 128 is lifted by the
The brakes on the left and right reel gears 132a and 132b are released, and the left and right reel stands 131a and 131b are set to a driveable state.

[Problem that the invention attempts to solve]

In this type of auto-reverse type tape player mode switching device, in the normal play mode, the right capstan 117a runs the tape in the right direction, and in the reverse play mode, the left capstan 117b runs the tape in the reverse direction (leftward in the figure). must be driven to.
In addition, in each mode, a pair of reel stands 1
The transmission of power to 31a and 131b must be switched. Furthermore, in the queue mode, both pinch rollers 126a and 126b are connected to the capstan 1.
17a, 117b, and reel stand 13 on the right side.
1a to wind the tape at high speed, and in the review mode, the left reel stand 131
The tape must be rewound at high speed by b.

In the auto-reverse type tape player having the above structure, the forward and backward movement of the magnetic head 127 in the tape direction is controlled by the rotation of the switching gear 111, and the mode switching lever (also driven by the switching gear 111) (not shown) and movement of the head base 125, one of the pair of pinch rollers 126a and 126b is moved toward the capstan 1.
17a and 117b. That is, in both normal play mode and reverse play mode, the right capstan 117a and drive gear 118 are always rotated counterclockwise, and the left capstan 117a is always rotated counterclockwise.
b is always rotated clockwise. The running direction of the tape is selected by selectively bringing the pair of pinch rollers 126a and 126b into contact with the capstan 117a or 117b.
That is, when feeding the tape by the capstans 117a, 117b and the pinch rollers 126a, 126b, one capstan 117
It is sufficient to always rotate the capstan 117b counterclockwise, and it is sufficient to always rotate the other capstan 117b clockwise. On the contrary,
In both normal play and reverse play modes, it is not possible to reverse the rotation direction of the motor with respect to the rotation direction shown in FIG.

On the other hand, a pair of reel stands 131a and 131
b must be selectively powered depending on the mode of operation. That is, in the normal play mode and queue mode, it is necessary to rotate the right reel stand 131a counterclockwise.
In reverse play mode and review mode, it is necessary to rotate the left reel stand 131b clockwise. Moreover, in the normal play mode and queue mode, it is necessary to cut off the power transmission to the left reel stand 131b, which is the tape supply side, and conversely, in the reverse play mode and review mode, the power to the right reel stand 131a must be cut off. I have to cut it off. Therefore, conventionally, as shown in FIG. 9, both reel gears 132a and 132b
By providing an idle gear 133 that selectively meshes with the reel gears 132a and 132,
b are driven separately.

In this way, in the auto-reverse tape player, the capstans 117a, 117b and the reel stands 131a, 131b are driven completely independently, so separate motors must be provided for both drive systems. . Assuming that the same motor is used for both drive systems, both pinch rollers 126a and 126b are connected to the capstan 11 in review mode and queue mode.
7a and 117b, so as the reel stands 131a and 131b are selectively rotated in opposite directions, the capstans 117a and 117b are
There is no problem even if the rotation is reversed. However, as mentioned above, in normal play mode and reverse play mode, the capstan 11
7a and 117b (the right capstan 117a feeds the tape to the right, and the left capstan 11
7b), the power must be transmitted to the reel stands 131a and 131b in reverse in each mode. Therefore, both drive systems are
In the case of a configuration using two motors, even if it is possible to switch to queue mode and review mode, it is impossible to switch to normal play mode and reverse play mode.

As described above, in the conventional auto-reverse type tape player, two motors must be provided in order to enable switching between the above-mentioned modes. In addition, in the case of using one motor, it is necessary to provide a large number of solenoids and a complicated switching mechanism driven by the solenoids. For example, in FIG.
It is necessary to take measures such as providing a plurality of switching gears as shown in 1.

Recent efforts have been made to make tape players smaller and lighter, but unless the number of motors and solenoids can be further reduced, there has been a limit to the reduction in size and weight.

The present invention solves the above conventional problems, and uses one motor and one type of switching mechanism to switch the positions of the magnetic head and pinch roller, and to switch the power transmission to a pair of reel stands. To provide a mode switching device for an auto-reverse type tape player which enables switching operations and enables switching not only between a normal play mode and a reverse play mode but also between a cue mode and a review mode.

[Specific measures to solve the problem]

The mode switching device for an auto-reverse tape player according to the present invention includes a pair of capstans 4a and 4b that are rotationally driven by a motor M, and a reel drive gear 11.
The reel drive gear 11 is engaged with the reel drive gear 11, and swings according to the rotational direction of the reel drive gear 11, and selectively engages the pair of reel gears 3a and 3b provided on the pair of reel stands 2a and 2b. An idle gear 15 that meshes with the idle gear 15, one of the pair of reel gears 3a and 3b that is movably supported, and the idle gear 1
5, a regulating portion 71 that restricts movement of the gear 50 in the direction of meshing with both one reel gear and the idle gear, and the idle gear 15. A regulation lever 70 has a regulation part 72 that prevents the swinging motion in the direction of the reel gear on the side that does not mesh with the regulation lever 70, and when switching to either normal play mode or reverse play mode, the regulation lever 70 By pressing the lever 70 in the direction of the reel stands 3a, 3b, the restriction part 71 allows the gear 50 to move in the direction of the reel gear, and the restriction part 72 allows the movement of the gear 50 in the direction of the reel gear.
The regulating lever 70 moves away from the reel stand when switching from the normal play mode or reverse play mode to the queue mode or review mode in which the magnetic head is moved back to a position where the magnetic head lightly contacts the tape. The regulating portion 72
is provided with a switching member 40 for retracting the idle gear 15 to a position that allows the swinging motion of the idle gear 15, and the switching member 40 is provided with:
Another regulating portion 40d is provided to move the gear 50 away from the reel gear and the idle gear when switching from the normal play mode or reverse play mode to the queue mode or review mode.

This auto-reverse type tape player is equipped with only one motor M, and in both normal play mode and reverse play mode, the reel drive gear 11 and the pair of capstans 4
a and 4b are rotated in the same direction. When switching between the normal play mode and the reverse play mode, when switching the driving force to the reel stands 2a and 2b, in one mode, the power from the reel drive gear 11 is transferred to one side by swinging the idle gear 15. When switching to another mode, the rotational direction of the reel drive gear 11 is left as is, the swinging motion of the idle gear 15 is restricted, and the switching gear 50 is moved. It is interposed between the idle gear 15 and the other reel gear 3b to transmit reversed power to this reel gear 3b. Furthermore, when switching to queue mode or review mode, the restriction on the idle gear 15 by the restriction part 72 is released, and the gear 50 is separated from the idle gear 15 by the other restriction part 40d, so that the idle gear 50 can swing. put it in a state. When switching between the queue mode and the review mode, the tape feeding direction is switched by rotating the motor M in forward and reverse directions.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 8.

Figure 1 is a plan view of an auto-reversing tape player seen from the front side of the chassis, Figure 2 is a plan view of the drive unit placed on the back of the chassis seen through the chassis, and Figures 3 and 4. The figure is a plan view showing the switching gear provided in the drive unit according to its operation, and Figures 5 to 8 are plan views showing the mode switching mechanism arranged on the back side of the chassis according to its operation when looking through the chassis. .

On the back side of the chassis 1, there are arranged members that constitute the drive section shown in FIG. 2 and members that constitute the mode switching mechanism shown in FIGS. 5 to 8, but for convenience of explanation, they are shown separately. It shows.

As shown in FIG. 1, on the surface of the chassis 1,
A pair of reel stands 2a and 2b are provided. Each of the reel stands 2a and 2b has a reel gear 3a.
and 3b.
A pair of capstans 4a and 4b are rotatably provided on the surface of the chassis 1, and a cassette half (not shown) can be loaded onto these members.

As shown in FIG. 2, in this auto-reverse type tape player, one motor M and one solenoid S, which serve as a driving source, are provided on the back surface of the chassis 1. With only this one motor M and one solenoid S, it is possible to set various modes and drive the tape in each mode.

As shown in FIG. 2, a drive pulley 5 is fixed to the motor M. Further, on the back surface of the chassis 1, a driven pulley 6 supported by a shaft 7 and flywheels 8 and 9 are arranged. The flywheel 8 is integrated with the capstan 4a, and the flywheel 9 is integrated with the capstan 4b. Drive pulley 5, driven pulley 6
A rubber belt 10 is wrapped around each of the flywheels 8 and 9, and each is driven to rotate by the power of a motor M. The motor M rotates in both forward and reverse directions. Motor M rotates counterclockwise in normal play mode, reverse play mode, tape fast forward mode, and cue mode.
The rubber belt 10 is driven in the α direction. Further, it rotates clockwise only in the tape rewind mode and review mode, and the rubber belt 10 is driven in the β direction.

As shown in FIG. 1, a reel drive gear 11 is rotatably supported on the shaft 7. That is, the driven pulley 6 and the reel drive gear 11 are overlapped,
Each is supported so as to be able to rotate independently about a common axis 7. Further, a friction member 12 made of felt or the like is interposed between the driven pulley 6 and the reel drive gear 11, and the driven pulley 6 and the reel drive gear 11 are urged in the direction of pressure contact with each other by a spring or the like. . Due to this pressure contact structure, the driven pulley 6 and the reel drive gear 11 are
When the load is small, they rotate as one, and when a load acts on the reel drive gear 11, slippage occurs between the driven pulley 6 driven by the motor M and the reel drive gear 11. There is.

As shown in FIG. 1, an idle arm 13 is rotatably supported on a shaft 7 that supports a driven pulley 6 and a reel drive gear 11, and a pin 14 is attached to the tip of this idle arm 13. An idle gear 15 is supported. The idle gear 15 is always in mesh with the reel drive gear 11. The idle arm 13 and the idle gear 15 constitute a swing mechanism. When the reel drive gear 11 is driven counterclockwise by the motor M,
The idle arm 13 is driven counterclockwise together, and the idle gear 15 meshes with the right reel gear 3a. The right reel gear 3a and reel stand 2a are then driven counterclockwise. Conversely, when the reel drive gear 11 rotates clockwise, the idle gear 15 meshes with the left reel gear 3b, and the left reel gear 3b and reel stand 2b are driven clockwise.

As shown in FIGS. 2 to 4, a switching gear 20 is provided on the back side of the chassis 1. As shown in FIGS. This switching gear 20 is used to switch between various modes by its rotational operation. The switching gear 20 is rotatably supported by the chassis 1 by a shaft 21. A drive gear 16 is fixed to the right capstan 4a, and teeth around the switching gear 20 face the drive gear 16 at positions where they mesh with it. There are two tooth missing parts X and Y around the switching gear 20.
is opposed to the drive gear 16, the power of the drive gear 16 is not transmitted to the switching gear 20, and when the missing portions X and Y are removed from the drive gear 16, the drive gear 16 moves to The power of the motor M is transmitted to the switching gear 20 via the drive gear 16.

The back surface of the drive gear 20 has a concave shape, and the peripheral wall surface 22 thereof has triangular stopper projections 23a and 23b protruding toward the center. Also,
Another stopper projection 23c is located slightly away from one stopper projection 23b toward the center.
is formed. On the other hand, a trigger lever 30 is provided on the back surface of the chassis 1. This trigger lever 30 is rotatably supported by the chassis 1 by a pin 31. trigger lever 30
The connecting protrusion 32 at the upper end of the figure is connected to the plunger of the solenoid S. Also trigger lever 3
0 is urged counterclockwise by a spring 33, that is, in the direction in which the solenoid S protrudes. A lower end 30a of the trigger lever 30 extends to the back surface of the switching gear 20, and a lock pin 34 is fixed to this lower end 30a. Lock pin 3
4 is inserted into a recess on the back surface of the switching gear 20. This lock pin 34 is connected to the stopper protrusion 23.
When the switching gear 20 is engaged with any one of the gears a, 23b, and 24c, clockwise rotation of the switching gear 20 is prevented.

An L-shaped head base drive cam 24 is provided protruding from the surface of the switching gear 20. This head base drive cam 24 is for driving a head base 40, which will be described later. Three guide cams 25a, 25b, and 25c are provided on the back surface of the switching gear 20. A guide passage _Z1 exists between guide cams 25a and 25b, and a guide passage Z1 exists between guide cams 25b and 25c.
Between them is the guide passage _Z2 . The position of a mode switching lever 60, which will be described later, is determined by these guide passages _Z1 and _Z2 .

As shown in FIG. 1, on the surface of the chassis 1,
A head base 40 is provided. This head base 40 is supported so as to be slidable in the vertical direction (E-L direction) in the figure. A magnetic head 41 is supported on the head base 40. This magnetic head 41 is located in the normal direction of the tape (toward the right in the figure).
The structure is such that it can support both forward and reverse driving modes (to the left in the diagram). When the head base 40 moves in the direction A, the magnetic head 4
1 comes into contact with the tape, and when the head base 40 moves in the direction RO, the magnetic head 41 separates from the tape.

The head base 40 also controls the operation of a pair of pinch rollers 42a and 42b. The pair of pinch rollers 42a and 42b are opposed to the capstans 4a and 4b, respectively. The right pinch roller 42a is held by a holder 43a, and this holder 43a is rotatably supported by the chassis 1 by a pin 44a. Further, the left pinch roller 42b is held by a holder 43b, and the holder 43b is rotatably supported by the chassis 1 by a pin 44b. The right holder 43a is urged clockwise by a spring (not shown), the left holder 43b is urged counterclockwise, and both pinch rollers 42a and 42b are pushed in the direction of pressing against the capstans 4a and 4b, respectively. has been done. However, both the left and right holders 43a and 4
3b is integrally provided with holder pins 45a and 45b, and these holder pins 45a and 45b are locked to regulating sides 40a and 40b provided on the left and right sides of the lower end of the head base 40 in the drawing. When the head base 40 retreats in the direction A, the holder pins 45a and 4
5b is retracted, pinch rollers 42a and 4
2b is separated from the capstans 4a, 4b. Conversely, when the head base 40 moves in the A direction, the pinch rollers 42a and 42b move toward the capstans 4a and 4b by the force of the spring.

The head base 40 is urged in the direction R by the force of a spring 46. Also head base 4
A drive piece 40c is provided at the center of the drive piece 40c. This drive piece 40c is bent toward the back surface of the chassis 1. The drive piece 40c is brought into contact with the head base drive cam 24 on the switching gear 20 by the biasing force of the spring 46. Therefore, when the switching gear 20 rotates clockwise, the head base drive cam 24 presses the drive piece 40c to drive the head base 40 in the A direction.

A reverse gear 50 is provided within a window provided at the top of the head base 40. This reverse gear 50 is connected to the reverse arm 5 by a pin 51.
It is supported at the tip of 2. Reverse arm 52
is located on the back side of chassis 1, and pin 53
It is rotatably supported with respect to the chassis 1 by. A reverse regulating pin 54 provided at the center of the reverse arm 52 and a reverse gear 50 protrude toward the surface of the chassis 1. As shown in FIG. 5, the reverse arm 52 is always urged clockwise by a spring 55, that is, in the direction in which the reverse gear 50 meshes with the reel gear 3b. Further, a first regulating piece 40d is formed at the upper end of the head base 40 in the drawing. In the state shown in FIG. 1, the head base 40 is moving in the direction B, so the reverse regulating pin 54 is
By intervening in the groove 40e on the side of 0d,
Clockwise rotation of the reverse arm 52 is restricted.

Further, as shown in FIG.
A pair of pressing pieces 40f and 40g are provided on the left and right sides of the central portion. Each of the pressing pieces 40f and 40g is bent toward the back of the paper and protrudes toward the back side of the chassis 1.

As shown in FIGS. 5 to 8, a mode switching lever 60 is provided on the back surface of the chassis 1. In FIGS. 5 to 8, the head base 40 (provided on the surface of the chassis 1) is shown in dashed lines for the purpose of explaining the operation.

The mode switching lever 60 is supported with respect to the chassis 1 so as to be able to move only in the left-right direction (arrow direction), and is biased in both directions by a spring 61. At the lower end of the mode switching lever 60 in the drawing, there is a drive piece 62 bent upward in the drawing (shown only in Fig. 5 and omitted in Figs. 6 to 8).
is provided, and a drive pin 63 is fixed to the tip of this drive piece 62. As shown in FIG. 2, the drive pin 63 is inserted into a recess on the back surface of the switching gear 20, and the drive pin 63 is lined up on the left side of the lower end 30a of the trigger lever 30.
When the switching gear 20 rotates, the drive pin 63
is the guide passage Z ₁ or Z ₂ on the back side of the switching gear 20
(see FIG. 3), thereby determining the movement position of the mode switching lever 60 in the harness direction.

Pinch roller regulating windows 64a and 64b are formed at the left and right positions of the lower end of the mode switching lever 60 (see FIG. 5). This pinch roller regulation window 6
A step is provided at the upper ends of 4a and 64b in the drawing, and the portions projecting downward in the drawing through this step become restriction sides 65a and 65b. Each holder 43a, 4 of the pinch rollers 42a, 42b
The holder pins 45a and 45b provided on the head base 40 pass through the regulating sides 40a and 40b of the head base 40, and are inserted into the pinch roller regulating windows 64a and 64b of the mode switching lever 60. That is, the regulating side 40 provided on the head base 40
The positions of the pinch rollers 42a, 42b are alternately regulated by the combination of the regulating sides 65a, 65b provided on the mode switching lever 60 and the pinch rollers 42a, 40b.

A regulation lever 70 is connected to the upper end of the mode switching lever 60 (see FIG. 5). A pin 66 is fixed to the upper end of the mode switching lever 60,
This pin 66 is inserted into an elongated hole 70a formed in the regulation lever 70, and the regulation lever 70 is connected to the mode switching lever 60 so as to move in the yellow direction. Further, the mode switching lever 60 and the regulation lever 70 are connected by a spring 73, and the contraction force of the spring 73 urges the regulation lever 70 in the direction B, and the regulation lever 70 is pulled into the mode switching lever 60. connected in the state. This regulation lever 70 has a second regulation piece 7 formed in a protruding shape downward in the figure.
1, and a third regulating piece 7 formed in a projecting shape upward in the figure.
2 are integrally formed. The second regulating piece 71 is the reverse regulating pin 5 on the reverse arm 52.
4, and the third regulating piece 72
is for regulating the pin 14 of the idle gear 15.

Furthermore, pressure pieces 70b and 70c are provided on the left and right sides of the lower end of the regulation lever 70 in the drawing. The pressure pieces 70b and 70c are bent toward the front of the paper in FIG. These pressure pieces 70b and 7
0c comes into contact with the pressing pieces 40f and 40g of the head base 40 under certain conditions (in the state shown in FIG. 7).

Next, the operation of the auto-reverse type tape player having the above structure will be explained for each mode.

(Stop Mode) FIGS. 1, 2, and 5 show the stop mode. At this time, the switching gear 20 is stopped because its stopper protrusion 23a is engaged with the lock pin 34 (solenoid S is not energized). At this time, the missing tooth portion X of the switching gear 20 faces the drive gear 16. Also, the switching gear 20
Since the upper head base drive cam 24 is in a position extending downward in the drawing, the head base 40 is not subjected to any driving force from the head base drive cam 24 and is moved in the direction R by the spring 46. Therefore, the magnetic head 41 on the head base 40 is separated from the tape. Furthermore, the holder pins 45a, 45b, which are integrated with the pinch roller holders 43a, 43b, are pushed down by the regulating sides 40a, 40b of the head base 40, and the pinch rollers 42a, 42b are connected to the capstan 4a, 45b.
It has retreated to a position away from b.

Furthermore, as shown in FIGS. 1 and 5, a first regulating piece 4 provided at the upper end of the head base 40
The reverse regulating pin 54 is pushed downward in the figure by the groove 40e on the side 0d, and the reverse arm 52 is rotated counterclockwise. Therefore, the reverse gear 50 is separated from the left reel gear 3b.

In addition, in FIG. 5, the mode switching lever 60
is moved in two directions by the force of the spring 61.

(Tape fast-forward mode and rewind mode) When the motor M is rotated counterclockwise from the stop mode shown in FIGS. 1, 2, and 5, the rubber belt 10 runs in the α direction. The driven pulley 6 is then driven counterclockwise. At the same time, the flywheel 8 on the right side is driven counterclockwise, and the flywheel 9 on the left side is driven clockwise.
When the driven pulley 6 is driven counterclockwise, the first
The reel drive gear 11 shown in the figure also rotates counterclockwise. This rotation causes idle arm 1
3 swings counterclockwise, and the idle gear 15 meshes with the right reel gear 3a. Therefore, the right reel stand 2a is driven counterclockwise, and the tape is fast-forwarded.

Conversely, when the motor M is rotated clockwise, the rubber belt 10 travels in the β direction, and the driven pulley 6 and reel drive gear 11 are driven clockwise. This rotation causes idle arm 1
3 swings clockwise, the idle gear 15 is engaged with the left reel gear 3b, the left reel stand 2b is driven clockwise, and the tape is rewound.

(Switching to Normal Play Mode) The normal play mode is an operation mode in which recording or playback is performed while the tape in contact with the magnetic head 41 is traveling rightward in the figure.

When switching to normal play mode, the first
In the stop mode shown in FIGS. 2 and 5, the motor M is started counterclockwise to cause the rubber belt 10 to travel in the α direction, and the solenoid S is energized for a short time. When solenoid S is energized, the plunger is attracted and the trigger lever 3
0 is driven clockwise, and the lock pin 34 separates from the stopper protrusion 23a. At this time, a biasing force in the clockwise direction is applied to the switching gear 20 by a brake lever (not shown) or the like. Therefore, when the lock pin 34 separates from the stopper protrusion 23a, the switching gear 20 is immediately driven clockwise by the biasing force, the missing portion X is disengaged from the drive gear 16, and the teeth of the switching gear 20 are connected to the drive gear 16. meshes with Since the drive gear 16 is driven counterclockwise by the motor M, after the missing part X is removed,
The switching gear 20 is rotated clockwise by the drive gear 16 . Immediately after the lock pin 34 separates from the stopper protrusion 23a, the solenoid S becomes de-energized, so the trigger lever 30 is moved by the spring 33.
Returns counterclockwise due to force. Therefore, when the next missing portion Y of the switching gear 20 moves to the position facing the drive gear 16, the stopper protrusion 23b hits the lock pin 34, and the switching gear 20 is locked again at this position (the third state).

While the switching gear 20 rotates from the state shown in FIG. 2 to the state shown in FIG.
However, in order to press the drive piece 40c shown in FIG. 1 upward in the drawing, the head base 40 moves in the direction A. When the switching gear 20 is locked in the state shown in FIG. 3, the head base 40 moves to the maximum in the A direction and then stops.

On the other hand, while the switching gear 20 rotates, the guide cam 25c provided on the back surface of the switching gear 20 draws the drive pin 63 into the guide passage _Z2 (see FIG. 3). Therefore, the mode switching lever 60 stops in a state where it has moved slightly in the direction C compared to the stop mode shown in FIG. FIG. 6 shows this normal play mode.

By moving the head base 40 in the direction A, the magnetic head 41 advances to a position where it comes into contact with the tape. Also, when the head base 40 moves forward,
The holder pins 45a and 45b, which have been restricted by the restriction sides 40a and 40b, are now in a state where they can move forward, and the pinch rollers 42a and 42b move forward in the direction of the capstans 4a and 4b by the force of the spring. However, as shown in FIG. 6, a pair of regulating sides 65 provided on the mode switching lever 60
Since the left one 65b moves to a position where it prevents the holder pin 45b from moving forward, the left pinch roller 42b does not come into contact with the capstan 4b, and only the right pinch roller 42a comes into pressure contact with the capstan 4a.

Further, as the head base 40 moves in the A direction, the reverse arm 52, which had been restricted by the groove 40e of the head base 40, is driven clockwise by the force of the spring 55. However, as shown in FIG. 6, since the reverse restriction pin 54 comes into contact with the second restriction piece 71 provided on the restriction lever 70, further rotation of the reverse arm 52 is restricted. Therefore, the reverse gear 50 is located away from the left reel gear 3b and the idle gear 15.

As mentioned above, in this normal play mode, the driven pulley 6 and the reel drive gear 11 are driven counterclockwise by the power of the motor M, so the idle gear 15 swings counterclockwise. , meshes with the right reel gear 3a, and the left reel stand 2a is driven counterclockwise. Therefore, the tape in the cassette half to be loaded is wound up by the right reel stand 2a, and the tape is held between the right capstan 4a and the pinch roller 42a that is in pressure contact with it, and is fixed in the right direction in the figure. Sent out at high speed. A recording or reproducing operation is performed by the magnetic head 41 that is in contact with the tape.

In addition, motor M in normal play mode
The rotation speed is the same as in the fast forward mode described above. Since the tape is fed out at a low speed in accordance with the feeding speed of the capstan 4a, the reel stand 2a
The number of revolutions per unit time is more regulated than in the fast forward mode. At this time, the difference between the rotational speed of the reel stand 2a and the rotational speed of the driven pulley 6 is determined by the difference between the rotational speed of the reel stand 2a and the rotational speed of the driven pulley 6.
It is absorbed by the slip between the driven pulley 6 and the driven pulley 6.

(Switching from normal play mode to cue mode or review mode) In cue mode, the tape is fast forwarded to the right,
The review mode is a state in which the tape is rewound to the left and the magnetic head 41 is in light contact with the tape. The cue mode or review mode is used to locate the beginning of a song.

When the solenoid S is excited in the normal play mode (the state shown in FIG. 3), the lock pin 34 separates from the stopper protrusion 23b. In the normal play mode, the head base 4 is moved by the spring 46.
The return force in the direction of 0 is the head base drive cam 2.
4, the switching gear 20 continues to be biased clockwise. Therefore, when the lock pin 34 separates from the stopper projection 23b, the switching gear 20 rotates clockwise due to this biasing force, and the switching gear 20 is locked again with the stopper projection 23c in contact with the lock pin 34. (See Figure 4).
At this time, the missing portion Y of the switching gear 20 is the drive gear 16.
remains facing. In queue mode or review mode, solenoid S continues to be energized,
The state shown in FIG. 4 is maintained.

When the switching gear 20 rotates slightly to the position shown in FIG. 4, the head base drive cam 24 also rotates slightly clockwise, so that the head base 40 is moved slightly backward from the normal play mode position. In the normal play mode, the magnetic head 41 makes strong contact with the tape, bending the tape into the cassette half, but in the queue mode or the review mode, the magnetic head 41 retreats in the direction of the arrow and returns to a position where it lightly contacts the tape. Become. Furthermore, the right side pinch roller 42a is controlled by the right side regulating side 40a of the head base 40 so that the capstan 4a
be separated from

In addition, similarly to the normal play mode shown in FIG.
4 is regulated, the reverse gear 50 remains separated from the left reel gear 3b and the idle gear 15, and the swinging motion of the idle gear 15 is not hindered by the reverse gear 50.

The queue mode is performed by rotating the motor M counterclockwise in the above state. Similar to the tape fast-forward mode, the right reel gear 3a is driven counterclockwise by swinging the idle gear 15. Since the pinch roller 42a is separated from the capstan 4a, the force of the capstan 4a does not act on the tape, and the tape is wound at a high speed by the right reel stand 2a.
A magnetic head 41 that is in light contact with the tape is used to locate the beginning of a song. Conversely, in the review mode, the motor M is reversely rotated clockwise. The reel drive gear 11 is driven clockwise, and the swinging motion of the idle gear 15 causes the left reel stand 2b to be driven clockwise.

(Switching from normal play mode, queue mode, or review mode to stop mode) When switching from normal play mode to stop mode shown in FIG. 6, the mode is first switched to queue mode or review mode, and then the mode is shifted to stop mode.

In the queue mode or review mode, the switching gear 20 is in the state shown in FIG. When the solenoid S, which has been energized in the queue mode or the review mode, is de-energized, the trigger lever 30 is returned counterclockwise by the spring 33. Therefore, the lock pin 34 is removed from the stopper projection 23c. Since the switching gear 20 continues to be pushed in the direction of the arrow by the head base 40, the lock pin 34
When removed, the switching gear 20 rotates clockwise and the missing portion Y is removed from the drive gear 16. Thereafter, the switching gear 20 is engaged with the drive gear 16, which continues to be driven by the motor M, and is rotated clockwise. The rotation of this switching gear 20 is controlled by the stopper protrusion 2.
This continues until 3a hits the locking pin 34.
During this time, the head base 40 is moved back in the direction R by the force of the spring 46.

When the mode returns to the stop mode shown in FIGS. 1, 2, and 5, the switching gear 20 is locked again, the magnetic head 41 is separated from the tape, and the left and right pinch rollers 42a and 42b are connected to the capstan 4a. , 4b.

Further, during the transition to the stop mode, the reverse restriction pin 54 is pushed downward in the figure by the lower oblique side of the first restriction piece 40d provided on the head base 40, and the reverse arm 52 is rotated counterclockwise. After shifting to the stop mode, the reverse regulating pin 54 is held in the groove 40e as shown in FIG.

(Switching from stop mode to reverse play mode) In reverse play mode, the tape in contact with the magnetic head 41 is fed to the left in the figure, that is, recording and playback are performed with the tape traveling direction reversed from normal play mode. will be carried out.

Switching to reverse play mode is basically the same as switching to normal play mode, but the position of the mode switching lever 60 is different from that in normal play mode.

Switching to the reverse play mode is performed by energizing the solenoid S in the stop mode shown in FIGS. 1, 2, and 5. When the solenoid S is energized and the lock pin 34 of the trigger lever 30 separates from the stopper protrusion 23a, the switching gear 20 is driven clockwise, and the switching gear 20 reaches the locked state shown in FIG. 3. During this time, head base 40
is moved in the A direction by the head base drive cam 24.

However, when switching from stop mode to reverse play mode, solenoid S is energized longer than when switching to normal play mode. When the solenoid S is energized for a long time, the lower end 30a of the trigger lever 30, which is driven clockwise, engages the drive piece 6 of the mode switching lever 60.
Push out the drive pin 63 provided at 2 to the left in the figure. When the switching gear 20 rotates clockwise in this state, the guide cam 25a on the back side of the switching gear 20
The tip of the drive pin 63 is engaged with the drive pin 63, and the subsequent rotation of the switching gear 20 causes the drive pin 63 to move into the guide path.
Z ₁ (see FIG. 3), and the mode switching lever 60 is stopped in the direction C.

When the mode switching lever 60 moves in the direction C,
Since the regulation lever 70 also moves together, the pressure pieces 70b and 70c of the regulation lever 70 move to the left in the figure, and press the pressure pieces 40f and 40 of the head base 40.
This leads to facing g. When the switching gear 20 rotates to the state shown in FIG. 3 and the switching to reverse play mode is completed, the head base 40 is moved in the direction A by the head base drive cam 24, but at this time the pressing pieces 40f and 40g are Pressure pieces 70b and 7
0c, the regulating lever 70 is lifted in the A direction (the state shown in FIG. 7). This regulation lever 7
The movement of 0 in the A direction is permitted by stretching the spring 73 between the mode switching lever 60 and the mode switching lever 60. In the state shown in FIG. 7, the second regulating piece 71 moves to the left and comes off the reverse regulating pin 54, so the reverse arm 52 can rotate clockwise due to the force of the spring 55 without being restricted in any way. , the reverse gear 50 is the left reel gear 3b
and the idle gear 15. Further, when the regulating lever 70 moves upward in the A direction, the third regulating piece 72 comes into contact with the right side of the pin 14 supporting the idle gear 15, thereby regulating the swinging motion of the idle arm 13 in the counterclockwise direction.

In the reverse play mode, the rotation direction of the motor M is the same counterclockwise direction as in the normal play mode. Therefore, the driven pulley 6 and the reel drive gear 1
The rotation direction of No. 1 is counterclockwise. As shown in FIG. 7, since the counterclockwise swing of the idle gear 15 at this time is restricted by the third restriction piece 72, the idle gear 15 does not mesh with the right reel gear 3a. The rotation of the idle gear 15 is transmitted to the left reel gear 3b via the reverse gear 50. As a result, the left reel gear 3b and reel stand 2b are driven clockwise.

On the other hand, since the rotation of motor M is counterclockwise,
The left capstan 4b is driven clockwise together with the flywheel 9 at a constant speed. Furthermore, the seventh
As shown in the figure, in the reverse play mode, the mode switching lever 60 moves in the direction C.
Regulation side 65a of right pinch roller regulation window 64a
is opposed to the front of the right holder pin 45a. Therefore, even if the head base 40 moves in the A direction, the rotation of the holder 43a of the right pinch roller 43a is restricted by the restriction side 65a. Therefore, only the left pinch roller 42b is connected to the capstan 4.
b, and the right pinch roller 42a is separated from the capstan 4a.

Therefore, the tape is attached to the left capstan 4b.
and the pinch roller 42b, and is sent to the left at a constant speed by the rotation of the capstan 4b. At the same time, the tape is wound up by the left reel stand 2b. Recording or reproduction is performed by the magnetic head 41 on the tape traveling leftward in the figure.

(Switching from Reverse Play Mode to Queue Mode or Review Mode) In the reverse play mode, the switching gear 20 is locked in the state shown in FIG. 3. If solenoid S is excited and continues to be energized, the fourth
As shown in the figure, the switching gear 20 is locked with the stopper protrusion 23c in contact with the lock pin 34. At this time, the head base 40 is slightly retreated in the direction A. Accordingly, as shown in FIG. 8, the regulating lever 70, which had been lifted by the head base 40, is returned in the direction B by the force of the spring 73. Then, the third regulating piece 7 of the regulating lever 70
2 moves backward to enable swinging motion of the idle gear 15. Also, the first regulating piece 40 of the head base 40
d pushes the reverse restriction pin 54 in the direction B, and the reverse arm 52 is rotated counterclockwise.
The reverse gear 50 is separated from the reel gear 3b and retreats to a position where it does not interfere with the swing of the idle gear 15.

The magnetic head 41 comes into light contact with the tape due to the retreat of the head base 40 in the direction A.
Further, the pinch roller 42b is separated from the capstan 4b by the regulating side 40b of the head base. Therefore, when the motor M is rotated counterclockwise, the reel drive gear 11 rotates counterclockwise, the idle gear 15 swinging in the same direction engages with the right reel gear 3a, and the right reel stand 2a rotates. The tape is driven to fast-forward and a cue operation is performed. Conversely, if the motor M is driven clockwise, the idle gear 15 swings and the left reel gear 3
b, the left reel stand 2b is driven, the tape is rewound, and a review operation is performed.

In the illustrated embodiment, the reverse gear 50 is interposed between the left reel gear 3b and the idle gear 15 when switching to reverse play mode, but conversely, when switching to normal play mode, gear 50 is interposed between The same device as above may be interposed between the right reel gear 3a and the idle gear 15, and at the same time, the clockwise swing of the idle gear 15 may be restricted. However, in this case, contrary to the illustrated embodiment, it is necessary to keep the reel gear 11 constantly rotating clockwise in the normal play mode and reverse play mode.

[Effect of idea]

As described above, according to the present invention, for example, when switching to reverse play mode, the reverse gear is interposed between one reel gear and the idle gear, and the idle gear is prevented from swinging in the direction of the other reel gear. Since this is prevented, it is sufficient to keep the reel drive gear always rotating in the same direction in both normal play and birth play modes. Therefore, a pair of capstans and a reel drive gear can be driven in the same direction by one motor, and the same motor can be used for the drive system of the capstan and the drive system of the reel stand. Further, when shifting to queue mode or review mode, restrictions on the swinging motion of the idle gear are released, and the reverse gear and the like are separated from the reel gear and the idle gear. Therefore, by rotating the motor in the forward and reverse directions and swinging the idle gear in two directions, it becomes possible to switch between the queue mode and the review mode. Therefore, it is not necessary to provide two motors as in the prior art, and switching to normal play mode, reverse play mode, queue mode, and review mode is possible with one motor. Furthermore, since the mode switching lever and head base for regulating the pinch roller can be used as the switching member for driving the reverse gear, etc., the structure of this switching member is not more complicated than in the past. Furthermore, if the configuration is as shown in the illustrated embodiment, the mode switching lever and the movement of the head base can be realized by one switching gear and one solenoid.

Therefore, according to the present invention, it is possible to configure an auto-reversing tape player with one motor and one solenoid, making it possible to downsize and reduce power consumption.

[Brief explanation of the drawing]

1 to 8 show embodiments of the present invention. FIG. 1 is a plan view of the mode switching device of an auto-reversing tape player viewed from the front side of the chassis, and FIG. A plan view showing the power transmission section arranged on the back side of the chassis in a tape player as seen through the chassis, FIG. 3 is a plan view showing the locked state of the switching gear in play mode, and FIG. 4 shows switching in queue mode or review mode. A plan view showing the locked state of the gear, Fig. 5~
FIG. 8 shows the mode switching mechanism arranged on the back of the chassis in the tape player shown in FIG. 1 according to its operation, and FIG.
FIG. 6 shows the normal play mode, FIG. 7 shows the reverse play mode, and FIG. 8 shows the queue mode or review mode shifted from the reverse play mode. FIG. 9 is a plan view showing a mode switching device of a conventional auto-reverse tape player;
FIG. 10 is a plan view showing the switching gear. 1... Chassis, 2a, 2b... Reel stand, 3
a, 3b... Reel gear, 4a, 4b... Capstan, 8, 9... Flywheel, 11... Reel drive gear, 13... Idle arm, 15...
...Idle gear, 20...Switching gear, 23a, 2
3b, 23c...Stopper projection, 30...Trigger lever, 34...Lock pin, 40...Head base, 40d...Regulation piece that pushes back the reverse gear when switching to queue mode or review mode, 41...Magnetic head, 42a, 42b...
...Pinch roller, 50...Reverse gear, 52...
...Reverse arm, 54...Reverse regulation pin,
55... Spring that biases the reverse gear, 6
0...mode switching lever, 70 regulation lever, 71
...Regulation piece that restricts movement of reverse gear, 72
...Regulation piece that regulates the swing of the idle gear, M
……motor.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of capstans 4a, 4b and a reel drive gear 1 that are rotationally driven by a motor M.
1, which meshes with the reel drive gear 11, swings according to the rotational direction of the reel drive gear 11, and selectively engages the pair of reel gears 3a and 3b provided on the pair of reel stands 2a and 2b. an idle gear 15 that meshes with the idle gear 15; a gear 50 that is movably supported and biased in a direction that meshes with either one of the pair of reel gears 3a, 3b and the idle gear 15; A regulating portion 71 that restricts movement of the reel gear and the idle gear in a direction in which they engage with each other, and the idle gear 1
5 from swinging in the direction of the reel gear that does not mesh with the gear 50.
When switching to either the normal play mode or the reverse play mode, the regulation lever 70 is pressed in the direction of the reel stands 3a, 3b, and the regulation part 71 engages the gear 50. movement in the direction of the reel gear and the regulating portion 72 regulates the swinging motion of the idle gear 15, and furthermore, the magnetic head is moved back from the normal play mode or reverse play mode to a position where the magnetic head lightly contacts the tape. When switching to queue mode or review mode, the regulation lever 7
a switching member 40 that allows the idle gear 15 to move in a direction away from the reel stand and retreats to a position where the regulating portion 72 allows the swinging motion of the idle gear 15; The auto-reverse type tape player is provided with another regulating portion 40d that moves the gear 50 in a direction away from the reel gear and the idle gear when the normal play mode or the reverse play mode is switched to the queue mode or the review mode. mode switching device. (2) The switching member that presses the regulation lever 70 in the direction of the reel stands 2a, 2b is the auto head base 40 that moves the magnetic head 41 toward and away from the tape. Mode switching device for reverse type tape players.