JPS62219254A - Operation switching device for tape recorder - Google Patents

Abstract

PURPOSE:To obtain an operation switching device which is suitable to, specially, an automatic answering telephone set by allowing the sound recording or reproducing state of a 1st tape or a 2nd tape to be selected only by varying the time of electric feeding to a plunger in a stop state. CONSTITUTION:When the plunger 37 is fed with electricity in the stop state, an endless run state is entered and an electric circuit is switched to select the sound recording or reproducing state. When the plunge 37 in the stop state or endless tape run state is fed with the electricity until the endless-tape side contact piece of a relief switch 66 is turned off, a cassette tape constant-speed run state is entered and the electric circuit is switched to start sound recording or reproduction. Then when the plunger 37 in the stop or endless tape run state is fed with the electricity until the cassette-tape side contact piece of the relief switch 66 is turned on, the cassette tape is forwarded fast. When the plunger 37 in the stop or endless tape run state is fed with the electricity continuously, the cassette tape is rewound throughout the electric feeding to the plunger.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is directed to the operation of a tape recorder suitable for an answering machine.
It relates to a switching device.

(b) Conventional technical answering machines are described in Japanese Patent Publication No. 51-48724, for example.
There is a first tape used to transmit a message to the caller, and a second tape used to record the message from the caller.
A drive mechanism for driving the tape was provided completely independently.

(c) Problems to be solved by the invention In the conventional answering machine, as mentioned above, the first tape and the second
Since the drive mechanisms for the tapes are provided independently, each drive mechanism requires a plunger for changing the first tape or the second tape from a stopped state to a recording or reproducing state.

Additionally, answering machines allow messages recorded while the owner is away to be listened to from outside the home. In this case, each plunger is operated by a remote control signal sent from the owner via a telephone line to rewind or play the tape, so each plunger is It was necessary to use a remote control signal that was

By the way, in an answering machine, the recording or playback of a message to the caller and the playback or recording of a message from the caller are not performed at the same time, and the first tape and the second tape are not operated at the same time. . The present invention focuses on the above points, and provides a first recording/playback head for recording or playing back on a first tape and a second recording/playback head for recording or playing back on a second tape on the same slide base, and energizes the plunger. Depending on the time, move the slide base to the first or second position.
To provide an operation switching device for a tape recorder, which allows recording or playback on one tape by sliding it in either direction, and allows switching between recording and playback of the first and second tapes with a single plunger. be.

(d) Means for Solving the Problems The operation switching device for the tape recorder of the present invention has first and second recording/playback devices installed with gap surfaces in different directions and recording or playing back on the first and second tapes, respectively. a slide base having a head and slid in a first direction and a second direction opposite to the first direction; first and second pinch rollers moved in relation to the slide base; and first and second pinch rollers provided opposite to the second pinch roller, respectively.
A capstan, a drive gear selectively connected to a drive mechanism such as a motor and rotated to slide the slide base, and a lock lever that rotates only while the plunger is energized to release the rotation blocking force of the drive gear. - and a base guide plate that is moved by the lock lever and forcibly prevents movement of the slide base in the first direction.

(*) Function The operation switching device for a tape recorder of the present invention has the above-described configuration, and when the plunger is energized and energized in a stopped state, the lock lever is rotated to release the rotation of the drive gear, and the drive gear is rotated. When the slide base is rotated and the slide base is thereby slid in the first direction, the first pinch roller is pressed against the first capstan via the first tape, causing the first tape to run at a constant speed. At this time, the first recording/reproducing head comes into contact with the first tape, so that recording or reproduction of the first tape is performed. When the plunger is energized again in the recording or playback state of the first tape, the driving gear rotates in the same manner as described above, this time sliding the slide base in the second direction, and the second pinch roller moves the second tape through the second tape. It presses against the capstan to record or play back the second tape. If the plunger is further energized in the stopped state, the slide base will begin to slide in the first direction, but the base guide plate will prevent the slide base from sliding in the first direction, resulting in the state of recording or playing the first tape. There is no slide base, and the slide base is the second one.
direction to record or play the second tape.

(F) Embodiment An embodiment of the operation switching device for a tape recorder according to the present invention will be described with reference to the drawings. (1) is a chassis, and (2) is a first direction or A slide base is attached so as to be slidable in the second direction shown by the arrow (B), and the first recording/playback head (3) and the first erasing head are mounted so that the front gap in the center faces the direction of the arrow (A). (4), and the first recording/playback head (3).
and the second recording/playback head (9) and the second erasing head (10) so that the terminals (7) and (8) on the back face the terminals (5) and (6) on the back of the first erasing head (4). and a first one on the diagonal of the slide base (2).
A pinch roller (11) and a second pinch roller (12) are provided. (13) (13) is an engagement pin provided on the slide base (2) that also serves as a guide; (14) is an engagement pin provided on the slide base (2); The take-up reel shaft for winding endless tape, (16)<17) located in the cassette storage chamber (15) formed in the front, is connected to the second recording/playback head (
9) and a take-up reel shaft and a supply reel shaft disposed in a cassette storage chamber (18) formed in front of the second erasing head (10); (19) and (20) are the first pinch roller (11); and a first pinch roller (12) facing the second pinch roller (12).
A first flywheel and a second flywheel (2) having a capstan (21) and a second capstan (22).
3) is a motor, and a power transmission belt ( 26) is suspended. (27> is an auxiliary slide base, which is slidably provided on the chassis (1) like the slide base (2), and has a two-pronged pressure spring (28) that is not fixed at one end.
A guide hole (45) having a letter-shaped groove (42 bars 43) (44)
) is formed. A pin (13) on the slide base (2) protruding from the long holes (29) is located between the two-pronged terminals of the pressure spring (28). (30) is a drive gear having toothless parts (31), (32), and (33), and a non-circular groove (35) into which the drive pin (34) provided on the auxiliary slide base (27) is fitted. The drive gear (30) is eccentrically formed, and the drive gear (30) is formed eccentrically.
It meshes with a first capstan gear (68) provided coaxially with the capstan (21). (37) is a plunger, which is pivotally supported on the shaft (38) and has a locking end (40) that engages with the locking pieces (46a), (46b), and (46c) of the driving gear (30); Lock lever with long piece (39) (
41). (48) is the first winding arm rotatably attached to the shaft (49), and the rotating shaft (50) has first and second idler gears (51) and (52) of different diameters.
is installed. (53) is a second winding arm rotatably attached to the shaft (54), which includes a pinch roller (25) linked to the motor (23) by a belt (26);
It has an early spring reel gear (57) attached to the same shaft (56) as the pinch roller (25), and a lock lever.
It has a pin (59) that engages with a spring (58) that is rotated at (41). (60) is a long hole (61) (61
) is a base guide plate that is slidably attached by a pin (62) (62) that passes through the slide base (2).
A guide window (64) with which the upper pin (63) engages has been formed, and a guide spring (65) mounted on the base guide plate (60) is used to lock the locking long piece (39) of the lock lever (41). ). (66) is a leaf switch. When the slide base (2) is slid in the direction of arrow A, it turns on the contact piece on the endless tape side and puts the recording/playback head (3) etc. into operation, and the slide base (2) When it is slid in the direction of arrow B, the contact piece on the cassette tape side is turned on and the recording/playback head (9) etc. are put into operation.

Next, the operation of the tape recorder operation switching device of the present invention will be explained.

First, in order to use it as an answering machine, a cassette storage chamber (15) is formed in front of the first recording/playback head (3).
), and a recording tape cassette (not shown) is placed in the cassette storage chamber (18) in front of the second recording/playback head (9) to set it on standby. . In such a state, the drive gear (30
) is trying to rotate clockwise, but the drive gear (3
The locking end (40) of the lock lever (41) is locked with the locking piece (46a) of 0) to prevent rotation of the drive gear (30) (FIG. 9).

When a call signal is received and a call is made, the plunger (37) is energized for several seconds and the plunger (37) performs a suction operation to rotate the lock lever (41) counterclockwise. -(41〉) Locking end (40
) and the locking piece (46a) are disengaged, and the drive gear (3
0) is rotated somewhat clockwise. Then the drive gear (3
0) meshes with the capstan gear (68). On the other hand, since the motor (23) is fully energized and rotated at this time, the first capstan gear (68>) is also rotated accordingly.
The drive gear (30) meshing with the capstan gear (68) is rotated clockwise. In the stopped state, the drive pin (34) is inserted into the groove located near the center of the drive gear (30) as shown in FIG. (35), but as the drive gear (30) rotates clockwise, it is moved to the surrounding groove (35), so the auxiliary slide base (27) As the slide base (27) slides in the direction of arrow (A), the pressure spring (28) also moves in the direction of arrow (A) and presses the engagement pin (13).
) is also moved in the direction of arrow (A).

Then, as shown in FIG. 4, the rotating shaft (50) is moved along the slope of the elongated hole (67) formed in the slide base (2), and the first winding arm (49) is moved clockwise. The motor (
The rotational force of 23) is transmitted to the take-up gear (
69) to rotate the take-up reel shaft (14).

At the same time, the first pinch roller (11) on the slide base (2) is also moved and is pressed onto the first capstan (21) via the endless tape (70). On the other hand, in this state, the drive gear (30) is rotated to a position where the toothless part (33) faces the first key-button gear (68), so
The engagement between the drive gear (30) and the first capstan gear (68) is released, and the locking end (40) of the lock lever (41) and the locking piece (46c) engage with each other, so that the drive gear ( 30
) will stop. The endless tape (70) connects the first capstan (21) and the first pinch roller (11).
The first recording and reproducing head (3) reproduces the message previously recorded on the endless tape (<70) and transmits it to the caller, and the driven endless tape is transferred to the first winding shaft (15). ) is wound onto a reel hub that is fitted into the reel hub (Fig. 4).

When the reproduction of the message is finished and the beep tone recorded after the message is reproduced, the plunger (37) is energized again for several milliseconds, so the plunger (37) is attracted and the lock lever ( 41> to release the lock between the locking end (40) and the locking piece (46c), and the drive gear (30
), the drive gear (30) and the first capstan gear (68) mesh with each other to rotate the drive gear (30). The drive pin (34) then moves into the non-circular groove (3
5), the auxiliary slide base (27) is slid in the direction of arrow B, and the pressurizing spring (27) is moved along with the auxiliary slide base (27).
28) presses the pin (13>) and slides the slide base (2) in the direction of the arrow (B), and the second pinch roller (12) connects the second capstan (22) with the cassette tape (71). - A large-diameter take-up gear (72) meshes with the second capstan gear (71), and a large-diameter take-up gear (73) that rotates together with the large-diameter take-up gear (72) meshes with the second capstan gear (71). Since the diameter winding shaft gear (74) meshes with each other, the rotational force from the motor (23) is transferred to the belt (26),
Second flywheel (20), second capstan gear (
71), large diameter winding gear (72) and small diameter winding gear (
73) to the large diameter winding shaft gear (74),
The reel hub on the take-up side fitted to the take-up reel shaft (16) is rotated. Therefore, the second capstan (22)
The cassette tape is driven by the second pinch roller (12) to record the message from the caller applied to the recording head (9) and to wind up the tape (FIG. 6).

At this time, the plunger (37) is not energized and the lock lever (41) is rotated clockwise by the biasing force of the spring (72), and accordingly the U-shaped spring (58> is also rotated clockwise. The U-shaped spring (5
The second winding arm (53), which is engaged with the shaft (56) by the pin (59), is rotated counterclockwise.
When the tip of the guide pin (76) on the second winding arm (53) is guided to the square hole (75) of the slide base (2) and the auxiliary slide base (27) is slid in the direction of arrow B, the guide pin (76) on the second winding arm (53) Groove (43) of slide base (27)
is guided to the neutral position as shown in FIG. 6, and the early spring reel gear (57) is separated from the idler gear (77). Furthermore, at this time, the toothless portion (32) faces the first capstan gear (68), and the plunger (
37) is no longer energized, so the lock lever (4
1) is rotated clockwise by a spring (72), and the locking end (40) of the lock lever (41) engages with the locking piece (46b) of the drive gear (30). (30
) is locked and stopped (Figure 6).

When the end of message recording is detected by a voice detection circuit (not shown), the plunger (37) is energized again for several milliseconds, and the drive gear (30) is driven by the lock lever (41).
) is unlocked and the drive gear (30) is engaged with the first capstan gear (68), so that the drive gear (30) has the toothless portion (31) again connected to the first capstan gear (68). rotated to the opposite position. As the drive gear (30) is rotated clockwise, the engagement pin (34) moves into the groove (3).
5), the auxiliary slide base (27) is slid in the direction of arrow A, and the drive pin (13) and pressure spring (
The slide base (2) interlocked at 28) is also slid in the direction of arrow A, returning to the stopped state shown in FIG.

In the above, we explained the case of recording to a business cassette tape after playing the endless tape, but in order to directly change the business cassette tape from the stopped state to the recording state or playback state, use the slide base (2). The leaf switch (66), which is turned on and off by the movement of the endless tape (70), energizes the plunger (37) until it is turned off.Then, the lock lever (41) is moved counterclockwise. , the engagement between the locking piece (46a) and the locking end (40) of the drive gear (30) is released, and the drive gear (30) is engaged with the first capstan gear (68). At the same time, the lock lever (4
The locking long piece (39) of 1) slides the base guide plate (60) in the direction of arrow C against the spring (78) via the guide spring (65). The drive gear (3
0) is rotated clockwise by meshing with the first capstan gear (68), and slides the auxiliary slide base (27) in the direction of arrow A in the same manner as described above, and accordingly, the slide base (2) also moves in the direction of arrow A. Although the base guide plate (60) is slid in the direction of arrow C, the pin (63) of the slide base (2) is not engaged with the guide window (64) of the base guide plate (60). It is engaged with the joint portion (79) and prevents movement of the slide base (2). Therefore, even when the drive gear (30) is rotated to the position shown in Figure 4, the first capstan (21) does not come into contact with the first pinch roller (11), and the first winding arm (49) does not slide. The guide groove (80) of the base (2) prevents the second take-up gear (52) from meshing with the take-up reel shaft gear (69).In such a state, the plunger (37) is energized. The lock lever is
(41) is rotated counterclockwise and the drive gear (30
) The locking end (40) of the lock lever (41) is not locked by the locking piece (46c) of the lock lever (41). Therefore, the drive gear (30) rotates and the gear in turn in turn auxiliary slide base (27).
) in the direction of arrow B. The drive gear (30
) passes the position shown in Figure 4, and the leaf switch (66), which had been turned on on the endless tape (70) side,
) is turned off and the power to the plunger (37) is stopped, the attraction force of the plunger (37) disappears and the lock lever (41) is moved clockwise by the biasing force of the spring (72). is rotated to Therefore, as mentioned above, as the auxiliary slide base (27) is slid in the direction of arrow B, the slide base (2) is also slid in the direction of arrow B, and the driving gear is moved to the position where the cassette tape is recorded (played). (30) is rotated, the locking piece (46b
) and the locking end (40) are locked, the drive gear (30) is stopped, and in this way the cassette tape recording state is directly brought from the stopped state.

There are times when it is desired to remotely play back and listen to a message from a caller recorded on a cassette tape as described above, but in such a case, first send a ringing signal, start up the telephone, and put the endless tape into playback mode. After that, it is necessary to rewind the cassette tape by transmitting a remote control signal, but in this invention, the plunger (37)
This is achieved by continuing to apply electricity to the reel until the unwinding state is reached. That is, when the endless tape shown in FIG. 4 is being played back, a remote control signal is sent to plunge
37), the locking piece (46b) and the locking upper end (40) are completely unlocked, and the drive gear (30) rotates a little and meshes with the first capstan gear (68). , the first
Rotate the capstan gear (68). Then, the engagement pin (34) moves from the innermost circumference to the outermost circumference of the groove (35), so that the auxiliary slide base (27) is slid together with the slide base (2) in the direction of arrow B. On the other hand, since the plunger (27) continues to be energized, the lock lever (41) remains rotated counterclockwise, and the base guide plate (60) continues to slide in the direction of arrow C. (2) is slid in the direction of arrow B, the pin (6) held on the slide base (2)
3) is guided by the guide groove (80) of the locking window (64) of the base guide plate (60) to prevent the slide base (2) from completely sliding in the second direction, as shown in FIG. At the same time, the second winding arm (53) is activated by the U-shaped spring (6
5> is allowed to rotate clockwise, so when the slide base (2) is slid in the direction of arrow B, the second
The pin (76) of the take-up arm (53) fits into the groove (44) and meshes the early spring take-up gear (57) with the reel shaft gear' (81) attached to the supply reel shaft (17). Therefore, the rotational force from the motor (23) is transmitted to the supply reel shaft (17) via the belt (26), idler (25), early spring removal gear (57), and reel shaft gear (81). ) in high-speed reverse rotation. Furthermore, as mentioned above, the slide base (2) is not completely slid in the second direction, so the second pinch roller (12) and the second capstan (22) are not pressed against each other, and the cassette tape is returned early (the second Figure 8).

When rewinding from a stopped state, the lock lever is activated by continuing to energize the plunger (37) in the same manner as described above.
(41) is rotated counterclockwise to release the lock between the locking piece (46a) and the locking end (40), and the drive gear (30)
is slightly rotated to mesh with the cab stan gear (36), and the drive gear (30) is subsequently rotated. As a result, the slide base (2> is slid in the direction of arrow A together with the auxiliary slide base (27>), but the lock lever (41)
At this point, the base guide plate (60) has completely slid in the direction of arrow C, and the pin (63) has reached the engagement portion (79) of the locking window (64).
> to prevent the movement of the slide base (2), the first capstan (2) is attached to the first pinch roller (11).
1> is not brought into pressure contact, and the unwinding state occurs in the same manner as described above (FIG. 8). In this state, the plunger (37)
Since the pin (63) continues to be energized, the pin (63) is locked to the locking portion (80) of the locking window (64) of the base guide plate (60), and the locking piece ( The fan-shaped locking surface (85> of the lock lever (41) hits the lock lever (46d), stopping and holding the drive gear (30), and the toothless portion (32) of the drive gear (30) engages with the first capstan gear. (68), it is held in the rewind state.

When the power supply to the plunger (37) is stopped, the lock lever (41) is rotated clockwise by the spring (72) so that the locking piece (46d) of the drive gear (30) and the locking surface (85) Release the engagement of the base guide plate (6
0) is returned in the direction of the arrow by the biasing force of the spring (78), and the pin (63) is attached to the engaging part (60) of the base guide plate (60).
80), the drive gear (30) becomes free, rotates slightly by the biasing force of the pressurizing spring (28), meshes with the carburetor gear (68), and locks the drive gear (30) at the locking end of the lock lever (41). (40) and the locking piece (46c
) to the locking position, slide base (2
) is slid to the stop position.

Finally, the operation of putting the cassette tape in a fast-forward state will be explained. First, when the endless tape is in the playback state, in order to bring it into the early spring removal state, the plunger (37) is energized until the cassette tape side contact piece of the leaf switch (66) is turned on. By energizing the plunger (37), the lock lever (41) rotates counterclockwise, releasing the lock between the locking end (40) and the locking piece (46b), and locking the drive gear (30). ) and rotate the first capstan gear (
68> and subsequently rotate the drive gear (30), the engagement pin (34) is moved from the outer circumference to the inner circumference of the groove (35), so the auxiliary slide base (27) moves in the direction of arrow B. The pressure spring (28) presses the drive pin (34) and moves the slide base (2) in the direction of arrow B.
Slide in the direction.

At this time, the lock lever (41) is rotated counterclockwise due to suction of the plunger (37), and the base guide plate (60) has completely slid in the direction of arrow C, so that the pin (63) is Guided by the guide groove (68) of the locking window (64) of the base guide plate (60), the slide base (2) moves to the 715th! :Restricted at l position. When the plunger (37) is de-energized, the lock lever (41) is rotated clockwise by the spring (72) together with the U-shaped spring (58), and the second winding arm (53) is rotated counterclockwise. Since it is rotated, the shaft (56
) is not fully fitted into the square hole (75) and becomes free, and the guide pin (76) is fitted into the groove (42>) of the auxiliary slide base (27), and the early spring removal gear (25) is connected to the idler gear (7).
7) and the idler gear (77) is meshed with the take-up reel shaft gear (74), so the rotational force of the motor (23) is transferred from the belt (26) to the idler (25), the early spring take-up gear (57), and the take-up reel shaft gear (74). The information is transmitted to the take-up reel shaft (16) via the idler gear (77) and the take-up reel shaft (16)
) Rotate the hub fitted to the cassette tape and remove the cassette tape early.

When fast-forwarding the cassette tape from a stopped state, by applying electricity until the contact piece on the cassette tape side of the leaf switch (66) is turned on, the endless tape can be fast-forwarded without operating, as in the case of rewinding. .

When the drive gear wheel 30) is rotated to a position where the auxiliary slide base (27) is slid and the early spring removal gear (57) is engaged with the idler gear (77), the locking piece (46) is rotated.
c) and the locking end (40) are locked and the toothless portion (32)
faces the first capstan gear (68), the drive gear (30) stops rotating and maintains the fast forward state.

To change from the fast forwarding state to the stopped state, the plunger (37) is energized for several milliseconds, and the lock lever (41) is rotated counterclockwise, causing the locking piece (46a) and the locking end (40) to rotate.
The drive gear (30) is rotated a little and meshed with the first capstan gear (68), and the drive gear (30) is disengaged from the drive gear (30).
0) continues to rotate. Then, the engagement pin (34) moves into the groove (3).
5) from the inner circumference to the outer circumference, the auxiliary slide base (27) slides in the direction of arrow A and returns the slide base (2) to the stop position.

The above operations are summarized as follows.

A. When the plunger (37) is energized from a stopped state, it is put into an endless tape running state, and by switching the electric circuit, it is put into a recording state or a playback state.

B. When the plunger (37) is energized from the stopped state or the endless tape running state until the endless tape side contact piece of the leaf switch (66) is turned from on to off, the cassette tape is brought into a constant speed running state and the electric circuit is switched. to enter recording or playback mode.

When the plunger (37) is energized from the C6 stopped state or the endless tape running state until the cassette tape side contact piece of the leaf switch (66) is turned on, the cassette tape is brought into a fast forward state.

D. When in the stopped state or in the endless tape running state, if the plunger (37) continues to be energized, the cassette tape will be rewound while the plunger (37) is energized.

Effects of the Invention As described above, the tape recorder operation switching device of the present invention can change the recording or playback state of the first tape or the second tape simply by changing the energization time to the plunger in the stopped state.
Since the recording or playback state of the tape can be selected, it is particularly suitable for answering machines.

[Brief explanation of drawings]

The figures all relate to the operation switching device for a tape recorder according to the present invention; Fig. 1 is a plan view of the whole, Fig. 2 is a back view of the whole, and Fig. 3 is a top view of the stopped state centered on the drive gear part. , FIG. 4 is a top view showing a state in which the first tape is running at a constant speed centering on the drive gear portion, and FIG. 5 is a top view showing a state in which the second tape is running at a constant speed centering around the drive gear portion.
FIG. 6 is an overall top view showing the second tape running at a constant speed;
FIG. 7 is a top view of the entirety showing the second tape fast-forwarding state, FIG. 8 is a top view of the whole showing the second tape rewinding state, and FIG.
The figure is a partial plan view showing the non-suction state of plunge ~-.
Figure 0 is a partial plan view showing the suction state of the plunge ~-.
FIG. 1 is a plan view of the main part showing the suction state of the plunger. (1)...Chassis, (2)...Slide base,
(3)...First recording/playback head, (9)...Second recording/playback head, (11)(12)...First and second pinch rollers, (13)...Engagement bin ,(21)(
22)...First and second capstans, (27)...
・Auxiliary slide base, (28)...Pressure spring, (30)...Drive gear, (36)...First
Capsun gear, (37)... Plunger, (4
1)...Lock lever-1 (60)...Base guide plate. Applicant: Sanyo Electric Co., Ltd. and one other agent Patent attorney Takuji Nishino and one other person Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 7 7'/ Figure 8 Figure 9 D Figure 10

Claims (1)

[Claims] (1) It has first and second recording and playback heads that are installed with the gap surfaces in different directions and record or playback on the first and second tapes, respectively, and A slide base that is slid in a second direction, first and second pinch rollers that are moved in relation to the slide base, and first and second pinch rollers that are provided opposite to the first and second pinch rollers, respectively. a capstan, a drive gear that is selectively connected to a drive mechanism such as a motor and rotates to slide the slide base; and a lock that rotates only while the plunger is energized to release the rotation prevention force of the drive gear. It consists of a lever and a base guide plate that is moved by the lock lever and forcibly prevents the slide base from moving in the first direction, and the slide base is slid from a stopped state in the first direction by a drive gear and The first pinch roller presses against the first capstan via the first tape to record or play back the first tape, and the drive gear further rotates and the slide base slides in the second direction, causing the second pinch roller to press against the first capstan through the first tape.
The pinch roller presses the second capstan through the second tape to record or play back the second tape, and the base guide plate prevents the slide base from sliding in the first direction, so that the pinch roller directly presses the second capstan from the stopped state. An operation switching device for a tape recorder, characterized in that it enables tape recording or playback.