JPS6258445A - Normal/reverse switching device of reverse recording and reproducing device - Google Patents

Abstract

PURPOSE:To store mechanically the shake direction in the reproducing (recording) mode preceding the stop mode in a switching lever by using U-shaped springs placed in both sides of a part to be pressed of the switching lever. CONSTITUTION:When a driving rod 60 is moved back by switching to the stop mode, a pair of control parts 66 and 67 of the driving rod 60 are brought into contact with a pair of parts to be controlled by a switching lever 73 simultaneously to hold the switching lever 73 in the neutral position, and the shake direction in the reproducing (recording) mode preceding the stop mode is stored mechanically in the switching lever because a part 75 to be pressed of the switching lever is pressed from one side or the other by one end part or the other of a spring 69. Consequently, normal running or reverse running before the stop mode is restored automatically when the mode is switched to the reproducing (recording) mode. Since one end part or the other of one approximately U-shaped spring 69 is pressed from the inside to the outside by a spring pressing part of a switching rod and the switching lever 73 is pressed and shaken by the other end part or one end part of the spring 69, the mechanical storing function is attained with simple structure.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example GI Outline of operation of tape running drive system and tape recorder Explanation (Figs. 1 to 3) 02 Description of the normal/reverse switching device which is the main part of the present invention (Figs. 1, 4 to 6C) G. Description of the head support mechanism (Figs. 7 to 6C) (Fig. 8B) Explanation of the G4 + trigger mechanism (Fig. 1, Fig. 9A to Fig. 10) Explanation of the G5 shaft-off mechanism (Fig. 1, Fig. 11A to Fig. 11D) Explanation of the G6 mode switching mechanism (Fig. 1 Figures, Figures 11A to 1
(Fig. 1D) Explanation of G, normal, reverse switching means (Fig. 1,
1A to 11D) H Effect of the Invention A Industrial Field of Application The present invention is most suitable for application to, for example, a normal/reverse switching device of a tape recorder, in which intermediate rotation is achieved by swinging a switching lever. This invention relates to a normal/reverse switching device for a reverse type recording/reproducing apparatus, which selectively engages one of a pair of reel stands to selectively switch the running of the tape between normal running and reverse running.

B. Summary of the Invention The present invention selectively engages an intermediate rotating body with either one of a pair of reel stands by swinging a switching lever, thereby selectively switching tape running between normal running and reverse running. In the normal/reverse switching device of the reverse type recording/playback device, when the drive rod is moved forward by switching to the playback (recording) mode and the switching rod is moved to the normal position or reverse position, the switching lever cannot be moved. The intermediate rotating body is allowed to swing freely, and the other end or one end of the substantially U-shaped spring is pressed to swing the switching lever, and the intermediate rotating body is pressed into engagement with one or the other of the pair of reel stands, and then stopped. When the drive rod is moved back by switching to mode,
By restricting the swinging of the switching lever and holding the switching lever in the neutral position against the spring, even if the switching lever is returned to the neutral position due to switching to stop mode, the switching lever will not stop. Playback (recording) before mode
The swing direction in the mode can be mechanically memorized with an extremely simple structure.

C. Conventional technology Conventionally, normal/reverse switching devices such as reverse-type tape recorders have been configured to be swingable, and the swinging allows the intermediate rotating body to selectively engage one of a pair of reel stands. a switching lever that moves back and forth to the forward position when switching to stop mode, and a reciprocating drive rod that moves back and forth to the forward position when switching to playback (recording) mode, and a normal position and reverse position. A switching rod is provided that is reciprocated between the two and moved to the normal position by the return movement of the drive rod, and a limiter means such as a spring that presses the intermediate rotating body against the pair of reel stands, and the drive rod is moved back and forth. As a result, the switching lever is swung to one side in response to the switching rod being moved to the normal position, and this swiveling causes the intermediate rotating body to selectively engage one of the pair of reel stands, and the limiter means engages the switching lever in one direction. The intermediate rotating body is configured to be crimped onto one of the pair of reel stands, and in this state, by moving the switching rod to the reverse position, the switching lever is swung to the other side, and this swinging causes the intermediate rotating body to be crimped onto one of the pair of reel stands. There was one in which tape running was switched from normal running to reverse running by selectively engaging the other side of the reel stand by pressure. .

D Problems to be Solved by the Invention However, in the past, when switching to the stop mode, the drive rod was moved back to the return position and the switching lever was moved back to the neutral position, the switching lever was moved back to the neutral position. was moved to the normal position.

Therefore, if you switch the tape running from reverse running playback (recording) mode to stop mode, the next time you switch to playback (recording) mode, it will not return to the reverse running that was before stop mode, but will return to normal running. Put it away. For this reason,
It was extremely inconvenient to use the device because it was necessary to switch to the playback (recording) mode and then switch to reverse driving again.

Note that if a pause mechanism is provided to pause the playback (recording) mode, if the pause is released, the vehicle will return to normal or reverse driving before the pause, but such a pause mechanism has a significantly The problem was becoming more complicated.

Conventionally, the switching lever is swung by the movement of the switching rod, and the intermediate rotating body is pressed against the pair of reel stands by the limiter spring. It is necessary to provide two limiter springs along the direction in which the reel base is engaged with the reel base, which makes the structure extremely complicated, and there is also the problem that it is difficult to equalize the pressure applied to the pair of reel bases. Ta.

Therefore, even if the switching lever is moved back to the neutral position by switching to the stop mode, the present invention mechanically controls the swinging direction of the switching lever in the playback (recording) mode before the stop mode using an extremely simple structure. This allows it to be memorized.

E. Means for Solving the Problems The present invention has a pressed part and a pair of regulated parts and is configured to be swingable, and by the swinging, the intermediate rotating body is selected as one of the pair of reel stands. a switching lever for selectively switching the running of the tape between normal running and reverse running while maintaining the same position; and a pair of regulating parts that are brought into contact with the pair of regulated parts at the same time; A reciprocally movable drive rod that is moved back to the backward movement position and also moved back to the forward movement position by switching to the playback (recording) mode; It has a substantially U-shaped spring located on both sides of the pressed part of the switching lever, and a spring pressing part inserted between both ends of this spring, and is substantially orthogonal to the drive rod to be in the normal position and reverse position. and a switching rod that reciprocates between At the same time, the spring pressing portion presses one end or the other end of the spring from the inside to the outside, and the other end or one end of the spring pushes the pressed portion of the switching lever from one side or the other. When pressed from the side, the switching lever is swung to one side or the other by the spring force at that time, and the intermediate rotating body is pressed into engagement with one or the other of the two pairs of reel stands, and the driving In the state in which the rod is moved back, the pair of restricting portions are brought into contact with the pair of restricted portions at the same time, and the switching lever is held at a neutral position against the spring.

F Function The present invention provides that when the drive rod is moved forward due to switching to the playback (recording) mode and the switching rod is moved to the normal position or the reverse position, the pair of regulating portions of the driving rod are in contact with the pair of switching levers. Since it is separated from the regulated part and the switching lever can swing freely, the switching lever is swung to one side or the other by the spring force, and the intermediate rotating body is crimped to one or the other of the pair of reel stands. The tape is then run normally or in reverse. On the other hand, when the drive rod is moved back due to switching to the stop mode, the pair of regulating parts of the drive rod simultaneously abuts the pair of restricted parts of the switching lever, and the switching lever is held at the neutral position. At this time, since the pressed part of the switching lever is pressed from one side or the other by one end or the other end of the spring, the switching lever will not be able to swing in the playback (recording) mode before the stop mode. The direction is memorized mechanically. Therefore, when switching to the playback (recording) mode next time, the normal running or reverse running before the stop mode is automatically returned.

In addition, the spring pressing part of the switching rod presses one end or the other end of one substantially U-shaped spring from the inside to the outside, and the other end or one end of the spring presses the switching lever to make it swing. Therefore, the above-mentioned mechanical memory function can be obtained with an extremely simple structure. Moreover, since the U-shaped spring can substantially match the spring force at the normal position and the reverse position of the switching rod, it is possible to evenly press the intermediate rotating body against the pair of reel stands.

G. Embodiment Hereinafter, an embodiment in which the present invention is applied to an auto-reverse compact tape recorder using a compact cassette will be described with reference to the drawings.

G. First, the tape running drive system and the general operation of the tape recorder will be explained with reference to FIGS. 1 to 3.

FIG. 2 shows the tape running drive system of this tape recorder, in which a cassette 4 containing a magnetic tape 3 wound around a pair of left and right reel hubs 1 and 2 is mounted on a chassis 6.
It is mounted horizontally on the top of the

At the top of the chassis 6, a pair of left and right reel stands 7.8, a capstan 9.10, a pinch roller 11.12, a magnetic head 13, etc. are provided, and the reel hubs 1.8 of the cassette 4 mounted on the chassis 6 are provided. 2 is engaged with the reel stand 7.8, and the magnetic tape 3 is passed onto the capstan 9.10 and the magnetic head 13. In addition, on the front of the chassis 6, there are a playback (record) button 16, a stop button 17, and a fast forward button 18.
, a rewind button 19, and other mode switching buttons are attached.

Next, as shown in FIGS. 2 and 3, at the bottom of the chassis 6, there is a flat and thin motor 21 installed coaxially with the reel stand 8, and a cap fixed to the lower end of the capstan 9 and 10. A capstan pulley 22.23 which also serves as a stand flywheel, an intermediate pulley 24 attached to an approximately intermediate position of the reel stand 7.8, and a reversing pulley 25 disposed on one side of the capstan pulley 23 are provided. . And each of these pulleys 22, 23, 24, 25 and motor 2
An elastic belt 27 is connected to the first drive boob IJ26.
is wrapped around it.

On the other hand, the reel stand 7 attached to the upper part of the chassis 6
．． A reel stand gear 30.31 is formed on the outer periphery of the reel stand 7.8, and an FR first idle gear 33 and F
An R second idle gear 34 is provided. Further, an NR file gear 35 and an intermediate gear 36 for normal running and reverse running of the magnetic tape 3 are provided in the middle of the reel stand 7.8. Further, attached to the lower part of the chassis 6 are a partially toothed gear 37 for switching the magnetic tape 3 between normal running and reverse running, and a drive gear 38 for intermittently rotationally driving the gear.

This tape recorder has a playback (recording) button 16,
When the fast forward button 18 and the two rewind ports 19 are pressed, a power switch (not shown) is turned on, the motor 21 is rotated at a constant speed, and its drive pulley 26 is driven to rotate in the direction of arrow a in FIG.
The belt 27 rotates the intermediate pulley 24 and capstan pulleys 22 and 23 in the directions of arrows A, C, and D, respectively.

When the fast forward button 18 is pressed, a fast forward/rewind switching mechanism (not shown) causes the FR drive gear 39 formed on the outer periphery of the intermediate pulley 24 to move to the PR first idle position as shown by the solid line in FIG. While the gear 33 is engaged, this F
The FR second idle gear 33 is always engaged with the R first idle gear 33.
Idle gear 34 is the reel stand gear 3 of one reel stand 7
0 selectively engaged. As a result, one reel stand 7 is driven to rotate at high speed in the direction of arrow e, and a fast-forward mode is entered in which the magnetic tape 3 is run in the direction of arrow f and wound around one reel hub 1 at high speed.

On the other hand, when the rewind button 19 is pressed, the FR first idle gear 33 is selectively engaged with the FR drive gear 39 and the reel stand gear 31 of the other reel stand 8, as shown by the dashed line in FIG. Ru. As a result, the other reel stand 8 is driven to rotate at high speed in the direction of arrow g, and a rewinding mode is entered in which the magnetic tape 3 is run in the direction of arrow f' and wound onto the other reel hub 2 at high speed.

Next, when the playback (record) button 16 is pressed, the NR drive gear 40 is installed on the same axis as the intermediate pulley 24 and is driven to rotate in the same direction as the intermediate pulley IJ 24 via a torque limiter (not shown). The NR file gear 35, which is always engaged with the reel base gear 30 of one reel base 7, is connected to the intermediate gear 36, which is always engaged with the reel base gear 30 of one reel base 7, by the normal/reverse switching device 45, which will be described later, as shown by the solid line in FIG. selectively engaged as shown. At the same time, the magnetic head 13 is brought into contact with the magnetic tape 3 by a head support mechanism 46, which will be described later, and the pinch roller 11 is pressed against one capstan 9. As a result, one reel stand 7 is rotationally driven in the direction of arrow e, and the magnetic tape 3 is rotated in the direction of arrow f.
The magnetic head 13 enters a normal reproduction (recording) mode in which the magnetic head 13 travels in the direction and is wound around one of the roller hubs 1, and normal reproduction (recording) is performed by the magnetic head 13.

When the normal running of the magnetic tape 3 reaches the end of the tape, a trigger mechanism 47 (described later) is activated by a drive gear 38 which is constantly rotated integrally with the intermediate gear 42 by a drive gear 41 that is coaxial with the intermediate pulley 24. As a result of the operation, the partially toothed gear 37 is selectively engaged, and the partially toothed gear 37 is driven half a rotation. Then, the normal/reverse switching device 45 is driven to switch to reverse travel. By this switching, the NR file gear 35 is selectively engaged with the reel stand gear 31 of the other reel stand 8 as shown by the dashed line in FIG.
The pinch roller 12 is pressed onto the roller 0. As a result, the other reel stand 8 is rotationally driven in the direction of arrow g, the magnetic tape 3 is run in the direction of arrow f' and is wound on the other reel hub 2 (S!') mode, which enters the reverse playback (S!') mode, and the magnetic head Reverse playback (recording) is performed by 13.

Note that if you press the stop button 17 in fast forward, rewind, or playback (recording) mode, the power switch is turned off and the motor 21
The rotation of FR is stopped, and as shown in FIG.
The first and second idle gears 33, 34 or the NR file gear 35 are returned to the neutral position and enter the stop mode.

By the way, this tape recorder is configured so that when the magnetic tape 3 reaches the end of the tape while running in reverse, a shaft-off mechanism 48 (described later) performs a shaft-off operation and automatically enters a stop mode. Further, this tape recorder has a mode switching mechanism 49 to be described later, which allows the magnetic tape 3 to be switched between normal running and reverse running, and a reciprocating mode (shutoff mode) in which the magnetic tape 3 is stopped after normal running and then reverse running. It is configured such that it can be selectively switched to a continuous mode (repeat mode) in which the vehicle is run repeatedly and continuously. Further, this tape recorder has a normal/reverse switching means 50 which will be described later.
The magnetic tape 3 is configured to be selectively switched between normal running and reverse running at any time.

02 Next, details of the normal/reverse switching device 45 will be explained with reference to FIGS. 1 and 4 to 6C.

First, as shown in FIG. 4, the playback (recording) button 16 is fixed to one end of a playback (recording) operating rod 53. As shown in FIG. The operating rod 53 is configured to be able to reciprocate in the arrow and h' directions at the lower part of the chassis 6, and a connecting lever 55 is connected to the other end by a pin 54. The connecting lever 55 is rotatably supported by a shaft 56 at the upper part of the chassis 6 in the directions of arrows i and i', and has a pin 57 at its free end. The connecting lever 55 is urged to rotate in the direction of arrow i' by a return spring 58 stretched between it and the chassis 6.

Next, a drive rod 60 is disposed at the bottom of the chassis 6 in the front-rear direction. This drive rod 60 has a substantially L-shape, and is configured to be able to reciprocate in the directions of arrows j and j' by having an elongated hole 62 guided by the rotating shaft 61 of the drive gear 38. A pin 57 of the connecting lever 55 is engaged with a U groove 63 formed at one end of the drive rod 60, and a tension spring 64 is stretched between the pin 57 and the drive rod 60. Further, the other end side 60a of the drive rod 60 is formed in a substantially symmetrical shape on the left and right sides, and a pair of right and left cone restricting portions 66 made of protrusions are provided on both sides of a notch 65 formed on the other end side 60a.
．． 67 are provided. Further, as shown in FIGS. 5 to 6C, a shaft 68 is provided at the center of the other end side 60a of the drive rod 60.
is crimped, and a substantially U-shaped linear spring 69 is attached to this shaft 68. And this spring 69
is fitted onto the shaft 68 at the central portion 69c so that both ends 69a and 69b protrude toward the notch 65, and is configured to be swingable in the directions of arrows k and '. Furthermore, driving rod 6
A pair of drive pins 70 and 71 are fixed to the other end 69a of the chassis 6 so as to protrude from the top of the chassis 6.

Next, as shown in FIGS. 5 to 6C, a switching lever 73 is provided at the bottom of the chassis 6 and in the middle of the reel stand 7.8. This switching lever 73 is fitted into a circular hole 74 formed in the chassis 6 and is configured to be swingable in the directions of arrows l and l'' on the outer periphery of the NR drive gear 40. 35 is rotatably supported.

At the other end of the switching lever 73, there is a pressed portion 75 formed of a projecting piece, and a pair of left and right restricted portions 76 on both sides of the pressed portion 75.
77 are formed laterally symmetrically. The other end of the switching lever 73 is located within the notch 65 of the drive rod 60, and the pair of restricted portions 76.77 are connected to the pair of restricted portions 66.77.
67. Therefore, both ends 69a and 69b of the spring 69 are located on both sides of the pressed portion 75 of the switching lever 73. Note that the NR idle gear 35, which is pivotally supported by the switching lever 73, and the NR drive gear 40 are always engaged.

Next, as shown in FIG. 4, a switching rod 80 is arranged between the chassis 6 and the other end 60a of the driving rod 60 so as to be substantially perpendicular to the driving rod 60. As shown in FIG. This switching rod 80 can be moved between the normal position N shown by the solid line and the reverse position R shown by the dashed line by having the elongated hole 83.84 guided by the guide shaft 81.82 which also serves as a bearing for the capstan 9.10. It is configured to be able to freely reciprocate in the directions of arrows m and m'. A spring pressing portion 85 consisting of a protrusion is provided approximately at the center of the switching rod 80, and this spring pressing portion 85 is inserted between the ends 69a and 69b of the spring 69. Further, a protrusion 86 extending toward the partially toothed gear 37 is provided at one end of the switching rod 80, and a cam hole 87 formed in this protrusion 86 is integrally formed on the upper surface of the partially toothed gear 37. It is engaged with pin 89. A pair of regulating pins 91 and 92 are fixed to the switching rod 80 so as to protrude from the upper part of the chassis 6.

Next, the operation of the normal/reverse switching device 45 configured as described above will be explained.

First, in the stop mode shown by the dashed line in FIG. 4, the connecting lever 55 is moved back in the direction of the arrow i'' by the return spring 58, so that the playback (recording) operating rod 53 is moved back in the direction of the arrow h'. At the same time, the drive rod 60 is pressed by the pin 57 and is moved back to the return position in the direction of the arrow j''. Also, in this stop mode, the switching rod 80 is at the normal position N shown by the solid line.
and a reverse position R indicated by a dashed line.

Here, as shown by the solid line in FIG. 6A, when the switching rod 80 is moved to the normal position N, the spring pressing portion 85 of the switching rod 80 presses one end 69a of the spring 69 from the inside to the outside. Therefore, the spring 69 is swung in the direction indicated by the arrow as shown by the solid line, and the other end 69b presses the pressed portion 75 of the switching lever 73 from one side, and the switching lever 73 is moved in the direction indicated by the arrow l.
A swinging force in the direction is applied. At this time, the drive rod 60 is being moved back in the direction of the arrow j'', and this drive rod 60
The pair of restricting portions 66 and 67 are simultaneously brought into contact with the pair of restricted portions 76 and 77 of the switching lever 73. Therefore, the arrow on the switching lever 73! The switching lever 73 is held at the neutral position against the spring 69.

On the other hand, when the switching rod 80 is moved to the reverse position R indicated by the dashed line, the spring pressing part 85 of the switching rod 80 presses the other end 69b of the spring 69 from the inside to the outside, so that the spring 69 is held at one point. As shown by the chain line, it is swung in the direction of the arrow ', and its one end 69a presses the pressed portion 75 of the switching lever 73 from the other side, and a swinging force is applied to the switching lever 73 in the direction of the arrow β'. Ru. However, the return movement of the drive rod 60 in the direction of the arrow j' restricts the swinging of the switching lever 73 in the direction of the arrow β'.
is held in a neutral position against the

Next, when the playback (recording) button 16 is pressed in FIG. Then, the drive rod 60 is moved forward to the forward position in the direction of arrow j via the tension spring 64.

Note that the regeneration operating rod 53 is in the forward position, and its lock claw 53a is engaged with a lock portion 94 of a well-known lock plate 94 (see FIG. 11A).
a and is locked, whereby the drive rod 60 is also locked in the forward movement position. Note that the tension spring 64 acts as a limiter spring at the forward movement position of the force section 1 movable rod 60.

Next, as described above, the driving rod 60 is moved forward in the direction of the arrow j by switching to the playback (recording) mode, and the state in which the switching rod 80 is moved to the normal position N at this time is 6B.
As shown in the figure. That is, by the forward movement of the drive rod 60, the pair of restricting portions 66,67 are simultaneously separated from the pair of restricted portions 76,77 of the switching lever 73. At the same time, the spring 69 is also moved forward (advanced toward the switching lever 73 side), so one end 69a of the spring 69 is relatively pressed by the spring pressing portion 85 of the switching rod 8o, and the spring 69 is Further, without being swung in the direction of the arrow, the other end 69b presses the pressed portion 75 of the switching lever 73 from one side. As a result, the restriction on the swinging of the switching lever 73 is released, and the spring force of the spring 69 is further applied, and the switching lever 73 moves to the direction indicated by the arrow. NR file gear 35 is engaged with intermediate gear 36. The spring 69 exerts a limiter spring function to generate a pressure force, and the pressure force causes the NR file gear 35 to be pressure-bonded to the intermediate gear 36.

Then, the rotation of the NR drive gear 40 in the direction of the arrow A is transmitted to the reel stand gear 30 via the NR file gear 35 and the intermediate gear 36, and the reel stand 7 is rotationally driven in the direction of the arrow E to enter the normal playback (recording) mode. become.

When the normal running of the magnetic tape 3 reaches the end of the tape in the normal playback (recording) mode described above, the drive rod 6
Stopping of the rotation of the reel stand 7 is detected by a detector 96 such as an optical sensor placed in the elongated hole 95 provided at the reel stand 7. Then, as shown in FIG. 4, the partially toothed gear 37 is driven half a rotation, and due to the cam action between the drive pin 89 of the partially toothed gear 37 and the cam hole 87 of the switching rod 8o, the switching rod 8o is moved in the direction of arrow m'. is driven from the normal position N to the reverse position R. When the switching rod 80 is moved to the reverse position R in the direction of arrow m' as shown in FIGS. 6B to 6C, the spring pressing portion 85 of the switching rod 8o is pressed against the spring 69.
The state is changed from a state in which one end 69a is pressed to a state in which the other end 69b is pressed. As a result, the spring 69 is swung in the direction of the arrow ', and one end 69a of the spring 69 presses the pressed portion 75 of the switching lever 73 from the other side.

At this time, since the drive rod 6o is moved forward in the direction of the arrow j in the playback (recording) mode, the swinging of the switching lever 73 is not restricted, and the switching lever 73 is swung in the direction of the arrow j'. The NR file gear 35 is engaged with the reel base gear 31. Then, the spring 69 exerts a limiter spring function to generate a crimping force, and the NR file gear 35 is crimped to the reel base gear 31 by this crimping force. and NR drive gear 4
The rotation in the direction of the arrow .degree. is transmitted to the reel stand gear 31 via the NR file gear 35, and the reel stand 8 is rotationally driven in the direction of the arrow g to enter the reverse play mode.

In addition, in the above-mentioned reverse playback (recording) mode, the switching rod 80
is driven in the direction of arrow m and moved from the reverse position R to the normal position N, the switching lever 73 is again swung in the direction of arrow l as shown in FIG. 6B, and normal playback (recording) is started.
mode. In this way, the running of the magnetic tape 3 can be selectively switched between normal running and reverse running only by reciprocating the switching rod 80.

Next, select the normal playback (recording) mode shown in Figure 6B or the
When the reverse playback (recording) mode shown in Fig. C is switched to the stop mode by operating the stop button 17 or operating the shaft off, the drive rod 60 is moved back in the direction of arrow j' as shown in Fig. 6A. As described above, the switching lever 73 is held at the neutral position against the spring 69. However, at this time, the spring 69 is moved back as shown by the solid line when the switch to the stop mode is performed in the normal playback (recording) mode, and as shown by the dashed-dotted line when the switch is made in the reverse playback (recording) mode. . Therefore, as described above, the switching lever 73 is held at the neutral position with a swinging force applied in the direction of the arrow l or p'. Therefore, in this normal/reverse switching device 45, the normal or reverse reproduction (recording) mode before the stop mode is mechanically memorized by the normal position N or reverse position R of the switching rod 80 and the spring 69. It exhibits a pause function similar to the pause mechanism, and then when switching to playback (recording) mode, normal running (Fig. 6B) or reverse running (Fig. 6B) before the stop mode is performed.
(Fig. 6C) will be automatically returned.

Further, in this normal/reverse switching device 45, the spring pressing portion 85 of the switching rod 80 has one substantially U-shaped spring 69.
The other end 69b or one end 69a of the spring 69 is pressed by pressing the one end 69a or the other end 69b from the inside to the outside.
Since the switching lever 73 is pressed and swung, the switching lever 8
0 normal position N and reverse position? The spring forces in IfR and IfR are exerted under the same conditions, and the NR idle gear 35 is evenly pressed onto the intermediate gear 36 and the reel stand gear 31.

01 Next, details of the head support mechanism 46 will be explained with reference to FIGS. 7 to 8B.

First, the magnetic head 13 and the pinch rollers 11 and 12
is attached to a cassette holder 98 rotatably attached to the chassis 6. That is, this cassette holder 9
8, the head arm 100 is connected by the shaft 99 to the arrows n and n.
A magnetic head 13 is attached to this head arm 100. The tip 100a of the head arm 100 extends to the front of one of the drive pins 70 of the drive rod 60.
A protrusion 101 is provided at a. Furthermore, the pinch rollers 11.12 are rotatably supported by pinch roller levers 102.103.
2.103 by axis 104.99 arrows 0 and 0',
It is pivotably supported in the p and p' directions. Pinch roller levers 102, 103 are moved by arrows 0', 105, 106 wound around shaft 104, 99.
It is biased backward in the p' direction. Further, another torsion spring 107.108 is wound around the shaft 104.99, and the tips 107a, 108a of these tear springs 107.108 extend to the front of the pair of drive rods 70.71 of the drive rod 60. and is locked by locking portions 109 and 110 formed at the tips of pinch roller levers 102 and 103. Note that the tip 107a of one torsion spring 107 is connected to the helad arm 1.
It is in contact with the protrusion 101 of 00 from the front. Furthermore, approximately V-shaped notches 111 and 112 are formed on the tip side of the pinch roller lever 102 and 103 in correspondence with the pair of regulating pins 91 and 92 of the switching rod 80.

Next, the operation of the head support mechanism 46 configured as described above will be explained.

First, in the stop mode, the drive rod 60 is moved back, so the pair of drive bins 70 and 71 of the drive rod 60 are also moved toward the chassis 6.
It is moved backward within a pair of U grooves 114 and 115 formed in FIGS. 8A and 8B as shown by the dashed-dotted lines. This causes the pinch roller levers 102, 103 to be moved by the torsion springs 105.
At 106, the pinch rollers 11, 12 are rotated in the directions of arrows 0', p', and both the pinch rollers 11, 12 are separated from the capstan 9, 10.

At the same time, the tip 107a of the torsion spring 107 presses the protrusion 101 of the head arm 100, so the head arm 100 is also moved back in the direction of arrow n', and the magnetic head 1
3 is spaced apart from the magnetic tape 3.

Next, when the switching rod 80 is moved to the normal position N as shown in FIG. .71 is moved forward (forward) within the pair of U grooves 114 and 115, and the tip 10 of the torsion spring 107 and 108
7a and 108a are pressed. At this time, since the switching rod 80 has been moved to the normal position N, the pair of regulating pins 91.92 of the switching rod 80 are also moved within the pair of elongated holes 116, 117 provided in the chassis 6, and one The regulation pin 91 is located in front of the notch 111 of the pinch roller lever 102, and the other regulation pin 92 is located in front of the notch 111 of the pinch roller lever 102.
It comes off from the notch 112 of 03. Therefore, only the pinch roller lever 102 is moved forward in the direction of arrow 0, and the pinch roller 11 is pressed against the capstan 9. The pinch roller lever 103 is regulated by the regulating pin 92 and held in a backward motion state in the direction of arrow p', and the pinch roller 12 is spaced apart from the capstan 10.

Note that one drive bin 70 is located at the tip 1 of the helad arm 100.
Since ota is directly pressed, the head arm 100 is moved forward in the direction of arrow n, and the magnetic head 13 comes into contact with the magnetic tape 3.

Next, when the switching rod 80 is moved to the reverse position R as shown in FIG.
．． 117. Then, one regulating pin 91
is removed from the notch 111 of the pinch roller lever 102, restricts forward movement of the pinch roller lever 102 in the direction of arrow O, and the pinch roller 11 is separated from the capstan 9. Then, the other regulating pin 92 enters into the notch 112 of the pinch roller lever 103, the pinch roller lever 103 is moved forward in the direction of arrow p, and the pinch roller 12 is pressed against the capstan 10.

As described above, by selectively moving the switching rod 80 between the normal position N and the reverse position R, the pinch roller 11.12 is selectively pressed against and separated from the capstan 9.10. Note that the torsion springs 107, 108 serve as limiter springs that press the pinch roller 11, 12 against the capstan 9, 10. At this time, in the forward movement state of the drive rod 60, the tips 107a, 108 of the torsion springs 107, -108
Since a is pressed together, the pair of regulating pins 9192
The reciprocating motion of the pinch roller levers 102, 103 can be smoothly switched only by regulating and releasing the regulation of the pinch roller levers 102, 103.

04 Next, details of the trigger mechanism 47 will be explained with reference to FIGS. 1 and 9A to 10.

This trigger mechanism 47 applies an initial mechanical rotational force to the partially toothed gear 37 that drives the switching rod 80 between the normal position N and the reverse position R.

First, in the partially toothed gear 37, the partially toothed section 120 in the normal position and the partially toothed section 121 in the reverse position are formed so as to be offset by 180 degrees from each other. A lock pawl 122 in the normal position and a lock pawl 1 in the reverse position, each consisting of a protrusion, are located near the
23 are integrally molded. Further, on the lower surface of the partially toothed gear 37, both lock pawls 122 and 123, a normal position pressed portion 124 and a reverse position pressed portion 125, each consisting of a protrusion offset by approximately 90 inches, are integrally molded. The pressed parts 124 and 125 have a substantially triangular shape, and slopes 124a and 125a are formed respectively.

Next, in the lower part of the chassis 6 and near the toothless gear 37, a trigger lever 127 is pivotally supported by a shaft 128 provided on the chassis 6 so as to be swingable in the direction of arrows q and q'. A return spring 129 stretched between the two is biased to move forward in the direction of arrow q. This trigger lever 1
27, a lock arm portion 130 to which the lock claws 122 and 123 are brought into contact, an elastic arm portion 131 having elasticity for pressing the pressed portion 124 and 125, and a holding arm portion 132 are integrally made of synthetic resin. It is molded into. The lock arm part 130 and the elastic arm part 131 are connected to the lock claw 122 and the pressed part 124 in the normal position.
The partially toothed gear 3 is formed in a substantially dogleg shape so as to correspond to the lock pawl 123 and the pressed portion 125 in the reverse position.
It is inserted into the bottom side of 7. Note that the elastic arm portion 131
is curved into an arc. and holding arm portion 132
A movable iron core 134 is swingably attached to the tip of the shaft 133 by means of a shaft 133. In addition, as shown in FIG. 10, the shaft 13
3 has a barrel shape, which allows the movable iron core 134
is equipped with an automatic alignment function. Further, a bottle 135 is integrally molded at the tip of the holding arm portion 132, and this bottle 135 is inserted into a hole 136 formed in the chassis 6. At the bottom of the chassis 6, there is a movable iron core adsorption type solenoid 138 that adsorbs the movable iron core 134 and holds the trigger lever 127 in a reciprocating state in the direction of arrow q'.
is located.

Next, the operation of the trigger mechanism 47 configured as described above will be explained.

First, FIG. 9A shows the normal playback (recording) mode. That is, the movable iron core 134 of the holding arm portion 132 is attracted to the magnet 138a of the solenoid 138, so that the trigger lever 127 is held in a double-motion state in the direction of arrow q'. As a result, the lock pawl 122 of the partially toothed gear 37 at the normal position is engaged with the tip of the lock arm portion 130, and the partially toothed gear 37 is locked at the normal position.

Therefore, the toothless portion 120 of the toothless gear 37 at the normal position is opposed to the drive gear 38, and the magnetic tape 3 is running normally.

Then, when the normal running reaches the end of the tape and the detector 96 shown in FIG. 4 detects that the reel stand 7 has stopped rotating, the solenoid 138 is instantaneously energized. Then, as shown in FIG. 9B, the magnet 138a
A repulsive force of the movable iron core 134 is generated, the adsorption of the movable iron core 134 is released, and the trigger lever 127 returns to the spring 129.
It is moved forward in the direction of arrow q. This forward movement releases the engagement between the lock arm portion 130 and the lock pawl 122, and the partially toothed gear 37 is unlocked. At the same time, the tip of the elastic arm 131 presses the pressed part 12 at the normal position.
The slope 124a of No. 4 is pressed, and this causes the partially toothed gear 3
7 is given a mechanical initial rotational force in the direction of arrow r,
The partially toothed gear 37 is engaged with the drive gear 38. Note that when the pin 135 of the holding arm portion 132 comes into contact with the side surface of the hole 136, the forward movement of the trigger lever 127 in the direction of the arrow q is stopped.

Since the drive gear 38 is always rotationally driven in the direction of the arrow S by the rotation of the intermediate pulley 24 in the direction of the arrow S via the drive gear 41 and the intermediate gear 42, the drive gear 38 is driven as shown in FIG. 9C. The partially toothed gear 37 is indicated by the arrow r.
When the partially toothed gear 37 is driven to rotate approximately 90 inches, the lock pawl 122 is moved along the inner circumferential surface 131a of the elastic arm portion 131, so that the elastic arm portion 131 is gradually pressed against its elasticity, the trigger lever 127 is moved back in the direction of arrow q' against the return spring 129, and the movable iron core 134 is again attracted to the magnet 138a of the solenoid 138. Since the iron core 134 is attached to the holding arm part 132 by a barrel-shaped shaft 133 with a self-centering function,
Trigger lever 127 molding error and trigger lever 127c
! =7 Even if there is some installation error with Lenoid 138,
The movable iron core 134 is reliably attracted to the solenoid 138.

Subsequently, the toothless gear 37 is rotationally driven in the direction of the arrow r, and when it has been driven half a rotation as shown in FIG. The lock pawl 123 is engaged with the tip of the lock arm portion 130, and the partially toothed gear 37 is locked in the reverse position. In addition, this time the elastic arm part 13
The pressed portion 125 in the reverse position is located near the tip of the tip.

When the toothless gear 37 is driven half a rotation as described above, the switching rod 80 is rotated by the cam action between the drive pin 89 of the toothless gear 37 and the cam hole 87 of the protrusion 86 of the switching rod 80.
is driven from the normal position N to the reverse position R, and as described above, the normal reproduction (recording) mode is switched to the reverse reproduction (recording) mode.

When the reverse running reaches the end of the tape, the same operation as described above is performed, and the toothless gear 37 is driven half a rotation from the reverse position to the normal position, and this rotational drive moves the switching rod 80 from the reverse position R to the normal position. Driven to IN. .

As described above, this trigger function 47 allows the lock arm section 130 to lock and unlock the partially toothed gear 37 at the normal position and reverse position, and the elastic arm section 131
Applying mechanical initial rotational force to the partially toothed gear 37 by
The return movement of the trigger lever 127 by utilizing the rotational drive of the partially toothed gear 37 and the holding in the return movement state by the holding arm portion 132 are performed by a single trigger lever 127.

In this embodiment, the trigger lever 127 and the normal/reverse switching device are used to apply the mechanical initial rotational force to the partially toothed gear 37 described above. i! 45 springs 69 are also utilized. That is, as explained in FIG. 6B, when the switching rod 80 is moved to the normal position N, the spring pressing portion 85
presses one end 69a of the spring 69, so that a force moving toward the reverse position R is applied to the switching rod 80 by the reaction force of the spring 69. Therefore, in FIG. 9A, the drive pin 89 of the partially toothed gear 37 is pressed by one side 87a of the cam hole 87 of the switching rod 80 in the direction of the arrow m' force. Therefore, when the partially toothed gear 37 is unlocked at the normal position, the initial rotational force from the switching rod 80 is applied to the partially toothed gear 37 . On the other hand, as explained in FIG. 6C, when the switching rod 80 is moved to the reverse position R, the reaction force of the spring 69 acts on the switching rod 80 in the direction of the normal position N. are doing.

Therefore, in FIG. 9D, the drive pin 89 of the partially toothed gear 37
arrow m due to the other side surface 87b of the cam hole 87 of the switching rod 80.
being pushed in the direction. Therefore, when the partially toothed gear 37 is unlocked at the reverse position, the initial rotational force from the switching rod 80 is applied to the partially toothed gear 37.

05 Next, details of the shaft-off mechanism 48 will be explained with reference to FIG. 1 and FIGS. 11A to 11D.

This shaft-off mechanism 48 is configured to perform a shaft-off operation when the magnetic tape 3 is switched from reverse running to normal running.

First, a boss portion 140 is integrally molded on the upper surface of the partially toothed gear 37, and a shaft-off shaft is provided on the circumferential surface of the boss portion 140 on the rear side in the rotational direction of the partially toothed gear 37 from the lock pawl 123 in the reverse position. A driving claw 141 is formed. The shaft off lever 1
43 is rotatably supported in the directions of the arrows and t'.

The shaft off lever 143 includes a driven pawl 144 that protrudes toward the partially toothed gear 37, and a protruding piece 94b of the lock plate 94.
A driving pawl 145 that comes into contact with the protrusion 145 and a protrusion 147 having a pin 146 at its tip are integrally molded. The shaft off lever 143 is urged to rotate in the direction of the arrow by a torsion spring 148 stretched between the chassis 6 and the bin 146.

Next, the operation of the shaft-off mechanism 48 configured as described above will be explained.

First, FIG. 11A shows a state in which the partially toothed gear 37 is in the normal position and locked as described above.

When the tape reaches the end of normal running, the partially toothed gear 37 is driven half a rotation in the direction of arrow r, and is locked in the reverse position as shown by the solid line in FIG. 11B. At this time, toothless gear 3
The driving claw 141 of No. 7 is located near the driven claw 144 of the shaft-off lever 143. During this half-rotation drive of the partially toothed gear 37, the drive pawl 141 is rotated by the shaft off lever 143.
Since it has nothing to do with this, normal driving is automatically switched to reverse driving.

Next, at the end of the tape for reverse running, gear 3 with missing teeth
7 is rotationally driven in the direction of arrow r from the reverse position,
At that moment, as shown by the dashed line, the driving claw 141 of the partially toothed gear 37 kicks the driven claw 144 of the shaft off lever 143, and the shaft off lever 143 is rotated by the torsion spring 148.
is rotated in the direction of arrow t' against the As a result, the protruding piece 94b of the lock plate 94 is pressed by the drive pawl 145 of the shaft-off lever 143, and the lock plate 94 is moved as shown by the dashed line, and the lock pawl of the playback (recording) operation lever 53 by the lock portion 94a is pressed. 53a is released.

As a result, a shaft-off operation is performed in which the reverse playback (recording) mode is automatically switched to the stop mode.

Thereafter, the partially toothed gear 37 is driven to rotate in the direction of arrow r and is locked again at the normal position.

G. Next, details of the mode switching mechanism 49 will be explained with reference to FIGS. 1 and 11A to 11D.

First, at the bottom of the chassis 6, an L-shaped mode switching lever 151 is rotatably supported in the directions of arrows U and U' by a shaft 152 provided on the chassis 6. A return spring 153 stretched between the two is biased to rotate in the direction of arrow U'. One end 151a of this mode switching lever 151 is connected to the shaft off lever 1.
43 side, and the pin 146 of the shaft off lever 143 is brought into contact with one end 151a thereof.

Therefore, rotation of the shaft off lever 143 in the direction of the arrow is restricted by the mode switching lever 151.

Note that there is a notch 154 on the other end side of the mode switching lever 151.
is formed. Further, at the bottom of the chassis 6, an operating lever 15 is provided which is substantially orthogonal to the other end of the mode switching lever 151.
6 is pivotally supported by a shaft 157 provided on the chassis 6 so as to be rotatable in the force directions of arrows V and V'. Note that a pin 158 is integrally molded on the operation lever 156, and this pin 155 is engaged with a notch 154 of the mode switching lever 151.

Next, the operation of the mode switching mechanism 49 configured as described above will be explained.

First, FIG. 11B shows a state in which the operating lever 156 is switched in the direction of arrow V, and the mode switching mechanism 49 is switched to one reciprocating mode. That is, since the pin 158 of the operating lever 156 enters the notch 154 of the mode switching lever 151, the mode switching lever 151 is rotated in the direction of arrow U' by the return spring 153. Therefore,
The pin 146 of the shaft off lever 143 is brought into contact with one end 151a of the mode switching lever 151, and the shaft off lever 143 is held in a solid line state. As a result, the shaft-off lever 143 is switched to the operating state, and as described above, the shaft-off operation is performed at the moment the partially toothed gear 37 is rotationally driven from the reverse position to the normal position.

That is, in this one reciprocating mode, the running of the magnetic tape 3 is automatically stopped after normal running and then reverse running.

Next, as shown in FIG. 11C, when the operating lever 156 is switched in the direction of arrow V', the pin 15 of the operating lever 156
8 is removed from the notch 154 of the mode switching lever 151, and the mode switching lever 151 is rotated in the direction of arrow U against the return spring 153. Then, by moving the one end 151a of the mode switching lever 151, the shaft off lever 143 is rotated in the direction of the arrow by the torsion spring 148, and the driven pawl 144 is moved to the partially toothed gear 3.
7 is removed from the rotation locus of the drive claw 141. As a result, the shaft off lever 143 is switched to the non-operating state, and even when the partially toothed gear 37 is rotationally driven from the reverse position to the normal position, the driving pawl 141 passes the driven pawl 144 without kicking it.

That is, in this continuous mode, the magnetic tape 3 is repeatedly and continuously run in normal running and reverse running.

07 Next, details of the normal/reverse switching means 50 will be explained with reference to FIG. 1 and FIG. 11A to LID diagram.

First, a switching operation lever 161 is arranged at the bottom of the chassis 6. This switching operation rod 161 is configured to be able to reciprocate in the directions of arrows W and W' by having its elongated hole 162 guided by a guide pin 163 provided on the chassis 6. The switching operation rod 161 includes an elastic arm 164 having elasticity, a pin 165, and a protrusion 166 that are integrally molded from synthetic resin. and elastic arm 164
By bringing the tip end of the switching lever 161 into elastic contact with the stepped portion 168 of the chassis 60, the switching lever 161 is moved back in the force direction of the arrow W'. Further, a changeover switch 169 made of a leaf switch is arranged near the pin 165. Further, the protrusion 166 is located at the other end 151b of the mode switching lever 151.
is in contact with.

Next, the operation of the normal/reverse switching means 50 configured as described above will be explained.

First, as shown by the dashed line in Fig. 11D, the switching operation lever 1
61 in the direction of arrow W, the changeover switch 169 is actuated by the pin 165 of the changeover operation lever 161. Then, the solenoid 138 is instantaneously energized, the trigger mechanism 47 is activated as described above, and the rotation of the partially toothed gear 37 is started.

At this time, as explained in FIG. 11C, the mode switching mechanism 4
9 is switched to continuous mode, the shutoff operation is not performed when switching from reverse to normal running, so normal running and reverse running can be selected at any time by pressing the switching operation lever 161. can be switched to However, if the mode switching mechanism 49 is switched to the one reciprocating mode as explained in FIG. 11B, the shaft-off operation is performed when switching from reverse to normal running, so the switching operation rod 161 is not activated during reverse running.
If you press , the shaft will be turned off.

However, according to this normal/reverse switching means 50, the switching operation rod 161 is pushed in the direction of the arrow W while the mode switching mechanism 49 is switched to the one-reciprocation mode, as shown by the dashed line in FIG. 11D. When the mode switching lever 1 is
51 is pressed, and the mode switching lever 151 is forcibly rotated in the direction of arrow U against the return spring 153 as shown by a dashed line. That is, the switching operation rod 161
When is pressed, the mode switching mechanism 49 is forced to switch to 11C.
The mode is switched to the continuous mode explained in the figure, and the shaft-off operation is not performed when switching from reverse to normal running, making it possible to selectively switch between normal running and reverse running at any time.

Note that the shaft off lever 143 is switched to the non-operating state by forced rotation of the mode switching lever 151 only while the switching operation rod 161 is being pressed; however, when the switching operation rod 161 is pressed, Since the partially toothed gear 37 is immediately driven to rotate, by the time the mode switching lever 151 is moved back after releasing the switching operation rod 161, the shaft-off operation has already been performed and the mode has been switched to normal driving.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, the drive rod, switching rod, etc. are not limited to the structure of the embodiment, and various structures can be applied.

In addition to the linear spring shown in the embodiment, a leaf spring or the like may also be used. Furthermore, the intermediate rotary body referred to in the present invention is not limited to gears, and idlers made of rubber or the like can also be used.

Note that the present invention is not limited to the normal/reverse switching device of an auto-reverse type small tape recorder using a compact cassette, but is applicable to the normal/reverse switching device of various types of reverse type recording and reproducing devices.

Effects of the Invention As described above, according to the present invention, even if the switching lever is moved back to the neutral position by switching to the stop mode, the switching lever does not move back to the regeneration state before the stop mode (swinging in the mode described). Since the direction can be memorized mechanically,
Next, when the mode is switched to playback (recording) mode, the vehicle automatically returns to normal running or reverse running before stopping. Therefore, even if a pause mechanism is not provided, the same function as one with a pause mechanism can be achieved, and there is no need to worry about switching back to normal or reverse mode when switching to playback (wc) mode. You can get something that is extremely convenient to use.

Moreover, according to the present invention, the above-mentioned mechanical memory function can be obtained with one substantially U-shaped spring, so the structure is extremely simple. In addition, since one substantially U-shaped spring can substantially match the spring force between the normal position and the reverse position of the switching rod, it is possible to evenly press the intermediate rotating body against the pair of reel stands. As a result, the rotation characteristics of the pair of reel stands can be made equal to each other.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to an auto-reverse compact tape recorder using a compact cassette, in which FIG. 1 is an overall plan view, FIG. 2 is an exploded perspective view of a tape running drive system, and FIG. Fig. 3 is a plan view of the same as above, Fig. 4 is a plan view of the normal and reverse switching device, Fig. 5 is an exploded perspective view of the main parts of the same, Figs. 7 is a perspective view of the head support mechanism, FIGS. 8A and 8B are plan views of the same, FIGS. 9A to 9D are plan views of the trigger mechanism, FIG. 10 is a sectional view of the same, and FIGS. 11A to 11A.
FIG. 11D is a plan view of the shaft-off mechanism, mode switching mechanism, and normal/reverse switching means. In addition, in the symbols used in the drawings, 3-・-1------Magnetic tape 7, 8-
−−−−−・・−・Reel stand 16−・−・−−−−−−
−・−・Playback (record) button 17・−・−・・−・−Stop button 30.31−・−−−−−1−−・−Reel stand gear 35
−−−−−−−−−−−−−−−・NR idle gear (intermediate rotating body) 36−−−−−−1−−−−−−Intermediate gear 37−−−−−−− --------・-・Missing tooth gear 40
・----------------NR drive gear 45・
----------------1. Normal/reverse switching device 60----------- Drive rod 66.
67--------・--Regulation section 69--------
--- Spring 69a ------One end 69b ---
・----One other end 73-----One-----Switching lever 75--
-------1-----Pressed part 76.7 Fuuuuuu...-Restricted part 80-----
All exchangeable rods 85-・----・・--・Spring pressing part 87--・-----・-----・Cam hole 89----
−−−−・・−・−・Drive pin.

Claims (1)

[Claims] It has a pressed part and a pair of regulated parts and is configured to be swingable, and by the swinging, the intermediate rotary body is selectively engaged with either one of the pair of reel stands. The vehicle has a switching lever that selectively switches the running of the vehicle between normal running and reverse running, and a pair of regulating parts that are brought into contact with the pair of regulated parts at the same time. a reciprocally movable drive rod that is moved back and forth to the forward position when switching to the playback (recording) mode; It has a substantially U-shaped spring located at the center and a spring pressing part inserted between both ends of the spring, and is reciprocated almost orthogonally to the drive rod between a normal position and a reverse position. and a switching rod, and when the driving rod is moved forward and the switching rod is moved to the normal position, the pair of regulating parts are separated from the pair of regulated parts, and the spring pressing part One end of the spring is pressed from the inside to the outside, and the other end of the spring presses the pressed part of the switching lever from one side, and the spring force at that time is used to swing the switching lever in one direction. The intermediate rotating body is configured to be crimped and engaged with one of the pair of reel stands, and when the drive rod is moved forward and the switching rod is moved to a reverse position, the pair of restriction portions are connected to the pair of restriction portions. at the same time as pressing the other end of the spring from the inside to the outside with the spring pressing part and pressing the pressed part of the switching lever from the other side with one end of the spring. The switching lever is swung in the other direction by a spring force, and the intermediate rotating body is pressed into engagement with the other of the pair of reel stands, and when the drive rod is moved back, A normal/reverse switching device for a reverse type recording/reproducing device, wherein the regulating portion is brought into contact with the pair of regulated portions at the same time, and the switching lever is held at a neutral position against the spring.