JPH0546625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auto-reverse tape recorder that allows easy manual fast-forwarding and rewinding operations.

[Prior art and problems to be solved by the invention] An auto-reverse tape recorder detects the end of a tape running in one direction, for example when the reel shaft stops rotating, and operates a tape running direction switching mechanism. The tape is configured to run in the opposite direction. The operation of the tape running direction switching mechanism by stopping the rotation of the reel shaft is, for example,
As shown in Japanese Patent No. 13349, the rotational force of the reel shaft is applied using the urging force of a rotation detecting member through a friction mechanism, and is performed when this urging force disappears.

By the way, when an auto-reverse tape recorder is provided with a fast-forward function, there is generally an operation member for fast-forwarding the tape in the right direction (usually called the forward direction) and an operation member for fast-forwarding the tape in the left direction (usually called the reverse direction). These two operating members are used to rapidly advance the tape to the right or to the left.

However, with this configuration, if you want the tape to run at high speed in the same direction (or the opposite direction) as it is currently running during playback or recording, you can change the running direction of the tape at that time. It is troublesome to have to check which operating member to operate depending on the direction of travel after checking the vehicle, and as a result, there is a problem in that erroneous operation is likely to occur.

Furthermore, if a function was provided to manually switch the tape running direction before reaching the end of the tape during playback or recording, there would be a problem in that the number of parts would increase, the configuration would become complicated, and production costs would increase.

The present invention has been made to solve these problems, and its purpose is to easily fast-forward or rewind a tape during playback or recording without having to check the tape running direction at that time. It is an object of the present invention to provide an auto-reverse type tape recorder which can run at high speed in a desired direction without fail, and which can switch the tape running direction by manual operation with a simple configuration.

[Means for solving the problem] The auto-reverse tape recorder of the present invention has the following features:
A rotation detection member that is biased to rotate in one direction by the rotational force of the reel shaft applied via a friction mechanism, and a rotation detection member that receives the biasing force of the rotation detection member to prohibit operation and stop the rotation of the reel shaft. and a tape running direction switching mechanism that operates to switch the running direction of the tape when the biasing force of the rotation detection member disappears as a result of this, and in particular, a rewinding operation member provided so as to be reciprocally movable. is provided with an engaging portion, and a restraining member that engages with the engaging portion and displaces the position when the rewinding operation member is in a forward movement intermediate position and a backward movement intermediate position,
By engaging this restraining member with the rotation detecting member at its displaced position and restraining the movement of the rotation detecting member, the same state as when the reel shaft has stopped rotating is forcibly created, thereby The present invention is characterized in that the tape running direction switching mechanism is manually operated.

Further, a temporary locking mechanism is provided to hold the restraining member at the displaced position, and the temporary locking mechanism is engaged with a part of the tape running direction switching mechanism whose position is displaced when the tape running direction switching mechanism is activated. The present invention is characterized in that the holding of the restraining member by the temporary locking mechanism is released.

[Function] According to the above-described configuration, when the rewinding operation member moves forward and backward, the restraining member that engages with the engaging portion provided on the rewinding operation member and displaces the position is moved to the displaced position. Since the rotation detecting member is engaged with the rotation detecting member and restraining the movement of the rotation detecting member, the rotation detecting member is forcibly set in the same state as when the reel shaft has stopped rotating.

As a result, the tape running direction switching mechanism operates as the biasing force of the rotation detection member disappears even though the reel shaft is rotating due to manual operation of the rewinding operation member during playback or recording. Therefore, the tape running direction is forcibly switched at this point.

In other words, since the restraint member whose position is displaced as the rewinding operation member is operated forcibly restrains the movement of the rotation detection member, the biasing force on the rotation detection member normally disappears when the reel shaft rotation stops due to the tape end. The tape running direction switching mechanism, which is activated by this, is activated by the loss of the biasing force of the rotation detection member while the reel shaft is still rotating, and the tape running direction is switched by manual operation. It will be.

[Embodiment] FIG. 1 is a plan view of a cassette tape recorder mechanism equipped with an auto-reverse function, and in the figure, reference numeral 1 indicates the main board. A tape drive mechanism including a pair of reel shafts 2a, 2b, capstan shafts 3a, 3b, and a motor 4 for rotationally driving these is mounted on the upper surface side of the main board 1.
The motor 4 simultaneously rotates both capstan shafts 3a and 3b in their respective tape feeding directions, and
The pair of reel shafts 2a and 2b are alternatively rotated in respective tape winding directions.

In addition, a head board 1a (see Fig. 6) has a magnetic head 5 for recording and playback mounted on the top surface of the main board 1.
is mounted so as to be slidable in the vertical direction in FIG. 1 (or FIG. 6). Pinch rollers 6a and 6b are mounted on the left and right sides of the magnetic head 5, respectively, corresponding to the respective capstan shafts 3a and 3b. Furthermore, a cassette holder 7 is mounted on the top surface of the main board 1.
is installed. This cassette holder 7
A rotating plate 8 that can freely rotate in the vertical direction (direction perpendicular to the plane of the paper) around the right edge in the figure, and a rotating plate 8 that can rotate in the vertical direction (direction perpendicular to the plane of the paper) about the left edge of the rotation plate 8 as an axis. It consists of a flexible cassette inserter 9. The amount of upward rotation of the rotating plate 8 is determined by a stopper 10 formed on the upper side wall of the main board 1.
Due to the presence of this stopper 10, when the rotating plate 8 and the cassette insert 9 move upward, the main board 1
is maintained in a substantially parallel state.

The cassette inserter 9 has a cassette insertion/ejection opening 11 on the left end side in FIG. 1, through which a tape cassette 12 can be inserted/removed. When the rotary plate 8 rotates downward with the tape cassette 12 inserted into the cassette inserter 9, the tape cassette 12 connects the reel shafts 2a, 2b and the capstan shaft 3.
a, 3b are loaded.

Here, the position where the rotating plate 8 rotates downward and attaches the tape cassette 12 to the reel shafts 2a, 2b and the capstan shafts 3a, 3b is referred to as the "operating position" of the cassette holder 7. The cassette holder 7 is rotated upward to a position where the tape cassette 12 can be inserted and removed from the cassette insertion/ejection opening 11.
This is referred to as "position stop".

When the cassette holder 7 moves from the "stop position" to the "operating position", the head board 1a moves to the upper playback position in FIG. When inserted, it comes into contact with the internal magnetic tape.
Also, in this way, the magnetic head 5 connects to the tape cassette 1.
2, the pinch roller on the same side as the reel shaft driven by the motor comes into pressure contact with the capstan shaft on the same side in conjunction with the movement of the head board 1a. For example, the right reel shaft 2b
is being driven, the right pinch roller 6b
comes into contact with the right capstan shaft 3b. In this way, the magnetic tape is driven rightward (or leftward), and recording/playback operations are performed.

Reference numeral 13 in FIG. 1 is a rewinding operation member;
4 is a fast forward operation member. Both operating members 1
3 and 14 are arranged above the magnetic head 5 so that they can move forward and backward in the left and right directions in the figure.
They are constantly biased toward the left in the figure by tension springs 13a and 14a, respectively.

A spring receiving member 15 is rotatably mounted on the upper surface of the rotating plate 8, with one end of the spring receiving member 15 being pivotally supported by a shaft 15a. Further, the rotating plate 8 has an eject member 1.
6 is attached to the tape cassette 12 so as to be slidable in the insertion/removal direction (horizontal direction in the figure).

The spring receiving member 15 is arranged with its rotating end facing substantially toward the ejecting member 16, and a part of the cut-and-raised piece thereof is engaged with an arcuate hole 17 installed in the rotating plate 8. The amount of rotation is regulated. Between the eject member 16 and one end of the spring receiving member 15, there is an eject spring 1 formed of a deployment spring.
8 is hanging. The ejecting member 16 has a contact portion 1 at one end (right end in the figure) that abuts the tape cassette 12 inserted into the cassette inserter 9.
9, and the other end thereof has an engaging pawl 20 that engages with one reel hub hole of the tape cassette 12 inserted into the cassette inserter 9. Also, rotating plate 8
A plate-shaped locking member 21 is rotatably mounted on the shaft 15a of the spring receiving member 15 on the lower surface side. This locking member 21 is connected to the eject member 16.
The cassette holder 7
It has a locking portion 23 that locks it in the operating position, and is constantly biased in the locking direction (clockwise in the figure) by a tension spring 24.

In the above configuration, in order to perform a playback or recording operation, the tape cassette 12 is first inserted into the cassette holder 7 in a direction extending from the cassette insertion/ejection opening 11 and substantially parallel to the main board 1. Then, the tip of the tape cassette 12 comes to push the abutting portion 19 of the eject member 16, and as a result, the eject member 16 moves forward against the eject spring 18. At this time, the tape cassette 12 is
The engaging pawl 20 is engaged with the reel hub hole and moved forward together with the eject member 16. As the eject member 16 moves forward, the eject spring 18
The amount of elastic deformation gradually increases, and when the amount of elastic deformation exceeds the maximum position, the elastic force of the eject spring 18 acts to move the eject member 16 in the forward direction. Therefore, tape cassette 1
2 is no longer required, and the eject spring 18
The tape cassette 12 is drawn into the cassette holder 7 by the elastic force. and tape cassette 1
2 is pulled deep into the cassette holder 7, the eject member 16 engages the abutting piece 22 of the locking member 21.
Press. Then, the locking member 21 engages the tension spring 2
4 in the counterclockwise direction in the figure, and the locking portion 23
is removed from the upper edge of the side plate of the main board 1, the cassette holder 7 is lowered to the operating position by the force of a spring (not shown), and the tape cassette 12 in the cassette inserter 9 is moved to the reel shafts 2a, 2b and capstan shafts 3a, 3.
b is loaded. Then, the cassette holder 7
The head board 1a moves forward in conjunction with the lowering of the head, and the magnetic head 5 comes into contact with the magnetic tape, and one pinch roller (for example, 6a) presses against the corresponding capstan shaft (for example, 3a) to record or play back. It becomes operational.

Next, the tape rewinding operation will be explained. The drawings from FIG. 2 and FIG. 7 onwards show the configuration of the tape running direction switching mechanism and its peripheral parts.
Reference numeral 31 is a switching plate. This switching plate 31 is arranged on the upper surface side of the main board 1, and includes a guide hole 32 and a guide pin 33 provided upright on the main board.
It is possible to slide in the left and right directions in the figure by fitting with. A plate-shaped restraining member 34 is disposed on the lower surface side of the switching plate 31, and this restraining member 34 is moved vertically in the figure by fitting the elongated guide hole 35 and the guide pin 36 provided upright on the main board 1. It can be slid. A triangular chevron-shaped convex portion 34a is protruded from the lower end of the restraining member 34, and when the rewinding operation member 13 is pushed in, the member 13
A bent piece 13b formed in a part of (see Fig. 5)
comes into sliding contact with the inclined surface of the convex portion 34a, and moves the restraining member 34 upward in the figure.

Rotating arms 37a and 37b are connected to the left and right sides of the switching plate 31 by fitting an elongated hole 39 and a pin 40. Each rotating arm 37a,
37b is rotatable around capstan shafts 3a, 3b, and gears 41a, 41b are rotatably mounted on each arm 37a, 37b via shafts 42a, 42b. In the drawings from FIG. 2 and FIG. 7 onward, gears are shown as mere circles corresponding to pitch circles for the sake of simplicity, and the meshing locations of the gears are shown with black circles.

Each gear 41a, 41b has an eccentric cam 43a, 4
3b and press pins 43aa and 43bb are integrally provided. Each of the gears 41a and 41b meshes with gears 44a and 44b that rotate integrally with the capstan shafts 3a and 3b, respectively.
The rotational force from the motor 4 is transmitted via 4a and 44b.

Symbols 45a and 45b are left and right cam followers,
These are rotatably adhered to the main board 1, and extension pieces 46a, 46b provided at one end are in contact with the circumferential surfaces of the eccentric cams 43a, 43b. Also,
A contact piece 46a, 47b is provided at one end of each cam follower 45a, 45b adjacent to each extension piece 46a, 46b. Furthermore, each cam lever 45
A pressure receiving piece 48a, near the center of rotation of a, 45b.
48b is provided protrudingly.

The above switching plate 31, the left and right rotating arms 37a, 37b connected to the switching plate 31, the eccentric cams 43a, 43b, and the pressing pins 43aa, 43
A tape running direction switching mechanism is constituted by gears 41a, 41b provided with bb, eccentric cams 43a, 43b, and cam followers 45a, 45b that engage with pressing pins 43aa, 43bb.

On the other hand, each reel shaft 3a, 3 is provided on the upper surface of the main board 1.
Rotation detection plates 49a and 49b are arranged coaxially with b. On the outer periphery of each detection plate 49a, 49b are press pieces 50a, 50b and stopper pieces 51a, 51b.
are protrudingly provided adjacent to each other, and each pressing piece 50a,
50b is adapted to abut against the pressure receiving pieces 48a, 48b from the rotation direction side. Note that the amount of counterclockwise rotation of the left rotation detection plate 49a is limited by the stopper piece 50a coming into contact with the stopper 51aa, and the amount of clockwise rotation of the right rotation detection plate 49b is limited by the stopper piece 51b. is restricted by contacting the stopper 51bb.

The reel shafts 2a, 2b are attached to the main board 1 as shown in FIG. 3 (However, since the mounting structure of the left and right reel shafts 2a, 2b is the same, (Only the reel shaft 2b is shown.)

As shown in FIG. 3, a fixed shaft 52 is provided upright on the main board 1, and a cylindrical body 53 is rotatably fitted onto the fixed shaft 52. A flange 54 is formed at the lower end of the cylindrical body 53.
On the top side, there is a reel gear 55b (the reel gear 55a is on the left reel shaft 2a side in the figure).
A pressure receiving plate 56 is rotatably fitted loosely around the outer periphery of the cylindrical body 53, and the rotation detecting plate 49b is rotatably disposed on the upper surface side of the pressure receiving plate 56.
A portion of the pressure receiving plate 56 is engaged with the lower end of the reel shaft 2b in the rotational direction, so that the pressure receiving plate 56 and the reel shaft 2b are rotated together.
Moreover, between the flange 54 and the reel gear 55b,
Friction plates 57a, 57b, 5 made of felt or the like are provided between the reel gear 55b and the pressure receiving plate 56, and between the pressure receiving plate 56 and the rotation detection plate 49b, respectively.
7c is inserted. Coil springs 59 and 6 are installed between the reel engagement plate 58 and the rotation detection plate 49b, which are mounted on the outer periphery of the reel shaft 2b so as to be vertically movable, and between the pressure receiving plate 56 and the reel shaft 2b.
A friction mechanism is constituted by these springs 59, 60 and the friction plates 57a, 57b, 57c.

Therefore, the rotational force of the motor 4 is transferred to the reel gear 5.
b, the rotational force is transferred to the reel shaft 2 via the rotation transmission friction mechanism (friction plate 57a).
transmitted to b. While the reel shaft 2b is rotating, the rotational force is transmitted to the rotation detection plate 49b via the rotation detection friction mechanism (friction plate 57c).
The pressure piece 50b provided on the rotation detection plate 49b continues to press the pressure receiving piece 48b of the cam follower 45b. In addition, when the tape end is reached, the reel shaft 2b is rotated while the motor 4 is rotating.
When the friction plates 57a and 57b receive an excessive load,
A slip occurs on the upper and lower surfaces of the reel shaft 2b, and the reel shaft 2b is forcibly stopped. As a result, the pressing force of the pressing piece 50b against the pressure receiving plate 48b disappears.

As shown in FIG. 2, a temporary locking plate 61 is installed on the lower surface side of the restraining member 34 so as to be rotatable about a shaft 62 on the main board 1. This temporary locking plate 61 is provided with a locking portion 61a, and when the restraining member 34 is slid upward in the figure, the seventh
As shown in the figure, a protrusion 63 protruding from the lower surface of the restraint member 34 is engaged with the locking portion 61a, thereby inhibiting the restraint member 34 from moving downward. Also,
The temporary locking plate 61 is provided with a bent portion 61b, and the switching plate 31 is formed with a triangular chevron-shaped convex portion 31a. When the switching plate 31 slides in the left-right direction in the drawing, the inclined surface of the triangular convex portion 31a slides on the bent portion 61b, thereby rotating the temporary locking plate 61 counterclockwise in the drawing. It's becoming like that.

Next, the head board 1a with the magnetic head 5 attached
, a rewind operation member 13 , and a fast forward operation member 14
The relationship will be explained based on FIGS. 4 to 6.

When the tape cassette is loaded, the head board 1a is in the upwardly advanced position in FIG. 4, that is, in the playback or recording operation position.

On the other hand, on each side edge of the rewind operation member 13 and the fast forward operation member 14, there are protrusions 71 of the same shape,
91 are provided at positions overlapping each other.

Further, a part of a locking member 72 (see FIG. 5) is located in the movement path of the protrusions 71, 91, and the rewinding operation member 13 is located in the playback or recording operation state.
Or when the fast forward operation member 14 is pushed in,
This locking member 72 engages with the protrusion 71 or 91 to prevent the operating member 13 or 14 from returning.

Further, when pushing the rewind operating member 13 or the fast forward operating member 14, a part of the operating member comes into contact with the bent piece 75a of the rotating member 75 (see FIG. 4) that is pivotally supported on the main board 1. This rotating member 7
5 in the clockwise direction in the figure. As a result, the rotating member 75 is rotated from the pin 7 erected on the head board 1a.
6 in the downward direction in the figure, the head board 1a is moved downward in the figure.

As shown in FIG. 5, an auxiliary member 73 is pivotally supported on the lock member 72 via a pin 74.
This auxiliary member 73 is secured to the locking member 7 by a spring 77.
2 is biased in the direction of pulling it back.

Also, when the rewinding operation member 13 is pushed in, the rewinding operation member (see FIGS. 5 and 2) 1
The third bent piece 13b slides on the inclined surface of the triangular convex portion 34a to move the restraint member 34 forward. This allows the motor 4 to move the reel shaft 2a or 2b.
A rotation transmission mechanism that selectively transmits rotational force to the recording medium is operated to shift from a reproducing operation to a rewinding operation, as will be described later. In addition, the reference numeral 8 in Figure 2
Reference numerals 2b and 82a are bar springs attached to the switching plate 31, and reference numerals 83 and 84 are pressing pieces formed at the lower ends of the locking member 72 and the auxiliary member 73, respectively.

FIG. 2 shows a state in which the magnetic tape is running rightward to perform a reproducing operation. At this time, the switching plate 31 is moving to the right in the figure.
Right gears 44b, 41b and reel gear 55b
are sequentially engaged, the rotational force of the motor 4 is transmitted to the reel gear 55b, and the right pinch roller 6b
is in pressure contact with the capstan shaft 3b. Further, since the switching plate 31 is moving rightward, the left rotating arm 37a is in a position rotated counterclockwise in the figure about the capstan shaft 3a. As a result, the gear 41a is separated from the reel gear 55a, and the pinch roller 6a is also pushed back by the rotating arm 37a to a position separated from the capstan shaft 3a.

Therefore, the right cam follower 45b receives the pressing force from the pressing piece 50b of the rotation detecting plate 49b through the pressure receiving piece 45b.
8b and presses the extension piece 46b against the outer periphery of the eccentric cam 43b, the cam follower 45b repeats reciprocating motion every time the gear 41b rotates once. At this time, when the longest radius part of the eccentric cam 43b comes into contact with the extension piece 46b, the contact part 47b is pressed against the pressing pin 43bb.
However, before the pressing pin 43bb reaches the contact position with the contact portion 47b, the cam follower 45b rotates clockwise in the figure as the eccentric cam 43b rotates. , as long as the cam follower 45b is receiving the pressing force from the rotation detection plate 49b, the pressing pin 43bb is pressed against the contact piece 47b.
It never comes into contact with.

In addition, the left cam follower 45a does not receive the pressing force from the pressing piece 50a of the rotation detection plate 49a, but instead receives a bar spring 8 attached to the switching plate 31.
2a is always biased to rotate counterclockwise.
Therefore, the cam follower 45a has an extension piece 46a thereof.
is pressed against the outer periphery of the eccentric cam 43a,
The reciprocating operation is repeated every time the gear 41a rotates once.

When the high-speed rewind operation member 13 is pushed in in the state shown in FIG. 2, the same operation member 13
The bent piece 13b presses the convex portion 34a of the restraint member 34, causing the restraint member 34 to reciprocate upward in the figure.
As a result, among the engaging arm parts 85b and 85a protruding from both sides of the upper end of the restraining member 34, the right engaging arm part 85b is connected to the stopper piece 51b of the detection plate 49b.
is pushed back to separate the pressing piece 50b from the pressure receiving piece 48b, thereby prohibiting the counterclockwise rotation of the detection plate 49b. Then, the cam follower 45b moves to the eccentric cam 43.
The extension piece 46b is pushed by the longest radius part of b, rotates counterclockwise, and remains in that position. When the gear 41b further rotates in this state, the pressing pin 43bb comes into contact with the tip of the abutment piece 47b, so the rotating arm 37b rotates clockwise as shown in FIG.

On the other hand, when the restraining member 34 moves forward, the projection 6
3 engages with the locking portion 61a of the temporary locking plate 61, so even after the bent piece 13b of the rewind operation member 13 passes through the convex portion 34a of the restraint member 34 and moves forward, the restraint member 34 is immediately There will be no return. after that,
When the switching plate 31 slides to the left in the figure as shown in FIG.
engages with the bent portion 61b of the temporary locking plate 61 and rotates the temporary locking plate 61 in the counterclockwise direction. It is untied and returns to its original position as shown in Figure 8.

Note that when the restraint member 34 moves forward, the protrusion 34b provided at the rear end of the restraint member 34 presses against the pressing piece 84 of the auxiliary member 73 (see FIG. 5) as shown in FIG.
Push back to the left in the figure. Therefore, the temporary locking plate 61
Even if the temporary locking member 61 rotates counterclockwise as shown in FIG.
The pressure is not transmitted to the pressing piece 83 of the locking member 72 via. Therefore, a malfunction such as when the holding of the rewinding operation member 13 is released due to the rotation of the temporary locking plate 61 in conjunction with the operation of the switching plate 31 does not occur. Further, due to the clockwise rotation of the rotation arm 37b, the gear 41b is shifted to the reel gear 8.
1b, and the accompanying movement of the switching plate 31 to the left causes the left rotation arm 37a to rotate clockwise in the figure, and the gear 41 as shown in FIG.
a into mesh with the reel gear 81a. Thereby, the rotational force of the motor 4 is transmitted to the reel gear 81a via the gears 44a, 41a. At this time, the pinch roller 6a is separated from the capstan shaft 3a due to the retreat of the head board 1a as the rewinding operation member 13 moves to the right, so that the tape is rewound to the left. In addition, at this time, the temporary locking plate 61 moves the switching plate 31 to the left,
Since the bent portion 61a has come off the triangular convex portion 31, it has returned to its original position.

Next, when the tape is rewound to a desired position and it is desired to return to the original playback operation, the fast forward operation member 41 may be pushed in by a predetermined amount. That is, during the rewind operation, the rewind operation member 13 is held in the pressed position by the lock member 72 as shown in FIG. Since the tip inclined portion pushes the locking member 72 downward in FIG. 6, the member 14 is pushed to the position where the locking member 72 is pushed away. As a result, the holding of the rewind operation member 13 by the lock member 72 is released, so that the fast forward operation member 14 is no longer pushed in, and the same member 14 is returned to its original position by the spring 14a.
Then, the rewinding operation member 13 is returned by the spring 13a, but in the middle of this, the bent piece 13b comes into contact with the convex part 34a of the restraint member 34, and this restraint member 34
is moved back and forth as shown in Figure 10. As a result, the left engagement arm 85a of the restraint member 34 pushes back the stopper piece 51a of the left detection plate 49a counterclockwise. As a result, the cam follower 45a is pushed by the longest radius of the eccentric cam 43a and remains in the clockwise rotated position, so the pressing pin 43aa comes into contact with the tip of the abutment piece 47a, and is rotated by the rotational force of the gear 41a. Rotating arm 37a rotates counterclockwise. As a result, the gear 41a separates from the reel gear 55a, and the switching plate 31 moves to the right. Therefore, the right rotating arm 37b rotates counterclockwise, and the right gear 4 is rotated as shown in FIG.
1b is brought into mesh with the reel gear 55b. Then, when the rewinding operation member 13 returns to its original non-operating position, the pushing back by the rotating member 75 is released, the head board 1a moves forward, and the magnetic head 5 and pinch roller 6b return to their operating positions. do,
The original playback operation status is restored.

Further, when the tape is rewound to the end in the rewinding state shown in FIG. 9, the rotation of the reel shaft 2a and the detection plate 49a is stopped. Therefore, since the biasing force against the cam follower 45a disappears, the gear 41
As the eccentric cam 43a rotates, the longest radius part of the eccentric cam 43a comes into contact with the extension piece 46a of the cam follower 45a, and then the pressing pin 43aa comes into contact with the tip of the contact piece 47a, and the rotating arm 37a is rotated by the rotational force of the gear 41a.
rotates counterclockwise. Then switching plate 3
1 moves to the right in the figure, and the right rotating arm 37
b is rotated counterclockwise to mesh the gear 41b with the reel gear 55b. Further, as the switching plate 31 moves, the triangular convex portion 31a and the bent portion 61b slide together, causing the temporary locking plate 61 to rotate counterclockwise, and the end portion 61c of the temporary locking plate 61 rotates toward the auxiliary member 73.
Since the pressing piece 84 presses, the pressing piece 83 of the locking member 72 is pressed outward via this pressing piece 84. This causes the lock member 72 to rotate,
Since the holding of the rewind operating member 13 is released, the operating member 13 is returned to its original position by the spring 13a. As the rewind operation member 13 returns, the head board 1a returns forward in the same way as in the case described above, returning to the original reproducing operation state.

Next, after fast-forwarding the tape to a desired position during playback, if you want to return to the original playback state again, first push in the fast-forward operation member 14 and turn the rotating member 75 clockwise. , head board 1a
the magnetic head 5 and the pinch roller 6b.
to retreat. This results in a fast forward operation state. When the tape has been wound to a desired position, the rewinding operation member 13 is pushed to a position where the locking member 72 is pushed outward, and the engagement of the fast forwarding operation member 14 with the locking member 72 is released.

Incidentally, in order to switch the tape running direction during the playback operation, the rewind operation member 13 is moved to the restraining member 34.
When the tape running direction switching mechanism is activated, the rewinding operation member 13 may be returned to its original position.

In the above, we have explained the case where rewinding and fast forwarding operations are performed while the tape is running to the right and a playback operation is being performed. The return operating member 13 may be pushed in, and when performing a fast forward operation, the fast forward operating member 14 may be pushed in. Further, rewinding and fast forwarding operations during recording operation are the same as operations during playback operation.

[Effects of the Invention] As detailed above, according to the auto-reverse tape recorder of the present invention, when the rewinding operation member moves forward and backward, the rewinding operation member engages with the engaging portion provided on the rewinding operation member. The restraining member whose position is displaced engages with the rotation detecting member at the displaced position and restrains its movement, so as the biasing force of the rotation detecting member is forcibly dissipated, the tape running direction switching mechanism will be activated. As a result, it is possible to manually switch the tape running direction by effectively utilizing the tape running direction switching mechanism, which is originally activated by detecting the end of the tape, and the configuration for this purpose is very simple.

In other words, by providing a simple structure in which a restraining member is provided that restrains the movement of the rotation detection member in conjunction with the rewinding operation member, the running direction of the tape can be easily and reliably adjusted by manual operation regardless of the running direction of the tape. The fact that it can be reversed has a great practical effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a cassette tape recorder, FIG.
Figures 7 to 11 are plan views showing the tape running direction switching mechanism and its surroundings, Figure 3 is a vertical sectional view showing the reel shaft and its surroundings, and Figures 4 and 6 are rewinding and fast forwarding. A plan view showing the relationship between the operating member and the head board, FIG. 5 is a view taken along the - arrow in FIG. 4. 2a, 2b...Reel shaft, 4...Motor, 5...
...Magnetic head, 13... Rewinding operation member, 14...
...Fast forward operation member, 31...Switching plate, 34
...Restriction member, 49a, 49b... Rotation detection plate.

Claims (1)

[Scope of Claims] 1. The rotational force of the motor 4 is selectively transmitted to the pair of reel shafts 2a and 2b via the rotation transmission friction mechanism 57a to run the tape unilaterally and to rotate the reel shafts. The force is transmitted to the rotation detection member 49a through the rotation detection friction mechanism 57c.
49b to bias the rotation detecting member in one direction, the operation is prohibited by receiving the biasing force of the rotation detecting member, and the biasing force of the rotation detecting member due to the rotation of the reel shaft is stopped. Tape running direction switching mechanism 31, 37a, 37b, 41 that operates when the tape disappears
In an auto-reverse type tape recorder in which the running direction of the tape is switched by a, 41b, 43a, 43b, 45a, and 45b, the magnetic head and pinch roller, which are provided so as to be able to reciprocate and are in an operating position during forward movement, are A rewinding member 13 that is retracted toward the stop position and returned to the operating position during backward movement, and an engaging portion 13b provided on this rewinding operation member.
and when the rewinding operation member is in a forward movement midway position and a backward movement midway position, it engages with the engaging portion and is displaced, and at the displaced position, engages with the rotation detection member to prevent the rotation. An auto-reverse type tape recorder comprising a restraining member 34 that restrains the movement of the detection member and forcibly eliminates the biasing force applied to the tape running direction switching mechanism. 2. The restraining member is held in a state where it engages with the temporary locking member 61 and restrains the movement of the rotation detection member at the displaced position where it is moved by engaging with the engaging portion of the rewinding operation member. The temporary locking member engages with a portion 31a of the tape running direction switching mechanism that is displaced by the operation of the tape running direction switching mechanism, and moves to a position where the holding of the restraining member is released. An auto-reverse tape recorder according to claim 1.