JP2598296Y2 - Tape running direction reversing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape running direction reversing device suitable for an auto-reverse tape recorder.

[0002]

2. Description of the Related Art Auto-reverse tape recorders include:
In the play mode, a tape running direction reversing device is provided to automatically start reverse running without setting the stop mode even when the running tape reaches the end. According to this, even if the reproduction of one side of the tape is completed, the reproduction of the other side is started after a while, and the recorded contents of the same tape are repeated for a long time unless the user enters the stop mode or turns off the power. It is possible to listen.

FIG. 7 shows a schematic configuration of a conventional tape running direction reversing device applied to an automatic reverse type tape recorder. In the figure, reference numeral 30 denotes a gear that rotates clockwise at all times in the play mode. Gear 3
The zero shaft 28a is attached to the chassis 10. A gear is disposed on the back side of the gear 30 via a spring (not shown), and the shaft 28a passes through the gear. In a free state, the gear is frictionally engaged with the gear 30 via a spring or the like.
, And rotates clockwise.

A gear 34 meshes with the gear (not shown), and the gear 34 is rotatable in a counterclockwise direction. On both sides of the gear 34, gear-shaped reel stands 36a, 36b driven by the gear 34 are arranged.

The gear 34 drives the right reel base 36a to rotate counterclockwise through the idler 38 in the forward play mode, and the left reel base 3 in the reverse play mode.
6b and is driven to rotate clockwise. Therefore, the gear 34 is movable between the idler 38 and the reel base 36b.

At the center of each of the reel bases 36a and 36b, reels 37a and 37b are protruded. These reels 37a and 37b rotate in the same direction with the rotation of the reel bases 36a and 36b.

In either the forward play mode or the reverse play mode, when the running tape T reaches the end, the rotation of one of the reel stands 36a and 36b stops. When this occurs, the rotation of the gear 34 stops, and the rotation of a gear (not shown) below the gear 30 that meshes with the gear 34 also stops. As described above, since the gear (not shown) is merely linked to the gear 30 by friction with the gear 30, even if the rotation of the gear stops, the gear 30 slides on the gear 30 to rotate. It is supposed to.

A direction switching slider 40 is guided by a guide member (not shown) on the chassis 10 so as to be slidable in the horizontal direction and restricted from moving in the vertical direction. The direction switching slider 40 is formed with horizontally long holes 42a and 42b along the longitudinal direction thereof, and the capstans 20a and 20b are formed with these holes 42a and 42b.
a, 42b and protrudes above the chassis 10.

The capstans 20a and 20b are interlocked with the gears described above, and are used in the play mode.
a continues to rotate counterclockwise and capstan 20b continues to rotate clockwise.

The direction switching slider 40 is connected to a switching lever (not shown). The switching lever swings around a shaft 28a of the gear 30, and the shaft 33 of the gear 34 is attached to the switching lever. ing. Therefore, when the direction switching slider 40 slides to the right, the switching lever operates to move the gear 34 to the left, whereby the reverse play mode is set when the gear 34 meshes with the reel base 36b. Conversely, direction switching slider 4
When 0 slides to the left, the switching lever operates and the gear 34 moves to the right. As a result, the gear 34 meshes with the idler 38, and the reel 36a is driven to set the forward play mode. That is, the lateral movement of the direction switching slider 40 switches which of the reels 37a and 37b is rotated, and can set the mode of the forward play or the reverse play.

One end of a reversing spring 39 is attached to the lower part of the direction switching slider 40, and the other end of the reversing spring 39 is attached to the chassis 10. When the direction switching slider 40 on the left side moves to the right to some extent, a biasing force to the right is applied to the direction switching slider 40 by the reversing spring 39. When the right direction switching slider 40 moves to the left to some extent, the reversing spring 39 applies a leftward urging force to the direction switching slider 40. Therefore, the direction switching slider 40 is stopped at that position by the reversing spring 39 at any of the left and right movement limits.

A cover plate (not shown) is superposed on the direction switching slider 40, and this cover plate is
It is fixed to 0. Shafts 46a, 4 are provided on the cover plate.
6b is protruded, and roller levers 47a and 47b are rotatably attached to the shafts 46a and 46b. Pinch rollers 48a and 48b are rotatably attached to the roller levers 47a and 47b.

The roller levers 47a, 47b are always pinch rollers 48a, 4 by a torsion spring (not shown).
8b are urged toward the corresponding capstans 20a, 20b. That is, the roller lever 47a is provided with a clockwise urging force, and the roller lever 47b is provided with a counterclockwise urging force.

The roller levers 47a and 47b are provided with projections 49a and 49b, respectively.
Pins 50a and 50b are implanted on the back side of b. Holes 52a, 52b are formed in the vicinity of the convex portions 49a, 49b of the direction switching slider 40, and the pins 50a, 50b
Reach inside the holes 52a and 52b.

The state shown in FIG.
Is the forward play mode on the left. At this time,
The pin 50b abuts the right peripheral edge of the hole 52b, so that the rotation of the roller lever 47b in the counterclockwise direction is restricted. This prevents the pinch roller 48b from approaching the capstan 20b any more. That is, the pinch roller 48b and the capstan 20
b are separated from each other so that they do not contact the tape T.

On the other hand, the roller lever 47a is free, the roller lever 47a is rotated by the above-mentioned biasing force so that the pinch roller 48a approaches the capstan 20a, and the tape T is connected to the pinch roller 48a and the capstan 20a. The reel 20a is conveyed toward the reel 37a rotating as described above.

In this state, when the direction switching slider 40 is slid rightward to set the reverse play mode, the pin 50a comes into contact with the left peripheral edge of the hole 52a, and the rotation of the roller lever 47a in the clockwise direction is performed. Be regulated. As a result, the pinch roller 48a and the capstan 20a are separated from each other so that they do not come into contact with the tape T.

On the other hand, the roller lever 47b becomes free, the roller lever 47b is rotated by the above-mentioned biasing force so that the pinch roller 48b approaches the capstan 20b, and the tape T is moved to the pinch roller 48b and the capstan 20b.
b, the reel 37b rotating as described above.
Conveyed toward.

A pin 54 projects from the chassis 10, and a swing lever 56 is attached to the pin 54 so as to be rotatable. The swing lever 56 is substantially Y-shaped,
It has a first arm 57, a second arm 58, and a third arm 59.

The first arm 57 extends toward the gear 34, and a pin 60 protrudes from the back of the tip of the first arm 57. A stop detection arm 62 having a ring-shaped base is rotatably attached to the shaft 33 of the gear 34. The stop detecting arm 62 has a groove 64 along its longitudinal direction.
The pin 60 is fitted into the groove 64, and the first arm 57 and the stop detection arm 62 are connected.

The ring-shaped base of the stop detection arm 62 is driven by the gear 34 by friction with the gear 34. That is, while the gear 34 is rotating, the stop detection arm 62 is constantly urged in the counterclockwise direction. When the stop detection arm 62 is urged in this way, the swing lever 56 is urged clockwise.

The second arm 58 extends toward the gear 30, and has a columnar cam follower 66 protruding from the back of the distal end thereof. The surface of the gear 30 is a cam. In this cam, a portion indicated by oblique lines in the drawing is convex, and other portions are concave. First, the gear 30 is formed with a circular first cam surface 68 eccentric to the gear 30.

The first cam surface 68 is connected to the shaft 28a.
An approximately crescent-shaped protruding wall 70 is formed in a direction far from the wall. The outer surface of the protruding wall 70 is parallel to the first cam surface, and a second cam surface 72 is provided on the inner side, which gradually moves away from the shaft 28a in a clockwise direction.

The cam follower 66 of the second arm 58 is gear 3
It is located in the recessed part of the cam provided at 0. As described above, when the swing lever 56 is biased clockwise, the cam follower 66 comes into contact with the first cam surface 68. When the urging force of the swing lever 56 disappears, the cam follower 66 moves from the first cam surface 68 to the second cam surface 72. When the gear 30 rotates, the first cam surface 6
In accordance with a change in the distance of the second cam surface 72 from the shaft 28a, the cam follower 66 follows, and the swing lever 56 swings.

The third arm 59 extends leftward substantially in parallel with the direction switching slider 40, and has a claw 74 formed at the tip thereof toward the direction switching slider 40. Further, a rectangular notch 76 is formed at a position facing the claw 74 of the direction switching slider 40.

A transmission lever 78 is rotatably mounted on the chassis 10.
9 is received in notch 76. The upper end of the transmission lever 78 is directed to the pawl 74, where the slope 78a,
78b is formed symmetrically.

On both sides of the notch 76, a corrugated leaf spring 80
a, 80b are formed. As shown, in the forward play mode, the transmission lever 78 is connected to the right leaf spring 80.
a, and slightly inclined counterclockwise from the upright state. On the other hand, in the reverse play mode, the transmission lever 78
Is biased by the left leaf spring 80b, and slightly tilts clockwise from the upright state.

In the play mode, the gear 30 rotates clockwise, and the reels 37a,
If any of the gears 37b is not stopped, the gear 34 rotates counterclockwise as described above. At this time,
Stop detection arm 62 biased counterclockwise by gear 34
As a result, the swing lever 56 is urged clockwise. Therefore, the cam follower 66 of the swing lever 56 abuts on the first cam surface 68 and is driven.

In the drawing, the oscillating lever 56 when the cam follower 66 is closest to the central axis 28a by the first cam surface 68 is shown by an imaginary line, and the first cam surface 68 is lowered to move the cam follower 66 to the central axis 28a. The rocking lever 56 at the farthest position from is shown by a solid line. That is, the swing lever 56 swings between the solid line and the virtual line in the figure. Stop detection arm 62
Is only driven by the gear 34 by the urging force due to friction with the gear 34, and if the swing lever 56 rotates counterclockwise as shown by the imaginary line, the stop detection arm 62 is attached as shown by the imaginary line. Rotate clockwise in opposition to the power. During this time, the pawl 74 of the third arm 59 is at a position where it does not come into contact with the transmission lever 78.

Here, the tape T ends and the reel 3
When the rotation of one of the tapes 7a and 37b on which the tape T is wound is stopped, the rotation of the gear 34 in conjunction therewith also stops. As a result, the stop detection arm 62 is released from the clockwise urging force, and the swing lever 56 also becomes free.

Accordingly, the cam follower 66 is separated from the first cam surface 68. The gear 30 has a reel base 36a, 3
Since the cam follower 66 continues to rotate irrespective of the stop of 6b, the cam follower 66 comes into contact with and follows the second cam surface 72. Because the second cam surface 72 is so close to the shaft 28a, the cam follower 66 will lift significantly more than the phantom line in the figure. As a result, the swing lever 56 rotates counterclockwise relative to the imaginary line, and the pawl 74 of the third arm 59 contacts the transmission lever 78 and pushes it.

If the reel 37a is stopped in the forward play mode as shown in the figure, the pawl 74 pushes the right inclined surface 78a, whereby the transmission lever 78 rotates counterclockwise, and the lower end 79 of the transmission lever 78 rotates. By pushing the right side of the notch 76, the direction switching slider 40 moves to the right. When the direction switching slider 40 moves to the right to some extent, the reversing spring 39 applies a biasing force to the right, and the direction switching slider 40 moves to the right limit and stops. During this time, as described above, the gear 34 separates from the idler 38 and the reel base 36b
And the pinch roller 48a engages with the capstan 20a.
, The pinch roller 48b approaches the capstan 20b, and the reverse play mode is set. Thereafter, the cam follower 66 finishes passing through the second cam surface 72.

When the gear 34 is separated from the idler 38, the gear 34 starts rotating again. Then, the cam follower 66 again comes into contact with the first cam surface 68 by the above-described biasing force, and follows the first cam surface 68. Thereafter, the cam follower 66 follows the first cam surface 72 until the reel 37b is stopped. Then, as described above, the swing lever 5
6 swings between the solid line and the virtual line shown in the figure.

When the direction switching slider 40 has moved rightward, the left leaf spring 80b urges the transmission lever 78 rightward, and the transmission lever 78 is slightly clockwise from the upright state. You will lean.

When the reel 37b stops even in the reverse play mode, the cam follower 66 comes into contact with the second cam surface 72 as described above and follows the second cam surface 72, so that the swing lever 56 is moved counterclockwise with respect to the imaginary line. Pivots, the third arm 59
Claw 74 abuts on the transmission lever 78. At this time, the nail 74
Pushes the inclined surface 78b, whereby the transmission lever 78 rotates clockwise, the lower end 79 pushes the left side surface of the notch 76, and the direction switching slider 40 moves to the left side. When the direction switching slider 40 moves to the left to some extent, the reversing spring 3
9 applies a biasing force to the left side, and the direction switching slider 40 moves to the left side limit and stops. During this time, as described above, the gear 34 separates from the reel base 36b and meshes with the idler 38, the pinch roller 48b separates from the capstan 20b, and the pinch roller 48a approaches the capstan 20a, so that the forward play mode is set. You. Thereafter, the cam follower 66 finishes passing through the second cam surface 72.

When the direction switching slider 40 has moved to the left, the right leaf spring 80a biases the transmission lever 78 to the left, and the transmission lever 78 is slightly counterclockwise from the upright state. To lean on.

[0037]

Since the above-mentioned transmission lever 78 is almost upright with respect to the direction switching slider 40, it is efficient to apply a lateral force to rotate the transmission lever 78. is there. However, the pawl 74 is moved to the transmission lever 78.
Is pressed against the center of the transmission lever 78 toward the central axis 78c of the transmission lever 78. Therefore, since a large waste of force is generated, a very large pressing force must be applied to the pawl 74.

Therefore, the conventional tape running direction reversing device has a problem that the power consumption is large. For example,
A battery is often used in a portable auto-reverse tape recorder, but the above-described problem has caused a need to frequently replace or charge the battery.

An object of the present invention is to solve the above-mentioned problem and to provide a tape running direction reversing device capable of saving power.

[0040]

In order to solve the above-mentioned problems, in the present invention, a tape end detecting means for detecting the end of the tape by stopping the rotation of the reel base and a pair of pinch rollers are selectively provided. A direction switching unit that moves in accordance with the tape running direction in order to press against the capstan and reverse the tape running direction, and a direction switching unit that transmits a detection output of the tape end detecting unit to the direction switching unit when the end of the tape comes. In the tape running direction reversing device having a transmission means, the transmission means has first and second rotation shafts, and is movably disposed between the first and second rotation shafts; Is arranged so as to be selectively rotatable about the first or second rotation axis in response to the detection output of the tape end detecting means at the time of arrival.

[0041]

As shown in FIG. 3, an operation pin 85 of a transmission lever 84 is fitted in a hole 86 of a direction switching slider 40 for switching the driving of the reels 37a and 37b and switching the operation of the pinch rollers 48a and 48b. When the tape T reaches the end,
The stop detection lever 56 rotates more than usual and pushes down the transmission lever 84.

From the forward play, the transmission lever 84 rotates counterclockwise around the fulcrum pin 92a, and the operation pin 85 moves the direction switching slider 40 to the right, thereby setting the reverse play. From the reverse play, the transmission lever 84 rotates clockwise around the fulcrum pin 92b, the operation pin 85 moves the direction switching slider 40 to the left, and forward play is set. By providing the fulcrum away from the line connecting the force point and the action point of the transmission lever 84, the force is efficiently transmitted,
It is possible to reduce power consumption.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape running direction reversing device according to the present invention will be described below in detail with reference to the drawings.
The same components as those described above are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows an auto-reverse tape recorder to which the embodiment is applied. In this auto-reverse type tape recorder, a motor 12 and a relay pulley 14 are arranged behind a substantially rectangular chassis 10 on which a cassette tape (not shown) is mounted. A motor pulley 16 is attached to a rotating shaft of the motor 12, and a belt 18 is wound between the motor pulley 16 and the relay pulley 14. The rotating shaft of the motor 12 is configured to rotate only clockwise in the drawing, and when the motor 12 is driven, the relay pulley 14 also rotates clockwise.

The chassis 10 includes a pair of capstans 2.
0a and 20b are rotatably mounted. These capstans 20a and 20b are for moving the tape T at a constant speed. In the forward play mode, a pinch roller 48a is pressed against the capstan 20a, and the tape T is sandwiched between the capstans 20a and fed. In the mode, the capstan 20b feeds the tape T between the pinch roller 48b and the pinch roller 48b.

To the capstans 20a and 20b, flywheels 22a and 22b serving as pulleys are fixed, respectively. A belt 18 is provided on the outer periphery of the relay pulley 14 described above.
And a flywheel 22a, 22b around which a belt 24 is wound. Here, when the motor 12 is driven as described above, the flywheel 22a and the capstan 20a rotate counterclockwise, and the flywheel 22b and the capstan 2
0b rotates clockwise. These continue to rotate while the motor 12 is being driven.

As shown in FIG. 2, a switching lever 28 is mounted on the rear side of the chassis 10 via a shaft 28a, and the switching lever 28 is rotatable about the shaft 28a. Also, the shaft 28a has
Two large and small gears 30 and 31 are mounted via felt pads 32.

The pad 32 has an appropriate coefficient of friction, so that the gears 30 and 31 are frictionally connected. In other words, the gear 30 can rotate even when the rotation of the gear 31 is restricted at the end of the tape or the like. When the gear 31 is free, the gear 31 rotates in the same direction as the gear 30 rotates.

The capstan 20a has a gear 26
The gear 26 is engaged with a gear 30. A shaft 33 is attached to the tip of the switching lever 28, and a gear 34 is rotatably attached to the shaft 33. The gear 34 meshes with the gear 31.

A coil spring 35 is wound around the shaft 33, and a stop detection arm 62 similar to the prior art shown in FIG.
The coil spring 35 is slightly compressed by the gear 2 and the gear 34. As a result, when the gear 34 rotates, the stop detection arm 62 is urged to rotate in the same direction by the frictional force between these members, and the stop detection arm 62 is forcibly stopped, or a small torque is applied. Thus, even if the gear 34 is rotated in the opposite direction to the gear 34, the gear 34 continues to rotate.

When the motor 12 is driven in FIG. 1, the gear 26 rotates counterclockwise integrally with the capstan 20a which rotates counterclockwise as described above, and the gear 2
The gear 30 meshed with 6 rotates clockwise. Here, in a normal case, the gear 31 rotates clockwise together with the gear 30, and the gear 34 meshing with the gear 31 rotates counterclockwise. However, as will be described later, the gear 31 is
When the gear train up to 6a is meshed, the rotation of the reel 37a is forcibly stopped due to the arrival of the end of the tape, or when the gear train from the gear 31 to the reel base 36b is meshed, the rotation of the reel 37b is similarly changed. When the tape is forcibly stopped due to the end of the tape, the gear 31,
34 stops and the gear 30 rotates against the frictional force of the pad 32 (FIG. 1). That is, the gears 26 and 31 continue to rotate as long as the motor 12 is driven.

On both sides of the gear 34, reel stands 36a, 3
6b, which is rotatably mounted on the chassis 10. The reel stands 36a and 36b are gears, and reels 37a and 37b are protruded from the centers of the gears. The reel 37a winds the tape T in the forward play mode, and the reel 37b winds the tape T in the reverse play mode. An idler 38 is rotatably attached to the chassis 10, and the idler 38 meshes with the reel base 36a.

As described above, since the switching lever 28 is rotatable around the shaft 33, the gear 34 moves on the circumference of the gear 31 by rotating the switching lever 28. The gear 34 can be engaged with the idler 38 as shown, or the gear 34 can be engaged with the reel base 36b as shown by a virtual line.

When the gear 34 is rotating in the counterclockwise direction as described above, if the gear 34 is engaged with the idler 38, the idler 38 rotates clockwise and
The reel base 36a meshing with this rotates counterclockwise,
The reel 37a also rotates in the same direction. This is the forward play mode.

Here, when the gear 34 and the idler 38 are disengaged from each other, the idler 38, the reel base 36a, the reel 37a
Rotation stops. When the gear 34 meshes with the reel base 36b, the reel base 36b rotates clockwise, and the reel 37b also rotates in the same direction. This sets the reverse play mode. Here, the gear 34 and the reel base 36b
Of the reel base 36b and the reel 37b stop rotating.

A substantially rectangular direction switching slider 40 is mounted on the front side of the chassis 10 and guided by a guide member (not shown) so as to be slidable in the horizontal direction and move in the vertical direction. Is not possible. The direction switching slider 40 has horizontally long holes 42a and 42b formed along its longitudinal direction, and the capstans 20a and 20b pass through these holes 42a and 42b and protrude above the chassis 10.

A notch 41 is formed substantially at the center of the direction switching slider 40. A pin 43 protrudes from an end of the switching lever 28 opposite to the gear 34, and the pin 43 is fitted into the notch 41. Thus, when the direction switching slider 40 slides in the horizontal direction, the switching lever 28 rotates.

Here, when the direction switching slider 40 is slid rightward, the switching lever 28 rotates counterclockwise, whereby the reverse play mode is set when the gear 34 meshes with the reel base 36b. Conversely, when the direction switching slider 40 is slid to the left, the switching lever 28 rotates clockwise. When the gear 34 meshes with the idler 38, the reel base 36a is driven and the forward play mode is set. That is, by the lateral movement of the direction switching slider 40,
By switching which of the reels 37a and 37b is rotated, a forward play or reverse play mode can be set.

A substantially rectangular cover plate 44 indicated by a two-dot chain line is superimposed on the direction switching slider 40, and the cover plate 44 is fixed to the chassis 10. Shafts 46a and 46b protrude from the cover plate 44, and roller levers 47a and 47b are mounted on the shafts 46a and 46b.
Are rotatably mounted. Roller lever 47
The pinch rollers 48a and 48b are rotatably attached to a and 47b.

The roller levers 47a and 47b are always pinch rollers 48a and 4b by a torsion spring (not shown).
8b are urged toward the corresponding capstans 20a, 20b. That is, the roller lever 47a is provided with a clockwise urging force, and the roller lever 47b is provided with a counterclockwise urging force.

The roller levers 47a and 47b are provided with protrusions 49a and 49b, respectively.
Pins 50a and 50b are implanted on the back side of b. Holes 52a and 52b are formed in the vicinity of the convex portions 49a and 49b of the direction switching slider 40, and cutouts 51a and 51b are formed in the cover plate 44.
a, 52b are exposed. And the pins 50a, 50b
Passes through the notches 51a and 51b and reaches the holes 52a and 52b.

The state shown in FIG.
Is on the left and is in forward play mode. At this time, the pin 50b comes into contact with the right peripheral edge of the hole 52b, so that the rotation of the roller lever 47b in the counterclockwise direction is restricted. This prevents the pinch roller 48b from approaching the capstan 20b any more. That is, the pinch roller 48b and the capstan 2
0b are separated from each other so that they do not contact the tape T.

On the other hand, the roller lever 47a is free, and the roller lever 47a is rotated by the urging force so that the pinch roller 48a approaches the capstan 20a. The reel 20a is conveyed toward the reel 37a rotating as described above.

In this state, when the direction switching slider 40 is slid rightward to set the reverse play mode, the pin 50a comes into contact with the left peripheral edge of the hole 52a, and the clockwise rotation of the roller lever 47a is restricted. Is done. This allows
The pinch roller 48a is separated from the capstan 20a,
Both are prevented from contacting the tape T.

On the other hand, the roller lever 47b becomes free, and the roller lever 47b is rotated by the above-mentioned biasing force so that the pinch roller 48b approaches the capstan 20b, and the tape T is moved to the pinch roller 48b and the capstan 20b.
b, the reel 37b rotating as described above.
Conveyed toward.

FIG. 3 shows the tape running direction reversing device of the embodiment. As shown in the figure, the third arm 5 of the swing lever 56
9 is not provided with a conventional claw 74 (FIG. 7), and a pin 82 is provided on the back side of the tip thereof.

A rectangular hole 86 having an appropriate length is formed in the lower left portion of the direction switching slider 40 as described later. An operation pin 85 at the lower end of a horizontally movable transmission lever 84 is inserted into the hole 86. The transmission lever 84 has a substantially rectangular base 100, and an operation pin 85 is protrudingly provided on the back side of the lower end.

The two arms 88a, 88 from both sides of the base 100
8b extends upward. Semi-circular recesses 90a, 90b are provided at the bases of these arms 88a, 88b.

The fulcrum pins 92a,
92b is protruded. The fulcrum pins 92a and 92b are
Are provided at intervals shorter than the recesses 90a and 90b,
It becomes the center of rotation of the transmission lever 84 when fitted in the recesses 90a, 90b, respectively. That is, when the fulcrum pin 92a enters the concave portion 90a according to the position of the transmission lever 84,
The fulcrum pin 92a becomes the rotation center of the transmission lever 84, and conversely, when the fulcrum pin 92b enters the recess 90b, the fulcrum pin 92b becomes the rotation center of the transmission lever 84.

A slightly protruding projection 102 is formed between these recesses 90a and 90b. And
As described later, the pin 82 of the swing lever 56 is
When the contact lever is pressed down, the transmission lever 84 rotates counterclockwise or clockwise about the fulcrum pin 92a or the fulcrum pin 92b. That is, this convex portion 1
02 is a power point for rotating the transmission lever 84.

On the back side of the convex portion 102, a pin 96 is provided to protrude. A torsion spring 95 is disposed at a position hidden by the transmission lever 84 of the chassis 10. The lower end of the torsion spring 95 is fixed to the chassis 10, and the upper end of the torsion spring 95 is in contact with a pin 96 thereon. Thus, the transmission lever 84 is always urged upward in the figure, but the upward movement is restricted by the above-mentioned fulcrum pins 92a and 92b.

The base 100 of the transmission lever 84 overlapping the direction switching slider 40 has a rectangular shape of an appropriate size for passing the capstan 20a so that the direction switching slider 40 can move left and right. An opening 94 is formed.

As shown, in the forward play mode, the direction switching slider 40 is moved to the left and urged to the left by the reversing spring 39. At this time, the fulcrum pins 92a and 92b regulate the upward movement of the transmission lever 84. The right side surface of the hole 86 of the direction switching slider 40 abuts the operation pin 85 and presses it to the left. As a result, the transmission lever 84 is pressed to the left, and the right fulcrum pin 92a is received in the recess 90a of the transmission lever 78.

When the transmission lever 84 rotates counterclockwise about the fulcrum pin 92a, the operation pin 85 pushes the right side surface of the hole 86 of the direction switching slider 40, whereby the direction switching slider 40 slides rightward. Be moved.

On the other hand, as shown in FIG. 6, in the reverse play mode, the direction switching slider 40 is moved rightward and urged rightward by the reversing spring 39.
Also at this time, the fulcrum pins 92a and 92b
Is restricted, and the left side surface of the hole 86 of the direction switching slider 40 comes into contact with the operation pin 85 and pushes it to the right, so that the transmission lever 84 also moves to the right. Pressed. Thereby, the left fulcrum pin 9
2b is received in the recess 90b of the transmission lever 78.

When the transmission lever 84 rotates clockwise about the fulcrum pin 92b, the operation pin 85 pushes the left side surface of the hole 86 of the direction switching slider 40, and the direction switching slider 40 slides to the left. You. That is, the operation pin 85 functions as an action point of the transmission lever 84.

Now, in the play mode shown in FIG.
As described above, the gear 34 rotates counterclockwise unless 0 rotates in the clockwise direction and one of the reels 37a and 37b that winds the tape T is not stopped.
At this time, the swing lever 56 is urged clockwise by the stop detection arm 62 urged counterclockwise by the gear 34. Therefore, the cam follower 66 of the swing lever 56 abuts on the first cam surface 68 and is driven.

In the figure, when the cam follower 66 is closest to the central shaft 28a by the first cam surface 68 (see FIG. 4).
Is shown by a virtual line, and the swing lever 56 when the first cam surface 68 is lowered and the cam follower 66 is farthest from the center shaft 28a is shown by a solid line. That is, the swing lever 56 swings between the solid line and the virtual line in the figure. Since the stop detection arm 62 only follows the gear 34 by the urging force due to friction with the gear 34, if the swing lever 56 rotates counterclockwise as shown by a virtual line, the stop detection arm 62 moves to the virtual line. As shown, it rotates clockwise in opposition to the biasing force. During this time, the pin 82 of the third arm 59 is at a position where it does not abut the transmission lever 84.

Here, the tape T ends and the reel 3
When the rotation of one of the tapes 7a and 37b that has wound the tape T is stopped, the rotation of the gear 34 associated therewith is also stopped. As a result, the stop detection arm 62 is released from the clockwise urging force, and the swing lever 56 becomes free.

Accordingly, the cam follower 66 is separated from the first cam surface 68. The gear 30 has a reel base 36a, 3
6b, the cam follower 66 continues to rotate regardless of the stop of the second cam surface 72, as shown in FIG.
And comes to follow it. Second cam surface 72
Is so close to the shaft 28a that the cam follower 66 will be lifted much more than the phantom line in the figure. As a result, the swing lever 56 rotates counterclockwise from the imaginary line in FIG. 3, and the pin 82 of the third arm 59 abuts on the projection 102 of the transmission lever 84 and pushes it. That is, the gears 30 and 34, the swing lever 56, the stop detection arm 62
Constitutes a tape end detecting means.

Here, if the reel 37a is stopped in the forward play mode as shown in the figure, the transmission lever 84 is rotated around the fulcrum pin 92a fitted in the recess 90a.
Rotates counterclockwise, and the operation pin 85 pushes the right side surface of the hole 86, so that the direction switching slider 40 moves rightward. When the direction switching slider 40 moves to the right to some extent, the reversing spring 39 applies a biasing force to the right, and the direction switching slider 40 moves to the right limit and stops.

During this time, as shown in FIG. 6, the gear 34 separates from the idler 38 and meshes with the reel base 36b, the pinch roller 48a separates from the capstan 20a, and the pinch roller 48b approaches the capstan 20b to The play mode is set. Thereafter, the cam follower 66 finishes passing through the second cam surface 72.

When the gear 34 is separated from the idler 38, the gear 34 starts rotating again. Then, the cam follower 66 again comes into contact with the first cam surface 68 by the above-described biasing force, and follows the first cam surface 68. Thereafter, the cam follower 66 follows the first cam surface 72 until the reel 37b is stopped. Then, as in FIG.
6 swings between the solid line and the virtual line shown in the figure.

Therefore, as shown in FIG. 6, the pin 82 of the swing lever 56 is separated from the transmission lever 84, the torsion spring 96 pushes the transmission lever 84 upward, and the position of the transmission lever 84 is regulated by the pins 92a and 92b. Become so. When the direction switching slider 40 has finished moving to the right, the left side surface of the hole 86 contacts the operating pin 85 of the transmission lever 84 and pushes it to the right. As a result, the transmission lever 84 moves to the right, and the fulcrum pin 92b on the left
0b.

Now, in the reverse play mode, the reel 37
When b stops, the cam follower 66 comes into contact with the second cam surface 72 as described above and follows the second cam surface 72 (see FIG. 5).
Therefore, the swing lever 56 largely rotates counterclockwise, and the pin 82 of the third arm 59 contacts the transmission lever 84. At this time, contrary to FIG. 5, the fulcrum pin 9 fitted in the concave portion 90b is used.
The transmission lever 84 rotates clockwise around 2b, and the operation pin 85 pushes the left side of the hole 86, so that the direction switching slider 40 moves to the left. When the direction switching slider 40 moves to the left to some extent, the reversing spring 39 applies a biasing force to the left, and the direction switching slider 40 moves to the left limit and stops.

During this time, as shown in FIG. 3, the gear 34 separates from the reel base 36b and meshes with the idler 38, the pinch roller 48b separates from the capstan 20b, and the pinch roller 48a approaches the capstan 20a to The play mode is set. Thereafter, the cam follower 66 finishes passing through the second cam surface 72.

When the gear 34 separates from the reel base 36b, the gear 34 starts to rotate again. Then, the cam follower 66 again comes into contact with the first cam surface 68 by the above-described biasing force, and follows the first cam surface 68. Thereafter, the cam follower 66 follows the first cam surface 72 until the reel 37a is stopped. Then, as shown in FIG. 3, the swing lever 56 swings again between the solid line and the virtual line shown in the figure.

Therefore, as shown in FIG. 3, the pin 82 of the swing lever 56 is separated from the transmission lever 84, the torsion spring 96 pushes the transmission lever 84 upward, and the transmission lever 84 is regulated by the pins 92a and 92b. Become like When the direction switching slider 40 has finished moving to the left, the right side surface of the hole 86 is moved to the operation pin 85 of the transmission lever 84.
And push it to the left. Thereby, the transmission lever 8
4 moves to the left, and the fulcrum pin 92b on the right
Will fit in.

As described above, in this embodiment, when the transmission lever 84 is rotated counterclockwise around the right fulcrum pin 92a, the reverse play mode is set, and the transmission lever 84 is moved to the left fulcrum. By rotating clockwise about the pin 92b, a forward play mode is set.

Each time the mode is set, the left and right recesses 90 or 90b of the transmission lever 84 are
The stroke of the direction switching slider 40 is adjusted to receive 2a or 92b. Therefore, there is no need to provide a dedicated urging means for the transmission lever 84, and the number of components does not need to be increased significantly.

Further, a conventional leaf spring 80a, shown in FIG.
Since the urging means corresponding to 80b can be omitted, it is possible to prevent the direction switching slider 40 from deteriorating with time.

[0092]

As described above, in the tape running direction reversing device according to the present invention, the transmitting means for transmitting the detection output of the tape end detecting means to the direction switching means comprises the first and second transmitting means.
The first and second rotating shafts are arranged so as to be movable between the first and second rotating shafts, and selectively at the end of the tape by the detection output of the tape end detecting means. It is arranged to be rotatable about an axis.

Therefore, according to the present invention, the rotation axis can be selected according to the running direction of the recording tape, and the direction in which the transmitting means transmits the force can be changed. It can be transmitted to the direction switching means efficiently. As a result, the power consumption can be reduced, and for example, the number of times that the battery is frequently replaced or charged can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an automatic reverse type tape recorder to which a tape running direction reversing device according to an embodiment of the present invention is applied.

FIG. 2 is a schematic development view of a driving force transmission system of the auto-reverse tape recorder.

FIG. 3 is a plan view showing a forward play mode of the embodiment.

FIG. 4 is a plan view showing rotation of the gear 30 used in the example when the play mode is stable.

FIG. 5 is a plan view showing a setting process from a forward play mode to a reverse play mode in the embodiment.

FIG. 6 is a plan view showing a reverse play mode of the embodiment.

FIG. 7 is a plan view showing an example of an automatic reverse type tape recorder to which a conventional tape running direction reversing device is applied.

[Explanation of symbols]

 T tape 20a, 20b Capstan 37a, 37b Reel 40 Direction switching slider 48a, 48b Pinch roller 56 Swing lever 62 Stop detection arm 84 Transmission lever 85 Operation pin 92a, 92b Fulcrum pin 102 Convex part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 15/02 G11B 15/44

Claims (1)

(57) [Scope of request for utility model registration] A tape end detecting means for detecting the end of the tape by stopping the rotation of the reel base; and a tape running means for selectively pressing a pair of pinch rollers against corresponding capstans to reverse the tape running direction. A tape running direction reversing device, comprising: a direction switching unit that moves in accordance with a direction; and a transmission unit that transmits a detection output of the tape end detection unit to the direction switching unit when a tape end arrives. Has a first and a second rotation axis, is movably disposed between the first and the second rotation axes, and is selectively provided by a detection output of the tape end detection means when a tape end comes. A tape running direction reversing device, wherein the tape running direction reversing device is arranged so as to be rotatable around the first or second rotation axis.