JPH0210553A - Tape recorder - Google Patents

Abstract

PURPOSE:To facilitate miniaturization of the tape recorder in abandonment of individual energizing means corresponding to an intermediate gear supporting lever, etc., by energizing a change lever with a limit spring via a recording and reproducing head moving lever and a pinch roller moving lever in the direction of their middle position. CONSTITUTION:A recording and/or reproducing head is advanced or retreated by the recording and/or reproducing head moving lever which is reciprocated by a recording and/or reproducing lever 24 via the limiter spring 38. In this case, the supporting lever for the intermediate gear 31 for driving selectively a reel base 6 or 7 and the change lever 46 for advancing selectively a pinch roller 10 or 11 are energized in a prescribed direction by the limiter spring 38. Consequently, by abandonment of each energizing means to be provided individually to each individual lever, the tape recorder with simple constitution can be obtained.

Description

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

A. Industrial field of application B9 Overview of the invention C9 Prior art D0 Problems to be solved by the invention 88 Means for solving the problems F0 Effect G. Example G-1 Overview of configuration of tape recorder and tape running drive Explanation of the system (Figures 1 and 2) Explanation of the G-2 normal-reverse switching device (Figures 1 and 3 and 4) Explanation of the G-3 trigger mechanism (Figures 1 and 5) - Fig. 8) Explanation of the G-4 tape end detection mechanism (Fig. 1, Fig. 9) Explanation of the G-5 shaft-off mechanism (Fig. 1, Fig. 1θ) Explanation of the G-6 mode switching mechanism (Fig. 1, Fig. 9) 1, 10) Explanation of the G-7 magnetic head and pinch roller support mechanism (
(Figures 1 and 11) H6 Effects of the Invention A, Field of Industrial Application The present invention relates to a tape recorder that records and/or reproduces predetermined information signals on a recording tape such as a magnetic tape.

B1 Summary of the Invention The present invention provides a tape recorder in which a recording and/or reproducing head is moved forward and backward by a recording and/or reproducing head moving lever that is reciprocated by a recording and/or reproducing lever via a limiter spring. , a lever that supports an intermediate gear that selectively drives one of the reel stands, and a switching lever that selectively advances one of the pinch rollers are biased in a predetermined direction. The purpose of the present invention is to provide a tape recorder having a simple configuration by eliminating the biasing means separately provided in the tape recorder.

BACKGROUND OF THE INVENTION Conventionally, so-called reverse tape recorders have been proposed which are capable of recording and/or reproducing a magnetic tape serving as a recording tape in either one direction or the other direction.

In this tape recorder, one of the pair of reel stands on which the pair of tape reels wound with the magnetic tape is selectively driven to rotate as the pick-up reel side, and also rotate in opposite directions. By selectively pressing one of the pair of driven pinch rollers against the magnetic tape, the feeding direction of the magnetic tape is switched between a normal direction and a reverse direction.

In order to selectively drive one of the pair of reel stands, the intermediate gear attached to the intermediate gear support lever is controlled to swing freely. He is trying to selectively mesh with the reel stand gears provided on each reel stand. The intermediate gear support lever swings, for example, in conjunction with the movement of a switching lever that is supported in a reciprocating manner. Further, in order to selectively press and bias one of the pair of pinch rollers toward the magnetic tape side, the pinch roller has one end and the other end facing the one and the other pinch rollers, respectively. The moving lever is swung in conjunction with the switching lever.

The switching lever is moved, for example, by rotation of a partially toothed gear having a cam portion that engages with the switching lever. This toothless gear is a gear having a pair of toothless parts, and in a state where one or the other toothless part is opposed to a drive gear rotationally driven by a motor etc., the above-mentioned cam part Position the switching lever to one side or the other. The partially toothed gear is locked by a predetermined locking means at a position where the partially toothed portion faces the drive gear, and is urged to rotate in a predetermined direction either directly or via the switching lever.

To switch the feeding direction of the magnetic tape, the partially toothed gear is unlocked by the locking means.

Then, since the toothless gear is rotationally biased, one (or the other) toothless part moves from the position where it intersects with the drive gear, and the gear part of this toothless gear meshes with the drive gear. do. The partially toothed gear meshed with the drive gear is rotationally driven by the drive gear to a position where the other (or one) partially toothed portion faces the drive gear. By such rotation of the partially toothed gear, the switching lever is moved from the one side (or the other side) to the other side (or the negative side), and the feeding direction of the magnetic tape is switched.

D1 Problem to be Solved by the Invention By the way, in the so-called reverse type tape recorder as described above, the intermediate gear supporting lever is swing-controlled, and the intermediate gear is rotatably driven by the reel base gear. It is necessary to make sure that it is pressed and biased. If the intermediate gear is not pressed against the reel base gear, the intermediate gear will separate from the reel base gear as the intermediate gear rotates, and the reel base cannot be rotated properly. It is necessary to provide the intermediate gear support lever with an urging means for further urging the intermediate gear support lever to swing in the direction in which it is swung by the switching lever.

Further, in the above-described tape recorder, in order to ensure that the feeding direction of the magnetic tape is switched smoothly, it is necessary to provide a biasing means for biasing the partially toothed gear to rotate in a predetermined direction.

Providing biasing means for the intermediate gear support lever, the toothless gear, etc. in this manner complicates the configuration of the tape recorder, making it difficult to downsize it and make it difficult to manufacture it easily. ing.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, has a simple structure that eliminates biasing means individually provided corresponding to intermediate gear support levers, switching levers, etc., and has a small size. It is an object of the present invention to provide a tape recorder that can be easily manufactured.

80 Means for Solving the Problems In order to solve the above-mentioned problems and achieve the above objects, a tape recorder according to the present invention is supported so as to be reciprocally movable, is biased in the backward movement direction, and is not engaged in the forward movement position. a recording and/or reproducing lever that is stopped; a recording and/or reproducing head moving lever that is supported in a reciprocating manner and that is reciprocated via a limiter spring due to the reciprocating movement of the recording and/or reproducing lever; A switching lever is freely supported, and the recording and/or reproducing head moving lever is swingably attached to the recording and/or reproducing head moving lever, and when the recording and/or reproducing head moving lever moves forward, the switching lever is brought into contact with the switching lever. A pinch roller moving lever that swings in either direction depending on the position of the lever; an intermediate gear support lever for selectively engaging the intermediate gear with either one of the reel stands, and in a state where the recording and/or reproducing lever is locked at the forward movement position,
The limiter spring biases the intermediate gear in the direction of the selected reel stand via the recording and/or reproducing head moving lever, the pinch roller moving lever, and the intermediate gear support lever, and also biases the intermediate gear toward the selected reel stand. Alternatively, the switching lever may be biased toward its center position via the reproducing head moving lever and the pinch roller moving lever.

F6 action In the tape recorder according to the present invention, the intermediate gear is
A limiter spring interposed between the recording and/or reproducing lever and the recording and/or reproducing head moving lever allows the selection to be performed via the recording and/or reproducing head moving lever, the pinch roller moving lever, and the intermediate gear support lever. At the same time, the switching lever is urged toward its center position by the limiter spring via the recording and/or reproducing head moving lever and the pinch roller moving lever. Therefore, it is possible to eliminate biasing means provided individually for the intermediate gear and the switching lever.

G. Examples Specific examples of the present invention will be described below with reference to the drawings. This example is an example in which the present invention is applied to a so-called auto-reverse type compact tape recorder using a compact cassette.

First, the outline of the configuration of the tape recorder and the tape running drive system will be explained with reference to FIGS. 1 and 2.

In this tape recorder, as shown in Figure 2,
Magnetic tape 3 wound around a pair of left and right reel hubs 1.2
A tape cassette 4 containing the tape cassette 4 is mounted horizontally on the upper part of the chassis 5. A pair of left and right reel stands 6°7, capstans 8 and 9, a pinch roller 1O511, a magnetic head 12 serving as a recording and/or reproducing head, etc. are provided on the upper part of the chassis 5, and these are mounted on the chassis 5. The reel hub 1.2 of the tape cassette 4 is engaged with the reel stand 6.7, and the magnetic tape 3
is in sliding contact with the capstan 8.9 and the magnetic head 12, and the hook is passed. On the front side of the chassis 5, there is a playback (recording/playback) button 13, a stop button 14, a fast forward button 15, and a rewind! A mode switching button such as []16 is attached.

As shown in FIG. 1, the lower part of the chassis 5 includes a flat and thin motor 17, a capstan pulley 18.19 which also serves as a capstan flywheel and which is fixed to the lower end of the capstan 8.9. A pair of reel stands6.
An intermediate pulley 20 is installed at a substantially intermediate position of the cap stan boo 719, and a reversing boo 1J21 is disposed on one side of the cap stan boo 719. And each of these pulleys 1
819.20.21 and the drive pulley 22 of the motor 17
A belt 23 made of an elastic material is wound between the drive pulleys 22 and 17, and as the drive pulley 22 rotates in a predetermined direction indicated by an arrow in FIG.
18, 19, 20, and 21 are each rotated in a predetermined direction.

The playback button 13, stop button 14, fast-forward button 15, and rewind button 16 are the ends of the playback lever 24, stop lever 25, fast-forward lever 26, and rewind lever 27, which are the corresponding recording and/or playback levers, respectively. installed on. Each lever 24, 25, 26, 27 is connected to the chassis 5.
It is mounted so as to be able to reciprocate along the lower surface of the chassis 5, and is biased from the side edges of the chassis 5 in a direction to cause the phases 13, 14, 15.degree. 16 to protrude outward.

Claw portions 24a, 25a, 25a, 27a provided on each of these levers 24, 25, 26.27, respectively.
A lock plate 28 is provided, which has a hole corresponding to the lock plate 28, is attached to the chassis 5 so as to be reciprocally movable, and is biased toward one side. At the inner edge of the hole, the corresponding claw portions 24 a, 25 a,
26 a, 27 a are provided with inclined surfaces that come into contact with each other, and when the respective levers 24, 25, 26, and 27 move forward,
The lock Fi2B is moved to the other side against the force. Also, the claw portions 24a and 26 of the playback lever 24, fast forward lever 26, and rewind lever 27 are
The inner edges of the holes corresponding to the holes 24a, 26a, and 27a are provided with locking claws that engage with the respective claws 24a, 26a, and 27a.
6. The rewind lever 27 is adapted to be latched at the position moved inward of the chassis 5. This locking is released by moving the lock plate 28 toward the other side due to the forward movement of the stop lever 25.

Also, like the lock plate 28, it has holes corresponding to the claws 24a, 25a, 26a, and 27a of each of the levers, and is attached to the chassis 5 so as to be able to reciprocate along the same side. switch plate 2 which is energized by
9 is provided.

Among the holes of this switch plate 29, the regeneration lever 24
, each claw part 24a of the fast forward lever 26 and the rewind lever 27.
, 26a, 27a are provided with sloped portions that come into contact with the respective claws, and the respective levers 24,
26 and 27, this switch plate 29 is moved to the other side against the force.

When a switch (not shown) is operated by moving the switch plate 29, the motor 17 is rotated, and
A reproducing (recording/reproducing) circuit (not shown) connected to the magnetic head 12 is operated. The rotation of the motor 17 rotates the capstan pulleys 18 and 19 and the intermediate pulley 20 via the belt 23. Each of the above capstan pulleys 18.19
are rotated in opposite directions. The intermediate pulley 20 has a gear portion 20a, and the gear portion 20a is connected to the first gear portion 3 of the cam gear 30 attached to the lower surface of the chassis 5.
It meshes with 0a. The cam gear 30 has an outer peripheral portion serving as the first gear portion 30a, and a main surface serving as a cam surface 30b constituting a tape end detection mechanism to be described later. This first gear portion 30a and cam surface 30b
is rotated by the rotation of the motor 17.

Further, in the center of this cam gear 30, this cam gear 3
A small-diameter second gear portion 30C is provided coaxially with the gear 0 via a friction member.

This second gear portion 30c meshes with the intermediate gear 3I. This intermediate gear 31 is attached to an intermediate gear support lever 32 that is attached to be swingable about a shaft that supports the cam gear 30.

That is, the intermediate gear 31 can be moved by the swinging of the intermediate gear support lever 32 while remaining in mesh with the second gear portion 30c of the cam gear 30. This intermediate gear support lever 32 is connected to the regeneration lever 24.
When the lever is moved forward, the swing is controlled in either direction by a normal-reverse switching device, which will be described later.

Note that since a friction member is interposed between the first gear portion 30a and the second gear portion 30c of the cam gear 30,
When the rotational resistance of the part that is rotated in mesh with the second gear part 30c is small, the second gear part 30C is rotated by the rotation of the motor 17. When the rotational resistance of the rotated portion is large, the second gear portion 30c is not rotated even when the motor 17 rotates.

Furthermore, reel stand gears 33 and 34 are coaxially attached to the lower surface of the chassis 5 to the pair of reel stands 6 and 7, respectively. Further, a reversing gear 35 is meshed with the reel stand gear 34 of the other reel stand 7. When the regeneration lever 24 is moved forward, the intermediate gear 31 is moved between one reel stand gear 33 and the reversing gear 35 by the swinging of the intermediate gear support lever 3. and selectively meshes with either one of the reel stand gears 33 and the reversing gear 35.

That is, as the motor 17 rotates, one of the reel stands 6, 7 is rotationally driven in a predetermined direction, and the reel hub 1.2 engaged with the reel stands 6.7 is rotated. As a result, the magnetic tape 3 is wound in either the normal direction or the reverse direction.

Further, a fast-forward idle gear 36 is attached to the fast-forward lever 26. The fast-forwarding idle gear 36 is configured to mesh with the reversing gear 35 and the first gear portion 30a of the cam gear 30 at the same time when the fast-forwarding lever 26 is in the forward movement position. That is, when the fast forward button 15 is operated, the motor 1
7 rotates, the first gear portion 30a of the cam gear 30
The rotation is transmitted to the reversing gear 35 via the fast-forwarding idle gear 36, and the other reel stand 7 is driven to rotate at high speed.

Further, a rewinding idle gear 37 is attached to the rewinding lever 27. This rewinding idle gear 37 is connected to the one reel base gear 33 and the cam gear 3 when the rewinding lever 27 is in the forward movement position.
0 and the first gear portion 30a at the same time. That is, when the rewind button 16 is operated,
When the motor 17 rotates, the rotation of the second gear portion 30a of the cam gear 30 is transmitted to the one reel stand gear 33 via the rewinding idle gear 37, and one reel stand 6 is driven to rotate at high speed. be done.

G-2 Next, according to FIG. 1 and FIGS. 3 and 4, normal-
The reverse switching device will be explained.

As shown in FIG. 3, a transmission lever 39 is engaged with the end of the reproduction lever 24 on the inner side of the chassis 5 via a limiter spring 38.

The transmission lever 39 is swingably attached to the lower surface of the chassis 5, and one end and the other end of the transmission lever 39, which sandwich the center of swing, serve as retaining parts. Above limiter spring 38
is a tension coil spring, and when the regeneration lever 24 is moved forward, one end of the transmission lever 39 engaged with the limiter spring 38 follows the forward movement of the regeneration lever 24, and the transmission lever 39 is moved forward. be swayed. The limiter spring 38 is stretched when a force is applied to the regeneration lever 24 to move it further forward after the transmission lever 39 has been swung to a predetermined position and positioned as described below. This is to prevent excessive force from being applied to the transmission lever 39. As the transmission lever 39 swings, the other end of the transmission lever 39 moves in the opposite direction to the one end. The other end of the transmission lever 39 is engaged with one end of the magnetic head moving lever 40.

The magnetic head moving lever 40 is attached to the lower surface of the chassis 5 so as to be able to reciprocate, and is attached to the transmission lever 3.
It is reciprocated following the rocking motion of 9.

The other end of the magnetic head moving lever 40 is provided with a magnetic helad engaging pawl 40a. The magnetic head engaging pawl 40a engages with the magnetic head 12 which is swingably supported as will be described later.

That is, by the forward movement of the playback lever 24, the magnetic head 12 is moved inward of the tape cassette 4, and the playback mode is set.

Further, a pinch roller moving lever 41 is swingably attached to the magnetic head moving lever 40. This pinch roller moving lever 41 is provided with a pair of pinch roller engaging claws 42.43 and abutment arm portions 44.45 on both sides of the center of swing. This pinch roller moving lever 41 moves between the pair of pinch roller engaging claws 4 by swinging in either direction in the playback mode.
2° 43, the corresponding side of the pair of pinch rollers 1011, which are swingably supported as will be described later, is moved so as to come into contact with the capstan 8°9. Between the pair of pinch rollers 10.11 and the capstan 8.9, the magnetic tape 3
are interposed, and the pair of pinch rollers to, ii
The magnetic tape 3 is pinched when one of the pinch rollers comes into contact with the corresponding capstan, and the magnetic tape 3 is fed in accordance with the rotating direction of the capstan that the pinch roller contacts.

The swinging direction of the pinch roller moving lever 41 is controlled by a switching lever 46. This switching lever 46 is attached to the lower surface of the chassis 5 so as to be reciprocally movable. This switching lever 46 is provided with a pair of abutting protrusions 47.48 that correspond to and abut against the pair of abutting arms 44.45 of the pinch roller moving lever 41. That is, in the reproduction mode, when the switching lever 46 is moved to one side as shown in FIG. The pinch roller moving lever 42 is swung in contact with the pinch roller 11, and the pinch roller 11 on the other side is moved. Further, as shown in FIG. 4, the switching lever 46
is moving to the other side, the contact arm 4 on the other side
5 and the contact protrusion 48 on the other side, the pinch roller moving lever 42 is swung, and the pinch roller 10 on the one side
will be moved.

Further, the pair of abutment arm portions 44 and 45 of the pinch roller moving lever 42 are provided with engaging claw portions 44a and 45a, respectively. These engaging claws 44a and 45a are connected to a pair of intermediate gear moving levers 49 that are swingably attached to the lower surface of the chassis 5 when the magnetic head moving lever 40 is moved by forward movement of the reproducing lever 24. The end portions of the arm portions 50 and 51 are brought into contact with each other in a corresponding manner.

This intermediate gear moving lever 49 has each of the above-mentioned retaining claws 44a.
, 45a and the pair of arm portions 50, 51, the pinch roller is moved following the swinging motion of the pinch roller moving lever 41. This intermediate gear moving lever 49 is provided with an engaging arm portion 52 that engages with the intermediate gear supporting lever 32 . That is, when the intermediate gear moving lever 49 moves, the intermediate gear support lever 32 swings, and the intermediate gear 31 is moved in a predetermined direction.

By the way, when the reproducing lever 24 is moved forward, the reproducing lever 24 is positioned with the movement of the magnetic head moving lever 40 being restricted, and then further moved forward and latched. When the magnetic head moving lever 40 is positioned, the transmission lever 39 is also stopped.
When the reproducing lever 24 is latched, the limiter spring 38 is slightly stretched and biases the magnetic head moving lever 40 in a direction to further move it. The magnetic head moving lever 40 is positioned by the pinch roller 46 and the intermediate gear moving lever 49 whose swing is regulated in conjunction with the intermediate gear 31 meshing with a predetermined gear. This is done by restricting the movement of the moving lever 41.

Therefore, the biasing force of the limiter spring 38 applied to the magnetic head moving lever 40 is applied to the intermediate gear moving lever 4 via the pinch roller moving lever 41.
9 and the switching lever 46. The biasing force transmitted to the intermediate gear moving lever 49 is transmitted to the intermediate gear 31 via the intermediate gear support lever 32. That is, if an attempt is made to separate the intermediate gear 31 from the meshing gear, the magnetic head moving lever 40 will be moved against the biasing force of the limiter spring 38. The urging force of the limiter spring 3 prevents it from separating from the predetermined gear with which it is engaged.

The intermediate gear moving lever 49 is provided with a swing regulating pawl 49a that is fitted into a fan-shaped hole provided in the magnetic head moving lever 40.

In the playback mode, the intermediate gear moving lever 49 has the swing regulating pawl 49a fitted into the enlarged diameter portion of the fan-shaped hole, so that the intermediate gear 31 can be moved to the one reel base gear 33 or the reversing gear. It is movable so as to mesh with any of the gears 35.

When the mode is other than the reproduction mode, that is, when the magnetic head moving lever 40 is returned by the backward movement of the reproduction lever 24, the swing regulating claw 49a
is fitted into the reduced diameter portion of the fan-shaped hole, the movement of the intermediate gear moving lever 49 is restricted, and the intermediate gear 3
1 is the one reel stand gear 33 and the reversing gear 35.
It will be in a state where it does not mesh with either of the two.

Incidentally, the position of the switching lever 46 is controlled by the rotational position of the switching gear 53. This switching gear 53 is connected to the first gear portion 30 of the cam gear 30.
A pair of toothless portions 53 n, which are installed in a position that meshes with a, and extend over a predetermined angular range at two locations separated by 180°.
53 r is provided. The switching gear 53 also includes an eccentric protrusion 54 that abuts and engages inside the engagement recess 46a provided at one end of the switching lever 46.
is provided. When the switching gear 53 is in the normal position, that is, as shown in FIG. When the tooth gear 53 and the cam gear 30 do not mesh with each other, the eccentric protrusion 54 comes into contact with the inner side of one side of the engagement recess 46a, and positions the switching lever 46 on one side. Further, as shown in FIG. 4, when this switching gear 53 is in the reverse position, that is, the other toothless portion 53r faces the first gear portion 30a of the cam gear 30, and this When the switching partially toothed gear 53 and the cam gear 30 are not engaged, the eccentric protrusion 54 comes into contact with the inner part of the other side of the engagement recess 46a, and positions the switching lever 46 on the other side.

That is, by positioning the switching gear 53 in the normal position or the reverse position, the switching lever 46 is positioned on one side or the other side, and the pinch roller moving lever 41 is swung to the other side or the reverse position. The one-way pinch rollers 11, 10 are moved, the intermediate gear 31 is engaged with the reversing gear 35 or one of the reel stand gears 33, and reproduction (recording) in the normal direction or reverse direction is performed.

The switching gear 53 has a pair of positioning protrusions 55 provided at two locations with an angular interval of 180°.
The positioning protrusions 55n and 55r abut against the trigger lever 56, and the positioning protrusions 55n and 55r are rotationally biased in a direction to press the trigger lever 56 by a trigger mechanism, which will be described later. Positioned in normal or reverse position.

Next, the trigger mechanism will be explained with reference to FIG. 1 and FIGS. 5 to 8.

As shown in FIG. 5, the trigger lever 56 is attached to the lower surface of the chassis 5 in a reciprocating manner, and
The first temporary spring 57 attached to the chassis 5 is biased in the backward movement direction, and the abutting edge 56a provided at one end is the positioning protrusion 55n of the switching gear 53.
, 55r. This trigger lever
56 is operated in forward motion against the urging force of the first leaf spring 57 by a switching button 58 attached to the chassis 5 in the same way as the phases 13, 14 and 15, 16. When this trigger lever 56 is moved forward,
The abutting edge 56a is located outside the locus of movement of the positioning protrusions ssn and 55r due to the rotation of the switching gear 53.

When the switching gear 53 is in the normal position or the reverse position, the positioning protrusion 55
n, 55r are urged to rotate in a direction that presses the abutment edge 56a. That is, when the switching partially toothed gear 53 is in the normal position or reverse position, as shown in FIGS. The position where the inner edge of the side is in contact with the above-mentioned switching partially toothed gear 5
The line connecting the center of rotation of the switching lever 4G is not parallel to the reciprocating direction of the switching lever 4G. The switching lever 46 is biased toward the center position by a torsion spring 59 attached to the chassis 5.

Therefore, the switching gear 53 is urged to rotate in the predetermined direction by the switching lever 46.

In addition, the switching lever 4G is configured to
Not only the torsion spring 59 but also the limiter spring 38 and the pinch roller 10° 11 (described later) are biased toward the center position by a biasing means that biases them away from the corresponding capstans 8 and 9. Forced. That is, as described above, when the regeneration lever 24 moves forward and is locked, the switching lever 4G cooperates with the intermediate gear moving lever 49 to restrict the movement of the pinch roller moving lever 41. By doing so, the magnetic head moving lever 40 is positioned. The limiter spring 3 added to this magnetic head moving lever 40
The biasing force 8 is transmitted to the switching lever 46 via the pinch roller moving lever 41. and,
A pair of contact arms 44 of the pinch roller moving lever 41
, 45, a pair of contact protrusions 47 of the switching lever 46
．． Since the portion that 48 comes into contact with is an inclined surface, the biasing force of the limiter spring 38 biases the switching lever 46 toward the center position. Further, the pinch roller moving lever 41 moves the pinch roller to
, tt in the direction of the center position of the swing. This biasing force, similar to the biasing force by the limiter spring 38, biases the switching lever 46 toward the center position.

Since the switching gear 53 is biased to rotate as described above when it is in the normal position or reverse position, it is rotated slightly when the trigger lever 56 is moved forward. Then, the pair of toothless parts 53n and 53r move from the position facing the first gear part 30a of the cam gear 30, and the switching toothless gear 53 and the first gear part 3
0a meshes. When this meshing is performed, since the first gear portion 30a is rotationally driven by the motor 17, the switching gear 53 is rotationally driven, and the 180
The positioning protrusion 55n again at the rotated position;
55r and the abutting edge 56 of the trigger lever 56
The position is determined by contact with a. As described above, by rotating the switching gear 53 by 180 degrees, the eccentric protrusion 54 moves the switching lever 46 from one side (or the other side) to the other side (or one side), so that playback (recording) is performed. The normal direction and reverse direction can be switched.

The switching button 58 that operates the trigger lever 56 forward.
As shown in FIG. 5, is one end of a switching operation lever 61 that is attached to the chassis 5 so as to be able to freely move back and forth and is biased in the backward direction by a second leaf spring 60 that is attached to the chassis 5. It is formed in the part. A switching transmission lever 62 is swingably attached to the switching operation lever 61. When the switching operation lever 61 is operated forward, one end of the switching transmission lever 62 comes into contact with a locking protrusion 61a provided on the switching operation lever 61, as shown in FIG. The trigger transmission lever 63 is adapted to come into contact with one end of a trigger transmission lever 63 that is swingably attached to the chassis 5, and the trigger transmission lever 6
Rock 3.

The other end of this trigger transmission lever 63 is engaged with the other end of the trigger lever 56, and by swinging,
Move the trigger lever 56 forward.

By moving the trigger lever 56 forward, the reproduction (recording) is switched between the normal direction and the reverse direction as described above.

When the switching operation lever 61 is further moved forward, the seventh
As shown in the figure, as the trigger transmission lever 63 swings, one end of the trigger transmission lever 63 deviates from the movement locus of the other end of the switching transmission lever 62, so that the other end of the switching transmission lever 62 passes through one end of the trigger transmission lever 63 and separates. Then, the trigger transmission lever 63 and the trigger lever 56 are connected to the first
Due to the biasing force of the temporary spring 57, it moves back and returns to the initial position.

When the switching operation lever 61 is moved back by the biasing force of the second temporary spring 60, the other end of the switching transmission lever 62 is moved to one end of the trigger transmission lever 63, as shown in FIG. At this time, one end of the switching transmission lever 62 contacts the locking protrusion 61a.
The trigger transmission lever 6 is swung further apart.
3 is never swayed. The above switching operation lever 61
When the switching transmission lever 62 returns to its initial position, one end of the switching transmission lever 62 comes into contact with a return protrusion 64 provided on the chassis 5, so that the switching transmission lever 62 returns to its original state. That is, when the switching transmission lever 61 returns to the initial position and is in the 7 company state, the switching transmission lever 62
As shown in FIG. 5, one end of the return protrusion 64
and the locking protrusion 61a.

Next, the tape end detection mechanism will be explained with reference to FIGS. 1 and 9.

As shown in FIG. 9, this tape end detection mechanism includes a cam surface 30b of the cam gear 30, and a detection lever 65 disposed to engage with the cam surface 30b and move the trigger lever 56 forward. It consists of

The detection lever 65 is supported by an annular portion 66 that is rotatably attached to one of the reel base gears 33 via a friction member such as a coil spring, and a bending arm portion 67 that is extendable and retractable to the annular portion 66. A trigger lever pressing portion 70 is supported by the following protrusion 68 and a support arm 69. Further, the detection lever 65 is formed so that the following protrusion 68, the annular portion 66, and the trigger lever pressing portion 70 form a substantially straight line. Each part 66, 67 of these detection lever 65.
6B, 69.70 can be integrally formed from a slightly flexible material such as synthetic resin, and the bent arm portion 67 has a plurality of bent portions and is formed slightly thin. It has spring properties and is made to be expandable and contractible. The copying protrusion 68 is provided with a copying protrusion 68a that fits into a cam groove 71 carved in the cam surface 30b. The trigger lever pressing part 70 is supported by the support arm part 69 so as to be moved in conjunction with the movement of the copying projection part 68.

The cam groove 71 carved in the cam surface 30b has a centering portion 71a having a width approximately equal to the diameter of the tracing protrusion 68a. In this cam groove 71,
A trigger claw 72 is protruded at a position on the movement trajectory of the centering part 71a and separated from the centering part 71a by a predetermined angle.

In the reproduction mode, if the tape cassette 4 is loaded and the magnetic tape 3 is being fed, the one reel stand 6 is rotating in either direction. At this time, the detection lever 65 is oscillated by the annular portion 66 being rotationally biased by the one orifice gear 33 via the friction member, for example, in the normal direction. When reproducing (recording) is being performed, the detection lever 65 is swung and biased so that the copying protrusion 68a is directed toward the outside of the cam surface 30b, and reproducing (recording) in the reverse direction is being performed. When the detection lever 65 is in the cam surface 30b, the detection lever 65 is biased so that the copying projection 68a moves toward the inside of the cam surface 30b.

In addition, in the regeneration mode, the cam gear 30 is rotated by the motor 17 in a predetermined direction shown by the arrow in FIG.
For example, when reproduction (recording) is performed in the normal direction, the copying protrusion 6 is moved according to the shape of the protrusion 6.
8a is moved along the outer edge of the cam groove 71,
When playing (recording) in the reverse direction,
The copying protrusion 68a is moved along the inner edge of the cam groove 71. That is, when the magnetic tape 3 is being fed, the copying protrusion 68a is aligned with the cam groove 71.
Since the protrusion 68a moves along either the outer or inner edge of the centering portion 7fa, the protrusion 68a moves along either edge and does not come into contact with the trigger claw 72 even after passing through the centering portion 7fa.

In the reproduction mode, when the magnetic tape 3 is wound to the end, the one reel stand 6 is stopped, and the one reel stand gear 33 is also stopped. By stopping the reel base gear 33, the detection lever 65 is no longer biased to swing. At this time, since the other reel stand 7 also stops, the reversing gear 35 also stops. The intermediate gear 31 meshing with either the reel base gear 33 or the reversing gear 35 is also stopped, and the second gear portion 30c of the cam gear 30 is also stopped; 30c is attached to the cam gear 30 via a friction member, so that the first gear portion 3
0a and the cam surface 30b continue to rotate.

The copying protrusion 68a is connected to the centering portion 7.
When the trigger claw 72 is moved to a position on the movement trajectory by 1a, it remains at this position because the one reel base gear 33 is not biased to swing.

When the cam surface 30b further rotates, the trigger claw 7
2 is in contact with the copying protrusion 68a, and the cam gear 30
The rotational force presses the bent arm portion 67 in a compressing direction. Copying protrusion 6 pressed by the trigger claw 72
8 moves in a direction approaching the annular portion 66 as the bent arm portion 67 is compressed. Due to this movement of the copying protrusion 68, the trigger lever pressing section 70 moves in a direction away from the annular portion 66. This trigger lever pressing portion 70 faces the pressed claw 56b provided on the trigger lever 56, and presses the pressed claw 56b by movement accompanying the movement of the copying protrusion 68. The trigger lever 56 moves back when the pressed claw 56b is pressed by the trigger lever pressing section 70, and the reproduction (recording) is switched between the normal direction and the reverse direction as described above. Copy projection 68a
When moving along the inner edge of the cam groove 71, before reaching the centering part 71a, the first protrusion 71b moves the cam groove 71 to the outer side of the centering part 71a. Being moved.

Therefore, when the copying protrusion 68a reaches the centering part 71a during reproduction (whether the marking is in the normal direction or the reverse direction), the copying protrusion 68a starts from the outside of the centering part 71a, that is, from the outside of the cam groove 71a.
The centering portion 71a is reached along the outer edge of the centering portion 71a.

Therefore, regardless of the direction of reproduction (recording), it is not affected by the friction member provided on the annular portion 66.
Accurate positioning of the copying protrusion 68a is performed. Further, the copying protrusion 68a has the centering portion 71a.
After passing through, the second protrusion 71c corrects the slight position and brings it to a position exactly on the movement locus of the trigger claw 72.

Further, in order to prevent the copying protrusion 68a and the trigger claw 72 from coming into contact with each other in the fast forward mode or the rewind mode, a spring member 73 that is moved in conjunction with the movement of the magnetic head moving lever 40 is It is provided.

The spring member 73 is a rod-shaped spring movably attached to the lower surface of the chassis 5, and has one end engaged with the magnetic head moving lever 40 and the other end brought into contact with the detection lever 65. This urges the detection lever 65 so that the copying protrusion 68a moves inward of the cam surface 30b. When the reproduction mode is set, this spring member 73 moves the magnetic head moving lever 40.
is swung by the movement of the detection lever 6, and the other end is connected to the detection lever 6
5 and are spaced apart from each other.

Next, the shaft-off mechanism will be explained with reference to FIGS. 1 and 10.

As shown in FIG. 10, this shaft-off mechanism is swingably attached to the lower surface of the chassis 5, with one end facing within the rotation locus of the eccentric protrusion 54 of the switching gear 53 and the other end. The shaft-off lever 74 has a portion facing one end of the lock plate 28.

This shaft off lever 74 is in playback mode.
When the switching gear 53 rotates from the reverse position to the normal position, one end thereof is pressed by the eccentric protrusion 54 and swings. When the shut-off lever 74 is swung, the other end of the lock plate 28 is connected to one end of the lock plate 28 via the end of a shut-off transmission lever 75 attached to one end of the lock plate 28. It is designed so that it can be pressed.

When the lock plate 28 is pressed and moved, the regeneration lever 24 is released from being locked in the forward movement position by the lock plate 28, and the regeneration mode is released and the regeneration (
recording) is stopped.

The shaft-off transmission lever 75 is connected to the lock plate 28.
It is swingably attached to one end of the coil spring 76 and biased in one direction by a coil spring 76. This shaft-off transmission lever 75 is configured to be swung by the forward movement of the switching operation lever 61. When the shaft-off transmission lever 75 is moved, its end is not opposed to the other end of the shaft-off lever 74. That is, when the switching operation lever 61 is moved forward and the switching gear 53 rotates as described above, the shaft-off transmission lever 75 is oscillating, so that the shaft-off lever 74 is rotated. Even if it moves, the lock plate 28
is made so that it is not pressed.

Note that when the shaft-off transmission lever 75 is in a moved state, its end portion is connected to the shaft-off lever 74.
Since it faces the inclined part connected to the other end, when returning to the initial position by the biasing force of the coil spring 76, the inclined part of the shaft off lever 74 is pressed. This shaft off lever 74 is returned to its initial position.

G-6 Next, the mode switching mechanism will be explained with reference to FIGS. 1 and 10.

This mode switching mechanism is a mechanism for switching between a mode in which the shaft-off mechanism is activated and a mode in which the shut-off mechanism is not activated when the reproduction (recording) is changed from the reverse direction to the normal direction.

As shown in FIG. 10, this mode switching mechanism is comprised of a mode switching lever 77 that swings the shaft-off transmission lever 75.

This mode switching lever 77 is swingably attached to the lower surface of the chassis 5, and has one end attached to the mode switching knob 7.
8, facing outward, and is designed to be operated by swinging. When the mode switching lever 77 is swung, the other end comes into contact with the shaft-off transmission lever 75, causing the shut-off transmission lever 75 to oscillate. By swinging the shaft-off transmission lever 75, the swinging of the shut-off lever 74 is no longer transmitted to the lock plate 28 as described above, and the shaft-off mechanism becomes inoperative.

Next, the support mechanism for the magnetic head and pinch roller will be explained with reference to FIG.

The magnetic head 12 and the pair of pinch rollers 10.
11 is attached to a cassette holder 79 rotatably attached to the chassis 5, as shown in FIG. The magnetic helad 12 is attached to the cassette holder 79
The magnetic head support arm 80 is swingably attached to the magnetic head support arm 80 and biased to the initial position.

Further, a plurality of tape guides &1, 82, 83, 84 are attached to this magnetic head support arm 80.

The pinch rollers 10 and 11 are each supported by a pinch roller support arm 85 which is swingably attached to the cassette holder 79 and urged to an initial position.
．． 86 so as to be rotatable. The pinch roller support arms 85 and 86 are wound around the swing shafts of the pinch roller support arms 85 and 86, respectively, and one end and the other end extend along the front and back sides of the pinch roller support arms 85 and 86, respectively. Pinch roller pressing spring 87
．． 88 are provided.

In the reproduction mode, the magnetic head moving lever 40
moves, and the magnetic head engaging claw 40a engages with the magnetic head support arm 80 and presses it from the back side, thereby moving the magnetic head 12 forward.

Further, the pinch roller moving lever 41 moves while swinging together with the magnetic head moving lever 40, and either of the pair of pinch roller engaging claws 42, 43 is moved to the corresponding position of the pinch roller support arm 85, 86. It engages with one end of the pinch roller pressing spring 87.88 on the side and presses it from the back side, selectively moving either of the pinch rollers 10, 11 to abut the corresponding capstan 8.9. let At this time, the pinch roller support arm 8
Pinch roller pressure spring 87.8 on the front side of 5.86
8 is pressed from the rear side by the pinch roller engaging claws 42, 43, the pinch rollers 10; 9 is in a state where it is pressed and biased.

By the way, the cassette holder 79 is attached to the chassis 5.
The cassette holder lock lever 89 is engaged with a cassette holder lock lever 89 that is reciprocably attached to the cassette holder lock lever 89 to be latched in the closed state. Above cassette holder lock lever 8
As shown in FIG. 1, the lock lever 9 is biased in the direction of engagement with the cassette holder 79 by a lock lever biasing spring 90 attached to the chassis 5. One end of the lock lever biasing spring 90 engages with the cassette holder lock lever 89, and the other end engages with the lock plate 28.
It is a torsion spring that presses one end of the spring. A cassette holder release button 91 facing the outside of the chassis 5 is provided at one end of the cassette holder lock lever 89. When the cassette holder release button 91 is pressed, the lock lever 89 is opened. It is configured to move forward against the biasing force of a biasing spring 90. When the cassette holder lock lever 89 is moved forward, it disengages from the cassette holder 79, allowing the cassette holder 79 to rotate freely.

Further, when the switch plate 29 is moved by forward movement of the playback lever 24, the fast forward lever 26, or the rewind lever 27, the other end of the cassette holder lock lever 89 is connected to the switch plate 29. It faces the other end and cannot move forward. That is, in play mode, fast forward mode or rewind mode, the cassette holder release button 9
Even if you press 1, the cassette holder lock lever will not work.
89 is prevented from moving forward by the other end of the switch plate 29, and the cassette holder 79 is prevented from rotating.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be modified as appropriate.

For example, the shape and structure of each lever shown in the above embodiments is not limited to the above embodiments, and various shapes and structures can be applied. Furthermore, each gear in the above-described embodiments can be replaced with an idler made of rubber or the like.

Further, the present invention is not limited to auto-reverse type small tape recorders using compact cassettes, but can be applied to various types of reverse type recording and reproducing devices.

H0 Effects of the Invention As described above, in the tape recorder according to the present invention, the intermediate gear is connected to the recording and/or reproducing lever.
Alternatively, a limiter spring interposed between the recording and/or reproducing head moving lever, the pinch roller moving lever, and the intermediate gear support lever is biased toward the reel stand on the selected side by a limiter spring interposed between the recording and/or reproducing head moving lever, the pinch roller moving lever, and the intermediate gear support lever. be done. Further, the switching lever is biased toward its center position by the limiter spring via the recording and/or reproducing head moving lever and the pinch roller moving lever.

Therefore, the rotational drive of the reel stand and the switching of the feeding direction of the magnetic tape, etc. can be performed satisfactorily without providing individual urging means for the intermediate gear and the switching lever.

In other words, the present invention provides a tape having a simple configuration that eliminates biasing means provided individually for intermediate gear support levers, switching levers, etc., and which is easily miniaturized and manufactured. It is possible to provide a recorder.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall configuration of the bottom surface of the chassis of a tape recorder according to the present invention, and FIG. 2 is a plan view showing the overall structure of the top surface of the chassis of the tape recorder. FIG. 3 is a plan view showing the structure of the normal-reverse switching mechanism of the tape recorder in the normal state, and FIG. 4 is a plan view showing the structure of the normal-reverse switching mechanism of the tape recorder in the reverse state. FIG. 5 is a plan view showing the configuration of the trigger mechanism of the tape recorder, FIG. 6 is a plan view showing the main parts of the trigger mechanism starting to operate, and FIG. 7 is a plan view showing the main parts of the trigger mechanism. FIG. 8 is a plan view showing a state in which the main part of the trigger mechanism is in the middle of its operation; FIG. FIG. 9 is a partially cutaway plan view showing the configuration of the tape end detection mechanism of the tape recorder. FIG. 10 is a plan view showing the configuration of the shaft-off mechanism and mode switching mechanism of the tape recorder. FIG. 11 is a perspective view showing the structure of a support mechanism for the magnetic head and pinch roller of the tape recorder. 4...Tape cassette 5...Chassis 6.7...Reel stand 8.9...Capstan 0.11...Pinch roller 2... ......Magnetic head 7...Motor 4...Reproduction lever 8...Lock plate 9...Switch plate 0...Cam gear ■...Intermediate gear 3...One reel base gear 5...
...Reversing gear 8...Limiter spring 0...Magnetic head movement lever...
...Pinch roller moving lever 6...Switching lever 9...Intermediate gear moving lever 3...
...Switching gear with missing teeth 6...Trigger lever 2...Switching transmission lever 5...Detection lever 8...Copying Projection l...Cam groove 4...Shutoff lever 5...
...Shaft off transmission lever 9...Cassette holder

Claims (1)

[Scope of Claims] A recording and/or reproducing lever that is supported so as to be reciprocally movable, is biased in the backward direction, and is locked in the forwardly moved position; and/or a recording and/or reproducing head moving lever that is reciprocated via a limiter spring due to the reciprocating movement of the reproducing lever; a switching lever that is supported in a reciprocally movable manner; a pinch roller moving lever that is movably mounted and swings in any direction depending on the position of the switching lever by abutting the switching lever when the recording and/or reproducing head moving lever moves forward; and is swingably supported and rotatably supports the intermediate gear, and is swung by the swinging of the pinch roller moving lever to selectively engage the intermediate gear with either one of the pair of reel stands. and an intermediate gear support lever for aligning the recording and/or reproducing head moving lever with the pinch roller moving lever when the recording and/or reproducing lever is locked in the forward position. The intermediate gear is biased in the direction of the selected reel table via the intermediate gear support lever, and the switching lever is biased via the recording and/or reproducing head moving lever and the pinch roller moving lever. A tape recorder that is biased toward the central position.