JP2725288B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A. Industrial application fields B. Summary of the invention C. Conventional technology D. Problems to be solved by the invention E. Means to solve the problems F. Function G. Example (G-1) The present invention (G-2) Description of normal-reverse switching device (FIGS. 3 and 4) (G-2) Outline of configuration of applied tape recorder and description of tape drive system (FIGS. 1 and 2) -3) Description of trigger mechanism (FIGS. 1, 5 to 8)
(G-4) Description of tape end detection mechanism (FIG. 1, FIG. 9)
(G-Fig. 10) (G-5) Description of shut-off mechanism (Fig. 1, Fig. 11-)
(Fig. 12) (G-6) Description of mode switching mechanism (Fig. 1, Fig. 11 to Fig. 11)
(G-12) Description of support mechanism for magnetic head and pinch roller (FIGS. 1 and 13) H. Effects of the Invention A. Industrial Field of the Invention The present invention relates to a recording tape such as a magnetic tape. And a tape recorder for recording and / or reproducing a predetermined information signal.

B. Summary of the Invention The present invention relates to a tape recorder in which a switching lever and a pinch roller moving lever that is rotatably supported are abutted to rotate the pinch roller moving lever. The switching lever is urged toward the center position by an urging force that urges the pinch roller moving lever toward the center position by forming one of the contact portions with the lever as an inclined surface. It is another object of the present invention to provide a tape recorder having a simple structure by eliminating the urging means individually provided on the switching lever.

C. Prior Art Conventionally, a so-called reverse type tape recorder capable of performing recording and / or reproduction in a state where a magnetic tape serving as a recording tape is sent in one direction and another direction has been proposed.

In this tape recorder, one of a pair of reel bases on which a pair of tape reels around which the magnetic tape is wound is mounted is selectively driven to rotate as a take-up reel side and rotated in opposite directions. By selectively pressing one of a pair of driven pinch rollers against the magnetic tape, the feed direction of the magnetic tape is switched between a normal direction and a reverse direction.

In order to selectively urge one of the pair of pinch rollers toward the magnetic tape, a pinch roller moving lever having one end and the other end facing the one and the other pinch rollers, respectively. Are rotated in conjunction with, for example, a switching lever supported to be reciprocally movable.

The movement of the switching lever is performed, for example, by rotation of a toothless gear having a cam portion engaged with the switching lever. This missing tooth gear is a gear having a pair of missing tooth parts, and in a state where one or the other missing tooth part is opposed to a drive gear that is rotationally driven by a motor or the like.
The switching lever is positioned to one side or the other side by the cam portion. The toothless gear is locked by predetermined locking means at a position where the toothless portion faces the drive gear, and is urged to rotate in a predetermined direction directly or via the switching lever.

In order to switch the feed direction of the magnetic tape, the locking of the toothless gear by the locking means is released. Then, since the toothless gear is rotationally urged, one (or the other) toothless part moves from a position facing the drive gear, and the gear part of the toothless gear meshes with the drive gear. .
The toothless gear meshed with the drive gear is rotationally driven by the drive gear to a position where the other (or one) toothless part faces the drive gear. By the rotation of the toothless gear, the switching lever is moved from one side (or the other side) to the other side (or the one side), and the feeding direction of the magnetic tape is switched.

D. Problems to be Solved by the Invention Incidentally, in the so-called reverse type tape recorder as described above, in order to properly switch the feed direction of the magnetic tape, the toothless gear is rotated in a predetermined direction. It is necessary to provide biasing means for biasing.

Thus, providing the biasing means individually for the toothless gear or the like complicates the configuration of the tape recorder,
It is said that miniaturization is difficult and that manufacture is difficult.

Therefore, the present invention has been proposed in view of the above-described situation, and has a simple structure by reducing the number of components without providing an urging means individually corresponding to the switching lever. E. Means for Solving the Problems To solve the above problems and achieve the above objects, a tape recorder according to the present invention has a reciprocating motion. A recording and / or reproducing head moving lever that is freely supported and locked at the forward movement position, a switching lever that is supported to be able to reciprocate freely, and the recording and / or reproducing head moving lever are locked. A first urging means for urging the recording and / or reproducing head moving lever in the forward moving direction at the forward moving position; and a rotatably attached to the recording and / or reproducing head moving lever; When the recording and / or reproducing head moving lever moves forward, it is rotated in either direction by making relative contact with the switching lever, and the pinch roller moving lever is controlled to rotate in the forward moving position. A second urging means for urging the pinch roller moving lever in the direction of the center position, wherein at least one of the pinch roller moving lever and the switching lever which are in relative contact with each other is formed as an inclined surface, The switching lever is urged toward the center position via the pinch roller moving lever in which the urging force of the first urging means on the recording and / or reproducing head moving lever at the forward movement position is restricted in rotation. In addition, the urging force of the second urging means urges the switching lever toward the center position.

F. Action In the tape recorder according to the present invention, at least one of the contact portions of the pinch roller moving lever and the switching lever is formed as an inclined surface, and biases the pinch roller moving lever toward the center position. Since the switching lever is urged toward the center position by the urging force, it is not necessary to separately provide means for urging the switching lever.

G. Examples Hereinafter, specific examples of the present invention will be described with reference to the drawings. In this example, the present invention is applied to a so-called auto-reverse small tape recorder using a standard-size tape cassette.

(G-1) Outline of Configuration of Tape Recorder to which the Present Invention is Applied and Description of Tape Traveling Drive System (FIGS. 1 and 2) First, referring to FIGS. The tape running drive system will be described.

In this tape recorder, as shown in FIG. 2, a tape cassette 4 containing a magnetic tape 3 wound around a pair of left and right reel hubs 1 and 2 is a tape cassette formed on the upper surface side of a chassis substrate 5. It is mounted horizontally on the cassette mounting part 5a. On the chassis substrate 5, a pair of first and second reel stands 6, 7 and a pair of first and second capstan shafts 8, 9 are rotatably supported. Further, the chassis substrate 5 includes first and second pinch rollers 10 and 11 which come into contact with and separate from the first and second capstan shafts 8 and 9, respectively, and a magnetic head 12 serving as a reproducing or recording head.
Are arranged.

When the tape cassette 4 is mounted on the tape cassette mounting portion 5a on the chassis substrate 5, the reel hubs 1 and 2 of the tape cassette 4 are respectively attached to the reel engaging shafts 6a and 7a of the reel bases 6 and 7, respectively. The magnetic tape 3 engaged and housed in the tape cassette 4 is connected to the capstan shaft.
The magnetic head 12 is wound around 8, 9 so that the magnetic head 12 can slide.

A player body in which the chassis substrate 5 is incorporated;
On the front side of 5b, operation mode selection buttons such as a reproduction or recording reproduction button 13, a stop button 14, a fast forward button 15, and a rewind button 16 are mounted.

As shown in FIG. 1, a flat and thin drive motor 17 is attached to the lower surface side of the chassis substrate 5, and is fixed to the lower ends of the first and second capstan shafts 8, 9, respectively. First and second capstan pulleys 18, 19, which also serve as a capstan flywheel, are provided. Further, on the lower surface side of the chassis substrate 5, an intermediate position is provided via a support shaft 20 b erected on the chassis substrate 5 so as to be located at a substantially intermediate position between the first and second reel bases 6 and 7. A pulley 20 is rotatably disposed, and is provided in parallel with a second capstan pulley 19 located on the left side in FIG. Are rotatably arranged. The driving force of the driving motor 17 is transmitted from a driving pulley 22 attached to the tip of a driving shaft 17a of the driving motor 17 to the first and second capstan pulleys 18, 19, the intermediate pulley 20, and the reversing pulley 2.
It is transmitted to each of the pulleys 18, 19, 20, 21 via an endless belt 23 bridged around 1. That is, the belt 23
Is formed of an elastic material such as rubber, is wound around a driving pulley 22, extends between a second capstan pulley 19 and an intermediate pulley 20, and has a first capstan pulley 18 and a reversing pulley. It is wound around 21. And
The belt 23 extends around the second capstan pulley 19 and the intermediate pulley 20 from the outer peripheral side by extending between the second capstan pulley 19 and the intermediate pulley 20. The driving force of the driving motor 17 is transmitted to the intermediate pulley 19 and the intermediate pulley 20. When the drive motor 17 is driven to rotate in the direction of arrow A in FIG.
1 is rotated clockwise in FIG. 1, the reverse pulley 21 is rotated counterclockwise, the first capstan pulley 18 is rotated counterclockwise, and the intermediate pulley is rotated. 20 is rotated clockwise.

The play button 13, the stop button 14, the fast-forward button 15, and the rewind button 16 have a corresponding play lever 24, stop lever,
25, fast forward lever 26, rewind lever 27 attached to the end.

And play lever 24, stop lever 25, fast forward lever
As shown in FIG. 1, the rewind lever 26 and the rewind lever 27 are disposed on the lower surface side of the chassis substrate 5, and the rewind lever 27 moves in the forward and backward directions in the direction of arrow B in FIG. It is mounted so that it can move forward and backward in the moving direction. Each of the levers 24, 25, 26, and 27 is a torsion coil spring supported by support pins 13b and 15b erected on the lower surface of the chassis substrate 5, respectively.
13a and 15a are urged in a direction to protrude outward from the chassis substrate 5 from the upper edge side in FIG. 1 of the chassis substrate 5 in the backward movement direction in the direction of arrow B 'in FIG. A lock plate 28 is provided on each of the levers 24, 25, 26, 27 so as to be inserted between the levers 24, 25, 26, 27. The lock plate 28 allows the slide guide pins 101, 102 implanted on the chassis substrate 5 to insert and support the elongated holes 103, 104 having a longer diameter in the longitudinal direction.
5, 26 and 27 are mounted so as to be able to reciprocate in the horizontal direction in the left and right directions indicated by arrows D and D 'in FIG. Further, the lock plate 28 is provided with the levers 24, 2
The hooks 24a, 25a, 26a, 27a are respectively formed in the engaging holes 28a, 28b, 28c, 28d formed in correspondence with the hooks 24a, 25a, 26a, 27a. Are engaged. further,
The lock plate 28 is urged to move in the direction of arrow D in FIG. 1 by a torsion coil spring 90 attached via a support pin 90a planted on the chassis substrate 5. by the way,
Each of the engagement holes 28a, 28b, 28c, 28 formed in the lock plate 28
In d, the corresponding claw portions 24a, 25a, 26a, 27a
Inclined guide portions 28e, 28f, 28g, 28h that are in contact with
The lock plate 28 resists the urging force of the torsion coil spring 90 by the operation of moving the levers 24, 25, 26, 27 in the forward direction in the direction of arrow B in FIG. 1 in the direction of arrow D 'in FIG.
The engaging holes 28a, 28 corresponding to the claw portions 24a, 26a, 27a of the reproduction lever 24, the fast-forward lever 26, and the rewind lever 27, respectively.
In c and 28d, there are provided hooking claws 28i, 28j and 28k to be engaged with the claws 24a, 26a and 27a. When the reproduction lever 24, the fast-forward lever 26, and the rewind lever 27 are moved in the forward direction in the direction of arrow B in FIG. The claws 24a, 26a, 27a are locked by the locking claws 28i, 28j, 28k. The locked state of the reproduction lever 24, the fast-forward lever 26, and the rewind lever 27 is operated by moving the stop lever 25 in the forward direction of the arrow B in FIG. It is released by doing so.

A switch plate 29 is provided on the lock plate 28 so as to overlap the lock plate 28. The switch plate 29 has elongated holes 105, 106 having a major axis in the longitudinal direction inserted through and supported by slide guide pins 101, 102 supporting the lock plate 28, and is orthogonal to the moving direction of the levers 24, 25, 26 in FIG. It is attached so as to be able to reciprocate in the horizontal direction in the left and right directions of arrow D and arrow D '. Further, the switch plate 29 is provided with claw portions 24a, 25a, 26 provided on the reproduction lever 24, the stop lever 25, and the fast-forward lever 26, respectively.
The claw portions 24a, 25a, 26a are respectively engaged with engaging holes 29a, 29b, 29c drilled corresponding to a. Further, the switch plate 29 is urged by a tension spring 107 to move in a direction indicated by an arrow D in FIG. By the way, the engagement holes 29a, 29 formed in the switch plate 29 are formed.
Among b and 29c, inclined guide surface portions 29d and 29e are provided in the engagement holes 29a and 29c corresponding to the claw portions 24a and 26a of the reproduction lever 24 and the fast-forward lever 26. Also, switch plate 29
An inclined guide surface portion 29f is also provided at one end of the rewind lever 27 facing the claw portion 27a. The switch plate 29 is pulled by the moving operation of the reproduction lever 24, the fast-forward lever 26, or the rewind lever in the forward direction of arrow B in FIG. The lock plate 2 against the urging force of the spring 107
8 and is moved in the direction of arrow D 'in FIG.

Incidentally, when any one of the reproduction lever 24, the fast-forward lever 26 and the rewind lever is pressed in the direction of arrow B in FIG. 1 and the switch plate 29 is moved in the direction of arrow D 'in FIG. The start switch is operated. By operating this start switch, power is supplied to the drive motor 17 and the reproduction / recording / reproducing circuit so that the drive motor 17 is rotated and a reproducing / recording / reproducing circuit (not shown) connected to the magnetic head 12 is operated. Is done.
The driving of the drive motor 17 causes the belt 23
, The first and second capstan pulleys 18 and 19 and the intermediate pulley 20 are rotationally driven. In addition, the first
The second capstan pulleys 18, 19 are rotationally driven in directions opposite to each other. The intermediate pulley 20 is formed integrally with a small-diameter gear portion 20a coaxially with the pulley 20. The gear portion 20a meshes with the first gear portion 30a of the cam gear 30 attached to the lower surface of the chassis substrate 5. The cam gear 30 is pivotally supported by a support shaft 110 erected on the chassis substrate 5 and is rotatably attached to the lower surface of the chassis substrate 5.

By the way, the cam gear 30 attached to the chassis substrate 5 as described above has the first gear portion 30a engraved on the outer peripheral portion, and a cam groove 71 for forming a tape end detection mechanism described later is formed on one main surface 30b. Is provided. Also, this cam gear
A central portion of the gear 30 is provided with a small-diameter second gear 30c coaxially mounted on the cam gear 30 via a friction member as shown in FIG. This second gear portion 30c is
It is in mesh with the intermediate gear 31. The intermediate gear 31 is rotatably supported by a support shaft 32a erected at the tip of an intermediate gear support lever 32 that is rotatably mounted around a support shaft 110 that supports the cam gear 30. . That is, the intermediate gear 31 is a second gear portion of the cam gear 30.
Keep the intermediate gear support lever 3
It is moved by the rotation of 2. The intermediate gear support lever 32 is moved around the support shaft 110 in the direction of arrow E in FIG. 1 by a normal-reverse switching device described later when the reproduction lever 24 is pressed in the direction of arrow B in FIG. The rotation is controlled in any direction of arrow E '.

In addition, since a friction member is interposed between the first gear portion 30a and the second gear portion 30c of the cam gear 30, the rotation of a portion which is engaged with the second gear portion 30c and rotates. When the resistance is small, the second gear 30c is driven by the drive motor 17c.
However, when the rotation resistance of a portion that is rotated by meshing with the second gear portion 30c is large, the second gear portion 30c is not rotated even when the drive motor 17 rotates.

Further, first and second reel base gears 33, 34 are mounted on the lower surface of the chassis substrate 5 coaxially with the first and second reel bases 6, 7, respectively. The second reel base gear 34 attached to the second reel base 7 includes:
The reversing gear 35 is engaged. When the reproducing lever 24 is pressed in the forward direction in the direction of arrow B in FIG. 1, the intermediate gear 31 is inverted with the first reel base gear 33 by the rotation of the intermediate gear supporting lever 32. The first reel base gear 33 and one of the reversing gear 35 are selectively meshed with each other. That is, when the drive motor 17 rotates, one of the upper first and second reel bases 6 and 7 is rotationally driven in a predetermined direction, and the reel hub engaged with the reel bases 6 and 7 is rotated. The magnetic tape 3 is rotated by rotating
Is wound in either the normal direction or the reverse direction.

Further, a fast-forward idle gear 36 is rotatably attached to a bent front end of the fast-forward lever 26 via a support shaft 36a erected at the front end. When the fast-forward lever 26 is pressed in the direction of arrow B in FIG. 1 and moved to the forward position, the fast-forward idle gear 36 is moved to the first gear portion 30 of the reversing gear 35 and the cam gear 30.
meshes with a at the same time. That is, when the fast-forward button 15 is pressed in the direction of arrow B in FIG. 1 to rotate the drive motor 17, the rotation of the first gear portion 30a of the cam gear 30 is performed via the fast-forward idle gear 36. The above reversing gear
35, and the other reel base 7 is rotationally driven at high speed.

Similarly, a rewind idle gear 37 is rotatably attached to the bent end of the rewind lever 27 via a support shaft 37a erected at the end.
When the rewind lever 27 is pressed in the direction of arrow B in FIG. 1 and moved to the forward position, the idle gear 37 for rewinding moves to the first reel base gear 33 and the cam gear 30.
At the same time with the first gear portion 30a. That is, the rewind button 16 is pressed in the direction of arrow B in FIG.
When the drive motor 17 rotates, the rotation of the first gear portion 30a of the cam gear 30 is transmitted to the first reel base gear 33 via the rewind idle gear 37, and the first reel base 6 is driven at a high speed. Is driven to rotate.

(G-2) Description of Normal-Reverse Switching Device (First)
Next, a normal-reverse switching device will be described with reference to FIGS. 1, 3, and 4. FIG.

As shown in FIG. 3, a limiter spring 38, which constitutes a first urging means, is provided at an end of the reproducing lever 24, which is located inside the chassis substrate 5 and is bent in an L-shape. The transmission lever 39 is connected. This transmission lever 39
Is pivotally supported by a support shaft 39a erected on the lower surface of the chassis substrate 5, and is mounted so as to be rotatable about the support shaft 39a. A spring engaging piece 39b of the limiter spring 38 is formed at one end of the transmission lever 39, and one end of a magnetic head moving lever 40 which is a recording and / or reproducing head moving lever described later is formed at the other end. Engagement recess 40 formed on one side
An engagement portion 39c that engages with b is formed. The transmission lever 39 is connected to the regeneration lever 24 by extending a limiter spring 38 between the spring engagement piece 39b and the spring engagement piece 24b formed at the tip of the reproduction lever 24. Since the limiter spring 38 uses a spring that generates a biasing force in the pulling direction, the regeneration lever 24 is moved to the first position.
When the lever is pressed in the direction of arrow B in the drawing and moved to the forward movement position, the transmission lever 39 receives the urging force of the limiter spring 38 and moves in the forward movement direction of the reproduction lever 24 about the support shaft 39a. Following this, it is rotated counterclockwise in the direction of arrow F in FIG. After the transmission lever 39 is rotated to a predetermined position and positioned as described later, the limiter spring 38 further applies a pressing operation force to the reproduction lever 24 in the forward movement direction in the direction of arrow B in FIG. When applied, the transmission lever 39 is stretched to prevent an excessive force from being applied to the transmission lever 39. Such a transmission lever 39
With the rotation of the transmission lever 39, the engaging portion 39c formed at the other end of the transmission lever 39 also rotates counterclockwise in the direction of arrow F in FIG. 3 to move the magnetic head moving lever 40 in FIG. It is moved in the direction of the middle arrow G.

Incidentally, the magnetic head moving lever 40 is provided on the lower surface side of the chassis substrate 5 in the same direction as the reciprocating directions of the above-described reproducing lever 24, stop lever 25, fast-forward lever 26 and rewind lever 27 in FIGS. 3 is attached so as to be reciprocally movable in the directions of arrows G and G 'in FIG.
Is reciprocated in the directions indicated by the arrows G and G '. The other end of the magnetic head moving lever 40 has a magnetic head engaging claw as shown in FIGS.
40a is provided. The magnetic head engaging claw 40a engages with the magnetic head 12 rotatably supported as described later. That is, when the reproducing lever 24 is moved in the forward direction in the direction of arrow B in FIG. 3, the magnetic head 12 is moved inward of the tape cassette 4 so that the magnetic head 12 comes into contact with the magnetic tape 3 and the reproducing mode is changed. Is made.

Further, a pinch roller moving lever 41 is rotatably attached to the magnetic head moving lever 40 via a support shaft 41a erected on the moving lever 40. The pinch roller moving lever 41 is provided with first and second pinch roller engaging claws 42, 43 and second and second contact arm portions 44, 45 on both sides of the support shaft 41a. I have. In the reproduction mode, the pinch roller moving lever 41 rotates in either the direction of arrow H or the direction of arrow H ′ in FIG.
2, 43 of the first or second pinch rollers 10, 11 supported so as to be able to freely contact and separate from the first or second captan shafts 8, 9 as described later. The corresponding side is moved so as to contact the first and second capstan shafts 8,9. The first and second ground rollers 10,1
1 and between the first and second capstan shafts 8,9,
The magnetic tape 3 extends, and the first or second magnetic tape 3
The magnetic tape 3 is pinched by contacting one of the pinch rollers 10, 11 with the corresponding first or second capstan 8, 9, and the first or second pinch roller 1
The magnetic tape 3 is fed in accordance with the rotation direction of the first or second capstan shafts 8, 9 with which 0, 11 abuts.

The rotation direction of the pinch roller moving lever 41 is controlled by a switching lever 46. As shown in FIG. 3, the switching lever 46 has slide guide holes 146a and 146b having a longer diameter in the longitudinal direction of the switching lever 46 in a pair of slide guide pins 112 and 113 erected on the lower surface side of the chassis substrate 5. By being inserted and supported, they are guided by the pair of slide guide pins 112 and 113 so as to be reciprocally movable in the directions of arrows I and I 'in FIG. The switching lever 46 has first and second contact projections 47, 4 which contact the first and second contact arms 44, 45 of the pinch roller moving lever 41, respectively.
8 are provided. That is, in the playback mode,
When the switching lever 46 is moving to one side in the direction of arrow I in FIG. 3, the first contact arm 44 on one side and the first contact protrusion 47 on one side are relatively positioned. The pinch roller moving lever 41 is rotated clockwise in the direction of the arrow H in FIG. 3 around the support shaft 41a in contact therewith, so that the second pinch roller engaging claw 43 causes the second pinch roller 11 to rotate. Is moved in the direction in which it contacts the second capstan shaft 9 on the other side. When the switching lever 46 is moved to the other side in the direction of arrow I 'as shown in FIG. 4, the second contact arm 45 on the other side and the second contact arm on the other side are moved. When the pinch roller moving lever 41 is rotated counterclockwise in the direction of arrow H 'in FIG. 4 by the relative contact of the contact protrusion 48, the first pinch roller engaging claw 42 causes the first pinch to move. The roller 10 is moved in a direction in which it contacts the first capstan shaft 8 on one side.

Further, the first and second pinch roller moving levers 41
The first and second ends of the contact arms 44 and 45 are
Engaging claw portions 44a, 45a are provided. These engaging claws 4
4a and 45a indicate that the magnetic head moving lever 40 is moved in the direction of arrow G in FIGS. 3 and 4 by pressing the reproducing lever 24 in the forward direction in the direction of arrow B in FIGS. 3 and 4. In this state, the first and second arm portions projecting from both sides of an intermediate gear moving lever 49 pivotally supported and rotatably supported by a support shaft 20b set on the lower surface of the chassis substrate 5, respectively.
The ends 50 and 51 are in contact with each other. The intermediate gear moving lever 49 is connected to the first and second engaging claw portions 44a, 45a.
Due to the contact between a and the first and second arms 50 and 51, the arm is rotated following the rotation of the pinch roller moving lever 41. At one end of the intermediate gear moving lever 49, an engaging arm 52 that engages with the intermediate gear supporting lever 32 is provided. That is, the intermediate gear moving lever 49 is supported by the support shaft 20b.
3 and 4, the intermediate gear support lever 32 follows, and the support shaft 110 is centered on the support shaft 110 in the direction of arrow E in FIGS. 3 and 4. Or E '
The intermediate gear 31 attached to the tip of the intermediate gear support lever 32 is operated to move in either direction in which the reverse gear 35 or the reel base gear 33 mesh.

When the reproducing lever 24 is pressed in the forward direction in the direction of arrow B in FIGS. 3 and 4, the reproducing lever 24 moves the magnetic head moving lever 40 in the direction of arrow G in FIG. After positioning is restricted by upward movement,
Furthermore, it is slightly moved in the forward movement direction and locked. When the magnetic head moving lever 40 is positioned and locked, the moving operation of the transmission lever 39 is also stopped, so that the forward movement when the reproducing lever 24 is pressed in the direction of arrow B in FIGS. 3 and 4 is performed. When locked at the position, the limiter spring 38 is in a slightly stretched state and urges the magnetic head moving lever 40 in a direction to further move the magnetic head moving lever 40 upward in the direction of arrow G in FIG. The positioning of the magnetic head moving lever 40 is performed by the pinch roller by the intermediate gear moving lever 49 whose rotation is regulated in conjunction with the intermediate gear 31 meshed with a predetermined gear, and the switching lever 46. This is performed through regulating the movement of the moving lever 41. Therefore, the urging force of the limiter spring 38 applied to the magnetic head moving lever 40 is transmitted to the intermediate gear moving lever 49 and the switching lever 46 via the pinch roller moving lever 41. The urging force transmitted to the intermediate gear moving lever 49 is transmitted through the intermediate gear support lever 32 to the intermediate gear
It has been transmitted to 31. That is, if the intermediate gear 31 is to be separated from the first reel base gear 33 or the reversing gear 35 with which the gear 31 is engaged, the magnetic head moving lever 40 resists the urging force of the limiter spring 38. The intermediate gear 31 is prevented from separating from the first reel base gear 33 or the reversing gear 35 with which the intermediate gear 31 is meshed by the biasing force of the limiter spring 38. I have.

Note that the intermediate gear moving lever 49 is provided with a rotation restricting claw 49a that is engaged with a sector hole 40c provided in the magnetic head moving lever 40. In the regeneration mode, the intermediate gear moving lever 49 is provided with the rotation restricting claw 49a engaged with the enlarged diameter portion of the fan-shaped hole 40c. It is rotatable in the J 'direction. Accordingly, the intermediate gear support lever 32, the other end of which is engaged with the engaging arm 52 of the intermediate gear moving lever 49, is also rotated following the rotation of the intermediate gear moving lever 49, and this intermediate gear movement is performed. The intermediate gear 31 attached to one end of the lever 49 is rotated so as to mesh with either the one reel base gear 33 or the reversing gear 35.

In a mode other than the reproducing mode, that is, when the reproducing lever 24 is moved in the backward direction in the direction of arrow B 'in FIGS. 1 and 3, the magnetic head moving lever 40 is moved to the second position. When it is moved in the direction of arrow G 'in FIGS. 1 and 3 and returned to the return position, the rotation restricting claw 49a is engaged with the reduced diameter portion of the fan-shaped hole 40c,
The rotation of the intermediate gear moving lever 49 is restricted, and the rotation of the intermediate gear supporting lever 32 connected to the intermediate gear moving lever 49 is also restricted. The intermediate gear mounted on one end of the intermediate gear supporting lever 32 31 is the first reel base gear
It is in a state where it does not mesh with any of the reversing gear 35 and the reversing gear 35.

The position of the switching lever 46 is controlled by the rotational position of the switching toothless gear 53. The switching toothless gear 53 is rotatably mounted at a position meshing with the first gear portion 30a of the cam gear 30 via a support shaft 53a erected on the chassis substrate 5 and separated by 180 °. A pair of first and second missing tooth portions 53n over a predetermined angle range
53r is provided. Further, the switching toothless gear 53 is provided with an eccentric cam portion 54 that abuts and engages in an engagement recess 46a formed by cutting out one side of one end of the switching lever 46. When the switching toothless gear 53 is in the normal position, that is, as shown in FIG.
When the switching toothless gear 53 and the cam gear 30 do not mesh with each other, the eccentric cam portion 54 engages with the engagement concave portion 46 when the switching toothless gear 53 and the cam gear 30 do not mesh with each other.
a of the switch lever 46 in contact with one of the rising inner side surfaces 46b located on the right side in FIG.
Is positioned at a first position (normal position) on one side moved in the direction. As shown in FIG. 4, when the switching toothless gear 53 is in the reverse position, that is, the second toothless part 53r faces the first gear part 30a of the cam gear 30, and Switching missing tooth 53 and cam gear 30
Are not engaged, the eccentric cam portion 54 abuts on the other rising inner side surface 46c on the other side of the engaging concave portion 46a, which is located on the left side in FIG. 4, to change the position of the switching lever 46. The position is set to the second position (reverse position) on the other side moved in the direction of arrow I 'in FIG.

That is, when the switching toothless gear 53 is positioned at the normal position or the reverse position, the switching lever 46 is also positioned at the first position as the normal position or the second position as the reverse position. The roller moving lever 41 is selectively rotated in the direction of the arrow or H 'in FIGS.
Second or first pinch rollers 11,
Reproduction or recording is performed in the normal direction or the reverse direction where 10 is pressed.

On one main surface of the switching toothless gear 53, 18
A pair of first pairs provided at two locations separated by an angle of 0 °
And second positioning projections 55n and 55r are formed, and the first or second positioning projections 55n and 55r are selectively brought into contact with the trigger lever 56, and the first or second positioning projections are described below by a trigger mechanism. The projections 55n and 55r are biased in a direction of pressing the trigger lever 56 to be positioned at the normal position or the reverse position.

(G-3) Description of trigger mechanism (FIGS. 1, 5 to 8)
Next, the trigger mechanism will be described with reference to FIGS. 1 and 5 to 8. FIG.

A trigger lever 56 constituting the trigger mechanism is formed in a substantially L-shape as shown in FIGS. 1 and 5, and has a pair of slide guide shafts 11 erected on the lower surface of the chassis 5 substrate.
4, 115, a slide guide hole 1 protruding from the main body 56a of the trigger lever 56 and having a major axis in the longitudinal direction of the main body 56a.
16 and 117 are engaged, and the slide guide holes 116 and 117 are guided by the slide guide shafts 114 and 115 so as to return in the direction of arrow L 'in FIGS. 1 and 5 and in the direction of arrow L in FIGS. 1 and 5. Mounted movably in the forward direction. The trigger lever 56 is urged by a first leaf spring 57 attached to the chassis substrate 5 in the backward direction in the direction of arrow L 'in FIG. And the above trigger lever
Reference numeral 56 denotes a bent portion 56d that protrudes substantially vertically at one end of the main portion 56a.
The contact edge 56c provided at the tip of the switching toothless gear 5
The third positioning projection 55n, 55r is in contact with and engaged with either of them.

The trigger lever 56 includes a switching operation lever 61 mounted on the chassis substrate 5 in parallel with the reproduction lever 24, the stop lever 25, the fast-forward lever 26, and the rewind lever 27, and a switching operation lever 61 of the switching operation lever 61. The trigger transmission lever 63, which is rotated by the pressing operation, is moved in the reciprocating directions indicated by arrows L 'and L in FIG. The trigger lever 56 is provided with a switching operation lever 61
Is pressed and slid in the forward direction in the direction of arrow L in FIG. 5, the contact edge 56d is positioned at the outer peripheral side of the rotation locus of the first and second positioning projections 55n and 55r. I do.

When the switching toothless gear 53 is in the normal position or the reverse position, the first or second positioning projection 55n, 55r pushes the contact edge 56c of the trigger lever 56 in FIG. It is urged to rotate clockwise in the direction of the middle arrow C. That is, when the switching toothless gear 53 is in the normal position or the reverse position, as shown in FIGS. 3 and 4, the engagement between the contact portion 53b at the tip of the eccentric cam portion 54 and the switching lever 46 is performed. A line connecting a position at which the rising inner surface 46b on one side of the recess 46a or the rising inner surface 46c on the other side is in contact with the center of the support shaft 53a that is the center of rotation of the switching toothless gear 53, The direction of reciprocation of the switching lever 46 is not parallel to the direction of reciprocation.
The switching lever 46 is oriented in the direction toward the neutral position by a torsion spring 59 constituting a second urging means attached to the chassis 5. Therefore, the switching toothless gear 53 is constantly biased by the switching lever 46 in the direction of arrow C in FIG.

In the reproduction mode, the switching lever 46 does not see only the urging force of the torsion spring 59, but also the urging force of the limiter spring 38 and the first or second pinch rollers 10, 11.
Corresponding to the first or second capstan shafts 8, 9 respectively.
It is urged in the direction of the neutral position by urging means, which will be described later, which is urged in the direction of separating from the neutral position. That is, as described above, when the regeneration lever 24 is moved forward and locked, the switching lever 46 is actuated by the intermediate gear moving lever.
By cooperating with 49, the rotation of the pinch roller moving lever 41 is regulated, thereby positioning the magnetic head moving lever 40 at the moving position moved in the direction of arrow G in FIG. The biasing force of the limiter spring 38 applied to the magnetic head moving lever 40 is transmitted to the switching lever 46 via the pinch roller moving lever 41. The portions of the first and second contact arms 44, 45 of the pinch roller moving lever 41 that the first and second contact protrusions 47, 48 of the switching lever 46 contact correspond respectively. Since the inclined surfaces 44b and 45b are provided, the biasing force of the limiter spring 38 biases the switching lever 46 in a direction toward the neutral position. Further, the pinch roller moving lever 41 is rotated by a biasing force in a direction of separating the first and second pinch rollers 10 and 11 from the corresponding first and second capstan shafts 8 and 9, respectively. It is biased in the direction of the position. This biasing force is applied to the limiter spring 38.
Similarly, the switching lever 46 is urged toward the neutral position.

When the switching toothless gear 53 is in the normal position or the reverse position, it is urged to rotate as described above, so that the trigger lever 56 slides in the forward direction in the direction of arrow L in FIG. When it is done, it is slightly rotated. Then, the first and second toothless portions 53n, 53n of the switching toothless gear 53
53r moves from a position facing the first gear portion 30a of the cam gear 30, and the switching toothless gear 53 and the first gear portion 30a
Meshes. When this meshing is performed, the first gear portion
Since 30a is rotationally driven by the drive motor 17, the switching toothless gear 53 is rotationally driven in the direction of arrow C in FIG. 5, and the first and second positioning projections 55n and 55r are rotated by 180 ° at a position rotated by 180 °. The position is determined by the contact of any one with the contact edge 56c of the trigger lever 56. As described above, when the switching toothless gear 53 is rotated by 180 °, the eccentric cam portion 54 moves the switching lever 46 from the first position in the direction of arrow I in FIG. The second position moved in the direction of the middle arrow I ', or the fourth position
By moving from the second position moved in the direction of the arrow I 'in the drawing to the first position moved in the direction of the arrow I in FIG. 3, the normal position and the reverse position in the reproducing or recording operation mode are switched. Is switched.

A switching operation lever 61 for operating the trigger lever 56 in the forward direction in the direction of arrow L in FIG. 5 includes a pair of slide guide shafts 118, 119 erected on the chassis substrate 5, and the longitudinal direction of the operation lever 61 is defined as a major axis. Slide guide hole 120,
The engaging member 121 is engaged with the chassis substrate 5 so as to be reciprocally movable in the directions indicated by arrows M and M 'in FIG. Further, the trigger lever 61 is urged to move in the backward direction in the direction of arrow M 'in FIG. 5 by a second leaf spring 60 attached to the chassis substrate 5. That is,
The trigger lever 61 receives the urging force of the leaf spring 60 by engaging the distal end of the leaf spring 60 with an engaging portion 61b protruding from one end of the trigger lever 61, as shown in FIG. It is urged to move in the backward direction in the direction of arrow M '. Further, a switching button 58 is attached to one end of the trigger lever 61.

The switching transmission lever 6 is provided on the trigger lever 61 via a support shaft 62a erected on the trigger lever 61.
2 is rotatably mounted. As shown in FIG. 6 (A), when the trigger lever 61 is pressed, the switching transmission lever 62 is rotatably mounted via a support shaft 122 implanted on the chassis substrate 5. The trigger transmission lever 63 abuts and engages. The other end of the trigger transmission lever 63 is biased by the first leaf spring 57 attached to the chassis substrate 5 in the backward movement direction of the arrow l 'in FIG. Locking piece 56 protruding on one side
A contact engagement piece 63a formed on one end side is opposed to d. The trigger transmission lever 63 is provided with the contact engagement piece 63a.
5 comes into contact with and engages with a locking pin 63c planted so as to face the locking piece 56d, whereby rotation in the direction indicated by the arrow N in FIG. 5 is regulated and positioning is performed. As described above, the trigger transmission lever 63 in which the engagement piece 63a is opposed to the engagement piece 56d of the trigger lever 56, the trigger lever 61 is set to M in FIG.
5 is rotated in the direction of arrow N in FIG. 5 via the switching transmission lever 62. And
The trigger transmission lever 63 moves the trigger lever 56 in the direction of arrow L 'in FIG. The switching transmission lever 62
The lever contact engagement portion 62b formed at one end portion is formed at one end portion of the trigger transmission lever 63 toward the arrow M direction in FIG. 5 which is the forward movement direction of the switching operation lever 61. It is opposed to the joint 63b. Further, the switching transmission lever 62 includes a rotation restricting piece 62c formed at the other end.
Is a locking projection provided on a part of the switching operation lever 61.
The rotation in the direction indicated by the arrow O in FIG. 5 is restricted.

When the switching operation lever 61 is pressed in the forward direction in the direction of the arrow M in FIG. 5, the lever contact engaging portion 62b formed at one end of the switching transmission lever 62 is moved to one end of the trigger transmission lever 63. 6 (A) and 6 (B), the abutting engagement portion 63b formed in FIG. Rotate in the direction. At this time, the switching transmission lever 62 is
6 (A) and 6 (B) when the rotation restricting piece 62c formed at the other end abuts on and engages with a locking projection 61a provided on a part of the switching operation lever 61. The rotation in the direction indicated by the opposite arrow O is restricted.

By rotating the trigger transmission lever 63 in this way, the contact engagement piece 63a formed on one end side of the trigger transmission lever 63 is brought into contact with the locking piece 56d protruding on one side of the other end. And press the contact engagement piece 63a to operate the trigger lever 5
6 is moved in the forward direction in the direction of arrow L in FIG. 6 (B). By moving the trigger lever 56 in the forward direction in the direction of arrow L in FIG. 6 (B), the switching between the normal direction and the reverse direction of the reproduction or the reproduction is performed as described above.

Then, the switching operation lever 61 is moved to the position shown in FIG.
When the slide operation is further performed in the forward direction in the direction of arrow M in FIG. 6 (B), the trigger transmission lever 63 is turned on in FIG. 6 (B).
As shown in FIG. 7 (A), the operation lever is further rotated in the direction of the middle arrow N, and the contact engagement portion 63b at the other end of the trigger transmission lever 63 and the lever contact at one end of the switching transmission lever 62 are used. The relative engagement with the contact engaging portion 62b is released, and the lever contact engaging portion 62b of the switching transmission lever 62 passes through the contact engaging portion 63b of the trigger transmission lever 63 and is separated. As a result, the pressing operation of the trigger transmission lever 63 by the switching transmission lever 62 is released, and the trigger lever 56 receives the urging force of the first leaf spring 57 in the direction of the arrow L 'in FIG. It is moved in the backward direction and returns to the initial position shown in FIG. Further, as shown in FIG. 7 (A), the trigger transmission lever 63 is moved up to a position where the contact engagement piece 63a comes into contact with the locking piece 56d of the trigger lever 56 which has returned to the initial position. The rotation operation is performed in the return direction indicated by the arrow N '.

The switching operation lever 61 is connected to the second leaf spring.
When it is moved in the backward direction in the direction of the arrow M 'in FIG. 7 (A) under the urging force of 60, as shown in FIG. 7 (B), the switching transmission lever 62 engages with the lever. The portion 62b abuts and engages with the abutment engagement portion 63b of the trigger transmission lever 63 from below in the figure. At this time, as shown in FIG.
The trigger transmission lever 63 returns to the initial position and is positioned by the locking pin 63c. The switching transmission lever 62 is moved in the direction opposite to the arrow O in FIGS. 7B and 8 so that the lever contact engagement portion 62c is separated from the locking projection 61a by the contact engagement portion 63b. Is rotated. When the switching operation lever 61 returns to the initial position shown in FIG. 5, the switching transmission lever 62 has a return protrusion 64 provided on the chassis substrate 5 with a rotation restricting piece 62c at the other end. 8, it is turned in the direction of arrow O in FIG. 8 to forcibly return to the initial state shown in FIG. That is, when the switching transmission lever 61 has returned to the initial position, the rotation restricting piece 62c of the switching transmission lever 62, as shown in FIG.
4 and the locking projection 61a.

(G-4) Description of Tape End Detection Mechanism (FIG. 1, FIG. 9)
Next, a tape end detecting mechanism will be described with reference to FIGS. 1, 9, and 11. FIG.

This tape end detection mechanism, as shown in FIG.
One end is engaged with a cam groove 71 formed on one main surface 30b side of the cam gear 30 that rotates at all times, and the other end is the trigger lever described above.
A detection lever 65 is provided so as to be engageable with 56.

The detection lever 65 is integrally formed of a synthetic resin, and as shown in FIG.
The lever body 69 has a lever body 69, and a tip portion 68 of the lever body 69 is provided with a protruding projection 68a that engages with the cam groove 71, and the other end facing the side on which the copying projection 68a protrudes. A trigger lever pressing portion 70 is provided on the side. In the opening 65a of the lever main body 69, a bending arm 67 is provided which is extendable and contractible in the extension direction in which a cylindrical pivot support 66 is formed at the distal end with the distal end 68 being a connecting portion. This bent arm
67 has a spring property by being formed continuously with a slightly thin curved portion so that it can be extended and contracted in the extension direction.
The detection lever 65 is formed such that the scanning protrusion 68a, the shaft pivot 66, and the trigger lever pressing portion 70 are substantially linear.

The detection lever 65 has a shaft pivot 66 formed at the tip of the bent arm 67 supported by the gear shaft 33a of the first reel base gear 33 via a friction member such as a coil spring. The copying protrusion 68a is engaged with a cam groove 71 formed in the cam gear 30, and is rotatably mounted on the gear shaft 33a. In the detection lever 65 attached in this way, the cam gear 30 rotates, and the engagement position of the copying protrusion 68a with the cam groove 71 is changed, so that the bent arm portion 67 expands and contracts. Then, the trigger lever pressing portion 70 is moved forward and backward in accordance with the expansion and contraction of the bent arm portion 67.

By the way, in the cam groove 71 which is engraved on one main surface 30b of the cam gear 30 and engages the copying protrusion 68a of the detection lever 65,
An outer peripheral cam surface 71a and an inner peripheral cam surface 71b are formed. In particular, the outer peripheral cam surface 72a and the inner peripheral cam surface 7
Centering portion 71c and the distance r ₁ and so as to form equal to the diameter r ₂ of the copying protrusions 68a between 1b are formed. In the cam groove 71, a position on the same rotation locus as the centering portion 71c and the centering portion 71c
A trigger claw 72 is provided at a position separated from the outer peripheral cam surface 71a and the inner peripheral cam surface 71b by a predetermined angle.

By the way, in the reproduction mode, the tape cassette 4
Is mounted, and if the magnetic tape 3 in the tape cassette 4 is operated for traveling, the first reel base 6 is operated to rotate in either direction. At this time, the detection lever 65 is rotationally biased by the shaft pivot portion 66 being rotationally biased by the one reel base gear 33 via the friction member. For example, when reproduction or recording in the normal direction is being performed, the detection lever 65 is rotationally biased so that the copying protrusion 68a is directed toward the outer peripheral direction of the cam gear 30, and reproduction or recording in the reverse direction is performed. When the detection lever 65 is turned, the detection lever 65 is rotationally biased so that the copying protrusion 68a is directed toward the inner peripheral side of the cam gear 30.

In the reproduction mode, since the cam gear 30 is driven to rotate in the direction of arrow Q in FIG. 9 by the drive motor 17, the copying protrusion 68a is moved according to the shape of the cam groove 71. For example, when reproduction or recording in the normal direction is being performed, the copying projection 68a is guided and moved by the outer peripheral cam surface 71a of the cam groove 71, and when reproduction or reproduction in the reverse direction is being performed, The copying protrusion 68a is guided and moved by the inner peripheral cam surface 71b of the cam groove 71. That is, when the magnetic tape 3 is running, the first reel base 6 rotates,
In addition, the scanning projection 68a is driven by the rotation of the drive motor 17.
Moves along the outer peripheral cam surface 71a or the inner peripheral cam surface 71b of the cam groove 71, so that the copying protrusion 68a is formed on the outer peripheral cam surface 71a or the inner peripheral cam surface 71b even after passing through the centering portion 71c. It is guided by any one of them, and does not come into contact with the trigger claw 72.

Then, in the reproduction mode, when the magnetic tape 3 is wound up to the end, the rotation of the first reel base 6 is stopped, and the rotation of the first reel base gear 33 is also stopped. By the rotation stop of the reel base gear 33, the rotation bias on the detection lever 65 is not performed. At this time,
Since the rotation of the second reel base 7 also stops, the rotation of the second reel base gear 34 and the reversing gear 35 also stops. The rotation of the intermediate gear 31 meshing with either the first reel base gear 33 or the reversing gear 35 is also stopped, and the rotation of the second gear portion 30c of the cam gear 30 is also stopped. Since the second gear portion 30c is attached to the cam gear 30 via a friction member, the first gear portion 30a and the cam gear 30 continue to rotate.

When the scanning projection 68a of the detection lever 65 reaches the centering portion 71c in the cam groove 71 by the rotation of the cam gear 30 and is moved to a position on the movement locus of the trigger claw 72, the reel base relative to the detection lever 65 Since the rotation urging by the gear 33 is not performed, the copying protrusion 68a remains at the position on the movement locus of the trigger claw 72. That is, the detection lever 65 is stopped at a predetermined position as shown in FIG. Here, the cam gear 30 is further moved by an arrow Q in FIG.
When rotated in the direction shown in FIG.
The trigger claw 72 provided therein abuts and engages with the copying protrusion 68a. Then, the cam gear 30 is further driven to rotate, thereby urging the bent arm portion 67 in the direction of compressing in the direction of arrow R in FIG. The copying protrusion 68a pressed by the trigger claw 72 is operated to move in a direction approaching the shaft pivot 66 by the compression of the bending arm 67. The pressing operation of the copying protrusion 68a causes the bending arm 67
Is compressed in the direction of arrow R in FIG. 10, and the lever body 69 is also moved in the same direction relative to the shaft pivot 66. When the lever body 69 is moved in the direction of arrow R in FIG. 10, a trigger lever provided on the other end of the lever body 69 which is opposed to a pressed claw 56b provided on the trigger lever 56 is pressed. The unit 70 presses the pressed claw 56b, moves the trigger lever 56 in the same direction as the arrow L in FIG. 10, and switches between the normal direction and the reverse direction of reproduction or recording as described above. Will be

Note that the copying protrusion 68a of the detection lever 71 is
During the movement operation guided by the inner peripheral cam surface 71b, the centering portion 71c is formed by the first protrusion 71d of the inner peripheral cam surface 71b before reaching the centering portion 71c in the cam groove 71. Is guided so as to move toward the outer peripheral side from the position. Therefore, when the copying protrusion 68a reaches the centering portion 71c in any of the normal direction and the reverse direction in the reproduction or recording mode, the copying protrusion 68a is formed from the outer peripheral side of the centering portion 71c.
That is, it is guided by the outer peripheral cam surface 71a of the cam groove 71 and reaches the centering portion 71c. Therefore, regardless of whether the direction of the reproduction or recording mode is the normal direction or the reverse direction, it is not affected by so-called backlash or the like which is a reaction force of the rotational urging force by the friction member provided on the shaft pivot 66. In addition, accurate positioning of the copying protrusion 68a is performed. Further, after passing through the centering portion 71c, the copying protrusion 68a is guided by the second protrusion 71e of the outer peripheral side cam surface 71a, and is moved and guided to the slightly inner peripheral side of the cam groove 71. The position of the claw 72 is corrected so as to be located on the movement locus.

Further, in the fast-forward mode or the rewind mode, in order to prevent the copying protrusion 68a of the detection lever 65 from coming into contact with the trigger claw 72 of the cam gear 30, the movement is performed in conjunction with the movement of the magnetic head moving lever 40. A detection lever moving operation member 73 is provided. The detection lever moving operation member 73 is formed by a torsion coil spring, pivotally supports the center coil portion 73 a on a support shaft 125 erected on the chassis substrate 5, and is attached to be rotatable about the support shaft 125. I have. This detection lever moving operation member 73 is provided with one arm portion.
73b is engaged with one side of the magnetic head moving lever 40, and in the fast forward mode and the rewind mode, the other arm portion is used.
73c is brought into contact with one side of the detection lever 65, and the detection lever 65 is urged to rotate in a direction in which the copying protrusion 68a in the direction of arrow S in FIG. ing. When the tape recorder is set to the reproduction mode and the magnetic head moving lever 40 is moved in the direction of arrow G in FIG. 10, the detection lever moving operation member 73 is moved to the ninth position via one arm 73b. As shown in the figure, the arm 73c is rotated clockwise in the figure, and the contact engagement of the other arm portion 73c with the detection lever 65 is released, so that the detection lever 65 can be rotated.

(G-5) Description of the shut-off mechanism (FIGS. 1, 11 to
(FIG. 12) Next, the shut-off mechanism will be described with reference to FIGS. 1, 11, and 12.

The shut-off mechanism includes a shut-off lever 74 and a shut-off transmission lever 75. As shown in FIG. 11, the shut-off lever 74 switches the pressed operation portion 74b which is bent so as to be inclined with respect to the lever body 74a on one end side, and the rotation trajectory of the eccentric cam portion 54 of the toothless gear 53. And a pressing operation portion 74c formed at the tip of a bent portion bent substantially at right angles to the lever body 74a at the other end so as to face one end of the lock plate 28 described above. 5 is disposed on the lower surface side. Further, the shut-off lever 74 is provided with a support shaft 126 in which the vicinity of the base end of the bent portion on which the pressing operation portion 74c is formed is set on the lower surface of the chassis substrate 5.
And mounted so as to be rotatable about the support shaft 126. In addition, the shut-off transmission lever 75 is configured such that the pressed piece 75a that is
Of the lock plate 28
Is rotatably mounted via a support shaft 127 which is erected at one end of the. The shut-off transmission lever 75 is pressed by a tension spring 76 stretched between a spring engagement piece 76a implanted on the lock plate 28 and a spring engagement piece 76b implanted on the shut-off transmission lever 75. The piece 75a enters between the lock plate 28 and the pressing operation portion 74 of the shut-off lever 74 and is urged to rotate in the clockwise direction in the direction of arrow T in FIG. 11, which is the direction in which it comes into contact with the pressing operation portion 74c. ing.

Then, in the regeneration mode, the shut-off lever 74 is rotated by the eccentric cam portion 54 when the switching toothless gear 53 rotates from the reverse position to the normal position in the direction of arrow C in FIG. Pressed operation part 74
b is pressed and turned in the U direction in FIG. When the shut-off lever 74 is rotated in this manner, one end of the lock plate 28 is pressed by the pressing operation portion 74c on the other end via the pressed piece 75a of the shut-off transmission lever 75, and this lock plate is 28 is operated in the direction of arrow D 'in FIG.
Then, when the lock plate 28 is moved in the direction of the arrow D 'in FIG. 11, the lock plate 28 is pressed by the forward movement position to engage the claw 24a with the locking claw 28i and locked by the lock plate 28. The locked state of the reproducing lever 24 at the forward position is released, the reproducing mode is released, and the reproducing or recording operation is stopped.

The shut-off transmission lever 75 is
The rotation urging position of the tension spring 76 is regulated by the contact between the a and the lock plate 28. In addition, the shut-off transmission lever 75 has the other end facing the one end side on which the pressed piece 75a is formed and the other end of the switching operation lever 61 described above, so that the switching lever 61 is in the second position. By being pressed in the forward movement direction in the direction of arrow M in FIG. 11, it is rotated counterclockwise in the direction of arrow T in FIG. 11 against the urging force of the tension spring 76. Then, when the shut-off transmission lever 75 is pressed and rotated by the switching operation lever 61, the pressed piece 75a is separated from between the lock plate 28 and the pressing operation portion 74c of the shut-off lever 74, The pressed piece 75a by the shut-off lever 74
Is disabled, and as a result, the pressing operation of the lock plate 28 by the shut-off lever 74 is also disabled. That is, when the switching operation lever 61 is moved in the forward direction in the direction of arrow M in FIG. 11, the shut-off transmission lever 75 is rotated in the counterclockwise direction in the direction of arrow T in FIG. As a result, the switching toothless gear 53 is driven to rotate as described above, and the shut-off lever 74 is moved to the eleventh position.
No pressing operation of the lock plate 28 is performed at all even if it is rotated in the direction of arrow U in the figure.

When the shut-off transmission lever 75 is rotated as shown in FIG.
12 is opposed to the inclined surface portion of the pressing operation portion 74c formed in a substantially rectangular shape of the shut-off lever 74, so that the biasing force of the tension spring 76 causes the counterclockwise direction in the direction of arrow T in FIG. At the time of the return to the rotation, the pressing operation portion 74c of the shut-off lever 74 is pressed to rotate the shut-off lever 74 in the direction of the arrow U in FIG. 12 to return to the initial position.

(G-6) Description of Mode Switching Mechanism (FIGS. 1, 11 to)
(FIG. 12) Next, the mode switching mechanism will be described with reference to FIGS. 1, 11, and 12.

The mode switching mechanism switches between a mode in which the shut-off mechanism is activated and a mode in which the shut-off mechanism is not activated when the reproduction or recording mode is switched from the reverse direction to the normal direction.

As shown in FIGS. 11 and 12, the mode switching mechanism includes a mode switching lever 77 for rotating the shut-off transmission lever 75. The mode switching lever 77 includes a pivoted operation portion 75 that is provided with a lever rotation operation portion 77a at one end protruding from one end of a shut-off transmission lever 75.
b, and the rotating operation part 78 on the other end is
And is rotatably mounted on a support shaft 127 erected on the lower surface of the chassis substrate 5.
The mode switching lever 77 is moved to the eleventh
When the turning operation is performed in the direction of arrow V in the figure, the lever turning operation portion 77a is turned by the turning operation portion 75b of the shut-off transmission lever 75.
, The shut-off transmission lever 75 is rotated in the direction indicated by the arrow T in FIG. 11 against the urging force of the tension spring 76. When the shut-off transmission lever 75 is turned in the direction indicated by the arrow T in FIG. 11, the lock plate 28 cannot be turned by the shut-off lever 74 as shown in FIG. Is shut off.

In addition, a locking arm 77b, which is formed to be elastically deformable, protrudes from one side of the mode switching lever 77. The locking arm 77b has a tip portion selectively fitted and locked to a plurality of locking recesses 77c and 77d provided on the chassis substrate 5 as shown in FIG. 11 or FIG. The mode switching lever 77 is positioned at a predetermined position.

(G-7) Description of Support Mechanism for Magnetic Head and Pinch Roller (FIGS. 1, 13) Next, referring to FIG. 13, the magnetic head 12 and the first and second magnetic heads will be described.
The support mechanism of the pinch rollers 10, 11 will be described.

The magnetic head 12 and the first and second pinch rollers 10 and 11 are, as shown in FIG.
Is mounted on a cassette holder 79 rotatably mounted via a pivot 79a. The magnetic head 12 is rotatably supported in directions indicated by arrows W and W 'in FIG. 13 by pivotally supporting a base end of a support shaft 80a erected at one corner of the cassette holder 79. The magnetic head support arm 80 is attached to a concave head attachment portion 80b formed in the middle of the arm 80. Further, tape guides 81 and 82 are attached to the magnetic head support arm 80 so as to be located on both sides of the magnetic head 12, respectively. Note that tape guides 83 and 84 are also attached to both sides of the magnetic head 12, respectively.

The pinch rollers 10 and 11 are rotatably supported on the distal ends of first and second pinch roller support arms 85 and 86 rotatably mounted in the cassette holder 79. That is, the first pinch roller support arm 85 on which the first pinch roller 10 is supported is rotatably attached to the support shaft 80a on which the magnetic head support arm 80 is supported by supporting the base end side thereof, The second pinch roller support arm 86 on which the second pinch roller 11 is supported is provided with the support shaft.
A base end is supported by a support shaft 86a erected at the other corner of the cassette holder 79 opposite to the cassette holder 80a so as to be rotatable. Further, pinch roller pressing springs 87 and 88 made of torsion coil springs are wound around the support shaft 80a that supports the first pinch roller support arm 85 and the support shaft 86a that supports the second pinch roller support arm 86, respectively. Have been. Further, return springs 80b, 86b formed of torsion coil springs are wound around the support shafts 80a, 86a, and the first and second pinch roller support arms 85, 86 correspond to the respective pinch rollers 10, 11. It is urged to rotate in a direction away from the capstan shafts 8,9.

When the playback mode is selected in the tape recorder, as described above, the magnetic head moving lever 40 is moved.
1 is moved in the direction of arrow G in FIG. 1, and a magnetic head engaging claw 40a formed at one end of the magnetic head moving lever 40 engages with the magnetic head support arm 80 and presses from the back side, thereby causing the magnetic head to move. The support arm 80 is rotated in the direction of the arrow W in FIG. 13 to move the magnetic head 12 attached to the middle of the magnetic head support arm 80 in the direction in which the magnetic head 12 slides on the magnetic tape 3. Further, the pinch roller moving lever 41 moves while rotating in the arrow H direction or the arrow H 'direction in FIG. 3 together with the magnetic head moving lever 40. The rotation direction of the pinch roller moving lever 41 is determined depending on whether the running direction of the magnetic tape 3 is the normal direction or the reverse direction, and the running direction of the magnetic tape 3 is selected in the normal direction. When the running direction of the magnetic tape 3 is selected to be the reverse direction, the magnetic tape 3 is turned in the direction of arrow H 'in FIG. When the running direction of the magnetic tape 3 is selected to be the normal direction, the first pinch roller engaging claw 42 is connected to the second pinch roller supporting arm 86 at one end of the pinch roller pressing spring 88. The second pinch roller 11 is rotated in the direction approaching the second capstan shaft 9 by engaging the pinch roller support arm 86 from behind and engaging with the pinch roller 88a. When the running direction of the magnetic tape 3 is selected to be the reverse direction, the second pinch roller engaging claw
43 engages with one end 87a of the pinch roller pressing spring 87 on the side corresponding to the first pinch roller supporting arm 85 to press the pinch roller supporting arm 85 from the back side, and the first pinch roller 10 The rotation operation is performed in a direction approaching the first capstan shaft 8.

When each of the pinch roller support arms 85 and 86 is rotated as described above, each of the pinch roller support arms 85 and 86
The end portions 87a, 88a of the pinch roller pressing springs 87, 88 engaging with the front side of the pinch roller engaging claws 42, 43 are pressed from the rear side, so that the pinch roller support arms 85, 86 is the other end of the pinch roller pressing springs 87 and 88
Each pinch roller 1 is rotated and urged by arrows 87b and 88b in directions indicated by arrows X and X 'in FIG.
0 and 11 are urged to press against the capstan shafts 8 and 9.

Incidentally, the cassette holder 79 is a cassette holder lock lever which is attached to the chassis substrate 5 so as to be able to advance and retreat when the tape cassette 4 is rotated to the tape cassette mounting position where the tape cassette 4 is mounted on the tape cassette mounting portion.
The locked piece (not shown) is engaged with the locking piece 89a of the 89 to lock the tape cassette at the tape cassette mounting position.

As shown in FIG. 1, the cassette holder lock lever 89 for locking the cassette holder 79 at the tape cassette mounting position is mounted on the pair of slide guide shafts 127 and 128 erected on the chassis substrate 5. The slide guide holes 130 and 131 formed in the cassette holder lock lever 89 are engaged with the longitudinal direction of the 89 as a major axis, and the cassette holder lock lever 89 is attached to the chassis substrate 5 so as to be able to advance and retreat. The cassette holder lock lever 89 includes a lock lever urging spring 90 mounted on the chassis substrate 5.
The other end 90c of the cassette holder 79 is engaged with a spring locking piece 89b cut and raised on one side of the cassette holder lock lever 89, whereby the locked piece 89a is engaged with the locked piece of the cassette holder 79, and the cassette The holder 79 is always urged to slide in the direction of arrow Y in FIG. 1 to lock the holder 79 at the tape cassette mounting position. The lock lever biasing spring
As shown in FIG. 1, one end 90b of the 90 presses the lock plate 28 in the direction of arrow D in FIG.

A cassette holder release button 91 is provided at the tip of the cassette holder lock lever 89 protruding outward from the chassis substrate 5.
When the cassette holder lock lever 89 is pressed in the direction indicated by the arrow Y in FIG. 1 against the urging force of the lock lever urging spring 90, the lock piece 89 is pressed.
a is also moved in the same direction, the engagement of the cassette holder 79 from the locked piece is released, the cassette holder 79 is turned freely, and the tape holder 79 is turned outward from the tape cassette mounting position side. The tape cassette 4 can be inserted and removed.

When the reproduction lever 24, the fast-forward lever 26 or the rewind lever 27 is pressed, that is, when the reproduction mode, the fast-forward mode or the rewind mode is selected, the switch plate 29 is turned to the arrow D 'in FIG. In this case, one end 29c of the slide plate 29 is closely opposed to 89b projecting from one side of the cassette holder lock lever 89, and the cassette holder lock lever 89 in FIG. The pressing operation in the arrow Y direction is prohibited. Therefore, even if the cassette holder release button 91 is pressed, the operation of moving the cassette holder lock lever 89 in the direction of arrow Y in FIG. 1 is prohibited, and the cassette holder 79 is rotated to the position where the tape cassette is mounted. Is kept locked.

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 appropriately modified. For example, the shape and structure of each lever shown in the above-described embodiment are not limited to the above-described embodiment, and various shapes and structures can be applied. Further, each gear in the above embodiment can be changed to an idler or the like made of rubber or the like.

Further, the present invention is not limited to an auto-reverse type tape recorder using a standard-size tape cassette, but is applicable to various auto-reverse type recording and / or reproducing apparatuses.

H. Effects of the Invention As described above, the tape recorder according to the present invention, together with the urging force of the second urging means for urging the pinch roller moving lever in the direction of the center position, moves the recording and / or reproducing head moving lever together with the urging force. The switching lever is biased toward the center position via a pinch roller moving lever whose rotation is restricted by the biasing force of the first biasing means. Since the urging means is urged in the direction of the center position by using the urging force of the urging means, it is surely moved to the center position by a large urging force, so that the switching can be reliably performed.

And a first lever for urging the switching lever toward the center position.
And the second biasing means biases the recording and / or reproducing head moving lever and biases the pinch roller moving lever, and it is necessary to provide independent biasing means for biasing the switching lever. Therefore, the number of parts can be reduced, the configuration can be simplified, and the tape recorder can be further reduced in size.

[Brief description of the drawings]

FIG. 1 is a plan view showing the entire configuration of the lower surface of the chassis substrate of the tape recorder to which the present invention is applied, and FIG. 2 is a plan view showing the entire configuration of the upper surface of the chassis substrate of the tape recorder. FIG. 3 is a plan view showing the configuration of the normal-reverse switching mechanism of the tape recorder in a normal state, and FIG. 4 is a plan view showing the configuration of the normal-reverse switching mechanism of the tape recorder in a reverse state. FIG. 5 is a plan view showing a configuration of a trigger mechanism of the tape recorder. FIG. 6A is a plan view showing a start state of a trigger operation of a main part of the trigger mechanism, and FIG. 7) is a plan view showing a state in which the main part of the trigger mechanism is in the middle of the trigger operation, and FIG. 7 (A) is a plan view showing a completed state of the main part of the trigger mechanism in the trigger operation.
FIG. 8B is a plan view showing a state where the main part of the trigger mechanism is in the middle of a return operation, and FIG. 8 is a plan view showing a state where the return operation of the main part of the trigger mechanism is completed. FIG. 9 is a partially cutaway plan view showing the configuration of the tape end detection mechanism of the tape recorder, and FIG. 10 is a partially cutaway view of the state in which the tape end of the tape end detection mechanism is detected. FIG. FIG. 11 is a plan view showing a configuration of a shut-off mechanism and a mode switching mechanism of the tape recorder, and FIG. 12 is a plan view showing a state in which a mode of the mode switching mechanism is switched. FIG. 13 is a perspective view showing the configuration of a support mechanism for a magnetic head and a pinch roller of the tape recorder. 4 Tape cassette 5 Chassis substrate 6 1st reel stand 7 2nd reel stand 8 1st capstan 9 2nd capstan 10 1st pinch roller 11 second pinch roller 12 magnetic head 17 drive motor 24 playback lever 28 lock plate 29 switch plate 30 cam gear 31 intermediate gear 33 first reel base Gear 35 Reversing gear 38 Limiter spring 40 Magnetic head moving lever 41 Pinch roller moving lever 46 Switching lever 49 Intermediate gear moving lever 53 Switching toothless gear 56 Trigger lever 62 … Switching transmission lever 65… Detection lever 68a… Following projection 67… Bending arm 70… Trigger lever pressing part 71… Cam groove 74… Shut-off lever 75… Shut-off transmission lever 79… Cassette holder 89 …… Cassette hol Lock lever

Claims (1)

(57) [Claims] 1. A recording and / or reproducing head moving lever which is supported reciprocally and locked at a forward movement position, a switching lever which is supported reciprocally, and said recording and / or reproducing head. First urging means for urging the recording and / or reproducing head moving lever in the forward direction at the forward position where the moving lever is locked; and rotatable to the recording and / or reproducing head moving lever. The recording and / or reproducing head moving lever is pivoted in either direction by abutting against the switching lever when the lever moves forward, and the pinch is rotationally restricted at the forward position. A roller moving lever; and a second urging means for urging the pinch roller moving lever toward a center position, wherein the pinch roller moving lever is in relative contact with the pinch roller moving lever. At least one of the switching lever is an inclined surface, and the pinch in which the urging force by the first urging means on the recording and / or reproducing head moving lever at the forward movement position is restricted by the first urging means. A tape recorder, wherein the switching lever is urged toward a center position via a roller moving lever, and the urging force of the second urging means urges the switching lever toward the center position.