JP3239801B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder which is effective in reducing the size, thickness and cost of a cassette tape recorder for a headphone stereo.

[0002]

2. Description of the Related Art In order to reduce the thickness and size of a tape recorder, it is generally widely used to arrange a gear train for transmitting the power of a motor at a reduced speed, a tape end detecting mechanism, and a reduction ratio switching mechanism in the vicinity of a reel shaft because the overall structure can be made thinner. Has been adopted.

[0003]

However, in the case of a tape recorder for headphone stereo, a printed wiring board on which electric components are mounted is arranged on the rear surface, so that large electric components cannot be inserted or gaps such as gears and levers are formed. Since it is necessary to arrange the electric components for the purpose, the design of the printed wiring board is burdensome and inconvenient. In addition, expensive small electric components must be used, which has been a factor of high cost.

[0004]

In order to solve the above-mentioned problems, a tape recorder according to the present invention comprises a motor for driving a tape, a driving force transmitting mechanism for transmitting a driving force of the motor to a capstan and a reel shaft, a main substrate Attach the motor and the transmission mechanism to the rear side, disposed on the main top surface of the substrate and the head substrate provided slidably with respect to the main board, a portion of the main board to the main board The placed head
First step formed so as to be flush with a part of the substrate
On the main board upper surface position than the first step bending portion.
A second step bent portion formed so as to be
And a printed circuit board on which electrical components are mounted on the surface side so as to sandwich the transmission mechanism, and a printed circuit board on which a predetermined circuit is configured, except for a reel gear portion for driving a reel shaft among components constituting the transmission mechanism A deceleration transmission mechanism is centrally disposed at the first step bending portion near the capstan , and the rear surface of the main board is
Among the components mounted on the printed circuit board mounted to the side, a large part by <br/> arranged at a position opposed to the second stage bending portion not facing the position where the concentrated arrangement of the transmission unit It has the effect of being compact, thin and inexpensive.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is a motor for driving a tape, a driving force transmitting mechanism for transmitting the driving force of the motor to a capstan and a reel shaft, and a rear surface of the motor and the transmitting mechanism. A main substrate attached to the main substrate, a head substrate disposed on the main substrate upper surface and slidably provided with respect to the main substrate, and a part of the head substrate disposed on the main substrate and part of the main substrate. A first step bent portion formed so as to be on the same plane as the above, a second step bent portion formed so as to be further at the upper surface position of the main substrate than the first step bent portion, and a back side of the main substrate A printed circuit board on which electric components are mounted so as to sandwich the transmission mechanism, and a predetermined circuit is formed, and the head substrate has a central portion.
Shape, and the first step bent portion is within the recessed area.
A speed reduction transmission mechanism other than a reel gear section for driving a reel shaft among components constituting the transmission mechanism is centrally disposed in a first step bent portion near a capstan; Among the components mounted on the printed wiring board attached to the side, the large component is disposed at a position facing the second step bending portion which does not face the position where the transmission portion is centrally arranged, so that the large electric component Enters
Space is created, and electrical components can be arranged relatively freely
Less restrictions on printed wiring board design
In addition, it has an effect that it can be configured to be small, thin and inexpensive.

[0006]

(Embodiment 1) FIG. 1 is a partial external plan view of a tape recorder according to an embodiment of the present invention.
3 is a front view of the same part, FIG. 4 is a rear view of the same part, FIG. 5 is a back view mainly showing a motor power transmission system, and FIG. 6 is a back view mainly showing a mechanism operation system. FIG. 7 is a partial left side view of FIG. 2, wherein (a) shows a stopped state, (b) shows a play state, and shows a state where there is no cassette tape.

In FIG. 1, reference numeral 1 denotes a motor,
The screw is fixedly fastened to the motor holder 3 fixed to the motor holder 3. A motor pulley 5 is provided at the end of the rotating shaft 4 of the motor 1.
Are press-fitted and fixed. Reference numeral 6 denotes an intermediate pulley having two steps of V grooves, which is rotatably mounted on a pulley shaft 7 planted on the main board 2. Reference numeral 8 denotes a belt A suspended between the motor pulley 5 and one V groove of the intermediate pulley 6. Reference numeral 9 denotes a normal rotation flywheel, which has a V-groove on the outer periphery, and a normal rotation capstan 10 is press-fitted and fixed at the center. Reference numeral 11 denotes a forward rotation side metal, which is fixed to the main substrate 2 so as to penetrate therethrough, and into which the forward rotation capstan 10 is rotatably inserted. Reference numeral 12 denotes a reversing flywheel, which has a V-groove on the outer periphery, a flywheel gear 13 is provided at the center, and a reversing capstan 14 is press-fitted and fixed. Reference numeral 15 denotes an inverting metal, which is fixed to the main substrate 2 so as to penetrate therethrough, and into which the inverting capstan 14 is rotatably inserted. A belt B is suspended between the other V-groove of the intermediate pulley 6, the V-groove of the normal flywheel 9 and the V-groove of the reversing flywheel 12.

Reference numeral 17 denotes a main gear, which has a gear on the outer periphery and an eccentric cam 18a on one side surface.
The switching cam 19a is provided on the inner peripheral side at the center position of the remaining half circumference, and the escape cam 19b is provided on the outer peripheral side. On the other side is a friction gear 20 in the longitudinal direction.
However, it is attached via a felt 21 by a conical spring 22 to which a constant friction torque is applied. A through hole is provided at the center, and is rotatably attached to a shaft 24 implanted in the first step bending 23 of the main substrate 2. Further, an outer peripheral gear meshes with the flywheel gear 13. 25 has a through hole and hexagonal ball scan the gear, the central portion to the outer peripheral A playing gear. In addition, there is a tapered portion 26 in the middle,
The main board 2 is rotatably mounted on a grooved shaft 27 implanted in the first step bending 23. Reference numeral 28 denotes a friction lever which has a shape like a hole in the center of the frying pan, has a pin 29 at the tip of the handle, and is rotatably inserted through the hexagonal boss 26 of the play gear 25. ing. Reference numeral 30 denotes a fast-forward gear, which has a gear at the outer periphery and a hexagonal hole at the center, and is mounted on the hexagonal boss 26 of the play gear 25 so as to rotate integrally therewith. Reference numeral 31 denotes a cylindrical compression spring, one end of which is in pressure contact with a washer 32 attached to the groove of the grooved shaft 27, and the other end of which is in contact with the side surface of the rapid feed gear 30. In the direction of the main substrate to apply a constant torque to the friction lever 28. In the stop state, the fast-forward gear 30 meshes with the main gear 17 and the play gear 2
5 and the friction gear 20 are opposed to each other.

Reference numeral 33 denotes a reduction gear, which has a gear with a wide tooth width on the outer periphery, and has a small gear 34 and a through hole in the center,
The main board 2 is rotatably inserted into a stepped shaft 36 implanted in a second step bending 35. Also, this reduction gear 3
3 always meshes with the play gear 25. A switching gear 37 has a gear on the outer periphery and a through hole in the center, and has a rotating shaft 3 implanted on one arm of the switching lever 38.
9 and is always rotatably engaged with the small gear 34. The switching lever 38 has a through hole in the center, and the other arm has a pin 40a planted through the first step bending 23 of the main board 2 and a pin planted on the opposite side. 40b and a pin 40c.
4 is rotatably mounted.

Reference numeral 41 denotes a reel base gear F which has a reel claw 42 at the tip and is rotatably mounted on a reel shaft 43 which is planted on a surface of the main board 2 projecting from the second step 35 to the rear side. Have been. Reference numeral 44 denotes a relay gear,
Is rotatably mounted on a shaft 45 implanted in the second step bend 35. The relay gear 44 and the reel base gear F41 are located at positions opposing the switching gear 37, and are in a positional relationship in which they are engaged with each other by the rotational movement of the switching lever 38. Reference numeral 46 denotes a reel base gear R, which has a reel claw 47 at its tip and is rotatably mounted on a reel shaft 48 implanted on a surface of the main board 2 projecting rearward from the second step bending 35. It always meshes with the relay gear 44. Reference numeral 49 denotes a detection lever having three arms, which has a long hole 50 at the tip of the short arm and a pin 29 at the tip of the friction lever 28.
A tear-shaped pin 51 is provided at the tip of one long arm along the groove cam 18 of the main gear 17, and a D-shaped pin 52 is provided at the tip of the other long arm. It is provided toward the main board 2 and is rotatably mounted on a shaft 53 implanted in the main board 2.

Numeral 54 denotes a direction lever having a knob 55 for manual operation on one side and a pin-shaped resin spring A57a provided through the main board 2 at the other intermediate position. , A resin pillow B57b, and an arcuate pillow 58 is provided on the outer periphery thereof. On the extension of the arcuate pillow 58, a spring receiver 59 having a V-groove at about a half of the end is provided, and a central portion has an arm A60a and an arm B60b for automatic switching and a through hole. And, it is rotatably mounted on a shaft 61 implanted in the main board 2.
Reference numeral 62 denotes a left-right symmetrical forward / reverse lever. A square hole 63 is provided at a central portion at a position where the detection lever 49 is engaged with the D-shaped pin 52, and a resin spring A of the direction lever 54 is provided.
An elliptical pin 64 is provided at a position where it engages with the side surface 57a. Rotation fulcrum A65a and rotation fulcrum B65b are formed at the left and right ends at approximately 周 circular arcs. A projection A66a and a projection B66b are provided at positions opposing the arms A60a and B60b, and the pillow 58 of the direction lever 54 and the detection lever 49 are provided.
Are slidably and rotatably sandwiched between them. The square hole 63 has such a size that the eccentric cam 18a of the main gear 17 swings the detection lever 49 so that the D-shaped pin 52 does not move even if it moves a fixed stroke. 67
a, 67b are fulcrum pins A, B implanted on the main board
The resin spring A57 is located at a position opposing the pivot fulcrum A65a and the pivot fulcrum B65b of the forward / reverse lever 62, and when the direction lever 5 is at the forward rotation position.
a, the elliptical pin 64 of the forward / reverse lever 62
In the direction indicated by the arrow in FIG.
Is in contact with In the reverse position, the elliptical pin 64 is urged in the direction opposite to the arrow A by the resin spring B57b to bring the rotation fulcrum A65a into contact with the fulcrum pin A67a. Reference numeral 68a denotes a stopper A provided on the forward rotation side metal 11, and 68b denotes a stopper B implanted on the main substrate 2 when the forward / reverse lever 62 rotates the detection lever 49 clockwise. Prevents overshoot.

Reference numeral 69 denotes a U-shaped head substrate, which is bent at the center to the same height as the first step bending 23 of the main substrate 2 and opposed to the tapered portion 26 of the play gear 25. Are provided with a conical projection 70 and a beak-shaped slope 71 for driving the pin 40a of the switching lever 38.
In the vicinity thereof, a lock claw 72 bent through the main board 2 and a long hole 73a are provided. On one end surface, a spring hook 74 bent through the main board 2 is provided.
A long hole 73b is provided on the other end surface. Further, a guide hole A73c and a guide hole B73d are provided on the near side, and a guide pin A75a implanted in the main board 2 is provided.
The elongated holes 73a and 73b are slidably inserted into the guide pin B75b. Reference numeral 76 denotes a forward / reverse rod, which is provided with a concave portion 77 having an inclined surface at a position opposed to the pin 40a of the switching lever 38 at the center, and slidably engages with the pin 56 of the direction lever 54 at one end surface. The head substrate 69 has a guide 78 having a U-shaped cross section.
A pin A79a and a pin B79b are provided on the surface of the head substrate 69, and are slidably mounted in the guide holes A73c and B73d of the head substrate 69. Reference numeral 80 denotes a detent spring, which is mounted on a shaft 81 implanted on the main board 2.
Of the direction lever 5
In order to bias 4 to the normal rotation position or the reverse rotation position, it is bent in an approximately half position of the rotation stroke. Further, the other arm is engaged with a spring hook 74 of the head substrate 69,
This head substrate 69 is urged in the direction of arrow B.

Reference numeral 82 denotes a lock plate having an inclined surface 83 and a lock portion 84 at one end for engaging with the lock claws 72 of the head substrate 69, and a spring hook 85 and an L-shaped bend 86 at the other end. L-shaped bending A87a, L-shaped bending B87b in the center
have. Elongated holes 88a, 88b are provided near both ends, and guide pins 89a,
89b is slidably mounted. Numeral 90 denotes an FF rod, which is bent in the vicinity of the center, and has a slope 91a and a holding portion 91b at a position opposed to the pin 40b of the switching lever 38.
And an L-shaped bent A87 of the lock plate 82.
The side guides provided on the main substrate 2 are provided with a deformed hole having a slope 92 and a lock portion 93 at a position where the main substrate 2 is engaged with the hole. 9
6a, 96b and slidably mounted on guide pins 97 implanted in the first step bending 23. 98 is RE
It is a W rod, has a bent slope 99a and a holding portion 99b at a position opposing the pin 40c of the switching lever 38, and has a slope 100 and a lock portion 101 at a position where it engages with the L-shaped bent 87b of the lock plate 82. To provide a deformed hole
A spring hook 102 is provided on the end surface, and a long hole 103 is provided in the vicinity of the spring hook 102. Side guides 104a,
104b and slidably mounted on the guide pin 105. Reference numeral 106 denotes a stop rod, which is bent stepwise at the center, has a bent slope 107 at a position where it engages with the L-shaped bend 86 of the lock plate 82, and has a spring hook 108 at its tip.
Has a long hole 109 in the vicinity thereof, and is slidably mounted on the side guides 110a and 110b implanted in the main board 2 and the guide pins 111.

Reference numeral 112 denotes a rod spring,
Is mounted on the shaft 113 implanted in the second step bend 35. Then, one arm is engaged with a spring hook 94 of the FF rod 90 to urge the FF rod in the direction of arrow B,
The other arm is engaged with a spring hook 102 of the REW rod 98, and this REW rod is also urged in the direction of arrow B.
Reference numeral 114 denotes a lock spring which is a shaft 1 implanted on the main board 2.
15, one arm is engaged with a spring hook 85 of the lock plate 82 to urge the lock plate 82 in the direction of arrow C, and the other arm is a spring hook 108 of the stop rod 106. And urges the stop rod 106 in the direction of arrow B. Reference numeral 116 denotes a printed wiring board, and the motor pulley 5 on the back of the tape recorder mechanism
It is installed thin in a range excluding the intermediate pulley 6 and the belt A8. A hatched area 117 indicates an area in which a large electric component can be arranged.

Next, the operation will be described. FIGS. 1, 2 and 3 show the stopped state after the forward play or the FF operation. First, the forward play operation will be described. Head substrate 6
9 is pressed against the biasing force of the detent spring 80 in the direction opposite to the arrow B, the play gear 25 is pressed against the compression spring 31 by the contact between the conical projection 70 and the tapered portion 26 of the play gear 25. It slides away from the main board 2. By this operation, the main gear 17 and the fast-forward gear 30
Are disengaged, the friction gear 20 and the play gear 25 are engaged with each other, and at the same time, the pin 40a of the switching lever 38 is positioned by the guide of the concave portion 77 of the positive / reverse rod 76, and the switching gear 37 and the reel base gear F41 are reliably engaged with each other. On the other hand, the lock plate 82 slides in the direction opposite to the arrow C against the biasing force of the lock spring 114 by the sliding operation of the lock claw 72 of the head substrate 69, and the sliding movement of the head substrate 69 ends. When the lock claw 72 reaches the lock portion 84 in the vicinity, the lock plate 82 slides again in the direction of the arrow C by the urging force of the lock spring 114. Therefore, even if the pressing of the head substrate 69 is released, the normal rotation play state is maintained. Will be retained. Further, the motor 1 rotates counterclockwise, and the belt A8, the intermediate pulley 6,
The forward flywheel 9 and the reversing flywheel 12 rotate by being transmitted to the belt B16. Further, the flywheel gear 13 transmits gears to the main gear 17, the friction gear 20, the play gear 25, the reduction gear 33, the switching gear 37, and the reel. The table gear F41 is rotated.

Next, in order to manually switch to the reversal play, the direction lever 54 is tilted in the direction of arrow C.
The forward / reverse rod 76 slides in the direction opposite to the arrow C, the switching lever 38 is rotated by the depression of the concave portion 77 engaged with the pin 40a, and the switching gear 37 meshes with the relay gear 44 to rotate the reel base gear R46. . The auto-reverse operation will be described later in detail.

In the FF operation, the FF rod 90 is connected to the rod spring 1.
12, the pin 40b of the switching lever 38 rotates counterclockwise by the inclined surface 91a and is held by the holding portion 91b.
7 engages with the reel base gear F41, while the lock plate 8
2, L-shaped bending 87a is pressed by pressing the slope 92,
It slides in the direction opposite to the arrow C against the urging force of the lock spring 114. When the lock portion 93 reaches the L-shaped bend 87a near the end of the operation stroke of the FF rod 90, the lock portion 114 slides again in the direction of arrow C by the urging force of the lock spring 114, so that the pressing of the FF rod is released. The FF state is also maintained.

In the REW operation, when the REW rod 98 is pressed in the direction of arrow B against the urging force of the rod spring 112, the pin 40c of the switching lever 38 is rotated clockwise by the bent slope 99a and held by the holding portion 99b. You. At the same time, the switching gear 37 meshes with the relay gear 41, while
The lock plate 82 is L-shaped bent 87 by pressing the slope 100.
b is pressed, and the arrow C is pressed against the urging force of the lock spring 114.
And slide in the opposite direction. Then, near the end of the operation stroke of the REW rod 98, the lock portion 101
When it reaches the bent portion 87b, it slides again in the direction of arrow C by the urging force of the lock spring 114.
The REW state is maintained even if the pressing of the EW rod is released.

When the stop rod 106 is pressed against the lock spring 114 in the direction opposite to the arrow B, the L-shaped bent portion 86 of the lock rod 90 slides in the direction opposite to the arrow C by the bent slope 107 to stop the head substrate 69. Is returned in the direction of arrow B by the urging force of the detent spring 80, and F
F rod 90 and REW rod 98 are rod springs 112
And return to the direction of arrow B to stop.

FIG. 8 is a partial cross-sectional view showing the relationship between the first step bending (hatched portion) of the main substrate 2 in FIG. 1, deceleration switching, and the friction mechanism, and FIG. 9 is a diagram showing the relationship between the flywheel R and the reel base gear R in FIG. 10 is a partial cross-sectional view showing the positional relationship of the motor power transmission system up to FIG. 10. FIG. 10 is a partially enlarged view of the auto-reverse mechanism of FIG. 6, (a) shows the positional relationship between the detection lever and the forward / reverse lever, and (b) shows the forward / reverse lever. The positional relationship of the direction lever is shown. Further, the head substrate 69 in FIG. 1 is not limited to the U-shape but may be an L-shape.

Next, the automatic reverse operation from normal rotation to reverse rotation will be described. 11 to 13, in the play state, the friction lever 28 rotates counterclockwise due to the counterclockwise rotation of the play gear 25, and the detection lever 49 is constantly urged to rotate counterclockwise. . On the other hand, the main gear 17 rotates clockwise, and the eccentric cam 18a rotates.
The tear-like pin 51 of the detection lever 49 is pushed in the inner circumferential direction at about a half circumference of the detection lever 49 to rotate the detection lever 49 counterclockwise, but the counterclockwise urging force of the friction lever 28 causes the detection lever 49 to rotate counterclockwise. The detection lever 49 rotates clockwise to return the tear-like cam to the outer periphery, and always passes the escape cam 19b. Thus, the detection lever 49 is connected to the main gear 17
Oscillating motion is repeated with a fixed stroke once per rotation. When the end of the tape is reached, the reel base gear F41 is locked, so that the friction gear 20 completely slips at the felt 21, the rotation of the play gear stops, and the counterclockwise urging force of the friction lever 28 disappears. On the other hand, the main gear 17 rotates clockwise irrespective of the end of the tape, and the tear-shaped pin 51 of the detection lever 49 is pushed in the inner circumferential direction by the eccentric cam 18a, but there is no urging force to return to the outer circumference. It contacts the cam 19a side. Then, the tearing pin 51 is further pushed in the inner circumferential direction by the switching cam 19a, and the detection lever 49 rotates counterclockwise.
The rotation of the detection lever 49 causes the forward / reverse lever 54 to rotate counterclockwise about the fulcrum pin A67a by the pressing of the D-shaped pin 52, and the projection A66a
The fourth arm A60a is pressed, and the direction lever 54 is rotated counterclockwise against the urging force of the detent spring 80. The forward / reverse rod 76 slides in the direction opposite to the arrow C by pressing the pin 56, and
a is pushed by the concave portion 77 and the switching gear 37 meshes with the relay gear 44 to switch to the reverse play. Next, the tear-like pin 51
Is in contact with the inner cam 18b after passing through the switching cam 19a, and conversely, is pushed in the outer circumferential direction and the detection lever 49 is rotated clockwise and returned, and the forward / reverse lever 64 is rotated clockwise by the D-shaped pin 52. Return. At this time, the elliptical pin 64 returns while bending the resin spring B57b, so that the forward / reverse lever is urged in the direction of arrow A by the resin spring B57b, and the rotation fulcrum A65a is pressed against the fulcrum pin A67a to perform the auto reverse operation. Complete.

Next, the auto-reverse operation from the reverse play to the normal play will be described. Since the operation is basically the same as the operation from the forward rotation, only the differences will be described. When the end of the tape in the reverse play is reached, the tear-like pin 51 is switched to the switching cam 19a.
The detection lever 49 is rotated in the counterclockwise direction, and the forward / reverse lever 54 is rotated clockwise about the fulcrum pin B67b as a fulcrum by pressing the D-shaped pin 52, and the projection B66b is directed. The arm B60b of the lever 54 is pushed, and the direction lever 54 is rotated clockwise against the urging force of the detent spring 80. The forward / reverse rod 76 slides in the direction of arrow C due to the pressing of the pin 56, and the pin 40a of the switching lever 38 is pushed by the concave portion 77 so that the switching gear 37 meshes with the reel base gear F41 to switch to the normal rotation play. Next, the detection lever 49 is moved to the inner circumferential cam 18.
When the rotation is returned clockwise by b, the forward / reverse lever 64
Is rotated counterclockwise by the D-shaped pin 52 and returned. At this time, the elliptical pin 64 is urged in the direction opposite to the arrow A by the resin spring A57a, and the rotation fulcrum B65b is moved to the fulcrum pin B.
The auto-reverse operation is completed at 67b.
11A and 11B show a state in which a transition from normal rotation to reversal is performed by extracting parts related to the auto-reverse in FIG. 6, wherein FIG. 11A shows a state immediately before switching, FIG. 11B shows a state immediately after switching, and FIG. This shows the completion of the switching of the pivot point. 12A and 12B show a state in which the state changes to the normal rotation again from the state of FIG. 11, wherein FIG. 12A shows a state immediately before switching, FIG. 12B shows a state immediately after switching, and FIG. ing.

[0024]

According to the present invention, there is provided a tape driving motor, a driving force transmitting mechanism for transmitting the driving force of the motor to a capstan and a reel shaft, and a main board having the motor and the transmitting mechanism mounted on the back side. A head substrate disposed on the upper surface of the main substrate and slidably provided with respect to the main substrate, such that a part of the main substrate is flush with a part of the head substrate disposed on the main substrate. A first step bent portion formed, a second step bent portion formed so as to be located on the upper surface of the main substrate further than the first step bent portion, and the transmission mechanism is sandwiched between the back side of the main substrate. mounting the placed electrical components and a printed circuit board which a predetermined circuit is configured, prior to
The head substrate shall have a hollow shape at the center.
The first step bending portion corresponds to the inside of the rounded area.
Form, of the part constituting the transmission mechanism, the speed reduction transmission mechanism except for the reel gear unit for driving the reel shaft concentrated disposed in the first stage bending portion near the capstan, attached to the back side of the main board Of the components mounted on the printed wiring board, the large components are arranged at a position facing the second step bending portion which does not face the position where the transmission section is concentratedly arranged, so that large electric components can enter. Space is born,
In addition, since the electrical components can be arranged relatively freely,
The design constraints of the wiring board are reduced, and there is no need to reduce the thickness of parts such as gears and levers, so there is no need to use expensive materials, no increase in the number of parts, and expensive small electric parts. Therefore, an inexpensive, small and thin tape recorder can be provided.

[Brief description of the drawings]

FIG. 1 is a partial external plan view of a tape recorder according to an embodiment of the present invention without a cassette tape;

FIG. 2 is a rear view of the same appearance.

FIG. 3 is an external front view of the same part.

FIG. 4 is a rear view of the same appearance.

FIG. 5 is a partial rear view mainly showing a motor power transmission system of FIG. 2;

FIG. 6 is a partial back view mainly showing a mechanism operation system of FIG. 2;

7A is a partial left side view of FIG. 2; FIG. 7B is a partial left side view of FIG. 2 showing the play state;

FIG. 8 is a partial cross-sectional view showing the relationship between the first step bending of the main board of FIG. 1, the deceleration switching mechanism, and the flywheel.

FIG. 9 shows a flywheel R to a reel base gear R of FIG.
Partial sectional view showing the positional relationship of the motor power transmission system up to

10A is an enlarged view showing the positional relationship between the detection lever and the forward / reverse lever of the auto-reverse mechanism of FIG. 6; FIG. 10B is the position of the forward / reverse lever and the direction lever of the auto-reverse mechanism of FIG. 6; Enlarged view showing the relationship

FIG. 11 is an excerpt of parts related to the auto-reverse in FIG. 6, showing a state immediately before switching from normal rotation to reverse rotation.

FIG. 12 is a diagram showing a state immediately after switching from the normal rotation to the reverse rotation;

FIG. 13 is a diagram showing a state where the forward rotation direction switching of the rotation fulcrum of the forward / reverse lever is completed.

14 is a diagram showing a state immediately before switching from the state of FIG. 13 to normal rotation again;

FIG. 15 is a diagram showing a state immediately after switching from the reverse to the normal rotation;

FIG. 16 is a diagram showing a state in which the switching direction of the rotation fulcrum of the forward / reverse lever is completely changed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 motor 2 main board 10 forward capstan 12 reverse capstan 17 main gear 23 first step bending 25 play gear 30 rapid feed gear 69 head board 116 printed wiring board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-62494 (JP, A) JP-A-59-68861 (JP, A) Real opening Sho-62-48087 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G11B 15/26 G11B 33/12

Claims (1)

(57) [Claims] 1. A motor for driving a tape, a driving force transmitting mechanism for transmitting a driving force of the motor to a capstan and a reel shaft, a main board having the motor and the transmitting mechanism mounted on a back side, and an upper surface of the main board And a first substrate formed so as to be slidable with respect to the main substrate and a part of the main substrate formed so as to be flush with a part of the head substrate disposed on the main substrate. Step bending portion and the first
A second step bending portion formed so as to be further at the upper surface position of the main board than the step bending portion, and an electric component mounted on the back side of the main substrate so as to sandwich the transmission mechanism, thereby forming a predetermined circuit. And a printed wiring board, wherein the head substrate has a shape with a hollowed central portion.
So that the first step bending portion corresponds to
Configured, among the parts constituting the transmission mechanism, the speed reduction transmission mechanism except for the reel gear unit for driving the reel shaft concentrated disposed in the first stage bending portion near the capstan, attached to the back side of the main board A tape recorder, wherein, among the components mounted on the printed wiring board, a large component is arranged at a position facing the second step bending portion which does not face the position where the transmission portion is concentrated.