JP3036134B2 - Tape recorder protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for preventing a collision between a cassette half and a magnetic head in a tape recorder.

[0002]

2. Description of the Related Art When a PLAY or REC operation is performed in a state where a cassette half is not mounted at a fixed position of a tape recorder, a magnetic head comes into contact with an end face of the cassette half, and
There was a problem that they hurt each other. Especially in a power assist type soft touch mechanism tape recorder, since the magnetic head is pressed against the cassette half by the cam, the magnetic head bites into the end surface of the cassette half, making it impossible to remove the cassette half or forcibly removing it. Damage the half,
In addition, a large load is applied to the rubber belt for transmitting the power to the cam, which may cause the belt to come off.

Conventionally, measures have been taken to transmit power between a head substrate on which a magnetic head is mounted and an assist cam via a spring.

[0004]

However, in the conventional measures, the number of parts increases and the mechanism becomes complicated.
This has caused cost increases and breakdowns. Further, the spring bends with the magnetic head biting into the cassette half, and the rubber belt needs to transmit power only by rotating the assist cam, so that the belt tension becomes larger than that of a normal tape recorder. Therefore, the side pressure loss applied to the motor increases, and in particular, there is a problem that the battery life is shortened in a portable tape recorder, and there is a risk that the surface of the magnetic head may be damaged.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cassette for storing and opening and closing a cassette half.
Holder and the cassette holder
Moves against the urging force in conjunction with closing the rudder
A first member, a substrate having a magnetic head,
An operating rod that drives the plate forward, and
And the operating state of the operating rod is locked.
And a second member that locks the first member.
The holder of the set holder and the movement of the second member are prevented.
A holding portion for stopping, the holding member having the first member
The part is in front of the lock claw provided on the cassette holder
A guide surface for moving the first member against the urging force;
A lock surface for holding the lock claw by the urging force is provided.
The second member may include the blocking portion provided on the first member.
The engaging portion of the operating rod and the engaging portion of the operating rod
A guide surface for moving the second member and an engaging portion thereof are held.
The cassette holder is open.
Or, in the closed state, the first member is actuated by the urging force.
In a state of being biased to one side, the locking portion of the second member is
The first member can be moved without contacting the blocking portion.
The operation rod is configured to be operable,
When closing the cassette holder, the lock claw is
Incompletely closed position in contact with the guide surface of
In the cassette holder inserted in the cassette holder.
When the set half end face and the magnetic head
The first member has moved against the urging force.
And the locking portion of the second member abuts the blocking portion.
Position so that operation of the operating rod is prevented.
It is configured as follows.

[0006]

According to the present invention, in particular, the present invention
When the cassette holder is held in the closed state,
The magnetic head faces the end face of the cassette half inserted inside
The first member is biased by the
Position where the second member is moved
When the locking portion comes into contact with the operating rod,
, The contact between the magnetic head and the cassette half end face can be reliably prevented, and since the spring between the head substrate and the assist cam can be eliminated, the mechanism can be made thin and simple, and there is no need to increase the belt tension. Therefore, it has many advantages such as low current consumption of the motor.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail with reference to FIG. 1 to 3, reference numeral 1 denotes a head substrate, which has a bent portion 2 at a center portion, and a magnetic head 3 is fixed thereto. Further, a spring hook 4 and a long hole 5 are provided at the front end, a long hole 6 is provided on the right side of the opposite end, and a concave portion 7 is provided on the left end surface. Reference numeral 8 denotes a mechanical board, which has long holes 5 and 6 fitted to shafts 9 and 10 erected on the upper surface, and slidably holds the head board 1 in the direction of arrow AB. . 11 is a torsion spring,
It is mounted on the mechanical substrate 8 and a shaft 12 erected on the upper surface. One end of the arm is in contact with the locking shaft 13 and the other end is engaged with the spring hook 4 to constantly bias the head substrate 1 in the direction of arrow B.

Reference numeral 14 denotes an operation rod for holding a PLAY button, which has an engaging portion 15 and a spring hooking portion 16 at a central portion.
The tip has a long hole 17. At the right end, a pressing portion 19 is provided at a position that penetrates a long hole 18 provided in the mechanical substrate 8 and faces the concave portion 7 of the head substrate 1. The guide shaft 2 erected on the lower surface of the mechanical substrate 8
0 penetrates through the long hole 17 and the side surface of the operation rod 14 is guided by a guide groove 21 provided on the side surface so that an arrow AB
It is slidably held in the direction. Reference numeral 22 denotes a torsion spring, which is mounted on a shaft 23 erected on the lower surface of the mechanical substrate 8,
One end of the arm is engaged with the locking shaft 24, and the other end is engaged with the spring hook 16 to urge the operation rod 14 in the direction of arrow B.

Reference numeral 25 denotes a lock plate, which has a pressing portion 2 at the center.
6. At the left end, a spring hook portion 27, a drive portion 28 having a L-shaped tip, and a long hole 29 are provided. Further, a locking portion 30 and a long hole 31 are provided at the right end, and a slope 32 and a U-shaped holding portion 33 are provided at a position facing the engaging portion 15 of the operation rod 14. Then, guide shafts 34, 35 erected on the lower surface of the mechanical substrate 8
Penetrates the long holes 29 and 31 and pushes the lock plate with an arrow D
It is slidably held in the C direction.

Reference numeral 36 denotes a torsion spring.
The arm is mounted on a shaft 37 erected on the lower surface, and one end of the arm is
8 and the other end is engaged with the spring hooking portion 27 to urge the lock plate 25 in the direction of arrow D. 39 is a motor switch mounted on the lower surface of the mechanical board 8;
The detection unit 40 faces the drive unit 28 of the lock plate 25.
Is provided.

[0011]

Reference numeral 51 denotes an L-shaped trigger lever, which has a pivot hole 52 at the center and an engagement pin 53 at the tip of one arm. Further, spring locking portions 54 and 55 are provided at the tip and the root of the other arm, respectively, and are rotatably mounted through a shaft 56 provided on the lower surface of the mechanical substrate 8.

Numeral 57 denotes a torsion spring which is mounted on the outer boss of the pivot hole 52 of the trigger lever 51. The short arm engages with the spring engaging portion 54 and the long arm engages with the spring engaging portion 55, respectively. The tip of the arm is in a positional relationship facing the pressing portion 26 of the lock plate 25. Reference numeral 58 denotes an assist cam gear having a pivot hole 59 at the center and an assist cam portion 60 and a control cam portion 61 on both side surfaces. A concave portion 62 is provided in the assist cam portion 60, and the bent portion 2 of the head substrate 1 is usually inserted therein. The control cam portion 61 has a locking portion 63 and a slope portion 64, and the engaging pin 53 of the trigger lever 51 is normally engaged with the locking portion 63. Further, a gear 66 having a missing tooth 65 is provided on the outer peripheral surface, and the gear 66 is rotatably penetrated by a shaft 67 erected below the mechanical substrate 8. Reference numeral 68 denotes a flywheel, which has a small gear 69 at the center, and a capstan shaft 7.
0 is press-fitted. The capstan shaft 70 is rotatably inserted through a bearing 71 erected on the mechanical substrate 8. 72 is a motor pulley;
Is press-fitted to the rotating shaft 74.

A belt 75 is provided between the outer periphery of the flywheel 68 and the motor pulley, and transmits the rotation of the motor 73 to the flywheel.

Reference numeral 76 denotes a holding plate, which has a long hole 77,
78 and a spring hook 79. On the left side surface, a projection 8 is provided at a position substantially facing the locking portion 30 of the lock plate 25.
0, and the tip of the projection 80 and the locking portion 30
The gap a and the right side surface of the engaging portion 15 of the
The distance b of the side surface of the holding portion 33 of the hook plate 25 is a function of a ≧ b.
I'm in charge. Further, on the right side, an L-shaped holding portion 8 is provided.
The holding portion 81 is composed of a guide surface 82 and a lock surface 83. Guide shafts 84 and 85 erected on the upper surface of the mechanical substrate 8 penetrate the elongated holes 77 and 78 and are slidably mounted in the direction of arrow AB.

Reference numeral 86 denotes a drawing spring, which is provided between a spring hook 79 of the holding plate 76 and a pin 87 erected on the upper surface of the mechanical substrate 8 to urge the holding plate 76 in the direction of arrow B. Reference numeral 88 denotes a cassette holder, which swings freely around a rotation shaft 89. A lock claw 90 is provided on the side surface. The cassette claw 90 is brought into contact with the guide surface 82 of the holding plate 76 by the swinging operation of the cassette holder and is held by the lock surface 83. Reference numeral 91 denotes a cassette half, which is usually housed in the cassette holder 88.

The operation of the protection device for a tape recorder configured as described above will be described below.

First, when the operating rod 14 is pushed in the direction of arrow A against the torsion spring 22 in FIG.
Is pressed by the pressing portion 19 into the concave portion 7 and the torsion spring 11 is pressed.
Move forward against At the same time, the slope 32 of the lock plate 25 is also pushed by the engagement portion 15, and slides in the direction of arrow C against the torsion spring 36. The motor switch 39 is turned on by the operation of the lock plate 25, and the motor 73 rotates. The rotational force of the motor 73 is base from the motor pulley 72
The capstan shaft 70 and the small gear 69 rotate by being transmitted to the flywheel 68 by the bolt 75.

The trigger arm 51 also swings counterclockwise when the long arm of the torsion spring 57 is pressed by the pressing portion 26, and the engaging pin 53 is moved to the slope 64 of the control cam 61.
To rotate the assist cam gear 60 clockwise. When the operating rod 14 is further pressed, the engaging portion 15 is disengaged from the slope 32 of the lock plate 25 as shown in FIG. On the other hand, when the head substrate 1 also advances and the bent portion 2 separates from the concave portion 62 of the assist cam portion 60, the engaging pin 53 pushes the slope portion 64 by the pressure of the torsion spring 57, and the assist cam gear 60 rotates clockwise. to start. Then, the missing tooth 65 moves, the gear 66 meshes with the small gear 69, and the rotational force of the motor 73 is transmitted to rotate the assist cam gear 60. The head substrate 1 that has been advanced to a certain position by the operation rod 14 is further advanced by the driving force of the assist cam portion 60 due to the rotation of the assist cam gear 60, and the PL is moved.
The AY position is reached.

The above is the case where the cassette holder 88 is completely closed as shown in FIG. 3 and the cassette half 91 is stored in a fixed position. However, as shown in FIG. 6, the cassette holder 88 is not completely closed. In such a case, the lock claw 90 comes into contact with the guide surface 82 of the holding portion 81, and the holding plate 76 is being moved in the direction of arrow A against the tension spring 86. When the operating rod 14 is pushed in the direction of arrow A against the torsion spring 22 in this state, the lock plate 25 also slides in the direction of arrow C against the torsion spring 36 by pressing the slope 32 by the engagement portion 15. The locking portion 30 collides with the projection 80 of the holding plate 76, and the operation of the lock plate 25 is prevented. Therefore, the movement of the operation rod 14 is also prevented, and the magnetic head 3 on the head substrate 1 can be stopped before colliding with the end face of the cassette half 91. Further, since the lock plate 25 moves halfway, the motor switch 39 is turned on and the motor 73 is turned on.
Rotates, and the assist cam gear 60 is activated. However, since the head substrate 1 is stopped halfway, the bent portion 2 is in the concave portion 62 and the rotation of the assist cam gear 60 is prevented.

The content of preventing collision between the end face of the cassette half 91 and the magnetic head 3 when the cassette half 91 is not mounted at the fixed position of the tape recorder is described above. With this configuration, the lock claw 90 of the cassette holder 88 is held. Part 8
When the cassette holder 88 is further apart from the guide surface 82, that is, when the cassette holder 88 is further opened, the holding plate 76 is in the same state as when the cassette holder 88 is completely closed. 7, the lock plate 25 is held at the lock position as shown in FIG. At this time, if a <b, the cassette holder 88 is closed as it is, and the lock claw 90 is
When the holding plate 76 is pushed in the direction of arrow A while
Cassette holder 88 locking portion 30 collide closes Do <br/> rather Nari and, although problem damaged if forcibly closes occurs, projection 80 and the locking portion 30 if the relationship of a ≧ b Since there is a gap between them, no collision occurs.

[0022]

As described above, the present invention provides a cassette half
The cassette holder that stores and opens the
At the same time as closing the cassette holder
A first member that moves against the urging force and a magnetic head.
Board having an operating rod and an operating rod for driving the board forward
Move in conjunction with the operation of the operating rod and
A second member for locking the operating state of the working rod,
The first member includes a holding portion of the cassette holder,
Providing a blocking portion for blocking movement of the second member,
The holding part of the first member is provided on a cassette holder.
A first member against which the locking claw abuts against the urging force;
And the locking claw are moved by the urging force.
The second member is provided with a first lock surface.
An engaging portion provided on the member for contacting the blocking portion;
Guide in which the engaging portion of the pad comes into contact and moves the second member
Surface and a holding portion for holding the engaging portion thereof,
When the cassette holder is open or closed, the first
The member is biased to one side by the biasing force,
The locking portion of the second member abuts the blocking portion of the first member
The operating rod can be moved without
When the cassette holder is closed,
At the position where the lock claw contacts the guide surface of the holding portion.
When the cassette is held in an incompletely closed state,
Hold the cassette half end face inserted in the holder
When the first member is in a state in which the
It is the position where it has moved against the urging force,
The position where the locking portion of the member abuts is
Is obtained by configured to block operation of the rod, skein was particularly accommodating the cassette half without increasing the parts
Detects the incomplete closed state of the tape recorder apparatus Ttohoruda by blocking the operation of the operating rod, can be reliably prevent collision of the magnetic head and the cassette half
Operating when the cassette holder is open or closed
This is an effective means that the rod can be operated .
Further, not only in this embodiment, but also in a pure mechanical tape recorder that does not use power assist, the magnetic head does not abut against the cassette half, which is very effective as a protection device.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment of the present invention.

FIG. 3 is a side view of the embodiment of the present invention.

FIG. 4 is a plan view showing a PLAY operation blocking state when the cassette holder is not completely closed.

FIG. 5 is a front view showing a PLAY operation blocking state in a state where the cassette holder is not completely closed.

FIG. 6 is a side view showing a PLAY operation blocking state in a state where the cassette holder is not completely closed.

FIG. 7 is a plan view showing a state where the PLAY operation is completed with the cassette holder completely closed or open.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head board 3 Magnetic head 14 Operation rod 15 Engagement part 25 Lock plate 30 which is a 2nd member 30 Locking part 32 Slope 33 Holding part 76 Holding plate which is a first member 82 Guide surface 83 Lock surface 88 Cassette holder 90 Lock claw 91 cassette half

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/675 101

Claims (2)

(57) [Claims] 1. A cassette for storing and opening a cassette half.
The cassette holder is biased to one side and moved in opposition to the biasing force in conjunction with the operation of closing the cassette holder.
A first member that moves , a substrate having a magnetic head, an operation rod that drives the substrate forward , and an operation state that moves in conjunction with the operation of the operation rod and controls the operation state of the operation rod.
A second member that locks the cassette holder , wherein the first member has a holding portion of the cassette holder;
A holding portion for preventing movement of the second member, wherein the holding portion of the first member is a cassette holder;
The locking claw provided on the first contact
The guide surface for moving the member and the locking claw thereof.
A lock surface is provided for holding by force, and the second member contacts the blocking portion provided on the first member.
The engaging portion of the operating rod is in contact with the engaging portion of the operating rod.
Guide surface for moving the member, and a retaining surface for holding the engaging portion.
The cassette holder when the cassette holder is open or closed.
The member 1 is urged to one side by the urging force.
Thus, the locking portion of the second member contacts the blocking portion of the first member.
The operating rod is movable without touching it.
The lock claw is held when closing the cassette holder.
Incompletely closed position where it contacts the guide surface of the
When held, it is inserted into the cassette holder.
Positional relationship between the end of the cassette half and the magnetic head
The first member moves against the biasing force.
And the locking portion of the second member abuts the blocking portion.
To prevent operation of the operation rod.
A protection device for a tape recorder, characterized in that it is configured as follows . 2. A method according to claim 1, wherein said first member has a blocking portion and said second member has a blocking portion.
Move by operating the operation rod according to the dimension between the locking parts.
From the starting position to the position where the operation rod is completely held
The movement amount of the second member is large or the same.
2. The protection device for a tape recorder according to claim 1 , wherein the protection device is configured as follows .