JPH0127141Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder with an improved tape fast forwarding or fast rewinding mechanism.

In conventional tape recorders, a solenoid is kept in operation in order to maintain fast forward or fast rewind.

For this reason, power consumption increases and the capacity of the solenoid increases, which is inconvenient for cost reduction and miniaturization.

It is an object of the present invention to propose a tape recorder which solves the above-mentioned drawbacks, has a simple structure, and is designed to save power and reduce the capacity of the solenoid.

The features of this invention include an assist plate that is slid by an assist cam driven by a motor, and a sliding plate that is slid by a solenoid that controls the rocking of the drive gear that drives the reel shaft during fast forwarding or fast rewinding. The locking portion of the moving member is engaged with the engaging portion of the assist plate, and the fast forward or fast rewind state is maintained by the assist plate, thereby shortening the time for supplying power to the solenoid.

The present invention will be explained below with reference to illustrated embodiments. 1st
As shown in FIGS. 3 to 3, the tape recorder is provided with a head board 2, a play board 3, and an assist board 4 supported by pins 10, 11, and 12, respectively, on a chassis 1 so as to be able to slide vertically in the figure, and a capstan shaft 13. and the flywheel 14 and drive pulley 15 are the motor 16
A tape (not shown) configured to be rotated by a pulley is wound and rewound by a take-up reel shaft 19 and a rewind reel shaft 20 of reel stands 17 and 18.

A spring 21 is stretched between the head board 2 and the assist plate 4 provided on the lower side of the head board, and the head board 2 is struck by a perpendicular pin fixed to the assist plate (not shown). Contact surfaces 2a and 2b are formed to contact a pin 22 fixed on the chassis 1 and a pin 23 of the head stopper 5, and an erasing head 24 and a recording/reproducing magnetic head 25 are placed on the head board 2. ing.

Cam surfaces 3a and 3b are provided at two locations on the play plate 3.
is formed, two pins 26 and 27 are provided on the cam surface 3a, and the head stopper 5 is provided on the cam surface 3a.
The pin 28 of the idler arm 29 is in contact with the cam surface 3b, and the pin 30 of the idler arm 29 is in contact with the cam surface 3b.
6 is engaged with a pinch arm 32 which is rotatably supported on the chassis 1 by a support shaft 31, and the other play pin 27 is fitted into a "shaped through hole 6a" of the select plate 6.

The assist plate 4 is formed vertically as shown in FIG. 2, has an engaging portion 4a at the front end, a cam surface 4b at the left side, and has a spring 33 stronger than the spring 21 between one side and the chassis 1. is installed,
Pins 34, 34 are fixed to the upper surface, and an assist pin 35 is fixed to the lower surface. is in contact with an assist cam 36 of an assist gear 7 provided on the lower side of the chassis 1 as shown in FIG. The first part of the engaging part 4a
In the upper part of the figure, a deformed T-shaped sliding member 8 is horizontally suspended on the chassis 1 by a pin 37, and a movable element of a solenoid 38 provided at the right end is attached to the sliding member 8, which slides during fast forwarding and fast rewinding operations. being moved.
A pin 40 fixed to the arm lever 39 of the drive pulley 15 is in contact with the cam surface 4b.

The head stopper 5 is provided on the upper surface of the assist plate 4, as shown in FIGS. 1 and 3, so that it can be moved horizontally on the chassis 1 by means of a pin 41 that is horizontally suspended above the head board 2 and inserted into the elongated hole 5a. The pins 23 and 28 are pressed to the right by a spring 42, and the pins 23 and 28 are
is fixed, and a chevron-shaped protrusion is formed above to provide a cam surface 5b.

The select plate 6 is the assist plate 4 as described above.
The pins 34, 34 and the elongated hole 6b are provided so that the pins 34 and the elongated hole 6b can move freely, and the spring 43 is stretched between the chassis 1 and the spring 43 to bias the left side.
However, a cam surface 6c is formed on the left end surface, and a trigger pin 45 fixed to the trigger arm 44 and protruding upward is brought into contact therewith.

The assist gear 7 is rotatably supported by a shaft 46 fixed to the lower side of the chassis 1 as shown in FIG.
b is formed and the toothed portion 7a is attached to the capstan shaft 1.
The assist gear 7 is meshed with a capstan gear 47 fixed to the assist gear 3, and is configured to rotate clockwise in FIG. Furthermore, the toothless portion 7b and the shaft 4
A convex portion 7c is located on the opposite side of the pin 6, a pin 49 is fixed to the assist gear 7 at a position advanced by a certain angle from the toothless portion toward the convex portion, and a spring 50 having one end fixed to the chassis 1 is attached to the pin 49. 49, the assist gear 7 is urged to rotate clockwise. The protrusion 7c faces the trigger pin 45, which is fixed to the trigger arm 44 and projects downward, so as to be engaged therewith.

The sliding member 8 has a spring 51 between it and the chassis 1.
is tensioned and biased toward the left side, and the lock pawl 9 is rotatably supported by the pin 52, so that a spring 53 is tensioned between the spring hook 9a and the spring hook 8a of the sliding member 8. The pin 54 is biased to rotate counterclockwise and is prevented from rotating by a pin 54 fixed to the chassis 1. Furthermore, a concave portion is formed at the end of the leg shaft 8b of the sliding member 8 that protrudes toward the head board 2 side, into which the drive pulley 15 and the shaft portion 55 of the drive gear 56 are fitted.

A locking portion 9b is formed on the lock pawl 9, and the front end engaging portion 4a of the assist plate 4 faces to be engageable.

The driving pulley 15 and the driving gear 56 are provided coaxially on the shaft portion 55 and are supported by the arm lever 39, and the driving gear 56 faces the gear 57 of the rewinding reel shaft 20 and the idler gear 58 so as to be able to mesh with them. There is. The arm lever 39 is rotatably supported by a support shaft 59 shown in FIG. The idler gear 58 is meshed with a gear 60 fixed to the take-up reel shaft 19, and another gear 61 is further fixed to the take-up reel shaft 19 and is meshed with a gear 62 supported on the idler arm 29. 62 faces to mesh with the capstan gear 47 of the capstan shaft 13. The idler arm 29 is attached to the support shaft 63
It is rotatably supported by a shaft and biased to rotate counterclockwise by a spring 64.

A pinch roller 65 is provided on the pinch arm 32.
is rotatably supported on a shaft 66.

The trigger arm 44 is formed into an inverted L-shape as shown in FIG. 2, and is rotatably supported on the chassis 1 by a support shaft 67. The trigger pin 45 protruding from the upper and lower surfaces is fixed to one end, and the other A movable element of a trigger solenoid 68 is attached to the end.

When the tape recorder is constructed as described above and is in a playing state, the initial stop position of the assist gear 7 is as shown in FIG. When a short pulse current is applied to the trigger arm 44 and the trigger arm 44 is rotated clockwise as shown in FIG. This rotation causes the capstan gear 47 and the tooth portion 7a to
are engaged, and the assist gear 7 is rotated clockwise by the motor 16.

This rotation causes the assist pin 35 to move to the assist cam 3.
It is pushed upward in FIG. 2 by the large-diameter cam surface A of No. 6. At the same time, the selection plate 6 is also pushed to the right against the spring 43 due to the rotation of the trigger arm 44.
The trigger solenoid 68 is energized for a short time, and during this time, the assist plate 4 is not yet raised by the assist cam 36, so the play plate 3 is energized via the select plate 6.
is raised, and the assist plate 4, head board 2, and play plate 3 are in the play state shown in FIG. 4, and the pinch roller 65 is pressed against the capstan shaft 13 with a tape interposed therebetween. When the play plate 3 is raised, the cam surface 3
Since b is raised, idler arm 2 is connected to pin 30.
9 is rotated counterclockwise, the gear 62 meshes with the capstan gear 47 and the gear 61 of the take-up reel shaft 19, and the gear 61 is rotated counterclockwise to wind up the tape.

At this time, the pin 40 of the arm lever 39 on which the drive gear 56 is supported is about to be moved rightward by the cam surface 4b of the assist plate 4, but the pin 28 of the head stopper 5 is moved leftward by the cam surface 3a of the play plate 3. Since the pin 40 is pushed out to the left by the cam surface 5b, the drive gear 56 is not meshed with the gears 57 and 58.

The head board 2 is raised via a spring 21 on the assist plate 4, but the cam surface 2a is pressed against a pin 22 to restrict the raised position. In addition, a head stopper 5 is provided in front of the cam surface 2b.
Although there is a stopper pin 23, the head stopper 5 is moved leftward by the play plate 3 as described above, so it is not struck.

Next, in the fast rewind state, trigger solenoid 6
When a long pulse current is applied to 8, the trigger pin 45 is detached from the convex portion 7c and the select plate 6 is held in a state where it is pushed to the right. During this time, the assist cam 36 moves the assist pin 35 and the assist plate. 4. The head board 2 and select plate 6 are respectively raised to the positions shown in FIG. The play plate 3 is not raised because the play pin 27 is inserted into the vertical hole of the shaped through hole 6a of the select plate 6. If the play plate 3 is not raised, the pinch roller 65 remains in the position shown in FIG. 1 and the head stop 5 is not moved. Therefore, the head base plate 2 is stopped at the position where the cam surface 2b hits the stopper pin 23 of the head stopper 5.

As the assist plate 4 rises, the pin 40 fixed to the arm lever 39 of the drive gear 56 is moved to the cam surface 4b.
The drive gear 56 is engaged with the gear 57 of the rewind reel shaft 20, and the tape is quickly rewound. Depending on the height of the cam surface 2b, the recording/reproducing magnetic head 25 can pick up the tape recording signal and enter the review state, and when the review state is enabled and the fast rewind state is selected, the head The output circuit may be turned off with a switch.

Next, in the fast forward state, a long pulse current is applied to the trigger solenoid 68 to bring about the fast rewind state, and a short pulse current is applied to the solenoid 38 a little later. When the solenoid 38 is energized, the sliding member 8 is slid to the right,
As shown in FIG. 6, the drive gear 56 is an idler gear 58.
The rotation of the drive gear is caused by the rotation of the take-up reel shaft 19.
The rotation is transmitted to the gear 60 in the counterclockwise direction. The locking portion 9b of the lock pawl 9 provided on the sliding member 8 is locked with the engaging portion 4a of the assist plate 4, and even if the solenoid 38 is no longer energized, the sliding member 8
The sliding position of is maintained, and the drive gear 56 is meshed with the idler gear 58. Even in this state, the cam surface 2b of the head board 2 is struck by the stopper pin 23 of the head stopper 5, and the cam surface 2b
Depending on the height of the head, the tape can be brought into sliding contact with the recording/playback magnetic head, creating a queue state. As with the review, the head output circuit may be turned off with a switch when the fast-forward mode is selected by arranging a queue mode.

Once the tape recorder is configured as described above,
The meshing state of the drive gear and idler gear in the fast-forwarding state is maintained by the locking of the engaging part of the assist plate and the locking part of the sliding member. Conventionally, in the locked state held by the solenoid, the solenoid was continuously energized. This is not necessary, and it is possible to save power and reduce costs by downsizing electrical components such as power transformers.

Since the present invention is configured as described above, the meshing state of the drive gear in the fast-forwarding state is maintained by the engaging portion of the assist plate and the locking portion of the sliding member, and the solenoid can be energized with an instantaneous pulse current. Therefore, it is possible to provide a tape recorder that has excellent practical effects such as low current consumption, power saving, and miniaturization of electrical components.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a plan view showing a tape recorder, and Fig. 2 is a perspective view of the chassis showing the relationship among the assist gear, assist cam, assist plate, trigger arm, and trigger solenoid. FIG. 3 is an exploded perspective view of the mechanical parts, FIG. 4 is an explanatory diagram of the operation in the play state, and FIG.
FIG. 6 is an explanatory diagram of the operation in the fast rewind state, and FIG. 6 is an explanatory diagram of the operation in the fast forward state. 2...Head board, 4...Assist board, 4a...
...Engagement part, 7...Assist gear, 7a...Tooth part,
7b... Missing tooth part, 8... Sliding member, 9b... Locking part, 13... Capstan shaft, 19, 20... Reel shaft, 21... Spring, 36... Assist cam, 38... Solenoid , 47... Capstan gear, 56... Drive gear.

Claims (1)

[Scope of utility model registration request] A capstan gear provided on a capstan shaft driven by a motor, an assist gear having a tooth portion meshing with the capstan gear and a toothless portion provided on a part of the gear, and an assist gear integrally attached to the assist gear. An assist cam provided, an assist plate whose vertical sliding is controlled by the assist cam, a head board having a magnetic head connected to the assist plate via a spring, and a reel driven by the motor during high-speed running. a driving gear that drives the shaft; a sliding member that is slid by a solenoid that controls the swinging of the driving gear; and a locking part that is provided on the sliding member and that engages with the engaging part of the assist plate; By providing a prevention mechanism that prevents the head board from rising even if the assist plate rises during high-speed running operation, the high-speed running state in which the sliding member is slid by energization of the solenoid can be controlled. A tape recorder characterized in that the tape recorder is held by the assist plate in a raised position and the locking portion.