JPS5935103B2 - magnetic playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of changing the playback state from the playback operation state to cueing (tape fast forwarding with the magnetic head lightly touching the tape) and review (tape rewinding with the magnetic head lightly touching the tape). ) or pause (temporary stop with the magnetic head in pressure contact with the tape), or vice versa, with a single touch operation.

Hereinafter, the configuration of the present invention will be explained in detail based on illustrated embodiments.

In this embodiment, the present invention is applied to a cassette type tape recorder, and FIG. 1 is a plan view showing the mechanical part of the tape recorder.

In the figure, 1 is a base; 2 and 3 are a take-up reel shaft and a rewind reel shaft respectively mounted on the top surface of the board 1; 4 is a capstan shaft mounted on the top surface of the board 1; 3
, 4 are driven by a drive means (not shown) mounted on the back side of the base 1. Further, in the figure, reference numeral 5 denotes a magnetic head mounting plate mounted on the top surface of the board 1. This mounting plate 5 is guided by guide pins 6a and 6b fixed to the board 1, and can freely move forward and backward in the upward direction in the figure. It is urged downward in the drawing by springs Ta and Tb and is locked at the stop position. A recording/reproducing head 8 and an erasing head 9 are attached to the upper surface of the mounting plate 5. Furthermore, a pinch roll support arm 10 is mounted on the upper surface of the base 1 so as to be freely rotatable about a shaft 11, and a pinch roller 12 is supported at its rotation end. A deployment spring 13 is wound around the shaft 11, and each end of the spring 13 is elastically engaged with the inner surface of the front and rear side walls of the pinch roller support arm 10. In addition, the pinch roller support arm 10 has an engaging portion 10a formed by cutting and raising a portion of the rear side wall into a hook shape, and has an engaging portion 10a between the engaging portion 10a and one end of the spring 13, and one end of the rotating lever 14. A fixed pressing pin 14a is interposed. The rotating lever 14 is rotatably attached to a shaft 14b whose intermediate portion is fixed to the mounting plate 5, and is always biased clockwise by a deployment spring 14c wound around the shaft 14b. At the base end of each reel shaft 2, 3, there is a disc-shaped reel stand 2a,
3a is provided. In the figure, 15 is a brake plate as a braking means, and a guide groove 16 is provided in the center of the front part of this brake plate 15, and a shaft 17 fixed to the base 1 is inserted into this groove 16 as shown in the figure. It can move forward and backward in the vertical direction. The left and right arm portions 1 are normally biased upward in the drawing by a deployment spring 18 wound around the shaft 17.
5a, 15b are elastically pressed against each reel stand 3a, 3b. An interlocking plate 20 is mounted on the upper surface of the magnetic head mounting plate 5 at a position below the recording/reproducing head 8 and at a position in front of the other end of the rotary lever 14 so as to be able to move forward and backward in the vertical direction in the figure. has been done.

In the figure, 20a is a long hole provided in the interlocking plate 20, and 20b is a guide pin fixed to the mounting plate 5 and fitting into the long hole 20a to guide the interlocking plate 20 in the vertical direction in the figure. First and second electromagnetic plungers 21 and 22 constituting first and second operating means are mounted on the back surface of the base 1.

These plungers enable each movable core 21a, 22a to move vertically in the drawing, and draw the cores 21a, 22a downward in the drawing by energizing the coils. In addition, each movable iron core 21a, 22a has a drive pin 21b.
, 22b are fixed. First electromagnetic plunger 21
The drive pin 21b is connected to the shaft 1 on the back side of the base 1.
The first drive lever 21c is engaged with one end of the first drive lever 21c, which rotates about 7 as a fulcrum.

An engaging pin 23 is fixed to the lower surface of the magnetic head mounting plate 5, and this pin 23 is inserted through a long hole 24 formed in the base 1 to be long in the vertical direction as shown in the figure, and is inserted in front of the other end of the drive lever 21c. It is located. The tip of the drive pin 22b of the second electromagnetic plunger 22 is inserted through a long hole 25 provided in the base 1, and is fixed to the center of the back surface of the brake plate 15 on the upper surface side of the base 1.

Further, the drive pin 22b is connected to the base 1 on the back side of the base 1.
The second drive lever 22c is engaged with one end of a second drive lever 22c that rotates about a shaft 26 fixed to the shaft 26 as a fulcrum. Second drive lever 2
An engagement pin 27 is fixed to the other end of 2c, and this pin 27
protrudes to the upper surface side of the mounting plate 5 through a through hole 28 provided in the base 1 and a through hole 29 provided in the magnetic head mounting plate 5. Further, the through hole 29 of the mounting plate 5 has a triangular locking protrusion 30 projecting from the left edge in the drawing. and the locking pin 2
7 is off the track of the protrusion 30 at all times, but when the drive lever 22c is rotated counterclockwise in the drawing by energizing the second electromagnetic plunger 22, it moves onto the track of the protrusion 30 and is magnetically moved. The amount of movement of the head mounting plate 5 is restricted. In the figure, reference numeral 31 indicates the magnetic tape in the force set loaded on both reel shafts 2 and 3.

Next, the operation of this tape recorder will be explained based on FIGS. 2 to 4.

FIG. 2 shows the pause state.

That is, in the stopped state shown in FIG.
When the electromagnetic plunger 21 is energized and the movable iron core 21a is pulled downward in the figure (direction A), the first
The drive lever 21c rotates counterclockwise about the shaft 17 as a fulcrum. As a result, the drive lever 21c is moved by the engagement pin 23.
Press to move the magnetic head mounting plate 5 in the upward direction (B direction).
The magnetic heads 8 and 9 are brought into contact with the magnetic tape 31. Further, the pressing pin 14a of the rotating lever 14 mounted on the mounting plate 5 presses one end of the deployment spring 13 to push the rotating end of the pinch arm 10 forward, moving the pinch roller 12 to a position near the capstan shaft 4. Move up to.
In this case, the pinch roller 12 does not come into contact with the capstan shaft 4, and both reel shafts 2 and 3 are prohibited from rotating by the brake plate 15, so the magnetic tape 31 does not run and is in a so-called pause state. There is. FIG. 3 shows the recording or playback operating state.

That is, in the pose state shown in FIG. 2, when the second electromagnetic plunger 22 is further energized and the movable iron core 22a is pulled downward in the figure (direction c), the drive pin 22b moves against the brake plate 15.
from both reel stands 2a, 3a, and both reel shafts 2, 3.
The interlocking plate 20 is released from the rotation prohibited state.
is pushed back by the brake plate 15, the rotation lever 14 is pushed counterclockwise with the rear end of the interlocking plate 20, and the deployment spring 13 is pressed by the pressing pin 14a provided on the rotation lever 14. Push the pinch arm 10 further beyond the position shown in FIG.
are brought into pressure contact by the elastic force of the spring 13. Furthermore, due to the movement of the movable iron core 22a in the c direction, the drive pin 22b
rotates the second drive lever 22c counterclockwise about the shaft 26, and moves the locking pin 27 provided on the drive lever 22c to the left in the figure. In this state, when the capstan shaft 4 and the reel shaft 2 on the winding side are driven to rotate,
The tape 31 is wound onto a tape reel on the winding side at a constant speed set by the capstan shaft 4, and enters a recording or reproducing operation state. FIG. 4 shows the operating state of the queue or review.

In other words, in the recording or playback operation state shown in FIG.
When the electromagnetic plunger 21 is de-energized, the movable iron core 21a of the plunger 21 and the first drive lever 21c
returns to the position shown in Figure 1. Therefore, the magnetic head mounting plate 5
is released from the pressure by the first drive lever 21c and moves downward in the drawing due to the restoring force of the springs 7A and 7b, but the locking protrusion 30 formed on the mounting plate 5 engages the locking pin 2.
It stops when it touches 7. In this state, the magnetic heads 8 and 9 are in light contact with the magnetic tape 31, and the pinch roller 12 is held at a position slightly apart from the capstan shaft 4 by the pressing pin 14. Therefore, when the reel shaft 2 on the take-up side is rotated in the state shown in FIG. 4, it enters a so-called operating state, and the tape 31 is wound at high speed on the table reel on the take-up side with the recording/playback head 8 in light contact. It will be taken away. Furthermore, when the reel shaft 3 on the rewinding side is rotated in the state shown in FIG.
1 is rewound at high speed onto the tape reel on the rewinding side with the recording/reproducing head 8 in light contact with the tape. As mentioned above,
According to this tape recorder, by sequentially energizing the first and second electromagnetic plungers 21 and 22, the recording or reproducing operation state shown in FIG. 3 is achieved, and in this state, the first electromagnetic plunger 21 is energized. When it is stopped, it enters the queue or review operating state shown in FIG. Furthermore, if the power supply to the second electromagnetic plunger 21 is stopped in the state shown in FIG. 3, the pause state shown in FIG. 2 is achieved. Furthermore, the first electromagnetic plunger 21 is energized in the operating state of the key or review shown in FIG.
Alternatively, if the second electromagnetic plunger 22 is energized in the pause state shown in FIG. 2, the state is switched to the recording or reproducing operation state shown in FIG. 3. Therefore, once the recording or playback mode is set, the operation can be switched from the record or playback mode to the recorder or reviewer mode by selectively energizing the first electromagnetic plunger 21. Or the opposite can be switched with a single touch. For example, if you are playing a particular song recorded on the magnetic tape 31 and you want to listen to that song from the beginning, you can switch the first electromagnetic plunger 21. When the rewind side reel shaft 3 is rotated and the tape 31 has been rewound by a predetermined amount, the first electromagnetic plunger 21 is energized again to reproduce the song from the beginning.

Also, if you want to quickly finish the song you are currently listening to and listen to the next song, stop energizing the first electromagnetic plunger 21, rotate the take-up reel shaft 2, and place the tape 31 in place. After winding at a constant high speed, the first electromagnetic plunger 21 is energized again to start playing the next song.
Further, once the recording or playback operation state is set, the second electromagnetic plunger 22 is selectively energized to switch from the recording or playback operation state to the pause state, or vice versa. For example, if you are listening to what is recorded on the tape 27 while writing or typing it in the playback mode, you can easily pause the tape 27 at appropriate times and play it back little by little at the same speed as your writing or typing speed. can.

Note that the present invention is not limited to the illustrated embodiment and can be modified in various ways.

For example, in the embodiment, electromagnetic plungers 21 and 22 are used as the first and second operating means, and it is possible to release the braking state of the reel shafts 2 and 3 or move the magnetic head mounting plate 5 by simply operating a switch. However, it is also possible to adopt a mechanical operation state and operate the button by pressing it. The present invention can also be applied to playback-only machines that cannot perform recording operations. As detailed above, according to the present invention, it is possible to provide a magnetic reproducing device that can switch from a reproducing operation state to a read, review, or pause state, or vice versa, with a single touch operation. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing a force-set tape recorder in a stopped state, and FIG. 2 is a plan view showing the positional relationship of the main parts of the tape recorder in a paused state. , FIG. 3 is a plan view showing the positional relationship of the main parts of the same tape recorder in the recording or playback operating state, and FIG. 4 is a plan view showing the positional relationship of the main parts of the same tape recorder in the recording or reproducing operating state. It is. 1... Base, 2, 3... Reel shaft, 4
... Capstan shaft, 5 ... Magnetic head mounting plate, 8 ... Recording and playback head, 12 ...
Pinch roller, 15... Brake plate (braking means), 21... First electromagnetic plunger (first operating means), 22... Second Electromagnetic plunger (second operating means).

Claims (1)

[Scope of Claims] 1. A reel shaft, a magnetic head mounting plate, a capstan shaft, and a pinch roller that moves toward and away from the capstan shaft in relation to the forward and backward movement of the magnetic head mounting plate are mounted on a substrate,
In a magnetic reproducing device that moves a magnetic head mounting plate forward and backward to switch from a stopped state to a reproducing operating state, or vice versa, the pinch roller is moved at the same time as the magnetic head mounting plate is moved from a stopping position to a reproducing operating position. a first operating means for moving the capstan to a position near the capstan shaft;
A braking means for prohibiting the rotation of the reel shaft, and at the same time, the pinch roller is moved from a position near the capstan shaft to a position in pressure contact with the capstan shaft, and the pinch roller is moved from a position near the capstan shaft to a position where it is in pressure contact with the capstan shaft. When the magnetic head mounting plate that has been moved to returns from the playback operation position toward the stop position due to deactivation of the first operating means, the return movement is blocked at an intermediate position, and the magnetic head is moved to the tape position. A magnetic reproducing device comprising: a second operating means that is locked at a position where it lightly contacts the magnetic reproducing device. 2. The magnetic reproducing device according to claim 1, wherein at least the second operating means is an electromagnetic plunger.