JPS5938659B2 - magnetic playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables cueing (tape fast forwarding with the magnetic head lightly touching the tape) or review (tape rewinding with the magnetic head lightly touching the tape) from the playback operation state. ) The present invention relates to a magnetic reproducing device that can switch the operation to the operating state or vice versa with a one-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, and 4 is a capstan shaft mounted on the top surface of the board 1. ,
4 is 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 vertical direction in the figure. It is urged downward in the drawing by springs 7a 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 roller 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 gate 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 wall into a hook shape, and a pressing shaft fixed to the mounting plate 5 between the engaging portion 10a and one end of the spring 13. 14 is interposed. Each of the reel stands 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 15a are normally biased upward in the drawing by a deployment spring 18 wound around the shaft 17.
, 15b are elastically pressed against each reel stand 3a, 3b. The amount of downward movement of the brake plate 15 in the downward direction in the drawing is limited by a stopper 19 fixed to the base 1. Furthermore, 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 21, 22 are connected to each movable core 21a,
21b is movable downward in the figure, and the iron cores 21a and 22a are pulled in the downward direction in the figure by energizing the coils. Furthermore, drive pins 21b and 22b are fixed to each movable core 21a and 22a. 10th) The drive pin 21b of the electromagnetic plunger 21 is connected to the first drive lever 2 which rotates about the shaft 17 on the back side of the base 1.
It is engaged with one end of 1c.

An engagement pin 23 is fixed to the lower surface of the magnetic head mounting plate 5. This pin 23 is inserted through a long hole 24 formed in the base 1 to be elongated 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
A locking 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 normally out of the orbit of the protrusion 30, but when the second electromagnetic plunger 22 is energized, the drive lever 22c
When it rotates counterclockwise in the drawing, it moves onto the orbit of the protrusion 30 and limits the amount of movement of the magnetic head mounting plate 5. 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 and 3.

Note that FIG. 2 shows the operating state when the first and second electromagnetic plungers 21 and 22 are sequentially energized in the stopped state of FIG. 1, and FIG.
This shows the operating state when power to the electromagnetic plunger 21 is stopped. First, in the stopped state of FIG. 1, when the first electromagnetic plunger 21 is energized and the movable iron core 21a is pulled downward in the figure (direction A), the first drive lever 21c is moved around the shaft 17 by the five drive pins 21b. rotates counterclockwise.

As a result, the driving pin 21c presses the engagement pin 23 and pushes the magnetic head mounting plate 5 upward in the drawing (direction B).
While the magnetic heads 8 and 9 are brought into contact with the magnetic tape 31, the pressing shaft 14 fixed to the mounting plate 5 presses the deployment spring 13 to rotate the pinch roller support arm 10, and the pinch roller 12 is pressed against the capstan shaft 4. let Next, when the second electromagnetic plunger 22 is energized and the movable iron core 22a is pulled downward in the drawing (direction C), the drive pin 22b pulls the brake plate 15 away from both reel stands 2a and 3a, and at the same time the second electromagnetic plunger 22 The drive lever 22c is rotated counterclockwise about the shaft 26, and the locking pin 27 provided on the drive lever 22c is moved to the left in the figure (see FIG. 2). In this state, when the capstan shaft 4 and the reel shaft 2 on the take-up side are rotated, the tape 31 is wound onto the tape reel on the take-up side at a constant speed set by the capstan shaft 4, and is used for recording or playback. It becomes operational. Next, when the power supply to the first electromagnetic plunger 21 is stopped in the state shown in FIG. 2, the movable iron core 21a of the plunger 21 and the first drive lever 21c return to the position shown in FIG.

Therefore, the magnetic head mounting plate 5 is connected to the first drive lever 21c.
The pressure is released and the springs 7A and 7b move in the direction shown in the figure due to the restoring force, but they stop when the locking protrusion 30 formed on the mounting plate 5 comes into contact with the locking pin 27. In this state, the magnetic heads 8, 9 lightly contact the magnetic tape 31, and the pinch roller 12 is slightly pulled away from the capstan shaft 4 by the pressing pin 14 (see FIG. 3). Therefore, when the reel shaft 2 on the take-up side is rotated and driven in the state shown in FIG. It is wound up at high speed.
Furthermore, when the rewind side reel shaft 3 is rotated once in the state shown in FIG. It's being rewound. In addition, the valve shown in FIG. 3 also has the first electromagnetic plunger 2 in the operating state
1 is energized again, the rotation of the first drive lever 21c causes the magnetic head mounting plate 5 to move upward in the drawing, thereby switching to the recording or reproducing operation state. As described above, according to this tape recorder, the first and second electromagnetic plungers 21,
By sequentially energizing the first electromagnetic plunger 22, it enters the recording or playback state, and if the first electromagnetic plunger 21 is de-energized in this state, the first electromagnetic plunger 21 switches to the recording or reproducing state, and the first electromagnetic plunger 21 is activated again. When energized, the device switches to recording or playback mode.

Therefore, once the recording or playback mode is activated, the first
By selectively energizing the electromagnetic plunger 21, the operation can be switched from the recording or playback operating state to the recording or reviewing operating state, or vice versa, with a single touch operation. For example, if you want to listen to a particular song recorded on the magnetic tape 31 from the beginning while it is being played back, the power to the first electromagnetic plunger 21 is stopped and the rewind side reel shaft 3 is turned off. After rotating and rewinding the tape 31 by a predetermined amount, the first electromagnetic plunger 21 is energized again to play the song from the beginning.

In addition, if you want to quickly finish the song you are currently listening to and listen to the next song, the first electromagnetic plunger 21 is de-energized, the take-up reel shaft 2 is rotated, and the tape 31 is placed in place. After winding at a constant high speed, the first electromagnetic plunger 21 is energized again to start playing the next song.
Note that the present invention is not limited to the illustrated embodiment and can be modified in various ways.

For example, in the embodiment, the first and second operating means are electromagnetic plungers 21 and 22, and it is possible to release the braking state on the reel shaft or move the magnetic head mounting plate 5 by simply operating a switch. , it is also possible to employ mechanical operating means. The present invention can also be applied to playback-only machines that cannot perform recording operations. As described in detail above, according to the present invention, it is possible to provide a magnetic reproducing device that can switch the operation from the reproducing operation state to the copy or review operation state, or vice versa, with a single touch operation. can.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view showing a force-setting type tape recorder in a stopped state, and FIG. 2 shows the positional relationship of the main parts of the same tape recorder in a recording or playback operating state. FIG. 3 is a plan view showing the positional relationship of the main components of the same tape recorder in the recorder or reviewer operating state. 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 (control means), 21 ... First electromagnetic plunger, 2
2...Second electromagnetic plunger, 21c...
...First drive lever, 22c...Second drive lever 27...Locking pin, 30...
Locking protrusion, 31...Magnetic tape.

Claims (1)

[Claims] 1. A reel shaft and a magnetic head mounting plate are mounted on a substrate,
In a magnetic reproducing apparatus that moves a magnetic head mounting plate forward and backward to switch from a stopped state to a reproducing operating state or vice versa, a first method for moving the magnetic head mounting plate forward from a stopping position to a reproducing operating position is used. an operating means, a braking means for preventing rotation of the reel shaft, and a second brake means for activating the braking means to release the braking state on the reel shaft.
an operating means, a locked part provided on a magnetic head mounting plate, and a locking part rotatably attached to the substrate, and moved onto the orbit of the locked part by actuation of the second operating means. When the magnetic head mounting plate, which has been moved to the playback operation position, returns to the stop position from the playback operation position by releasing the operation of the first operation means, the magnetic head mounting plate locks with the center of rotation thereof. The locking part is locked to the locked part with the direction of the straight line connecting the parts substantially aligned with the orbital direction of the locked part, and the mounting plate is placed at a position where the magnetic head lightly contacts the tape. a movable member that is held in position, and a movable member that is interlocked with the forward and backward movement of the magnetic head mounting plate, and is in pressure contact with the capstan shaft when the head mounting plate is in the playback operation position, and the head mounting plate is latched to the second operating means. 1. A magnetic reproducing device comprising a pinch roller that is held in a position near a capstan shaft when the magnetic reproducing device is held in a position in the middle of returning. 2. The magnetic reproducing device according to claim 1, wherein at least the second operating means is an electromagnetic plunger.