JPS5842536B2 - Jikiki Rokusai Seisouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a magnetic recording/reproducing device.

Conventional magnetic recording and reproducing devices use a manual operation button to press or release the idler from the reel shaft and flywheel, etc. to obtain recording/reproduction, fast forwarding, and rewinding states, and a control lever to press or release the idler from the reel shaft and flywheel. By moving the pinch roller, etc., you can obtain recording/playback, fast-forwarding, and rewinding status.

Since several solenoid plungers are used in the locations of these operation buttons, the mechanism is extremely complex, with many rotating and sliding levers.

It had a large number of parts, was large, and was expensive.

Therefore, the purpose of this invention is to have a simple mechanism.

It is an object of the present invention to provide a compact and inexpensive magnetic recording and reproducing device with a small number of parts and moving parts.

In summary, the magnetic recording and reproducing apparatus of the present invention is as follows.

A one-way clutch and a slip clutch are respectively provided on the reel shaft driven by the motor at high speed or low speed, and the motor is switched between high speed and low speed by a changeover switch that is changed in response to the contact/separation movement of the capstan and the pinch roller. Fast forwarding of magnetic tape running,
This is an attempt to obtain rewind and replay states using a simple mechanism.

FIG. 1 is a block diagram of an embodiment of the magnetic recording and reproducing apparatus of the present invention, that is, a magnetic recording and reproducing apparatus.

In the figure, a belt 3 is looped around a pulley 2 of a motor 1 that rotates in high-speed/low-speed normal rotation and high-speed reverse rotation.

This belt 3 also runs over the reel shaft pulleys 6.1 and the flywheel 8 of the two reel shafts 4, 5, respectively.

Therefore, when the motor 1 is rotating, the reel shaft pulley 6, γ, flywheel 8, and capstan 9 always rotate.

A cartridge 10 containing a plurality of tracks of magnetic tape is attached to the reel shafts 4 and 5.

Magnetic head 11, erasing head 12 and pinch roller 1
3 is attached to the head mounting board 14 in order to bring it into contact with and separate from the magnetic tape (not shown) of the cartridge 10 to put it into a recording/playback state or a stop state.

The head mounting board 14 rotates around a fulcrum pin 16 fixed to the chassis 15, and moves the magnetic head 11, erasing head 12, and pinch roller 13 to the position indicated by the dotted line.

As shown in FIG. 2, when the magnetic tape 10a of the cartridge 10 is wound to one side, the magnetic tape end detection bin 17 overcomes the return force 18 by the tension of the magnetic tape 10a and reverses the end detection switch 19. let

Referring again to FIG. 1, the head mounting board 14 is designed to rotate by a certain angle.

A toggle spring 20 acts between the end portion and the chassis 15 to moderate the rotational movement.

The high-speed/low-speed changeover switch 21S is driven by the head mounting board 14 to turn on and off, thereby switching the motor 1 between high-speed and low-speed rotation.

The reel shafts 4, 5 are as shown in the sectional view of FIG.

That is, the reel center shafts 21 and 22 are fixed to the chassis 15 by the holding metals 23 and 24, and the center shafts 21 and 22 are
Reel shafts 4 and 5 are rotatably supported by 22.

Pads 25.2 are provided on the collars 4a and 5a of the reel shafts 4 and 5.
6, and the reel stands 27, 2B are in contact with the pads 25, 26 by springs 29.30.

For this reason, the reel stand 2γ. 28 and pads 25 and 26 constitute a slip clutch that slips when a constant torque is applied.

This slip clutch consists of a cartridge 1 shown in FIG.
It operates when the magnetic tape 10a in 0 has completed winding and reached the end, thereby preventing the magnetic tape 10a from being cut.

Referring again to FIG. 3, the narrow diameter portion 2 of the reel stand 2γ, 28
γa and 28a constitute a one-way clutch inside the pulleys 6 and 7 together with the disk rollers 31 and 32.

The structure of this one-way clutch is shown in FIGS. 4 and 5.

That is, the narrow diameter portions 27a, 28a of the reel stand 27.28
There are several disc rollers 31 and 32 between the reel pulley 6.7 and the reel pulley 6.7.
Reel pulley 6.7 and narrow diameter portion 27 of reel stand 27.28
The oblique side 6atγa is formed such that the gap with a, 28a is smaller than the diameter of the disk rollers 31, 32, and the gap 5b, 7b is larger than the diameter of the disk rollers 31, 32.

Also. Elastic parts 6c and 7c are integrally formed on the reel pulleys 6 and γ, which push the single disc rollers 31 and 32 in a direction where the gap becomes smaller, and are firmly in contact with the oblique sides 6a and 7a.

here. When the narrow diameter portions 2γa and 28a of the reel stands 27 and 2B are rotated in the direction of arrow X, one disc roller 31 and 32 are rotated.
The small diameter parts 27a, 28a of the reel stand 27a, 28a and the oblique side 5a, γa of the reel pulley 6.1 are embedded, and the small diameter parts 27a, 28a of the reel stand 27, 2B, the reel pulley 6, γ, the disk roller 31,
32 rotates as a unit.

Even if the reel balls IJ6 and 7 are rotated in the direction of the arrow Y, the result is the same.

Next, when the reel stand narrow diameter parts 27a and 28a are rotated in the direction opposite to the arrow
, γc(D')l- The gaps 6b, 7 are large by overcoming the
b, slipping and not transmitting rotational force.

In this way, a one-way clutch is formed.

In addition, in order to reverse the direction in which the rotation of the one-way clutch is restricted, the disk rollers 31 and 32 may be replaced with the portions shown by dotted lines.

In this way, the rotation restriction direction can be changed simply by replacing the disc rollers 31 and 32 during assembly.

Here, belt 3 is attached to two reel boots IJ 6 and 7.

When reel shaft 4 rotates, reel shaft 5 stops (idling)
If the rotation restriction direction of the one-way rotation clutch is determined so that the reel shaft 4 stops (idles) when the reel shaft 5 rotates.

The rotation of the reel shafts 4 and 5 is switched depending on the direction of rotation of the motor 1, ie, normal rotation or reverse rotation.

In other words. In the case of a cassette deck, etc., if the motor 1 is rotated counterclockwise so as to transmit the rotational force of the motor 1 to the reel shaft 5 in FIG. 1, the capstan 9 and the reel shaft 5 will be rotated counterclockwise. recording/playback and fast-forwarding status.

At this time, no rotational force is transmitted to the reel shaft 4, and the reel shaft 4 rotates counterclockwise due to the tensile force of the magnetic tape 10a (FIG. 2).

Next, if motor 1 is reversed and rotated clockwise,
The reel shaft 4 is rotated clockwise by the rotational force, and the reel shaft 5 is rotated clockwise by the magnetic tape 10a.

At this time, the capstan 9 also rotates clockwise.

The rotation of the reel shaft 4 is transmitted to the pulley 34 of the counter 33 by a belt 35.

The counter 33 has a counter display wheel 36 as shown in FIG.
, 37 are provided for the number of digits in the display number.

The counter display wheels 36 and 37 have counter gears 36a and 3.
7a, and when the display wheel 31 rotates once due to the action of the feed gear 3B, the display wheel 36 rotates by 1/10.

In this embodiment, the counter 33 has three digits, so O~9
The display will display up to 99 and then change from 999 to 0.

Here, the side plate 39 of the counter 33 has contacts 39a, 3
9b is formed as shown in FIG. ing.

Also, contacts 41a and 41b are provided on the side plate 41 of the counter 33.
is formed as shown in Fig. 78, and a contact spring (counter switch) 42 is in contact with this to form a normally open switch, and when the counter 33 reaches 000, the contacts 41a and 41b are turned on. ing.

Referring again to FIG. 1, an erroneous recording prevention switch 43 is provided in conjunction with the cartridge 10.

As shown in FIG. 2, the cartridge 10 has recording prevention protrusions 10b and 10c.

The erroneous recording prevention switch 43 is turned on or off depending on the presence or absence of 10C.

Next, with reference to FIGS. 1, 8, 9, and 10, the magnetic head 11. The operations of the erasing head 12 and the pinch roller 13 will be explained.

The pinch roller 13 is attached to a holding lever 44 as shown in FIG.
It is rotatably held at , rotates about a fulcrum 45 , and is biased by an upper liquid spring 46 .

The head mounting board 14 is provided with a hole 4γ.
The head mounting board 14 is moved by the switching bin 48 that enters the first position.

The flywheel 8 is provided with drive bins 8a and sb.

A switching lever 50 is rotatably supported by a fulcrum pin 49 provided on the chassis 15, and a vertical lever 51 is supported at the tip of the lever 50 by a hinge 52 so as to be rotatable in the vertical direction.

A spring 53 acts on the switching lever 50 and the up/down lever 51, so that the up/down lever 51 is always pulled downward.

However, the vertical lever 51 has a protrusion 51a, which hits the slide lever 54 and is prevented from moving downward.

In this case, the slide bin 5 fixed to the switching lever 50
0a is engaged with a notch 54a of the slide lever 54.

The slide lever 54 is connected to a solenoid plunger 55 by a pin 56, and when the solenoid plunger 55 is energized, the slide lever 54 is pulled to the right in FIG. 51a enters and the vertical lever 51 moves downward.

When the power to the plunger 55 is cut off, the slide lever 54 is moved to the left in FIG. 9 by the spring 5γ.
The protrusion 51a of the vertical lever 51 is pushed down by the cut and raised oblique side 54C of the slide lever 54.

The tip of the vertical lever 51 faces upward.

in this case. When the vertical lever 51 is lowered, it comes into contact with the drive bins 8 a t 8 b of the flywheel 8 .

Here, the switching lever 50 is operated by a spring 59 applied to a support pin 58 fixed to the chassis 15.

It rotates around the fulcrum pin 49.

That is, as shown in FIG. 10, the switching lever 50 moves between the stoppers 60 and 61 of the chassis 15.

The solenoid plunger 55 is energized and the slide lever 5
4, the protrusion 51a of the vertical lever 51 enters the notch 54b, the tip of the vertical lever 51 goes down, the tip of the vertical lever 51 hits the drive bin 8b of the flywheel 8, and the flywheel 8 is moved. Since the drive bin 8b rotates due to the rotation, the up and down lever 51 is switched to the switching lever 5.
0, it overcomes the spring 59 and moves to the position of consciousness shown in FIG.

Here, since the switching lever 50 is configured to rotate the head mounting board 14 while the switching bin 4B is fixed, the head mounting board 14 moves and attaches the magnetic head 11 and erasing head 12 to the magnetic tape 10a of the cartridge 10. The pinch roller 13 comes into contact with the recording/playback state.

Since the solenoid plunger 55 is energized for a short time, the slide lever 54 is pushed back by the spring 5T, and the tip of the vertical lever 51 is raised by the oblique side 54c.

The magnetic head 11 does not hit the drive pin 8 a t a b of the flywheel 8 again, and the magnetic head 11 maintains the recording/reproducing position.

Next, when the solenoid plunger 55 is energized again, the tip of the up-down lever 51 moves downward in the same motion, and the up-down lever 51 hits the drive bin 8a of the flywheel 8, causing the switching lever 50 to move in the direction of the solid line in FIG. rotates, the switching pin 43 rotates the head mounting board 14, and positions the magnetic head 11.degree. erase head 12 and pinch roller 13 in a stopped state.

That is, each time the solenoid plunger 55 is energized, the recording/playback state and the stop state are alternately switched.

Next, the operation will be explained with reference to the circuit diagram of the operating circuit shown in FIG.

When the play button (not shown) is pressed, the play switch 6
2 is turned on instantaneously, the solenoid plunger 55 is energized, and the vertical lever 51 moves downward as described above.

When the head mounting board 14 is in a stopped state, the high speed/low speed selector switch 21S is connected to the b side (high speed side), but when the play switch 62 is turned on, the diode 63
Current flows through the motor 1 to the low speed terminal of the motor 1.
rotates at low speed.

The flywheel 8 is rotated by the rotational force of the motor 1, and the drive bin 8b and the vertical lever 51 come into contact with each other, and the head mounting board 14 is rotated.
rotate the magnetic head 11. The erasing head 12 and pinch roller 13 are brought into contact with the magnetic tape 10a to create a recording/playback state.

As a result, the high-speed/low-speed selector switch 21S is switched to the a side, and electrostriction is supplied to the low-speed terminal of the motor 1, causing recording and
The playback state is retained.

In this case, the power supply to the solenoid plunger 55 is cut off by the action of the diode 63.

Next, when a stop button (not shown) is pressed, the stop switch 64b is turned on instantly, and the solenoid plunger 55
The solenoid plunger 55 operates by supplying power to the solenoid plunger 55 .

As a result, the vertical lever 51 moves downward and hits the drive pin 8a of the flywheel 8 to rotate the head mounting board 14 and bring it to a stopped state.

As a result, the high speed/low speed selector switch 21S is switched to the b side, and the motor 1 is stopped.

Note that even if the stop switch 64b is not turned on, when the magnetic tape 10a reaches the end, the tape end detection switch 19b is turned on, and the recording/playback state is changed to the stop state in the same way as when the stop button is pressed.

Furthermore, turning on the play switch 62 again in the recording/playback state can also bring the device to a stop state.

Next, the play memory operation will be explained.

That is, before rewinding, press the reset button 33a of the counter 33 (FIG. 1) to set the counter display to OOO, then turn on the rewind switch 65, rewind to a certain point, and then turn on the play memory switch 66. If you play or record while in play mode,
When the counter 33 reaches OOO, the counter switch 4
2 is turned on, and the solenoid plunger 55 operates in the same way as when the stop switch 64b is turned on, and recording/recording is started.
The state changes from the play state to the stop state.

Next, the fast forward operation will be explained.

In the stopped state, the high speed/low speed changeover switch 21S is set to b.
side (high speed side), press the fast forward button (not shown) and instantaneously turn on the fast forward switch 67.

A positive voltage is applied to the high-speed terminal H of the motor 1, and the motor 1 rotates forward at high speed in the counterclockwise direction in FIG.
and rotate the capstan 9 counterclockwise.

At the same time, the relay 68 is turned on and the contact 69 of the relay 68 is turned on.
enters the b side, and the relay 68 holds itself.

In this self-holding circuit, a normally closed switch 64a interlocked with the stop switch 64b, a tape end detection switch 19a, and a counter switch 40 are connected in series, and the fast-forward state is maintained by turning on the fast-forward switch 61 only once.

When the stop button is pressed and the switch 64a is turned off, and when the tape end detection switch 19a is turned off,
Alternatively, when the counter 33 displays 000 and the counter switch 40 is turned off, the self-holding of the relay 68 is released and the motor 1 is stopped.

Note that the switch TO connected in parallel with the counter switch 40 is a fast forward or rewind memory switch, and when it is turned off when memorizing, the counter switch 40 releases the self-holding of the relay 68 and stops the motor 1. It is for the purpose of

Next, the case of one rewind will be explained.

When the rewind switch 65 is momentarily turned on by pressing the rewind button (not shown), the relay 71 is operated and its contacts 12. γ3 and 74 enter the b side, electrostriction is also applied to the relay 68 via the contact 14, and the relay 68 self-holds as in the case of fast forwarding.

As a result, contact point 69. A positive voltage is supplied to the inverting terminal H of the motor 1 via γ3, and a negative electrostriction is supplied to the high-speed terminal H via the contact T2, so the motor 1 is inverted at high speed and the first
It rotates clockwise in the figure, and rewinds by rotating the reel shaft 4 clockwise.

Canceling the rewind state is performed in the same way as canceling the fast forward state.

FIG. 12 is an overall block diagram of the magnetic recording and reproducing apparatus shown in FIG. 1.

That is, the magnetic head 11 and the erase head 12 are connected to an equalizer circuit 75, the output signal of which is amplified by a low frequency amplification circuit γ6 and supplied to a speaker 77.

The equalizer circuit T5 and the low frequency amplifier circuit T6 are driven by being supplied with power from the power supply circuit γ8.

An operation circuit T9 for performing operations such as recording/playback, stop, fast forward, one rewind, etc. is also driven by the power supply circuit γ8.

A specific circuit diagram of this operating circuit 79 is shown in FIG.

Thus, according to the embodiment, the reel shaft pulleys 6 and 7 are provided on each of the reel shafts 4 and 5 driven by the motor 1.
A one-way clutch and reel stand 2γ, 28. which is composed of reel stands 27, 28, disc rollers 31, etc. Pads 25, 26. Reel axis 4.5. A slip clutch composed of springs 29, 30, etc. is provided to connect the reel shaft 4,
5, as well as the capstan 9 and the pinch roller 13.
The motor 1 is switched between high speed and low speed by the changeover switch 21S, which is switched by the contact/separation drive mechanism that moves the motor 1 toward and away from the motor.The mechanism can be switched simply by electrical operation, and fast forwarding, rewinding, or reproducing states can be achieved with a simple mechanism. be able to.

Further, since the magnetic head 11 and the reproducing head 12 are moved together with the pinch roller 13, the configuration is further simplified.

However, it goes without saying that the movement of the magnetic head 11 and the reproducing head 12 may be controlled separately from the pinch roller 13.

In addition, by turning on the play switch 62 momentarily,
Power is supplied to the low speed terminal of the motor 1 via the diode 63, and at the same time, power is supplied to the solenoid plunger 55.

Therefore, the high speed/low speed selector switch 21S is set to the low speed side (a
side), the power supply to the solenoid plunger 55 is automatically cut off.

As described above, the magnetic recording and reproducing device of the present invention includes two capsuns, a pair of reel shafts, a motor that rotates the reel shafts at high or low speed, and a magnetic tape that is wound by the rotation of the reel shafts. a pinch roller for directly contacting the magnetic tape with the capstan; a drive mechanism that drives the pinch roller toward and away from the capstan; and a drive mechanism that rotates the motor at low or high speed in response to the movement of the pinch roller toward and away from the capstan. With a changeover switch to change the state.

A one-way clutch and a slip clutch are provided corresponding to the respective reel shafts to transmit the rotational force of the motor to the pair of reel shafts.

Since the one-way clutch is provided to operate in mutually opposite rotational directions, the mechanism related to reel track drive is very simple, the number of parts and moving parts can be reduced, and it is small. It is cheap.

What's more, the tape is rapidly forwarded by switching the motor between high and low speeds using a selector switch that responds to the movement of the capstan and pinch roller toward and away from each other.

A complicated mechanism such as an idler lever is not required in order to rewind or regenerate the state, and the mechanism is simple and has a small number of parts and moving parts, making it possible to downsize and reduce costs.

In addition, it is easy to operate and is effective as a remote control.
Operation lever.

Since there are few idlers, the operation is stable and no wow or flutter occurs.

Furthermore, since the operating section can be configured at a desired location on the recording/reproducing device, the degree of freedom in design increases.

Furthermore, since power is supplied to the electromagnetic drive mechanism for a short time, power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is an explanatory diagram of the cartridge, FIG. 3 is a sectional view of the reel shaft, and FIGS. 4 and 5 are respectively An explanatory diagram of FIG. 3, FIG. 6 is a configuration diagram of the counter in FIG. 1, FIGS. 1A and 1B are configuration diagrams of the counter switch, respectively, and FIG. The perspective view, FIG. 9, and FIG. 10 are respective operation explanatory diagrams. FIG. 11 is a circuit diagram of the operating circuit of the device shown in FIG. 1, and FIG. 12 is a block diagram of the entire circuit of the device shown in FIG. 1... Motor, 4, 5... Reel shaft, 6, 7...
Reel shaft pulley, 8... Flywheel, 9... Capstan, 13... Pinch roller, 14... Head mounting board. 21S...High speed/low speed selector switch, 25, 26...
・Pad, 27, 2B... Reel stand, 31, 32...
・Disc roller, 55...Solenoid plunger.

Claims (1)

[Claims] 1. A capstan, a pair of reel shafts, and a motor that rotates the reel shafts at high or low speed. A magnetic tape wound by rotation of the reel shaft, a pinch roller for pressing the magnetic tape against the capstan, a drive mechanism for driving the pinch roller toward and away from the capstan, and a contact roller for the pinch roller. a changeover switch that switches the motor to a low speed or high speed rotation state in response to a release operation; a one-way clutch provided corresponding to each reel shaft to transmit the rotational force of the motor to the pair of reel shafts; Equipped with a slip clutch
A magnetic recording/reproducing device in which the one-way clutches are provided so as to operate in mutually opposite rotational directions. 2. The magnetic recording and reproducing device according to claim 1, wherein the motor is configured to be capable of forward and reverse rotation, and the pair of reel shafts are driven to rotate forward or reverse through the one-way clutch and the slip clutch, respectively. Device.