JPH0754594B2 - Magnetic recording / playback mode conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for performing mode switching of a magnetic recording / reproducing apparatus via a push button switch.

It is well known that a manual push button switch is the best means for changing the mode of a magnetic recording / reproducing apparatus. However, since the command from the push-button switch is only an electric signal, a member for converting the electric signal into a mechanical output is required to move the support table on which the reproducing member such as a magnetic head serving as a load is placed. For this reason, a plurality of electromagnetic plungers were used, but they are not currently used because they generate large power and shock noise. Currently, using capstan power, trigger electromagnetic solenoid (small and small output)
Has been adopted to obtain a required mechanical power source. However, such means has a drawback that the apparatus becomes large in size, accompanied by generation of mechanical noise and power consumption during a slight operation. In order to eliminate such a defect, a means for performing a trigger action using an adsorption lock type electromagnetic solenoid has begun to be adopted. By this means, the above-mentioned drawbacks can be eliminated, but there are the following drawbacks. By using a rotating cam to move the magnetic head support, which is the load, to the play mode position (play, queuing, or review mode position) by capstan power, turn off the power switch or carelessly When pulling out the power cord from the outlet, the result is that it is left in the playback mode, and the pinch roller is pressed against the capstan during that time, so the pinch roller is deformed, the magnetic tape is capped during playback, There is a drawback that an accident around the pinch roller occurs.

The device of the present invention is characterized in that such drawbacks are eliminated. Furthermore, as a matter of course, the command for the stop mode only needs to turn off the energization of the adsorption type electromagnetic solenoid, the configuration is simplified, the power consumption in the case of other mode switching is also small, and it is small and simple. Depending on the configuration, it is possible to obtain a device that operates reliably.

Furthermore, it is possible to switch between three modes of play, queuing, review, and stop by using only two adsorption lock type electromagnetic solenoids. Furthermore, by adding one adsorption type electromagnetic solenoid, The feature is that the pause mode can be changed by a push button switch.

Furthermore, since the locking action of the attraction type electromagnetic solenoid is performed by the sloped surface provided on the lever and the engaging member that abuts on the sloped surface, the required electromagnetic attraction force can be minimized. Therefore, there is a feature that enables the use of a suction electromagnetic solenoid that is smaller and consumes less power.

The details of the device of the present invention having the above-mentioned various features will be described below with reference to embodiments.

In FIG. 1, yokes 3a and 3b made of mild steel are attached to the N and S magnetic poles of the ferrite magnet 4 to form their magnetic paths. The magnet 4 has a rod shape and is fixed to the main body. One end of the yokes 3a and 3b becomes the magnetic path open end,
The bent portion 6b (made of mild steel) of the rotating lever 6 which is adjacent to the rotary lever 6 is electromagnetically adsorbed and locked. The exciting coil 5 is attached to the yoke 3a.

A notched gear 8 having a notched portion 8d in one part is supported on a support shaft 8a that is planted in the main body, and the notched gear 8 and a rotating cam 8c and a gear
8b is constructed as one body. A small gear 9 fixed to the capstan 9a is provided so as to face the cutout portion 8d. The bearing of the capstan 9a is omitted and not shown. The capstan 9a may be a rotating shaft of an electric motor, or the flywheel 9b fixed to the capstan 9a may be belt-driven by the electric motor. Reference numerals 1 and 2 are reel stands in which reels are fitted to fit with a hub for winding the magnetic tape when the cassette is used.
The drive device for the reel base is also omitted and not shown. The spring 10 is rotatably supported by a support shaft 10a provided on the main body, one end of which abuts on a column 10b fixed to the main body, and the other end of which is pressed against a rotating cam 8c. Provides torque to drive in the direction. The contact pin 8e that is set up on the gear 8 is in contact with the slope 6c at the left end of the rotating lever 6, so that the rotation of the notch gear 8 is suppressed. The rotating lever 6 is supported by a support shaft 6a provided on the main body, and is repelled counterclockwise by a spring 7.

The gear 11 is supported by the support shaft 11a provided on the main body, and the gear 8b
Meshes with. The gear 11 and the rotary cams 12 and 25 are constructed as one body.

The electric switches 26a and 26b are fixed to the main body and serve as electric switches in which the actuators 26c and 26d are brought into contact with only the protruding portions 25a and 25b of the rotary cam 25 to be closed. That is, the actuator
26c is in a relational position in which only the protrusion 25a contacts the actuator 25d, and the actuator 26d contacts only the protrusion 25b. The turning lever 14
It is supported by a support shaft 14a provided on the main body and is repelled counterclockwise by a spring 16.

The bent portion 14c of the lever 14b of the rotating lever 14 is a yoke.
It is designed to close the open end of 33 magnetic paths. The yoke 33 is fastened to the main body by a hole 33a. An exciting coil 34 is attached to the yoke 33.

A lever 13 is supported on a support shaft 13a provided on the main body, and an abutment pin 13d erected on a free end portion of the lever 13 abuts and engages with one of two inclined surfaces 15a and 15b of a rotary lever 14. It is becoming like this. A roller 13b is provided at a part of the lever 13 so as to come into contact with the convex cam portions 12a and 12b of the rotary cam 12.

A chain line indicated by a symbol 17 is a support stand that serves as a load on which a reproducing member such as a magnetic head is mounted. The support 17 has a spring 18
Is repelled in the direction of arrow A. The contact pin 17a provided on the support 17 is loosely fitted in the hole 13c provided in the lever 13. Therefore, slope 15a, contact pin 13d, hole 13c, contact pin 1
7a works together. In the position shown,
The support base 17 is spring-backed, and a contact pin provided on the main body.
It comes into contact with 17b and is in the stop mode position. Therefore, the magnetic heads 23a and 23b mounted on the support 17 are separated from the magnetic tape of the cassette (not shown) to be mounted.
A lever 28 is rotatably supported on a support shaft 28a that is planted in the main body, and is repelled in a clockwise direction by a spring (not shown). However, when the support base 17 is in the stop mode position, the contact pin 17d erected on the support base 17 contacts the left protruding end of the lever 28 to hold the pinch roller 29 and the capstan 9a apart. is doing.

When the support base 17 moves forward in the direction opposite to the arrow A, the magnetic heads 23a and 23b are brought into sliding contact with a magnetic tape (not shown), and the pinch roller 29 interlocked with the movement of the support base 17 moves the capstan 9a.
The magnetic tape is run in cooperation with.
The rotating cam 12 rotates counterclockwise, and the convex cam 12b
When the lever 13 is rotated counterclockwise through the 3b to bring the contact pin 13d into the engagement state of contacting the slope 15a,
When the exciting coil 34 is energized, the open end of the magnetic path of the yoke 33 is closed by the bent portion 14c of the lever 14, so that the lever 14 is locked. At this time, the support base 17 is in the play mode closest to the mounted cassette. Also lever 28
Rotates clockwise and holds a magnetic tape (not shown) between the capstan 9a and the magnetic tape to run the magnetic tape. Further, the convex cam portion 12a of the rotary cam 12 causes the lever 13 to rotate via the roller 13b, and the exciting coil 3
At the position where 4 is energized and the contact pin 13d is in contact with the inclined surface 15b, the support base 17 is retracted by about 2 to 3 millimeters to enter the queuing or reviewing mode. In this specification, the play mode, the queue, and the review mode described above are collectively referred to as a playback mode.

In the above-mentioned reproduction mode, when the exciting coil 5 is energized temporarily while the exciting coil 34 is still energized,
Since the magnetic flux due to this is in the opposite direction to the magnetic flux of the magnet 4, the attraction force of the lever 6 disappears and the contact pin
The lever 6e rotates the lever 6 in the clockwise direction against the repulsive force of the spring 7 by the force of pressing the slope on the left end of the lever 6. Accordingly, the lock by the lever 6 of the gear 8 and the contact pin 8e is released, and it is rotated clockwise through the spring 10 and the rotating cam 8c. Therefore, the gears 8 and 9 mesh,
The gear 8 makes one revolution and the gear 11 makes a half revolution. The ratio of the diameters of the gears 8 and 11 is 1: 2. Along with one rotation of the gear 8, the lever 6 already returned by the spring 7
The abutment pin 8e comes into contact with the slope at the left end of the abutment again and the rotation is stopped. At this time, the gear 9 opposes the space 8d and the power transmission is cut off. As described above, every time the exciting coil 5 is energized once, the gear 8 makes one revolution and the gear 11 becomes 1/2
It is configured to rotate.

The operation of the lever 6 described above can also be performed by the following means.

A lever 6d is rotatably provided on the left side of the lever 6 by a support shaft, is repelled in a clockwise direction by a spring (not shown), and its rotation is suppressed by an abutment pin 6f that is erected on the lever 6. The spring 7 is removed and the spring shown by the dotted line 7a is hooked.

The yokes 3a and 3b attract the lever 6 against the elastic force of the spring 7a by the magnetic force of the magnet 4. When the exciting coil 5 is energized for one hour, as described above, the lock of the lever 6 is released and the lever 7a is rotated clockwise by the spring 7a. Therefore, the lock of the gear 8 by the contact pin 8e is also released. It Therefore, the gear 8 makes one rotation, and the contact pin 8e
Presses the lever 6d to rotate the lever 6 counterclockwise against the elastic force of the spring 7a.
Are again adsorbed on the yokes 3a and 3b. Therefore, gear 8
When is rotated once, the contact pin 8e again contacts the left end of the lever 6 and is locked. Obviously, the same purpose can be achieved by this means.

As described above, when the gear 11 makes a half rotation, the rotation cam 35 that rotates in synchronization with the rotation cam 25 causes the roller 27 that contacts the roller 27 to rotate.
The lever 27 is rotated clockwise via c. Lever 2
7 is rotatably supported by a support shaft 27a that is erected on the main body, and is repelled in a counterclockwise direction by a spring 27b.
Is lightly in contact with the rotating cam 35. By the clockwise rotation of the lever 27 described above, the contact pin 27d erected on the lever 27 presses the left end of the lever 28, rotates it counterclockwise, and then returns.

The yoke 32 is fastened to the main body by a screw hole 32b, and the yoke 3
An exciting coil 32a is attached to the unit 2. The lever 31 is rotatably supported by a support shaft 31a that is planted in the main body, and is repelled clockwise by a spring (not shown).
At the position shown in the drawing in which the contact pin 28b that is planted at the right end of the lever 28 contacts the slope 31b of the lever 31, the exciting coil 32a
When is energized, the lever 31 is attracted and locked by the yoke 32, so that the lever 28 is also locked via the inclined surface 31b and the contact pin 28b, and in the playback mode, the pinch roller 29 is capped. Switch to the pause mode where it is held apart from 9a. At this time, by well-known means,
The drive of the reels 1 and 2 needs to be stopped.

Since the slanting surface 31b is used for the locking action, the energizing current of the exciting coil 32a is small, and the yoke 32 is also small in size.

When the energization of the exciting coil 32a is stopped, the contact pin 28b slides on the slope 31b and escapes, so that the pinch roller 29 is
Pressing against the capstan 9a, the magnetic tape starts running. At this time, a known means for starting the winding by the reel 2 is adopted. As described above, the cancellation of the pose is
This can be performed only by stopping the energization of the exciting coil 32a. The rotary cam 35 does not need to be separately provided, and the same object can be achieved by configuring the roller 27c to be in rolling contact with the convex cam portion 12b of the rotary cam 12.

Next, FIG. 3 shows an example of an energization control circuit for the exciting coil 5 (shown by the same symbol) in FIG.
When the push-button switch 37a is pressed, one terminal of the flip-flop circuit (hereinafter referred to as FF circuit) 38 is connected to the terminal 36.
A more positive voltage is input, the output is obtained from the Q terminal, and when the electric switch 26a is closed, the exciting coil 34 is energized. When the electric switch 37b is closed, the FF circuit 38
Is reset and the positive output of the terminal is an electrical switch.
When 26b is closed, the exciting coil 34 is energized.

Even if either of the push button switches 37a and 37b is closed, the exciting coil 5 is energized only while it is closed. Since the energization of the exciting coil 5 is required to be energized for one hour as described above, it is preferable to energize the exciting coil 5 for one hour by a known means using a capacitor or a monostable circuit. .

Next, the operation will be described with reference to FIGS. 1, 3, and 4. The state of FIG. 1 is the stop mode.

In FIG. 4, a rotary cam 39 that rotates in synchronization with the gear 11 of FIG. 1 is provided, and when the protrusion 39a comes into contact with the actuators of the electric switches 40a and 40b as the gear 11 rotates, these electric switches Is configured to be closed. Electric switches 40a, 40b are shown in FIG. 3 with the same symbols.

In the regeneration mode, that is, when the electric switch 26a of FIG. 3 is closed, the electric switch 40a is closed and the electric switch 40b is opened. However, when the queuing or review mode is selected, the electric switch 40a is turned on. The electric switch 40b is set to open and close.

When in the stop mode shown in FIG. 1, the push button switch 37 shown in FIG.
When a is pressed, the exciting coil 5 is energized for 1 hour,
The magnetic flux of the magnet 4 is canceled, the locking of the cut portion 6b is released, and the contact pin 8e presses the slope 6c, so that the lever 6 is rotated clockwise against the repulsive force of the spring 7. To do. Therefore, the contact pin 8e escapes from the slope 6c and the spring
The gear 8 rotates clockwise by 10 and the gears 8 and 9 mesh with each other to transmit power. Accordingly, since the rotary cam 12 rotates counterclockwise, the support base 17 is first moved by the cam portion 12a.
Moves to the Kyu, Rev position and the protrusion 25
Although b contacts the actuator 26d of the electric switch 26b and closes it, the excitation coil 34 is not energized because there is no output from the terminal of the FF circuit 38. However, it rotates further and the cam part 12b
As a result, when the support base 17 moves to the play mode position, the actuator 26c of the electric switch 26a abuts on the protrusion 25a and closes it. Accordingly, the electric switch 26a having the same symbol in FIG. 3 is closed, so that the exciting coil 34 is energized and held. At this time, since the contact pin 13d slides into the slope 15a, the lever 14 rotates counterclockwise and the bent portion 14d
c is strongly attracted and locked by the yoke 33, and the support 17 is localized at the play mode position. Also lever 6
Is returned to the position shown in the drawing by the action of the spring 7, the contact pin 8e contacts the slope 6c, and the gear 8 stops at the position where the cutout portion 8d faces the gear 9; Power transmission is cut off.

In the course of the above operation, the gear 11 makes about half a turn from the stop mode, passes through the review and que modes, and then becomes the play mode again. During this period, the ratio of the diameters of the gears 8 and 11 is set so that the gear 8 rotates twice. The gear 8 is configured so that the contact pin 8e contacts the slope 6c of the rotating lever 6 and automatically stops every time the gear 8 rotates once. Therefore, in the position of the selected mode, the gear 8 automatically stops, and in the non-selected mode, it is necessary to energize the exciting coil 5 for one hour to release the lock of the gear 8. The means for that purpose will be described below with reference to FIG.

As described above, when the Kew or Review mode is selected, the electric switch 40b is closed, so F
The positive output of the Q terminal of the F circuit 38 energizes the exciting coil 5. Therefore, the gear 8 can be rotated only once more to move the support to the play mode position. When the play mode is selected, the convex cam portion 12a of the rotary cam 12 shown in FIG. 1 does not change the mode between queuing and review, and even if the electric switch 26b is closed, F
This is because there is no output from the terminal of the F circuit 38. Furthermore, the gear 8 is not locked. Accordingly, the gear 8 makes one further rotation to perform the above-mentioned change of the play mode.

In the play mode described above, the push button switch shown in FIG.
When 37b is pressed, the exciting coil 5 is energized for one hour,
Further, the FF circuit 38 is inverted and the positive output becomes the output of the terminal. Accordingly, the gears 8 and 11 rotate together, and the counterclockwise rotation of the gear 11 causes the actuator 26c to escape from the protruding portion 25a of the rotary cam 25, and the electric switch 26a is opened. The electrical switch with the same symbol in FIG. 3 is also opened. Accordingly, the energization of the exciting coil 34 is also stopped, the abutment pin 13d of the lever 13 escapes from the slope 15a of the lever 14, and the support base 17 is spring-backed to the stop mode position. Further, the rotating cam 12 rotates, the cam portion 12a moves the support base 17 in the direction opposite to the arrow A direction via the roller 13b and the lever 14, and the actuator 26d of the electric switch 26b moves to the protruding portion 25b. By making contact, the electric switch 26b is closed. Accordingly, since the electric switch 26b of FIG. 3 is closed, the exciting coil 34 is energized via the electric switch 26b by the positive output of the terminal of the FF circuit 38. Accordingly, the lever 14 is locked,
Further, at that time, when the apex of the convex cam portion 12a reaches the roller 13b, the contact pin 13d of the lever 13 contacts the inclined surface 15b, and at this time, the bent portion 14c of the rotating lever 14 moves the yoke Since the open end of the magnetic path on the left side of 33 is closed, it is strongly adsorbed and locked. When the gear 8 rotates once, the contact pin 8e and the inclined surface of the rotating lever 6
The abutment of 6c stops the transmission of power, and at this time, the apex of the convex cam portion 12a stops at a position slightly beyond the roller 13b. As described above, the support base 17 is located at the positions of the queuing and review modes, which are set back by a few millimeters from the play mode.

Then, when the push button switch 37a for the play mode command is pressed again, the positive output of the FF circuit 38 is changed to the Q terminal side. When the exciting coil 5 is energized for one hour, the gear 8 makes one rotation and stops. The gear 11 makes a half rotation, and the electric switch shown in FIG.
Since 26a is closed, the exciting coil 34 is energized and the lever 14
Is locked, and at this time, the contact pin 13d is moved to the position of the inclined surface 15a by the convex cam portion 12b of the rotary cam 12. Therefore, the support base 17 is located at the position of the play mode.

When the power cord is pulled out or the stop mode command push button switch 37e (shown in FIG. 3) is pressed in the QUEU and REVIEW modes, the excitation coil 34 is de-energized, so that the lever 14 of FIG. The lock by the yoke 33 is released, the abutment pin 13d comes out from the slope 15b, and the support base 17 is spring-backed and is changed to the stop mode. At this time, if the QUEUE / REVIEW mode command push button switch 37b is pressed again, as described above, the positive output of the terminal of the FF circuit 38 is obtained, and when the gear 8 makes one rotation, the convex cam of the rotary cam 12 is rotated. The support 17 moves forward via the portion 12b and the roller 13b. However, at this time, although the electric switch 26a is closed, there is no output from the Q terminal of the FF circuit 38, and the FF circuit 38
However, since the electric switch 26b is opened, the exciting coil 5 is not energized. However, since the protrusion 39a in FIG. 4 abuts on the actuator of the electric switch 40a and closes it, the electric switch 40 having the same symbol in FIG.
When a is closed, the exciting coil 5 is energized by the positive output of the terminal of the FF circuit 38. Therefore, contact pin 8e, slope 6c
The lock by is released. Accordingly, the gear 11 is further rotated by a half turn and stopped, and the gear can be switched to the queuing and reviewing modes.

As described above, according to the device of the present invention, by pressing the mode conversion command push button switch, the play mode or the que, the review mode or the stop mode can be arbitrarily selected, and by turning off the power source, There is an obtained feature of the device that automatically converts from the mode to the stop mode.

As described above, even if the power cord is inadvertently unplugged from the outlet, or if the power switch is installed separately, it can be turned off regardless of whether the power switch is turned off.
Since the energization is stopped and the mode is automatically switched to the stop mode, one effect of the present invention is achieved.

In the stop mode described above, the electric switch that is opened by abutting the operator at the position of the support base 17 in the stop mode.
In the case where all the power supplies are cut off by 17c (shown in FIG. 1), even if the push button switch 37a of FIG. 3 is pressed to enter the play mode, the mode conversion is not started. In order to start, a known means for activating the power switch to turn on the power by interlocking with the pressing of the push button switches 37a and 38b, or the terminal 36 in FIG. Always supply power, press the push-button switch 37a to energize the monostable circuit, turn on the transistor by the output, energize the capstan motor for a predetermined time, and rotate the rotary cam 12 in FIG. And move the support 17 in the direction opposite to the arrow A to move the electric switch 17c.
It is necessary to carry out the above energization until is closed.

If the power switch is installed separately, or if there is a switch for switching to radio reception, turning off the power switch or switching the switch switches the energization of the exciting coil 34 to an automatic stop mode. It is effective to be able to return to.

In this embodiment, the open angles of the convex cam portions 12a and 12b of the rotary cam 12 are
Although it is 180 degrees, the present invention can be implemented even if this is set to 120 degrees and the gear 11 rotates once by three rotations of the gear 8. However, in this case, the electric switches 40a and 40b shown in FIG.
It is necessary to add another one to the above and install three electric switches with an opening angle of 120 degrees. The locking of the gear 8 is configured to be released in any case when the added electric switch is closed. Generally speaking, the gear 8 makes one revolution every time the gear 11 makes 1 / n rotation (n is a positive integer), and the convex cam portions 12a, 1a of the rotary cam 12 shown in FIG.
If the open angle of 2b is 360 m / n (m is a positive integer), the object of the present invention can be achieved. Further, the movement of the support base 17 is performed via the lever 13 and the roller 13b.
Alternatively, the roller 13b may be provided on a part of the support base 17 so as to make rolling contact with the rotary cam 12. In this case, the abutment pin 13d needs to be planted on a part of the support base 17 and engaged with the slopes 15a and 15b of the lever 4.

The present invention can also be implemented by providing the rotary cams 12 and 25 shown in FIG. 1 and the rotary cam 39 shown in FIG. 4 coaxially with the gear 8 so as to rotate synchronously. In this case, another notch 8d is provided at a point 180 degrees further away, and an abutment pin 8e is further provided at a point 180 degrees farther so that the gear 8 is automatically rotated every half rotation. Must be configured to stop. As a matter of course, two cam portions of the rotary cam 8c are also required with an opening angle of 180 degrees. Since it takes some time for the play mode to be switched between the queuing mode and the revue mode, the magnetic tape is transported during this period. In order to prevent this, a rotary cam that rotates in synchronization with the gear 8 is provided, and both reel bases 1 and 2 (shown in FIG. 1) are braked by a lever that abuts on this cam surface, thereby performing a braking action with a simple configuration. The slope 15a, 15b provided on the first lever 14 of the magnetic tape described above is provided at the right end of the lever 13, and the contact pin 13d is planted on the lever 13.
When the lever 14 is locked by the yoke 33 by providing the lever 14 at the free end, the same purpose can be achieved by locking the lever 14 by the contact between the above-mentioned inclined surface and the contact pin. .

Next, the change of the pause mode will be described. The push button switch 37c in FIG. 3 is a push-on / push-off switch. When this push button is pressed, the exciting coil 5 is temporarily energized via the capacitor 41a. Therefore, gear 8
Makes one revolution and the gear 11 makes a half revolution. At this time, since the electric switch 40b in FIG. 4 is closed, the electric switch with the same symbol in FIG. 3 is closed. Accordingly, the exciting coil 5 is re-energized, the gear 8 makes one further rotation, and
Since 11 turns a further half turn, as described above, the rotating cam
The lever 28 rotates counterclockwise via the 35, the roller 27c, the lever 27, and the contact pin 27d, and the pinch roller 29 is separated from the capstan 9a. At the same time, the exciting coil 32a is energized, so that the lever 28 moves to the contact pin 28b and the inclined surface 31b.
Locked by. At this time, the drive mode of the reel 2 is cut off by a well-known means to enter the pause mode.

Then press the electric switch 37c again to open it,
Since the exciting coil 32a is de-energized, the locking of the levers 31 and 28 is released and the levers 31 and 28 return. Therefore, the pinch roller 29 is pressed against the capstan 9a and the reel 2 is driven,
It is possible to return to the play mode or the recording mode.

When the electric switch 37c is a normal push button switch, the one indicated by reference numeral 37d in FIG. 3 is used. When the push button switch 37d is pressed, the FF circuit (JK type) 45 has an input, so it is inverted and a positive output is obtained from the terminal 45a.
Due to this output, the exciting coil 5 is input through the capacitor, and energization is performed for one hour, and the exciting coil 32
Since a is energized, you can switch to pause mode. FF circuit 4
It is necessary for 5 to be reset when the power is turned on so that the output of the terminal 45a is at a low level. Excitation coil
When the input voltage of 32a is small, a widening circuit may be inserted in the middle.

When the push button switch 37d is pressed again, the FF circuit 45
Is inverted and the output of the terminal 45a is converted to a low level, so that the locking of the levers 31 and 28 is released and the mode returns to the play mode or the recording mode. Bevel of lever 31
The same purpose can be achieved by providing 31b on the right end of the lever 28 and providing the contact pin 28b on the lever 31 side.

Next, the selection of the recording mode will be described.

In FIG. 3, when the push button switch 37a (play mode command push button switch) and the push button switch 37f (recording command push button switch) are simultaneously pressed, the exciting coil 42a is energized via the AND circuit 41.

In FIG. 2B, the support stand 17 (shown in FIG. 1) is provided with a switching switch 43 for reproducing and recording. The changeover switch 43 is indicated by the same symbol with a dotted line in FIG. A yoke 42 is fixed to the main body, and an exciting coil is attached to the yoke 42.
42a is installed. A lever 44 is rotatably supported on a support shaft 44a provided on the operator 43a of the switching switch 43, and is repelled in the clockwise direction of the arrow by a spring (not shown). The actuator 43a is repelled to the left by a spring, but its movement is suppressed at the position shown.

As described with reference to FIG. 3, when the push button switches 37a and 37f are pressed simultaneously, the exciting coil 42a is energized and the lever 44 is attracted by the yoke 42 and rotates counterclockwise. The portion 44b moves up to a position where it comes into contact with the slope 17e. Further, since the play mode is set by pressing the push button switch 37a, the support base 17 moves to the right of the arrow. Therefore, the actuator 43a also moves to the right via the slope 17e, the contact portion 44b, and the lever 44. When the support base 17 is localized in the play mode, the switching switch 43 is switched to the recording mode and the state is maintained.

Whichever mode is selected next, the support base 17 is spring-backed to the left, so that the actuator 43a is also spring-backed, and the switching switch 43 can be converted to the regeneration mode.

As described above, by utilizing the movement of the support base 17, the push button switches 37f and 37a are pressed to enter the recording mode, and by switching the other modes, the switching switch 43 can automatically return to the reproduction mode. is there. However, it is necessary to prohibit the above-mentioned return to the reproduction mode when the pause mode is changed. Therefore, it is preferable to keep the exciting coil 42a of FIG. 2 (b) energized by the output of the push-on switch 37c of FIG.

Next, another embodiment will be described with reference to FIG. The same symbols as those in the previous embodiment are the same members, so the description thereof will be omitted.

The rotating lever 19 is supported by a support shaft 19a provided on the main body, and is repelled clockwise by a spring 19c.
A gear 20 is rotatably supported on the support shaft 19a and meshes with the gear 11. A gear wheel 22 is supported by a support shaft 21a provided on the rotating lever 19, and a rotating wheel 21 that is eccentric with the gear wheel 22 is constructed as one body so as to rotate synchronously. The rotating wheel 21 is eccentric,
The circumference is a rubber ring. A small rotating wheel 9b made of plastic is fixed to the capstan 9a. The lever 19 closes the magnetic path open ends of the yokes 3a and 3b and is attracted by the magnetic force of the magnet 4.

When the exciting coil 5 is energized for one hour, the lock by the yoke 3a3b is released, so that the rotating lever 19 rotates clockwise and the rotating wheel 21 is pressed against the rotating wheel 9b. Since the rotating wheel 9b rotates counterclockwise, the gear 22 rotates clockwise and drives the gear 20, which serves as a load. The larger this load, the more the rotating lever 19 generates clockwise torque, and the rotating wheel 19
21 further strongly presses against the rotating wheel 9b, and the transmission torque increases. Therefore, even if the elastic force of the spring 19c is small, a large transmission torque can be obtained. Therefore, the electromagnetic locking device including the magnet 4 can be made small, and the energizing power of the exciting coil 5 can be very small.

The same effect can be obtained by using the rotating wheels 9b and 21 as gears.

Next, the operation of this embodiment will be described. When the exciting coil 5 is energized temporarily, the magnetic flux generated by the magnet 4 disappears,
The lock of the bent portion 19b is released. Therefore, the turning lever 19
Is rotated clockwise by the elastic force of the spring 19c, and the rotating wheel 21 is rotated in pressure contact with the rotating wheel 9b.

The gear 11 shown by the dotted line in FIG. 1, which is the same as the gear 11 having the same symbol, has the load shown in FIG. 1 but is not shown.

The gear 22 makes one revolution each time the exciting coil 5 is energized once, but if the gear 11 is set to make a half revolution at this time, the same effect as in the previous embodiment is obtained. Since the gear 11 rotates clockwise, the rotary cam shown in FIG.
For the twelve convex cam portions 12a and 12b, the rotary cam 35, etc., the cams must all be oriented in opposite directions.

As can be seen from the description of each of the above embodiments, the device of the present invention achieves the objects described at the beginning, and the effect is remarkable.

[Brief description of drawings]

FIG. 1 is an explanatory view of the device of the present invention, FIG. 2 is an explanatory view of a part of another embodiment, FIG. 3 is an energization control circuit diagram of the mechanism of FIG. 1, and FIG. Similarly, an explanatory view of a part of the rotary cam is shown. 1, 2 ... Reel stand, 3a, 3b ... Yoke, 4 ... Ferrite magnet, 5 ... Excitation coil, 6, 13, 14, 27,
31, 28, 19, 44, 6d ...... Lever, 6b, 14c, 19b ...... Bent portion, 33, 32, 42 ...... Yoke, 5, 34, 32a, 42a ...... Excitation coil, 7, 16, 7a , 27b, 19c, 10, 18 ... Spring, 11a, 8a, 21a, 14a, 6a, 13a, 27a, 28a, 31a, 19
a, 44a ... Support shaft, 25, 8c, 12, 12a, 12b, 35, 39 ... Rotating cam, 15a, 15b, 6c ... Slope, 13b, 27c ... Roller,
13d, 17a, 8e, 10b, 27d, 17d, 28b, 17b ... abutting pin, 8d ... notch, 9, 8, 11, 20, 22 ... gear, 21,
9b ... Rotating wheel, 29 ... Pinch roller, 9a ... Capstan, 23a, 23b ... Magnetic head, 43 ... Playback recording switching switch, 17c, 26a, 26b, 40a, 40b ... Electric switch, 9b
... flywheel, 43a ... actuator, 37a, 37b, 37d,
37f37e …… Push button switch, 37c …… Pushion push switch, 38,45 …… Flip flip circuit, 41 …… And circuit.

Claims (2)

[Claims] 1. A first locking means for locking the free ends of rotating levers 6, 19 by suction.
By energizing the exciting coil 5 of the attraction type electromagnetic solenoids 3a, 3b, 4 of FIG. 1, the attraction lock is released, and the first rotation is rotated by one rotation unit driven by the capstan power only while the attraction lock is released. Wheels 8 and 21, a gear 11 driven by a reduction gear having a reduction ratio of 2: 1 by the rotating wheels, a first rotating cam 12 and a second rotating cam 25 that rotate in synchronization with the gears.
Is supported by the main deck so as to reciprocate between a reproduction position where reproduction or queuing and review are performed in the vicinity of the mounted cassette and a non-reproduction position where the reproduction mode is separated and the stop mode is set. A second adsorption type including a support 17 on which a reproducing member such as a magnetic head that is repelled by a spring in a moving direction is placed, a yoke 33 fixed to the main body, and an exciting coil 34 fixed to the yoke 33. A part of the magnetic body of the first lever 14 rotatably supported by the electromagnetic solenoid and a support shaft provided in the main body is brought into contact with the magnetic path open end of the second attraction type electromagnetic solenoid to close it. As described above, the spring that repels the first lever and the convex cam portion 12 having a different diameter provided on the first rotating cam 12 at a distance of 180 degrees.
By moving a and 12b and the rollers rollingly contacting the convex cam portions 12a and 12b, the support base 17 is moved in the queuing mode, the review mode and the play mode, respectively, against the repulsive force of the spring. By the rotation of a predetermined angle of 12, the support base 17 springs back to a position of the stop mode,
When the exciting coil 34 is energized when the support 17 is moved to the play mode, the queuing mode, and the revue mode position, the first
The lever 14 of the first is attached to the yoke 33 by the adsorption lock, and the support 17 and the first
A device for preventing the springback of the support base 17 by the engaging portion of the lever 14 and a push button switch for instructing the play mode start energization of the exciting coil 5 and the protrusion of the rotary cam 12. By the rotation of the cam portion 12b, when the support base 17 is in the play mode position,
The electric switch 26a is actuated by the protruding portion of the rotating cam 25, the energization of the exciting coil 34 is started and held, and the exciting coil 5
The energization of the exciting coil 5 is started by pressing the first energization control circuit for stopping the energization of No. 2 and the push button switch for instructing the mode of the QUEU and REVIEW, and the rotation of the convex cam portion 12a of the rotary cam 12 When the support base 17 is in the queuing / reviewing mode position, the protruding portion of the rotating cam 25 operates the electric switch 26b to start and maintain the energization of the exciting coil 34, and energize the exciting coil 5a. The energization of the exciting coil 34 is stopped by pressing the second energization control circuit that stops the operation and the push button switch that commands the stop mode, and the suppression of the spring back of the support base 17 by the first lever 14 is released. And a mode switching device for a magnetic recording / reproducing apparatus, which is configured by a third energization control circuit that is springed back to a position in a stop mode. 2. A first locking means for locking the free ends of the rotating levers 6, 19 by suction.
By energizing the exciting coil 5 of the attraction type electromagnetic solenoids 3a, 3b, 4 of FIG. 1, the attraction lock is released, and the first rotation is rotated by one rotation unit driven by the capstan power only while the attraction lock is released. Wheels 8 and 21, a gear 11 driven by a reduction gear having a reduction ratio of 2: 1 by the rotating wheels, a first rotating cam 12 and a second rotating cam 25 that rotate in synchronization with the gears.
Is supported by the main deck so as to reciprocate between a reproduction position where reproduction or queuing and review are performed in the vicinity of the mounted cassette and a non-reproduction position where the reproduction mode is separated and the stop mode is set. A second adsorption type including a support 17 on which a reproducing member such as a magnetic head that is repelled by a spring in a moving direction is placed, a yoke 33 fixed to the main body, and an exciting coil 34 fixed to the yoke 33. A part of the magnetic body of the first lever 14 rotatably supported by the electromagnetic solenoid and a support shaft provided in the main body is brought into contact with the magnetic path open end of the second attraction type electromagnetic solenoid to close it. As described above, a spring that repels the first lever, and a yoke 32 and an exciting coil 32a that fix a part of a magnetic body part of a second lever 31 rotatably supported by a support shaft provided in the main body to the main body.
Is supported by a spring provided on the main body and a spring that repels the second lever 31 so as to close the magnetic path open end of the third attraction type electromagnetic solenoid. The third lever 28 and a pinch roller rotatably supported by its free end, a spring that repels the third lever 28 so as to press the pinch roller against the capstan, and a play of the third lever. A device for holding the pinch roller away from the capstan when the support table is in the stop mode and an engaging member engaging with the end and a first rotary cam 12 provided 180 degrees apart. By moving the convex cam portions 12a, 12b having different diameters and the rollers rolling on the convex cam portions 12a, 12b, the support base 17 is resisted against the resilience of the spring in the queuing, review mode and play mode. Move and then rotate cam 12 predetermined The rotation of the support 17 causes the support 17 to spring back to the position of the stop mode, the play mode, and the movement of the support 17 to the positions of the queuing and the review when the exciting coil 34 is energized. Lever 14 of No. 1 is adsorbed and locked by yoke 33, and is a support base.
A device for preventing the springback of the support base 17 by the engaging portion between the first lever 14 and the first lever 14, and the rotary cam described above.
In the direction in which the pinch roller is separated from the capstan by the convex cam portion 12 of 12 or the convex cam portion 35 that rotates synchronously at the in-phase position and the contact member that is moved by contacting the cam surface of the convex cam portion 12b or 35. The third lever 28 is rotated, and at the end of the rotation, the second lever 31 is moved to the exciting coil.
By energizing 32a, the device that locks the adsorption lock by the yoke 32 and by pressing the push button switch that commands the play mode, energization of the exciting coil 5 is started, and by the rotation of the convex cam portion 12b of the rotating cam 12, When the support base 17 reaches the play mode position, the electric switch 26a is actuated by the protruding portion of the rotary cam 25 to start and maintain the energization of the exciting coil 34, and the energization of the exciting coil 5 is stopped. By energizing the exciting coil 5 by pressing the first energization control circuit and the push button switch for instructing the queuing and reviewing modes, the support cam 17 is moved by the rotation of the convex cam portion 12a of the rotary cam 12. , When the position of the review mode is reached, the protruding portion of the rotary cam 25 causes the electric switch 26b.
And a second energization control circuit in which energization of the exciting coil 34 is started and maintained, and energization of the exciting coil 5a is stopped,
By depressing the push button switch for instructing the stop mode, the energization of the exciting coil 34 is stopped, and the restraint of the spring back of the support base 17 by the first lever 14 is released, and the spring is returned to the stop mode position. By energizing the exciting coil 5 by pressing the third energization control circuit and the push button switch for instructing the pause mode, the exciting coil 32a is energized by the operation of the electric switch 26a, and the pinch is separated from the capstan. At the position where the roller is held, the second lever 31 and the third lever 28 are locked and held by the engaging portion, and the push button switch for canceling the command of the pause mode is pressed to thereby excite the exciting coil 32a.
Magnetic recording, characterized by comprising a fourth energization control circuit for releasing the lock of the second lever 31 and the third lever 28 by stopping the energization of the second lever 31 and pressing the pinch roller against the capstan. Playback mode conversion device.