JPS6028061B2 - Alternative selection device for mode switching of magnetic recording/playback machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic shirt-off device for a mode change selection device in a magnetic recording/reproducing machine using a cassette.

The technology commonly used in such devices is to drive an electromagnetic plunger using an electric signal obtained when the magnetic tape is completely wound onto one of the reels.
There is a device in which the locking bar of the alternative selection mechanism is moved back and forth through one reciprocating movement of the actuator, thereby returning all the push buttons for mode change commands and setting the stop mode.

The electromagnetic plunger described above requires a relatively large size and requires about 20 watts of instantaneous power. Therefore, the power supply must have a large capacity, and it has the disadvantage that it cannot be used except in special high-end machines. Also, if the power switch is inadvertently opened in the regeneration mode, the mode switching alternative selection device will remain in place, resulting in the pinch roller being left in pressure contact with the cap stun. Therefore, there is a drawback that the pinch roller is deformed and the reproduced sound quality changes. According to the device of the present invention, the above-mentioned disadvantages are eliminated, and since the power required for this purpose is less than 1 watt, as will be explained later, the above-mentioned disadvantages are eliminated.

It also has the characteristics of being small, lightweight, and inexpensive. Furthermore, the push pin for the stop mode command becomes a soft touch, and even if you turn off the source switch or the engine switch of a car, or pull out the power cord from the outlet, the auto-shut-off operation will be performed automatically. It has the characteristic of converting to stop mode. Furthermore, if the cassette is ejected during playback, it will be impossible to lift up the cassette due to the presence of the magnetic head that has entered the cassette, and if the cassette is forcibly ejected, it may cause a malfunction. According to the present device, such defects can be easily eliminated. Next, details of the apparatus of the present invention having the above-mentioned features will be described with reference to embodiments.
FIG. 1 shows an example of an electromagnetic locking device used in the device of the present invention.

In FIG. 1a, the one indicated by the symbol 39 is formed by pressing a mild steel plate, and has a brim-shaped core.

At the left end of the cliff body 39, a diamond body 39b made of a similarly pressed European steel plate is press-fitted. A hole having a flange portion 39c is provided in the center of the lid body 39b by press working. The flange portion 39c is intended to reduce magnetic resistance with a cylindrical actuator 40, which will be described later, and to increase the frictional force between them, but is not necessarily necessary. A front view of the lid body 39b is shown in figure b. As can be understood from the front view, the cross section of the pupil body 39 may be circular, but it has a shape with the top and bottom of the circle removed to flatten the entire body and make it easier to use. Figure 1d
What is shown in FIG. 2 is an excitation coil 39a and a coil frame 43 provided inside the lotus body 39. The coil frame 43 is a plastic molded body, and the frames at both ends are dimensioned so that when inserted into the weight body 39, they stick tightly to the inner wall of the weight body 39 and do not move. An excitation coil 39a is attached to the winding core 43a. In the circular hole having the flange portion 39c and the innermost hole of the winding core 43a, an actuator 40 made of a mild steel cylinder is provided so as to be movable.
(shown in Figure 1c) has been inserted. As shown in FIG. 2, the sparrow body 39 and the lid body 39b are embedded in a plastic support body 29 (electromagnetic locking device) and fixed with an adhesive. Next, its operation will be explained with reference to FIG.
The support body 29 is screwed to the main body through holes 29a, 29b, and 29c. The part indicated by symbol 29e is the critical condition 3.
This is a protrusion to prevent 9 from moving to the left. The right end of the actuator 36 is bent, and a magnetic cylindrical actuator 40 is formed.
A recess 40a is provided at the left end of the recess 40a as shown in FIG. 1c.

Therefore, the actuators 40 and 36 are connected by the new music section 36-2 being engaged with the recess 40a. Actuator 36
The left end constitutes a lever 36 in FIG. 3, which will be described later.

When the actuator 36 is moved to the right, the actuator 40 also moves, so that the right end of the actuator 40 comes into close contact with the portion 39d of the bottom surface of the weight body 39. Therefore, the passageway is completely closed, attracted and locked, and has the effect of electromagnetic locking. At this time, the flange portion 39c has the effect of reducing magnetic resistance. Furthermore, since the entire structure is sealed, the above-mentioned contact surface is always kept clean. Also actuator 4
Unlike general electromagnetic plungers, the actuator 40 is configured to be attracted to a part of the side surface of the flange portion 39c and come into close contact with it, so that the force that attracts the actuator 40 to the right and the friction caused by the close contact described above are reduced. The forces are approximately equal, so the locking effect is achieved only when the right end of the actuator 40 comes into close contact with the portion 39d without being sucked in. Furthermore, when locking, actuator 3
When attempting to move 6, 40 to the left, the frictional force between the collar portion 39c and the actuator 40 is reversed, which has the effect of doubling the locking force. Next, the apparatus of the present invention will be explained with reference to FIG.

The electromagnetic locking device described above connects the magnetic path of the yoke 39 to the actuator 4.
Since the locking (locking) action is performed by closing the right end of 0, the excitation current for locking is 12 volts.
At around 0 milliamps, it has the effect of locking with a small amount of electric power. Therefore, there is no need to particularly increase the capacity of the power transformer, which is effective. In FIG. 3, a frame 64 is fixed to the deck surface of a magnetic recording/reproducing machine (not shown).

The locking bar 71 is held with respect to the frame 64 so that it can slide in the direction of the arrow, and the spring 7
1a, it is shot in the opposite direction to the arrow date. Mataoshibutton Village 65a, 66a, 67a... ... is frame 64
It is arranged perpendicularly to the locking bar 71 so as to be able to slide against the locking bar 71. Push nails 65, 66, 67
...... are push-button pestles 65a, 66b, 67a, respectively.
...is set up. Further, each push button and push nail punch are pushed in the direction of arrow P by a spring (not shown). When pushing the push spade 66 to the right, the locking bar 7
The push button 66 and the push sword punch 66a are held while moving rightward by the locking pin 71b standing upright at 1 and the locking portion 66b of the push button village 66a. Other push buttons 65,6
7, the locking pin, and the locking portion are also operated in the same manner, and by pressing any press steel to the right, the corresponding push button village is alternatively selected and locked. It constitutes a selection mechanism. When push button 66 is pressed, push button village 6
The right end of 6a is pressed and the playback mode is switched for one day. That is, the take-up reel is driven to take up the magnetic tape, and the capstan motor and the multiplication circuit are powered on.
Furthermore, the support base on which the magnetic head and pinch roller are mounted advances to the reproduction position and reproduction is started. The mechanism described above is designated by symbol 69. Note that any known means may be used for these mechanisms. When the push button 67 is pressed, the push button punch 67a moves to the right and is locked, and the push button 66 returns to its original position.The mechanism indicated by symbol 70, ie, the necessary well-known mechanism, begins to operate, so that the winding is stopped. Convert to return mode. Next, pusher metal 065
When pressed, the pusher 65a advances and is locked, and the pusher 67 returns to its original position, and the mechanism indicated by symbol 68, ie, the necessary parts of the fast-forward mechanism, begins to operate, so that the mode is changed to the fast-forward mode. It is something. Other modes such as review,
A push button for changing modes such as cue and recording is also placed side by side, but is not shown. Press button 6 again
When all of the cassettes 5, 66, 67, . In this case, it is a stop mode. The item indicated by the symbol 29 has the same symbol as explained in FIGS. 1 and 2, and is an electromagnetic locking device.
Therefore, by energizing or cutting off the excitation coil 39a, the actuator 36 (functions as a flat lever) is activated.
) are locked or unlocked. The illustrated state is locked. The shield pin 76 established on the locking bar 71 is loose in the slit 73 provided in the actuator 36, so that the locking bar 71 and the actuator 36 move relative to each other within a predetermined tolerance range. It has become. A spring 74 is applied between the shield pin 75 and the shield pin 76 that stand on the actuator 36, and urges the locking bar 71 and the actuator 36 to approach each other.
This elastic force is set larger than that of the spring 71a. When the locking bar 71 moves in the opposite direction to the arrow, it slides against the elastic force of the spring 74, and when the lock of the actuator 36 is released, the spring 71a
Due to the elastic force, the locking bar 71 and the actuator 36 move together in the direction opposite to the arrow. Therefore, push button pestle 65
, 66, 67, . . . are all released and returned to their original positions, so that they automatically switch to the stop mode as described above. The lever 72 is supported by the frame so as to be movable parallel to the locking bar 71, and is lightly biased in the direction of arrow N by a spring. lever 72
The protrusion 72b at the end is configured to press an electric switch 72c to close it. The electric switch 72c serves as a power switch as will be described later, and is used to turn on the power only in modes other than stop. Further, the bucket pin 72a at the end of the lever is in a position to support the protrusion 36-1 of the actuator 36. Push nails 65, 66, 67... in stop mode.
If you press any one of these push buttons while ... has returned, the push button pestles 65a, 66a, 67a, ...
Slope portions 65b, 66b67b.・・・．・・・
The support pin 65 that stands on the lever 72 by one of the
c, 66c, 67c, . . . are pressed by the above-mentioned slopes to move the lever 72 in the direction of arrow N. Therefore, when the electric switch 72c is closed, the actuator 36 is pressed and moved to lock it. Power switch 73
When the is closed, the excitation coil 39 is activated by a power source (not shown).
a is energized. Therefore, the actuator 36 is locked. As understood from the above explanation, the push buttons 65, 6
By pressing buttons 6 and 67, the corresponding mode is selected, and when the excitation coil 39a of the electromagnetic locking device 29 is de-energized, the locking bar 71 springs back and all the push buttons 65, 66, 67, etc. ．． ...recovers and automatically enters stop mode. Since the power needed to lock the actuator 36 is small, it can be effectively used as an automatic shirt-off means. Furthermore, even if the plug is pulled out from the power outlet, the excitation current is cut off and the system enters the stop mode, which is effective. This is also effective when ejecting a cassette, since the stop mode is automatically converted by turning off the excitation current using an electric switch at the time of ejection. As can be seen from the above description, the apparatus of the present invention achieves the object of the present invention stated at the beginning and is highly effective.

[Brief explanation of drawings]

1 and 2 show an electromagnetic locking device used in the device of the present invention, and FIG. 3 shows an explanatory diagram of the device of the present invention. 39, 39b... Yoke, 40, 36... Actuator, 39a... Excitation coil, 43...
Bobbin, 68, 69, 70...Fast forward, playback, rewind mechanism, 65, 66, 67...Push button, 65a, 66
a, 67a... Push spade, 64... Frame, 71... Locking bar, 72... Lever, 71a, 74... Spring, 72c...
...Power switch, 73...Slit, 72a, 7
5,76...Tatedate pin. Fist Figure 2 Figure 3

Claims (1)

[Claims] 1. Alternative locking of a plurality of manual pushbuttons for instructing modes such as playback and stop of a magnetic recording/playback device using a cassette, and a plurality of operating rods for mode switching operated by these buttons. In a magnetic recording/playback machine equipped with an alternative selection device that switches to a corresponding mode and also switches to a stop mode when all mode switching operating levers spring back, the mode switching operating levers are selectively locked. a locking lever that is provided with a function and is supported by the frame so as to be able to reciprocate; and a first lever that releases the locking of the operating rod for switching to a locked mode by elastically moving the locking lever. a spring, a return lever supported by the frame so as to be able to reciprocate, a yoke fixed to the main body and provided with an open end of the magnetic path, and an excitation coil attached to the yoke, when reciprocally moved. and a reciprocating lever including a magnetic body that is locked to close the open end of the magnetic path of the yoke and is provided to open the open end of the magnetic path when the yoke moves backward; a second spring which is supported so as to slide relative to each other and which repels both levers toward each other with a force stronger than the repulsive force of the first spring; and a mode switching operating rod. When activated, the movement of the operating rod moves the above-mentioned return lever forward, and its end moves the above-mentioned reciprocating lever, closing the open end of the magnetic path of the yoke, and closing the reciprocating lever. A mode changeover for a magnetic recording/playback machine characterized by comprising a mechanism that interlocks with the restoring lever to make the return movement, and an energization control circuit that cuts off the energization of the excitation coil by opening the power switch. multiple-choice device for.