JPS5939356Y2 - Tape recorder control device - Google Patents

Description

[Detailed description of the invention] This invention relates to a control device for a tape recorder, and more specifically, the recording signal from a record player that is recorded on a magnetic tape is sized to the arm lowering time at the start of recording. Automatically records (or plays) without any discrepancies
It was made possible to do so.

In conventional tape recorders of this type, the tape recorder is in recording mode, and the Vincilrona is released from its capstan to temporarily stop the tape (pause), and then the pause is manually resumed at the desired time. The system is configured to solve the problem and start the recording operation.

However, since everything with this device is manually operated, it has the drawbacks that it is not possible to record when you are away or not, and it is not easy to dub records.

In consideration of this point, in the past, the answering machine recording operation was performed by automatically opening and closing the capstan motor power supply and controlling the contact and separation of the pinch roller with respect to the capstan via a timer relay and plunger. However, since the tape starts to run gradually from the time when the motor starts running at the same time, it takes 2 to 3 seconds from the start of recording.
Seconds will be in an abnormal recording state, and when played back, abnormal sounds will be generated, and in video-related applications, screen holes will occur, which is extremely unpleasant. Since the capstan and the pinch roller come into contact with each other before the rotation starts, the motor is overloaded and cannot rotate, which can eventually burn out the motor, overheat the battery, or cause serious damage to the motor. This had the major drawback of causing a drop in electromotive force.

Therefore, the present invention was devised to eliminate all of these conventional drawbacks, and by automatically controlling the displacement of the pinch roller and idler after the motor of the tape recorder in standby mode starts rotating, the record player starts operating. It was devised so that accurate magnetic recording could be performed with no deviation of even a fraction of a second from the point in time.

This will now be explained in detail with reference to the illustrated embodiment.

In FIG. 1, reference numeral 1 indicates a board of a cassette tape recorder, and 21 and 22 are reel receivers provided at predetermined positions on the board, and an idler that is to come into contact with the take-up reel receiver 21 and the driving shaft 3. A tension spring 5 for ensuring contact is connected to the center axis of the connecting piece 4, and a connecting piece 6 is connected to the central axis of the connecting piece 4, and the front end of an L-shaped movable piece 7 is pivotally connected to the rear end of this connecting piece.

This movable piece can move vertically and straightly on the substrate 1 by engaging groove pins at three locations, and is provided with a hook projection 8 at its free end.

Reference numeral 91 denotes a play button provided on the front part of the board 1. When pressed, the play button is locked as is well known, and the U-shaped movable plate 10 connected to this moves vertically on the board by engaging with four groove pins. The magnetic head 111j mounted on the movable plate moves straight forward.
112 is brought into contact with, for example, the magnetic tape of the cassette 12, and the pinch roller 13 is brought into contact with a capstan 14 protruding above the substrate.

However, this pinch roller is attached to a swing piece 17 whose one end is pivoted to a pivot shaft 151 fixed to the movable plate 10 and biased counterclockwise by a spring piece 161 fixed to the pivot shaft. At the other end there is a pin 181 which should come into contact with the hook projection 8 of the movable piece 7, and which comes into contact with the front end of the groove 19 of the movable plate 10.

Reference numeral 92 designates a button-type temporary stop operation button provided next to the play button. When pressed, the left end of the lever 20, whose middle part is pivoted on the board 1 at 152, is pressed forward. There is a groove 192 on the right end of the movable piece γ.
It engages with a pin 182 fixedly planted above.

Further, reference numeral 21 denotes a locking piece shown in FIG. 4A which is pivotally mounted 153 on the rear part of the board 1, and is biased counterclockwise by a spring piece 162 shown in FIG. The front part of the piece is hook-shaped, and a pin 183 fixed to the bottom of the movable piece 7 is engaged with the oblique side 22 facing downward to the left.

Immediately after this oblique side, a cut and raised slope portion 23 is provided, and a protrusion portion 24 is formed by this cut and raised portion.

P in each figure is a plunger to be described later for rotating the locking piece 21 when desired.

The mechanical groove of the present invention is as described above, and next, an example of the control circuit of this invention will be explained with reference to FIG.

In the figure, 81 is a timer switch, S2 is a main switch of the tape recorder, T1 is a transformer, and T2 is a rectifier circuit.

Switch S1. When S2 is turned on, capstan motor M is energized and started, and resistor P1. R2 and capacitor C1
After the rotation start-up time t□ of the motor M has elapsed, the transistor Q1 is turned on, and the transistor Q2 connected to the collector of the transistor Q1 is turned off, and the transistor Q2 is turned on via a time constant circuit and a Zener diode ZD. A differential waveform voltage appears at point Y due to a change in the collector potential of capacitor C2 and resistor R3 through a differentiating circuit comprising capacitor C2 and resistor R3 and changeover switch S3, and only during the time that the differential waveform voltage appears, transistors Q4. Q5 is turned on and the plunger P is temporarily excited after the rise time t0 has elapsed.

Further, the recorded signal applied to the recording signal input terminal T is amplified by the amplifier A1 and then supplied to the recording head H via the resistor R8 and the recording circuit A2 for normal recording. By connecting the collector of the transistor Q3 with its emitter common to the side and controlling its base potential with the collector potential of the transistor Q1, the transistor Q3 is turned on for the rise time t1 and the input to the recording circuit A2 is cut off. It's Nishide.

Note that S4 is a switch related to the temporary stop operation button, which is open when the machine is in a temporary stop state, and prevents the plunger P from being excited when the machine is not in a temporary stop state.

Resistors R4 and R5 are collector load resistances of the transistors.

In particular, in the present invention, a capacitor C3 having approximately the same value as the capacitor C2 is connected to the other fixed contact of the switch S3 in the above circuit, and the other end of this capacitor C3 is connected to the hot side tongue Ja of the plug-in jack J1. At the same time, this tongue piece Ja is grounded through the resistor R6, and the jack J1
The ring Jb is connected to the power line C.

Note that R7 is a differential resistance.

Furthermore, an arm lift limit switch S5 is connected to the plug J2 which is inserted and connected to the jack J1, and is turned on in connection with the lowering movement of the arm in the audio or video record player RP. When S5 is turned on, a differential pulse is applied to the base of transistor Q4 (point Y) via switch S3 by a differential circuit including capacitor C3 and resistor R7.

The overall structure of the present invention is as described above, and its operation will be explained next.

In Fig. 1, if you press the record button 90 and the play button 91, the second
As shown in the figure, these buttons are locked in their positions, and the movable plate 10 moves forward to open the heads 111 and 112.
is in contact with the tape of the cassette 12, and the pinch roller 1
3 comes into contact with the capstan 14, and the tape recorder enters the normal recording state.

In this invention, if the timer switch S1 is opened in advance and the motor M is stopped, the standby state for the following recording mode is established.

That is, when the push-button-type temporary stop operation button 92 is pressed, the recording preparation (standby) state is entered as shown in FIG.

That is, at this time, since the left end of the lever 20 is pushed forward, this lever rotates clockwise around the pivot 1520, and the movable piece 7 is moved back through the pin 182 by the groove 192, and the idler 4 is moved through the connecting piece 6. As soon as the roller is released from the driving shaft 3, the rotating piece 1T is rotated clockwise by the hook projection 9 via the pin 181, the pinch roller 13 is released from the capstan 14, and the recording mode is on standby.

At the same time, as the movable piece 7 retreats, the pin 183 presses the oblique side 22 of the locking piece 21, so the locking piece rotates slightly clockwise against the spring piece 162, but the oblique side After passing the pin, the locking piece is rotated back by the spring piece,
The pin 183 comes into contact with the opposite side of the oblique side, and the retreating state of the movable piece 7 is locked, thereby maintaining the standby state of the recording mode.

At this time, the switch S3 (FIG. 5) is kept in the solid line state.

Next, at a desired time ta, when the timer switch S1 is closed by the dusk or by remote operation, the motor M starts rotating, the capstan 14 starts rotating, and the rotation of the motor M starts as shown in FIG. After the rise time t1 has elapsed, the time constant circuit (CxtRl) described above causes the transistors Q1°Q4. Q5 (Fig. 5) turns on and plunger P
is automatically temporarily excited, and the locking piece 21 holds the spring piece 16≦
The locking piece 21 is lifted up slightly against the spring piece 16.
As the pin 183 rotates counterclockwise with 20 elasticity, the pin 183
After that, the movable piece I is moved forward by the tension spring 5, and the recording standby state shown in FIG. The desired time t.

Recording will definitely start.

Note that this time t. Then, of course, the transistor Q mentioned above
3 (Fig. 5) is off, the recorded signal to the recording circuit A2 is not cut off, and when the push piece 92 returns, the switch S is turned off.
4 is turned on, the electric current of the plunger P is cut off, and the motor M1 shaft stan 14 rotates at a constant speed and the L
Therefore, accurate recording is possible from the beginning of the recording time (as a result, there will be no abnormal sounds during playback, and when playing back the video after shooting, there will be no synchronization loss or screen distortion, etc.) It is possible to display the playback screen in a normal state without any interference.

In addition, to play a desired record using the record player RP and record the playback signal on the tape, first switch S3 to the dotted line position, then plug J into jack J.
2 is inserted and connected, the switch S5 is turned on in connection with the lowering operation of the arm in the record player RP (automatically in a fully automatic player), so a differential pulse is applied to the base of the transistor Q4 (point Y) in FIG. is applied via the switch S3, and the plunger P is temporarily excited, so that each part operates in the same manner as the timer operation, and the record is automatically reproduced from the beginning without any slight deviation and in a noiseless state. The recording operation, so-called fully automatic dubbing, can be performed.

Note that this invention can naturally be applied to dubbing a video signal from a video disc player to a VTR.

As described above, according to this invention, when starting the tape recorder from the standby or pause state of the recording or playback operation, first, a means for starting the tape feeding motor and a means for rotating the motor are provided. switch means that opens and closes in conjunction with the downward movement of the arm of the audio or video record player after the rise time has elapsed; means for temporarily energizing the plunger that maintains the standby state by the switch means; means for releasing the standby or pause state; and means for starting the tape at a constant speed by pinching and elastically contacting the pinch roller with the capstan which has been normally rotated by the rotational force of the motor. Since the tape recorder is configured to automatically enter the recording or playback mode from the start of the record player, so-called dubbing, in which the playback signal of the record player is automatically dubbed onto the magnetic tape, can be performed in seconds. The effect is that it can be performed reliably and easily without any errors.

In particular, with the present invention, there is no occurrence of abnormal noise, image disturbance, color unevenness, etc. when the motor starts to rotate.

In particular, even if noise due to motor rush current is added to the recording circuit, it is grounded by the transistor, so it is extremely effective in that beautiful sound and beautiful images can be produced from the beginning of the recording process.

In addition, since the pinch roller is never in pressure contact with the capstan when starting the motor, many of the drawbacks seen in the conventional example, such as motor stalling and battery overheating, can be eliminated, and the plunger Since P only needs to be excited at the moment when the pause is released, power loss and overheating occur.
This is a useful idea with excellent effects.

[Brief explanation of drawings]

The figures show examples of this invention.
Figures 2 and 3 are plan views showing the main parts of the mechanical structure of the present invention in different states, Figures 4A and B are exploded perspective views of the locking piece, and Figure 5 is used in the present invention. FIG. 6 is a circuit diagram showing an example of a preferred control circuit, and FIG. 6 is a time chart for explaining the operation of the present invention. 3... Driving shaft, 4... Idler, 7.
...Movable piece, 90, 91-93...Operation piece (push button), 111, 112 (H)...Head, 13...Pinch loaf, 14.・・・・・・
Capstan, 21...Locking piece, Q1-Q3--
・・・Transistor, A2...Bone circuit, Sl
...Timer switch, S2... Main switch of tape recorder, S3... Changeover switch, S4... Switch related to pause button, S5... ... Switch related to lowering the arm, P ... Plunger, Ro. R1-R7---ML C1t C2> C3・
... Capacitor, M ... Motor, zD.
...Zener diode.

Claims (1)

[Scope of utility model registration request] Means for obtaining a standby or pause state for recording or playback operation of a tape recorder; switch means for opening and closing in conjunction with the lowering movement of an arm of an audio or video record player; and a plunger for maintaining said standby state by this means. means for temporarily energizing the tape, means for releasing the standby or pause state via the plunger, and means for starting the tape at a constant speed by causing the pinch roller to pinch the tape against the capstan and come into elastic contact with the capstan. A control device for a tape recorder, characterized in that the control device is configured to automatically put the tape recorder into recording or playback mode tx3 from the start of the record player.