JPS6232356Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm mechanism for canceling the pause mode of a video tape recorder.

In order for the user to avoid recording unnecessary video signals during recording, the video tape recorder is equipped with a pause mechanism that only stops the running of the magnetic tape and enters a pause mode during recording standby. However, the normal pause mechanism only releases the pressure contact between the pinch roller and the capstan by pressing the pause button and cuts off the drive of the take-up reel table, and the rotating magnetic head is located at the same location on the magnetic tape wound around the guide cylinder. Since the recording medium continues to be scanned, setting the pause mode for a long time causes peeling of the magnetic tape recording medium and wear of the rotating magnetic head. However, users often use pause mode to avoid recording commercials during TV programs, and because the antenna output is displayed as a monitor image on the television receiver, they sometimes have to cancel the pause mode after the commercial ends. If you forget, you will end up not only having the troubles mentioned above, but also recording errors.

Therefore, the present invention generates an alarm output that alerts the user to be sure to cancel the pause mode after setting the pause mode during recording or playback, and after a certain period of time, if the recording mode is in progress, it will switch back to the recording mode. The present invention also proposes a new and effective alarm mechanism for canceling the pause mode, which causes the playback to enter the stop mode.

Before explaining one embodiment of the present invention below,
The mechanism of a conventional video tape recorder (such as Japanese Utility Model Application No. 52-30680) employing the present invention will be explained with reference to FIGS. 1 and 2. Figures 1 and 2 show the pinch roller pressure contact mechanism in recording/playback mode and pause mode, respectively. Figure 1 in the figure shows the magnetic tape mounted on the circumference of the guide cylinder and folded back. A leading guide 1a for guiding, a swinging rod 1c for supporting a pinch roller 1b for transferring the magnetic tape at a constant speed, and a guide pin 1d are respectively arranged, and are rotated to the illustrated position in conjunction with the cassette tape loading operation. The loading disk 2 is pivotally supported on a base, and in conjunction with recording/playback operations, presses the swinging rod 1c at the illustrated position with a pressing piece 2a, and presses the pinch roller 1b onto the capstan 3 with the magnetic tape T in between. A pinch roller pressure contact lever 4 is pivotally supported on a base and engages with a rotation regulating piece 2b of the pinch roller pressure contact lever 2 which is in the pinch roller pressure release position to prevent the pinch roller 1b from contacting the capstan 3. a pinch roller pressure regulating lever that prevents pressure contact, rotates clockwise in conjunction with the rotation of the loading disk 1 to the illustrated position, and allows the pinch roller 1b to come into pressure contact with the capstan 3 as shown in the figure; , 5 is a traction lever that elastically pulls the pinch roller pressing lever 2 in conjunction with the recording/playback operation, and 6 is a traction lever that is pivotally supported on the base and is interlocked with the sliding locking of the play lever 7 that accompanies the recording/playback operation. the traction lever 5 to the traction spring 5a.
A first rotating lever 8 is pivotally supported on a base and rotates in conjunction with the sliding of the pause lever 9, and is engaged with the cross-shaped notch 5b of the traction lever 5. A second mechanism for moving the traction lever 5 in the direction of releasing the pinch roller 1b using the vertical pin 8a.
A rotary lever 10 is a push-pull type lock plate of a known shape that engages with the lock pin 8b on the second lever, and 11 is the traction lever 5 that slides in the pinch roller pressure release direction in conjunction with the stop mode. The lock release pin 11a abuts against the shoulder 5c of the
A lock mechanism is shown in which the lock pin 8b and the lock plate 10 are unlocked by a lock release plate 11b which rotates as the lock pin 8b moves. Therefore, in the conventional mechanism described above, when loading ends after pressing the play button, the pinch roller 1b comes into pressure contact with the capstan 3 and enters the recording or playback mode (see FIG. 1). When the pause button is then pressed, the pause lever 9 slides downward in the figure and rotates the second rotation lever 8, so that the planting pin 8a is connected to the cross-shaped notch 5b of the traction lever 5. The traction lever 5 is brought into contact with the capstan 3 and the pinch roller 1b, and the lock pin 8b is brought into contact with the lock plate 10.
to lock the pause state. The above-mentioned conventional device has two types of means for canceling the pause mode. When the stop button is pressed, the play button and the record button are unlocked, the play lever 7 is returned to its original position, and the traction lever 5 is released. is further slid in the pinch roller pressure release direction, the shoulder portion 5c of the traction lever 5 guides the lock release pin 11a, and the stepped portion of the lock release plate 11b guides the protrusion 10a of the lock plate 10. a first means for releasing the engagement between the lock plate 10 and the lock pin by pressing down; and a first means for releasing the engagement between the lock plate 10 and the lock pin by pressing the pause button again;
and the second means for disengaging the lock pin 8b may be used as appropriate depending on the convenience of use. The conventional mechanism described above is equipped with an auto-stop mechanism that detects problems such as dew condensation and enters a stop mode, and automatically unlocks the play button and record button using the traction force of the plunger.

In this embodiment, the present invention is applied to the above-mentioned conventional configuration, and after a certain period of time has elapsed after the pause mode is set, a light and sound alarm is issued to alert the user, and then the user pauses for a certain period of time. If you do not cancel the mode, the pause state will be automatically canceled by activating the lock release mechanism if recording is in progress and returning to recording mode, and if the mode is in playback, by activating the auto-stop mechanism to place the device into stop mode. This paper aims to propose a mechanism to do this.

The operation of the circuit of this embodiment shown in FIG. 3 will be explained below. The circuit of this embodiment includes a pause switch SW ₁ that closes when the pause button is pressed, a play switch SW ₂ that closes when the play button is pressed, and a record switch SW ₃ that closes when the record button is pressed. When the pause button is pressed in playback mode, the closed circuit output of the pause switch SW ₁ is input to the first variable delay circuit 20 and the set time is
A first oscillator 2 that derives a first delayed output after T ₁ has elapsed and derives an oscillation output of an audible frequency from the output.
1 and a second oscillator 22 consisting of a long-period unstable multivibrator are respectively oscillated, and the display lamp 23 is made to blink with the second oscillation output to emit an alarm light, and the second oscillation output is used to cause the The opening/closing control of the first gate circuit 24 is performed to intermittently derive the first oscillation output, thereby causing the speaker 25 to emit an intermittent alarm sound. Further, since the first delay output is applied to the second variable delay circuit 26, the second delay output is derived after the set time of the second variable delay circuit 26 has elapsed, and the second delay output is applied to the second and third gate circuits 27 and 28. is opened, and the output of the first AND circuit 29, which is derived when the regeneration switch SW ₂ is closed, is connected to the second
Auto-stop circuit 30 via gate circuit 27
input, and activates the auto-stop plunger to enter stop mode. Therefore, if the set times _T1 and _T2 are set in advance according to the convenience of use, the alarm sound and alarm light will be generated after the desired time has elapsed, and the device will enter the stop mode after the predetermined time has elapsed.

On the other hand, if you press the pause button in recording mode, an alarm sound and alarm light will be generated after T ₁ has elapsed as described above, and then
After T ₂ has elapsed, the second and third gate circuits 27, 2
8 and enter the recording mode, i.e. the play switch.
A lock release plunger inputs the output of the second AND circuit generated when SW ₂ and the record switch SW ₃ are closed to the plunger drive circuit 32 via the third gate circuit 28 to release the pause mode. , and goes into recording mode again. It should be noted that the lock release plunger 12 of this embodiment
is linked to the lock release mechanism 11 disposed in the conventional mechanism described above, and as shown in FIG. 4, the lock release plate 11b is rotated clockwise against the traction spring 11c. The lock release plate 11b is rotated clockwise as the plunger drive circuit 32 generates an output to engage the lock plate 10 and the lock pin 8b. It is configured to be released.

Therefore, according to this embodiment, since a two-stage safety mechanism is provided, which calls the user's attention in the pause mode and automatically cancels the pause mode, troubles during the pause can be resolved, and the effect is great. . In this embodiment, a first variable delay circuit is provided to issue an alarm output after a certain period of time has elapsed after the pause mode is set, but the set time may be changed depending on the user's convenience.
It is also possible to use T ₁ as 0 or omit the first delay circuit so that the alarm output is issued at the same time as the pause mode is set.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the recording and playback mode of a conventional device.
FIG. 2 is a diagram showing the pose mode, FIG. 3 is a circuit diagram of an implementation of the present invention, and FIG. 4 is a diagram showing the main mechanism of the same embodiment. Explanation of main drawing numbers, 25... (for alarm) speaker, 23... (for alarm) display lamp, 11... lock release mechanism, 12... lock release plunger.

Claims (1)

[Scope of Claim for Utility Model Registration] In a video tape recorder equipped with a recording pause mode setting means that pauses the running of the tape while keeping the rotary head rotating during the recording mode setting, after a certain period of time has elapsed from the recording pause mode setting. a first delay circuit that issues a first timed output; an alarm circuit that issues an alarm upon receiving the first timed output; and a second timed output that receives the first timed output and further issues a second timed output after a predetermined period has elapsed. A pause mode cancellation alarm comprising a second delay circuit and a means for deactivating the recording pause mode setting means in response to the second timed output and causing the tape to run at a constant speed again in the recording mode. mechanism.