JP2745265B2 - Cassette insertion / ejection processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus which has a function of automatically inserting and ejecting a cassette such as a video cassette.
The present invention relates to a cassette insertion / ejection processing device that prevents erroneous operation of cassette insertion.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram showing a schematic configuration of a main part of a conventional cassette insertion / ejection processing apparatus having this kind of erroneous operation prevention mode.

In FIG. 1, reference numeral 1 denotes a cassette unit in a video tape recorder (VTR), 2 denotes a forward / reverse rotation type motor for inserting / ejecting a cassette, 3 denotes a cassette insertion detection switch, and 4 denotes a cassette insertion completion detection switch. 5 is a microcomputer, 6 is a motor driver, 7 is an erroneous operation prevention switch, 8 is an LED drive transistor, and 9 is an erroneous operation prevention mode display LED.

Next, the operation will be described with reference to the flowchart of FIG.

In the normal mode, the erroneous operation prevention switch 7 is in an OFF state. At this time, the PNP type L
The base of the ED drive transistor 8 is a DC power supply + B
, Is in a non-conductive state, and the erroneous operation prevention mode display LED 9 is turned off. The input port 5b of the microcomputer 5 is set at "H" level by the DC power supply + B.

When the user wants to prevent an erroneous operation such as overwriting and recording using a cassette already recorded by a child against his / her intention, the erroneous operation prevention switch 7 is turned on. Then, the LED drive transistor 8 has its base grounded via the erroneous operation prevention switch 7 and becomes conductive, so that the erroneous operation prevention mode display LED 9
Lights up. Also, the input port 5b is “L”
Level.

When the user manually inserts a cassette from the cassette insertion slot on the front of the VTR (step n).
1) The cassette insertion detection switch 3 is turned on (active), and the input port 5a of the microcomputer 5 which has been set to the "H" level by the DC power supply + B until then is inverted to the "L" level. No. 5 recognizes that the cassette has been inserted (step n2).

Next, the microcomputer 5 reads the state of the input port 5b and determines whether the erroneous operation prevention switch 7 is ON (incorrect operation prevention mode) or OFF (normal mode) (step n3).

Normal Mode When the erroneous operation prevention switch 7 is in the OFF state (normal mode), the input port 5b is at “H” level.
The microcomputer 5 starts the operation of inserting the cassette into the cassette storage unit. That is, a forward rotation command signal is sent from the output port 5d to the motor driver 6, and the motor driver 6 is controlled to
To rotate forward. Then, the cassette support frame is moved via a transmission mechanism (not shown) such as a gear, a rack or a lever in the cassette unit 1, and the cassette is automatically inserted into the cassette storage unit (step n4).

A cassette insertion completion detection switch 4 is provided in the cassette storage section. With the completion of the insertion of the cassette into the cassette storage section, the cassette insertion completion detection switch 4 is turned on (active) and the input port 5c is provided.
Is inverted to the "L" level, the microcomputer 5 recognizes the completion of the insertion of the cassette (step n5).
Then, the microcomputer 5 includes the motor driver 6
Then, the insertion / ejection motor 2 is stopped via (step n6). Thus, a normal cassette insertion operation is performed.

When the cassette discharge operation is performed in the normal mode in a state where the cassette is stored in the cassette storage section, the microcomputer 5 sets the output port 5e.
Sends a reverse rotation command signal to control the motor driver 6 to rotate the insertion / ejection motor 2 in the reverse direction and eject the cassette in the cassette storage section toward the cassette insertion slot.

Misoperation prevention mode Misoperation prevention switch 7 is in ON state (misoperation prevention mode)
, The input port 5b is at the “L” level.
The erroneous operation prevention mode display LED 9 is lit. In this state, the child may insert the cassette into the cassette insertion slot without knowing or mischief. The user may do so due to misperception.

However, the microcomputer 5 does not give a command to the motor driver 6 because it is determined by reading the input port 5b that the erroneous operation prevention switch 7 is ON (step n3).
That is, the insertion of the cassette is prohibited (step n7).

That is, even if the cassette insertion detecting switch 3 is turned on, the operation of the insertion / ejection motor 2 is forcibly prohibited as long as the erroneous operation prevention switch 7 is turned on, so that the cassette is erroneously inserted. Is to prevent it.

[0015] Such a function is particularly for preventing mischief of a child, and is called "child lock" or "tamper proof".

[0016]

As described above, when a cassette is accidentally inserted in the erroneous operation prevention mode, the cassette is automatically forcibly prohibited from being inserted. Involuntarily,
Press the cassette inserted into the cassette slot firmly or forcibly.

Even if the user designates the erroneous operation prevention mode, if the user forgets that, the user may inadvertently push the cassette strongly. When another person other than the user who specified the error prevention mode operates,
If the user does not notice the lighting of the erroneous operation prevention mode display LED 9, the cassette may be pushed in strongly. In particular, V
If the installation status of the TR is bad or the viewing angle is inappropriate, the lighting state of the erroneous operation prevention mode display LED 9 is often unknown.

In the case where the cassette is strongly pushed in despite the erroneous operation prevention mode,
There is a possibility that mechanical parts of the cassette unit 1, for example, a cam or lever for turning on / off the cassette insertion detection switch 3, a gear, a rack or a lever interlocked with the insertion / ejection motor 2, may be damaged.

The present invention has been made in view of the above circumstances, and is intended to prevent mechanical parts of a cassette unit from being damaged even if a cassette is accidentally inserted in an erroneous operation prevention mode for cassette insertion. The purpose is to do.

[0020]

A first cassette insertion / ejection processing apparatus according to the present invention automatically inserts a cassette based on detection of insertion of a cassette and automatically ejects a cassette based on an ejection operation. A cassette insertion / ejection processing device having a function of performing operation and preventing erroneous operation, wherein when the erroneous operation prevention mode is set and when it is detected that a cassette has been inserted, insertion of the cassette is permitted and ejection operation is performed. A means for prohibiting the reception of operations other than the above.

Also, the second cassette insertion and insertion device according to the present invention
The ejection processing device is a cassette insertion / ejection processing device having a function of automatically inserting a cassette based on detection of insertion of a cassette and automatically ejecting a cassette based on an ejection operation and corresponding to prevention of erroneous operation. When the erroneous operation prevention mode is set and when it is detected that the cassette has been inserted, a means for once permitting insertion of the cassette and thereafter discharging the cassette is provided.

In the first or second cassette insertion / ejection processing apparatus, a warning sound generating means is added, and the warning sound generating means is operated when a cassette is inserted in the erroneous operation prevention mode. It is possible to do.

[0023]

According to the first cassette insertion / ejection processing device,
If a cassette is accidentally inserted even though the erroneous operation prevention mode is set, the insertion of the cassette is positively permitted, thus avoiding a strong push that would otherwise occur due to forced insertion being prohibited. I do. Then, since the acceptance of operations other than the ejection operation is prohibited, erroneous operations are substantially prevented.

According to the second cassette insertion / ejection processing apparatus, in the case of unexpected cassette insertion similar to the above,
Once insertion is permitted, a strong push that accompanies forced insertion as in the conventional example is avoided. Then, since the cassette is automatically ejected after the insertion, the erroneous operation is substantially prevented, and the user is informed of the erroneous operation.

When the warning sound generating means is provided,
Even if the illuminator (LED, arc tube, etc.) that indicates the erroneous operation prevention mode is not visible due to the installation conditions of the equipment, a warning sound is emitted if the cassette is inserted when the erroneous operation prevention mode is set. The fact that the erroneous operation prevention mode is set will be clearly notified through hearing.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cassette insertion / ejection processing apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing a schematic configuration of a main part of a cassette insertion / ejection processing apparatus according to an embodiment.

In the drawing, 1 is a cassette unit in a video tape recorder (VTR), and 2 is an insertion / ejection motor for inserting / ejecting a cassette on a cassette support frame via a transmission mechanism (not shown) by forward / reverse rotation. Reference numeral 3 denotes a cassette insertion detection switch that is turned on when the cassette is inserted into the cassette insertion slot (OFF when the cassette is ejected from the cassette storage unit), and reference numeral 4 denotes a cassette that is turned on when the cassette is inserted into the cassette storage unit. Insertion completion detection switch, 5 is a microcomputer, 5a to 5c are input ports, 5d to 5f are output ports, 6 is a motor driver for driving the insertion / ejection motor 2 in the normal / reverse direction, 7 is an erroneous operation prevention switch for child lock, 8 is a PNP type LED drive transistor, 9 is LE
The LED 10 for displaying an erroneous operation prevention mode connected to the collector of the D drive transistor 8 is an electronic buzzer for generating a warning sound.

Although only an electronic buzzer 10 is added in terms of hardware as compared with the conventional example, the software in the microcomputer 5 has a different configuration from the conventional example. The software will be described below in the first and second two embodiments. , B. This will be described. Note that the first embodiment A. Then the electronic buzzer 1
0 is not used.

A. First, the operation of the first embodiment will be described with reference to the flowchart of FIG.

Normally, the erroneous operation prevention switch 7 is kept OFF. At this time, since the base of the PNP-type LED drive transistor 8 is connected to the DC power supply + B, the PNP-type LED drive transistor 8 is in a non-conductive state, and the erroneous operation prevention mode display LED is provided.
9 is off. The input port 5b of the microcomputer 5 is at "H" level.

It is assumed that the user switches the erroneous operation prevention switch 7 to the ON state in order to prevent erroneous operations such as overwriting and recording by using a cassette already recorded by a child against his / her own intention. Then, since the base of the LED drive transistor 8 is grounded via the erroneous operation prevention switch 7 and becomes conductive, the LED drive transistor 8 becomes conductive,
The erroneous operation prevention mode display LED 9 is turned on. Also, the input port 5b becomes "L" level.

The output port 5f of the microcomputer 5 is normally kept at "H" level, and the electronic buzzer 10
Is inactive.

When a cassette is manually inserted from the cassette insertion slot on the front of the VTR (step S1), the cassette insertion detection switch 3 is turned on (active), and the microcontroller previously set at the "H" level by the DC power supply + B. Since the input port 5a of the computer 5 is inverted to "L" level, the microcomputer 5
Recognizes that the cassette has been inserted (step S
2). Then, the microcomputer 5 starts the operation of inserting the cassette toward the cassette storage part for the time being. That is, a forward rotation command signal is transmitted from the output port 5d to the motor driver 6, and the motor driver 6
To rotate the insertion / ejection motor 2 forward. Electric power is supplied to the motor 2 from the motor driver 6. Then, the cassette support frame is moved via a transmission mechanism (not shown) in the cassette unit 1, and the cassette is automatically inserted into the cassette storage unit (Step S).
3).

This automatic insertion operation of the cassette is executed regardless of whether the erroneous operation prevention switch 7 is on or off, and whether the erroneous operation prevention mode display LED 9 is off or on. You.

When the insertion of the cassette into the cassette storage section is completed, the cassette insertion completion detection switch 4 provided in the cassette storage section is turned on (active), and the input port 5c is inverted to the "L" level. Then, the microcomputer 5 recognizes the completion of the insertion of the cassette and stops the insertion / ejection motor 2 via the motor driver 6 for the time being (step S4).

Next, the microcomputer 5 reads the state of the input port 5b and determines whether the erroneous operation prevention switch 7 is ON (incorrect operation prevention mode) or OFF (normal mode) (step S5).

[1] Normal Mode When the erroneous operation prevention switch 7 is in the OFF state (normal mode), the input port 5b is at "H" level.
The microcomputer 5 holds the cassette insertion completed state. That is, the stopped state of the insertion / ejection motor 2 is maintained as it is (step S6). Thus, a normal cassette insertion operation is performed.

When the cassette discharge operation is performed in the normal mode with the cassette stored in the cassette storage section, the microcomputer 5 sets the output port 5e.
Sends a reverse rotation command signal to control the motor driver 6 to rotate the insertion / ejection motor 2 in the reverse direction and eject the cassette in the cassette storage section toward the cassette insertion slot.

[2] Erroneous Operation Prevention Mode The erroneous operation prevention switch 7 is ON (erroneous operation prevention mode).
At this time, since the input port 5b is at the "L" level, the microcomputer 5 starts the operation of discharging the cassette in the cassette storage section toward the cassette insertion slot. That is, a reverse rotation command signal is sent from the output port 5e to the motor driver 6, and the motor driver 6
Is controlled to reverse the insertion / ejection motor 2. Then, the cassette support frame is moved via a transmission mechanism (not shown) in the cassette unit 1, and the cassette is automatically ejected from the cassette storage section toward the cassette insertion slot (step S7).

With the completion of the ejection of the cassette, the cassette insertion detecting switch 3 is inverted from the ON state to the OFF state, and the input port 5a is inverted to the "H" level.
The microcomputer 5 recognizes that the ejection of the cassette has been completed (step S8). Then, the microcomputer 5
Stops the insertion / ejection motor 2 via the motor driver 6 (step S9).

As described above, the erroneous operation prevention switch 7 is
When the cassette is inserted in the N state, the insertion of the cassette is allowed once instead of forcibly prohibiting the insertion of the cassette as in the conventional example. No mechanical parts are damaged. Then, since the cartridge is returned to the cassette insertion slot by the discharging operation, child mischief can be substantially prevented, and the user can be informed of an erroneous operation.

By the way, if only mechanical parts of the cassette unit 1 are to be prevented, the cassette may be positively inserted instead of forcibly prohibiting the insertion of the cassette. However, erroneous operation prevention switch 7 is ON
As long as it is in the state (misoperation prevention mode),
The microcomputer 5 must not accept any operation other than the discharging operation. In this case, softwarely, in FIG. 2, the determination in step S5 is affirmative (YE
In the case of S), a process of prohibiting the reception of an operation other than the ejection operation may be performed instead of steps S7 to S9. In addition, the electronic buzzer 1
A warning may be issued by sounding 0 to indicate an erroneous operation.

B. Next, the second using the electronic buzzer 10
The operation of this embodiment will be described with reference to the flowchart of FIG.

When a cassette is manually inserted from the cassette insertion slot (step T1), the cassette insertion detection switch 3 is turned on (active), and the input port 5a is inverted to "L" level. The insertion is recognized (step T2).

Next, the microcomputer 5 reads the state of the input port 5b and determines whether the erroneous operation prevention switch 7 is ON (incorrect operation prevention mode) or OFF (normal mode) (step T3).

(1) Normal mode When the erroneous operation prevention switch 7 is in the OFF state (normal mode), the input port 5b is at "H" level.
The microcomputer 5 sends a forward rotation command signal from the output port 5d to the motor driver 6, controls the motor driver 6 to rotate the insertion / ejection motor 2 forward, and moves the cassette support frame via the transmission mechanism. The cassette is moved and the cassette is automatically inserted into the cassette storage section (step T4). With the completion of the insertion of the cassette into the cassette storage section, the cassette insertion completion detection switch 4 is turned on (active), and the input port 5c is inverted to the "L" level, so that the microcomputer 5 recognizes the completion of the insertion of the cassette. (Step T5). Then, the microcomputer 5 stops the insertion / ejection motor 2 via the motor driver 6 (step T6). Thus, a normal cassette insertion operation is performed.

When the cassette discharge operation is performed in the normal mode with the cassette stored in the cassette storage section, the microcomputer 5 sets the output port 5e.
Sends a reverse rotation command signal to control the motor driver 6 to rotate the insertion / ejection motor 2 in the reverse direction and eject the cassette in the cassette storage section toward the cassette insertion slot.

(2) Erroneous Operation Prevention Mode The erroneous operation prevention switch 7 is ON (erroneous operation prevention mode).
At this time, since the input port 5b is at the "L" level, the microcomputer 5 inverts the output port 5f to the "L" level, sounds the electronic buzzer 10, and starts generating a warning sound (step S1). T7). After the electronic buzzer 10 sounds as described above, the microcomputer 5 sends out a forward rotation command signal from the output port 5d, controls the motor driver 6, rotates the insertion / ejection motor 2 forward, and puts it in the cassette storage section. Then, the insertion of the cassette is started (step T8). When the insertion of the cassette into the cassette storage section is completed, the cassette
Since the input port 5c is in the N state and the input port 5c is inverted to the "L" level, the microcomputer 5 recognizes the completion of the insertion of the cassette (step T9). Then, the microcomputer 5 temporarily stops the insertion / ejection motor 2 via the motor driver 6 (Step T10).

As described above, the erroneous operation prevention switch 7 is turned on.
Even in the state (erroneous operation prevention mode), the cassette is positively inserted to prevent the mechanical parts of the cassette unit 1 from being damaged.

Next, the microcomputer 5 sends out a reverse rotation command signal from the output port 5e, controls the motor driver 6 to reverse the insertion / ejection motor 2, and directs the insertion / ejection motor 2 toward the cassette insertion slot of the cassette in the cassette storage section. The discharge is started (step T11). The cassette insertion detection switch 3 is turned on when the cassette is completely ejected.
As a result of the inversion from the state to the OFF state, the input port 5c is inverted to the “H” level.
Recognizes the completion of ejection of the cassette (step T12).
Then, the microcomputer 5 includes the motor driver 6
Then, the insertion / ejection motor 2 is stopped via (step T13). Then, by returning the output port 5f to the “H” level, the generation of the warning sound from the electronic buzzer 10 is stopped. The electronic buzzer 10 keeps sounding during the period from step T7 to step T14 as shown by the broken line.

The sound may be emitted continuously or intermittently at a predetermined period (for example, 1 Hz).

As described above, the erroneous operation prevention switch 7 is
When the cassette is inserted in the N state, the cassette is once inserted and ejected while the electronic buzzer 10 is sounding, so that the mechanical parts of the cassette unit 1 are substantially prevented from being damaged. In addition to preventing mischief of the child, the warning sound based on the sound of the electronic buzzer 10 can inform the user that the current operation status is not normal.

[0054]

According to the first cassette insertion / ejection processing apparatus, even if a cassette is unexpectedly inserted when the erroneous operation prevention mode is set, the cassette unit is positively allowed to be inserted, thereby constituting the cassette unit. This can prevent the mechanical parts from being damaged. Further, since the acceptance of operations other than the ejection operation is prohibited, erroneous operations can be substantially prevented.

According to the second cassette insertion / ejection processing apparatus, in the case of an unexpected cassette insertion similar to the above, once the cassette is allowed to be inserted, the mechanical parts of the cassette unit can be prevented from being damaged, and once the cassette has been inserted. Since the cassette is automatically ejected in the next stage, erroneous operation can be substantially prevented, and the user can be informed that the operation has been erroneous.

It should be noted that if a cassette is inserted when the erroneous operation prevention mode is set, a warning sound is issued,
Even if you cannot see the illuminator (LED, arc tube, etc.) that indicates the erroneous operation prevention mode due to the installation conditions of the equipment,
It is possible to clearly notify the user through hearing that the erroneous operation prevention mode is set.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of a main part of a cassette insertion / ejection processing device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the first embodiment;

FIG. 3 is a flowchart for explaining the operation of the second embodiment;

FIG. 4 is a circuit diagram showing a schematic configuration of a main part of a cassette insertion / ejection processing device according to a conventional example.

FIG. 5 is a flowchart for explaining the operation of the conventional example.

[Explanation of symbols]

 Reference Signs List 1 cassette unit 2 insertion / ejection motor 3 cassette insertion detection switch 4 cassette insertion completion detection switch 5 microcomputer 6 motor driver 7 erroneous operation prevention switch 8 LED drive transistor 9 erroneous operation prevention mode display LED 10 electronic buzzer for generating warning sound

Claims (3)

(57) [Claims] 1. A cassette insertion / ejection processing apparatus having a function of automatically inserting a cassette based on detection of insertion of a cassette and automatically ejecting a cassette based on an ejection operation, and corresponding to prevention of erroneous operation. And a means for permitting the insertion of the cassette when the erroneous operation prevention mode is set and detecting that the cassette has been inserted, and prohibiting the reception of operations other than the ejection operation. -Discharge processing device. 2. A cassette insertion / ejection processing apparatus having a function of automatically inserting a cassette based on detection of insertion of a cassette and automatically ejecting a cassette based on an ejection operation and corresponding to prevention of erroneous operation. A cassette insertion / ejection processing device comprising means for once permitting insertion of a cassette when the misoperation prevention mode is set and detecting that a cassette has been inserted, and thereafter ejecting the cassette. . 3. The cassette insertion / ejection processing apparatus according to claim 1, further comprising a warning sound generating means, and operating the warning sound generating means when the cassette is inserted in the erroneous operation prevention mode. A cassette insertion / ejection processing device characterized by having such a configuration.