JPH0782686B2 - Recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention guides and loads a recording or reproducing apparatus, particularly a cassette accommodating a recording medium, and records a signal on the recording medium in which the loading is completed. Alternatively, it relates to a device for reproducing.

<Prior Art> Conventionally, as a device of this type, for example, there is a helical scan type VTR, but in this specification, a VTR of this type is used.
This will be explained using TR as an example.

Generally, in this type of VTR, a VTR that records and plays television broadcasting, which is called a stationary type, has a function to automatically guide the cassette holder from the position where the cassette is inserted by the user to the position where recording and playback are possible. Things are common. For example, the so-called front loading mechanism guides the cassette and the holder that holds the cassette to a predetermined position inside the VTR by simply inserting the cassette into the insertion slot, and loads the cassette, and at this position, the so-called tape loading mechanism. The tape in the cassette is wrapped around a rotating drum for recording and playback.

By the way, in this type of device, the cassette is inserted by the user, and it is detected that the holding member (cassette holder) holding the cassette has moved a predetermined distance from the initial position, and the cassette holder is moved. Automatic cassette loading. Therefore, it is necessary to detect the position moved by the predetermined distance. Further, since the movement of the cassette holder must be stopped when the cassette loading is completed, it is necessary to detect the position of the cassette holder when the cassette loading is completed.

When taking out the cassette easily when taking out the cassette, it is necessary to return the cassette holder to the above initial position and then stop the movement of the cassette holder, so it is necessary to detect that the cassette holder is at the initial position. .

<Problems to be Solved by the Invention> Since the positions of the plurality of cassette holders as described above are distant from each other on the device, when the detection switch is attached to the device main body side, a code (wire) for obtaining a signal from the detection switch
The length is long, which is troublesome in constructing a VTR, and hinders the reduction in size and weight of the device.

Further, when the switch is attached to the cassette holder, only one switch is required, but when the wire is attached to the movable holder, the wire also moves, which is not preferable.

In view of the above problems, it is an object of the present invention to provide a recording or reproducing apparatus that can detect a plurality of positions of a cassette holding member because the wire length is short and there is no need to move the wire. .

<Means for Solving Problems> In order to achieve the above-mentioned object, the present invention inserts and loads a cassette containing a recording medium into the main body of the apparatus, and sends a signal to the recording medium in the loaded cassette. In the apparatus for recording or reproducing the recording medium, a movable holding member for holding the cassette, a drive mechanism for moving the holding member between a cassette insertion position and a loading completion position, and a movement of the holding member. Of the rotating member and the holding member
First, second and third switches for detecting one position, and first, second and third projections provided on the rotary plate by contacting the first, second and third switches to turn them on. And the first, second, third
Switch is provided on the same substrate fixed to the chassis of the device, and the first and third protrusions are arranged so as to sandwich the first, second and third switches, and Two
The protrusion of is disposed between the first and third protrusions,
With the insertion of the cassette, the rotary plate rotates in the first direction, the first switch is switched from on to off, and the second switch is switched from off to on, The holding member is moved from the cassette insertion position to the loading completion position by the driving mechanism, the movement operation of the holding member is stopped when the third switch is switched from OFF to ON, and the cassette eject command is issued. When this is done, the holding member is moved from the loading completion position to the cassette insertion position by the drive mechanism, and the rotary plate rotates in the second direction different from the first direction, so that The moving operation of the holding member is stopped when the switch is switched from off to on.

Example An example of the present invention will be described below.

FIG. 4 is a cassette holder of a VTR as an embodiment of the present invention, and FIG. 5 is a diagram showing a drive mechanism of the cassette holder shown in FIG. In the figure, 10 is a holder main body, 11 is a bent portion on the cassette insertion side, 12a, 12b are stoppers for locking the end of the cassette, 13a, 13b are side walls integrally formed with the holder main body 10, 14a, 14b, Reference numerals 15a and 15b are drive shafts driven by a cassette drive mechanism.

In FIG. 5, 21 is a drive mechanism main body, and 22a and 22b are main body 2 respectively.
The above-mentioned drive shafts 14a, 15a formed on the side plate 23 of 1
Is a guide groove into which is fitted. Note that guide grooves 22c and 22d are similarly formed on the side plate 24 opposite to the side plate 23. Reference numeral 25 denotes a motor, and the rotation of the motor 25 is transmitted to the rotary plate 28 via the idlers 26 and 27. Reference numeral 29 denotes a connecting rod that connects the outer diameter portion of the rotary plate and the drive shaft 14a.When the rotary plate 28 rotates counterclockwise, the drive shaft 14a moves in the direction of arrow 30 in the figure via the connecting rod 29. To do. In addition, each shaft 14a, 15a,
14b and 15b move along the guide grooves 22a, 22b, 22c and 22d, respectively.

Reference numeral 31 is a window for covering the cassette insertion opening 3, which is rotatably supported by both side plates 23 and 24. The cassette is inserted by the user through the window 31 and brought into contact with the stopper 12a of the main body of the hodder. When the cassette is further pressed in the insertion direction, a switch described later is turned on, and the motor 25 is driven to guide the drive shaft 14a along the guide groove 22a in the direction of the arrow 30 to move the cassette holder body 10 in the insertion direction. Move down to complete cassette loading.

FIGS. 1A to 1E are views for explaining the position detecting mechanism of the cassette holder. Reference numeral 50 denotes a rotary plate which is provided on the side plate and rotates similarly to the rotary plate 28, and a projection 6 for pressing the contact pieces 51, 52, 53 of the switches SW ₁ , SW ₂ , SW _{3 on} the disk surface thereof.
1,62,63 are provided. Reference numeral 60 is a substrate on which SW ₁ , SW ₂ and SW ₃ are provided.

Before the cassette is inserted, the rotary plate 50 is in the state shown in FIG. 1 (A), and only SW ₁ is turned on. The cassette is brought into contact with the stoppers 12a, 12b of the holder 10 and the holder 10
When the rotation of the rotating plate 50 starts,
The state of 50 becomes as shown in FIG. 1 (B) and SW ₁ is turned off. Then, when the holder 10 is further pushed in, the rotating plate 50 is brought into the state of FIG. 1 (C) this time, and SW ₂ is turned on. When SW ₂ is turned on, the motor 25 starts rotating,
The automatic loading of the holder 10 is started.

The state of the rotary plate 50 being loaded is shown in FIG. 1 (D), and the state of the rotary plate 50 in the fully loaded state is shown in FIG. 1 (E). That is, when loading of the cassette is completed, SW ₃ is turned on, and by turning on this SW ₃ , the rotation of the motor 25 is stopped.

When a cassette take-out switch (not shown) is pushed when the cassette is taken out, the motor 25 rotates in the direction opposite to that at the time of loading, and the rotary plate 50 rotates in the opposite direction.
Then, the rotary plate 50 moves to the position shown in FIG.
_{When 1} is turned on, the motor 25 stops and the cassette returns to the position where it can be taken out.

That is, the switch SW ₁ is turned on when the holder 10 is at a position where the cassette can be taken out, and the switch SW ₂ is turned on when the stroke holder 10 is moved in the insertion direction from the position where SW ₁ is turned on. SW ₃ turns on when the holder is at the position where the cassette has been loaded.

FIG. 2 shows details of the motor control circuit. 71 is a terminal to which a clock of a predetermined frequency is supplied, 72, 73 and 74 are terminals to which a high signal is supplied when the switches SW ₁ , SW ₂ and SW ₃ are on, and a low signal is supplied when they are off. 70 is a terminal to which a pulse is supplied at the time of an eject command.

Reference numeral 75 is an OR gate, which detects a state in which all of SW ₁ , SW ₂ , and SW ₃ are turned off. The counter 76 is in this state.
That is, it is a counter for measuring the period in the state shown in FIG. 1 (B), and the output of this counter 76 is latched by the latch circuit 77 when it goes from FIG. 1 (B) to FIG. 1 (C). To be done. That is, the latch circuit 77 performs the latch at the ON timing of the switch SW ₂ .

The meaning of the data latched by this latch circuit 77 is
It shows the period in the state of FIG. 1 (B) at the time of shifting from the state of FIG. 1 (A) through the state of FIG. 1 (B) to the state shown in FIG. 1 (C). If this period is very short, it is determined that the cassette has been rapidly inserted and pressed by the user. The comparator 78 is this latch circuit 77.
Compare the data latched with and the predetermined data D _A
If D _A is larger, it outputs high level. When the output of this comparator is at a high level, the rotation of the motor 25 is prohibited, and the motor 25 is driven in the reverse direction to prohibit the cassette loading. For example, D _A is set to correspond to a few hundredths of a second.

As a result, the cassette holder and the cassette can be prevented from being damaged by loading the cassette after the cassette is suddenly pushed in.

By the way, reference numeral 35 in FIG. 5 designates a projection abutting against the taper 4 of the cassette 1, which is intended to prevent erroneous insertion of the cassette when there is no taper 4. Reference numeral 36 is an elastic member for urging the projection 35 in the cassette pressing direction. The window 31 is also urged in the closing direction in FIG.

However, due to the above-mentioned biasing, the state shown in FIG. 1 (C) may return to the state shown in FIG. 1 (B) even when the cassette is inserted. Since the cassette loading is started when the state shown in FIG. 1 (C) is reached, if the state is returned to the state shown in FIG. 1 (b), the cassette may not be held in the holder, and the cassette may not be held. The holder 10, the cassette 1, etc. may be damaged.

Therefore, if the state shown in FIG. 1 (C) does not continue for a predetermined period or longer, the drive of the motor is not started. Counter 80 SW ₂ in used for measuring the period after SW ₂ is turned on is off is reset. Therefore, after SW ₂ is turned on, if the on state is maintained for a predetermined period, the output of the comparator 82 turns to a high level and the motor is driven for the first time, and the cassette automatic loading is started. This can solve the above problem.

FIG. 3 is a flow chart showing the operation of the controller 83 of FIG. In this flow chart, the forward rotation of the motor means the rotation of the cassette in the loading direction, and the reverse rotation means the rotation of the cassette in the ejection direction.

Since the switch SW ₁ to SW ₃ on accompanied connexion same substrate with the rotation of the rotating plate, according to the above such configuration detects the three positions of the cassette holder by turning on and off, is fixed to the device with three positions Since it can be detected by connecting the cord to only one board, it is extremely effective in simplifying the apparatus and reducing the size.

<Effects of the Invention> As described above, according to the present invention, since a plurality of positions of the cassette holding member can be realized by an extremely simple mechanism and the wire is not drawn, there is no accident such as wire breakage. It is also very effective in extending the life of the device.

Further, since the three switches are arranged on one board, the device can be downsized.

Furthermore, since the first and third projections provided on the rotary plate are arranged so as to sandwich the first, second and third switches to determine whether to stop the movement of the cassette holding member, the first, second and third projections are arranged. The switches can be arranged close to each other, further downsizing can be achieved, and the movement stroke of the first and third protrusions can be increased.

Furthermore, when the first switch is switched from on to off and the second switch is switched from off to on, the holding member is moved from the cassette insertion position to the loading completion position by the drive mechanism. Therefore, after the first switch is switched from on to off, the second switch
If the time it takes for the switch to switch from off to on is very short, it can be determined that the cassette has been rapidly inserted. In this case, by stopping the loading of the cassette, the cassette and the device can be stopped. It is possible to prevent the damage of the.

[Brief description of drawings]

1 (A) to 1 (E) are views showing a holder position detecting mechanism, FIG. 2 is a view showing a motor control circuit according to the present invention, and FIG. 3 is a flow showing an operation of the controller in FIG. FIG. 4 is a view showing a cassette holding member, and FIG. 5 is a view showing a holder driving mechanism. SW ₁ , SW ₂ , and SW ₃ are holder position detecting switches, 25 is a motor, 50 is a rotating plate, 60 is a substrate on which the switches SW _{1 to} SW ₃ are provided, 83 is a controller, and 84 is a motor control circuit.

Front page continuation (72) Inventor Takahide Sasaki Kanagawa Prefecture, Kawasaki City, Takatsu-ku, 770 Shimonoge, Canon Inc.Tamagawa Plant On-site (56) References JP 60-5464 (JP, A) JP 56-156961 (JP, A)

Claims (1)

[Claims] 1. A device for inserting or loading a cassette containing a recording medium into a main body of an apparatus, and recording or reproducing a signal to or from a recording medium in the cassette, which has been loaded, which holds the cassette. A movable holding member, a drive mechanism that moves the holding member between a cassette insertion position and a loading completion position, a rotating plate that rotates in conjunction with the movement of the holding member, and three positions of the holding member. The first, second, and third switches for detecting, and the first, second, and third protrusions provided on the rotary plate that are brought into contact with the first, second, and third switches to turn on. And the first, second and third switches are provided on the same substrate fixed to the chassis of the device, and the first and third protrusions are the first, second and third switches. The second protrusion is disposed so as to sandwich the switch, and the second protrusion is disposed between the first and third protrusions. When the rotary plate rotates in the first direction with the insertion of the cassette, the first switch is switched from on to off, and the second switch is switched from off to on. , The holding member is moved from the cassette insertion position to the loading completion position by the driving mechanism, and the movement operation of the holding member is stopped when the third switch is switched from OFF to ON, and the cassette eject is performed. When a command is given, the holding member is moved from the loading completion position to the cassette insertion position by the drive mechanism, and the rotary plate rotates in the second direction different from the first direction, The recording or reproducing apparatus, wherein the moving operation of the holding member is stopped when the first switch is switched from off to on.