JPS6329355A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To detect plural positions of a cassette holder by a single switch by providing the single switch driven by plural cams provided to a rotary disk and using the switch so as to detect the plural positions of the cassette holder. CONSTITUTION:The switch SW of the rotary disk 50 before a cassette is loaded is turned off and when the loading of the cassette 2 is started, the rotary disk 50 is driven clockwise and a cam 62 turns on the switch SW. When the rotary disk 50 is driven by a prescribed angle through the loading, the cam 62 of the disk 50 is removed from the switch SW and the switch SW is turned off. Simultaneously, a motor 25 is started to drive the cassette holder, the disk 50 is driven further clockwise, the switch SW is turned on by the cam 63, the state is restored by the reversing of the motor, which is stopped. The plural positions of the cassette holder are detected by a single switch in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording or reproducing device, in particular, to guide and load a cassette containing a recording medium into the main body of the device, and to remove the recording medium in the loaded cassette. The present invention relates to a device for recording or reproducing signals.

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

In general, this type of VTR, especially the so-called stationary type VTR that records and plays back television broadcasts, has a function that automatically guides the cassette holder from the position where the user inserts the cassette to the position where recording and playback is possible. Things are common. For example, by simply inserting a cassette into the insertion slot using a so-called front loading mechanism, the cassette and the holder that holds the cassette are guided to a predetermined position within the VTR body, loaded, and at this point, the so-called tape rope ink AA is loaded. The tape in the cassette is wound around a rotating drum for recording and playback.

By the way, in this type of device, when a cassette is inserted by a user, a holding member (cassette holder) that holds the cassette moves a certain distance from its initial position, and the cassette holder is moved. Automatically loads the cassette.

Therefore, it is necessary to detect the position moved by the predetermined distance. Furthermore, since the movement of the cassette holder must be stopped when loading of the cassette is completed, it is necessary to detect the position of the cassette holder when loading of the cassette is completed.

Furthermore, when taking out the cassette, considering the ease of taking out the cassette, it is necessary to return the cassette holder to the above-mentioned 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 plurality of cassette holders as described above are located at different positions on the device, when a detection switch is installed on the device main body side, a cord (wire) is used to obtain a signal from the detection switch.
This increases the length, which makes the parts of the VTR cumbersome and prevents the device from being made smaller and lighter.

Furthermore, if 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-mentioned problems, the present invention provides a recording or reproducing device that has a short wire length, does not require moving the wire, and can detect multiple positions of a cassette holder with a single switch. With the goal.

Means for Solving the Problems〉 For this purpose, in the recording or reproducing apparatus of the present invention, a cassette containing a recording medium is inserted and loaded into the apparatus main body, and the loaded cassette is removed. A device for recording or reproducing signals on a recording medium contained in the cassette, the device comprising: a movable holding member that holds the cassette; a drive mechanism that moves the holding member between a cassette insertion position and a loading completion position; The configuration includes a rotary plate that rotates in conjunction with the movement of the holding member, and a single switch that is turned on and off by a plurality of cams provided on the rotary plate, and the switch detects a plurality of positions of the cassette holder. There is.

By configuring as described above, the wire only needs to be connected to the fixed part, and the rotational phase of the rotary plate can be detected in an extremely small part, so the wire length is short and the wire is highly reliable. A compact recording or reproducing device is obtained.

<Example> An embodiment of the present invention will be described below.

FIG. 4 is a diagram showing 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. 4. In the figure, 10 is a holder main body, 11 is a bent portion on the cassette insertion side, and 12a.

12b is a stopper for locking the end of the cassette;
3a and 13b are side walls integrally molded with the holder main body io;
14a, 14b, 15a, and 15b are drive shafts driven by a cassette drive mechanism, respectively.

In FIG. 5, 21 is a drive mechanism main body, 22a.

22b is a guide groove formed in the side plate 23 of the main body 21, into which the aforementioned drive shafts 14a and 15a fit. Note that a guide groove 22 is also provided on the side plate 24 opposite to the side plate 23.
c, 22d are formed, and the guide grooves 22c, 22d are formed.
2d has a shaft 14b.

15b is fitted. 25 is a motor, and the rotation of the motor 25 is transmitted to the rotating plate 28 via idlers 26 and 27. Reference numeral 29 denotes a connecting lever that connects the outer diameter part 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 connection s29. do. Further, the rotation of the rotary plate 28 is transmitted to the rotary plate 50 rotatably attached to the side plate 24 via a gear 37, a rotation shaft 38 of the gear 37, and a gear 39, and a lever provided on the rotary plate drive shirt) 14b. Along with this, each shaft 14a, 15a, 14b.

15b are guide grooves 22a, 22b, and 22c, respectively.

22d.

A window 31 covers the cassette insertion opening 3, and is rotatably supported by both side plates 23 and 24. The cassette is inserted by the user through the window 31 and comes into contact with the stopper 12a of the holder body. Then, when the cassette is further pressed in the insertion direction, the motor 25 is driven by a switch to be described later, and the driving shirt 14a is guided in the direction of the arrow 30 along the guide groove 22a, so that the cassette holder main body 10 moves in the insertion direction and then moves downward. Move to complete loading the cassette.

Figures 1 (A'), (B), and (C) are diagrams for explaining the position detection mechanism of the cassette holder, in which the rotation phase and switch of the rotary plate 50 mentioned above are shown on the left side, and the switch is shown on the right side. The positions of the cassettes relative to the VTR are shown.

Cams 61 and 62 are provided on the disc surface of the rotary plate 50 to press the switch SW to turn it on and off. It is also assumed that this switch SW is attached to a substrate (not shown) fixed to the side plate 24.

Before the cassette is inserted, the rotary plate 50 is in the state shown in FIG. 1(A), and the switch SW is in the off state. When insertion of the cassette 2 is started, the rotary plate 50 rotates clockwise in the figure, and the cam 62 turns on the switch SW.

When the rotary plate 50 is rotated by a predetermined angle due to this insertion, the rotary plate 50 becomes in a state as shown in FIG. 1 (CB), the cam 62 is removed from the switch SW, and the switch SW is turned off. As will be described later, when the cassette is inserted into the state shown in FIG. 1(B), the motor 25 is activated and the driving of the cassette holder is started. By driving this cassette holder,
The rotary plate 50 further rotates clockwise, and when the state shown in FIG. 1(C) is reached, the switch SW is turned on by the cam 63. At this time, loading of the cassette is completed, and the motor 25 stops as described later.

On the other hand, when the injection switch is turned on in the state shown in FIG. 1(C), the rotation of the motor 25 in the opposite direction returns to the state shown in FIG. 1(A) via the state shown in FIG. 1CB). Motor 25 is stopped.

Figure 2 shows the control circuit of the motor 25, Figure 3 (A),
CB) is a timing chart for explaining the operation of the control circuit. Figure 3 (A) shows when the cassette is inserted, the third
Figure CB) shows the situation when the cassette is taken out, in which SW indicates the on/off state of the switch, MOTOR indicates the driving state of the motor, and S1 to S7 indicate the waveforms in the second figure.

When the power is turned on to the VTR by turning on the power switch 95, the signal output from the power supply circuit 96 becomes a high level, and is output to the monomulti (M, M , ) 92 is triggered, and the output of the monomulti 92 resets the counters 86 and 87 via the OR gate 90.

Now, when the power is turned on, if no cassette is inserted, the switch SW is off, and if a cassette has been loaded, the switch SW is on. Therefore, the output of the monomulti 92 causes the latch circuit 91 to reach a high level (
The high (Hi) signal is latched. The level of the signal indicated by 31 in the figure is Hi when the switch SW is turned on by inverting the low level (Lo) based on the ground by the in/beta 82, and when it is turned off it is High through the resistor 80. By inverting the high level (Hi) based on the power supply voltage with the inverter 82, it becomes LO.

The output of the latch circuit 91 is supplied to a switch 97 and a motor drive circuit 89, and the motor drive circuit 89 drives the motor 25.
In other words, the output of the latch circuit 91 is a signal for switching the mode of this control circuit between cassette insertion and cassette removal.

First, assuming that the switch SW is in the OFF state, the operation when inserting a cassette will be described with reference to FIG. 3(A).

The cassette 2 is inserted by the user, and the rotary plate 50 is placed in the first position.
When the state shown in FIG.
It changes to Hi.

Inverters 83, 84 and exclusive OR circuit (EXOR
) 85 receives this signal S1.
edge is detected and input to counters 86 and 87. Incidentally, the inverters 83 and 84 act as minute time delay circuits, as is clear from 52 in FIG. 3(A).

When the counters 86 and 87 count 3 and 2 pulses, respectively, they output the Q output of Hl. Therefore, when the rotary plate 50 enters the state shown in FIG.
A second pulse appears at the output S3 of 85, and the counter 87
Q output changes to Hi. At this time, the switch 97 is connected to the L side, the flip-flop (FF) 88 is set, and its output S7 becomes Hi. FF88 output S
7 is supplied to the motor drive circuit 89 to start driving the motor 25.

Then, the cassette is loaded by this motor 25,
When the rotating plate 50 is in the state shown in FIG. 1(C), EXOR
The third pulse is output from the counter 85, and the Q output of the counter 86 becomes Hi. The FF 88 is reset by the Q output S5 of the counter 86, S7 becomes LO, the motor drive by the remoter drive circuit 89 is stopped, and the loading of the cassette is completed. At this time, the counters 86 and 87 are reset by the Q output of the counter S5, and the latch pulse is supplied to the latch circuit 91. As a result, the latch circuit 91 latches the Hl signal, and the cassette ejecting state is entered.

Next, the operation when taking out the cassette will be explained.

When the inject switch 98 is operated after the loading of the cassette is completed, the output of this switch 98 is set to the FF 88 via the H side terminal of the switch 97, and the remote drive circuit 89 sets S7 to Hi. motor 2
5 starts driving the cassette holder. The rotating plate 50 is shown in FIG. 1(C).

During the period from the state shown in CB) to the state shown in FIG. 1(A), the EXOR 85 outputs three pulses as shown in FIG. 3(B), and the Q output S5 of the counter 86
becomes Hi. Along with this, FF88 is reset,
When 57<Lo, the motor 25 stops in the state shown in FIG. 1(A). At this time, the counter 86,
87 is reset, and the latch circuit 91 latches Lo, thereby returning to the cassette loading standby state.

In the VTR described above, by using one switch and a small-scale logic circuit, three positions of the cassette holder can be detected when the cassette holder is driven, including the state of the cassette holder when the power is turned on. Further, using this switch, it is possible to control both the loading and unloading of the cassette.

In the above embodiment, the motor was controlled by a logic circuit, but it is also possible to perform program control using a 1-chip microcomputer. In this case, use it in other parts of the VTR.

Since the CPU for system control can also be used, further weight and size reductions are possible.

〔Effect of the invention〕

As explained above, in the recording or reproducing apparatus of the present invention, a plurality of positions of the cassette holder can be detected with a single switch, so that the apparatus can be made smaller and lighter, and the mechanism can be simplified.

[Brief explanation of drawings]

FIGS. 1(A), (B), and (C) are diagrams for explaining a displacement detection mechanism of a cassette holder of a VTR as an embodiment of the present invention, and FIG. A diagram showing the control circuit of the holder drive motor, Figures 3 (A) and (B) are timing charts for explaining the operation of the second reply section, and Figure 4 shows the cassette holder in the VTR of this embodiment. The figure shown in Figure 5 is the drive of the cassette holder shown in Figure 4! FIG. 3 is a diagram showing the lJ mechanism. In the figure, l is the device main body, 2 is the cassette h, and io is the cassette holder main body, 14a, 14b, 15a. 15b is a drive shaft, 50 is a rotating plate, 62.63
is a cam, and SW is a switch.

Claims (1)

[Claims] A movable cassette that holds the cassette, the device inserting and loading a cassette containing a recording medium into a device main body, and recording or reproducing signals on the recording medium in the loaded cassette. A holder, a drive mechanism that moves the holder 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 a plurality of cams provided on the rotating plate to turn on and off. 1. A recording or reproducing device comprising: a single switch, the switch detecting a plurality of positions of the cassette holder.