JPS6331220Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a mechanism to prevent erroneous operation, which prevents the power switch from being pressed when a tape recorder, video tape recorder, etc. is set to timer recording. The purpose of this invention is to prevent a recording medium such as a magnetic tape from being accidentally erased due to an unexpected recording state when timer recording is mistakenly set in, for example, a full logic control tape recorder.

For example, in the case of cassette tape recorders (hereinafter referred to as cassette decks), devices with so-called full logic control, in which all operation modes are selected by electrical operation buttons, are becoming increasingly popular.

Furthermore, in cassette decks, recording or playback is automatically started using a timer device, and in order to perform such timer recording or timer playback, timer recording, timer playback, or Alternatively, a timer operation changeover switch is used to turn off any of them.

In addition, the mechanism control circuit of the full logic control type cassette deck enters recording mode when both the record button and playback button are pressed, and
The circuit is configured to enable so-called follow-up recording, in which pressing the record button after pressing the playback button enters recording mode.The recording hold circuit takes priority over the playback hold circuit, so for example, if the playback button is pressed in the recording mode, Playback does not start even if you press the button.

Therefore, in the case of timer recording, the timer operation selector switch performs the same circuit operation as when both the record button and the playback button are pressed, and in normal use without a timer device, the timer operation selector switch If the cassette deck has been switched to timer recording, the cassette deck starts recording when the power is turned on.

In this case, even if the user presses the play button, for example, the recording operation continues without switching to playback, which may cause the inconvenience of accidentally erasing the recorded magnetic tape. In conventional cassette decks, measures to prevent such malfunctions have been limited to attaching cautionary labels to the equipment to warn the user.

This invention is designed to mechanically prevent such malfunctions, and will be explained below with reference to an embodiment shown in the drawings of a cassette deck.

FIG. 1 shows a plan view of the erroneous operation prevention mechanism before operation. 1 is a power switch, 2 is a switch operation lever, and a switch button 3 is fixed to one end of the switch operation lever 2, which is slidable. The other end is coupled to a switch rod 1a which dynamically takes on and off modes.

Reference numeral 4 denotes an operation panel, from which the switch button 3 protrudes, and the power switch 1 is turned on and off via the switch operation rod 2.
5 is a slide switch for switching timer operation,
The switch bar 5a is provided with a switch bar 5a which can be slid articulately, a switch knob 6 is mounted on the switch bar 5a, and the slide switch 5 is screwed onto a switch holder 7. Reference numeral 8 denotes a regulating plate, which is held slidably in the direction of arrow A-B by the left and right bent pieces 7a and 7b of the switch holder 7, and is urged in the direction of arrow A by a spring 9. .

The shape of the regulating plate 8 is as shown in FIG.
A through-hole 8a is provided through which the switch knob 6 is inserted, and the width of the through-hole 8a is larger than the width of the hem 6a of the switch knob 6.

The slide switch 5 can be dynamically switched to three positions: timer recording, off, and timer playback by operating the switch knob 6.

FIG. 3 shows a state in which timer recording is set after the power switch of the erroneous operation prevention mechanism is turned on.

In this case, the switch button 3 of the power switch 1 is held in the ON position by the joint mechanism of the switch rod 1a, and the switch knob 6
When the slide switch 5 is switched to timer recording by the movement of the arrow, the restricting plate 8 is moved in the direction of the arrow by the spring 9, and its tip 8b
is in contact with the right side surface of the switch button 3.

Such an operation is performed during normal timer recording, and it is necessary to turn on the power switch 1 in advance in order to turn on the power to the cassette deck at a predetermined time using the timer device.

Next, FIG. 4 shows a state in which timer recording is set when the power switch is turned off, that is, a state in which an erroneous operation has been performed.

In this case, the switch button 3 of the power switch 1 is retracted to the off position, and when the slide switch 5 is switched to timer recording, the regulation plate 8 is moved by the spring 9 as the switch knob 6 is moved. However, the regulation plate 8 is not prevented from following its movement by the switch button 3, and moves in the direction of the arrow A over the entire stroke, and the left end portion 8b protrudes from the back side of the switch button 3.
Switch button 3 cannot be pressed.

As described above, timer recording can be set after the power switch is turned on, but after setting the timer recording, the power switch 1 cannot be turned on, and the regulation plate 8 is used to control this. However, the regulation plate 8 has a through hole 8a so that the switch knob 6 of the slide switch 5 can move to a predetermined position (timer recording position) regardless of whether it is engaged with the switch button 3 of the power switch 1.
and the hem 6a of the switch knob 6,
Moreover, it is moved via a spring 9.

It should be noted that although the erroneous operation prevention effect of this invention is performed by the related operation of the power switch and the switch for switching to timer recording, the structure is not limited to the above embodiment.

In other words, the switch for switching the timer operation may be a switch that only switches between operation and non-operation of timer recording, and in addition to the slide switch, for example, a rotary switch or a pushbutton switch can also be used. Any configuration is sufficient as long as the movable member that is displaced via the spring means and the operating member that turns on and off the power switch are engaged when switching to recording.

This invention uses the above-mentioned erroneous operation prevention mechanism in a recording/playback device such as a full logic control tape recorder, so that even if timer recording is accidentally set, the power switch cannot be turned on. It is possible to prevent an accident in which a recording operation is performed against one's will and the recorded tape is erased, and also because only one regulating plate and one spring are required as a mechanism for preventing erroneous operation. It has the advantage of requiring very little cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the erroneous operation prevention mechanism of this invention before operation, Fig. 2 is a parts diagram of the regulation plate 8, and Fig. 3 is after the power of the erroneous operation prevention mechanism of this invention is turned on. FIG. 4 is a plan view showing the state in which the timer recording is set. FIG. 4 is a plan view showing the state in which the timer recording is set, that is, the effect of preventing operation of the power switch. 1...Power switch, 2...Switch operation lever,
3...Switch button, 4...Operation panel, 5...
...Slide switch for switching timer operation, 6...
...Switch knob, 7...Switch holder, 8...
Regulation plate, 9...spring.

Claims (1)

[Scope of utility model registration request] In a recording/playback device in which each operation mode is selected by an electrical operation button, and which can automatically start recording operation when the power is turned on by a timer device, a power switch and a power switch are used. , an operating member for turning on and off a power switch, a timer recording switch for switching at least between operation and non-operation of timer recording, and a movable member that is displaced via spring means in response to switching of the timer recording switch. When the timer recording switch is switched to the timer recording side while the power switch is off, the movable member prohibits operation of the operating member to prevent the power switch from being turned on. Mechanism to prevent erroneous operation between the timer recording switch and power switch.