JPS6085455A - tape recorder - Google Patents

Abstract

PURPOSE:To enable to return automatically to a stop position when power source is turned on even if the position is at any operation mode when the power source is released by using a device that detects the stop position. CONSTITUTION:A switch 32 for detecting stop position that becomes on when stop state and becomes off in the state of sound recording and reproduction and in the state of cue/review is attached to a tape recorder provided with a movable member, a driving device and a holding device. The switch 32 is made off when in cue/review position at the time of releasing of power source. When the power source switch 34 is made on, a pulse generating circuit 37 generates pulse for driving a solenoid, and an AND circuit 38 outputs the pulse to drive the solenoid for a fixed time, and returns to the stop position by releasing the solenoid. When it is at the stop position, the switch 34 is made on, and does not become output of the AND circuit 38 and remains at the stop position. Thus, initial state can be set always at the stop position after the power source is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder in which operation modes such as a stop state, a recording/playback state, and a cue/review state are switched by the same driving means, and in particular, the present invention relates to a tape recorder in which operation modes such as a stop state, a recording/playback state, and a cue/review state are switched by the same driving means. Even if there is, the purpose is to automatically return to the stopped position when the power is turned on next time.

The applicant has already applied for utility model registration No. 1659 of 1986.
In No. 64 (hereinafter referred to as the prior application), a tape recorder was proposed in which a stop state, a recording/playback state, and a cue/review state are switched by the same driving means. However, in tape recorders that switch using a single drive means, when the power is turned off, the tape recorder either returns to the stop position or is held in the cue/review position; If it is, it will be difficult to insert and remove the tape, so either install a special storage mechanism, or turn on the power and return it to the stop position by operating a stop switch, etc., and then remove the tape. There is a drawback that insertion and removal must be performed.

According to the present invention, the tape recorder uses means for detecting the stop position, and automatically returns to the stop position when the power is turned on, even if it is at the cue/review position when the power is turned off, and does not require any special operation. can be configured.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention in a stopped state, FIGS. 2 and 3 are a plan view and side view showing a recording/playback state, and FIG. 4 is a plan view showing a cue/review state. be.

In the figure, 1 is a board, 2 is a capstan, 3 is a letter flywheel attached to the capstan 2, 4 is a bearing for the capstan 2, 6 is a bearing for the capstan 2, 6 is a pinch roller, and 7 is a movable member. Working head chassis,
8 is a pinch roller shaft attached to the head chassis 7;
9 is a magnetic head attached to the head chassis 7; 14;
1 is a tape cassette having tape holders 10 to 13;
5.16 is a pair of reels, 17 is a motor, 18 is a pulley, 19 is a belt suspended between the pulley 18 and the flywheel 3, and 21.

23 is a pin fixed to the board 1, 26 is a cam plate rotatably attached around the pin 23, and 20 is a pin 2 shown in "2".
1 and the cam plate 25, and always urges the cam plate 26 clockwise; 22, a pin that restricts rotation of the cam plate 26; 24, a pin attached to the head chassis 7; 26 is a spring suspended between the pin 27 of the board 1'' and the head chassis 7, and always urges the head chassis 7 downward in the figure; 28 is a guide hole 71L of the helad chassis 7;
29 is a solenoid that serves as a driving means; 3o is a plunger; 31 is a pin that connects the plunger 30 and the head chassis 7; 32 is a board that is in contact only when the hendger shift is in the stop position. This is a switch for detecting the stop position attached to 1.

This embodiment is particularly different from the previous application in that the switch 32 for detecting the stop position is installed as described above.
In the stopped state shown in FIG. 1, the switch 32 is turned on by being pressed by the hendger shift, and in the recording/playback state and cue/review state shown in FIGS. 2 to 4, it is separated from or slightly touching the herad chassis 7. The switch 326 also turns off.

FIG. 6 shows the driving section in this embodiment. In FIG. 5, 32 is a switch for detecting the aforementioned stop position, 33 is a power source such as a battery, and 34 is a power switch. Reference numeral 36 denotes a drive circuit which receives the rise of the power supply and the stop position switch 32 as inputs, and includes a pulse generation circuit 37 and an AND circuit 38 that detect the rise of the power supply and generate a pulse with a pulse width sufficient to drive a solenoid, which will be described later. The output of the AND circuit 3 is connected to a solenoid driving transistor 41 via a resistor 39. Note that 29 is a driving solenoid.

Figure 6 is a waveform diagram of each part when the power is turned on at the cue/review position, and Figure 7 is at the stop position. e) is the input of the pulse generation circuit, (b) is its output, and (0) is the waveform diagram of each part when the power is turned on. This is a waveform showing the output of the AND circuit 38.

In FIG. 6, if the switch 32 is in the cue/review position when the power is released, the switch 32 is off, and when the power switch 24 is turned on and the power is turned on, the pulse generation circuit 37 is turned on as shown in FIG. 6(b). A pulse for driving a solenoid is generated as shown in FIG. 3, and is supplied to one input of the AND circuit 38. On the other hand, AND circuit 3
The other input of 8 is connected to the switch 32, and since the switch 32 is off and the level is high, the drive pulse is passed through the resistor 39 as the output of the AND circuit 38 as shown in FIG. 6(C). Turn on the driving transistor 40,
By driving the solenoid 29 for a certain period of time and then releasing it, it is possible to return it to the stop position.

Furthermore, when the switch 32 is in the stop position, as shown in FIG. 7, the switch 32 is turned on and one input of the AND circuit 38 is at a low level.
7, even if a drive pulse is generated, it is not output from the AND circuit 38 as shown in FIG. It will remain as .

As described above, if the cue review position is held when the power is turned on, the drive means is driven to return it to the stop position, and if the 7 vanes are returned to the stop position, the drive means is not driven. Since it remains in the stopped position,
After turning on the power, the initial state can always be set to the stop position. In the above embodiments, the case where a battery or the like is used is described, but a power source using a rectified commercial power source can be configured in exactly the same way. Furthermore, in recent years, a method of controlling the operation of a tape recorder using a microcomputer or the like has become common, but even when a microcomputer is used, it can be configured in exactly the same way.

FIG. 8 shows an example using a microcomputer,
FIG. 9 shows the operation flowchart.

In FIG. 8, 41 is a power supply, 42 is a power switch, 3
2 is a stop position detection switch. Reference numeral 43 denotes a drive circuit, which is composed of a microcomputer 44, detects the rise of the power supply at its input terminal 44-2, and
is connected to the switch 32 , and the output terminal 44 - 3 is supplied to the solenoid driving transistor 46 via the resistor 46 to drive the solenoid 29 . With this configuration, it is possible to cause the microcomputer 44 to determine the status of the power supply and the switch 32, and perform the same operations as described above.

As described above, according to the present invention, by a single driving means,
It is possible to configure a tape recorder that switches a stop position, a recording/playback position, and a cue/review position, and automatically returns to the stop position when the power is turned on next time, even if it stops at any of the above positions when the power is turned off.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention in a stopped state, FIGS. 2 and 3 are a plan view and side view showing a recording/playback state, and FIG. 4 is a plan view showing a cue or review state. ,
FIG. 6 is a circuit configuration diagram of the drive section, FIGS. 6 and 7 are waveform diagrams of main parts, FIG. 8 is a configuration diagram showing another embodiment of the drive section, and FIG. 9
The figure is an explanatory diagram of the operation using a flowchart. 7...Head chassis, 9...Magnetic head, 29...Solenoid, 3o...River/plunger,
32... Switch, 33... Power supply, 34
...Power switch 9-beam notch, 36...Drive circuit, 40 songs...Solenoid drive transistor, 41...Power supply, 42...
Old power switch, 43...drive circuit, 46...
Transistor for driving solenoid. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 Figure 6 Figure 7 (C)

Claims (1)

[Claims] a movable member to which a magnetic head is attached; a driving means for moving the movable member from a stop position where the magnetic head is retracted from the magnetic tape to a recording/reproducing position where the magnetic head is in deep contact with the magnetic tape; It includes a holding means for holding the head in a cue or review position where the head makes shallow contact with the magnetic tape, and a detection means for detecting that the movable member is at a stop position, and when the power is turned on, the detection means detects that the movable member is When it detects that it is not at the stop position,
A tape recorder characterized in that the drive means is driven to release the holding state of the holding means and return the movable member to a stopped position.