JPH0338666B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to stop state, recording/playback state, queue/playback state,
To provide a tape recorder in which operation modes such as a review state are switched by the same driving means, and to automatically return to a stop position when the power is turned on next time, no matter which operation mode it is in when the power is turned off.

The applicant has already applied for utility model registration in 1982.
No. 165964 (refer to Utility Model Publication No. 2-37136, hereinafter referred to as the "prior application"), in the stop state, recording and playback state,
We proposed a tape recorder in which the same drive means can switch between the ``Queue'' and ``Queue'' states. However, in a tape recorder that switches with a single driving means, when the power is turned off, it either returns to the stop position or is held in the queue/review position; If this is the case, it will be difficult to insert and remove the tape, so either install a special mechanism for this purpose, or turn on the power and return it to the stop position by operating a stop switch, etc. before inserting the tape. - There was a drawback that it had to be taken out.

According to the present invention, by using means for detecting the stop position, even if the power is turned off at the queue/review position, when the power is turned on, the stop position is always automatically returned to the stop position.
It is possible to configure a tape recorder that does not require special operations.

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 (a state in which the magnetic head and the magnetic tape and the pinch roller and the capstan are separated), and FIGS. 2 and 3 are plan views showing the recording and playback state. and side view,
FIG. 4 is a plan view showing a queue-review state (a state in which the magnetic head and magnetic tape are in contact and the pinch roller and capstan are separated). In the figure, 1 is a substrate, 2 is a capstan, 3 is a flywheel attached to the capstan 2, 4 is a bearing of the capstan 2, 5 is a bearing of the capstan 2, 6 is a pinch roller, 7 is a head chassis that operates as a movable member, 8 is a pinch roller shaft attached to the head chassis 7; 9 is a magnetic head attached to the head chassis 7; 14 is a tape cassette having tape holders 10 to 13;
6 is a pair of reels, 17 is a motor, 18 is a boley, 19 is a belt suspended between the boley 18 and the flywheel 3, 21 and 23 are pins fixed to the board 1, and 25 rotates around the pin 23. A movably mounted cam plate 20 is suspended between the pin 21 and the cam plate 25, and a spring 22 always biases the cam plate 25 clockwise to restrict rotation of the cam plate 25. A pin 24 is a pin attached to the head chassis 7, 26 is a spring suspended between the pin 27 on the board 1 and the head chassis 7 and always biases the head chassis 7 downward in the figure, and 28 is a guide hole 7a of the head chassis 7. 29 is a solenoid that serves as a driving means; 30 is a guide pin loosely fitted therein;
3 is a plunger, 31 is a pin that connects the plunger 30 and the head chassis 7, and 32 is a pin that connects the base plate 1 so that it comes into contact only when the head chassis 7 is at the stop position.
This is a stop position detection switch installed on the

The differences in this example from the previous application are as follows:
As mentioned above, the switch 32 for detecting the stop position is installed, and in the stopped state shown in FIG. 1, the switch 32 is turned on by being pressed by the head chassis 7, and the switch 32 is turned on in the stopped state shown in FIGS. 2 to 4.・In the review state, the switch 32 is not activated even if it is separated from the head chassis 7 or even if it is slightly touched.
is turned off.

FIG. 5 shows the drive section in this embodiment. Fifth
In the figure, 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 is a drive circuit that receives the power rise and stop position switch 32 as inputs, and a pulse generation circuit 3 that detects the power rise and generates a pulse with a pulse width sufficient to drive a solenoid, which will be described later.
7 and an AND circuit 38.
The output of is connected to a solenoid driving transistor 41 via a resistor 39. Note that 29 is a driving solenoid.

Figure 6 shows the 7th position at the queue/review position.
The figure shows the waveform diagram of each part when the power is turned on at the stop position.
A is a waveform showing the input of the pulse generating circuit, b is the output thereof, and c is the waveform showing the output of the AND circuit 38.

In FIG. 5, if the switch 32 is in the queue/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 generating circuit 37 is activated as shown in FIG. 6b. A pulse for driving the solenoid is generated in this manner and is supplied to one input of the AND circuit 38. on the other hand,
The other input of the AND circuit 38 is connected to the switch 32, and since the switch 32 is off and at a high level, the drive pulse is passed through the resistor 39 as the output of the AND circuit 38, as shown in FIG. 6c. Turn on the driving transistor 40 and turn on the solenoid 2.
By driving 9 for a certain period of time and then releasing it, it is possible to return it to the stopped position.

When the switch 32 is at the stop position, the switch 32 is turned on and the AND circuit 38 is turned on as shown in FIG.
Since one of the inputs is at a low level, even if a driving pulse is generated by the pulse generating circuit 37 when the power is turned on, the driving pulse is not output from the AND circuit 38 as shown in FIG. 40, the solenoid 29 is not driven and remains in the stopped position.

As described above, when the power is turned on and the unit is held in the queue/review position, the drive means is driven to return to the stop position, and when the power has been returned to the stop position, the drive means is not driven and is returned to the stop position. Therefore, the initial state can always be set to the stop position after the power is turned on. 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, it has become common to use a microcomputer or the like to control the operation of a tape recorder, but even when a microcomputer is used, the configuration can be made in exactly the same way.

FIG. 8 shows an embodiment using a microcomputer, and FIG. 9 shows its operation flowchart. In FIG. 8, 41 is a power source, 42 is a power switch, and 32 is a stop position detection switch.
43 is a drive circuit, which is composed of a microcomputer 44, whose input terminal 44-2 detects the rise of the power supply, whose input terminal 44-1 is connected to the switch 32, and whose output terminal 44-3 is a resistor. The signal is supplied to the solenoid driving transistor 46 via the transistor 45 to drive the solenoid 29. In this configuration, the microcomputer 44 has a power supply and a switch 3.
It is possible to determine the state of 2 and perform the same operation as above.

As described above, the tape recorder of the present invention includes a solenoid that moves the movable member to which the magnetic head is attached in the direction in which the magnetic head comes into contact with the recording surface of the magnetic tape, and a solenoid that continues to be energized to cause the movable member to perform recording and playback. a member for positioning the state;
Each time the solenoid is energized and energized, the movable member is moved to a stopped state where the magnetic head and magnetic tape and the pinch roller and capstan are separated, and a state where the magnetic head and magnetic tape are in contact and the pinch roller and capstan are separated. a holding member that alternately holds the movable member in two states; a detection means that detects whether the movable member is in a stopped state; and a solenoid By providing a means for energizing the solenoid for a predetermined period of time, one solenoid can switch between three states, and when the power is turned on, this solenoid is energized for a predetermined period of time, so the state can be changed without using a new drive means. By using a solenoid that switches the head, etc., it is possible to return the head, etc. to the stopped position when the power is turned on.

[Brief explanation of 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 queue or review state. , FIG. 5 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 is a flowchart of its operation. It is an explanatory diagram. 7... Head chassis, 9... Magnetic head, 2
9...Solenoid, 30...Plunger, 32...
...Switch, 33...Power supply, 34...Power switch, 36...Drive circuit, 40...Solenoid drive transistor, 41...Power supply, 42...Power switch, 43...Drive circuit, 46...Solenoid drive transistor.

Claims (1)

[Scope of Claims] 1. A substrate having holding means for holding a magnetic tape and a capstan, and a substrate movable relative to the substrate and facing the recording surface of the magnetic tape held by the holding means. a movable member to which a pinch roller is attached facing the provided magnetic head and the capstan; a spring that biases the movable member in a direction in which the magnetic head moves away from the recording surface of the magnetic tape; a solenoid that moves the movable member in a direction in which the magnetic head contacts the recording surface of the magnetic tape against an urging force; and a member that positions the movable member in a recording/playback state by continuing to energize the solenoid. Each time the solenoid is energized and energized, the movable member is moved between a stopped state in which the magnetic head and the magnetic tape and a pinch roller and the capstan are separated, and a stopped state in which the magnetic head and the magnetic tape are in contact and the pinch roller and the capstan are separated. a holding member that alternately holds the movable member in two states, a state in which the movable member is in a stopped state and a state in which the movable member is separated; and a detection means for detecting whether the movable member is in a stopped state or not; A tape recorder comprising means for energizing the solenoid for a predetermined period of time when detecting that the solenoid is not in a stopped state.