JPH02249160A - Cassette tape recorder - Google Patents

Abstract

PURPOSE:To eliminate the slack of a cassette tape by automatically rotating supply reel spindle in a direction opposite to playback prior to reproduction start with the cassette tape loaded, and stopping this operation by counting the number of pulses of a rotation detecting sensor and judging the forward rotation of the take-up reel. CONSTITUTION:The loading state of the cassette tape is detected by a detecting switch 5, and the tape is wound in the direction opposite to playback by rotating the supply reel spindle with a control means 7. During this process, the driving force of a motor 8 is prevented from being applied to the take-up reel spindle 2, the slack of the tape is eliminated and the rotation of the take-up reel spindle 2 is detected by the rotation detecting sensor 6, then the rotation of the supply reel spindle 4 is stopped. Then, the standby state of a reproduction commanding switch is set. In such a manner, it is possible to automatically eliminate the slack of the tape and to guarantee a stable reproducing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a portable cassette tape recorder capable of forward and reverse playback.

Conventional technology In recent years, cassette tape recorders have become smaller and lighter.
In addition, an electronically controlled cassette mechanism, generally called a feather mechanism or logic mechanism, is often employed.

An example of a conventional cassette tape recorder will be described below with reference to the drawings.

FIG. 5 is a circuit diagram showing a conventional rotation detection method for a cassette tape recorder. In FIG. 5, 1 is a cassette mechanism, 2 is a forward rotation side take-up reel shaft, 3 is a rotation detection reflector connected to the shaft, 4 is a reverse rotation side take-up reel shaft, 5 is a cassette tape attachment detection switch, 6 is a reflective optical sensor for detecting rotation, 7 is a control means, 8 is a motor, 9 is a power source battery, and 10 is a reproduction command switch.

3ノ\-7 In the configuration shown in Figure 6, when a cassette tape is inserted,
When the cassette tape installation detection switch 6 closes, the control means 7
is in a waiting state for input. When you press playback switch 1o,
The control means 7 outputs the signal to the motor 8, and the motor starts rotating in the forward rotation direction, entering a normal rotation regeneration state. Until the tape is wound up, the V-shaft 2 and the reflection plate 3 continue to rotate, and the optical sensor 6 generates ON-OFF pulses through the reflection-absorbing portion provided on the reflection plate 3. It is input to the control means 7. When the tape is wound, the normal rotation side reel shaft 2 and the reflection plate 3 stop rotating, and the optical sensor 6 stops outputting pulses. Upon determining that the pulses have stopped for a certain period of time, the control means 7 stops the motor 8 or switches the state of the mechanism 1 to a regeneration state in the reverse direction.

Problems to be Solved by the Invention However, in the above configuration, when a cassette tape is inserted, if the tape is loose on the forward rotation side reel, this is not detected and the tape is moved to the forward rotation side IJ) V axis 2.
The tape rotates and advances the tape while it is being played, so there is a high risk of the tape becoming entangled. In order to avoid this, it was necessary to complicate the structure of the cassette mechanism.

Further, it is necessary to provide the rotation detection reflection plate 3 and the optical sensor 6 on the reel shaft side on the reverse rotation side, and there are problems such as imposing restrictions on design conditions inside the device such as component arrangement.

In view of the above problems, the present invention provides an excellent cassette tape recorder that uses a rotation detection sensor to automatically remove tape winding slack when a cassette tape is loaded, thereby ensuring stable playback operation.

Means for Solving the Problems In order to solve the above problems, the cassette tape recorder of the present invention includes a detection switch for detecting loading of a cassette tape or opening/closing of a cassette lid, and a detection switch for winding the tape when playing it for the first time after loading the cassette tape. A rotation detection sensor that detects the rotation of the forward reel shaft, and a control that controls the motor and cassette mechanism to rewind the cassette tape by a predetermined amount using the signals from the detection switch and rotation detection sensor as inputs. It is equipped with the means.

According to the above-described structure, the present invention detects the mounting state of the cassette tape by the detection switch, and winds the tape in the opposite direction to the direction in which it is to be played by rotating the reel shaft on the reverse side using the weather measuring means. take. At this time, the driving force of the motor is not transmitted to the reel shaft on the forward rotation side, and the rotation detection sensor detects that the slack in the tape winding has been removed and the reel shaft on the forward rotation side has begun to rotate. The rotation of the saw 1V axis on the reverse side is stopped and the regeneration command switch enters the standby state.

Embodiment Hereinafter, a tape recorder according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram of a rotation detecting section of a tape recorder according to a first embodiment of the present invention, and the configuration is the same as that of the conventional example shown in FIG. 6 except for the counter connected to the sensor input circuit of the control means 7. . FIG. 2 shows an operation flowchart of the circuit of FIG. 1. In Fig. 2, the direction in which playback is started after the tape is loaded is specified in advance as the forward rotation direction, and when loading the cassette tape, the control means first determines whether the tape detection switch 5 in step 1 is manually operated and if the tape is inserted. Then, in step 2, the reel shaft 4 on the reverse side is rotated, and winding is started in the direction opposite to the prespecified playback start direction, that is, the normal rotation direction. Then, in steps 3 and 4, confirm that the rotation detection sensor 6 has generated two pulses,
It is determined that the slack in the tape has been taken up, the winding operation is stopped in step 5, and the system waits for a reproduction command. The purpose of counting the number of generated pulses twice with the above content is that when the stop position of the reflector 3 reaches the process of step 4, the sensor 6
When the motor stops at the N-OFF boundary position, there is a risk of pulses being generated due to external vibrations, so to prevent the motor from stopping before the tape winding has been completely taken up, it is possible to prevent the motor from stopping. This is to ensure that the picking operation is executed.

Figure 3 shows the processing from OFF to ON in addition to the processing in Figure 2.
This is an operation flowchart showing that consideration has been given to performing the same operation as in Figure 2 when the system is started up.

According to the operation of the embodiment shown in FIG. 3, when the cassette tape is replaced and loaded while the control means 7 is not powered and its operation is stopped, such as when replacing the battery, and then the battery is inserted. In order to ensure that the winding slack is automatically removed, the operations in steps 2 to 5 are always executed at the start of operation after the control means is powered on.

Figure 4 shows that in the process of Figure 1, while waiting for a pulse to be generated from the forward reel shaft 2, the time until a pulse is input at the same time is counted, and even if a certain period of time has elapsed, the desired It is a flowchart showing a process for stopping the winding operation when no pulse input is received, that is, when the normal rotation side reel shaft 2 and the reflection plate 3 do not rotate. According to the operation shown in Fig. 4, it is possible to prevent the tape from being unable to escape from the pulse standby state when loading a tape that has almost no winding slack and has been completely wound in the direction of the reel shaft 4 on the reverse side. It is something to do. According to the process shown in FIG. 4, when the cassette tape 1 is taken out immediately after moving to step 2, it is also possible to prevent the reverse reel from continuing nine times in the pulse standby state.

In the first to third embodiments, the winding operation is stopped when the number of pulses generated on the normal rotation side reel shaft is two, but the generation of two or more pulses may be detected. Further, the winding operation may be performed when the power supply battery is replaced.

Further, in the first to third embodiments, when performing the winding operation, the rotational speed of the reel shaft 40 on the reverse side is not the same as the speed during playback, and the speed of the motor is increased or the motor rotation transmission means is Winding may be performed at high speed by switching the winding speed. After the winding operation described above is completed, the twisted sensor 6 can be used as a cassette tape running detection sensor.
Tape end detection can be performed in the same way as in the conventional example.

Effects of the Invention As described above, the present invention includes a detection switch that detects whether the cassette lid is opened/closed or whether a cassette tape is loaded, and a rotation of the take-up reel shaft on the reverse side in the direction in which the cassette 1-tape is loaded. a rotation detection sensor that detects the cassette tape, and a control means that receives signals from the detection switch and the rotation detection sensor as input to control the motor and cassette mechanism to run and stop the cassette tape, and starts playback operation when the cassette tape is loaded. By automatically rotating the reverse side reel in the opposite direction to the playback start direction, and counting the number of pulses generated by the rotation detection sensor and determining that the forward side reel has rotated, the operation is stopped. , you can remove the slack in the cassette tape.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a cassette tape recorder according to a first embodiment of the present invention, FIG. 2 is an operation flowchart 1 of FIG. 1, and FIG. 3 is a circuit diagram of a cassette tape recorder according to a second embodiment of the present invention. FIG. 4 is an operation flowchart of the third embodiment of the present invention, and FIG. 5 is a circuit diagram showing a conventional cassette tape recorder. 1...Cassette mechanism, 2...Normal rotation (Ill winding 10/reel shaft, 3...Reflector plate for rotation detection, 4...
...Reverse side winding series shaft, 5...Cassette tape installation detection switch, 6...Reflective optical sensor for rotation detection, 7...Control means, 8.・・・・・・
・Motor, 9...Power battery. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] A detection switch that detects whether the cassette lid is opened or closed or whether a cassette tape is loaded; a rotation detection sensor that detects the rotation of a first reel shaft that winds the tape in the direction in which it is first played after the cassette tape is loaded; and the detection switch and rotation detection The control means receives a signal from the sensor as an input and controls the motor and cassette mechanism to run and stop the cassette tape, and the control means operates the motor and the cassette mechanism when the detection switch inputs. Winding of the cassette tape is started by rotating the reel shaft on the opposite side to the first reel shaft in a direction opposite to the forward playback direction, and the rotation detection sensor detects that the first reel shaft has started to rotate. A cassette tape recorder characterized in that the motor and the cassette mechanism are stopped at the point when the cassette tape is wound, and the slack in the cassette tape is removed before the playback operation starts.