JPS62232743A - Motor control circuit for tape recorder - Google Patents

Abstract

PURPOSE:To prevent a tape running system from stopping on the way of the switching of a running state, by providing an off detecting and holding part and an FF part that detect the off state of a switching element which is interlocked with a rapid traverse/rewinding button, and holds it for a reulated time. CONSTITUTION:At the time of a rapid traverse/rewinding operation, when the second switching element 3 interlocked with the rapid traverse/rewinding button is turned off, the fact is detected by an off detecting and holding part 11, and the output of the holding part 11 becomes high for the regulated time. In such case, a time while the high level of the part 11 is kept, is set as a little longer than the time from when the output of a motor driving part 7 becomes low, and the power source of a motor 8 is turned off, until when the rotation of the motor 8 stops actually. And when a play button is depressed after the rapid traverse/rewinding is removed in a high level time, and before the rotating speed goes to zero, the motor 8 is driven again through an FF13, and the motor 8 stops after the first running system 9 goes to a playing state completely. In this way, the running state of the tape running system 9 is prevented from stopping on the way of the switching, and inconvenience, such as a state impossible to take out the tape, can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to motor on/off control of a tape recorder.

BACKGROUND OF THE INVENTION In recent years, tape recorders, for example, have a continuous "playback" function that allows each tape drive system to run continuously by turning on and off the tape drive motor of each tape drive system in a tape recorder that has two tape drive systems. etc. have been realized.

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

FIG. 3 shows an example of a conventional tape recorder motor control circuit. In FIG. 3, 1 is a power supply terminal, and 2 is a first switch element, which operates in conjunction with play, fast forward, rewind, etc. operation buttons of the first tape running system 9, which will be described later. It is a switch element that closes when a button is pressed. Reference numeral 3 designates a second switch element, which operates in conjunction with the fast forward and rewind buttons of the first tape running system 9 and closes when the button is pressed. Reference numeral 4 denotes a motor control section, which is composed of a fourth switch element 41, a reversing section 42, and a 29th tape running system 43, which will be described later. 43 is a second tape running system, and 41 is a fourth switch element, which operates in conjunction with the play, fast forward, rewind, etc. operation buttons of the second tape running system 43, and when any button is pressed. This is a switch element that closes when pressed. Reference numeral 42 denotes an inverting section, into which the voltage from the power supply terminal 1 is inputted via the fourth switch element 41. Reference numeral 5 denotes a first AND section, into which the output of the motor control section 4, that is, the output of the inverting section 41, and the voltage from the power supply terminal 1 via the first switch element 2 are input. 6 is an OR section, and the first ANDNSO
2 power and a voltage from the power supply terminal 1 via the second switch element 3 are input. 7 is a motor drive unit, 01
An output signal from the section 6 drives a motor 8, which will be described later. 9 is a first tape running system, and 8 is a motor, which causes the first tape running system 9 to run the tape.

The operation of the motor control circuit configured as above will be explained below.

When the second traveling system 43 is in a stopped state, the button is not pressed, so the fourth switch element 41 is off, and the input of the reversing section 42 is low, so the output of the motor control section 4 is high. becomes. When the second running system 43 is in the play state, etc., the button is pressed, so the fourth switch element 41 is not on, and the input of the reversing unit 42 is high, so the output of the motor control unit 4 becomes low. When the second traveling system 43 is currently in a stopped state, that is, when the output of the motor control section 4 is high, and if the first traveling system 9 is in a stopped state, the first switch element 2 is turned off. Since one input of the first ND section 6 becomes low, its output also becomes low. At this time, since the second switch element 3 is also off, both inputs of the 01 section 6 are low, and its output is also low.
Motor is stopped. At this time, when the play button of the first running system 9 is pressed, the first switch element 2 is turned on, and the two inputs of the first mu II) section 5 become high.
The output becomes high, P passes through the 01 section 6, the motor 8 is rotated by the motor drive section 7, and the first running system 9 starts running the tape.

Next, when the second tape running system 43 is in a state such as play,
That is, when the output of the motor control section 4 is low, even if the first running system 9 is set to the play state, the first ANDNSO2
Since one input is always low, its output is always low and the simulator 8 is stopped. That is, when the second tape running system 43 is in the play state, even if the play button of the first tape running system 9 is pressed, the first tape running system 9 is stopped. At this time, when the second tape running system 43 automatically stops at the end of the tape, the first tape running system 9 starts running from there and performs a continuous reproduction operation. On the other hand, when the second tape running system 43 is in the play state, the first tape running system 9 cannot be in the play state, but the fast forward/rewind button is pressed due to the request to fast forward or rewind the tape. When pressed, that is, when the second switch element 3 is on, one input of the 01 section 6 is high, and the motor 8 is driven so that its output is high.
It is configured to allow fast forwarding and rewinding.

Problems to be Solved by the Invention However, when the above configuration is used in a running system configured to change the running state of the tape running system by the driving force of the tape drive motor 8, the second tape running When the system 43 is in the play state, when the first tape running system 9 is in the fast forward/rewind state and the play button is pressed, the fast forward/rewind is canceled and the second switch element 3 is turned off. Although the motor 8 stops, due to the inertia of the motor 8, the motor 8 continues to rotate for a while and attempts to switch the first tape running system 9 to the play state. At this time, the first
If the motor 8 stops before the running system 9 enters the play state, the switching of the running state of the first tape running system 9 will stop in the middle of switching, so the operation using the operation button of the first tape running system 9 will not be possible. This has caused a problem in that it becomes impossible to take out the tape, etc.

In view of the above-mentioned problems, the present invention has been devised so that when the second tape running system 43 is in the play state, even when the play button is pressed from the fast forward/rewind state of the first tape running system 9, the second tape running system 4
No. 3 provides a motor control circuit that does not stop during a change in running state.

Means for Solving the Problems In order to solve the above problems, the present invention detects that the second switch element linked to the fast forward/rewind button of the first running system is turned off, and then an off detection holding section that generates an output pulse; and a first switch element interlocked with a first tape running system operation button being turned on while the off detection holding section is outputting an output pulse; The output for driving the motor of the tape running system is set, and the motor is driven by a flip-flop unit that is reset by a third switch element that is turned on when the first tape running system is completely in the play state. It is configured.

Effect of the present invention With the above-described configuration, when the second tape running system is in the play state, the first tape running system presses the play button from the fast forward/rewind state, and the second tape running system interlocks with the fast forward/rewind button. If the first switch element linked to the operation button is turned on before the switch element is turned off and the motor is stopped, the first switch element is turned on while the off detection holding section is outputting, so the flip-flop section is selected, the motor rotates, the first tape running system enters the play state, and when the tape drive system is completely in the play state, the third switch element is turned on, the flip-flop section is reset, and the motor stops. Therefore, it is possible to prevent the inconvenience that the first tape running system stops in the middle of switching the running state.

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

FIG. 1 shows the main part of a motor control circuit for a tape recorder in an embodiment of the present invention. In Figure 1,
1 is a power supply terminal, 2 is a first switch element, 3 is a second switch element, 4 is a motor control section, 5 is a first person lfD section, 6 is an OR section, 7 is a motor drive section, 8 is a motor , 9 is a first tape running system, which is constructed in the same manner as the conventional example shown in FIG. 1o is a third switch element, which opens and closes in conjunction with the movement of the magnetic head installed in the first tape running system 9, when the first tape running system 9 is completely in the play state. Turn on. Reference numeral 11 denotes an off detection holding section, which detects on-off of the second switch element 3.
It is configured to detect that it has been switched off and then output a high level for a certain period of time. 12 is the second
The output of the off detection holding section 11 and one end of the first switching element 2 that is not connected to the power supply terminal 1 are inputted. Reference numeral 13 denotes a flip-flop unit, which is configured such that a set input sets the output to high, and a reset input resets the output to low; the set input is the output of the second AND unit 12;
The reset inputs are respectively connected to the power supply terminals 1 via the third switch element 1o, and the output terminals are input to the OR section 6.

The operation of the tape recorder motor control circuit configured as described above will be explained below. When the first tape running system is stopped and the output of the motor control unit 4 is high, the motor 8 operates in accordance with the operation of the operation button of the first tape running system 9, similar to the conventional example shown in FIG. . When the second tape running system is in the play state and the output of the motor control unit 4 is low, it operates in the same way as the conventional example shown in FIG. Even if the element 2 opens and closes, the output of the first ND unit 5 is always low, so the motor does not rotate.On the other hand, when the fast forward/rewind button is pressed, the second
Since the switch element 3 is turned on, the motor rotates and performs fast forward and rewind operations. At this time, when the fast forward/rewind button is released and the second switch element 3 is turned off, the motor 8
The output of the off detection holding unit 11 becomes high for a certain period of time after the second switch element 3 is turned off and the second switch element 3 is turned off.

When the play button of the first tape running system 9 is pressed while the output of the off detection holding section 11 is high, the first switch element 2 is turned on, and both inputs of the second AND section 12 are high. Therefore, the output becomes high and flip-flop section 1
3 is set, and its output is input to the motor drive section 7 through the 08 section 6, the motor 8 rotates, and the first tape running system 9 enters the play state. When the first tape running system 9 enters the play state, the third switch element 1o, which opens and closes in conjunction with the movement of the magnetic head, turns on and resets the flip-flop section 13, so the output of the flip-flop section 13 becomes low and the motor stops. At this time, the time during which the output pulse of the off detection holding section 11 is high is the time during which the output of the motor drive section 7 is low, and the time from when the power to the motor 8 is turned off until the motor 8 actually stops rotating. Set it a little longer. Therefore, even if the play button is pressed and the first switch element 2 is turned on after the fast forward/rewind button is released and the motor 8 has completely stopped, the output of the off detection holding unit 11 remains low. Therefore, the flip-flop 13 is not set and the motor does not rotate. FIG. 2 shows the temporal changes in the above operation. In FIG. 2, (IL) is the output signal of the first switch element 2, (b
) is the output signal of the second switch element 3, (C) is the output signal of the motor control unit 4, (d) is the first ANDNSO2 force signal, (6) is the output signal of the off detection holding unit 11, (f )
is the output signal of the flip-flop section 13, (g) is the output signal of the third switch element 1o, (h) is the output signal of the 08 section 6, and (h) is the output signal of the -O1 section 6 in the conventional example. ,
(i) represents the number of rotations of the motor 8.

As shown in this figure, if the play button is pressed before the rotation speed (i) of the motor 8 reaches 0 after fast forwarding/rewinding is canceled, the motor 8 is driven again and the first run starts. Since the motor 8 stops after the system 9 is completely in the play state, the first
The running state of the tape running system 9 does not stop during switching. In addition, if the play button is pressed after the rotation speed (i) of the motor 8 reaches 0 after fast forwarding/rewinding, which is the normal usage state, is canceled, the motor 8 will not rotate.
In other words, the first tape running system 9 does not enter the play state and stop, but instead stops with the capstan of the first tape running system 9 not in contact with the pinch roller. Perform operations that pose little risk of deformation.

Effects of the Invention As described above, the present invention includes an off detection/holding section that detects that the second switch element linked to the fast forward/rewind button is turned off and holds it for a certain period of time; When the first switch element that operates in conjunction with the operation button is turned on within a certain period of time held, the motor starts rotating, and the third switch element that operates in conjunction with the movement of the magnetic head is turned on. By providing a flip-flop section that stops the rotation of the motor when the motor rotates, it is possible to prevent inconveniences such as the tape running system stopping in the middle of changing the running state and making it impossible to take out the tape. extremely useful. Moreover, when the motor control circuit of these tape recorders is implemented by a microcomputer, the structure of the present invention can be constructed very easily.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of a motor control circuit of a tape recorder in an embodiment of the present invention, FIG. 2 is a waveform diagram showing the time course of operation in the embodiment of FIG. 1, and FIG.
The figure is a block diagram of a conventional tape recorder motor control circuit. 2...First switch element, 3...Second switch element, 4...Motor control unit, 5...
...First AND part, 6...OR part, 7
...Motor drive unit, 9...First tape running system, 1o...Third switch element, 11
. . . OFF detection holding section, 12 . . . second ND section, 13 . . . flip-flop section. Name of agent: Patent attorney Toshio Nakao and one other person? −
--First switch element 3-11 Second switch element 5---￥iJ1 AND迶6-6 迶GPq--119 Tape contraction 1 claw 1 Figure IO-11 3rd Switch type child l? ---Z ANDgP Figure 2

Claims (1)

[Claims] a tape running system, a first switch element that opens and closes in conjunction with an operation button of the tape running system, a second switch element that opens and closes in conjunction with fast forward and rewind buttons of the tape running system, and the tape a third switch element and a motor control section that open and close in conjunction with the movement of a recording/playback head installed in the traveling system; and a third switch element that receives the output of the motor control section and the opening/closing signal of the first switch element as inputs. 1, an off detection holding section that receives the opening/closing signal of the second switch element and outputs an output signal only for a certain period of time after the fast forward and rewind buttons are turned off, and the output of the off detection holding section. a second A that receives the opening/closing signal of the first switch element;
an ND section, a flip-flop section that is set by the output of the second AND section and reset by the opening/closing signal of the third switch element, and an output of the first AND section and the second switch element. A tape recorder comprising: an OR section that receives an open/close signal and an output of the flip-flop section; and a motor drive section that receives the output of the OR section and drives the motor of the traveling system. motor control circuit.