JPS5917009Y2 - Crimping plunger control circuit of tape traveling mechanism - Google Patents

Description

[Detailed description of the invention] The present invention relates to a crimping plunger control circuit for a tape running mechanism in a tape recorder, and in particular, a delay circuit is provided in the front stage of the plunger drive circuit, so that the head is turned on after the motor shifts to constant speed rotation. It relates to a control circuit that allows the tape to be crimped to the tape, allows the motor to rotate at a constant speed when the pause switch is released, and further prevents the tape running detection circuit from operating during the pause operation. It is something.

Generally, in a tape recorder or the like equipped with a crimp plunger, after the play switch is turned on to start the motor, the motor does not shift to constant speed rotation for a short period of time.

If the head is pressed against the tape before shifting to such constant speed rotation, unnatural sounds will be played from the tape, and the motor will be overloaded when starting up, which will shorten its life. .

On the other hand, when a pause is activated during a recording operation, it is desirable that the motor maintain constant speed rotation during the pause.
Furthermore, it is also desirable to set the tape running detection circuit to an inactive state during a pause so that automatic stop or auto-reverse operation of the motor etc. is not performed.

In this case, the present invention is designed so that the head is crimped after the motor shifts to constant speed rotation, and the motor is maintained at constant speed rotation during pause, allowing the tape recorder to always operate properly. The present invention provides a crimp plunger control circuit for a traveling mechanism.

The present invention will be explained below based on the drawings.

First, Fig. 1 shows an example of a tape recorder circuit to which an embodiment of the present invention is applied. In the figure, 1 is a power supply terminal, SL is a stop switch consisting of a normally closed push button switch, etc., and S2 is a play (reproduction) and fast forward switch. (hereinafter referred to as F・F) or rewind (hereinafter referred to as REW) changeover switch, S3 is a play switch, Ul is a holding circuit, S4 is a pause switch, U
2 is a delay circuit, U3 is a crimp plunger drive circuit, PL is a play plunger, U4 is a tape running display circuit, S5 is a recording switch, U5 is a recording control circuit, U6 is FF, R
EW drive plunger circuit, M is a motor, U7 is a motor control circuit, U8 is tape end detection means, and U9 is a tape running detection circuit.

In Fig. 1, for example, ■-■, ◎-〇,...
. . . Wiring is provided and connected in between, but the wiring in the middle is omitted from the illustration.

Next, a crimp plunger control circuit according to an embodiment of the present invention in a tape recorder having the above structure will be described in more detail with reference to FIGS. 2 and 3.

In Figure 2, 1 is the power supply terminal, S3 is the play switch,
Ul is a holding circuit, and this holding circuit U1 is turned on by closing the play switch S3, and this state is maintained as it is.

M is a motor, R2 is a power supply line for the motor, etc., S4 is a pause switch, U2 is a delay circuit, U3 is a crimp plunger drive circuit, PL is a play plunger, and U9 is a tape running detection circuit.

First, as shown in FIG. 3, the holding circuit U1 has resistors R1 and R2 connected between the power supply line L1 connected to the power supply terminal 1 and the ground.
An SCR (silicon controlled rectifier) is connected in the forward direction via the .

Further, the SCR's Day 1 and Electrode 2 are connected to the power supply line L1 via a resistor and a play switch S3 in sequence.

Furthermore, L transistor elements Q, Q2 connected in two stages are arranged in parallel to the resistor R1.

A power supply line L2 for a motor or the like is connected to the collector connection point of the transistor elements FQ, Q2, and a motor M is connected between this power supply line L2 and ground.

Further, a pause changeover switch S4 is provided, with its common contact S4' connected to the power supply line L2 of the motor, etc., and one fixed contact S4'' of this pause changeover switch S4 is connected to the power supply line L3 of the plunger drive circuit. At the same time, the other fixed contact S4'' is connected to the control electrode of the operation setting switch element in the tape running detection circuit U9 (the previous switch element connected to the center line ◎ in U9 in FIG. 1).

When the pause changeover switch S4 is switched to the one fixed contact S4'' side, it is in the pause OFF state, and when it is switched to the other fixed contact S4'' side, it is in the pause operation state. .

Further, the tape running detection circuit U9 is connected to the tape end detection means U3.
When the end of the tape is detected, the recorder performs an auto-reverse operation if it is in play operation, and an automatic stop operation if it is in recording, F-F, or REW operation. This is a circuit that operates.

On the other hand, the power supply line L2 for the motor etc. is also connected to the delay circuit side.

That is, the power supply line L2 for the motor, etc. is connected to the - side end of the capacitor C1 in the delay circuit U2, and the 0 side end of this capacitor C1 is connected to the ground terminal via the resistor R3, and is connected to the transistor element via the Zener diode ZD1. (Switch element for delay operation output) Connected to the control electrode of Q3.

A time constant circuit is formed by the capacitor C1 and the resistor R3.

Dl is a diode element which forms a discharge path of the capacitor C1.

Further, the emitter terminal of the transistor element Q3 is connected to the power supply line L3, and the collector terminal is grounded via a resistor R4 and connected to the plunger drive circuit U3 disposed at the next stage.

The plunger drive circuit U3 includes a time constant circuit 3 consisting of C2 and R5, a transistor element Q4. It is provided with a switching means 4 consisting of Q5, a constant voltage power supply circuit 5 consisting of a transistor element Q6, a Zener diode ZD2, etc.

and the switching means 4 is connected to an intermediate terminal 6 of a solenoid (not shown) in the play plunger PL,
A constant voltage circuit 5 is connected between both ends 7 and 7' of the solenoid.

U2 in the plunger drive circuit U3. U3 is a diode element, and R6, R7, and R8 are resistors.

In the illustrated example, the one-herald transistor element Q3 in the delay circuit U2 is of the P-N-P type, and the switching means 4
The transistor element Q4 constituting the transistor element Q4 is of N-P-N type, and both transistor elements are of different junction types.

The crimp plunger circuit of the tape traveling mechanism according to the embodiment of the present invention is constructed as described above and operates as follows.

When the play switch S2 is now switched to the play side, and the play switch S3 is closed, a signal voltage is applied to the gate electrode 2 of the SCR in the holding circuit U1, and the SCR becomes conductive. turn into a state.

Then, with this conduction, the resistor R1 causes the transistor element Q1. An appropriate bias voltage is applied to Q2, and both transistor elements Q1. Q2 originally turned into conduction.

Therefore, the power supply line L2 for the motor etc. is connected to the power supply, and the motor M starts rotating.

At the same time, power is applied to the delay circuit U2, and the delay circuit U2 operates for a predetermined time (for example, about 0.2 seconds) determined by the time constant circuit of the capacitor C1 and the resistor &.
Thereafter, the transistor element Q3 turns conductive, and power is supplied to the time constant circuit 43 in the plunger drive circuit U3 after a delay of the predetermined time.

As described above, the transistor element Q3 in the delay circuit U2 becomes conductive only after a predetermined time delay after the power is turned on, but thereafter continues to maintain the conductive state.

When the power is connected to the time constant circuit 3 in the plunger drive circuit U3 in this way, the transistor element Q4. Q6 conducts, and during this conductive state the intermediate terminal 6 of the solenoid in the play plunger PL
An attraction current flows between the terminal 7 and one terminal 7, the plunger is attracted, and the head etc. are crimped.

On the other hand, at the same time as this suction operation, a constant voltage for suction is supplied from the constant voltage power supply circuit 5 between both ends 7° and 7' of the solenoid, and even after the suction current is stopped, the plunger continues to be suctioned and the crimping operation is performed. is maintained.

” - As mentioned above, the motor M starts rotating at the same time as the play switch S3 is closed, but the play plunger PL operates after a predetermined time delay due to the delay circuit U2, and the head is crimped, so the tape recorder There are no unnatural sounds that are played until the M shifts to constant speed driving.

On the other hand, when the recording switch S5 is also closed and the tape recorder is in the recording state, the pause switch S4
When the switch is switched to the pause 0N (S4'') side, the power supply to the plunger drive circuit is cut off, and the play plunger PL returns to the OFF state.

Therefore, although the head and the like are no longer crimped, the motor continues to rotate at a constant speed.

Next, when the pause switch S4 is switched to the pause 0FF (S4'') side to cancel the pause state, the delay circuit U2
Since it is already in a steady state, the plunger PL operates immediately without any delay operation, and recording etc. are continued again immediately after the pause is turned off.

In addition, when the pause ON side fixed contact S4'' of the pause switch S4 is connected to the tape running detection circuit U9, when the pause switch S4 is switched to the pause 0N (S4'') side, the power supply line L2 for the motor power source etc. is connected to the tape running detection circuit U9. ■ The tape running detection circuit U9 is connected to the running detection circuit U9.
A signal voltage is supplied, and the operation setting switch element is turned ON by this signal voltage, the input stage is grounded, and the tape running detection circuit U9 is switched to a non-operating state.

Therefore, the tape running detection circuit reliably guarantees constant speed rotation of the motor M without performing an automatic stop operation or an auto-reverse operation, and the tape recorder operates properly.

Although a constant voltage power supply circuit is connected between both ends of the play plunger in the above embodiment, a constant current power supply circuit may be used instead of the constant voltage power supply circuit without any problem.

Furthermore, the junction type of the transistor element is not limited to those shown in FIGS. It operates without any problem, and the structure can be changed as appropriate without losing the purpose and effect of the present invention.

As detailed above, according to the present invention, the power supply line of the motor or the like connected to the power supply in connection with the operation of the play switch is connected to the control electrode of the switch element for delay operation output via the delay circuit, and the delay operation is The output switch element is kept in the OFF state for a predetermined delay time at the beginning of the activation of the delay circuit and then kept in the ON state, while the power line of the motor etc. is connected via the pause changeover switch and the delay operation output switch element. Since it is connected to the plunger drive circuit,
When the play switch is turned on, the motor first starts rotating, and then the plunger drive circuit is activated after a predetermined period of time has elapsed, so you can get the effect that no unnatural sounds are played from the tape, and when you pause the tape. In this case, after the pause is released, the recording state is immediately started without any delay, which is extremely useful in practice.

Furthermore, since the head is not crimped until the motor starts rotating at a constant speed, the motor will not be overloaded at startup and its life will not be shortened.

Furthermore, a changeover switch is used as the pause switch, and the common contact of this pause changeover switch is connected to the power supply line of the motor, etc., and one fixed contact of the pause changeover switch is connected to the plunger drive circuit through a switch element for prolonged operation output. In addition, the other fixed contact was connected to the operation setting switch element in the tape running detection circuit so that the tape running detection circuit would not operate during the pause operation.
During pause, the tape running detection circuit does not perform automatic stop or auto-reverse operation, ensuring constant speed rotation of the motor, and ensuring that the tape recorder always operates properly, which is an extremely excellent practical effect. can get.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an example of a tape recorder to which an embodiment of the present invention is applied, FIG. 2 is a block diagram showing an embodiment of a crimping plunger control circuit of a tape running mechanism according to the present invention, and FIG. is an electric circuit diagram of the same embodiment. 1: power supply terminal, 3: time constant circuit, 4 switching means, C1, C2: capacitor, Dl, D2. D3: Diode element, Ll: Power supply line connected to the power supply terminal, L2:
Power line for motor, etc., power line for L3 nib plunger drive circuit, R1-R8: Resistor, PL nib plunger, Q
l, Q2. Q4 to Q6: Transistor element, Q3: Transistor element (switch element for delayed operation output), S2 nibray and F-F or REW changeover switch, S3 nibbley switch, 'S4: Pause changeover switch, Ul: Holding circuit, U2 : Delay circuit, U3: Crimp plunger drive circuit, U4: Tape running display circuit, U6: FF, RE
W drive plunger circuit, U7: Motor control circuit, U8:
Tape end detection means, U9: Tape running detection circuit, M:
motor.

Claims (1)

[Scope of utility model registration request] A power supply line for a motor or the like connected to a power supply in connection with the operation of the play switch is connected to a control electrode of a switch element for delay operation output via a delay circuit, and the switch element for delay operation output is connected to the control electrode of the switch element for delay operation output when the delay circuit is first activated. ON for the specified delay time
F state and thereafter maintained in the ON state, and on the other hand, connect the power line of the motor etc. to the common contact of the pause changeover switch, and connect one fixed contact of the pause changeover switch via the delay operation output switch element. the other fixed contact is connected to the control electrode of the switch element for operation setting in the tape running detection circuit, the pause changeover switch is set to one of the fixed contacts, and the play switch is connected to the drive circuit for the play plunger. When turned ON, the drive circuit for the play plunger is activated after a predetermined time delay set by the delay circuit, and when the pause changeover switch is set to the other fixed contact to enter the pause state, the operation setting switch When the element is reversed and the tape running detection circuit is set to be inactive, and the pause changeover switch is switched to one of the fixed contacts after setting the pause state, the play plunger is immediately turned on by maintaining the ON state of the delay operation output switch element. A crimping plunger control circuit for a tape traveling mechanism, which operates a drive circuit for a tape running mechanism.