JPS5849928B2 - Cassette type tape transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape transport device such as a cassette-type tape deck or tape recorder for running a tape stored in a tape cassette, and more specifically, to The present invention relates to a cassette-type tape transfer device that is provided with a mechanism that automatically removes tape slack in advance.

For example, immediately after a magnetic tape cassette is loaded into a tape recorder or tape deck, the magnetic tape is usually slack within the cassette case.

Such slack in the tape is absorbed when the tape starts running for recording or playback, but while there is slack, the tape run and tape tension become unstable at the beginning of recording or playback, making it difficult to operate properly. Recording or playback is not possible.

In order to solve this problem, a method is already known in which the tape is driven once in a fast-forward mode or the like for a certain period of time after the cassette is loaded, and the slack in the tape is automatically removed.

However, when a tape slack removal driving period is provided, the operation I! to obtain the recording or playback mode is not performed until this driving period ends. 1s becomes impossible, and the start of recording or reproduction is delayed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape transport device that can arbitrarily perform play mode setting operations and can also remove tape slack that occurs between the first tape run and the next tape run. Our goal is to provide the following.

To achieve the above object, the present invention includes a tape running mechanism for running the tape of a cassette, a power switch for turning on/off a power supply circuit for driving the tape running mechanism, and a power switch for turning on/off a power supply circuit for driving the tape running mechanism, and a power switch for turning on/off a power supply circuit for driving the tape running mechanism of the cassette. a loading detection switch that detects that the tape is loaded in a position; a play operation section that is operated to put the tape running mechanism into a play mode; and a play operation section that is coupled to the play operation section and stores the play operation of the play operation section. The play operation storage section configured as above, and the tape slack during the period from the time when both the power switch and the loading detection switch are activated to the time when the tape slack removal is substantially completed. A tape slack removal signal generation circuit that generates a removal signal is coupled to the play operation storage unit and the tape slack removal signal generation circuit, respectively, and the tape slack removal signal is not generated from the tape slack removal signal generation circuit. During the period, the tape running mechanism is controlled to operate in a mode corresponding to the stored content in response to the memory output of the play operation storage unit, and the tape slack removal signal generating circuit controls the tape running mechanism to operate the tape running mechanism in a mode corresponding to the stored content. During a period in which the slack removal signal is being generated, in response to the tape slack removal signal, the tape transport mechanism is prevented from operating in a mode corresponding to the content stored in the play operation storage section, and the tape transport mechanism is operated. The present invention relates to a cassette-type tape transport device characterized by comprising a tape transport mechanism control circuit configured to operate in a tape slack removal mode.

According to the present invention, the following effects can be obtained.

(a) Since the play mode or the tape slack removal mode is determined based on the output of the play operation storage unit and the output of the tape slack removal signal generation circuit,
The generation of the tape slack removal signal is not bound to the play operation, and the play operation is not bound to the tape slack removal signal.

Therefore, it is possible to perform a play operation during the period when the tape slack removal signal is being generated.

(Example) Since the tape slack removal signal is generated in response to power on and cassette loading, the tape slack removal signal is generated even if the power is turned on with a cassette already loaded.

Therefore, slack in the tape after loading the cassette, or slack in the tape after playing, fast forwarding, etc., can be removed in synchronization with power-on.

Hereinafter, actual winding examples of the present invention will be described with reference to the drawings.

In FIG. 1, which shows a block diagram of a cassette-type tape deck having a tape slack removal mechanism according to one embodiment of the present invention, a tape running mechanism 1 for running a magnetic tape of a cassette (not shown) is indicated by a dotted line. It is shown in a box for explanatory purposes.

This tape running mechanism 1 includes a pair of reel shafts 2 and 3 that respectively engage a pair of reel hubs in a cassette, a pair of rotating drums 4 and 5 called reel stands connected to the IJ reel shafts 2 and 3, A flywheel 6 coupled to a capstan motor, a capstan 7 coupled to this flyboiler 6, selectively interposed between the flywheel 6 and the take-up rotating drum 5, and rotating the drum 5 during recording or reproduction. A motor pulley 9 is connected to an idler 8 for fast forwarding and rewinding, and a belt 1o is connected to this motor pulley 9.
A magnetic head is connected to a pulley 11 for fast forwarding and rewinding that rolls into contact with the right drum 5 during fast forwarding and rolls into contact with the left drum 4 during rewinding, and a head substrate 13 that slides by the bias of a play plunger solenoid 12. 14, and a brake mechanism 17 configured to separate from the left and right drums 4, 5 by the urging of a brake plunger solenoid 16.

Further, in connection with the tape running mechanism 1 described above, a brake mechanism 19 for setting a tape slack removal mode is provided which brakes the drum 4 on the tape supply side (left side) in response to the energization of a plunger solenoid 18 for setting a tape slack removal mode. It is being

Reference numeral 20 denotes an operation unit that is operated to set the tape traveling mechanism 1 to a predetermined mode, and is used to control functions such as a play switch, fast forward switch, rewind switch, and stop switch.

Reference numeral 21 denotes an operation storage section connected to the operation section 20 and configured to store operations of the operation section 20, and in this embodiment, it is constructed of a flip-flop.

Reference numeral 22 denotes a power switch for the cassette deck, which, when turned on, puts various circuits into operating or operable states.

Reference numeral 23 denotes a cassette loading detection switch, which is a microswitch provided at a position where the cassette is closed when the cassette is loaded in a position where the tape can run.

In this embodiment, the power switch 22 and the loading detection switch 23 are connected in series through a power supply circuit (not shown), and both switches 22 and 23 are turned on and the A is turned on.
When the ND output is obtained, the tape slack removal signal generating circuit 24 at the next stage starts operating.

The tape slack removal signal generation circuit 24 generates a first tape slack removal signal from the first line 24a in response to turning on the power switch 22 and turning on the cassette loading detection switch 23 as described above, and generates a first tape slack removal signal from the line 24b. A second tape slack removal signal is generated.

The first tape slack removal signal corresponds to a tape slack removal drive preparation signal, and the second tape slack removal signal is a signal for actually winding and driving the tape.

In this embodiment, the tape slack removal signal generated from the tape slack detection section 25 is applied to the tape slack removal signal generation circuit 24 via the transmission control circuit 26. The first and second tape slack removal signals disappear.

However, the L1 tape slack removal signal generation circuit 24 also has a function of generating the first and second tape slack removal signals over a period close to the drive period required to remove tape slack, regardless of the tape slack removal signal. Therefore, even if the tape slack detection section 25 cannot obtain a tape slack detection signal due to a failure of the tape slack detection section 25 or disconnection of the tape slack detection section 25, the tape slack removal drive is stopped after a predetermined period of time.

The tape slack detection section 25 detects the stoppage of the rotation of the take-up reel shaft 3 during the tape slack removal drive, thereby detecting the stoppage of tape running, that is, the absence of tape slack.

The transmission control circuit 26 is a circuit that cuts off the connection between the tape slack detection section 25 and the tape slack removal signal generation circuit 24 for a certain period of time from the start of tape slack drive, and the transmission control circuit 26 is a circuit that interrupts the connection between the tape slack detection section 25 and the tape slack removal signal generation circuit 24 for a certain period of time from the start of tape slack drive. The cut-off operation is performed only for a certain period of time in response to the slack removal signal.

The provision of this circuit prevents a false tape slack signal from being transmitted at the beginning of tape slack removal.

The tape running mechanism control circuit 27 operates the tape running mechanism 1 in response to the memory output of the operation storage unit 21 during a period when the first and second tape slack removal signals are not generated from the tape slack removal signal generation circuit 24. The tape transport mechanism 1 is controlled to operate in a mode corresponding to the stored content, and during a period when the tape slack removal signal is generated from the tape slack removal signal generation circuit 24, the tape running mechanism 1 is operated in a mode corresponding to the stored content in the operation storage section 21. The tape running mechanism 1 is configured to prevent the tape running mechanism 1 from operating in the tape slack removal mode and to operate the tape running mechanism 1 in a tape slack removal mode in response to the tape slack removal signal.

The first tape removal signal is used to prevent the tape transport mechanism 1 from operating in a mode other than the tape slack removal mode, and the second tape slack removal signal is used to prevent the tape transport mechanism 1 from operating in a mode other than the tape slack removal mode.
is used to operate in tape slack removal mode.

Therefore, when the second tape slack removal signal is input to the tape transport mechanism control circuit 27, in this embodiment, the tape transport mechanism 1 operates in the tape slack removal mode, which is almost the same as the fast forward mode, and the fast forward motor is activated. Pool pool 1
1 comes into contact with the right drum 5, the right notram 5 rotates counterclockwise, and the slack tape is wound up.

At this time, of course, the brake plunger solenoid 16 is also energized, and the braking by the brake mechanism 17 is released.

However, the left drum 4 is braked by a tape slack removal mode setting brake mechanism 19 which is actuated by the plunger solenoid 18.

Therefore, the tape is wound onto the right reel while the left reel shaft 2 and the reel engaged therewith are fixed, and the slack is absorbed.

The brake control circuit 28 that controls the tape slack removal setting plunger solenoid 18 is configured to supply power to the plunger solenoid 18 in response to the first tape slack removal signal obtained from the tape slack removal signal generation circuit 24. There is.

Therefore, when the slack in the tape is eliminated, the plunger solenoid 18 is not energized and the brake mechanism 19 is in a non-braking state.

Next, FIG. 2 will be described which shows each part of the tape deck shown in FIG. 1 in more detail.

In this FIG.
The portions indicated by the dots approximately correspond to the portions indicated by the same reference numerals in FIG.

First, the operating section 2o shown surrounded by a dotted line consists of a play switch 20a with normally open contacts, a fast forward switch 20b, and a rewind switch 20c.

One contact of the husband's switches 20a, 20b, 20c is grounded, and the other contact is coupled to the set terminal S of each flip-flop 21a, 2lb, 21c that monitors the operation storage section 21.

Since the set terminals S of the respective flip-flops 21a, 2lb, and 21c are also connected to the positive bias power supply terminal 10B via a resistor, the respective operation switches 20a, 20
When b and 20c are turned on and a set signal of i-ground level is applied to the set terminal S, the output state is reversed and the operation is stored.

That is, the flip-flops 21a, 2lb, and 21c are all configured so that when set, the Q output terminal becomes a low level state.

Although not shown, a record switch and a flip-flop for storing this operation are also provided.

A stop switch 29 is also provided, and when this is turned on, a ground level reset signal is applied to the IJ set terminal R of the husband's flip-flops 21a, 21b, 21c via the diode.
1b and 21c are reset, Q output terminal is low level,
d output terminal becomes high level.

Q of each flip-flop 21a, 2lb, 21c
The output terminal is coupled through an inverter and a diode to the reset terminal of another flip-flop, so that when any one flip-flop is set, the remaining flip-flops are reset.

The tape running mechanism control circuit 27 shown surrounded by a dotted line is connected to the play operation storage flip-flop 21a. A play control transistor Q1.7 is provided correspondingly to the play control transistor Q1.7, a fast-forward control transistor Q18 is provided corresponding to the fast-forward operation memory flip-flop 2lb, and a fast-forward control transistor Q18 is provided corresponding to the rewind operation memory flip-flop 21c. and a rewind control transistor Q19.

The bases of these transistors Q17, Q18, Q, and 9 are coupled to the Q output terminals of the respective flip-flops 21a2lb and 21c via the respective resistors R3o, R31, and R32, and the respective emits are respectively grounded and the respective The collectors of are connected to the positive bias power supply terminal 10B through respective resistors R33, R34, and R35.

Furthermore, base resistors are connected between each base and the bias power supply terminal 10B and between each base and ground.

For this reason, the flip-flops 21a, 2lb. When 21c is in the set state and the 0 output terminal is at a low level, the respective transistors Q1, Q18, Q1, are turned off, and the flip-flops 21a, 2lb, 21c are in the reset state and the Q
When the output terminal is at a high level, it is biased by the base bias resistor and the respective transistors Q+7 1 Q18
1 Qto is turned on.

The collector of the play control transistor Q17 is connected to the base of the transistor of the play control switch circuit 3o, so it is a transistor.

, 7 is off, the switch circuit 30 is turned on, and the play plunger solenoid 12 connected between the switch circuit 30 and the power terminal 10B is energized, and the connection between the switch circuit 3o and the power terminal 10B is activated. A brake plunger solenoid 16 connected therebetween is energized.

On the other hand, if the base of the play control transistor Q1 becomes high level and the transistor Q1 is turned on, the switch circuit 3o is turned off.The collector of the fast-forward control transistor Q18 is connected to the fast-forward control switch circuit 31 via the diode D3. Since this transistor Q8 is connected to the base of the transistor Q8, the switch circuit 31 is turned on when this transistor Q8 is turned off.
A diode D is connected between the switch circuit 31 and the power supply terminal 10B.
The brake plunger solenoid 16 connected through the switch circuit 31 and the power terminal 1B is energized.
A fast-forwarding motor 32 connected between the two is energized.

When the base of transistor Q18 is at a high level, transistor Q18 is turned on and switch circuit 31 is turned off.

The collector of the reverse fast forward or rewind control transistor Q19 is connected to the base of the transistor of the rewind switch circuit 33 via the diode D4.
When transistor Q19 is off, switch circuit 33 is turned on, relay coil 34 between switch circuit 33 and power supply terminal 10B is energized, and switches S, , S2
is switched from contact a to contact b.

Further, the collector of the transistor Q1 is also connected to the fast-forward switch circuit 31 via the diode D4, so that when the transistor Q19 is off, the switch circuit 3
1 is turned on, the brake plunger solenoid 16
And the fast-forwarding moke 32 is energized.

Therefore, the relay coil 34 is used only for switching the power of the motor 32.

The rapid feed motor 32 is the motor pulley 9 shown in FIG.
When this rotates in one direction, the pulley 1 attached to the rotating rod (not shown) rolls into contact with the drum 5 on the right side, causing fast forward movement in the forward direction, and when it rotates in the other direction. When rotated, the pulley 11 rolls into contact with the left drum 4 and enters a rewinding state.

A deck power switch 22 is provided between the AC power terminal 35 and the DC power circuit 36, and a capstan motor 37 is provided between the output of the power circuit 36 and ground via a cassette loading detection switch 23. .

Therefore, when both the power switch 22 is turned on and the switch 23 is closed due to loading of the cassette, the capstan motor 37 starts rotating, and the capstan 7 and flywheel 6 shown in FIG. 1 rotate.

Further, one end of the loading detection switch 23 is connected to the transistor Q1 in the tape slack removal signal generation circuit 24 via a resistor.
Since the transistor Q1 is connected to the base of the transistor Q1, when both the power switch 22 and the loading detection switch 23 are turned on, the transistor Q1 is turned on.

That is, as shown in FIG. 3A, if, for example, the power switch 22 is first turned on at time t1 and the loading detection switch 23 is turned on at time t2, the AND output of the two switches the transistor Q0 to the state shown in FIG. 3C. As shown, it is turned on from time t2.

In FIG. 3, turning on the power switch 22 precedes loading the cassette, but the same operation occurs in the reverse case.

When transistor Q1 is turned on, this collector ? Since the level becomes low, transistors Q2 and Q3, whose collectors are connected to their bases, are turned off.

The collector of transistor Q2 is connected to the power supply terminal 10B via resistor R1, the emitter is grounded, the collector is connected to the base of transistor Q8 via resistor R2, and the base of transistor Q9 via resistor R3. Since they are connected, when transistor Q2 turns off in response to turning on transistor Q1, transistor Q8 and transistor Q9 in the next stage turn on.

Since the transistor Q8 is connected in series to the positive power supply line, it functions as a power switch for the subsequent transistors Q3, Q4, Q5, etc.

The collector of NPN} transistor Q3 is connected to the power supply via resistor R4, the emitter is grounded, and the base is connected to a bias resistor, so it is turned on while transistor Q1 is off, but when transistor Q1 is When turned on, the base goes low and turns off, leaving its collector in a high state.

Therefore, a diode D is connected to the collector of transistor Q3.
The collector of the transistor Q9 connected through the transistor Q5 also becomes high level.

A divider circuit consisting of resistors R and R6 is connected in parallel to the transistor Q3, one end of the capacitor C1 is connected to the connection point between the resistors R5 and R6, and the other end of the capacitor C1 is connected to a reverse diode D6. is connected to the base of the transistor Q4 via the diode D7 and the resistor R7, so the transistor Q
When 3 is turned off. +B power supply voltage is applied to resistor R4, . R5
, R6, and the voltage is supplied to the capacitor C1, and a differential pulse is obtained at the output stage of the capacitor C1.

When a high level signal of a certain time width is applied to the base of the transistor Q4 through a certain ripple removal circuit from the diode D7 and the capacitor C2 and a base circuit formed from the resistor R7 and the resistor R8, the transistor Q4 is turned on. Become.

The collector of the transistor Q4 is connected to the 10B power supply line via a resistor R9, and is also connected to the base of the next stage transistor Q5 via a resistor RIO.

Also, this emitter is connected in common with the emitter of the next stage transistor Q, and then grounded via a resistor R11.
A resistor R is connected between the base of transistor Q5 and the ground line.
1 is connected, and resistor R13 is connected between the collector of transistor Q5 and the power supply line? Since it has a Schmitt circuit structure, when transistor Q4 turns on, it becomes a transistor.

5 is off.

The collector of the transistor Q5 is connected to the base of the transistor Q6, which is connected in series to the power supply line, via the resistor R,4, so it is a transistor.

When Q5 turns off, transistor Q6 turns on.

Also, when transistor Q5 is off in response to the differential pulse, its collector is at a high level;

, is forward biased.

When the transistor Q6 is turned on as described above, the first tape slack removal signal is sent from the ]th line 24a, and is supplied to the tape traveling mechanism control circuit 27 and the brake control circuit 28.

In addition, in order to obtain a second tape slack removal signal from the second line 24b, a resistor R15 and a resistor R1 are connected to the ground via a diode D9 between the line 24a and the ground line.
A voltage divider circuit is provided from 6 and 6, and a resistor R15 and a resistor R
One end of capacitor C3 is connected to the connection point with 06, and the other end of capacitor C3 is connected to diode D.
Transistor via IO and resistor R1.

A diode Dll is connected in the opposite direction between the other end of the capacitor c3 and the ground line, and a ripple removal capacitor c4 is connected between the cathode of the diode D1o and the ground line. , a resistor R17 is connected between the base of the transistor Q7 and the ground line.

Since the emitter of the NPN transistor Q7 is grounded, when the differential pulse obtained by the capacitor C3 is applied to this pace, it turns on and its collector becomes grounded.

In this embodiment, the width of the first differential pulse obtained from the first differential circuit including capacitor c1 is smaller than the width of the second differential pulse obtained from the second differential circuit including capacitor c3.

Therefore, if transistor Q6 is not controlled by SiRisk (hereinafter referred to as SCR), transistor Q
6 is turned on only during the first period T1 as shown in FIG. 3D, and the transistor Q7 is turned on only during the second period T2 which is shorter than the first period T1 as shown in FIG. 3E.

But transistors. transistor when 6 is SCR controlled.

Almost at the same time as transistor Q6 turns off, transistor Q7 also turns off.

? The first line 24 is the output line of transistor Q6.
A is connected to the base of the transistor Q12 of the brake control circuit 28, which is shown surrounded by a dotted line, via a resistor R18.

transistor. Since the emitter of transistor 12 is grounded, it is also turned on during the period when transistor Q6 is on.

This transistor. A resistor R19 is connected between the emitter of the transistor Q12 and the ground line, and the emitter of the transistor Q12 is connected to the base of the next stage transistor Ql3.
The emitter of transistor Q13 is grounded.

Since the brake plunger solenoid 18 and the diode D12 are connected between the collector of the transistor 13 and the power supply terminal 10B, the former transistor.

1 is turned on, the subsequent transistor Q13 is also turned on, and the brake plunger solenoid 18 is energized.

As a result, the brake mechanism 19 operates as described in FIG. 1, the supply side drum 4 is braked, and the reel shaft 2 is fixed.

The first line 24a is connected to a transistor for controlling P1/I via a diode D13 and a resistor R2o.

It is also connected to the base of 17.

Therefore, during the period when the transistor Q6 is on and the first tape slack removal signal is obtained from the first line 24a, the play control transistor Q17 is turned on regardless of the output of the flip-flop 21a, and the play switch circuit 3o is turned off and the play mode is inhibited.

Also, the first line 24a has a diode D14 and a resistor R2.
1 and a rewind control transistor.

1, is connected to the base of.

Therefore, when the first tape slack removal signal is generated on the first line 24a, the transistor Q19 is turned on and the rewinding switch circuit 33 is turned off.

Therefore, a rewind mode inhibited state is obtained.

The first line 24a is also connected to a transmission control circuit 26 shown enclosed by a dotted line via a diode DI5 and a resistor R2, and is used to control the slack detection signal, which will be described in detail later.

The second line 24b is connected to the base of the fast-forward control transistor Q.

Therefore, when the transistor Q7 is turned on and the second tape slack removal signal at ground level is generated on the second line 24b, the fast forward control transistor Q7 is turned on.

18 is turned off regardless of the output of flip-flop 2lb, and the fast-forward switch circuit 31 is turned on, causing the fast-forward motor 32 and the brake plunger solenoid 16 to turn off.
is energized.

This starts the tape slack removal drive in the fast forward mode.

A magnet 38 having an N pole and an S pole arranged at a predetermined interval is coupled to the right reel shaft 3, and a Hall element 39 is arranged in the vicinity where the magnet 38 passes, so that the rotation of the reel shaft 3 is controlled by the Hall element. 39 can be detected.

That is, the left reel shaft 2 is fixed and the right reel shaft 3 is driven to remove tape slack in fast-forward mode, and the right reel shaft 3 rotates while the tape slack is being absorbed, so that the magnet 38
The tape also rotates, and the Hall element 39 detects that the tape is slack.

Then, when the tape slack disappears and the rotation of the right reel shaft 3 stops, the output voltage of the magnetic Hall element 39 stops changing, and a tape slack-free signal is obtained.

In this embodiment, since the Hall element 39 is also used to detect the end of the tape, a tape end detection circuit 40 is connected, and when the end of the tape is detected, a reset signal is applied to the flip-flops 21a, 2lb, and 21c. is configured to be

Both ends of the Hall element 39 are connected to the bases of a pair of transistors Q14 and Q15, respectively, which form a differential amplifier.

The emitters of the pair of transistors Q14 and Q15 are connected in common and grounded via a resistor R23, and a load resistor R is connected between the collector of the transistor Q15 and the power supply terminal 10B.
24 is connected, and the collector of the transistor Q15 is connected to the base of the transistor Q16 via a capacitor C, and a diode I)ta and a resistor R25 are connected between the base of the transistor Q16 and the ground line.
Since the resistor R26 is connected between the collector of the transistor Q16 and the power supply terminal 10B, the output voltage of the Hall element 39 is changing due to the rotation of the right reel shaft 3 and the magnet '3! During the period when sagging occurs),
A signal corresponding to the output of the Hall element 39, which changes AC, passes through the capacitor C, and is connected to the transistor Q. The base potential of transistor Q16 changes, and transistor Q16 repeatedly turns on and off.

On the other hand, when the tape slack is absorbed and the reel shaft 3 and magnet 38 stop rotating, the output voltage of the Hall element 39 also stops changing, the direct current is blocked by the capacitor C, and the transistors Q and 6 are kept in the off state. drooping

? A capacitor C6 is connected between the collector of the transistor Q16 and the ground line via a resistor R2.

Furthermore, a Zener diode ZD is connected between the connection point between the capacitor C6 and the resistor R27 and the gate of the SCR.

In such a circuit, transistor Q16 is turned on.
If the capacitor C6 is repeatedly turned off, the charging voltage of the capacitor C6 does not rise to a level at which the Zener diode ZD becomes conductive.

That is, while the transistor Q16 is off, the capacitor C
Even if the capacitor C6 is charged to some extent, it is discharged in a certain circuit from the resistor R2 and the transistor Q16 during the ON period of the transistor Q16, and the charging voltage of the capacitor C6 does not rise.

However, the slack in the tape is absorbed and the Hall element 39
When there is no change in the output voltage of and transistor Q16 is held off, capacitor c6 continues to be charged, and finally Zener diode ZD becomes conductive and SCR is turned on.

As shown in FIG. 3, when the SCR gate signal is applied at the <14 time point and the SCR is turned on, the base of the transistor Q6 is connected to the resistor R14, the diode D8, and the transistor Q.
9. It becomes low level in the SCR circuit and transistor Q6 is turned off.

At this time, since the collector of the transistor Q3 also becomes low level, the first differential pulse also disappears, and the transistor Q6 is surely turned off.

When transistor Q6 is turned off, transistor Q7 is also turned off, and the high level first tape slack removal signal that was available from first line 24a and second line 24
The low level second tape slack removal signal obtained from signal b disappears.

As a result, the brake plunger solenoid 18 is deenergized, the braking by the brake mechanism 19 is released, and the state in which the play control transistor Q17 and the rewind control transistor Q19 are forcibly turned on is also released. .

Furthermore, when the second line 24b becomes high level, the fast-forward control transistor Q18 is turned on, the switch circuit 31 is turned off, the fast-forward motor 32 and the brake plunger solenoid 16 are deenergized, and the tape The winding drive, that is, the tape slack removal drive ends.

By the way, even when the power switch 22 and the cassette loading detection switch 23 are turned on, the reel shaft 3 and the magnet 38 do not start rotating immediately, but after a little delay? Therefore, it is necessary to distinguish between rotation stoppage due to this delay and rotation stoppage after removal of tape slack.

Therefore, the first line 24a is connected to the base of the transistor Q1o via the diode DI5, the resistor R22, and the diode I)t'y, and a delay capacitor C7 is connected between the anode side line of the diode D1 and the ground line. The emitter of the transistor Q1o is grounded, the collector is connected to the power supply terminal 10B via the resistor R29, and the base of the transistor QIO is connected to the transistor QIO. Connected in parallel to a series circuit.

As a result, even when the first tape slack removal signal is sent from the first line 24a, transistor QIO is not turned on immediately, transistor Q1 is not turned off immediately, and delay capacitor C7 turns on transistor QIO. Transistor QIO is turned on after it has been charged to a level that allows the transistor to turn on.

1 is turned off.

Transistor Q1, resistor R2 at the same time as the +B power is turned on.
Since it is turned on through 9, the transistor QIO
The charging of the capacitor C is prevented until the capacitor C is turned off at time t3 as shown in FIG. 3H.

Therefore, before time t3, transistor Q. Even if capacitor C6 does not perform an on/off operation and remains off, and the discharge circuit of capacitor C6 is cut off by transistors Q and 6, charging of capacitor C6 is not performed and charging starts after t3.

Therefore, the period t2 to f3 is set to be longer than the start-up time of the tape winding mechanism.

Note that transmission blocking by the transistor Qll naturally occurs even when there is no slack in the tape from the beginning.

When the first tape slack removal signal on first line 24a disappears at time t4 in FIG. 3, transistor QIO turns off and transistor Q1 turns on after a delay time due to capacitor C7.

Therefore, the SCR gate signal also disappears at this point.

However, since a current higher than the holding current flows through the SCR, it is kept on.

As is clear from the above, in this tape deck, when a cassette is loaded and the power switch 22 is turned on, or when the power switch 22 is turned on and a cassette is loaded,
The tape slack removal mode is automatically obtained and the tape slack is absorbed.

Therefore, is it possible to record or play back without tape slack? This enables high-quality recording or playback from the beginning.

Moreover, in this device, the play control transistor Q1 in the output stage of the play flip-flop 21a and the rewinding flip-flop 21c? In response to the tape slack removal signal, the rewind control transistor Q19 enters the play and rewind inhibiting state, and the fast forward control transistor Q1
8 operates to obtain the tape slack removal mode, not only is there no risk of switching to a mode other than the tape slack removal mode by mistake, but the next mode can be set during the tape slack removal mode. .

For example, when the play switch 2 is in the tape slack removal mode,
When 0a is operated, flip-flop 21a is set and held.

This causes the Q output terminal of flip-flop 21a to go low, but since resistor R30 is connected, the high level signal on first line 24a overcomes this and turns on transistor Q17.

Prevent responding to output.

Therefore, the play mode is not entered in response to a play operation during the tape slack removal mode.

However, when the tape slack removal mode ends and the high level tape slack removal signal is no longer applied to the base of the transistor Q17, the operation is already stored in the flip-flop 21a, so the low level output from the G output terminal is This turns off the transistor Q1 and enters the play mode.

Therefore, even though the tape slack removal mode is provided, the play state can be obtained relatively quickly.

Furthermore, since the mode can be set regardless of whether or not the tape slack removal mode is present, operability does not deteriorate.

Although the setting of the play mode has been described above, the same operation occurs when setting the recording, fast-forwarding, or rewinding mode.

If the tape provided with the tape slack detection section 25 has no slack from the beginning or has little slack, the tape slack removal mode can be stopped based on the detection that there is no slack.

Therefore, the tape slack removal mode period can be made as short as possible.

In addition, in this device, the transmission of the tape slack detection output is controlled by the first tape slack removal signal, and the tape slack detection signal is not transmitted for a certain period of time after the rise of the tape slack removal mode, so that the tape slack detection signal is not transmitted reliably. Completion of slack removal can be detected.

Furthermore, since the transmission control circuit 26 is configured to be controlled by the first tape slack removal signal, it is possible to block the transmission of the slack detection output for a certain period of time in precisely synchronized with the rise of the tape slack removal mode. I can do it.

In addition, the transmission control circuit 36 operates even after tape slack removal is completed, so that the gate signal is applied to the SCR only for a certain period of time, so that the gate signal is not supplied to the SCR more than necessary. Limited.

In addition, a brake mechanism 19 is provided that operates in the tape slack removal mode, and in the tape slack removal mode, the supply side reel shaft 2 is fixed and the take-up side reel shaft 3 is driven, so that the tape slack can be removed in a stable state. In addition, it is possible to prevent the tape from changing its position.

Furthermore, if the tape slack detection section 25 fails, or if the switch S is opened as necessary so that the tape slack removal signal generation circuit 24 does not respond to the tape slack detection output, the first Transistor Q6 is turned on for a period of T1 shown in FIG. 3D based on the differentiating circuit of FIG.
Turns on for a period of time.

Since the T period and the T2 period are set to the maximum period necessary for normal tape slack removal, the tape slack removal drive can be performed regardless of tape slack detection.

Also, since T1>T2, the brake mechanism 1
9 is not released, and the tape does not run unnecessarily.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be further modified.

For example, it may be possible to change the period T0 determined by the differentiating circuit including the capacitor C1 and the period T2 determined by the differentiating circuit including the capacitor C3.

In addition, a device is installed to detect the tape winding diameter on the reel.
The periods T1 and T2 in FIG. 3 may be changed to optimum values depending on the tape winding diameter.

Also, in the embodiment, the power switch 22 and the cassette loading detection switch 23? The capstan motor 37 is connected after being connected in series, so that the capstan motor 37 does not rotate only when the power is turned on, and the undesirable rotation of the capstan motor 37 is suppressed as much as possible. The capstan motor 37 may be connected elsewhere.

Also, the power switch 22 and the cassette loading detection switch 23
The switches 22 and 23 may be provided in each input circuit of the two-man power AND circuit without connecting them in series.

Furthermore, although the embodiment is applied to a two-motor type tape deck, it is also applicable to a three-motor or one-motor type tape deck or tape recorder.

In addition, tape slack detection is not based on the rotation of the reel axis.
It may be detected by changes in the current of the reel drive motor, or
It may be detected directly based on the presence or absence of tape running, or
Detection may also be based on tape tension.

In addition, in the embodiment, tape slack is removed using a fast forwarding mechanism, but instead of bringing the magnetic head into sliding contact with the magnetic tape, the pinch roller is brought into rolling contact with the capsun, and the tape slack is removed by capstan drive. Good too.

Furthermore, when tape slack is removed using the fast forward mode, the strength of the reel drive may be changed to suit the tape slack removal.

Further, in the embodiment, the slack of the tape is absorbed by driving the take-up reel, but the slack of the tape may be absorbed by driving the supply reel.

Detection of loading of a cassette may be performed by other means such as photoelectric or electromagnetic, rather than mechanically closing a microswitch.

Furthermore, instead of providing an independent brake mechanism 19 for fixing one reel, the normal brake mechanism 17 may be divided for each reel shaft, thereby braking one reel shaft.

Further, in the case of a three-motor system having a pair of reel motors, one reel shaft may be electromagnetically braked by the reel motor.

Further, in the embodiment, when the transistors Q17, Q18, Q1 are off, the switch circuits 30, 31 . Although the switch circuit 33 is configured to be turned on, the switch circuit 30, 31, and 33 may be configured to be turned on when the switch circuit 33 is turned on.

In addition, the transistor Q1I Ql 3 N Ql of the embodiment
9 is replaced with a flip-flop, and the power switch 22 is replaced.
Q1 in response to turning on both the and loading detection switch 23.
The flip-flop in place of Q17 and Q19 is set and the switch circuit 31 is turned on. A reset signal (inhibition signal) may be continuously applied to the flip-flop during tape slack removal.

Furthermore, in the embodiment, tape slack removal is driven with one reel shaft 2 fixed, but it may be done without fixing it, or both reels can be rotated in opposite directions to remove tape slack. You may.

Further, it is also applicable to a device in which a power plug is used instead of a power switch without providing a special power switch 22.

Also, the first line 24a is connected to the bases of transistors Q1 and Q19, and the second line 24b is connected to the bases of transistors Q1 and Q19.
18, a further switch may be provided, for example between the flip-flops 21a, 21c and the switch circuit 30.33, the switch being responsive to the first tape slack removal signal on the first line 24a. The flip-flops 21a. The switch circuits 30 and 33 may be configured not to respond to the memory contents of 21c.

In this case, instead of connecting the second line 24b to the base of the transistor Q18, a set signal is applied to flip-flop 2lb in synchronization with the start of tape slack removal, and a set signal is applied to flip-flop 2lb in synchronization with the completion of tape slack removal. A reset signal may also be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a tape deck according to an embodiment of the present invention with some parts omitted, FIG. 2 is a specific circuit diagram of the tape deck of FIG. 1, and FIG. It is a time chart showing the state of points A to 1 of . In the symbols used in the illustration, 1 is the tape running mechanism, 2 and 3 are the reel shafts, 4 and 5 are the drums, 7 is the capsun, 12 is the plunger solenoid for play, 16 is the plunger solenoid for the brake, and 17 is the plunger solenoid for the brake. Brake mechanism. 18 is a plunger solenoid for setting the tape slack removal mode, 19 is a brake mechanism for setting the tape slack removal mode, 20 is an operation section, 21 is an operation storage section, 21a, 2l
b, 21c are flip-flops, 22 is a power switch,
23 is a cassette loading detection switch, 24 is a tape slack removal signal generation circuit, 25 is a tape slack detection section, 26 is a transmission control circuit, 27 is a tape traveling mechanism control circuit, and 28 is a brake control circuit.

Claims (1)

[Claims] 1. A tape running mechanism for running the tape of a cassette, and a power supply circuit for driving the tape running mechanism are turned on and off.
a power switch that turns off a power switch, a loading detection switch that detects that the cassette is loaded in a position where the tape can run, and a play operation section that is operated to put the tape drive mechanism into a play mode; The slack removal of the tape is substantially completed from the time when both the play operation storage unit configured to store the play operation of the play operation unit, the power switch and the loading detection switch are activated. a tape slack removal signal generation circuit that generates a tape slack removal signal during the period up to the point in time when the tape slack removal signal generation circuit is coupled to the play operation storage unit and the tape slack removal signal generation circuit, respectively; Controlling the tape running mechanism so as to operate the tape running mechanism in a mode corresponding to the stored content in response to the storage output of the play operation storage unit during a period when the tape slack removal signal is not generated; The tape running mechanism operates in a mode corresponding to the content stored in the play operation storage unit in response to the tape slack removal signal during a period when the tape slack removal signal is generated from the tape slack removal signal generation circuit. A cassette-type tape transport device, comprising: a tape transport mechanism control circuit configured to prevent the tape transport from occurring and to operate the tape transport mechanism in a tape slack removal mode. 2. The play operation storage unit is a play flip-flop that stores play operations, and the tape running mechanism control circuit includes a play control transistor that sets a play state in response to the output of the play flip-flop, and a play control transistor that sets a fast forward state. f) a fast-forward control transistor; in response to the tape slack removal signal, the play control transistor f) enters an S play inhibiting state operation; and in response to the tape slack removal signal, the fast-forward control transistor operates in a fast-forward state. Claim 1, wherein the output of the tape slack removal signal generation circuit is coupled to the play control transistor and the fast forward control transistor so as to operate the tape slack removal signal generation circuit.
The cassette type tape transfer device described in Section 1.