JPS5810775B2 - 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 housed in a tape cassette, and more particularly, to The present invention relates to a cassette-type tape transfer device equipped with a mechanism for automatically removing tape slack.

For example, immediately after a magnetic tape cassette is loaded into a tape recorder or tape deck, the magnetic tape becomes slack in the transport 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 drawback, a method is already known in which the tape is driven in a fast forward mode or the like for a certain period of time after loading the cassette, and the slack in the tape is automatically removed.

However, if the tape slack is absorbed only in the normal fast-forward mode, the tape position may shift or the tape slack may not be absorbed satisfactorily.

Furthermore, if a recording or playback operation is performed during the tape slack removal period, there is a risk that recording or playback will start before the tape slack has been completely absorbed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cassette type that absorbs tape slack so as not to cause unnecessary tape running, and that starts tape running for recording or playback after completely removing tape slack. The object of the present invention is to provide a tape transport device.

To achieve the above object, the present invention includes a tape running mechanism for running the tape of a cassette between a pair of reels, a loading detection switch that detects loading of the cassette into a position where the tape can run, a power switch, and a time width required for tape slack removal or a time width slightly larger than the required time width, coupled directly or indirectly to the load detection switch, in response to actuation of both the power switch and the load detection switch; a tape slack removal signal generation circuit that generates a first tape slack removal signal and a second tape slack removal signal; a braking device that applies a brake to one of the reels in the cassette in response to a removal signal; and a braking device that is coupled to the output of the tape slack removal signal generating circuit to apply a brake to one of the reels in the cassette in response to the second tape slack removal signal. a tape running device configured to drive the other reel in the tape winding direction, and to prohibit the running mechanism from operating in a mode other than tape slack removing drive in response to the first tape slack removing signal. The present invention relates to a cassette-type tape transfer device equipped with a mechanism control circuit.

According to the present invention, the first tape slack removal signal applies braking to one reel and prohibits operation in modes other than tape slack removal drive, and the second tape slack removal signal applies tape slack removal. Since the removal mode is set, tape slack is removed with one reel fixed.

Therefore, if the slack in the tape is removed, the tape will stop running, and the tape will not run unnecessarily.

Further, since modes other than the tape slack removal drive mode are prohibited, recording or reproduction will not start in a state where tape slack removal is incomplete.

Embodiments of the present invention will be described below 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 an embodiment of the present invention, a tape running mechanism 1 for running a magnetic tape of a cassette (not shown) is surrounded by a dotted line. Shown descriptively.

This tape running mechanism 1 includes a pair of reel shafts 2 and 3 that engage with a pair of reel hubs in a cassette, a pair of rotating drums 4 and 5 called reel stands connected to the reel shafts 2 and 3, and a capstan. A flywheel 6 coupled to the morph, a capstan 7 coupled to the flywheel 6, and a capstan 7 selectively interposed between the flywheel 6 and the take-up rotating drum 5 to rotate the drum 5 during recording or reproduction. An idler 8, a motor pulley 9 connected to a motor for fast forwarding and rewinding, and a belt 10 connected to the motor pulley 9, for fast forwarding and rewinding, which is connected to the drum 5 on the right side during fast forwarding and to the drum 4 on the left side during rewinding. It is provided together with the magnetic head 14 on a head substrate 13 that slides under the force of a pulley 11 and a play plunger solenoid 12, and is moved away from the left and right drums 4 and 5 by the force of a pinch roller 15 and a brake plunger solenoid 16. It consists of a brake mechanism 17 configured.

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 operating section which is operated to put the tape traveling mechanism 1 into a predetermined mode, and includes a play switch, a fast forward switch, a rewind switch, a stop switch, and the like.

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

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

Reference numeral 23 denotes a cassette loading detection switch, which is a microswitch provided at a position that closes 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 via 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 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 driving period essential for tape slack removal, regardless of the tape slack removal signal. Therefore, even if no tape slack signal is obtained from the tape slack detection section 25 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 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.

By providing this circuit, it is possible to prevent an erroneous tape slack removal signal from being transmitted at the start of tape slack removal. During the period when the tape slack removal signal No. 2 is not generated, the operation storage section 2
1, the tape running mechanism 1 is controlled to operate in a mode corresponding to the stored content in response to the storage output of 1, and the tape slack removal signal is generated from the tape slack removal signal generation circuit 24. The operation storage unit 21
The tape transport mechanism 1 is configured to prevent the tape transport mechanism 1 from operating in a mode corresponding to the stored contents of the tape transport mechanism 1, and to operate the tape transport mechanism 1 in a tape slack removal mode in response to a 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 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 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. pulley 1
1 comes into pressure contact with the right drum 5, the right drum 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 the tape slack removal mode setting brake mechanism 19G, which is activated by the plunger solenoid 18.

Therefore, the tape is wound onto the right reel while the left reel shaft 2 and the reel that engages with it 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 a first tape slack removal signal obtained from the tape slack removal signal generation circuit 24. .

Therefore, when the tape is no longer slack, the plunger solenoid 18 is deenergized and the brake mechanism 19 is brought into 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 Figure 2, the numbers 12.16.18.20 to 28
The portions indicated by the dots approximately correspond to the portions indicated by the same reference numerals in FIG.

First, the operating section 20 shown surrounded by a dotted line is composed of a play switch 20a, a fast forward switch 20b, and a rewind switch 20C, each of which has a normally open contact configuration.

One contact of the husband's switches 20a, 20b, 20C is grounded, and the other contact is the flip-flop 21a, 21b that constitutes the operation storage section 21.

It is coupled to the set terminal S of 21c.

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

That is, each of the flip-flops 21a, 21b, and 21C is configured so that when set, the Q output terminal becomes a low level state.

Although not shown, a recording 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, the respective flip-flops 21a, 21b, 21C (
7) A ground level reset signal is applied via the IJ set terminal terminal diode, and the flip-flops 21a,
21b and 21c are reset, and the Q output terminal becomes low level and the Q output terminal becomes high level.

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

The tape running mechanism control circuit 27 shown surrounded by a dotted line includes a play control transistor Q17 provided corresponding to the play operation storage flip-flop 21a, and a fast-forward control transistor Q17 provided corresponding to the fast-forward operation flip-flop 21b. It has a transistor Q18 and a rewind control transistor Q19 provided corresponding to the rewind operation storage flip-flop 21C.

The bases of these transistors Q17, Q18 and Q19 are connected to the respective flip-flops 21a via respective resistors R30, R31 and R32.

21b and 21c, the emitters of the husband and wife are respectively grounded, and the collectors of each are connected to the respective resistors R.
33, R34, and R35 to the positive bias power supply terminal B, respectively.

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

For this reason, the flip-flop 21a. When 21b and 21C are set and the Q output terminal is at a low level, the respective transistors Q1□, Q18°Ql9 are turned off, and the flip-flop 21a is turned off.

When 21b, 21C are in a reset state and the mutual output terminals are at a high level, they are biased by the base bias resistors and the respective transistors Q1□, Q18. Ql is turned on.

Since the collector of the play control transistor Q1□ is connected to the base of the transistor of the play control switch circuit 30, the switch circuit 30 is turned on when the transistor Q1□ is off, and the switch circuit 30 and the power supply terminal B are connected. The play plunger solenoid 12 connected between the switching circuit 30 and the power terminal B is energized.
Brake plunger solenoid 1 connected between
6 is energized.

On the other hand, if the transistor Q1□ is turned on due to the level of the play control transistor Q17 becoming high, the switch circuit 30 is turned off.

The collector of the fast-forward control transistor Q18 is connected to the base of the transistor of the fast-forward control switch circuit 31 via the diode D3, so when this transistor Q18 is off, the switch circuit 31 is turned on, and the switch circuit 31 and The brake plunger solenoid 16 connected to the power terminal B via the diode D2 is energized, and the fast forward motor 32 connected between the switch circuit 31 and the power terminal B is energized. Ru.

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, so that the transistor Q1. is turned off, the switch circuit 33 is turned on, and the relay coil 34 between the switch circuit 33 and the power supply terminal B is energized. S2 is contact a
It can be switched from to contact point.

Also, transistor Q1. Since the collectors of transistors Q1 . switch circuit 3 when is off.
1 turns on, brake plunger solenoid 1
6 and fast forward morph 32 are activated.

Therefore, the relay coil 34 is used only for switching the polarity 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 11 attached to the rotating rod (not shown) rolls into contact with the drum 5 on the right side, resulting in a forward fast forward state, and when it rotates in the other direction. At times, 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, which prevents loading of the cassette, the capstan motor 37 starts rotating, causing the capstan 7 and flywheel 6 in FIG. do.

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, for example, if the power switch 22 is turned on first at time 11 and the loading detection switch 23 is turned on at time 12, the AND output of the two switches transistor Q1 to the state shown in FIG. 3C. As shown, it turns on from point 12.

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

When the transistor Q1 is turned on, its collector becomes a low level 1, so that the transistors Q2 and Q3, to which the collector is connected to the base 1, are turned off.

The collector of the transistor Q2 is connected to the power supply terminal B through the resistor R1, the emitter is grounded, and the collector is connected to the base of the transistor Q8 through the resistor, and to the base of the transistor Q9 through the resistor R3. Since transistor Q2 is turned off in response to transistor Q1 being turned on, transistor Q8 and transistor Q in the next stage are turned on.

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

The collector of NPN l-transistor Q3 is connected to the power supply via resistor R4, and the base is connected to a bias resistor, so it is turned on while transistor Q1 is off, but when transistor Ql is turned on, it is turned on. The base becomes low level and becomes Afu, and the collector becomes high level.

Therefore, the collector of the transistor Q, which is connected to the collector of the transistor Q3 via the diode D, also becomes high level.

A voltage divider circuit consisting of a resistor salt and a resistor 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 through a reverse diode D6. is grounded and connected to the base of transistor Q4 via diode D7, so when transistor Q3 is turned off, the 10B power supply voltage is divided by resistor R41R51R6 and supplied to capacitor C1. A differential pulse is obtained at the output stage of.

When a high level signal with a constant time width is applied to the base of transistor Q4 through a ripple removal circuit consisting of a diode and capacitor C2 and a base circuit consisting of resistors R7 and R8, transistor Q4 is turned on. .

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 R1o.

Also, this emitter is the next stage transistor QQ5'c/)
After being connected in common with the Since it has a Schmitt circuit configuration, when transistor Q4 is turned on, transistor Q5 is turned off.

Since the collector of the transistor Q5 is connected to the power supply line through the base resistor R14, the transistor Q6 is turned on when the transistor Q5 is turned off.

Also, when transistor Q5 is off in response to the differential pulse, its collector is at a high level, so diode D8 connected between its collector and the collector of transistor Q9 is forward biased.

When the transistor Q6 turns on as described above, the first tape slack removal signal is sent from the first 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 between the line 24a and the ground line via a diode D9.
A voltage dividing circuit consisting of a resistor R15 and a resistor R15 is provided.
One end of capacitor C3 is connected to the connection point with 16, the other end of capacitor C3 is connected to the base of transistor Q7 via diode D1o and resistor R17, and there is a connection between the other end of capacitor C3 and the ground line. A diode D11 is connected in the opposite direction, and a ripple removal capacitor C is connected between the cathode of the diode D10 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 from the capacitor C3 is applied to its base, it turns on and its collector goes to the ground level.

In this embodiment, the width of the first differential pulse including capacitor C1 is greater 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
As shown in the third diagram, the transistor Q7 is turned on only for the first period T1, and the transistor Q7 is turned on only for the second period T2, which is shorter than the first period T1, as shown in FIG. 3E.
When transistor Q6 is controlled by SCR,
Almost simultaneously when transistor Q6 turns off, transistor Q7 also turns on.

The first run 24a is the output line of transistor Q6.
is the transistor Q of the brake control circuit 28 shown surrounded by a dotted line.
12 via a resistor R18.

Since the emitter of transistor Q1□ is grounded, it is also turned on during the period when transistor Q6 is on.

A resistor R19 is connected between the emitter of this transistor Q12 and the ground line, and the emitter of the transistor Q1□ is connected to the base of the next stage transistor Q13.
The emitter of the transistor Q13 is grounded, and the brake plunger solenoid 18 and the diode D12 are connected between the collector of the transistor Q13 and the power supply terminal B, so when the previous stage transistor Q1□ is turned on, the subsequent stage transistor Q13 is connected. 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 also connected to the base of a play control transistor Q17 via a diode D13 and a resistor R20.

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 21H, and the play switch circuit 30 is turned off and the play mode is inhibited.

Also, the first line 24a has a diode D14 and a resistor R2.
1 and the base of the rewind control transistor Q19.

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 D15 and a resistor R2□, and is used for controlling the slack detection signal.
This will be discussed in detail later.

The second line 24b is a fast forward control transistor Q18.
connected to the base of.

Therefore, when the transistor Q7 is turned on) and a second tape slack removal signal at ground level is generated on the second line 24b, the fast-forward control transistor Q18 is turned off regardless of the output 1 of the flip-flop 21b. The fast-forward switch circuit 31 is turned on, and the fast-forward motor 3 is turned on.
2 and brake plunger solenoid 16 are energized.

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

The right reel shaft 3 is coupled with a magnetization 38 in which an N pole and an S pole are provided at a predetermined interval, and a Hall element 39 is arranged in the vicinity where the magnet 38 passes. It can be detected by element 39.

That is, the left reel shaft 2 is fixed and the right reel shaft 3 is driven to remove tape slack in a fast forward mode, and while the tape slack is being absorbed, the right reel shaft 3 rotates, so the magnetization 38 also rotates, and the Hall element 39 It is detected 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 sent to the flip-flops 21a, 21b, and 21c. It is configured to

Both ends of the Hall element 39 are connected to the bases of a pair of transistors Q141 and Q15, respectively, forming a differential amplifier.

A pair of transistors Q14. The emitters of Q15 are commonly connected to ground through a resistor R23, and the emitters of transistors Q1. There is a load resistance R between the collector of
24 is connected, and the collector of transistor Q15 is connected to the base of transistor Q16 via capacitor C5. A diode D15 and a resistor R25 are connected between the base of transistor Q16 and the ground line. Since the resistor R26 is connected between the power supply terminal B and the right reel shaft 3 and the magnet 38, the output voltage of the Hall element 39 is changing (during the period when the tape is slack). A signal corresponding to the output of the Hall element 39 that changes AC passes through the capacitor C5, and the base potential of the transistor Q16 changes, causing the transistor Q16 to repeatedly turn 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 C5, and the transistor Q16 is kept in an off state.

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 Q1. is on/
If the capacitor C6 is repeatedly turned off, the charging voltage of the capacitor C6 does not rise to the level at which the Zener diode ZD becomes conductive.

That is. Even if capacitor C6 is charged to some extent while transistor Q16 is off, it is discharged in the circuit consisting of resistor R2□ and transistor Q16 while transistor Q16 is on, and the charging voltage of 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 transistor Q16 and transistor Q16 is held off, capacitor C6 continues to be charged until Zener diode ZD becomes conductive and SCR turns on.

As shown in FIG. 3I <1. When the gate signal of the SCR is applied at the time and the SCR is turned on, the base of the transistor Q6 is connected to the resistor R14, the diode D8, and the transistor Q0.
, becomes low level in the SCR circuit, and the transistor Q61
．． Convert to C 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 of the first tape slack removal signal obtained from the first line 24a and the 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 where the play control transistor Q1□ and the rewind control transistor Q19 are forcibly turned on is released. Ru.

Furthermore, the second line 24b goes to a high level (thus, the fast-forward control transistor Q13 turns on, the switch circuit 31 turns off, and the fast-forward motor 3
2 and the brake plunger solenoid 16 are deenergized, and the tape 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 33 do not start rotating immediately, but rotate after a little delay, so the rotation stops due to this delay and the rotation after tape slack is removed. It is necessary to distinguish between stopping and stopping.

Therefore, the first line 24a is connected to the transistor Q1 via the diode D15, the resistor R2□, and the diode D1□.
A delay capacitor C7 and a resistor R28 are connected between the anode side line of the diode D1□ and the ground line, the emitter of the transistor Q1o is grounded, and the collector is a resistor.

is connected to the power supply terminal B via
is connected in parallel to the series circuit of resistor R2□ and capacitor C6.

As a result, even when the first tape slack removal signal is sent from the first line 24a, the transistor QIO is not turned on immediately, the transistor Q1 is not turned off immediately, and the delay capacitor C7 is connected to the transistor QIO. After being charged to a level where it can be turned on, transistor Q1. is turned on, and transistor Q1 is turned off.

Transistor Q11 is connected to resistor R2 at the same time as the 10B power is turned on.
Since transistor Q1.9 is turned on via Q1. The charging of the capacitor C6 is prevented until the capacitor C6 is turned off at time t3 as shown in FIG. 3H.

Therefore, even if the transistor Q16 is kept on before time t3 and the discharge circuit of the capacitor C6 is cut off by the transistor Q16, the capacitor C6 is not charged, and charging starts after t3.

Therefore, the period t2 to t3 is set to be longer than the start-up time of the tape winding mechanism.

Note that the transistor Q1. Of course, the prevention of transmission due to this will also occur even if there is no slack in the tape from the beginning.

When the first tape slack removal signal on the first line 24a disappears at time 14 in FIG. 3, transistor QIO turns off and transistor Qll 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, either the 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, it is possible to start recording or playback without tape slack, and high-quality recording or playback is possible from the beginning.

Also, during the tape slack removal driving period, the transistor Q17. Since Q19 is controlled by the output of the first line 24a and the play mode and rewind mode are prohibited, there is no switching to another mode during the tape slack removal period.

Therefore, recording or playback can be started after the tape slack is completely removed.

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 the third diagram based on the differentiating circuit of FIG.
Turns on for a period.

Since the T1 period and the T2 period are set to the maximum periods necessary for normal tape slack removal, the tape slack removal drive can be performed regardless of tape slack detection.

Further, since T1>T2, the control by the latch brake mechanism 19 is not released while the fast-forwarding motor 32 is energized to remove tape slack, and the tape does not run unnecessarily.

Further, in this device, the play control transistor Q1□ and the rewind control transistor Q1. responds to the tape slack removal signal, enters the play and rewind inhibiting state, and the fast forward control transistor Q
18 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.

As a result, the true output terminal of the flip-flop 21a becomes low level, but since the resistor R30 is connected, the first
A high level signal on line 24a overcomes this, turning on transistor Q1□ and preventing it from responding to a true output.

Therefore, the play mode is not set 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 Q1□,
Since the f operation is stored, the transistor Q1□ is turned off by the low level output from the true output terminal, and enters the play mode.

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

Also, it is possible to set the mode regardless of whether or not the tape slack removal mode is used.

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.

Furthermore, since the tape slack detection section 25 is provided, if there is no slack in the tape from the beginning or if there is 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 when the tape slack removal mode starts, so that the tape slack is reliably removed. Completion of 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 prevent the transmission of the slack detection output for a certain period of time in precise synchronization with the rise of the tape slack removal mode. .

In addition, the transmission control circuit 36 operates even after tape slack removal is completed, and as a result, the gate signal is applied to the SCR only for a certain period of time, thereby restricting the supply of the gate signal to the SCR more than necessary. has been done.

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 T1 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 period T1 in FIG. 3 depends on the tape winding diameter. It is also possible to change T2 to the highest value.

Further, in the embodiment, the capstan motor 37 is connected after the power switch 22 and the cassette loading detection switch 23 are connected substantially in series, so that the capstan motor 37 does not rotate only when the power is turned on. Although the unstable rotation of the capstan motor 37 is suppressed as much as possible, the capstan motor 37 may be connected elsewhere depending on the case.

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

Further, although the embodiment is configured for a two-motor type tape deck, it can also be applied to a three-motor or one-motor type tape deck or tape recorder.

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

In addition, in the embodiment, tape slack is removed using a fast-forwarding mechanism, but instead of sliding the magnetic head onto the magnetic tape, the pinch roller is brought into contact with the capstan, and the tape slack is removed by driving the capstan. You may go.

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.

Further, the detection of loading of the cassette may be performed not by mechanically closing a microswitch but by other means such as photoelectric or electromagnetic.

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.

In addition, in the embodiment, the transistor Q1□+Ql, p Q
l.

Although the switch circuits 30, 31.33 are configured to be turned on when the switch is off, the switch circuits 30, 31.33 may be configured to be turned on when the switch is on.

Also, the transistors Q1□, Q18. Ql is replaced with a flip-flop, and in response to turning on both the power switch 22 and the load detection switch 23, the flip-flop in place of Ql is set, and the switch circuit 31
may be turned on (instead of Q1□ and Ql9), a reset signal (inhibition signal) may continue to be applied to the flip-flops during tape slack removal.

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 transistor Q17゜Q19.
Instead of connecting the second line 24b to the base of the transistor Q18, a further switch is provided, for example between the flip-flops 21a, 21C and the switch circuit 30.33, and the switch is connected to the first line 24b. 24a
The switch circuits 30 and 33 may be configured to open in response to the first tape slack removal signal of the flip-flops 21a and 21c so that the switch circuits 30 and 33 do not respond to the stored contents of the flip-flops 21a and 21c.

In this case, instead of connecting the second line 24b to the base of the transistor Q18, a set signal is applied to the flip-flop 21b in synchronization with the start of tape slack removal, and a set signal is applied to the flip-flop 21b in synchronization with the completion of tape slack removal. A reset signal may also be provided.

Also, instead of controlling the start and end of the tape slack removal drive using the transistor Q18, a set signal is given to the fast-forward flip-flop 21b in synchronization with the start of the tape slack removal drive, and a reset signal is applied to the other flip-flops 21a and 21C. Alternatively, a reset signal may be applied to the flip-flop 21b in synchronization with the completion of tape slack removal.

In this case, a flip-flop 21a is shown as the operation storage section 21 in the embodiment to be distinguished from the tape traveling mechanism control circuit 27.

21b and 21c also become part of the tape traveling mechanism control circuit.

[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 ~1 point. In the symbols used in the drawings, 1 is a tape running mechanism, 2 and 3 are reel shafts, 4 and 5 are drums, 7 is a capstan, 12 is a play plunger solenoid, 16 is a brake plunger solenoid, and 17 is a A 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, 21
b. 21C is a flip-flop, 22 is a power switch, 23
24 is a tape slack removal signal generation circuit, 25 is a tape slack detection section, 26 is a control circuit, 2T is a tape traveling mechanism control circuit, and 28 is a brake control circuit.

Claims (1)

[Scope of Claims] 1. A tape running mechanism for running the tape of a cassette between a pair of reels, a loading detection switch that detects loading of the cassette into a position where the tape can run, a power switch, and the loading detection switch. a first time width required for tape slack removal or a time width slightly larger than the required time width in response to actuation of both the power switch and the load detection switch; a tape slack removal signal generation circuit that generates a tape slack removal signal and a second tape slack removal signal; and a tape slack removal signal generation circuit electrically coupled to an output of the tape slack removal signal generation circuit and responsive to the first tape slack removal signal. a braking device for applying braking to one reel in the cassette; and a braking device coupled to an output of the tape slack removal signal generating circuit;
In response to the second tape slack removal signal, the other reel in the cassette is driven in the tape winding direction, and in response to the first tape slack removal signal, the tape running mechanism is driven to remove tape slack. A cassette type tape transport device comprising: a tape transport mechanism control circuit configured to prohibit operation in any other mode; 2. The cassette type tape transport device according to claim 1, wherein the first tape slack removal signal has a larger time width than the second tape slack removal signal. 3. The tape running mechanism control circuit includes a play control transistor that sets a play state in response to a play operation, and a fast forward control transistor that sets a fast forward state in response to a fast forward operation, and The play control transistor is configured such that the play control transistor operates in a play inhibiting state in response to the slack removal signal, and the fast forward control transistor operates in a fast forward state in response to the second tape slack removal signal. 3. The cassette type tape transport device according to claim 1, wherein the output of the tape slack removal signal generation circuit is coupled to the fast-forward control transistor.