JPS5849929B2 - 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 a tape transport device such as a cassette type tape deck or tape recorder for running a tape stored in a tape cassette. 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 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 Fumachi Noh.

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, since the tape slack removal mode is configured to be canceled after a certain period of time, there is a drawback that recording or playback cannot be started immediately within a certain period of time even if the tape slack is removed.

Another disadvantage is that even if there is no slack in the tape from the beginning, recording or playback cannot be started until a certain period of time has elapsed.

Furthermore, in the conventional tape slack removal method, the tape slack is removed only when the tape is loaded, so it is not possible to remove the tape slack that occurs between the first tape run and the next tape run.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to be able to remove tape slack after loading the tape, to shorten the period of tape slack removal mode as much as possible, and to prevent malfunctions in tape slack removal. An object of the present invention is to provide a tape transfer device that can prevent IL from continuing for a long time.

To achieve the above object, the present invention includes a tape running mechanism for running the tape of a cassette, a power switch that turns on and off a power supply circuit for driving the tape running mechanism, and a cassette loading detection switch that detects that the cassette is loaded in the active position;
a tape slack detection block for detecting slack in the tape; and a constant necessary to remove maximum tape slack in synchronization with the time when both the power switch and the cassette loading detection switch are activated. generates a tape slack removal signal having a time width, and when a tape slack detection signal is generated from the tape slack detection section, the tape slack removal signal is extinguished without crossing the end of the predetermined time width, and the tape slack removal signal is eliminated; a tape slack removal signal generating circuit configured to eliminate the tape slack removal signal at the end of the certain time width if the detection signal is not generated before the end of the certain time width; A cassette-type tape transport device characterized by comprising a tape transport mechanism control circuit that puts the tape transport mechanism into a tape slack removal driving state in response to a tape slack removal signal obtained from a signal generation circuit. It is.

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

(b) Since the tape slack removal mode is set based on the operation of the power switch and cassette loading detection switch,
The tape slack removal mode can also be set when the power switch is turned on after loading the cassette.

Therefore, even if tape slack occurs between the first tape run and the next tape run, the slack can be removed by turning on the power switch.

(Of) Even if the tape slack detection signal cannot be obtained within a certain time period due to a malfunction of the tape slack detection section, etc., the tape slack removal signal will disappear in synchronization with the end of the certain time period. Therefore, it is possible to prevent the malfunction of tape slack removal from continuing for a long time.

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. is 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 motor, a capsun 7 coupled to the flywheel 6, and a capsun 7 selectively interposed between the flywheel 6 and the take-up rotating drum 5 for rotating 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 fast forwarding and winding motor pulley 9 connected to the motor pulleys 1, 19 by a belt 1o, which rolls into contact with the right drum 5 during fast forwarding and rolls into contact with the left drum 4 during rewinding. A magnetic head 14 is mounted on a head substrate 13 that slides under the force of a return pulley 11 and a play plunger solenoid 12.
The left and right drums 4 and 5 are energized by the pinch roller 15 and the brake plunger solenoid 16 provided together.
The brake mechanism 1γ is configured to be separated from the brake mechanism 1γ.

Further, in connection with the above-mentioned tape traveling mechanism 1, the tape is supplied fjl! in response to the activation of the plunger solenoid 18 for setting the tape slack removal mode. A brake mechanism 19 for setting a tape slack removal mode is provided to brake the drum 4 on the I (left side).

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 record section connected to the operation section 20 and configured to memorize the operations of the operation section 20, and in this embodiment, it is constituted by a flip-flop.

22 is the power switch of the cassette deck, and this throw. Accordingly, various circuits are put into an operating state or an operable state.

Reference numeral 23 denotes a cassette loading detection switch, which is a microswitch provided at a certain position that closes when a cassette is loaded into the tape running machine.

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 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 tape running, that is, the absence of tape slack, by detecting the stoppage of rotation of the take-up reel shaft 3 during the tape slack removal drive.

The transmission control circuit 26 is a circuit that disconnects the tape slack detection unit 25 and the tape slack removal signal generation circuit 24 for a certain period of time from the start of the tape slack drive, and transmits the first signal obtained from the tape slack removal signal generation circuit 24. The cut-off operation is performed only for a certain period of time in response to the tape 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 21 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 causes the tape transport mechanism 1 to operate in the tape slack removal mode. For? This is used.

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. As a result, the tape 1 is brought into pressure contact with the drum 5 on the right side, and the drum 5 on the right side rotates counterclockwise to wind up the slack tape.

At this time, of course, the brake plunger solenoid 16 is also energized, and the braking by the brake mechanism 11 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 a first tape slack removal signal obtained from the tape slack removal signal generation circuit 24. .

Therefore, the slack in the tape is eliminated: i. The plunger solenoid 18 is deenergized and the brake mechanism 19 is in a non-braking state.

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

In this FIG. 2, symbols 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, is the operation capital 2o shown surrounded by a dotted line always open? It consists of a play switch 20a, 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 connected to the set terminal S of each flip-flop 21a, 21b, 21c that constitutes the operation recorder 21.

Since the set terminals S of the respective flip-flops 21a, 21b, 21c are also connected to the positive bias power supply terminal 10B via a resistor, the respective operation switches 20a, 20
When 0b and 20c are turned on and a set signal at the ground level is applied to the set terminal S2, the output state is reversed, indicating that an operation has been performed.

That is, the flip-flops 21a, 21b, 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 reset terminal R of the husband's flip-flops 21a, 21b, 21c via the diode, and the reset signal of the ground level is applied to the reset terminal R of the flip-flops 21a, 21b, 21c.
, 21c are reset, the Q output terminal becomes low level and the G output terminal becomes high level.

The respective flip-flops 2 1 a , 2 1 b ,
The Q output terminal of 2 1 c is coupled to the reset terminal of another flip-flop through an inverter and a diode, so that when any one flip-flop is set, the remaining flip-flops are reset.

The tape running mechanism control circuit 21 shown surrounded by a dotted line includes a play control transistor Q1 provided corresponding to the play operation storage flip-flop 21a, and a fast-forward transistor Q1 provided corresponding to the fast-forward operation storage flip-flop 21b. It has a control 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 p and Q19 are connected to the Q of each flip-flop 21a, 21b, 21c via respective resistors R3o, R31 J R32.
The respective emitters are connected to the output terminals, and the respective emitters are respectively grounded.The respective collectors are connected to respective resistors R33 t R34 ,
They are respectively connected to the positive bias power supply terminal 10B via R35.

Also, is there a difference between each base and the bias power supply terminal 10B? A base resistor is connected between each base and ground.

Therefore, when the flip-flops 21a, 21b, 21c are in the set state and the output terminal is at a low level, the respective transistors Q1, Q+a + Q19 are turned off, and the flip-flops 21a, 21b, 21c are in the reset state. When the voltage terminal is at high level, the base bias resistor biases the respective transistors Q17 and Q.
H3 +Q19 turns on.

Since the collector of the play control transistor Q17 is connected to the base of the transistor of the play control switch circuit 3o, the switch circuit 3o is turned on when the transistor Q17 is off, and the connection between the switch circuit 30 and the power supply terminal 10B is The play plunger solenoid 12 connected therebetween is energized, and the brake plunger solenoid 16 connected between the switch circuit 3o and the power supply terminal 10B is energized.

On the other hand is a play control transistor. When the transistor Q1 is turned on due to the base of the transistor Q1 being at a high level, the switch circuit 3o is turned off.

[Fast-forward] The collector of the transistor Q18 is connected to the base of the transistor of the fast-forward control switch circuit 31 through the diode D3, so when the transistor Q18 is off, the switch circuit 31 is turned on, and the switch circuit 31 is turned on. and the power supply terminal 10B through the diode D2! The key plunger solenoid 16 is energized, and the fast-forward blade motor 32 connected between the switch circuit 31 and the power terminal 10B 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 1, is off, the switch circuit 33 is turned on, and the relay coil 34 between the switch circuit 33 and the power terminal B is energized, causing the switches s1 and s2 to switch from contact a to contact b.
can be switched to

Further, the collector of the transistor Q19 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 forward motor 32 is energized.

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 it rotates in one direction, the pulley 11 attached to the rotation rod (not shown) rolls into contact with the drum 5 on the right side, and enters a fast forward state, and rotates in the other direction. When this happens, 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 31 starts rotating, and the capstan 1 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 becomes active.

That is, as shown in FIG. 3A, for example, the power switch 22 is first turned on at time t1, and the loading detection switch 23 is turned on.
If Q is turned on at time t2, the AND output of both turns on transistor Q1 from time t2 as shown in FIG. 3C.

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, its collector becomes low level, so that transistors Q2 and Q3, whose collectors are connected to their bases, are turned off.

The collector of the transistor Q2 is connected to the power supply terminal 10B through the resistor R1, and grounded to the emitter.The collector is also connected to the base of the transistor Q8 through the resistor R2, and to the base of the transistor Q9 through the resistor R3. Since they are connected, when transistor Q2 turns off in response to turning on transistor Q1, transistor Q8 and transistor Q in the next stage turn 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 295, etc. in the subsequent stage.

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

Therefore, a diode D is connected to the collector of transistor Q3.
The collector of the transistor % connected through 5 also goes high.

A voltage divider circuit consisting of a resistor R5 and a resistor is connected in parallel to the transistor Q3, one end of the capacitor C1 is connected to the connection point between the resistor R5 and the resistor, and the other end of the capacitor c1 is connected to the resistor through a reverse diode D6. and is connected to the transistor Q via the diode D7 and the resistor R7.
4 is connected to the base of resistors R4, R5, R
The voltage is divided by e and supplied to capacitor C1, and a differential pulse is obtained at the output stage of capacitor c1.

When a high level signal with a constant time width is applied to the base of the transistor through a ripple removal circuit consisting of a diode D7 and a capacitor C2 and a base circuit consisting of a resistor and a resistor R8, the transistor Q4 is turned on.

The collector of transistor q is connected to the 10B power supply line via a resistor R, and is also connected to the base of the next stage transistor Q via a resistor Rto.

Further, this emitter is connected in common with the emitter of the next stage transistor Q5 and then grounded via a resistor Rll.
A resistor R1 is connected between the base of the transistor Q5 and the 6th line.
2 is connected, and a resistor R13 is connected between the collector of the transistor Q5 and the power supply line, forming a Schmitt circuit configuration, so that when the transistor Q5 is turned on, the transistor Q is turned off.

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

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 Q is in a forward biased state.

When transistor Q6 turns on as described above, the first line ? The first tape slack removal signal is sent from 4a and is supplied to the tape traveling mechanism control circuit 21 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 dividing circuit consisting of a resistor R15 and a resistor R15 is provided.
One end of the capacitor C3 is connected to the connection point with 16, the other end of the capacitor c3 is connected to the transistor Q7 via the diode D1o and the resistor R1, and there is a connection between the other end of the capacitor c3 and the ground line. A diode Dll is connected in the opposite direction, and a ripple removal capacitor c4 is connected between the cathode of the diode D1o and the ground line.
is connected, and a resistor R1 is connected between the base of transistor Q7 and the ground line.

Note that the NPNI transistor Q7 has an emitter that is grounded, and when a differential pulse obtained by the capacitor c3 is applied to its base, it is turned on and its collector becomes the ground level.

In this embodiment, the width of the first differential pulse obtained from the first differential circuit 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 suppressed 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.

However, when transistor Q6 is controlled by the SCR, transistor Q7 also turns off at substantially the same time as transistor Q6 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.

Since the emitter of transistor Q1 is grounded, it is also turned on while transistor Q6 is on.

A resistor R19 is connected between the emitter of the transistor Q1 and the ground line.

The emitter of the transistor Q13 is connected to the base of the next stage transistor Q13, the emitter of the transistor Q13 is grounded, and a brake plunger nod 18 and a diode D1 are connected between the collector of the transistor Q13 and the power supply terminal 1B.
Is it close? Therefore, when the transistor Q12 at the front stage is turned on, the transistor Q13 at the rear stage is also turned on, and the brake plunger solenoid 18 is energized.

As a result, the brake mechanism 19 is activated as described in FIG. 1, the brake ram 4 is braked, and the reel shaft 2 is fixed.

The first line 24a is also connected to the base of a play suppression transistor Q17 via a diode D13 and a resistor R2o.

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 #JIJ use 1 transistor Q17 becomes active regardless of the output of the flip-flop 21a, and the play The switching circuit 30 is turned off and enters a shutoff mode blocking state.

Also, the first line 24a has a diode D14 and a resistor R2.
It is connected to the base of the rewind control transistor Q19 via.

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, an unwinding mode blocking state is obtained.

The first line 24a is also connected via a diode D15 and a resistor R22 to a transmission control circuit 26 shown enclosed by a dotted line, and is used to control the slack detection signal, which will be described 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 the second tape slack removal signal at the ground level is generated on the second line 24b, the fast-forward control transistor Q18 is turned off regardless of the output of the flip-flop 21b. The switch circuit 31 is turned on, and the fast-forwarding moke 32 and brake plunger solenoid 16 are 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
Is there any slack in the tape caused by the Hall element 39? is detected.

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, the tape end detection circuit 4o is connected, and when the end of the tape is detected, a reset signal is applied to the flip-flops 21a, 21b, 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 forming a differential amplifier.

The emitters of a pair of transistors Q14 and Q15 are connected in common and grounded via a resistor R23, a load resistor R24 is connected between the collector of the transistor Q15 and the power supply terminal 10B, and the collector of the transistor Q15 is connected to a capacitor. C, and the transistor Q. A diode D16 and a resistor R25 are connected between the base of the transistor Q16 and the ground line.A resistor R26 is connected between the collector of the transistor Q16 and the power supply terminal B. During a period in which the output voltage of the Hall element 39 is changing due to the rotation of the right reel shaft 3 and the magnet 38 (a period in which slack is occurring in the tape), a signal corresponding to the output of the Hall element 39 changing in an alternating current manner is generated. Passing through the capacitor c5, the base potentials of the transistors Q and 6 change, causing the transistor Q1a 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.

Further, a Zener diode ZD is connected between the connection point between the capacitor c6 and the resistor R2 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 Q1a is off, the capacitor C
Even if transistor Q.6 is charged to some extent, transistor Q. During the ON period of 6, the circuit consisting of the resistor R2 and the transistor Qta discharges, and the charging voltage of the capacitor c6 does not rise.

? However, when the tape slack is absorbed and there is no change in the output voltage of the Hall element 39, and the transistor Q16 is kept off, the capacitor c6 continues to be charged, and finally the Zener diode ZD becomes conductive and ScR turns on. Become.

As shown in FIG. 3, when the SCR gate signal is applied at time 14 and the SCR is turned on, the base of the transistor Q6 is connected to the resistor R14, the diode D8, the transistor Q,
, becomes low level in the SCR circuit, and the transistor also turns 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 obtained 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 where the play control transistor Q1 and the rewind control transistor Q19 are forcibly turned on is 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 moke 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 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 diode D and the resistor R.
A delay capacitor C7 and a resistor R2 are connected between the anode side line of the diode D17 and the ground line.
The emitter of the transistor Qlo is connected to ground, and the collector is connected to the power supply terminal 10B via the resistor R29, and the base of the transistor Q1o is connected to the transistor Q1o.
It is connected in parallel in a series circuit with 6.

As a result, the first tape slack removal signal is output from the first line 24a. Even when the transistor Qlo is turned on, the transistor Q1 is not turned off immediately, and the delay capacitor C7 is connected to the transistor Q.

After being charged to a level that allows it to turn on, transistor Q1o turns on and transistor Q1 turns off.

Transistor Qll is connected to resistor R2 at the same time as the 10B power is turned on.
Since the transistor Q1o is turned on through 9, the transistor Q1o
The capacitor C6 is controlled to prevent charging of the capacitor C6 until it is turned off at time t3 as shown in FIG. 3H.

Therefore, even if the transistor Q16 does not perform on/off operations before time t3 and is kept off, and the discharge circuit of the capacitor C6 is cut off by the transistor Q1e, the capacitor c6 is not charged, and charging starts after t3. Start.

Therefore, the period t2 to t3 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 Q1o turns off and transistor Q+t 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.

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 threshold 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. Detected completion of slack removal? can be done.

Furthermore, since the transmission suppressing 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. I can do it.

Furthermore, the transmission control circuit 36 operates even after tape slack removal is completed, and the gate signal is applied to SC'H only for a certain period of time. Therefore, the gate signal is not supplied to SCH more than necessary. is restricted.

In addition, in this device, the play control transistor Q1 and the rewind control transistor Q of the output stage of the play flip-flop 21a and the rewind flip-flop 2Jc are
t, responds to the tape slack removal signal and enters the play and rewind inhibiting state, and the fast forward control transistor Q18
operates to get the tape slack removal mode, so
Not only is there no risk of erroneously switching to a mode other than the tape slack removal mode, 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 output terminal of the flip-flop 21a to go to a low level, but since the resistor R3o is connected, the first
A high level signal on line 24H overcomes this, turning on transistor Q17 and preventing it from responding to the Q 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 Q1, the operation is already stored in the flip-flop 21a, so the low level output from the mini output terminal causes the transistor Q17 turns off and enters 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.

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 Based on the differentiating circuit, transistor Q7 is also turned on for a period T1 shown in FIG. 3D, and based on a second differentiating circuit including capacitor C3, transistor Q7 is turned on for a period T2, which is slightly shorter than T1.

Since the T1 period and the T2 period are set to the maximum opening required 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 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 periods T1 and T2 in FIG. 3 may be changed to optimum values depending on the tape winding diameter.

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, and the capstan motor 31 Although unnecessary rotation of the capstan motor 31 is suppressed as much as possible, the capstan motor 31 may be connected to another location depending on the case.

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 configured as 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.
Reel drive? It may be detected by changes in the current of the motor, etc.
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 Vinci roller is brought into rolling contact with the capstan, and the tape slack is removed by the 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.

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

Alternatively, instead of providing an independent brake mechanism 19 for fixing one reel, the normal brake mechanism 1γ 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 Q17 t Qts t
Although the configuration is such that the switch circuits 30, 31.33 are turned on when Q19 is off, the configuration may be such that the switch circuits 30, 3L33 are turned on when Q19 is on.

In addition, the transistors Q1, Q18, and Q19 in the embodiment are replaced with flip-flops, and in response to both the power switch 22 and the loading detection switch 23 being turned on, the flip-flop in place of Q18 is set and the switch circuit 31 is turned on, and Q17 is turned on. Also, a reset signal (inhibition signal) may be continuously applied to the flip-flop in place of Q19 during tape slack removal.

In addition, in the embodiment, one of the reel shafts 2 is fixed to remove tape slack, but it may be driven without fixing it, or both reels may be rotated in opposite directions to remove tape slack. may be removed.

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 the transistors Q1, Q1, and the second line 24b is connected to the bases of the transistors Q1, Q1.
18, a further switch may be provided, for example between the flip-flops 21a, 21C and the switch circuits 30, 33, and the switch may be opened in response to the first tape slack removal signal on the fourth line 24H. The switch circuits 30 and 33 may be configured so as not to respond to the contents stored in 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 1 drive, and another flip-flop 21a, 21c is controlled.
A reset signal may be applied to the flip-flop 21b, and the reset signal may be applied to the flip-flop 21b in synchronization with the completion of tape slack removal.

In this case, for example, the AND output of the power switch 22 and the loading detection switch 23 is differentiated to form a set signal as a tape slack removal signal, and this set signal is applied to the fast-forward flip-flop 21b, so that the tape is After removing the slack, the tape slack removal completion signal obtained from the tape slack detection section 25 is applied as a reset signal to the flip-flop 21b, thereby ending the tape slack removal mode.

In this case, the flip-flops 21a, 21b, and 21c, which are shown in the embodiment as the operation manual unit 21 to be distinguished from the tape traveling mechanism control circuit 21, 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 points A to ■. 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 tape slack removal mode, 19 is a brake mechanism for setting tape slack removal mode, 20 is an operation position, 21 is an operation recording pupil, 21a, 21
b, 21c are flip-flops, 22 is a power switch,
Reference numeral 23 indicates a cassette loading detection switch 24, a tape slack removal signal generation circuit, 25, a tape slack detection section, 26, a transmission control circuit, 21, a south circuit for controlling the tape traveling mechanism, and 28, a braking 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 for turning off; a cassette loading detection switch for detecting that the cassette is loaded in the tape running position; and a tape slack detection section for detecting slack in the tape; the power switch and the cassette loading A tape slack removal signal having a certain time width necessary to remove the maximum tape slack is generated in synchronization with the time when both the detection switch and the detection switch are activated, and the tape slack detection section detects tape slack. When the signal is generated, the tape slack removal signal is extinguished without crossing the end of the certain time width, and if the tape slack detection signal is not generated before the end of the certain time width, the certain time width ends. a tape slack removal signal generation circuit configured to eliminate the tape slack removal signal at a point in time; and a tape slack removal drive for driving the tape transport mechanism in response to a tape slack removal signal obtained from the tape slack removal signal generation circuit. A cassette-type tape transport device, comprising: a tape transport mechanism control circuit for controlling a tape transport mechanism; 2. The cassette type tape transfer device according to claim 1, wherein the tape slack detection section generates a tape slack detection signal in response to stopping tape running.