JP2508599Y2 - Tape drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial field of use B Outline of device C Conventional technology D Problem to be solved by device E Means for solving problem F Action G Example G-1 Configuration and operation (FIGS. 1 to 3) G-2 Control operation of the control unit (Fig. 4) H Effect of the invention A Industrial field of application The present invention relates to a first and a second reel drive which respectively engages a pair of tape reels around which a tape is wound. A first reel driving section driven by the first motor and a second reel driving section driven by the second motor. The present invention relates to a tape drive device that selectively takes a state and a state.

B Outline of the Invention The present invention is provided for the first and second reel driving parts that respectively engage with a pair of tape reels around which tapes are wound, and rotate the first and second reel driving parts respectively. First and second motors to be driven, a state in which the first motor drives the first reel drive section to rotate, and a state in which the second motor rotates the second reel drive section. In a tape drive device provided with an operation control unit configured to selectively take the first and the second motors, one of the first and second motors is supplied with a drive signal and is in an operating state. There is slack in the tape between the pair of tape reels after the operation of one of the first and second motors is started by detecting the generated voltage in the other of the first and second motors. In some cases the tape will lose its slack After the required period has elapsed, the tape between the first reel drive section and the second reel drive section is detected based on the detected power generation voltage of the other of the first and second motors. By discriminating the presence or absence of the tape, the presence or absence of the tape can be surely discriminated without using special optical detecting means or mechanical moving means.

C Prior Art In a magnetic recording / reproducing apparatus that runs a magnetic tape to record information on the magnetic tape or reproduce information from the magnetic tape, the presence or absence of the magnetic tape and the running state of the magnetic tape when the magnetic tape is present are detected. Are required for various motion controls.

In a conventional magnetic recording / reproducing apparatus, for example, in the case where a magnetic tape housed in a tape cassette is used, the tape reel in the tape cassette is engaged when the tape cassette is mounted in the apparatus. A recognition indicator of a specific pattern is provided on a reel drive section that is installed so as to rotate to rotate and drive the tape reel, and the rotation according to the rotation of the reel drive section of the recognition index is composed of a light emitting / receiving element. By being detected by optical reading means,
The running state of the magnetic tape is detected. Further, a detection switch that is turned on or off by the tape cassette itself or a member that moves with the tape cassette when the tape cassette is mounted on the device is provided, and the tape is detected based on the state of the detection switch. The presence / absence of a cassette, and thus the presence / absence of a magnetic tape, is detected.

D Problem to be Solved by the Invention However, in the magnetic recording / reproducing apparatus in which the running state of the magnetic tape or the presence / absence of the magnetic tape is detected as described above, the reel drive unit in the apparatus is used. Is required to be provided with a specific pattern recognition index, and an optical reading means is required to be installed in the vicinity thereof.In addition, a detection switch composed of a micro switch or the like is associated with the tape cassette mounting portion. Since it is required to be provided, therefore, a troublesome mounting work for the optical reading means and the detection switch is added to the assembly process of the apparatus, and the optical reading means or the detection switch is installed inside the apparatus. Providing factors that are disadvantageous for downsizing or thinning the device by increasing the space occupation There is a disadvantage that that. Further, when the recognition index provided on the reel drive unit is stained for detecting the running state of the magnetic tape, the optical reading means cannot properly detect the running state of the magnetic tape. It is also a problem that detection of is likely to be uncertain.

In view of such a point, the present invention provides the first and second reel driving parts provided for the first and second reel driving parts respectively engaged with the pair of tape reels around which the tape is wound. A state in which the first and second motors are configured to be rotationally driven, respectively, and a state in which the first reel driving section of the first motor is rotationally driven and a second reel driving section is rotationally driven by the second motor Provided is a tape drive device capable of reliably discriminating the presence / absence of a tape under the condition that it is selectively turned on and off without using a separate optical detecting means or mechanical moving means. The purpose is to do.

E Means for Solving the Problems To achieve the above-mentioned object, a tape drive device according to the present invention rotationally drives a first reel drive part on which one of a pair of tape reels around which a tape is wound is mounted. A first motor, a second motor that rotationally drives a second reel drive unit to which the other of the pair of tape reels around which the tape is wound is mounted, and one of the first and second motors. The operation control means for supplying a drive signal only to the operating state to bring the operating state, and one of the first and second motors is supplied with the drive signal and is in the operating state. The motor power generation voltage detection means for detecting the power generation voltage in the other one of the first and second motors and the tape between the pair of tape reels after the operation of one of the first and second motors is started. If there is slack, loosen the tape The tape presence / absence determining means for determining the presence / absence of a tape between the first and second reel drive units based on the power generation voltage detected by the motor power generation voltage detection means after the period required for eliminating And are provided and configured.

In the tape drive device according to the present invention having the above-described structure, the pair of tape reels around which the tape is wound are mounted on the first and second reel drive parts, respectively.
When one of the first and second motors is activated by being supplied with a drive signal, thereby causing one of the tape reels to rotate and the tape to move, Also, the other of the second motors is made to be in a power generating state by being rotated in accordance with the other rotation of the tape reel due to the running of the tape, and the generated voltage is detected by the motor generated voltage detecting means. The tape is in the running state when the tape running state detecting means detects that the generated voltage detected by the motor generated voltage detecting means exceeds the preset reference voltage in absolute value. Will be detected.

Also, after one of the first and second motors is activated by being supplied with a drive signal, one of the first and second reel drive sections driven by the drive signal is normally rotated. However, even if a predetermined period set in consideration of the influence of slack of the tape, the generated voltage detected by the motor generated voltage detecting means has an absolute value,
Since it is not detected that the voltage becomes equal to or higher than a preset reference voltage, the tape presence determining means is in a state where the other of the first and second reel drive units is not rotated, that is, a state where there is no tape. Is determined by.

As described above, based on the power generation voltage of the one of the first and second motors that drive the first and second reel drive portions, respectively, which is not activated due to the supply of the drive signal, Since the presence / absence of the tape is determined, the running state of the tape can be reliably detected without using a separate optical detecting means or mechanical moving means.

G Example G-1 Structure and operation (FIGS. 1 to 3) FIG. 1 shows an example of a tape drive device according to the present invention.

In this example, a control unit 11 for controlling the operation of each part is provided, and a resistor 12 and a FWD switch 13 are connected in series between the operating power source + B and the installation potential point. A series connection with 15, a series connection with a resistor 16 and a REW switch 17, a series connection with a resistor 18 and an RF switch 19, and a series connection with a resistor 20 and an STP switch 21 are provided. The signal SP obtained at the connection point between the switch 13 and the signal SF obtained at the connection point between the resistor 14 and the FF switch 15, the signal SR obtained at the connection point between the resistor 16 and the REW switch 17, The signal SQ obtained at the connection point between the resistor 18 and the RF switch 19, and the resistor 20 and the STP switch 21.
The signal ST obtained at the connection point between and is supplied to the control unit 11.

The FWD switch 13 operates in the forward operation mode (hereinafter, FWD
Mode) is turned on when the signal is
It is assumed that SP takes a high level when the FWD switch 13 is in the off state and takes a zero level when the FWD switch 13 is in the on state, and the FF switch 15 uses the fast-forward forward operation mode (hereinafter referred to as the FF mode). When the FF switch 15 is turned on, the signal SF is turned on, and the signal SF takes a high level when the FF switch 15 is turned off and takes a zero level when the FF switch 15 is turned on. Further, the REW switch 17 is turned on when the rewind operation mode (hereinafter referred to as REW mode) is taken, and the signal SR changes to RE.
Take high level when W switch 17 is off, R
When the EW switch 17 is in the ON state, the zero level is set, and the RF switch 19 is set in the ON state when the fast-forward rewind operation mode (hereinafter, referred to as RF mode) is set, and the signal SQ changes to the RF switch 19. Is at a high level when the switch is in an off state, and takes a zero level when the RF switch 19 is in an on state. In addition, STP switch 21
Is turned on when the stop operation mode (hereinafter referred to as STP mode) is taken, and the signal ST changes to the STP switch 21.
STP switch 2 takes a high level when is off
It assumes zero level when 1 is in the on state.

The control unit 11 controls the control signal CP when the FWD switch 13 is turned on and the signal SP takes a zero level.
When the PFF switch 15 is assumed to be in the on state and the signal SF is at the zero level, the control signal CF is set to PREW. When the switch 17 is in the on state and the signal SR is set to the zero level, the control signal CR is set to the PRF switch. When the signal SQ is assumed to be in the ON state and the signal SQ takes the zero level, the control signal CQ is transmitted, and the STP switch 21 is assumed to be in the ON state and the signal S
When T is assumed to have zero level, control signals CP,
Stop sending CF, CR or CQ.

The control signal CP or the control signal CF sent from the control unit 11 is supplied to the motor drive unit 26 through the addition circuit 25, and the motor drive unit 26 outputs the control signal CP or the control signal.
A motor drive signal Dt is formed according to CF and is supplied to the base of the PNP transistor 27. PNP transistor 27
Is supplied with the operating power supply voltage + Bt from the motor drive unit 26 at its emitter, and its winding side motor is at its collector.
It is supposed that one end of 28 is connected. The other end of the winding-side motor 28 is grounded.

On the other hand, the control signal CR or the control signal CQ sent from the control unit 11 is sent to the motor drive unit 30 through the adder circuit 29.
The motor drive unit 30 forms the motor drive signal Ds according to the control signal CR or the control signal CQ, and supplies it to the PN
Supply to the base of P-transistor 31. PNP transistor
In the reference numeral 31, the emitter is supplied with the operating power supply voltage + Bs from the motor drive unit 30, and the collector is connected to one end of the supply side motor 32. The other end of the supply side motor 32 is grounded.

The winding-side motor 28 is provided so as to rotate and drive a winding-side reel drive section to which one of a pair of tape reels around which a tape is wound is mounted, and the supply-side motor 32 is used for winding the tape. It is provided to rotationally drive the supply-side reel drive unit to which the other of the pair of mounted tape reels is mounted. Then, under the FWD mode or FF mode, the tape runs from the tape reel equipped with the supply-side reel drive section to the tape reel installed in the take-up-side reel drive section, and also in the REW mode. Alternatively, under the RF mode, the tape reel mounted on the take-up reel drive section travels from the tape reel mounted on the supply reel drive section to the STP mode. Is stopped.

When the motor drive signal Dt from the motor drive unit 26 is supplied to the base of the PNP transistor 27, the PNP transistor 27
Is in a state in which a drive current corresponding to the motor drive signal Dt is supplied to the winding-side motor 28, whereby the winding-side motor 28 is in an operating state. Then, the voltage obtained at one end of the winding-side motor 28 is supplied to the comparison input end of the level comparison unit 37 through the integration circuit formed by the resistor 35 and the capacitor 36, and is supplied to the reference input end of the level comparison unit 37. Is supplied with a negative comparison reference voltage −Vr from the reference voltage source 38. The comparison output obtained at the output terminal of the level comparison unit 37 is supplied to the base of the PNP transistor 39. PNP transistor 39
Has its emitter connected to the operating power supply + B ', and the signal St available at its collector is supplied to the control unit 11.

Similarly, when the motor drive signal Ds from the motor drive unit 30 is PN
When supplied to the base of the P-transistor 31, the PNP transistor 31 is in a state of supplying a drive current according to the motor drive signal Ds to the supply-side motor 32.
32 is activated. Then, the voltage obtained at one end of the supply-side motor 32 is supplied to the comparison input end of the level comparison unit 43 through the integration circuit formed by the resistor 40 and the capacitor 42, and the reference input end of the level comparison unit 43 A negative comparison reference voltage −Vr from the reference voltage source 44 is supplied. The comparison output obtained at the output terminal of the level comparison unit 43 is PN
It is supplied to the base of the P-transistor 45. The PNP transistor 45 has its emitter connected to the operating power supply + B ′, and the signal Ss obtained at its collector is supplied to the control unit 11.

Under these conditions, when the FWD switch 13 is turned on and the FWD mode is set, or the FF switch 15
When the FF mode is set to the ON state, the motor drive unit 26 supplies the motor drive signal Dt corresponding to the control signal CP or CF from the control unit 11 to the base of the PNP transistor 27, A drive current corresponding to the motor drive signal Dt is supplied to the winding side motor 28 through the PNP transistor 27. As a result, the winding-side motor 28 is brought into an operating state and rotationally drives the winding-side reel drive section at a speed required for the FWD mode or the FF mode.

In such a case, the resistance obtained at one end of the winding-side motor 28 is
As shown in FIG. 2A, the voltage Vt taken through the integrating circuit formed by 35 and the capacitor 36 has a zero level before the time t1 when the operation of the winding side motor 28 is started, After a time point t1, it becomes a predetermined positive level. Therefore, under such circumstances, a high-level comparison output is obtained from the level comparison unit 37, and the PNP transistor 39
Is maintained in the off state and the signal St is maintained at the zero level as shown in FIG. 2B.

At this time, when a pair of tape reels on which the tape is wound is mounted on the take-up reel drive unit and the supply-side reel drive unit, respectively, the tape is made to run by the rotation of the take-up reel drive unit. It is said that The supply-side reel drive section is rotated as the tape runs, and the supply-side motor 32 is further rotated as the supply-side reel drive section is rotated.
Is rotated. Thereby, the supply side motor 32 is
The power generation state is such that a negative voltage is generated. At this time, the voltage Vs obtained at one end of the supply side motor 32 and passed through the integrating circuit formed by the resistor 40 and the capacitor 42 is 2 As shown in FIG. 2C, the winding side motor
Before the time point t1 when the operation of 28 is started, it takes a zero level, and after the time point t1, it decreases from the zero level to the negative level side, and at a time point t2 which is slightly later than the time point t1, it becomes a negative reference voltage −Vr. After reaching the predetermined negative level after reaching the predetermined negative level, the negative level is maintained. Therefore, under such circumstances, the comparison output obtained from the level comparison unit 43 is the time t2 at which the voltage Vs reaches the negative comparison reference voltage −Vr.
Previously it was high, but after time t2 it was low, which caused PNP transistor 45
Is turned off before time t2, but
It is turned on after t2. As a result, the signal Ss has a zero level before the time t2 and a predetermined positive level after the time t2, as shown in FIG. 2D.

In such a case, the control unit 11 detects the level of the signal Ss supplied from the collector of the PNP transistor 45 and outputs the signal Ss.
The running state of the tape from the tape reel mounted on the supply reel drive unit to the tape reel mounted on the take-up reel drive unit is detected based on that Ss takes a predetermined positive level after time t2. .

After that, for example, when the tape delivered from the tape reel mounted on the supply-side reel drive unit reaches the terminal end, the rotation of the supply-side reel drive unit is stopped, and accordingly, the operation of the supply-side motor 32 is stopped. Stopped,
The supply side motor 32 does not take a power generation state. As a result, the voltage Vs rises from the predetermined negative level to the zero level side after the time t3 when the operation of the supply-side motor 32 is stopped, as shown in FIG. 2C, and slightly later than the time t3. At time t4, the negative comparison reference voltage −Vr is reached, then further rises to reach the zero level, and then the zero level is maintained. Therefore, the signal Ss changes from the predetermined positive level to the zero level at the time point t4, as shown in FIG. 2D.

Then, when the control unit 11 detects the change of the signal Ss from the predetermined positive level to the zero level at the time point t4, it stops the sending of the control signal CP or CF and takes the stop operation. As a result, the winding-side motor 28 through the PNP transistor 27
Drive current is no longer supplied to the
28 operation is stopped. As a result, as shown in FIG. 2A, after the time t4, the voltage Vt changes from the predetermined positive level to the zero level.

If the STP switch 21 is turned on and the STP mode is set before the tape delivered from the tape reel attached to the supply-side reel drive unit reaches the end portion,
The control unit 11 stops the sending of the control signal CP or CF and takes a stop operation. As a result, the PNP transistor 27
The drive current is not supplied to the winding-side motor 28 through the, and the operation of the winding-side motor 28 is stopped.
As a result, the voltage Vt changes from the predetermined positive level to the zero level, and the voltage Vs rises from the predetermined negative level to the zero level to maintain the zero level.
Ss returns from the predetermined high level to the zero level when the voltage Vs reaches the negative reference voltage −Vr.

On the other hand, when the tape is not wound around the take-up reel drive section and the supply-side reel drive section, the take-up motor 28 is operated to rotate the take-up reel drive section. However, the supply side reel drive unit cannot be rotated,
Therefore, the supply-side motor 32 is also unable to rotate, and cannot enter the power generation state. As a result, the voltage Vs is maintained at the zero level and the signal Ss is also maintained at the zero level.

Even in such a case, the control unit 11 operates the PNP transistor 4
Detect the level of the signal Ss supplied from the collector of 5,
The absence of a tape is detected between the supply reel drive section and the take-up reel drive section based on the fact that the signal Ss is maintained at the zero level without taking a predetermined positive level.

Incidentally. In this case, if there is slack in the tape between the tape reels respectively attached to the take-up reel drive section and the supply-side reel drive section, the tape is wound around the take-up reel drive section and the supply-side reel drive section. Even if the take-up side motor 28 is operated under the condition that the pair of tape reels are respectively mounted, the slack of the tape is only eliminated for a short period after the start of the operation, and the supply side reel drive section. Therefore, the control unit 11 determines the level of the signal Ss for detecting that there is no tape between the supply-side reel drive section and the take-up reel drive section. It is performed after a lapse of a predetermined period (Tx), which is set to be a short period or more required to eliminate the slack of the tape after the operation of the winding-side motor 28 is started.

When the REW switch 17 is turned on and the REW mode is taken, or when the RF switch 19 is turned on and the RF mode is taken, the motor drive unit
The motor drive signal Ds corresponding to the control signal CR or CQ from the control unit 11 is supplied from 30 to the base of the PNP transistor 31, and the supply side motor 3 is supplied through the PNP transistor 31.
A drive current corresponding to the motor drive signal Ds is supplied to 2.
As a result, the supply-side motor 32 is activated and the REW
The supply-side reel drive unit is rotationally driven at the speed required for the mode or the RF mode.

In such a case, the resistance is obtained at one end of the supply side motor 32.
As shown in FIG. 3C, the voltage Vs taken through the integrating circuit formed by the capacitor 40 and the capacitor 42 has a zero level before the time t5 when the operation of the supply side motor 32 is started, and It takes a predetermined positive level after t5. Therefore, under such circumstances, the high-level comparison output is obtained from the level comparison unit 43, and the PNP transistor 45
Is maintained off and the signal Ss is maintained at zero level as shown in FIG. 3D.

At this time, when a pair of tape reels around which the tape is wound is mounted on the supply-side reel drive unit and the take-up-side reel drive unit, respectively, the tape is made to run by the rotation of the supply-side reel drive unit. To be done. The winding-side reel drive section is rotated as the tape runs, and the winding-side motor 28 is rotated as the winding-side reel drive section is rotated.
Is rotated. As a result, the winding-side motor 28 is
It is in a power generation state that generates a negative voltage, and at this time, the voltage Vt obtained at one end of the winding side motor 28 and passed through the integrating circuit formed by the resistor 35 and the capacitor 36 is As shown in FIG. 3A, the supply side motor
Before the time t5 when the operation of 32 starts, it takes a zero level, and after the time t5, it decreases from the zero level to the negative level side, and at a time t6 slightly later than the time t5, the negative reference voltage −Vr After reaching the predetermined negative level after reaching the predetermined negative level, the negative level is maintained. Therefore, under such circumstances, the comparison output obtained from the level comparison unit 37 is the time t6 when the voltage Vt reaches the negative comparison reference voltage −Vr.
Previously it was high, but after time t6 it was low, which caused the PNP transistor 39
Is turned off before time t6, but
It is turned on after t6. As a result, the signal St has a zero level before the time point t6 and has a predetermined positive level at the time point t6, as shown in FIG. 3B.

At this time, the control unit 11 detects the level of the signal St supplied from the collector of the PNP transistor 39,
The traveling state of the tape from the tape reel mounted on the supply reel drive section to the tape reel mounted on the take-up reel drive section is detected based on that St takes a predetermined positive level after time t6. .

After that, for example, when the tape delivered from the tape reel mounted on the take-up reel drive unit reaches the end portion, the rotation of the take-up reel drive unit is stopped, and accordingly, the take-up motor 28 Is stopped,
The winding-side motor 28 is not in a power generation state. As a result, as shown in FIG. 3A, the voltage Vt rises from the predetermined negative level to the zero level side after the time t7 when the operation of the winding-side motor 28 is stopped, and slightly after the time t7. At the late time point t8, the negative comparison reference voltage −Vr is reached, then further rises to reach the zero level, and then the zero level is maintained. Therefore, the signal St changes from the predetermined positive level to the zero level at the time point t8.

Then, when the control unit 11 detects the change of the signal St from the predetermined positive level to the zero level at the time point t8, it stops the transmission of the control signal CR or CQ and performs the stop operation. As a result, the supply side motor 32 through the PNP transistor 31
Drive current is no longer supplied to the supply side motor
32 is deactivated. As a result, as shown in FIG. 3C, after the time t8, the voltage Vs changes from the predetermined positive level to the zero level.

If the STP switch 21 is turned on and the STP mode is set before the tape delivered from the tape reel attached to the take-up reel drive unit reaches the end portion,
The control unit 11 stops the sending of the control signal CR or CQ and takes a stop operation. Thereby, the PNP transistor 31
The drive current is no longer supplied to the supply-side motor 32 through this, and the operation of the supply-side motor 32 is stopped.
As a result, the voltage Vs changes from the predetermined positive level to the zero level, and the voltage Vt rises from the predetermined negative level to the zero level to maintain the zero level.
St returns from a predetermined high level to zero level when the voltage Vt reaches the negative comparison reference voltage −Vt.

On the other hand, when a pair of tape reels around which the tape is wound is not mounted on the supply-side reel drive section and the take-up-side reel drive section, the supply-side motor 32 is operated to drive the supply-side reel drive. Even if the drive section is driven to rotate, the take-up reel drive section cannot be rotated.
28 will not be able to rotate and will not be in a power generation state. As a result, the voltage Vt is maintained at zero level and the signal
St is also maintained at zero level.

Even in such a case, the control unit 11 uses the PNP transistor 3
The level of the signal St supplied from the collector of 9 is detected,
The absence of a tape is detected between the take-up reel drive section and the supply reel drive section based on the fact that the signal St is maintained at the zero level without taking a predetermined positive level.

Also in this case, if there is slack in the tape between the tape reels mounted on the supply-side reel drive unit and the take-up reel drive unit, respectively, the tape will be removed from the supply-side reel drive unit and the take-up reel drive unit. Even if the supply side motor 32 is operated under the condition that the pair of wound tape reels are respectively mounted, the tape is not loosened in a short period after the operation is started, and the winding Since the side reel drive unit is in a state where it cannot be rotated, the control unit 11
In, the determination of the level of the signal St for detecting the absence of the tape between the take-up reel drive unit and the supply-side reel drive unit, after the operation of the supply-side motor 32 is started,
It is performed after a lapse of a predetermined period (Tx) set so as to be equal to or longer than a short period required for eliminating the slack of the tape.

G-2 Control Operation of Control Unit (FIG. 4) The control unit 11 for controlling the tape driving operation as described above is configured by using, for example, a microcomputer, and the microcomputer performs the tape driving operation. An example of a program executed to control the above will be described with reference to the flowchart of FIG.

In the program shown by the flowchart of FIG. 4, after the start, in step 50, it is determined based on the signal SP whether or not the FWD switch 13 is turned on and the FWD mode is set. As a result, if the FWD mode is set, the control signal CP is transmitted in step 51, and the process proceeds to step 52. If the result of determination in step 50 is that the FWD mode is not set, step 5
At 3, it is determined based on the signal SF whether the FF switch 15 is turned on and the FF mode is set. As a result, if the FF mode is set, the control signal CF is transmitted in step 54 and the process proceeds to step 52.

In step 52, based on the signal ST, it is determined whether the STP switch 21 is turned on and the STP mode is set. As a result, if the STP mode is not set, in step 55, it is determined whether or not the signal Ss from the collector of the PNP transistor 45 has a predetermined positive level. Then, when the signal Ss is not set to take a predetermined positive level, further, in step 56, after the operation of the winding side motor 28 is started,
If there is slack in the tape between the tape reels respectively mounted on the supply-side reel drive section and the take-up-side reel drive section, it is set so as to be longer than the short period required to eliminate the slack in the tape. It is determined whether the period Tx of has passed. As a result, when the predetermined period Tx has elapsed, in step 57, the sending of the control signal CP or CF is stopped to perform the stop operation, and then the process returns to step 50.

Further, as a result of the determination in step 55, if the signal Ss is assumed to have a predetermined positive level, or if the result of the determination in step 56 is that the predetermined period Tx has not elapsed, then step 50 is performed. Return.

Further, as a result of the determination in step 52, when the STP mode is set, the process directly proceeds to step 57, the sending of the control signal CP or CF is stopped in step 57 to perform the stop operation, and then to step 50. Return.

On the other hand, as a result of the determination in step 53, when the FF mode is not set, it is determined in step 58 whether or not the REW switch 17 is turned on and the REW mode is set based on the signal SR. . As a result, if the REW mode is set, the control signal CR is transmitted in step 59 and the process proceeds to step 62. If the result of determination in step 58 is that the REW mode has not been taken, step 60
At, it is determined whether the RF switch 19 is turned on and the RF mode is set, based on the signal SQ. As a result, if the RF mode is set, the control signal CQ is transmitted in step 61 and the process proceeds to step 62.

In step 62, it is determined based on the signal ST whether the STP switch 21 is turned on and the STP mode is set. As a result, if the STP mode is not set, in step 63, it is determined whether or not the signal St from the collector of the PNP transistor 39 has a predetermined positive level. If the signal St is not assumed to have a predetermined positive level, then the step
At 64, after the operation of the supply-side motor 32 is started, the slack of the tape is eliminated when there is slack in the tape between the tape reels respectively mounted on the winding-side reel drive section and the supply-side reel drive section. It is determined whether or not a predetermined period Tx, which is set to be a required short period or more, has elapsed. As a result, when the predetermined period Tx has elapsed, the process proceeds to step 57.

Further, as a result of the determination in step 63, if the signal St is assumed to have a predetermined positive level, or if the result of the determination in step 64 is that the predetermined period Tx has not elapsed, the process proceeds to step 50. Returning, as a result of the determination in step 62, when the STP mode is set, the process directly proceeds to step 57.

Furthermore, as a result of the determination in step 60, when the RF mode is not set, the process returns to step 50.

H Effect of the Invention As is apparent from the above description, according to the tape driving device of the present invention, the first reel driving unit for rotating one of the pair of tape reels around which the tape is wound is rotationally driven. A first motor and a second motor that rotationally drives a second reel drive unit to which the other of the pair of tape reels around which the tape is wound is mounted.
It is necessary to eliminate the slack in the tape when one of the motors is activated by supplying a drive signal to the motor, and after the start of the operation, if there is slack in the tape between the pair of tape reels. After the period has elapsed, the power generation voltage from the other of the first and second motors is detected, and the presence / absence of a tape is determined based on the detected power generation voltage. The optical detection means, the mechanically movable means, etc. are not used, and the judgment is surely made. Then, for example, when it is determined that there is no tape, the one of the first and second motors that is in the operating state is put into the stopped state, and the power consumption increases unnecessarily. The situation to do is avoided.

[Brief description of drawings]

1 is a block diagram showing an example of a tape drive device according to the present invention, FIGS. 2A to 2D and 3A to 3D are waveform diagrams used for explaining the operation of the example shown in FIG. FIG. 4 is a flowchart showing an example of a program executed by the control unit used in the example shown in FIG. 1 to perform a control operation. In the figure, 11 is a control unit, 13 is an FWD switch, 15 is an FF switch, 17 is a REW switch, 19 is an RF switch, 21 is an STP switch, 26 and 30 are motor drive parts, 27, 31, 39 and 45 are PN.
A P-transistor, 28 is a winding-side motor, 32 is a supply-side motor, and 37 and 43 are level comparison units.

Claims (1)

(57) [Scope of utility model registration request] 1. A first motor for rotationally driving a first reel drive unit to which one of a pair of tape reels around which a tape is wound is mounted, and the other of the pair of tape reels around which the above tape is wound. A second motor for rotationally driving a second reel drive section to which is mounted; and operation control means for supplying a drive signal to only one of the first and second motors to bring it into an operating state. One of the first and second motors is activated by being supplied with the drive signal, and the first and second motors are activated.
After the start of the operation of one of the first and second motors and the motor power generation voltage detection means for detecting the power generation voltage of the other of the motors, the tape is not loosened between the pair of tape reels. In some cases, the first reel drive section and the second reel are driven based on the power generation voltage detected by the motor power generation voltage detection means after the period required for eliminating the slack of the tape has passed. A tape drive device comprising: a tape presence / absence determining unit that determines the presence / absence of a tape between the drive unit and the drive unit.