JPH04366456A - Tape driving device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape drive device used in a magnetic recording/reproducing device.

0002

2. Description of the Related Art An example of a tape drive device used in a conventional magnetic recording/reproducing apparatus (hereinafter referred to as a VTR) is shown in Japanese Patent Laid-Open No. 60-283394. FIG. 8 is a block diagram showing an example of a conventional tape drive device. This tape drive device includes a first tape drive unit that transports the tape at a high tape speed in a fast forward mode or a rewind mode, and a second tape drive unit that transports the tape at a slow tape speed in a playback mode or the like. have.

In the playback or fast forward mode, the tape 3 is transferred from the tape supply reel 2 to the tape take-up reel 1 in the direction of arrow A. The take-up reel pulse generator 4 generates a pulse signal as the tape take-up reel 1 rotates.
The supply reel pulse generator 5 generates a pulse signal as the supply reel 2 rotates. Tape speed detector 6
The tape speed is detected by calculating the pulse signals of the take-up reel pulse generator 4 and the supply reel pulse generator 5. The tape speed reference information generator 7 stores a plurality of types of tape speed reference values (TC1 to TCn), and supplies these reference values to the speed error calculator 8. The speed error calculator 8 calculates the error between the tape speed information output by the tape speed detector 6 and the reference information of the tape speed reference information generator 7, and sends its output to the take-up reel motor drive circuit 9. give to The take-up reel motor drive circuit 9 is
A control signal is sent to the reel motor 1 so as to drive the tape take-up reel 1 with a torque corresponding to the output value of the speed error calculator 8.
Give to 0. The first tape drive means 11 configured as described above includes a tape take-up reel 1 and a tape supply reel 2.
It functions to control the transfer of the tape 3 between the tape 3 and the tape 3.

[0004] Next, the timer 12 is used to set a transitional time period after the operation of the first tape drive means 11 is completed until transition to the reproduction mode. The output of the timer 12 is given to a pinch roller drive circuit 13, and when the output of the timer 12 is reversed, the pinch roller drive circuit 13 presses the pinch roller 14 against the capstan 15 side via the tape 3. The capstan 15 is controlled to rotate at a constant speed by a capstan motor drive circuit 16 and a motor (not shown). The tape 3 pressed by the pinch roller 14 and the capstan 15 is transferred at a constant speed to the tape take-up reel 1 via a rotating head (not shown). The second tape drive means 17 having such a structure functions to control the transport of the tape 3 using the capstan 15 and the pinch roller 14 when the VTR is in the playback mode.

Now, the operations of the first and second tape drive means will be explained. When a tape is transferred in a VTR playback mode or the like, the second tape drive means 17 is turned on, and the pinch roller 14 pinches the tape 3 between the capstans 15 and transfers the tape at a specified speed. Conversely, when the second tape drive means 17 is turned off due to the temporary stop mode of the VTR, the pinch roller 14 separates from the capstan 15 and does not come into contact with the tape. Second tape drive means 17
When the tape 3 is transferred, the rotation speed of the capstan 15 is controlled to be constant, and the relative speed between the tape 3 and a rotating head (not shown) is kept constant.

In the fast forward mode of the VTR, if it is attempted to increase the tape transport speed by using the second tape drive means 17, it is necessary to increase the rotational speed of the capstan 15. In this case, the capstan 15 is not normally rotated at a high speed because it causes major problems with the bearing structure of the capstan motor, the voltage supplied to the capstan motor, and the like. Therefore, the second tape drive means 17
The first tape drive means 11 is in charge of relatively slow tape speed modes (VTR recording and reproducing modes), and the first tape drive means 11 is in charge of fast tape speed modes (VTR fast forward and rewind modes).

[0007] Next, the operation when the VTR shifts from fast forward mode to playback mode will be explained. In this case, when the first tape drive means 11 is switched to the second tape drive means 17 and the tape 3 moves from a high-speed transfer state to a low-speed transfer state, a process as shown in FIG. 9 is performed. This figure is a time chart showing the transport speed of the tape 3 and the on/off states of the timer 12 and the pinch roller 14. At time t0, the first tape drive means 11 issues an instruction to change from the fast forward mode to the playback mode. When this is done, the speed of the tape 3 is reduced as shown in FIG. 9(a). This deceleration processing is performed by sequentially switching the reference information of the tape speed reference information generator 7 in FIG.

At time t1, the timer 12 is activated from the time when the tape speed instructed by the tape speed reference information generator 7 becomes zero. As shown in FIG. 9(b), at time t2 when the preset time of the timer 12 has elapsed, a switching signal is sent from the timer 12 to the pinch roller drive circuit 13 as shown in FIG. 9(c), and the pinch roller 14 is activated. It is activated, and the tape 3 is transferred by switching to the second tape drive means 17. If the pinch roller 14 is started while the tape 3 is being transferred at high speed, the tape is likely to be damaged, so instead of starting the pinch roller 14 immediately at time t1, the pinch roller 14 is started after a certain period of time at time t2. .

[0009]

[Problems to be Solved by the Invention] However, in such a conventional configuration, the tape drive means 11 to the second
When switching to the tape drive means 17, it was necessary to provide a certain idle time from time t1 to time t2, as shown in FIG. In particular, the winding diameter of the tape changes significantly depending on the position of the tape. Therefore, the inertia of the tape supply and take-up reels, including tape 3, and the running load of the tape are not uniform, and it is necessary to set the idle time taking into account the worst case conditions. It was a big obstacle. Recently, tapes have tended to become thinner and more susceptible to tape damage, so it has been difficult to shorten this idle time.

SUMMARY OF THE INVENTION The present invention is intended to solve these conventional problems, and it is an object of the present invention to provide a tape drive device that can switch the tape transport speed at high speed.

[0011]

[Means for Solving the Problems] The invention according to claim 1 provides a supply reel pulse generator that generates a pulse signal as a tape supply reel rotates, and a supply reel pulse generator that generates a pulse signal as a tape take-up reel rotates. a take-up reel pulse generator, a first tape drive means for controlling high-speed tape transfer between a tape supply reel and a tape take-up reel, and a first tape drive means for controlling constant-speed tape transfer using a capstan and a pinch roller. 2 tape drive means, the first tape drive means having a first frequency-to-voltage converter that converts the frequency of the pulse of the take-up reel pulse generator into a voltage signal; a second frequency-to-voltage converter converting the frequency of the pulses of the supply reel pulse generator into a voltage signal; and summing the output of the first frequency-to-voltage converter and the output of the second frequency-to-voltage converter. an adder, a reference information generator that holds reference information of the tape speed immediately before tape transport is stopped, and switching to the second tape drive means when the output of the adder becomes smaller than the output value of the reference information generator. a comparator for providing a signal from the first tape drive means to the second tape drive means;
The present invention is characterized in that switching to the tape drive means is performed by a switching signal from a comparator.

The invention according to claim 2 of the present invention provides a supply reel pulse generator that generates a pulse signal as a tape supply reel rotates, and a take-up reel pulse generator that generates a pulse signal as a tape take-up reel rotates. a first tape drive means for controlling tape transfer between a generator, a tape supply reel and a tape take-up reel; a second tape drive means for controlling tape transfer using a capstan and a pinch roller;
The first tape drive means includes a take-up reel rotation direction detector that detects the rotation direction of the tape take-up reel, and a take-up reel motor drive circuit that drives the tape take-up reel. , a tape speed detection section that detects the tape transport speed based on the pulse signal of the take-up reel pulse generator and the pulse signal of the supply reel pulse generator;
A tape speed reference information generation section that instructs the tape transport speed; a speed error calculation section that calculates the error between the output of the tape speed detection section and the output of the tape speed reference information generation section; The present invention is characterized by comprising a switching processing unit that switches tape transport to the second tape transport means when the output of the rotation direction detector is reversed.

[0013] The invention according to claim 3 of the present invention is based on claim 2.
When the switching processing unit described above switches from a state where the tape is transported by the first tape drive means to a state where the tape is transported by the second tape drive means, the rotation of the take-up reel is determined based on the output of the take-up reel rotation direction detector. The present invention is characterized in that a control signal is applied to the take-up reel motor drive circuit to increase or decrease the torque of the take-up reel drive motor depending on the direction.

[0014] The invention according to claim 4 of the present invention is based on claim 2.
Alternatively, the first tape drive means according to item 3 causes the tape drive means to transfer the tape to the second tape drive means when a preset time has elapsed after the tape speed reference information generating section issues an instruction to stop tape transfer. The device is characterized in that it includes a timer section for switching.

[0015]

[Operation] According to the invention of claim 1 of the present application having such features, the supply reel pulse generator generates the rotation pulse signal of the tape supply reel and the take-up reel pulse generator generates the rotation pulse signal of the take-up reel. The tape speed is detected by the generator signal and the take-up reel is released from fast forward mode. These pulses are applied to first and second frequency-voltage converters to generate voltage signals, and the rotational speed signals of the take-up reel and the supply reel are added together. In this way, a voltage signal corresponding to the transport speed can be obtained even before the tape is about to stop. Then, after the tape transport speed approaches the state immediately before stopping, if the output of this transport speed becomes smaller than the reference information of the reference information generator,
Switching from the first tape drive means to the second tape drive means. At this time, by turning on the pinch roller,
The tape is being switched from fast forward mode to playback mode.

According to the inventions of claims 2, 3 and 4 of the present application,
The tape speed is detected by the rotation pulse signals of the tape supply reel and take-up reel, and the error with the signal from the tape speed reference information generation section is calculated by the speed error calculation section. When switching the tape from fast-forward mode to playback mode, the tape speed reference information is sequentially lowered to bring the tape transport speed closer to the state immediately before stopping. When the tape speed reference information generation section outputs a tape stop signal, the second tape drive means is turned on immediately when a reversal signal is obtained from the supply reel rotation direction detector, and the mode is switched to the reproduction mode. Further, when the set time held by the timer section elapses after outputting the tape stop signal, the device switches to the second tape drive means.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a tape drive device in a first embodiment of the present invention. Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations are omitted. Tape take-up reel (hereinafter referred to as take-up reel) 1 and tape supply reel (hereinafter referred to as supply reel) 2
A tape 3 is stretched between them. The take-up reel pulse generator 4 generates a two-phase pulse signal as the take-up reel 1 rotates, and the supply reel pulse generator 5 also generates a similar pulse signal as the supply reel 2 rotates. be. These two sets of pulse signals are applied to a tape speed detector 6. As will be described later, the tape speed detector 6 adds the square values of the pulse periods of the take-up reel pulse generator 4 and the supply reel pulse generator 5 and converts the sum into a tape speed. The tape speed reference information generator 7 stores a plurality of types of tape speed reference values TCn to TC0 (including stop signals), and outputs one of the reference signals to one of the input terminals of the speed error calculator 8. give to Speed error calculator 8
outputs the difference between the output of the tape speed detector 6 and the output of the tape speed reference information generator 7, and the take-up reel motor drive circuit 9 generates a torque according to the output value of the speed error calculator 8. It drives the reel motor 10.

In this embodiment, the pulse signal from the take-up reel pulse generator 4 is applied to a first frequency-voltage converter 21 (hereinafter referred to as F/V converter 21). F/
The V converter 21 converts the voltage signal into a voltage signal proportional to the rotational speed of the take-up reel 1. The second F/V converter 22 similarly converts the pulse signal from the supply reel pulse generator 5 into a voltage signal proportional to the rotational speed of the supply reel 2, and provides its output to the adder 23. Adder 23
is for adding the respective outputs of the F/V converters 21 and 22, and supplies the output to the comparator 25. The reference information generator 24 holds reference information Refs, and the comparator 25
give to This reference output Refs is a reference signal having a value equivalent to the low speed signal immediately before the tape 3 stops. Comparator 2
5 compares the output of the adder 23 with the output of the reference information generator 24.

In this embodiment, the first tape drive means 26 includes a take-up reel pulse generator 4, a supply reel pulse generator 5, a tape speed detector 6, a tape speed reference information generator 7, and a speed error detector. Detector 8, take-up reel motor drive circuit 9, reel motor 10, F/V converter 21, F/
It is composed of a V converter 22, an adder 23, a reference information generator 24, and a comparator 25. Also, the second tape drive means 17
is composed of a pinch roller drive circuit 13, a pinch roller 14, a capstan 15, and a capstan motor drive circuit 16, as in the conventional example.

Next, the operation of the first embodiment will be explained using a time chart. FIG. 2 is a time chart showing the waveforms of the main parts of FIG. When the VTR is in the fast forward mode, the tape speed reference information generator 7 outputs a speed signal TCn higher than the tape transport speed during the playback mode. The speed error calculator 8 compares this speed signal TCn with the actual tape speed v obtained from the tape speed detector 6, and controls the reel motor 10 via the take-up reel motor drive circuit 9 so that the tape 3 is at a constant speed. The rotation speed is controlled.

When the reproduction mode is instructed at time t0 shown in FIG. 2, a deceleration process similar to that shown in FIG. 9 is started, as shown in FIG. 2(a). That is, the tape speed reference information generator 7 outputs a speed signal TCm that is one rank lower than the current transport speed of the tape 3. On the other hand, the tape speed detector 6
Rotation pulse signals are applied to the supply reel pulse generator 5 and the take-up reel pulse generator 4, respectively, and a signal representing the actual transport speed of the tape 3 is outputted by calculations to be described later. The speed error calculator 8 calculates the difference between the output of the tape speed detector 6 and the output of the tape speed reference information generator 7, and provides this value to the take-up reel motor drive circuit 9. The instruction signal from the tape speed reference information generator 7 is transmitted to the tape speed detector 6.
When the output is smaller than the output, the speed error calculator 8 instructs the take-up reel motor drive circuit 9 to decelerate. Therefore, the rotational speed of the take-up reel 1 decreases, and eventually the speed signal TCm
The transfer speed is shown as . The tape speed reference information generator 7 again outputs a speed signal TCm-1 which is one rank lower than the first commanded speed, and continues to give a deceleration command to the reel motor 10 via the speed error calculator 8. In this way, the speed signal TCm-2, which sequentially decreases the tape transport speed,
TCm-3...TC3 and TC2 are output respectively, and for the control target tape speed shown by the broken line in FIG. 2(a),
Tape deceleration control is performed so that the solid line indicates the actual tape speed.

On the other hand, the F/V converters 21 and 22 receive rotation pulse signals from the take-up reel pulse generator 4 and the supply reel pulse generator 5, convert the values into voltage signals, and output the voltage signals. The adder 23 adds the analog voltage signals from the F/V converters 21 and 22, and approximately detects the transport speed of the tape 3.

The rotation angular velocity of the take-up reel 1 is ω1, the rotation period is T1, and the tape winding diameter is r1, and the rotation angular velocity of the supply reel 2 is ω2, the rotation period is T2, and the tape winding diameter is r.
2, the actual transport speed v of the tape 3 is as follows. v=r1 ω1 =r2 ω2 T12+T22 =(2π/ω1)2 +(2
π/ω1 )2 = 4π
2 ・(r1 /v)2 +4π2 ・(r2 /v)
2 = 4π2 ・(r1
2+r22)/v2 However, π
・(r12+r22)=constant Therefore, v2=K
(T12+T22) ...(1)
Also, ω1 +ω2 =v/r1 +v/r2 =v(1
/r1 +1/r2 ) =v(r
1 + r2 )/(r1 × r2 )
=v・f(r1,r2)
(2) Equation (1) indicates the square value of the tape speed v obtained from the tape speed detector 6. Furthermore, as shown in equation (2), the output of the adder 23 is a function f(r
1, r2), which approximately indicates the transport speed of the tape 3. The output of the adder 23 is the comparator 2
5, the reference output of the reference information generator 24 refs
compared to

Until the time t1 when the target control speed instructed by the tape reference information generator 7 becomes zero, F
The output waveforms of the /V converters 21, 22 and adder 23 are shown in Figure 2 (
It changes as shown in b), (c), and (d). As is clear from this figure, rather than obtaining the rotational speed of the take-up reel 1 or the supply reel 2 independently, by adding both signals in the adder 23, a continuous high rotation speed corresponding to the tape transport speed can be obtained. It can be seen that a level signal can be obtained. That is,
Using the result of addition of the rotational speeds of both reels has the advantage that even if the tape 3 changes from the beginning to the end of winding, there is little variation in the output of the adder 23 for the same tape speed. Therefore, from the output of the adder 23, it is possible to more accurately determine whether the tape transport speed is almost at a standstill.

At time t1, when the tape transport speed approaches the target speed, the output of the adder 23 decreases as shown in FIG. 2(d). Then, at time t3 when the output of the adder 23 becomes smaller than the reference output Refs outputted from the reference information generator 24, the output of the comparator 25 causes the first tape drive means to move as shown in FIG. 2(e). 26th to 2nd
The tape driving means 17 is switched to the one shown in FIG. Therefore, the pinch roller 14 is activated by the pinch roller drive circuit 13 and comes into pressure contact with the cap stan 15 via the tape 3. That is, tape transfer control in playback mode is performed.

As described above, according to this embodiment, each F/V
By providing converters 21, 22 and adder 23,
The state where the tape 3 is about to stop can be accurately detected, and the first tape drive means 26 can be switched to the second tape drive means 17 at this timing. Therefore, it is no longer necessary to provide idle time such as waiting for a certain period of time after the tape control target speed becomes zero, as in the conventional case, and the time required to change the tape transport speed can be shortened.

Next, a tape drive device in a second embodiment will be explained. FIG. 3 is a block diagram showing the overall configuration of a tape drive device in a second embodiment of the present invention. Components that operate in the same manner as in the conventional example and the first embodiment are given the same reference numerals and detailed explanations will be omitted. In this figure, the take-up reel rotation direction detector 29 detects the rotation direction by comparing the phases of two-phase output pulses given from the take-up reel pulse generator 4. The respective outputs of the take-up reel pulse generator 4, the supply reel pulse generator 5, and the take-up reel rotation direction detector 29 are given to a microcomputer 30. The microcomputer 30 has a memory that stores a program for operating procedures to be described later, an arithmetic unit that performs calculation processing, an interface unit for external circuits, and the like. section 32, speed error calculation section 33, switching processing section 3
4. The function of the timer section 35 is achieved. The memory of the microcomputer 30 also stores a first set time T0 and a second set time T1, which will be described later.

Next, each output of the microcomputer 30 is given to a pinch roller drive circuit 36 and a take-up reel motor drive circuit 37. The pinch roller drive circuit 36 receives instructions from the microcomputer 30 and presses or releases the pinch roller 14 against the capstan 15. The take-up reel motor drive circuit 37 controls the rotation of the take-up reel motor 10 by increasing or decreasing the torque of the take-up reel motor 10 according to the polarity of the rotation direction of the take-up reel 1 based on the output detected from the take-up reel rotation direction detector 29. It is something to do. In the above configuration, the first tape drive means 38 includes the take-up reel pulse generator 4, the supply reel pulse generator 5, the reel motor 10, the microcomputer 30, and the take-up reel motor drive circuit 37. The second tape drive means 39 includes a pinch roller drive circuit 36, a pinch roller 14, a capstan 15, and a capstan drive circuit 1.
6.

Next, regarding the operation of the second embodiment, FIGS. 2 and 7
This will be explained using the time chart and the flowcharts shown in FIGS. 4 to 6. When the VTR is in fast forward mode,
The microcomputer 30 compares the tape speed v obtained from the tape speed detection section 31 with a set speed signal TCn that is a predetermined multiple faster than the tape transport speed of the reproduction mode selected by the tape speed reference information generation section 32. Then, the tape 3 is passed through the take-up reel motor drive circuit 37.
The rotational torque of the reel motor 10 is controlled so that the speed is constant.

FIG. 4 is a flowchart in which the reproduction mode is instructed at time t0 shown in FIG. 2 and the tape 3 is decelerated. When the deceleration process starts, in step 40, the microcomputer 30 selects a speed signal TCx (initially designated as TCm) lower than the current traveling speed. Here, a speed signal TCm that is one rank lower than the current speed signal TCn is output. Then, in step 41, it is checked whether the speed signal is TC0. This speed signal is an instruction to start deceleration, and since its value is not zero, the process advances to step 42 and the take-up reel motor drive circuit 37
Give a rotation control signal to. Then, in the next step 43, the microcomputer 30 reads the pulse periods of the take-up reel pulse generator 4 and the supply reel pulse generator 5, and measures the tape transport speed v using the above-mentioned equation (1). When this value is larger than the speed signal TCm, the reel motor 10 is
A deceleration signal is output to reduce the drive torque of the reel motor 10. If the transport speed v of the tape 3 becomes almost the same as the speed signal TCm in step 44, the process proceeds to step 45, where the pointer X is decremented, and step 4
Return to 0. Then, the tape speed signal of the tape speed reference information generating section 32 in the microcomputer 30 is switched to TCx, which is one rank lower, and the take-up reel motor drive circuit 3
Similar deceleration processing is performed via 7.

Steps 41, 42, 43, 44, 4
When the transport speed v of the tape 3 decreases through step 5 and reaches a state on the verge of stopping, a speed signal TC0 representing the stop of transport of the tape 3 is output in step 41. Speed signal T of tape 3
When C0 is output, the process proceeds from step 41 to step 46, where the timer section of the microcomputer 30 is activated. Next, the programs of the tape stop processing routine 47 and the pinch roller on/off processing routine 48 are executed simultaneously. 5 and 6 show the microcomputer 30
3 is a flowchart showing the operational procedure of tape stop processing and pinch roller on/off processing.

When the microcomputer 30 outputs a tape stop signal, the operation of the tape stop processing routine 47 starts as shown in FIG. Check whether When either signal is received, the process proceeds to step 51, where the take-up reel rotation direction detector 29 detects the rotation direction of the take-up reel 1. If it is detected that the take-up reel 1 is in the reproducing direction of the tape 3 (referred to as the CW direction), the process proceeds to step 52, where the take-up reel motor drive circuit 37 weakens the drive torque of the reel motor 10 in the CW direction. If it is detected in step 51 that the take-up reel 1 is rotating in the tape rewinding direction (referred to as the CCW direction), the process advances to step 53 and the drive torque of the reel motor 10 is controlled via the take-up reel motor drive circuit 37. It is controlled to be strong in the CW direction. Steps 51 and 52 provide an instruction to wind the tape 3 in the CW direction without changing its direction since the tape 3 is being transported in the reproduction direction. Further, in steps 51 and 53, when the tape 3 is stopped, the take-up reel 1 is moved due to the vibration of the tape 3.
This assumes a situation in which the winding reel 1 is temporarily reversed, and instructs the take-up reel 1 to be rewound in the CW direction as quickly as possible. Note that if no pulses from the supply or take-up reel are detected in step 50, it is determined that the tape 3 has stopped from the beginning, and no instruction is given to the take-up reel motor drive circuit 37.

FIG. 6 is a flowchart showing the operating procedure of the pinch roller on/off processing routine 48 of the microcomputer 30. FIG. 7 is a time chart showing the progress from when the tape 3 deceleration instruction is executed until the first tape drive means 38 is switched to the second tape drive means 39. When the speed signal TC0 indicating the stop of the tape 3 is given at time t1 in the figure, the elapsed time T from time t1 is measured. The first set time T0 held in the memory of the microcomputer 30 is shorter than T1 and represents the time during which the pinch roller 14 is forcibly turned off. Further, the second set time T1 is a value set with a margin of time from time t1, and indicates the elapsed time for switching to the second tape drive means 39.

Now, when the operation of FIG. 6 starts, step 6
0, it is checked whether this elapsed time T exceeds the set time T0. If this time T0 is exceeded, step 61
Then, the rotation direction of the take-up reel 1 is checked by the take-up reel rotation direction detector 29. Also, if the elapsed time T does not reach the set time T0 in step 60, step 6
2, the pinch roller 14 is held in an off state by the second tape drive means 39. Take-up reel 1 is CW
If it is rotating in the direction, the process advances from step 61 to step 63, and it is checked whether or not the set time T1 has elapsed. If the set time T1 has not elapsed, the process moves to step 62 and the pinch roller 14 is kept off. Time t when set time T0 has elapsed from time t1 in FIG.
4, when the tape 3 is once stopped and reversed as shown by the solid line B, the microcomputer 30 issues an instruction via the pinch roller drive circuit 36 to turn on the pinch roller 14 at this time t4. Further, as shown by the dashed line C in FIG. 7, when the tape 3 is about to gradually stop in the CW direction, the time t is reached after the set time T1 has elapsed from the time t1.
At step 5, the pinch roller 14 is turned on.

Here, in step 43, the microcomputer 30 controls the function of the tape speed detection section 31 which calculates each pulse signal of the take-up reel pulse generator 4 and the supply reel pulse generator 5 and converts it into a tape transport speed. In steps 40 and 45, the function of the tape speed reference information generating section 32 for instructing the tape transport speed is achieved. Further, in step 44, the microcomputer 30 performs the function of a speed error calculation section 33 that calculates the error between the output of the tape speed detection section 31 and the output of the tape speed reference information generation section 32. The microcomputer 30 performs steps 51, 52, and 52 shown in FIG.
53, the function of the switching processing unit 34 for switching tape transport from the pinch roller drive circuit 36 to the take-up reel motor drive circuit 37 is achieved, and in steps 60 and 63 of FIG. 6, an instruction to stop tape transport is issued. The timer section 35 functions to switch tape transport to the second tape drive means 39 when a preset time has elapsed.

As described above, when the tape stop signal is given from the tape speed reference information generating section 32 of the microcomputer 30, the first tape drive means 38 quickly starts depending on the direction of rotation of the take-up reel 1 in the transient state at the time of stop. from the second
It is possible to switch to the tape drive means 39. That is, the rotational direction of the take-up reel is checked while the tape is stopping, and the reel motor 10 is optimally controlled according to the current rotational direction. Therefore, unlike the conventional example, there is no need to provide a waiting time when the tape 3 decelerates rapidly and once stops. That is, by executing the operation procedure of the pinch roller on-off processing section, the tape 3
Once it stops and starts moving in the opposite direction, it is possible to quickly switch from the first tape drive means 38 to the second tape drive means 39 even during the waiting time.

[0037]

As described above in detail, according to the invention of claim 1 of the present application, the rotational pulse signals of the supply reel pulse generator and the take-up reel pulse generator are converted into voltage signals respectively and sent to the adder. When input, the speed of the tape just before it stops can be accurately detected using an analog signal. When the tape transport speed obtained in this way becomes lower than the reference information output from the reference information generator, the first tape drive means is quickly switched to the second tape drive means. Therefore, when switching from a high-speed tape forwarding mode to a constant-speed playback mode, etc., there is no need to perform time-consuming control such as stopping the tape once and allowing the tape to run after a certain amount of play time has passed. This provides the effect of being able to switch to playback mode.

Furthermore, according to the invention of claims 2, 3, and 4 of the present application, the tape speed reference information generating section outputs a signal for sequentially decelerating the tape transport speed, and the signal is compared with the signal from the tape speed detecting section. By controlling the tape transport speed,
The tape 3 can be stably stopped regardless of the magnitude of inertia including the tape on the tape supply and take-up reels. When an instruction is given to switch the tape from a high-speed fast-forward mode to a constant-speed playback mode, etc., the reel motor is controlled in accordance with the transient state in which the tape stops, and the second tape drive means switches to a constant-speed playback mode. Can be done. In this way, there is no need to provide a frequency-voltage converter for converting the rotational pulse of the reel into a voltage signal, and it is possible to quickly switch from tape fast-forward mode to playback mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a tape drive device in a first embodiment of the present invention.

FIG. 2 is a time chart showing waveforms of each block of the tape drive device in the first embodiment of the present invention.

FIG. 3 is a block diagram of a tape drive device in a second embodiment of the invention.

FIG. 4 is a flowchart when performing tape deceleration processing of a tape drive device in a second embodiment of the present invention.

FIG. 5 is a flowchart when performing tape stop processing of a tape drive device in a second embodiment of the present invention.

FIG. 6 is a flowchart when performing pinch roller on/off processing of the tape drive device in the second embodiment of the present invention.

FIG. 7 is a time chart of tape deceleration processing of the tape drive device in the second embodiment of the present invention.

FIG. 8 is a block diagram showing an example of a conventional tape drive device.

FIG. 9 is a time chart showing output signals of each block of a conventional tape drive device.

[Explanation of symbols]

1 Take-up reel 2 Supply reel 3 Tape 4 Take-up reel pulse generator 5 Supply reel pulse generator 6 Tape speed detector 7 Tape speed reference information generator 8 Speed error calculator 9, 37 Take-up reel motor drive circuit 10 Reel Motors 13, 36 Pinch roller drive circuit 14 Pinch roller 15 Capstan 16 Capstan motor drive circuit 17, 39 Second tape drive means 21, 22 F/V converter 23 Adder 24 Reference information generator 25 Comparator 26, 38 First tape drive means 29 Take-up reel rotation direction detector 30 Microcomputer 31 Tape speed detection section 32 Tape speed reference information generation section 33 Speed error calculation section 34 Switching processing section 35 Timer section

Claims (4)

[Claims] 1. A supply reel pulse generator that generates a pulse signal as a tape supply reel rotates; a take-up reel pulse generator that generates a pulse signal as a tape take-up reel rotates; A tape drive device comprising: a first tape drive unit that controls high-speed transfer of the tape between tape take-up reels; and a second tape drive unit that controls constant-speed transfer of the tape using a capstan and a pinch roller. , the first tape drive means:
a first frequency-to-voltage converter that converts the frequency of the pulses of the take-up reel pulse generator into a voltage signal; and a second frequency-to-voltage converter that converts the frequency of the pulses of the supply reel pulse generator into a voltage signal. an adder for adding the output of the first frequency-voltage converter and the output of the second frequency-voltage converter; and a reference for holding reference information of the tape speed immediately before the tape transport is stopped. an information generator; and a comparator that provides a switching signal to the second tape drive means when the output of the adder becomes smaller than the output value of the reference information generator, A tape drive device characterized in that switching from the drive means to the second tape drive means is performed by a switching signal from the comparator. 2. A supply reel pulse generator that generates a pulse signal as the tape supply reel rotates; a take-up reel pulse generator that generates a pulse signal as the tape take-up reel rotates; A tape drive device comprising: a first tape drive unit that controls tape transfer between tape take-up reels; and a second tape drive unit that controls tape transfer using a capstan and a pinch roller; The first tape drive means includes a take-up reel rotation direction detector that detects the rotation direction of the tape take-up reel, a take-up reel motor drive circuit that drives the tape take-up reel, and the take-up reel pulse generator. a tape speed detection section that detects the tape transport speed based on the pulse signal of the supply reel pulse generator and the pulse signal of the supply reel pulse generator; a tape speed reference information generation section that instructs the tape transport speed; and the tape speed detection section. a speed error calculating section for calculating an error of the output of the tape speed reference information generating section with respect to the output of the tape speed reference information generating section; A tape drive device comprising: a switching unit that switches tape transport to tape transport means. 3. The switching processing section is configured to switch from a state in which the tape is transferred by the first tape drive means to a state in which the tape is transferred by the first tape drive means.
When switching to transport by the tape drive means, a control signal is sent to the take-up reel to increase or decrease the torque of the take-up reel drive motor according to the rotation direction of the take-up reel based on the output of the take-up reel rotation direction detector. 3. The tape drive device according to claim 2, wherein the tape drive device is provided to a motor drive circuit. 4. The first tape drive means causes the tape to be transferred to a second time when a preset time has elapsed after the tape speed reference information generation section issues an instruction to stop the tape transfer. 4. The tape drive device according to claim 2, further comprising a timer section for switching to the tape drive means.