JPH0721625A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To surely perform recording/reproducing operations and to enable the use of a cylinder and a cylinder driving device with low unit prices, for which high starting characteristic is not required, by completing the start of cylinder in the state with a small tape load applied to the cylinder at the time of start up and also making the cylinder restart the operation even in the case where the cylinder can not be started due to generation of the state unexpected with a large tape load to the cylinder. CONSTITUTION:A detecting part 117 for cylinder start completion and a processing part 118 for cylinder restart are arranged, and the start is completed in the state with always a small tape load applied to the cylinder by driving the tape after the start completion of cylinder is detected. Also, when the cylinder can not be started in case of an emergency, the recording/reproducing operations are surely performed by unloading the tape and making the cylinder restart the operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a function of recording or reproducing a signal on a tape from a loading stop.

[0002]

2. Description of the Related Art In recent years, a technique for shortening the mode transition time from the operation of recording / reproducing, fast-forwarding / rewinding, etc. to the start of the actual operation has become widespread, and the mode is often changed from loading stop. ing.

The tape drive operation when performing the recording or reproducing operation from the conventional loading stop will be described below.

FIG. 4 is a basic block diagram showing a loading stop in a VTR, and FIG. 5 is a block diagram showing a configuration relating to tape running from a conventional loading stop.

First, in FIG. 4, 401 is a cylinder,
Reference numeral 402 is a capstan, 403 is a mechanical portion of a loading motor and a loading motor drive system, 404 is a pinch roller, 405 is a cassette tape, and 406 is a microprocessor for controlling 401, 402, 403, and 404.

Next, in FIG. 5, 501 is a cylinder, 502 is a capstan, 503 is a loading motor, 504 is a cylinder drive section, 505 is a capstan drive section, 506 is a loading motor drive section, 507 is a microprocessor, and 508. ˜514 are internal devices of 507 and are configured by software, 508 is a motor rotation command unit, 509 is a cylinder speed error detection unit, 510
Is a cylinder torque command data generator, 511 is a cylinder speed reference generator, 512 is a cylinder lock detector, 513 is a capstan controller, and 514 to 516 are 5
In the hardware part inside 07, 514 is a cylinder torque command D / A, and 515 is a capstan torque command D.
/ A and 516 are input capture, detect rising or falling edge of externally input signal, generate input flag that can be read by software, and use internal free running counter data as input time when edge is detected. It is a mechanism for storing in a register.

The operation of the loading stop and the system for driving the tape from the loading stop configured as described above will be described below.

First, the loading stop will be described with reference to FIG. What is loading stop?
Insert the cassette tape, drive the loading motor 403 by the microprocessor 406 to perform the loading operation, stop the cylinder 401 and the capstan 402, and further perform the pinch roller 404 release operation by the loading motor 403 to apply the tape to the cylinder 401. It refers to the state where the load is reduced.

Next, the tape running operation in the recording or reproducing operation from the conventional loading stop will be described with reference to FIG.

A cylinder rotation mode command F5a is issued from a motor rotation command unit 508 inside the microprocessor 507.
Is output, and in the cylinder speed error detection unit 509,
The cylinder starting torque command data is sent to the cylinder torque command data generating unit 510 via the cylinder speed error data register R5c, the cylinder torque command data generating unit 510 determines the cylinder torque command data register R5d, and the cylinder torque command D / A514
And transmits it to the cylinder drive unit 504 as a cylinder torque command S5a to start the activation operation of the cylinder 501. Then, the cylinder FG signal S5e generated by the rotation of the cylinder is captured by the input capture 516, the cylinder FG input flag F5c is set inside the input capture 516, and the cylinder FG arrival time register R5a is stored with the cylinder FG arrival time. .

Then, the cylinder speed error detection unit 509
At F5c, R5a and cylinder speed reference time data register R5b, the cylinder speed reference time data is used to calculate cylinder speed error data, which is stored in R5c. Then, the cylinder torque command data generation unit 510 calculates cylinder torque command data based on R5c, stores it in R5d, transfers it to the cylinder torque command D / A 514, and transmits it to the cylinder drive unit 504 as S5a. Controls the rotation of the cylinder.

Also, every time F5c is set in the cylinder speed reference generation unit 511, the expected input time of the next cylinder FG signal is calculated and stored in R5b.

Simultaneously with the cylinder starting operation, the rotation command unit 508 outputs a pinch roller crimping command S5c to the loading motor driving unit 506 to activate the loading motor 503 to perform the pinch roller crimping operation.
Subsequently, the rotation command unit 508 outputs the capstan rotation mode command F5b, and the capstan control unit 513 and the capstan torque command D / A515 generate the capstan torque command S5b to generate the capstan drive unit 505.
To control the rotation of the capstan 502.

Further, after the cylinder starting operation, the cylinder lock detector 512 outputs the cylinder PG signal S.
When the input of 5f cannot be detected for a certain period of time or more, it is determined that the cylinder is in an abnormal mode in which the cylinder cannot rotate, and the cylinder lock detection unit 512 detects the cylinder lock detection flag F5
When d is set and F5d is input to the rotation command unit 508, the rotation command unit 508 immediately determines that the recording / reproducing operation cannot be executed, stops the output of F5a and F5b, and issues the pinch roller release command S5d to the loading motor drive. Part 506
To release the pinch roller and return to the loading stop.

[0015]

However, in the above-described conventional configuration, in the recording or reproducing operation from the loading stop, the starting operation is started from the state where the cylinder is stopped, and at the same time, the pinch roller is pressed and the tape is driven by the capstan drive. Therefore, the tape load on the cylinder becomes large during the cylinder starting operation, and the cylinder cannot be started due to the large tape load and the recording or reproducing operation cannot be performed. Therefore, in order to avoid such a situation, it is necessary to use a cylinder and a cylinder drive section having good starting characteristics, which increases the unit price.

[0016]

In order to solve the above problems, according to the present invention, when a cylinder is started from a loading stop, firstly, a cylinder start completion detecting unit is installed so that the cylinder starts after the cylinder start operation. After detecting that it has completely started, the pinch roller crimping operation,
A mechanism to drive the capstan, and secondly, if a cylinder restart operation device is installed and the cylinder start operation starts, if the cylinder cannot be started and the first cylinder lock is detected, unloading is performed. It has a mechanism to start the cylinder again in the unloading state after the operation, and after the completion of the cylinder start is detected by the first mechanism, the loading operation, the pinch roller crimping operation, and the capstan drive are executed again. There is.

[0017]

With this configuration, it is possible to complete the start-up with a small tape load on the cylinder at the time of starting the cylinder during the recording / reproducing operation from the loading stop, and in the unlikely event that the tape load on the cylinder is large. Even if the cylinder could not be started due to unloading, it is possible to reliably perform recording and playback by unloading once and restarting the operation, and to provide a low-priced cylinder and cylinder drive device that does not require high starting characteristics. Can be used.

[0018]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of this embodiment. In FIG. 1, 101 is a cylinder, 102 is a capstan, 103 is a loading motor, 104 is a cylinder drive unit, 105 is a capstan drive unit, 106 is a loading motor drive unit, 107 is a microprocessor, and 108 to 114 are microprocessors 107. The internal device is composed of software, 108 is a motor rotation command unit, 109 is a cylinder speed error detection unit, 11
0 is a cylinder torque command data generation unit, 111 is a cylinder speed reference generation unit, 112 is a cylinder lock detection unit, 113 is a capstan control unit, and 114 to 116 are 1
In the hardware inside 07, 114 is a cylinder torque command D / A, and 115 is a capstan torque command D / A.
A and 116 are input captures. Then, a cylinder activation completion detection unit 117 and a cylinder restart processing unit 118 are newly installed.

Further, S1a to S1i are interface signals between the microprocessor 107 and an external device.
a is a cylinder torque command, S1b is a capstan torque command, S1c is a pinch roller pressure command, S1d is a pinch roller release command, S1e is a cylinder FG signal, S1.
f is a cylinder PG signal, S1h is a cylinder restart unloading command, and S1i is a loading command after the cylinder restart process.

Further, F1a to F1h are flag signals inside the apparatus 107, F1a is a cylinder rotation mode command, and F1a is a cylinder rotation mode command.
1b is a capstan rotation mode command, F1c is a cylinder FG input flag, F1d is a cylinder lock detection flag, F1e is a cylinder start completion flag, F1f is a cylinder restart mode flag, F1g is a cylinder lock mode flag, and F1h is a cylinder start torque output. This is a completion flag.

Further, R1a to R1f are registers inside the microprocessor 107, R1a is a cylinder FG arrival time register, R1b is a cylinder speed reference time data register, R1c is a cylinder speed error data register, R1d is a cylinder torque command data register, R
1e is a capstan torque command data register, R1f
Is a pull-in counter.

The operation of the cylinder starting process in the tape drive device at the time of recording and reproducing from the loading stop configured as described above will be described with reference to the flowcharts of FIGS.

First, in the process 201, the motor rotation command unit 108 judges the mode of running the tape. If the result is true, the process 202 is executed. If the result is false, the cylinder is restarted in the process 215. Initialize processing related flags (clear F1f and F1g), then release the cylinder rotation mode command (clear F1a) in process 216, and release the capstan rotation mode command (clear F1b) in process 217. ), The pinch roller release command (S1d) is output in process 218 to perform the pinch roller release operation to stop loading.

On the other hand, the process 202 outputs the cylinder rotation mode command (F1a) because it is in the tape running mode, and in the next process 203, it is set when the cylinder activation completion detecting unit 117 determines that the cylinder activation is completed. Cylinder activation completion flag (F1e) is determined to be set, and if the result is true, processes 204 to 2
At 07, a process for driving the tape is performed. If false, the cylinder lock detection process of process 208 is performed. In the process 208, F1 is performed as the cylinder lock detection process.
If the result is false, the process is ended by waiting for the completion of activation during the cylinder activation operation. However, if true, the cylinder lock is detected and the process 209 reactivates the cylinder. If the start mode is judged (F1f is set) and the result is false, it means that the tape load on the cylinder is too large to start the cylinder during the cylinder start operation from the loading stop. After entering the restart mode (F1f is set), the process 211
Then, S1h is output to perform the unloading operation, the tape load on the cylinder is removed, and the output of S1h is stopped after the unloading operation is completed. Then, even in the unloading state, F1a is output and the cylinder starting operation is continuously performed, and in the next process 203 execution, the cylinder starting completion judgment is again made.

If the result of the process 209 is true, it is determined that the cylinder cannot be started even in the unloading state and the process 219 sets the cylinder lock mode flag (F1g). In step 212, F1a is cleared to stop the cylinder starting process, and in step 213, S1i is output to perform the loading operation and the process proceeds to the loading stop. Then, in process 214, the tape running mode is forcibly released because recording and reproduction cannot be executed.

On the other hand, in the process 204, the cylinder restart mode determination (F1f set determination) is performed as processing when the cylinder startup has already been completed, and if the result is true, unloading for cylinder restart is performed. It is indicated that the cylinder is activated after the operation. Therefore, in step 205, S1i is output to perform the loading operation, and when the result is false, it indicates that the cylinder has been smoothly activated from the loading stop. The processing is moved to 206. In process 206, a pinch roller crimping command (S1c) is output to perform the pinch roller crimping operation, and subsequently, in process 207, a capstan rotation mode command (F1b) is output to rotate the capstan and drive the tape. . It should be noted that the process 201 is not performed after the tape is driven, and the process is performed by another process, and the details thereof are omitted here.

Next, the cylinder activation completion determination processing will be described. Cylinder rotation mode determination (F1a set determination) is performed in process 301. If the result is false, the cylinder stop mode is set and the cylinder activation torque completion flag (F1h) described below is cleared in process 314, and process 316 is performed. Cylinder stop torque output processing is performed, and subsequently, in process 318, flags and registers related to cylinder activation completion determination processing are initialized (F1e and R1f are cleared). If the result is true, the cylinder start torque output completion determination (F1h set determination) is performed in process 302, and if the result is false, the cylinder start torque output process is performed in process 315, and then process 317. After setting F1h at, the process 318 is executed.

On the other hand, if the result is true, it means that the cylinder starting operation has already started, and the process 3
Cylinder FG input determination (F1c set determination) is performed at 03, and if the result is false, the process ends. If true, process 304 clears F1c in preparation for the next cylinder FG input, In the process 305, the cylinder speed error is calculated by calculating the time difference between the cylinder FG arrival time register (R1a) and the cylinder speed reference time data (R1b), and stored in the cylinder speed error data register (R1c). Then, in process 306, it is determined whether the data of R1c is within the speed control range. If the result is true, it is determined in process 309 whether the cylinder start completion has already been determined. If the result is false, The pull-in counter R1f that counts the number of times the speed error data of the cylinder enters the control range is incremented. And process 31
1, the cylinder start completion condition, that is, the determination that the speed error data is within the control range of eight consecutive times (R1
f = 8) is performed, and if the result is false, the cylinder torque command data is determined in process 319 and is output to the device 104 as a cylinder torque command (S1a), and the next cylinder FG is expected to arrive in process 313. Update time data. If the result is true, in process 312, the cylinder starting operation is started and then F1e indicating that the starting is completed is set, the cylinder starting completion determination is ended, and processes 319 and 313 are performed.

If the result of the process 306 is false, the rotational speed of the cylinder has not reached the control range after the start of the cylinder startup operation, and the speed error of the cylinder is detected as the maximum acceleration or the maximum deceleration data in the process 307. As a limit process, and subsequently, in process 308, initialization of flags and registers related to the cylinder activation completion determination process (clear F1e and R1f) is performed.
The processing of 19 and 313 is executed and the processing ends. Note that the cylinder torque command data conversion processing and the cylinder starting torque output processing are already used techniques, and details thereof are omitted here.

[0031]

As described above, according to the present invention, when the recording and reproducing operations are performed from the loading stop, the cylinder start-up detection device and the cylinder restart processing device are installed to start the cylinder. It is possible to complete the startup with a small tape load on the cylinder at the time, and even if the cylinder could not be started due to a large tape load on the cylinder, unload once and restart operation again. By doing so, recording and reproduction can be surely executed, and it is possible to use a low-priced cylinder and a cylinder driving device with a slightly lowered starting characteristic performance.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration in an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the cylinder restart processing device according to the embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of the cylinder activation completion detecting device according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a basic configuration of a conventional VTR loading stop.

FIG. 5 is a block diagram showing a configuration relating to tape running from a conventional loading stop.

[Explanation of symbols]

 101 Cylinder 102 Capstan 103 Loading Motor 104 Cylinder Drive Unit 105 Capstan Drive Unit 106 Loading Motor Drive Unit 107 Microprocessor 108 Motor Rotation Command Unit 109 Cylinder Speed Error Detection Unit 110 Cylinder Torque Command Data Generation Unit 111 Cylinder Speed Reference Generation Unit 112 Cylinder lock detection unit 113 Capstan control unit 114 Cylinder torque command D / A 115 Capstan torque command D / A 116 Input capture 117 Cylinder activation completion detection unit 118 Cylinder restart processing unit

Claims (2)

[Claims] 1. A rotating cylinder equipped with a head for recording or reproducing a signal on a tape, a capstan for moving the tape, and a tape driving operation described below, that is, an operation of pulling a tape out of a cassette and winding it around the rotating cylinder. The operation of winding the pulled-out tape includes an operation of pressing a pinch roller that feeds out the tape by driving the capstan to press the capstan to the capstan, and an operation of releasing the pinch roller pressed to the capstan. Has a drive unit for
A magnetic recording / reproducing apparatus including a microprocessor for controlling the rotating cylinder, the capstan, and a loading motor, wherein a loading operation is performed, the rotating cylinder and the capstan are stopped, and a pinch roller releasing operation is performed. In the operation of recording or reproducing from a state in which the tape load applied to the rotating cylinder is reduced, a cylinder startup completion detecting unit for determining that the startup of the rotating cylinder is completed after the startup operation of the rotating cylinder is provided, and the rotating cylinder is After the start-up is completed, a pinch roller pressure-bonding operation is performed, and then the capstan is started to cause the tape to run, so that the start-up operation of the rotary cylinder is always completed in a state where the tape load applied to the rotary cylinder is small. And a magnetic recording and reproducing device. 2. The rotating cylinder when the rotation phase signal of the rotating cylinder is not detected for a certain period of time or more during the rotation mode of the rotating cylinder after starting the rotating cylinder in the recording or reproducing operation from the loading stop. It has a cylinder lock detection unit that determines that the cylinder is stopped, and when the cylinder lock detection unit determines that the cylinder is stopped, a cylinder restart processing unit that detects whether or not the stop determination is the first time after starting cylinder activation is installed. When it is detected that it is the second time, it is determined that the cylinder start at the loading stop is impossible, and once again the unloading operation is performed and the starting operation of the rotating cylinder is performed again with the tape load applied to the rotating cylinder eliminated, Loading operation, pinch roller crimping operation, then A magnetic recording / reproducing apparatus in which a tape is driven by driving a capstan.