JPS6180545A - Magnetic tape driver - Google Patents

Abstract

PURPOSE:To run stably a tape with a motor having a small torque by measuring a motor supply voltage optimum to a set magnetic tape and running the tape based on measured power when the tape is made run again. CONSTITUTION:When a new cartridge magnetic tape 1 is loaded, a drive command means 26 of a control means 15 supplies signals S5, S7 to a motor power supply means 27 and a speed setting section 25, and supplies a measuring mode signal S6a to a power deciding means 28. The initial power W0 stored in advance in an initial power storage means 29 is read by the means 28 and fed to the means 27, the magnetic tape 1 is made run in the scheduled initial speed via a DA converter 16 and a rotary encoder 21 is driven in the initial speed. A tape speed Vt from a tape speed detector 20 is fed to a tape speed discriminating section 24, compared and discriminated with a setting speed Vf from the speed setting section 25, the result of discrimination is fed to the power deciding means 28, and when the both are not coincident, a new power data W0 is decided and fed to the power deciding means 27.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention measures, when a new tape (unmeasured tape) is installed in the device, the optimum motor supply power value for that tape,
After that, when running the tape again, that is, when recording information on this tape (measurement I simultaneous tape) or reproducing it, run the tape stably based on the measured power value. The present invention relates to a magnetic tape drive device configured as described above.

[Prior Art] In recent years, magnetic tape devices connected to computers and the like have been required to have large storage capacities, and along with this, the recording density when recording information on magnetic tapes has gradually increased. Therefore, it has become necessary to make the running speed of this magnetic tape more stable.

FIG. 3 is a partially cutaway plan view showing a cartridge magnetic tape used in such a device and a part of a mechanism for driving the cartridge magnetic tape. When the motor capstan 3 is rotated by the motor 2, the cartridge magnetic tape capstan 4 in contact with the motor capstan 3 rotates, and the cartridge magnetic tape capstan 4 and the first . A constant tension drive belt 9 running between the second roller 5.6 and the wound magnetic tape 7.8 rotates the magnetic tape 7.8 in opposite directions. When the magnetic tapes 7.8 rotate in opposite directions, the magnetic tape 10 is unwound from one of the magnetic tapes 7.8 and wound around the other magnetic tape.

By the way, for each cartridge magnetic tape, the friction torque of the cartridge magnetic tape,
Since the moments of inertia are different, it is difficult to control the tape running speed to a predetermined value. In order to control the tape at a predetermined speed, it is necessary to drive the tape with a large motor having a large driving force that takes into account the cartridge having the maximum frictional torque among the respective cartridges.

However, in recent years, there has been a strong demand for compact and low-cost recording/playback devices to which such cartridge magnetic tapes are installed, making it impossible to increase the driving force of the motors, and the magnetic tapes cannot be fixed in advance. The problem has arisen that it is difficult to run the vehicle stably at a certain speed.

[Problems to be Solved by the Invention] This invention can stabilize the magnetic tape using a motor with a small driving force, even in the above circumstances and when the friction torque, moment of inertia, etc. of the magnetic tape are different for each cartridge. A magnetic tape drive that can be run! The purpose is to provide h-device.

[Means for solving the problem] To achieve this purpose, a magnetic tape w according to the present invention is used.
! The A-cutting device includes a control means for controlling electric power supplied to a tape drive motor so that the running speed of the set magnetic tape becomes a predetermined set speed; and the tape speed is adjusted to the set speed by the control means. a first storage means that stores the power value when the power value matches the measured power value as a measured power value; means; receiving the set power value stored in the second storage means and the measured power value stored in the first storage means, and calculates a starting power value to be supplied to the motor at predetermined time intervals; The apparatus is characterized in that the set magnetic tape is immediately run at the set speed upon startup based on the stored measured power value.

[Examples] The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1(a) is a circuit block diagram showing an embodiment of a magnetic tape device according to the present invention. In this figure, the CPU (microprocessor) part is divided into functional blocks. In this figure, 15 is a command means (for example,
A microprocessor (CP
U), 16 is a motor power value supply means 2;
A digital/analog converter (D/A converter) 17 converts the power value Wo outputted by 7 into a voltage signal S2.
18 is a power amplifier that amplifies the power of the voltage signal S2 at a predetermined amplification factor; 18 is a motor that rotates with a driving force according to the power S3 output from the power amplifier 17;
5 outputs a power value WD, this power value WD is converted into a driving force according to the magnitude by the D/A converter 16° power amplifier and motor 18, and is attached to the motor 18 by the driving force of B. The motor capstan 19 rotates, and the magnetic tape 10 in the cartridge magnetic tape 1 is rotated.
is driven to travel.

Reference numeral 20 denotes a tape speed detection unit that detects the rotational speed of the motor 18, that is, the running speed of the magnetic tape 10, and a rotary encoder 2 connected to the motor 18.
1 and an oscillator 22 that generates a clock signal, and the output of the rotary encoder 21 passes through the output of the oscillator 22.
A pulse train (
The number of pulses in this pulse train is inversely proportional to the rotational speed of the motor.) A gate circuit 23 outputs a PL ratio. Further, 24 is a tape speed for comparing the tape speed Vt indicated by the number of pulses in the pulse train PL outputted by the tape speed detecting section 20 and the set speed Vf outputted from the speed setting section 25 to determine the magnitude thereof. This is a discrimination section, and the discrimination result (Vt>Vf or 4tVt=-Vf!
Ta! *Vt<Vf) is supplied to the control device, ff115.

In Figure 1 (b), (a) shows the correspondence between the predetermined speed and time, and (b) and (c) show the corresponding correspondence between the supplied power value and time, respectively. This is a diagram. In the figure, (b) is the set power value that is determined in advance at each predetermined time as the starting power value required when starting the magnetic tape, and (c) is the power value that is safe when the tape is running at a constant speed. This indicates the set power value.

Note that these power values are determined in advance through experiments and the like, and are stored as set power values in the second storage device (initial power value storage means). The measured power value and the set power value are read out by the power value determiner stage, and the power to be supplied at the time of starting the actually set magnetic tape is calculated. Then, the set magnetic tape is driven by this calculated power value, and a recording or reproducing operation is performed.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowchart shown in FIG.

Now, if a new cartridge magnetic tape l is installed in a recording and reproducing apparatus equipped with this circuit, this will be detected by the tape device detection circuit (not shown) and the motor will be activated by the drive command means 26 of the control means 15. Drive command Sla,
Measurement mode commands Slb are sequentially supplied (see steps SP1 and SP2 in FIG. 2). Thereby, the drive command means 26 is connected to the motor power value supply means 27 and the speed setting section 25.
signal S5. S? are supplied to each of them to put them into an operating state, and at step SP3, a measurement mode signal Sea is supplied to the power value determining means 28 to set it in the measurement mode. When the power value determining means 28 enters the measurement mode, the power value determining means 28 reads out the initial power data W0 stored in the initial power value storage means 29 in advance, and supplies this to the motor power value supplying means 27. Ru. As a result,
The motor power value supply means 27 supplies the initial power data WO to the D/A converter 16 as power data WD to be supplied to the motor 18, rotates the motor 18 at a speed close to a preset scheduled speed, and rotates the motor 18 at a speed close to a predetermined speed. The magnetic tape in the magnetic tape l is run at an initial speed, and the rotary encoder 21 is rotated at this initial speed. When the rotary encoder 21 rotates, a tape speed V indicating the speed of the magnetic tape is detected from the tape speed detecting section 20 provided with the rotary encoder 21.
t (pulse train PL) is output and supplied to the tape speed determination section 24. Here, the value of this tape speed Vt and the value of the set speed Vf outputted by the speed setting section 25 are compared and determined, and this determination result is supplied to the power value determining means 28.Next, the power value determining means 28 Step SP4 shown in Figure 3
．． Execute SP5 and check the value of tape speed Vt and set speed Vf
If they do not match, that is, if VE>Vf, subtract - constant value K from the power data WD, set this subtraction result (Wo-K) as new power data Wo, and (
(see step SP6 in FIG. 2), and conversely, if Vt<Vf, add the constant K to the power data W[+ and set this addition result as new power data Wo (see step SP7)) This new power Data WO to motor power value supply means 2
7 and change the rotational speed of the motor 18. As a result, the tape speed Vt of the magnetic tape approaches the set speed Vf by one step, but if they do not match, the above-mentioned steps SP4 and SF3 or steps SP5 and SF3 are repeatedly executed to make them match. If these match, the above-mentioned steps SP4 to SP7 are completed and the next step SP8 is executed, and the power value determining means 28 saves the measurement by using the power value data Wo at this time as the measured power data Wc. The power value is stored in the power value storage means 30. Next, step SP9 is executed, and the power value determining means 28
The power data WS- required when starting the magnetic tape IO and the power data WS- when stopping the magnetic tape IO based on a predetermined calculation formula (for example, a calculation formula based on constants obtained from experiments) from the current power data Wo. Necessary power data Wsp is calculated and stored in the measured power saving value storage means 30, and in the next step 5 PIO, the rewinding means 31 of the drive command means 26 rewinds the magnetic tape. Terminates the operation.

In this d111 constant mode, the magnetic tape is actually run based on the initial power data Wo stored in the initial power value storage means 29 and the power data WO, and the magnetic tape obtained at this time is The power data WD finally obtained by correcting the power data Wo until the tape speed Vt of the tape matches the preset set speed Vf is the measured power data Wc, that is, the currently installed cartridge magnetic field. The data is stored in the measured power saving value storage means 30 as power data We for running the magnetic tape 10 of the tape 1 at the set speed Vf.

Next, after the above-mentioned measurement mode is executed, the drive command means 26 receives a motor drive command Slc and a recording/reproduction command Sld.
are sequentially supplied, the drive command means 26 performs step S
P1. Proceed to step SPI l via SP2. In step SPI 1, the drive command means 26 first sends the signal S5
is output to put the motor power value supplying means 27 into the operating state, and at the same time outputting a motor start command S6b to the power value determining means 28.
supply. Thereby, the power value determining means 28 uses the power data wsT stored in the measured power saving value storage means 30.
is read out and supplied to the motor power value supply means 27 to start the motor 18. Next, the drive command means 26 supplies a constant speed running command S6c to the electric power value determination means 28, and also supplies a signal S7 to the speed setting section 25. Thereby, the power value determining means 28 is set to the measured power saving value storage means 30
The power data Wc is read out from the motor power value supply means 27, and the motor 18 is rotated with the power corresponding to the power data Wc (see step 5P12 in FIG. 2). The tape speed Vt of the tape is set incorrectly in the speed setting section 25.
Check whether it matches f, step 5P1
3.14), and if they do not match, the power data We is corrected so as to make them match (see step 5P15), and the magnetic tape is stably run at the set speed Vf. Next, in this state, if a recording/reproduction stop command 31 is supplied to the drive command means 26, the drive means 26 detects this in step 5P13, executes the next step, step 5P16, and sets the power value. A motor stop command S8d is supplied to the determining means 28.

In this way, the power value determining means 28 reads out the power data Wsp from the measured power saving value storage means 30 and supplies it to the motor power value supply means 27, and generates data ( gm rate), this motor 18 is stopped.

As described above, in the recording/playback mode, the results were obtained in the measurement mode. The electric power value given to the motor 18 is calculated and determined based on the electric power data Wc. That is, since the cartridge magnetic tape 1 is run using the electric power value obtained in the measurement mode, even if the cartridge magnetic tape 1 has a different friction torque and moment of inertia than the standard one, the magnetic tape 1 can be stably run at the set speed Vf. This can be done without using a motor with large driving force. Moreover, in this embodiment, feed panning is applied during recording and reproduction to constantly correct the power data We obtained during measurement, so that the running speed of the magnetic tape can be made more stable.

Furthermore, in the embodiment described above, when a new cartridge magnetic tape 10 is installed, the measurement mode is automatically set. Deviation Vt when
-Vf exceeding a predetermined value may be detected, and then the measurement mode may be automatically set when recording/reproduction is completed.

Further, in the above description, it is assumed that no feedback is applied when the motor 18 is started and stopped, but the power data W 57 and W sp may be corrected by applying feedback during these periods.

[Effects] As explained above, when a new magnetic tape is loaded, the magnetic tape drive device according to the present invention performs a test run on this magnetic tape and reduces the power required to run it at a set speed. The power value is measured and the 11j magnetic tape is driven based on this power value during recording/reproduction, so even if the frictional torque, moment of inertia, etc. of the magnetic tapes differ greatly from magnetic tape to magnetic tape, This magnetic tape can be stably run at a set speed using a small, inexpensive motor.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram showing an embodiment of a magnetic tape device according to the present invention, FIG. 1(b) is a time chart for explaining this embodiment, and FIG. 2 is a block diagram for explaining this embodiment. FIG. 3 is a partially cutaway plan view showing an example of a cartridge magnetic tape and a drive mechanism for driving the same. 10... Magnetic tape, l 5-... Control device 1. Otsu”
...Tape speed detection means (tape speed detection section), 2
4...Tape speed determination means (tape speed determination section). 27... Motor power value supply means, 28... Power value determination means, 30... Measured power saving value storage means, 31...
means of rewinding. Figure 2 Figure 3 Procedural amendment (method) % formula % 2 Name of the invention Magnetic tape drive device 3 Relationship with the case of the person making the amendment Patent applicant name Anritsu Electric Co., Ltd. 4 agent Address ios Address Minato-ku, Tokyo Toranomon 1-19-14-5 Date of amendment order: January 9, 1985 (shipment date: 1985)
(January 29, 2017) 6 Description and drawings subject to amendment 7 Contents of amendment

Claims (2)

[Claims] (1) control means (15, 20, 24) for controlling the electric power supplied to the tape drive motor so that the running speed of the set magnetic tape becomes a predetermined setting speed; a first storage means (30) for storing a power value when the speed matches the set speed as a measured power value; a second storage means (29) stored as a value; receiving the set power value stored in the second storage means and the measured power value stored in the first storage means; A power value determining means (28) for calculating a value of starting power to be supplied every predetermined time is provided, and the set magnetic tape is immediately run at the set speed at the time of starting based on the stored measured power value. A magnetic tape drive device characterized by: (2) The control means (15, 20, 24) has a speed detector, and controls the tape speed by receiving an output signal from the speed detector. Magnetic tape drive.