JPH10222958A - Magnetic recording/reproducing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the impairment of a tape by an edge of a tape cleaner which is caused by minute vibrations due to an error of a servo system at the time of stoppage of the tape. SOLUTION: This equipment is constructed of reels 2 and 3, a magnetic head 4, a tape cleaner 7, a pump 10, a tape lifter 11 and a solenoid valve 9 and the amount of projection of an edge of the tape cleaner 7 to a tape 2 is -0.04-0mm, while an air suction port of the pump is connected to the tape cleaner 7 and a blow-off port thereof to the tape lifter via the solenoid valve. Air from the tape cleaner is let out into the atmosphere at the time when the tape runs, while it flows to the tape lifter when the tape stops. At the time when the tape runs, the tape and the edge of the tape cleaner are brought into contact with each other by the suction of the air and cleaning of the tape is conducted, while a pressure in the tape cleaner lessens at the time of the stoppage of the tape and thereby the contact can be removed. The effect of cleaning of the tape can be attained and also impairment of the tape at the time of the stoppage can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus using a flexible recording medium such as a magnetic tape. The present invention relates to a measure for preventing the occurrence of tape scratches due to the running system by vibrating minutely.

[0002]

2. Description of the Related Art A general magnetic tape device has a supply-side reel and a take-up side reel, a magnetic head having a conversion element for writing and reading information to and from a tape, and a tape suitable for the magnetic head. It is composed of a tape guide for supporting the tape and a tape cleaner for removing dust adhering to the tape so as to have a proper correspondence. Each of the reels is directly connected by a motor, and the rotation of the reel is controlled by a control circuit, a power amplifier, or the like, so that the tape runs at an appropriate speed and tension, and the tape is recorded and reproduced by a magnetic head. Such a traveling system is disclosed in J.J.
RES. DEVELOP. VOL. 30 NO. 6 N
OVEMBER 1986, p. 635-644.

[0003] Since the tape is used after being exchanged, dust adheres to the tape and also generates dust from the tape itself. If dust adheres to the tape, the contact between the tape and the recording / reproducing element of the magnetic head is hindered, which hinders recording / reproducing. Therefore, a tape cleaner is provided on the tape traveling path for the purpose of removing dust and the like attached to the tape. The tape cleaner consists of two opposite blades,
The tape runs while the blade and the tape are slightly in contact with each other, and the air in the space formed between the two blades and the tape in contact with the tape is sucked by a pump to remove dust adhering to the tape. It is a mechanism to remove it. Naturally, a negative pressure (a state in which the pressure is lower than the atmospheric pressure) exists in this space.

[0004]

The operation of the magnetic tape device runs in accordance with the amount of information recorded on or reproduced from the tape or from the tape, and stops when the information is no longer necessary such as when the information is lost. Then, the state is maintained until the next recording / reproduction command is issued, and usually, the tape is often kept under tension to smoothly perform the next traveling. In that case, the following problem may occur. The motor is provided with a disk-shaped encoder having a slit of several hundred pieces / periphery for grasping the rotation state, for example, when stopping after running the tape at the time of recording and reproducing information, Just the Nth and N + 1 of that slit
If a control command for positioning between the second slits is generated, the two slits come and go. This phenomenon becomes more conspicuous as the number of slits on the circumference of the encoder of the motor is smaller. This means that the motor repeats minute vibration (rotation) while the tape is stopped, which leads to generation of minute tape vibration in the tape running direction. Considering only the part that is in contact with the blade of the tape cleaner, the vibration caused, for example, repeated tens of thousands of beats in the same place of the tape with the tape stopped for several minutes, and the friction itself, and at that time The magnetic surface of the tape is peeled off due to the heat generated, and scratches are generated so that recording and reproduction cannot be performed. This leads to a failure to write information on the tape or to read the written information, resulting in a serious trouble.

An object of the present invention is to prevent the tape from being damaged by the blade of the tape cleaner and to improve the reliability even in the case where the tape is stopped under tension and the tape vibrates minutely as described above. The purpose is to get a certain driving system.

[0006]

SUMMARY OF THE INVENTION The above-mentioned problem is caused by the fact that the tape vibrates in the running direction while the tape is in a stationary state and the tape strongly contacts the blade of the tape cleaner.
Therefore, in order to prevent this, when the tape is stopped, the amount of travel of the blade of the tape cleaner to the tape is adjusted (retracted) and the vacuum pressure of the tape cleaner is reduced, or the suction of air is stopped, This problem does not occur if the blade is not brought into contact with the blade. At this time, since the tape does not travel, even if the vacuum pressure is reduced or suction is stopped, dust is not caught between the head tapes, and there is no possibility that the recording / reproducing is hindered.

In order to realize the above-mentioned contents, an electromagnetic valve is provided between the tape cleaner and the pump or on the side from which air is blown, and the direction in which air flows therethrough is changed.
It can be easily realized by performing the off and optimizing the positional relationship between the tape cleaner and the tape.

FIG. 2 shows the relationship between the amount of retraction of the tape cleaner with respect to the tape, the vacuum pressure, and the contact between the tape and the blade of the tape cleaner. Measured using a commonly used cartridge type tape having a tape tension of 2.2N and a 1/2 inch. Investigation was conducted using a tape cleaner having a distance between two blades of 9.5 mm. A magnetic tape device using a cartridge type magnetic tape is generally used under the above conditions. In FIG. 2, the horizontal axis indicates the travel amount h, and the vertical axis indicates the pressure in the tape cleaner. The case where the tape comes into contact with the blade of the tape cleaner when air is suctioned at a certain pressure with respect to the travel amount h is shown as ○. , And the case where it is not performed is represented by x. All pressures are set at the values where the tape and blade are in contact, and then
This is a study of whether or not contact is made by changing the amount of business trips. As can be seen from FIG. 2, even if the position of the blade of the tape cleaner is slightly retracted with respect to the position where it comes into contact with the tape, the tape is sucked toward the tape cleaner by suction of the pump. It can be seen that the blades make contact. Therefore, if the travel amount is set to an appropriate value for each pressure, the tape and the blade come into contact with each other, so that the effect of removing dust is not impaired.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. As described above, the configuration of the tape running system of the magnetic tape device 1 has a built-in conversion element (not shown) for writing and reading information on the supply-side reel 2, the winding-side reel 3, and the tape 4. A magnetic head 5, a tape guide 6 for supporting the tape 4 and a tape cleaner 7 so that the tape 4 and the magnetic head 5 have an appropriate relative positional relationship.
And a guide 8 for optimizing the state of contact of the tape with the tape cleaner 7. Each of the reels 2 and 3 is directly connected to a motor (not shown), and controls the rotation of the reel by controlling the electric current supplied to the motor so that the tape runs at an appropriate speed and tension to perform recording and reproduction. A pump 10 is provided in the traveling system, and an air outlet and an air inlet of the pump 10 are connected to a tape lifter 11 and a tape cleaner 7 by hoses 12 and 13, respectively. The pump 10 has a built-in filter (not shown) for supplying clean air to the head side. The tape lifter 11 supplies air from the pump 10 when the tape is at rest and blows it out between the tape 3 and the medium facing surface of the head 4 to prevent sticking therebetween. is there. There is an electromagnetic valve 9 between the tape lifter 11 and the pump 10 for changing the direction of the air flow to the direction of opening the air to the head 4 side and the atmosphere side. The direction of the air supplied between the tapes 3 is changed. The hose 13 from the suction side of the air from the pump 10 is connected to the tape cleaner 7 and removes dust and the like attached to the tape by suction. Normal pumps use high capacity pumps,
It is common practice to add a regulator or the like in the middle of the piping so that the pressure does not change even if the operation changes, but this configuration is used to reduce the cost. These use tapes of about 1/2 inch width, and the tape tension is 1.8-2.2N. The interval between the blades of the two tape cleaners 7 is set to 9.5 mm, and the travel distance of the blades of the tape cleaner 7 is set in a range of −0.04 to 0 mm with respect to the same plane of the tape guide 6 and the guide 8. ing. This can be easily realized by providing a positioning pin on the tape cleaner or adjusting the height using a simple jig.

When the tape lifter is stopped and the air is open to the atmosphere, the pressure in the tape cleaner is -0.01.
The air system may be designed so as to be set to 5 kgf / cm ² or less, and to set the same pressure during the operation of the tape lifter to about 0 to 0.002 kgf / cm ² . That is, the flow path resistance of each pipe is set such that: Normally, the pressure between the head tapes during the operation of the tape lifter is 0.06 to 0.0
Since the pressure is 9 kgf / cm ² , the flow path resistance in the solenoid valve and the optimal pump capacity may be set in consideration of these factors. The pump has an air outlet pressure of 0.1
What has a capacity of 8 kgf / cm ² and a flow rate of about 1.2 lit / min may be used. These can be easily designed by those who know general fluid dynamics.

[0012] Of course, even for a traveling system that does not use a tape lifter, a solenoid valve on the outlet side of the air of the pump can be used.
It goes without saying that the same effect can be realized by opening the valve to the atmosphere or by providing a throttle for the air flow and switching the air flow in the same manner.

By changing the pressure in the tape cleaner as described above, contact between the tape and the blade of the tape cleaner when the tape is stationary can be prevented, and a highly reliable running system with less tape damage can be obtained. Can be.

In the above embodiment, the travel amount of the blade is -0.0.
Although the case of 4 to 0 is described, it is obvious that a similar effect can be obtained by setting an appropriate vacuum pressure even when the business trip amount is other than the above.

[0015]

According to the present invention, the tape can be prevented from contacting the blade of the tape cleaner when the tape is stopped without impairing the effect of removing dust generated from the tape when the tape is running. The tape can be prevented from being damaged, and a highly reliable magnetic recording and reproducing apparatus can be obtained.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment of the present invention.

FIG. 2 is a diagram showing a travel amount of a blade of a tape cleaner and presence / absence of contact between the tape and the blade when the tape is sucked by air.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic tape device, 2, 3 ... Reel, 4 ... Tape, 5
Magnetic head, 6 ... Tape guide, 7 ... Tape cleaner,
8 Guide, 9 Solenoid valve, 10 Pump 11 Tape lifter, 12, 13 Hose.

Claims (5)

[Claims] 1. A supply and take-up reel using a flexible recording medium such as a magnetic tape, a magnetic head for recording and reproducing on a tape, a magnetic head and a tape guide for supporting the tape on both sides thereof, Consists of a pump for supplying air to the traveling system, a tape cleaner consisting of two opposite blades for removing tape debris, and a guide for optimizing the contact state of the tape with the tape cleaner. A magnetic recording / reproducing apparatus that performs recording and reproduction by running a tape on the traveling system, wherein the tape travels during a recording / reproduction operation and waits for recording / reproduction. A magnetic recording / reproducing apparatus characterized in that the suction pressure of air to a tape cleaner is changed between when the apparatus is stationary. 2. A magnetic head comprising: a tape lifter for blowing air for separating the tape from the head surface when the tape is stopped; and a solenoid valve for switching the flow of the air to the tape lifter or the atmosphere. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein each of the magnetic recording / reproducing apparatuses is directly connected to an air blowing side and a suction side of the pump. 3. The air pressure in the tape cleaner during tape running is 0 to -0.01 kgf / cm ² in gauge pressure.
The same air pressure when the tape stops is 0 to -0.002kgf /
^3. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is cm ² . 4. The tape cleaner according to claim 1, wherein the travel distance of the blade of the tape cleaner with respect to the tape contact surfaces of the two guides located before and after the tape running direction of the tape cleaner is -0.04 to 0 mm. The magnetic recording / reproducing apparatus according to claim 3. 5. The tape cleaner according to claim 1, wherein the tape cleaner blade has a retraction amount of -0.04 to 0 mm with respect to the tape contact surfaces of the two guides located before and after the tape running direction of the tape cleaner. The magnetic recording / reproducing apparatus according to claim 4.