JPS5877078A - Cleaning device of magnetic tape - Google Patents

Abstract

PURPOSE:To realize the automatic cleaning of a magnetic tape without discontinuing the operation of the tape, by deleting the dust with a cleaner plate having numbers of holes in a range covering the full width of the tape while the tape is driven at a normal speed and then using a cleaning ribbon which is put between the cleaner plate and the tape during a high-speed driving mode of the tape respectively. CONSTITUTION:A cleaner plate 40 has numbers of holes which touch a tape through full width of a magnetic tape 10 when the tape is travelling. Thus the dust sticking to the tape is deleted by a cleaner 39 during a normal driving mode. On the other hand, a cleaning bond 50 is put between the plate 40 and the tape 10 to delete the dust sticking to the tape and the plate 40 during a high- speed driving mode of the tape such as a rewind mode, etc. The dust or the magnetic powder which are scraped off by the plate 40 are removed by an air absorbing device. The cleaner 39 can move back to the tape surface by means of a solenoid 38. Then a ribbon guide 44 can be driven right and left by an air pressure device containing an air pressure hose 47, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for automatically crimping a magnetic tape without operator intervention in order to improve the reliability of the device, for example in a rotary head type magnetic tape recording device; The present invention relates to a cleaning device designed to perform cleaning operations.

Conventionally, the magnetic tape used in rotary head type magnetic tape recording devices and the like has been of general type K.

It is prepared by cutting a magnetic sheet, which has a magnetic coating film on a base sheet such as a polyester sheet, into an appropriate width using a cutting machine. For this reason, chips generated during cutting adhere to the magnetic coating surface of the magnetic tape, causing so-called dropouts. In order to improve these defects, after cutting the magnetic sheet, a cleaning tape made of paper, cloth, etc. is slid over the magnetic coating film of the magnetic tape to remove dust that has adhered to the magnetic coating surface. A wiping cleaning method was used. However, when cleaning a magnetic tape using this method, the dust that cannot be wiped off by the cleaning member is scattered by vibrations etc. when the rotating head type magnetic tape recording device runs, and the dust that cannot be wiped off by the cleaning member is scattered by vibrations etc. It was not possible to perform a satisfactory cleaning. In addition, in order to clean the magnetic tape, a reel-to-reel type cleaning device (not shown) is required to stop the magnetic tape device in order to remove the magnetic tape.
Too much K is also expensive.

In addition, a reel-to-reel type cleaning device 1c
Cleaning the tape with a knife (not shown) is useful for magnetic tapes whose magnetic layer has a thickness of approximately 2 microns and is used in single-rotation head type magnetic tape recording devices.

Due to the strong contact of the ray 7 edge, the demagnetizing effect due to pressurized demagnetization is large, which causes a reduction in the attenuation of the reproduced signal when traveling many times.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to solve the problem of conventional magnetic tape recording devices. To provide a cleaning device that automatically cleans a magnetic tape without interrupting operation, without operator intervention, and without maintenance.

The present invention provides a first cleaning means equipped with a cleaner plate having a large number of holes that comes into contact with the entire width Kl of the magnetic tape while the magnetic tape is running, and the first cleaning means is provided in the running path of the magnetic tape recording/contrasting device. Peel off the peeled off dust and adhesion bombs from the outside (for example, with an air suction device), and use a one-rotation head to prevent the tape from abrading the cleaner plate and adhering to abrasion powder when the tape is running at high speed, for example, when rewinding. During high-speed rewinding before re-reading by a type magnetic tape recording device, a cleaning ribbon is brought into contact with the entire width of the magnetic tape to clean it.1 During normal tape running, the tape moves to remove any dirt that may be lightly attached to the surface of the cleaner. The present invention is characterized in that the dust is suctioned by the cleaner, and when the dust adheres strongly to the surface of the cleaner, the dust adhering to the surface of the cleaner is cleaned using a cleaning bong.

FIG. 1 is a plan view of a known rotating head type magnetic tape recording device, and FIG. 2 is a simplified perspective view of FIG. 1. The rotary head 18 attached to the rotor 17 placed between the upper mandrel 19 and the lower mandrel 32 in FIGS. That's covered. The tape running mechanism from the supply reel cavity 8o to the take-up reel cavity 81 is constructed as follows. In FIG. 1, the tape 10 in a state 11 that has just completed winding of the tape on the IIL 41 frame hub 90 is shown as a solid line, and the tape 10 is completely unwound from the supply reel hub 84 and most of the tape is completely unwound. 1 roll frame ＾pu? The tape 10 after OK winding is shown in broken lines.

The supply reel cavity 80 is filled with pressurized fluid I! It has an outer wall 91 containing a plurality of air jets connected to 92. The function of these air jets is converted into a propelling force rather than loosening the tape as it is unwound from the supply reel hub 84. Although the tape pushing force is generated by the supply reel hub 84, the air flow does not loosen the tape 10 within the cavity 80; A slit is provided nearby, which peels off the guide edge of the tape and guides the tape into the gap 83, thus allowing the tape 10 to exit the cavity 80 and into the tape path. A photoelectric sensor 85 is provided on the exit side of the gap 85, and the photoelectric sensor 85 senses light from a light source 85g placed on the opposite side of the tape. Therefore, the photoelectric sensor 85 detects the light source 8! due to the opacity of the tape. When the light from $8 is no longer received, the photoelectric sensor 85 senses and indicates that the tape 10 has entered the tape path.To transport the tape 1o across the upper part of the vacuum column 14. Then, II number of air jets create a fluid boundary and guide the tape 1° by creating a Pellelay effect along the inner surface of the upper plate 86. Crossover block 25 generates a plurality of air jets at upper plate 84 when pressurized air is fed through conduit 87 . When the tape 100 guide edge enters the area of the vacuum column 14, the guide edge separates from the barrier.

The jets direct the fluid flow across the bottom surface of the upper plate 86 so that the Bernoulli effect transports it across the vacuum column 14 to the air bearing 15 and to the threading guide 24. The air jets in the upper plate 86 have a forward component that provides an auxiliary force to the tape 10 moving across the upper part of the vacuum column 14, but a forward component that forces the tape 1o across the upper part of the vacuum column 14. The majority of this is generated by the supply reel 84. Once the guide edge of the tape 1o enters the sleeve-in guide 24, the tape 1o is inserted into the upper mandrel 19.
Guided by a channel provided around 0. The transport force that transports the tape 1o through the channel around the mandrel 190 is the pushing force generated by the supply reel hub 84.

Slave ink guide 24 has side walls 94 with respective posts 95 separated by an open space.

The tape 1o from the slave ink guide 24 passes through the air bearing 2o to the winding IIRIIk frame hub 9o. The tape 10 is guided around the air bearing 2o by a bearing cap 26. The tape guide 21 for tape 1° has an air bearing 2 during the tape threading operation.
As the guiding edge of the tape 10 enters the take-up reel cavity 81, the guiding edge of the tape 10 is pulled up from the passage of the 2'' Cf-p by the solenoid 95 in the reel hub 90.
◎ After the tape 10 has been wrapped approximately twice on the take-up reel hub 90, the take-up reel hub 90 is stopped and then the vacuum column 14 is A loop of tape 10 is formed therein.

In Figures 1 and 2, 11 is the spool motor, 12 is the spool bearing, 15.14.29 is the tape guide, 22 is the capstan motor, 23 is the capstan, 50 is the impeller, and 31 is the plunger. be.

The magnetic tape cleaning device of the present invention is applied to the above-mentioned equipment using magnetic tape, and the details thereof will be explained below.

FIG. S is a schematic configuration diagram of the present invention. In Figure 5,
The cleaning ribbon 50 is fed from a supply reel 64 of a ribbon winding device 60 and passes around a roller 66, as shown in the lower part of FIG. It advances to the magnetic tape cleaner section shown in FIG. I4 and enters the capstan roller 67. The capstan roller 67 is rotated on the shaft 72 by frictional force via the roller 68.

Cleaning ribbon 50 enters roller 48. motor 6
9 is connected to the roller 6BK and provides a driving force to the roller 48. The take-up reel 6s is driven by a belt 73 from the roller 68 and takes up the cleaning ribbon 50. Furthermore, the fifth
In the figure, 61 is a ribbon guide 71 that is a shaft.

The cleaning ribbon 50 extends across the moving path of the magnetic tape 10 in FIG. 3 (perpendicular to the page) at the magnetic tape cleaner 39, and surrounds the magnetic tape 10 in the longitudinal direction as shown in FIG. There is.

FIG. 4 is a top view of the cleaning ribbon 50 in a non-operating position. #I5 diagram shows cleaning ribbon 50
FIG. In the state shown in FIG. 5, the cleaning ribbon 50 is placed between the magnetic tape cleaner 59 and the magnetic tape 10.
0 is separated. Also, a magnetic tape cleaner like this! 9 is.

As shown in FIG. 8, for example, Volume IILI in FIG.
It is arranged between the I11 frame 90 and the air bearing 20.

In FIG. 8, the cleaning ribbon 50 is attached to a magnetic tape cleaner 59 and supported by a ribbon guide 44 and guide bins 55 and 54.

FIG. 6 is a perspective view of the main part of FIG. 4, and magnetic powder peeled off from the magnetic surface of the magnetic tape 10 and adhering dust from the outside are removed by a cleaner plate 40 made of stainless steel, for example, having a large number of cleaner holes 41. Magnetic tape cleaner 3
Note that it shows 9.

#II9 The fallen magnetic powder and attached dust are removed by an air suction device consisting of a vacuum hose 46 and a vacuum nozzle 51 connected to the vacuum cavity 55.

71st H! The cleaning ribbon 50 is placed in the operating position shown in FIG.
0 is brought to the front of the cleaner plate 40 and sweeps the magnetic tape cleaner 59 and the magnetic tape 10 f#.

As shown in FIG. 8, the magnetic tape cleaner 39 can be moved and retreated relative to the magnetic surface of the magnetic tape 10 by a cylinder or solenoid 38. That is, the entire magnetic tape cleaner s9 is slidably held on a plate 49 by a guide 48, and 70 sliding movements are made by the cylinder or solenoid! This is done by s8.

On the other hand, the left and right movement of the ribbon guide 44 in FIGS. 4 and 5 is caused by the pneumatic hose 47 (FIG. 8) and the pneumatic nozzle 52 shown in FIG. Piston 94° Cylinder Keller 97
It is carried out by a pneumatic device consisting of a fixed channel 4N,
It is guided by the cleaner guide 45 and slides left and right. The cleaning ribbon 50 is moved at a slow speed of several minutes per minute and can be cleaned automatically for months 4 without maintenance until the next time the ribbon is replaced. The dust Ill removed by the magnetic tape cleaner 59 is transferred to the vacuum nozzle 51. It is discharged via vacuum hose 46.

The 98th article shows the cleaning status of tape dust using the cleaner hole 41 of the present invention! As shown in FIG. 4, a cleaner hole 41 that can contact the entire width of the tape 10 is drilled in the cleaner plate 40, and the dirt 100 on the surface of the tape 100 is scraped off by the 900 corner 105 of the cleaner hole 41.
Vacuum suction is performed from the vacuum cavity 55 shown. In the case of a cleaner hole made of a 90" corner, unlike the conventional cleaner blade made of a knife knife 110 as shown in FIG. In this case, intermittent feeding is performed, but in the case of a square cutting edge using the knife 110, the side cutting angle is set to φ, as shown in FIG. 10(b) K.
Assuming that the front cutting edge angle is φ-, the flaw H on the tape is expressed by a linear equation from ΔABC.

However, S is for forwarding.

Therefore, in the case of the cleaner hole 41 having an angle 105 of 90° with φ'5a9Q'' and φ=0, H=0, that is, the tape will not be damaged, and when the tape is pressurized, the demagnetization effect due to K will occur. It has an effect that never occurs.

According to the present invention described in detail above, the following first-order effects can be obtained.

(1) While running the magnetic tape, tape and cleaner cleaning can be achieved automatically without affecting the magnetic tape travel path, and by moving the cleaning ribbon at low speed, the ribbon can be cleaned next time. It can automatically clean for months without maintenance until replaced.

(2) When cleaning with a knife, short wavelengths,
Demagnetization tends to occur in the signal portion of high-frequency recording, but since the cleaner has many holes, demagnetization due to pressurized demagnetization does not occur.

(3) The cleaner is installed at the end of the tape in the width direction, where the phenomenon of magnetic powder peeling is likely to occur and is the main cause of dropouts, thereby making it possible to alleviate the occurrence and increase of mud and dropouts.

(4) Problems during playback of recorded data can be resolved by preventing head clogging due to peeling off of magnetic powder.

俤) It is possible to prevent the partial erasing effect of the i-brassed tape due to the accumulation of exfoliated magnetic powder.

(6) It is possible to prevent scratches on the magnetic surface due to the deposited and exfoliated magnetic powder.

(7) The magnetic tape cleaner section and the magnetic tape can be cleaned without interrupting the normal operation of the device.

[Brief explanation of the drawing]

Figures 1 and 2 show a known rotary head type magnetic tape recorder.
FIG. 1 is a plan view and a perspective view of the device. 3 to 9 relate to the present invention, and FIG. 3 is a schematic side view of a magnetic tape cleaning device;
FIG. 4 is an upper perspective view when the cleaning means is in the non-operating position, and FIG. 5 is an upper perspective view when the cleaning means is in the operating position. FIG. 6 is a perspective view of a magnetic tape cleaner having a large number of cleaner holes. FIG. 7 is a perspective view of a magnetic tape cleaner and a cleaning ribbon cleaning the magnetic tape.
The figure is a perspective view showing the arrangement of a magnetic tape cleaning device with respect to tape-using equipment, FIG. 9 is a cross-sectional view showing the contact relationship between the tape and the magnetic tape cleaner, and FIG. 10 is a cross-section 111g of a conventional cleaner. 10: Magnetic tape s9: Magnetic tape cleaner 40: Cleaner plate 41: Cleaner hole 44: Ribbon guide 50: Cleaning ribbon 55: Vacuum cavity 60: Ribbon winding device Figure rag 11! ! ] Moe 18

Claims (1)

[Claims] This is a magnetic tape cleaning device installed in the magnetic tape running path, which covers the entire width of the magnetic tape while it is running!
a cleaning means for peeling off and removing dust and debris adhering to the magnetic tape, the cleaner plate having a large number of holes in contact with each other; A cleaning ribbon is inserted between the magnetic tape and the dust attached to the surface of the cleaner plate.