JP2590452B2 - Transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved transfer device for transferring a signal of a master medium to a slave medium.

[0002]

2. Description of the Related Art For example, a magnetic tape transfer device has been proposed in Japanese Utility Model Application Laid-Open No. Sho 63-44214 and is used for producing slave tapes.

That is, as shown in FIG. 9 of the publication,
A device for superposing a slave tape (transferred tape) 2 on a master tape (transfer tape) 1, sandwiching these between a transfer drum 3 and a pressure contact device 4, and applying a bias magnetic field by a magnetic head 5 to perform transfer is well known. ing.

The inventor of the present invention has conducted the transfer using a transfer device similar to the above magnetic tape transfer device, and has found the following inconvenience. Therefore, we conducted various researches and found a solution, and we will explain in detail below.

[0005]

FIG. 9 is an error rate diagram of a slave medium in a conventional transfer device. At this time, the center line average roughness Ra (hereinafter, referred to as “surface roughness Ra”) of the transfer drum surface is 1.0 μm, and the average error rate of the slave medium after transfer is 4.46 × 1.
It was 0 ^-2 . The error rate is (number of erroneous signals) /
It is a dimensionless number calculated by (total number of signals). In the error rate diagram, the horizontal axis is the time axis, and the vertical axis is the logarithmic scale error rate axis (the same applies hereinafter).

FIG. 10 is an error rate diagram of a slave medium after a conventional transfer apparatus has been used for a certain period of time. When the transfer operation is continued for a while on a transfer drum having a surface roughness Ra of 0.08 μm, the error rate greatly fluctuates. I do. Although FIG. 10 is a partial view, it is not clear, but it was recognized that the error rate tended to gradually deteriorate.

In any case, since the error rate is high and the transfer characteristics are not good, there is a need for a technique that has a low error rate and can maintain good transfer characteristics.

[0008]

SUMMARY OF THE INVENTION In order to meet the above demand, the present invention provides a transfer drum having a surface roughness Ra of 0.08 .mu.m.
m or less.

Alternatively, a transfer device is provided with a drum cleaning mechanism for the transfer drum, and the surface roughness Ra of the transfer drum is preferably adjusted to 0.08 μm or less.

[0010]

The surface of the transfer drum has a surface roughness Ra of 0.08 μm.
In this case, the error rate is reduced to a desirable value.

The drum cleaning mechanism always cleans the surface so that the error rate value does not increase.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an error rate diagram of a slave medium in a transfer device according to the present invention. As a result of extensive studies, the present inventors have found that the surface roughness Ra of the transfer drum surface is related to the quality of the error rate. And a surface roughness Ra having an error rate peak of 1.0 × 10 ⁻² and an average value of around 1.0 × 10 ⁻³ was examined. As shown in FIG. 1, the surface roughness Ra was 0.08 μm. Then, it was found that the average error rate was 0.964 × 10 ⁻³ (9.64 × 10 ⁻⁴ ), which satisfies the above value.

Therefore, it is sufficient that the surface roughness Ra of the transfer drum in the transfer device is set to 0.08 μm or less. However, when the transfer drum finished as described above is used to some extent, magnetic powder and dust adhere thereto, and the performance may be deteriorated.

Therefore, the present inventor has found that a drum cleaning mechanism for a transfer drum described below sufficiently eliminates the fear.

FIG. 2 is a diagram showing a first embodiment of a drum cleaning mechanism according to the present invention. A pinch roller 3 is provided in parallel with a non-conductive / non-magnetic thin transfer drum 2 of a transfer device 1.
The transfer drum 2 is provided with a drum cleaning mechanism 4 including a cleaner tape 5 and a roller 6. In the figure, 7
Is a magnetic bias head, 8 is a master medium, and 9 is a slave medium.

The operation of the transfer apparatus having the above-described configuration will be described. A slave medium 9 (or vice versa) is placed under a master medium 8, and these media 8, 9 are pressed against the transfer drum 2 by a pinch roller 3, When the media 8 and 9 are moved from left to right in the drawing while applying a transfer magnetic field by the magnetic bias head 7, the recording signal of the master medium 8 is transferred to the slave medium 9.

During this time, the cleaner tape 5 is attached to the transfer drum 2
And removes magnetic powder, dust and the like adhering to the surface of the transfer drum 2 by the frictional action and the adsorption action.

The cleaner tape 5 of the drum cleaning mechanism 4 is suitably a clean paper tape or a cloth tape formed by knitting chemical fibers having a fine diameter.

FIG. 3 is an error rate diagram of the slave medium after the transfer apparatus according to the present invention has been used for a predetermined time. In the conventional example (FIG. 10) having no cleaning mechanism, the average error rate is 5.42 × 10 ^-3. However, in the example, it was significantly improved to 0.6 × 10 ⁻³ (6.0 × 10 ⁻⁴ ).

FIG. 4 is a diagram showing a second embodiment of the drum cleaning mechanism according to the present invention. In the first embodiment (FIG. 2), a grounded conductive brush 10 is attached to the transfer drum 2, and Is brought into contact with the surface of The description of the same configuration in the modified embodiments after the second embodiment will be omitted. Since the transfer drum 2 is a non-conductive material, there is a possibility that static electricity may be charged by polishing the transfer drum 2 with the cleaner tape 5. Then, the charge is removed by the brush 10 and the transfer drum 2 is removed.
Prevents magnetic powder from adhering.

FIG. 5 is a diagram showing a third embodiment of a drum cleaning mechanism according to the present invention. This transfer apparatus is called a pneumatic magnetic transfer system, in which a transfer drum 11 is provided with a drum cleaning mechanism 4 and a master is provided. The medium 8 and the slave medium 9 are wound around the transfer drum 11 in FIG.
Is the same as

A high pressure air chamber 12 surrounding the magnetic bias head 7 is provided above the transfer drum 11, and the media 8, 9 are pressed against the transfer drum 11 by air pressure discharged from the high pressure air chamber 12.

FIG. 6 is a diagram showing a fourth embodiment of the drum cleaning mechanism according to the present invention. This transfer apparatus is called a pneumatic thermal transfer type, in which a window 14 of a high-pressure air chamber 13 passes through a window 14 from top to bottom. Irradiation is performed, and transfer is performed with the energy of this laser.

FIG. 7 is a diagram showing a fifth embodiment of the drum cleaning mechanism according to the present invention. The drum cleaning mechanism 17 of this embodiment replaces the cleaner tape type drum cleaning mechanism 4 of the third embodiment (FIG. 5). Ejects clean high-pressure air from the purge nozzle 18, and the transfer drum 11
Blow clean the surface.

Preferably, a vacuum exhaust pipe 19 is provided, and the blown magnetic powder and dust are forcibly discharged.

FIG. 8 is a view showing a sixth embodiment of the drum cleaning mechanism according to the present invention. In place of the cleaner tape type drum cleaning mechanism 4 of the first embodiment (FIG. 2), the drum cleaning mechanism of the sixth embodiment is shown. Reference numeral 20 denotes an air chamber 21 which substantially surrounds the transfer drum 2 and blows clean air from below. The air is blown out from a gap between the upper end of the air chamber 21 and the transfer roller 2 to form an air film and flow down the lower surface of the slave medium 9 (arrow). The transfer roller 2 is air-cleaned in the air chamber 21.

Although the embodiments of the drum cleaning mechanism have been described in the first to sixth embodiments, it is possible to combine them in a combined manner.

[0029]

As described above, according to the present invention, since the surface roughness Ra of the surface of the transfer drum is set to 0.08 μm or less, the transfer characteristics are greatly improved.

By cleaning the surface of the transfer drum with the drum cleaning mechanism, good transfer characteristics can be maintained.

Therefore, in a transfer device which employs a transfer drum having a surface roughness Ra of 0.08 μm or less and is provided with a drum cleaning mechanism, extremely excellent transfer characteristics can be maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is an error rate diagram of a slave medium in a transfer device according to the present invention.

FIG. 2 is a diagram showing a first embodiment of a drum cleaning mechanism according to the present invention;

FIG. 3 is an error rate diagram of a slave medium after a transfer device according to the present invention has been used for a certain period of time.

FIG. 4 is a diagram showing a second embodiment of the drum cleaning mechanism according to the present invention;

FIG. 5 is a diagram showing a third embodiment of the drum cleaning mechanism according to the present invention.

FIG. 6 is a diagram showing a fourth embodiment of the drum cleaning mechanism according to the present invention;

FIG. 7 is a diagram showing a fifth embodiment of the drum cleaning mechanism according to the present invention;

FIG. 8 is a diagram showing a sixth embodiment of the drum cleaning mechanism according to the present invention.

FIG. 9 is an error rate diagram of a slave medium in a conventional transfer device.

FIG. 10 is an error rate diagram of a slave medium after using a conventional transfer device for a certain period of time.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transfer apparatus, 2,11 ... Transfer drum, 3 ... Pinch roller, 4,17,20 ... Drum cleaning mechanism, 5 ... Cleaner tape, 6 ... Roller, 8 ... Master medium, 9 ... Slave medium.

Claims (3)

(57) [Claims] 1. A recording signal of a master medium is transferred to a slave medium by pressing a magnetic surface of a master medium on which recording has been performed and a slave medium which is a transfer-receiving medium with each other and applying a transfer bias magnetic field or heat. In the transfer device, the transfer device includes a transfer drum at a pressure contact portion, and the surface roughness Ra of the surface of the transfer drum is 0.08 μm or less. 2. A recording signal of a master medium is transferred to a slave medium by applying pressure to a magnetic field for transfer or applying a transfer bias magnetic field to a recorded master medium and a slave medium which is a medium to be transferred by pressing their magnetic surfaces together. In the transfer device, the transfer device includes a transfer drum at a pressure contact portion and a drum cleaning mechanism for cleaning a surface of the transfer drum. 3. The transfer device according to claim 2, wherein the surface roughness Ra of the surface of the transfer drum is 0.08 μm or less.