JPH06187707A - Cylinder device - Google Patents

Abstract

PURPOSE:To provide a cylinder device capable of lowering friction resistance at the time of traveling of a magnetic tape and drastically decreasing the wear of the magnetic tape and cylinder for a VTR for which the cylinder device made of a plastic is used. CONSTITUTION:This cylinder device 10 is formed of a plastic resin 60 compounded with a filler 70. This filler 70 is constituted of a material higher in at least either hardness or sliding characteristic than the plastic resin 60. The cylinder device 10 is so formed as to expose the filler 70 on the cylinder surface 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder device of a magnetic recording / reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR) or a digital audio tape recorder (hereinafter referred to as DAT).

[0002]

2. Description of the Related Art Generally, a cylinder device used in a magnetic recording / reproducing device such as a VTR is composed of a lower fixed cylinder and a rotary cylinder coaxially attached to the lower fixed cylinder, as is well known in the case of a helical scan system. There is. A magnetic head, which is provided on a rotary cylinder, records and reproduces a signal on a magnetic tape that slides helically on the peripheral surfaces of these cylinders.

As described above, the magnetic tape slides helically on the peripheral surface of the rotating cylinder, and the magnetic tape is mounted on the cylinder.
Since the vehicle is wound around 0 ° and travels, frictional resistance is generated between the magnetic tape and the cylinder, which greatly affects the rotational speed of the rotary head. Therefore, it is important for this type of cylinder device to reduce the frictional resistance.

On the other hand, aluminum alloys are often used as conventional cylinder devices for VTRs, for example. Since the surface is required to have low tape running friction and high precision and durability, it is often treated with a thin hard alumite after grinding or untreated. In addition to processing in this way, in addition to the part where the magnetic tape of this cylinder device runs,
The tape was machined in the running direction to reduce the frictional resistance with the tape and prevent winding of the tape or abrasion of the cylinder.

However, when the aluminum alloy is used as the cylinder device as described above, there are problems in that the manufacturing process is complicated and complicated, and the cost is high.

By the way, in recent years, due to the miniaturization of VTRs and the miniaturization of cylinder devices and the increase in the number of channels of video heads accompanying the advancement of performance, the manufacturing process of this cylinder device requires extremely high and complicated processing work. Therefore, in order to meet such demands, it is also necessary to improve the material of the cylinder itself, which is excellent in moldability and durability and is low in cost.

Under such circumstances, for example, a cylinder device made of plastic has been noticed and studied.

However, if plastic resin is used as the material of the cylinder device as described above, complicated processing can be facilitated, for example, using an aluminum alloy, but a VTR equipped with this cylinder device is actually used. When the magnetic tape is started up and run, the frictional resistance between the magnetic tape and the cylinder increases, which causes the magnetic tape or the cylinder to wear.

[0009]

When the plastic cylinder device is used as described above, when the magnetic tape is run, the frictional resistance between the magnetic tape and the cylinder increases, and the magnetic tape or the cylinder wears. There was a problem that it would end up.

Therefore, the present invention has been made in view of the above problems. Therefore, even when a plastic cylinder device is used, the friction resistance during running of the magnetic tape is reduced and the wear of the magnetic tape and the cylinder is significantly reduced. An object of the present invention is to provide a cylinder device that can be used.

[0011]

A cylinder device according to the present invention is a cylinder device formed of a plastic resin mixed with a filler, wherein the filler is at least one of hardness and slidability as compared with the plastic resin. It is characterized in that it is formed of a material having a high viscosity and is formed so that the filler is exposed on the surface of the cylinder.

[0012]

In the present invention, by using a filler having a higher hardness and slidability than the plastic resin as the filler to be mixed with the plastic resin, only the plastic resin is abraded by lapping or the like, and the filler is applied to the surface. It can be processed so as to be exposed, and the frictional resistance during tape running can be reduced.

[0013]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 shows an embodiment of the cylinder device according to the present invention.
FIG. 1A is a conceptual diagram showing a concrete configuration of a cylinder device and a magnetic tape running, and FIG. 1B is a partially cutaway cross-sectional view near a cylinder surface when the magnetic tape is running.

In FIG. 1A, reference numeral 10 indicates a cylinder device, and this cylinder device 10 is used in a magnetic recording / reproducing device such as a VTR (not shown). Further, in the case of the helical scan system, for example, this cylinder device 10 has a lower fixed cylinder 10b similar to the conventional example.
And a rotary cylinder 10a coaxially attached thereto. These cylinders 10a, 10
The magnetic tape 40 that slides helically on the peripheral surface of b is such that the lower end of the tape 40 is along the lead 30. A signal is recorded / reproduced on / from the magnetic tape 40 by the magnetic head 20 provided on the rotary cylinder 10a.

A cylinder device 10 having such a configuration is shown in FIG.
As shown in (B), it is formed of a plastic resin 60.
As the plastic resin 60, a resin 60 such as PPS (polyphenylene sulfide) or PBT (polybutylene terephthalate) mixed with a spherical filler 70 such as glass beads is used. These resins are excellent in moldability and durability, have high elastic modulus characteristics, and have good dimensional stability. In addition, this filler 70
Has a property of high slidability, and has the above-mentioned PPS or PB.
A material having higher hardness than the plastic resin 60 such as T is used. Therefore, the surface 50 of the cylinder device 10 molded with the plastic resin 60 is polished by a method such as lapping or etching, as shown in FIG.
As shown in (B), the surface 50 is formed with the filler 70 exposed. Therefore, the magnetic tape 40 that slides helically on the surface 50 comes into contact with the spherical filler 70, reducing frictional resistance and smoothing the tape running.

Next, a method of manufacturing the cylinder device 10 as described above will be described in more detail with reference to FIGS.
2 and 3 show a cylinder device 10 according to the present invention, FIG. 2 is a partially cutaway sectional view of the surface of the cylinder after molding, and FIG. 3 shows the surface of the cylinder of FIG. It is a partially broken cross-sectional view of the surface vicinity at the time of doing. In FIG. 2, for example, as described in FIG. 1, as the material of the cylinder device 10, a plastic resin 60 such as PPS or PBT mixed with a spherical filler 70 such as glass beads is used. By doing so, the cylinder device 10 is formed. Also, this filler 7
0 has high slidability and the PPS
Alternatively, a material having a hardness higher than that of the plastic resin 60 such as PBT is used.

Therefore, as described above, the cylinder device 10
By using the plastic resin 60 as the material, the cylinder device 10 can be molded easily, and also has excellent durability and dimensional stability.

However, as shown in FIG. 2, since the surface 50 of the cylinder device 10 is molded with the plastic resin 60, it is covered with at least the plastic resin 60, and in this case, the spherical filler 70 has the surface 50. It is not exposed on the upper side and is in a state of being housed in the plastic resin 60.

Then, the surface 50 of the cylinder (the surface 50 in FIG. 1) is then lapped.

Since the plastic resin 60 (PPS or PBT resin) has a lower hardness than the glass beads as the filler 70, the plastic resin 60 is selectively ground. That is, even if the amount of the filler 70 having high hardness is small, it is exposed to the surface 50 without being abraded, that is, the glass beads as the filler 70 can be processed so as to float on the surface 50.

By carrying out such a manufacturing method or processing method, the cylinder device 10 of this embodiment can be realized.

In the above embodiment, the helical scan method has been described in the structure of the cylinder device.
The present invention is not limited to this, and may be, for example, a vertically fixed cylinder device that is not rotatable, and can be applied to all cylinder devices.

Furthermore, in the above-mentioned embodiment, it was explained that the filler was mixed with the plastic resin, but the present invention is not limited to this, and for example, the slidability is provided on the outer peripheral portion of the cylinder made of aluminum alloy or plastic resin. Some fillers may be polymerized.

[0024]

As described above, according to the present invention, it is possible to reduce the frictional resistance when the magnetic tape is running, and it is possible to prevent abrasion of the tape and the cylinder.

[Brief description of drawings]

1A and 1B are configuration diagrams showing an embodiment of a cylinder device according to the present invention.

2 to 3 show a method for manufacturing a cylinder device according to the present invention, and FIG. 2 is a partially cutaway cross-sectional view near the surface of a cylinder after molding.

FIG. 3 is a partially cutaway cross-sectional view near the surface of the cylinder when lapping is performed on the surface of the cylinder device of FIG.

[Explanation of symbols]

 10 ... Cylinder device 10a ... Rotating cylinder 10b ... Lower fixed cylinder 20 ... Head 30 ... Lead 40 ... Magnetic tape 50 ... Surface 60 ... Plastic resin 70 ... Filler

Claims (1)

[Claims] 1. A cylinder device in which a plastic resin mixed with a filler is formed on at least an outer peripheral portion, wherein the filler has at least one of hardness and slidability,
A cylinder device, which is made of a material higher than that of the plastic resin, and is formed such that the filler is exposed on the surface of the cylinder.