JPS61145753A - Rotary cylinder device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the driving load of a magnetic tape and to improve the tape driving stability by providing a projection on the tape driving surface of a fixed cylinder to secure contact with the tape. CONSTITUTION:A magnetic tape 1 touches a projection 7 when it is driven on a fixed cylinder 3, and a fixed distance is secured between the tape 1 and the tape driving surface 4 of the cylinder 3. Thus frictional resistance is reduced between the tape 1 and the cylinder 3. This improves the higher driving stability of the tape 1. This is due to a fact that an air layer is produced between the tape 1 and a rotary cylinder 2 by the revolution of the cylinder 2. Then the air flows into a gap produced by a contact between the tape 1 and the projection 7 of the cylinder 3 and by the revolution of the cylinder 2. Then an air layer can also be formed between the tape 1 and the surface 4 of the cylinder 3.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotating cylinder device for a magnetic recording and reproducing device.
In particular, the present invention relates to a rotating cylinder device that reduces the frictional resistance of the magnetic tape against the tape running surface by forming an air layer between the tape running surface on the side surface of a fixed cylinder and the magnetic tape.

[Background of the invention]

In a rotating cylinder device of a magnetic recording and reproducing device, for example, a method of reducing the frictional resistance of the magnetic tape on the side surface of a fixed cylinder by forming an air layer between the tape running surface on the side surface of the fixed cylinder and the magnetic tape is as follows. As shown in Japanese Unexamined Patent Publication No. 58-45654, one end edge of the tape is set at a position away from the side surface facing the tape, which is the guide stepped portion of the fixed cylinder that comes into contact with it.

However, since this method positions the tape in the cylinder radial direction by making the lead part of the fixed cylinder U-shaped, the distance between the magnetic tape and the fixed cylinder is not reliably defined, so the tape tension Due to the change in the radial position of the tape, the reproducibility of the tape running position may be impaired.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned disadvantages of the prior art in a magnetic recording/reproducing device. Specifically, by forming an air layer between a fixed cylinder and a magnetic tape, The object of the present invention is to realize a magnetic recording and reproducing device that reduces the frictional resistance of the side surface of a fixed cylinder against a tape running surface, maintains a constant distance between the fixed cylinder and a magnetic tape, and achieves stable tape running.

[Summary of the invention]

This invention creates an air layer between the cylinder and the magnetic tape as a measure to reduce the frictional resistance on the side surface of the fixed cylinder of the magnetic tape against the tape running surface.

By focusing on the formation of a magnetic tape, a protrusion is provided along the lead part on a part of the tape running surface on the side of the fixed cylinder, and the magnetic tape runs in contact with the protrusion, thereby stabilizing the gap between the cylinder and the magnetic tape. This reduces the frictional resistance of the fixed cylinder side surface of the magnetic tape against the tape running surface.

[Embodiments of the invention]

The present invention will be explained below by way of examples.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of the embodiment of the present invention.

FIG. 5 is a cross-sectional view of another embodiment of the invention, and FIG. 4 is a perspective view as well.

1 is the magnetic tape, 2 is the rotating cylinder, 5 is the fixed cylinder, 4 is the tape running surface of the fixed cylinder, 5 is the magnetic head%
Reference numeral 6 denotes a lead for guiding the magnetic tape 1 on the fixed cylinder s, and 7 a protrusion that comes into contact with the magnetic tape 1 and keeps the distance between the magnetic tape and the fixed cylinder 5 constant.

The magnetic tape 1 is attached to the lead 6 on the fixed cylinder s.
While one end is brought into contact with and its traveling position is regulated,
It travels while being wound around the rotating cylinder 2 and the fixed cylinder 5 at a predetermined angle.

and to the magnetic field 9 mounted on the rotating cylinder 2.
A video or audio signal is recorded on the magnetic tape 1 by the card 5. The magnetic tape 1 is attached to the fixed cylinder 5
Since the protrusion 7 comes into contact with the magnetic tape 1 when running on the magnetic tape 1, the distance between the magnetic tape 1 and the tape running surface 4 of the fixed cylinder is kept constant, and the magnetic tape 1 comes into contact with the fixed cylinder 3. It is possible to reduce the frictional resistance caused by the magnetic tape 10 and stabilize the running of the magnetic tape 10. This is because an air layer is formed between the magnetic tape 1 and the rotating cylinder 2 by the rotation of the rotating cylinder 2, and when the magnetic tape 1 comes into contact with the protrusion 7 installed on the fixed cylinder 5, the gap formed by K. Air flows in as the rotary cylinder 2 rotates, and an air layer can also be formed between the magnetic tape 1 and the running surface 4 of the fixed rotary cylinder.

This is particularly effective when running a tape with high frictional resistance, such as a vapor-deposited tape.

The cross-sectional shape of the lead 6 is designed to accurately position the magnetic tape 1 in the fixed cylinder 6 in the radial direction when the end surfaces 1-2 of the magnetic tape 1 come into contact with each other, as shown in FIG. In order to stabilize running on the cylinder 3, it is also possible to form a U-shaped concave shape.

Furthermore, by forming the protrusions 7 intermittently as shown in FIG. 4, the contact area with the magnetic tape 1 can be reduced, and it is also possible to realize even lower load running on the fixed cylinder s. .

〔Effect of the invention〕

According to the present invention, the magnetic tape comes into contact with the protrusion provided on the tape running surface of the fixed cylinder, thereby creating a gap between the magnetic tape and the fixed cylinder, and reducing the running load caused by direct contact between the magnetic tape and the fixed cylinder. This makes it possible to further stabilize tape running.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a rotating cylinder device according to an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment of the present invention,
FIG. 5 is a side sectional view of a rotary cylinder device according to another embodiment of the invention, and FIG. 4 is a perspective view of another embodiment of the invention. 1... Magnetic tape, 2... Rotating cylinder, 3...
Fixed cylinder, 4...Tape running surface, 6...Lead, 1゛:+NO

Claims (1)

[Claims] 1. A fixed cylinder having a guide step for the magnetic tape on its side surface and a tape running surface on which the magnetic tape comes into contact, and a rotating cylinder on which a magnetic head is mounted, one end edge of the magnetic tape being brought into contact with the guide step. , a rotating cylinder device in which the magnetic tape is mounted on the fixed cylinder and the rotating cylinder at a predetermined angle and runs, the magnetic recording characterized in that the running surface of the fixed cylinder is provided with a protrusion on which the magnetic tape comes into contact. Rotating cylinder device for regeneration equipment.