JPS5834617Y2 - magnetic tape cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a magnetic tape cartridge, and an object of the present invention is to provide a magnetic tape cartridge in which the running state of the magnetic tape is stable.

As shown in FIG. 1, the magnetic tape cartridge has a round shape in which a supply reel 3 and a take-up reel 4, which rotate the magnetic tape 2 clockwise, are rotatably attached to the center of a cartridge case 1.
On the front side of the cartridge case 1 is the Gytro-ra 5.
is installed.

and,. The magnetic tape 2 fed out from the supply reel 3 is guided to the front side of the cartridge case 1 by a guide roller 5, and is wound onto a take-up reel 4.

The guide roller 5 guides the magnetic tape 2 and facilitates its running. It is made of synthetic resin such as polyacetal resin, and has a smooth outer surface in contact with the magnetic tape 2, and has a smooth outer surface that is in contact with the magnetic tape 2 and the guide roller. Since the contact area of the roller 5 is small, slippage may occur between the running magnetic tape 2 and the guide roller 5.

As a result, the running speed of the magnetic tape 20 becomes uneven, causing problems in recording and playback.

The present invention eliminates these drawbacks, and an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

The guide rollers 11a and 11b are molded from synthetic resin such as polyacetal resin as in the prior art, and are rotatably mounted by pins 13 protruding from the cartridge case 12.

At least two guide rollers 11a and 11b are arranged close to each other along the running direction of the magnetic tape 14.

A ring body 15 made of rubber, cloth, etc. is installed on the outer peripheral surface of the guide rollers 11a and 11b.
5 rotates together with guide rollers 11a and llb.

Of the guide rollers 11a and 11b, the outer four guide rollers 11a are arranged slightly behind the inner guide roller 11b, and the annular body 15 is moved against the front surface of the cartridge case 12 by the deviation of the guide rollers 11a and 1ib. It is in a slightly sloping state.

The magnetic tape 14 fed out from the supply reel 16 travels while being guided while contacting the side surface of the ring body 15, and is wound onto the take-up reel 17.

As the magnetic tape 14 runs, the ring body 15 rotates along the outer circumferential direction of the guide rollers 11a and 11b, and the guide rollers 11a and 11b rotate around the pins 13 and 13.

In the case of FIG. 2, the guide rollers 11a and 11b are arranged on the front side of the cartridge case 12, but as shown in FIG.
In this case, the guide roller 11b closer to the front of the cartridge case 12 is slightly deviated inward than the rear guide roller 11a.

By deflecting the guide rollers 11a and 11b in this manner, the contact state between the magnetic tape 14 and the ring body 15 is improved.

The present invention has such a structure, and since the magnetic tape comes into contact with the ring body installed between the plurality of guide rollers over a wide area, the slip that occurs between the guide rollers and the magnetic tape is eliminated. Therefore, the running speed of the magnetic tape becomes constant, and a magnetic tape cartridge with stable recording and playback characteristics can be obtained.

In particular, the rubber ring has a good anti-slip effect, and its elasticity allows it to fit tightly into the guide roller.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of a conventional magnetic tape cartridge, FIG. 2 is a partially cutaway plan view of a magnetic tape cartridge according to the present invention, and FIG. 3 is a sectional view of essential parts of a modified example. be. 11a, 11b... Guide roller, 14... Magnetic tape, 15... Ring body.

Claims (1)

[Scope of utility model registration request] A plurality of guide rollers are arranged close to each other so as to be freely rotatable, and a ring body is installed between the outer peripheral surfaces of these guide rollers, and a running magnetic tape is brought into contact with the side surface of the ring body, and the magnetic tape is A magnetic tape cartridge characterized in that an annular body and each guide roller are rotated as the tape runs.