JPS6232389Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents lubricating oil such as grease present in the gap between the inner circumference of the guide roller and the outer circumference of the support shaft from adhering to the lower edge of the magnetic tape. An object of the present invention is to provide a magnetic tape cartridge that does not damage the lower edge of the magnetic tape.

In a magnetic tape cartridge, the magnetic tape runs in sliding contact with a guide roller and a guide pin.However, conventionally, as shown in FIG. 3, a synthetic resin guide roller 22 and a metal guide pin 23 are used. Since the upright base surfaces 26 of the supporting shafts 24 and 25 that are fitted are flush with each other, and the lower end of the magnetic tape 28 and the base surface 26 are close to each other,
When lubricating oil 27 such as grease present in the gap between guide roller 22 and support shaft 24 leaks onto base surface 26, it contaminates magnetic tape 28 and impairs proper recording and reproduction.

In addition, the cylindrical guide roller 22 made of synthetic resin is
During the molding process, as the end surface of the guide roller of the molded product is pushed out by the ejector pin, deformation occurs in the vicinity of the upper and lower end surfaces of the cylindrical guide roller 22 after molding, and the upper and lower ends of the tape guide surface of the guide roller become so-called rough surfaces. If the magnetic tape comes into sliding contact with this area, not only will the tape run become unstable, but if the deformation is large, this rough surface will damage the tape end surface, especially for magnetic tapes such as video tapes. This tends to cause the problem that the vertical movement of the tape running at either the upper or lower ends cannot be sufficiently regulated.

This invention solves the above-mentioned drawbacks, and provides a magnetic tape cartridge that prevents oil from adhering to the magnetic tape, and that enables accurate recording and playback by appropriately guiding the tape using guide rollers. purpose.

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 1, 11 is a reel inserted into the lower case 12 of the cartridge case main body.
Reference numeral 13 indicates a magnetic tape wound around the reel 11. This magnetic tape 13 includes, for example, a guide roller 14 made of synthetic resin and a guide pin 15 made of metal.
The vehicle is designed to run in sliding contact with the vehicle.

The guide roller 14 and guide pin 15 are the second
As shown in the figure, each is fitted onto support shafts 16 and 17. These spindles 16 and 17 are erected on the base 18 of the lower case 12, and the erected base surface 19 of the spindle 16 into which the guide roller 14 is fitted
is formed lower than the erected base surface 20 of the support shaft 17 into which the guide pin 15 is fitted by a step h, and the lower end of the tape guide surface of the guide roller 14 is set lower than the erected base surface 20. has been done.

In the figure, reference numeral 21 denotes lubricating oil such as grease that is present in the gap between the inner circumference of the guide roller 14 and the outer circumference of the support shaft 16.

In the above configuration, the lubricating oil 2 interposed in the gap between the inner circumference of the guide roller 14 and the outer circumference of the support shaft 16
1 leaks onto the base surface 19 as the guide roller 14 rotates, but since this base surface 19 is formed lower than the base surface 20 on the guide pin 15 side by the step h, The lubricating oil 21 leached onto the base surface 20 does not migrate onto the base surface 20, and the magnetic tape 13
Since there is no sliding contact with the upper and lower ends of the tape guide surface 2, the tape ends are not damaged and accurate recording and playback is possible.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a cartridge lower case equipped with this invention, FIG. 2 is an enlarged sectional view taken along the line 2--2 in FIG. 1, and FIG. 3 is an enlarged sectional view of a conventional example. 12...Lower case, 14...Guide roller, 15
... Guide pin, 16, 17 ... Support shaft, 18 ...
Base, 19, 20...Base surface, h...Step.

Claims (1)

[Scope of utility model registration request] The upright base surface 19 of the support shaft 16 to which the cylindrical guide roller 14 made of synthetic resin is fitted is lower than the upright base surface 20 of the support shaft 17 to which the guide pin 15 is fitted by providing a step h. The lower end of the tape guide surface of the guide roller 14 is formed on the base surface 18 of the lower case 12, and the lower end of the tape guide surface of the guide roller 14 is formed on the upright base surface 2 of the support shaft 17.
1. A magnetic tape cartridge characterized in that the magnetic tape cartridge is configured to be lower than 0, and lubricating oil is interposed in the gap between a cylindrical guide roller 14 and a support shaft 16.