JPH0454626Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to magnetic tape cassettes such as audio cassette tapes and video cassette tapes.

[Conventional technology]

For example, in the case of a video cassette tape, a reel wound with magnetic tape is housed in a cassette body consisting of an upper half and a lower half made of synthetic resin, and the magnetic tape is inserted into the cassette body through the front opening of the cassette body. In order to guide the running of the magnetic tape, a guide pole is provided inside the cassette body, and a guide roller is rotatably fitted onto the guide pole.

This guide pole is formed separately from metal and is installed upright on the inner surface of the upper half or lower half made of synthetic resin by means such as driving.
When molding an upper half or a lower half made of synthetic resin, some are formed integrally with the inner surface of the upper half or lower half.

By the way, in order to ensure smooth rotation, the guide roller is fitted onto the guide pole after applying lubricating oil such as grease to the guide pole. Because of the diameter, lubricating oil sometimes leaked and adhered to the tape during installation.

For this reason, as disclosed in Japanese Utility Model Application Publication No. 58-155686, there is a metal guide pole in which an oil reservoir is formed along the entire length of the guide pole, and a slit that communicates with the oil reservoir is formed. .

[Problem that the invention attempts to solve]

However, since these guide poles are made of metal and are formed separately, they are costly and require a driving process.Furthermore, because they have high thermal conductivity, the lubricating oil in the oil reservoir may deteriorate depending on the external environment. There is a risk that the supply status of

Therefore, the present invention is advantageous in terms of cost, eliminates the need for a driving process, is less likely to change the lubricating oil supply state in the oil reservoir due to the external environment, prevents lubricating oil from adhering to the tape, and furthermore The object of the present invention is to provide a magnetic tape cassette which is strong and has a mold for forming an oil reservoir and a slit which has excellent durability.

[Means for solving problems]

To achieve the above object, the present invention provides a magnetic tape cassette in which a guide pole for rotatably fitting a guide roller for guiding a magnetic tape is integrally formed on the inner surface of an upper half or a lower half made of synthetic resin. It is characterized in that an oil reservoir is formed extending from the tip of the pole to the center in the longitudinal direction, and a slit communicating with the oil reservoir is formed along the entire length of the oil reservoir.

〔Example〕

A first embodiment in which the present invention is applied to a video tape cassette will be described below with reference to FIGS. 1 to 3.

A video tape cassette 1 houses reels 5 and 6 on which magnetic tape 4 is wound inside a cassette body composed of an upper half 2 and a lower half 3 made of synthetic resin, and a front opening 7 of the cassette body. ，
The magnetic tape 4 is wound around the front surface of the cassette body from 8 to 8. In order to guide the running of the video tape 4, guide poles 9, 9 are provided upright inside the cassette body, and guide rollers are attached to the guide poles 9, 9, respectively. 10, 10 are rotatably fitted on the outside, and tape guides 11, 10 are fitted in the openings 7, 8, respectively.
11 is provided, and the magnetic tape 4 is brought into contact with guide rollers 10, 10 and tape guides 11, 11 to guide the running of the magnetic tape 4.

As shown in FIG. 2, the guide pole 9 is formed integrally with the inner surface of the lower half 3 when it is molded.

Further, when molding the guide pole 9, an oil reservoir 12 is formed in the upper half, that is, from the tip of the guide pole 9 to the center in the longitudinal direction, and a slit 13 communicating with the oil reservoir 12 is formed with an oil reservoir 12. The reservoir portion 12 is formed over the entire length thereof.

Next, FIG. 4 shows a second embodiment, in which a guide pole 9 is integrally formed on the inner surface of the upper half 2 when the upper half 2 is molded. That is, an oil reservoir 12 is formed extending from the tip of the guide pole 9 to the central portion in the longitudinal direction, and a slit 1 communicating with the oil reservoir 9 is formed.
3 is formed along the entire length of the oil reservoir portion 12.

By configuring both embodiments in this way,
Since the lubricating oil such as grease applied to the guide pole 9 oozes out from the oil reservoir 12 through the slit 13, the lubricating oil does not leak out when the guide roller 10 is fitted onto the outside.

Furthermore, since the guide pole 9 is integrally formed with the oil reservoir 12 and the slit 13 when molding the upper half 2 or the lower half 3, it is cost-effective compared to metal guide poles, and the driving process is becomes unnecessary.

Moreover, since the guide pole 9 is made of synthetic resin, its thermal conductivity is low, and the state of supply of lubricating oil in the oil reservoir is unlikely to change depending on the external environment.

Furthermore, since the oil reservoir 12 and the slit 13 are formed in half of the guide pole 9 in the longitudinal direction, the guide pole 9 is stronger than one formed in the entire length.

Furthermore, since the mold for forming the oil reservoir and slit is thin, forming the oil reservoir and the slit over the entire length of the guide pole 9 will be weak in strength and have poor durability. 13 is formed in half of the guide pole 9 in the longitudinal direction,
Excellent durability.

[Effect of idea]

As described above, the present invention forms an oil reservoir from the tip of the guide pole integrally formed on the inner surface of the upper half or lower half made of synthetic resin to the central part in the longitudinal direction, and communicates with the oil reservoir. A slit is formed along the entire length of the oil reservoir, which is cost-effective compared to metal guide poles, and eliminates the need for a driving process.Furthermore, since the guide poles are made of synthetic resin, they have low thermal conductivity. The lubricating oil supply condition in the oil reservoir is unlikely to change due to the external environment, and the lubricating oil applied to the guide pole will not leak out when the guide roller is externally fitted, and the lubricating oil will not be transferred to the tape. In addition, since an oil sump and slit are formed in half of the length of the guide pole, the guide pole is stronger than one that is formed over the entire length. Since the mold is thin, forming an oil sump and slit along the entire length of the guide pole will result in weaker strength and less durability. Because of this, it has excellent durability.

[Brief explanation of drawings]

Figures 1 to 3 show a first embodiment of the present invention, with Figure 1 being a plan view showing the top half of the videotape cassette removed, and Figure 2 showing the relationship between the guide pole and guide roller. FIG. 3 is a cross-sectional view taken along the line shown in FIG. 2, and FIG. 4 is a cross-sectional view showing the second embodiment. 1... Video tape cassette, 2... Upper half, 3... Lower half, 4... Magnetic tape, 5, 6
... Reel, 9 ... Guide pole, 10 ... Guide roller, 12 ... Oil reservoir, 13 ... Slit.

Claims (1)

[Scope of utility model registration request] A guide roller 1 that guides the magnetic tape 4 is provided on the inner surface of the upper half 2 or lower half 3 made of synthetic resin.
In a magnetic tape cassette integrally formed with a guide pole 9 into which a magnetic tape 0 is rotatably fitted, an oil reservoir 12 is formed extending from the tip of the guide pole 9 to the center in the longitudinal direction. A magnetic tape characterized in that a communicating slit 13 is formed along the entire length of an oil reservoir portion 12.