JPH0345350Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tape cassette used in a video tape recorder or the like, and more specifically, to a tape cassette equipped with a tape guide.

(Prior art) Regarding this type of conventional tape cassette, the second
This will be explained with reference to the drawings and FIG.

Figure 2 shows a VHS tape cassette, which consists of an upper case 1, a lower case 2, and two tape guides 4 that determine the running position of the magnetic tape 3.
This part and other parts (not shown) are fastened together using machine screws. FIG. 3 is a partial sectional view including the tape guide 4 of the tape cassette.
The upper case 1 is guided by a small gap and a long mating surface to ensure accurate positioning and perpendicularity.
The boss 1a formed in the bottom case is inserted with a large gap, and the boss 2a
It is fixed between the upper and lower cases 1 and 2 by a machine screw 5 that is screwed into a screw hole provided at the center of the boss 1a of the upper case 1 through a through hole provided at the center of the upper case 1.

(Problem that the invention attempts to solve) However, in the above configuration, the boss 2
In order to correctly align and fix the tape guide 4 fitted to the boss 2a, a long fitting surface is required, so the boss 1a of the upper case 1 is shortened, and therefore the machine screw The problem is that the effective fitting length A between the small screw 5 and the screw hole of the boss 1a cannot be made sufficiently long, and therefore the maximum tightening torque of the machine screw 5 cannot be increased, and the screw hole is likely to collapse due to over-tightening. It was hot.

The present invention solves the above problems and provides a tape cassette with a large maximum tightening torque while maintaining the perpendicularity of the tape guide.

(Means for Solving the Problems) In order to solve the above problems, the present invention regulates the perpendicularity of the tape guide 4 and makes the screw hole into which the machine screw 5 fits into the boss 1a of the upper case 1. The person in charge of the project is to be in charge.

(Function) With this configuration, the boss 1a of the upper case 1 can be made sufficiently long, so that the effective fitting length for fitting with the machine screw 5 can also be made long.

(Example) An example of the present invention will be described with reference to FIG. The figure shows the tape guide 4 of the tape cassette according to the present invention.
This is a cross-sectional view of the main parts, including the same symbols as in the conventional example for the same components. The tape guide 4 according to the present invention is guided by the boss 1a formed on the upper case 1, a small gap, and a long fitting surface to ensure accurate position and perpendicularity. , the boss 2a that fits with a large gap is inserted, and the boss 1a of the upper case 1 is inserted through the through hole provided at the center of the boss 2a from the surface of the lower case 2.
It is fixed between the upper and lower cases 1 and 2 by a machine screw 5 screwed into a screw hole provided at the center of the case.

The inner diameter surface of the tape guide 4 and the boss 2 of the lower case 2
The large gap provided between the outer diameter surface of a and the inner diameter surface of the tape guide 4 is to accommodate manufacturing tolerances of the bosses 1a and 2a of both the upper and lower cases 1 and 2. Boss 1a of upper case 1
It has the same purpose as the large gap provided between the outer diameter surface of the

With this configuration, the lower case 2
Since the boss 2a is only used as a direction guide when assembling the upper and lower cases 1 and 2, its length can be made shorter than the conventional length that requires perpendicularity; The length of the boss 1a of the upper case 1 becomes longer. Comparing this embodiment and the conventional example, we can see that in this embodiment the fitting length between the tape guide 4 and the boss 1a of the upper case 1, that is, the length b shown in FIG. 1, is different from that in the conventional example. The length of the engagement with the boss 2a of the case 2 is approximately 10% longer than the length B shown in FIG. , the length a of this embodiment shown in FIG. 1 is approximately 40% longer than the length A of the embodiment shown in FIG.

(Effects of the invention) As explained above, according to the invention, not only can the effective mating length of machine screws be significantly extended without impairing the perpendicularity of the tape guide, but also
By increasing the outer diameter of the boss that forms the screw hole, it is possible to prevent the boss from cracking during tightening, improve the maximum tightening torque, and prevent accidents such as screw hole collapse.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of the tape guide area of a tape cassette according to the present invention, FIG. 2 is a perspective view of the tape cassette, and FIG. 3 is an enlarged sectional view of the tape guide area of a conventional tape cassette. 1... Upper case, 1a, 2a... Boss, 2... Lower case, 3... Magnetic tape, 4... Tape guide, 5... Machine screw.

Claims (1)

[Scope of utility model registration request] An upper case has an outer diameter surface into which the tubular tape guide fits with a small gap and a boss having a screw hole in the center thereof, and an outer diameter surface with a large gap into which the above-mentioned tape guide fits and the upper case. A tape cassette comprising a lower case in which a boss is formed in the center and has a through hole through which a small screw to be tightened into the screw hole is inserted, and the boss of the upper case is longer than the boss of the lower case.