JPS647479Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a capstan bearing device for a cassette tape recorder.

Conventional structure and problems In recent years, compact cassettes and smaller cassettes have been required to be ultra-compact and ultra-thin for convenient portability. In addition to making the device thinner, various improvements have been made to the mechanism. On the other hand, in terms of power consumption, improvements have been made to the mechanism, particularly in order to extend battery life and reduce current consumption. One of these is the capstan bearing structure. As is well known, most capstan bearings are of the cantilever type, and this means that a large moment due to the pressure of the pinch rollers is applied to a portion of the bearing, resulting in a large frictional force in that portion, which causes the capstan to drive. Therefore, a large torque is required, which increases power consumption, leading to an increase in the size of the battery or a shortened battery life.

On the other hand, in order to overcome the above-mentioned drawbacks, some methods have adopted a method in which the capstan is held on both sides. In other words, the capstan is supported by bearings at two places, upper and lower, and a pinch roller is pressed to the middle part of the bearings, so that the pinch roller pressing force is distributed vertically. In this case, the capstan's bearing and the housing that supports this bearing are also covered with tape. Since the housing must be inserted into the capstan insertion hole of the cassette, the overall size of the housing has to be extremely small, causing problems in accuracy and strength, as well as problems in assembly, cleaning, and repair.

Purpose of the Invention The present invention provides a capstan bearing device of the double-sided type, which can be constructed compactly and accurately, and which is easy to assemble, and also easy to clean and repair.

Structure of the invention The present invention provides an engaging portion on the side surface of a radial bearing that supports the tip of the capstan, and a locking portion on the rear surface, while the engaging portion is provided on the side surface of the upper end of the capstan housing. The radial bearing is provided with an engaging portion that engages with the aforementioned engaging portion, and a locking portion that engages with the aforementioned engaging portion is provided on the rear surface portion, and the radial bearing is engaged with the upper end portion of the housing, and both the engaging portions are engaged with the upper end portion of the housing. This is a capstan bearing device that is fixed by locking.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a small tape cassette, with reference numeral 1 a cassette main body, 2 a magnetic tape wound around reel hubs 3 and 4, and 5 a capstan insertion hole into which a capstan is inserted.

Next, in Figure 2, 6 is a capstan, 7 is a capstan, and 7 is a capstan.
is a capstan housing made of brass or aluminum die-casting, and a lower radial bearing 8 made of oil-less metal or the like is provided at the base of the capstan housing. 9 is an upper radial bearing made of synthetic resin with wear resistance and lubricity, and on its upper surface,
A mountain-shaped taper 10 is formed, and the lower part has a press-fitting part 11 that is press-fitted into the upper part of the capstan housing 7, and a locking pawl 12 is integrally formed on the rear surface of the press-fitting part 11. has been done. Also,
Engagement recesses 13 are formed on both side surfaces of the upper radial bearing 9. On the other hand, an engaging protrusion 14 that can be engaged with the engaging recess 13 of the upper radial bearing 9 is provided on the side surface of the upper end of the capstan housing 7.
are integrally formed, and a locking hole 15 into which the locking pawl 12 is locked is formed on the rear surface.

With the above configuration, the press-fitting part 11 of the upper radial bearing 9 is press-fitted into the upper end of the capstan housing 7, and the engagement recess 13 of the upper radial bearing 9 is engaged with the engagement protrusion 14. , and the locking claw 12 is locked in the locking hole 15. As a result, the upper radial bearing 9 is attached to the upper end of the capstan housing 7, and its rotation is prevented by the engagement recess 1.
3 and the engaging protrusion 14, and the locking pawl 12 and the locking hole 15 prevent the locking from coming off.
Therefore, the capstan 6 is supported at its lower part by a lower radial bearing 8 and at its upper part by an upper radial bearing 9.

According to the above-described structure, the upper radial bearing 9 is fixed to the capstan housing 7 in a state in which it does not rotate or come off, so it is possible to easily obtain a high-precision double-sided type capstan bearing device. The capstan housing 7 can be removed by pulling it out upward while releasing the locking pawl 12 of the upper radial bearing 9 from the locking recess 15.
Since it can be removed from the body, cleaning and repair are easy.

Effects of the invention As described above, the present invention has an upper radial bearing which is fixed to the upper end of the capstan housing which has a lower radial bearing at the base, with the engaging part preventing it from rotating, and the engaging part press-fitting it into place so that it does not come off. in,
According to this method, a compact, high-precision double-sided type capstan bearing device is obtained, which is easy to assemble, and cleaning and repair are also easy by removing the upper radial bearing from the capstan housing. is large.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a small tape cassette, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the same. DESCRIPTION OF SYMBOLS 1... Tape cassette, 5... Capstan insertion hole, 6... Capstan, 7... Capstan housing, 8... Lower radial bearing, 9... Upper radial bearing, 11... Press-fitting part, 12... Connection Retaining pawl, 13... Engaging recess, 14... Retaining protrusion, 15
...Lock hole.

Claims (1)

[Scope of utility model registration request] A capstan bearing in which a capstan for running a tape at a constant speed and a capstan housing having a radial bearing that supports the capstan at two places, the base and the tip, are both inserted into a capstan insertion hole of a tape cassette. In the device, an engaging portion is provided on both side surfaces of a radial bearing that supports the tip of the capstan, and a locking portion is provided on the rear surface, while the engaging portion of the radial bearing is provided on a side surface of the upper end of the capstan housing. An engaging portion that engages with the mating portion and a locking portion that locks with the locking portion provided on the rear surface of the radial bearing are provided, and the radial bearing is attached to the upper end of the capstan housing. A capstan bearing device in which the mating portions are engaged and both locking portions are locked and fixed.