JPS6349873Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a capstan bearing device in a cassette type magnetic recording/reproducing device.

Conventional configurations and their problems In recent years, compact cassettes and even smaller cassettes have become ultra-compact and portable for convenient portability.
There is a demand for ultra-thin tape recorders, and for this reason, various improvements have been made to the mechanisms of tape recorders as well as making their mechanical parts smaller and thinner. 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 a large moment due to the pressing force of the pinch roller is applied to a portion of the bearing, resulting in a large frictional force in that portion, which is used to drive the capstan. This requires a large torque and consumes a large amount of current, 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 locations, upper and lower, and a pinch roller is pressure-bonded to the intermediate portion of the capstan, thereby dispersing the pressure of the pinch roller vertically.In this case, the capstan's bearing and the housing that supports the bearing are also supported. Since the housing must be inserted into the capstan insertion hole of the tape cassette, the overall size of the housing must be extremely small, leading to problems in accuracy and strength. A major problem with this dual-support type is that the bearing end surface at the tip of the capstan is a substantially flat surface, so when the tape cassette is inserted into and removed from the capstan, the tape collides with this end surface. Catch,
An accident occurred that damaged the tape. In particular, small cassettes are more prone to the above-mentioned accidents because the tape position at the tape opening is shallower than that of compact cassettes, making it easier for the tape to touch fingers and meander.

Purpose of the Invention The present invention provides a double-sided capstan bearing device that does not damage the tape when the tape cassette is attached to and removed from the device body.

Structure of the invention The present invention is a double-sided type capstan bearing, in which a first inclined surface is provided on the upper surface of the upper radial bearing that slopes downward toward the pinch roller crimping side surface of the capstan. A protrusion protruding forward from the pinch roller crimping side surface of the capstan is provided at the lower part, and a second sloped surface whose lower end is located rearward from the pinch roller crimping side surface of the capstan is provided on the lower surface of the protrusion. This is a capstan bearing device formed by forming a capstan bearing device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing a small-sized tape cassette, in which 1 is the tape cassette, 2 is a magnetic tape wound around reel hubs 3 and 4, and 5 is a capstan insertion hole into which a capstan is inserted. Figures 2 and 3 show a capstan bearing device inserted into the capstan insertion hole 5 of the tape cassette 1, where 6 is a capstan and 7 is a capstan housing, which is made of brass or aluminum die-casting. has been done.

A lower radial bearing 8 made of oil-less metal or the like is provided at the base of the capstan housing 7. Reference numeral 9 denotes a cap-shaped upper radial bearing made of synthetic resin or the like having wear resistance and lubricity, the lower part of which is press-fitted into the upper part of the capstan housing 7, and is formed on the rear side of the upper radial bearing 9. The locking pawl 9a is locked in the hole 7a of the capstan housing 7 to prevent it from coming off and to restrict its rotation. The upper surface of the upper radial bearing 9 has an inclined surface 10 whose top is the central extension of the capstan 6.
a, 10b are formed, and at least the lower part of the inclined surface 10a projects forward beyond the pinch roller crimping side surface 6a of the capstan 6, and furthermore, the lower surface of the projecting part 10c is formed into an inclined surface 10d, and this A lower end portion of the inclined surface 10d is located rearward of the pinch roller pressure bonding side surface 6a of the capstan 6.

With the above configuration, the capstan 6 is supported by the lower radial bearing 8 and the upper radial bearing 9, and as a result, the pinch roller pressure force applied to the capstan 6 is distributed vertically, allowing smooth rotation of the capstan. is obtained, and when the tape 2 is inserted into the capstan insertion hole 5 of the tape cassette 1 into the capstan 6, even if the tape 2 collides with the upper surface of the upper radial bearing 9, since the inclined surface 10a is formed on the upper surface, The tape 2 is guided from the inclined surface 10a by the protrusion 10c as shown by arrow A, and is inserted into the pinch roller pressing side surface 6a of the capstan 6. Therefore, the tape 2 is not caught on the upper surface of the upper radial bearing 9, and the tape cassette can be smoothly installed.

On the other hand, when the tape cassette 1 is removed, the lower end of the inclined surface 10d formed on the lower surface of the protrusion 10c of the upper radial bearing 9 is located behind the pinch roller crimping side surface 6a of the capstan 6. The tape 2 first comes into contact with the middle of this inclined surface 10d and is pulled upward as shown by the arrow B, whereby the tape 2 is smoothly removed without being caught on the upper radial bearing 9.

Therefore, even if the capstan 6 is of a dual-supported type, the tape 2 will not be damaged by the upper radial bearing 9 when it is inserted or removed.

Effects of the Invention As described above, the present invention is a double-sided type capstan bearing device, in which a first inclined surface is provided on the upper surface of the upper radial bearing that is inclined downward toward the pinch roller crimping side surface of the capstan. A second protruding portion is provided at the lower part of the inclined surface of the capstan and protrudes forward from the pinch roller crimping side surface of the capstan; According to this, when the tape cassette is inserted into the capstan, the tape is smoothly guided by the first slope, and when the tape cassette is removed, the tape is guided by the second slope.
Since the tape is pulled up while being guided by the inclined surface of the upper radial bearing, the tape is not damaged by the upper radial bearing, and is very practical.

In the above explanation, the radial bearing is attached to the capstan housing, but this is the same even if it is integrally formed, and the capstan is inserted into or removed from the tape cassette. The same applies to those using other methods.

[Brief explanation of the drawing]

FIG. 1 is a top view of a tape cassette, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is a sectional view thereof. 1...Tape cassette, 2...Tape, 5...
Capstan insertion hole, 6...Capstan, 6a
... Pinch roller crimping side surface, 7 ... Capstan housing, 8 ... Lower radial bearing, 9 ... Upper radial bearing, 10a ... Inclined surface, 10c ...
Projection, 10d...slanted surface.

Claims (1)

[Scope of utility model registration request] The capstan is supported by a lower radial bearing and an upper radial bearing provided at the lower and upper parts of the capstan housing, and a first radial bearing is provided on the upper surface of the upper radial bearing and is inclined downwardly toward the pinch roller crimping side surface of the capstan. An inclined surface is provided, and at the bottom of the first inclined surface there is provided a protrusion that protrudes forward beyond the pinch roller crimping side surface of the capstan, and on the lower surface of the protrusion, the lower end portion is attached to the pinch roller crimping side surface of the capstan. A capstan bearing device in which a second inclined surface is formed at a rearward position.