JP2512344Y2 - Capstan shaft holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improved technique for a capstan shaft holder in a small magnetic tape recorder.

(Prior Art) A magnetic tape pulled out from a tape cassette in a magnetic tape recorder or the like is sandwiched between a capstan shaft and a pinch roller and travels at a constant speed.

The capstan shaft that rotates at a constant speed is driven by a capstan motor, stands up on the chassis, and receives tape tension and pinch roller pressing force. Therefore, the capstan shaft needs to have sufficient bending rigidity.

Generally, the capstan shaft is cantilevered on the chassis side, but from the viewpoint of the rigidity, a holder having a double-end support structure that also supports the upper part of the capstan shaft is being adopted.

On the other hand, in order to reduce the size of the magnetic tape recorder, it is more advantageous that the capstan shaft is closer to the tape cassette.

(Problems to be solved by the invention) However, when the capstan shaft is very close to the tape cassette, the tape cassette slides into the holder of the capstan shaft when the tape cassette is loaded or unloaded, and after a long period, Scratches occur on the relatively soft tape cassette side.

When the capstan shaft holder is die-cast, the ground is rough and the scratches are deep.

Therefore, an object of the present invention is to provide a technique for protecting the tape cassette.

(Means for Solving the Problem) In order to achieve the above object, the present invention is characterized in that a slidable resin is applied to the outer peripheral surface of a holder of a capstan shaft.

(Operation) The tape cassette moves up and down while coming into contact with the holder of the capstan shaft, but the slidable resin on the outer peripheral surface of the holder smoothes this sliding contact, thereby preventing the occurrence of scratches on the tape cassette side.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a holder for a capstan shaft according to the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a sectional view taken along the line III-III of FIG. , "Holder 1") has a first bearing 3 at one end of a so-called half-cylindrical portion 2 in which a cross section (Fig. 3) is formed by cutting out a part of the cylinder.
(Fig. 2) is attached, the second bearing 4 is attached to the lower portion of the cylindrical portion, and the slidable resin 5 is applied to the outer peripheral surface 2a of the cylindrical portion 2 as shown in Figs. .

The slidable resin 5 is, for example, polytetrafluoroethylene resin and has a planar film thickness of 15 to 50 μm.

 The operation of the holder having the above structure will be described below.

As shown in FIG. 2, by fitting the holder 1 to the substrate 10,
If necessary, these are brazed or fusion welded, and the capstan shaft 11 is inserted from below.

The capstan shaft 11 has an upper part 11a on the first bearing 3 and a lower part 1
1b fits into the second bearing 4.

In addition, 13 is a stator coil, 14 is a rotor integrated with a capstan shaft, 15 is a magnet on the rotor side, and 16 is a connector (FIG. 1).

Therefore, the capstan shaft 11 composed of the coil 13 and the rotor 14 drives the capstan shaft 11.

The capstan shaft 11 is fixed to the chassis 18 together with the capstan motor 12 with screws 17 ...

FIG. 4 is an explanatory view of the operation, in which the tape cassette 20 shown by the imaginary line is being lowered by a loading mechanism (not shown),
The front door 21 is opened and the magnetic tape 22 is held on the right side of the capstan shaft 11 in the figure.

This magnetic data 22 is sent to the pinch roller 23 and the capstan shaft
Pressed on 11.

On the other hand, the surface 20a of the tape cassette 20 descends while being in contact with the surface of the holder 1 on the left side of the drawing, that is, the surface of the slidable resin 5. However, since the surface of the resin 5 has a very small coefficient of friction, it does not damage the surface 20a of the tape cassette.

Table 1 shows a comparison of the friction coefficient and the like between the resin coating holder having such an effect and the conventional holder.

(Effect of the Invention) As described above, according to the present invention, there is no fear of damaging the tape cassette, the life of the tape cassette is extended, and the miniaturization of the magnetic tape recorder or the like is promoted.

[Brief description of drawings]

FIG. 1 is a side view of a capstan shaft holder according to the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 1 ... Capstan shaft holder, 2 ... Half cylinder part, 2a ... Outer peripheral surface, 3 ... First bearing, 4 ... Second bearing, 5 ... Sliding resin, 11 ... … Capstan axis, 20 ……
Tape cassette.

Claims (1)

(57) [Scope of utility model registration request] 1. A capstan shaft holder configured to slidably contact the tape cassette with a holder of a capstan shaft as the tape cassette moves up and down, wherein the capstan shaft holder is the capstan shaft. And a slidable resin applied to the outer peripheral surface of the cylindrical portion, and a bearing that is attached to the cylindrical portion and holds the upper and lower portions of the capstan shaft so that they can rotate at high speed. This is a capstan shaft holder.