JPH0238507Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a threading device for a mechanical frequency display section used in a radio receiver.

[Conventional technology]

In a frequency display unit that uses a mechanical pointer to indicate a frequency scale printed on a transparent display board, it is necessary to slide the pointer in accordance with the rotational position of the tuning shaft. At this time, the pointer driving thread that interlocks the tuning shaft and the pointer is conventionally supported by shafts A and B which are caulked to the front surface of the holder 1, as shown in FIG. 23 is a pointer driving thread, and a pointer (not shown) is fixed to a part of the thread (between axes A and B). One end of the thread 23 passes through the through hole 2 of the holder 1 to the back side, where it is wound around a tuning shaft (not shown). The other end is folded back around axis B and attached to a helical spring (not shown). Reference numeral 24 denotes a protective member made of resin to prevent the end of the thread 23 from being worn out and cut when it passes through the through hole 2, and has a convex portion 25 for thread contact. This protective member 24 is attached to the back side of the holder 1 with screws 5, but in this case, a through hole 6 is provided on the holder 1 side to prevent the positional shift in the rotational direction.
A positioning boss 28 is formed on the fourth side to fit there. This boss 28 is limited in length so that it does not protrude toward the front side of the holder 1.

[Problem that the invention attempts to solve]

By the way, the threading mechanism described above requires metal shafts A and B, which increases the number of parts and the crimping process, resulting in high costs. In the present invention, the boss 28 of the protection member 24 is made to protrude to the front side of the holder 1, and by using this as a threading member, the crimping axis A
This is an attempt to omit the .

[Means for solving problems]

The present invention is a threading device for a frequency display section that slidably supports a pointer drive thread that moves a pointer in conjunction with the rotation of a tuning shaft, and the thread is threaded from the back to the front of a holder to which the tuning shaft is attached. A protective member having a convex portion for preventing wear of the thread is attached from the back side of the holder to a through hole formed to allow the thread to pass through, and a boss for positioning the protective member with respect to the holder projects to the front side of the holder. It is characterized in that it serves as a support member for the thread.

[Effect]

By making the positioning boss of the protective member long enough to protrude from the front of the holder, it can also be used as one of the support members for the needle drive thread, eliminating one metal caulking shaft. It is possible to reduce costs. Furthermore, since there is more space available, there is also the advantage that the degree of freedom in design increases.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention, and the same parts as in FIG. 2 are given the same reference numerals. This example differs from FIG. 2 in that there is no caulking shaft A. Instead, the positioning boss 28 of the protective member 24 is lengthened, and its tip is sufficiently protruded from the front of the holder 1, so that the thread 23
It is designed to serve as a support member for. In this way, the number of man-hours and number of parts required for the caulking shaft A can be reduced and the cost can be reduced.

Figure 3 shows a specific example of a car radio receiver to which the present invention is applied, in which a is an assembled perspective view, b is a plan view, and c
is a front view of the holder alone, and d is a front view of the printed circuit board alone. The holder 1 is made of metal, has a cut-and-raised part 8 formed in its vertical part, and a tuner 20 in its horizontal part.
will be installed. 21 is the tuning axis, Tuner 2
0 is connected by an Oldham joint 22. 23
is a thread for driving the pointer, one end of which is wound around the tuning shaft 21, and the other end connected to the cut-and-raised part 8 via the spring 3. 24 is a threading protection member with protrusions 25 for reducing friction at the front and rear, and 28 is a positioning boss according to the present invention. Further, 26 is a threading boss at the turning point, which corresponds to the axis B. A pointer 30 is fixed to a part of the thread 23 and slides on the back plate 31. 32 is an electric component such as a slide volume. Reference numeral 33 denotes another screw for mounting the printed circuit board, which is screwed into the screw hole 27 of the threading boss 26 through the through hole (or notch) 34. In addition to this, the printed circuit board 6 is equipped with an LED 35 for display and a lamp 36 for illumination. 40 is the front decoration plate,
It has a transparent display plate 42 on which a frequency scale 41 is printed. 43 is a through hole of the tuning shaft 21.

[Effect of idea]

As described above, according to the present invention, by making the positioning boss of the protective member long enough to protrude from the front of the holder, it can also be used as one of the support members for the pointer driving thread. Therefore, one metal caulking shaft can be omitted, resulting in cost reduction. Furthermore, since there is more space available, there is also the advantage that the degree of freedom in design increases.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing an example of a conventional threading mechanism.
Figures a to d are configuration diagrams showing specific examples of the present invention. In the figure, 1 is a holder, 2 is a through hole, 21 is a tuning shaft,
23 is a pointer driving thread, 24 is a protection member, 28 is a positioning boss, 30 is a pointer, and 41 is a frequency scale.

Claims (1)

[Scope of utility model registration request] In a threading device for a frequency display unit that slidably supports a pointer driving thread that moves a pointer in conjunction with the rotation of a tuning shaft, the thread is passed from the back to the front of a holder to which the tuning shaft is attached. A protective member having a convex portion for preventing wear of the yarn is attached to the formed through hole from the back side of the holder, and a positioning boss of the protective member with respect to the holder protrudes from the front side of the holder to protect the yarn. A threading device for a frequency display section, characterized in that it serves as a support member for a frequency display section.