JPS643231Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of use Dial devices such as FM radio receivers generally have a dial pointer moved by a thread. In other words, the dial knob, the variable capacitor drum and pulley that are coaxially connected to the rotary shaft that changes the capacity of the variable capacitor for tuning the receiving frequency, are used to form a closed loop with a thread to which the dial pointer is fixed in part. This thread is wound and moved by turning the dial knob, causing the dial pointer to slide on the dial display section.

This invention particularly relates to the threading mechanism of such a thread-driven dial device.

Background Art and Problems There have been proposed very small and thin radio receivers.

In the case of such ultra-compact radio receivers, if the pulley that forms part of the dial threading mechanism of a thread-driven dial device is supported by a chassis, the radio set is extremely thin and compact. In addition, various problems arise when using a molded chassis as the chassis. That is, it is difficult to support the shaft of the pulley at both ends, that is, to support it at two points, due to the mold structure and workability. This is because two-point support has the disadvantage that it is very difficult to attach the pulley, and when making a molded chassis, it is necessary to raise a mold with two-point support.

Therefore, a simple idea is to support the shaft of the pulley at one point. However, by turning the dial knob, the tension generates a force in the thread that points inward to the closed loop, which creates lateral pressure against the shaft of the pulley and acts to bend this shaft. If this shaft is supported at one point, this side pressure may cause the shaft to bend toward the inside of the closed loop, causing the shaft to fall or the thread to come off.

Therefore, it is conceivable to lengthen the press-fitting allowance for press-fitting the pulley shaft into the chassis, but doing so would impair miniaturization.

Purpose of the invention In view of the above points, this invention has been developed so that even if the support part for press-fitting the shaft of the pulley into the molded chassis is at one point and the press-fitting margin is small, when lateral pressure is applied to this shaft, The purpose is to create a structure that is mechanically durable.

Summary of the invention In this invention, a thread with a dial pointer fixed to a part thereof is wound so as to form a closed loop through a variable condenser drum, a dial knob, and a pulley, and by rotating the dial knob, In a dial device configured such that the dial pointer moves above the dial display section via a thread, the pulley is rotatably attached to a support pin, and the support pin is attached to one end of the pulley with respect to the chassis. A stopper is provided to prevent the other end of the support pin from tilting with respect to the vector direction of the lateral pressure applied to the support pin.
This enables one-point support and is suitable for thin shapes.

Embodiment Hereinafter, an example of this invented device will be explained with reference to the drawings.

Figure 1 shows a perspective view of case 1 of an FM-AM radio receiver to which the dial device of this invention is applied. Case 1 consists of half 1A and half 1.
It consists of B. The dial display section 2 is provided on one side of the thick part of the case 1.
3 is a dial pointer.

FIG. 2 shows an example of the general structure of a dial device according to this invention, and is a view of the case 1 with the lower half 1B removed, viewed from the back side.

In Figure 2, 3A connects the pointer 3 to the dial thread 4.
This is a support member for fixing to. Also,
2 is a dial display board. In the figure, the shaded portion is formed by integral molding of resin together with the chassis 5.
This is the part that was planted from.

Reference numeral 6 denotes a housing in which a variable capacitor for tuning is housed, from which a rotating shaft 7 protrudes outside for varying the capacity of the variable capacitor.
A drum 8 is attached to the drum 8. 9 is a tuning knob, and this tuning knob 9
A thread hooking portion 9A is formed concentrically integrally with the thread hooking portion 9A.

Further, 10 and 11 are pulleys. The thread 4 is wound around these pulleys 10 and 11, over the thread hook 9A of the tuning knob 9, and over the variable converter drum 8, so that the thread 4 forms a closed loop. In this case, the yarn is wound around the variable converter drum 8 once to several times, and the variable converter drum 8 is provided with a coil spring, which causes the yarn to
is tensioned, and similarly the thread hooking part 9 of the tuning knob 9
The thread is also wound around A once to several times. Therefore, when the tuning knob 9 is turned, the thread hook 9A rotates together with it, the variable capacitor drum 8 rotates, the capacitance of the variable capacitor is varied, the tuning frequency is changed, and at the same time, the tuning point is set by the pointer 3. is displayed on the display board 2.

The pulley 10 is shown in FIG. 3, which is a sectional view taken along line B-B' in FIG. 2, and the pulley 11 is shown in FIG.
As shown in FIG. 4, which is a cross-sectional view of -A', support pins 12 and 13 each have a shaft portion and collar portions, or disks 14 and 15, provided integrally therewith.
This support pin 12 is rotatably inserted into the
and 13 are press-fitted into the chassis 5 at one end of their respective shafts, and these support pins 12 and 13 are supported by the chassis 5. Note that the discs 14 and 15 of the support pins 12 and 13 have a diameter larger than the outer diameter of the pulleys 10 and 11. On the other hand, a stopper wall 16 is integrally molded and erected from the chassis 5 in a direction parallel to the axial direction of the support pins 12 and 13, and is approximately equal to or slightly higher in height than the support pins 12 and 13. ing. Discs 14 and 15 provided on the other end sides of the support pins 12 and 13 abut against a stopper wall 16 raised from the chassis 5. Moreover, as shown in FIG. 2, this stopper wall 16 is arranged in the direction of the vectors P and P' of the lateral pressure applied to the support pins 12 and 13 of the pulley when the thread 4 is wound around the support pins 12 and 13. 13 is provided inside the closed loop formed by the thread 4 to prevent it from falling in this direction. Therefore, although the support pins 12 and 13 are supported at one point, when the support pins 12 and 13 receive lateral pressure due to the tension of the thread 4, the other end side of the support pins 12 and 13 The discs 14 and 15 abut against the stopper wall 16 and the support pins 12 and 13 are prevented from tilting.

Note that the tension caused by the thread 4 is usually caused by a tension spring being provided in the thread 4 path to keep the thread 4 taut, and this tension causes the support pins 12 and 13 to move in the direction indicated by the arrow in the figure. lateral pressure vector P in the direction of
and P′.

In the above example, the stopper wall 16 is molded integrally with the chassis 5, but it is not necessary to mold the stopper wall 16 integrally with the chassis 5. In short, the support pin 1
The stopper wall 16 may be provided so as to block the other ends of the supports 2 and 13, which are not the support points, from the direction of the side pressure they receive. Therefore, the disks 14 and 15 at the other ends of the support pins 12 and 13 can of course be replaced by the stopper wall 16.

Effects of the invention As described above, according to this invention, a stopper is provided at the end of the supporting pin supported at one point, which is not the supporting end side, to prevent the side pressure from being applied due to the tension of the thread. This makes it appear as if it were supported at two points, and the support pin will not bend even if it receives lateral pressure due to the tension of the thread. Moreover, the stopper is not longer than the length of the support pin, making it very effective as a dial device for a thin and ultra-compact radio receiver.

In addition, the structure for this purpose is very simple because it is sufficient to simply provide a stopper at a position that prevents the side pressure from being received on the end of the support pin that is not on the one-point support side. It has the advantage of being In addition, since it is supported at one point, the pulley can be attached very easily, and the mold can also be made relatively easily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a radio receiver to which this invented device is applied, FIG. 2 is a diagram for explaining the main parts of an example of this invented device, and FIG.
B' sectional view, and FIG. 4 is its AA' sectional view. 3 is the dial pointer, 4 is the thread, 5 is the chassis, 8
is the variable condom drum, 9 is the tuning knob, 10 and 1
1 is a pulley, 12 and 13 are support pins, and 16 is a stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] A dial thread is stretched over a variable converter drum, a dial knob, a pulley, etc., and a dial pointer is attached to this dial thread, and when the dial knob is operated, this operation is performed as described above. In a dial device in which the dial pointer is moved while being transmitted to the variable converter drum through a dial thread, the pulley is rotatably attached to a support pin, and the pulley is rotatably attached to one end of the support pin. is fixed to the chassis, and the other end of the support pin is provided with a collar having a diameter larger than the diameter of the pulley, and the direction of the vector of lateral pressure applied to the support pin due to tension of the dial thread is In the dial device, a stopper portion is provided at a position facing the flange portion to receive the lateral pressure and prevent the support pin from tilting or deforming.