JPS5837729B2 - dial device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dial device that is useful for use in radio receivers, tuners, etc., and in particular, it is capable of easily threading a dial thread, and can always provide stable, high-quality dial thread. It is an object of the present invention to propose a dial device that can ensure a tensioned construction state and also that can easily adjust the slip of the slip mechanism.

For example, as shown in FIG. 1, a conventional dial device includes a drum 23 fixed to a rotating shaft 22 of a variable capacitor 21, and a dial pointer 24 for indicating a tuned frequency while driving the drum 23 to rotate. A tuning shaft 26 having a tuning knob 26a that is driven to travel along the
, a plurality of gaddo rollers 29, a dial thread 28 stretched around the shaft 26, the drum 23, and a plurality of guide rollers 29, and a spring whose one end is engaged with a boss 23a protruding from the drum 23 in order to stretch the thread. 27
It is composed of.

In this type of conventional dial device, the variable capacitor 2
After the rotating shaft 22 of the dial 1 is completely rotated to the right, the dial thread 28 is twisted around the shaft 26.

That is, in general, when the variable capacitor 21 is fully turned to the left and the rotor and stator are completely overlapped, or when the variable capacitor 21 is fully clockwise and the rotor is completely removed from the stator, the rotation axis of the variable capacitor 21 is It cannot be rotated any further.

Therefore, when the tuning shaft 26 is further rotated, a slip occurs between the tuning shaft 26 and the dial thread 28 wound around the shaft 26, so that the tuning shaft 26 idles relative to the dial thread 28. It becomes.

Incidentally, in order to ensure good slippage between the tuning shaft 26 and the dial 28, the dial thread 2B should be suspended loosely, but if it is too loose, the rotational force of the tuning shaft 26 will cause damage to the variable capacitor 21 and the dial. This results in problems such as the dial pointer 24 being moved intermittently as the dial pointer 24 is not properly transmitted to the pointer 24.

Conversely, when the dial thread 28 is strongly suspended, the rotational force of the tuning shaft 26 is reliably transmitted to the variable capacitor 21 and the dial pointer 24, but on the other hand, the frictional resistance between the dial thread 28, the tuning shaft 26, the drum 23, etc. Therefore, a large force is required to operate the tuning shaft 26, and moreover, when the variable capacitor 21 is fully turned, the tuning shaft 2
6 and the dial thread 28, which caused the problem that the dial pointer 24, the variable capacitor 21, etc. were damaged.

In this way, it is possible to adjust the appropriate slip state of the slip mechanism between the tuning shaft 26 and the dial 28, and to adjust the dial thread 2.
Adjustment of the installation condition, such as the tension of 8, has a subtle effect on the performance of the dial device as a whole.

Therefore, for the slip mechanism and the winding work of the dial thread 28,
It required extreme skill.

The present invention aims to eliminate these conventional drawbacks, and in particular improves the slip mechanism of the dial device, thereby making it possible to wind the dial thread easily and quickly. , Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic front view of the main parts of the dial device according to the present invention.

In FIG. 2, reference numeral 1 denotes a base made of synthetic resin or the like, and a dial display plate 2 is arranged on this base 1.

The display panel 2 is made of transparent or semi-transparent glass or Hewei resin material.

A dial display section such as frequency numbers and a frequency scale is printed on the surface of the display board 2.

Further, a support shaft 4 is attached to the right end of the base body 1, and a driven wheel is rotatable around the support shaft 4 and has a thread winding portion 5a integrally attached to the center. That is, in this embodiment, the driven gear 5 is attached.

Incidentally, a plurality of guide rollers 7 serving as guide members are rotatably provided around the dial display plate 2 of the base body 1, and these driven gears 5 and a plurality of idle rollers 7 have the following functions:
A dial thread 6 is stretched around each of them.

A pointer (not shown) for indicating a predetermined position of the dial display section is fixed to a position of the dial thread 6 facing the dial display section, and as the dial thread 6 moves, the dial The pointer moves along the dial display board 2.

The driven gear 5, the guide roller 7, and the dial thread 6 to which the pointer is attached, which is stretched around the driven gear 5 and the guide roller 7, constitute a pointer running system mechanism. It is divided into blocks via the base 1 and configured as one unit independently of a drive system mechanism to be described later.

On the other hand, an operation unit 8 that constitutes a drive system mechanism added to a chassis in a housing of a radio receiver or the like includes a tuning shaft 8a,
As shown in FIG. 4, a driving wheel, in this embodiment, a large-diameter gear 8b, a small-diameter gear 8c attached to one end of the tuning shaft 8a, and a shaft A dial knob 8d made of synthetic resin is attached to the other end of the shaft h8a, and in this embodiment, a slip mechanism is provided between the other end of the shaft h8a and the dial knob 8d.

That is, the fitting shaft 10 protruding from one side of the center part of the dial knob 8d is inserted into the through hole 11a of the clamping part 11 provided at the other end of the tuning shaft 8a. It is held elastically and frictionally by the shaft 8a.

Therefore, a dial knob 8d is attached to the tuning shaft 8a so that the inner circumferential surface of the through hole 11a of the shaft 8a and the outer circumferential surface of the shaft 8a can frictionally engage with each other.

The above-mentioned slip mechanism 9 has a dial knob 8 opposite to this structure.
By providing an insertion hole in the fitting shaft 10 of d and elastically inserting the other end of the tuning shaft 8a into the insertion hole, the gap between the outer peripheral wall of the fitting shaft 10 and the inner peripheral surface of the tuning shaft 8a is It may also be possible to attach it in a frictionally coupled state.

As described above, in normal times, the dial knob 8d and the tuning shaft 8a rotate integrally and simultaneously through the slip mechanism 9, but when a force is applied to one of them to prevent rotation beyond a predetermined level, the slip mechanism 9 rotates as a unit. Mechanism 9 works to cause relative slip.

Next, the driven gear 5 is arranged to mesh with the large diameter gear 8b.

Therefore, when the dial knob 8d is rotated, its rotational force causes the dial thread 6 to run in a predetermined direction via the large diameter gear 8b and the driven gear 5, and moves the pointer on the dial display plate 2.

A small diameter gear 8c attached to the tuning shaft 8a is meshed with a rotation control body 12 having a gear portion 17a on the annular inner edge.

This rotation control body 12 includes a boss portion 15 provided at the center,
An annular outer peripheral portion 1 arranged to surround this at a distance from this
7, and a plurality of elastic connecting pieces 16 that connect the outer peripheral part 17 and the central part 15, and are integrally formed of, for example, synthetic resin.

The boss portion 15 of the rotation control body 12 is provided with a fitting hole 15a into which the rotating shaft 14 of the variable capacitor 13 is inserted and fitted.

Since the drive system mechanism that constitutes the present invention is provided with the rotation control body 12 as described above, when the dial knob 8d is rotated, the rotational force is transmitted to the small diameter gear 8c, and further meshes with the small diameter gear 8c. The rotational force is transmitted to this rotation control body 12, which rotates the rotation shaft 14 of the variable capacitor 13.

Therefore, the capacitance of the variable capacitor 13 can be varied and tuned to the desired receiving frequency.

Even when the dial knob 8d is forcibly rotated beyond a certain amount of rotation, the plurality of connecting pieces 16 absorb this large force, and the excessive force is directly applied to the rotating shaft 1 of the variable capacitor 13.
This is to prevent the information from being transmitted to 4.

The regulating piece 17b protruding from the inner circumferential surface of the annular outer circumferential portion 17 is rotated by the rotation of the small diameter gear 8c.
2 reliably prevents the variable capacitor 13 from being urged to rotate beyond the safe rotation range of its rotating shaft 14.

The base body 1 is attached to the chassis so that the large-diameter gear 8b meshes with the driven gear 5, and the base body 1 can be removed from the chassis. 5 and the large diameter gear 8b can be disengaged from each other.

When the dial knob 8d is rotated, the rotational force of the dial knob 8d is transmitted as rotation of the large-diameter gear 8d, and the driven gear 5 meshed with the large-diameter gear 8d rotates.

Accordingly, the dial pointer fixed to the dial thread 6 moves to indicate a predetermined frequency display on the scale plate 2.

At the same time, the small diameter gear 8c transmits the rotation of the dial knob 8d to the rotation control 12, and the rotation of the variable capacitor 13 is controlled to select the reception frequency.

As described above, the present invention includes a drive mechanism such as the dial knob 8d, the tuning shaft 8a, the operating wheel 8b, and the variable condenser 13, a driven wheel for running the dial thread 6, a guide member for guiding the dial thread 6, That is, the traveling system mechanism including the guide pulley 7 and the like are provided independently.

That is, the dial thread 6 is not directly stretched around the drive system mechanism.

Therefore, the slip adjustment between the dial knob 8d and the tuning shaft 8a of the drive system mechanism, and the tension of the dial string 6 of the running system mechanism can be freely adjusted independently of the installation state.

This slip adjustment can easily adjust the slip state when the variable capacitor 13 stops rotating in a state where no traveling system mechanism is present.

In addition, it can be adjusted independently of the running system mechanism, that is, there is no need to wind the dial thread 6 around a long shaft of the drive system mechanism 8, such as the synchronized shaft 8a, and there is no need to wind the dial thread 6 around a long shaft of the drive system mechanism 8, such as the synchronized shaft 8a. Since there is no need to take into account the friction of the objects, threading work can be made easier.Furthermore, according to the present invention, the traveling system mechanism and the drive system mechanism can be manufactured and adjusted on separate work lines, and each can be adjusted individually. Since it is only necessary to assemble such a gear so that the driven gear 5 of the travel system mechanism meshes with the small diameter gear 8c of the drive system mechanism, mass production can be facilitated and productivity can be increased.

Furthermore, according to the embodiment described above, the scale on the display board 2 and the dial pointer may not be easily visible in a dark place, for example, and this may cause the user to rotate the dial knob more than necessary. Even when something happens,
If too much force is applied to the variable capacitor 13, causing damage to the variable capacitor 13, or if the bond between the dial pointer and the variable capacitor 13 becomes disconnected due to the adhesive, the relationship between the dial pointer and the variable capacitor 13 may become misaligned, and correct frequency display may not be possible. It will never go away.

That is, in this embodiment, the range in which the movement of the dial pointer is regulated is determined by the relative relationship with the rotation range of the rotation control body 12 and the variable capacitor 13, and therefore, the The rotation of the rotation control body 12 is regulated before the variable capacitor 13 is damaged or the dial pointer comes off from the dial thread 6.

Therefore, even if the small diameter gear 8c rotates the rotation control body 12 by rotating the dial knob 8d and the control body 12 attempts to exceed the breakage limit of the rotation shaft 14 of the variable capacitor 13, the breakage limit is At the position, each of the above connecting pieces 1
6 is bent, so that the excessive rotational force of the dial knob 8d is absorbed by these connecting pieces 16.

When an even larger force is applied to the rotation control body 12, the small diameter gear 8c comes into contact with the regulating piece 17b, and therefore the fitting shaft 10 of the dial knob 8d is connected to the tuning shaft 8a of the operating section 8. A slip operation is performed while the large diameter gear 8b remains inserted, and excessive rotation of the large diameter gear 8b is prevented.

Therefore, the force due to excessive operation of the dial knob 8d is applied to each of the connecting pieces 16 and the dial knob 8.
It will be absorbed or limited by the friction of the slip mechanism 9 between d and the tuning shaft 8a.

Note that the slipping operation of the slipping mechanism 9 does not have to start when the small diameter gear 8c and the regulating piece 17b come into contact with each other, but may start when each connecting piece 16 is bent.

That is, the slipping operation may be performed using a strong force after each connecting piece 16 begins to bend.

In this case, there is a wide range of adjustment at the time when the slip mechanism 9 starts slipping, and the adjustment of the slip state does not have to be precise.

In this way, the variable capacitor 13 does not rotate beyond its rotational limit, and therefore, damage to the functions of the variable capacitor 13 and the like is completely prevented.

Furthermore, the traveling system does not rotate more than necessary.

As is clear from the above description, the present invention provides a drive system mechanism and a running system mechanism separately and independently, a dial thread is stretched around the running system mechanism, and this dial thread is wound around the drive system mechanism. This structure makes it easier to wind the dial thread, and there is no need to strictly consider the dial thread when adjusting the frictional force of the friction coupling means, that is, the slip means, provided in the drive system mechanism. Therefore, this adjustment means can be easily carried out, and the adjustment of this slip mechanism can be easily carried out by attaching a rotation control body having a structure like that of this embodiment to the variable capacitor shaft and making it related to the operation section. There is no need to make precise adjustments.

Therefore, in conjunction with the ease of adjustment of the slip mechanism due to the above-mentioned reasons, the adjustment can be made even easier.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an outline of a conventional dial device. FIG. 2 is a schematic front view of the dial device according to the present invention, FIG. 3 is a front view of the main part thereof, and FIG. 4 is a side sectional view of the main part showing the peripheral part of the variable capacitor shaft. 1...Base body, 2...Display board, 5...
...Driver gear, 7...Guide pulley, 6...
...Dial thread, 8d...Dial knob,
12... Rotation control body, 13... Variable capacitor, 14... Rotation shaft of variable capacitor.

Claims (1)

[Claims] 1. It has a drive system mechanism and a traveling system mechanism, and the drive system mechanism includes a dial knob, a drive wheel that rotates in conjunction with the rotation of the dial knob, and a rotating shaft of a variable capacitor that rotates in conjunction with the rotation of the drive wheel. and a slip mechanism that slips the rotation operation of the rotation knob when the rotation of the rotation shaft of the variable capacitor stops, and the traveling system mechanism includes a driven wheel, a plurality of guide members, and a drive wheel and a plurality of guide members. It consists of a dial system that is stretched around the dial system and a pointer attached to a position facing the dial display part of this dial system, and the drive system mechanism and traveling system mechanism are arranged so that the drive wheel and the driven wheel are rotatably connected. dialing device.