JPS5823770B2 - push button tuner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when a channel selection member is pressed, a frequency memory piece provided in the channel selection member collides with a cam plate that moves laterally in conjunction with a variable tuning element, thereby generating a cam. This relates to a so-called push-button tuner in which radio broadcasting stations are selected by moving a plate laterally, and its purpose is to increase the horizontal stroke of the cam plate to improve tuning accuracy. be.

Generally, in this type of tuner, the longer the movable stroke of the variable tuning element, the higher the tuning accuracy can be obtained.

On the other hand, the amount of lateral movement of the cam plate connected to the town variable tuning element is determined by the arrangement pitch of multiple tuning members arranged in the formwork, and the width of radio receivers is particularly limited due to the demand for miniaturization of equipment. Therefore, the arrangement pitch of the tuning members is restricted, and the amount of lateral movement of the cam plate cannot be increased.As a result, in order to improve the precision of the tuner, the precision of the parts must be strictly improved.

Therefore, the present invention aims to improve the tuning accuracy by increasing the amount of lateral movement of the cam plate, even if the arrangement pitch of the tuning members remains the same as before. To explain, FIG. 1 is a plan view of the main parts showing the relationship between a conventional cam plate and a frequency storage piece, and 1 is a cam plate,
Reference numeral 2 denotes a guide hole, which is fitted into a guide pin 3 on the formwork so as to be movable laterally.

4 shows a V-shaped cam part provided on the cam plate 1, and as the channel selection member 8 is suppressed, the abutment pin 6 of the frequency storage part 7 locked at an arbitrary position is placed on the cam part 4. The cam part 4
It is designed to collide with the

Reference numeral 5 denotes a middle core, which is attached to a mounting portion 9 at one end of the cam plate.

Let P be the arrangement pitch of the channel selection members, and let S be the swing width of the abutment pin 6. When the cam plate 1 moves laterally to the right as shown in FIG. Since the abutment pin 6 can swing only up to the broken line position, the swing width of the abutment pin 6 cannot be greater than 1/2P, that is, the cam plate 1
Therefore, when considering the diameter of the abutting pin 6, it must be 1/2P>S.

FIG. 2 shows an embodiment of the structure of the present invention, in which a conventional cam plate is used as a main cam plate 10, and an auxiliary cam plate 11 is superimposed on the upper or lower side thereof.

This auxiliary cam plate 11 is provided with continuous convex portions, and the pitch of each convex portion is the same as the pitch of the cam portions 4 of the main cam plate 10.

The tip of each convex portion is located at the cam portion 4 of the main cam plate 10 as shown in the figure.
The bottom 12 of the cam portion 4 of the main cam plate 10 is shallower than the bottom 13 of the auxiliary cam plate 11, and The apex 14 of the cam portion 4 of the main cam plate 10 is formed lower than the apex 15 of the convex portion of the auxiliary cam plate 11.

The auxiliary cam plate 11 is also guided by the formwork A (not shown) so as to be able to move laterally to the right of the main cam plate 10.

16.17 is the auxiliary cam plate 11 relative to the main cam plate 10, and when the auxiliary cam plate 11 moves laterally to the left side lateral movement limit position as shown in FIG. The first operating position is where the left inclined portion 4a and the left guide inclined portion 18a of the auxiliary cam plate 11 extend continuously, and the auxiliary cam plate 11 is laterally moved to the right lateral movement limit position as shown in FIG. A guide hole that connects the right inclined portion 4b of the cam portion 4 of the main cam plate 10 and the right guide inclined portion 18b of the auxiliary cam plate 11 so as to be movable between a second operating position where they extend continuously. In the embodiment, the auxiliary cam plate 11 is provided with a guide hole 16, and the main cam plate 10 is provided with an engagement protrusion 17.

19 and 20 are the left inclined portion 4a of the cam portion 4 of the main cam plate 10 and the left guide inclined portion 18 of the auxiliary cam plate 11, as shown in FIG.
When the main cam plate 10 reaches the rightward lateral movement limit position in the first operating position where
movement in the right direction, and the second operating position where the right inclined portion 4b of the cam portion 4 of the main cam plate 10 and the right guide inclined portion 18b of the auxiliary cam plate 11 are continuous, as shown in FIG. When the main cam plate 10 reaches the leftward movement limit position, a regulation hole and a regulation pin are used to respectively regulate the leftward movement of the auxiliary cam plate 11. In the embodiment, the regulation hole 19 is A case is shown in which regulating pins 20 are provided on each of the auxiliary cam plates 11 in the formwork A.

Although not shown, the main cam plate 10 and the auxiliary cam plate 11 are supported on the formwork A so as to be able to move laterally, as in the conventional case.

As shown in FIG. 2, the main cam plate 10 and the auxiliary cam plate 11 are respectively located at the center of the lateral movement stroke with respect to the formwork A, and therefore the regulation pin 20 is also located at the center of the regulation hole 19. , when the abutment pin 6 is locked at the rightmost position as shown in the left end of the figure, when the channel selection member 8 is moved forward by a pressing operation, the abutment pin 6 first touches the auxiliary cam plate 11. Only the auxiliary cam plate 11 moves laterally to the right by contacting the right guiding inclined part 18b of the convex part, and the right guiding inclined part 18b moves the right guiding inclined part 18b of the main cam plate 10 as shown by the imaginary line in FIG. The regulation hole 1 formed in the formwork A is continuous with the part 4b.
A regulating pin 20 abuts against the right end of the main cam plate 9 to restrict its lateral movement, and the abutting pin 6 abuts against the right inclined portion 4b of the cam portion 4 of the main cam plate 10.

Then, only the main cam part 10 moves laterally to the right, and finally the abutting pin 6 matches the bottom part 12 of the cam part 4 of the main cam plate 10, and at the same time the engaging protrusion 11 moves to the right end of the guide hole 16. When they come into contact, the state shown in FIG. 3 is achieved.

In this state, the left inclined portion 4a of the cam portion 4 of the main cam plate 10 and the left guide inclined portion 18a of the protrusion of the auxiliary cam plate 11 are continuous with each other, and the auxiliary cam plate 11 is connected to the regulating hole 19 and the regulating pin. 20, movement to the right is prevented.

Next, from the state shown in FIG. left guide slope part 1
8a, only the auxiliary cam plate 11 moves laterally to the left, and the left guide inclined portion 18a moves to the left inclined portion 4a of the main cam plate 10.
At this time, the regulating pin 20 abuts against the left end of the regulating hole 19 formed in the formwork A, and its lateral movement is regulated, and the abutting pin 6 aligns with the left tilt of the cam part 4 of the main cam plate 10. It collides with part 4a.

Then, only the main cam plate 10 moves laterally to the left, and finally the abutment pin 6 aligns with the bottom 12 of the cam part 4 of the main cam plate 10, and at the same time, the engagement protrusion 17 moves to the left end of the guide hole 16. When they come into contact, the state shown in FIG. 4 is achieved.

In this state, the right inclined portion 4b of the cam portion 4 of the main cam plate 10 and the right guide inclined portion 18b of the protrusion of the auxiliary cam plate 11 are continuous with each other, and the auxiliary cam plate 11 is connected to the regulating hole 19 and the regulating pin 20. Lateral movement to the left is prevented by engagement with.

Next, the abutment pin 6 presses the channel selection member 8 located at the rightmost position, so that the main cam plate 10 reaches the right movement limit position, and the left inclined portion 4a of the main cam plate 10 and the auxiliary cam plate 11 When the abutment pin 6 is pressed against the channel selection member 8 locked at the leftmost position from the state shown in FIG. 6 moves forward and first the left guide inclined part 1 of the auxiliary cam plate 11
8a, the auxiliary cam plate 11 starts to move laterally to the left, and along with this, the main cam plate 10 also moves laterally in the same direction through the engagement between the regulating hole 19 and the regulating pin 20. do.

When the regulating pin 20 contacts the left end of the regulating hole 19, the abutting pin 6 contacts the left inclined portion 4a of the main cam plate 10, causing only the main cam plate 10 to further move laterally to the left and engage. The protrusion 17 comes into contact with the left end of the guide hole 16, and the lateral movement of the auxiliary cam plate 11 is restricted, resulting in the state shown in FIG.

Therefore, as shown in FIG. 1, the swing width of the abutment pin 6, that is, the lateral movement stroke of the main cam plate 10 can be increased by four lengths compared to the case where only the main cam plate is provided.

Next is the channel selection member in which the abutting pin 6 is located at the leftmost position.

8, the left side movement limit position of the main cam plate 10 is reached, and the right inclined part 4b of the main cam plate 10 and the right guide inclined part 18b of the auxiliary cam plate 11 are continuous. When the abutment pin 6 is operated to suppress the channel selection member 8 locked in the rightmost position from the state shown in FIG. Upon contact with the portion 18b, the auxiliary cam plate 11 starts to move laterally to the right, and along with this, the main cam plate 10 also moves laterally in the same direction through the engagement between the regulation hole 19 and the regulation pin 20. move.

When the regulation pin 20 comes into contact with the right side of the regulation hole 19, only the main cam plate 10 moves laterally to the right due to the contact between the abutment pin 6 and the right inclined portion 4b of the main cam plate 10. The engaging protrusion 17 comes into contact with the left end of the guide hole 16, and the auxiliary cam plate 11
The lateral movement of is restricted, resulting in the state shown in Figure 3.

Therefore, in this case as well, the swing width of the abutting pin 6, that is, the lateral movement stroke of the main cam plate 10 can be increased by one length.

Therefore, according to the present invention, the arrangement pitch P of the channel selection members
Even if the frequency is the same as before, the amount of lateral movement of the main cam plate is increased to 7P or more, so if the frequency being received is the same as before, it has the advantage that the tuning accuracy can be improved by that much. .

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main part in a conventional configuration, Figs. 2 to 4 are views of an embodiment of the present invention, and Fig. 2 is a plan view of the main part in a state where the main cam plate and the auxiliary cam plate are in the neutral position. FIG. 3 is a plan view of the main cam plate in a state in which the main cam plate has been moved laterally to the right extreme position, and FIG. 4 is a plan view in which the main cam plate has been moved laterally to the left extreme position. In the figure, 4 is a cam part, 4a is a left inclined part of the cam part, 4b is a right inclined part of the cam part, 6 is an abutment pin, 7 is a frequency storage part,
8 is a channel selection member, 10 is a main cam plate, 11 is an auxiliary cam plate, 1
6 is a guide hole, 17 is an engagement pin, 18a is a left inclined portion, 18
b is a right inclined portion, 19 is a regulation hole, and 20 is a regulation pin.

Claims (1)

[Scope of Claims] 1. The formwork has a frequency storage part and a tuning member that slides in the front and back direction by a suppression operation, and a 7-shaped cam part corresponding to each of the tuning members. a main cam plate that moves laterally in the left and right directions when the frequency storage piece collides with the cam part; and a main cam plate that overlaps with the main cam plate and is movable laterally in the left and right directions, and that is at the left side lateral movement limit position. a left guide slope portion that extends continuously with the left slope portion of the cam portion; and a right guide slope portion that extends continuously with the right slope portion of the cam portion at the right lateral movement extreme position. Equipped with an auxiliary cam plate provided corresponding to each of the cam parts, the auxiliary cam plate is connected to the main cam plate so as to be movable laterally between the lateral movement limit positions on both sides, and When the left inclined part of the cam part of the main cam plate and the left guide inclined part of the auxiliary cam plate are continuous and the main cam plate reaches the rightward lateral movement limit position, the rightward movement of the auxiliary cam plate , and when the right inclined part of the cam part of the cam plate and the right guide inclined part of the auxiliary cam plate are continuous and the main cam plate reaches the leftward lateral movement limit position, the auxiliary cam plate A push button type tuner characterized in that a regulating hole and a regulating pin for regulating lateral movement in the left direction are provided in the formwork and the auxiliary cam plate.