JPS5918738Y2 - Friction member of friction transmission mechanism in tuner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to, for example, a push-button type tuner suitable for a thin design, and aims to provide a push-button type tuner with better manual tuning adjustment accuracy.

The present invention will be described below with reference to the drawings showing the embodiments.A is a lid frame, which is composed of a bottom plate A', a front plate A// having a U-shaped cross section, and a single-piece upper plate A'''.

Reference numeral 1 shows the tuning member seen from the back, and the tuning member is supported by the cut-and-raised piece 2 cut and raised on the bottom plate A' and the front plate A//, and is slidably mounted on the lid frame. A storage member 3 for converting the reception frequency into a rotational position and storing the frequency is pivotably mounted 4 on the surface opposite to the back surface of the device 1, that is, the surface on the side of the bottom plate A'.

5 is a push button fixed to the channel selection member; 6 is a shaft rod whose end forming a collar 6' is inserted into the inside of the push button 5, and whose other end is inserted into the lid frame A; It is.

Reference numeral 7 designates a return spring for the channel selection member 1 loosely fitted into the shaft rod.

Numeral 8 is a shaft pin protruding from the back surface of the channel selection member, which faces a spear-shaped elongated hole 9 drilled in the upper plate.

Reference numeral 10 denotes a channel selection cam plate, that is, a movable member, which is slidably installed perpendicular to the rear channel selection member of the lid frame A.

The cam plate 10 has a position opposite to the memory pin 11 protruding from the memory member 3, which acts on the memory pin 11 to set the frequency memory member 3 at a set angle when the channel selection member 1 is pressed and moves forward. A V-shaped cam portion 12 is formed that urges the cam plate 10 to apply a lateral movement stroke corresponding to .

Reference numeral 20 denotes a clutch actuation cam plate that is slidably mounted on the front side of the lid frame in the longitudinal direction thereof, and is located at a position facing a protrusion (not shown) formed on the channel selection member. When the channel selection member 1 is pressed and moves forward, a V-shaped cam portion 21 acts with the protrusion to apply a lateral stroke to the cam plate 20 necessary for disengaging the clutch of the manual synchronization mechanism. It is formed.

Reference numeral 30 denotes a band switch switching cam plate which is installed laterally movably behind the channel selection cam plate 10 on the cover frame, and has a tongue piece 31 that protrudes from the tip of the channel selection member 1 when the channel selection member 1 is pushed forward.
A cam portion 32 is formed so as to move laterally to switch a band switch (not shown) by the collision of the two.

40 is a variable inductance tuning element, and the tuning cam plate 1
The magnetic core 41 on the cam plate 10 moves along with the lateral movement of the cam plate 10.

50 is a manual tuning adjustment section.

As shown in FIG. 6, 51 is a rack plate rotatably attached to a shaft pin a provided on the channel selection cam plate 10, and includes a clutch mechanism frame 52 and a variable tuning unit integrated with the mechanism frame 52. It meshes with a spur gear 55 fixed on a collar 54' that is loosely fitted onto a rotating shaft 54 that is supported between the element frame 53 and the element frame 53.

b is a bullet ray for removing play in the pivoting part of the rack plate 51, C
is a leaf spring that applies a biasing force to the rack plate 51 in order to eliminate the backlash of meshing between the rack plate and the spur gear 55;
One end is fixed to the rack plate 51, and a rack plate 51 is elastically connected to the free end.

In addition to the spur gear 55, a friction wheel 56 is fixed on the collar 54'.

Reference numeral 57 denotes a driving spur gear provided on the shaft of a known Oldham coupling piece 68 that interlocks with a manual tuning adjustment shaft (not shown), and meshes with the driven spur gear 58 provided on the frame 52.

Reference numeral 59 denotes a cup-shaped engagement portion in which an axial slit 64 is formed on the gear 58, and as shown in FIG. A friction shaft 63 formed with two engaging corners 62
is engaged.

Reference numeral 65 denotes an L-shaped clutch actuation lever, which is rotatably mounted on the tip of the lever support shaft 66 so that one end engages with the friction shaft and the other end comes into contact with the clutch actuation cam plate 20. It has become.

A coil spring 67 is loosely fitted onto the lever support shaft 66 and is engaged with one end of the lever 65 so as to press the friction shaft 63 against the friction wheel 56 .

The surface of either the friction wheel 56 or the friction part 60 has some elasticity, and the other surface is flat and smooth as shown in FIG. 7 (for example, a cross-sectional view of the friction wheel). By means such as knurling or chemical means,
A plurality of recesses 70 are formed leaving a flat portion to make the surface rough.

In the above-described configuration, first, the tuning operation for reproducing the stored frequency will be described. When the push button 5 is pressed against the return spring 7, the tuning member 1 moves forward with respect to the lid frame A, and the tuning operation is performed to reproduce the stored frequency. A not-shown protrusion on the station member 1 comes into contact with the cam portion 21 of the clutch actuating cam plate 20, and the cam plate 20 moves to the right in FIG.

As shown in FIG. 4, one end of the cam plate 20 is in contact with one end of the clutch actuating lever 65, so that the lever 65 rotates in the direction of the arrow against the coil spring 67 as the cam plate 20 moves.

Along with this, the friction shaft 6 engaged with the lever 65
3 is tilted in a direction away from the friction wheel 56, and the rotation restriction of the friction wheel 56 is released and the friction wheel 56 becomes freely rotatable.

When the pressure is continued after that, the memory pin 11 on the memory member 3 comes into contact with the cam part 12 of the channel selection cam plate 10,
The cam plate 10 is laterally moved until it reaches the rotation angle of the memory member 3.

During this time, the clutch actuating cam plate 20 is still moved to the right and the friction wheel 56 is in a freely rotatable state, so that as the channel selection cam plate 10 moves laterally, the rack plate 51 and the spur gear Since the friction wheel 56 can be rotated via the friction wheel 55, the lateral movement of the channel selection cam plate 10 is not restricted in any way and follows the rotational position of the memory pin.

After the forward movement of the channel selection member 1 is blocked, when the pressure is released, the channel selection member 1 returns to its original position due to the return spring.

During the return, a protrusion (not shown) on the channel selection member comes off from the cam portion 21 of the clutch actuation cam plate 20, so the cam plate 20 is returned together with the clutch actuation lever 65 by the coil spring 67, and the friction The shaft 63 comes into pressure contact with the friction wheel 56, so that the lateral movement of the channel selection cam plate 10 is restricted, and the reproduced reception frequency is maintained.

Next, referring to the manual tuning adjustment method, when the manual adjustment shaft (not shown) is rotated, the adjustment is performed via the driving spur gear 57, the driven spur gear 58, the friction shaft 63, the friction wheel 56, the spur gear 55, and the rack plate 51. By moving the channel selection cam plate 10 laterally, the variable inductance tuning element 40 can be varied to receive a desired station.

Also, while searching for a desired station, if you do not notice that the tuning cam plate 10 is moving horizontally to the maximum and you continue to rotate the manual adjustment shaft, friction is applied to release the over-rotation. car 5
6 and the friction portion 20 are designed to cause slippage.

As described above, according to the present invention, when the friction wheel 56 and the friction part 60 slip, the protrusion 7 formed by the recess 70
Since the tip of 1 is flat, there is less wear on the friction part of the other side, and it can withstand long-term use.

Furthermore, since no scratches occur, smooth manual adjustment can be performed, and a tuner with excellent manual tuning adjustment accuracy can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the push-button tuner according to the present invention, and FIG. 1 is a partially cutaway plan view, FIG. 2 is a left side view with some parts omitted, FIG. 3 is a right side view, and FIG. The figure shows line IV- in Figure 1.
5 is a plan view of the friction shaft, FIG. 6 is a sectional view taken along line VIVI in FIG. 1, and FIG. 7 A is a knurled friction member. An enlarged cross-sectional view of the surface. In the figure, A is a lid frame, 1 is a tuning member, 10 is a movable member (cam plate), 40 is a variable inductance tuning element, 41 is a magnetic core, 50 is a manual tuning adjustment section, 51 is a rack plate, and 56 is a friction wheel. , 60 is a friction portion, and 63 is a friction shaft.

Claims (1)

[Scope of utility model registration request] 1. A friction member for a friction transmission mechanism in a tuner, characterized in that a plurality of recesses are formed in a member that is flat from the surface so that a flat portion thereof remains.