JPH021454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a push-button tuner that has a simple structure, can be obtained at low cost, is effective in miniaturization, and can select many stations.

Conventionally, a support frame is equipped with an operating shaft having a push button, and a pair of tuning shafts located on the left and right sides thereof and having tuning pieces that are screwed into threaded parts and move back and forth, and when the operating shaft is pressed. , one of the tuning shafts is moved forward to hold the forward moving body, and a variable tuning element is operated by abutting a tuning piece provided on the tuning shaft with an operating plate that can freely move back and forth. A push-button tuner configured to perform variable tuning is known, for example, in Japanese Utility Model Application Publication No. 53-43804. However, according to the conventional configuration, the tuning connection of the left and right tuning shafts with respect to the operation shaft is achieved by a separately provided tuning switching mechanism, which requires extra space for the arrangement of the long push buttons. Not only that, but it also had the drawback that it was limited to switching between two bands, for example, the AM band and the FM band, and therefore a single tuner could not have a tuning function for three or more bands.

Therefore, the present application aims to improve such defects, move the tuning axis by a large amount with a small pressing stroke of the operating shaft, make the pressing operation of the operating shaft easier, and downsize the tuner. The embodiment will be described in detail below with reference to the drawings. Figure 1 shows one operating axis and two channel selection axes.
This is an overall plan view in which one set of channel selection mechanisms is provided on a support frame, and other channel selection mechanisms are omitted. , a U-shaped support part to which the central part of an oblong interlocking part 4, which has upward folding pieces 3a, 3b at the front and rear ends and engagement holes 4a, 4b at both ends in the central part of the lower surface, is pivoted. The piece 3 is attached so that it can be rotated freely and fixed in the axial direction by inserting the shaft rod 2 through the folded pieces 3a and 3b. This shaft 2 is
The front part has a shaft part 2a having a non-circular cross section with a part cut in the axial direction, and a driving gear 5 that engages with this shaft part 2a in the rotational direction and moves freely in the axial direction is inserted, and A push button 6 is provided at the rear end. The operating shaft 1 configured in this way is attached to the bottom plate 7c of the support frame 7.
It is rotatably and movably supported by a support piece 7e cut and raised at the front position of the base plate 7e and a rear plate 7b bent upward at the rear edge of the bottom plate 7c, and is fixed at a position forward of the main drive gear 5. A spring 9 is interposed between the stopper 8 and the spring 9 to press the main drive gear 5 backward.
, a spring 11 that presses the front folded piece 3a of the support piece 3 against the stopper 10 and presses the support piece 3 backward; and an operating shaft interposed between the rear plate 7b of the support frame 7 and the push button 6. 1 restoration spring 12
are provided respectively. A pair of tuning shafts 13, 13' forming a pair with the operating shaft 1 have the same configuration,
For convenience of explanation, the specific configuration of one channel selection axis 13 is shown, and the other one is distinguished by adding (').
That is, the tuning shaft 13 consists of an elongated shaft rod 14, and the shaft rod 14 has a threaded portion 15 formed in a horizontal U-shape, and the threaded portion 15 is located between the front and rear pieces 16a and 16b. a guide piece 20 which is supported in a freely movable manner as shown in FIG. The screw part 1
5, an angular channel selection piece 22 with a memory section 21 bulged on its upper surface, and an engaging piece 23 located forward of the guide piece 20, which is rotatable in the rotational direction and fixed in the axial direction. and a driven gear 24 which is located in front of the part 23, moves together in the rotational direction, is movable in the axial direction, can mesh with the main drive gear 5, and has a larger diameter than the main drive gear 5; Uketsuba 25 that comes into contact with the front
and a spring 26 which is interposed between the engagement piece 23 and the driven gear 24 and presses the gear 24 against the receiving flange 25. 13' are located parallel to the left and right sides of the operating shaft 1, and the front and rear plates 7a of the support frame 7,
7b so as to be rotatable and movable back and forth, and between the front plate 7a and the receiver flange 25, 25' is a tuning shaft 13,
13' restoring springs 27, 27' are interposed, and the bottom plate 7c of the support frame 7 is further provided with a guide hole 28 that engages with the tips of the engaging pieces 23, 23' and guides their forward and backward movement. , 28', and guide holes 30, 30' that engage with protrusions 29, 29' provided on the rear pieces of the guide pieces 20, 20' to guide their longitudinal movement.
are formed directly below each channel selection shaft 13, 13'. Reference numeral 31 denotes a lock plate that moves laterally in a direction orthogonal to the operating shaft 1, and is supported on the bottom plate 7c of the support frame 7 through engagement with a long hole 32 and a pin 33. When the tuning shafts 13 to 13' move forward, they act on the locking pieces 23 to 23', causing the locking plate 31 to release its restoring spring 3.
Slanted edge 3 for temporarily imparting lateral movement against 4
A cam piece 37 is formed corresponding to each channel selection shaft. Reference numeral 38 denotes a switching mechanism that alternately blocks the forward movement of the left and right tuning shafts 13, 13', and as shown in FIG. a vertically elongated rocking plate 42 having rising pieces 40, 40' and an arcuate connecting hole 41 at the rear, and T-shaped abutment pieces 43, 43' on the left and right positions of the top piece;
A rotating plate 45 having a protruding shaft 44 on each leg piece, and a pivot shaft 4 that rotatably pivots the intermediate portion of the rotating plate 45 to the bottom plate 7c of the support frame 7 through the mounting hole 39.
6 and a snap spring 47 that maintains the rotating state of the rotating plate 45.
8 is on the bottom plate 7c of the support frame 7, and the rocking plate 42 is located between the pair of left and right guide holes 30, 30', and in the rocking state, the rear edge is located between the pair of guide holes 30, 30'.
furthermore, so that the abutting pieces 18, 18' of the guide pieces 20, 20' located on the left and right sides face the abutting pieces 43, 43' of the rotating plate 45, respectively, in the front-rear direction. The snap spring 47 is attached by engaging the connecting pin 48 in the connecting hole 41, and one end of the snap spring 47 is secured to the protruding shaft 44, and the other end is secured to the bottom plate 7c. The support frame 7 has an upper plate 7.
d, and on the inner surface of this upper plate 7d, fourth and fifth
As shown in the figure, a plate-shaped actuating plate 52 is provided with sleeve pieces 49 at the left and right positions, a support piece 50 extending rearward at the center position of the rear edge, and a wide part 51 at the center position of the front edge. It is attached so as to be slidable in the front-rear direction through engagement between an elongated hole 53 and a pin 54, and the front edge of the wide portion 51 is provided with a magnetic field of a variable tuning element 55 disposed at the front of the support frame 7. Cores 55a are connected. 56 is an elastic spring of the actuating plate 52; 57;
Reference numeral 58 denotes a locking circumferential groove formed before and after the operating shaft 1, and 59 a locking member that selectively engages with the circumferential grooves 57 and 58 to maintain the operating shaft 1 in its restored state and preset state. A spring is provided on the outer surface of the rear plate 7b of the support frame 7.

In one channel selection mechanism shown in FIG. 1, one channel selection shaft 13' located on the right side moves forward and the engagement piece 23' is engaged with the engagement step 36 of the lock plate 31'. and the forward movement state is maintained, and the operation shaft 1 and
a guide piece 20' of the tuning shaft 13' in a forward moving state;
When the other tuning shaft 13 located on the left side is in the restored state, the locking spring 5 is inserted into the circumferential groove 57 of one of the operating shafts 1.
9 is locked, and the swing plate 42 and the swing plate 45 of the switching mechanism 38 are both rotating counterclockwise (the state shown in the position A in FIG. 1),
This state is further shown in FIG. When the push button 6 is pulled forward from this state, the locking spring 59 locks into the other circumferential groove 58, and the driving gear 5 and the driven gear 24' in the forward moving state mesh with each other. In this case, if the teeth of both gears 5 and 24' contact each other on the front and rear surfaces, the main gear 5 moves forward against the spring 9, and the driven gear 24' moves backward against the spring 26'. When the push button 6 is rotated in this state, both gears 5 and 24' are automatically engaged. After the preset condition is established in this way as shown in FIG. 9, when the push button 6 is rotated, one of the tuning shafts 13' rotates accordingly.
The tuning piece 22' moves back and forth on the tuning shaft 13'. This forward and backward movement is guided by the side surface of the tuning piece 22' coming into contact with the inner surface of the guide piece 20', and the rear edge rib 52a of the actuating plate 52 is attached to the tip of the memory section 21' by a spring 56. Since they are in pressure contact, the actuating plate 52 also moves in the front and back direction together with the tuning piece 22', thereby causing the variable tuning element 5 to move forward and backward.
5 is varied to select a desired station.

In this way, one channel selection axis 1 located on the right side
3', after memorizing the desired station by the movement stroke of the tuning piece 22', when the push button 6 is pressed, the locking spring 59 engages with the circumferential groove 57 again and the state shown in FIG. 8 is restored.

Next, when the push button 6 is pressed from this state, as described above, the switching mechanism 38 is moved so that a part of the rear edge of the rotated rocking plate 42 is located on the right side, as shown in the position A in FIG. Since it is placed across the guide hole 30', the guide piece 20' on the one channel selection shaft 13' side, which is in the forward moving state, is moved by its protruding piece 29'.
is prevented from moving forward by the rear edge of the rocking plate 42, so the interlocking piece 4 rotates around the shaft pin 19' of the guide piece 20' whose front end is prevented from moving. Therefore, the guide piece 20 in the left-hand position with the axle pin 16 engaged therewith moves forward with a stroke twice as large as the forward movement stroke of the support piece 3.
Since the front piece 16a of the guide piece 20 is brought into contact with the engagement piece 23 by the restoring spring 27, the shaft rod 14 also moves forward together with the guide piece 20. In this case, the locking piece 23 acts on the inclined edge 35 of the locking plate 31, and a lateral force is temporarily applied to the locking plate 31 in a direction against the spring 34, so that the locking plate 31 is held in the forward moving state. The engagement piece 23' of one channel selection shaft 13' is disengaged from the locking step 36, and the channel selection shaft 13' is moved to the guide piece 20' that is engaged with the interlocking piece 4. It is restored by the restoring spring 27' irrespective of the situation. The storage section 21 of the other tuning shaft 13, which has moved forward together with the operating shaft 1, is in contact with the rear edge rib 52a of the actuating plate 52, which moves backward when the tuning shaft 13' is restored. In this state, the engagement piece 23 is engaged with the engagement step 36 of the lock plate 31, thereby locking the other channel selection shaft 13.
is held in forward motion.

However, when the push button 6 is released from the levered state,
The operating shaft 1 and the guide pieces 20, 2 at left and right positions engaged with the interlocking piece 4 via shaft pins 19, 19'.
0' retreat together, resulting in the state shown in FIG. Next, when the push button 6 is pulled forward from this state as described earlier, the locking spring 59 switches from the circumferential groove 57 to the circumferential groove 58 and locks it, and the main drive gear 5 is moved to the left position where it is held in the forward movement state. The preset state is maintained by meshing with the driven gear 24 of the tuning shaft 13. When the push button 6 is rotated from this state, the rotation is transmitted to the tuning shaft 13, and since the driven gear 24 is formed with a larger diameter than the main driving gear 5, the tuning shaft 13 rotates minutely. , the tuning piece 22 moves back and forth on the shaft 14, thereby finely varying the variable tuning element 55 via the operating plate 52, selecting another station, and selecting the selected station. 22 travel strokes. Next, the switching operation of the switching mechanism 38 will be explained. FIGS. 1A to 1D show the operating process of the switching mechanism 38, which is switched by one reciprocating motion of the operating shaft 1.

That is, in the state shown in FIG. When the piece 18 moves forward and collides with the contact piece 43 of the rotating plate 45 facing it,
As shown in FIG. 4B, the rotating plate 45 is reversed clockwise so that the tips of its legs collide with one of the rising pieces 40', whereby the swinging plate 42 receives a clockwise rotating force. . In this state, when the push button 6 is released and the left guide piece 20 engages with the interlocking piece 4 and retreats together with the operating shaft 1, the protruding piece 29 moves toward the rocking plate 4 as shown in FIG. With the guide piece 20 fully restored, the rocking plate 42 is moved clockwise so that its rear edge crosses the left guide hole 30, as shown in FIG. This state is maintained by the snap spring 47. In this manner, the switching mechanism 38 is alternately reversed and switched in the left and right directions every time the operating shaft 1 moves back and forth.

After storing desired stations on all the tuning axes installed on the support frame 7 in this way, pressing the push button 6 at any position to move the operating axis 1 forward allows forward movement. Either one of the tuning shafts 13 to 13' in the state moves forward together, and the memory sections 21 to 21' of the tuning pieces 22 to 22' provided thereon and the rear edge rib 52a of the operating plate 52 The station stored in the channel selection pieces 22 to 22' is reproduced via the variable tuning element 55 by the contact pressure contact with the channel selection pieces 22 to 22'.

Furthermore, in the present invention, a control switch 60 is provided at a suitable location of the support frame 7, for example on the top plate 7d, and is actuated by the stopper 10 at the time of presetting by utilizing the movement stroke of the operating shaft 1 to move from the restoring state to the presetting state. There is. This control switch 60 is used, for example, as a signal source to short-circuit the AFC circuit, close the tuning center point detection function circuit, or control both of them together, so that the AFC circuit is shorted or the tuning center point detection function circuit is closed during the preset operation. Since it operates, the tuning center point can be derived extremely easily, which is convenient for preset operations.

Note that in the above embodiment, the main drive gear 5 is connected to the spring 9.
springs 26, 2 are provided between the engaging pieces 23, 23' and the driven gears 24, 24'.
The front surfaces of the driven gears 24, 24' are pressed into contact with the receiving flanges 25, 25', respectively, through the shafts 14, 14' to enable rearward movement relative to the shaft rods 14, 14'. When the mountains from 24' to 24' come into contact,
Although the case is shown in which both gears are configured to escape from each other in the front and back direction, when the driven gears 24 and 24' are configured to be able to move backward, the main drive gear 5 is fixed to the shaft rod 2, Further, when the main driving gear 5 is configured to be able to move forward, the driven gears 24 and 2
4' may of course be fixed to the shaft rods 14, 14', respectively.

11 to 15 show another embodiment in which the guide piece is supported so as to be movable back and forth with respect to the support frame, and the attachment relationship between the support piece and the tuning shaft is changed. That is, FIG. 14 shows the guide pieces 20, 20' which are supported by the support frame 7 so as to be movable back and forth in correspondence with the respective tuning shafts 13, 13'. The front edge has guide holes 28, 2 formed in the bottom plate 7c of the support frame 7 at the tip bent downward.
A tongue piece 63 having an engaging part 62 that engages with 8' is
At its rear edge, a pair of upward supporting pieces 64 are provided, which are opposed to each other so that the shaft rods 14, 14' can be inserted between them.
64, which is located between the branch pieces 64, 64 and is bent downward, and the tip thereof engages with the guide holes 30, 30' formed in the bottom plate 7c of the support frame 7, and the switching mechanism 3
A tongue piece 66 having an engaging portion 65 that contacts the rear edge of the swing plate 42 of No. 8 further contacts the contact pieces 43, 43' of the swing plate 45 of the switching mechanism 38 at the center position. A shaft pin 68 is provided to connect the abutting piece 67 and the interlocking piece 4, respectively, and these are attached to the support frame 7 as shown in FIG.

Further, FIG. 15 shows the support piece 3 in this embodiment, and the support piece 3 has a pair of stop pieces 69, 69 which are cut out and come into contact with the stopper 10 in the preset state. The shaft 2 of the operating shaft 1 is opposed to the shaft 2 so as to intervene between the two. The front folded piece 3a of this support piece 3 has
Circumferential grooves 57, 5 located in the front and rear provided in the shaft rod 2
8 is provided with a locking spring 59 that selectively locks it, and is configured as shown in FIG. Furthermore, 70
presses the support piece 3 backward to release the front folded piece 3a.
The spring 71 that presses against the stopper 10 is a spring for restoring the operating shaft 1, and its action is the same as in the first embodiment.

Further, in the above embodiment, the support piece 3 is attached to the shaft rod 2 so as to move together in the front and back direction, but as shown in FIG. A recess 72 into which the shaft rod 2 can be inserted is cut out in the middle part, and a hook 73 is provided at the upper end, so that the support piece 3 can be inserted into the recess 71 as shown in FIG. In this state, the hook portion 73 is attached to the support frame upper plate 7d through a long hole (not shown).
Of course, it is also possible to adopt a structure in which it is supported so as to be movable back and forth by engaging the two.

Furthermore, in the above-described configuration, the operating plate is formed with an inclined edge that abuts the memory sections 21 and 21' of the channel selection pieces 22 and 22', respectively, and the inclined edge and the memory section 2 are formed on the operating plate.
1, 21' It goes without saying that the variable tuning element may be changed by moving the actuating plate laterally in a direction perpendicular to the operating axis by the collision thereof.

In each of the above-mentioned FIGS. 1 to 17, the pressing stroke of the operation shaft 1 is expanded to
3', a horizontally rotatable interlocking piece 4 provided on a supporting piece 3 that co-moves with the operating shaft 1 in the front-rear direction and is freely rotatable in the rotational direction, and a horizontally rotatable interlocking piece 4 that moves with the operating shaft 1 in the front-rear direction and is freely rotatable in the rotational direction;
3' in the front-rear direction, is freely rotatable in the rotational direction, and is engaged and connected to the ends of the interlocking piece 4 through the engagement of the engagement holes 4a, 4b and the shaft pins 19, 19'. 18 to 21 show a case in which the expansion mechanism is provided on a support piece 3 that moves together with the operating shaft 1 in the front and rear directions and is freely rotatable in the rotation direction. a horizontally rotatable pinion 80; a guide piece 82 having racks 81, 81' that move together with the tuning shafts 13, 13' in the front-rear direction, are free in the rotational direction, and mesh with the pinion 80;
82' is shown, and the same reference numerals as in FIGS. 1 to 10 indicate the same members.

However, according to the structure of the lever, when the push button 6 is pressed and the pinion 80 is moved forward together with the shaft rod 2, one of the guide parts, for example, the guide part 82 located on the right side, is moved by the switching mechanism 38. Therefore, the forward movement is blocked, so the easy 8
1', the pinion 80 is guided and moved forward while rotating horizontally, so that the guide piece 82 located on the left side of the operating shaft 1, which has a rack 81 that meshes with the pinion 80, moves forward while rotating horizontally. 1
The front piece 16a of this guide piece 82 moves forward with a stroke twice as long as the pressing stroke.
Since the locking piece 23 is in contact with the restoring spring 27, the shaft rod 2 also moves forward together with the guide piece 82, and the rest of the action is shown in FIGS. 1 to 10. This is exactly the same as in the example shown.

Since the present application is configured as described above, it is possible to select many stations in one receiving band, and for example, a pair of tuning axes in a set of tuning mechanisms can have two different channels. A station in the receiving band can be stored in a pair of tuning axes in another set of tuning mechanisms, and stations in two different receiving bands can be stored, so that many stations in the receiving band can be selected. It is possible to provide a tuner that can be used for many purposes, preset operations can be performed easily and precisely, and since the mesh between the main gear and the driven gear is released during the tuning operation, it is easy to press the button during the tuning operation. The channel selection axis is not rotated by any amount of turning force, so there is no risk of channel selection errors, and the push button protrudes forward from the arrangement position of other push buttons during preset, so the preset It is easy to operate, the driven gear has a larger diameter than the main gear, so the variable tuning element can be finely adjusted, and the tuning axis can be moved with a stroke that is twice the movement stroke of the operating axis. When the movement stroke of the tuning axis is made equal to that of the conventional one, there is an advantage that the distance from the rear surface of the support frame to the protruding end surface of the push button can be shortened, and the overall depth dimension can be shortened. This invention is particularly useful as a push-button tuner for multiple bands.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is an overall plan view with some parts omitted, and FIG. 2 is a section taken along A-A in FIG.
3 is a sectional view taken along the line B-B in FIG. 1, FIG. 4 is an inner view of the upper plate with the actuating plate, and FIG. FIG. 6 is a perspective view of the guide piece, FIG. 7 is an exploded perspective view of the switching mechanism, FIG. 8 is a partial plan view of FIG. 8 is a plan view of a preset state, FIG. 10 is a plan view of a channel selection switching state corresponding to FIG. 8, FIG. 11 is a plan view of another embodiment corresponding to FIG. 8, and FIG. 12 is a plan view of another embodiment corresponding to FIG. 11 is a sectional view taken along the line D-D in FIG. 11, FIG. 13 is a sectional view taken along the line E-E in FIG. 11, FIG. 14 is a perspective view of the guide piece in the embodiment shown in FIG. 11, and FIG. FIG. 16 is a perspective view of another embodiment corresponding to FIG. 13, FIG. 17 is a perspective view of the support piece in the embodiment of FIG. 16, and FIG. 19 is a sectional view taken along line FF in FIG. 18, FIG. 20 is a sectional view taken along line GG in FIG. 18, and FIG. 21 is a sectional view taken along line GG in FIG. 18. FIG. 3 is a perspective view of a guide piece in an example. In the figure, 1 is the operating shaft, 3 is the support piece, 4 is the interlocking piece, 5 is the main drive gear, 6 is the push button, 7 is the support frame, 8 is the stop piece, 10 is the stopper, and 13 and 13' are the tuning shafts. ,
15, 15' are screw parts, 18, 18' are abutment pieces, 2
0 and 20' are guide pieces, 21 and 21' are storage parts, and 2
2, 22' are tuning pieces, 23, 23' are engaging parts, 2
4, 24' are driven gears, 25, 25' are receiver flange, 2
8, 28', 30, 30' are guide holes, 31 is a lock plate, 37 is a cam piece, 38 is a switching mechanism, 40, 4
0' is a rising piece, 42 is a rocking plate, 43, 43' are contact pieces, 45 is a rotating plate, 52 is an actuating plate, 55 is a variable tuning element, 57, 58 are circumferential grooves, and 59 is a locking spring. ,
60 is a control switch, 64 is a branch piece, 66 is a tongue piece,
67 is a matching piece, 69 is a stop piece, 80 is a pinion, 8
1 and 81' are racks, and 82 and 82' are guide pieces.

Claims (1)

[Scope of Claims] 1. The support frame includes an operating shaft having a starting gear, a tuning piece located on the left and right sides of the operating shaft that is screwed into a screw portion and moves back and forth, and a driven gear that can mesh with the main gear. When the operation shaft is pressed,
The variable tuning element is varied by moving one of the tuning shafts forward and holding the forward motion state with a lock plate, and by bringing the operating plate into contact with the tuning piece of the tuning shaft in the forward motion state. In the push-button tuner configured as above, when the operating shaft is moved forward from the restoring position, an enlargement mechanism that enlarges the forward movement stroke and transmitting it to the tuning shaft, and the operating shaft moves between the restoring position and the forwarding position There is a switching mechanism that switches every time it makes a reciprocating motion between the left and right channels, allowing forward movement of one side of the tuning axis and allowing forward movement of the other. and a holding mechanism for holding the operation shaft relative to the support frame at a preset position, and the main drive gear is configured to mesh with the driven gear of the tuning shaft in the forward movement state at the preset position. Features a push-button tuner. 2. A push-button tuner according to claim 1, comprising an actuating plate movable in the front-back direction. 3. The push-button tuner according to claim 1, wherein the actuating plate is movable in a direction orthogonal to the operating axis. 4. The enlarging mechanism includes a horizontally rotatable interlocking piece provided on a support piece that moves together with the operating shaft in the forward movement direction, and an end portion of the interlocking piece that is able to move together with the tuning axis in the forward movement direction. A push-button tuner according to claim 1, 2 or 3, comprising a guide piece that is engaged and connected. 5. The expansion mechanism is provided with a horizontally rotatable pinion provided on a support piece that moves together with the operation shaft in the forward movement direction, and a guide that can move together with the tuning shaft in the forward movement direction and has a rack that meshes with the pinion. A push-button tuner according to claim 1, 2 or 3, which is constructed from a piece. 6. Claim 1, wherein the holding mechanism is comprised of a pair of circumferential grooves provided in front and behind the operating shaft, and a locking spring that is attached to a support frame and selectively locks with the circumferential groove. The push-button tuner according to item 2, 3, 4, or 5. 7. The holding mechanism includes a pair of circumferential grooves provided in front and behind the operating shaft, and a locking spring that is attached to a support piece that moves together with the operating shaft in the forward movement direction and that selectively engages the circumferential groove. Claims 4 or 5 as constructed
Push-button tuner as described in section. 8 A pair of tuning shafts including an operating shaft having a main drive gear on a support frame, a selection piece located on the left and right sides of the operating shaft that is screwed into a threaded part and moves back and forth, and a driven gear that can mesh with the main drive gear. When the operating shaft is pressed,
The variable tuning element is varied by moving one of the tuning shafts forward and holding the forward motion state with a lock plate, and by bringing the operating plate into contact with the tuning piece of the tuning shaft in the forward motion state. In the push-button tuner configured as above, when the operating shaft is moved forward from the restoring position, an enlargement mechanism that enlarges the forward movement stroke and transmitting it to the tuning shaft, and the operating shaft moves between the restoring position and the forwarding position A switching mechanism that switches each time it makes a reciprocating motion between the left and right channels to allow forward movement of one of the left and right channel selection axes and prevent the other from moving forward; a holding mechanism for holding the operating shaft relative to the support frame at a preset position, and configured to engage the main gear and the driven gear of the tuning shaft in a forward moving state at the preset position; A push-button tuner characterized in that the diameter of the driven gear is larger than the diameter of the main drive gear. 9 A pair of tuning shafts including an operating shaft having a driving gear on a support frame, a tuning piece located on the left and right sides of the operating shaft that is screwed into a threaded part to move back and forth, and a driven gear that can mesh with the driving gear. When the operating shaft is pressed,
The variable tuning element is varied by moving one of the tuning shafts forward and holding the forward motion state with a lock plate, and by bringing the operating plate into contact with the tuning piece of the tuning shaft in the forward motion state. In the push-button tuner configured as above, when the operating shaft is moved forward from the restoring position, an enlargement mechanism that enlarges the forward movement stroke and transmitting it to the tuning shaft, and the operating shaft moves between the restoring position and the forwarding position A switching mechanism that switches each time it makes a reciprocating motion between the left and right channels to allow forward movement of one of the left and right channel selection axes and prevent the other from moving forward; a holding mechanism for holding the operating shaft relative to the support frame at a preset position, and configured to engage the main gear and the driven gear of the tuning shaft in a forward moving state at the preset position; At least one of the driving gear and the driven gear is movable in the axial direction within a limited range with respect to the operation axis or the tuning axis, and is always biased in a direction in which it approaches the other gear. Push-button tuner. 10 A pair of tuning shafts including an operating shaft having a main drive gear on a support frame, a tuning piece located on the left and right sides of the operating shaft that is screwed into a threaded part to move back and forth, and a driven gear that can mesh with the main drive gear. When the operating shaft is pressed, one of the tuning shafts is moved forward and its forward movement state is held by a lock plate, and the operating board is attached to the tuning piece of the tuning shaft that is in the forward movement state. In a push-button tuner configured to vary a variable tuning element by abutting each other, when the operation shaft is moved forward from a resting position, the expansion mechanism expands the forward movement stroke and transmits it to the tuning shaft. , a switching mechanism that switches each time the operating shaft makes one reciprocating movement between the restoring position and the forward movement position to permit forward movement of one of the left and right tuning axes and prevent forward movement of the other; a holding mechanism that holds the operating shaft relative to the support frame at a restoring position of the shaft and a preset position where the shaft is moved rearward; 1. A push-button tuner comprising a support frame equipped with a control switch configured to mesh with a gear and actuated when the operating shaft moves to a preset position. 11. The push-button tuner according to claim 9, wherein the control switch is a switch that short-circuits the AFC circuit. 12 Claim 9, wherein the control switch is a switch that causes the tuning center point detection function circuit to function.
Push-button tuner as described in section.