JPS648490B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application provides a push-button tuner that has a simple structure, can be obtained at low cost, is effective for miniaturization, and can select stations with many different frequency bandwidths. It is something to do.

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 of the operating shaft and having tuning pieces that are screwed into threaded parts and move back and forth, and when the operating shaft is pressed. The variable tuning element is made variable by moving one of the tuning shafts forward and maintaining that forward movement state, and by abutting the tuning piece provided on that tuning shaft with an actuating plate that can move back and forth. A push-button tuner configured to perform channel selection is known, for example, in Japanese Utility Model Application Publication No. 53-43804. However, according to the conventional configuration, the selective connection of the left and right channel selection axes with respect to the operating axis is achieved by a separate selection switching mechanism, which requires extra space for the arrangement of the push buttons. Instead, it was limited to switching between two bands, for example, the AM band and the FM band, and therefore had the drawback that 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 in which the middle part of an oblong interlocking piece 4, which has upward folding pieces 3a and 3b at the front and rear ends and engagement holes 4a and 4'a at both ends in the center 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 front plate 7 of the support frame 7.
a and the rear plate 7b so as to be rotatable and movable back and forth, and between the front plate 7a and the main driving gear 5, there is a regulating part 8 which is cut out from the bottom plate 7c of the support frame 7 and extends upward. A spring 9 is interposed between the rear plate 7b and the push button 6, and a spring 10 for restoring the operating shaft 1 is interposed between the rear plate 7b and the push button 6. A pair of channel selection shafts 11 and 11' that form a pair with the operation shaft 1 have the same configuration, and for convenience of explanation, the specific structure of one channel selection shaft 11 is shown, and the other one is distinguished by adding '. do. That is, the channel selection shaft 11 is a long shaft rod 12.
The shaft rod 12 includes a threaded portion 13 and front and rear pieces 14a, 14b formed in a horizontal U-shape.
A downwardly directed abutment piece 15 and an upwardly directed shaft pin 16 that engages with the engagement hole 4a of the interlocking piece 4 are supported in a freely movable manner so that the threaded portion 13 is located therebetween. a square selection piece 18 which is screwed onto the threaded part 13 and has a bulging storage part 18a on its upper surface; an engaging piece 19 that is fixed in the core direction; and an engaging piece 19 that is located in front of the piece 19, moves together in the rotational direction, is free in the axial direction, can mesh with the main drive gear 5, and has a larger diameter than the engaging piece 19. a driven gear 20, a receiving flange 21 that contacts the front surface of the gear 20, and a spring 22 that is interposed between the engaging piece 19 and the driven gear 20 and presses the gear 20 against the receiving flange 21. The channel selection shafts 11 and 11' configured in this way are provided on the operating shaft 1, respectively.
is located parallel to the left and right sides of the support frame 7, and is rotatably supported by the front and rear plates 7a, 7b of the support frame 7 so as to be movable back and forth,
Springs 23, 23' for restoring the tuning shafts 11, 11' are interposed between the front plate 7a and the receiver flange 21, 21', and the bottom plate 7c of the support frame 7 includes:
Guide holes 24, 24' that engage with the tips of the engaging pieces 19, 19' to guide their forward and backward movement, and projecting pieces 25, 2 provided on the rear pieces of the guide pieces 17, 17'.
a guide hole 26 that engages with 5' and guides its longitudinal movement;
26' are formed directly below each channel selection shaft 11, 11'. Reference numeral 27 denotes a lock plate that moves laterally in a direction perpendicular to the operating shaft 1, and is supported on the bottom plate 7c of the support frame 7 through engagement with a long hole 28 and a pin 29. When the tuning shafts 11 to 11' move forward, they act on the engaging pieces 19 to 19' and cause the lock plate 27 to have its spring 30
Slanted edge 31 that temporarily provides lateral movement against
A cam piece 33 having a locking step 32 for locking the engaging pieces 19 to 19' is formed corresponding to each channel selection shaft. 34 is a switching mechanism that alternately blocks the forward movement of the left and right tuning shafts 11, 11', and as shown in FIG.
5, a vertically long rocking plate 38 having a pair of rising pieces 36, 36' facing each other on the left and right in the center of the front wide part, and an arcuate connecting hole 37 at the rear, and a T-shaped top piece. A rotating plate 41 having abutment pieces 39, 39' on the left and right positions and a protruding shaft 40 on each leg piece, and an intermediate portion of this rotating plate 42 are rotated to the support frame 7 through the mounting hole 35. The switching mechanism 34 is composed of a pivot shaft 42 that is rotatably mounted, and a snap spring 43 that maintains the rotating state of the rotating plate 41.
The rocking plate 38 is positioned between the pair of left and right guide holes 26, 26' on the bottom plate 7c of the rocker, and in a rocking state, the rear edge alternately closes the pair of guide holes 26, 26'. Furthermore, the guide pieces 1 located on the left and right sides
The abutment pieces 15 and 15' of 7 and 17' are connected to rotating plates 41, respectively.
The snap spring 43 is attached by engaging the connecting pin 44 in the connecting hole 37 so as to face the contact pieces 39, 39' in the front-rear direction, and one end of the snap spring 43 is attached to the protruding shaft 40, and the other end is attached to the bottom plate. 7c, respectively. The support frame 7 is provided with an upper plate 7d,
On the inner surface of the upper plate 7d, as shown in FIGS. 4 and 5, sleeve pieces 45 are provided at left and right positions, a branch piece 46 extending rearward is provided at the center of the rear edge, and a wide portion 47 is provided at the center of the front edge.
A plate-shaped actuating plate 48 integrally provided with each of the long holes 4
A variable tuning element 51 disposed at the front of the support frame 7 is attached to the front edge of the wide portion 47 so as to be slidable in the front-rear direction through engagement between the wide portion 9 and the pin 50.
magnetic cores 51a are connected to each other. 52 is an elastic spring of the actuating plate 48. In one channel selection mechanism shown in FIG. 1, one channel selection shaft 11' located on the right side moves forward, and the engagement piece 19' is engaged with the engagement step 32 of the lock plate 27. and the forward movement state is maintained, and the operation shaft 1, the guide piece 17' of the tuning shaft 11' which is in the forward movement state, and the other tuning shaft 11 located on the left side are respectively returned to the restored state. , and both the swing plate 38 and the rotating plate 41 of the switching mechanism 34 are in a state of rotating counterclockwise (the state shown in position A in FIG. 1). As shown in FIG. 8, when the push button 6 is rotated from this state, one of the tuning shafts 11' rotates due to the engagement between the main gear 5 and the driven gear 20', and accordingly, the tuning piece 18' is rotated. moves forward and backward on the tuning axis 11'. This movement in the back and forth direction is guided by the side surface of the channel selection piece 18' coming into contact with the inner surface of the guide piece 17', and the tip of the storage section 18'a is guided by the operation plate 4.
Since the rear edge rib 48a of 8 is in pressure contact with the spring 52, the operation plate 4 is pressed together with the tuning piece 18'.
8 also moves back and forth, thereby varying the variable tuning element 51 and memorizing a desired station.

In this way, one channel selection axis 1 located on the right side
1', after memorizing the desired station by the moving stroke of the tuning piece 18', when the push button 6 is pressed, the switching mechanism 34 is rotated as shown in position A in FIG. Since a part of the rear edge of the oscillating plate 38 that has moved is placed in a state where it crosses the guide hole 26' located on the right side, the guide portion on the side of the tuning shaft 11' that is in the forward moving state The piece 17' is the protruding piece 2.
5' is prevented from moving forward by the rear edge of the rocking plate 38, so the interlocking piece 4 uses the shaft pin 16' of the guide piece 17', which is prevented from moving forward, as a fixing point. The guide piece 17 on the left side, which has the shaft pin 16 that engages with it, moves forward with a stroke that is twice the forward movement stroke of the support piece 3. Moving. Since the engagement piece 19 is brought into contact with the front piece 14a of the guide piece 17 by the restoring spring 23, the shaft rod 2 also moves forward together with the guide piece 17. In this case, the engaging piece 19 acts on the inclined edge 31 of the lock plate 27, and a lateral force is temporarily applied to the lock plate 27 in a direction that opposes the spring 30, so that the lock plate 27 is held in the forward moving state. The engagement piece 19' of one channel selection shaft 11' is disengaged from the locking step 32, and the channel selection shaft 11' is moved to the guide piece 17' that is engaged with the interlocking piece 4. It is restored by the restoring spring 23' regardless of the situation. The memory piece 18a of the other tuning shaft 11 that has moved forward together with the operating shaft 1 is brought into contact with the rear edge rib 48a of the operating plate 48 that moves backward as the one tuning shaft 11' is restored. In this state, the other tuning shaft 11 is held in the forward movement state due to the engagement between the engagement piece 19 and the locking step 32 of the lock plate 27, and this time, as shown in FIG. The other driven gear 20 meshes with the gear 5. In this case, when the peaks of both gears 5 and 20 come into contact with each other, the driving gear 5 moves forward against the spring 9, and the driven gear 20 moves backward against the spring 22, and their meshing does not occur. However, by rotating the main drive gear 5, the meshing is automatically performed.

When the push button 6 is released from the state shown in FIG.
Guide pieces 1 at left and right positions engaged through 6'
7 and 17' are both moved backward, and the main drive gear 5 and the driven gear 20 maintain their meshing state. Next, when the push button 6 is rotated from this state, the rotation is transmitted to the tuning shaft 11, and the driven gear 20 is smaller than the main gear 5.
is formed with a large diameter, so that the tuning axis 11
rotates finely, and the tuning piece 18 moves back and forth on the shaft rod 12. As a result, the variable tuning element 51 is finely varied via the operating plate 48, and the selection of another station is made. The station is memorized by the movement stroke of the selection piece 18.

Next, the switching operation of the switching mechanism 34 will be explained. FIGS. 1A to 1D show the operating process of the switching mechanism that is switched by one reciprocating motion of the operating shaft 1.
That is, in the state shown in FIG. When the rotating plate 41 moves forward and collides with the abutment piece 39 of the rotating plate 41 facing it, the rotating plate 41 is reversed clockwise as shown in FIG. ', and as a result, the rocking plate 38 receives a clockwise rotational force. In this state, when the push button 6 is released and the left guide piece 17 engages with the interlocking piece 4 and retreats together with the operating shaft 1, the protruding piece 25 moves toward the rocking plate 38 as shown in FIG. The guide piece 17 is moved backward while slidingly touching the side edge of the guide piece 17, and with the guide piece 17 fully restored,
As shown in FIG. 1 D, the rocking plate 38 is tilted clockwise so that its rear edge crosses the left guide hole 26.
This state is maintained by a snap spring 43. In this way, the switching mechanism 34 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 11 to 11' in the state moves forward together, and the storage section 18a of the tuning pieces 18 to 18' provided thereon is moved forward.
The stations stored in the tuning pieces 18 to 18' are reproduced via the variable tuning element 51 by the abutment and pressure contact between the rear edge ribs 48a of the operating plate 48 and the channels 18a to 18a'.

Note that in the above embodiment, the main drive gear 5 is connected to the spring 9.
is in pressure contact with the regulating part 8 provided on the bottom plate 7c of the support frame 7, allowing movement only in the forward direction with respect to the shaft rod 2, and the engaging parts 19, 19' and the driven gear 20,
Spring 22, 22' is interposed between the receiving flange 21, 20' and the front surface of the driven gear 20, 20', respectively.
1' to enable movement only backwards with respect to the shaft rods 12, 12', and when the gears of the main drive gear 5 and the driven gears 20 to 20' come into contact with each other, both gears move toward each other in the longitudinal direction. Although the case is shown in which the driven gears 20 and 20' are configured to be able to move backwards, the main drive gear 5 is fixed to the shaft rod 2, and the main drive gear 5 is moved forward. Of course, when the driven gears 20 and 20' are configured to be movable, the driven gears 20 and 20' may be fixed to the shaft rods 12 and 12', respectively.

Furthermore, in the first embodiment, the guide pieces 17 and 17' each having a horizontal U-shape are freely supported on the rods 12 and 12' of the tuning shafts 11 and 11'. , FIGS. 10 to 12 show another embodiment in which the guide piece is supported by the support frame 7 so as to be movable back and forth. That is, as shown in FIG. 12, the guide pieces 17, 17' insert the shaft rods 12, 12' into the front edge of the plate piece 60, which has the downward abutment piece 15 and the upward shaft pin 16. A pair of upward folding pieces 61, 61'
and a downward folding piece 63 having a protrusion 62 on its lower edge that engages with the guide holes 26, 26' formed on the bottom plate 7c of the support frame 7, and a downward folding piece 63 formed on the bottom plate 7c of the support frame 7 on its rear edge. A protrusion 64 that engages with the guide grooves 24, 24'
The guide pieces 17, 17' configured in this way are each provided with a downwardly facing folded piece 65 having a lower edge.
are supported on the inner surface of the bottom plate 7c of the support frame 7 so as to be movable back and forth, as shown in FIG. As shown in Figure 11, 67
Reference numeral 7e indicates a guide slit for the storage section provided on the support frame upper plate 7d, and 7e indicates a buffer plate provided on the inner surface of the support frame rear plate 7b.

In addition, in FIGS. 10 to 12, 1 to 9
The same reference numerals as in the drawings indicate the same members, and their functions are the same as in the first embodiment.

Further, in the first 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, 3b are provided with a recessed portion 66 into which the shaft rod 2 can be inserted, and a hook portion 68 is provided on the upper end.
As shown in FIG. 3, with the shaft 2 interposed in the recess 66 of the support piece 3, the support frame upper plate 7d can be freely moved back and forth by engaging the hook 68 in a long hole (not shown). Of course, it may be supported by

Furthermore, in the above, the actuating plate is formed with an inclined edge that abuts each of the memory sections of the tuning pieces, and the actuating plate is laterally moved in a direction perpendicular to the operating axis by the abutting of the inclined edges and the memory sections. Of course, the variable tuning element may be configured to be variable. However, as described above, the configuration in which the actuating plate 48 is moved in the same direction as the operating shaft 1 has the following disadvantages.

That is, from the state in which one of the tuning shafts 11' is currently held in the forward movement state and the operating plate 48 is in abutment with the front edge of the storage section 18a', the other tuning shaft 11 is moved forward together with the operating shaft 1. When moving forward, the one tuning shaft 11' is restored by its restoring spring 23', and the operating plate 48 is also moved rearward by its elastic spring 52, so that the other tuning shaft 11', which is in the middle of forward movement, is restored by its restoring spring 23'. It collides with the memory portion 18a of the tuning shaft 11, producing a so-called hammer effect. This hammer action is strongest when one memory section 18a' is set at the forwardmost position on the tuning axis 11' and the other memory section 18a is set at the rearmost position on the tuning axis 11. arise. As a result, the mechanical vibration caused by the hammer action causes some rotational force to act on the threaded joint between the tuning shaft 11 and the tuning piece 18, causing tuning errors and mechanical damage at the matching position. There is a fear that this will occur.

Therefore, in this application, in order to improve such concerns, the tuning pieces on one tuning axis that are in a non-tuning state and the tuning pieces on the other tuning axis that are in a tuning state are It is required that an abutting portion abutting against the actuating plate be provided on the operating shaft so as to be located between the abutting surfaces of the channel selection pieces when in the uppermost rearmost position.

That is, in FIGS. 1, 3 and 9 to 11, reference numeral 70 indicates an abutment portion extending upwardly from the front piece 3a of the support piece 3, and FIG. 15 shows an abutment portion that satisfies the above requirements. Joint part 70 and one pair of left and right selection pieces 1
8 and 18', in which the abutting section 70 is brought as close as possible to the abutting surface a' of the memory section 18a' of one of the channel selection pieces 18' in the channel selection state. It shows.

Next, to explain the abutting action of the actuating plate 48 against the abutting portion 70 in FIG. 16, FIG. ' is at the forwardmost position on the channel selection shaft 11', the actuating plate 48 is in contact with the abutment surface a', and the storage section 18a of the other channel selection piece 18 in the non-selection state is in the forward position. This shows a state in which the operating shaft 1 is at the forwardmost position on the channel selection axis 11, and when the operation shaft 1 is moved forward from this state, in the forward movement process, the one channel selection axis 11 that is in the channel selection state is moved forward as described above. ' moves backward, and the actuating plate 4
8 collides with the abutting section 70 and is received before colliding with the abutting surface a of the other storage section 18a which is in the non-tuned state, as shown in FIG. Next, when the operating shaft 1 is further advanced, the actuating plate 48 is moved forward by the abutting part 70, and as shown in C in the figure, the actuating plate 48 is sufficiently pushed in by the abutting part 70, and then When the forward movement of the operating shaft 1 is released, the operating shaft 1 returns to its original position and the operating plate 48 also moves rearward to abut against the abutting portion a of the other storage section 18a, as shown in D in the figure. In this case, the other memory section 18a has moved forward sufficiently together with its tuning shaft 11, so the distance from when the actuating plate 48 leaves the abutment section 70 to when it comes into contact with the abutment surface a of the other memory section 18a is It becomes smaller and the hammer action is weakened.

That is, when the abutment part 70 is not provided, the distance that the actuating plate 48 moves back corresponds to approximately l, as shown in FIG. Then, the distance is reduced to l', and in addition, the elastic force of the spring 52 of the actuating plate 48 is first received by the abutting portion 70, and then softened by the pulling action of the finger pressing the push button 6, and the force is memorized. Part 1
Since it comes into contact with the abutment surface a of 8a, the hammer action is weakened, which has the advantage of eliminating channel selection errors and mechanical damage.

1 to 16 above, the pressing stroke of the operating shaft 1 is enlarged and the tuning shafts 11, 1
1', a horizontally rotatable interlocking piece 4 provided on a support 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 operates together with the operating shaft 1 in the front-rear direction and is freely rotatable in the rotational direction;
1' 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 16, 16'. 17 to 26 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 17 having racks 81, 81' that co-move with the tuning shafts 11, 11' in the front-rear direction, are free in the rotational direction, and mesh with the pinion 80;
17', and the same reference numerals as in FIGS. 1 to 16 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, the switching mechanism 34 causes one of the guide parts, for example, the guide part 17' located on the right side, to move to the switching mechanism 34. Since its forward movement is prevented by the rack 81', the pinion 80 is guided by the rack 81' and moves forward while rotating horizontally. The guide piece 17 located on the left side of the operating shaft 1 moves forward with a stroke that is twice the pressing stroke of the operating shaft 1, and the front piece 14a of this guide piece 17 moves forward.
The locking piece 19 is fixed by the restoring spring 23.
are in contact with each other, so the shaft rod 2 is also in contact with the guide piece 17.
The rest of the operation is exactly the same as in the embodiment shown in FIGS. 1 to 16.

Since the present application is configured as described above, when storing a large number of stations in the same band, there is no need to provide buttons for each of the large number of channel selection axes, and the buttons can be spaced widely, making it possible to It is possible to prevent other buttons from being pressed at the same time, and furthermore, for example, one pair of tuning axes in one set of tuning mechanisms can be used to receive stations in two different reception bands, and one set of tuning mechanisms can be used to receive stations in two different reception bands. The pair of tuning axes can further store stations in two different receiving bands, providing a versatile tuner from which stations in many receiving bands can be selected, and preset operations are possible. It can be done easily and minutely, the operation is reliable, there is no mechanical damage, and high channel selection accuracy can be obtained.
Since the tuning axis can be moved with a stroke twice as long as the movement stroke of the operation axis, if you want to make the movement stroke of the tuning axis the same as the conventional one, the distance from the rear surface of the support frame to the protruding end surface of the push button must be This invention has advantages such as being short and shortening the overall depth dimension, and is an extremely useful invention as a tuner.

[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. 6 is a perspective view of the guide piece, FIG. 7 is a perspective view of the switching mechanism, FIG. 8 is a partially omitted partial plan view of FIG. 1, and FIG. 9 is a plan view showing the state in the middle of operation. 10th, 11th, 1st
2 shows another embodiment, FIG. 10 is a partial plan view, FIG. 11 is a sectional view taken along the line D-D in FIG. 10,
FIG. 12 is a perspective view of the guide piece, FIG. 13 is a sectional view taken at the position of the operating shaft in another embodiment, FIG. 14 is a perspective view of the support piece in that embodiment, and 15th and 16th The figure is an explanatory diagram of the operation, and Figures 17 to 26 show other embodiments with different enlargement mechanisms.
9, FIG. 10, FIG. 11, FIG. 12, FIG. 13, and FIG. 14. In the figure, 1 is an operating shaft, 3 is a support piece, 4 is an interlocking piece, 5 is a driving gear, 6 is a push button, 7 is a support frame, 8 is a restriction part, 9, 10, 22, 22', 23, 23 ′、
30 and 52 are springs, 11 and 11' are tuning shafts,
13, 13' are threaded parts, 15, 15' are abutment pieces, 1
6, 16' are shaft pins, 17, 17' are guide pieces, 1
8, 18' are tuning pieces, 19, 19' are engaging parts, 2
0, 20' are driven gears, 27 is a lock plate, 33 is a cam piece, 34 is a switching mechanism, 36, 36' is a rising piece,
38 is a rocking plate, 39 and 39' are contact pieces, 41 is a rotating plate, 43 is a snap spring, 48 is an operating plate, 51 is a variable tuning element, 60 is a folding piece, 63, 6
5 is a downwardly bent piece, 62 and 64 are protrusions, 70 is an abutting portion, 80 is a pinion, and 81 and 81' are racks.

Claims (1)

[Scope of Claims] 1. A pair of operating shafts having a driving gear, a selection piece located on the left and right sides of the operating shaft, which is screwed into a screw portion and moves in the front and back direction, and a driven gear that meshes with the driving gear. A tuning shaft is mounted on a support frame so as to be rotatable, movable back and forth, and automatically returnable, and the pressing stroke of the operating shaft is expanded between the operating shaft and the pair of tuning shafts. An enlargement mechanism is provided which is transmitted to the channel selection shaft, and the support frame is further provided with a switch that switches forward and backward of the operating shaft to alternately allow forward movement of one channel selection shaft and prevent forward movement of the other. a mechanism, a lock mechanism that maintains the forward moving state of one of the tuning shafts that moves forward together with the operation shaft at a position where the main gear and the driven gear mesh, and releases the forward motion of the other tuning shaft; , and a variable tuning element that is variable by acting on a tuning piece of a tuning axis held in a forward moving state. 2. The enlarging mechanism is provided with a horizontally rotatable interlocking piece provided on a support piece that co-moves with the operating shaft in the front-rear direction, and a horizontally rotatable interlocking piece that co-moves with the tuning axis in the front-rear direction and engaging with an end of the interlocking piece. 2. A push-button tuner according to claim 1, wherein said push-button tuner is comprised of a guide piece that is coupled to each other. 3. The expansion mechanism includes a horizontally rotatable pinion provided on a support piece that co-moves with the operating shaft in the front-rear direction, and a guide piece that co-moves with the tuning shaft in the front-rear direction and has a rack that meshes with the pinion. A push-button tuner according to claim 1, comprising: 4. An operation shaft having a main drive gear, and a pair of channel selection shafts located on the left and right sides thereof and having a selection piece that is screwed into a threaded part and moves in the front and back direction, and a driven gear that meshes with the main drive gear. The support frame is equipped to be rotatable and movable back and forth, and to be able to automatically return, and is arranged between the operating shaft and the pair of tuning shafts to expand the pressing stroke of the operating shaft and transmit it to the tuning shaft. an enlargement mechanism, and further includes a switching mechanism on the support frame that switches forward and backward of the operating shaft to alternately allow forward movement of one channel selection axis and prevent forward movement of the other, and the operating axis; A lock mechanism that maintains the forward moving state of one of the tuning shafts, which moves forward together, at a position where the main gear and the driven gear mesh, and releases the forward motion holding state of the other tuning shaft, and holds the other tuning shaft in the forward moving state. The push-button tuning device is equipped with variable tuning elements that operate with the tuning pieces of the tuned tuning shaft to change the tuning, and further the diameter of the driven gear is made larger than the diameter of the main drive gear. vessel. 5. An operation shaft having a main drive gear so as to be free in the front and back direction and co-move in the rotational direction, and a tuning piece located on the left and right sides of the drive gear that is screwed into a threaded part and moves in the front and back direction, and meshes with the main drive gear. A support frame is equipped with a pair of tuning shafts having a driven gear to rotate and move back and forth, and to be able to automatically return. The supporting frame is provided with an enlargement mechanism that enlarges the pressing stroke of the operating shaft and transmits the same to the tuning shaft, and further includes a mechanism in the support frame that alternately allows forward movement of one of the tuning shafts by switching forward and backward of the operating shaft one step at a time. a switching mechanism that prevents forward movement of the
a lock mechanism that holds one channel selection shaft that moves forward together with the operation shaft in a forward motion state at a position where the main gear and the driven gear mesh, and releases the forward motion maintenance state of the other channel selection shaft; biasing means that acts with the tuning piece of the tuning shaft held in the state to permanently bias the variable tuning element and the driving gear rearward;
A push-button type tuning device characterized in that it is equipped with a regulating part that is pressed against the rear surface of the main drive gear and allows the main drive gear and the driven gear to mesh when the tuning shaft is held in a forward moving state. vessel. 6. An operating shaft having a main drive gear, and a pair of channel selection shafts located on the left and right sides thereof and having a selection piece that is screwed into a threaded part and moves in the front and back direction, and a driven gear that meshes with the main drive gear. The support frame is equipped to be rotatable and movable back and forth, and to be able to automatically return, and is arranged between the operating shaft and the pair of tuning shafts to expand the pressing stroke of the operating shaft and transmit it to the tuning shaft. an enlargement mechanism, and further includes a switching mechanism on the support frame that switches forward and backward of the operating shaft to alternately allow forward movement of one channel selection axis and prevent forward movement of the other, and the operating axis; A lock mechanism that maintains the forward moving state of one of the tuning shafts, which moves forward together, at a position where the main gear and the driven gear mesh, and releases the forward motion holding state of the other tuning shaft, and holds the other tuning shaft in the forward moving state. A variable tuning element is provided on the operating axis to interact with the tuning piece of the tuning axis that is in the non-tuning state, and a variable tuning element that changes the tuning piece of the tuning axis that is in the non-tuning state and the tuning element that is in the tuning state. When the tuning pieces of a certain tuning axis are both at the rearmost position on the tuning axis, an abutment that is located between the abutting surfaces of the tuning pieces and the actuation plate and abuts the actuation plate. A push-button tuner characterized by having a section.