JPS6141275Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crank device, and is capable of absorbing variations in the dimensional accuracy of parts and mounting positions with an extremely simple structure.

Conventionally used crank devices have a pin provided on the crank arm that is rotatably fitted into a through hole provided at one end of the lever, and a through hole provided at the other end of the lever is fitted with a pin provided on the moving body. The lever is rotatably fitted in the crank arm, and the lever is swung according to the movement of the crank arm, thereby moving the driven body by a predetermined amount. However, with this configuration, if the dimensional accuracy of each part such as the crank arm, lever, and driven body varies in the mounting position, the through holes at both ends of the lever will fit into the pins of the crank arm and driven body. The problem is that it cannot be done. There is also the problem that if the fitting is forced, smooth operation cannot be performed.

The present invention provides a crank device that has a simple structure and can solve the problems of the prior art.

An embodiment in which the present invention is applied to an audio amplifier will be described below with reference to the drawings.

In the figure, 1 is a cabinet constituting the main body of the device, 2 is a front panel thereof, 3 is a display provided on the front panel 2, and 4 is an operation knob also provided on the front panel 2.

5 is a unit storage window provided in the front panel 2, 6 is an operating unit that is housed in the unit storage window 5 so as to be freely accessible, and 6a is formed from approximately the center of both sides of the operating unit 6 toward the rear end. A guide groove 6b is a front end surface of the operating unit 6, 6c is a protrusion provided at the center of the upper surface of the operating unit 6, and 7 is a guide groove installed on the upper surface of the operating unit 6, and is used to guide a volume or a switch provided in the operating unit 6. etc. (not shown).

Reference numeral 8 denotes a U-shaped metal guide rail mounted on the chassis 9 behind the unit storage window 5, and 8a, 8a are formed on both sides of the guide rail in a direction opposite to the guide groove 6a of the operating unit 6. 8b is a long hole formed in the bottom of each guide groove 8a, and 8c is formed between the bottom and both side surfaces of the guide rail 8 in order to provide sufficient springiness to both sides. It is a through hole. Both side surfaces of the guide rail 8 are formed so as to be slightly inclined inward in a natural state, and as shown in FIG.
When it is stored, it is pushed outward slightly so that the distance between both sides is S.

The guide groove 6a of the operating unit 6 and the guide groove 8a of the guide rail 8 are both trapezoidal grooves having vertically tapered surfaces, and as shown in FIG. In both cases, the width of the bottom surface is W ₁ .

10 is a bearing plate made of resin, 10a is a locking pawl integrally formed at both ends, 10b is a bearing hole formed in two places in the center, and 11 is a shaft 11a.
This is a guide roller composed of a roller 11b and rollers 11b at both ends thereof. Note that the rollers 11b, 1
The outside of 1b is formed into a conical shape. The guide roller 11 is rotatably attached to the bearing plate 10 by fitting its shaft 11a into the bearing hole 10b of the bearing plate 10.
0, the claws 10a, 10a at both ends are connected to the guide rail 8.
By engaging with the elongated holes 8b, 8b, the claw 10
a is attached to the guide rail 8 so as to be movable within a sliding range in the longitudinal direction of the elongated hole 8b.
As shown in FIG. 6, the width _W2 at both ends of the rollers 11b and 11b of the guide roller 11 is slightly smaller than the width _W1 of the bottom surface of the guide grooves 6a and 8a of the aforementioned operating unit 6 and guide rail 8. It is set to be large.

12 is a motor for automatically retracting and protruding the operating unit 6; 13 is a vibration isolating rubber for preventing noise from the motor 12; 14 is a motor holding fitting; 15 is a vibration isolating rubber 13 and a motor holding fitting 14.
These are screws for attaching the motor 12 to the motor 12, and these constitute a motor block 16. This motor block 16 is attached to the chassis 9 with screws (not shown).

17 is an original shaft pulley attached to the shaft of the motor 12, 18 is a worm shaft rotatably attached to a part of the guide rail 8, 19 is a drive pulley attached to one end of the worm shaft 18, and 20 is an original shaft. A belt for power transmission is suspended between the pulley 17 and the drive pulley 19, 21 is a shaft attached to the guide rail 8, 22 is rotatably attached to the shaft 21, and a gear provided on the outer periphery is connected to the worm shaft 18. 22a is an arm integrally formed on a part of the upper surface of the worm wheel 22, 22b is an arm 22
This is a pin provided at the tip of a. Although not shown, grooves for fixing E-rings are formed on the outer peripheries of the tips of the shaft 21 and the pin 22b, respectively, and by fixing the E-rings to these grooves, the worm wheel 22 and levers 24 and 25, which will be described later, are respectively connected to the shaft 2.
1 and pin 22b so that they do not come out in the axial direction. Furthermore, recesses 22c for detecting the rotation angle of the worm wheel 22 are provided on the lower surface of the gears of the worm wheel 22 at positions facing each other at an angle of 180 degrees, and the recesses 22c are provided on the upper surface of the guide rail 8. A limit switch 23 is installed which is operated by.

Reference numerals 24 and 25 indicate levers that constitute a crank mechanism 26 together with the arm 22a of the worm wheel 22. As shown in FIG. 8, one end of the lever 24 is formed with a hole (not shown) into which the above-mentioned pin 22b is loosely fitted, and the other end is provided with a locking piece 24a for locking one end of the spring 27. A projection 24b is formed at both ends for guiding one end of the lever 25.
is formed. On the other hand, the lever 25 has an elongated hole 25a into which the pin 22b is loosely fitted, an elongated hole 25b into which the locking piece 24b of the lever 24 is loosely fitted, and a spring 27.
A locking piece 25c for locking the other end and an engagement hole 25d to be engaged with the projection 6c of the operating unit 6 described above are formed. The levers 24 and 25 are always urged to attract each other by a spring 27 suspended between the two locking pieces 24a and 25c.
The worm wheel 22 and the operating unit 6 are connected by loosely fitting into the pin 22b of the lever 2a and fitting the engagement hole 25d of the lever 25 into the protrusion 6c of the operating unit 6.

Note that 28 is a motor start button provided on the front panel 2, and when this button 28 is pressed once, a starting current flows through the motor 12 for a certain period of time determined by a motor start circuit (not shown). .

In the above configuration, when the operating unit 6 is stored, the operating unit 6 is stored as shown in FIGS.
is pushed in to a position where its front end surface 6b is flush with the front panel 2. At this time, the worm wheel 22 is attached to the arm 22a as shown in FIG.
is rotated to the most rearward position, and one recess 22 provided on the lower surface of the worm wheel 22
Since point c releases the pressure on the operating piece of the limit switch 23, the power to the motor 12 is cut off.

If you press the motor starting pump 28 from this state,
Current is supplied to the motor 12 for a certain period of time, and the motor 1
2 starts. The rotation of this motor 12 is caused by the belt 2
0 to the worm shaft 18, and the worm wheel 22 rotates in the direction of arrow A in FIG. 3 in accordance with the rotation of the worm shaft 18. As a result, the operating portion (not shown) of the limit switch 23 comes out of the recess 22c of the worm wheel 22 and comes into pressure contact with the outer periphery of the worm wheel 22, turning on the limit switch 23. Therefore, after that, motor 1
Even if the starting current to motor 2 is cut off, current continues to be supplied to motor 12 via limit switch 23, and worm wheel 22 continues to rotate. The rotation of this worm wheel 22 is caused by the arm 22a and the lever 2.
4, 25, etc. to the operating unit 6, the operating unit 6 is pushed forward, and the front panel 2 is pushed forward as shown in FIG.
projected from. and worm wheel 22
However, when the arm 22a rotates until it is at the most forward position as shown in FIG. 4, the worm wheel 2
Another recess 22c provided on the lower surface of the limit switch 22 comes to face the operating section of the limit switch 23, and the limit switch 23, which had been in the on state, is switched to the off state. Therefore, the rotation of the motor 12 is stopped at the position where the operating unit 6 is most protruded, resulting in the operating state shown in FIGS. 2 and 4. In this state, all the operating knobs 7 provided on the operating unit 6 are exposed on the outside of the cabinet 1, so that desired operations can be performed by operating them.

Incidentally, the guide groove 6a of the operating unit 6 and the guide groove 8a of the guide rail 8 each have a tapered surface on the top and bottom, and the rollers 11b and 11b of the guide roller 11 housed between them also have a tapered surface. is configured. And each guide groove 6
Compared to the bottom width W ₁ of rollers 11b and 8a,
The width W ₂ between the guide rails 11b is configured to be slightly longer, and since both sides of the guide rail 8 are biased so as to be inclined inwardly, the guide rail 8 is configured to be slightly longer than the width W 2 between the guide rails 11b and When the guide roller 11 is housed between the grooves 6a and 8a, the tapered surfaces of the guide grooves 6a and 8a can be reliably pressed against the tapered surfaces of the rollers 11b and 11b. Therefore, by vertically sliding these tapered surfaces against each other, the vertical center of the operating unit 6 and the vertical center of the guide rail 8 (particularly its guide groove 8a) can be automatically aligned. can. Therefore, it is possible to reliably prevent the guide rail 8 and the operating unit 6 from being out of center and being unable to be accommodated, or from shaking during operation.

Further, since the bearing plate 10 to which the guide roller 11 is attached has its pawl 10a movably engaged with the elongated hole 8b of the guide rail 8, it slides with respect to the guide rail 8 within the range of the elongated hole 8b. On the other hand, the operating unit 6 slides with respect to the guide roller 11 within the range of the guide groove 6a. Figures 7a to 7d schematically show this situation, and Figures 7a, 7d,
When the operating unit 6 is pushed out in the direction of arrow c while rotating the guide roller 11 in the direction of arrow B from the stored state of the operating unit 6 shown in c, the guide roller 11 itself moves forward within the range of the guide groove 8a of the guide rail 8. The operating unit 6 further moves forward within the range of its guide groove 6a.
Therefore, if both of the above-mentioned moving amounts are respectively l, when the operating unit 6 is completely projected as shown in FIGS. 7b and 7d, the front end surface 6b of the operating unit 6 will protrude from the front panel 2 by 2. become. Conversely, in order to make the operating unit 6 protrude by 2 minutes, it is sufficient to use a guide groove 6a with a length of 1, and the length of the guide groove 6a can be shortened to 1/2 of the total protrusion amount. I'm struggling. Therefore, the guide groove 6a only needs to be provided at the rear of the side surface of the operating unit 6, and the inconvenience that the guide groove 6a is exposed to the outside of the cabinet 1 and spoils its appearance when the operating unit 6 is fully protruded can be avoided. can be resolved.

Furthermore, if the crank mechanism 26 is constructed of two levers 24 and 25 that are arranged so as to be slidable in the longitudinal direction, and a spring 27 that biases them in the direction of pulling them together, as in the above embodiment, each Dimensional errors in parts can be easily absorbed to ensure stable operation.

That is, as shown in FIG. 8, when the arm 22a provided on the worm wheel 22 rotates, the effective diameter φ
D is the slide stroke st1 of the operating unit 6
(In other words, the distance from the state where it is regulated by the stopper 29 inside the cabinet to when it fully protrudes),
A dimension that is the sum of the relative slide stroke st2 of the two levers 24 and 25 (that is, the distance that the pin 22b and the locking piece 25c can move in the long holes 25a and 25b against the biasing force of the spring 27) become. Therefore, while the pin 22b moves within the elongated hole 25a,
In other words, during the slide stroke st2, the rotational force of the worm wheel 22 is not transmitted to the operating unit 6, but in other rotation ranges, the pin 22b presses one end of the elongated hole 25a, so the two levers 24, 25 acts essentially as an integrated lever and operates like a conventional crank to push the operating unit 6 forward. Therefore, the dimensional errors and installation errors of each component can be absorbed in the slide stroke st2, and extremely stable operation can be performed.

In the above embodiment, the operating unit 6 is used as the driven object, but it goes without saying that other objects may also be used.

As described above, the present invention consists of two levers that are stacked so that they can slide freely in the longitudinal direction, and a spring that biases the levers toward each other is suspended between the two levers. The through hole provided in the lever is rotatably fitted into the pin of the crank arm, the elongated hole provided in the other lever is loosely fitted into the pin of the crank arm, and the through hole provided in the other lever is fitted loosely into the pin of the crank arm. It is rotatably fitted onto a pin of a driven body, and the movement of the crank arm is transmitted to the driven body via the two levers. In this way, variations in the dimensional accuracy of the parts and their mounting positions can be absorbed by the expansion and contraction of the two levers, and extremely stable operation can be achieved. Moreover, after the pin of the crank arm contacts one end of the elongated hole of the other lever, the two levers are pushed by the pin of the crank arm and move as one, so the conventional single lever was used. It is possible to perform substantially the same operation.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing an embodiment of the present invention in a stored state and a used state, FIGS. 3 and 4 are perspective views showing the main parts of the same in a stored state and a used state, and FIG. 5 6 is an exploded perspective view of the main parts of the same embodiment, FIG. 6 is a sectional view of the main parts of the same embodiment, and FIGS. 7 a, b, c, and d schematically show how the operating unit of the same embodiment moves. 8a, b, and c are plan views for explaining the operation of the crank mechanism of the same embodiment. 1... Cabinet, 2... Front panel, 3...
...Display, 4...Operation knob, 5...Storage window, 6
...Operation unit, 6a...Guide groove, 7...Operation knob, 8...Guide rail, 8a...Guide groove,
9... Chassis, 10... Bearing plate, 11... Guide roller, 11b... Roller, 12... Motor,
16...Motor block, 17...Original shaft pulley,
18... Worm shaft, 19... Drive pulley, 20
... Belt, 22 ... Worm wheel, 22a
... Arm, 22c ... Recess, 23 ... Limit switch, 24, 25 ... Lever, 26 ... Crank mechanism, 27 ... Spring, 28 ... Motor start button.

Claims (1)

[Scope of utility model registration request] Two levers are stacked so that they can slide in the longitudinal direction, a spring is suspended between the two levers to bias the levers in a direction that pulls them together, and a through hole is provided in one of the levers. is rotatably fitted to the pin of the crank arm, and the long hole provided in the other lever is loosely fitted to the pin of the crank arm,
Further, in the crank device, a through hole provided in the other lever is rotatably fitted into a pin of a driven body, so that movement of the crank arm is transmitted to the driven body via the two levers.