JPH036954Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a music box switching mechanism.

[Prior Art] Relatively high-grade music boxes have pin groups for multiple songs formed on the drum, and the pin group corresponding to one song sequentially hits a vibrating valve, so that when the performance of one song is finished, There is a system in which the drum is moved in its axial direction, and then a group of pins in charge of other songs are used to sequentially strike vibration valves to play other songs.

As a music program switching mechanism for such a music box, the one described in Swiss Patent No. 582934 is known. In the device described in the above Swiss patent specification, a drum having two groups of pins adjacent to each other for repelling vibration valves is movable in the axial direction and supported on a central shaft, and a driving gear is mounted on this central shaft in line with the drum. A cam is supported immovably in the axial direction, a cam is rotatably supported on one of the opposing parts of the drum and the driving gear, and the drum is pressed against the cam by the elasticity of a spring, and the engagement part of the drum is fixed to the frame. A switching member extended into the range of movement of the cam turns the cam by a certain angle for each rotation of the drum, thereby moving the drum in the axial direction and switching the music to be played. The program switching member is manufactured independently from other members, and is assembled while adjusting the position with the other members when assembling the music box.

Furthermore, it has been proposed that the program switching member is formed integrally with a support member of a speed regulating gear.
(Jitsugan No. 58-155733).

In any of the above conventional examples, the cam is supported by a drum or a drive gear and revolves, and is rotated when it engages with the program switching member.

[Problems to be solved by the invention] The cam is elastically held between the drum and the drive gear. However, due to shocks and vibrations,
When the drum slides in the direction of its central axis, the pressing force on the cam disappears, causing a phenomenon in which the position of the cam in the direction of rotation is displaced. Depending on the stop position of the cam, when the cam engages with the program switching member,
A fatal problem arises for music boxes: the cam becomes unable to rotate.

[Means for Solving the Problems] The present invention forms a plurality of protrusions that engage with the switching member at equal intervals on the circumferential surface of a cam that engages with the program switching member, and the tip of the protrusion The music box has a song switching mechanism in which the edge is tilted forward and downward toward the lag side in the rotational direction of the cam.

[Operation] When the drum rotates once, the cam is rotated by a certain angle by engaging one of the protrusions formed on the circumferential surface of the cam with the program switching member. When the drum is moved in the axial direction due to an impact or the like and the pressing force between the drum and the cam is removed, the cam rotates relatively freely, but in this case as well, the cam does not engage with the program switching member. The cam can be rotated reliably.

[Example] Hereinafter, the present invention will be described in detail based on the illustrated example.

In FIG. 3, a barrel 2 is fixed to one corner of a rectangular frame 1. The barrel 2 houses a full body as a driving source for the music box and a gear rotated by the full body. A drum 3 that is rotatably driven by the stored force of a barrel 2 is pivotally supported on the frame 1, and the base of a diaphragm 4 having a large number of vibration valves is fixed thereto. The diaphragm 4 has the tip of each vibrating valve facing and close to the outer peripheral surface of the drum 3, and when the drum 3 is driven to rotate, vibration valves are formed on the peripheral surface of the drum 3 in accordance with a predetermined performance program. Its tip is flicked by a group of pins to play a predetermined piece of music. The frame 1 includes a speed regulating mechanism 5.
is provided, and by keeping the rotational speed of the drum 3 constant, the playing speed is kept substantially constant.

Next, the detailed configuration of each part will be explained.

In FIG. 4, the drum 3 is a plate-shaped drum body with a large number of pins 6 formed according to a predetermined track, bent into a cylindrical shape, and end plates 7 and 8 are provided at both ends of the drum body, respectively. Fitted and fixed. A large number of pins 6, 6, . Moreover, the pitch of the pins 6, 6, . . Both end plates 7, 8
A central shaft 9 is inserted through the drum 3 to support the drum 3. The central shaft 9 is rotatably supported at one end by a side wall of the barrel barrel 2 and at the other end by a bearing portion 10 of the frame 1.

A small diameter gear 1 as a drum drive gear is mounted on the central shaft 9 between the end plate 7 of the drum 3 and the barrel 2.
1 and a large-diameter gear 12 integrated therewith are fitted and fixed. The small diameter gear 11 meshes with a gear (not shown) that partially protrudes from the barrel 2,
It is rotationally driven by the barrel together with the large diameter gear 12.
The drum 3 is supported so as to be movable in the axial direction with respect to the central shaft 9, and is moved toward the large diameter gear 12 by a spring 13 interposed between the end plate 8 and the bearing part 10. energized. The end plate 7 of the drum 3 has, as shown in FIG. 6, near its periphery.
The short shaft 14 is fixedly planted. The tip of the short shaft 14 is fitted into a radially extending elongated hole 15 (see FIG. 5) formed in the large-diameter gear 12 so as to be movable in the axial direction. That is, the rotational force of the large-diameter gear 12 is transmitted to the drum 3 via the short shaft 14 to rotate the drum, but the drum 3 is axially rotated with respect to the large-diameter gear 12. It is relatively movable.

The short shaft 14 has a cam 16 as shown in FIG.
is rotatably supported. In the illustrated example, the cam 16 has protrusions 17 formed on its circumferential surface at 90 degree intervals in the radial direction. The cam 16 is an end-face cam, and high-lift parts 18 and low-lift parts 19 are alternately formed on one end face in a part proximal to the protrusion 17 with a phase difference of 90 degrees. High head section 18
and the low lift portion 19 are connected to each other via the slope portion. As will be described later, the cam 16 revolves as the drum 3 rotates, and when engaged with the program switching member, is rotated about the short shaft 14 in the direction of arrow a. The leading edge 17a is formed so as to be inclined forward and downward toward the lag side in the rotational direction a of the cam.

A pair of projections 20 as cam followers are provided on the end plate 7 at symmetrical positions with respect to the short axis 14 and are formed by being punched outward. These protrusions 20 are caused by the elastic force of the spring 13 on the drum 3.
is brought into pressure contact with the cam surface of the cam 16 due to its movement behavior. The other surface of the cam 16 is a large diameter gear 12
It is pressed against the surface of the Therefore, the cam 16
Each time the drum 3 is rotated by 90 degrees, the cam surface that the protrusion 20 comes into pressure contact with is alternately switched to a high lift portion 18 and a low lift portion 19, and the drum 3 is moved in the axial direction. The distance traveled by the drum 3 by switching the cam surface is set to correspond to one half of the pitch of the vibration valve on the diaphragm 4, and the group of pins on the drum 3 that play the vibration valve are in charge of one song. The pin group is switched to the pin group that handles other songs,
It is now possible to switch the songs being played.

As a means for biasing the drum 3, instead of the coil spring 13, another type of elastic member may be used.

The large diameter gear 12 is connected to the speed regulating mechanism 5.
In FIGS. 8 and 9, the speed regulating mechanism 5 is supported on a base plate 22 fixed to the frame 1. As shown in FIGS. The main plate 22 rotatably supports a small-diameter gear 25 and a large-diameter gear 26 integral with the small-diameter gear 25 between bent portions 23 and 24 raised parallel to each other. The small diameter gear 25 meshes with the large diameter gear 12 that rotates the drum 3. Main plate 22
A bent portion 27 is also formed parallel to the bent portion 23, and a shaft 28 is rotatably supported between both bent portions. A small gear 29 with which the large diameter gear 26 meshes is formed on the shaft 28, and a worm gear 30 having a larger diameter than the gear 29 is fitted and fixed thereto. The worm gear 30 meshes with a worm (not shown) of a worm shaft 32 rotatably supported between the base of the base plate 22 and a horizontal bent portion 31 facing the base. That is, gears 12, 2
A gear train consisting of the wheels 5, 26, 29, 30 and the worm shaft 32 constitutes a speed-increasing wheel train, and the worm shaft 32 is driven to rotate at high speed as the drum 3 is driven to rotate. The worm shaft 32 includes
A wind blade 33 as a regulating rotor is fixed, and when the worm shaft 32 and the wind blade 33 rotate at high speed, the rotational speed of the worm shaft 32 is maintained substantially constant due to the wind cutting action of the blade 33. Therefore, since the rotational speed of the gear train connected to the worm shaft 32 is maintained substantially constant, the rotational speed of the drum 3 is maintained substantially constant, and the performance speed is maintained substantially constant.

The main plate 22 that supports the speed regulating mechanism 5 has an engaging portion 35 as a program switching member formed at the tip of the bent portion. This engaging portion 35 is advanced onto the locus of movement of the protrusion 17 of the revolving cam 16. As the drum 3 rotates, the cam 16 engages the engaging portion 35.
When the cam 16 has moved to the position , the protrusion 17 engages with the engaging portion 35 and the cam 16 is rotated 90 degrees around the short axis 14, and the drum 3 is aligned with the central axis 9 as described above. The group of pins 6 relative to the diaphragm 4 is switched by moving the diaphragm 4 in the direction of the diaphragm 4, thereby switching the number of pieces of music to be played. That is, although the illustrated program switching member consists of the engaging portion 35 formed integrally with the main plate 22, the program switching member of the present invention may be formed separately from the main plate 22. good.

Instead of the end plate 7 of the drum shown in FIG.
An end plate 37 as shown in the figure may also be used. In FIG. 7, a short shaft 38 that rotatably supports the cam 16 is fixed to the end plate 37, and a pin 39 as a cam follower that comes into contact with the cam surface of the cam 16 is fixed to the side thereof. ing.

In FIG. 3, the operating end of the operating lever 41 protrudes from the frame 1. As shown in FIG. This lever 4
1 is pressed against the end face of the large-diameter gear 12, and the drum 3 and the large-diameter gear 12
Each time the drum rotates, it falls into a hole 40 (see FIG. 5) formed near the periphery of the gear 12 to prevent rotation of the drum. A stopper 42 is integrally formed on the operation lever 41, and when the lever 41 is depressed into the hole 40 of the large-diameter gear 12, the stopper 42 is connected to the wind blade 3.
The blade enters the rotation range of No. 3 and prevents rotation of the blade. When the operating lever 41 has come out of the hole 40 and the drum 3 is rotating, the stopper 42 is retracted out of the rotation range of the wind blade 33 and allows the speed regulating mechanism 5 to operate. .

Now, when the operating lever 41 is operated to cause its tip to come out of the hole 40 of the large-diameter gear 12 and the stopper 42 is retracted out of the rotation range of the wind blade 33, the large-diameter gear 12 is moved using the barrel 2 as a drive source. The drums 3 and 3 are integrally rotated through the short shaft 14 to play a predetermined song. The tip of the operating lever 41 that has come out of the hole 40 is connected to the large diameter gear 12.
contact the end face of and rub it. When the drum 3 rotates once and the performance of each song is completed, the tip of the operating lever 41 fits into the hole 40 of the large diameter gear 12, stopping the drum 3 at a predetermined position, and the stopper 42 closes the wind blade. 33 and stops its rotation, stopping all operations of the music box.

At this time, the cam 16, as shown in FIG.
One of the protrusions 17 is connected to the engaging portion 3 of the program switching member.
5 and placed in a slightly rotated position. Then, when the operating lever 41 is operated to resume the rotation of the drum 3 in order to play the drum 3 again, the cam 16 moves to the one protrusion 17.
is engaged with the engaging portion 35, so that the short shaft 1
4 and rotated approximately 90 degrees in the direction of arrow a. When the cam 16 rotates, the cam lift section 18,1
The contact position of the protrusion 20 with respect to the drum 9 changes, and the drum 3 is accordingly moved in the direction of the central axis 9.
As the drum 3 moves, the pin group corresponding to the vibration valve of the diaphragm is switched to a pin group in charge of another song, and another song is played. The contact depth between the cam 16 and the engaging portion 35 is set so that the rotation angle of the cam 16 by one contact between the two is 90 degrees, and one rotation of the drum 3 results in one performance. The cam 16 is activated between the end of the performance and the start of the next performance.
The two songs will be played alternately, rotating 90 degrees at a time. In the above description, the two songs may be different songs, or may be one relatively long song divided into a first half and a second half.

When the drum 3 is rotated once and stopped, the cam 16 does not necessarily need to be engaged with the engaging portion 35 of the program switching member, but may be placed at a position immediately before engaging the engaging portion 35. Good too. Also in this case, the cam 16 is rotated 90 degrees by one engagement with the engaging portion 35.

Here, the mode of relative engagement between the protrusion 17 of the cam 16 and the engaging portion 35 will be explained with reference to FIG. 10.
The cam 16 has a short shaft 1 fixed to the end plate 7 of the drum.
It revolves on the rotation trajectory O of 4. When no impact is applied to the music box, the cam 16
Since the large-diameter gear 12 and the protrusion 20 of the end plate 7 are pressed together by the elasticity of the spring 13 (see Fig. 3), it does not rotate unexpectedly, and the protrusion occurs in the manner shown in Fig. 1. 35. When an impact is applied to the music box and the drum 3 moves in the axial direction, the pressing force against the cam 16 is lost, albeit momentarily.
At this time, if the cam 16 rotates about the short shaft 14, the cam is held in its rotational position by the pressing force of the spring 13. Therefore, cam 16
connects the protrusion 17 to the engaging portion 3 in various postures.
5 and engage with each other. 10th
Figure (a) shows a state in which the tip edge 17a of the protrusion 17 is engaged with the engaging portion 35. In this case, the engaging part 3
The force by which the ridgeline 35a of the cam 16 relatively pushes the tip edge 17a is directed toward the outside of the short axis 14, which is the center of rotation of the cam 16, so the revolving cam 16 can be easily rotated in the direction of the arrow a. In the same figure (b), the protrusion 17
, the obtuse ridgeline formed by the tip edge 17a and one side thereof is engaged with the engagement portion 35. In such an engaged state, the cam 16 can be rotated without any problem. In the same figure (c), the protrusion 17
This shows a state in which the acute ridgeline formed by the tip edge 17a and the other side is engaged with the ridgeline of the engaging portion 35. Even in such a case, the force by which the ridgeline 35a pushes the tip edge 17a relatively is directed toward the outside of the short axis 14, which is the center of rotation of the cam 16, so the revolving cam 16 easily rotates in the direction of the arrow a. I am made to do so.

The reason why the cam 16 is rotated by the engaging portion 35 no matter what attitude it takes is because the tip edge 17a of the protrusion 17 is inclined in the direction described above. If the tip edge 1 of the protrusion 17
The phenomenon that occurs when 7a is not tilted as in the present invention will be explained with reference to FIG. The non-slanted tip edge 17Aa is the engaging portion 3
5, the engaging portion 35 engages with the tip edge 17Aa.
The direction of the force that pushes the cam relative to the center axis of rotation 14
Since the cam 16A faces inward, depending on the attitude of the cam 16A, the cam cannot rotate and the music box stops playing. In addition, in FIG. 11, the protrusion 17
The broken line A indicates the slope of the leading edge in the present invention.

In the embodiment described above, the cam surface of the cam 16 for switching songs is formed on the drum 3 side.
The cam surface may be provided on the large-diameter gear 12 side, and the cam follower provided on the gear 12 may be brought into pressure contact with the cam surface. In addition, in the illustrated embodiment,
The drums were stopped every time a song ended, but
It is optional whether or not to provide a mechanism that stops the operation every time a song is played. Further, in the illustrated embodiment, four protrusions are formed on the circumferential surface of the cam with a phase difference of 90 degrees, but the number of protrusions may be three or six if they are equally spaced. Good too.

[Effect of the invention] As described above, according to the invention, since the tip edge of the protrusion formed on the cam is tilted forward and downward toward the lag side in the rotational direction of the cam, the engagement portion of the program switching member is When the cam is engaged with the cam, the rotation of the cam is not blocked, and a highly reliable program switching mechanism that does not stop the music box from being played can be provided.

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention;
The figure shows an example of a cam, where (a) is a plan view;
FIG. 3 is a plan view showing an example of a music box to which the present invention is applied, FIG. A side view showing an example of a large-diameter gear used in the example, FIG. 6 is a side view showing one end plate of the drum,
FIG. 7 is a side view showing another example of the end plate, FIG. 8 is a plan view showing an example of the speed regulating mechanism, FIG. 9 is a side view of the same, and FIG. 10 is an engaging portion of the program switching member. FIG. 11 is a side view showing different engagement modes between the front edge of the protrusion of the cam and the tip edge of the protrusion of the cam, and FIG. FIG. 1...Frame, 3...Drum, 4...Diaphragm, 7...
End plate, 9... Central shaft, 12... Large diameter gear, 13... Pressing means, 16... Cam, 17... Projection, 17a... Tip edge, 35... Track switching member.

Claims (1)

[Scope of utility model registration request] A drum having a pin for repelling the vibrating valve is axially movable and supported on a central shaft, a driving gear is supported axially immovably in line with the drum on the central shaft, and one of the opposing parts of the drum and the driving gear. The cam is rotatably supported, the drum is pressed against the cam by a pressing means such as a spring, and the switching member is fixed to the frame and extends the engaging portion into the movement range of the cam. In the music box music box music box switching mechanism, which switches a music box by rotating a cam and moving a drum in the axial direction, a plurality of protrusions that engage with the switching member are formed at equal intervals on the circumferential surface of the cam. A music box music box switching mechanism characterized in that a tip end edge of the protrusion is inclined forward and downward toward the lag side in the rotational direction of the cam.