JP4761677B2 - metronome - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the pendulum is vibrated at a predetermined frequency by the driving force from the driving source, and a rhythm forming surface is provided on the gear in the transmission wheel train from the driving source. It relates to a metronome that forms a desired rhythm by hitting the bell.
[0002]
[Prior art]
In such a metronome configuration, a pendulum is provided so that the pendulum can be moved, the pendulum is moved to select the frequency, and the pendulum vibration is controlled by a relief plate provided on a wheel in the transmission train wheel. Support the switching plate so that it can swing, attach a hammer to the meter switching plate, abut the tip of the hammer on the rhythm formation surface, and switch the contact position of the hammer on the rhythm formation surface by swinging the meter switching plate The rhythm is selected.
[0003]
[Problems to be solved by the invention]
In such a configuration, in order to strike a correct rhythm corresponding to the frequency, the initial position of the wheel and the initial position of the gear provided with the rhythm forming surface are relatively aligned. It is necessary to be. In the conventional configuration, assembling and disassembling are repeated many times during assembly, and finally the correct relative positional relationship is adjusted, and there is a problem that it takes time and labor to assemble and is complicated.
[0004]
Therefore, in the present invention, the relative positional relationship between the initial position of the wheel and the initial position of the gear can be set correctly through the frame at the time of assembly, and it can be easily assembled without having to be re-arranged. Like that.
[0005]
[Means for Solving the Problems]
Therefore, the metronome according to the present invention includes a drive source, a transmission wheel train that transmits the driving force from the drive source, a frame that supports the transmission wheel train, and a wheel provided in the transmission wheel train. A pendulum that vibrates at a desired frequency, a rhythm forming surface formed on one gear in the transmission wheel train, and a phosphorus that is controlled by the rhythm forming surface and beats at a desired rhythm. ing. The wheel is formed with a through hole, the frame is formed with a first positioning through hole facing the wheel through hole at an initial position of the wheel, and the gear has a through hole. And a second positioning through-hole facing the through-hole of the gear at the initial position of the gear is formed in the frame, and the through-hole of the wheel and the first positioning through-hole are formed. The transmission wheel train is assembled to the frame at a position where the through hole of the gear and the second positioning through hole face each other. With this configuration, it is possible to correctly set the relative positional relationship between the initial position of the wheel and the initial position of the gear via the frame during assembly.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
[0007]
1 to 4 show the overall configuration. The frame 1 is bent at a right angle, and includes a horizontal portion 1A and a vertical portion 1B, and a pendulum attachment portion 1C formed by bending a hole at the front end of the horizontal portion 1A. A second frame 2 that faces the horizontal portion 1A in parallel with the vertical portion 1B at a predetermined interval is fixed by screws 2a and 2b.
[0008]
The transmission wheel train for driving the pendulum is pivotally supported by the vertical portion 1B and the second frame 2. That is, the mainspring 3 is used as a drive source, the winding shaft of the mainspring 3 is the first shaft 4, and both ends of the mainspring 3 are rotatably supported by the vertical portion 1B and the second frame 2 that face each other in parallel. A first gear 5 is pivotally supported on the first shaft 4. The second shaft 6 is rotatably supported by the vertical portion 1B and the second frame 2, and the second shaft 6 is provided with a second pinion 7 so as to be able to mesh with the first gear 5 and the second gear 8 is pivoted. I support. The third shaft 9 is rotatably supported by the vertical portion 1B and the second frame 2 and a third pinion 10 is provided on the third shaft 9 so as to be able to mesh with the second gear 8. A wheel 11 is provided on the third shaft 9 so as not to rotate and to be movable in the axial direction. The wheel 11 has a cylindrical shape sandwiched between the flange portions 11a and 11b. The cylindrical portion protrudes outwardly at a central angle of 180 degrees on both sides divided in the axial direction. A relief plate 11c on the collar part 11a side and a relief plate 11d on the collar part 11b side are provided. In order to position the wheel 11 in the axial direction, a pair of positioning plates 12a and 12b are suspended from the horizontal portion 1A, and the collar portions 11a and 11b are sandwiched from the outside.
[0009]
The pendulum shaft 13 is pivotally supported in a horizontal state and rotatable in the front-rear direction by a bearing 13b provided in the mounting portion 1C and a bearing (not shown) fixed to the horizontal portion 1A. A pendulum receiver 14 is fixed near the front end of the pendulum shaft 13, and a pendulum 15 is fixed to the pendulum receiver 14. Further, the pendulum shaft 13 is provided with a pendulum pin (not shown) that protrudes in the radial direction toward the middle between both escape plates 11 c and 11 d of the wheel 11. By alternately engaging, the pendulum 15 is driven to swing. The pendulum 15 is provided with a free weight 16 at a position above the pendulum receiver 14 so as to be movable up and down. A fixed weight 17 is provided by a pin 18 at the lower end of the pendulum 15. The pendulum 15 can be vibrated at a desired frequency by moving the free weight 16 up and down to a desired position. As shown in FIG. 3, a winding wedge 19 and a winding gear 20 are provided in the vicinity of the protruding portion of the first shaft 4 from the second frame 2.
[0010]
As shown in FIG. 2, a time changeover plate 21 is pivotally supported on the vertical portion 1B so as to be swingable. In other words, a screw (not shown) is connected to the vertical portion 1B at an upper position of the time signature switching plate 21, and the time signature switching plate 21 is swingable with this screw as a swing center. The edge 1d at the lower end of the vertical portion 1B has an arc shape concentric with the center of swing, and a guide protrusion 21a (shown in FIG. 1) provided at the lower end of the time signature switching plate 21 guides to the arc-shaped edge 1d of the vertical portion. It is supposed to be. The vertical portion 1B is provided with an arc-shaped long hole 1e parallel to the arc-shaped edge 1d. A phosphorus 22 is fixed to the upper end of the time signature switching plate 21 with a screw 23. A hitting ball 24 for hitting the phosphorus 22 is provided at the upper end of the hammer plate 25. The hammer plate 25 has a pin 25a as a swing center projecting in the width direction of the hammer plate 25, and this pin 25a is pivotally supported on the beat changeover plate 21 so as to be swingable. The lower end portion of the hammer plate 25 is stretched to form a time selection portion 25b.
[0011]
A mechanism for selecting the time signature to beat will be described. The time signature switching plate 21 is provided with a window hole 21b facing the long hole 1e of the vertical portion 1B. The time signature selection portion 25b of the hammer plate 25 passes through the window hole 21b and passes through the long hole 1e. The second gear 8 is in contact with the side surface. The side surface of the second gear 8 is a rhythm forming surface 8a. For example, when the phosphorus 22 is struck every first beat of the rhythm such as two beats, three beats, four beats, six beats, etc., on the same circumference The recesses 8b are formed at predetermined intervals. Specifically, as shown in FIG. 5, one concave portion 8b and one flat surface having the same central angle so as to strike the first beat of two beats on the outermost circumference of four concentric circumferences. A plurality of pairs of surfaces (rhythm forming surfaces) 8a are aligned. A plurality of pairs of one concave portion 8c and two flat surfaces (rhythm forming surfaces) 8a are aligned on the circumference adjacent to this so as to strike the first beat of three beats. A plurality of pairs of one concave portion 8d and three flat surfaces (rhythm forming surfaces) 8a are aligned in a circumferential shape adjacent to this so as to beat the first beat of four beats. On the innermost circumference, a plurality of pairs of one concave portion 8e and five flat surfaces (rhythm forming surfaces) 8a are aligned so as to beat the first beat of six beats. . The central part is an area that is not provided with a recess, and is an area that is selected when no beat is applied. When the time signature switching plate 21 is swung, the hammer plate 25 is also swung together, and the time selection portion 25b moves along the elongated hole 1e. A desired rhythm can be selected if its tip is brought into contact with a desired circumferential position of the rhythm forming surface 8a.
[0012]
Thus, in the configuration in which the weight 16 is moved to select the frequency, and the desired rhythm is selected by swinging the timepiece switching plate 21, the initial position of the wheel 11 and the initial position of the second gear 8 are assembling. Must match. That is, the initial position of the wheel 11 is a position where the pendulum pin is engaged with one of the relief plates 11c or 11d of the wheel 11, and the initial position of the second gear 8 is determined by the time signature selection unit 25b. This is the position immediately before coming into contact with the first-beat concave portion of the forming surface 8a. If the relative positional relationship between the two initial positions is matched during assembly, the first beat can be beaten immediately after starting.
[0013]
Therefore, a through hole for positioning the second gear 8 and the wheel 11 at the initial position is provided in advance between the second gear 8, the wheel 11, and the vertical portion 1B. That is, one through hole 30a is provided in the wheel 11, and the first positioning through hole 30b is provided in the vertical portion 1B at a position facing the through hole 30a at the initial position of the wheel 11. The second gear 8 is provided with one through hole 31a, and the vertical portion 1B is provided with a second positioning through hole 31b at a position facing the through hole 31a at the initial position of the second gear 8. Keep it. At the time of assembly, one pin passes through the first positioning through hole 30b into the through hole 30a of the wheel 11, and the other pin passes through the second positioning through hole 31b and the second gear 8 through hole 31a. The second shaft 6 and the third shaft 9 are pivotally supported by the vertical portion 1B and the second frame 2. After that, if the pin is pulled out, the relative positional relationship between the initial position of the wheel 11 and the initial position of the second gear 8 can be adjusted, and once assembled, the relative positional relationship between the initial positions will not be shifted. . What is necessary is just to perform as usual, when assembling the 1st axis | shaft 4, phosphorus 22 grade | etc.,.
[0014]
In use, when the weight 16 is moved up and down to determine the frequency, the time signature switching plate 21 is swung, and the time signature selection unit 25b selects a desired rhythm on the rhythm formation surface, for example, 3 time signatures, Align with the position that contacts the second circumference from the outermost circumference. When swinging is started with the pendulum 15 free, the wheel 11 that has been prevented from rotating by the contact of the escape plate 11c or 11d up to that point becomes free, and the driving force of the mainspring 3 becomes the first gear. 5, the second pinion 7, the second gear 8, and the third pinion 10 are transmitted to the wheel 11 to rotate. While the rotation is transmitted to the wheel 11, the second gear 8 starts to rotate. At this time, the time signature selection portion 25 b falls into the recess 8 c and the hammer plate 25 swings around the pin 25 a, and the tip of the hammer plate 25. The hit ball 24 hits the phosphorus 22 and hits the first beat. One beat ends when the pendulum pin comes into contact with the next relief plate 11d or 11c. Therefore, the pendulum 15 starts swinging in the opposite direction and enters the second beat. In this manner, the pendulum 15 swings left and right for each beat, and a rhythm that matches the frequency is formed by striking the first beat of the rhythm.
[0015]
【The invention's effect】
As described above, according to the present invention, the wheel train and the first positioning through hole, and the gear through hole and the second positioning through hole are opposed to each other at the time of assembly, and the transmission wheel train is attached to the frame 1. Therefore, the relative positional relationship between the initial position of the wheel and the initial position of the gear can be set correctly, and it is not necessary to repeat assembly and disassembly, and can always be adjusted to the correct relative positional relationship. It takes less time and can be assembled correctly and easily in a short time.
[Brief description of the drawings]
FIG. 1 is a front view of a mechanism portion showing an embodiment of the present invention.
FIG. 2 is a left side view of FIG.
FIG. 3 is a right side view of FIG. 1;
4 is a plan view of FIG. 1. FIG.
FIG. 5 is a left side view showing a main part.
[Explanation of symbols]
1 Frame 3 Drive source (spring)
5, 7, 8, 10, 11 Transmission wheel train 8 Gear 8a in transmission train wheel Rhythm forming surface 11 Wheel 22 in transmission train wheel Lin 30a Wheel through hole 30b First positioning through hole 31a Gear through hole 31b Second positioning through hole

Claims (1)

Vibrates at a desired frequency via a drive source, a transmission wheel train that transmits the driving force from the drive source, a frame that supports the transmission wheel train, and a wheel that is provided in the transmission wheel train. A pendulum, a rhythm forming surface formed on one gear in the transmission wheel train, and a phosphorus that is controlled by the rhythm forming surface and beats at a desired rhythm,
The wheel has a through hole, and the frame has a first positioning through hole facing the wheel through hole at an initial position of the wheel.
The gear is formed with a through hole, and the frame is formed with a second positioning through hole facing the gear through hole at an initial position of the gear,
The transmission wheel train is assembled to the frame at a position where the through hole of the wheel and the first positioning through hole, and the through hole of the gear and the second positioning through hole face each other. A metronome.

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