JP2013076815A - Hammer device of electronic keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hammer device of an electronic keyboard musical instrument, which is capable of ensuring such a good touch feeling that a player feels that the instrument is worth playing, and is capable of improving performance by allowing a sufficient dynamic load to be easily secured while satisfactorily maintaining response of hammers.SOLUTION: In the hammer device of an electronic keyboard musical instrument is provided with hammers turned in linkage with a depressed key. Each hammer includes an arm-like hammer body 22 supported at a hammer support point and a weight plate 23 provided on the hammer body 22. The hammer is turned around the hammer support point when the hammer body 22 is pressed via a driving point PD by a depressed key. A ratio of a distance LG from a center CH of the hammer support point to a center of gravity GG of the weight plate 23 to a distance LD from the center CH of the hammer support point to the driving point PD is set to 5:1 to 6:1.

Description

  The present invention is applied to an electronic keyboard instrument such as an electronic piano, and relates to a hammer device for an electronic keyboard instrument provided with a hammer that rotates in conjunction with a pressed key.

  The present applicant has already proposed a hammer device for an electronic keyboard musical instrument, for example, in Patent Document 1. As shown in FIG. 4, the hammer 101 includes an arm-shaped hammer body 102 extending in the front-rear direction and a weight 103 attached to the front end of the hammer body 102. The hammer body 102 is made of a synthetic resin, and the weight 103 is made of a metal having a large specific gravity such as iron. A shaft hole 104 is formed at the rear end of the hammer body 102, and the hammer 101 is rotatably supported by the hammer fulcrum by engaging the shaft hole 104 with a hammer fulcrum (not shown). ing.

  A capstan screw 105 is screwed into a position on the lower side of the hammer body 101 in front of the shaft hole 104. The capstan screw 105 is in contact with the rear end portion of the upper surface of a swingable key (not shown). Therefore, when the key is pressed, the hammer 101 is driven via the capstan screw 105 and rotated upward about the hammer fulcrum as the rear side thereof rotates upward. Further, in this hammer 101, the ratio between the distance LG0 from the center CH0 of the hammer fulcrum to the center of gravity GG0 of the weight 103 and the distance LD0 from the center CH0 of the hammer fulcrum to the drive point PD0 where the capstan screw 105 abuts the key is , About 3.7: 1.

JP 2010-262129 A

  As described above, in the conventional hammer, the ratio between the distance LG0 from the center CH0 of the hammer fulcrum to the center of gravity GG0 of the weight 103 and the distance LD0 from the center CH0 of the hammer fulcrum to the drive point PD0 of the capstan screw 105 is At about 3.7: 1, it is relatively small and the former distance LG0 is relatively short. On the other hand, the dynamic load (moment of inertia) of the hammer is substantially proportional to the square of the distance LG0. For this reason, even if the weight 103 is made heavy, the dynamic load does not increase effectively, and the dynamic load tends to be insufficient. There is room for improvement in this regard.

  The present invention has been made to solve the above-described problems, and can easily secure a sufficient dynamic load while maintaining a good response of the hammer. It is an object of the present invention to provide a hammer device for an electronic keyboard instrument that can ensure a feeling and improve performance.

  In order to achieve this object, the invention according to claim 1 is a hammer device for an electronic keyboard instrument comprising a hammer that rotates in conjunction with a depressed key, the hammer being supported by a hammer fulcrum. An arm-shaped hammer body that rotates around the hammer fulcrum by being pressed through the drive point by the depressed key, and a weight provided on the hammer fulcrum, and from the hammer fulcrum The ratio of the distance to the center of gravity of the weight and the distance from the hammer fulcrum to the drive point is set to 5: 1 to 6: 1.

  In this hammer device for an electronic keyboard instrument, the hammer rotates about the hammer fulcrum by being pressed through the drive point by the pressed key. The ratio of the distance from the hammer fulcrum to the center of gravity of the hammer weight and the distance from the hammer fulcrum to the drive point (hereinafter referred to as “lever ratio”) is set to 5: 1 to 6: 1.

  If the lever ratio is smaller than 5: 1 (the distance from the hammer fulcrum to the center of gravity of the weight is relatively short), the dynamic load of the hammer is likely to be insufficient even if the weight is heavy due to the above-mentioned reason. The feeling becomes lighter. On the other hand, if the lever ratio is larger than 6: 1 (the distance from the hammer fulcrum to the center of gravity of the weight is relatively long), the distance that the center of gravity of the hammer moves becomes too large, and the response such as the return of the hammer after pressing the key As a result, the performance is reduced, such as slowing down the key return.

  Therefore, by setting the lever ratio to 5: 1 to 6: 1, it is possible to secure a sufficient dynamic load while maintaining a good response of the hammer, thereby ensuring a good touch feeling with resilience. At the same time, the performance can be improved. Further, it is only necessary to change the setting of the lever ratio, and it is not necessary to add special parts or mechanisms, so that the above-described operation can be obtained easily and inexpensively.

It is a side view which shows the keyboard apparatus of the electronic piano to which the hammer apparatus by one Embodiment of this invention is applied, in the state which partly notched. It is a side view of a hammer. FIG. 3 is a diagram for explaining the relationship between the distance from the hammer fulcrum to the center of gravity of the weight and the distance from the hammer fulcrum to the hammer drive point in the hammer of FIG. It is a figure similar to FIG. 3 regarding the conventional hammer.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a keyboard device of an electronic piano to which a hammer device according to an embodiment of the present invention is applied in a key release state.

  As shown in the figure, the keyboard device 1 includes a large number of keys 2 (only one white key 2a and one black key 2b are shown) arranged in the left-right direction (front and back direction in FIG. 1) of the electronic piano, A keyboard chassis 3 that supports the key 2, a hammer support 4 connected to the rear end (right end in FIG. 1) of the keyboard chassis 3, and provided for each key 2. A number of hammers 5 (only one shown), a number of let-off parts 6 (only one shown) provided for each hammer 5 to give a let-off feeling when the key 2 is depressed, and a key The key switch 7 is used to detect the key depression information 2.

  The keyboard chassis 3 is composed of three support rails 9 including a front rail 9a, a middle rail 9b, and a rear rail 9c extending in the left-right direction, and five reinforcing ribs 10 extending in the front-rear direction, in a cross-beam shape. It is fixed on a shelf board (not shown). Each of these support rails 9 and ribs 10 is composed of an iron plate formed into a predetermined shape by stamping and bending with a press. The plate thickness of the support rail 9 is set to be thinner (for example, 1.0 mm) for weight reduction, and the plate thickness of the rib 10 is set to be thicker (for example, 1.6 mm) for reinforcement.

  A saddle front 11 and a saddle center 12 are fixed to the lower surface of the front rail 9a and the upper surface of the middle rail 9b, respectively. The saddle front 11 and the saddle center 12 are thick plate-shaped members made of synthetic resin, and extend in the left-right direction over the entire front rail 9a and middle rail 9b. A large number of balance pins 13 are erected in a state where the balance 12 is arranged in the left-right direction at the front and rear positions corresponding to the white key 2a and the black key 2b. A large number of front pins 14 are erected on the front 11 in front and rear positions corresponding to the white key 2a and the black key 2b in a state where the front pins 14 are arranged in the left-right direction.

  The key 2 includes a wooden key body 15 extending in the front-rear direction and having a rectangular cross section, and a key cover 16 made of synthetic resin bonded to the upper surface and the front surface of the front portion. A balance pin hole 17 is formed at the center of the key body 15 in the front-rear direction, and the key 2 is swingably supported by the balance pin 13 through the balance pin hole 17. Further, a front pin hole 18 is formed at the front end portion of the key body 15, and the front pin hole 18 engages with the front pin 14, thereby causing a lateral shake when the key 2 rotates. Is prevented.

  The hammer support 4 is made of a synthetic resin, and is formed by connecting a plurality of molded products for one octave, for example, and extends in the left-right direction so as to cover all the hammers 5, and is attached to the rear rail 9 c of the keyboard chassis 3. It is screwed. The hammer support 4 is composed of a hammer support portion 19 standing upright from the vicinity of the rail 9c and a switch mounting portion 20 extending obliquely upward from the upper end portion. A horizontal pin-shaped hammer fulcrum 21 for supporting each hammer 5 is formed at the upper end of the hammer support portion 19.

  The hammer 5 has an arm-shaped hammer body 22 extending in the front-rear direction and a weight plate 23 (only one is shown) attached to the front end portions of the left and right side surfaces thereof. The hammer body 22 is made of a synthetic resin molded product, and the weight plate 23 is made of a metal material such as iron having a relatively large specific gravity. An arc-shaped shaft hole 24 is formed at the rear end of the hammer body 22, and the hammer 5 is rotatably supported by the hammer support 4 by engaging the shaft hole 24 with the hammer fulcrum 21. Has been.

  A capstan screw 25 is screwed into the lower surface of the hammer body 22 at a position immediately in front of the shaft hole 24 so as to be able to advance and retract. The hammer 5 is placed on the rear end portion of the key 2 via the capstan screw 25. Further, a portion between the shaft hole 24 and the capstan screw 25 on the upper surface of the hammer body 22 is an actuator portion 26 for operating the key switch 7 when the key is depressed. Furthermore, a plate-like engagement protrusion 27 that engages with the let-off component 6 when a key is pressed is provided at the center of the upper surface of the hammer body 22 in the front-rear direction.

  The let-off component 6 is formed of a molded product of a predetermined elastic material (for example, a styrene-based thermoplastic elastomer) and is attached to the switch attachment portion 20 of the hammer support 4. The let-off component 6 extends obliquely backward and downward from the switch mounting portion 20, and a head portion 28 is formed at a tip portion thereof via a constricted portion. The head portion 28 faces the engaging protrusion 27 of the hammer 5 in the key release state.

  The key switch 7 includes a switch board 29 made of a printed circuit board and a switch body 30 made of a rubber switch provided for each key 2 on the lower surface of the switch board 29. The switch board 29 has a rear end inserted into the switch mounting portion 20 and is screwed to the switch mounting portion 20 at a central portion. The switch body 30 is attached to the lower surface of the switch substrate 29 and faces the actuator portion 26 of the hammer 5 with a slight gap in the key release state. Furthermore, a hammer stopper 31 made of foamed urethane or the like that restricts the upward rotation of the hammer 5 is provided at the front end of the lower surface of the switch mounting portion 20.

  Next, the operation of the keyboard apparatus 1 having the above configuration will be described. When the key 2 is pressed from the key release state shown in FIG. 1, the key 2 rotates about the balance pin 13 in the counterclockwise direction in FIG. 1, and accordingly, the hammer 5 moves the capstan screw 25. And pivots upward (clockwise in the figure) around the hammer fulcrum 21.

  During the rotation of the hammer 5, the engaging projection 27 engages with the head 28 of the let-off component 6 and presses the let-off component 6 while compressing the let-off component 6 through the head 28. The reaction force acting on the hammer 5 increases. As the rotation of the hammer 5 progresses, the engagement protrusion 27 is disengaged from the head 28, so that the reaction force from the let-off component 6 disappears rapidly. Due to the increase and disappearance of the reaction force of the let-off component 6, a let-off feeling similar to that of an acoustic piano can be obtained.

  Thereafter, the hammer 5 comes into contact with the hammer stopper 31 to complete the upward rotation of the hammer 5. During the upward rotation of the hammer 5, the actuator portion 26 presses the switch body 30 of the key switch 7 and turns on the key switch 7, thereby pressing the key 2 according to the rotation amount of the hammer 5. Key information is detected and output to a sound generation control device (not shown). The sound generation control device controls the sound generation of the electronic piano based on the detected key press information.

  After that, when the key 2 is released, the key 2 rotates in the opposite direction to that when the key is pressed, and returns to the key release state shown in FIG. 1, and the hammer 5 is also rotated downward and released. Return to the key state.

  Next, the configuration of the hammer 5 according to the present invention will be described in detail. As described above, the hammer 5 is composed of a synthetic resin molded product, and is composed of an arm-shaped hammer body 22 extending in the front-rear direction and a metal material, and is attached to the front ends of the left and right side surfaces of the hammer body 22. It consists of weight plates 23, 23 and the like. Further, the hammer 5 is rotatably supported on the hammer fulcrum 21 by the shaft hole 24 engaging with the hammer fulcrum 21.

  As shown in FIG. 2, the front end portion of the hammer body 22 is a weight plate attachment portion 41, and weight plates 23 and 23 are attached to the left and right side surfaces of the weight plate attachment portion 41 by rivets 42. . In addition, three concave portions 43 are juxtaposed along the length direction of the hammer body 22 on the left and right sides of the portion of the hammer body 22 on the rear side of the weight mounting portion 41. The capstan screw 25 described above is screwed into the wall portion of the recess 43 on the rear side from below, and is connected to the rear end portion of the upper surface of the key 2 via the drive point PD (see FIG. 3) of the head portion 25a. It is in contact.

  Further, as shown in FIG. 3, in this hammer 5, the distance from the center CH of the hammer fulcrum 21 to the center of gravity GG of the weight plate 23 is LG, and the capstan screw 105 abuts against the key 2 from the center CH of the hammer fulcrum 21. When the distance to the drive point PD is LD, the lever ratio RL (= LG: LD), which is the ratio of both distances, is set within a range of 5: 1 to 6: 1, for example, 5.3: 1. Has been. The lower dotted line in the figure represents the lower limit distance (= 5 × LD) at which the lever ratio RL is 5: 1, and the upper dotted line is the upper limit distance (= 6 at which the lever ratio RL is 6: 1). XLD).

  According to the present embodiment, since the lever ratio RL is set as described above, a sufficient dynamic load can be ensured while maintaining a good response of the hammer 5, thereby achieving a good touch with a firm response. A feeling can be secured and performance can be improved. Further, it is only necessary to change the setting of the lever ratio RL, and it is not necessary to add special parts or mechanisms, so that the above effect can be obtained easily and inexpensively.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, the lever ratio RL is not limited to that exemplified in the embodiment, and it is needless to say that the lever ratio RL may be in the range of 5: 1 to 6: 1. Thereby, the above-described effects can be obtained similarly.

  In addition, the hammer 5 of the embodiment is a type that is disposed above the swingable key 2 with the center portion as the center, and is pushed up by the key 2 that is pressed and rotated, but the present invention is not limited thereto. Not limited to other types of hammers. For example, the invention can also be applied to a hammer of a type that is arranged below a key that rotates around a rear end portion, and is pressed down by a pressed key to rotate. In addition, the detailed configuration can be appropriately changed within the scope of the gist of the present invention.

2 key 2a white key 2b black key 5 hammer 21 hammer fulcrum 22 hammer body 23 weight plate (weight)
GG Center of gravity of the PD PD Driving point of the hammer LG Distance from the hammer fulcrum to the center of gravity of the LD LD Distance from the hammer fulcrum to the driving point of the hammer RL Lever ratio

Claims (1)

A hammer device for an electronic keyboard instrument comprising a hammer that rotates in conjunction with a depressed key,
The hammer is
An arm-shaped hammer body that rotates around the hammer fulcrum by being supported by the hammer fulcrum and pressed through the drive point by the depressed key;
A weight provided on the hammer body,
A hammer of an electronic keyboard instrument, wherein a ratio of a distance from the hammer fulcrum to the center of gravity of the weight and a distance from the hammer fulcrum to the drive point is set to 5: 1 to 6: 1 apparatus.

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