JP2010266719A - Touch-weight adjusting device for keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch-weight adjusting device for keyboard instruments capable of increasing or reducing the touch weight, according to the operation amount of the operation member over the entire operation range of an operation member so as to readily adjust the touch weight. <P>SOLUTION: The device includes a slider 11 provided movably in the front and back direction, a plurality of weight levers 12 placed on a weight placing pin 7 and supported by a supporting rail 22 rotatably about a pivot 26; an operation dial 13 provided movably so as to be operated for adjustment of the touch weight of keyboards 2; and a slider driving mechanism 14, provided between the operation dial 13 and the slider 11 for making the slider 11 move in the front and in the back direction, linking with the operation of the operation dial 13 so that the moved amount degree of change of the slider 11, with respect to the operation amount of the operation dial 13, is made smaller, as the pivots 26 of the weight levers 12 approach the weight placing pin 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is applied to a keyboard instrument such as a piano, and relates to a touch weight adjusting device for a keyboard instrument that adjusts the touch weight of the keyboard.

  As a conventional touch weight adjusting device, for example, one disclosed in Patent Document 1 already filed by the present applicant is known. As a third embodiment applied to an upright piano, this touch weight adjusting device includes a plurality of weight levers provided for each key, and a slide rail that supports these weight levers and is slidable in the front-rear direction. And an arm that is connected to the slide rail and is operated to adjust the touch weight of the keyboard.

  Each weight lever extends in the front-rear direction and is supported by a slide rail at its front end so as to be freely rotatable, and a lever receiving screw projecting at a predetermined position behind the balance pin as a pivot fulcrum of the key. It is placed. Thereby, the load by the weight lever acts on the key via the lever receiving screw, and the touch weight of the key increases by the amount of the load.

  The arm extends in the vertical direction, and is rotatably supported by the piano main body at the lower end portion. The central portion in the length direction is connected to the slide rail. Accordingly, when the upper end portion of the arm is moved in the front-rear direction, the slide rail moves in the front-rear direction, and all the weight levers also move in the front-rear direction together with this.

  In the touch weight adjusting apparatus configured as described above, when adjusting the touch weight of the keyboard to be increased, the arm is operated so that the upper end portion thereof moves backward. By operating this arm, the slide rail moves backward according to the amount of operation, and the weight lever also moves backward together with this. In this case, the pivot point of the front end of the weight lever approaches the lever receiving screw on which the weight lever is placed, and the load acting on the key via the lever receiving screw gradually increases. Along with this, the touch weight of the keyboard gradually increases.

Japanese Patent Laying-Open No. 2005-31464 (FIG. 4-5)

  However, in this touch weight adjusting device, when the arm is operated so that the touch weight becomes the largest from the smallest state, the touch weight is the same as the arm is operated from the beginning of the operation to the middle of the operation. After that, the touch weight suddenly increases as the arm operation ends. This is due to the following reason. That is, in this touch weight adjusting device, since the slide rail is directly connected to the arm, the weight lever moves together with the slide rail as much as the arm is operated. That is, the change degree of the movement amount of the weight lever is substantially constant with respect to the operation amount of the arm over the entire operation range of the arm. Also, when the pivot point of the front end of the weight lever approaches the lever receiving screw by operating the arm, the weight of the portion on the free end (rear end) side of the lever receiving screw of the weight lever gradually increases, The distance between the center of gravity of the portion and the lever receiving screw gradually increases. For this reason, the degree of increase in the moment around the pivot point of the weight lever increases as the pivot point of the weight lever approaches the lever receiving screw in a range where the pivot point of the weight lever is relatively close to the lever receiving screw. . Thereby, the degree of increase in the load acting on the key via the lever receiving screw is increased, and the touch weight is rapidly increased.

  As described above, in the above-described touch weight adjusting device, there is a range in which the arm operation amount and the increase / decrease degree of the touch weight do not coincide with each other in the arm operation range. Difficult to make fine adjustments. Therefore, there is room for improvement in this touch weight adjusting device.

  The present invention has been made to solve the above-described problems. The touch weight can be increased or decreased according to the operation amount of the operation member over the entire operation range of the operation member. An object of the present invention is to provide a touch weight adjusting device for a keyboard instrument that can be easily adjusted.

  In order to achieve the above object, the invention according to claim 1 is a keyboard instrument having a plurality of keys each extending in the front-rear direction and rotatably supported by a fulcrum in the vicinity of the center and arranged in parallel in the left-right direction. A keyboard instrument touch weight adjusting device for adjusting the keyboard touch weight, comprising a weight support portion extending in the left-right direction above a plurality of keys, and a slider movable in the front-rear direction, and each key Each of which extends in the front-rear direction and is pivotally supported by the weight support portion about a support shaft extending in the left-right direction at one end, and is provided at a predetermined position behind the fulcrum of the key. A plurality of weights that are placed on the placement unit and that rotate in conjunction with the corresponding keys; an operation member that is configured to be movable and that is operated to adjust the touch weight of the keyboard; and Between the sliders, The slider is moved back and forth in conjunction with the operation of the member, and the degree of change in the amount of movement of the slider relative to the amount of operation of the operation member is made smaller as the spindle of the weight approaches the key placement portion. And a configured slider drive mechanism.

  According to this configuration, the weight support portion of the slider extends in the left-right direction above the plurality of keys arranged in parallel in the left-right direction, and the plurality of weights are interlocked with each key on the weight support portion. It is supported to rotate. Specifically, each weight extends in the front-rear direction and is supported at one end so as to be rotatable about a support shaft extending in the left-right direction, and placed at a predetermined position behind the fulcrum of the key. It is placed on the part. As a result, a load due to the weight acts on the key via the placement portion, and the touch weight of the key increases by the amount of the load.

  In conjunction with the operation of the operation member, the slider is driven in the front-rear direction by the slider drive mechanism, and all the weights move in the front-rear direction together with this. In this case, when the spindle of the weight approaches the key placement portion, the weight of the portion on the free end side of the weight with the placement portion as a boundary gradually increases and the distance between the center of gravity of the portion and the placement portion Will gradually increase. For this reason, the moment around the spindle of the weight increases as the spindle is closer to the mounting part. In particular, in the range where the spindle of the weight is relatively close to the mounting part, the spindle approaches the mounting part. As the speed increases, the moment increases. As a result, the load of the weight acting on the key via the placement section also increases as the spindle of the weight is closer to the placement section, and the spindle is relatively close to the placement section. As the placement portion is approached, the degree of increase in load increases.

  Further, the slider drive mechanism is configured such that the degree of change in the slider movement amount relative to the operation amount of the operation member becomes smaller as the spindle of the weight approaches the key placement portion. For this reason, the increase in the increase degree of the load with respect to the operation amount of the operation member can be suppressed by offsetting the increase in the increase degree of the load and the decrease in the change degree of the movement amount of the slider by the slider driving mechanism. As a result, the load change has a substantially linear relationship with the operation amount of the operation member, including the range in which the spindle of the weight is relatively close to the placement portion, and as a result, the touch weight of the keyboard is reduced. Changes also have a substantially linear relationship. Therefore, according to the present invention, the touch weight can be increased or decreased according to the operation amount of the operation member over the entire operation range of the operation member, and the touch weight can be easily adjusted.

  According to a second aspect of the present invention, in the keyboard instrument touch weight adjusting device according to the first aspect, the slider driving mechanism extends in a direction orthogonal to the moving direction of the slider in conjunction with the operation of the operating member. The rotating member is configured to be rotatable around a rotating shaft, and has a rotating member that engages with the slider via an engaging portion at a predetermined distance in the radial direction from the rotating shaft. When the slider moves through the engaging portion along with the rotation and the spindle of the weight comes closest to the key mounting portion, the engaging portion moves forward or backward with respect to the rotating shaft. It is characterized by facing from behind.

  According to this configuration, the slider driving mechanism has the rotating member that is rotatable about the rotating shaft that extends in the direction orthogonal to the moving direction of the slider. It rotates in conjunction with the operation. The rotating member is provided with an engaging portion at a position separated from the rotating shaft by a predetermined distance in the radial direction, and a slider is engaged with the engaging portion. By the operation of the operating member, the rotating member rotates, and accordingly, the slider moves through the engaging portion. When the spindle of the weight moving together with the slider comes closest to the key mounting portion, the engaging portion of the rotating member faces the rotating shaft from the front or the rear in the front-rear direction.

  In this case, while the rotation angle of the rotation member changes according to the operation amount of the operation member, the amount of movement of the engagement portion of the rotation member in the front-rear direction is determined as follows. That is, for example, the position when the rotating shaft of the rotating member extends in the vertical direction and the engaging portion of the rotating member faces the rotating shaft from the left or the right in the left-right direction is the reference position. Assuming (value 0), the amount of movement of the engagement portion in the front-rear direction is a value obtained by multiplying the distance from the rotation shaft to the engagement portion by the sine value of the rotation angle of the rotation member. That is, the amount of movement of the engaging portion in the front-rear direction increases as the turning angle of the turning member from the reference position increases, and the engaging portion faces the turning shaft from the front or the rear in the front-rear direction. As the position approaches, the degree of change in the movement amount decreases. Therefore, by using the slider driving mechanism having the rotating member as described above, it is possible to easily realize the operation and effect of the first aspect described above.

  According to a third aspect of the present invention, in the touch weight adjustment device for a keyboard instrument according to the first or second aspect, the operation member is configured to be rotatable about an axis extending in one of the vertical direction and the horizontal direction. It is characterized by being.

  According to this configuration, since the operation member is rotatable about the axis extending in one of the vertical direction and the horizontal direction, when adjusting the touch weight, the operation member is moved clockwise or counterclockwise. By rotating, the touch weight can be easily adjusted. Further, for example, the operation member is installed in a so-called dial type that rotates around an axis passing through the center of the operation member. The space can be reduced, and the appearance of the keyboard instrument can be maintained well.

  According to a fourth aspect of the present invention, in the keyboard instrument touch weight adjusting device according to the first or second aspect, the operation member is configured to be movable in the front-rear direction.

  According to this configuration, since the operation member is movable in the front-rear direction, the touch weight can be easily adjusted by moving the operation member forward or backward when adjusting the touch weight. be able to.

  According to a fifth aspect of the present invention, in the keyboard instrument touch weight adjusting device according to any one of the first to fourth aspects, the device further comprises a lock mechanism that locks the operating member at an arbitrary position moved by the operation. It is characterized by being.

  According to this configuration, when adjusting the touch weight, the operation member is operated while being moved, and the touch weight of the keyboard is set to a desired touch weight. Then, the operation member is locked by the lock mechanism. Thus, by locking the operation member, the touch weight of the keyboard can be easily maintained at the set desired touch weight. Further, the operation member does not move due to the vibration of the keyboard instrument accompanying the performance, and the touch weight can be stably maintained during the performance.

The keyboard of the upright piano to which the touch weight adjusting device by 1st Embodiment of this invention is applied, and its periphery are shown partially, (a) Top view, (b) Left side view. It is explanatory drawing for demonstrating operation | movement of the rotation lever by operation of an operation dial, (a) The state when a touch weight becomes the minimum, (b) The state when a touch weight becomes the maximum is shown. It is explanatory drawing for demonstrating the position of the weight lever in a touch weight adjustment apparatus, and shows the position respectively corresponding to Fig.2 (a) and (b). It is a graph which shows the relationship between the position of the weight mounting pin which mounts a weight lever, and the load which acts on a key. (A) The graph which shows the relationship between the moving amount of a weight mounting pin, and the load which acts on a key, (b) The relationship between the rotation angle from the reference position of a rotation lever and the moving amount of a weight mounting pin is shown. It is a graph which shows the relationship between the operation amount of an operation dial, and a touch weight. It is a top view which shows the modification of a slider drive mechanism. It is a top view which shows the modification of a slider drive mechanism. It is a top view which shows the touch weight adjusting device by 2nd Embodiment of this invention, (a) The state when a touch weight becomes the minimum, (b) The state when a touch weight becomes the maximum is shown. It is a left view which shows the touch weight adjusting device by 3rd Embodiment of this invention, (a) A state when a touch weight becomes the minimum, (b) A state when a touch weight becomes the maximum is shown. . It is a figure which shows the lock mechanism of an operation dial, (a) Unlocked state and (b) Locked state are shown. It is a figure which shows the lock mechanism of an operation lever, (a) Top view, (b) A locked state, (c) An unlocked state is shown.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 partially shows a keyboard of an upright piano (hereinafter simply referred to as “piano”) to which the touch weight adjusting device according to the first embodiment of the present invention is applied, and its periphery. As shown in the figure, this piano 1 (keyboard instrument) is provided for each key 2a having a plurality of keys 2a (only three are shown in FIG. 1 (a)) and for each key 2a. A plurality of actions 3 (not shown in FIG. 1A, only one shown in FIG. 1B) to be operated, a touch weight adjusting device 4 for adjusting the touch weight of the keyboard 2, and the like are provided.

  The keyboard 2 is supported from below by a cross-girder-shaped cage (only 5 in the cage is shown) placed on a shelf board (not shown). Specifically, the plurality of keys 2a of the keyboard 2 are juxtaposed in the left-right direction (vertical direction in FIG. 1A), and each key 2a extends in the front-rear direction (left-right direction in FIG. 1). In the vicinity of the center in the length direction, it is rotatably supported by a balance pin 6 (fulcrum) erected in the cage 5. In addition, a weight placing pin 7 (mounting portion) that protrudes upward at a predetermined position behind the balance pin 6 (leftward in FIG. 1) and places a weight lever 12 described later is fixed to the key 2a. Has been. Each action 3 transmits the key pressing force of the key 2a to a hammer (not shown), and a pivotable whippen 3a placed on the rear end of the key 2a via a capstan 8; The whippen 3a has a jack 3b supported rotatably. By pressing the key, the whippen 3a or the jack 3b of the corresponding action 3 is rotated, so that the hammer is rotated.

  The touch weight adjusting device 4 is provided for each of the sliders 11 that are movable in the front-rear direction and each key 2 a and adjusts the touch weights of the weight levers 12 (weights) supported by the sliders 11 and the keyboard 2. An operation dial 13 (operation member) that is operated for this purpose and a slider drive mechanism 14 that drives the slider 11 in the front-rear direction in conjunction with the operation of the operation dial 13 are provided.

  The slider 11 has two left and right columns 21 (only the left one is shown in FIG. 1B) arranged so as to extend vertically on both sides of the keyboard 2, and between the columns 21 and 21 above the keyboard 2. The weight support rails 22 (weight support portions) that extend in the left-right direction and are respectively fixed to the upper end portions of the corresponding columns 21 are provided. Each support column 21 is formed in an inverted T shape on the side surface, and is supported by a guide rail 23 mounted on the shelf so as to extend in the front-rear direction so as to be movable in the front-rear direction via a bearing 24. Yes. Further, the weight support rails 22 project rearwardly at predetermined intervals along the length direction thereof, and a plurality of weight support portions 22a for supporting the weight levers 12 (only three in FIG. 1A). (Shown).

  Each weight lever 12 is configured by a lever portion 27 that extends in the front-rear direction and has a prismatic shape, and a weight main body 28 that is fixed to the rear end portion of the upper surface of the lever portion 27. The lever portion 27 has a front end portion formed in a bifurcated shape, and a support shaft 26 that penetrates through and extends in the left-right direction with the weight support portion 22a of the weight support rail 22 interposed inside the front end portion. Is supported by the weight support portion 22a so as to be rotatable. The weight body 28 is made of a metal such as iron in a block shape and has a predetermined weight.

  The weight lever 12 configured as described above is placed on the weight placing pin 7 of the corresponding key 2a. Thereby, the load by the weight lever 12 acts on the key 2a via the weight mounting pin 7, and the touch weight of the key 2a increases by the amount of the load.

  The operation dial 13 is formed in a columnar shape having a predetermined diameter and height, and is provided on a beat tree (not shown) arranged on the left side of the keyboard 2. Further, the operation dial 13 has a rotating shaft 29 that extends downward from the center of the lower surface for a predetermined length and penetrates the beat tree. It can be rotated clockwise and counterclockwise in a).

  The slider drive mechanism 14 is horizontally extended by a predetermined length, and a rotation lever 30 (rotation member) whose base is fixed to the lower end of the rotation shaft 29 is extended by a predetermined length in the front-rear direction, and the rear end is It is connected to the lower end portion of the left column 21, and the front end portion engages with the tip end portion of the rotating lever 30, thereby having a connecting member 31 that connects the slider 11 and the rotating lever 30. .

  The rotating lever 30 is provided with an engaging convex portion 30a (engaging portion) protruding downward at the tip thereof. Further, the connecting member 31 is formed with an engaging groove 31a which is open to the left and has a U-shaped planar shape at the front end thereof. The engaging groove 31a is formed to be slightly longer than the rotating lever 30, and the engaging convex portion 30a of the rotating lever 30 is slidably engaged inside.

  Next, the operation of the touch weight adjusting device 4 when adjusting the touch weight of the keyboard 2 will be described with reference to FIGS. FIG. 2A shows the operation dial 13 and its surroundings, and is a state when the touch weight is minimized. In this state, the rotation lever 30 extends in the left-right direction, and the engagement protrusion 30 a faces the rotation shaft 29 from the left in the left-right direction. That is, the engaging convex portion 30a is located on the left side of the rotation shaft 29 (hereinafter, the position of the rotation lever 30 and the operation dial 13 at this time is referred to as “reference position”). Further, in this state, as shown in FIG. 3A, the lower surface rear end portion of the weight lever 12 is placed on the weight placing pin 7 of the key 2a.

  When the operation dial 13 is turned clockwise from the state shown in FIG. 2A, the rotation lever 30 rotates integrally with the operation dial 13 via the rotation shaft 29. In this case, as the engaging convex portion 30a of the turning lever 30 moves rearward (upward in FIG. 2), the connecting member 31 engaged with the engaging convex portion 30a also moves rearward. As a result, as shown in FIG. 3, the slider 11 also moves backward (leftward in FIG. 3), and all the weight levers 12 supported thereby also move backward. As the weight lever 12 moves rearward in this way, the support shaft 26 at the front end thereof approaches the weight placing pin 7 on which the weight lever 12 is placed. In other words, the weight placing pin 7 relatively approaches the support shaft 26 of the weight lever 12.

  FIG. 4 shows the relationship between the position of the weight mounting pin 7 with respect to the weight lever 12 and the load acting on the key 2a via this. As shown in the figure, as the weight placing pin 7 relatively approaches the support shaft 26 of the weight lever 12, the load of the weight lever 12 acting on the key 2a via the weight placing pin 7 gradually increases. . As described above, when the weight placing pin 7 approaches the support shaft 26 of the weight lever 12, the weight of the portion on the free end (rear end) side of the weight lever 12 with the weight placing pin 7 as a boundary, and This is because the moment around the support shaft 26 of the weight lever 12 gradually increases as the distance between the center of gravity of the portion and the weight mounting pin 7 gradually increases.

  Thus, as the load acting on the key 2a through the weight mounting pin 7 increases, the touch weight of the key 2a also increases. Then, when the operation dial 13 is further turned and the rotation lever 30 is rotated 90 ° from the reference position as shown in FIG. 2B, the engagement convex portion 30a is moved in the front-rear direction with respect to the rotation shaft 29. Opposite from behind. That is, the engaging convex portion 30 is located immediately behind the rotation shaft 29. In this case, as shown in FIG. 3B, the weight placing pin 7 is closest to the support shaft 26 of the weight lever 12, whereby a load acting on the key 2 a via the weight placing pin 7 is applied. By becoming the maximum, the touch weight is also maximized.

  Further, as shown in FIGS. 4 and 5 (a), in the range where the weight placing pin 7 is relatively close to the support shaft 26 of the weight lever 12, the degree of increase of the moment becomes larger, so that it acts on the key 2a. The degree of increase in the load to be increased also increases. On the other hand, the amount of movement of the weight lever 12 that accompanies the turning operation of the operation dial 13, in other words, the amount of movement of the weight mounting pin 7 that moves relative to the weight lever 12 (hereinafter referred to as "the weight mounting pin 7"). As shown in FIG. 5B, the movement amount is increased as the rotation angle of the operation dial 13 from the reference position (0 ° in FIG. 5) increases. However, the movement amount of the weight mounting pin 7 is such that the rotation angle of the operation dial 13 is 90 °, that is, the position where the engagement convex portion 30a of the rotation lever 30 is directly behind the rotation shaft 29 (FIG. 2B). As it gets closer to (see), the degree of increase becomes smaller. This is because the amount of movement of the weight mounting pin 7 is a value obtained by multiplying the distance from the rotation shaft 29 of the rotation lever 30 to the engagement convex portion 30a by the sine value of the rotation angle of the rotation lever 30. Because. Therefore, the degree of increase in the amount of movement of the weight lever 12 is smaller in the range where the weight mounting pin 7 is relatively close to the support shaft 26 of the weight lever 12, contrary to the change in the degree of increase in load described above.

  As described above, when operating the operation dial 13 so that the touch weight becomes the largest from the smallest state, when the operation dial 13 is turned clockwise and the turning lever 30 starts to turn from the reference position, From the beginning of the operation of the operation dial 13 to the middle of the operation, all the weight levers 12 move backward according to the operation amount, and therefore the touch weight gradually increases according to the operation amount of the operation dial 13. . Thereafter, as the operation end of the operation dial 13 is approached, the increase in the load of the weight lever 12 acting on the key 2a via the weight mounting pin 7 increases, but the increase in the amount of movement of the weight lever 12 decreases. Therefore, these cancellations can suppress an increase in the degree of load increase with respect to the operation amount of the operation dial 13. As a result, the change in the load has a substantially linear relationship with the operation amount of the operation dial 13 including the range in which the weight placing pin 7 is relatively close to the support shaft 26 of the weight lever 12. As shown in FIG. 5C, the change in the touch weight of the keyboard 2 has a substantially linear relationship.

  As described above, according to the present embodiment, the amount of increase / decrease in the touch weight has a substantially linear relationship with the operation amount of the operation dial 13, so that the operation amount can be controlled over the entire operation range of the operation dial 13. Accordingly, the touch weight can be increased or decreased, and the adjustment of the touch weight can be easily performed including fine adjustment. Further, since the operation dial 13 is of a dial type that itself is operated to rotate, the installation space on the beat tree can be made relatively small, whereby the appearance of the piano 1 can be maintained well.

  FIG. 6 shows a modified example of the slider drive mechanism. The slider drive mechanism 41 is of a type in which the slider 11 and the rotating lever 30 are connected via a wire. As shown in the figure, the slider drive mechanism 41 includes a wire 42, a wire guide 43 that guides the wire 42 in a state of passing through the inside, and a gap between the wire guide 43 and the left column 21 of the slider 11. The spring 44 etc. which are arrange | positioned and urge the slider 11 back are provided.

  The wire 42 is disposed so as to extend a predetermined length in the front-rear direction, the front end portion is a wire attachment portion 30 b (engagement portion) at the front end portion of the rotary lever 30, and the rear end portion is a front end portion of the column 21 of the slider 11. It is attached to the attaching part 21a provided in the. The wire guide 43 is formed in a cylindrical shape extending in the front-rear direction, and is disposed between the support column 21 and the rotation lever 30 while being fixed on the shelf board.

  The spring 44 is constituted by a coil spring, and the front end is attached to the rear end portion of the wire guide 43 and the rear end portion is attached to the attachment portion 21a of the support column 21 with the wire 42 passed through the spring 44. Yes. Further, a guide member 45 is provided between the rotating lever 30 and the wire guide 43 so that the wire 42 is in sliding contact with the wire 42 and smoothly guides the wire 42 while applying tension thereto.

  In the touch weight adjusting device 4 having the slider driving mechanism 41 configured as described above, for example, when the operation dial 13 is rotated counterclockwise from the state shown in FIG. 30 also rotates. Accordingly, the wire 42 is pulled forward, and the slider 11 coupled thereto is driven forward against the urging force of the spring 44. Thereby, the weight lever 12 moves forward, and the touch weight of the keyboard 2 is reduced. On the other hand, when the operation dial 13 is rotated clockwise from the state shown in FIG. 6, the wire 42 is fed backward and the slider 11 is driven backward by the biasing force of the spring 44. As a result, the weight lever 12 moves backward, and the touch weight of the keyboard 2 increases.

  As described above, according to the touch weight adjusting device 4 provided with the slider drive mechanism 41, the entire operation range of the operation dial 13 is set according to the operation amount as in the case where the slider drive mechanism 14 is provided. The touch weight can be increased or decreased, and the touch weight can be easily adjusted. Further, since the slider drive mechanism 41 connects the slider 11 and the rotating lever 30 via the wire 42, the degree of freedom of the installation position of the operation dial 13 can be increased, and the piano type and model are flexible. It can correspond to.

  FIG. 7 shows another modification of the slider drive mechanism. The slider drive mechanism 51 is of a type in which the rotation shaft 29 of the operation dial 13 and the rotation lever 30 are connected via a gear. . The slider drive mechanism 51 includes a small-diameter gear 52 fixed to the rotation shaft 29 and a large-diameter gear 53 that meshes with the small-diameter gear 52 and is fixed to a support shaft 30 c as a rotation fulcrum of the rotation lever 30. .

  The small diameter gear 52 and the large diameter gear 53 are both spur gears, and the large diameter gear 53 has a diameter almost twice that of the small diameter gear 52. Further, an engaging convex portion 30a similar to the rotary lever 30 of the slider drive mechanism 14 or the rotary lever 30 of the slider drive mechanism 41 is provided at the tip of the rotary lever 30 to which the large-diameter gear 53 is fixed. The same wire attaching part 30b as is provided. Therefore, in the former case, the rotating lever 30 is engaged with the connecting member 31 via the engaging convex portion 30a as in the slider drive mechanism 14, and in the latter case, as in the slider drive mechanism 41. It is connected to the wire 42 via the wire attachment portion 30b.

  In the touch weight adjusting device 4 having the slider driving mechanism 51 configured as described above, for example, when the operation dial 13 is rotated clockwise from the state shown in FIG. The rotation lever 30 rotates counterclockwise. Along with this, the slider 11 is driven forward via the connecting member 31 or the wire 42, and the weight lever 12 is moved forward together with this, so that the touch weight of the keyboard 2 is reduced. On the other hand, when the operation dial 13 is rotated counterclockwise from the state shown in FIG. 7, the rotation lever 30 is rotated clockwise, and the slider 11 is driven rearward. As a result, the weight lever 12 moves backward, and the touch weight of the keyboard 2 increases.

  As described above, according to the touch weight adjusting device 4 provided with the slider drive mechanism 51, the operation amount can be controlled over the entire operation range of the operation dial 13, as in the case where the slider drive mechanism 14 or 41 is provided. Accordingly, the touch weight can be increased or decreased, and the touch weight can be easily adjusted. In the slider drive mechanism 51, the diameter of the large-diameter gear 53 is almost twice that of the small-diameter gear 52, so that the operation dial 13 is rotated about 180 ° in order to rotate the rotation lever 30 by 90 °. Will be moved. By increasing the operation amount of the operation dial 13 in this way, it is possible to easily perform fine adjustment of the touch weight, and it is possible to further easily adjust the touch weight.

  Next, a touch weight adjusting device according to a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6A, the touch weight adjusting device 61 according to the present embodiment includes a slide operation type operation lever 62 (operation member) unlike the rotation operation type operation dial 13 of the first embodiment. Adopted. In the following description, the same components as those in the touch weight adjusting device 4 of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  The touch weight adjusting device 61 includes an operation lever 62 and a slider driving mechanism 63 that connects the operation lever 62 and the slider 11 and drives the slider 11 in the front-rear direction in conjunction with the operation of the operation lever 62. ing.

  The operation lever 62 has a lever main body 62a extending a predetermined length in the vertical direction (front and back direction in FIG. 8), and a knob portion 62b is provided at the upper end thereof. The lever main body 62a is formed in a long and narrow prismatic shape, penetrates a guide hole 64a extending in the front-rear direction of the lever guide 64 provided in the beat tree, and has a lower end provided on a shelf rail (not shown). Slidable in the front-rear direction.

  The slider driving mechanism 63 is fixed to a rotating lever 66 (rotating member) rotatably provided between the operation lever 62 and the slider 11 and a lower end portion of the lever main body 62a. And a slider-side engagement member 68 that is connected to the left column 21 of the slider 11 and that engages with the rotation lever 66.

  The rotation lever 66 is formed in a V shape having a predetermined bending angle (for example, 135 °) in a planar shape, and a rotation shaft 66a (rotation shaft) protruding upward from the shelf plate at the bent portion. Is supported so as to be rotatable around the center. Further, on the upper surface of the rotating lever 66, a lever-side engaging convex portion 66b protruding upward is provided at the tip of the operation lever 62, and the slider side protruding upward is provided at the tip of the slider 11 side. An engagement convex portion 66c (engagement portion) is provided.

  The lever-side engagement member 67 has a U-shaped engagement groove 67a whose planar shape extends in the left-right direction and opens to the right. The lever side engaging convex portion 66b of the rotating lever 66 is slidably engaged with the engaging groove 67a. On the other hand, the slider-side engagement member 68 has a U-shaped engagement groove 68a having a planar shape extending in the left-right direction and opened leftward. The slider side engaging convex portion 66c of the rotating lever 66 is slidably engaged with the engaging groove 68a.

  Next, the operation of the touch weight adjusting device 61 will be described. FIG. 8A shows a state in which the touch weight is minimized. In this state, the operation lever 62 and the lever-side engagement member 67 have the rear end of the guide hole 64a (the upper end of FIG. 8A). ) Located in the vicinity. Further, in this state, the rotating lever 66 has the lever-side engaging convex portion 66b located obliquely to the left of the rotating shaft 66a, and the slider-side engaging convex portion 66c is located on the right side of the rotating shaft 66a. (Hereinafter, the position of the rotating lever 66 at this time is referred to as a “reference position”).

  From this state, when the knob 62b is pinched and the operation lever 62 is slid forward, the lever side engaging member 67 moves forward together with the operation lever 62, and accordingly, the rotating lever 66 is rotated by the rotating shaft 66a. It rotates counterclockwise around the center. Further, along with the rotation of the rotation lever 66, the slider side engaging member 68 moves rearward, and the slider 11 and all the weight levers 12 supported by the slider 11 move rearward. As a result, as in the first embodiment, as the load acting on the key 2a through the weight mounting pin 7 increases, the touch weight of the key 2a increases.

  Then, the operation lever 62 is further slid forward, and as shown in FIG. 8B, when the operation lever 62 reaches the vicinity of the front end of the guide hole 64a and the rotation lever 66 rotates 90 ° from the reference position, The slider-side engagement convex portion 66c is positioned directly behind the rotation shaft 66a. In this case, as in the first embodiment, the weight placing pin 7 is relatively closest to the support shaft 26 of the weight lever 12, thereby causing a load acting on the key 2 a via the weight placing pin 7. By becoming the maximum, the touch weight is also maximized. Further, in this touch weight adjusting device 61, as in the first embodiment, the change in the load has a substantially linear relationship with the operation amount of the operation lever 62, and the change in the touch weight of the keyboard 2 also occurs. Has a substantially linear relationship.

  As described above, according to the present embodiment, the amount of increase / decrease in the touch weight has a substantially linear relationship with the operation amount of the operation lever 62, so that the operation amount is maintained over the entire operation range of the operation lever 62. Accordingly, the touch weight can be increased or decreased, and the touch weight can be easily adjusted as in the first embodiment.

  Next, a touch weight adjusting device according to a third embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6A, the touch weight adjusting device 71 according to the present embodiment employs a rotation operation type operation lever 72 (operation member). In the following description, like the second embodiment, the same components as those of the touch weight adjusting device 4 of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. Shall.

  The touch weight adjusting device 71 includes an operation lever 72 and a slider driving mechanism 73 that connects the operation lever 72 and the slider 11 and drives the slider 11 in the front-rear direction in conjunction with the operation of the operation lever 72. ing.

  The operation lever 72 has a lever main body 72a extending a predetermined length in the vertical direction, and a knob portion 72a is provided at an upper end portion thereof. The lever main body 72a is fixed to the outer peripheral portion of a disk 74 (described later) of the slider drive mechanism 73 at the lower end thereof.

  The slider drive mechanism 73 is formed in a circular shape with a side surface having a diameter of a predetermined length, and is engaged with a disk 74 (rotating member) that is rotatable about a rotating shaft 74 a extending in the left-right direction, and the disk 74. The disk 74 and a connecting member 75 for connecting the slider 11 are provided. On the left side surface of the disk 74, there is provided an engaging convex portion 74b (engaging portion) that protrudes outward from the rotating shaft 74a by a predetermined distance in the radial direction. On the other hand, the connecting member 75 is formed with an engaging groove 75a that is open upward and has a U-shaped side surface at its front end. The engaging groove 75a is formed to be slightly longer than the diameter of the disk 74, and the engaging convex part 74b of the disk 74 is slidably engaged with the inside.

  In the touch weight adjusting device 71 configured as described above, FIG. 9A shows a state when the touch weight is minimized. In this state, the operation lever 72 is tilted rearward (leftward in the figure), and the engaging convex portion 74b of the disk 74 is positioned directly below the rotation shaft 74a (hereinafter, the disk 74 at this time The position is called “reference position”).

  From this state, when the knob 72b is pinched and the operation lever 72 is operated forward, the disk 74 rotates clockwise about the rotation shaft 74a integrally therewith. In this case, as the engaging convex portion 74b of the disk 74 moves rearward, the connecting member 75 engaged with the engaging convex portion 74b also moves rearward, and is integrally supported by the slider 11 and this. All the weight levers 12 moved rearward. As a result, as in the first and second embodiments, as the load acting on the key 2a via the weight mounting pin 7 increases, the touch weight of the key 2a increases.

  Then, when the operation lever 72 is further operated forward, the operation lever 72 reaches the position shown in FIG. 9B, and the disk 74 is rotated by 90 ° from the reference position, the engagement convex portion 74b is moved to the rotation shaft. It is located directly behind 74a. In this case, as in the first and second embodiments, the weight placing pin 7 is relatively closest to the support shaft 26 of the weight lever 12, thereby acting on the key 2 a via the weight placing pin 7. When the load to be maximized, the touch weight is also maximized. Further, in this touch weight adjusting device 71, as in the first and second embodiments, the change in the load has a substantially linear relationship with respect to the operation amount of the operation lever 72. These changes also have a substantially linear relationship.

  As described above, according to the present embodiment, the amount of increase / decrease in the touch weight has a substantially linear relationship with the operation amount of the operation lever 72, so that the operation amount is maintained over the entire operation range of the operation lever 72. Accordingly, the touch weight can be increased or decreased, and the touch weight can be easily adjusted as in the first and second embodiments.

  In the touch weight adjusting devices 4, 61 and 71 of the above embodiments, a lock mechanism for locking the operation dial and the operation lever described above may be provided in order to maintain the set touch weight.

  FIG. 10 shows a lock mechanism applied to a rotary operation type operation dial. As shown in FIG. 6A, the lock mechanism 81 is provided on an operation dial 82 that can be pushed down and on the side of the operation dial 82 (on the left in the figure), and locks the operation dial 82 so that it cannot rotate. And a holding mechanism 84 provided below the operation dial 82 to hold the lock member 83 in a depressed state.

  The operation dial 82 includes a dial main body 91 having a circular planar shape and a peripheral edge hanging down, and a rotary shaft 92 extending a predetermined length downward from the center of the dial main body 91, and has a longitudinal section of approximately T. It is formed in a letter shape. A large number of engagement teeth 91 a that can be engaged with engagement recesses 83 a described later of the lock member 83 are provided along the circumferential direction of the lower end portion of the peripheral edge portion of the dial body 91.

  On the other hand, the rotating shaft 92 is disposed so as to penetrate a support member 94 having a predetermined shape together with the sleeve 93 while being loosely inserted into a cylindrical sleeve 93 extending in the vertical direction. In addition, a tapered portion 92a that is tapered downward is provided at the lower end portion of the rotating shaft 92, and the latching that opens outward in the entire circumferential direction is just above the tapered portion 92a. A recess 92b is provided. The rotating shaft 92 has an engaging projection that protrudes outward at a position slightly above the center in the length direction and slidably engages with a long hole 93 a extending in the vertical direction of the sleeve 93. 92c is provided. The sleeve 93 is supported by the support member 94 so as to be immovable and rotatable in the vertical direction, and is fixed to the base in a state where the sleeve 93 penetrates the base. A coil spring 95 for biasing the operation dial 82 upward is provided between the dial body 91 and the support member 94 around the rotation shaft 92 and the sleeve 93.

  The operation dial 82 configured as described above is movable in the vertical direction with respect to the sleeve 93 by the length of the long hole 93a, and rotates as the operation dial 82 is rotated. The sleeve 93 rotates integrally with the shaft 92, and the rotation lever 30 also rotates accordingly. Note that the rotation shaft 92 of the operation dial 82 only needs to be configured to be movable in the vertical direction with respect to the sleeve 93 and to be able to rotate integrally. While forming in a rectangular shape, a star shape, etc., the cross section of the sleeve 93 may have a shape complementary to that of the rotating shaft 92. In this case, the engaging projection 92c of the rotation shaft 92 and the long hole 93a of the sleeve 93 can be omitted.

  The lock member 83 is fitted in the time signature and has a shape that wraps downward from the side of the dial body 91. The lock member 83 is formed with an engagement recess 83a having a predetermined depth that faces the engagement teeth 91a of the dial body 91 from below and opens upward at the lower end portion on the dial body 91 side.

  The holding mechanism 84 is disposed below the rotation shaft 92 of the operation dial 82, and has a pair of locking claws 84a and 84a that can rotate around a horizontal support shaft (not shown) at the lower end. is doing. Both the locking claws 84a, 84a are locked so that the vicinity of the support shaft is pressed from above by the tapered portion 92a of the rotating shaft 92 so as to be fitted into the locking recess 92b of the rotating shaft 92 from both sides. Thus, the operation dial 82 is configured to be prevented from moving upward. In addition, the locking claws 84a and 84a are further pressed from the above state to release the engagement with the locking recess 92b, thereby allowing the operation dial 82 to move upward. It is configured.

  In the touch weight adjusting device 4 including the lock mechanism 81 configured as described above, the operation dial 82 is turned to set the touch weight of the keyboard 2 to a desired touch, like the operation dial 13 of the first embodiment described above. Can be set to weight. After this setting, when the operation dial 82 is pressed from above against the urging force of the coil spring 95, one of the engagement teeth 91a of the dial body 91 is locked to the lock member 83 as shown in FIG. The engaging claw 84 a and 84 a of the holding mechanism 84 engage the engaging recess 92 b at the lower end of the rotating shaft 92. In this state, the engagement tooth 91a of the dial body 91 is held in a state of being engaged with the engagement recess 83a of the lock member 83, so that the operation dial 82 is locked so as not to rotate.

  On the other hand, when unlocking the operation dial 82, the operation dial 82 is once pressed from above. As a result, the locking shaft 92 is unlocked by both the locking claws 84a, 84a of the holding mechanism 84, and the operation dial 82 is pushed up by the coil spring 95, whereby the engagement teeth 91a of the dial body 91 are locked. 83 is disengaged from the engaging recess 83a. In this way, the operation dial 82 unlocked can be rotated, and the touch weight can be adjusted.

  As described above, according to the touch weight adjusting device 4 provided with the lock mechanism 81, by operating the operation dial 82 and setting the operation dial 82 to the locked state with the desired touch weight set, The touch weight of the keyboard 2 can be maintained at the set desired touch weight. Further, the operation dial 82 does not move due to the vibration of the piano 1 accompanying the performance, and the touch weight can be stably maintained during the performance.

  FIG. 11 shows the lock mechanism 101 applied to the operation lever 62 of the slide operation type. As shown in FIGS. 9A and 9B, the lock mechanism 101 includes a lock lever 102 provided on the right side of the operation lever 62 slidable in the front-rear direction (vertical direction in FIG. 10A). In addition to guiding the operating lever 62, a lever guide 103 for locking the operating lever 62 so that it cannot slide when the lock lever 102 is engaged is provided.

  As shown in FIG. 11B, the lock lever 102 has a predetermined shape that extends in the vertical direction along the lever body 62 a of the operation lever 62. Specifically, the lock lever 102 is disposed such that the upper end portion and the lower end portion thereof are spaced apart from the lever main body 62a by a predetermined distance, and the central portion is close to the lever main body 62a, and extends in the front-rear direction at the central portion. The lever body 62a is attached so as to be rotatable about the support shaft 104. Further, the lower end portion of the lock lever 102 is formed so as to go around from the upper side of the lever guide 103 to the right, and has an engagement tooth 102 a that can be engaged with an engagement recess 103 a described later of the lever guide 103. Yes. A spring 105 is provided between the upper end of the lock lever 102 and the lever main body 62a to urge the lock lever 102 so as to rotate clockwise in FIG. 11B.

  The lever guide 103 is formed in a rectangular shape whose planar shape extends in the front-rear direction, and has a guide hole 103 a extending in the front-rear direction for guiding the operation lever 62. In addition, a large number of engaging recesses 103 b that can engage with the engaging teeth 102 a of the lock lever 102 are provided along the length direction of the right edge portion of the lever guide 103. Then, when the engagement teeth 102a at the lower end of the lock lever 102 mesh with any of the engagement recesses 103b of the lever guide 103, the operation lever 62 is locked so as not to slide.

  In the touch weight adjusting device 61 having the lock mechanism 101 configured as described above, when adjusting the touch weight, the knob 62b of the operation lever 62 is pinched and the upper end of the lock lever 102 is moved to the spring 105. This is pressed against the operating lever 62 against the urging force. As a result, as shown in FIG. 11C, the lock lever 102 is slightly rotated with respect to the operation lever 62 so that the upper end approaches and the lower end separates. Is disengaged from the engagement recess 103b, and the lock of the operation lever 62 is thereby released. The touch weight of the keyboard 2 can be set to a desired touch weight by sliding the operation lever 62 in the front-rear direction while keeping the lock lever 102 pressed. After the setting, when the hand is released from the operation lever 62 (including the lock lever 102), the lock lever 102 is restored to the original state by the restoring force of the spring 105, and the engaging tooth 102a at the lower end thereof is moved to the lever. The operation lever 62 is locked by meshing with the engaging recess 103 b of the guide 103.

  As described above, according to the touch weight adjusting device 61 provided with the lock mechanism 101, the touch weight of the keyboard 2 is set to a desired touch as in the touch weight adjusting device 4 provided with the lock mechanism 81. The weight can be maintained stably. Further, after the operation lever 62 is operated and set to a desired touch weight, the operation lever 62 can be easily locked only by releasing the hand from the operation lever 62. Note that the operation lever 72 of the third embodiment can also be locked by a lock mechanism configured substantially the same as the lock mechanism 101.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. In the embodiment, the touch weight adjusting devices 4, 61 and 71 applied to the upright piano are exemplified. However, the present invention is not limited to this, and an acoustic piano such as a grand piano as well as an acoustic piano is exemplified. It is also possible to apply to a keyboard similar to the above, that is, an electronic piano provided with a keyboard in which each key is rotatably supported near the center in the length direction.

  Further, in the embodiment, the weight support rail 22 of the slider 11 is configured to support the front end portion of the weight lever 12, but the weight lever 12 may be configured to support the rear end portion. is there. However, in this case, when the touch weight becomes maximum, the engaging convex portion 30a of the rotating lever 30 of the first embodiment, the slider-side engaging convex portion 66c of the rotating lever 66 of the second embodiment, The engagement convex portion 74b of the disk 74 of the third embodiment is located at a position facing the rotation shafts 29, 66a, 74a from the front in the front-rear direction, that is, directly in front of the rotation shafts 29, 66a, 74a. The operation dial 13, the operation levers 62 and 72, the rotation levers 30 and 66, the disk 74, and the like need to be appropriately changed. Further, the detailed configuration of the touch weight adjusting devices 4, 61, 71 shown in the embodiment is merely an example, and can be appropriately changed within the scope of the gist of the present invention.

1 Piano (keyboard instrument)
2 Keyboard 2a Key 4 Touch weight adjuster 6 Balance pin (fulcrum)
7 Weight mounting pin (mounting part)
11 Slider 12 Weight lever (weight)
13 Operation dial (operation member)
14 Slider drive mechanism 22 Weight support rail (weight support part)
26 Support shaft 29 Rotating shaft 30 Rotating lever (Rotating member)
30a Engagement convex part (engagement part)
41 Slider Drive Mechanism 51 Slider Drive Mechanism 61 Touch Weight Adjustment Device 62 Operation Lever (Operation Member)
63 Slider drive mechanism 66 Rotating lever (Rotating member)
66a Rotating shaft 66c Slider engagement convex part (engagement part)
71 Touch weight adjusting device 72 Operation lever (operation member)
73 Slider drive mechanism 74 Disc (rotating member)
74a Rotating shaft 74b Engaging convex part (engaging part)
81 Lock mechanism 82 Operation dial (operation member)
101 Lock mechanism

Claims (5)

Adjusting the touch weight of a keyboard instrument that adjusts the touch weight of the keyboard in a keyboard instrument that has a plurality of keys arranged in parallel in the left-right direction, each extending in the front-rear direction and supported rotatably at a fulcrum near the center A device,
A slider having a weight support portion extending in the left-right direction above the plurality of keys, and movable in the front-rear direction;
Provided for each of the keys, each extending in the front-rear direction and supported at the weight support portion so as to be rotatable about a support shaft extending in the left-right direction at one end, and at a predetermined position behind the fulcrum of the key A plurality of weights placed on a placement part provided at a position and respectively rotated in conjunction with the corresponding key;
An operation member configured to be movable and operated to adjust the touch weight of the keyboard;
The slider is provided between the operating member and the slider, and moves the slider in the front-rear direction in conjunction with the operation of the operating member, and the degree of change in the amount of movement of the slider relative to the amount of operation of the operating member is A slider driving mechanism configured to become smaller as the spindle of the key approaches the mounting portion of the key,
A touch weight adjusting device for a keyboard instrument, comprising: The slider drive mechanism is configured to be rotatable about a rotation shaft extending in a direction orthogonal to the moving direction of the slider in conjunction with the operation of the operation member, and from the rotation shaft to the radial direction. A rotating member that engages with the slider via an engaging portion at a predetermined distance away from the slider;
As the pivot member rotates, the slider moves through the engagement portion, so that when the support shaft of the weight is closest to the mounting portion of the key, the engagement portion 2. The keyboard instrument touch weight adjusting device according to claim 1, wherein the counter is opposed to the pivot shaft from the front or the rear in the front-rear direction.   3. The keyboard instrument touch weight adjusting device according to claim 1, wherein the operation member is configured to be rotatable about an axis extending in one of a vertical direction and a horizontal direction.   The touch weight adjusting device for a keyboard instrument according to claim 1, wherein the operation member is configured to be movable in the front-rear direction.   The touch weight adjusting device for a keyboard instrument according to any one of claims 1 to 4, further comprising a lock mechanism for locking the operation member at an arbitrary position moved by an operation.

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