JP2013076816A - Attachment structure of let-off feeling giving member of electronic keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a let-off giving member of an electronic keyboard musical instrument, which allows accurate positioning of a let-off giving member relative to a hammer and is capable of giving a uniform stable let-off feeling in response to depression of any key.SOLUTION: There is provided the attachment structure of a let-off giving member 6 with which a hammer 5 turning in linkage with a depressed key is temporarily engaged during turning to give a let-off feeling to a touch feeling of the depressed key, in a keyboard device of an electronic keyboard musical instrument having a let-off function to give a let-off feeling approximating that of an acoustic piano. The attachment structure includes a hammer support 4 freely turnably supporting the hammer 5, and the let-off giving member 6 is directly attached to the hammer support 4.

Description

  The present invention is applied to an electronic keyboard instrument such as an electronic piano, and relates to a mounting structure of a let-off imparting member for imparting a let-off feeling similar to an acoustic piano.

  2. Description of the Related Art Conventionally, as a keyboard device for an electronic keyboard instrument having a let-off function for imparting a let-off feeling in an electronic piano or the like, for example, one disclosed in Patent Document 1 already filed by the present applicant is known. In this keyboard device, a hammer that rotates in conjunction with a depressed key is rotatably supported by an action chassis made of a metal extruded product. Further, the keyboard device is provided with a let-off component for each hammer, and the engagement protrusion of the hammer that rotates with the key depression temporarily engages the let-off component during the rotation, A let-off feeling is given to the touch feeling of the pressed key.

  The let-off component has an attachment portion and a main body portion that extends forwardly downward from the attachment portion. The let-off component configured as described above is attached to the upper part of the action chassis via the holder so that the attachment portion is attached to the holder and the main body portion faces the corresponding hammer. More specifically, a large number of let-off components corresponding to a large number of hammers are attached to a holder extending in the left-right direction, and the holder is screwed to the action chassis, thereby being aligned in the left-right direction. Attach to the action chassis.

JP 2010-262129 A

  In the above keyboard device, the let-off feeling is imparted by engaging and disengaging the engagement protrusion of the hammer with the tip of the let-off component. For this reason, high accuracy is required for the positional relationship between the hammer and the let-off component, the overall posture of the let-off component, and the position of the tip. However, as described above, in the conventional keyboard device, the let-off component is attached to the action chassis through a holder screwed to the action chassis, so that the let-off component is against the hammer directly attached to the action chassis. May not be accurately positioned. In addition, when the posture and the position of the tip portion vary between the let-off components, there is a possibility that a uniform and stable let-off feeling cannot be given to all the keys when the keys are pressed. Therefore, the above keyboard device has room for improvement with regard to the mounting structure of the let-off component.

  The present invention has been made in order to solve the above-described problems, and can position the let-off imparting member with respect to the hammer with high accuracy, and a uniform and stable let-off sensation when all keys are depressed. It is an object of the present invention to provide a structure for attaching a let-off providing member for an electronic keyboard instrument.

  In order to achieve the above object, the invention according to claim 1 is a keyboard device of an electronic keyboard instrument having a letoff function that gives a letoff feeling similar to that of an acoustic piano. The mounting mechanism of the let-off imparting member that imparts a let-off feeling to the touch feeling of the key that has been pressed by temporarily engaging the let-off imparting member during the rotation of the hammer. It has a hammer support that is movably supported, and the let-off imparting member is directly attached to the hammer support.

  According to this configuration, since the let-off imparting member is directly attached to the hammer support that rotatably supports the hammer, the let-off member is attached to the action chassis that supports the hammer via the holder. It can be positioned with high accuracy with respect to the hammer. Thereby, a stable let-off feeling can be given to the key corresponding to the hammer when the key is pressed.

  The invention according to claim 2 is the attachment structure of the let-off imparting member of the electronic keyboard instrument according to claim 1, wherein the let-off imparting member is composed of a plurality of let-off imparting members, and each of the plurality of let-off imparting members is A mounting portion and a body portion extending forward and downward from the lower end of the mounting portion toward the corresponding hammer, and the hammer support has a plurality of hammers respectively corresponding to a plurality of keys in the left-right direction. A hammer support part that rotatably supports in a state of being aligned with each other, and a plurality of let-off imparting members that are attached to the mounting part that are formed in a state that corresponds to each of the plurality of hammers and that are aligned in the left-right direction. A plurality of mounting holes, and are provided in the vicinity of the plurality of mounting holes so as to protrude downward, than the mounting holes of each of the plurality of let-off imparting members. Wherein the front end opposite the portion of the extending direction of the position a and the main body portion has an abutting contact wall, the.

  According to this configuration, each of the plurality of let-off imparting members has an attachment portion and a main body portion that extends downward from the lower end toward the corresponding hammer. On the other hand, the hammer support supports a plurality of hammers respectively corresponding to a plurality of keys by a hammer support part so as to be rotatable in a horizontal direction, and also supports a plurality of hammers in a horizontal direction. It has a plurality of mounting holes formed side by side. A plurality of let-off imparting members are respectively attached to the plurality of attachment holes in a state where the attachment portion penetrates. Further, a contact wall projecting downward is provided in the vicinity of the plurality of mounting holes, and predetermined portions of each of the plurality of let-off imparting members are in contact with the contact wall. Specifically, the predetermined part is a part of the let-off imparting member attached to the attachment hole, which is lower than the attachment hole and opposite to the tip in the extending direction of the main body part.

  As described above, in the plurality of let-off imparting members respectively attached to the hammer support via the plurality of attachment holes, the positions of the respective let-off imparting members in the vertical direction and the front-rear direction are determined by the attachment holes, and the main body portion extends in the front downward direction. The posture is determined by the contact wall. Accordingly, by appropriately setting the positions and sizes of the mounting holes and the contact walls of the hammer support, the positions and postures of the plurality of let-off imparting members are evenly aligned in the left-right direction without variation among them. be able to. As a result, a uniform and stable let-off feeling can be imparted to all keys when the keys are pressed.

It is a side view which shows the keyboard apparatus of the electronic piano to which the attachment structure of the let-off provision member by one Embodiment of this invention is applied, with a part notched. It is a perspective view which shows a hammer support, (a) shows the whole hammer support for 1 octave, (b) shows the state which notched one part. It is a figure which shows a hammer support, (a) is a top view, (b) is a front view. It is a figure which shows a let-off component, (a) is a perspective view which shows the state with which several let-off components were continued, (b) is a side view of a let-off component. (A) is side sectional drawing which shows the state which attached the hammer, the key switch, and the let-off component to the hammer support, (b) is a figure which expands and shows the inside of the dashed-dotted line circle C of (a). .

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a keyboard apparatus for an electronic piano to which a mounting structure for a let-off imparting member according to an embodiment of the present invention is applied, in a key released 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), and a number of let-off components 6 (let-off giving members) provided for each hammer 5 to give a let-off feeling when the key 2 is depressed (only one). And a key switch 7 for detecting key press information of the key 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 behind the center of the key body 15, 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 fulcrum shaft portion 21 for supporting each hammer 5 is formed at the upper end portion 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, 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 portion of the hammer body 22, and the hammer 5 is rotatable to the hammer support 4 by engaging the shaft hole 24 with the fulcrum shaft portion 21. It is supported.

  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 obliquely extends rearward 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 portion inserted into the switch mounting portion 20 and a front end portion and a central portion screwed to the switch mounting portion 20. In addition, the switch body 30 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 fulcrum shaft 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 attachment structure of the let-off imparting member according to the present invention will be described in detail. 2 and 3 show the hammer support 4 for one octave. As described above, the hammer support 4 is formed of a synthetic resin molded product, and has a plurality of partition walls 51 that partition adjacent hammers 5 with a predetermined interval in the left-right direction. . Each partition wall 51 corresponds to the hammer support portion 19 and has a side wall shape that is formed in a substantially rectangular shape with a vertically long side surface. The partition wall 51 corresponds to the switch mounting portion 20 and is connected to the upper front end of the square wall 52. A side wall is formed of a triangular wall 53 having a substantially triangular shape. In this hammer support 4, all the rectangular walls 52 have lower front end portions and lower end portions continuous in the left-right direction, and upper rear end portions continue in the left-right direction via the back wall portion 54. Yes. On the other hand, the upper half of the upper half of each triangular wall 53 is connected in the left-right direction via the upper wall 55.

  A plurality of board locking portions 54 a projecting obliquely upward and forward are appropriately provided near the upper end of the square wall 52 at the upper front end portion of the back wall portion 54. The board is locked in a state where the rear end of the switch board 29 of the key switch 7 is inserted between the board locking parts 54 a and the respective square walls 52.

  The upper wall portion 55 is provided with a plurality of (two in this embodiment) screwing portions 56 having a screw hole 56a and protruding upward by a predetermined length at the upper surface front end portion, while the upper surface rear end portion. In addition, a plurality of (three in this embodiment) substrate support portions 57 projecting upward by a predetermined length are provided. Each substrate support portion 57 is composed of a pair of protrusions slightly spaced in the left-right direction, and a screw hole 57a is formed between both protrusions. The upper wall 55 is formed with a plurality of mounting holes 58 for mounting the let-off component 6 between the adjacent partition walls 51 and 51 (triangular walls 53 and 53).

  These mounting holes 58 correspond to the plurality of hammers 5 supported by the hammer support 4 and are formed in a state of being arranged in the left-right direction. Each mounting hole 58 is formed in a square having a predetermined planar shape, and these mounting holes 58 have a common position other than the position in the left-right direction, that is, the position in the vertical direction and the front-rear direction. Further, on the lower surface of the upper wall portion 55, the contact wall 60 extends in the left-right direction, slightly protrudes downward from the front side edge portion of the mounting hole 58, and comes into contact with a later-described rear locking convex portion 47 of the let-off component 6. Is formed. Note that the opening 59 formed at the rear of each mounting hole 58 of the upper wall portion 55 has an engagement protrusion 27 of the hammer 5 that engages with the let-off component 6 when the hammer 5 rotates upward. This is to avoid hitting the portion 55.

  Further, between the adjacent partition walls 51, 51, the fulcrum shaft portion 21 extending in the left-right direction is provided at a portion where the square wall 52 and the triangular wall 53 are connected. As described above, the hammer 5 is rotatably supported on the fulcrum shaft portion 21.

  FIG. 4 (a) shows a part (only three are shown) of a set product 6A in which a plurality of let-off parts 6 are connected and integrally formed with one octave (12 pieces) as one set. b) is a side view of the let-off component 6. As shown in the figure, the let-off component 6 includes an attachment portion 41 for attaching itself to the upper wall portion 55 of the hammer support 4, a main body portion 42 extending downward from the lower end of the attachment portion 41, and the main body portion. The head portion 28 is provided at the front end of the head portion 42 via the constricted portion 43.

  The attachment portion 41 is formed in a block shape having a hollow portion 44 that opens upward, and adjacent let-off components 6 and 6 are connected in the left-right direction via a connecting portion 45 at the upper end portion. In addition, a front locking projection 46 and a rear locking projection 47 are provided at the lower end of the mounting portion 41 on the front side on which the main body portion 42 extends and on the rear side on the opposite side, respectively. In addition, lateral locking projections 48 are provided on both the left and right sides in the direction in which the let-off components 6 are continuous. And in the attachment part 41, the cross section between the connection part 45 of an upper end part, and the latching convex parts 46, 47, 48, 48 of the front and rear, right and left of the lower end part is the shape of the attachment hole 58 on the hammer support 4 side, The size is almost the same.

  The main body 42 extends a predetermined length from the lower end of the mounting portion 41 to the front downward, and is formed so that the cross section is slightly smaller toward the tip. Further, the head portion 28 is formed so that the tip side is curved convexly.

  The set product 6 </ b> A having the plurality of let-off components 6 configured in this manner is attached to the upper wall portion 55 of the hammer support 4. Specifically, as shown in FIG. 5, each let-off component 6 is attached to the upper wall portion 55 via the attachment hole 58, and in this case, the attachment portion 41 is an attachment hole of the upper wall portion 55. 58, the connecting portion 45 is locked to the upper edge of the mounting hole 58, while the front locking convex portion 46, the rear locking convex portion 47, and the left and right lateral locking convex portions 48, 48 are attached. Locked to the lower edge of hole 58.

  Further, in this case, the rear locking projection 47 contacts the contact wall 60 of the upper wall portion 55. More specifically, the rear locking projection 47 is in contact with the surface of the contact wall 60 on the let-off component 6 side in a slightly crushed state. The above-described rear locking convex portion 47 corresponds to “a portion lower than the attachment holes of each of the plurality of let-off imparting members and on the opposite side to the front end in the extending direction of the main body”.

  As described above, in the set product 6A attached to the upper wall part 55 through the plurality of attachment holes 58 by the rear locking convex part 47 coming into contact with the contact wall 60, between the let-off parts 6, The inclined posture of the main body 42 is the same, and the position of the head 28 is also the same.

  As described above in detail, according to the present embodiment, since the let-off component 6 is directly attached to the hammer support 4 that rotatably supports the hammer 5, unlike the conventional case that is attached via a holder, The let-off component 6 with respect to the hammer 5 can be positioned with high accuracy. In addition, the let-off component 6 of the set product 6A has an attachment portion 41 attached to the attachment hole 58 having a common vertical and front-back position, and in addition, abutment via the rear locking projection 47. It is in contact with the wall 60. Accordingly, all the let-off components 6 of the set product 6A can be evenly aligned in the left-right direction without any variation between them. Thereby, a uniform and stable let-off feeling can be given to all the keys 2 when the keys are pressed.

  Note that the detailed configurations of the hammer support 4 and the let-off component 6 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Keyboard apparatus 2 Key 4 Hammer support 5 Hammer 6 Let-off component (let-off provision member)
6A Set product 19 Hammer support part 27 Engagement protrusion 28 Head part 41 Attachment part 42 Body part 47 Rear locking convex part 55 Upper wall part 58 Attachment hole 60 Contact wall

Claims (2)

In a keyboard device of an electronic keyboard instrument having a let-off function that gives a feeling of let-off similar to an acoustic piano, a hammer that rotates in conjunction with a pressed key is temporarily applied to the let-off providing member during the rotation. An attachment structure of a let-off imparting member that provides a let-off feeling to the touch feeling of the depressed key by engaging,
A hammer support that rotatably supports the hammer,
An attachment structure for a let-off imparting member of an electronic keyboard instrument, wherein the let-off imparting member is directly attached to the hammer support. The let-off imparting member is composed of a plurality of let-off imparting members,
Each of the plurality of let-off imparting members has an attachment portion and a main body portion extending from the lower end of the attachment portion toward the corresponding hammer toward the front,
The hammer support is
A hammer support portion that rotatably supports a plurality of hammers respectively corresponding to a plurality of keys in a state of being arranged in the left-right direction;
A plurality of mounting holes to which the plurality of let-off imparting members are respectively attached in a state where the plurality of hammers correspond to each other and are formed in a state aligned in the left-right direction, and the mounting portion penetrates,
Protrusions are provided in the vicinity of the plurality of mounting holes so as to project downward, and a portion of each of the plurality of let-off imparting members that is lower than the mounting holes and opposite to the distal end in the extending direction of the main body portion is provided. An abutting wall that abuts,
The attachment structure of the let-off imparting member of the electronic keyboard instrument according to claim 1, wherein

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