JPH07219521A - Hammer support structure of electronic keyboard musical instrument - Google Patents

Abstract

PURPOSE:To provide the hammer support structure of the electronic keyboard musical instrument which can be shortened in assembly time, properly support a hammer without slanting it to the right or left, and improve a touch feeling. CONSTITUTION:This structure has a keyboard chassis which has plural guide holes 38 for guiding the bearing parts 21 of plural hammers formed in the upper end part of a front plate 33 and plural fitting holes 36 formed in the lower end part of a back plate 35, shaft parts 27 which are stored rotatably in the bearing parts 21, and fixed arm parts 28 which extend backward from the upper ends of the shaft parts 27 and are fitted in the fitting holes 26, and is equipped with plural fulcrum members 24 having a couple of right and left fixation grooves 31 which are formed at the fixed arm parts 28 and positioned right behind the back plate 35 by fitting the fixed arm parts 28 in the fitting holes 36, a fixation member 25 which has an array of projection parts 40 inserted into the fixation grooves 31, and a fixation means 42 which fixes the fixation member 25 to the keyboard chassis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hammer support structure provided in an electronic keyboard instrument such as an electronic piano.

[0002]

2. Description of the Related Art FIG. 4 shows a keyboard device for a conventional electronic piano. In this keyboard device, the keyboard chassis 53
The balance pin 52 is erected on the reed 54 which is fixed to
The keyboard 51 is supported by the keyboard chassis 53 in a seesaw-like manner by passing the central portion thereof through the balance pin 52. On the other hand, the hammer 55 is provided for each keyboard 51 and has a hammer weight 56 at the front portion thereof, and the hammer support structure 57 allows the rear end portion thereof to have the keyboard chassis 5.
3 is rotatably supported. The hammer 55 contacts the upper surface of the rear end portion of the keyboard 51, presses the rear portion of the keyboard 51 downward by the weight of the hammer weight 56, and when the key is pressed, the hammer 55 is flipped up by the keyboard 51 and hits the hammer cushion 58, As a result, a touch feeling similar to that of an acoustic piano can be obtained.

The hammer support structure 57 includes the hammers 55.
And a hammer flange 59 that rotatably supports the hammer flange 59 provided at the rear end of the keyboard chassis 53.
And a hammer rail 60 to which is attached.
As shown in FIG. 5, the hammer flange 59 has a shaft hole 62 that supports the shaft portion 61 of the hammer 55 in a rotatable and retaining state, and positioning protrusions 63 and 64 that project from the back surface and the bottom surface, respectively. Through hole 6 penetrating in the front-back direction
And 5 are formed. On the other hand, the hammer rail 60
It is a plate-like member that extends continuously in the arrangement direction of the keyboard 51, and includes a horizontal shelf plate 66 and a back plate 67 that rises from the rear end of the shelf plate 66, and the shelf plate 66 has a large number of positioning holes 68.
However, a large number of positioning holes 69 and mounting holes 70 are formed in the back plate 67 so as to correspond to the respective hammer flanges 59.

The hammer flange 59 is positioned by fitting the positioning protrusions 63 and 64 of the hammer flange 59 into the corresponding positioning holes 68 and 69 of the hammer rail 60, respectively. The hammer flange 59 is fixed to the hammer rail 60 by passing through the mounting screw 71 configured by and tightening the mounting hole 70 while tapping the mounting hole 70.

[0005]

However, in the above-described conventional hammer support structure, when the hammer flange 59 is attached to the hammer rail 60, the hammer flange 59 is attached.
Since the mounting work with the mounting screws 71 has to be carried out every time, the assembly takes a very long time.
Further, since the hammer flange 59 is fixed while the mounting screw 71 is being tapped, the screwing direction is apt to vary, so that the hammer flange 59 is attached so as to be tilted left and right, and adjacent hammers 55 come into contact with each other. May cause the problem of.

The present invention has been made to solve such a problem, and can shorten the assembling time, can properly support the hammer without tilting it left and right, and can improve the touch feeling. It is an object of the present invention to provide a hammer support structure for an electronic keyboard instrument that can be used.

[0007]

In order to achieve the above object, the present invention provides a hammer support structure for an electronic keyboard instrument that supports a plurality of hammers that rotate in conjunction with a plurality of keyboards extending in the front-rear direction. At the rear end portion of each hammer, a bearing portion and a pair of left and right retaining projections that extend rearward with an interval above the bearing portion are formed, and extend rearward from the front plate and the upper end of the front plate. A shelf plate and a back plate extending upward from the shelf plate are formed, and a plurality of guide holes for guiding the bearings of the plurality of hammers are formed at the upper end of the front plate, and at the lower end of the back plate. A keyboard chassis having a plurality of mounting holes formed therein, a shaft portion rotatably housed in the bearing portion of the hammer, and a rearward portion extending from the upper end of the shaft portion through the neck portion at a distance from the shaft portion to the mounting hole. Each has a fixed arm part to be fitted A plurality of fulcrum members having a pair of left and right fixing grooves, which are formed on both side surfaces of the fixed arm portion and which are located immediately after the back plate by fitting the fixed arm portion into the mounting hole, and a plurality of convex portions arranged in line with each other are provided. Each of the plurality of convex portions includes a fixing member that is inserted into a fixing groove of the fixing arm portion that is fitted into the mounting hole, and a fixing unit that fixes the fixing member to the keyboard chassis. There is.

In this case, it is preferable that the fixing means comprises a plurality of screws for fixing the fixing member to the keyboard chassis for each of the plurality of hammers.

In these cases, the shelf plate of the keyboard chassis is formed with positioning holes which are continuous with the upper ends of the plurality of guide holes and which engage and position the neck portion of the fulcrum member when the fixed arm portion is fitted into the mounting hole. Preferably.

Further, in these cases, it is preferable that a spring for pressing the bearing portion of the hammer against the shaft portion of the fulcrum member is further provided.

[0011]

According to the hammer support structure of the electronic keyboard instrument of the first aspect, the hammer is attached to and supported by the hammer support structure as follows. That is, the shaft portion of the fulcrum member is housed in the bearing portion of the hammer, then the fixed arm portion of the fulcrum member is passed through the mounting hole of the keyboard chassis, the bearing portion of the hammer is passed through the guide hole, and the shaft portion of the fulcrum member is also passed through. The fulcrum member is pushed into the keyboard chassis so that the shelf plate of the keyboard chassis is sandwiched between and the fixed arm portion. As a result, the fixing groove of the fulcrum member comes to be positioned immediately after the back plate of the keyboard chassis. After performing such an operation for each fulcrum member, each convex portion of the fixing member is inserted into the fixing groove so as to straddle between each two adjacent fixing grooves, and finally,
The fulcrum member is fixed to the keyboard chassis by fixing the fixing member to the keyboard chassis by the fixing means.

In this case, the shelf board of the keyboard chassis is sandwiched between the shaft portion of the fulcrum member and the fixed arm portion, and
Since the convex portion of the fixing member inserted into each fixing groove acts as a wedge of the fulcrum member, the fulcrum member can be firmly fixed to the keyboard chassis and a stable attachment state can be obtained. Moreover, since a plurality of fulcrum members are simultaneously fixed through one common fixing member, the number of man-hours for attaching the fulcrum members is reduced, so that the assembly time of the hammer support structure can be shortened. Further, since the shelf plate of the keyboard chassis is sandwiched between the shaft portion of the fulcrum member and the fixed arm portion, and the plural fulcrum members are indirectly fixed through the common fixing member, Variations in the mounting angle of the members are reduced, and the hammer can be properly supported without tilting to the left or right.

Further, since the bearing portion of the hammer rotatably accommodates the shaft portion of the fulcrum member and is passed through the guide hole, the hammer rotates around the shaft portion while being guided by the guide hole. Move. In this case, the hammer retaining protrusion is located on the shelf of the keyboard chassis, and the contact with the shelf acts to prevent the hammer from falling.
The hammer does not separate from the fulcrum member.

According to another aspect of the hammer support structure of the present invention, the fixing means is composed of a plurality of screws for fixing the fixing member to the keyboard chassis for each of the plurality of hammers. It is only necessary to perform the tightening for each of the plurality of fulcrum members, and therefore the man-hours for attaching the fulcrum member can be reliably reduced.

In the hammer support structure according to the third aspect of the invention, the shelf of the keyboard chassis is connected to the upper ends of the plurality of guide holes, and the neck of the fulcrum member is engaged and positioned when the fixed arm is fitted into the mounting hole. Since the positioning hole is formed, the fulcrum member can be easily and correctly positioned in the front-rear direction and the left-right direction with respect to the keyboard chassis simply by engaging the neck portion of the fulcrum member with the positioning hole. It is possible to further improve the mounting accuracy of the fulcrum member and reduce the variation in the mounting angle.

Further, according to the hammer support structure of the fourth aspect, since the spring for pressing the bearing portion of the hammer against the shaft portion of the fulcrum member is further provided, it is possible to surely prevent the hammer from coming off when dropped. it can. Further, since the pressing force of the spring acts to increase the frictional force between the hammer and the fulcrum member, since the frictional force is small, the hammer support of the conventional electronic keyboard musical instrument, which was uncomfortable with the acoustic instrument, was generated. The touch feeling can be improved as compared with the structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view showing a keyboard device of an electronic piano incorporating a hammer support structure according to an embodiment of the present invention in a released state. As shown in the figure, this keyboard device includes a keyboard chassis 2, a keyboard 3 swingably attached to the keyboard chassis 2, and a hammer 4 rotatably supported by a hammer support structure 1 according to the present invention. It has and.

The keyboard chassis 2 is composed of a horizontal chassis 5, a vertical chassis 6 attached to the rear end of the horizontal chassis 5, and a reed chassis 7 screwed to the front portion of the horizontal chassis 5. The vertical chassis 6 includes a hammer rail 8 and an action rib 9 which are sequentially screwed to the horizontal chassis 5.
And hammer angle 10.
In addition, a keyboard pillow 11 is attached to the upper surface of the rear portion of the horizontal chassis 5 in order to restrict downward rotation of the rear portion of the keyboard 3, and the reed chassis 7 detects the key pressing state of the keyboard 3. A keyboard switch 12 composed of a rubber switch is attached to the.

The keyboard 3 is composed of a wooden keyboard body 13 extending in the front-rear direction (left-right direction in FIG. 1) and a keyboard skin 14 made of a resin such as acrylic adhered to the upper surface of the front half of the keyboard body 13. A plate-shaped cushion 15 made of foamed polyurethane or the like is attached to the upper surface of the rear end portion of the keyboard body 13. The keyboard 3 is supported like a seesaw by passing a central portion thereof through a balance pin 17 standing upright from a reed center 16 fixed to the reed chassis 7.

The hammer 4 is provided on each keyboard 3, extends in the front-rear direction like an arm, has a hammer weight 18 at the front and a contact portion 19 at the rear, and
The rear end portion is rotatably supported by the hammer support structure 1. As shown in FIG. 2, a rear end portion of the hammer 4 is provided with a bearing portion 21 in which a shaft hole 20 is formed, and a pair of left and right retaining projections 2 are provided from above the front end of the bearing portion 21.
2, 22 project backwards. The shaft hole 20 has a substantially semicircular inner peripheral surface and is open upward.

The hammer support structure 1 includes a support shaft (fulcrum member) 24 for supporting the hammer 4, the hammer rail 8 to which the support shaft 24 is fixed, and a fixing fitting for fixing the support shaft 24 to the hammer rail 8. A (fixing member) 25 and a leaf spring 26 that presses the hammer 4 against the support shaft 24 are provided.

The support shaft 24 is made of plastic or the like, and as shown in FIG. 2, a shaft portion 27 having a substantially semicircular cross section, and a fixed arm portion 28 located above the shaft portion 27 and extending rearward. And a neck portion 29 connecting the shaft portion 27 and the fixed arm portion 28. The shaft portion 27 is housed in the shaft hole 20 of the hammer 4 and rotatably supports the hammer 4. A large number of grease reservoirs 30 are formed on the left and right side surfaces of the shaft portion 27, and a pair of left and right fixing grooves 31, 31 are formed on the side surface of the fixed arm portion 28.

The hammer rail 8 is made of metal such as steel, and includes a bottom plate 32, a front plate 33 that rises from the front end of the bottom plate 32, a shelf plate 34 that horizontally extends rearward from the upper end of the front plate 33, and a shelf. The back plate portion 35 stands up from the rear end of the plate 34, and as a whole extends in the direction in which the keyboards 3 are arranged (the left-right direction). The hammer rail 8 has a support shaft mounting hole (mounting hole) 36, a support shaft positioning hole (positioning hole) 37, and a hammer guide hole (guide hole) 38.
A plurality of sets of hole groups are formed corresponding to the hammer 4.

The support shaft mounting hole 36 is formed in the lower end of the back plate 35, and the support shaft 24 is mounted by fitting and penetrating the fixed arm portion 28 of the support shaft 24. In this mounted state, the fixing groove 31 of the support shaft 24 is fixed to the support shaft mounting hole 3
It is located immediately after 6. The support shaft positioning hole 37 is formed at the front end of the shelf plate 34, and the support shaft 24 has a neck portion 2
9 is inserted to position the support shaft 24. The hammer guide hole 38 is formed at the upper end of the front plate 33 so as to be continuous with the spindle positioning hole 37, and guides the rotation of the hammer 4 through the bearing portion 21 of the hammer 4 that accommodates the shaft portion 27 of the spindle 24.

The fixing member 25 is made of an elongated metal plate having an isosceles shape with an obtuse cross section. Fixing bracket 25
On one side, a plurality of notches 39 corresponding to the hammer 4 are formed along the length direction. Holes 41 are formed for each of the plurality of protrusions 40 (every three protrusions 40 in the embodiment) on the base end side (upper side) of the protrusions 40 formed between the adjacent notches 39, 39. ing. Then, the convex portion 40 is inserted into the fixing groove 31 of each support shaft 24 attached to the hammer rail 8, and the fixing metal fitting 25 is screwed to the back plate 35 by the fixing screw (screw) 42 passed through each hole 41. The support shaft 24 is fixed to the hammer rail 8.

The leaf spring 26 is made of metal, and has a linearly extending base portion 43 and a hammer 4 connected to the base portion 43.
And a plurality of arc-shaped spring portions 44 corresponding to. A cushion 45 such as felt is attached to the upper surface of each spring portion 44. The leaf spring 26 is fastened together with the action rib 9 with the screw 46 to the front plate 33 of the hammer rail 8 at the base portion 43.
4 through the cushion 45, the bearing portion 21 of the hammer 4
Is constantly pressed upward toward the shaft portion 27 of the support shaft 24.

Next, the hammer support structure 1 having the above-mentioned structure
The assembling procedure will be described in detail with reference to FIG.
First, as shown in FIG. 3A, the shaft hole 20 of the hammer 4 is
The support shaft 24 is attached to the hammer rail 8 with the shaft portion 27 of the support shaft 24 accommodated therein. That is, the fixed arm portion 28 of the support shaft 24 is connected to the support shaft mounting hole 36 of the hammer rail 8.
While inserting the bearing portion 21 of the hammer 4 into the hammer guide hole 38, the shelf plate 34 of the hammer rail 8 is sandwiched between the shaft portion 27 of the support shaft 24 and the fixed arm portion 28. Push into the hammer rail 8. As a result, the neck portion 29 of the support shaft 24 engages with the support shaft positioning hole 37 of the hammer rail 8 and the positioning thereof in the front-rear direction and the left-right direction is performed. In this state, hammer 4
The pair of retaining projections 22, 22 are located above the front part of the shelf plate 34, and the fixing groove 31 of the support shaft 24 is located immediately behind the back plate 33 of the hammer rail 8 (see the same figure ( See b)).

After performing the above-described work on each of the support shafts 24, the convex portion 40 of the fixing fitting 25 is attached to the two adjacent support shafts 2.
Each fixing groove 3 so as to straddle between the fixing grooves 31 of 31
1, then insert the fixing screw 42 into each hole 41,
By fixing the fixing bracket 25 to the back plate 35 with screws,
The support shaft 24 is fixed to the hammer rail 8 (see FIG. 7C). In this state, the support shaft 24 sandwiches the shelf plate 34 between the shaft portion 27 and the fixed arm portion 28, and the protrusions 40 of the fixing metal fittings 25 inserted into the respective fixing grooves 31 cause the wedges of the respective support shafts 24 to protrude. As a result, the support shaft 24 can be firmly fixed to the hammer rail 8 and a stable mounting state can be obtained.

Further, since a plurality of support shafts 24 are simultaneously fixed through one common fixing metal fitting 25, the number of man-hours for mounting the support shafts 24 is reduced, so that the assembly time of the hammer support structure 1 is shortened. be able to. Further, each support shaft 24 is mounted so as to sandwich the shelf plate 34 and positioned by the support shaft positioning hole 37.
Since the plurality of support shafts 24 are indirectly fixed via the common fixing metal fitting 25, the variation in the mounting angle of the support shafts 24 is reduced, and the hammer 4 is properly supported without being tilted left and right. be able to.

Finally, the leaf spring 26 is attached to the hammer rail 8
The front plate 33 is attached to the hammer rail 8 by tightening together with the action rib 9 with the screw 46 (see (d) of the same figure). In this state, each spring portion 44 of the leaf spring 26 constantly presses the corresponding bearing portion 21 of the hammer 4 upwards against the shaft portion 27 of the support shaft 24 via the cushion 45.

Next, the supporting operation of the hammer supporting structure 1 will be described in detail. First, in the above-mentioned state in which the hammer 4 is attached, the hammer 4 tries to drop, but the retaining projection 22 located above the front part of the shelf plate 34 prevents the hammer 4 from falling due to contact with the shelf plate 34. Since it blocks, the hammer 4 does not come off from the support shaft 24.

When the keyboard 3 shown in FIG. 1 is released, a moment about the base end of the bearing portion 21 acts on the hammer 4 due to the weight of the hammer weight 18, so that the bearing portion 21 is supported by the spindle. Since it is pressed against the shaft 27 of 24,
No gap is created between the bearing portion 21 and the shaft portion 27.
On the other hand, even when a key is pressed, the pushing force of the keyboard 3 causes
Since the bearing portion 21 is pressed against the shaft portion 27 and no gap is formed between the two, the hammer 4 can be smoothly rotated. Further, when the hammer 4 descends, the pressing force of the leaf spring 26 prevents the bearing portion 21 from being detached from the shaft portion 27, and at the same time, a strong force such as an impact force to detach the bearing portion 21 is temporarily applied to the hammer 4. If it works,
The retaining projections 22 prevent the hammer 4 from coming off.

The leaf spring 26 not only plays the role of preventing the hammer from coming off as described above, but also serves to improve the touch feeling. That is, the pressing force of the leaf spring 26 that presses the hammer 4 against the support shaft 24 appears as a touch feeling as the magnitude of the frictional force. In the conventional electronic piano, since this frictional force is smaller than that of the acoustic piano, the return load is insufficient and a feeling of strangeness is generated. Therefore, as in the present embodiment, the leaf spring 26 applies the frictional force. As a result, a touch feeling close to that of an acoustic piano can be obtained.

As described above, in the hammer support structure 1 of the present embodiment, the plurality of support shafts 24 supporting the hammer 4 are
Since they are fixed at the same time via the one common fixing metal fitting 25, the number of man-hours for attaching the support shaft 24 is reduced, so that the assembly time of the hammer support structure 1 can be shortened. Further, each of the support shafts 24 is mounted so as to sandwich the shelf plate 34 and positioned by the support shaft positioning holes 37, and the plurality of support shafts 24 are indirectly connected via the common fixing metal fitting 25. Since it is fixed, support shaft 2
The variation in the mounting angle of the hammer 4 is reduced, and the hammer 4 can be properly supported without tilting to the left or right.
Further, the retaining projection 22 of the hammer 4 and the leaf spring 26
Thus, the hammer 4 can be reliably prevented from coming off, and the leaf spring 26 can add a frictional force to the hammer 4 to improve the touch feeling.

[0035]

As described above, the hammer support structure for an electronic keyboard instrument according to the present invention can shorten the assembling time, can properly support the hammer without tilting it to the left and right, and can improve the touch feeling. It has the effect of being able to do so.

[Brief description of drawings]

FIG. 1 is a side view showing a keyboard device of an electronic piano incorporating a hammer support structure according to an embodiment of the present invention in a released state.

FIG. 2 is an exploded partial perspective view of the hammer support structure of FIG.

FIG. 3 is a side view showing an assembling procedure of the hammer support structure of FIG.

FIG. 4 is a side view similar to FIG. 1, showing a keyboard device of a conventional electronic piano.

FIG. 5 is an exploded partial perspective view of a conventional hammer support structure for an electronic piano.

[Explanation of symbols]

 1 Hammer support structure 2 Keyboard chassis 3 Keyboard 4 Hammer 8 Hammer rail 21 Bearing part 22 Detachment projection 24 Support shaft 25 Fixing metal fitting 26 Leaf spring 27 Shaft part 28 Fixing arm part 29 Neck part 31 Fixing groove 33 Front plate 34 Shelf plate 35 Back Plate 36 Support shaft mounting hole 37 Support shaft positioning hole 38 Hammer guide hole 42 Fixing screw

Claims (4)

[Claims] 1. A hammer support structure for an electronic keyboard instrument that supports a plurality of hammers that rotate in conjunction with a plurality of keyboards extending in the front-rear direction, each bearing comprising a bearing portion at a rear end portion of each hammer. A pair of left and right retaining projections are formed on the bearing portion and extend rearward with a space therebetween, and a front plate, a shelf plate extending rearward from an upper end of the front plate, and a back plate extending upward from the shelf plate. And a plurality of guide holes that respectively guide the bearing portions of the plurality of hammers are formed in the upper end portion of the front plate, and a plurality of mounting holes are formed in the lower end portion of the back plate. A keyboard chassis, a shaft portion that is rotatably accommodated in the bearing portion of the hammer, and a rear portion that extends rearward from the upper end of the shaft portion via a neck portion at a distance from the shaft portion and is fitted in the mounting hole. Each has a fixed arm part , A plurality of fulcrum members having a pair of left and right fixing grooves, which are formed on both side surfaces of the fixed arm portion and are located immediately after the back plate by fitting the fixed arm portion into the mounting hole, and are arranged in a line with each other. A fixing member having a plurality of convex portions, each of the plurality of convex portions being inserted into the fixing groove of the fixing arm portion fitted in the mounting hole, and fixing the fixing member to the keyboard chassis. A hammer support structure for an electronic keyboard instrument, comprising: a fixing means. 2. The electronic keyboard according to claim 1, wherein the fixing means includes a plurality of screws for fixing the fixing member to the keyboard chassis for each of the plurality of hammers. Instrument hammer support structure. 3. The shelf of the keyboard chassis is connected to the upper ends of the plurality of guide holes, and the neck portion of the fulcrum member is engaged and positioned when the fixed arm portion is fitted into the mounting hole. The hammer support structure for an electronic keyboard musical instrument according to claim 1 or 2, wherein a positioning hole is formed. 4. The hammer for an electronic keyboard instrument according to claim 1, further comprising a spring that presses the bearing portion of the hammer against the shaft portion of the fulcrum member. Support structure.