JP2017198721A - Backstop device for upright pianos - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backstop device for upright pianos that can improve repeated key striking performance while securing stable backstop performance.SOLUTION: A backstop device 1 for upright pianos that stops the return rotation of a hammer 5 after hitting a string is equipped with a catcher 33 disposed on the hammer 5 and a back check 18 that is disposed on an action 4 and stops the hammer 5 by engaging the catcher 33 in a state in which the catcher 33 is in contact with the hammer 5. The back check 18 has a pushing-up unit 18b that, when engaging the catcher 33, comes into contact with the lower part of the catcher 33 from underneath, and so pushes up the catcher 33 as to permit the action 4 to press up the hammer 5 when moving away from the catcher 33 after the hammer 5 stops and before completion of its return rotation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an upright piano backs that stops a hammer that returns and rotates after striking, in a upright piano that strikes a string when the hammer is pushed up by an action and rotates as the key is depressed. The top device.

  Conventionally, as a backstop device for this type of upright piano, a device disclosed in Patent Document 1 already filed by the present applicant is known. This backstop device includes a catcher provided at the tip of a catcher shank protruding forward from the bat of a hammer, and a backcheck provided at the upper end of a backcheck wire erected at the front end of the wippen. I have. The catcher front part is provided with a locked part extending in the vertical direction, and the front surface thereof is formed in a convex shape, while the back part of the back check is provided with a locking part extending in the vertical direction, and the rear surface. Is formed in a concave shape. The catcher and the back check face each other at an interval in the front-rear direction in the key release state.

  When the key is pressed, the whippen rotates in conjunction with it, and the bat of the hammer is pushed up by the jack rotatably supported by the whippen, so that the hammer rotates and strikes the string. String. After this stringing, the hammer temporarily stops when the catcher comes into contact with the back check and is locked during the return rotation to the original position in the key released state (hereinafter referred to as “back stop”). Thereby, rebound of a hammer is prevented. When the key release is started after the backstop, the whippen starts to rotate to the original position in the key-released state, and the back check attached to the whippen leaves the catcher. As a result, the stopped hammer resumes the return rotation and comes into contact with the hammer rail to complete the return rotation. Further, in this case, when the key is completely released, the whippen that has been rotated also returns and rotates to the original position in the key released state. Then, the jack supported by the whippen enters the lower side of the bat of the hammer, and the jack can be pushed up again.

JP 2006-301356 A

  In the above-described conventional backstop device, when the catcher comes into contact with the backcheck, a large contact area is secured by the concave and convex surfaces of both the locked portion and the locking portion, so that the planes are in surface contact with each other Compared to, a large frictional force can be secured between the catcher and the back check, and a stable back stop can be obtained. However, when the jack enters the lower side of the bat of the hammer, the timing at which the jack can be pushed up again by the jack is after the hammer and the wicken are turned back to the original positions in the released state. For this reason, an upright piano equipped with a conventional backstop device cannot be struck by pressing the key unless the key is completely released. In particular, when hitting the key repeatedly, if the key is pressed again before the key that has been pressed returns to the released state, the jack will be delayed from entering the underside of the hammer bat, resulting in the string being hit by the hammer. It may cause so-called missing sound that cannot be properly struck. Therefore, there is room for improvement in the conventional backstop device.

  The present invention has been made to solve the above-described problems, and provides a backstop device for an upright piano that can improve the repeatability of keys while ensuring a stable backstop. With the goal.

  In order to achieve the above object, according to the first aspect of the present invention, in the upright piano in which the hammer is pushed up by an action and turns the string by turning as the key is depressed, An upright piano backstop device that stops the hammer that returns and rotates, and is provided in the action with the catcher provided on the hammer, and the catcher is in contact with the catcher during the return rotation of the hammer. A back check that stops the hammer by locking, and the back check contacts the lower part of the catcher from below when locking the catcher, and after the hammer stops and before the return rotation is completed. When pushing away from the catcher, press the catcher to allow the action to push the hammer up It characterized in that it has a gel push-up portion.

  According to this configuration, in the upright piano, as the key is pressed, the hammer is pushed up by the action and turns the string by rotating. After the string is struck, the return-turning hammer stops in the middle of return-turning by being caught by the catcher in contact with the back-check, and in this case, the back-check push-up part Comes into contact with the lower part of the catcher from below. Thereby, the hammer is backstopped and rebound after stringing is prevented.

  When the release of the pressed key is started after the back stop, the back check is released from the catcher, and the return rotation of the hammer is resumed accordingly. In this case, when the back check leaves the catcher, the catcher is pushed up by the push-up portion of the back check, thereby allowing the hammer to be pushed up by the action. In this way, the hammer can be pushed up by action after the backstop and before the hammer's return rotation is completed.Unlike conventional upright pianos, the key pressed before the key returns to the released state. When the key is pressed again, the string can be appropriately hit with a hammer. Therefore, according to the present invention, it is possible to improve the repeatability of keys in an upright piano.

  According to a second aspect of the present invention, in the backstop device for the upright piano according to the first aspect, the catcher is attached to a bat rotatably supported by a hammer via a catcher shank extending in the front-rear direction. The back check is attached to a whippen that is rotatably supported by the action via a back check wire extending in the vertical direction, and the push-up portion is formed to protrude obliquely upward toward the catcher, It is located near the lower end of the catcher in the key-released state, and is configured to be in sliding contact with the lower surface of the catcher when the back check locks the catcher.

  According to this configuration, like a general upright piano, the catcher is attached to the hammer bat via the catcher shank, while the back check is attached to the action whippen via the back check wire. The back check push-up part is formed so as to protrude obliquely upward toward the catcher and is located near the lower end of the catcher in the key-released state, while the back check is on the lower surface when the catcher is locked. Make sliding contact.

  In an upright piano, the back check provided on a whippen that is supported to rotate the action generally follows an arc having a larger radius of curvature than the catcher provided on the bat supported to rotate the hammer. Move. Further, when the back check locks the catcher, the back check push-up portion is in sliding contact with the lower surface of the catcher, and when the back check moves away from the catcher, the lower surface of the catcher moves. Move across the trajectory from inside to outside. Thereby, the component force of the force acting on the catcher from the push-up portion of the back check or the component force of the frictional force acting between the push-up portion and the lower surface of the catcher acts to push up the catcher. As described above, the action whippen, hammer, etc. are configured in the same way as a general upright piano, but by providing the push-up part as described above for the back check, the action when the back check moves away from the catcher. It is possible to realize a backstop device that allows the hammer to be pushed up by a relatively simple and low cost.

  The invention according to claim 3 is the backstop device for the upright piano according to claim 1 or 2, wherein the back check comes into contact with the upper part of the catcher from above when the catcher is locked, and is pushed up. It further has the latching | locking part which latches in a state which clamped the catcher from the upper and lower sides in cooperation with the part.

  According to this configuration, when the back check locks the catcher, the back check locking portion and the push-up portion are in contact with the upper and lower portions of the catcher, respectively, and the catcher is clamped from above and below. To do. Thereby, the holding force of the back check with respect to a catcher can be made high, and a back stop can be performed still more stably.

It is a side view which shows the hammer, action, etc. of an upright piano to which the backstop apparatus by one Embodiment of this invention is applied in a key release state. It is explanatory drawing for demonstrating action | operation of action and a hammer, (a) is a state before a key press is started from a key release state and a hammer hits a string, (b) is a hammer hitting a string. Shows the state. FIG. 3 is an explanatory diagram following FIG. 2, in which (a) shows a state where the hammer catcher after stringing by pressing the key is locked to the back check (back stop), and (b) shows that the key release is started from the key pressing state. , Shows the state just before the back check leaves the catcher. It is explanatory drawing following FIG. 3, (a) is the state which the jack entered into the lower side of a bat, when a hammer rotates a little to the string side with pushing up of the catcher by a back check, (b) Indicates a state in which the hammer and the wippen have returned to their original positions in the key release state. It is a figure for demonstrating the force which acts on a catcher when a back check leaves | separates from a catcher, (a) is a side view which shows a hammer, an action, etc., (b) is a figure which expands and shows a catcher and a back check. It is. It is a figure which expands and shows the modified example of a back check, (a) shows the state in which the catcher was latched by the back check (back stop), and (b) shows the state just before the back check leaves the catcher.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an upright piano 2 to which a backstop device 1 according to an embodiment of the present invention is applied in a key release state. In the following description, the front side (right side in FIG. 1) of the upright piano 2 when viewed from the performer side is described as “front”, and the back side (left side in FIG. 1) is described as “rear”.

  The upright piano 2 includes a keyboard 3, an action 4, a hammer 5, and the like. The keyboard 3 is composed of a large number of keys 3a (only one is shown) arranged in the left-right direction. Each key 3a extends in the front-rear direction (left-right direction in FIG. 1), and is supported at the center so as to be rotatable about a balance pin 7a erected on the flange 7 on the shelf board 6.

  Action brackets (not shown) are respectively provided at the left and right end portions of the shelf board 6, and the action 4 is disposed above the rear end portion of the keyboard 3 between both action brackets. The action 4 includes a whippen 8 and a jack 9 which are provided for each key 3a. Between the left and right action brackets, a center rail 11, a hammer rail 12, and the like are passed so as to extend in the left-right direction (front and back direction in FIG. 1). The center rail 11 is screwed with a whippen flange 14 and a butt flange 15 for each key 3a. The whippen 8 is supported by the whippen flange 14 at its rear end so as to be rotatable via its center pin 14a, while the hammer 5 is supported by its center pin at the butt flange 15 at its lower end. It is rotatably supported via 15a.

  The wippen 8 is formed in a predetermined shape by a synthetic resin or the like, and is placed on a capstan button 3b provided at the rear end portion of the corresponding key 3a via a heel portion 8a protruding downward. Yes. Further, a back check wire 17 is erected at the front end portion of the upper surface of the wippen 8, and a back check 18 is attached to the tip end portion thereof. Further, a spoon 19 for driving a damper 25 described later is erected on the rear end portion of the upper surface of the wippen 8. The aforementioned whippen flange 14 is disposed immediately in front of the spoon 19, and the whippen flange 14 is fixed to the center rail 11 at the upper part thereof.

  The back check 18 is arranged at a predetermined distance in the vertical direction from each other, and protrudes obliquely upward and rearward by a predetermined length toward a catcher 33 (described later) of the hammer 5 and a lower side. It has a protruding portion 18b (push-up portion), and the side shape of the back check 18 is formed in a U shape that opens rearward. A felt 18c is attached to each of the opposing surfaces of the upper protrusion 18a and the lower protrusion 18b. In the key release state, the lower protrusion 18b faces the vicinity of the lower end of the catcher with a gap.

  The jack 9 is made of synthetic resin or the like, and has a side surface formed in an L shape by a base portion 9a extending in the front-rear direction and a hammer push-up portion 9b extending upward from the rear end portion. The jack 9 has a center pin on a flange portion 8b provided at a corner portion of the base portion 9a and the hammer push-up portion 9b so as to protrude upward at a predetermined position behind the back check wire 17 of the wippen 8. It is rotatably supported via 8c. A jack spring 10 is provided between the base portion 9a and the wippen 8 to urge the jack 9 in the counterclockwise direction of FIG.

  Further, as shown in FIG. 1, the center rail 11 is provided with a plurality of regulating brackets 21 (only one is shown) that extends forward, and a regulating rail 22 that is attached to the front end portion and extends in the left-right direction. It has been. Further, a regulating button 23 (only one is shown) is attached to the regulating rail 22 for each key 3a below the regulating rail 22.

  Further, behind the action 4, a damper 25 is provided for each key 3a via a damper flange 26. The damper 25 extends in the vertical direction, and a damper lever 25a rotatably supported by a damper flange 26 via a center pin 26a, a damper wire 25b extending upward from the upper end of the damper lever 25a, and the damper A damper head 25c attached to the upper end of the wire 25b, a damper lever spring 25d that urges the damper 25 toward the string S side, and the like are configured. The damper 25 is for stopping sound when the damper head 25c comes into contact with the string S by the biasing force of the damper lever spring 25d when the key is released.

  Like the action 4, the hammer 5 is provided for each key 3a, and includes a bat 31, a hammer head 32, a catcher 33, and the like. The bat 31 is formed in a predetermined shape with a synthetic resin or the like, and is supported at the lower end portion thereof so as to be rotatable by the bat flange 15 described above, whereby the hammer 5 is centered on the center pin 15a. Can be freely rotated.

  A bar-shaped hammer shank 34 is erected on the upper surface of the bat 31, and a hammer head 32 is provided on the upper end thereof. In addition, a bar-shaped catcher shank 35 extending forwardly downward is provided on the front surface of the bat 31, and a catcher 33 is provided at the front end thereof.

  The catcher 33 is formed in a block shape that extends in the vertical direction and has an upper surface and a lower surface inclined forward and downward, and is fixed to the catcher shank 35 at the center of the rear surface. In addition, a catcher skin 36 made of leather, for example, is attached to the catcher 33 over its upper surface, front surface, and lower surface.

  In the hammer 5 configured as described above, the hammer protruding portion 9b of the jack 9 described above engages with the protruding portion 31a formed by the front end portion of the lower surface of the bat 31 from below, It stands still with a small gap between it and the hammer rail 12. The backstop device 1 includes a back check 18 of the action 4 and a catcher 33 of the hammer 5. Hereinafter, the backstop operation of the hammer 5 by the backstop device 1 will be described with reference to FIGS. 1 to 5. A series of operations from the start of key pressing such as the action 4 and hammer 5 described above to the end of key release will be described.

  When the player presses the key 3a from the key release state of FIG. 1, the key 3a rotates around the balance pin 7a in the clockwise direction of the figure, and the whippen 8 placed on the rear end thereof. Is pivoted upward (counterclockwise in FIG. 1) about the center pin 14a of the Whippen frenzy 14 by being pushed up by the key 3a. As the whippen 8 rotates, the jack 9 and the back check 18 provided on the whippen 8 move together, and the hammer 5 is pushed up by the hammer push-up portion 9b of the jack 9, Centering on the center pin 15a of the butt flange 15, it rotates counterclockwise toward the rear string S.

  When the whippen 8 rotates to a predetermined angle after the key pressing is started, as shown in FIG. 2A, the spoon 19 comes into contact with and presses the lower end of the damper lever 25a, so that the damper lever 25a is The damper lever spring 25d rotates clockwise against the urging force of the damper lever spring 25d.

  Further, the front end portion of the base portion 9 a of the jack 9 abuts on the regulating button 23 from below by the rotation of the wippen 8. As a result, the jack 9 is restricted from moving upward by the regulating button 23, thereby resisting the urging force of the jack spring 10 against the whippen 8, with the center pin 8 c of the frenzy part 8 b as the center. Try to rotate clockwise. As shown in FIG. 2 (b), the jack 9 is disengaged from the pushed-up portion 31 a of the bat 31 and is detached from the hammer 5, so that the jack 9 is against the wippen 8. Rotate clockwise. The hammer 5 is rotated by inertia even after the jack 9 is detached, and the hammer head 32 strikes the string S and vibrates it to generate a piano sound. The hammer 5 that has struck the string starts to return and rotate in the clockwise direction by the repulsive force of the string S.

  The hammer 5 is locked to the back check 18 in the following manner during the return rotation. As the hammer 5 returns and rotates, the catcher 33 moves toward the front back check 18, while as the wippen 8 rotates counterclockwise, the back check 18 moves toward the rear catcher 33. . 3A, the catcher 33 enters between the upper protrusion 18a and the lower protrusion 18b of the back check 18, and the upper surface of the lower protrusion 18b slides on the lower surface of the catcher 33. Thus, the catcher 33 is locked in a state of being sandwiched from above and below by the upper protrusion 18a and the lower protrusion 18b. As a result, the hammer 5 stops at a predetermined angular position shown in FIG. 3A, and its return rotation is temporarily stopped. The rebound of the hammer 5 is prevented by the back stop operation of the hammer 5 as described above.

  When the key depression is completed and the key release of the key 3a is started, as shown in FIG. 3B, both the wippen 8 and the hammer 5 start to rotate clockwise, and the back check 18 is moved from the catcher 33. Move away.

  FIG. 5 shows both the operation and the force acting on the catcher 33 when the back check 18 moves away from the catcher 33. As shown in FIG. 5A, when the back check 18 moves away from the catcher 33, the wippen 8 rotates around the center pin 14a of the wippen frenzy 14, so that it contacts the catcher 33 of the back check 18. The lower protrusion 18b moves along an arc (see circle B) having a large radius of curvature with the center pin 14a as the center. On the other hand, since the hammer 5 rotates about the center pin 15a of the butt flange 15, the portion of the catcher 33 that contacts the back check 18 (lower projecting portion 18b) is an arc having a small radius of curvature centering on the center pin 15a. Move along (see circle L). Further, when the back check 18 moves away from the catcher 33, the lower protrusion 18b of the back check 18 crosses from the inside to the outside with respect to an arcuate locus (see circle L) on which the lower surface of the catcher 33 moves. To move.

  Thereby, when the back check 18 moves away from the catcher 33, the force component acting on the catcher 33 from the lower protruding portion 18 b of the back check 18 or the friction generated between the lower protruding portion 18 b and the catcher 33. The force component acts to push up the catcher 33 as shown by the white arrow in FIG. As a result, the hammer 5 rotates slightly in the counterclockwise direction, that is, toward the string S side, with the center pin 15a of the butt flange 15 as the center.

  In this case, as shown in FIG. 4A, the jack 9 that has been detached from the bat 31 of the hammer 5 is rotated counterclockwise by the urging force of the jack spring 10, and the hammer push-up portion 9 b is moved to the bat 31. It enters the lower side and engages with the raised portion 31a. Therefore, in this case, if the key 3a is pressed again after the key release of the pressed key 3a is started and before the key 3a is completely released, the above-described key-pressing time In the same manner as the operation, the hammer 5 is pushed up by the jack 9 and hits the string S.

  When the key 3a is completely released without the key 3a being depressed after the back check 18 is separated from the catcher 33, as shown in FIG. 4B, the whippen 8 and the back check are performed. 18 returns to the original position in the key released state, and the hammer shank 34 of the hammer 5 comes into contact with the hammer rail 12 to return to the original position in the key released state.

  As described above in detail, according to the backstop device 1 of the present embodiment, the hammer 5 that is pushed up by the jack 9 of the action 4 and hits the string S by turning is accompanied by the catcher 33. Is held in contact with the back check 18 and stopped in the middle of the return rotation. Thereby, the hammer 5 is backstopped and rebound after stringing is prevented. Further, after the back stop, when the back check 18 moves away from the catcher 33, the catcher 33 is pushed up by the lower protrusion 18 b of the back check 18, thereby allowing the hammer 9 to be pushed up by the jack 9. Thus, since the jack 5 can be pushed up by the jack 9 after the backstop and before the return rotation of the hammer 5 is completed, unlike the conventional upright piano, the depressed key 3a is released. When the key is pressed again before returning, the string S can be appropriately hit with the hammer 5. Therefore, according to the present embodiment, it is possible to improve the repeatability of the key 3a in the upright piano 2.

  Further, the back check 18 having the lower protruding portion 18b is provided while the whippen 8 and the hammer 5 of the action 4 are configured in the same manner as a general upright piano, so that the back check 18 is separated from the catcher 33. In this case, the backstop device 1 that allows the hammer 5 to be pushed up by the jack 9 can be realized relatively easily and at low cost. Furthermore, the upper protrusion 18a and the lower protrusion 18b of the back check 18 are in contact with the upper and lower portions of the catcher 33, respectively, and are locked in a state where the catcher 33 is sandwiched from above and below. Thereby, the holding force of the back check 18 with respect to the catcher 33 can be increased, and the back stop can be performed more stably.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, the back check 18 is provided with the upper protrusion 18a and the lower protrusion 18b. However, the present invention is not limited to this, for example, as shown in FIG. The upper protrusion 18a may be omitted, and the side shape of the rear half of the back check 18 may be formed in an L shape. In this back check 18 ', when catching the catcher 33, as shown in FIG. 6 (a), the catcher 33 is locked in a state where almost the entire front and bottom surfaces of the catcher 33 are in contact with the back check 18'. Thereby, a stable backstop can be secured. Further, as shown in FIG. 6 (b), the back check 18 'pushes up the catcher 33 by the lower protrusion 18b when leaving the catcher 33 as in the case of the back check 18 described above. In addition, the hammer 5 can be pushed up by the jack 9 before the return rotation of the hammer 5 is completed.

  Further, the detailed configurations of the catcher 33 and the back checks 18 and 18 'constituting the backstop device 1 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the gist of the present invention. .

DESCRIPTION OF SYMBOLS 1 Backstop device 2 Upright piano 3 Keyboard 3a Key 4 Action 5 Hammer 8 Whippen 9 Jack 11 Center rail 14 Whippen frenzy 15 Butt frenzy 17 Back check wire 18 Back check 18 'Back check 18a Upper protrusion part (locking part)
18b Lower protrusion (push-up part)
31 Bat 31a Raised part 33 Catcher 34 Hammer shank 35 Catcher shank S String

Claims (3)

This is an upright piano backstop device that stops the hammer that returns and rotates after striking in an upright piano that strikes a string by being pushed up by an action and turning as the key is pressed. And
A catcher provided on the hammer;
A back check that is provided in the action and stops the hammer by locking the catcher while the catcher is in contact with the hammer during the return rotation;
With
When the catcher is locked, the back check comes into contact with the lower part of the catcher from below, and after the hammer is stopped and before the return rotation is completed, A backstop device for an upright piano, comprising a push-up portion for pushing up the catcher so as to allow the push-up of the upright piano. The catcher is attached to a bat rotatably supported by the hammer via a catcher shank extending in the front-rear direction,
The back check is attached to a whippen that is rotatably supported by the action via a back check wire extending in the vertical direction,
The push-up portion is formed so as to protrude obliquely upward toward the catcher, is located near the lower end of the catcher in a key-released state, and when the back check locks the catcher, 2. The backstop device for an upright piano according to claim 1, wherein the backstop device is configured to be in sliding contact with the lower surface.   When the catcher is locked, the back check comes into contact with the upper part of the catcher from above, and cooperates with the push-up part to lock the catcher while holding the catcher from above and below. The backstop device for an upright piano according to claim 1 or 2, further comprising:

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