JP5610130B2 - Lid opening / closing device - Google Patents

Description

  The present invention relates to a lid opening / closing device used for a keyboard instrument such as an electronic piano or an electronic organ or an acoustic device.

  Conventionally, in a lid opening / closing device, as described in Patent Document 1, a lid is rotatably attached to a case by a support shaft, a gear portion is provided on the lid, and the damper is engaged with the gear portion to rotate. A structure in which a damper member having a gear is attached so as to be movable along the outer periphery of the gear portion is known.

Japanese Patent Laid-Open No. 06-33972

  This type of lid opening / closing device disables the damper function of the damper member by opening the damper body from its initial state along the outer periphery of the gear portion as the lid body rotates. Thereafter, the damper member is prevented from moving to exhibit a damper function with respect to the lid.

  However, in such a conventional lid opening and closing device, when the lid is opened, the damper member moves from the initial state along the outer periphery of the gear portion along with the rotation of the lid, so that the damper function of the damper member When the lid starts to open, the lid closes rapidly due to the weight of the lid when the lid is closed. If the weight is heavy, there is a risk of injury from your hands or fingers.

  The problem to be solved by the present invention is to provide a lid opening / closing device that has a good lid opening / closing operability and can safely close the lid.

In order to solve the above problems, the present invention includes the following components.
According to the first aspect of the present invention, a case, a lid that is rotatably attached to the case by a support shaft, an interlocking gear that rotates together with the lid around the support shaft, and the interlocking gear mesh with the case. A lid opening / closing device comprising a damper member having a rotating damper gear and braking the rotation of the interlocking gear, wherein a lower end portion is rotatably attached to the case and the damper member is attached to an upper portion; A link member that guides the gear so as to be able to swing in a direction away from the interlocking gear; the interlocking gear is supported by the support shaft at a position eccentric from the center of the pitch circle of the tooth portion; The distance from the support shaft to the tooth portion is short when the keyboard cover is in the middle of closing, and the distance from the support shaft to the tooth portion is in the state until the keyboard cover is completely closed. A lid opening and closing device, characterized in that but gradually increased.

  According to a second aspect of the present invention, the interlocking gear is formed in a substantially fan shape including a part of a circular shape, and the tooth portion is located in the middle of the substantially fan shape from the center of the pitch circle of the tooth portion. The lid opening / closing device according to claim 1, wherein a position biased toward the center is supported by the support shaft.

  According to a third aspect of the present invention, the interlocking gear is formed in a substantially fan shape composed of a part of a spiral shape, and the pitch circle of the tooth portion forms a spiral shape, and the center of the spiral pitch circle is formed. The lid opening / closing device according to claim 1, wherein a position biased toward the tooth portion located on the small diameter side from the base is supported by the support shaft.

  According to a fourth aspect of the present invention, there is provided an urging member for elastically pressing and engaging the damper gear of the damper member with the tooth portion of the interlocking gear. It is a lid | cover opening / closing apparatus in any one of Claim 3.

  According to the present invention, when the lid is opened and closed, the rotating operation of the lid can be braked by the damper member, and when the lid is closed, the damper with respect to the lid is in the middle of the closing. The braking force of the member can be weakened, and the braking force of the damper member against the lid can be gradually increased when the lid is in a state until the lid is completely closed. For this reason, since the lid can be closed slowly when the lid has been closed, the lid can be opened and closed easily, and the lid can be safely injured without pinching hands or fingers. Can be closed.

It is sectional drawing which showed Embodiment 1 which applied this invention to the keyboard musical instrument. FIG. 2 is an enlarged cross-sectional view showing a main part of the keyboard instrument shown in FIG. 1. FIG. 3 is an enlarged front view showing interlocking gears in the keyboard musical instrument shown in FIG. 2. The damper member attachment structure in the keyboard musical instrument shown in FIG. 2 is shown, (a) is the enlarged view which fractured | ruptured and showed the part, (b) is the expanded sectional view in the AA arrow of (a). It is. FIG. 2 is a cross-sectional view showing a state in which a keyboard lid is opened at a predetermined angle in the keyboard instrument shown in FIG. 1. FIG. 6 is a cross-sectional view showing a state in which the keyboard cover is completely opened in the keyboard instrument shown in FIG. 5. It is sectional drawing which showed Embodiment 2 which applied this invention to the keyboard musical instrument. It is the expanded sectional view which showed the principal part of the keyboard musical instrument shown by FIG. FIG. 8 shows a damper member mounting structure in the keyboard musical instrument shown in FIG. 8, (a) is an enlarged view showing a part thereof, and (b) is a partly broken view taken along the line B-B in (a). It is the enlarged view shown. FIG. 8 is a cross-sectional view showing a state where a keyboard lid is opened at a predetermined angle in the keyboard instrument shown in FIG. 7. It is sectional drawing which showed the state which opened the keyboard cover completely in the keyboard musical instrument shown in FIG. It is sectional drawing which showed Embodiment 3 which applied this invention to the keyboard instrument. FIG. 13 is an enlarged cross-sectional view showing a main part of the keyboard instrument shown in FIG. 12. It is the enlarged front view which showed the interlocking gearwheel in the keyboard musical instrument shown by FIG. FIG. 13 is a cross-sectional view showing a state in which the keyboard cover is completely opened in the keyboard instrument shown in FIG. 12.

(Embodiment 1)
A first embodiment in which the present invention is applied to a keyboard instrument will be described below with reference to FIGS.
As shown in FIG. 1, the keyboard instrument includes a musical instrument case 1. The musical instrument case 1 stands on a pair of side plates 2 that also serve as legs, a bottom plate 3 provided on the upper side between the pair of side plates 2, and a front end portion (left end portion in FIG. 1) of the bottom plate 3. And a rear plate 5 provided upright on the rear end portion (the right end portion in FIG. 1) of the bottom plate 3.

  Thereby, the musical instrument case 1 is formed in a box shape with an open top. Inside the musical instrument case 1, as shown in FIG. 1, a keyboard portion 6 is provided. The keyboard section 6 includes a white key 7a and a black key 7b, and a large number of these white keys 7a and black keys 7b are arranged in a vertically rotatable manner on a keyboard chassis (not shown). ing.

  Further, as shown in FIG. 1, a keyboard lid 8 that covers the keyboard portion 6 so as to be freely opened and closed is provided at the upper portion of the musical instrument case 1 so that the lid can be opened and closed. The keyboard lid 8 is rotated in the vertical direction by the lid opening / closing device 10 so as to cover the keyboard portion 6 when the instrument case 1 is closed when the instrument case 1 is closed, as shown in FIG. The keyboard unit 6 is configured to be exposed above the musical instrument case 1 when the musical instrument case 1 is opened by standing slightly behind the musical instrument case 1 (right side in FIG. 6).

  As shown in FIGS. 1 and 2, the lid opening / closing device 10 for the keyboard lid 8 includes an arm member 11 attached to the lower surface of the keyboard lid 8, and a side plate 2 in the instrument case 1 attached to the arm member 11. A support shaft 12 that is rotatably attached to the arm member 11, an interlocking gear 13 that is attached to the arm member 11 and rotates around the support shaft 12 together with the keyboard cover 8, and an attachment member provided on the bottom plate 3 of the musical instrument case 1. 14 and a damper member 15 that brakes the opening / closing operation of the keyboard lid 8.

  As a result, the keyboard cover 8 is configured to rotate in the vertical direction together with the arm member 11 around the support shaft 12 as shown in FIGS. 1 and 2. In this case, the arm member 11 is attached to the rear portion (the right side portion in FIG. 2) of the lower surface of the keyboard lid 8 and is configured to be inserted into the rear portion of the musical instrument case 1 from above. As shown in FIGS. 1 and 2, the support shaft 12 is attached to the lower part of the arm member 11 inserted into the musical instrument case 1. The support shaft 12 is rotatably attached to a pair of side plates 2 located at the rear portion (right side portion in FIG. 2) in the musical instrument case 1, whereby the arm member 11 is configured to rotate together with the keyboard lid 8. Yes.

  As shown in FIGS. 1 and 2, the interlocking gear 13 is configured to transmit the opening / closing operation of the keyboard lid 8 to the damper member 15 when the arm member 11 rotates with the keyboard lid 8 around the support shaft 12. Has been. That is, as shown in FIGS. 2 and 3, the interlocking gear 13 is formed in a generally fan shape and has a tooth portion 13a on the outer peripheral surface thereof. In this case, as shown in FIG. 3, the interlocking gear 13 is configured such that the position eccentric from the center Q of the pitch circle P of the tooth portion 13 a is supported by the support shaft 12.

  That is, as shown in FIG. 3, when the radius of the pitch circle P is R, the interlocking gear 13 has a distance S from the center Q of the pitch circle P toward the tooth portion 13a located substantially in the middle of the fan shape. Only the eccentric position is supported by the support shaft 12. Specifically, the interlocking gear 13 has a substantially fan shape with an opening angle of approximately 130 degrees as a whole, and the support shaft 12 extends from the center Q of the pitch circle P by a distance S along the substantially fan-shaped center line L. Is out of position. Therefore, as shown in FIG. 3, the interlocking gear 13 has the shortest distance from the tooth portion 13 a located on the center line L to the support shaft 12 and is supported from the tooth portion 13 a located in the vertical direction of the center line L. The distance to the shaft 12 is configured to gradually increase.

  As a result, as shown in FIGS. 1 and 2, the interlocking gear 13 has a tooth portion 13 a located on the upper side of the substantially fan-shaped portion on the damper gear 15 a of the damper member 15 when the keyboard cover 8 is closed. When the rotational speed of the interlocking gear 13 is constant, the rotational speed of the damper gear 15a is increased by increasing the distance between the teeth 13a located on the upper side and the support shaft 12 by meshing. Yes.

  Further, as shown in FIG. 5, when the keyboard cover 8 is in the middle of opening and closing, the interlocking gear 13 is engaged with the damper gear 15a of the damper member 15 with the tooth portion 13a located at the substantially fan-shaped intermediate portion, By shortening the distance from the tooth portion 13a located at the intermediate portion to the support shaft 12, the rotational speed of the damper gear 15a is increased when the rotational speed of the interlocking gear 13 is constant.

  Further, as shown in FIG. 6, the interlocking gear 13 has a tooth portion 13 a located on a substantially fan-shaped lower side meshing with the damper gear 15 a of the damper member 15 when the keyboard cover 8 is fully opened. When the rotational speed of the interlocking gear 13 is constant, the rotational speed of the damper gear 15a is increased by increasing the distance from the tooth portion 13a located on the lower side to the support shaft 12. .

  On the other hand, the damper member 15 includes a damper gear 15 a that meshes with the interlocking gear 13 as shown in FIGS. 1 and 2. In this case, as shown in FIGS. 4 (a) and 4 (b), the damper member 15 is provided with a rotating shaft (not shown) in the housing 15b. A braking function is provided by applying a load by means of an unillustrated), and a damper gear 15a is provided on a rotating shaft protruding outside the housing 15b. In this case, the housing 15b is provided with guide protrusions 15c on the upper and lower portions thereof.

  1 and 2, the damper member 15 is urged by a spring member 16 in a direction in which the damper gear 15a of the damper member 15 is engaged with the tooth portion 13a of the interlocking gear 13. It is movably attached to an attachment member 14 provided on the bottom plate 3 in the case 1. In this case, as shown in FIG. 2, the mounting member 14 has the damper member 15 so that the center of the damper gear 15 a of the damper member 15 is substantially the same height as the support shaft 12 that is the rotation center of the interlocking gear 13. Configured to hold.

  That is, as shown in FIGS. 2 and 4, the mounting member 14 is provided with a damper housing groove 14 a in which the housing 15 b of the damper member 15 is movably disposed along the contact / separation direction with respect to the interlocking gear 13. ing. In addition, a damper guide groove 14b that guides the holding member 14 while holding the guide projection 15c of the housing 15b is provided along the contact / separation direction with respect to the interlocking gear 13 at locations on the upper and lower portions of the damper housing groove 14a of the mounting member 14. ing. Further, the mounting member 14 is provided with a spring accommodating groove 14c for accommodating the spring member 16 so as to be continuous with the damper accommodating groove 14a.

  As shown in FIGS. 1 and 2, the spring member 16 is a coil spring and is provided so as to be able to protrude and retract in the spring accommodating groove portion 14 c of the mounting member 14 in the vicinity of the damper member 15 located on the opposite side to the interlocking gear 13. ing. That is, the spring member 16 is located on one end (in FIG. 2) in a state where the spring member 16 is positioned on a straight extension line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15. The right end portion is in contact with the damper member 15, and the other end portion (left end portion in FIG. 2) is disposed in the spring accommodating groove portion 14 c of the mounting member 14.

  Thereby, as shown in FIG. 2, the spring member 16 rotates the interlocking gear 13 on a straight line connecting the support shaft 12 that is the center of rotation of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15. Even if the distance from the support shaft 12 that is the center to the tooth portion 13a of the interlocking gear 13 varies depending on the rotation of the interlocking gear 13, the damper member 15 is pressed toward the interlocking gear 13 so that the damper member 15 is The damper gear 15a of the damper member 15 is configured to always mesh with the tooth portion 13a of the interlocking gear 13 by moving along the storage groove portion 14a.

Next, the operation of the lid opening / closing device 10 of the keyboard lid 8 will be described.
When the keyboard lid 8 is closed from the opened state, as shown in FIG. 6, the tip end portion (upper end portion in FIG. 6) of the keyboard lid 8 is pulled toward the front side and tilted. At this time, the tooth portion 13 a located on the lower side of the interlocking gear 13 is engaged with the damper gear 15 a of the damper member 15. Therefore, on the straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15, the tooth portion of the interlocking gear 13 from the support shaft 12 that is the rotation center of the interlocking gear 13. The distance to 13a is long.

  For this reason, as shown in FIG. 6, the damper member 15 is pushed against the spring force of the spring member 16 by the interlocking gear 13, and the guide protrusion 15 c of the damper member 15 is guided by the damper guide groove 14 b of the mounting member 14. However, the housing 15b of the damper member 15 is disposed by being pushed into the back side (the portion located on the left side in FIG. 6) on the opposite side (left side in FIG. 6) to the interlocking gear 13 in the damper housing groove 14a of the mounting member 14. ing.

  In this state, when the front end portion (upper end portion in FIG. 6) of the keyboard lid 8 is pulled down to tilt the keyboard lid 8, the keyboard lid 8 rotates counterclockwise around the support shaft 12 of the arm member 11. . Then, the interlocking gear 13 provided on the arm member 11 also rotates counterclockwise around the support shaft 12 together with the keyboard cover 8, and accordingly, the damper gear 15 a of the damper member 15 is moved to the tooth portion 13 a of the interlocking gear 13. Rotate to mesh with.

  At this time, a load is applied to the interlocking gear 13 by the damper member 15, so that the rotation of the interlocking gear 13 is braked. For this reason, the keyboard lid 8 does not rotate rapidly in the closing direction. At this time, the support shaft 12 that is the center of rotation of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15 are connected to the center of the interlocking gear 13 from the support shaft 12 that is the center of rotation of the interlocking gear 13. The distance to the tooth portion 13a is gradually shortened.

  For this reason, the damper member 15 is pushed out to the interlocking gear 13 side by the spring force of the spring member 16, and the damper gear 15a always meshes with the tooth portion 13a of the interlocking gear 13 and rotates, and the rotational speed of the damper gear 15a gradually increases. To be late. Thereby, the damper member 15 gradually reduces the load on the interlocking gear 13.

  That is, when the distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is gradually shortened, the rotational speed of the damper gear 15a is gradually decreased, so that the damper gear 15a by the damper member 15 is reduced. , And the load on the interlocking gear 13 gradually decreases. For this reason, the force for closing the keyboard lid 8 is gradually reduced, and the operation for closing the keyboard lid 8 is gradually accelerated.

  As shown in FIG. 5, when the keyboard cover 8 is closed to an angle of about 50 degrees, the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15 are connected. On the straight line, the distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is the shortest. At this time, the rotational speed of the damper gear 15a of the damper member 15 is the slowest. For this reason, the rotational torque of the damper gear 15a by the damper member 15 becomes the smallest, and accordingly, the force for closing the keyboard lid 8 becomes the lightest and the operation for closing the keyboard lid 8 becomes the fastest.

  Thereafter, when the keyboard cover 8 is further closed, the support shaft that is the rotation center of the interlocking gear 13 on the straight line that connects the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15. The distance from 12 to the tooth portion 13a of the interlocking gear 13 is gradually increased. For this reason, the damper member 15 is gradually pushed to the opposite side to the interlocking gear 13 against the spring force of the spring member 16. Also at this time, the damper gear 15a always meshes with the tooth portion 13a of the interlocking gear 13 and rotates, and the rotational speed of the damper gear 15a gradually increases.

  Thereby, the damper member 15 gradually increases the load on the interlocking gear 13. That is, when the distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is gradually increased, the rotational speed of the damper gear 15a is gradually increased, and therefore the damper gear 15a by the damper member 15 is increased. And the load on the interlocking gear 13 gradually increases. For this reason, the force for closing the keyboard lid 8 is gradually increased, and the operation for closing the keyboard lid 8 is gradually delayed.

  As shown in FIGS. 1 and 2, when the keyboard cover 8 is completely closed, a straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15. , The distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is the longest. At this time, the rotational speed of the damper gear 15a of the damper member 15 is the fastest.

  For this reason, the rotational torque of the damper gear 15a by the damper member 15 becomes the largest, and accordingly, the force for closing the keyboard lid 8 becomes the heaviest and the keyboard lid 8 closes slowly. As a result, when the keyboard cover 8 is completely closed, the keyboard cover 8 does not rotate suddenly, so that there is little risk that the user will get injured by holding the hand or fingers with the keyboard cover 8 and the keyboard cover 8 is safe. The lid 8 can be closed. When the keyboard cover 8 is opened from the closed state, the keyboard cover 8 can be opened by performing an operation reverse to the above-described operation.

  As described above, according to the lid opening / closing device 10 for the keyboard lid 8, the interlocking gear 13 that rotates together with the keyboard lid 8 about the support shaft 12 that rotatably attaches the keyboard lid 8 to the musical instrument case 1 has the tooth portion 13a. Is supported by the support shaft 12 at a position eccentric from the center Q of the pitch circle P, and when the keyboard cover 8 is in the middle of closing, the distance from the support shaft 12 to the tooth portion 13a is shortened, and the keyboard cover 8 is closed. In this state, the distance from the support shaft 12 to the tooth portion 13a is gradually increased. Therefore, the keyboard lid 8 can be opened and closed easily, and the keyboard lid 8 can be opened and closed safely.

  That is, in the lid opening / closing device 10 for the keyboard lid 8, when the keyboard lid 8 is closed, the rotational operation of the keyboard lid 8 can be braked by the damper member 15, and the keyboard lid 8 is in the middle of closing from the opened state. When the state is in a state, the braking force of the damper member 15 against the keyboard cover 8 is weakened to lighten the closing force of the keyboard cover 8, and the keyboard cover 8 can be rotated quickly. It is possible to gradually increase the braking force of the damper member 15 against the keyboard lid 8 to gradually increase the force to close the keyboard lid 8 and to rotate the keyboard lid 8 slowly. For this reason, the opening / closing operability of the keyboard lid 8 is good, and the keyboard lid 8 can be safely closed without causing injury by pinching the hand or fingers with the keyboard lid 8.

  In this case, the interlocking gear 13 is formed in a substantially fan shape composed of a part of a circular shape, and the position offset from the center of the pitch circle P toward the tooth portion 13a located substantially in the middle of the fan shape is on the support shaft 12. By being supported, the distance from the tooth portion 13a to the support shaft 12 can be varied according to the opening / closing operation of the keyboard lid 8. That is, the interlocking gear 13 has a fan shape with an opening angle of approximately 130 degrees as a whole, and the position of the support shaft 12 is shifted from the center Q of the pitch circle P by a distance S along the center line L. The distance from the tooth portion 13a located on the center line L to the support shaft 12 can be made the shortest, and the distance from the tooth portion 13a located in the vertical direction of the center line L to the support shaft 12 can be gradually increased. Can do.

  For this reason, when the keyboard lid 8 is closed, the distance from the tooth portion 13a to the support shaft 12 can be increased at the beginning of the closing, so that the rotational speed of the damper gear 15a of the damper member 15 is increased. Thus, the braking force of the damper member 15 against the keyboard lid 8 can be increased. Further, when the keyboard lid 8 is in the middle of closing, the distance from the tooth portion 13a to the support shaft 12 can be shortened, so that the rotational speed of the damper gear 15a of the damper member 15 is slowed down to the keyboard lid 8. The braking force of the damper member 15 can be weakened.

  Further, when the keyboard cover 8 is closed, the distance from the tooth portion 13a to the support shaft 12 can be gradually increased again. Therefore, the rotational speed of the damper gear 15a of the damper member 15 is gradually increased to increase the keyboard cover. Thus, the braking force of the damper member 15 against 8 can be gradually increased. For this reason, even if the weight of the keyboard cover 8 is heavy, the opening / closing force and opening / closing speed of the keyboard cover 8 can be changed according to the opening / closing operation of the keyboard cover 8, thereby improving the opening / closing operability of the keyboard cover. The keyboard lid 8 can be closed.

  Further, the lid opening / closing device 10 of the keyboard lid 8 includes the spring member 16 that elastically presses and meshes the damper gear 15a of the damper member 15 with the tooth portion 13a of the interlocking gear 13, so that the rotation of the interlocking gear 13 is performed. The position of the support shaft 12 that is the center is shifted from the center Q of the pitch circle P by a distance S along the center line L of the interlocking gear 13 so that the meshing position of the interlocking gear 13 and the damper gear 15a of the damper member 15 is achieved. Even if it moves along the center line L, the tooth portion 13a of the interlocking gear 13 and the damper gear 15a of the damper member 15 can be reliably meshed with each other by the spring force of the spring member 16.

  In this case, the mounting member 14 for mounting the damper member 15 to the musical instrument case 1 includes a damper housing groove portion 14a and a damper guide groove that guide the damper member 15 while holding the damper member 15 so as to be movable toward and away from the interlocking gear 13. 14b is provided, the damper member 15 can be satisfactorily guided along the center line L, whereby the meshing position of the interlocking gear 13 and the damper gear 15a of the damper member 15 is along the center line L. Even if it moves, the tooth portion 13a of the interlocking gear 13 and the damper gear 15a of the damper member 15 can be meshed reliably and satisfactorily.

(Embodiment 2)
Next, a second embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
As shown in FIG. 7, the keyboard instrument has a configuration in which the lid opening / closing device 20 is different from that of the first embodiment, and the configuration other than this is substantially the same as that of the first embodiment.

  That is, as shown in FIGS. 7 and 8, the lid opening / closing device 20 is configured to guide the damper member 15 so as to be movable toward and away from the interlocking gear 13 by the link member 21. The link member 21 is arranged in a standing state between the spring member 16 provided on the attachment member 14 and the interlocking gear 13.

  In this case, as shown in FIG. 8, the lower end portion of the link member 21 is rotatably attached to the lower portion of the attachment member 14 by the attachment shaft 22, and as shown in FIGS. 9 (a) and 9 (b). The housing 15b of the damper member 15 is attached to the upper part by screws 23. As a result, the link member 21 is configured to swing between the spring member 16 and the interlocking gear 13 around the mounting shaft 22.

  Also in this case, the damper member 15 is provided with a rotating shaft (not shown) in the housing 15b as in the first embodiment, and a load is applied to the rotating shaft by oil or a friction member (none shown). Thus, it has a braking function and has a configuration in which a damper gear 15a is provided on a rotating shaft protruding to the outside of the housing 15b. Further, as shown in FIG. 8, the damper member 15 is urged toward the interlocking gear 13 together with the link member 21 by the spring force of the spring member 16, so that the damper gear 15 a always meshes with the interlocking gear 13. Thus, the rotation of the interlocking gear 13 is braked.

  Similarly to the first embodiment, the interlocking gear 13 has a substantially fan shape with an opening angle of approximately 130 degrees as a whole, and a support shaft from the center Q of the pitch circle P by a distance S along the substantially fan-shaped center line L. 12 is misaligned. That is, as in the first embodiment, the interlocking gear 13 has the shortest distance from the tooth portion 13a located on the center line L to the support shaft 12, and from the tooth portion 13a located in the vertical direction of the center line L to the support shaft. The distance up to 12 is gradually increased.

Next, the operation of the lid opening / closing device 20 of the keyboard lid 8 will be described.
Also in this case, when closing the keyboard lid 8, as shown in FIG. 11, the tip end portion (upper end portion in FIG. 11) of the keyboard lid 8 is pulled toward the front side and tilted. At this time, as shown in FIG. 11, the tooth portion 13 a located on the lower side of the interlocking gear 13 meshes with the damper gear 15 a of the damper member 15. As a result, on the straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15, the teeth of the interlocking gear 13 from the support shaft 12 that is the rotation center of the interlocking gear 13. The distance to 13a is long.

  For this reason, as shown in FIG. 11, the damper gear 15 is pushed against the spring force of the spring member 16 by the interlocking gear 13, and the link member 21 rotates counterclockwise around the mounting shaft 22, The damper member 15 attached to the link member 21 is disposed so as to move to the side opposite to the interlocking gear 13 (left side in FIG. 11).

  In this state, the front end portion (upper end portion in FIG. 11) of the keyboard lid 8 is pulled down to close the keyboard lid 8. At this time, the keyboard cover 8 rotates counterclockwise around the support shaft 12 of the arm member 11. Then, the interlocking gear 13 provided on the arm member 11 also rotates counterclockwise around the support shaft 12 together with the keyboard cover 8, and accordingly, the damper gear 15 a of the damper member 15 is moved to the tooth portion 13 a of the interlocking gear 13. Rotate to mesh with.

  At this time, since the load is applied to the interlocking gear 13 by the damper member 15, the rotation of the interlocking gear 13 is braked, so that the keyboard lid 8 does not rotate rapidly in the closing direction. At this time, the support shaft 12 that is the center of rotation of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15 are connected to the center of the interlocking gear 13 from the support shaft 12 that is the center of rotation of the interlocking gear 13. The distance to the tooth portion 13a is gradually shortened.

  For this reason, the damper member 15 is gradually pushed out by the spring force of the spring member 16, and accordingly, the link member 21 gradually rotates clockwise around the mounting shaft 22, so that the damper gear 15 a is rotated by the teeth of the interlocking gear 13. Engage with part 13a. In this state, when the damper gear 15a is rotated by the interlocking gear 13, the distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is gradually shortened, so that the rotational speed of the damper gear 15a is reduced. Gradually slows down.

  Thereby, the damper member 15 gradually reduces the load on the interlocking gear 13. That is, when the rotational speed of the damper gear 15a gradually decreases, as in the first embodiment, the rotational torque of the damper gear 15a by the damper member 15 gradually decreases, and accordingly, the load on the interlocking gear 13 gradually decreases. . For this reason, the force for closing the keyboard lid 8 is gradually reduced, and the operation for closing the keyboard lid 8 is gradually accelerated.

  As shown in FIG. 10, when the keyboard lid 8 is closed to an angle of about 50 degrees, the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15 are connected. On the straight line, the distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is the shortest. At this time, the damper member 15 is most pushed out by the spring force of the spring member 16, and accordingly, the link member 21 rotates clockwise around the mounting shaft 22, and the damper gear 15a is moved to the tooth portion 13a of the interlocking gear 13. Engage.

  In this state, when the damper gear 15 a is rotated by the interlocking gear 13, the distance from the support shaft 12, which is the rotation center of the interlocking gear 13, to the tooth portion 13 a of the interlocking gear 13 is the shortest. Is the slowest. For this reason, the rotational torque of the damper gear 15a by the damper member 15 becomes the smallest, and accordingly, the load on the interlocking gear 13 becomes the smallest. Therefore, the force for closing the keyboard lid 8 becomes the lightest and the keyboard lid 8 is closed. The speed is the fastest.

  Thereafter, when the keyboard cover 8 is further closed, the support shaft that is the rotation center of the interlocking gear 13 on the straight line that connects the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15 a of the damper member 15. The distance from 12 to the tooth portion 13a of the interlocking gear 13 is gradually increased. For this reason, the damper member 15 is pushed against the spring force of the spring member 16 on the side opposite to the interlocking gear 13, and accordingly, the link member 21 rotates counterclockwise around the mounting shaft 22. The state where the gear 15a is engaged with the tooth portion 13a of the interlocking gear 13 is maintained.

  Also at this time, the damper gear 15a always meshes with the tooth portion 13a of the interlocking gear 13 and rotates, and the distance from the support shaft 12 that is the center of rotation of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is gradually increased. Thus, the rotational speed of the damper gear 15a is gradually increased. Thereby, like Embodiment 1, the rotational torque of the damper gear 15a by the damper member 15 becomes large gradually, and the load with respect to the interlocking gear 13 becomes large gradually in connection with this. For this reason, the force for closing the keyboard lid 8 gradually increases and the speed for closing the keyboard lid 8 gradually decreases.

  As shown in FIGS. 7 and 8, when the keyboard cover 8 is completely closed, a straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15a of the damper member 15 is used. , The distance from the support shaft 12 that is the rotation center of the interlocking gear 13 to the tooth portion 13a of the interlocking gear 13 is the longest, and the rotational speed of the damper gear 15a of the damper member 15 is the fastest.

  For this reason, the rotational torque of the damper gear 15a by the damper member 15 becomes the largest, and accordingly, the force for closing the keyboard lid 8 becomes heaviest, and the keyboard lid 8 rotates slowly and closes. As a result, when the keyboard cover 8 is completely closed, the keyboard cover 8 does not rotate suddenly as in the first embodiment. Therefore, there is a risk that the user may injure his / her hand or finger by the keyboard cover 8. The keyboard lid 8 can be safely closed with little possibility. When the keyboard cover 8 is opened from the closed state, the keyboard cover 8 can be opened by performing an operation reverse to the above-described operation.

  As described above, in the lid opening / closing device 20 of the keyboard lid 8 as well, the interlocking gear 13 that rotates together with the keyboard lid 8 around the support shaft 12 that rotatably attaches the keyboard lid 8 to the musical instrument case 1 is provided. The support shaft 12 is supported at a position eccentric from the center Q of the pitch circle P of the tooth portion, and the distance from the support shaft 12 to the tooth portion 13a is shortened when the keyboard cover 8 is in the middle of closing. Since the distance from the support shaft 12 to the tooth portion 13a is gradually increased when 8 is completely closed, the keyboard lid 8 can be opened and closed easily, and the keyboard lid 8 can be opened and closed safely. it can.

  In this case, a link member 21 that swings in the contact / separation direction with respect to the interlocking gear 13 is rotatably attached to the attachment member 14 by an attachment shaft 22, and the damper member 15 is attached to the link member 21. The damper gear 15a of the damper member 15 can be favorably moved along a straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 13 and the center of the damper gear 15a of the damper member 15. The teeth 13a of the interlocking gear 13 and the damper gear 15a can be meshed reliably and satisfactorily.

  That is, the position of the support shaft 12 that is the center of rotation of the interlocking gear 13 is shifted from the center Q of the pitch circle P by the distance S along the centerline L of the interlocking gear 13. Even if the meshing position of the damper member 15 with the damper gear 15a moves along the center line L, the link member 21 is attached when the damper member 15 is pushed toward the interlocking gear 13 by the spring force of the spring member 16. By rotating around the shaft 22, the teeth 13 a of the interlocking gear 13 and the damper gear 15 a can be meshed reliably and satisfactorily.

  In the first and second embodiments described above, the position of the support shaft 12 that is the rotation center of the substantially fan-shaped interlocking gear 13 is biased toward the tooth portion 13a by a distance S along the substantially center line L of the fan shape. However, the present invention is not limited to this. For example, the position of the support shaft 12 does not necessarily have to be deviated along the substantially fan-shaped center line L, and the lower side of the substantially fan-shaped interlocking gear 13. A configuration may be adopted in which the distance S is biased toward the tooth portion 13a located at the position. If comprised in this way, when closing the keyboard cover 8, the distance from the support shaft 12 to the tooth | gear part 13a can be lengthened gradually, and, thereby, the operation | movement which closes the keyboard cover 8 can be made slow gradually. .

(Embodiment 3)
Next, a third embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. Also in this case, the same portions as those in the first embodiment shown in FIGS.
As shown in FIGS. 12 to 14, the keyboard instrument has a configuration in which the interlocking gear 31 of the lid opening / closing device 30 is different from that of the first embodiment, and the configuration other than this is substantially the same as that of the first embodiment.

  That is, as shown in FIG. 14, the interlocking gear 31 of the lid opening / closing device 30 is formed in a substantially fan shape consisting entirely of a spiral part, and a tooth part 31a is formed along the spiral outer periphery. It has been configured. In this case, as shown in FIG. 14, the interlocking gear 31 is supported by the support shaft 12 at a position eccentric from the center Q1 of the spiral pitch circle P1 of the tooth portion 31a toward the tooth portion 31a located on the small diameter side. Has been.

  Specifically, as shown in FIG. 14, the interlocking gear 31 has a substantially fan shape with an opening angle of approximately 130 degrees as a whole, and is spirally formed by a distance S along the center line L of the substantially fan shape. The position of the support shaft 12 is shifted from the center Q1 of the pitch circle P1. For this reason, as shown in FIG. 14, in the interlocking gear 31, the distance from the tooth portion 31a located on the substantially fan-shaped upper side to the support shaft 12 is gradually shortened from the tooth portion 31a located on the lower side. It is comprised so that it may become.

  As a result, when the keyboard cover 8 is in an open state, the interlocking gear 31 has a tooth portion 31a located on the substantially fan-shaped lower side meshing with the damper gear 15a of the damper member 15, and the teeth located on the lower side. Since the distance from the portion 31a to the support shaft 12 is the shortest, when the rotational speed of the interlocking gear 31 is constant, the damper gear 15a is rotated at the slowest rotational speed to weaken the braking force by the damper member 15 most. It is configured as follows.

  Further, when the interlocking gear 31 is closed from the opened state of the keyboard cover 8, the tooth portion 31a that meshes with the damper gear 15a of the damper member 15 has an upper side from the tooth portion 31a that is positioned on the lower side of the substantially fan shape. When the rotational speed of the interlocking gear 31 is kept constant by moving the toothed part 31a located at a distance from the support shaft 12 to the toothed part 31a gradually, the rotational speed of the damper gear 15a is gradually increased. And the braking force by the damper member 15 is gradually increased.

Next, the operation of the lid opening / closing device 30 of the keyboard lid 8 will be described.
Also in this case, when closing the keyboard lid 8, as shown in FIG. 15, the tip end portion (upper end portion in FIG. 15) of the keyboard lid 8 is pulled toward the front side and tilted. At this time, as shown in FIG. 15, the tooth portion 31 a located on the lower side of the interlocking gear 31 meshes with the damper gear 15 a of the damper member 15. Thereby, on the straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 31 and the center of the damper gear 15 a of the damper member 15, the tooth portion of the interlocking gear 31 from the support shaft 12 that is the rotation center of the interlocking gear 31. The distance to 31a is short.

  For this reason, as shown in FIG. 15, the damper member 15 is pushed toward the interlocking gear 31 by the spring force of the spring member 16, and the damper gear 15 a of the damper member 15 meshes with the tooth portion 31 a of the interlocking gear 31. In this state, when the front end portion (upper end portion in FIG. 15) of the keyboard lid 8 is pulled down to close the keyboard lid 8, the keyboard lid 8 rotates counterclockwise around the support shaft 12 of the arm member 11, and the arm member 11 also rotates together with the keyboard lid 8 counterclockwise around the support shaft 12. Along with this, the damper gear 15a of the damper member 15 is engaged with the tooth portion 31a of the interlocking gear 31 and rotates.

  At this time, since the load is applied to the interlocking gear 31 by the damper member 15, the rotation of the interlocking gear 31 is braked, so that the keyboard lid 8 does not rotate rapidly in the closing direction. Further, at this time, on the straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 31 and the center of the damper gear 15a of the damper member 15, the support shaft 12 that is the rotation center of the interlocking gear 31 and the support gear 12 The distance to the tooth portion 31a is gradually increased. For this reason, the damper member 15 is pushed to the opposite side to the interlocking gear 31 against the spring force of the spring member 16.

  Also at this time, the damper gear 15a always meshes with the tooth portion 31a of the interlocking gear 31 and rotates, and the rotational speed of the damper gear 15a gradually increases. Thereby, like Embodiment 1, the rotational torque of the damper gear 15a by the damper member 15 becomes large gradually, and the load with respect to the interlocking gear 31 becomes large gradually. For this reason, the force for closing the keyboard lid 8 gradually increases and the speed for closing the keyboard lid 8 gradually decreases.

  As shown in FIGS. 12 and 13, when the keyboard cover 8 is completely closed, a straight line connecting the support shaft 12 that is the rotation center of the interlocking gear 31 and the center of the damper gear 15a of the damper member 15 is used. , The distance from the support shaft 12 that is the center of rotation of the interlocking gear 31 to the tooth portion 31a of the interlocking gear 31 is the longest, and the rotational speed of the damper gear 15a of the damper member 15 is the fastest.

  For this reason, the rotational torque of the damper gear 15a by the damper member 15 becomes the largest, and accordingly, the force for closing the keyboard lid 8 becomes heaviest, and the keyboard lid 8 rotates slowly and closes. As a result, when the keyboard cover 8 is completely closed, the keyboard cover 8 does not rotate suddenly as in the first embodiment. Therefore, there is a risk that the user may injure his / her hand or finger by the keyboard cover 8. The keyboard lid 8 can be safely closed with little possibility. When the keyboard cover 8 is opened from the closed state, the keyboard cover 8 can be opened by performing an operation reverse to the above-described operation.

  As described above, in the lid opening / closing device 30 of the keyboard lid 8 as well, the interlocking gear 31 that rotates together with the keyboard lid 8 around the support shaft 12 that rotatably attaches the keyboard lid 8 to the musical instrument case 1 is provided. The tooth portion 31a is supported on the support shaft 12 at a position eccentric from the center Q1 of the pitch circle P1, and when the keyboard cover 8 is in the middle of closing, the distance from the support shaft 12 to the tooth portion 31a is shortened. Since the distance from the support shaft 12 to the tooth portion 31a is gradually increased when the cover 8 is completely closed, the keyboard cover 8 can be opened and closed easily and the keyboard cover 8 can be opened and closed safely. Can do.

  That is, in the lid opening / closing device 30 of the keyboard lid 8, when the keyboard lid 8 is closed, the damper member 15 can brake the rotational operation of the keyboard lid 8, and when the keyboard lid 8 is closed from the opened state. By gradually increasing the braking force of the damper member 15 against the keyboard lid 8, the force for closing the keyboard lid 8 is gradually increased, and the keyboard lid 8 can be rotated slowly. For this reason, the opening / closing operability of the keyboard lid 8 is good, and the keyboard lid 8 can be safely closed without causing injury by pinching the hand or fingers with the keyboard lid 8.

  In this case, the interlocking gear 31 is formed in a substantially fan shape composed of a part of a spiral shape, and the position offset from the center Q1 of the pitch circle P1 toward the tooth portion 31a located on the small diameter side is supported by the support shaft 12. Thus, the distance from the tooth portion 31a to the support shaft 12 can be varied according to the opening / closing operation of the keyboard lid 8. That is, the interlocking gear 31 has a fan shape with an opening angle of approximately 130 degrees as a whole, and the position of the support shaft 12 is shifted from the center Q1 of the pitch circle P1 by a distance S along the center line L. The distance from the tooth part 31a located below the center line L to the tooth part 31a located above the center line L can be gradually increased.

  For this reason, when the keyboard lid 8 is closed, the interlocking gear 31 gradually increases the rotational speed of the damper gear 15a of the damper member 15 from the beginning to the end of the closing, so that the damper member with respect to the keyboard lid 8 is The braking force of 15 can be gradually increased. As a result, the force to close the keyboard lid 8 is gradually increased, and the closing operation of the keyboard lid 8 can be gradually slowed down, so that the keyboard lid 8 can be opened and closed easily. The keyboard lid 8 can be safely closed without being injured.

  In the first to third embodiments described above, the case where the spring member 16 made of a coil spring is used as the urging member for urging the damper member toward the interlocking gears 13 and 31 is not limited thereto. The spring member 16 may be a leaf spring, and is not limited to a spring member, and may be an elastic member such as rubber.

  In the first to third embodiments described above, the case where the present invention is applied to the keyboard lid 8 of a keyboard musical instrument has been described. However, the keyboard lid 8 of the keyboard musical instrument is not necessarily required, and for example, lids of various electronic devices such as acoustic devices. It can be widely applied to the body.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 6 Keyboard part 8 Keyboard lid | cover 10, 20, 30 Lid opening / closing device 11 Arm member 12 Support shaft 13, 31 Interlocking gear 13a, 31a Interlocking gear tooth | gear part 14 Mounting member 15 Damper member 15a Damper gear 16 Spring member P, P1 Pitch circle Q, Q1 Center of pitch circle S Distance from center of pitch circle to support shaft L Center line of interlocking gear

Claims (4)

A case, a lid rotatably attached to the case by a support shaft, an interlocking gear that rotates together with the lid around the support shaft, and a damper gear that meshes with the interlocking gear and rotates. In the lid opening and closing device provided with a damper member for braking the rotation of the interlocking gear,
A lower end is rotatably attached to the case and the damper member is attached to the upper part, and the damper gear has a link member that guides the damper gear so that it can swing in the contact and separation direction.
The interlocking gear is supported by the support shaft at a position eccentric from the center of the pitch circle of the tooth portion, and when the keyboard cover is in the middle of closing, the distance from the support shaft to the tooth portion is short, and the keyboard The lid opening / closing device, wherein the distance from the support shaft to the tooth portion is gradually increased when the lid is in a closed state.   The interlocking gear is formed in a substantially fan shape composed of a part of a circular shape, and a position that is biased from the center of the pitch circle of the tooth portion toward the tooth portion located in the middle of the substantially fan shape is the support. The lid opening / closing device according to claim 1, wherein the lid opening / closing device is supported by a shaft.   The interlocking gear is formed in a substantially fan shape composed of a spiral part, and the pitch circle of the tooth part forms a spiral shape, and the tooth part located on the small diameter side from the center of the spiral pitch circle. The lid opening / closing apparatus according to claim 1, wherein a position biased toward the center is supported by the support shaft.   The urging member for elastically pressing and engaging the damper gear of the damper member to the tooth portion of the interlocking gear is provided. Lid opening / closing device.

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