JP2012078713A - Cover opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover opening/closing device which is capable of stabilizing an opening/closing operation of a cover body to satisfactorily damp the cover body by reducing a shake of a gear shaft even in the case of application of a large load to a damper gear in a radial direction.SOLUTION: The cover opening/closing device includes: an instrument case 1; a keyboard cover 8 rotatably attached to the instrument case 1 by a support shaft 12; an interlocking gear 13 rotated around the support shaft 12 together with the keyboard cover 8; and a damper member 14 which has a gear shaft 15 to which a damper gear 17 rotated in engagement with the interlocking gear 13 is attached, and damps rotation of the interlocking gear 13. At least an outer end part being a free end projecting to the outside of the damper member 14 out of both end parts of the gear shaft 15 of the damper member 14 is rotatably supported by a shaft support member 16, whereby a shake of the gear shaft 15 can be reduced even in the case of application of a large load to the damper gear 17 in a radial direction when the damper gear 17 is rotated in engagement with the interlocking gear 13 rotated in accordance with the opening/closing operation of the keyboard cover 8.

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, and an interlocking gear that rotates around the support shaft is provided on the lid, 2. Description of the Related Art There is known a configuration in which a damper member having a damper gear that meshes with a gear and rotates is attached along the outer periphery of an interlocking gear.

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 interlocking gear 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 / closing device, the gear shaft to which the damper gear is attached is supported by the damper member in a cantilever state, and the tip end portion of the gear shaft protruding outside the damper member is in a free state. Since the damper gear is attached to the tip of the gear shaft in the free state, when a large radial load is applied to the damper gear by the lid when the interlocking gear meshes with the damper gear and rotates, the gear shaft Since the leading end portion causes center wobbling, the opening / closing operation of the lid body becomes unstable, and there is a problem that the opening / closing operation of the lid body cannot be stabilized and braked satisfactorily.

  The problem to be solved by the present invention is that a lid that can reduce the runout of the gear shaft and stabilize the opening and closing operation of the lid body and perform good braking even when a large radial load is applied to the damper gear. It is to provide a switchgear.

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 having a gear shaft to which a rotating damper gear is attached and braking the rotation of the interlocking gear, and at least the damper member among both end portions of the gear shaft in the damper member A lid opening / closing device comprising: a shaft support member that rotatably supports a free end protruding to the outside.

  The invention according to claim 2 is the other end portion of the gear shaft in which the shaft support member is provided in the interlocking gear that rotates together with the lid, and one end portion is rotatably supported by the damper member. The lid opening / closing device according to claim 1, wherein the free end is rotatably supported.

  The invention according to claim 3 is characterized in that the shaft support member has a guide groove that relatively moves the free end of the gear shaft according to the rotation of the interlocking gear. 2. The lid opening / closing device according to 2.

  According to a fourth aspect of the present invention, in the lid opening / closing device according to the third aspect, the guide groove is formed in an arc shape centering on the support shaft that is the rotation center of the interlocking gear. It is.

  The invention according to claim 5 is the other end portion of the gear shaft, wherein the shaft support member is fixed to the case together with the damper member, and one end portion is rotatably supported by the damper member. 2. The lid opening / closing device according to claim 1, wherein the free end is rotatably supported.

  The invention according to claim 6 is characterized in that the shaft support member is fixed to the case and rotatably supports both end portions which are free ends of the gear shaft protruding to the outside of the damper member. The lid opening / closing device according to claim 1.

  According to this invention, when the damper gear meshes with the interlocking gear accompanying the opening / closing operation of the lid and rotates, the shaft support member rotatably supports the free end of the gear shaft protruding to the outside of the damper member. The gear shaft can be rotated well together with the damper gear. For this reason, even if a large radial load is applied to the damper gear, the shaft support member can reduce the runout of the gear shaft, thereby stabilizing the opening and closing operation of the lid, and the damper member. The opening / closing operation of the lid can be satisfactorily braked.

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. It is an expanded sectional view in the AA arrow of the lid | cover opening / closing apparatus shown by FIG. It is the enlarged front view which showed the principal part in the lid | cover opening / closing apparatus shown by FIG. FIG. 5 is an enlarged front view showing the interlocking gear and the shaft support member in the lid opening / closing device shown in FIG. 4 in an exploded manner. The damper member in the lid | cover opening / closing apparatus shown by FIG. 2 is shown, (a) is the enlarged front view, (b) is the enlarged side view. 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. 8 is a cross-sectional view showing a state in which a keyboard lid is completely opened in the keyboard instrument shown in FIG. 7. It is the expanded sectional view of the principal part which showed Embodiment 2 which applied this invention to the keyboard musical instrument. It is an expanded sectional view in the BB arrow of the lid | cover opening / closing apparatus shown by FIG. The damper member and shaft support member in the lid | cover opening / closing apparatus shown by FIG. 10 are shown, (a) is the enlarged front view, (b) is the expanded sectional view in the CC arrow. It is the expanded sectional view which showed the principal part of the lid | cover opening / closing apparatus in Embodiment 3 which applied this invention to the keyboard musical instrument. The damper member in the lid | cover opening / closing apparatus shown by FIG. 12 is shown, (a) is the enlarged front view, (b) is the expanded sectional view in the DD arrow. It is an expanded sectional view in the EE arrow of the lid opening / closing device shown in FIG.

(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 includes a pair of side plates 2 that also serve as legs, a bottom plate 3 that is a shelf plate 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. There are provided a front plate 4 provided upright and a rear plate 5 provided upright on a rear end portion (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 FIGS. 1 and 2, a keyboard lid 8 that covers the keyboard portion 6 so as to be opened and closed is provided at the upper portion of the musical instrument case 1 so as to be opened and closed by a lid opening / closing device 10. The keyboard lid 8 is rotated in the vertical direction by the lid opening / closing device 10 so that when the musical instrument case 1 is closed, the keyboard lid 8 is arranged on the upper part of the musical instrument case 1 so as to cover and hide the keyboard portion 6, as shown in FIG. When the instrument case 1 is opened, the instrument case 1 is stood up slightly behind the instrument case 1 (right side in FIG. 8) so that the keyboard 6 is exposed above the instrument case 1.

  As shown in FIGS. 1 to 3, 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 rotatably attached to the arm member 11, an interlocking gear 13 which is attached to the arm member 11 and rotates around the support shaft 12 together with the keyboard lid 8, and a keyboard attached to the inner surface of the side plate 2 of the musical instrument case 1. A damper member 14 that brakes the opening / closing operation of the lid 8 and a shaft support member 16 that supports an outer end portion 15a that is a free end of the gear shaft 15 of the damper member 14 are provided.

  Thereby, 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. In this case, as shown in FIG. 2, the arm member 11 is attached to the rear portion (right side portion in FIG. 2) on the lower surface of the keyboard lid 8 and is configured to be inserted into the rear portion in the musical instrument case 1 from above. Yes.

  As shown in FIGS. 1 to 3, the support shaft 12 protrudes toward the inside of the musical instrument case 1 at a position located at the rear portion (right side portion in FIG. 2) of the pair of side plates 2 of the musical instrument case 1. It is attached. As shown in FIG. 3, the support shaft 12 is configured such that the lower portion of the arm member 11 inserted into the musical instrument case 1 is rotatably attached, whereby the arm member 11 rotates together with the keyboard cover 8. Yes.

  As shown in FIGS. 1 to 3, the interlocking gear 13 is configured to transmit the opening / closing operation of the keyboard lid 8 to the damper member 14 when the arm member 11 rotates together with the keyboard lid 8 around the support shaft 12. Has been. That is, as shown in FIGS. 2 to 4, the interlocking gear 13 is generally formed in a fan shape, and is provided with a tooth portion 13 a on the outer peripheral surface thereof. Therefore, it is configured to rotate together with the arm member 11 around the support shaft 12.

  As shown in FIGS. 1 to 3, the damper member 14 is a rotary damper, and includes a damper gear 17 that meshes with the interlocking gear 13, and a gear shaft 15 that is attached to the damper gear 17 and rotates together with the damper gear 17. ing. That is, as shown in FIGS. 6 (a) and 6 (b), the damper member 14 is provided with a gear shaft 15 rotatably provided in a housing 14a. It is configured to have a braking function for braking the rotation of the damper gear 17 by applying a load by (not shown).

  In this case, as shown in FIG. 4, in the damper member 14, the end portion of the gear shaft 15 protrudes from the inside of the housing 14 a to the outside, and a damper gear 17 is attached to the protruding gear shaft 15, together with the gear shaft 15. It is configured to rotate. As shown in FIG. 3, the damper member 14 has a housing 14 a attached to the inner surface of the side plate 2 of the musical instrument case 1 with screws 18.

  As shown in FIGS. 3 and 4, the damper gear 17 is configured to mesh with the tooth portion 13 a of the interlocking gear 13 and rotate around the gear shaft 15. In this case, the gear shaft 15 is configured in a cantilever state in which an inner end portion 15b which is one end portion located in the housing 14a is rotatably supported in the housing 14a. Thereby, when the keyboard cover 8 rotates about the support shaft 12 and opens and closes, the damper member 14 rotates the interlock gear 13 about the support shaft 12, so that the damper gear 17 rotates the teeth of the interlock gear 13. It is configured to mesh with the portion 13a and rotate.

  As shown in FIGS. 3 to 5, the shaft support member 16 is rotatably attached to the outer end 15 a that is a free end of the gear shaft 15 that is attached to the interlocking gear 13 and protrudes to the outside of the damper member 14. Is configured to do. That is, as shown in FIGS. 3 to 5, the shaft support member 16 is formed in a substantially arc-shaped flat plate shape, and a pair of mounting projections 16 a provided at both ends thereof are provided on one surface of the interlocking gear 13, that is, The gear shaft 15 is attached by screws 19 to the inner surface (the right side surface in FIG. 3) where the outer end portion 15a is located.

  In this case, as shown in FIG. 3, the mounting protrusion 16 a is away from the inner surface (the right side surface in FIG. 3) of the interlocking gear 13 so that the shaft support member 16 does not contact the damper gear 17 of the damper member 14. It is bent in a staircase shape. Further, as shown in FIGS. 4 and 5, the shaft support member 16 is interlocked with a guide groove 20 that rotatably supports and guides an outer end portion 15 a that is a free end of the gear shaft 15 of the damper member 14. It is provided along the tooth portion 13 a of the gear 13.

  That is, as shown in FIGS. 3 to 5, the guide groove 20 has a rotational center of the interlocking gear 13 at a position away from the tooth portion 13 a of the interlocking gear 13 by the radial distance of the damper gear 17 toward the outer peripheral side. It is formed in the circular arc shape centering on the support shaft 12 which is. In this case, the guide groove 20 has a length in the arc direction substantially the same as that of the tooth portion 13 a of the interlocking gear 13. Further, the guide groove 20 is formed so that the groove width is substantially the same as that of the gear shaft 15 of the damper gear 17.

  As a result, as shown in FIGS. 3 and 4, the damper gear 17 protrudes outside the housing 14 a in a state where the inner end portion 15 b of the gear shaft 15 is rotatably supported in the housing 14 a of the damper member 14. The outer end 15a, which is the free end of the other end of the gear shaft 15, is movably inserted into the guide groove 20 of the shaft support member 16. In this state, the outer end 15a of the gear shaft 15 is connected to the keyboard lid 8. It is configured to move relatively while rotating in the guide groove 20 in accordance with the opening / closing operation.

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. 8, the tip end portion (upper end portion in FIG. 8) of the keyboard lid 8 is drawn toward the front side (left side in FIG. 8). Then, as shown in FIG. 7, the keyboard cover 8 rotates counterclockwise around the support shaft 12 of the arm member 11, and the interlocking gear 13 provided on the arm member 11 also moves the support shaft 12 together with the keyboard cover 8. Rotates counterclockwise about the center.

  At this time, since the tooth portion 13 a of the interlocking gear 13 is engaged with the damper gear 17 of the damper member 14, the damper gear 17 of the damper member 14 rotates together with the gear shaft 15 in the clockwise direction as the interlocking gear 13 rotates. When the damper gear 17 rotates in this way, a load is applied to the interlocking gear 13 by the damper member 14 so that the rotation of the interlocking gear 13 is braked. For this reason, the keyboard cover 8 does not rotate rapidly in the closing direction, but rotates slowly.

  Further, when the damper gear 17 rotates together with the gear shaft 15 as described above, the outer end portion 15a of the gear shaft 15 is supported by the shaft support member 16 attached to the interlocking gear 13, as shown in FIG. The shaft support member 16 relatively moves in the guide groove 20. That is, when the damper gear 17 rotates while meshing with the teeth 13 a of the interlocking gear 13, the shaft support member 16 rotates around the support shaft 12 as the interlocking gear 13 rotates, whereby the shaft support member 16. The guide groove 20 rotates counterclockwise from the upper side to the lower side.

  At this time, the gear shaft 15 is fixed to the musical instrument case 1 with its inner end 15b rotatably supported by the damper member 14. For this reason, as shown in FIGS. 7 and 8, the gear shaft 15 does not move, and the outer end portion 15 a that is the free end of the gear shaft 15 projecting outward from the damper member 14 is a guide groove of the shaft support member 16. The guide groove 20 moves relatively from the lower side toward the upper side while being supported in the inner side.

  Thereby, the gear shaft 15 of the damper gear 17 is rotatably supported by the damper member 14 at the inner end portion 15b as one end portion thereof, and the outer end portion 15a as the free end at the other end portion is supported by the shaft support member 16. Since it is supported so as to be able to rotate and rotates together with the damper gear 17 in this state, even when a large radial load is applied to the damper gear 17 when the keyboard cover 8 is closed, the runout of the gear shaft 15 is reduced. . Therefore, the opening / closing operation of the keyboard lid 8 is stabilized, and the opening / closing operation of the keyboard lid 8 is satisfactorily braked by the damper member 14.

  When the keyboard cover 8 is further rotated and opened, the arm member 11 is further rotated counterclockwise around the support shaft 12 as shown in FIGS. 1 and 2, and accordingly, the interlocking gear 13 and the shaft are rotated. The support member 16 rotates counterclockwise about the support shaft 12. As a result, the damper gear 17 of the damper member 14 rotates about the gear shaft 15, so that a load is applied to the interlocking gear 13 by the damper member 14, the rotation of the interlocking gear 13 is braked, and the keyboard lid 8 is closed. The movement to is braked.

  At this time, the gear shaft 15 does not move, and the guide groove 20 rotates from the upper side to the lower side as the shaft support member 16 rotates counterclockwise. In a state where the portion 15a is supported in the guide groove 20 of the shaft support member 16 together with the interlocking gear 13, the guide groove 20 relatively moves from the lower side to the upper side, as shown in FIGS. , Located at the upper end of the guide groove 20. As a result, the keyboard cover 8 does not close suddenly, but is slowly arranged on the upper part of the musical instrument case 1 to satisfactorily cover the keyboard part 6.

  Further, when opening the closed keyboard lid 8 in this way, the lid opening / closing device 10 performs an operation reverse to the above-described operation, so that the keyboard lid 8 is slightly behind the instrument case 1 as shown in FIG. Stand up in a tilted state. At this time, the arm member 11 rotates clockwise around the support shaft 12, and accordingly, the interlocking gear 13 and the shaft support member 16 rotate clockwise around the support shaft 12.

  As a result, the damper gear 17 of the damper member 14 rotates counterclockwise around the gear shaft 15, so that a load is applied to the interlocking gear 13 by the damper member 14, and the rotation of the interlocking gear 13 is braked and the keyboard cover The movement of 8 in the opening direction is braked. For this reason, the keyboard lid 8 rotates slowly in the opening direction.

  Also at this time, the gear shaft 15 does not move, but the guide groove 20 rotates as the shaft support member 16 rotates, so that the outer end which is the free end of the gear shaft 15 protruding from the damper member 14 to the outside. In a state where the portion 15a is supported in the guide groove 20 of the shaft support member 16 together with the interlocking gear 13, the inside of the guide groove 20 moves relatively from the upper side to the lower side, as shown in FIGS. , Located at the lower end of the guide groove 20. As a result, the keyboard lid 8 stands up slightly behind the instrument case 1 and opens the keyboard portion 6.

  Thus, according to the lid opening / closing device 10 for the keyboard lid 8, the musical instrument case 1, the keyboard lid 8 rotatably attached to the musical instrument case 1 by the support shaft 12, and the keyboard lid with the support shaft 12 as the center. An interlocking gear 13 that rotates together with the interlocking gear 8, and a damper member 14 that has a gear shaft 15 to which a damper gear 17 that rotates in mesh with the interlocking gear 13 is mounted and brakes the rotation of the interlocking gear 13. 14, the outer end portion 15 a that is a free end protruding outside the damper member 14 is rotatably supported by the shaft support member 16, so that the damper gear 17 has a large radial direction. Even if a load is applied, the runout of the gear shaft 15 can be reduced.

  In other words, in the lid opening / closing device 10 of the keyboard lid 8, when the damper gear 17 is engaged with the interlocking gear 13 and rotated when the keyboard lid 8 is opened / closed, the outer shaft which is the free end of the gear shaft 15 is rotated by the shaft support member 16. Since the end portion 15a is rotatably supported, the runout of the gear shaft 15 can be reduced even when a large radial load is applied to the damper gear 17. For this reason, since the damper gear 17 can be rotated favorably by the gear shaft 15, the opening / closing operation of the keyboard lid 8 can be stabilized, and the opening / closing operation of the keyboard lid 8 can be satisfactorily braked by the damper member 14. Can do. Thereby, when opening and closing the keyboard cover 8, the keyboard cover 8 can be opened and closed safely.

  In this case, the shaft support member 16 is provided on the interlocking gear 13 that rotates together with the keyboard lid 8, and is the other end that is the free end of the gear shaft 15 that is rotatably supported by the damper member 14 at the inner end portion 15 b. Since the outer end portion 15a of the end portion is rotatably supported, the interlocking gear 13 rotates around the support shaft 12 together with the keyboard lid 8 in a state where the damper gear 17 is engaged with the tooth portion 13a of the interlocking gear 13. At this time, even if a large radial load is applied to the damper gear 17, the shaft support member 16 can satisfactorily reduce the runout of the gear shaft 15, thereby stabilizing and reliably opening and closing the keyboard lid 8. Moreover, it can brake well.

  Further, the shaft support member 16 has a guide groove 20 in which an outer end portion 15a which is a free end of the gear shaft 15 relatively moves in accordance with the rotation of the interlocking gear 13, so that the damper gear 17 is When rotating while meshing with the tooth portion 13a of the interlocking gear 13, even if the shaft support member 16 rotates about the support shaft 12 as the interlocking gear 13 rotates, the outer end portion 15a of the gear shaft 15 is axially supported. Even when a large radial load is applied to the damper gear 17 when the keyboard cover 8 is opened and closed, the shaft 16 can be moved in a state where it is rotatably supported in the guide groove 20 of the member 16. The support member 16 can reduce the runout of the gear shaft 15.

  Further, the guide groove 20 is formed in an arc shape centering on the support shaft 12 which is the rotation center of the interlocking gear 13, so that the damper gear 17 is engaged with the tooth portion 13 a of the interlocking gear 13 and rotates. Even if the shaft support member 16 rotates around the support shaft 12 as the interlocking gear 13 rotates, the outer end portion 15a of the gear shaft 15 is always supported in a constant state by the guide groove 20 of the shaft support member 16. can do.

  As a result, even when a large radial load is applied to the damper gear 17 when the keyboard lid 8 is opened and closed, the runout of the gear shaft 15 can be satisfactorily reduced by the guide groove 20 of the shaft support member 16. The opening / closing operation of the keyboard lid 8 can be stabilized, and the opening / closing operation of the keyboard lid 8 can be satisfactorily braked by the damper member 14.

  In the first embodiment described above, the damper member 14 is arranged in parallel to the side of the interlocking gear 13, that is, in a substantially horizontal direction with respect to the support shaft 12. Although the case where the tooth portion 13a of the gear 13 and the damper gear 17 of the damper member 14 are meshed with each other has been described, the present invention is not limited to this. For example, the damper member 14 is disposed below the interlocking gear 13, that is, on the support shaft 12. Alternatively, it may be arranged in a column in a substantially vertical direction.

  If comprised in this way, the tooth | gear part 13a of the interlocking gear 13 and the damper gear 17 of the damper member 14 can be meshed | engaged in the substantially horizontal tangent direction with respect to the interlocking gear 13. FIG. For this reason, even if a large radial load is applied to the damper gear 17 by the keyboard lid 8, the runout of the gear shaft 15 is more reliably reduced by the guide groove 20 of the shaft support member 16 than in the first embodiment. can do.

(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 FIGS. 9 and 10, the keyboard instrument has a configuration that is different from that of the first embodiment in the shaft support member 31 of the lid opening / closing device 30, and has substantially the same configuration as that of the first embodiment.

  As shown in FIGS. 9 and 10, the shaft support member 31 is fixed to the inner surface of the side plate 2 of the musical instrument case 1 and is an outer end that is a free end of the gear shaft 15 protruding outside the damper member 14. It is comprised so that the part 15a may be supported rotatably. In this case, the shaft support member 31 is made of a metal plate and is configured to be bent stepwise as shown in FIGS. 10 and 11.

  That is, as shown in FIGS. 11 (a) and 11 (b), the shaft support member 31 includes an attachment piece 31a attached to the side plate 2 of the musical instrument case 1 by screws 33, and an end portion of the attachment piece 31a. It has an upright piece 31b that rises upward from the damper member 14 and a support piece 31c that extends from the upper end of the upright piece 31b along the upper side of the damper member 14 and is bent in a stepped manner. It has become.

  In this case, as shown in FIGS. 11A and 11B, the support piece 31c rotatably supports an outer end portion 15a which is a free end of the gear shaft 15 protruding to the outside of the damper member 14. A bearing hole 32 is provided. As a result, the gear shaft 15 of the damper member 14 has an inner end 15b that is one end thereof rotatably supported in the housing 14a of the damper member 14, and an outer end 15a that is the free end of the other end is an instrument. It is configured to be rotatably supported by a shaft support member 31 fixed to the side plate 2 of the case 1.

  According to the lid opening / closing device 30 of the keyboard lid 8 as described above, the shaft support member 31 is the other end that is the free end of the gear shaft 15 that is rotatably supported by the damper member 14 at the inner end portion 15b. Since the outer end portion 15a is rotatably supported, even if a large radial load is applied to the damper gear 17 in the same manner as in the first embodiment, the gear shaft 15 is prevented from running out and the keyboard lid 8 The opening / closing operation can be stabilized, and the damper member 14 can satisfactorily brake the opening / closing operation of the keyboard lid 8.

  That is, in the lid opening / closing device 30, when the damper gear 17 meshes with the interlocking gear 13 associated with the opening / closing operation of the keyboard lid 8 and rotates, the inner end 15 b that is one end of the gear shaft 15 is caused by the damper member 14. Since the outer end 15a, which is the free end of the other end of the gear shaft 15, is rotatably supported by the shaft support member 32, the damper gear 17 is subjected to a large radial load. Thus, the runout of the gear shaft 15 can be reliably prevented.

  For this reason, since the damper gear 17 can be rotated reliably and satisfactorily by the gear shaft 15, the opening / closing operation of the keyboard lid 8 can be stabilized, and the opening / closing operation of the keyboard lid 8 can be satisfactorily performed by the damper member 14. Can be braked. Thereby, when opening and closing the keyboard cover 8, the keyboard cover 8 can be opened and closed safely.

  In this case, the shaft support member 31 rotatably supports the outer end portion 15a, which is the free end of the gear shaft 15, in a state of being fixed to the side plate 2 of the musical instrument case 1. The outer end portion 15a that is the free end of the shaft 15 can be reliably supported, and thereby the center deflection of the gear shaft 15 can be reliably prevented.

  For this reason, when the interlocking gear 13 rotates about the support shaft 12 together with the keyboard cover 8, the damper gear 17 is securely and satisfactorily engaged with the teeth 13a of the interlocking gear 13, and the keyboard cover 8 is opened and closed. Accordingly, the rotation of the interlocking gear 13 can be reliably transmitted to the damper gear 17, and the opening / closing operation of the keyboard lid 8 can be reliably and satisfactorily braked in a more stable state than in the first embodiment.

  In the second embodiment, the case where the shaft support member 31 is directly attached to the side plate 2 of the musical instrument case 1 has been described. However, the present invention is not limited to this. For example, the shaft support member 31 is attached to the damper member 14 in this state. The damper member 14 may be configured to be attached to the side plate 2 of the musical instrument case 1 together with the shaft support member 31. Even if comprised in this way, there exists an effect similar to Embodiment 2, and the improvement of assembly workability | operativity can be aimed at.

(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 parts as those in the first embodiment shown in FIGS.
As shown in FIG. 12, the keyboard instrument has a configuration in which a damper member 36 and a shaft support member 37 of a lid opening / closing device 35 are different from those in the first embodiment, and the other configurations are substantially the same as those in the first embodiment.

  The damper member 36 is a rotary damper as shown in FIGS. 12 to 14. The damper gear 17 meshes with the teeth 13 a of the interlocking gear 13 and rotates. The damper gear 17 is attached to the damper member 17 together with the damper gear 17. A rotating gear shaft 38 and a pair of housings 36a for housing the gear shaft 38 are provided. The damper member 36 is configured to brake the rotation of the damper gear 17 by applying a load to the gear shaft 38 by a friction member (not shown) such as a spring or an elastic member.

  In this case, the damper gear 17 is provided integrally with the gear shaft 38 as shown in FIGS. The damper gear 17 is configured such that a part of its outer peripheral portion protrudes to the outside from the pair of housings 36 a, and the protruding portion meshes with the tooth portion 13 a of the interlocking gear 13 and rotates. Further, the pair of housings 36 a is configured such that a protruding portion 36 c protruding to the outer peripheral side of the damper gear 17 is attached to the shaft support member 37 by a screw member 45 described later.

  As shown in FIGS. 12 to 14, the pair of housings 36 a are respectively provided with shaft insertion holes 36 b into which both end portions 38 a that are free ends of the gear shaft 38 protruding outside the damper member 36 are inserted. . In addition, a mounting hole 36d into which the screw member 45 is inserted is provided in the protruding portion 36c protruding to the outer peripheral side of the damper gear 17 in the pair of housings 36a.

  On the other hand, the shaft support member 37 is configured to be fixed to the instrument case 1 together with the damper member 36, as shown in FIGS. That is, as shown in FIGS. 12 and 14, the shaft support member 37 includes a pair of attachment plates 39 and 40, and the damper member 36 is attached by a screw member 45 between the pair of attachment plates 39 and 40. It is configured.

  As shown in FIGS. 12 and 14, the pair of attachment plates 39, 40 are attached to the side plate 2 of the musical instrument case 1 by screws 41, and from the end portions of the attachment pieces 39a, 40a, respectively. Standing pieces 39b and 40b that rise toward the lower and upper portions of the damper member 36, and support pieces 39c and 40c that extend from the upper ends of the standing pieces 39b and 40b along the lower and upper portions of the damper member 36, respectively. However, these are each bent in a staircase shape.

  As shown in FIG. 14, both end portions 38 a that are free ends of the gear shaft 38 in the damper member 36 can be rotated at locations where the support pieces 39 c, 40 c of the pair of mounting plates 39, 40 oppose each other. Supporting bearing holes 42a and 42b are respectively provided. The support pieces 39c, 40c of the pair of mounting plates 39, 40 have screw insertion holes 43a, 43b into which the screw members 45 are inserted, and projecting portions 36c of the housing 36a projecting to the outer peripheral side of the damper gear 17. It is provided corresponding to each mounting hole 36d.

  In this case, as shown in FIG. 14, the screw member 45 is inserted into the mounting hole 36d provided in the protruding portion 36c of the housing 36a protruding to the outer peripheral side of the damper gear 17 in the damper member 36. In this state, the nut 45a is inserted. The damper member 36 is configured to be attached by tightening the pair of housings 36a.

  Further, as shown in FIG. 14, the screw member 45 has both end portions inserted into the screw insertion holes 43 a and 43 b of the pair of mounting plates 39 and 40, and a damper member between the pair of mounting plates 39 and 40. In this state, the damper member 36 is attached between the pair of attachment plates 39, 40 by tightening the pair of attachment plates 39, 40 from the outside with the nut 45a.

  According to the lid opening / closing device 35 of the keyboard lid 8 as described above, the shaft support member that rotatably supports the both end portions 38a that are the free ends of the gear shaft 38 that is attached to the damper gear 17 and protrudes to the outside of the damper member 36. 37 is provided, and, as in the first embodiment, even if a large radial load is applied to the damper gear 17, the gear shaft 38 can be prevented from swinging and the opening / closing operation of the keyboard lid 8 can be stabilized. The damper member 36 can satisfactorily brake the opening / closing operation of the keyboard lid 8.

  That is, in the lid opening / closing device 35, when the damper gear 17 is meshed with the interlocking gear 13 accompanying the opening / closing operation of the keyboard lid 8 and rotates, both end portions 38a that are free ends of the gear shaft 38 are pivoted by the damper member 36. Since the support member 37 is rotatably supported, even if a large radial load is applied to the damper gear 17, the shaft support member 37 can reliably prevent the gear shaft 38 from swinging. As a result, the damper gear 17 can be favorably rotated by the gear shaft 38, so that the opening / closing operation of the keyboard lid 8 can be stabilized, and the opening / closing operation of the keyboard lid 8 can be satisfactorily braked by the damper member 36. Can do.

  In this case, since the shaft support member 37 rotatably supports both end portions 38a that are free ends of the gear shaft 38 in a state of being fixed to the musical instrument case 1, the interlocking gear 13 together with the keyboard lid 8 is supported. When rotating around the support shaft 12, the runout of the gear shaft 38 can be reliably prevented. Therefore, the damper gear 17 can be reliably and satisfactorily engaged with the tooth portion 13a of the interlocking gear 13, and the rotation of the interlocking gear 13 accompanying the opening / closing operation of the keyboard cover 8 can be reliably transmitted to the damper gear 17. The opening / closing operation of the keyboard lid 8 can be reliably and satisfactorily braked in a more stable state than the first embodiment by the shaft support member 37.

  That is, the shaft support member 37 includes a pair of mounting plates 39 and 40 that are fixed to the side plate 2 of the musical instrument case 1, and bearing holes 42 a that are respectively provided at locations facing each other in the pair of mounting plates 39 and 40. Since both end portions 38a, which are free ends of the gear shaft 38 of the damper member 36, are rotatably supported by the damper member 36, the both ends 38a, which are free ends of the gear shaft 38, can be reliably and simply configured. It can be firmly supported.

  For this reason, even if a large radial load is applied to the damper gear 17, the pair of mounting plates 39 and 40 can reliably prevent the shaft shaft 38 from swinging. Thus, the damper gear 17 can be reliably and satisfactorily engaged with the tooth portion 13a of the interlocking gear 13, and the rotation of the interlocking gear 13 accompanying the opening / closing operation of the keyboard lid 8 can be reliably transmitted to the damper gear 17. Thus, the opening / closing operation of the keyboard lid 8 can be reliably and satisfactorily braked in a stable state.

  In the first and second embodiments described above, the case where the present invention is applied to the keyboard lid 8 of the keyboard instrument has been described. However, the keyboard lid 8 of the keyboard instrument is not necessarily required. It can be widely applied to the body.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 2 Side plate 3 Bottom plate 5 Back plate 6 Keyboard part 8 Keyboard lid 10, 30, 35 Lid opening / closing device 11 Arm member 12 Support shaft 13 Interlocking gear 13a Interlocking gear tooth portion 14, 36 Damper member 15, 38 Gear shaft 15a Outer end portion 15b which is free end of gear shaft Inner end portion of gear shaft 16, 31, 37 Shaft support member 17 Damper gear 20 Guide groove 38a Both end portions of gear shaft 39, 40 A pair of mounting plates 42a, 42b Bearing holes

Claims (6)

A gear mounted with a case, a lid rotatably attached to the case by a support shaft, an interlocking gear that rotates with the lid around the support shaft, and a damper gear that meshes with the interlocking gear and rotates In a lid opening and closing device comprising a damper member having a shaft and braking the rotation of the interlocking gear,
A lid opening / closing device comprising: a shaft support member that rotatably supports at least a free end protruding outside the damper member among both end portions of the gear shaft in the damper member.   The shaft support member is provided on the interlocking gear that rotates together with the lid, and rotatably supports the free end that is the other end of the gear shaft that is rotatably supported at one end by the damper member. The lid opening / closing device according to claim 1.   The lid opening / closing apparatus according to claim 2, wherein the shaft support member has a guide groove in which the free end of the gear shaft relatively moves according to the rotation of the interlocking gear.   The lid opening / closing device according to claim 3, wherein the guide groove is formed in an arc shape centering on the support shaft that is a rotation center of the interlocking gear.   The shaft support member is fixed to the case together with the damper member, and rotatably supports the free end which is the other end portion of the gear shaft whose one end portion is rotatably supported by the damper member. The lid opening / closing device according to claim 1. The said shaft support member is fixed with respect to the said case, and supports the both ends which are the said free ends of the said gear shaft which protruded outside the said damper member rotatably. Lid opening / closing device.

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