JP2008309408A - Damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive damper device, surely in operation, having high reliability, having a simple structure, and superior in assembling performance. <P>SOLUTION: This damper device is provided so that a driving part 4 has a case 12 forming the contour, a motor 13 as a reciprocally rotatable driving source, a driving gear 15 transmitting rotation of the motor 13, and a driven gear 16 rotating by being driven by the driving gear 15, and the driving gear 15 has a gear part 15b meshing with the driven gear 16 only in opening-closing operation and meshing with the driven gear 16 only in a predetermined period by removing meshing with the driven gear 16 when opening and when closing, and a holding part 15c holding a position of the driven gear 16 when opening and when closing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a damper device that opens and closes an opening portion by a baffle, and particularly to a damper device that adjusts temperature by opening and closing a cold air passage inside a storage room in a refrigerator or the like.

  Conventionally, as a means for controlling the temperature of a plurality of refrigerator compartments in a refrigerator, a damper device that controls the amount of cold air flowing into each refrigerator compartment by opening and closing the air passage of the cold air from the cooler to each refrigerator compartment with a baffle These are roughly divided into a system in which one baffle is operated by one driving source and a system in which two baffles are operated by one driving source.

  The method of operating one baffle with one drive source is one that opens and closes one opening by rotation control of a motor. As this typical damper device, the one described in Patent Document 1 is known. Yes.

  8 to 11 show a conventional damper device described in Patent Document 1, FIG. 8 is a front view of the conventional damper device, and FIG. 9 is a rear view of the conventional damper device from the back. FIG. 10 is a side view including a partial cross-sectional configuration of the conventional damper device, and FIG. 11 is a plan view showing the internal structure of the drive unit of the conventional damper device.

  As shown in FIGS. 8 to 11, the damper device includes a frame 101, an opening 102 formed in the frame 101, a protrusion 103 provided around the opening 102, and a baffle 104 that opens and closes the opening 102. And a soft tape 105 affixed to the baffle 104, and a drive unit 106 that is disposed on the side surface of the frame 101 and that opens and closes the baffle 104.

  The drive unit 106 includes a case 107 that forms an outline of the drive unit, a motor (pulse motor or the like) 108 that can be rotated in the forward and reverse directions as a drive source, a pinion 109 that is attached to the rotation shaft of the motor 108, and a motor. The reduction gear train 110 composed of three gears a, b, and c for reducing the rotation of the gear 108, the drive gear 111 to which the rotation of the motor 108 decelerated by the reduction gear train 110 is transmitted, and the drive gear 111 mesh with each other. In addition, the baffle 104 is connected to a rotation shaft and a rotation center shaft 112 to be driven by a driven gear 113 that rotates the baffle 104.

  The operation of the damper device configured as described above will be described below.

  First, when the motor 108 is driven in the opening direction from the state where the baffle 104 is closed, the rotation is transmitted to the driving gear 111 via the reduction gear train 110, and the driven gear 113 is rotated in the opening direction. As a result, the baffle 104 is separated from the opening 102 and is opened after a predetermined rotational operation of the motor 108, and cool air flows into the refrigerator compartment. The open position state is maintained by the detent torque of the motor 108.

  From this state, when the motor 108 is driven in the opposite direction, the baffle 104 rotates, the protruding portion 103 of the opening 102 comes into contact with the soft tape 105 fixed to the baffle 104, and the motor 108 is rotated after a predetermined rotation operation. , Stops and closes to prevent cold air from flowing into the refrigerator compartment. Since the detent torque of the motor 108 becomes a large value at the portion of the rotation center shaft 112 via the reduction gear train 110, the baffle 104 is held in the closed position.

Normally, the motor 108 has an open position and a closed position set at a predetermined rotation angle. First, the opening / closing operation is controlled with reference to a point where the motor is rotated and locked to the closed side.
JP 2003-322455 A

  However, in the above-described conventional configuration, the drive gear 111, the driven gear 113, and the like are always in mesh with each other, so that the load is applied to each gear even when the baffle 104 is stopped open or closed. If the rotation angle of the motor 108 is deviated due to variations in noise or noise, the baffle 104 is not completely closed, and a gap is generated between the soft tape 105 and the protruding portion 103 of the opening 102. There was a problem that a reliable opening / closing operation could not be performed, such as a leak of cold air, or the baffle 104 not being fully opened and sufficient cold air not flowing into the refrigerator compartment.

  In the conventional configuration, the drive unit 106 requires a case 107, a pinion 109, a reduction gear train 110 including three gears, a drive gear 111, a driven gear 113, and the like. In addition, there is a problem that assembly takes time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a damper device that solves the above-described conventional problems, has reliable operation, has high reliability, has a simple structure, is easy to assemble, and can be configured at low cost.

  In order to solve the above-described conventional problems, the damper device of the present invention specifies the meshing range of the drive gear and the driven gear, and the drive gear meshes with the driven gear only when the baffle is opened or closed. Once the opening (full opening) or the closing (full closing) is established, the driving gear rotates but the meshing between the driving gear and the driven gear is disengaged.

  With this configuration, the baffle opens or closes during the meshing period of the drive gear and the driven gear, and the drive gear rotates for a predetermined time while the meshing of the drive gear and the driven gear is disengaged.

  Therefore, when the baffle is in the “open” or “closed” state, the drive gear rotates for a while but is disengaged, so that the torque from the drive gear does not act on the driven gear, and the driven gear is unnecessary. There is no load.

  Furthermore, even if the motor (driving gear) stops before the rotation of the predetermined angle ends due to control variation or noise, the motor (driving gear) exceeds the meshing range of the driving gear and the driven gear. ) Has an allowance for rotation, the baffle does not stop halfway, and the "open" or "close" operation can be ensured.

  The damper device of the present invention can reliably open and close the baffle and can be highly reliable in long-term use. Further, since the structure can be simplified, the assemblability is good, and the low manufacturing cost can be realized and the cost can be reduced.

  The invention according to claim 1 is a damper device including a frame having an opening, a baffle that opens and closes the opening, and a driving unit that drives the baffle, wherein the driving unit forms a case; A drive source capable of rotating in the forward and reverse directions, a drive gear to which the rotation of the drive source is transmitted, and a driven gear driven to rotate by the drive gear, and further, the baffle is closed or closed from the open to the drive gear. A gear part that meshes with the driven gear only when it is operated from the open position to the open position, and disengages from the driven gear when it is in the open state and the closed state; and the meshing state of the driven gear is disengaged in the open state and the closed state. A holding part for holding the state is provided.

  With this configuration, the baffle is opened or closed during the meshing period of the drive gear and the driven gear. When the baffle is in the “open” or “closed” state, the meshing of the drive gear and the driven gear is not performed. Therefore, torque by the drive gear does not act on the driven gear. Therefore, an excessive force is not applied to the baffle, and the close contact state between the baffle and the opening can be made stable and good for a long time.

  The invention according to claim 2 is the invention according to claim 1, wherein a rotation angle restricting means for restricting the rotation angle of the drive gear is provided on the case and protrudes toward the drive gear; The drive gear is provided so as to draw an arc, and is provided with a recess into which the convex portion is fitted, so that the drive gear can be rotated in a range of a start end and a terminal end of the recess.

  By adopting such a configuration, the rotation angle of the drive gear can be regulated within the projection surface of the drive gear, so that the configuration area for regulating the rotation angle can be reduced, and the fitting configuration of the concave portion and the convex portion Therefore, the dimension can be minimized even in the height direction. As a result, the rotation angle restricting means can be made compact, and the damper device can be downsized. This is also advantageous for incorporation into the main body on which the damper device is mounted.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the drive source is a geared motor having a reduction mechanism inside.

  With this configuration, the number of reduction gears can be reduced, so that the drive unit can be reduced in size, the structure can be simplified, and an inexpensive damper device with good assemblability can be obtained.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the rotation angle of the drive gear by the rotation angle restricting means is set larger than the rotation angle at which the drive gear and the driven gear mesh. is there.

  With such a configuration, the meshing period of the drive gear and the driven gear can be ensured, the baffle opening / closing operation accompanying the rotation of the driven gear can be ensured, and the reliability can be improved.

  In other words, the drive gear continues to rotate for a while after the baffle has been opened or closed, so that the motor does not finish rotating at a predetermined angle due to control variations or noise superimposed on the power source. Even if a situation of stopping occurs, the “open” or “closed” state can be secured, and the motor can be returned to the normal state by rotating a predetermined angle during the next reversing operation.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the energizing time applied to the geared motor is provided at least in the convex portion provided in the case and the drive gear. From the contact state with the start or end of the recess, the convex portion is set to have a rotation angle that contacts the end or start of the recess.

  With this configuration, the rotation angle of the drive gear can be stably obtained, and the reliability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a front view including a partial cross-sectional configuration of a damper device according to Embodiment 1 of the present invention, FIG. 2 is a rear view of the damper device of the same embodiment as viewed from the back side, and FIG. AA line sectional view of a damper, FIG. 4 is a side view including a partial sectional configuration of the damper device of the embodiment, FIG. 5A is a state in which the baffle in the damper device of the embodiment is closed FIG. 5B is a plan view of the drive unit in a state where the baffle is opened in the damper device of the embodiment, and FIG. 6A is a drive of the damper device of the embodiment. FIG. 6B is a side view of the drive gear in the damper device of the embodiment, FIG. 7A is a plan view of the driven gear in the damper device of the embodiment, and FIG. b) is a side view of the driven gear in the damper device of the embodiment. It is.

  First, the structure of the damper device 1 will be described with reference to FIGS. 1 to 3.

  As shown in FIGS. 1, 2, and 3, the damper device 1 includes a resin frame 5, a baffle 3 that opens and closes an opening 2 formed in the frame 5, and a baffle 3 that is attached to the frame 5. A drive part 4 that rotates, a plate-like opening forming part 6 that forms part of the frame 5 and forms the opening 2, and a protruding part that is formed around the opening 2 and protrudes toward the baffle 3 7 is provided.

  A soft foam 8 is attached to the baffle 3 on the surface facing the protruding portion 7.

  Further, the frame 5 has a side wall 9 extending in a direction orthogonal to the opening forming portion 6 on the outer periphery of the opening forming portion 6, and the opening forming portion 6 is disposed at a substantially central portion of the side wall 9. Further, on the surface opposite to the surface on which the baffle 3 abuts in the opening forming portion 6, the corner on the driving portion 4 side formed by the rib 10 positioned parallel to the longitudinal side of the opening 2 and the side wall 9. It is the structure which provided the rib 11 (FIG. 1) located in a part.

  Each of the ribs 10 and 11 is intended to reinforce the strength of the structural portion constituted by the opening forming portion 6 and the side wall 9 in particular. Strengthening of the portion where the mounting portion 5a is connected is also performed. The mounting portion 5a of the drive unit 4 in the frame 5 also serves as a lid of the case 12 described later.

  Further, a connector 17 is provided at one corner of the drive unit 4 as a power input unit of the motor 13 described later.

  Next, the structure of the drive unit 4 will be described with reference to FIGS. 1, 4, and 5.

  As shown in FIGS. 1, 4, 5 (a), and 5 (b), the drive unit 4 is open on one side and forms an outer case, and can be rotated forward and backward as a drive source. A geared type motor 13 having a reduction mechanism inside, a pinion 14 attached to the output shaft of the motor 13, and meshing with the pinion 14 to decelerate the rotation of the motor 13 and to control the opening / closing operation of the baffle 3 The driving gear 15 is engaged with the driving gear 15, is connected to the baffle 3, and has a driven gear 16 that transmits the rotation of the driving gear 15 to the baffle 3.

  Here, in the present embodiment, a pulse-type DC motor is adopted as the motor 13, and drive control is performed by a known control in which the rotation angle of the motor 13 is controlled according to the number of pulses applied. Is done.

  Further, the case 12 and the drive gear 15 are provided with a rotation angle restricting means for restricting the rotation angle of the drive gear 15, specifically, on the inner surface of the side wall 12 b (FIG. 1) facing the opening of the case 12. A projecting ridge (fan-shaped) convex portion 12 a that draws a circular arc provided in a projecting manner is fitted into an arc-shaped concave portion 15 a provided in the drive gear 15. The concave portion 15a has a longer circumference than the convex portion 12a, and is set to have a dimensional relationship in which the drive gear 15 rotates by a predetermined angle in a state where the convex portion 12a is fitted.

  In the present embodiment, the rotation angle of the driven gear 16 is set to about 90 °, and the rotation angle of the drive gear 15 is set to about 120 °.

  That is, the dimensions of the convex portion 12a and the concave portion 15a are such that when the drive gear 15 rotates about 120 ° in one direction, one end of the convex portion 12a abuts on one end of the concave portion 15a and rotates about 120 ° in the opposite direction from that state. At this time, the other end of the convex portion 12a and the other end of the concave portion 15a are set in contact with each other.

  In other words, when the maximum number of pulses is applied to the motor 13 at the 0 ° base point of the motor 13 (the contact state between the convex portion 12a and the concave portion 15a), the drive gear 15 rotates by the maximum rotation angle (about 120 °). Is set to That is, the number of pulses described above corresponds to the energization time of the motor 13, and the state where the maximum number of pulses is applied is the state where the energization time is the longest.

  The driven gear 16 is set so that the meshing starts during the rotation of the drive gear 15 while the drive gear 15 rotates about 120 °, and the meshing is disengaged until the rotation of the drive gear 15 stops. . That is, the driven gear 16 is disengaged when the meshing with the drive gear 15 starts and rotates about 90 °, and the position (rotation angle) is maintained.

  By this operation, the driven gear 16 starts to rotate and the baffle 3 starts to be opened. When the meshing is released, the baffle 3 is maintained in the fully opened state, and when the meshing associated with the reverse rotation of the driving gear 15 is started, the baffle 3 is started. Is set so that the baffle 3 is fully closed when the engagement is released and the engagement is released.

  Further, the drive gear 15 continues to rotate by a predetermined angle from the point of time when the meshing with the driven gear 16 is released in each of forward rotation and reverse rotation.

  When a motor of a type that does not use a pulse power supply is used to drive the motor 13, the drive gear 15 can be driven at the maximum rotation angle in each of the forward and reverse directions by setting the energization time. it can.

  Next, a mechanism for opening and closing the baffle 3 will be described with reference to FIGS. 6 and 7.

  As shown in FIG. 6, the drive gear 15 includes four recesses 15 a that regulate the rotation angle of the drive gear described above, and four that protrude in the axial direction of the drive gear 15 and mesh with the driven gear 16 only when the baffle 3 is opened and closed. It has the structure which has the gear part 15b which has a tooth | gear, and the holding | maintenance part 15c formed over the perimeter except the gear part 15b.

  And the holding | maintenance part 15c is the same as the cutting edge circle diameter of the gear part 15b, or is made into the circular shape of a slightly large diameter, and is formed so that it may protrude lower than the gear part 15b in an axial direction.

  As shown in FIG. 7, the driven gear 16 includes a shaft portion 16 a connected to the baffle 3, a fan-shaped gear portion 16 b provided on the shaft portion 16 a and having nine teeth, and a holding portion 15 c of the drive gear 15. In order to avoid interference, it has the structure which has two notch parts 16c and 16d which notched a part of sector gear part 16b. The notches 16c and 16d are provided in a portion located between the teeth at both ends and a plurality of teeth at the center, and in this embodiment, the teeth at both ends excluding the three teeth at the center The tooth thickness of this portion is set to about half, and the diameter of the trough portion of the gear is also set in the radial direction.

  The motor 13, the pinion 14, the drive gear 15 and the driven gear 16 are arranged so that their meshing relationships are established as shown in FIG. More specifically, the notches 16c and 16d of the driven gear 16 face each other so as to be parallel to the holding portion 15c of the drive gear 15 in the axial direction, and the facing distance is the same as that of the gear portion 15b of the drive gear 15. The sector gear portion 16b of the gear 16 can be engaged, and when the gear portion 15b and the sector gear portion 16b are disengaged, the holding portion 15c of the drive gear 15 is notched while facing the notch portion 16c or 16d. The portions 16c and 16d are set so as to overlap with the remaining tooth portions.

  In other words, the number of teeth of each of the drive gear 15 and the driven gear 16 is set such that the driven gear 16 including the notches 16c and 16d is larger than the drive gear 15, and the notch of the driven gear 16 is also set. The facing distance between the portions 16c and 16d and the holding portion 15c of the drive gear 15 is arranged so as to be close or not.

  In the present embodiment, a geared type motor 13 that can rotate in the forward and reverse directions is used as a drive source. However, the motor 13 may be various motors that use DC or AC as a power source. However, it may be based on a mechanism that allows the drive gear 15 to rotate forward and backward.

  The operation of the damper device configured as described above will be described below.

  First, when the motor 13 is rotated so that the baffle 3 rotates in the opening direction from the closed state and the drive gear 15 is rotated, the holding portion 15c of the drive gear 15 and the sector gear portion 16b of the driven gear 16 face each other. The driven gear 16 is kept in the closed position while the gear is not engaged, so that the baffle 3 is maintained in the closed state, and when the drive gear 15 is further rotated, the gear portion 15b of the drive gear 15 When the sector gear portion 16b of the driven gear 16 is engaged, the driven gear 16 rotates, and the baffle 3 rotates in the opening direction as the shaft portion 16a rotates.

  Then, when the meshing of the gear portion 15b and the sector gear portion 16b of the driven gear 16 is disengaged due to the continuation of the rotation of the driving gear 15, the rotation of the driven gear 16 is stopped and the baffle 3 is opened and further continued. Due to the rotation of the drive gear 15, the notched portion 16 c of the driven gear 16 and the holding portion 15 b of the drive gear 15 face each other, and the holding portion 15 c of the drive gear 15 and the driven gear 16 do not interfere with each other.

  In the above state, the drive gear 15 continues to rotate, but the driven gear 16 does not rotate, and the open position of the driven gear 16 is maintained. As a result, the baffle 3 is not loaded more than necessary. The open state is maintained. Further, when the drive gear 15 is rotated, the rotation of the drive gear 15 is stopped at a position immediately before the fan-shaped concave portion 15a provided on the drive gear 15 and the fan-shaped convex portion 12a provided on the side wall 12b of the case 12 abut or abut. Then, the opening operation is terminated. That is, the maximum number of pulses is applied to the motor 13 at a position where the fan-shaped convex portion 12a and the concave portion 15a are in contact or just before contact.

  Next, when the motor 13 is rotated in the closing direction from the open state and the driving gear 15 is rotated in the reverse direction, while the holding portion 15c of the driving gear 15 and the sector gear portion 16b of the driven gear 16 are in contact with each other, Since the driven gear 16 is maintained in the open position, the baffle 4 is maintained in the open state.

  When the drive gear 15 is further rotated, the gear portion 15b of the drive gear 15 and the sector gear portion 16b of the driven gear 16 are engaged with each other, whereby the driven gear 16 rotates in the reverse direction and the baffle 3 is closed. Rotate to.

  Then, when the rotation further continues and the meshing of the gear portion 15b of the drive gear 15 and the sector gear portion 16b of the driven gear 16 is disengaged, the rotation of the driven gear 16 is stopped and the baffle 3 is closed.

  At this time, the shaft 16a and the baffle 3 of the driven gear 16 are already secured so that the engagement of the drive gear 15 and the driven gear 16 with the baffle 3 fully closed immediately before the engagement is released. By adjusting the connection in the rotational direction, the fully closed state of the baffle 3 can be maintained reliably.

  Further, due to the continued rotation of the drive gear 15, the holding portion 15 c of the drive gear 15 and a part of the teeth of the sector gear portion 16 b of the driven gear 16 come into contact with each other, and the notched portion 16 d of the driven gear 16 faces each other. The holding portion 15c of the gear 15 and the driven gear 16 do not interfere with each other.

  In the above state, the drive gear 15 continues to rotate in the opposite direction, but the closed position of the driven gear 16 is maintained. As a result, the baffle 3 is maintained in the closed state. In addition, the torque of the drive gear 15 does not act on the baffle 3, and the baffle 3 is kept in a good state without being excessively loaded and without causing permanent deformation. . Further, when the drive gear 15 rotates, the rotation of the drive gear 15 is stopped at a position immediately before the fan-shaped concave portion 15a provided on the drive gear 15 and the fan-shaped convex portion 12a provided on the case 12 come into contact or contact with each other. End the operation. In other words, the maximum number of pulses for reverse rotation of the motor 13 is applied at a position where the fan-shaped convex portion 12a and the concave portion 15a contact or just before contact.

  As described above, the drive gear 15 continues to rotate for a while in a state in which the engagement between the drive gear 15 and the driven gear 16 is disengaged. Therefore, the baffle 3 may stop in the middle of the opening or closing operation for some reason in the normal rotation state. Even if a situation occurs, the baffle 3 is reversely operated by the reverse rotation of the drive gear 15 and the drive gear 15 is rotated beyond the meshing angle of the drive gear 15 and the driven gear 16 to thereby correct the position error. It is possible to return to the above, and high reliability can be obtained.

  As an initialization operation for positioning the baffle 3, a pulse is applied to the motor 13 to temporarily rotate the motor 13 in the closing direction, so that the fan-shaped concave portion 15 a of the drive gear 15 and the fan-shaped convex portion 12 a of the case 12 come into contact with each other. The drive gear 15 is rotated until (the fully closed direction of the baffle 3). Then, the position is set as a reference position for closing, and thereafter, a predetermined number of pulses are applied in the opening direction (closing direction) to control the opening / closing operation. If the motor 13 is not of the pulse type, it can be similarly controlled by the energization time to the motor.

  As described above, in the damper device 1 of the present embodiment, the motor 13 that is a drive source capable of rotating in the forward and reverse directions, the drive gear 15 that transmits the rotation of the motor 13, and the driven gear 16 that is driven and rotated by the drive gear 15. The drive gear 15 is engaged with the driven gear 16 only when the baffle 3 is opened and closed, and is disengaged from the driven gear 16 when the baffle 3 is opened and closed, so that the drive gear 15 and the driven gear 16 are engaged with each other. The load is not applied more than necessary, and even when the rotation angle of the motor 13 is deviated due to control variations or the like, the open state and the closed state of the baffle 3 can be maintained, and the opening / closing operation is ensured. And can be highly reliable.

  In addition, the fan-shaped convex portion 12a provided on the case 12 and the fan-shaped concave portion 15a provided on the drive gear 15 are configured to perform positioning at the time of closing and opening, so that the open position is not increased. In addition, the closed position can be reliably set, the operation is reliable, the reliability is high, and the cost can be further reduced.

  In addition, since the motor 13 is a geared motor having a reduction mechanism inside, the torque of the motor 13 is increased, so that the reduction gear can be reduced, the drive unit 4 can be reduced in size, the structure can be simplified, and the assembling property can be simplified. Good and cheap.

  As described above, the damper device according to the present invention can be widely applied to uses for opening and closing a fluid passage and performing fluid supply control, such as airflow control of a refrigerator.

The front view including the partial cross section structure of the damper apparatus in Embodiment 1 of this invention Rear view of the damper device of the same embodiment AA line sectional view of FIG. Side view including a partial cross-sectional configuration of the damper device of the same embodiment (A) The top view of the drive part in the state which the baffle in the damper apparatus of the embodiment closed The (b) The top view of the drive part in the state where the baffle in the damper apparatus of the embodiment opened (A) Top view of drive gear in damper device of same embodiment (b) Side view of drive gear in damper device of same embodiment (A) Plan view of the driven gear in the damper device of the embodiment (b) Side view of the driven gear in the damper device of the embodiment Front view of conventional damper device Rear view of the conventional damper device from the back Side view including a partial cross-sectional configuration of the conventional damper device The top view which shows the internal structure of the drive part of the conventional damper apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damper apparatus 2 Opening part 3 Baffle 4 Drive part 5 Frame 7 Protrusion part 12 Case 12a Convex part (rotation angle control means)
13 Motor (drive source)
15 Drive gear 15a Concave portion (rotation angle regulating means)
15b Gear part 15c Holding part 16 Driven gear 16b Fan-shaped gear part 16c, 16d Notch

Claims (5)

  In a damper device including a frame having an opening, a baffle that opens and closes the opening, and a driving unit that drives the baffle, the driving unit includes a case that forms an outer shell, and a drive source that can rotate forward and reverse. A drive gear to which the rotation of the drive source is transmitted, and a driven gear driven to rotate by the drive gear, and the driven gear is driven only when the baffle is operated from open to closed or from closed to open. A gear portion that meshes with the gear and disengages from the driven gear when in the open state and the closed state, and a holding portion that holds the state where the meshing of the driven gear is disengaged when in the open state and the closed state are provided. Damper device.   Rotation angle restricting means for restricting the rotation angle of the drive gear is provided on the case, and is provided to project the drive gear side so as to draw an arc on the drive gear. The damper device according to claim 1, wherein the driving gear is configured to be rotatable in a range of a start end and a terminal end of the recess.   The damper device according to claim 1, wherein the drive source is a geared motor having a speed reduction mechanism therein.   The damper device according to claim 2 or 3, wherein a rotation angle of the drive gear by the rotation angle restricting means is set larger than a rotation angle at which the drive gear and the driven gear mesh.   The energization time applied to the geared motor is changed so that at least the convex portion abuts on the terminal end or the start end of the concave portion from the contact state between the convex portion provided on the case and the starting end or the terminal end of the concave portion provided on the drive gear. The damper apparatus as described in any one of Claim 2 to 4 set so that it might become an angle.