JP2016160882A - Oscillation mechanism for electric fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small electric fan with an oscillation mechanism of a small size and for a general purpose.SOLUTION: An oscillation mechanism for an electric fan comprises: an electric fan body A for performing swing operations; a pedestal part C constituted of a bottom plate 41 and a base part 25 turnably mounted at an upper portion of that bottom plate 41; and a swing driving unit B, and is provided with a swing driving motor 13 in the swing driving unit B, wherein the swing driving unit B is held in the electric fan body A. The swing driving unit B includes: a cam body 21 drive-linked to the rotation of the motor 13; an oscillation rack body 20 for oscillatory actions in a driven linkage to that cam body and having a rack 20a at the oscillation end part; and a ratchet gear 40 held on the bottom plate 41 of the pedestal part C. The rack 20a and the ratchet gear 40 mesh each other, and a coil spring 42 forced to contact with the base part 25 is arranged at the central cylinder part of the ratchet gear 40.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a swing mechanism of a type in which a fan is provided with a motor dedicated to swinging.

  As the swing mechanism of the electric fan, the one using a link mechanism often used in household electric fans, the one using the precession used in the ceiling suspension electric fan of a train, the servo motor for swinging A device that reciprocates by changing the rotation direction of the motor is known. In addition, a louver (front cover) that rotates and changes the wind direction without using a swing mechanism is also used.

  Furthermore, as a typical three-dimensional head swing mechanism, there are ones that use two servo motors or two link mechanisms to combine the X-axis and Y-axis swinging motions.

  As the swing mechanism of the electric fan described above, the arm becomes shorter when the link mechanism is downsized, so the difference in speed between the right and left rotations of the swing reciprocating motion becomes large, and it is difficult to increase the swing angle. Has the following disadvantages.

  What swings using a servo motor has the advantage that the structure is simple and there is no difference between left and right reciprocating motion and the degree of freedom of swinging angle is large, but it is disadvantageous in that it is expensive.

  If the three-dimensional swing mechanism uses two motors, it is difficult to synchronize the two motors. For this reason, the direction of the two motors is randomly changed by providing a rotation difference. There is a disadvantage that the period of change is not constant and the cost is high because two motors are used.

  In addition, the three-dimensional swing mechanism that uses two link mechanisms needs to match the phases of the X-axis and Y-axis at the time of assembly, and it is difficult to reduce the size of the mechanism. Is inconvenient.

  Therefore, the applicant of the present application has previously proposed a small and versatile swing mechanism in a small fan (Patent Document 1).

Japanese Patent No. 5649085

  As shown in FIG. 4 to FIG. 8, the invention includes a pedestal C having a fan main body A that swings, a bottom plate 41, and a pedestal 25 that is rotatably provided on the bottom plate 41. And a swinging drive unit B provided between the electric fan main body A and the pedestal C, and a swinging mechanism for a fan provided with a swing drive motor 13 in the swing drive unit B. The head drive unit B is held by the electric fan main body A and provided with left and right unit cases 15 and 22 fixed to the base portion 25 of the base portion C, and the motor is interposed between these unit cases 15 and 22. 13, the cam body 21 that is linked to the rotation of the cam 13, the rocking rack body 20 that swings in conjunction with the cam body and is provided with a rack 20 a at the rocking end, and the bottom plate 41 of the pedestal portion C. Ratchet gear 40 , Together with and a rack 20a and the ratchet wheel 40 of the swinging rack body 20 is a swing mechanism of the fan constructed in mesh.

  Further, in the second invention described above, the head of a fan of the type in which a swing drive unit B is provided between the electric fan main body A and the pedestal C, and the swing drive motor 13 is provided in the swing drive unit. In the swing mechanism, the electric fan main body A includes one and the other case portions (the middle case 3 and the rear case 6) that cover the swing drive unit B, and the other case portion (the rear case 6) has a swing drive. The holding unit 63 of the swing drive unit B that holds the upper end portion of the unit B is provided, and the holding unit 63 and the upper end portion of the swing drive unit B are connected to the case portion and the swing drive unit B. The swing drive unit B includes a cam body 21 that is drivingly linked to the motor 13 and a unit case 22 that rotatably supports the cam body. Swing drive The lower part of the base B is fixed to the pedestal C, and the cam body 21 is positioned in the vertical direction, and an 8-shaped cam groove 21a is formed in the vertical surface portion of the cam body on the unit case side. The unit case 22 is provided with a long hole 22b facing the 8-shaped cam groove 21a, and the one case portion (the middle case 3) at a position facing the long hole 22b of the unit case 22 This is a swing mechanism of a fan that is provided with a front / rear drive control pin 24 whose front end is inserted through the elongated hole 22b and engages with the 8-shaped cam groove 21a.

  The third aspect of the invention includes a fan main body A that performs a swinging motion, a base portion C that includes a bottom plate 41 and a base portion 25 that is rotatably provided on the top of the bottom plate 41, and a fan main body A. And a swing drive unit B provided between the pedestal C, and a swing drive unit in a swing mechanism of a fan provided with a swing drive motor 13 in the swing drive unit B. B is provided with left and right unit cases 15 and 22 which are held by the electric fan main body A and fixed to the pedestal portion 25 of the pedestal portion C, and is linked to the rotation of the motor 13 between these unit cases 15 and 22. A cam body 21 that swings in conjunction with the cam body 21 and is provided with a rack 20a at its swing end, and a ratchet gear 40 that is held by the bottom plate 41 of the base C. And comprising Both the rack 20a of the swing rack body 20 and the ratchet gear 40 are configured to mesh with each other, and the electric fan main body A includes one and other case portions (the middle case 3 and the rear case) that cover the swing drive unit B. 6), and the other case portion (rear case 6) includes a holding portion 63 of the swing driving unit B that holds the upper end portion of the swing driving unit B. The upper end portion of the swing drive unit B constitutes a pivot point for relative rotation in the case portion (the middle case 3 and the rear case 6) and the swing drive unit B, and the cam body 21 is positioned in the vertical direction. In addition, an eight-shaped cam groove 21a is formed in the vertical surface portion of the cam body on the unit case side, and the unit case 22 is provided with a long hole 22b facing the eight-shaped cam groove. , Unit The one case portion (middle case 3) at a position facing the long hole 22b of the case 22 has a front-rear drive control pin whose front end is inserted through the long hole 22b and engages with the 8-shaped cam groove 21a. 24 is a swing mechanism of an electric fan provided with 24.

  In the fourth aspect of the invention, the ratchet gear 40 includes a ratchet claw 40b. On the other hand, a tooth portion 41b that engages with the ratchet claw 40b is provided at a portion that holds the ratchet gear 40 in the pedestal C. This is a swing mechanism of a fan having a ratchet structure.

  According to the first aspect of the invention, the swing rack body 20 swings as the motor 13 rotates, and the swing rack body 20 swings relative to the rack 20a of the swing rack body and the ratchet gear 40 meshing therewith. The moving rack body 20 meshes around the ratchet gear 40 and reciprocally rotates, whereby the swing drive unit B is rotationally driven, and the electric fan main body A swings in the horizontal direction. Can now get.

  According to the second aspect of the invention, the cam body 21 rotates with the rotation of the motor 13, and the cam body rotates eccentrically to drive the front / rear drive control pin 24 engaged with the 8-shaped cam groove 21a. The front / rear drive of the front / rear drive control pin causes the swing drive unit B to swing in the front / rear direction via the case portion 3, thereby moving the electric fan main body A holding the swing drive unit B in the front / rear direction. It is now possible to obtain a swing mechanism for a fan that swings.

  According to the third aspect of the invention, the swing rack body 20 swings with the rotation of the motor 13, and the relative drive between the rack 20a of the swing rack body 20 and the ratchet gear 40 engaged therewith The swing rack body 20 meshes with the ratchet gear 40 and reciprocally rotates, whereby the swing drive unit B swings in the horizontal direction, and the cam body 21 rotates eccentrically. The front / rear drive control pin 24 engaged with the cam groove 21a is driven back and forth, and the front / rear drive control pin 24 drives the front / rear drive unit B through the case part (the middle case 3) to move back and forth. Therefore, the swinging mechanism of the electric fan in which the electric fan main body A is driven in the horizontal direction and the front-rear direction can be obtained by combining the horizontal swing driving and the front-rear swinging drive. It became a jar.

  According to the fourth aspect of the present invention, it is possible to obtain the swing mechanism of the electric fan having the ratchet structure in which the engagement between the ratchet pawl 40b and the tooth portion 41b is released when an external force is applied to the swing drive unit B. It is now possible.

  According to each of the above inventions, the above-described operational effects can be achieved, and extremely useful techniques can be provided. The present invention is a further development of the above-described invention.

  That is, in the case of the above invention, the swinging housing (the base portion 25 of the pedestal portion C in the above invention) is placed on the bottom plate 41 side portion such as the ratchet portion (the ratchet gear 40 in the above invention) by its own weight. Therefore, even if a slight resistance is applied to the cord for motor wiring or the like in the swing drive unit B, the influence also appears in the swing drive unit B, and in the meshing between the rack 20a and the ratchet gear 40, There is a possibility that the swinging drive unit B may be fluttered by the backlash of the gear.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to propose a swing mechanism of a fan that can avoid such a swing in the swing drive unit B.

The invention described in the first claim of the present application is described with the reference numerals used in the embodiments, and the electric fan main body A that performs the swinging operation, the base plate 41, and a base that is rotatably provided on the upper part of the base plate 41. And a swing drive unit B provided between the electric fan main body A and the base C, and the swing drive unit B is used for swing drive. A motor 13 is provided, and the swing drive unit B is a swing mechanism of the electric fan held by the electric fan main body A.
The swing drive unit B includes a cam body 21 that is drivingly linked to the rotation of the motor 13, and a swinging rack body that swings in conjunction with the cam body and is provided with a rack 20a at its swinging end. 20 and a ratchet gear 40 held by the bottom plate 41 of the pedestal portion C, and the rack 20a of the swing rack body 20 and the ratchet gear 40 mesh with each other,
Further, the swing mechanism of the electric fan has a structure in which a coil spring 42 is disposed at the center of the ratchet gear 40 and the upper end of the coil spring 42 is pressed against the base 25.

  The invention described in claim 2 of the present application is that, in claim 1, a cylindrical step portion 40d is provided in the central tube portion 40c of the ratchet gear 40, and the coil spring 42 is attached to the step portion 40d. This is a swing mechanism of a fan having a configuration in which spacers 43 are arranged at the upper and lower ends of the coil spring 42.

  According to the present invention, even if there is a backlash in the meshing of the gears, when the resistance is applied to the cord such as the motor wiring, it is possible to obtain a smooth rotation of the swing drive unit B without being affected by this, As a result, the rotation unevenness of the swing drive unit B can be avoided.

It is a vertical side view which shows the swing mechanism of an electric fan. It is a figure which shows the engagement structure of the ratchet part in a base part of FIG. 1, and a base part. It is a figure which shows the state which concerns on the Example of this invention and attached the coil spring to the ratchet part of FIG. It is a figure which shows what provided the step part in the ratchet part in a base part. It is a disassembled perspective view which shows the swing mechanism of an electric fan concerning a prior art example. It is a disassembled perspective view which concerns on a prior art example and shows a swing unit part. It is a disassembled perspective view which concerns on a prior art example and shows a swing unit part. It is an assembly perspective view which shows a swing unit part concerning a prior art example. It is an external view which shows the principal part of the swing mechanism of an electric fan concerning a prior art example, Comprising: (a) is a figure from a side surface direction, (b) is a perspective view from a front upper right direction, (c) is a back upper direction. FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings. First, a description will be given of a swing mechanism of a fan in a conventional example as a premise of the present invention with reference to FIGS.

  In FIG. 4, the swing mechanism of the conventional electric fan includes a fan main body A that performs a swing motion, a swing drive unit B, and a pedestal C.

  The electric fan main body A constitutes a blower section. In FIG. 5, the front case 1, the downstream impeller 2, the middle case 3, the downstream motor 4, the upstream motor 5, the rear case 6, the upstream impeller 7, A grill cover 8 and switch circuit portions 9, 10, 11, 12 are formed.

  Further, as shown in FIG. 6, the middle case 3 is formed below a columnar portion 31 that hangs down from the motor covering portion, a horizontal plate-shaped portion 32 that covers the holding portion 63 of the rear case 6, and a horizontal plate-shaped portion 32. The switch placement portion 33 and a projecting piece 34 projecting from the one side surface of the switch placement portion 33 toward the rear case 6 are provided.

  The protruding piece 34 is formed at a location corresponding to the elongated hole 22 b of the right unit case 22, and includes a hole 34 a for inserting the front / rear swing control pin 24.

  The rear case 6 includes a columnar portion 61 that hangs down from the motor covering portion, a placement portion 62 of the swing driving unit B, and a holding portion 63 of the swing driving unit B that is formed at the lower end of the columnar portion 61. Is provided. The holding portion 63 holds the upper bearing portion (upper shaft 20c) of the swing drive unit B described later.

  The switch circuit units 9, 10, 11, and 12 are installed in the switch placement unit 33 of the middle case 3. In addition, 10 is a circuit board, 11 is a push switch, 12 is a slide switch, and both of these push switch 11 and slide switch 12 can be operated with the button 9. This button 9 is attached to the hole 1 a of the front case 1.

  As shown in FIGS. 5 to 9, the swing drive unit B is formed by a motor 13 having a worm gear 13 a fixed to a motor shaft, a bush 14, a left unit case 15, and gears 16, 17, 18, 19 in order. A reduction gear train, a swing rack body 20, a cam body 21 that is rotationally driven by the gear 19, and a right unit case 22.

  The left unit case 15 fixes the motor 13, and includes a bearing portion 15a at the upper portion, a support shaft 15b for the gear 19 of the reduction gear train, and a fixing portion 15c with the right unit case 22, and a lower end of a pedestal portion C to be described later. It is placed on the pedestal 25. The bearing portion 15 a supports one end of the upper shaft 20 c of the swing rack body 20.

  The reduction gear train includes a gear 16 that meshes with the worm gear 13a and the large-diameter gear 16a, a gear 17 that meshes with the small-diameter gear 16b of the gear 16, and a small-diameter gear 17b that meshes with the large-diameter gear 17a. The meshing gear 18 and the small-diameter gear 18b of the gear 18 are constituted by a gear 19 that meshes with the large-diameter gear 19a.

  The small-diameter gear 19b of the gear 19 meshes with the gear receiving portion 21c of the cam body 21 described later. The small-diameter gear 19b has a cylindrical portion at the center, and this cylindrical portion is fitted to a protruding shaft 21b formed at the center of the gear receiving portion 21c. Accordingly, the small diameter gear 19b and the gear receiving portion 21c are configured to be reliably engaged with each other.

  The rocking rack body 20 includes a rocking upper shaft 20c at the upper part, a rack 20a at the lower part, and a cam engagement hole 20b in which the cam edge of the cam body 21 is fitted and engaged at the intermediate part.

  The rack 20a has a curved shape. This curved shape corresponds to an arc having a radius between the upper shaft 20c and the rack 20a.

  The outer peripheral edge of the cam body 21 constitutes a cam edge that is eccentric with respect to the cam body rotation center, and a gear receiving portion 21c on the speed reduction gear train side, and an eight-letter shape on the back surface (right unit case 22 side). Projecting shafts 21b projecting from the front and back sides are formed at the centers of the cam groove 21a and the gear receiving portion 21c, respectively.

  The right unit case 22 has a shaft portion 22a at the top, a long hole 22b facing the 8-shaped cam groove 21a on the back surface of the cam body 21, a fixing portion 22c with the left unit case 15, and a portion protruding in the direction of the left unit case 15 The shaft part 22d formed in the front-end | tip part is provided. A small-diameter gear 16b of the gear 16 is attached to the shaft portion 22d. A bush 23 is attached to the shaft portion 22a. A fixing portion 15c (in this example, a shaft) of the left unit case 15 is fixed to the fixing portion 22c. The fixing portion 22c is a hole in this example, and a screw (not shown) is inserted into the hole to fix the fixing portion 15c of the left unit case 15. In addition, as shown in FIG. 8, 22e is a hole, The protrusion shaft 21b of the cam body 21 is rotatably supported by this hole 22e. Further, the lower end of the right unit case 22 is placed on the pedestal 25 of the pedestal C.

  In the right unit case 22, the shaft portion 22 a engages with an upper portion (a portion corresponding to the shaft 20 c) of the swing rack body 20 to support the swing rack body 20. Further, the right unit case 22 holds the upper part of the swing rack body 20 together with the left unit case 15 (see FIG. 8). The upper part of the swing drive unit B thus assembled (the upper part of the left unit case 15, the upper part of the swing rack body 20, and the upper part of the right unit case 22) holds the rear case 6 as described above. Held in the part 63.

  The upper portion of the swing drive unit B is held by the holding portion 63 of the rear case 6 and further covered by the horizontal plate-like portion 32 of the middle case 3. In this way, the swing drive unit B swings relative to the electric fan body A with the upper part as a fulcrum. In this example, the swing drive unit B is fixed to the base portion 25 of the pedestal portion C, so that the electric fan body A swings relative to the swing drive unit B.

  The swing of the electric fan main body A with respect to the swing drive unit B is prevented from being fixed to each other by members not shown when the electric fan main body A rotates horizontally, but it rotates in the front-rear direction. At that time, the rocking is performed.

  The long hole 22b of the right unit case 22 functions when the electric fan main body A swings in the front-rear direction, and is provided so as to face the 8-shaped cam groove 21a when the cam body is rotated, which will be described later. The elongated hole 22b is slightly curved so that when the longitudinal swing control pin 24 is inserted into the elongated hole 22b, the electric fan body A can swing in the longitudinal direction. The swinging of the electric fan main body A in the front-rear direction with respect to the swing drive unit B will be described in detail later.

  The pedestal C is composed of a bottom plate 41 with the ratchet gear 40 mounted on the cylindrical portion 41a, and a pedestal 25 provided on the top of the bottom plate 41 so as to be rotatable. The ratchet gear 40 includes a ratchet pawl 40b. Further, in the pedestal portion C, a tooth portion 41 b that engages with the ratchet pawl 40 b is provided at a portion that holds the ratchet gear 40. The ratchet claw 40b and the tooth portion 41b are provided with a ratchet structure so that the ratchet claw 40b and the tooth portion 41b are disengaged when a certain amount of external force is applied to the swing unit B. ing. In FIG. 5, reference numerals 26, 27, 28 and 29 denote bushes.

  Next, horizontal driving (horizontal driving) of the swing unit B will be described.

  The swing mechanism of the fan in this example is a type in which a swing drive unit B is provided between the fan main body A and the pedestal C, and the swing drive motor 13 is provided in the swing unit. As described above, the swing drive unit B includes the reduction gear trains 16, 17, 18, and 19 that transmit the rotation of the motor, the cam body 21 that is drivingly linked to the reduction gear train, and the cam body. A swing rack body 20 that swings in conjunction with the rack 20a at the swing end thereof, and a ratchet gear 40 that is held by the pedestal C, and further includes a rack of the swing rack body 20 20a and the ratchet gear 40 are meshed.

  In the above swing mechanism, the swing rack body 20 is swung by the rotation of the reduction gear trains 16, 17, 18, 19 and the cam body 21 by the rotation of the motor 13, and the rack 20a of the swing rack body and this The ratchet gear 40 meshes with the tooth portion 40a of the ratchet gear 40, so that the swing rack body meshes around the ratchet gear and reciprocates, thereby causing the swing drive unit B to move horizontally. Swing drive.

  In the above swing mechanism, as shown in FIGS. 1 to 2, the base portion 25 includes a cylindrical portion 25 a that protrudes downward at the center thereof, and this cylindrical portion 25 a is connected to the central cylindrical portion 40 c of the ratchet gear 40. Has been inserted. In the figure, reference numeral 44 denotes a positioning screw, which is inserted from the lower center of the bottom plate 41, and is positioned by fitting the cylindrical portion 25a of the base portion 25 onto this. Reference numeral 41c denotes a pulley that acts to smoothly rotate the pedestal 25.

  Further, in this example, as shown in FIGS. 1 and 3, a coil spring 42 is disposed at the center of the ratchet gear 40, and the upper end of the coil spring 42 is pressed against the base 25.

  As described above, when the coil spring 42 is arranged and the upper end portion of the coil spring 42 is pressed against the base portion 25, even if there is a backlash in the meshing of the gear, resistance is added to the cord such as the motor wiring. Therefore, smooth rotation of the swing drive unit B can be obtained without being affected by this, and consequently, uneven rotation of the swing drive unit B can be avoided.

  In this example, as shown in FIG. 4, a cylindrical step 40 d is provided at the center of the ratchet gear 40, the coil spring 42 is attached to the step 40 d, and the upper and lower ends of the coil spring 42 are further provided. A ring-shaped spacer 43 is arranged.

  In the case where the spacers 43 are arranged above and below the coil spring 42, the crushing state can be smoothly brought about as compared with the case where the upper end of the coil spring 42 is directly in contact with the pedestal 25.

  The swing mechanism of the electric fan of the present invention is suitable for a small electric fan that is driven using, for example, a USB of a personal computer as a power source.

A Fan body B Swing drive unit C Pedestal part 1 Front case 1a hole 2 Downstream impeller 3 Middle case 31 Columnar part 32 Horizontal plate part 33 Switch placement part 34 Projection piece 34a Hole 4 Downstream motor 5 Upstream motor 6 Rear case 61 Columnar part 62 Mounting part 63 Holding part 7 Upstream impeller 8 Grill cover 9, 10, 11, 12 Switch circuit part 13 Motor 13a Worm gear 15 Left unit case 15a Bearing part 15b Support shaft 15c Adhering part 16 Gear 16a Large diameter gear 16b Small diameter gear 17 Gear 17a Large diameter gear 17b Small diameter gear 18 Gear 18a Large diameter gear 18b Small diameter gear 19 Gear 19a Large diameter gear 19b Small diameter gear 20 Oscillating rack body 20a Rack 20b Cam engagement hole 20c Upper shaft 21 Cam Body 21a 8-shaped cam groove 21b protruding shaft 21c gear receiving portion 22 right unit case 2a Shaft portion 22b Long hole 22c Adhering portion 22d Shaft portion 22e Hole 23 Bush 24 Front / rear drive control pin 25 Base portion 25a Tube portion 26, 27, 28, 29 Bush 40 Ratchet gear 40a Tooth portion 40b Ratchet claw 40c Central tube portion 40d Step Part 41 Bottom plate 41a Tubular part 41b Tooth part 41c Pulley 42 Coil spring 43 Spacer 44 Positioning screw

Claims (2)

Provided between the electric fan main body A that performs the swinging operation, the base plate C that includes the base plate 41 and the base portion 25 that is rotatably provided on the upper portion of the base plate 41, and the electric fan main body A and the base portion C. The swing drive unit B is provided with a swing drive motor 13 in the swing drive unit B. The swing drive unit B is the neck of the fan held by the fan body A. In the swing mechanism,
The swing drive unit B includes a cam body 21 that is drivingly linked to the rotation of the motor 13, and a swinging rack body that swings in conjunction with the cam body and is provided with a rack 20a at its swinging end. 20 and a ratchet gear 40 held by the bottom plate 41 of the pedestal portion C, and the rack 20a of the swing rack body 20 and the ratchet gear 40 mesh with each other,
Further, the swing mechanism of the electric fan, wherein a coil spring 42 is disposed at the center of the ratchet gear 40 and the upper end of the coil spring 42 is pressed against the base 25. A cylindrical step portion 40d is provided in the central cylindrical portion of the ratchet gear 40, the coil spring 42 is attached to the step portion 40d, and spacers 43 are disposed at the upper and lower ends of the coil spring 42. The swing mechanism of the electric fan according to claim 1.

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