JP4020073B2 - Vibrating linear actuator and reciprocating electric cutting instrument using the same as a drive source - Google Patents

Description

  The present invention relates to a vibration type linear actuator used as a drive source for a reciprocating electric cutting instrument.

  Conventionally, a vibration type linear actuator having a structure in which a plurality of movers are driven to reciprocate with respect to a stator has been used as a drive source for a reciprocating electric cutting instrument such as a reciprocating electric shaver (see Patent Document 1). For example, as shown in FIG. 13, the vibration type linear actuator has a plurality of movers 2 corresponding to the movable blades 80 of the blade heads (not shown). It is configured to be driven by a single stator 1 that is opposed to a provided permanent magnet with a predetermined gap therebetween, and a chassis 4 connected to the stator 1 and each movable element 2 are connected to each other. 81 was connected. Therefore, in the above-described conventional vibration type linear actuator, when a large load is generated in one of the plurality of movable elements 2, only the amplitude of the movable element 2 is rapidly decreased. Therefore, there is a problem that a balanced amplitude cannot be obtained.

Therefore, in order to solve the above problems, for example, as shown in FIG. 14, a leaf spring 90 for connecting the movers 2 is provided, and this leaf spring 90 is elastically deformed in the reciprocating direction of the mover 2. There has been proposed a structure for preventing the amplitude from abruptly decreasing even when a large load is generated on the two movable elements 2 (see Patent Document 2). However, in this vibration type linear actuator, a connecting body 81 for connecting the chassis 4 and each mover 2, and a leaf spring 90 for connecting the movers 2 to each other to prevent a sudden decrease in amplitude, Are necessary, and the number of parts increases, so there is a problem in terms of downsizing and cost reduction.
JP-A-7-265559 JP 2003-134783 A

The present invention was invented in view of the above problems, and has a structure in which a plurality of movers are reciprocated with a balanced amplitude amount, and the number of parts is small, so that compactness and cost reduction can be achieved. it is an object of the present invention to provide a reduced vibration type linear actuator and round trip type electric cutting instrument you to as a drive source.

  In order to solve the above-described problems, the present invention is a vibration type linear actuator that reciprocally drives a plurality of movers 2 with respect to a stator 1. The fixed body 10 which is the stator 1 or the chassis 4 which holds this, and the connection body 3 are connected so that the connection body 3 can be rotated. Shall. In this way, the movable element 2 can be supported at a position facing the stator 1 with a predetermined gap via the coupling body 3, and further in conjunction with the reciprocation of the movable element 2. When the connecting body 3 rotates and the amplitude of one movable element 2 tends to decrease rapidly, the connecting body 3 is elastically deformed and its restoring force is a force for preventing the decrease of one amplitude. Will work. That is, by using the vibration type linear actuator using the connecting body 3, it is not necessary to prepare a member for supporting the mover 2 and a member for adjusting the amplitude amount and assemble them separately, thereby reducing the size and cost. It is intended.

  Here, it is preferable that the connection body 3 and the fixed body 10 are connected by fixing, and the connection body 3 can be rotated with respect to the fixed body 10 by torsional elastic deformation of the connection body 3. In this case, since a part of the connection body 3 functions as a torsion spring having a large elastic energy per unit volume, the entire connection body 3 can be made compact.

  Further, it is also preferable that the connecting body 3 is pivotally supported by the fixed body 10 so that the both are connected so that the connecting body 3 can be rotated with respect to the fixed body 10. The rotational movement will be performed smoothly.

Moreover , it is also preferable that the movers 2 are connected to each other by the connecting bodies 3 at both ends of the mover 2 in the reciprocating direction A. By doing in this way, it can prevent effectively that the amplitude of the one needle | mover 2 reduces rapidly from both sides, and also generation | occurrence | production of the stress in each connection body 3 is suppressed, and reliability is improved. It will improve.

Moreover, it is also preferable that the connection body 3 and the fixed body 10 are connected at two portions on the rotation center axis C of the connection body 3. By doing in this way, generation | occurrence | production of the stress in each connection body 3 is suppressed, and reliability improves.

  And it is set as the reciprocating electric cutting instrument which used the vibration type linear actuator which comprises the above-mentioned structure as a drive source, and connected the movable blade for reciprocating electric razors or the reciprocating blade for electric clippers to the mover 2. Thus, the reciprocating electric cutting instrument in which the plurality of movable elements 2 are reciprocated with a balanced amplitude amount can be provided as a compact and cost-reduced device.

The present invention shall more mover that achieved a round trip type electric cutting instrument shall be the vibratory linear actuator and which drive source of the structures reciprocate balanced amplitude of the balance of cost compact The effect that it can be provided as.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. 1 and 2 show a first example of a vibration type linear actuator according to an embodiment of the present invention. The vibration type linear actuator of this example includes a single stator 1, a pair of movable elements 2 arranged side by side so as to be spaced from the stator 1 by a predetermined gap, and a chassis 4 that holds the stator 1. The main body is formed by the connecting body 3 that connects the pair of movable elements 2 to each other and connects the movable elements 2 to the chassis 4.

  The mover 2 includes a permanent magnet 5, a yoke (back yoke) 6, and a frame member 9 that integrates the permanent magnet 5, and the permanent magnet 5 is bonded to a yoke 6 made of a magnetic material. The stator 1 is an electromagnet formed by laminating a sintered body of magnetic material or an iron plate of magnetic material to form an electromagnet. The chassis 4 is attached to the upper end of the stator 1 using a screw or the like. By fixing, the fixed body 10 is formed. Then, the thin plate-like connecting body 3 connected and fixed to the chassis 4 (that is, the fixed body 10) is connected to the pair of movers 2, and the mover 2 forms a predetermined gap with the stator 1 via the connecting body 3. It is supported in the position which opposes via. In the illustrated example, a pair of movers 2 having the same shape are arranged in reverse and parallel and parallel, and the permanent magnets 5 of both movers 2 are set to have different polarities. By reversing the current direction of the electromagnet, the movable element 2 supported by the elastic coupling body 3 is reciprocated by a magnetic attractive force or a repulsive force acting between the permanent magnet 5 and the electromagnet. The drive can be performed with a vibration phase shifted by 180 °.

Each mover 2 is projecting driver elements 11, or attached to the movable blade for a reciprocating electric shaver in driver elements 11, for example, by or attached to a reciprocating cutter of an electric hair clipper, the vibration of this example The type linear actuator can be used as a drive source for a reciprocating electric cutting instrument such as a reciprocating electric shaver or electric clipper.

  The connecting body 3 is a leaf spring disposed so that its flat surface is perpendicular to the alignment surface of the mover 2, and is formed in a straight line in a direction perpendicular to the alignment surface of the mover 2. An axial center portion 3a and a spiral connecting piece 3b extending from the axial center portion 3a so as to draw line symmetry on both sides are provided. Adhering portions 3c are provided at the tips of the connecting pieces 3b on both sides, and the movable member 2 and the connecting body 3 are connected to each other by fixing the end surface of the movable member 2 in the reciprocating direction A to the adhering portion 3c. In addition, a protruding shaft support 3d is provided on one end (lower end in the illustrated example) side of the shaft center part 3a, and a fixing portion 3e is provided on the other end (upper end in the illustrated example) side. 4 is fixed to the upper end portion (upper member 4b before assembly in FIG. 2) and the shaft support portion 3d is supported on the lower end portion of the chassis 4 (lower member 4c before assembly in FIG. 2). Thus, the connecting body 3 is connected to the chassis 4. The shaft support portion 3d of the coupling body 3 is rotatably fitted in a hole portion 4a recessed in the chassis 4 via a receiving member 7 made of a resin having a small sliding resistance.

  The connecting body 3 connected to the chassis 4 with the above configuration causes torsional elastic deformation in the shaft center portion 3a between the fixing portion 3e and the shaft support portion 3d, thereby centering the rotation center axis C passing through the shaft center portion 3a. It is possible to rotate as. Further, the connecting pieces 3b having a spiral shape on both sides are elastically deformed in the reciprocating direction A of the movable element 2. When the pair of movable elements 2 are driven to reciprocate with a vibration phase shifted by 180 °, the connecting body 3b. In conjunction with the reciprocating motion of the mover 2, the rotational motion at a substantially constant angle around the rotational center axis C is performed while switching between forward and reverse. When only the amplitude of one of the movers 2 is suddenly reduced due to a biased load on one of the movers 2, the connecting piece 3b connected to the mover 2 reciprocates. While being greatly elastically deformed in the moving direction A, the restoring force for restoring the deformation acts as a force for preventing only one amplitude from decreasing. Thereby, only one of the pair of movable elements 2 is prevented from decreasing in amplitude, and a balanced amplitude amount can be obtained.

  As described above, the coupling body 3 that couples the movable elements 2 is coupled to the chassis 4 in a rotatable state to prevent only one of the amplitudes from decreasing. However, the coupling body 3 serves to adjust the amplitude amount. In addition, the movable element 2 also has a role of supporting each movable element 2 at a position facing the stator 1 with a predetermined gap. That is, according to the vibration type linear actuator of this example, it is not necessary to prepare a member for supporting the mover 2 and a member for adjusting the amplitude amount and to assemble them separately, so that compactness and cost reduction can be achieved. It is intended.

  Moreover, since the connecting body 3 of this example is fixed to the chassis 4 via the fixing portion 3e, the shaft center portion 3a particularly acts as a torsion spring, and this torsion spring has a large elastic energy per unit volume. Therefore, the spring constant of the portion of the connecting piece 3b that acts as a bending spring is small, and the whole connecting body 3 can be made compact.

  Further, in this example, the rotation center axis C of the coupling body 3 is an axis perpendicular to the alignment surface of the movable element 2, and the coupling body 3 is formed in line symmetry with respect to this axis. Since the movable elements 2 are connected to the symmetrical portions on both sides of the axis C, the rotational movement of the connecting body 3 interlocked with the reciprocating movement of the movable elements 2 with a vibration phase shifted by 180 ° is smooth. Will be done. In addition, the connecting portion between the connecting body 3 and the chassis 4 is the two portions of the shaft support portion 3d and the fixing portion 3e that are both end portions on the rotation center axis C of the connecting body 3, so that the shaft shake during the rotational motion is caused. This suppresses the generation of stress in the connector 3 and improves the reliability. In addition, as shown in the figure, a pair of connecting bodies 3 are prepared, and the movable elements 2 are connected to each other at both ends in the reciprocating direction A via the connecting bodies 3 so that only one of the movable elements 2 is connected. The amplitude reduction is more reliably prevented.

  Next, the vibration type linear actuators of the second to seventh examples in the embodiment of the present invention will be described with reference to the drawings. In any vibration type linear actuator, the vibration type linear actuator of the first example described above and Since the basic configuration is the same, the description of the configuration that matches the first example will be omitted, and the characteristic configuration different from the first example will be described in detail.

  First, FIG. 3 shows a vibration type linear actuator of a second example according to the embodiment of the present invention. In this example, a hole portion in which a shaft support portion 3d having a protruding shape is recessed in the chassis 4 is shown. The coupling body 3 is pivotally supported by being rotatably fitted in 4a. That is, in this example, since it is not necessary to provide the receiving member 7 as in the first example, the number of parts is reduced.

  FIG. 4 shows the vibration type linear actuator of the third example according to the embodiment of the present invention. In this example, the shaft support part 3d of the coupling body 3 and the hole part of the chassis 4 as in the first example are shown. 4a is not provided, and the end opposite to the fixing portion 3e of the axial center portion 3a of the connecting body 3 is slidably placed on the lower end portion of the chassis 4 in the drawing. A stopper 4d for preventing the connecting body 3 from moving in the reciprocating direction A is projected from the lower end portion of the chassis 4, and the connecting body 3 can rotate in directions other than the reciprocating direction A. It is connected to the chassis 4 so as to be rotatable about the central axis C. Therefore, when the position of the mover 2 varies, the end of the coupling body 3 on the side where it is placed on the chassis 4 slides accordingly to move the rotation center axis C to an appropriate inclination. (Inclination in the reciprocating direction A is prevented by the stopper 4d), and the generation of stress in the connecting body 3 is effectively suppressed to improve the reliability.

  5 and 6 show a fourth example of the vibration type linear actuator in the embodiment of the present invention. In this example, the connecting body 3 does not include the shaft center part 3a and the fixing part 3e as in the first example, and the main body is formed by the connecting pieces 3b and the shaft support parts 3d on both sides. In other words, the connecting body 3 of this example is a leaf spring arranged so that its flat surface is perpendicular to the alignment surface of the mover 2, and both connecting pieces 3b are connected in a single stroke and protruded at the center of the lower end. A line-symmetric shape provided with a shaft support portion 3d. In this example, the connecting body 3 is rotatably connected to the chassis 4 only by supporting the shaft supporting part 3d to the lower end of the chassis 4 via the receiving member 7, and in the first example, Thus, since it is not necessary to secure a space for fixing the coupling body 3 to the chassis 4, a compact design can be achieved.

  7 and 8 show a fifth example of the vibration type linear actuator in the embodiment of the present invention. In this example, the connecting body 3 does not include the shaft support portion 3d as in the first example, and the connecting body 3 is connected to the chassis 4 only by fixing the fixing portion 3e to the upper end portion of the chassis 4 in the drawing. Yes. Even in this case, the connecting body 3 can be rotated about the rotation center axis C by causing torsional elastic deformation in the shaft center portion 3a, and the connecting body 3 is connected to the chassis 4 as in the first example. Since it is not necessary to secure a space for pivotally supporting the actuator, it is possible to reduce the size.

  9 and 10 show a sixth example of the vibration type linear actuator in the embodiment of the present invention. In this example, both support portions 3d are provided at both end portions on the rotation center axis C of the connection body 3, and both connection portions 3d are supported by the chassis 4 via the receiving member 7 so that the connection body 3 is It is connected to the chassis 4 so as to be rotatable about the rotation center axis C. In other words, the coupling body 3 of this example is supported by the chassis 4 at two portions on the rotation center axis C, so that the rotational motion can be smoothly performed without causing shaft shake, thereby improving the reliability. It is a thing.

  11 and 12 show a vibration type linear actuator of a seventh example according to the embodiment of the present invention. The coupling body 3 of this example is a leaf spring arranged so that its flat surface is perpendicular to the alignment surface of the mover 2, and the axial center portion 3 a is parallel to the alignment surface of the mover 2. In addition, it is provided in a straight line in a direction perpendicular to the reciprocating direction A, and a spiral connecting piece 3b is extended from both ends of the axial center portion 3a in the same direction (upward in the illustrated example). . At both ends of the shaft center portion 3a, shaft support portions 3d projecting in the direction of the tip are provided, and the shaft support portions 3d are supported by the chassis 4 via the receiving members 7 so that the connecting body 3 is fixed. It is connected to the chassis 4 in a rotatable state. Therefore, the rotation center axis C of the coupling body 3 in this example is an axis passing through the axial center portion 3a, that is, an axis parallel to the alignment surface of the mover 2 and perpendicular to the reciprocating direction A. Since the fixing portion 3c provided at the tip of the connecting piece 3b is positioned in the same radial direction (upward in the illustrated example) around the rotation center axis C, the movable portion connected to each fixing portion 3c. When the child 2 is reciprocally driven with a vibration phase shifted by 180 °, the connecting pieces 3b on both sides are elastically deformed in the reciprocating direction A in conjunction with the mover 2, and the shaft portion 3a is twisted in the forward and reverse directions to be elastically deformed. Repeatedly. Here, the axial center part 3a of the coupling body 3 of this example works as a torsion spring with the rotation center axis C as the center, and the torque generated in the torsional direction during driving reduces only the amplitude of one of the movers 2. By acting as a torque to prevent this, a balanced amplitude amount can be obtained.

In the vibration type linear actuator of each example described above, a chassis 4 for holding the stator 1 is provided, and the chassis 4 and the stator 1 form a stationary body 10, and the chassis 10 side portion of the stationary body 10 is formed. While using the ligated the connecting body 3 structure is not limited thereto, and ligated to a rotatable state the connecting member 3 in the stator 1 side portion of the fixed body 10 in the same axial supporting and anchoring structure Alternatively, a structure in which the connecting body 3 is rotatably connected between a portion on the chassis 4 side of the fixed body 10 and a portion on the stator 1 side, or the stator 1 without the chassis 4 being provided. It is good also as a structure which connected the connection body 3 in the state which can be rotated by the same axial support or fixation to the fixed body 10 formed only by these.

It is a perspective view of the vibration type linear actuator of the 1st example in an embodiment of the invention. It is a disassembler's view of a vibration type linear actuator same as the above. It is a perspective view of the vibration type linear actuator of the 2nd example in an embodiment of the invention. It is a perspective view of the vibration type linear actuator of the 3rd example in an embodiment of the invention. It is a perspective view of the vibration type linear actuator of the 4th example in an embodiment of the invention. It is a side view of a vibration type linear actuator same as the above. It is a perspective view of the vibration type linear actuator of the 5th example in an embodiment of the invention. It is a side view of a vibration type linear actuator same as the above. It is a perspective view of the vibration type linear actuator of the 6th example in an embodiment of the invention. It is a side view of a vibration type linear actuator same as the above. It is a perspective view of the vibration type linear actuator of the 7th example in an embodiment of the invention. It is a side view of a vibration type linear actuator same as the above. It is a perspective view which shows the prior art example of a vibration type linear actuator. It is a perspective view which shows another prior art example of a vibration type linear actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Movable element 3 Connection body 4 Chassis 10 Fixed body A Reciprocating direction C Center axis of rotation

Claims (6)

  In a vibration type linear actuator that reciprocally drives a plurality of movers relative to a stator, the mover is connected by a connecting body that elastically deforms in the reciprocating direction of the mover, and the stator or a chassis that holds the stator is fixed. A vibratory linear actuator characterized in that a body and a coupling body are coupled so that the coupling body is rotatable.   2. The vibration type linear actuator according to claim 1, wherein the connecting body and the fixed body are connected by fixing, and the connecting body can be rotated relative to the fixed body by torsional elastic deformation of the connecting body. .   2. The vibration type linear actuator according to claim 1, wherein the connecting body is pivotally supported by the fixed body to connect the both so that the connecting body can rotate with respect to the fixed body. The vibration type linear actuator according to any one of claims 1 to 3, wherein the movers are connected to each other by a connecting body at both ends of the mover in the reciprocating direction. The vibration type linear actuator according to any one of claims 1 to 4, wherein the connecting body and the fixed body are connected at two portions on the rotation center axis of the connecting body. A reciprocating mechanism characterized in that the vibration type linear actuator according to any one of claims 1 to 5 is used as a driving source, and a movable blade for a reciprocating electric shaver or a reciprocating blade for an electric hair clipper is connected to a movable element. Type electric cutting instrument.

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