Motor-driven instrument

Abstract

To provide a motor-driven instrument having a head part that can swing and can be replaced.SOLUTION: A motor-driven instrument 100 includes: a body part 10 including a motor 11; a head part 20 including a drive blade 23 that is driven by the motor 11, capable of swinging with respect to the body part 10, and engaging with the body part 10; and a power transmission mechanism for transmitting power of the motor 11 to the drive blade and capable of being divided into a plurality of portions. The head part 20 is configured to be dividable from the body part 10 when the power transmission mechanism is divided into the plurality of portions.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric tool, and more particularly to an electric tool having a head portion that can swing relative to a main body. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known an electric tool in which a head portion is swingable relative to a main body portion (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses an electric tool in which a head portion can swing relative to a main body portion. In Patent Document 1, the main body portion includes a motor and a part of a drive mechanism that converts rotation of the motor shaft into reciprocating linear motion. In Patent Document 1, the drive mechanism also includes a pinion gear press-fitted onto the motor shaft and a face gear that meshes with the pinion gear and has a rotation axis perpendicular to the motor shaft. The drive mechanism also includes a first drive pestle having a fitting hole that is fitted to an eccentric boss provided on the face gear so as to be rotatable relative to the face gear, and a second drive pestle that is fitted to the first drive pestle so as to be swingable (oscillating). When the second drive pestle swings relative to the first drive pestle, the head portion swings relative to the main body portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-334370 Summary of the Invention [Problem to be solved by the invention]

[0005] In the electric tool described in Patent Document 1, the head unit can swing relative to the main body unit. On the other hand, in conventional electric tools such as the one described in Patent Document 1, it is not possible to replace the old head unit with a new head unit or to attach a different type of head unit. For this reason, there is a demand for an electric tool with a swingable and replaceable head unit so that it is possible to replace the old head unit with a new head unit or to attach a different type of head unit.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide an electric tool having a head portion that is oscillating and has a replaceable head portion. [Means for solving the problem]

[0007] An electric tool according to one aspect of the present invention comprises a main body including a motor, a head including a drive blade driven by the motor and capable of swinging relative to the main body and engaging with the main body, and a power transmission mechanism that can be separated into multiple parts and transmits the power of the motor to the drive blade, and the head is configured to be separable from the main body by dividing the power transmission mechanism into multiple parts.

[0008] In one aspect of the electric tool of the present invention, the head portion is pivotable relative to the main body portion, and the electric tool includes a power transmission mechanism that can be separated into multiple parts and transmits power from the motor to the drive blade. This allows the power transmission mechanism to be separated, so the main body portion and the head portion can be separated at the separated parts of the power transmission mechanism. As a result, the head portion can be pivoted and replaced.

[0009] In the electric tool according to this aspect, the power transmission mechanism preferably further includes an engaging portion, and the engaging portion is configured to be separable from the other engaging portion. With this configuration, the power transmission mechanism can be easily separated at the engaging portion, making it easy to separate the main body and the head.

[0010] In this case, the power transmission mechanism preferably includes a motor rotational motion transmission mechanism and a conversion mechanism that converts the motor rotational motion into reciprocating linear motion, and the head unit and the main body unit can be separated by separating the conversion mechanism at a motor-side engaging portion that engages with the motor or a conversion mechanism engaging portion that is provided midway through the conversion mechanism. With this configuration, the power conversion mechanism can be separated at the motor-side engaging portion or the conversion mechanism engaging portion, making it easy to separate the main body unit and the head unit.

[0011] In the electric tool including the motor-side engaging portion and the conversion mechanism engaging portion, the conversion mechanism preferably includes a circular motion conversion mechanism that converts the rotational motion of the motor into circular motion, and a reciprocating linear motion conversion mechanism that converts circular motion into reciprocating linear motion and that engages with the circular motion conversion mechanism in a separable manner via the conversion mechanism engaging portion. With this configuration, the circular motion conversion mechanism and the reciprocating linear motion conversion mechanism are separably engaged with each other, so that the main body and the head of the electric tool having the conversion mechanism that converts circular motion into reciprocating linear motion can be easily separated.

[0012] In the electric tool according to the above aspect, the head portion preferably further includes a head swinging portion on which the drive blade is provided and a head holding portion that swingably holds the head swinging portion, thereby allowing the head portion to swing relative to the main body portion, and the head holding portion further includes a biasing member that biases the head swinging portion toward the tip of the head portion so that the head swinging portion maintains a neutral position relative to the main body portion. With this configuration, the biasing force of the biasing member presses the head swinging portion toward the tip of the head portion, so that the neutral position can be maintained by the biasing force of the biasing member. Furthermore, because the swing of the head swinging portion acts in a direction that pushes back the biasing member, the neutral position can be maintained by the restoring force of the biasing member.

[0013] In this case, the biasing member preferably includes a compression coil spring, and the power transmission mechanism is configured to pass through the space inside the compression coil spring. With this configuration, the power transmission mechanism passes through the dead space inside the compression coil spring, making it possible to create a compact electric tool.

[0014] In the electric tool including the biasing member, preferably, the head swinging portion further includes one of an engaging protrusion and an engaging recess, and the head holding portion further includes the other of the engaging protrusion and engaging recess that engages with the one of the engaging protrusion and engaging recess of the head swinging portion so as to be swingable in the first swing direction. With this configuration, the swingably engaged engaging protrusion and engaging recess make it possible to easily swing the head swinging portion relative to the head holding portion.

[0015] In this case, preferably, the engaging protrusion includes an outer edge portion formed by an arc-shaped portion when viewed from the swing axis direction and a straight portion connecting the ends of the arc-shaped portion, and the engaging recess includes a flat portion, and when the engaging protrusion is in a swingable state, the straight portion of the outer edge of the engaging protrusion is pressed against the flat portion in the direction of the rotation axis of the motor by the biasing member, thereby maintaining the head swinging portion in a neutral position. With this configuration, the straight portion of the outer edge of the engaging protrusion is pressed against the flat portion in the direction of the rotation axis of the motor by the biasing force of the biasing member, making it easy to assume and maintain the neutral position.

[0016] In the electric tool including an outer edge portion formed by an arc-shaped portion and a straight portion connecting the ends of the arc-shaped portion when viewed from the swing axis direction, preferably, a pair of engaging recesses are provided at positions opposite to each other, and one of the pair of engaging recesses at opposite positions has a longer length in the direction of the rotation axis of the motor than the other, so that the head swinging portion is configured to swing in a second swing direction along the direction of the rotation axis around the other engaging recess. With this configuration, swinging in the second swing direction can be performed in addition to swinging in the first swing direction, thereby further improving the ability of the driving blade of the electric tool to follow the skin. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing an overall view of a powered tool according to an embodiment of the present invention; [Figure 2] 1A is a view showing an electric tool according to an embodiment of the present invention, in which the electric tool is divided into a head part and a main body part, as viewed from the Z direction, and FIG. 1B is a view showing the divided head part as viewed from the Y direction. [Figure 3] 1 is a cross-sectional view of a body portion according to one embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of a head portion according to an embodiment of the present invention. [Figure 5] 1A is a cross-sectional view of a head swinging portion and a head holding portion according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of the head swinging portion according to an embodiment of the present invention. [Figure 6] 3 is a cross-sectional view of a head swinging portion and a head holding portion according to an embodiment of the present invention. FIG. [Figure 7] 1A is a view showing an engagement recess in a neutral position according to an embodiment of the present invention, (b) is a view showing one of a pair of engagement recesses, and (c) is a view showing the other of the pair of engagement recesses. [Figure 8] 8(a) is a diagram showing the state of the engaging recess and engaging protrusion when pivoted in a first pivot direction according to one embodiment of the present invention, and (b) is a partially enlarged view of FIG. [Figure 9] FIG. 10 is a cross-sectional view of an engagement portion between a bell crank and an eccentric pin according to one embodiment of the present invention. [Figure 10] 10(a) is a diagram showing the state of the engaging recess and the engaging protrusion at the neutral position according to one embodiment of the present invention, and (b) is a partially enlarged view of FIG. [Figure 11] 11(a) is a view showing the state of the engaging recess and engaging protrusion when pivoted in a second pivot direction according to one embodiment of the present invention, and (b) is a partially enlarged view of FIG. [Figure 12] FIG. 10 is a diagram showing an electric appliance according to a first modified example of an embodiment of the present invention. [Figure 13]FIG. 10 is a diagram showing an electric appliance according to a second modified example of an embodiment of the present invention. [Figure 14] 14(a) is a diagram showing the state of the engaging recess and the engaging protrusion at the neutral position according to a third modified example of the embodiment of the present invention, and (b) is a partially enlarged view of FIG. [Figure 15] 15(a) is a view showing a state of the engaging recess and the engaging protrusion when pivoted in a second pivot direction according to a third modified example of the embodiment of the present invention, and (b) is a partially enlarged view of FIG. [Figure 16] FIG. 10 is a diagram showing an electric appliance according to a fourth modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] (Configuration of electric appliances) The configuration of an electric tool 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 6. In the following, the direction along the shaft 13 of the motor 11 (see Figure 3) is defined as the X direction, the direction along the swing axis B, which is the swing axis of the head unit 20 that swings in a first swing direction R1 (see Figure 8), is defined as the Y direction, and the direction perpendicular to the X direction and the Y direction is defined as the Z direction. In addition, in the X direction, the main body 10 side of the electric tool 100 is defined as one side of the X direction, and the head unit 20 side of the electric tool 100 is defined as the other side of the X direction (see Figure 1). In the Y direction, the drive blade 23 side of the electric tool 100 is defined as one side of the Y direction, and the side opposite the drive blade 23 is defined as the other side of the Y direction (see Figure 1). In the Z direction, the right side of the paper in Figure 7 is defined as one side of the Z direction, and the left side of the paper in Figure 7 is defined as the other side of the Z direction. In each drawing, the direction indicated by the arrows indicating the X, Z, and Y directions is one side, and the opposite side is the other side.

[0020] As shown in Fig. 1, the electric tool 100 according to this embodiment includes a main body 10 and a head 20. As shown in Fig. 2, the main body 10 and the head 20 are configured to be separable.

[0021] Furthermore, as shown in FIG. 2, a groove 22 that can engage with the protrusion 14 of the main body 10 is formed on the head 20 on the main body 10 side. After engaging the protrusion 14 of the main body 10 with the groove 22 of the head 20, the head 20 can be rotated relative to the main body 10 with the X direction as the axis of rotation, thereby joining the main body 10 and the head 20.

[0022] In this embodiment, as shown in Fig. 3, the main body 10 includes a motor 11 and a rotational motion transmission mechanism 12 connected to a shaft 13 of the motor 11. The rotational motion transmission mechanism 12 has a recess 12a that can engage with a bottom 21a of an eccentric pin 21 (see Fig. 4) described below. The bottom 21a of the eccentric pin 21 and the recess 12a that can engage with the bottom 21a of the eccentric pin 21 are an example of a "motor-side engagement portion" in the claims. The rotational motion transmission mechanism 12 is a mechanism that transmits the rotation of the motor 11 to the eccentric pin 21 described below.

[0023] As shown in FIG. 4, the head portion 20 includes a head swinging portion 20a and a head holding portion 20b that holds the head swinging portion 20a swingably about a swing axis B.

[0024] 5, head swinging portion 20a has driving blade 23 driven by motor 11, driven body 24 connected to driving blade 23, bell crank 25 rotatably engaged with driven body 24, and engaging recess 28 rotatably engaged with head holding portion 20b. Bell crank 25 is an example of the "reciprocating linear motion conversion mechanism" in the claims.

[0025] As shown in Fig. 6, head holding portion 20b has a compression coil spring 26 that biases head swing portion 20a toward the tip of head portion 20, an eccentric pin 21 that is disposed to penetrate the internal space of compression coil spring 26 and engages with bell crank 25, and an engaging protrusion 27 that swingably engages with head swing portion 20a. Note that eccentric pin 21 is an example of a "circular motion conversion mechanism" in the claims. Also, compression coil spring 26 is an example of a "biasing member" in the claims.

[0026] The rotational motion transmission mechanism 12, the eccentric pin 21 separably engaged with the rotational motion transmission mechanism 12, the bell crank 25 engaged with the eccentric pin 21, and the driven body 24 are an example of the "power transmission mechanism" in the claims.

[0027] (Configuration for swinging in the first swing direction) 7 to 9, the configuration regarding the swing of the head portion 20 in the first swing direction R1 will be described.

[0028] As shown in FIG. 7, the engaging protrusion 27 (see FIGS. 7(b) and 7(c)) provided on the head holding portion 20b (see FIG. 7(a)) includes an outer edge portion constituted by an arc-shaped portion 27a when viewed from the Y direction along the oscillation axis B, which is the axis about which the head portion 20 oscillates, and a straight portion 27b connecting the ends of the arc-shaped portion 27a. The engaging recess 28 includes an engaging recess 281 provided on one side in the Y direction shown in FIG. 7(b) and an engaging recess 282 provided on the other side in the Y direction. The engaging recesses 281 and 282 provided on the head oscillating portion 20a each have flat portions 281b and 282b having the same length L1 in the Z direction as the straight portion 27b of the engaging protrusion 27. Furthermore, the engaging recess 281 includes an arc-shaped portion 281a having a length L221 in the X direction that is larger than the length L21 in the X direction of the engaging protrusion 27, and the engaging recess 282 includes an arc-shaped portion 282a having a length L222 in the X direction that is larger than the length L21 in the X direction of the engaging protrusion 27. Here, the length L222 is larger than the length L221.

[0029] In the neutral position, the head swinging portion 20a is biased toward the other side in the X direction by the compression coil spring 26. Therefore, the flat portion 281b (282b) of the engagement recess 281 (282) provided in the head swinging portion 20a is pressed toward one side in the X direction against the linear portion 27b of the engagement protrusion 27 provided in the head holding portion 20b. At this time, the engagement recess 281 (282) and the engagement protrusion 27 each have the flat portion 281b (282b) and the linear portion 27b, and since the flat portion 281b (282b) is pressed against the linear portion 27b, when no external force is applied to the head swinging portion 20a, the biasing force of the compression coil spring 26 stably positions the head swinging portion 20a in the neutral position. The neutral position refers to a position where the head swinging part 20a stands along the X direction and does not swing in the first swing direction R1.

[0030] As shown in Fig. 8(a), during swinging in the first swing direction R1, as shown in Fig. 8(b), the arc-shaped portion 27a of the engaging protrusion 27 provided on the head holding part 20b slides on the arc-shaped portion 281a (282a) of the engaging recess 281 (282) provided on the head swinging part 20a, causing the head swinging part 20a to swing in the R1 direction. Also, unlike when the engaging recess 28 and the engaging protrusion 27 are circular, the engaging recess 281 (282) has a flat portion 281b (282b) and the engaging protrusion 27 has a straight portion 27b. Therefore, as the swing angle increases, the flat portion 281b (282b) and the straight portion 27b interfere with each other, suppressing swinging beyond a certain angle, as shown in Fig. 8(b). Here, the fixed angle at which the swinging is suppressed is determined by the relationship between the shapes of the engaging protrusion 27 and the engaging recess 281 (282), and for example, the swingable range in the first swinging direction is 10 degrees on each side of the Z direction.

[0031] As shown in Figure 9, the engagement position between bell crank 25 and eccentric pin 21 is at a position where oscillation axis B of the oscillation in first oscillation direction R1 passes, and bell crank 25 does not restrict the oscillation of eccentric pin 21 in first oscillation direction R1, so the movement of motor 11 transmitted from eccentric pin 21 is transmitted to driven body 24 without interfering with the oscillation in first oscillation direction R1.

[0032] (Configuration for swinging in the second swing direction) The configuration relating to the swing of the head portion 20 in the second swing direction R2 will be described.

[0033] 10(b), the pair of engagement recesses 281 and 282 provided on the head swinging portion 20a are provided on opposite sides in the Y direction, i.e., on one side and the other side in the Y direction. Furthermore, the flat portion 281b of the engagement recess 281 and the flat portion 282b of the engagement recess 282 are provided at the same position in the X direction. Meanwhile, with respect to the arc-shaped portions 281a and 282a, the arc-shaped portion 282a is longer toward the other side in the X direction, which is the tip side of the head portion 20.

[0034] In the neutral position, the head swinging portion 20a is biased toward the other side of the X direction by the compression coil spring 26. Therefore, the flat portions 281b and 282b of the engagement recess 28 provided in the head swinging portion 20a are pressed against the linear portion 27b of the engagement protrusion 27 provided in the head holding portion 20b in the direction along the X direction, toward one side of the X direction, which is the main body portion 10 side. Therefore, when no external force is applied to the head swinging portion 20a, the head swinging portion 20a stably assumes the neutral position.

[0035] Next, as shown in FIG. 11(b), the arc-shaped portion 281a of the engagement recess 281 and the arc-shaped portion 282a of the engagement recess 282 are longer toward the tip of the head unit 20. Therefore, the head swing unit 20a can swing from the X direction to the other side in the Y direction. Also, as shown in FIG. 7(b), in order to enable the head unit 20 to swing in the first swing direction R1 relative to the main body unit 10, the arc-shaped portion 281a of the engagement recess 281 is longer toward the other side in the X direction than the arc-shaped portion 27a of the blade-side engagement protrusion 27. Therefore, the engagement protrusion 27 on one side in the Y direction has a smaller degree of freedom in the X-axis direction than the engagement protrusion 27 on the other side in the Y direction. Therefore, the head swing unit 20a can swing slightly more toward one side in the Y direction than toward the other side in the Y direction. That is, the head swinging portion 20a swings in the second swing direction R2. The swingable range in the second swing direction is determined by the relationship between the shapes of the engaging protrusions 27 and the engaging recesses 281 on one side in the Y direction and the relationship between the shapes of the engaging protrusions 27 and the engaging recesses 281 on the other side in the Y direction, and is, for example, 0.5 degrees in one direction in the Y direction and 3 degrees in the other direction.

[0036] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0037] As described above, this embodiment includes the main body 10 including the motor 11, the head 20 including the drive blade 23 driven by the motor 11, which is pivotable relative to the main body 10 and engages with the main body 10, and a power transmission mechanism that can be separated into multiple parts and transmits the power of the motor 11 to the drive blade 23, which includes the rotational motion transmission mechanism 12, the eccentric pin 21, the bell crank 25, and the driven body 24. The head 20 is configured to be separable from the main body 10 by being separated into multiple parts by the rotational motion transmission mechanism 12 and the eccentric pin 21 of the power transmission mechanism. As a result, the head 20 is pivotable relative to the main body 10, and the power transmission mechanism can be separated, so that the main body 10 and the head 20 can be separated at the separated part of the power transmission mechanism. As a result, the head 20 is pivotable and can be replaced.

[0038] Furthermore, in this embodiment, as described above, the power transmission mechanism includes the rotational motion transmission mechanism 12, the eccentric pin 21, and the driven body 24. The recess 12a of the rotational motion transmission mechanism 12 and the bottom 21a of the eccentric pin 21 are engaged as an engaging portion, thereby enabling the mechanism to be separated from each other. With this configuration, the power transmission mechanism can be easily separated at the engaging portion, and therefore the main body 10 and the head 20 can be easily separated.

[0039] Furthermore, in this embodiment, as described above, the power transmission mechanism includes the rotational motion transmission mechanism 12 of the motor 11 and a conversion mechanism that converts the rotational motion of the motor into reciprocating linear motion, which is composed of the bell crank 25 and the eccentric pin 21. The head unit 20 and the main body unit 10 can be separated by separating the conversion mechanism at a motor-side engaging portion that engages with the motor, or at a conversion mechanism engaging portion that is provided midway through the conversion mechanism. This allows the power conversion mechanism to be separated at the motor-side engaging portion or the conversion mechanism engaging portion, making it easy to separate the main body unit 10 and the head unit 20.

[0040] Furthermore, in this embodiment, as described above, the conversion mechanism includes eccentric pin 21 as a circular motion conversion mechanism that converts the rotational motion of the motor into circular motion, and bell crank 25 as a reciprocating linear motion conversion mechanism that converts circular motion into reciprocating linear motion and that engages with the circular motion conversion mechanism via the conversion mechanism engagement portion in a manner that allows the two to be separated. As a result, since the circular motion conversion mechanism and the reciprocating linear motion conversion mechanism are engaged with each other in a manner that allows the two to be separated, the main body 10 and the head 20 can be easily separated in an electric tool that has a conversion mechanism that converts circular motion into reciprocating linear motion.

[0041] In this embodiment, as described above, the head unit 20 further includes a head swinging unit 20a on which the drive blade 23 is provided, and a head holding unit 20b that swingably holds the head swinging unit 20a, thereby allowing the head unit 20 to swing relative to the main body 10. The head holding unit 20b further includes a compression coil spring 26 that biases the head swinging unit 20a toward the other side in the X direction, i.e., the tip side of the head unit 20, so that the head swinging unit 20a maintains a neutral position relative to the main body 10. As a result, the biasing force of the compression coil spring 26 presses the head swinging unit 20a toward the other side in the X direction, thereby allowing the neutral position to be maintained by the biasing force of the compression coil spring 26. Furthermore, the swinging of the head swinging unit 20a applies a force in a direction that pushes back the compression coil spring 26, allowing the neutral position to be maintained by the restoring force of the compression coil spring 26.

[0042] Furthermore, in this embodiment, as described above, the compression coil spring 26 includes the compression coil spring 26, and the power transmission mechanism is configured to pass through the space inside the compression coil spring 26. As a result, the power transmission mechanism passes through the space inside the compression coil spring 26 that would otherwise be dead space, and therefore the electric tool 100 can be made compact.

[0043] Furthermore, in this embodiment, as described above, the head swinging portion 20a further includes one of the engaging protrusions 27 or the engaging recesses 28, and the head holding portion 20b further includes the other of the engaging protrusions 27 or the engaging recesses 28 that swingably engage with one of the engaging protrusions 27 or the engaging recesses 28 of the head swinging portion 20a in the first swing direction R1. This allows the head swinging portion 20a to easily swing relative to the head holding portion 20b by the swingably engaged engaging protrusions 27 and the engaging recesses 28.

[0044] In this embodiment, as described above, the engaging protrusion 27 includes an outer edge portion configured by an arc-shaped portion 27a when viewed from the swing axis direction and a straight portion 27b connecting the ends of the arc-shaped portion 27a. The engaging recess 281 (282) includes a flat portion 281b (282b). When the engaging protrusion 27 is swingable, the straight portion 27b of the outer edge portion of the engaging protrusion 27 is pressed against the flat portion 281b (282b) in the direction of the rotation axis of the motor 11 by the biasing force of the compression coil spring 26, thereby maintaining the head swinging portion 20a in a neutral position. As a result, the straight portion 27b of the outer edge portion of the engaging protrusion 27 is pressed against the flat portion 281b (282b) in the direction of the rotation axis of the motor by the biasing force of the compression coil spring 26, making it easy to assume and maintain the neutral position.

[0045] Furthermore, in this embodiment, as described above, a pair of engagement recesses 28 are provided, one on one side in the Y direction, and the length L222 of one engagement recess 282 of the pair of engagement recesses 28 arranged at opposite positions in the direction of the rotational axis of the motor 11 is longer than the length L221 of the other engagement recess 281, so that the head swinging part 20a is configured to be swingable in a second swinging direction R2 along the direction of the rotational axis about the other engagement recess 28. This allows swinging in the second swinging direction R2 in addition to swinging in the first swinging direction R1, thereby further improving the ability of the drive blade 23 of the electric tool 100 to follow the skin.

[0046] It should be noted that the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims.

[0047] For example, in the above embodiment, an example was shown in which the power transmission mechanism is divided by the engaging portion, but the present invention is not limited to this. The power transmission mechanism may be divided at a portion other than the engaging portion.

[0048] In the above embodiment, an example was shown in which the bottom 21a of the eccentric pin 21, which is the motor-side engaging portion, and the recess 12a of the rotational motion transmission mechanism 12 are separable, but the present invention is not limited to this. It is sufficient that the head unit 20 and the main body unit 10 are separable, and they may be separable at the engaging portion on the driven body 24 side.

[0049] In the above embodiment, an example was shown in which eccentric pin 21 is disposed inside head holding portion 20b and bottom portion 21a of eccentric pin 21 engages with a recess provided in rotational motion transmission mechanism 12, but the present invention is not limited to this. As shown in Fig. 12, eccentric pin 21 may be fixed to rotational motion transmission mechanism 12, or shaft 13 of motor 11 itself may serve as rotational motion transmission mechanism 12, with eccentric pin 21 directly fitted to shaft 13 of motor 11. In this case, the dividing position of the power transmission mechanism is the engagement portion between eccentric pin 21 and bell crank 25.

[0050] In addition, in the above embodiment, an example was shown in which the head swinging portion 20a swings relative to the main body portion 10, but the present invention is not limited to this. If the head portion 20 and the main body portion 10 are separable, a swing shaft may be provided in the main body portion.

[0051] In addition, in the above embodiment, an example was shown in which the compression coil spring 26 was used as the biasing member, but the present invention is not limited to this. The biasing member does not have to be the compression coil spring 26 as long as it has a space inside so that the power transmission mechanism can pass through.

[0052] In the above embodiment, the head swinging portion 20a is provided with the engaging recess 28 and the head holding portion 20b is provided with the engaging protrusion 27, but the present invention is not limited to this. For example, the head swinging portion 20a may be provided with the engaging protrusion 27 and the head holding portion 20b may be provided with the engaging recess 28.

[0053] In the above embodiment, the shape of the engagement recess 281 (282) is configured to include the flat portion 281b (282b) and the arc-shaped portion 281a (282a), but the present invention is not limited to this. For example, as shown in Fig. 13, the shape of the engagement recess 300 may be a square or rectangular shape having a flat portion, as long as the engagement protrusion 27 is configured to be swingable.

[0054] In the above embodiment, the rotational motion transmission mechanism 12 is configured to simply transmit the rotation of the motor 11 to the eccentric pin 21, but the present invention is not limited to this. As long as the rotation of the motor 11 is transmitted to the eccentric pin 21, a reduction gear using a planetary gear mechanism may be used.

[0055] In the above embodiment, the arc-shaped portion 281a of the engagement recess 281 on one side in the Y direction and the arc-shaped portion 282a of the engagement recess 282 on the other side in the Y direction are elongated toward the other side in the X direction. However, the present invention is not limited to this. As shown in FIGS. 14 and 15 , the engagement recess 282 on one side in the Y direction can have the same shape as the engagement recess 282 on the other side in the Y direction. That is, as shown in FIG. 15 , the head swinging portion 120a can be swung in the second swing direction R2 by the same amount in both the one side in the Y direction and the other side in the Y direction. In this case, for example, the swingable range in the second swing direction is 3 degrees in both the one side and the other side in the Y direction, and the swing range in the one side in the Y direction can be increased.

[0056] In the above embodiment, the head unit 20 is configured on the front surface in the Y direction where the driving blade 23 is provided, but the present invention is not limited to this. For example, as shown in Fig. 16, a driving blade 123 can be provided on the other side in the Y direction other than the side in the Y direction where the driving blade 23 is provided. The head unit 220 is an example of a replaceable head. [Explanation of symbols]

[0057] 10 Main body 11 Motor 12 Rotational motion transmission mechanism 12a Rotational motion transmission mechanism recess 20, 120, 220 head 20a Head swinging part 20b Head holding part 21 Eccentric pin (circular motion conversion mechanism) 21a Eccentric pin bottom 23, 123 Drive blade 25 Bell crank (reciprocating linear motion conversion mechanism) 26 Compression coil spring (biasing member) 27 Engagement protrusion 28, 281, 282 Engagement recess 100 Electric appliances 281a, 282a arcuate part 281b, 282b flat part B Head swing shaft R1 First oscillation direction R2 Second oscillation direction

Claims

1. a main body including a motor; a head portion including a drive blade driven by the motor, the head portion being pivotable relative to the body portion and engaging with the body portion; a power transmission mechanism that can be divided into a plurality of parts and that transmits the power of the motor to the driving blade; An electric tool, wherein the head portion is configured to be separable from the main body portion by dividing the power transmission mechanism into multiple parts.

2. The electric tool according to claim 1 , wherein the power transmission mechanism further includes an engaging portion, and the engaging portion is configured to be separable from each other.

3. the power transmission mechanism includes a rotational motion transmission mechanism of the motor and a conversion mechanism that converts the rotational motion of the motor into reciprocating linear motion, The electric tool of claim 2, wherein the head portion and the main body portion are configured to be separable by being separated at a motor side engaging portion of the conversion mechanism that engages with the motor side, or at a conversion mechanism engaging portion that is provided midway through the conversion mechanism.

4. The electric tool of claim 3, wherein the conversion mechanism includes a circular motion conversion mechanism that converts the rotational motion of the motor into circular motion, and a reciprocating linear motion conversion mechanism that converts circular motion into reciprocating linear motion and that engages with the circular motion conversion mechanism via the conversion mechanism engagement portion in a manner that allows the two to be separated from each other.

5. the head portion further includes a head swinging portion on which the driving blade is provided, and a head holding portion configured to swingably hold the head swinging portion, thereby allowing the head portion to swing relative to the main body portion; The electric tool according to claim 1 , wherein the head holding portion further includes a biasing member that biases the head swinging portion toward the tip of the head portion so that the head swinging portion maintains a neutral position relative to the main body portion.

6. the biasing member includes a compression coil spring; The electric tool according to claim 5 , wherein the power transmission mechanism is configured to pass through a space inside the compression coil spring.

7. the head swinging portion further includes one of an engaging protrusion and an engaging recess, The electric tool according to claim 5, wherein the head holding portion further includes the other of the engaging protrusion or the engaging recess that engages with one of the engaging protrusion or the engaging recess of the head swinging portion so as to be swingable in a first swing direction.

8. the engaging protrusion includes an outer edge portion configured by an arc-shaped portion when viewed from the swing axis direction and a straight portion connecting the ends of the arc-shaped portion, The electric tool of claim 7, wherein the engagement recess includes a flat portion, and when the engagement protrusion is capable of swinging, the straight portion of the outer edge of the engagement protrusion is pressed against the flat portion in the direction of the rotational axis of the motor by the biasing force of the biasing member, thereby causing the head swinging portion to maintain the neutral position.

9. The engaging recesses are provided as a pair and are arranged at positions opposite to each other, An electric tool as described in claim 8, wherein the length of one of the pair of engagement recesses arranged at opposite positions in the direction of the rotational axis of the motor is longer than that of the other, so that the head oscillating portion is configured to be oscillatable in a second oscillating direction along the direction of the rotational axis with the other engagement recess as the center of rotation.

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