JP2014233794A - Reciprocation tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocation tool which achieves good operability during curved line cutting.SOLUTION: A jigsaw 1 of the invention includes: a motor 3; a plunger 55 which is driven by the motor in a reciprocating manner and detachably holds a blade 7; a base part 4 which stores the plunger 55; a housing 2 which houses the motor 3 and is rotatably connected with the base part 4; and a rotational motion transmission mechanism 6 which rotates the plunger 55 and the blade 7 in conjunction with rotations of the housing 2. Since the blade 7 is rotated by rotating the housing 2, good operability is achieved during curved line cutting.

Description

  The present invention relates to a reciprocating tool, and more particularly to a portable reciprocating tool that cuts a workpiece by reciprocating movement of a tip tool such as a blade.

  2. Description of the Related Art Conventionally, a reciprocating tool, for example, a jigsaw, includes a housing having a handle portion gripped by an operator, a base connected to the housing, a motor, a rotating portion that converts rotational driving of the motor into reciprocating motion, and a rotating portion. And a plunger that reciprocates and holds the blade detachably. In the jigsaw, the workpiece is cut by moving the blade up and down relative to the base portion (for example, Patent Document 1).

JP 2007-62052 A

  In the conventional jigsaw, since the distance between the handle portion and the blade is close, the rotational moment when the handle portion is rotated around the blade is difficult to be transmitted to the blade. For this reason, when carrying out the curve cutting work, a large force is required and workability is poor.

  Therefore, an object of the present invention is to provide a reciprocating tool with good operability for curve cutting.

  In order to solve the above-described problems, the present invention includes a drive source, a plunger that is reciprocally driven by the drive source and detachably holds a blade, a base portion that accommodates the plunger, and a handle portion. A reciprocating tool is provided, comprising: a housing rotatably connected to the portion; and a rotational motion transmission mechanism for rotating the plunger and the blade in conjunction with the rotation of the housing.

  According to such a configuration, the blade held by the plunger can be rotated in conjunction with the rotation of the housing. Thereby, a cutting direction can be changed easily and the operativity at the time of curve cutting improves.

  The housing accommodates the drive source, the drive source includes an output shaft that is rotationally driven, the reciprocating tool is accommodated in the base portion, and the rotational drive of the output shaft is used for the reciprocating drive. It is preferable that a motion conversion mechanism for converting and transmitting to the plunger is further provided, and the housing is rotatable about the output shaft.

  According to such a configuration, since the housing can be rotated with respect to the base portion around the output shaft, it is not necessary to displace the drive source and the output shaft in accordance with the rotation of the housing. Thereby, rotation with respect to the base part of a housing is realizable with simple structure.

  In addition, it is preferable to further include a switching unit capable of switching between an interlocking state that allows the rotation of the housing relative to the base portion and a normal state that restricts the rotation of the housing relative to the base portion.

  According to such a configuration, by switching the switching unit, it is possible to be in an interlocking state when an operation for changing the cutting direction is necessary, and to be in a normal state in an operation for cutting linearly. Thereby, the width | variety of the operation | work at the time of a cutting operation spreads.

  The blade includes a cutting portion that cuts a workpiece, and when projected onto a plane orthogonal to the axis of the plunger, the rotary motion transmission mechanism moves the cutting portion in the rotation direction of the housing. Thus, it is preferable to rotate the plunger.

  According to such a configuration, since the cutting part moves in the same direction as the rotation direction of the housing, if it is desired to turn to the right, the cutting part can be directed to the right side by rotating the housing to the right side. If it is desired to turn to the left, the cutting part can be directed to the left by rotating the housing to the left. Thereby, the feeling at the time of a worker's work improves.

  Also, a plunger support part that is accommodated in the base part and supports the plunger so as to be slidable and rotatable, a cam part accommodated in the base part and driven by the drive source, and the plunger by the cam part A roller holder that is rotated about a rotation axis that extends in a direction orthogonal to the axial direction of the blade, and that slidably supports the blade, and a tip portion of the blade has the rotation of the roller holder It is preferable to draw an elliptical locus by the reciprocating drive.

  According to such a configuration, the cutting performance of the blade is improved by providing a so-called orbital mechanism in which the tip of the blade draws an elliptical locus. Thereby, workability | operativity at the time of cutting work can be improved.

  Further, the roller holder further includes a roller support portion that supports the roller holder so as to be rotatable about the rotation shaft and to be rotatable about a plunger extending in parallel with the axial direction, and the roller holder includes the cam portion. It is preferable to rotate about the rotation axis by the rotation of the plunger and to rotate the plunger about the rotation of the plunger.

  According to such a configuration, the roller support portion can follow the rotation of the blade while drawing an elliptical locus. Thereby, an orbital mechanism can be provided and a blade can be rotated, and both improvement in operability and improvement in cutting performance can be realized.

  And a switching unit that can switch between an interlocking state that allows rotation of the housing relative to the base portion and a normal state that restricts rotation of the housing relative to the base portion. When in the state, the roller support unit supports the roller holder so that it cannot rotate about the rotation axis and can rotate about the plunger. When the switching unit is in the normal state, the roller support unit supports the roller holder. It is preferable that the portion supports the roller holder so that it cannot rotate about the plunger and can rotate about the rotation axis.

  According to such a configuration, the rotation of the roller support portion can be switched at the same time as the rotation of the housing is switched by the switching portion. In the normal state, the roller support portion can rotate about the rotation axis and cannot rotate about the plunger, so that the roller holder can support the blade without shaking. Thereby, the straightness at the time of cutting work increases. In the interlocked state, the roller support portion cannot rotate about the rotation axis and can rotate about the plunger. Therefore, the roller holder follows the rotation of the plunger without using the orbital mechanism. Can be supported. At the time of cutting work such as curve cutting, careful work is required. Therefore, if an orbital mechanism is used, the cutting speed may be too high. However, by switching the switching unit, the cutting direction can be changed without using the orbital mechanism in the interlocked state.

  The rotational motion transmission mechanism preferably includes a rack provided in the housing, and a pinion that meshes with the rack and is coaxially fixed to the plunger.

  According to such a configuration, the rotation of the housing can be converted into the rotation of the plunger and the blade by a simple configuration of the rack and pinion.

  The rotational motion transmission mechanism meshes with a rack provided in the housing, a gear portion that meshes with the rack and is rotatably supported by the base portion, and includes a first bevel gear, and the first bevel gear. And a second bevel gear coaxially fixed to the plunger.

  According to such a configuration, the rotation of the housing can be converted into the rotation of the plunger and the blade with a simple configuration.

  The housing is movable between a normal position located immediately above the base portion and a rotation position rotated with respect to the base portion, and the housing is moved from the rotation position to the normal position. It is preferable to further include an urging member for urging the lens.

  According to such a structure, after rotating a housing to a rotation position, it can return to a normal position with the urging | biasing force of an urging member. Thereby, workability at the time of cutting work improves. Furthermore, since it is urged | biased to a normal position, the rectilinear advance property of a reciprocating tool can be improved.

  The biasing member is preferably a leaf spring having one end supported by the base portion and the other end slidably supported by the plunger.

  According to such a configuration, the housing can be urged to the normal position with a simple configuration by using the leaf spring as the urging member.

  ADVANTAGE OF THE INVENTION According to this invention, the reciprocating tool with the favorable operativity of curve cutting can be provided.

The center sectional view of the reciprocating tool concerning a 1st embodiment of the present invention. The front view when the housing of the reciprocating tool concerning the 1st Embodiment of this invention exists in a normal position. The front view when the housing of the reciprocating tool concerning the 1st Embodiment of this invention exists in a rotation position. The fragmentary sectional view in alignment with IV-IV of FIG. 1 of the reciprocating tool concerning the 1st Embodiment of this invention. The fragmentary sectional view in alignment with VV of FIG. 1 of the reciprocating tool concerning the 1st Embodiment of this invention. The fragmentary sectional view in alignment with XX of FIG. 1 of the reciprocating tool concerning the 1st Embodiment of this invention. The fragmentary sectional view which followed the VII-VII of FIG. 1 of the reciprocating tool concerning the 1st Embodiment of this invention. The perspective view which shows the part which connects the plunger and orbital mechanism part of the reciprocating tool concerning the 1st Embodiment of this invention. The fragmentary sectional view which followed the IX-IX of FIG. 1 of the reciprocating tool concerning the 1st Embodiment of this invention. FIG. 4 is a partial cross-sectional view taken along the line XX of FIG. 1 when the plunger is rotated by an angle θ in the reciprocating tool according to the first embodiment of the present invention. The center sectional view and partial enlarged view showing the state where the locking pin and the locking hole of the reciprocating tool according to the second embodiment of the present invention are locked. The center sectional view and partial enlarged view which show the state which the latching of the latching pin and latching hole of the reciprocating tool concerning the 2nd Embodiment of this invention cancelled | released. The center sectional view of the reciprocating tool concerning a 3rd embodiment of the present invention. The front view when the housing of the reciprocating tool concerning the 3rd Embodiment of this invention exists in a normal position. The front view when the housing of the reciprocating tool concerning the 3rd Embodiment of this invention exists in a rotation position. The fragmentary sectional view in alignment with XVI-XVI of FIG. 13 of the reciprocating tool concerning the 3rd Embodiment of this invention.

  Hereinafter, a reciprocating tool according to an embodiment of the present invention will be described with reference to FIGS. A jigsaw 1 as an example of a reciprocating tool shown in FIG. 1 includes a housing 2, a motor 3, a base portion 4, a motion conversion mechanism 5, a rotary motion transmission mechanism 6, and a blade 7 serving as a tip tool. This is a tool for cutting a workpiece (not shown) with a blade 7. The direction in which the blade 7 is provided with respect to the motor 3 is defined as the forward direction, and the reverse is defined as the backward direction. The direction in which the blade 7 extends from the base portion 4 is defined as the downward direction, and the opposite direction is defined as the upward direction.

  The housing 2 is composed of a frame made of aluminum or the like, and a handle 21 is provided at a position that is an upper part of the rear end of the jigsaw 1 that is gripped by an operator. The handle 21 corresponds to the handle portion of the present invention. The housing 2 is rotatable with respect to the base portion 4. A trigger switch 22 that has a trigger 22 </ b> A that is operated by an operator and that controls power supply to the motor 3 is provided at the base portion of the handle 21. A power cable 23 for supplying electric power to the motor 3 and the like is provided at a position behind the handle 21 in the cutting direction. A positioning portion 8 that restricts the position of the housing 2 relative to the base portion 4 is provided in front of the trigger switch 22. The positioning unit 8 corresponds to the switching unit of the present invention.

  The positioning unit 8 includes an operation unit 81, a shaft unit 82, a stopper 83, and an urging member 84. The operation part 81 is exposed to the outside of the housing 2, and the operator can regulate the position of the housing 2 relative to the base part 4 by operating the operation part 81. The shaft portion 82 is provided with a stopper 83 that extends downward from the operation portion 81 and has a diameter increased radially outward. The stopper 83 can contact the inner surface of the housing 2. The urging member 84 urges the shaft portion 82 upward by contacting the stopper 83 with the upper end and contacting the inner surface of the housing 2 with the lower end. On the upper surface of the base portion 4, a concave portion 4 a that is recessed downward is formed, and the lower portion of the shaft portion 82 can be received. As shown in FIG. 1, the position of the housing 2 relative to the base portion 4 is fixed by inserting the lower portion of the shaft portion 82 into the recess 4a (normal state). By releasing the locking between the lower portion of the shaft portion 82 and the recess 4a, the fixing of the housing 2 to the base portion 4 is released (interlocked state). At this time, the stopper 83 and the inner surface of the housing 2 abut. The positioning portion 8 is provided with a holding portion (not shown) that holds the operation portion 81 in a state where it is pushed down against the biasing force of the biasing member 84. The operator can maintain a normal state by operating a holding unit (not shown).

  The motor 3 is a DC brushless motor capable of finely controlling the rotation speed and rotation angle, and mainly includes an output shaft 31 extending in the front-rear direction and a fan 32. The motor 3 corresponds to the drive source of the present invention. A pinion gear 31 </ b> A is provided at the front end portion of the output shaft 31. The fan 32 is provided behind the pinion gear 31 </ b> A and is coaxially fixed to the output shaft 31. The fan 32 introduces fan air into the housing 2 from a fan air inlet (not shown) formed in the housing 2 to cool the motor 3 and the rotational motion transmission mechanism 6. A bearing 24 is provided at the rear portion of the base portion 4 and radially outward of the fan 32 and at the connection portion with the housing 2. The housing 2 is rotatably supported on the base portion 4 via a bearing 24. Specifically, the housing 2 is movable between a normal position where the housing 2 is located immediately above the base portion 4 (FIG. 2) and a rotation position where the housing 2 is rotated in the left-right direction with respect to the base portion 4. is there. Since the center of the bearing 24 and the center of the output shaft 31 coincide with each other, the housing 2 rotates with respect to the base portion 4 about the output shaft 31.

  A portion of the base portion 4 located at the lower end and in contact with the wood is configured with a substantially rectangular base made of aluminum or the like and a facing surface 4A facing the wood plate as a workpiece is defined. . By tilting the base with respect to the base portion 4, it is possible to perform tilt cutting. When performing the tilt cutting, it is only necessary to operate the operation portion 81 described above so that the housing 2 and the base portion 4 cannot be rotated. The base portion 4 supports the housing 2 via a bearing 24 so as to be rotatable. The base unit 4 includes an orbital mechanism unit 9 for realizing a so-called orbital operation that rotates the blade 7 in conjunction with the rotation of the motor 3.

  The motion conversion mechanism 5 mainly includes a gear part 51, a weight part 52, a transmission part 53, an engagement pin 54, and a plunger 55. The gear portion 51 includes a gear 51A that meshes with the pinion gear 31A, and a cam portion 51B that is positioned in front of the gear 51A and configured integrally with the gear 51A. The gear portion 51 is rotatably supported on the base portion 4 by a support shaft 50 extending forward from the base portion 4. The weight portion 52 serves as a counterweight and is provided on the outer side in the radial direction of the support shaft 50 in the cam portion 51B. The weight portion 52 is formed with a substantially elliptical cam hole 52a penetrating in the front-rear direction. The cam portion 51B is inserted into the cam hole 52a, and the rotational motion of the gear portion 51 is converted into the reciprocating motion of the weight portion 52 in the vertical direction. As a result, vibration during operation of the jigsaw 1 can be reduced.

  The engaging pin 54 is provided in front of the weight portion 52 and rotates around the support shaft 50 together with the gear portion 51. The engagement pin 54 protrudes forward in a state different from the output shaft 31 and parallel to the output shaft 31. The transmission part 53 is located between the gear part 51 and the weight part 52 in the front-rear direction, and is formed with a cam hole 53a penetrating in the front-rear direction. In the cam hole 53a, the cam part 51B is inserted into the cam hole 53a, and the rotational movement of the gear part 51 is converted into the reciprocating movement of the transmission part 53 in the vertical direction. The reciprocating motion of the transmission unit 53 is transmitted to the orbital mechanism unit 9.

  The plunger 55 has a substantially cylindrical shape, extends in a direction (vertical direction) orthogonal to the output shaft 31, and is supported by the housing 2 so as to be reciprocable and rotatable in the vertical direction. The term “rotatable” refers to being rotatable about an axis extending in the vertical direction and rotatable about an axis extending in the left-right direction (a rotating shaft 42 described later). The plunger 55 includes a pin receiving portion 55A and a blade holding portion 55B, and a first key groove 55a (FIG. 4) into which a later-described first key 63 is fitted and a later-described second key 56A are fitted. A second key groove 55b (FIG. 7) is formed. The first key groove 55a and the second key groove 55b are respectively recessed inward in the radial direction. The first key groove 55 a is formed at the upper end of the plunger 55, and the second key groove 55 b is formed at the lower part of the plunger 55.

  The pin receiving portion 55A is provided at a substantially central portion in the vertical direction of the plunger 55, has a substantially U-shape when viewed from the side, and is disposed so that the U-shaped opening faces rearward. The pin receiving portion 55A extends in the left-right direction, and the engagement pin 54 is inserted therein. Since the engaging pin 54 is allowed to move in the left-right direction within the groove of the pin receiving portion 55A and is restricted from moving in the vertical direction, the pin receiving portion 55A moves vertically according to the movement of the engaging pin 54. Will only do. Thereby, the motion conversion mechanism 5 can convert the rotational motion output from the output shaft 31 into the vertical motion. As will be described later, the pin receiving portion 55A has a depth enough to hold the engaging pin 54 even when the plunger 55 rotates about its axis.

  The blade holding portion 55B is provided at the lower end portion of the plunger 55 and holds the blade 7 in a detachable manner. As shown in FIG. 6, the center of the plunger 55 and the center position of the blade 7 substantially coincide with each other when viewed from above.

  The plunger 55 is supported by a plunger guide 41 so as to be slidable in the vertical direction at a substantially central portion in the vertical direction. The plunger guide 41 is supported at the upper portion thereof so as to be rotatable about the rotation shaft 42 extending in the left-right direction. When the plunger guide 41 rotates about the rotation shaft 42, the plunger 55 (blade 7) also rotates about the rotation shaft 42. Thereby, the blade 7 and the plunger 55 can follow the orbital operation of the orbital mechanism unit 9.

  An arm portion 56 extending outward in the radial direction is provided below the plunger 55 and above the blade holding portion 55B. As shown in FIG. 8, one end of the arm portion 56 is supported by the plunger 55 so as to be slidable in the vertical direction by a second key 56A fitted in the second key groove 55b. At the other end of the arm portion 56, a substantially cylindrical column portion 57 extending downward is provided. As shown in FIG. 9, the column portion 57 is movable along the column groove 4 b formed in the base portion 4. Specifically, the column groove 4 b has an arc shape centered on the plunger 55, and the column portion 57 moves in the circumferential direction in the column groove 4 b in conjunction with the rotation of the plunger 55.

  As shown in FIG. 8, an orbital holding portion 58 that rotatably holds the orbital mechanism portion 9 is provided below the column portion 57. The orbital holding part 58 includes a rectangular parallelepiped box part 58A and a substantially cylindrical support part 58B protruding outward from the lateral side surface of the box part 58A. The orbital holding portion 58 is formed with a through hole 58a that penetrates in the vertical direction and through which the column portion 57 is inserted. Thereby, the orbital holding part 58 can move in the vertical direction with respect to the column part 57 and can rotate around the column part 57. The orbital holding part corresponds to the roller support part of the present invention.

  The rotary motion transmission mechanism 6 is provided on the upper portion of the plunger 55, and includes a rack 61, a pinion 62, a first key 63 (FIG. 4) fitted in the first key groove 55a, and a metal 64 (FIG. 1). And. As shown in FIG. 4, the rack 61 is fixed to the housing 2, extends in the left-right direction, and meshes with the pinion 62. As shown in FIG. 1, the pinion 62 includes a pinion 62A that meshes with the rack 61, and a held portion 62B that is located below the pinion 62A and has a smaller diameter than the pinion 62A. A substantially central portion of the pinion 62 is formed with an insertion hole 62a that penetrates in the vertical direction and through which the plunger 55 is slidable in the vertical direction. The held portion 62B is rotatably supported by the base portion 4 via the metal 64, and is held by the base portion 4 at the step portion between the pinion 62A and the held portion 62B.

  As shown in FIG. 5, a through hole 62b penetrating in the radial direction is formed in the rear portion of the held portion 62B, and a plate spring 43 described later is held in the through hole 62b. Since the length of the rack 61 in the vertical direction is longer than the vertical movement distance of the plunger 55, the pinion 62 does not separate from the plunger 55 even if the plunger 55 moves up and down. Thereby, the rotational motion transmission mechanism 6 can transmit the rotation of the housing 2 to the rotation of the plunger 55 while following the vertical movement of the plunger 55.

  As shown in FIG. 1, the blade 7 includes a blade portion 7A for cutting a workpiece, and is attached to the plunger 55 so that the blade portion 7A faces the front and the back portion faces the rear. The blade portion 7A corresponds to the cutting portion of the present invention.

  As shown in FIGS. 1 and 5, a leaf spring 43 having one end fixed to the base portion 4 and the other end held by a pinion 62 by a through hole 62c is provided below the rotational motion transmission mechanism 6. Yes. The plunger 55 is biased to a position (normal position) where the blade portion 7A of the blade 7 is directed forward by the elastic force of the leaf spring 43. In other words, the housing 2 is urged from the rotation position to the normal position by the plate spring 43. The distance in the radial direction of the through hole 62b is long enough to prevent the leaf spring 43 and the pinion 62 from separating even when the plunger 55 rotates.

  The orbital mechanism unit 9 mainly includes a roller holder 91, a roller 92, and a change knob 93 (FIG. 2). As shown in FIG. 1, the roller holder 91 is substantially L-shaped in a side view, and is located behind the abutted portion 91 </ b> A and a abutted portion 91 </ b> A that can abut against the lower end portion of the transmission portion 53. A contact portion 91B that can contact the change knob 93; The contacted portion 91A is positioned directly below the transmission portion 53, and the contact portion 91B is positioned directly below the change knob 93. As shown in FIG. 6, the roller holder 91 is a pair of plates spaced apart in the left-right direction, and has a through-hole 91 a penetrating in the left-right direction. A support portion 58B is inserted into the through hole 91a. Accordingly, the roller holder 91 is supported so as to be rotatable around the support portion 58B in a side view. Further, with the configuration of the orbital holding portion 58 as described above, the roller holder 91 can rotate around the support portion 58B, can move up and down along the column portion 57, and the column portion 57 moves in the column groove 4b. As a result, the plunger 55 can be turned around. When the transmission portion 53 presses the contacted portion 91A, the roller holder 91 rotates around the support portion 58B.

  The roller 92 is located at the front end of the roller holder 91, and is supported by the roller holder 91 so as to be rotatable about a rotation shaft 92A extending in the left-right direction, as shown in FIG. The roller 92 is formed with a blade support groove 92a that is recessed inward in the radial direction over the entire circumference. By arranging the rear portion of the blade 7 in the blade support groove 92a, the blade 7 is supported by the roller 92 so as to be slidable in the vertical direction.

  As shown in FIG. 2, the change knob 93 protrudes outside the base portion 4 and includes a switching shaft 94, an urging spring 95, and a ball 96. The change knob 93 is supported by the base portion 4 so as to be rotatable about a switching shaft 94 extending in the left-right direction. As shown in FIG. 1, a restricting portion 94 </ b> A that can abut against the abutting portion 91 </ b> B and restricts the rotation of the roller holder 91 is defined at the right end of the switching shaft 94. A plurality of engagement holes 4 c that can engage with the balls 96 are formed on the outer surface of the base portion 4. The urging spring 95 urges the ball 96 toward the base portion 4, and the change knob 93 is positioned at a predetermined position when the ball 96 and the engagement hole 4 c are engaged. By rotating the change knob 93, the contact position where the restricting portion 94A and the contact portion 91B contact each other moves in the vertical direction. In the state shown in FIG. 1, since the switching shaft 94 is in the orbital operation cut position, the contacted portion 91 </ b> A and the base portion 4 are separated in the vertical direction. In this state, since the vertical movement of the transmission portion 53 is not transmitted to the roller holder 91, the roller holder 91 does not rotate. When the change knob 93 is switched to move the contact portion 91B further upward than the state shown in FIG. 1, the contacted portion 91A comes close to the base portion 4, and therefore the vertical movement of the transmission portion 53 is transmitted to the roller holder 91. The roller holder 91 rotates around the support portion 58B. Thereby, the orbital operation of the blade 7 can be realized.

  Next, the operation of the jigsaw 1 will be described. The motor 3 rotates by connecting the power cable 23 to a commercial power source (not shown) and pulling the trigger 22A.

  The rotation of the motor 3 is converted from a rotational motion to a reciprocating motion by the motion converting mechanism 5 and transmitted to the plunger 55 and the blade 7, and the blade 7 moves up and down. At this time, the transmission part 53 also moves up and down by the rotation of the gear part 51, the abutted part 91A is pressed against the lower end part of the transmission part 53, and the roller holder 91 rotates around the support part 58B. As the roller 92 rotates about the support portion 58B, the blade 7 also rotates about the rotation shaft 42. By the vertical movement of the blade 7 and the rotation of the roller holder 91, the tip end portion (blade portion 7A) of the blade 7 operates so as to draw a substantially elliptical locus (orbital operation). The operator can switch the state of the orbital operation by rotating the change knob 93.

  When the operator cuts a curve, the operation unit 81 is pulled up from the housing 2 (interlocked state), and the housing 2 is rotated with respect to the base unit 4 (FIG. 3). The rack 61 also rotates around the output shaft 31 as the housing 2 rotates, and the pinion 62 that meshes with the rack 61 rotates. As a result, as shown in FIG. 10, the blade 7 is angled around the central axis of the plunger 55 with respect to a virtual line C indicating the direction (front-rear direction) in which the blade portion 7 </ b> A of the blade 7 faces in the normal position. Rotate by θ. Specifically, as shown in FIG. 3, when the housing 2 is tilted to the right side when viewed from the front, the rack 61 moves to the right side, and the pinion 62 rotates clockwise in the state of FIG. The part 7A is directed to the right side. In other words, when projected onto a plane orthogonal to the axial direction of the plunger 55, the blade portion 7A moves in the same direction as the direction in which the housing 2 is tilted. At this time, since the arm portion 56 also rotates around the plunger 55 and the column portion 57 also moves along the column groove 4b, the roller holder 91 also rotates around the plunger 55 in conjunction with the rotation of the blade 7. . That is, in the first embodiment, since the roller holder 91 can follow the rotation of the blade 7, the orbital operation can be performed while the blade 7 is rotated. Further, when the housing 2 is tilted to the left, the pinion 62 rotates counterclockwise in the state of FIG. 4, and the blade portion 7A is directed to the left.

  By returning the housing 2 to the normal position (FIG. 2), the operator can turn the blade 7 forward as viewed from above, as shown in FIG. At this time, since the housing 2 is urged toward the normal position by the leaf spring 43, the operator can easily return the housing 2 to the normal position. Further, the housing 2 can be held in the normal position by the urging force of the leaf spring 43.

  When an operator performs a linear cutting operation, a normal state in which the shaft portion 82 and the concave portion 4a are engaged is held by a holding portion (not shown) (FIGS. 1 and 2). Thereby, since the housing 2 cannot be rotated with respect to the base portion 4, it is possible to perform a straight line cutting operation stably.

  According to such a configuration, the blade 7 held by the plunger 55 can be rotated in conjunction with the rotation of the housing 2. Thereby, a cutting direction can be changed easily and the operativity at the time of curve cutting improves.

  According to such a configuration, since the housing 2 can be rotated with respect to the base portion around the output shaft 31, it is not necessary to displace the motor 3 and the output shaft 31 in accordance with the rotation of the housing 2. Thereby, rotation with respect to the base part 4 of the housing 2 is realizable with a simple structure.

  According to such a configuration, the operator can rotate the blade 7 while holding the handle 21. Thereby, the cutting direction can be easily changed during the cutting operation using the jigsaw 1. In particular, in the case of the jigsaw 1 which is a reciprocating tool in which the positions of the handle 21 and the blade 7 are close to each other, the operation of the handle 21 is difficult to be transmitted to the blade 7 and the operability at the time of cutting a curve is not good. In such a case, a significant improvement in workability can be realized by applying the present invention.

  According to such a structure, by switching the positioning part 8, it can be set as an interlocking state when the operation | work which changes a cutting direction is required, and can be set as a normal state in the operation | work cut | disconnected linearly. Thereby, the width | variety of the operation | work at the time of a cutting operation spreads.

  According to such a configuration, since the blade portion 7A moves in the same direction as the rotation direction of the housing 2, when turning to the right, the blade portion 7A is directed to the right side by rotating the housing 2 to the right side. If it is desired to turn to the left, the blade portion 7A can be directed to the left by rotating the housing 2 to the left. Thereby, the feeling at the time of a worker's work improves.

  According to such a configuration, since the orbital mechanism portion 9 that moves the blade 7 so that the tip portion of the blade 7 draws an elliptical locus is provided, the machinability of the blade 7 is improved. Thereby, workability | operativity at the time of cutting work can be improved.

  According to such a configuration, the orbital holding unit 58 can follow the rotation of the blade 7. Thereby, the orbital mechanism can be provided and the blade 7 can be rotated, so that both improvement in operability and improvement in cutting performance can be realized.

  According to such a configuration, the rotation of the housing 2 can be converted into the rotation of the plunger 55 and the blade 7 with a simple configuration of the rack and pinion.

  According to such a configuration, the housing 2 can be returned to the normal position by the urging force of the leaf spring 43 after being rotated to the rotation position. Thereby, workability at the time of cutting work improves. Furthermore, since it is biased to the normal position, the straightness of the jigsaw 1 can be improved.

  According to such a configuration, the housing 2 can be urged to the normal position with a simple configuration by using the leaf spring 43 as an example of the urging member.

  Next, a jigsaw 201 according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the second embodiment, the orbital operation of the blade 7 by the orbital mechanism unit 9 can be switched on and off in conjunction with the rotation of the change knob 93.

  As shown in the partially enlarged view in FIG. 11, in the housing 2, a locking hole 202 a that is recessed rearward is formed in the rear of the switching shaft 94 and immediately below the fan 32. A restriction portion 294A is defined on the end surface of the switching shaft 94, and a notch 294B that is cut out in a substantially L shape is formed in the restriction portion 294A. As shown in FIG. 11, the notch 294 </ b> B can receive the rear end portion of the roller holder 91.

  On the rear side of the restricting portion 294A, a large diameter portion 295A that is slidably held on the base portion 4, a small diameter portion 295B in which a spring 296 is extended outwardly from the rear portion of the large diameter portion 295A, and A locking pin 295 provided with is provided. The tip of the enlarged diameter portion 295A abuts on the restriction portion 294A, and the small diameter portion 295B can be engaged with the engagement hole 202a. The spring 296 urges the locking pin 295 forward by contacting the step between the enlarged diameter portion 295 </ b> A and the small diameter portion 295 </ b> B and the rear end contacting the housing 2.

  In the state shown in FIG. 11, the outer peripheral surface of the restricting portion 294A presses the locking pin 295 backward, so that the locking pin 295 moves rearward against the urging force of the spring 296 and engages with the small diameter portion 295B. The stop hole 202a is locked. As a result, the housing 2 cannot rotate with respect to the base portion 4 (normal state), and the housing 2 is held in the normal position. At this time, since the notch 294B receives the rear end portion (contact portion 91B) of the roller holder 91, the roller holder 91 rotates clockwise about the support portion 58B, and the contacted portion 91A and the base Part 4 is close. Thereby, the vertical movement of the transmission part 53 is transmitted to the roller holder 91, and the orbital mechanism part 9 performs an orbital operation.

  When the change knob 93 is rotated about 90 ° from the state shown in FIG. 11, the state shown in FIG. 12 is obtained. The notch 294 </ b> B is directed rearward and the enlarged diameter portion 295 </ b> A and the notch 294 </ b> B face each other, whereby the locking pin 295 is moved forward by the urging force of the spring 296. As a result, the locking between the small diameter portion 295B of the locking pin 295 and the locking hole 202a is released (interlocked state). At the same time, the roller holder 91 rotates counterclockwise from the state of FIG. 11 around the support portion 58B, and the contacted portion 91A is separated from the base portion 4. Thereby, since the vertical movement of the transmission part 53 is not transmitted to the roller holder 91, the orbital mechanism part 9 does not perform an orbital operation.

  According to such a configuration, the rotation of the roller holder 91 can be switched at the same time as the rotation of the housing is switched by the restricting portion 294A, the locking pin 295, and the spring 296. In the normal state, the roller holder 91 can rotate about the support portion 58B and cannot rotate about the plunger 55, so that the roller holder 91 can support the blade 7 without shaking. Thereby, the straightness at the time of cutting work increases. In the interlocked state, the roller holder 91 cannot rotate about the support portion 58B and can rotate about the plunger 55. Therefore, the roller holder 91 follows the rotation of the plunger 55 without using the orbital mechanism. Thus, the blade 7 can be supported. At the time of cutting work such as curve cutting, careful work is required. Therefore, if an orbital mechanism is used, the cutting speed may be too high. However, by switching the change knob 93, the cutting direction can be changed without using the orbital mechanism in an interlocked state.

  Next, a third embodiment will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. In the third embodiment, the jigsaw 301 is provided with a rotational motion transmission mechanism 306 different from the above.

  The rotational motion transmission mechanism 306 includes a rack 361, a gear unit 362, and a bevel gear 363. The rack 361 is provided in front of the positioning portion 8 in the housing 2 and at a position facing the base portion 4. The gear unit 362 is rotatably supported on the base portion 4 via a bearing 362C. The gear unit 362 is integrally provided with a spur gear 362 A that meshes with the rack 361 and a bevel gear 362 B that meshes with the bevel gear 363. The bevel gear 362B corresponds to the first bevel gear of the present invention, and the bevel gear 363 corresponds to the second bevel gear of the present invention.

  The bevel gear 363 is fixed to the upper end of the plunger 55 by a key 363A and is rotatably supported by the base portion 4 via a bearing 363B. By rotating the housing 2 from the normal position shown in FIG. 14 to the rotation position shown in FIG. 15, the rack 361 rotates around the output shaft 31 together with the housing 2. As indicated by the arrow in FIG. 15, the spur gear 362A and the bevel gear 362B meshing with the rack 361 rotate counterclockwise, and as shown by the arrow in FIG. 16, the bevel gear 363 rotates clockwise, thereby causing the plunger 55 And the blade 7 rotates.

  According to such a configuration, the rotation of the housing can be converted into the rotation of the plunger and the blade with a simple configuration.

  The reciprocating tool according to the present embodiment is not limited to the above-described embodiment, and various improvements and modifications can be made within the scope described in the claims.

  For example, although the housing 2 is rotated with respect to the base part 4, it is not limited to this. For example, the handle may be configured to be rotatable about its axis, and the plunger 55 may be rotated by rotating the handle. Further, the handle 21 may be configured to be rotatable around the plunger 55 when viewed from above.

  The rotational motion transmission mechanism 6 is not limited to a rack and pinion or a bevel gear. Any mechanism that can convert the rotation of the housing 2 into the rotation of the plunger 55 may be used.

  In this embodiment, a jigsaw that is a cutting tool has been described as a reciprocating tool.

1, 201, 301 ·· Jigsaw, 2 · Housing, 3 · Motor, 4 · · Base portion, 5 · · Motion conversion mechanism, 6,306 · · Rotary motion transmission mechanism, 7 · · Blade, 7A · · · Blade part, 9 .... Orbital mechanism part, 21 ... Handle, 31 ... Output shaft, 32 ... Fan, 41 ... Plunger guide, 43 ... Plate spring, 55 ... Plunger, 58 ... Orbital holding part, 61,361 ... Rack, 62 ... Pinion, 64 ... Metal, 91 ... Roller holder, 92 ... Roller, 92A ... Rotary shaft, 92a ... Blade support groove, 94 ... Switching shaft, 94A ... Regulating part, 361 ・ ・ Rack, 362 ・ ・ Gear unit

Claims (11)

A driving source;
A plunger that is reciprocally driven by the drive source and detachably holds the blade;
A base for accommodating the plunger;
A housing having a handle portion and rotatably connected to the base portion;
A reciprocating tool comprising: a rotary motion transmission mechanism for rotating the plunger and the blade in conjunction with the rotation of the housing. The housing portion houses the drive source;
The drive source includes an output shaft that extends and rotates in a direction orthogonal to the plunger,
The reciprocating tool further includes a motion conversion mechanism that is housed in the base portion, converts a rotational drive of the output shaft into the reciprocating drive, and transmits the reciprocating drive to the plunger.
The reciprocating tool according to claim 1, wherein the housing is rotatable about the output shaft.   2. A switching unit capable of switching between an interlocking state in which the rotation of the housing with respect to the base portion is allowed and a normal state in which the rotation of the housing with respect to the base portion is restricted are further provided. Or the reciprocating tool of Claim 2. The blade includes a cutting portion that cuts a workpiece.
The rotary motion transmission mechanism rotates the plunger so that the cutting portion moves in the rotation direction of the housing when projected onto a plane orthogonal to the axis of the plunger. The reciprocating tool according to any one of the above. A plunger support that is housed in the base and supports the plunger slidably and rotatably;
A cam portion housed in the base portion and driven by the drive source;
A roller holder that is pivoted about a pivot shaft that extends in a direction orthogonal to the axial direction of the plunger and the output shaft by the cam portion, and that slidably supports the blade;
The reciprocating tool according to claim 1, wherein the tip portion of the blade draws an elliptical locus by the rotation of the roller holder and the reciprocating drive. A roller support portion that supports the roller holder so as to be rotatable about the rotation axis and to be rotatable about the plunger;
6. The reciprocating tool according to claim 5, wherein the roller holder is rotated about the rotation axis by the cam portion, and is rotated about the plunger by rotation of the plunger. A switching unit capable of switching between an interlocking state that allows rotation of the housing relative to the base portion and a normal state that restricts rotation of the housing relative to the base portion;
When the switching portion is in the interlocking state, the roller support portion supports the roller holder so that the roller holder cannot rotate about the rotation axis and can rotate about the plunger, and the switching portion is in the normal state. The reciprocating tool according to claim 6, wherein the roller support portion supports the roller holder so that the roller holder cannot rotate about the plunger and can rotate about the rotation shaft.   The rotary motion transmission mechanism includes a rack provided in the housing, and a pinion that meshes with the rack and is coaxially fixed to the plunger. Reciprocating tool.   The rotational motion transmission mechanism meshes with a rack provided in the housing, a gear portion that meshes with the rack and is rotatably supported by the base portion, and includes a first bevel gear, and the first bevel gear. The reciprocating tool according to any one of claims 1 to 7, further comprising a second bevel gear coaxially fixed to the plunger. The housing is movable between a normal position located directly above the base portion and a rotation position rotated with respect to the base portion,
The reciprocating tool according to claim 1, further comprising a biasing member that biases the housing from the rotational position to the normal position.   The reciprocating tool according to claim 10, wherein the biasing member is a leaf spring having one end supported by the base portion and the other end slidably supported by the plunger.

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