JP2015071228A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool which enables smooth cutting operation even when a step is formed in a cut part when cutting an easily deformable cut material in a curved manner.SOLUTION: A jig saw 1 includes: a housing 2; a motor housed in the housing 2; a plunger having a tip part to which a blade 6 may be attached, the plunger which is driven by the motor to reciprocate; and a base 41 which is attached to the housing 2 and is provided so as to move on a cut material with the housing 2. A plate 7 which may be detachably attached to the base 4 so as to be positioned on a base surface 41A of the base 41, which is located at the opposite side of the housing 2, and is formed shorter than the base surface 41A in a cutting direction.

Description

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

  2. Description of the Related Art Conventionally, a cutting tool such as a jigsaw that performs a cutting operation by converting a rotary motion of a motor as a driving source into a reciprocating motion of a blade is known. This type of cutting tool cuts a material to be cut with a reciprocating blade while moving the main body while the base attached to the main body is in contact with the material to be cut (see, for example, Patent Document 1). ).

Japanese Patent No. 4525532

  FIG. 19 is a side view showing the appearance of a conventional jigsaw. The jigsaw 400 incorporates a motor (not shown) inside the housing 401, and converts the rotational motion of the motor into reciprocating motion of the blade 402. The jig 400 has a handle 403 formed at the top, and a trigger 404 for turning on / off the motor is provided at the bottom of the handle 403. Further, a base 405 is attached below the housing 401. The operator holds the handle 403 and presses the main body in the cutting direction with the bottom surface of the base 405 in contact with the material to be cut, and cuts the material to be cut by the blade 402 that moves up and down.

  When cutting a material to be cut, such as a veneer plate, by the jigsaw 400 described above, the weight of the jigsaw 400 body is applied to the cut portion of the material to be cut located behind the blade 402 via the base 405, and the material to be cut is May be bent. For example, when performing a straight cut that cuts the workpiece along a straight line, the left and right cut portions are substantially equally weighted, and the same degree of bending occurs. On the other hand, when performing the curve cutting that cuts the workpiece along the curve, the weight applied to the cut portion has a difference between right and left, and as a result of one side being largely bent, a step is generated in the cut portion. Sometimes.

  FIG. 20 is a cross-sectional view of a base of a conventional jigsaw and a material to be cut, and a cross section of a rear portion of the base 405 is shown. In FIG. 20, since the base 405 is placed on the left cut portion 500 </ b> A of the material to be cut, the weight of the jigsaw 400 main body is applied only to the left cut portion 500 </ b> A via the base 405. As a result, a step δ1 is generated in the cut portion 500C between the left cut portion 500A and the right cut portion 500B of the workpiece. In this state, when cutting the material to be cut along a curve that further turns counterclockwise, the operator turns the front of the jigsaw 400 to the left in accordance with the cutting direction. At this time, the jigsaw 400 swings rearward to the right, but the rear portion of the base 405 comes into contact with the step δ1 of the cutting portion 500C and gets caught. Therefore, there is a problem that the operator has to lift the back of the jigsaw 400 to get over the step.

  Therefore, there has been a demand for a cutting tool capable of smoothly performing a cutting operation even when a step is generated in a cut portion when a material to be cut that is easily bent is cut.

  In order to solve the above-mentioned problems, a cutting tool according to the present invention includes a housing, a motor accommodated in the housing, a plunger that can be fitted with a blade at the tip, and driven and reciprocated by the motor, and is attached to the housing. And a base that is provided so as to move on the material to be cut together with the housing, and a plate that is detachable from the base so as to be positioned on the base surface on the opposite side of the base and is shorter than the base surface in the cutting direction It is characterized by having.

  According to such a configuration, a gap corresponding to the thickness of the plate can be generated between the material to be cut and the base surface by performing the cutting operation by mounting the plate on the base. Therefore, even when a step occurs in the cutting part when cutting a material to be cut that is easily bent, the base can be changed without the base contacting the step. Troublesome work such as switching is unnecessary, and workability is improved.

  Further, when the housing is on the upper side and the base is on the lower side, the rear end in the cutting direction of the plate is preferably located in the vicinity below the center of gravity of the tool body.

  According to such a configuration, the weight of the tool body can be added to the material to be cut through the plate located below the center of gravity position. Therefore, when the cutting work is performed with the plate attached to the base, the posture of the tool body is maintained. Stable and accurate positioning is possible without impairing operability.

  It is preferable that a plate has a nail | claw part latched to a base.

  According to this configuration, the position of the plate can be fixed with respect to the base, and the plate can be easily attached to and detached from the base, so that the plate can be easily attached and detached according to the type of material to be cut and the work content. Therefore, convenience is improved.

  The claw portion is preferably provided at the front end in the cutting direction of the plate, and is preferably locked to the front end in the cutting direction of the base so as to be detachably fixed to the base.

  According to such a configuration, even when the plate moves on the workpiece during the cutting operation, the position of the plate is securely fixed with respect to the base, and the claw portion does not contact the workpiece. A smooth cutting operation is possible by moving the tool body smoothly.

  Moreover, it is preferable that a nail | claw part is provided in the cutting direction rear-end part of a plate, latches to the side surface of a base, and fixes a plate so that attachment or detachment with respect to a base is possible.

  According to such a configuration, even when the plate moves on the workpiece during the cutting operation, the position of the plate is securely fixed with respect to the base, and the claw portion does not contact the workpiece. A smooth cutting operation is possible by moving the tool body smoothly.

  Furthermore, it is preferable that a groove portion with which the claw portion engages is formed on the side surface of the base.

  According to such a configuration, since the claw portion does not protrude from the side surface of the base, even when the plate moves on the material to be cut during the cutting operation, smooth movement is possible without contacting the material to be cut.

  The plate is preferably fixed to the base with screws.

  According to such a configuration, the plate can be reliably fixed to the base without providing the claw portion on the plate.

  It is preferable that an insertion portion for inserting the blade is formed in the base in a substantially U shape that opens forward in the cutting direction, and the plate is formed in a substantially U shape on the base surface so as to cover the front side portion in the cutting direction. .

  According to this configuration, the posture of the tool body can be stabilized without interfering with the reciprocating motion of the blade.

  The plate preferably has a plate main body and a pair of protrusions that can protrude backward in the cutting direction with respect to the plate main body and can be retracted into the plate main body.

  According to such a configuration, the protruding portion is protruded during straight cutting to stabilize the posture of the tool body, and the curved portion is retracted to prevent contact with the workpiece to be cut behind the base. It becomes possible. Therefore, the operability and workability can be improved by projecting and retracting the projecting portion according to the type of the material to be cut and the work content without attaching or removing the plate.

  The base is preferably formed of a steel material.

  According to this configuration, the posture of the tool main body is stabilized and the frictional force with the material to be cut is suppressed, so that a smooth cutting operation can be performed.

  The plate is preferably made of resin.

  According to such a configuration, the surface of the material to be cut is hardly damaged even when sliding on the material to be cut, so that convenience is improved.

  Moreover, it is preferable that a low friction agent is applied to the contact surface of the plate with the material to be cut.

  According to such a configuration, the frictional force with the material to be cut is reduced, so that a smooth cutting operation is possible.

  Moreover, it is preferable to have a slip prevention part in the front end of the cutting direction of a plate.

  According to such a configuration, since the tool main body is fixed by bringing the anti-slip portion into contact with the material to be cut at the start of the window extraction operation, accurate positioning is possible. Therefore, drilling can be performed with good accuracy, and further operability and workability can be improved.

  According to the cutting tool according to the present invention, a smooth cutting operation can be performed even when cutting a material to be cut that is easily bent.

It is a side view which shows the external appearance of the jigsaw which concerns on the 1st Embodiment of this invention. It is a center sectional view showing the internal structure of a jigsaw concerning a 1st embodiment of the present invention. It is a bottom view of the base at the time of plate mounting | wearing of the jigsaw which concerns on the 1st Embodiment of this invention. It is a top view of the plate of the jigsaw which concerns on the 1st Embodiment of this invention. It is a side view of the plate of the jigsaw which concerns on the 1st Embodiment of this invention. It is a rear view of the plate of the jigsaw which concerns on the 1st Embodiment of this invention. It is a side view which shows the external appearance at the time of the sliding part protrusion of the jigsaw which concerns on the 1st Embodiment of this invention. It is a bottom view of a base at the time of slide part projection of a jigsaw concerning a 1st embodiment of the present invention. It is AA sectional drawing in FIG. It is explanatory drawing which shows the curve cutting of the to-be-cut material by the jigsaw which concerns on embodiment of this invention. It is BB sectional drawing in FIG. It is explanatory drawing (the 1) which shows the window extraction operation | work by the jigsaw which concerns on the 1st Embodiment of this invention. It is explanatory drawing (the 2) which shows the window extraction operation | work by the jigsaw which concerns on the 1st Embodiment of this invention. It is explanatory drawing (the 3) which shows the window extraction operation | work by the jigsaw which concerns on the 1st Embodiment of this invention. It is a bottom view of the base of the jigsaw which concerns on the 2nd Embodiment of this invention. It is a side view which shows the external appearance of the jigsaw which concerns on the 3rd Embodiment of this invention. It is a bottom view of the base at the time of plate mounting | wearing of the jigsaw which concerns on the 3rd Embodiment of this invention. It is a side view which shows the external appearance of the jigsaw which concerns on the 4th Embodiment of this invention. It is a side view which shows the external appearance of the conventional jigsaw. It is sectional drawing of the base of a conventional jigsaw, and a to-be-cut material.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, the case where the present invention is applied to a jigsaw will be described as an example.

  First, a jigsaw according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the appearance of the jigsaw 1 according to the first embodiment, and FIG. 2 is a central sectional view showing the internal structure of the jigsaw 1. The jigsaw 1 is mainly composed of a housing 2, a motor 3, a gear cover 4, a motion conversion mechanism 5, and a blade 6, and is a cutting tool that cuts a workpiece to be cut by the blade 6. Hereinafter, the direction in which the motion conversion mechanism 5 is provided for the motor 3 is defined as the forward direction, and the reverse is defined as the backward direction. In addition, a direction in which the blade 6 extends from a base 41 described later is defined as a downward direction, and the opposite is defined as an upward direction. A blade portion 6A for cutting the material to be cut is provided on the front side of the blade 6, and the direction from the rear to the front is the cutting direction.

  The housing 2 is composed of a frame made of resin or the like, and a handle 21 is provided on the top of the housing 2 for an operator to hold. The housing 2 has an opening in the front, and a cover that covers the opening is provided. The motor 3 is accommodated in the housing 2 at a position below the handle 21. A gear cover 4 is located in the housing 2 at a position close to the motor 3. A power cable 26 extending rearward is provided at the rear portion of the housing 2. 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 front portion of the handle 21.

  The motor 3 mainly includes an output shaft 31 and a fan 32 extending in the front-rear direction. 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, and cools the motor 3, the motion conversion mechanism 5, and the like.

  A base 41 is attached to the lower portion of the gear cover 4 and is formed in a substantially rectangular shape and made of a steel material such as aluminum as a base material. The gear cover 4 also includes an orbital mechanism 9 for housing a motion conversion mechanism 5 and realizing a so-called orbital operation for rotating the blade 6 in conjunction with the rotation of the motor 3.

  The base 41 is fixed to the bottom surface side of the housing 2 via bolts 42 so that the longitudinal direction coincides with the cutting direction. On the opposite side of the base 41 from the housing 2, a base surface 41 </ b> A that faces the material to be cut is defined. A plate 7 is provided on the front side of the base 41. The plate 7 is made of a resin such as POM, and is detachably disposed on the base 41 so as to be positioned on the base surface 41 </ b> A of the base 41. An anti-slip portion 8 is provided at the front end of the plate 7. The anti-slip portion 8 has a larger coefficient of friction than the base 41 and the plate 7 and is made of an elastically deformable material.

  Here, based on FIG. 2 thru | or FIG. 9, the shape of the base 41, the plate 7, and the slip prevention part 8 is demonstrated in detail. FIG. 3 is a view showing the base surface 41 </ b> A when the plate 7 is attached to the base 41. In the front part of the base 41, an insertion part 41B for inserting the blade 6 is formed in a substantially U-shape opening forward. The blade 6 extends downward through the insertion portion 41B. As shown in FIGS. 2 and 9, the central portion 41 </ b> C of the base 41 is formed in a hollow, substantially semi-cylindrical shape, and is fixed to the housing 2 via bolts 42 at the central portion 41 </ b> C. Further, as shown in FIG. 2, guide holes 41 </ b> F are formed in a pair of front end portions extending forward of the base 41. The guide hole 41F penetrates the front end portion of the base 41 from the side surface to the insertion portion 41B, and is formed so that a guide member (not shown) can be inserted in a direction orthogonal to the cutting direction.

  The plate 7 has a plate body 7A formed in a flat plate shape having a thickness δ. 4, 5 and 6 are a top view, a side view and a rear view of the plate 7, respectively. The plate body 7A is shorter than the base 41 in the longitudinal direction and is formed in a substantially U-shape that covers the front portion of the base 41. That is, an insertion portion for inserting the blade 6 is formed in the front portion of the plate 7. Further, the rear end of the plate body 7A is located near the lower center of the center of gravity G of the jigsaw 1 as shown in FIG.

  The plate 7 has front claw portions 7B and 7C at a pair of front end portions extending forward of the plate main body 7A, and has rear claw portions 7D and 7E at the rear ends of both side surfaces of the plate main body 7A. The front claw portions 7B and 7C protrude upward from the front end of the plate body 7A and further incline toward the rear. The front claw portions 7B and 7C are provided with small protrusions 7b and 7c that protrude toward the base 41 side (rear). In a state where the plate 7 is attached to the base 41, the small protrusions 7 b and 7 c are inserted into a recess provided at the front end of the base 41. The back claws 7D and 7E protrude upward from the rear end of the side surface of the plate body 7A. Small protrusions 7 d and 7 e that protrude toward the center side of the base 41 are provided on the rear claws 7 </ b> D and 7 </ b> E. The plate 7 locks the front claw portions 7B and 7C to a pair of front end portions extending forward of the base 41, and the rear claw portions 7D and 7E to the side surfaces of the base 41 so that the plate body 7A is the base. The base 41 is mounted so as to be positioned on the surface 41A. On the upper surface of the base 41, a step corresponding to the rear claw portions 7D and 7E is provided with a step that is higher in the front of the base 41 and lower in the rear. When the plate 7 is mounted on the base 41, the small protrusions 7d and 7e of the rear claw portions 7D and 7E are in contact with the step, thereby preventing the plate 7 from coming out forward. That is, in the longitudinal direction of the base 41, the plate 7 is held in such a manner that the base 41 is sandwiched between the front claws 7B and 7C and the small protrusions 7d and 7e. Further, in a direction orthogonal to the longitudinal direction of the base 41, the plate 7 is held in such a manner that the base 41 is sandwiched between the rear claw portions 7D and 7E and the small protrusions 7b and 7c. When the plate 7 is attached to the base 41, the lower surface of the plate is a contact surface with the material to be cut. In order to reduce the frictional force with the material to be cut, a low friction agent is applied to the lower surface of the plate.

  The plate 7 further includes a pair of slide portions 7F and 7G that can protrude rearward from the rear end of the plate body 7A and can be retracted into the plate body 7A. FIG. 7 is a side view of the jigsaw 1 when the slide portions 7F and 7G are projected, and FIG. 8 is a view showing the base surface 41A of the base 41. FIG. 9 is a cross-sectional view taken along the line AA in FIG. The slide portions 7F and 7G are formed in a band shape and are accommodated in the plate body 7A in FIG. Groove portions 7H and 7I are formed at the rear ends of the slide portions 7F and 7G, respectively. The operator puts the fingertips on the groove portions 7H and 7I and causes the slide portions 7F and 7G to protrude rearward from the plate body 7A. When the plate 7 is mounted on the base 41 and the slide portions 7F and 7G protrude from the plate body 7A, the rear ends of the slide portions 7F and 7G are more forward than the rear end of the base 41 as shown in FIG. Located in. When the slide portions 7F and 7G are projected and used, the surface of the slide portions 7F and 7G on the side opposite to the housing 2 is a contact surface with the material to be cut. In order to reduce the frictional force with the material to be cut, a low friction agent is applied to the surface on the side opposite to the housing 2 of the slide portions 7F and 7G.

  The anti-slip portion 8 is provided on the upper side of the front claw portions 7B and 7C. The lower end of the anti-slip portion 8 is located above the lower surface of the plate body 7A. The anti-slip portion 8 has a shape that protrudes upward and is inclined rearward, and has a higher friction coefficient than the base surface 41 </ b> A of the base 41 and the plate 7.

  Returning to FIG. 2, the motion conversion mechanism 5 mainly includes a gear portion 51, a weight portion 52, an engagement pin 53, and a plunger 54. The gear portion 51 meshes with the pinion gear 31 </ b> A and is rotatably supported by the gear cover 4 by a support shaft 50 extending forward from the gear cover 4. The weight part 52 is disposed in front of the gear part 51 and supported by the support shaft 50. The weight 52 functions as a counterweight by moving in the direction opposite to the plunger 54 and reduces vibration during operation of the jigsaw 1.

  The engaging pin 53 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 53 protrudes forward in a state different from the output shaft 31 and parallel to the output shaft 31.

  The plunger 54 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. Specifically, it can be rotated around a shaft (rotation shaft 44 described later) extending in the left-right direction. The plunger 54 includes a pin receiving portion 54A and a blade holding portion 54B.

  The pin receiving portion 54A is provided at a substantially central portion in the vertical direction of the plunger 54, has a substantially U-shape when viewed from the side, and is disposed so that the U-shaped opening faces rearward. 54 A of pin receiving parts are extended in the left-right direction, and the engaging pin 53 is inserted. The engaging pin 53 is allowed to move in the left-right direction within the groove of the pin receiving portion 54 </ b> A and is restricted from moving in the vertical direction, so that the pin receiving portion 54 </ b> A moves up and down according to the movement of the engaging pin 53. 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 54 </ b> A has a depth enough to hold the engagement pin 53 even when the plunger 54 rotates around the rotation shaft 44.

  The blade holding portion 54B is provided at the lower end portion of the plunger 54 and holds the blade 6 in a detachable manner. In the top view, the center of the plunger 54 and the center position of the blade 6 substantially coincide.

  The plunger 54 is supported by a plunger guide 43 so as to be slidable in the vertical direction at a substantially central portion in the vertical direction. The plunger guide 43 is supported by the gear cover 4 at the upper portion thereof so as to be rotatable about a rotation shaft 44 extending in the left-right direction. When the plunger guide 43 rotates about the rotation shaft 44, the plunger 54 and the blade 6 also rotate about the rotation shaft 44. Thereby, the plunger 54 and the blade 6 can follow the orbital operation of the orbital mechanism 9.

  The orbital mechanism unit 9 mainly includes a roller holder 91, a roller 92, and a switching unit 93. As shown in FIG. 1, the roller holder 91 is substantially L-shaped when viewed from the side, and is supported by the gear cover 4 so as to be rotatable about a support portion 94. The roller 92 is located at the front end portion of the roller holder 91 and supports the roller 92 in a rotatable manner. In the roller 92, a groove recessed inward in the radial direction is formed over the entire circumference, and is in contact with the back surface of the blade 6 in the groove. The operation amount of the orbital mechanism unit 9 can be adjusted by operating the switching unit 93.

  Next, the operation of the jigsaw 1 will be described. The motor 3 rotates by connecting the power cable 26 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 54 and the blade 6, and the blade 6 moves up and down. At the same time, the roller holder 91 rotates around the support portion 94. When the roller 92 presses the blade 6, the blade 6 also rotates about the rotation shaft 44. By the vertical movement of the blade 6 and the rotation of the roller holder 91, the tip portion of the blade 6, that is, the blade portion 6A operates (orbital operation) so as to draw a substantially elliptical locus. When the operator releases the trigger 22A, the jigsaw 1 stops.

  When the jigsaw 1 is operated as described above to cut the material to be cut straight from the peripheral edge, when the material to be cut is difficult to scratch or when the material to be cut may be damaged, the base 41 It is preferable to perform the cutting operation without mounting the plate 7. The operator grasps the handle 21 of the jigsaw 1 and places the front end of the base surface 41A so as to press the workpiece, and the blade 6 is placed at the cutting start position located at the peripheral portion of the workpiece. The part 6A is brought into contact. Then, the operator turns on the trigger 22A and cuts the material to be cut by the blade 6 that moves up and down while pushing the main body of the jigsaw 1 in the cutting direction. At this time, the base surface 41A slides on the material to be cut in the cutting direction. Since the jigsaw 1 operates in a state where the entire base surface 41A is pressed against the material to be cut, the posture of the tool main body is stabilized and can be slid smoothly on the material to be cut with low friction. Therefore, the material to be cut can be cut with good accuracy.

  Further, when performing straight cutting so as not to damage the material to be cut, it is preferable to perform the cutting work by mounting the plate 7 on the base 41 and projecting the slide portions 7F and 7G from the plate body 7A. . In this case, since the plate main body 7A and the slide portions 7F and 7G slide on the material to be cut, the jigsaw 1 can cut the material to be cut with good accuracy while the posture of the tool main body is stable. . Further, since the low friction agent is applied in advance to the lower surface of the plate body 7A and the contact surfaces of the slide portions 7F and 7G with the material to be cut, the jigsaw 1 can slide smoothly on the material to be cut. Cutting is possible without damaging the surface of the material to be cut.

  On the other hand, when cutting the material to be cut, particularly when cutting a material to be cut which is easy to bend such as a plywood plate, the plate 7 is mounted on the base 41 and the slide portions 7F and 7G are stored in the plate body 7A. It is preferable to perform the cutting operation. Curve cutting by the jigsaw 1 will be described with reference to FIGS. 10 and 11. FIG. 10 is a view for explaining curving of the workpiece 100 by the jigsaw 1, and FIG. 11 is a cross-sectional view taken along the line BB in FIG. 10.

  Prior to the cutting operation, the operator attaches the plate 7 to the base 41 of the jigsaw 1. First, the front claws 7B and 7C are applied to the base 41 so that the small protrusions 7b and 7c enter the recesses of the base 41, and the plate 7 is rotated in a direction in which the rear claws 7D and 7E approach the base 41. When the small projections 7d and 7e of the rear claw portions 7D and 7E are in contact with the lower surface of the base 41, the rear claw portions 7D and 7E are deformed so as to expand elastically and get over the side surface of the base 41. When the small protrusions 7d and 7e reach the stepped portion on the upper surface of the base 41, the shape of the rear claw portions 7D and 7E returns to the base, the small protrusions 7d and 7e come into contact with the step, and the plate 7 is mounted. The slide portions 7F and 7G are preferably accommodated in the plate body 7A without protruding.

  The operator grasps the handle 21 of the jigsaw 1, places the front end portion of the surface of the plate body 7 </ b> A on the side opposite to the housing 2 on the workpiece 100, and starts cutting at the peripheral portion of the workpiece 100. The blade portion 6A of the blade 6 is brought into contact with the position 100S. Then, while pushing the main body of the jigsaw 1 in the cutting direction, the material to be cut is cut by the blade 6 that moves up and down. At this time, the plate lower surface of the plate body 7A slides on the workpiece 100. The rear end of the lower surface of the plate is located behind and below the center of gravity G of the jigsaw 1 main body and in the vicinity below the center of gravity G. Therefore, the weight of the jigsaw 1 main body is added to the workpiece 100 via the plate lower surface, the posture of the jigsaw 1 main body can be stabilized without wobbling, and the length of the plate lower surface is made smaller than the base 41. can do. Further, as shown in FIG. 1, the rear portion of the base surface 41A of the base 41 is positioned above the lower surface of the plate by the thickness δ of the plate body 7A. Therefore, the base surface 41A of the base 41 and the workpiece 100 are not in contact with each other, and a gap corresponding to the thickness δ of the plate body 7A is generated between them.

  As the cutting operation proceeds, the cut portions 100A and 100B of the material to be cut 100 are bent. When the cutting operation has progressed to the position shown in FIG. 10, the weight of the jigsaw 1 body and the pressing force by the operator are added to the cut portion 100A of the material to be cut 100 via the abutting plate body 7A. Deflection occurs. On the other hand, almost no weight or pressing force is applied to the cut portion 100B, and the bending that occurs in the cut portion 100B is smaller than the bending that occurs in the cut portion 100A. As a result, as shown in FIG. 11, a step of δ1 occurs in the cut portion 100C located between the cut portion 100A and the cut portion 100B of the workpiece 100.

  In this state, when an operator turns the front of the jigsaw 1 in the left direction in FIG. 10 to further cut the workpiece 100 along a curve that turns counterclockwise, the jigsaw 1 faces the rear in FIG. Shake in the direction. At this time, the gap δ is generated between the rear of the base 41 and the workpiece 100 as described above. Therefore, when the gap δ is larger than the step δ1, the rear of the base 41 does not come into contact with the cut portion 100B when exceeding the step generated in the cutting portion 100C. Therefore, the jigsaw 1 can proceed with the cutting operation by smoothly changing the traveling direction of the main body.

  As described above, the cutting operation can be smoothly performed even when the cut portion has a step when the material to be cut is cut by a curve.

  Next, the case of performing the window extraction work of the workpiece 100 using the jigsaw 1 will be described with reference to FIGS. Here, the window extraction operation is a cutting operation performed by starting to cut the material to be cut from a position other than the peripheral portion.

  Prior to the window opening operation, the operator attaches the plate 7 to the base 41 of the jigsaw 1. Then, as shown in FIG. 12, the operator holds the handle 21 and tilts the upper part of the main body of the jigsaw 1 forward, and presses the anti-slip portion 8 provided at the front end of the plate 7 against the workpiece 100, The tip of the blade portion 6A of the blade 6 is brought into contact with the cutting start position. At this time, the anti-slip portion 8 has a higher coefficient of friction than the base 41 and the plate 7, and has a shape inclined toward the rear and is made of an elastically deformable material. Regardless of this, it is possible to prevent sliding on the workpiece 100.

  The jigsaw 1 cuts into the workpiece 100 by turning on the trigger 22 </ b> A and reciprocating the blade 6 with the anti-slip portion 8 pressed against the workpiece 100. While continuing the reciprocating motion of the blade 6, as shown in FIG. 13, the rear portion of the main body of the jigsaw 1 is slowly lowered with the anti-slip portion 8 as a fulcrum, and the workpiece 100 is drilled.

  When the drilling is completed, as shown in FIG. 14, the operator makes the lower surface of the plate 7 abut against the workpiece 100 and presses the main body of the jigsaw 1 in the cutting direction with the blade 6 moving up and down. Cut the workpiece. Since the non-slip portion 8 is located above the lower surface of the plate, the lower surface of the plate does not contact the material to be cut 100 even when the plate lower surface slides on the material 100 to be cut. Accordingly, the work to be cut can be continuously performed even after drilling without removing the plate.

  As described above, the positioning can be performed accurately at the time of drilling, and the cutting operation can be continued after the drilling, so that a smooth and quick window extraction operation can be performed.

  As described above, in the present embodiment, the detachable plate 7 is provided on the base surface 41A of the base 41. Therefore, when cutting a curve, the plate 7 is attached to the base 41 to perform a cutting operation. Even when a step is generated in the cut portion of the material to be cut, the back of the base 41 can be moved on the material to be cut without contacting the material to be cut, thereby improving workability. Further, since the plate 7 is fixed to the base 41 by the claw portions 7B, 7C, 7D, and 7E, the plate 7 can be easily attached and detached without using a tool or the like according to the type of the material to be cut and the work content. It becomes possible. Therefore, convenience is improved. Furthermore, since the non-slip portion 8 provided at the front end of the plate 7 can be fixed without sliding on the material to be cut 100, accurate positioning can be performed at the start of the window extraction operation. Therefore, it is possible to smoothly open the window with good accuracy, and further improvement of workability is realized.

  Next, a jigsaw according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the shape of the base is different from that of the first embodiment. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 15 is a diagram showing a base surface of a jig 141 base according to the second embodiment of the present invention. The base 141 is formed with a pair of grooves 141D and 141E at the center of the side surface. The groove portions 141D and 141E are formed at corresponding positions so that the claw portions 7D and 7E provided at the rear end of the side surface of the plate 7 can be engaged.

  By forming the base 141 as described above, the claw portions 7D and 7E are engaged without protruding from the side surface of the base 141. Therefore, even when the plate 7 is mounted on the base 141 and cutting is performed, Contact of the parts 7D and 7E with the material to be cut is prevented. Therefore, the material to be cut can be smoothly moved to cut the material to be cut smoothly.

  Next, a jigsaw according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the shape of the plate is different from the above-described embodiment. In addition, about the structure same as embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 16 is a side view showing the appearance of the jigsaw 201 according to the third embodiment of the present invention, and FIG. 17 is a view showing the base surface 41A of the jigsaw 201. A plate 207 is fixed to the base 41 with screws 271. In the present embodiment, the plate 207 has a pair of claw portions 207B and 207C at the front end, but no claw portion is provided at the rear end of the side surface.

  By screwing the plate 207 to the base 41 as described above, the plate 207 can be fixed without providing a claw portion on the side surface of the plate 207. Therefore, the plate 207 is attached to the base 41 and the cutting operation is performed. Also in this case, contact of the plate 207 with the material to be cut is prevented. Therefore, the jigsaw 201 can smoothly move on the material to be cut and smoothly cut the material to be cut.

  In the present embodiment, a pair of claw portions 207B and 207C are provided at the front end of the plate 207, but a configuration in which these claw portions 207B and 207C are not provided is also possible. In that case, the anti-slip | skid part 8 will be arrange | positioned at the front end of the base 41 as described in 4th Embodiment.

  Next, a jigsaw according to the fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the configuration in which the anti-slip portion is provided on the base is different from the above-described embodiment. In addition, about the structure same as embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 18 is a side view showing an appearance of a jigsaw 301 according to the fourth embodiment of the present invention. As shown in FIG. 18, the non-slip portion 308 is directly fixed to the front end of the base 341. With this configuration, the work to be cut can be drilled without mounting the plate 7 provided with the anti-slip portion 8 on the base 341. For example, a straight cut can be made on the work to be cut. When the window removal operation is performed only by this, a quick operation can be performed. Further, by screwing a plate without a claw portion to the base surface of the base 341, an operation requiring a plate can be performed.

  As described above, by providing the anti-slip portion 8 so as not to protrude from the sliding surface (the lower surface of the base 41 or the lower surface of the plate 7) with respect to the material to be cut, a quick cutting operation and a window extraction operation at the time of normal cutting It is possible to achieve both slip prevention.

1 Jigsaw 2 Housing 3 Motor 4 Gear cover 6 Blade 6A Blade part 7 Plate 7A Plate body 7B, 7C Front claw part 7D, 7E Rear claw part 7F, 7G Slide part 7H, 7I Groove part 8 Non-slip part 21 Handle 22A Trigger 41 Base 41A Base surface 41B insertion part

Claims (13)

A housing;
A motor housed in the housing;
A blade capable of being attached to the tip, and driven by the motor to reciprocate;
A base attached to the housing and provided to move on the workpiece together with the housing;
A cutting tool comprising a plate that is detachable from the base so as to be positioned on a base surface of the base opposite to the housing, and is shorter than the base surface in a cutting direction.   The cutting tool according to claim 1, wherein when the housing is on the upper side and the base is on the lower side, the rear end of the plate in the cutting direction is located near the lower center of the center of gravity of the tool body.   The cutting tool according to claim 1, wherein the plate has a claw portion that is locked to the base.   The said claw part is provided in the cutting direction front end of the said plate, latches to the cutting direction front end of the said base, and fixes the said plate with respect to the said base so that attachment or detachment is possible. Cutting tool.   The said claw part is provided in the cutting direction rear-end part of the said plate, latches to the side surface of the said base, and fixes the said plate with respect to the said base so that attachment or detachment is possible. Cutting tool.   The cutting tool according to claim 5, wherein a groove portion with which the claw portion engages is formed on the side surface of the base.   The cutting tool according to claim 1, wherein the plate is fixed to the base by screws.   The base is formed with a substantially U-shaped insertion portion for allowing the blade to pass therethrough and opened forward in the cutting direction, and the plate is formed in a substantially U-shape so as to cover a front side portion of the base surface in the cutting direction. The cutting tool according to claim 1.   The said plate has a plate main body and a pair of protrusion part which can protrude back in the cutting direction with respect to the said plate main body, and can be retracted in the said plate main body. A cutting tool according to claim 1.   The cutting tool according to any one of claims 1 to 9, wherein the base is formed of a steel material.   The cutting tool according to any one of claims 1 to 10, wherein the plate is formed of a resin.   The cutting tool according to any one of claims 1 to 11, wherein a low friction agent is applied to a contact surface of the plate with the material to be cut. The cutting tool according to any one of claims 1 to 12, further comprising a non-slip portion at a front end of the plate in a cutting direction.

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