Nibbler

Abstract

To provide a nibbler of high workability.SOLUTION: In a nibbler 1, a die holder 52 extends down from a gear case 12, and a dust collection case 80 is fitted to an attachment 60 of the die holder 52. The dust collection case 80 is rigid enough to resist deformation caused by self weight. The outer diameter of the dust collection case 80 is set twice as large as or smaller than that of the die holder 52. Specifically, the outer diameter of the dust collection case 80 is set equal to or smaller than that of the attachment 60. Thus, the physique of the dust collection case 80 in a radial direction can be downsized, and the workability of the nibbler 1 can be improved.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a nibbler. [Background technology]

[0002] In the nibbler described in the following Patent Document 1, a mounting tool is attached to the lower end of the die holder, and a dust collector is attached to the mounting tool. A plastic bottle or the like is used as the dust collector, and the mouth of the plastic bottle is attached to the mounting tool. In this way, the dust collector is disposed below the die holder, and chips generated during the cutting process of the nibbler can be collected in the dust collector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-21980 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned nibbler, the size of the dust collector is relatively large, and this may deteriorate the workability during cutting. For example, when forming a predetermined punched portion in a workpiece using a nibbler, a pilot hole for inserting a die holder is formed in advance in the workpiece. Then, the die holder is inserted into the pilot hole, and the workpiece is placed between the die and the punch. Then, the workpiece is cut by the nibbler to form the predetermined punched portion in the workpiece.

[0005] Here, if the size of the dust collector becomes large, the dust collector attached to the die holder may not be able to pass through the pilot hole. In this case, it is necessary to remove the dust collector from the die holder, insert the die holder into the pilot hole, and then attach the dust collector to the die holder. This makes the work during cutting complicated, and the workability of the nibbler may deteriorate. In addition, as another problem, when a flexible dust collector (for example, a cloth dust collection bag) is used, the shape and position of the dust collector may change depending on the attitude of the nibbler, making it difficult to pass through the pilot hole, or it may come into contact with the workpiece, which may deteriorate the workability. In addition, as another problem, if the inside of the dust collector becomes full of the processed pieces, the processed pieces may overflow, or the dust collector may be damaged or deformed due to the load applied to the dust collector during processing through the processed pieces, which may deteriorate the workability. In addition, as another problem, when punching with the nibbler, the processed pieces generate heat, and the dust collector may be damaged or deformed due to the heat, which may deteriorate the workability.

[0006] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a nibbler with good operability. [Means for solving the problem]

[0007] One or more embodiments of the present invention are a nibbler comprising: a motor housing that accommodates a motor; a gear case arranged on the front side of the motor housing; a die holder formed in a cylindrical shape with an axial direction in the vertical direction and extending downward from the gear case, into which a punch is inserted so as to be movable in the vertical direction and which holds a die; a transmission mechanism that is housed in the gear case and transmits the driving force of the motor to the punch; and a dust collection case connected to a lower end of the die holder, formed in a cylindrical shape with an axial direction in the vertical direction, and having a dust collection section that collects inside the dust collection case the chips generated during cutting by the punch and the die, wherein the dust collection case is configured such that its axial direction is along the extension direction of the die holder even when the dust collection case is horizontal, and the outer diameter of the dust collection case is less than twice the outer diameter of the die holder.

[0008] In one or more embodiments of the present invention, the dust collecting portion is located forward of the rear end of the gear case.

[0009] In one or more embodiments of the present invention, one of the die holder and the dust collection case is formed with a male threaded portion for connecting the die holder and the dust collection case, and the other of the die holder and the dust collection case is formed with a female threaded portion that screws into the male threaded portion, and the dust collection portion is a nibbler located inside the female threaded portion when viewed from the top and bottom direction.

[0010] In one or more embodiments of the present invention, the die holder includes a die holder main body extending in the vertical direction and a holding member removably attached to the lower end of the die holder main body, and the dust collection case is a nibbler held by the holding member.

[0011] In one or more embodiments of the invention, the holding member is a nibbler that is removably attached to the die holder body in a tool-less manner.

[0012] One or more embodiments of the present invention are a nibbler in which the holding member has a claw portion, and the claw portion engages with the die holder body to restrict downward movement of the holding member.

[0013] In one or more embodiments of the present invention, the holding member has a movement restricting portion, The movement restricting portion abuts against the die holder main body, thereby restricting the upward movement of the holding member.

[0014] One or more embodiments of the present invention are a nibbler in which the holding member has a rotation regulating portion, and the rotation regulating portion abuts against the die holder main body, thereby regulating the relative rotation of the holding member about an axis in the vertical direction with respect to the die holder main body.

[0015] In one or more embodiments of the present invention, the claw portion includes a front claw portion located forward relative to the axis of the holding member and a rear claw portion located rearward relative to the axis, and the rear claw portion is located offset from the axis in the left-right direction.

[0016] In one or more embodiments of the present invention, the dust collection case is a nibbler having a viewing window that allows viewing of the inside of the dust collection case.

[0017] One or more embodiments of the present invention are a nibbler in which the dust collection case is constructed from a single member, and the viewing window connects the inside and outside of the dust collection case.

[0018] In one or more embodiments of the present invention, the viewing window is a nibbler constituted by a plurality of through holes formed in the dust-collecting case, or a metal mesh member integrally formed with the dust-collecting case.

[0019] One or more embodiments of the present invention are directed to a nibbler in which a rib is formed on the outer periphery of the dust collection case, surrounding the viewing window.

[0020] In one or more embodiments of the present invention, the holding member is a nibbler configured to include a first mounting portion for mounting the dust collection case, and a second mounting portion configured to be capable of mounting a dust collector having a different shape than the dust collection case.

[0021] In one or more embodiments of the present invention, a nibbler is provided in which the dust collection case has a male threaded portion for connecting the die holder to the dust collection case, the die holder has a female threaded portion that screws into the male threaded portion, and the female threaded portion is configured to be able to attach a commercially available beverage bottle with its cap removed in place of the dust collection case. Effect of the Invention

[0022] According to one or more embodiments of the present invention, a nibbler that is easy to use can be provided. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a side view of the nibbler according to the embodiment, seen from the left side. [Diagram 2] FIG. 2 is a front view of the nibbler shown in FIG. 1 as seen from the front side. [Diagram 3] 2 is a cross-sectional view from the left side showing the inside of the nibbler shown in FIG. 1. [Figure 4] 4 is an enlarged cross-sectional view showing the periphery of a punch mechanism shown in FIG. 3. [Diagram 5] 5 is an exploded perspective view of the punch mechanism shown in FIG. 4, seen from diagonally below and to the left. [Figure 6] 6(A) is a front view of the punch mechanism shown in FIG. 5 as seen from the front side, and (B) is a side view of the punch mechanism of (A) as seen from the left side. [Figure 7] 7 is a cross-sectional view (cross-sectional view taken along line 7-7 in FIG. 6(B)) showing the inside of the attachment shown in FIG. 6(B) as seen from the front side. [Figure 8] 8 is a cross-sectional view (cross-sectional view taken along line 8-8 in FIG. 6(B)) showing the inside of the dust-collection case shown in FIG. 6(B) as seen from above. [Figure 9] 6 is a perspective view of the attachment shown in FIG. 5, seen from diagonally above and to the left. FIG. [Figure 10] (A) is a front view seen from the front side showing the state in which a dust collection bag is attached to the attachment instead of the dust collection case, and (B) is a side view seen from the left side showing the state in which the dust collection bag in (A) is attached to the attachment. [Figure 11] FIG. 11 is an exploded perspective view showing a state in which the dust-collecting bag shown in FIG. 10(A) is removed from the attachment. [Figure 12] 13 is a side view from the left side showing a state in which a plastic bottle is attached to the attachment instead of the dust collection case. FIG. [Figure 13]7 is a side view from the left side showing a modified example of the dust-collection case shown in FIG. 6 attached to an attachment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The nibbler 1 according to this embodiment will be described below with reference to the drawings. Note that the arrows UP, FR, and LH shown appropriately in the drawings respectively indicate the upper side, front side, and left side of the nibbler 1. In the following description, when the up-down, front-back, and left-right directions are used, they refer to the up-down, front-back, and left-right directions of the nibbler 1 unless otherwise specified.

[0025] 1 to 3, the nibbler 1 extends in the front-rear direction. A punch mechanism 50 protruding downward is provided at the front end of the nibbler 1, and a die 70 and a punch 72 of the punch mechanism 50 cut the workpiece. The nibbler 1 includes a housing 10, a motor 30, a transmission mechanism 40, a controller 18, and the punch mechanism 50.

[0026] (About Housing 10) The housing 10 constitutes the outer shell of the upper part of the nibbler 1. The housing 10 is formed as a hollow column extending in the front-rear direction as a whole. The housing 10 is configured to include a motor housing 11 extending in the front-rear direction and a gear case 12 forming the front end part of the housing 10. The motor housing 11 is formed in a substantially bottomed cylindrical shape that is open to the front side. The motor housing 11 is constituted by housing members divided into two in the left-right direction, and the motor housing 11 is formed by fastening the housing members together. The middle part of the motor housing 11 in the front-rear direction is configured as a grip part that is gripped by an operator.

[0027] A connecting portion 11A is formed at the front end of the motor housing 11, protruding radially outward, and the connecting portion 11A is formed in a substantially rectangular shape when viewed from the front side. A switch lever 14 (see FIG. 1) is provided at the left side of the motor housing 11. The switch lever 14 is connected to the motor housing 11 so as to be slidable in the front-rear direction. Specifically, the switch lever 14 is disposed at the OFF position shown in FIG. 1, and when the switch lever 14 is slid from the OFF position to the ON position on the front side, a motor 30 (described later) is driven to operate the nibbler 1.

[0028] A battery 16 is attached from above to the rear end of the motor housing 11, and is located on the rear side of the motor housing 11. The battery 16 is electrically connected to a controller 18 (see FIG. 3), and the controller 18 is disposed within the rear end of the motor housing 11.

[0029] The gear case 12 is formed in a hollow shape that is substantially triangular when viewed from the left-right direction and is open to the rear. A connected portion 12A is formed at the rear end of the gear case 12, and the connected portion 12A is formed in a substantially rectangular tubular shape that corresponds to the connecting portion 11A of the motor housing 11. The connecting portion 11A and the connected portion 12A are butted against each other in the front-rear direction, and four corners of the connected portion 12A are fastened and fixed to the connecting portion 11A by screws SC1.

[0030] As shown in Figs. 4 and 5, the lower end of the gear case 12 is provided with a holder mounting portion 12B for mounting a die holder 52, which will be described later. The holder mounting portion 12B is formed in a substantially rectangular parallelepiped block shape with the longitudinal direction being the front-rear direction, and protrudes downward from the gear case 12. A holder mounting hole 12C is formed in the front part of the holder mounting portion 12B so as to penetrate in the up-down direction, and the inside and outside of the gear case 12 are communicated by the holder mounting hole 12C. A holder mounting screw portion 12D is formed in the rear part of the holder mounting portion 12B so as to penetrate in the front-rear direction, and the inside of the holder mounting screw portion 12D is communicated with the inside of the holder mounting hole 12C. A female thread is formed on the inner periphery of the holder mounting screw portion 12D. A holder set screw 20 is screwed into the holder mounting screw portion 12D, and the holder set screw 20 is configured as a hexagon socket set screw. The tip of the holder setscrew 20 is formed into a substantially conical shape, and is disposed within the holder mounting hole 12C.

[0031] (Regarding motor 30) As shown in FIG. 3, the motor 30 is configured as a brushless motor and is accommodated in the front part of the motor housing 11. The motor 30 has a rotating shaft 30A, and the rotating shaft 30A is arranged with the front-rear direction as the axial direction. The rear end of the rotating shaft 30A is rotatably supported by a first motor bearing 31 held in the motor housing 11, and the front end part of the rotating shaft 30A is rotatably supported by a second motor bearing 32 held in the gear case 12. The motor 30 is electrically connected to the controller 18. A fan 33 is provided on the front end part of the rotating shaft 30A at the rear side of the second motor bearing 32 so as to be integrally rotatable. The fan 33 is configured as an axial flow fan, and the fan 33 generates an air flow that flows forward inside the motor housing 11. The front end of the rotating shaft 30A is arranged in the gear case 12, and a gear part 30B is formed on the outer periphery of the front end of the rotating shaft 30A.

[0032] (Regarding the transmission mechanism 40) The transmission mechanism 40 is housed in the gear case 12. The transmission mechanism 40 includes a first gear 41, a crankshaft 43, a second gear 44, a connecting rod 45, and a piston 46. The first gear 41 is configured as a two-stage gear with the front-rear direction as the axial direction, and is rotatably supported by the gear case 12. That is, the first gear 41 includes a large diameter gear portion 41A and a small diameter gear portion 41B having a smaller diameter than the large diameter gear portion 41A, and the small diameter gear portion 41B is disposed in front of the large diameter gear portion 41A. The first gear 41 is disposed on the right side of the rotating shaft 30A of the motor 30, and is engaged with the gear portion 30B of the motor 30.

[0033] The crankshaft 43 is disposed with its axial direction aligned in the front-rear direction, and both ends of the crankshaft 43 are rotatably supported by the gear case 12. The crankshaft 43 is located diagonally below and to the left of the first gear 41. A second gear 44 is provided at the rear of the crankshaft 43 so as to be integrally rotatable therewith, and the second gear 44 is meshed with the small diameter gear portion 41B of the first gear 41. A crankpin portion 43A is provided at the front of the crankshaft 43, and the crankpin portion 43A is disposed at a position eccentric to the axis of the crankshaft 43.

[0034] The connecting rod 45 extends in the vertical direction. A rod connecting portion 45A is provided at the upper end of the connecting rod 45, and the rod connecting portion 45A is formed in a substantially cylindrical shape with the axial direction being the front-rear direction. The crank pin portion 43A of the crankshaft 43 is rotatably inserted into the rod connecting portion 45A, and the upper end of the connecting rod 45 is supported by the crankshaft 43.

[0035] The piston 46 is formed in a substantially cylindrical shape with the vertical direction as its axial direction. The piston 46 is supported by a die holder 52 (described later) below the connecting rod 45 so as to be movable in the vertical direction. A connecting groove 46A that is open to the upper side is formed at the upper end of the piston 46, and the connecting groove 46A penetrates in the left-right direction. The lower end of the connecting rod 45 is inserted into the connecting groove 46A and is connected to the upper end of the piston 46 by a piston pin 47 whose axial direction is the front-rear direction so as to be relatively rotatable. As a result, when the motor 30 rotates, the driving force of the motor 30 is transmitted to the piston 46 by the transmission mechanism 40, and the piston 46 reciprocates in the vertical direction.

[0036] As shown in FIG. 4, a punch mounting hole 46B is formed in the center of the lower surface of the piston 46. The punch mounting hole 46B is formed in a concave shape that is open to the bottom, and is formed in a circular shape when viewed from the bottom. A punch mounting screw portion 46C is formed penetrating the bottom end of the piston 46 in the front-rear direction at the front side of the punch mounting hole 46B, and the inside of the punch mounting screw portion 46C and the inside of the punch mounting hole 46B are connected. A female thread is formed on the inner periphery of the punch mounting screw portion 46C. A punch set screw 48 is screwed into the punch mounting screw portion 46C, and the punch set screw 48 is configured as a hexagonal socket set screw. The tip of the punch set screw 48 is formed in a substantially conical shape and is disposed in the punch mounting hole 46B.

[0037] (Regarding punch mechanism 50) As shown in FIGS. 1 to 6, the punch mechanism 50 includes a die holder 52, a die 70, a punch 72, and a dust collection case 80. The die holder 52 includes a die 70, a punch 72, and a dust collection case 80. The die 70 includes a die holder 52, a die 70, a punch 72, and a dust collection case 80.

[0038] (Regarding die holder 52) The die holder 52 includes a die holder body 54 and an attachment 60 serving as a holding member. The die holder body 54 will be described below, and the attachment 60 will be described after the die 70 and punch 72 are described.

[0039] The die holder body 54 is formed in a substantially cylindrical shape with the vertical direction as the axial direction. The upper end of the die holder body 54 is inserted into the holder mounting hole 12C of the gear case 12 from below, and is fastened and fixed to the gear case 12 by the holder set screw 20. Specifically, a concave recess 54A (see FIG. 4) is formed at the rear end of the outer periphery of the upper end of the die holder body 54. The tip of the holder set screw 20 tightens the inner periphery of the recess 54A, and the die holder body 54 is fixed to the gear case 12. As a result, the die holder body 54 extends downward from the gear case 12. In addition, in the die holder body 54, the recess 54A is also formed on both left and right sides of the outer periphery of the die holder body 54. That is, three recessed portions 54A are formed in the die holder body 54, and the three recessed portions 54A are arranged at 90 degree intervals in the circumferential direction of the die holder body 54. This makes it possible to change the orientation of the die holder 52.

[0040] The lower end of the die holder body 54 is a holder portion 55, and the upper portion of the die holder body 54 above the holder portion 55 is a cylinder portion 56. The inside of the cylinder portion 56 is formed in a stepped hole shape (see FIG. 4). Specifically, the inside of the lower end of the cylinder portion 56 is a punch guide hole 56A, and the upper portion of the cylinder portion 56 above the punch guide hole 56A is a piston guide hole 56B. The diameter of the punch guide hole 56A is set smaller than the diameter of the piston guide hole 56B. The piston 46 described above is inserted into the piston guide hole 56B so as to be movable in the vertical direction, and the vertical movement of the piston 46 is guided by the cylinder portion 56. In addition, a plurality of inclined surfaces are formed at the lower end of the die holder body 54, and the lower end of the die holder body 54 is formed in a tapered shape by the inclined surfaces.

[0041] The holder portion 55 is formed in a substantially cylindrical shape with the thickness direction being the vertical direction. That is, the holder portion 55 is formed with a holder hole 55A penetrating in the vertical direction, and the holder hole 55A is located below the punch guide hole 56A of the cylinder portion 56. An inclined surface 55B (see FIG. 5) is formed on the upper surface of the rear portion of the holder portion 55 on the rear side of the holder hole 55A, and the inclined surface 55B is inclined downward as it approaches the rear side when viewed from the left-right direction. The inclined surface 55B is formed so that the front end of the inclined surface 55B protrudes slightly upward from the upper surface of the holder portion 55. The rear portion of the holder portion 55 (the inclined surface 55B) and the rear portion of the cylinder portion 56 are connected by a connecting fin 57. The connecting fin 57 is formed in a plate shape with the plate thickness direction being the left-right direction.

[0042] A cut surface 55C (see FIG. 5) is formed on the side surface of the front end of the holder part 55, and the cut surface 55C is formed along a plane perpendicular to the front-rear direction. That is, when viewed from below, the outer shape of the holder part 55 is cut out by the cut surface 55C. A pair of left and right screw insertion holes 55D (see FIG. 7) are formed penetrating the holder part 55 in the up-down direction, and the screw insertion holes 55D are respectively arranged on the left and right outer sides of the holder hole 55A.

[0043] (About Die 70) As shown in Figs. 1 to 7, the die 70 is formed in a substantially trapezoidal block shape with a thickness direction in the front-rear direction and a convex shape toward the upper side when viewed from the front side. The die 70 is disposed above the front part of the holder part 55 of the die holder main body 54, in front of the connecting fin 57. A fixing screw part 70A (see Fig. 7) is formed penetrating the die 70 in the vertical direction at a position corresponding to the screw insertion hole 55D of the holder part 55, and a female screw is formed on the inner periphery of the fixing screw part 70A. A fixing screw 74 inserted from below into the screw insertion hole 55D is screwed into the fixing screw part 70A, and the die 70 is fixed to the holder part 55 by the fixing screw 74. When the die 70 is fixed to the holder part 55, the front surface of the die 70 is disposed at a position one step lower to the rear side than the cut surface 55C of the holder part 55 (see Fig. 4). A die hole 70B is formed between a pair of fixing screw portions 70A and extends vertically through the die 70. The die hole 70B is arranged coaxially with a holder hole 55A of the holder portion 55 and a punch guide hole 56A of the cylinder portion 56. A rear portion of the holder hole 55A is cut out so that the holder hole 55A is open to the rear. The diameter of the die hole 70B is set slightly larger than the diameter of a punch 72, which will be described later.

[0044] (About Punch 72) As shown in FIG. 4, the punch 72 is formed in a generally cylindrical shape with the vertical direction as the axial direction. The upper part of the punch 72 is inserted into the punch mounting hole 46B of the piston 46 from below, and is fastened and fixed to the piston 46 by the punch set screw 48. Specifically, a concave recess 72A is formed on the outer periphery of the punch 72, and the tip of the punch set screw 48 fastens the inner periphery of the recess 72A, thereby fixing the punch 72 to the piston 46. As a result, when the nibbler 1 is operated, the punch 72 reciprocates in the vertical direction. Specifically, the punch 72 reciprocates between a top dead center position (position shown in FIGS. 1 to 4) and a bottom dead center position (not shown) lowered from the top dead center position.

[0045] The punch 72 is inserted into the punch guide hole 56A of the cylinder portion 56, and the punch guide hole 56A guides the movement of the punch 72 in the vertical direction. The diameter of the punch 72 is set to be slightly smaller than the diameter of the die hole 70B of the die 70. The lower end of the punch 72 is formed with a small diameter that is one step lower toward the inside in the radial direction and is disposed in the die hole 70B. That is, the lower end portion of the punch 72 is formed with a blade portion 72B formed in a stepped shape, and the blade portion 72B is located above the die hole 70B. When the punch 72 descends from the top dead center position to the bottom dead center position, the blade portion 72B is inserted into the die hole 70B. As a result, during cutting, the workpiece is disposed between the die 70 and the blade portion 72B of the punch 72, and the workpiece is sheared by the blade portion 72B of the punch 72 descending to the bottom dead center position and the edge of the die hole 70B, thereby performing cutting on the workpiece.

[0046] (About Attachment 60) 1 to 7 and 9, the attachment 60 is formed in a substantially stepped cylindrical shape with the vertical direction as the axial direction. Specifically, the attachment 60 includes an attachment body 62 constituting the upper part of the attachment 60, and a case attachment part 64 as a first attachment part constituting the lower end part of the attachment 60. The diameter of the case attachment part 64 is set to be larger than the diameter of the attachment body 62, and the case attachment part 64 constitutes the outermost diameter part of the attachment 60 and the outermost diameter part of the die holder 52. In addition, the case attachment part 64 is set to be equal to or smaller than twice the outer diameter of the holder part 55 which is the part of the die holder body 54 that holds the die 70.

[0047] The shape of the inner peripheral surface of the attachment body 62 as viewed from above is similar to the outer shape of the holder part 55 of the die holder 52, and the attachment body 62 is fitted onto the holder part 55 from below. That is, a rotation restriction wall 62A is formed as a rotation restriction part at the front end of the attachment body 62, and the rotation restriction wall 62A extends in the left-right direction with the plate thickness direction being the front-rear direction, and is disposed opposite the cut surface 55C of the holder part 55 in the front-rear direction. This restricts the relative rotation of the attachment 60 with respect to the die holder body 54 in the axial direction being the up-down direction.

[0048] The attachment body 62 is detachably mounted on the holder part 55 by so-called snap-fit ​​engagement. That is, the attachment 60 is attached to the holder part 55 without tools. Specifically, a front mounting hook 62B is formed as a claw part and a front claw part at the left-right center of the rotation restriction wall 62A of the attachment body 62. The front mounting hook 62B is formed in a column shape extending in the vertical direction, and the lower end of the front mounting hook 62B is connected to the attachment body 62. The front mounting hook 62B is configured to be elastically deformable in the front-rear direction. A hook part 62B1 is formed at the upper end of the front mounting hook 62B, which protrudes to the rear side. The front mounting hook 62B is disposed adjacent to the front side of the cut surface 55C of the holder part 55, and the hook part 62B1 is engaged with the front end of the upper surface of the holder part 55 in the vertical direction.

[0049] A pair of left and right rear mounting hooks 62C as claws and rear claws are formed at the rear end of the attachment body 62. The rear mounting hooks 62C are disposed at a position rear of the axis AL (see FIG. 9) of the attachment 60 and offset outward in the left-right direction with respect to the axis AL. The rear mounting hooks 62C are formed in a columnar shape extending in the vertical direction, and the lower end of the rear mounting hooks 62C is connected to the attachment body 62. The rear mounting hooks 62C are configured to be elastically deformable in the front-rear direction. A hook portion 62C1 is formed at the upper end of the rear mounting hook 62C, which protrudes forward, and the hook portion 62C1 engages with the inclined surface 55B of the holder portion 55 in the vertical direction. As a result, the hook portion 62B1 and the hook portion 62C1 restrict the downward movement of the attachment 60 relative to the holder portion 55. Furthermore, when a downward load of a predetermined value or more is applied to the attachment 60, at least one of the front mounting hook 62B and the rear mounting hook 62C elastically deforms, causing the attachment 60 to fall off from the die holder main body 54.

[0050] A pair of left and right first stopper portions 62D (see FIG. 9) are provided at the front end portion inside the attachment body 62 as movement restricting portions. The first stopper portions 62D are formed in a substantially columnar shape extending in the vertical direction and are connected to the inner peripheral surface of the front end portion of the attachment body 62. A second stopper portion 62E (see FIG. 9) is provided at the rear portion inside the attachment body 62 as a movement restricting portion. The second stopper portion 62E is formed in a substantially rectangular columnar shape extending in the horizontal direction, and both longitudinal ends of the second stopper portion 62E are connected to the inner peripheral surface of the attachment body 62. The upper surfaces of the first stopper portion 62D and the second stopper portion 62E are disposed adjacent to the lower side of the holder portion 55. As a result, the first stopper portion 62D and the second stopper portion 62E abut against the lower surface of the holder portion 55, restricting the upward relative movement of the attachment 60 with respect to the holder portion 55.

[0051] An attachment groove 62F is formed as a second attachment portion at a lower end portion of the outer periphery of the attachment body 62. The attachment groove 62F is formed in a groove shape that opens radially outward of the attachment body 62 and runs along the circumferential direction of the attachment body 62, and is formed in a portion of the attachment body 62 excluding the rear end portion. Although details will be described later, the attachment groove 62F is configured as an attachment portion for attaching a dust collection bag 100 (see Figs. 10 and 11) to the attachment 60 as a dust collector having a different form from the dust collection case 80 described later. The dust collection bag 100 will be described later.

[0052] As described above, the case mounting portion 64 constitutes the lower end of the attachment 60, and the diameter of the case mounting portion 64 is set to be larger than the diameter of the attachment body 62. That is, the case mounting portion 64 protrudes radially outward below the mounting groove portion 62F. This allows the case mounting portion 64 to function as a retainer for the dust collection bag 100 described later. A female screw portion 64A is formed on the inner periphery of the case mounting portion 64, and is configured so that the male screw portion 80A of the dust collection case 80 described later and the female screw portion 64A can be screwed together. In addition, the diameter of the inner periphery of the case mounting portion 64 and the shape of the female screw portion 64A are set so that the mouth of a commercially available plastic bottle 90 (see FIG. 12) as a beverage bolt can be screwed into the female screw portion 64A. That is, the case mounting portion 64 is configured so that the plastic bottle 90 can be attached to the die holder 52 instead of the dust collection case 80 described later.

[0053] (Regarding dust collection case 80) As shown in FIG. 1 to FIG. 8, the dust collection case 80 is molded from fiber-reinforced plastic (glass fiber-reinforced plastic obtained by mixing glass fiber with epoxy resin in this embodiment). The dust collection case 80 is formed in a generally bottomed cylindrical shape that is open to the top. A male screw portion 80A is formed on the outer periphery of the upper end of the dust collection case 80, and the male screw portion 80A is configured to be able to be screwed into the female screw portion 64A of the attachment 60. Thus, by screwing the male screw portion 80A into the female screw portion 64A, the dust collection case 80 is attached to the attachment 60 (die holder 52) and extends downward from the die holder 52. The size of the dust collection case 80 is set so that the entire dust collection case 80 overlaps the gear case 12 when viewed from below when the dust collection case 80 is attached to the attachment 60. That is, the dust collection case 80 is located rearward of the front end of the gear case 12, forward of the rear end of the gear case 12, and laterally inward of the outer ends of the gear case 12. In addition, the vertical length of the dust collection case 80 is set shorter than the vertical length of the die holder main body 54 of the die holder 52.

[0054] A flange portion 80B is formed at the upper end portion of the dust collection case 80, which protrudes radially outward from the male screw portion 80A, and the flange portion 80B is formed over the entire circumference of the dust collection case 80. The flange portion 80B constitutes the outermost diameter portion of the dust collection case 80, and the outer diameter of the flange portion 80B matches the outer diameter of the case mounting portion 64 of the attachment 60. The lower portion of the flange portion 80B is inclined. Specifically, the lower portion of the flange portion 80B has a shape that inclines upward as it goes radially outward. This inclined structure of the flange portion 80B can prevent the pilot hole and the dust collection case 80 from getting caught when the pilot hole is inserted. When the dust collection case 80 is attached to the die holder 52, the flange portion 80B is disposed adjacent to the lower side of the case mounting portion 64 of the attachment 60. That is, in this embodiment, the maximum outer diameter of the dust collection case 80 is set to be equal to or less than the maximum outer diameter of the die holder 52 (attachment 60), and the dust collection case 80 is attached to the die holder 52 so that the outer peripheral surface of the flange portion 80B and the outer peripheral surface of the case mounting portion 64 are flush with each other. From the viewpoint of miniaturizing the dust collection case 80, it is preferable to set the maximum outer diameter of the dust collection case 80 to be equal to or less than the maximum outer diameter of the attachment 60. However, for example, in order to increase the capacity of the dust collection case 80, the maximum outer diameter of the dust collection case 80 may be set to be equal to or less than twice the maximum outer diameter of the attachment 60. Alternatively, the maximum outer diameter of the dust collection case 80 may be set to be equal to or less than twice the maximum outer diameter of the holder portion 55 of the die holder main body 54. Note that the outer diameter is compared because the holder portion 55 has a cylindrical shape, but if the holder portion 55 is not cylindrical, it may be set to be equal to or less than twice the size in the front-rear and left-right directions.

[0055] The inside of the dust collection case 80 is a dust collection section 80C, which forms a dust collection space for collecting workpieces generated during cutting. The dust collection section 80C communicates with the die hole 70B of the die 70 via the attachment 60. As a result, during cutting by the nibbler 1, workpieces that fall through the die hole 70B of the die 70 are collected in the dust collection section 80C of the dust collection case 80. The dust collection section 80C is located radially inside the male screw section 80A when viewed from below.

[0056] A plurality of viewing windows 80D are formed penetrating the peripheral wall of the dust collection case 80 on both the left and right sides. As a result, the viewing windows 80D communicate the inside and outside of the dust collection case 80, and the inside of the dust collection case 80 can be viewed. That is, the collection state of the workpieces in the dust collection section 80C can be confirmed through the viewing windows 80D. In the viewing windows 80D, a plurality of viewing windows 80D arranged in the vertical direction are arranged in one row, and a plurality of rows (five rows in this embodiment) of the viewing windows 80D are arranged in the circumferential direction of the dust collection case 80 at predetermined intervals. In addition, the viewing windows 80D are arranged so that the vertical positions of the viewing windows 80D in adjacent rows are shifted. The viewing windows 80D are formed in a regular hexagonal shape, and the viewing windows 80D are arranged so that the intervals between the adjacent viewing windows 80D are constant. The size of the viewing window 80D is set so that the outer shape of the viewing window 80D is smaller than the outer diameter of (the blade portion 72B of) the punch 72. The portion (area) of the dust collection case 80 where the viewing window 80D is formed is defined as a window area 80E.

[0057] A pair of left and right ribs 80F are formed on the outer periphery of the dust-collecting case 80. The ribs 80F are formed in a substantially rectangular frame shape with the vertical direction as a longitudinal direction when viewed from the outside in the left-right direction, and surround the window area 80E (multiple viewing windows 80D). The height of the ribs 80F is set so that the ribs 80F protrude outward in the left-right direction from the outer periphery of the window area 80E of the dust-collecting case 80. That is, the ribs 80F form the outer left-right end of the portion of the dust-collecting case 80 that is lower than the flange portion 80B.

[0058] As described above, the dust collection case 80 is made of fiber-reinforced plastic. Therefore, even if the attitude of the nibbler 1 is changed, the shape of the dust collection case 80 is maintained. More specifically, even if the attitude of the nibbler 1 is changed so that the dust collection case 80 extends horizontally, the dust collection case 80 has enough rigidity not to be deformed by its own weight.

[0059] (Action and effect) Next, the operation and effects of this embodiment will be described.

[0060] In the nibbler 1 configured as described above, the die holder 52 extends downward from the gear case 12, and the attachment 60 constitutes the lower end of the die holder 52. The dust collection case 80 is attached to the attachment 60, and the dust collection case 80 extends downward from the die holder 52. Specifically, the male screw portion 80A provided at the upper end of the dust collection case 80 is screwed into the female screw portion 64A of the attachment 60. The dust collection case 80 is formed in a cylindrical shape that opens upward, and is molded from fiber-reinforced plastic. Therefore, even if the attitude of the nibbler 1 is changed so that the dust collection case 80 extends in the horizontal direction, the axial direction of the cylindrical dust collection case 80 is configured to be along the extension direction of the die holder 52. In other words, even if the dust collection case 80 is made horizontal, the attitude of the dust collection case 80 relative to the die holder 52 is maintained. The dust collection case 80 has such rigidity that the cylindrical shape does not deform under its own weight even if its direction or attitude is changed. In this embodiment, the dust collection case 80 is entirely made of fiber-reinforced plastic, but may be partially made of a material with high rigidity so long as the shape is maintained. For example, a dust collection case that is less susceptible to changes in shape in response to changes in posture may be obtained by attaching a resin or metal framework to a cloth dust collection bag. However, in terms of workability, it is more advantageous to form the entire dust collection case 80 from a material with high rigidity as in this embodiment.

[0061] When the nibbler 1 is cut, a workpiece is placed between the blade 72B of the punch 72 and the die 70. Then, the switch lever 14 is slid from the OFF position to the ON position to drive the motor 30. As a result, the driving force of the motor 30 is transmitted to the piston 46 by the transmission mechanism 40, and the punch 72 fixed to the piston 46 reciprocates between the top dead center position and the bottom dead center position. As a result, the blade 72B of the punch 72 is inserted into the die hole 70B of the die 70, and the workpiece is cut. Also, when the die 70 and the punch 72 are cut, the workpiece generated during cutting falls through the die hole 70B and is collected in the dust collection section 80C of the dust collection case 80.

[0062] When the dust collection case 80 is filled with workpieces and the cutting process is continued by the nibbler 1 in the full state of the workpieces, a downward load of a predetermined value or more acts on the dust collection case 80 and the attachment 60. Specifically, a pressing force from the punch 72 acts on the workpieces in the dust collection case 80, and a downward pressing force is applied to the dust collection case 80 through the punch 72. As a result, at least one of the front mounting hook 62B and the rear mounting hook 62C of the attachment 60 is elastically deformed outward in the front-rear direction, and the engagement state between the attachment 60 and the die holder main body 54 is released. As a result, the dust collection case 80 falls off from the die holder main body 54 together with the attachment 60. As a result, even if the cutting process is continued after the workpieces are full, it is possible to suppress an excessive increase in the load on the dust collection case 80. Therefore, it is possible to suppress damage to the dust collection case 80. Such a configuration for suppressing damage to the dust collection case 80 is one of the independent features of the present invention.

[0063] Here, in the nibbler 1, the outer diameter of the dust collection case 80 is set to be equal to or less than twice the outer diameter of the die holder 52. Specifically, the attachment 60 constitutes the outermost diameter portion of the die holder 52, and the outer diameter of the dust collection case 80 is set to be equal to or less than the outer diameter of the attachment 60. More specifically, the outer diameters of the dust collection case 80 and the attachment 60 are set to be equal to or less than twice the outer diameter of the holder portion 55 that holds the die 70. This allows the size of the dust collection case 80 in the radial direction to be reduced, and the workability of the nibbler 1 to be improved.

[0064] That is, when a hole is formed in a workpiece using the nibbler 1, a pilot hole for hole processing is formed in the workpiece in advance. Then, the edge of the pilot hole is placed between the die 70 and the blade portion 72B of the punch 72, and the workpiece is cut into a shape corresponding to the hole starting from the pilot hole, thereby forming the hole in the workpiece. At this time, by inserting the dust collection case 80 into the inside of the pilot hole, the edge of the pilot hole can be easily placed between the die 70 and the blade portion 72B of the punch 72. Here, for example, if the size of the dust collection case 80 in the radial direction becomes large, there are cases where the dust collection case 80 cannot be inserted into the pilot hole. In this case, it is necessary to insert the die holder 52 with the dust collection case 80 removed into the pilot hole, and then attach the dust collection case 80 to the die holder 52 (attachment 60). Or, it is necessary to form a pilot hole with a large diameter in the workpiece so that the dust collection case 80 can be inserted. For this reason, the work during cutting becomes complicated, and the workability of the nibbler 1 may deteriorate.

[0065] In contrast, in this embodiment, as described above, the outer diameter of the dust collection case 80 is set to be equal to or less than twice the outer diameter (size in the front-rear and left-right directions) of the die holder 52, so that the size of the dust collection case 80 in the radial direction can be reduced. As a result, when forming a hole in a workpiece using the nibbler 1, the dust collection case 80 can be inserted into the pilot hole of the workpiece, and the edge of the pilot hole can be easily positioned between the die 70 and the punch 72. In other words, when forming a hole in a workpiece using the nibbler 1, it is not necessary to remove the dust collection case 80 from the die holder 52. As a result, the complexity of the work during cutting can be suppressed, and the workability of the nibbler 1 can be improved. Note that the outer diameter of the dust collection case 80 only needs to be large enough to collect the processed pieces, but by configuring the dust collection case 80 to have an outer diameter that is at least about half the outer diameter of the die holder 52 (holder part 55), deterioration of dust collection performance and durability can be suppressed. That is, the size of the dust collection case 80 in the front-rear and left-right directions should be within the range of 0.5 to 2.0 times the outer diameter of the die holder 52 (holder portion 55).

[0066] Further, the dust collection section 80C of the dust collection case 80 is located inside the female screw section 64A of the attachment 60 when viewed from below. That is, when viewed from below, the dust collection section 80C is located radially inside the female screw section 64A, which is the attachment section of the dust collection case 80 in the die holder 52. This allows the size of the dust collection case 80 in the radial direction to be reduced while the dust collection section 80C is disposed radially inside the die holder 52 when viewed from below.

[0067] The die holder 52 includes a die holder main body 54 extending downward from the gear case 12, and an attachment 60 detachably attached to a holder portion 55 of the die holder main body 54. The dust collection case 80 is attached to and held by the attachment 60. As a result, as described above, for example, when the dust collection case 80 becomes full of machined pieces, the attachment 60 is configured to fall off the die holder main body 54, thereby preventing damage to the dust collection case 80.

[0068] Moreover, the attachment 60 is detachably attached to the die holder body 54 without using tools. Specifically, the attachment 60 has a front mounting hook 62B and a rear mounting hook 62C, and by fitting the attachment 60 onto the holder part 55 of the die holder body 54, the front mounting hook 62B and the rear mounting hook 62C are snap-fitted into the die holder body 54, and the attachment 60 is attached to the die holder 52. This improves the workability when attaching the attachment 60 to the die holder body 54.

[0069] Further, a first stopper portion 62D and a second stopper portion 62E are provided inside the attachment 60, and the first stopper portion 62D and the second stopper portion 62E abut against the holder portion 55 of the die holder main body 54 from below, restricting the upward movement of the attachment 60. This allows the first stopper portion 62D and the second stopper portion 62E to determine the vertical position of the attachment 60 when the attachment 60 is attached to the holder portion 55. This further improves the workability when attaching the attachment 60 to the die holder main body 54.

[0070] The attachment 60 also has a rotation restriction wall 62A, which is disposed to face the cut surface 55C of the die holder body 54 in the front-rear direction. As a result, the rotation restriction wall 62A comes into contact with the cut surface 55C, restricting the relative rotation of the attachment 60 with respect to the die holder body 54 in the axial direction that is the up-down direction. As a result, when the male screw portion 80A of the dust collection case 80 is screwed into the female screw portion 64A of the attachment 60, the attachment 60 can be prevented from rotating. Therefore, the workability when attaching the dust collection case 80 to the attachment 60 can be further improved.

[0071] Further, the front mounting hook 62B of the attachment 60 is located in front of the axis AL of the die holder 52, and the pair of left and right rear mounting hooks 62C are disposed in rear of the axis AL and in positions offset outward in the left-right direction with respect to the axis AL. This allows the attachment 60 to be snap-fitted to the holder part 55 by disposing the front mounting hooks 62B and the rear mounting hooks 62C in a well-balanced manner in the circumferential direction of the holder part 55.

[0072] In addition, the window area 80E of the dust collection case 80 is formed with a plurality of viewing windows 80D that allow the inside of the dust collection case 80 to be viewed. This allows the collection state of the workpieces in the dust collection case 80 to be confirmed. In particular, the dust collection case 80 is molded from fiber-reinforced plastic, and in fiber-reinforced plastic, glass fiber or the like is mixed into the resin material, so that the dust collection case 80 is non-transparent. Therefore, in the non-transparent dust collection case 80, the viewing window 80D is an effective means for confirming the filling state of the workpieces in the dust collection case 80. This allows cutting of the workpieces while checking the filling state of the workpieces in the dust collection case 80. As a result, for example, the dust collection case 80 can be removed from the attachment 60 before the workpieces become full, and the workpieces can be discarded. Therefore, damage to the dust collection case 80 can be effectively suppressed. In addition, since the outer shape of the viewing window 80D is smaller than the outer diameter of the punch 72 (the blade portion 72B), it is possible to prevent processed chips from escaping to the outside through the viewing window 80D.

[0073] As described above, the dust collection case 80 is configured as a single member molded from fiber-reinforced plastic. The viewing window 80D is formed penetrating the window area 80E of the dust collection case 80, and the inside and outside of the dust collection case 80 are in communication with each other. This makes it possible to form the viewing window 80D in the dust collection case 80 while suppressing an increase in costs. In addition, since the viewing window 80D connects the inside and outside of the dust collection case 80 with each other, the viewing window 80D can also be used as a hole for dissipating heat.

[0074] Further, a frame-shaped rib 80F is formed on the outer periphery of the dust-collecting case 80, and the rib 80F surrounds the window area 80E (multiple viewing windows 80D). This allows the window area 80E in which the multiple viewing windows 80D are formed to be reinforced by the rib 80F. Furthermore, the rib 80F protrudes outward in the left-right direction beyond the outer periphery of the window area 80E of the dust-collecting case 80. This allows the window area 80E of the dust-collecting case 80 to be protected by the rib 80F.

[0075] Further, the attachment 60 is formed with a mounting groove 62F, and a dust collection bag 100 as a dust collector having a configuration different from that of the dust collection case 80 can be attached to the attachment 60 using the mounting groove 62F. The dust collection bag 100 and the attachment of the dust collection bag 100 to the attachment 60 will be described below with reference to Figs. 10 and 11.

[0076] As shown in these figures, the dust collection bag 100 is made of cloth and is formed in a bag shape that is open to the top. The upper end of the dust collection bag 100 is a bag attachment part 100A, and a pair of left and right clip insertion parts 100B are formed in the bag attachment part 100A. The clip insertion parts 100B are formed in a cylindrical shape that is aligned in the circumferential direction of the bag attachment part 100A. Specifically, a part of the bag attachment part 100A is folded back and sewn to the dust collection bag 100, thereby forming the cylindrical clip insertion part 100B.

[0077] The bag attachment portion 100A is provided with a clip 102. The clip 102 is made of a wire having spring properties, and is bent in a substantially O-shape as viewed from above. Specifically, the clip 102 includes a fulcrum portion 102A constituting the front end of the clip 102, and a pair of left and right arm portions 102B extending rearward from the fulcrum portion 102A. The fulcrum portion 102A is bent in a substantially U-shape opening rearward as viewed from above. The arm portion 102B extends rearward from the rear end of the fulcrum portion 102A and is curved in a substantially arc shape that is convex outward in the left-right direction. The rear ends of the pair of arm portions 102B cross each other and are bent upward. The clip 102 is inserted into the clip insertion portion 100B, and the rear end of the clip 102 protrudes rearward from the clip insertion portion 100B. Arm portion 102B of clip 102 is configured to be elastically deformable in the left-right direction with fulcrum portion 102A as a starting point.

[0078] When the dust collection bag 100 is attached, an operating force is applied to the left and right arm portions 102B of the clip 102, and the arm portions 102B are elastically deformed outward in the left-right direction, so that the bag attachment portion 100A of the dust collection bag 100 is spread outward in the left-right direction. In this state, the case attachment portion 64 of the attachment 60 is inserted into the bag attachment portion 100A and disposed in the upper end portion of the dust collection bag 100. In addition, the arm portion 102B of the clip 102 is disposed in the attachment groove portion 62F of the attachment 60, and the operating force applied to the clip 102 is released, so that the bag attachment portion 100A (clip insertion portion 100B) of the dust collection bag 100 is attached to the attachment groove portion 62F. In the attached state of the dust collection bag 100, the clip insertion portion 100B is pressed against the inner peripheral surface of the attachment groove portion 62F by the biasing force of the pair of arm portions 102B. In this way, the dust collection bag 100 is held by the attachment 60. As described above, by attaching the large-capacity dust collection bag 100 instead of the dust collection case 80, it is possible to cope with an increase in the collection volume of machined chips.

[0079] Further, in the dust collection case 80, the female screw portion 64A is configured so that the mouth of a commercially available plastic bottle 90 can be screwed onto it. Therefore, as shown in Fig. 12, the dust collection case 80 can be removed from the attachment 60, and the mouth of the commercially available plastic bottle 90 can be screwed onto the female screw portion 64A of the attachment 60, thereby attaching the plastic bottle 90 to the die holder 52 instead of the dust collection case 80. This makes it possible to collect chips produced during cutting by utilizing the commercially available plastic bottle 90.

[0080] Further, in the dust collection case 80, the size of the viewing window 80D is set so that the outer shape of the viewing window 80D is smaller than the outer shape of the punch 72 as viewed in the axial direction. This makes it possible to prevent the workpieces collected in the dust collection case 80 from leaking out of the dust collection case 80 through the viewing window 80D.

[0081] Moreover, the viewing windows 80D are formed in a regular hexagonal shape, and are arranged so that the intervals between adjacent viewing windows 80D are constant. This makes it possible to improve the formability of the window area 80E in the dust collection case 80.

[0082] In this embodiment, the viewing window 80D is formed in the dust collection case 80 which is made of a single member which cannot be disassembled, but the viewing window 80D may be formed in another member which is integrally molded with the dust collection case 80. For example, as shown in Fig. 13, a portion of the dust collection case 80 which corresponds to the window area 80E may be formed of a metallic mesh member 82 formed in a mesh pattern, and the mesh member 82 may be formed integrally with the dust collection case 80 by insert molding or the like. In this case, a through hole formed in the mesh member 82 corresponds to the viewing window 80D of the present invention.

[0083] In the present embodiment, the die holder 52 includes a die holder main body 54 and an attachment 60, and the attachment 60 is detachably attached to the die holder main body 54. Alternatively, the attachment 60 and the die holder main body 54 may be integrally formed to form the die holder 52 as a single member.

[0084] In addition, in this embodiment, the female thread portion 64A is formed on the attachment 60 and the male thread portion 80A is formed on the dust collection case 80, but the female thread portion 64A may be formed on the dust collection case 80 and the male thread portion 80A may be formed on the attachment 60. [Explanation of symbols]

[0085] 1 Nibbler 11 Motor housing 12 Gear case 40 Transmission Mechanism 52 Die holder 54 Die holder body 60 Attachment (holding member) 62A Rotation control wall (rotation control part) 62B Front mounting hook (claw and front claw) 62C Rear mounting hook (claw and rear claw) 62D First stopper part (movement restriction part) 62E Second stopper part (movement restriction part) 62F Mounting groove (second mounting part) 64 Case mounting part (first mounting part) 70 Die 72 Punch 80 Dust collection case 80A male thread 80C Dust collection section 80D Viewing window 80F Rib 82 Mesh material 90 PET bottles (drink bottles) 100 Dust collection bag (dust collection device) AL axis

Claims

1. a motor housing that accommodates a motor; A gear case disposed on a front side of the motor housing; a die holder that is formed in a cylindrical shape with an axial direction being in the vertical direction, extends downward from the gear case, has a punch inserted therein so as to be movable in the vertical direction, and holds a die; a transmission mechanism that is housed in the gear case and transmits a driving force of the motor to the punch; a dust collection case connected to a lower end of the die holder, formed in a cylindrical shape with the vertical direction as an axial direction, and having a dust collection section that collects therein workpieces generated during cutting processing by the punch and the die; Equipped with The dust collection case is configured such that its axial direction is aligned with the extension direction of the die holder even when the dust collection case is horizontal, A nibbler, wherein the outer diameter of the dust collection case is less than or equal to twice the outer diameter of the die holder.

2. 2. The nibbler according to claim 1, wherein the dust collecting portion is located forward of the rear end of the gear case.

3. a male screw portion for connecting the die holder and the dust collection case is formed on one of the die holder and the dust collection case, The other of the die holder and the dust collection case has a female screw portion formed thereon to be screwed into the male screw portion, 2. The nibbler according to claim 1, wherein the dust collecting portion is located inside the female screw portion when viewed from above and below.

4. The die holder includes: A die holder body extending in the vertical direction; A holding member detachably attached to a lower end portion of the die holder body; It is composed of 2. The nibbler according to claim 1, wherein the dust collection case is held by the holding member.

5. 5. The nibbler according to claim 4, wherein the holding member is removably attached to the die holder body without using tools.

6. The holding member has a claw portion, The nibbler according to claim 4 , wherein the claw portion is engaged with the die holder body to restrict downward movement of the holding member.

7. The holding member has a movement restricting portion, The nibbler according to claim 6 , wherein the movement restricting portion abuts against the die holder body, thereby restricting the upward movement of the holding member.

8. The holding member has a rotation restricting portion, The nibbler according to claim 6 , wherein the rotation regulating portion abuts against the die holder body, thereby regulating relative rotation of the holding member with respect to the die holder body about an axis extending in the vertical direction.

9. The claw portion is A front claw portion located forward with respect to an axis of the holding member; A rear claw portion located rearward with respect to the axis; It is composed of 7. The nibbler according to claim 6, wherein the rear claw portion is positioned at a position offset from the axis in the left-right direction.

10. 2. The nibbler according to claim 1, wherein the dust-collection case has a viewing window through which the inside of the dust-collection case can be viewed.

11. The dust collection case is made of a single member, The nibbler according to claim 10 , wherein the viewing window provides communication between the inside and the outside of the dust collection case.

12. The nibbler according to claim 11, wherein the viewing window is constituted by a plurality of through holes formed in the dust-collecting case, or a metallic mesh member integrally formed with the dust-collecting case.

13. The nibbler according to claim 10 , wherein a rib is formed on an outer periphery of the dust-collection case so as to surround the viewing window.

14. The holding member is A first attachment portion for attaching the dust collection case; A second attachment portion configured to be able to attach a dust collector having a shape different from that of the dust collection case; 5. The nibbler of claim 4, comprising:

15. The dust collection case is formed with a male screw portion for connecting the die holder and the dust collection case, The die holder has a female screw portion that is screwed into the male screw portion, 2. The nibbler according to claim 1, wherein the female screw portion is configured so that a commercially available beverage bottle with its cap removed can be attached in place of the dust collection case.

Images