Electric punching shear

Abstract

The invention provides an electric punching shear with a chip collecting accessory, which can improve convenience. This electric punching shear is provided with: a long punch extending in the axial direction and capable of reciprocating in the axial direction; a die having a first through-hole into which the tip of the punch can be inserted; a die holder having a recessed portion for accommodating the die, a tip portion located further away from the punch than the recessed portion in the axial direction thereof, and a second through-hole communicating with the first through-hole; and a chip collection attachment that is detachably attached to the tip of the die holder. The chip collection attachment is provided with: a cylindrical attachment part configured so as to be attached to the tip of the die holder; and a closed-end cylindrical accommodating part for accommodating chips guided through the first through hole, the second through hole and the interior of the mounting part. The outer diameter of the mounting portion and the outer diameter of the receiving portion are substantially the same as the outer diameter of the tip portion of the die holder.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric punch shear. BACKGROUND

[0002] As one of electric power tools, an electric punch shear is known. The electric punch shear is provided with a punch in a long shape, and a die held by a die holder and having a through-hole into which a tip of the punch is inserted. A cut piece in a plate shape is inserted between the die and the punch, and the punch is made to perform a reciprocating motion, whereby the cut piece is cut between an edge of the die and an edge of the punch. By repeatedly cutting while gradually misaligning the cutting position, a desired range of the cut piece can be cut. A through-hole (hereinafter also referred to as a machining start hole) is formed in the cut piece using a hole saw, the die holder is inserted into the machining start hole until the cut piece is positioned between the die and the punch, whereby cutting can be performed in a manner of excavating a part of the cut piece.

[0003] According to such an electric punch shear, a cutting chip generated by cutting is discharged from a tip of the die (an end portion on the side opposite to the die) via the through-holes of the die and the die holder. Japanese Patent Application Publication No. 2005-21980 discloses a technique for collecting such a cutting chip in a container. Specifically, the container is attached to the tip of the die holder (the end portion on the side opposite to the die) by means of a fitting member. The cutting chip is guided into the container via the through-holes of the die and the die holder. According to this electric punch shear, since the cutting chip does not fly around, time for cleaning is saved, and thus the convenience of the user is improved. SUMMARY

[0004] However, the electric punch shear of Japanese Patent Application Publication No. 2005-21980 has room for improvement in terms of convenience. For example, in the above-described electric punch shear, the outer diameter of the fitting member and the container (particularly the outer diameter of the container) is much larger than the outer diameter of the die holder. Thus, in the case of cutting in a manner of excavating a part of the cut piece, a large machining start hole through which the fitting member and the container can pass needs to be formed. In order to form such a large machining start hole, a hole saw of a large diameter needs to be prepared. In addition, a large hole saw is not good in terms of operability. In light of this, it is desirable to improve the convenience of the electric punch shear provided with a cutting chip collecting attachment.

[0005] This specification discloses an electric punch shear. The electric punch shear may include: a punch, which is an elongated punch extending along an axial direction and capable of reciprocating along the axial direction; a die, having a first through hole into which the end of the punch can be inserted; a die holder, having a recess for receiving the die, an end portion located in the axial direction further away from the punch than the recess, and a second through hole communicating with the first through hole; and a chip collection accessory, which is detachably mounted to the end portion of the die holder. The chip collection accessory may include: a cylindrical mounting portion configured to be mounted to the end portion of the die holder; and a bottomed cylindrical receiving portion for receiving chips guided through the first through hole, the second through hole, and the interior of the mounting portion. The outer diameters of the mounting portion and the receiving portion may be approximately the same as the outer diameter of the end portion of the die holder.

[0006] In this specification, the term "outer diameter" refers not only to the outer diameter of a component with a circular cross-section, but also when referring to the thickness of a component with a non-circular cross-section. In this case, the term "outer diameter" refers to the length of the longest straight line connecting any two points on the outer contour of the non-circular cross-section.

[0007] According to this electric punch shear, the outer diameters of the mounting section and the receiving section are approximately the same as the outer diameter of the end portion of the die holder. Therefore, when cutting by removing a portion of the workpiece, compared to conventional electric punch shears, the required machining start hole for the die holder and receiving section to pass through can be reduced. Consequently, user convenience is improved because a smaller diameter hole saw can be used to form the machining start hole.

[0008] This specification also discloses an electric punch shear. The electric punch shear may include: a punch, which is an elongated punch extending along an axial direction and capable of reciprocating along the axial direction; a die, having a first through hole into which the end of the punch can be inserted; a die holder, having a recess for receiving the die, an end portion located on the side further away from the punch in the axial direction than the recess, a second through hole communicating with the first through hole, and a first mounting hole extending along the axial direction; and a chip collection accessory, which is detachably mounted to the end portion of the die holder. The die may have a second mounting hole coaxial with the first mounting hole, and is configured to be mounted to the die holder by bolts inserted from the end portion of the die holder into the first mounting hole and the second mounting hole. The chip collecting accessory may include: a cylindrical outer periphery configured to be mounted on the end portion of a die holder; and a bottomed cylindrical receiving portion communicating with the interior of the mounting portion and for collecting chips guided through the first through hole, the second through hole, and the mounting portion. The mounting portion may include: a cylindrical outer periphery; and a bottom having a third through hole communicating with the second through hole, and a third mounting hole coaxial with the first and second mounting holes. The mounting portion can be mounted on the end portion of the die holder by bolts inserted from the interior of the mounting portion into the third mounting hole, the first mounting hole, and the second mounting hole.

[0009] According to this electric punch shear, a chip collection attachment can be installed using the first mounting hole of the die holder, the second mounting hole of the die, and bolts. These components are inherent to the electric punch shear for mounting the die to the die holder. Therefore, the configuration for installing the chip collection attachment on the electric punch shear can be simplified. In addition, the user can easily install the chip collection attachment through a simple operation (based on bolt tightening), thereby improving user convenience. Attached Figure Description

[0010] Figure 1 This is a perspective view of an electric punch shear according to one embodiment, wherein a chip collection attachment is installed in the die holder of the electric punch shear.

[0011] Figure 2 This is a 3D view of an electric punch shear; the chip collection attachment has been removed.

[0012] Figure 3 This is a 3D view of an electric punch shear; the chip collection attachment has been removed.

[0013] Figure 4 This is a longitudinal sectional view of an electric punching shear.

[0014] Figure 5 This is a magnified three-dimensional view showing a portion of the electric punch shear around the die holder.

[0015] Figure 6 This is a 3D view of the chip collection attachment.

[0016] Figure 7 This is an exploded 3D view of the chip collection attachment.

[0017] Figure 8 It is a 3D view of the installation section.

[0018] Figure 9 This is a magnified left view showing a portion of the electric punch shears surrounding the die holder.

[0019] Figure 10 It is along Figure 9 A partial sectional view of line A-A in the middle.

[0020] Figure 11 This is a partial sectional view of the chip collection attachment during non-assembly. Figure 10 Correspondingly.

[0021] Explanation of reference numerals in the attached figures

[0022] 10…Electric punch shear; 15…Electric punch shear body; 16…Battery; 20…Housing; 21…Electric motor; 22…Motor shaft; 23…Spur gear; 24…Crankshaft; 25…Needle roller bearing; 26…Rod; 27…Slider; 28…Punch retainer; 29…Locking nut; 30…Punch; 40…Die retainer; 41…Second through hole; 42…Recess; 43…End part; 44…First mounting hole; 50…Die; 51…First through hole; 52…Second mounting hole; 60…Bolt; 100…Shavings collection accessory; 110…Mounting part; 111…Outer periphery; 112…Bottom; 112a…Metal part; 112b…Resin part; 113…Third mounting hole; 114…Third through hole; 115…Notch; 116…Inner surface; 117…Rib; 120…Receiving part; 130…Receiving part body; 140…Cover part; 141…Cylinder part; 142…Flange; 143…Handle part; 144…Rib. Detailed Implementation

[0023] Hereinafter, with reference to the accompanying drawings, representative but not limiting examples of the present invention are described in detail. This detailed description is merely intended to show those skilled in the art the details for carrying out preferred embodiments of the invention, and is not intended to limit the scope of the invention. Furthermore, the additional features and inventions disclosed below are intended to provide further improved apparatus, methods of manufacturing, and methods of use, and may be used separately or in conjunction with other features or inventions.

[0024] Furthermore, the combinations of features or processes disclosed in the following detailed description are not, in the broadest sense, necessary for carrying out the invention, and are described only to illustrate representative specific examples of the invention. Moreover, the features of the representative specific examples above and below, and the features recited in the independent and dependent claims, are not necessarily to be combined as described below, i.e., combined as in the specific examples described herein, or combined in the order listed, when providing additional and useful embodiments of the invention.

[0025] All features recorded in this specification and / or the claims are intended to be disclosed individually and independently, as a limitation relating to the initial disclosure and the specific matters recorded in the claims, in addition to the configuration of the features recorded in the embodiments and / or the claims. Furthermore, all descriptions relating to numerical ranges and groups or categories are intended to disclose intermediate configurations as a limitation relating to the initial disclosure and the specific matters recorded in the claims.

[0026] In one or more embodiments, when the outer diameter of the mounting portion is defined as D1 (mm), the outer diameter of the receiving portion as D2 (mm), and the outer diameter of the end portion of the die retainer as D3 (mm), the conditions D1 ≤ D3 + 6mm and D2 ≤ D3 + 6mm can be met. With this configuration, the machining start hole can be reduced, thereby improving user convenience.

[0027] In one or more embodiments, when the outer diameter of the mounting portion is defined as D1 (mm), the outer diameter of the receiving portion is defined as D2 (mm), and the outer diameter of the end portion of the die retainer is defined as D3 (mm), the conditions D1 ≤ D2 + 3mm and D2 ≤ D3 + 3mm can be met. With this configuration, the machining start hole can be further reduced.

[0028] In one or more embodiments, the outer diameter of the mounting portion and the outer diameter of the receiving portion may be less than the outer diameter of the end portion of the die holder. With this configuration, the machining start hole can be further reduced. In other words, cutting can be performed by excavating a portion of the workpiece using a machining start hole of the same size as when no chip collection attachment is installed.

[0029] In one or more embodiments, the die holder may also have a first mounting hole extending along the axial direction. The die may also have a second mounting hole coaxial with the first mounting hole, and be configured to be mounted to the die holder by bolts inserted from the end of the die holder into the first mounting hole and the second mounting hole. The mounting portion may also have a cylindrical outer periphery and a bottom having a third through hole communicating with the second through hole and a third mounting hole coaxial with the first and second mounting holes. The mounting portion may also be mounted to the end of the die holder by bolts inserted from the inside of the mounting portion into the third mounting hole, the first mounting hole, and the second mounting hole. According to this configuration, a chip collection accessory can be mounted using the first mounting hole of the die holder, the second mounting hole of the die, and the bolts. These configurations are inherent in electric punch shears for mounting the die to the die holder. Therefore, the configuration for mounting a chip collection accessory to an electric punch shear can be simplified. Furthermore, users can easily install the chip collection attachment through a simple operation (based on bolt-fastening), thus improving user convenience. In addition, due to the high degree of sealing between the die retainer and the mounting section, chips will not overflow from these gaps.

[0030] In one or more embodiments, the outer periphery of the mounting portion may also have a notch, which is adjacent to the bottom and the bolt and penetrates the outer periphery radially. The head of the bolt may also be partially located within the notch. According to this configuration, the mounting portion can be arranged such that the bolt head is partially located radially outward from the inner surface of the mounting portion compared to the inner surface of the outer periphery. In other words, it is not necessary to increase the outer diameter of the outer periphery to prevent interference between the bolt head and the inner surface of the outer periphery. Therefore, compared to the case where the outer periphery does not have a notch, the outer diameter of the mounting portion can be reduced, resulting in a reduction in the size of the machining start hole.

[0031] In one or more embodiments, the mounting portion and the receiving portion may also be separate components. The receiving portion may also be installed in the mounting portion by fitting it into the mounting portion. It may also be configured such that, with the receiving portion installed in the mounting portion, the receiving portion partially seals the notch. According to this configuration, the user can replace the receiving portion depending on the situation (e.g., the desired chip collection capacity). Furthermore, when using the electric punch shear with the chip collection attachment positioned higher in the vertical direction than the die holder, it is possible to suppress the overflow of chips from the notch to the outside.

[0032] In one or more embodiments, the receiving portion may also be flexible. According to this configuration, even when the portion from the receiving portion to the end of the die holder is inserted into a narrow space (e.g., a narrow passage), the receiving portion can flex along the shape of the insertion space. Therefore, the problem of limited application area of ​​the electric punch shear can be suppressed, while ensuring a larger chip-receiving capacity of the receiving portion.

[0033] In one or more embodiments, the receiving section may also be in the form of a resin hose. With this configuration, chips collected within the receiving section are less likely to get stuck on the inner surface of the receiving section. Therefore, chips can be smoothly discharged when discarding them. Furthermore, resin hoses are relatively inexpensive, thereby reducing the cost of the chip collection accessory. Additionally, the user can adjust the receiving section to a desired length and capacity by cutting the resin hose at the desired location.

[0034] In one or more embodiments, the receiving section may also be transparent to the extent that the storage condition of the chips inside can be visually confirmed. According to this configuration, the user can visually confirm the amount of chips stored in the receiving section. Therefore, the timing for discharging the chips stored in the receiving section can be appropriately determined. In other words, the user can easily determine how much work can continue to be performed without discharging the chips stored in the receiving section.

[0035] In one or more embodiments, the mounting portion and the receiving portion may also be separate components. The receiving portion may also be mounted to the mounting portion by fitting into it. The receiving portion may also include: a bottomless cylindrical receiving portion body; and a cover member that seals the opening by fitting into the opening of the receiving portion body. It may also be configured such that the force required to release the engagement between the receiving portion and the cover member is less than the force required to release the engagement between the receiving portion and the mounting portion. According to this configuration, when discharging chips stored in the receiving portion, the cover member can be easily removed without releasing the engagement between the receiving portion and the mounting portion. Therefore, chip discharge operations are easy to perform.

[0036] Hereinafter, with reference to the accompanying drawings, a representative and non-limiting embodiment of the electric punching shear 10 of the present invention will be further described in detail. Figure 1 As shown, the electric shear 10 includes: an electric shear body 15 and a chip collection attachment 100 (hereinafter simply referred to as attachment 100). The following is a brief description of the electric shear body 15. The electric shear body 15 is known, therefore only a brief description will be given. Figure 2 as well as Figure 3As shown, the main body 15 of the electric punch shear includes: a housing 20, a battery 16, a punch 30, a die holder 40, a die 50, and two bolts 60.

[0037] The outer casing 20 has a cylindrical shape extending in an elongated form. A battery 16, serving as the power source for the electric punch shear body 15, is fitted to one end of the outer casing 20 along its length. An elongated die holder 40 extends from the other side of the outer casing 20 along its length. The die holder 40 extends in a direction orthogonal to the length of the outer casing 20. In the following description, for ease of explanation, the length of the outer casing 20 is defined as the front-rear direction of the electric punch shear 10. In the front-rear direction, the side where the die holder 40 is located is defined as the front side of the electric punch shear 10, and the side where the battery 16 is located is defined as the rear side of the electric punch shear 10. Furthermore, the length of the die holder 40 is defined as the vertical direction of the electric punch shear 10. In the vertical direction, the side where the outer casing 20 is located is defined as the upper side of the electric punch shear 10, and the opposite side is defined as the lower side of the electric punch shear 10. Additionally, the direction orthogonal to both the front-rear and vertical directions is defined as the left-right direction of the electric punch shear 10. In the left-right direction, the right side when viewed from the rear is defined as the right side of the electric punching shear 10, and the opposite side is defined as the left side of the electric punching shear 10.

[0038] like Figure 4 As shown, various components of the electric punch shear body 15 are housed inside the housing 20. An electric motor 21 is housed approximately at the center of the housing 20. The electric motor 21 is powered by electricity supplied from the battery 16. The electric motor 21 includes a motor shaft 22 extending in the longitudinal direction. The rotational power of the electric motor 21 is transmitted to a crankshaft 24 via the motor shaft 22 and a spur gear 23. A rod 26 extending in the vertical direction passes through the crankshaft 24 and is connected to the rod 26 by means of a needle roller bearing 25. The portion of the crankshaft 24 connected to the rod 26 is eccentric relative to the axis of rotation of the crankshaft 24. Thus, the rotational motion of the crankshaft 24 is converted into the reciprocating motion of the rod 26 in the vertical direction.

[0039] like Figure 4 As shown, the die retainer 40 has a generally cylindrical shape extending in the vertical direction. The die retainer 40 is fixed to the front and lower cylindrical portion of the housing 20 by a locking nut 29. A slider 27, a punch retainer 28, and a punch 30 are housed inside the die retainer 40. A rod 26 is connected to the punch retainer 28 via the slider 27. The elongated punch 30 is held in the punch retainer 28. The punch 30 extends in the vertical direction (its own axial direction). Along with the vertical reciprocating motion of the rod 26, the punch 30 can also reciprocate in the vertical direction.

[0040] likeFigure 4 as well as Figure 9 As shown, a recess 42 is provided near the lower end of the die holder 40. The recess 42 is formed by cutting out the front and side portions (right and left portions) of the die holder 40. In the die holder 40, the portion that is further downward than the recess 42 (in other words, the portion that is further away from the punch 30 than the recess 42) is referred to as the end portion 43. The end portion 43 has a second through hole 41 extending in the vertical direction.

[0041] like Figure 4 As shown, the die 50 is housed within the recess 42. The die 50 is secured by two bolts 60 (see reference). Figure 2 as well as Figure 3 The punch 30 is fixed to the die holder 40 (described in detail later). The die 50 has a first through hole 51 extending in the vertical direction. The first through hole 51 communicates with the second through hole 41 of the die holder 40. The end (lower end) of the punch 30 protrudes from the recess 42 and can be inserted into the first through hole 51. When the punch 30 is at the top dead center, a gap is formed between the end of the punch 30 and the upper edge of the die 50 (not shown). When the punch 30 is at the bottom dead center, the end of the punch 30 is inserted into the first through hole 51 of the die 50.

[0042] When performing a cutting operation using the electric punch shear body 15, with the punch 30 at its top dead center, the plate-shaped workpiece is inserted into the gap between the end of the punch 30 and the die 50. When cutting from the end of the workpiece, simply insert the end of the workpiece between the end of the punch 30 and the die 50. When cutting to remove a portion of the workpiece, the user first uses a hole saw to create a machining start hole. After inserting the end portion 43 of the die holder 40 into the machining start hole, the user inserts the cutting portion between the end of the punch 30 and the die 50. When the electric motor 21 is driven in this state, the punch 30 moves from the top dead center to the bottom dead center. At this time, the workpiece is sheared between the edge of the end of the punch 30 and the edge of the die 50 (the portion defined for the upper edge of the first through hole 51). With the punch 30 repeatedly reciprocating, the user can gradually change the cutting position to cut (or remove) the desired area of ​​the workpiece. The chips generated during such cutting operations are discharged to the outside through the first through hole 51 of the die 50 and the second through hole 41 of the end portion 43 of the die holder 40.

[0043] The following describes the structure for mounting the die 50 to the die holder 40. For example... Figure 11As shown, the die retainer 40 has two first mounting holes 44 extending in the vertical direction. The first mounting holes 44 penetrate the end portion 43 of the die retainer 40. The two first mounting holes 44 are arranged symmetrically from left to right. In this embodiment, the inner surface of the first mounting holes 44 has internal threads. However, this inner surface may not have internal threads. The die 50 has two second mounting holes 52 extending in the vertical direction. The second mounting holes 52 penetrate the die 50. The two second mounting holes 52 are coaxial with the two first mounting holes 44. The inner surface of the second mounting holes 52 has internal threads.

[0044] When installing the die 50 onto the die holder 40, as Figure 11 As shown, two bolts 60 are inserted from the end portion 43 (in other words, from the bottom) of the die holder 40 into the two first mounting holes 44 and the two second mounting holes 52, and the bolts 60 are tightened. Accordingly, the end portion 43 is clamped between the die 50, which is screwed onto the bolts 60, and the head of the bolts 60, thereby fixing the die 50 to the die holder 40. This mounting structure is the same as that of conventional electric punch shears. When replacing the die holder 40, it can be removed simply by removing the two bolts 60.

[0045] To prevent chips generated during cutting operations based on the electric shear body 15 from scattering outwards and to collect them instead, a chip collection accessory 100 can be detachably installed on the electric shear body 15. For example... Figure 1 As shown, accessory 100 is installed at the end 43 of die retainer 40. Specifically, as... Figure 1 , 6 As shown in Figure 7, Attachment 100 includes: a mounting section 110 and a housing section 120.

[0046] like Figure 6 as well as Figure 7 As shown, the mounting portion 110 has a generally cylindrical shape. Specifically, the mounting portion 110 includes a cylindrical outer peripheral portion 111 and a bottom 112 that partially seals the opening on the upper side of the outer peripheral portion 111. In this embodiment, the outer peripheral portion 111 has a cylindrical shape. Furthermore, the outer diameter of the outer peripheral portion 111 is approximately equal to the outer diameter of the end portion 43 of the die holder 40. In this embodiment, the outer diameter of the outer peripheral portion 111 is the same as the outer diameter of the end portion 43. The bottom 112 has the same outer diameter as the outer peripheral portion 111. Figure 8 As shown, the inner surface 116 of the outer peripheral portion 111 has a plurality of ribs 117. The ribs 117 protrude from the inner surface 116 toward the radially inward side and extend elongated in the vertical direction.

[0047] In this embodiment, the outer peripheral portion 111 is a resin component. Furthermore, the bottom portion 112 includes a metal portion 112a and a resin portion 112b. The outer peripheral portion 111 and the bottom portion 112 are integrally formed by injection molding. That is, the outer peripheral portion 111 and the resin portion 112b are integrally formed from the same resin material. The metal portion 112a has two third mounting holes 113 and a third through hole 114. The third mounting holes 113 and the third through hole 114 extend through the metal portion 112a in the vertical direction, respectively. The two third mounting holes 113 are coaxial with the first mounting hole 44 of the die retainer 40 and the second mounting hole 52 of the die 50. The third through hole 114 communicates with the second through hole 41 of the die retainer 40.

[0048] In this embodiment, the thickness of the bottom 112 is 1 mm. This thickness is achieved by shaping the bottom 112 within the mounting structure of the existing electric punching die 50 (see reference). Figure 11 The thickness of the bolt 60 used in the process, which allows it to engage with the internal thread of the die 50, enables the use of conventional bolts 60 in the installation of the mounting part 110. However, it is also possible to prepare a longer, dedicated bolt for installing the mounting part 110.

[0049] like Figure 6 as well as Figure 7 As shown, the outer peripheral portion 111 has two notches 115. The two notches 115 are adjacent to the bottom 112 and penetrate the outer peripheral portion 111 radially. The circumferential positions of the two notches 115 correspond to the circumferential positions of the two third mounting holes 113, respectively.

[0050] Such a mounting part 110 is mounted on the end part 43 of the die retainer 40 as described below. For example... Figure 10 As shown, the user first configures the mounting portion 110 such that the lower edge of the end portion 43 abuts against the bottom portion 112. Next, the user inserts a bolt 60 from inside the mounting portion 110 (from below) into the third mounting hole 113 of the mounting portion 110, the first mounting hole 44 of the die retainer 40, and the second mounting hole 52 of the die 50, and tightens the bolt 60. Accordingly, the mounting portion 110 is fastened together with the die retainer 40 and the die 50 by the bolt 60, and is thus fixed to the die retainer 40. With this configuration, it is possible to utilize... Figure 11The mounting structure of the die 50 shown allows the mounting portion 110 to be easily mounted onto the die holder 40. Furthermore, the mounting structure of the mounting portion 110 can be simplified. The portion of the bottom 112 of the mounting portion 110 that is pressed by the head of the bolt 60 is a metal portion 112a, thus easily ensuring the strength to withstand the pressing force. However, the entire mounting portion 110, including the bottom 112, can also be made of resin. Alternatively, the entire mounting portion 110 can also be made of metal. In this case, the entire mounting portion 110 can also be formed by deep drawing.

[0051] like Figure 1 as well as Figure 10 As shown, notch 115 is adjacent to bolt 60, and the head of bolt 60 is partially located within notch 115. In other words, as Figure 10 As shown, the head of the bolt 60 is located radially outward from the inner surface 116 of the outer peripheral portion 111. Because the outer peripheral portion 111 has a notch 115 that does not interfere with the inner surface 116, the bolt 60 can be inserted and tightened. With this configuration, interference between the head of the bolt 60 and the inner surface 116 of the outer peripheral portion 111 can be avoided without increasing the outer diameter of the outer peripheral portion 111.

[0052] like Figure 1 as well as Figure 7 As shown, the receiving portion 120 is a bottomed cylindrical component for receiving chips and is separate from the mounting portion 110. In this embodiment, the receiving portion 120 includes a receiving portion body 130 and a cover member 140. The receiving portion body 130 has a bottomless cylindrical shape extending in the vertical direction. In this embodiment, the receiving portion body 130 is in the form of a flexible resin hose. The outer diameter of the receiving portion body 130 is slightly smaller than the inner diameter of the mounting portion 110 (inner surface 116). In addition, the inner diameter of the portion of the mounting portion 110 with ribs 117 is slightly larger than the outer diameter of the receiving portion body 130. Therefore, one end (upper end) of the receiving portion body 130 can be fitted (pressed into) the mounting portion 110 by utilizing the elasticity of the resin hose-shaped receiving portion body 130. According to this configuration, the receiving portion body 130 can be detachably mounted to the mounting portion 110.

[0053] like Figure 7As shown, the cover member 140 includes a cylindrical portion 141, a flange 142, and a lifting knob 143. The cylindrical portion 141 has a cylindrical shape extending in the vertical direction. The outer peripheral surface of the cylindrical portion 141 has a plurality of ribs 144. The ribs 144 protrude radially outward from the outer peripheral surface of the cylindrical portion 141 and extend elongatedly in the vertical direction. The outer diameter of the portion of the cylindrical portion 141 in which the ribs 144 are formed is slightly larger than the inner diameter of the receiving body 130. As a result, the cylindrical portion 141 can be fitted (pressed into) into the receiving body 130 by utilizing the elasticity of the receiving body 130, which is in the form of a resin hose. According to this configuration, the cover member 140 can be detachably installed on the receiving body 130, thereby sealing the opening on the lower side of the receiving body 130.

[0054] Flange 142 is located below cylindrical portion 141 and defines the bottom of cylindrical portion 141. Flange 142 has an outer diameter larger than that of cylindrical portion 141 (the outer diameter of the portion forming rib 144) and functions as a stop member abutting against the receiving body 130 when cylindrical portion 141 is fitted into the receiving body 130. A lifting knob 143 is located below flange 142 and has a frustoconical shape. The user can easily remove and install the cover component 140 by detaching the lifting knob 143 with their fingers. In this embodiment, the outer diameters of flange 142 and lifting knob 143 are the same as the outer diameter of the receiving body 130.

[0055] When the receiving section 120 is installed on the mounting section 110 and the electric punch shear 10 is used, the chips are guided into the receiving section body 130 through the first through hole 51 of the die 50, the second through hole 41 of the die holder 40, and the third through hole 114 of the mounting section 110, and are stored therein. When the receiving section body 130 is full of chips, the user can remove the cover member 140 to discharge and discard the chips. In this embodiment, the receiving section body 130 is formed of a transparent member to the extent that the chip storage condition inside can be visually confirmed. As a result, the user can visually confirm the amount of chips stored in the receiving section body 130. Therefore, the timing of discharging the chips stored in the receiving section body 130 can be appropriately determined.

[0056] Furthermore, according to Annex 100, the mounting portion 110, the receiving portion 120, and the receiving portion body 130 are configured such that the force required to release the engagement between the receiving portion body 130 and the cover member 140 is less than the force required to release the engagement between the receiving portion body 130 and the mounting portion 110. Therefore, when discharging chips stored in the receiving portion body 130, the cover member 140 can be easily disassembled without releasing the engagement between the receiving portion body 130 and the mounting portion 110. This facilitates chip removal operations. The engagement force between the receiving portion body 130 and the cover member 140, and the engagement force between the receiving portion body 130 and the mounting portion 110, can be adjusted by giving a difference in at least one of the height and length of the rib 117 of the mounting portion 110 and the rib 144 of the cover member 140. In an alternative embodiment, the mounting portion 110 may not have rib 117, and the cylindrical portion 141 may not have rib 144. In this case, the difference between the outer diameter of the cylindrical portion 141 and the inner diameter of the receiving portion body 130 may be greater than the difference between the outer diameter of the receiving portion body 130 and the inner diameter of the mounting portion 110. Even with this configuration, the same effect can be achieved.

[0057] According to the electric punch shear 10 described above, the outer diameters of the mounting portion 110 and the receiving portion 120 of the attachment 100 are the same as the outer diameter of the end portion 43 of the die holder 40. Therefore, when cutting by removing a portion of the workpiece, compared to conventional electric punch shears, the required machining start hole for the die holder 40 and the receiving portion 120 to pass through can be reduced. In other words, the attachment 100 and the end portion 43 of the die holder 40 can be inserted into a machining start hole of the same size as when the attachment 100 is not used for cutting. Therefore, compared to conventional electric punch shears where the outer diameter of the chip collection attachment is much larger than the end portion 43, a smaller diameter hole saw can be used to form the machining start hole. As a result, user convenience is improved.

[0058] In other words, in this embodiment, the outer diameters of the mounting portion 110 and the receiving portion 120 are smaller than the diameter of the machining start hole. The diameter of the machining start hole without using the accessory 100 is typically 21 mm. Therefore, even when using the accessory 100, the user can use a conventional 21 mm hole saw to form the machining start hole and insert the accessory 100 and the end portion 43 of the die holder 40 into the machining start hole.

[0059] In an alternative embodiment, the mounting portion 110 may not have a notch 115. In this case, the outer diameter of the mounting portion 110 can be increased to the size that prevents interference between the bolt 60 and the inner surface 116 of the outer peripheral portion 111. In this case, the thickness of the outer peripheral portion 111 can be set such that D1≤D2+3mm and D2≤D3+3mm when the outer diameter is defined as D1 (mm), the outer diameter of the receiving portion 120 is defined as D2 (mm), and the outer diameter of the end portion 43 of the die holder 40 is defined as D3 (mm). Furthermore, in an alternative embodiment, D1≤D3+6mm and D2≤D3+6mm can also be satisfied. Even in the above-described alternative embodiment, the machining start hole can be reduced compared to conventional electric punch shears.

[0060] Furthermore, according to the electric punch shear 10, the mounting part 110 and the receiving part 120 are separate components. Therefore, the user can replace them with the receiving part body 130 of the desired length (capacity) depending on the situation. However, the mounting part 110 and the receiving part 120 can also be a single, non-removable piece. In this case, a bolt 60 can be inserted from the lower end of the receiving part body 130, and a longer tool can be used for fastening.

[0061] In addition, according to the electric punch shear 10, such as Figure 10 As shown, with the receiving part 120 installed on the mounting part 110, the upper end of the receiving part body 130 partially seals the notch 115. According to this configuration, when the electric punch 10 is used in a position where its lower side is above the vertical direction (in other words, the attachment 100 is positioned above the vertical direction more than the die holder 40), it is possible to suppress the overflow of chips from the notch 115 to the outside.

[0062] Furthermore, according to the electric punch shear 10, since the receiving part body 130 is flexible, even when the accessory 100 and the end portion 43 of the die holder 40 are inserted into a narrow space (such as a narrow passage), the receiving part body 130 can bend along the shape of the insertion space. Therefore, the problem of limited usage area of ​​the electric punch shear 10 can be suppressed, while ensuring a larger chip receiving capacity of the receiving part 120.

[0063] Furthermore, according to the electric punch shear 10, the receiving body 130 is in the form of a resin hose. Therefore, chips contained within the receiving body 130 are less likely to stick to the inner surface of the receiving body 130. Thus, when discarding chips contained within the receiving body 130, they can be smoothly discharged. In addition, resin hoses are relatively inexpensive, thereby reducing the cost of accessory 100. Furthermore, by cutting the resin hose at the desired location, the user can adjust the chip-containing capacity of the receiving body 130 to the desired amount. Alternatively, the receiving body 130 can be adjusted to a size corresponding to the width of the insertion location of the receiving body 130.

[0064] While the embodiments have been described above, they are merely for the purpose of facilitating understanding of the present invention and are not intended to limit the invention. The present invention can be modified and improved without departing from its spirit, and it includes equivalent features. Furthermore, within the scope of at least solving a portion of the aforementioned problems, or at least achieving a portion of the effects, the constituent elements described in the claims and specification can be arbitrarily combined or omitted.

[0065] For example, the shape and form of the constituent components of the electric punch shear 10 described above are merely illustrative. As long as the function of the constituent components can be ensured, any changes can be made. For example, the shape of the mounting part 110 and / or the housing body 130 is not limited to a cylindrical shape, but can be any cylindrical shape.

[0066] Alternatively, a bottomed cylindrical component with one end closed along its length can be used instead of the receiving section 120. In this case, the chips stored inside the cylindrical component can be discharged by pulling the cylindrical component out of the mounting section 110.

[0067] Alternatively, the receiving body 130 can be a cylindrical component of any shape. For example, the receiving body 130 can also be in the form of a flexible corrugated tube. In this case, the user can extend or retract the receiving body 130 according to the desired chip holding capacity or the width of the insertion site of the receiving body 130. Alternatively, the receiving body 130 can also be in the form of a rigid plastic tube.

[0068] The correspondence between the constituent elements of the above embodiments and the constituent elements of the claims is shown below. However, each constituent element of the embodiments is merely an example and is not intended to limit the constituent elements of the present invention. The electric punch shear 10 is an example of an "electric punch shear". The punch 30 is an example of a "punch". The die holder 40 is an example of a "die holder". The second through hole 41 is an example of a "second through hole". The recess 42 is an example of a "recess". The end portion 43 is an example of an "end portion". The first mounting hole 44 is an example of a "first mounting hole". The die 50 is an example of a "die". The first through hole 51 is an example of a "first through hole". The second mounting hole 52 is an example of a "second mounting hole". The bolt 60 is an example of a "bolt". The chip collecting accessory 100 is an example of a "chip collecting accessory". The mounting part 110 is an example of a "mounting part". The outer periphery 111 is an example of an "outer periphery". The bottom 112 is an example of a "bottom". The third mounting hole 113 is an example of a "third mounting hole". The third through hole 114 is an example of a "third through hole". The notch 115 is an example of a "notch". The receiving part 120 is an example of a "receiving part". The receiving part body 130 is an example of a "receiving part body". The cover component 140 is an example of a "cover component".

Claims

1. An electric punching shear, characterized in that, The electric punching shear has the following features: A punch is a long strip-shaped punch that extends along an axial direction and is capable of reciprocating along the axial direction. A die having a first through hole into which the end of the punch can be inserted; A die retainer having a recess for receiving the die, an end portion located further away from the punch in the axial direction than the recess, and a second through hole communicating with the first through hole; and A chip collection attachment is detachably mounted to the end portion of the die holder. The chip collecting accessory includes: a cylindrical mounting portion configured to be mounted on the end portion of the die holder; and a bottomed cylindrical receiving portion for collecting the chips guided through the first through hole, the second through hole, and the interior of the mounting portion. The outer diameter of the mounting portion and the outer diameter of the receiving portion are approximately the same as the outer diameter of the end portion of the die holder.

2. The electric punching shear according to claim 1, characterized in that, When the outer diameter of the mounting part is defined as D1mm, the outer diameter of the receiving part is defined as D2mm, and the outer diameter of the end part of the die holder is defined as D3mm, D1≤D3+6mm and D2≤D3+6mm are satisfied.

3. The electric punching shear according to claim 1, characterized in that, When the outer diameter of the mounting part is defined as D1mm, the outer diameter of the receiving part is defined as D2mm, and the outer diameter of the end part of the die holder is defined as D3mm, D1≤D2+3mm and D2≤D3+3mm are satisfied.

4. The electric punching shear according to claim 1, characterized in that, The outer diameter of the mounting portion and the outer diameter of the receiving portion are below the outer diameter of the end portion of the die holder.

5. The electric punching shear according to any one of claims 1 to 4, characterized in that, The die retainer has a first mounting hole extending along the axial direction. The die has a second mounting hole coaxial with the first mounting hole, and is configured to be mounted to the die retainer by bolts inserted from the end portion of the die retainer into both the first and second mounting holes. The mounting portion includes: a cylindrical outer periphery; and a bottom having a third through hole communicating with the second through hole, and a third mounting hole coaxial with the first mounting hole and the second mounting hole. The mounting part is mounted to the end portion of the die holder by being tightened together by bolts inserted from the inside of the mounting part into the third mounting hole, the first mounting hole, and the second mounting hole.

6. The electric punching shear according to claim 5, characterized in that, The outer periphery of the mounting portion has a notch that is adjacent to the bottom and the bolt and extends radially through the outer periphery. The head of the bolt is partially located within the notch.

7. The electric punching shear according to claim 6, characterized in that, The mounting part and the receiving part are separate components. The receiving portion is installed in the mounting portion by fitting into it. With the receiving part installed onto the mounting part, the receiving part partially seals the notch.

8. The electric punching shear according to any one of claims 1 to 7, characterized in that, The receiving part is flexible.

9. The electric punching shear according to claim 8, characterized in that, The receiving part is in the form of a resin hose.

10. The electric punching shear according to any one of claims 1 to 9, characterized in that, The containment section is transparent to the extent that the containment status of the chips inside can be visually confirmed.

11. The electric punching shear according to any one of claims 1 to 10, characterized in that, The mounting part and the receiving part are separate components. The receiving portion is installed in the mounting portion by fitting into it. The receiving portion includes: a bottomless cylindrical receiving portion body; and a cover member that seals the opening by fitting into the opening of the receiving portion body. The engagement between the receiving part and the cover component requires less force to release compared to the engagement between the receiving part and the mounting part.

12. An electric punching shear, characterized in that, The electric punching shear has the following features: A punch is a long strip-shaped punch that extends along an axial direction and is capable of reciprocating along the axial direction. A die having a first through hole into which the end of the punch can be inserted; A die retainer having a recess for receiving the die, an end portion located further away from the punch in the axial direction than the recess, a second through hole communicating with the first through hole, and a first mounting hole extending along the axial direction; and A chip collection attachment is detachably mounted to the end portion of the die holder. The die has a second mounting hole coaxial with the first mounting hole, and is configured to be mounted to the die retainer by bolts inserted from the end portion of the die retainer into both the first and second mounting holes. The chip collecting accessory includes: a cylindrical outer periphery configured to be mounted on the end portion of the die holder; and a bottomed cylindrical receiving portion communicating with the interior of the mounting portion, for collecting the chips guided through the first through hole, the second through hole, and the mounting portion. The mounting portion includes: a cylindrical outer periphery; and a bottom having a third through hole communicating with the second through hole, and a third mounting hole coaxial with the first mounting hole and the second mounting hole. The mounting part is mounted to the end portion of the die holder by being tightened together by bolts inserted from the inside of the mounting part into the third mounting hole, the first mounting hole, and the second mounting hole.

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