Cutting accessory and electric cutting tool

Abstract

The present invention relates to a cutting accessory and an electric cutting tool. The cutting accessory includes: a driving cutting knife capable of rotating to generate a rotational cutting force; a driven cutting knife cooperating with the driving cutting knife to cut a soft workpiece; a pressing assembly including an elastic member and a protective sleeve. The elastic member is located inside the protective sleeve and presses against the inner wall of the protective sleeve to press the protective sleeve against the inner side of the driven cutting knife, and axially presses the outer side of the driven cutting knife against the driving cutting knife; a bracket, the protective sleeve is connected to the bracket, and the protective sleeve is non-rotatable relative to the bracket. In the cutting accessory of the present invention, while an elastic member is provided to ensure the cutting effect on the soft workpiece, a protective sleeve is provided to protect the elastic member, thereby improving the cutting efficiency and the service life of the driven cutting knife and the elastic member.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and particularly to a cutting accessory and an electric cutting tool. Background Art

[0002] In industrial production, it is often necessary to cut soft materials (such as paper or fabric materials, etc.) into materials of required sizes and shapes. In order to cut quickly, an electric cutting tool is required.

[0003] Patent CN2193796Y discloses a paper cutter, which sets a spring between a circular blade and a housing, and always presses the inner side of the circular blade on the cutter bar through the spring. In actual cutting work of such a paper cutter, friction will occur between the circular blade and the spring during rotation of the circular blade, and the spring will be driven to rotate, resulting in wear of the circular blade and the spring. In addition, debris generated during the cutting process is likely to remain on the spring, affecting the appearance and function of the paper cutter. Summary of the Invention

[0004] Based on the above defects in the prior art, the purpose of the present invention is to provide a cutting accessory, which sets an elastic member to ensure the cutting effect on soft workpieces, and sets a protective sleeve to protect the elastic member, so as to improve the cutting efficiency and the service life of the driven cutting blade and the elastic member.

[0005] For this reason, the present invention provides the following technical solutions.

[0006] The first object of the present invention is to provide a cutting accessory, which includes:

[0007] A driving cutting blade, which can rotate to generate a rotational cutting force;

[0008] A driven cutting blade, which cooperates with the driving cutting blade to cut soft workpieces;

[0009] A pressing assembly, which includes an elastic member and a protective sleeve. The elastic member is located inside the protective sleeve and presses against the inner wall of the protective sleeve to press the protective sleeve against the inner side of the driven cutting blade, and axially presses the outer side of the driven cutting blade on the driving cutting blade;

[0010] A bracket, the protective sleeve is non-rotatably connected to the bracket, and the driven cutting blade is rotatably connected to the bracket.

[0011] Preferably, the cross-section of the bracket is in a "U" shape, and it is provided with a concave cavity; the protective sleeve is arranged in the concave cavity, and one end of the elastic member abuts against the cavity wall of the concave cavity.

[0012] Preferably, the bracket is provided with a limiting hole, and the protective sleeve is provided with a limiting protrusion, and the limiting protrusion is snap-fitted into the limiting hole.

[0013] Preferably, a guiding portion is provided on one side of the bracket close to the driven cutting tool, and is used for guiding the cut soft workpiece away from the cutting accessory.

[0014] Preferably, the cutting accessory further includes a connecting shaft connected to the bracket; the driven cutting tool is rotatably connected to the connecting shaft, and the protective sleeve is sleeved on the rotating shaft of the driven cutting tool.

[0015] Preferably, the protective sleeve is provided with a rib extending towards the driven cutting tool, and the rib is in line contact with the side wall of the driven cutting tool.

[0016] Preferably, the rib is of an annular structure and is symmetric about the axis of the driven cutting tool.

[0017] Preferably, the circumferential surface of the driven cutting tool is provided with a guiding protrusion for guiding the soft workpiece to move to the cutting position.

[0018] The second object of the present invention is to provide an electric cutting tool, including:

[0019] The cutting accessory as described above;

[0020] An electric tool for driving the active cutting tool to rotate.

[0021] Preferably, the electric tool includes a handle and a motor, the cutting accessory includes a driving assembly, the output shaft of the motor is connected to the driving assembly, and the driving assembly is used for driving the active cutting tool to rotate.

[0022] The present invention has the following technical effects:

[0023] The present invention provides a cutting accessory. By providing an elastic member to apply an axial pressing force to the driven cutting tool, it is ensured that a clamping force with cutting ability can be formed between the active cutting tool and the driven cutting tool, so as to ensure the cutting effect on the soft workpiece. The elastic member is protected by a protective sleeve connected to the bracket. On the one hand, it can prevent the debris generated during the cutting process from remaining on the elastic member and avoid cutting failures. On the other hand, it can prevent the elastic member from directly contacting the driven cutting tool, preventing the elastic member from rotating with the driven cutting tool, and further avoiding the formation of ineffective friction between the elastic member and the driven cutting tool, reducing wear and tear, and improving the service life of the driven cutting tool and the elastic member. Description of the Drawings

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the electric cutting tool of the present invention;

[0025] Figure 2 Partial structural sectional enlarged view of the cutting accessory of the present invention;

[0026] Figure 3 Schematic perspective view of the protective cover of the present invention;

[0027] Figure 4 Schematic perspective view of the bracket of the present invention;

[0028] Figure 5 Schematic perspective view of the driven cutting tool of the present invention;

[0029] Figure 6 Partial structural enlarged view of the cutting accessory of the present invention Figure 1 ;

[0030] Figure 7 Partial structural enlarged view of the cutting accessory of the present invention Figure 2 ;

[0031] Figure 8 Exploded structural view of the electric cutting tool of the present invention.

[0032] Explanation of reference numerals

[0033] 100, electric cutting tool;

[0034] 1, active cutting tool;

[0035] 2, driven cutting tool; 21, rotating shaft; 22, guiding protrusion;

[0036] 3, pressing component; 31, elastic member; 32, protective cover; 321, limiting protrusion; 322, rib; 323, supporting rib; 324, annular opening;

[0037] 4, bracket; 41, concave cavity; 42, limiting hole; 43, guiding portion; 44, guiding groove; 45, supporting wall; 451, first mounting hole; 46, second mounting hole;

[0038] 5, connecting shaft;

[0039] 6, handle; 61, switch;

[0040] 7, driving component; 71, first gear; 72, second gear;

[0041] 8, main housing. Detailed implementation manners

[0042] To make the technical solutions and beneficial effects of the present invention more obvious and understandable, the following provides a detailed description by way of specific examples. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical and scientific fields to which this application belongs.

[0043] In the description of the present invention, unless otherwise clearly defined, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplifying the description of the present invention, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present invention.

[0044] In the present invention, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" can clearly include at least one of such features. In the description of the present invention, "a plurality of" means at least two; "several" means at least one; unless otherwise clearly defined.

[0045] In the present invention, unless otherwise clearly defined, terms such as "installation", "connection", "coupling", "fixing", "setting", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection or an integral molding; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly defined, the first feature being "on", "above", "over" and "upon" the second feature, or "under", "beneath", "below" or "underneath" the second feature can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "upon" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0047] The following is based on Figures 1 to 8Describe in detail the electric cutting tool of the present invention.

[0048] In this embodiment, as Figure 1 and Figure 2 shown, the electric cutting tool 100 includes a cutting accessory and a power tool. The power tool can generate a rotational driving force, and the output shaft of the power tool is connected to the cutting accessory to drive the cutting accessory to perform cutting.

[0049] The cutting accessory includes a driving cutting knife 1, a driven cutting knife 2, a pressing component 3 and a bracket 4. The driving cutting knife 1 can rotate under the drive of the power tool to generate a rotational cutting force. When cutting, the driven cutting knife 2 cooperates with the driving cutting knife 1 to clamp the soft workpiece. The driving cutting knife 1 rotates actively in one direction (such as counterclockwise rotation), and the driven cutting knife 2 is driven to rotate in the reverse direction (such as clockwise rotation) by the frictional force between the driving cutting knife 1 and the driven cutting knife 2. In this way, the driving cutting knife 1 and the driven cutting knife 2 cooperate to cut the soft workpiece clamped between the two.

[0050] The pressing component 3 includes an elastic member 31 and a protective sleeve 32. The elastic member 31 is located inside the protective sleeve 32 and the elastic member 31 presses against the inner wall of the protective sleeve 32 to press the protective sleeve 32 against the inner side of the driven cutting knife 2, and to axially press the outer side of the driven cutting knife 2 against the driving cutting knife 1. Further, the protective sleeve 32 is non-rotatably connected to the bracket 4, and the driven cutting knife 2 is rotatably connected to the bracket 4. The protective sleeve 32 is non-rotatable relative to the bracket 4. In this way, when the driven cutting knife 2 rotates, the protective sleeve 32 and the elastic member 31 located inside the protective sleeve 32 do not rotate.

[0051] By adopting the above technical solution, the pressing component 3 provides a certain pre-pressing force through the elastic member 31 to apply an axial pressing force to the driven cutting knife 2, so that the driving cutting knife 1 and the driven cutting knife 2 can be in contact without gaps, ensuring that a clamping force with cutting ability can be formed between the driving cutting knife 1 and the driven cutting knife 2 to ensure the cutting effect on the soft workpiece. In addition, the elastic member 31 is protected by the protective sleeve 32 connected to the bracket 4. On the one hand, it can prevent debris generated during the cutting process from remaining on the elastic member 31 and avoid cutting failures. On the other hand, it can prevent the elastic member 31 from directly contacting the driven cutting knife 2, preventing the elastic member 31 from rotating along with the driven cutting knife 2, and further avoiding the formation of ineffective friction between the elastic member 31 and the driven cutting knife 2, reducing losses, and improving the service life of the driven cutting knife 2 and the elastic member 31. Moreover, setting the protective sleeve 32 can also improve the aesthetic appearance of the cutting accessory.

[0052] It should be understood that the soft workpiece includes but is not limited to paper workpieces or cloth workpieces.

[0053] In one embodiment, asFigure 2 As shown, the elastic member 31 is a spring, which has a simple structure and is easy to install. Of course, the structure of the elastic member 31 is not limited to this, and it can also be any other structure with elastic deformation ability, such as an elastic cylinder.

[0054] In one embodiment, as Figure 2 and Figure 4 shown, the cross-section of the bracket 4 is generally in a "U" shape, which has high structural stability and strong anti-deformation ability. The bracket 4 is provided with a concave cavity 41, the protective sleeve 32 is arranged in the concave cavity 41, one end of the elastic member 31 abuts against the cavity wall of the concave cavity 41, and the other end of the elastic member 31 abuts against the inner wall of the protective sleeve 32. In this way, the internal space of the concave cavity 41 is used to accommodate the pressing component 3, which is beneficial to the miniaturized design of the whole cutting accessory, and can also improve the aesthetic appearance of the cutting accessory. In addition, the support walls 45 on both sides of the bracket 4 can provide double-point support for the soft workpiece, avoid cutting skew, and improve the cutting quality and efficiency.

[0055] Furthermore, as Figures 2 to 4 shown, the bracket 4 is provided with a limiting hole 42, and the protective sleeve 32 is provided with a limiting protrusion 321. The limiting protrusion 321 is clamped in the limiting hole 42 to prevent the protective sleeve 32 from rotating with the driven cutting tool 2 together, resulting in ineffective friction between the protective sleeve 32 and the elastic member 31. In addition, the protective sleeve 32 is detachably connected to the bracket 4. When the protective sleeve 32 is worn, it can be replaced in time.

[0056] Furthermore, as Figure 2 and Figure 3 shown, at least two support ribs 323 are provided at the bottom of the protective sleeve 32. The two support ribs 323 are respectively connected to both sides of the limiting protrusion 321. When the limiting protrusion 321 is clamped in the limiting hole 42, the support ribs 323 abut against the cavity wall at the bottom of the concave cavity 41 to stably install the protective sleeve 32.

[0057] Of course, the assembly structure of the bracket 4 and the protective sleeve 32 is not limited to this, and it can also be fixed by other methods such as fixing with fasteners or magnetic adsorption to limit the relative rotation of the protective sleeve 32 with respect to the bracket 4.

[0058] Furthermore, as Figure 2 and Figure 4 shown, the bottom wall of the bracket 4 is provided with a guide groove 44, the limiting hole 42 is located in the guide groove 44, and the limiting protrusion 321 is arranged at the bottom of the protective sleeve 32. During assembly, first pre-assemble the pressing component 3 and the driven cutting tool 2, and then assemble the assembled pre-assembled part on the bracket 4. When assembling these two, slide the limiting protrusion 321 of the protective sleeve 32 along the guide groove 44. When the limiting protrusion 321 slides to the limiting hole 42, clamping is achieved. The guide groove 44 plays a guiding role during the installation of the protective sleeve 32 on the bracket 4, which can simplify the assembly operation.

[0059] In one embodiment, as shown in Figure 2 , Figure 4 and Figure 7 , a guiding portion 43 is provided on one side of the bracket 4 close to the driven cutting tool 2, and is used to guide the cut soft workpiece away from the cutting attachment. By providing the guiding portion 43, the cutting seam of the soft workpiece is separated when it collides with the guiding portion 43, so as to be able to guide the cut soft workpiece away from the cutting attachment in time, and avoid its accumulation at the cutting position of the cutting attachment, resulting in cutting blockage.

[0060] In one embodiment, as shown in Figure 2 , the cutting attachment further includes a connecting shaft 5, which is connected to the bracket 4; the driven cutting tool 2 is rotatably connected to the connecting shaft 5, and the assembly of the driven cutting tool 2 is simple and fast. The protective sleeve 32 is sleeved on the rotating shaft 21 of the driven cutting tool 2, and the assembly between the pressing component 3 and the driven cutting tool 2 can be compact. During specific assembly, first pre-assemble the driven cutting tool 2 and the pressing component 3, then fix the protective sleeve 32 on the bracket 4 through the assembly structure between the protective sleeve 32 and the bracket 4, and then assemble the driven cutting tool 2 on the bracket 4 through the connecting shaft 5, thus completing the assembly of the driven cutting tool 2 and the pressing component 3.

[0061] Furthermore, as shown in Figure 2 , an elastic member 31 is sleeved on the outer periphery of the rotating shaft 21 of the driven cutting tool 2, the protective sleeve 32 is sleeved on the outer periphery of the elastic member 31, and an annular opening 324 is provided on the end face of the protective sleeve 32. The rotating shaft 21 of the driven cutting tool 2 is inserted into the annular opening 324, and the radial movement of the protective sleeve 32 is restricted by the rotating shaft 21. One end of the protective sleeve 32 abuts against the inner side of the driven cutting tool 2, and the other end of the protective sleeve 32 abuts against the bracket 4, thereby restricting the axial movement of the protective sleeve 32. By the snap connection between the limiting protrusion 321 and the limiting hole 42, the rotation of the protective sleeve 32 is restricted, thus restricting the six degrees of freedom of the protective sleeve 32.

[0062] Furthermore, as shown in Figure 2 and Figure 4 , first mounting holes 451 are respectively provided on the supporting walls 45 on both sides of the bracket 4, and both ends of the connecting shaft 5 are respectively connected to the two first mounting holes 451.

[0063] In one embodiment, as shown in Figure 2 and Figure 3 , the protective sleeve 32 is provided with a rib 322 extending towards the driven cutting tool 2, and the rib 322 presses against the inner side wall of the driven cutting tool 2. The rib 322 is in line contact with the driven cutting tool 2, so as to reduce the contact area between the protective sleeve 32 and the driven cutting tool 2, and further be able to reduce the frictional resistance generated between the rotating driven cutting tool 2 and the protective sleeve 32, and improve the cutting efficiency of the cutting attachment.

[0064] Further, as Figure 3 shown, the convex rib 322 is a ring structure, which is symmetric about the axis of the driven cutting tool 2 to ensure uniform force application.

[0065] In one embodiment, as Figure 2 and Figure 5 shown, the circumferential surface of the driven cutting tool 2 is provided with a guiding projection 22. The guiding projection 22 can increase the frictional force between the rotating driven cutting tool 2 and the soft workpiece, thereby guiding the soft workpiece to the cutting position and improving the cutting efficiency.

[0066] In one embodiment, as Figure 1 , Figure 7 and Figure 8 shown, the power tool includes a handle 6 and a motor (not shown in the figure). The handle 6 is for the user to hold. The main body of the motor is located inside the handle 6, and the output shaft of the motor is located outside the handle 6. The cutting accessory includes a driving assembly 7. The output shaft of the motor is connected to the driving assembly 7, and the driving assembly 7 is used to drive the active cutting tool 1 to rotate.

[0067] Further, as Figure 7 shown, the driving assembly 7 includes a first gear 71 and a second gear 72 that mesh with each other. The axis of the first gear 71 and the axis of the second gear 72 are perpendicular to each other. The output shaft of the motor is coaxially connected to the first gear 71, and the second gear 72 is coaxially connected to the active cutting tool 1. When the motor operates, under the transmission cooperation of the first gear 71 and the second gear 72, the active cutting tool 1 rotates. Of course, the structure of the driving assembly 7 is not limited to this. It can be that the motor directly drives the active cutting tool 1 to rotate, or it can also be any other driving structure that can form a rotational driving force.

[0068] Further, as Figure 1 shown, the handle 6 is provided with a switch 61 for turning on or off the cutting operation.

[0069] In one embodiment, as Figure 1 shown, the cutting accessory further includes a main housing 8, and the active cutting tool 1 is connected to the main housing 8. As Figure 4 shown, the bracket 4 is provided with a second mounting hole 46, and the second mounting hole 46 cooperates with a fastener (such as a screw) to connect the bracket 4 to the main housing 8.

[0070] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can also be made on the basis of the above embodiments. Similarly, various technical features of the above embodiments can also be arbitrarily combined to form additional embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only represent several implementation manners of the present invention and do not limit the protection scope of the present invention patent.

Claims

1. A cutting attachment, characterized in that, The cutting accessory includes: A driving cutting tool (1) capable of rotating to generate a rotational cutting force; A driven cutting tool (2) cooperating with the driving cutting tool (1) to cut a soft workpiece; A pressing component (3) including an elastic member (31) and a protective sleeve (32), the elastic member (31) being located inside the protective sleeve (32) and pressing against the inner wall of the protective sleeve (32) to press the protective sleeve (32) against the inner side of the driven cutting tool (2), and axially pressing the outer side of the driven cutting tool (2) against the driving cutting tool (1); A bracket (4), the protective sleeve (32) being non-rotatably connected to the bracket (4), and the driven cutting tool (2) being rotatably connected to the bracket (4).

2. The cutting attachment according to claim 1, wherein The cross-section of the bracket (4) is in a "U" shape and is provided with a concave cavity (41); the protective sleeve (32) is arranged in the concave cavity (41), and one end of the elastic member (31) abuts against the cavity wall of the concave cavity (41).

3. The cutting attachment according to claim 2, wherein, The bracket (4) is provided with a limiting hole (42), and the protective sleeve (32) is provided with a limiting protrusion (321), and the limiting protrusion (321) is snap-fitted into the limiting hole (42).

4. The cutting accessory according to claim 1, characterized in that, A guiding portion (43) is provided on one side of the bracket (4) close to the driven cutting tool (2) for guiding the cut soft workpiece away from the cutting accessory.

5. The cutting accessory according to claim 1, characterized in that, The cutting accessory further includes a connecting shaft (5) connected to the bracket (4); the driven cutting tool (2) is rotatably connected to the connecting shaft (5), and the protective sleeve (32) is sleeved on the rotating shaft (21) of the driven cutting tool (2).

6. The cutting attachment according to any one of claims 1-5, characterized in that, The protective sleeve (32) is provided with a rib (322) extending towards the driven cutting tool (2), and the rib (322) is in line contact with the side wall of the driven cutting tool (2).

7. The cutting accessory according to claim 6, characterized in that, The rib (322) is in a ring structure and is symmetric about the axis of the driven cutting tool (2).

8. The cutting accessory according to any one of claims 1-5, characterized in that, The circumferential surface of the driven cutting tool (2) is provided with a guiding protrusion (22) for guiding the soft workpiece to move to the cutting position.

9. An electric cutting tool, characterized in that, Comprising: The cutting accessory according to any one of claims 1-8; A power tool for driving the driving cutting tool (1) to rotate.

10. The electric cutting tool according to claim 9, characterized in that, The power tool includes a handle (6) and a motor, the cutting accessory includes a driving component (7), the output shaft of the motor is connected to the driving component (7), and the driving component (7) is used to drive the driving cutting tool (1) to rotate.

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