Handheld electric scissors

Abstract

The invention relates to the technical field of electric tools, in particular to handheld electric scissors with a grinding assembly. A pair of handheld electric scissors comprises a rotary blade, a machine shell, a motor driving the blade to rotate and a grinding assembly used for grinding the blade. The grinding assembly comprises a knife stone, a driving piece capable of being rotated by a user, a driven piece rotating along with the driving piece and a bias piece applying reset force to the knife stone. The knife stone can be switched between a first (working) position and a second (non-working) position. The driven piece is fixed to the knife stone, a pushed part is arranged on the driven piece, a pushing part is arranged on the driving piece, and the pushed part abuts against the pushing part through a slope. When a user pokes the driving part to rotate around the central axis of the driving part, the pushing part extrudes the pushed part, so that the driven part overcomes the acting force of the bias part to move along the central axis, the knife stone is driven to be switched from the second position to the first position, and polishing maintenance of the rotating blade is achieved. Through the grinding assembly, it is ensured that grinding operation is simple and convenient, and the blade sharpness is effectively maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric tools, in particular to a handheld electric scissors with a grinding assembly. BACKGROUND

[0002] In the field of handheld electric tools, electric scissors are widely used in cutting operations of various materials. As disclosed in CN101522352B, the electric scissors meet the needs of users for convenient cutting to a certain extent, and realize more efficient operation than manual scissors by means of motor driving. However, the electric scissors involved in this patent have obvious defects, one of which is the lack of whetstone configuration. In actual use, the blade of the electric scissors will gradually become dull due to frequent cutting of various materials (such as cloth, leather, metal sheet, etc.), which greatly affects the cutting efficiency and quality, resulting in uneven cutting, easy tearing of materials, etc. When the blade is dull to a certain extent, the user often has to replace the blade, which not only increases the use cost, but also delays the work progress when the blade inventory is insufficient. If a structure assembly containing a whetstone is reasonably added to the structure of the electric scissors, the user can timely polish the blade when it is slightly dull, maintain the sharpness of the blade, prolong the service life of the blade, reduce the frequency of replacing the blade, and improve the overall performance of the electric scissors. SUMMARY

[0003] The purpose of the present application is to provide a handheld electric scissors to solve the problems raised in the background.

[0004] To achieve the above purpose, the present application provides the following technical scheme: A handheld electric scissors, comprising: a rotating blade; a casing; a motor arranged in the casing, the motor driving the rotating blade to rotate; and a grinding assembly for polishing the rotating blade; wherein the grinding assembly comprises: a whetstone having a first position and a second position, the whetstone being in contact with the rotating blade for polishing at the first position, and the whetstone being separated from the rotating blade at the second position; a driven part fixedly connected with the whetstone, the driven part being provided with a pushed part; a driving part capable of being rotated by a user, the driving part being provided with a pushing part, the pushing part being used for abutting against the pushed part; a biasing part applying a force to the whetstone to move it from the first position to the second position; wherein the pushing part and / or the pushed part form a slope surface; when the driving part is rotated around the central axis under the action of an external force, the pushing part presses the pushed part to make the driven part move along the central axis from the second position to the first position against the force of the biasing part.

[0005] As a further solution: the handheld electric scissors further comprise a guide structure for guiding the sliding of the driven member along the central axis; the driven member slides along the guide structure.

[0006] As a further solution: the guide structure comprises a guide sleeve; the guide sleeve is provided with a sliding groove; the driven member is provided with a sliding block which is in sliding cooperation with the sliding groove; the sliding block is provided with a hook-shaped protrusion; the sliding groove is provided with a groove which matches the hook-shaped protrusion, and the hook-shaped protrusion is clamped into the groove to limit the sliding block; the number of the sliding blocks is several; the several sliding blocks are evenly distributed around the central axis.

[0007] As a further solution: the guide structure is arranged in the casing; the driving member partially extends out of the casing, and the casing axially limits the driving member to prevent the driving member from being axially displaced by the biasing member.

[0008] As a further solution: a return spring is arranged between the driving member and the casing; one end of the return spring is fixed to the casing, and the other end of the return spring is fixed to the driving member; when the external force is removed, the return spring drives the driving member to automatically reset.

[0009] As a further solution: the pushing part and the pushed part are both formed as slope surfaces; the slope surface of the pushing part is arranged towards the driven member; and the slope surface of the pushed part is arranged towards the driving member.

[0010] As a further solution: in the second position, the pushing part and the pushed part are embedded into each other.

[0011] As a further solution: the biasing member is an elastic member; one end of the elastic member abuts against the casing, and the other end of the elastic member abuts against the driven member.

[0012] As a further solution: the biasing member is a return spring; the return spring is arranged in the guide sleeve; the driven member comprises a driven pushing block and a supporting shaft; the return spring is sleeved on the supporting shaft and abuts against the driven pushing block.

[0013] As a further solution: the rotary blade is located at one side of the casing, and the driving member is located at the other side of the casing.

[0014] Compared with the prior art, the handheld electric scissors have the following beneficial effects: 1. By integrating the grinding assembly comprising the whetstone in the handheld electric scissors, the slope surface cooperation structure of the pushing part of the driving member and the pushed part of the driven member is used to convert the rotary force into the axial thrust when the user rotates the driving member, so that the driven member drives the whetstone to overcome the action force of the biasing member to reliably switch between the first position and the second position. The slope surface transmission and the biasing member reset design are labor-saving, so that the grinding operation is simple and convenient, and the sharpness of the blade is effectively maintained.

[0015] 2. The guide structure restricts the radial oscillation of the driven component through the guide sleeve. The sliding fit between the groove and the slider provides a stable motion track for the driven component, while several sliders evenly distributed around the central axis provide support from multiple directions, distributing the force to prevent the driven component from rotating and improving the overall structural stability. At the same time, the hook-shaped protrusions of the slider engage with the matching grooves of the groove, which not only restricts the axial displacement of the slider but also prevents the slider from accidentally disengaging.

[0016] 3. The axial limiting design of the active component and the housing can counteract the reverse force of the biasing component. The housing transmits the axial force to itself through the limiting design, forming a stable reaction force balance, which directly restricts the axial displacement of the active component, avoiding misalignment or separation of the pushing part and the pushed part due to displacement, thereby ensuring the stability of the slope contact between the two and the accuracy of force transmission.

[0017] 4. The slope interlocking structure of the pushing part and the pushed part improves the efficiency of force transmission. By tilting the angle, the rotational force of the driving part is decomposed into the axial thrust that drives the driven part to move. In the interlocking state, the two slopes are completely in contact with each other and the contact area is large, which can avoid local slippage caused by "point contact" or "line contact" and prevent the driven part from being displaced relative to the driving part.

[0018] 5. The return spring and the resetting function of the biasing component enable the driving component and the whetstone to automatically reset after the external force is removed, making operation more effortless.

[0019] 6. The rotating blade and the drive mechanism are located on opposite sides of the housing, and are indirectly linked through the internal structure of the housing. This increases the safe distance between the user's hand and the rotating blade, reducing the risk of accidental hand contact with the blade during operation.

[0020] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0021] Figure 1 A 3D diagram of a handheld electric scissors; Figure 2 for Figure 1 A rear-view 3D diagram of a handheld electric scissors; Figure 3 for Figure 1 A three-dimensional view of a handheld electric shears from below; Figure 4 for Figure 3 A cross-sectional view along the BB direction; Figure 5 for Figure 1 A schematic diagram showing the partial structural separation of a handheld electric scissors; Figure 6 for Figure 5 A schematic diagram of the main unit casing; Figure 7 forFigure 1 The removal end cover, protective cover, lower blade, base of the handheld electric scissors are shown in the schematic view. Figure 8 For Figure 7 the local enlarged view at C in the figure. Figure 9 For Figure 7 the schematic view of the grinding assembly in the figure. Figure 10 For Figure 1 the sectional view of the A-A direction.

[0022] List of reference numerals: handheld electric scissors 100; rotary blade 11; motor 12; battery 13; gear box 14; output shaft 141; trigger 15; spring 151; rebound spring 152; circuit board 16; battery holder 17; protective cover 18; inner holder 19; casing 20; main casing 201; tool driving part 2011; holding part 2012; positioning rib 2013; display screen 2014; bottom surface 2015; limiting rib 2016; soft rubber layer 2017; end cover 202; tail cover 203; side cover 204; charging interface 2031; rotary groove 2041; grinding assembly 21; grinding stone 211; driven part 212; support shaft 2121; driven push block 2122; pushed part 2123; sliding block 2124; hook-shaped protrusion 2125; driving part 213; knob 2131; rotating block 2132; pushing part 2133; protrusion 2134; biasing part 214; return spring 22; guide sleeve 23; sliding groove 231; base 25; lower blade 251. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] As Figure 1 , Figure 4 and Figure 7 shown, a handheld electric scissors 100 comprises: rotary blade 11, motor 12, battery 13, gear box 14, casing 20, grinding assembly 21.

[0025] As Figure 1As shown, the rotating blade has various designs for cutting objects. In one specific embodiment, the rotating blade 11 is a polygonal blade, such as a decagonal blade, with a cutting edge on each side, suitable for precisely cutting materials. Alternatively, the rotating blade can also be a circular blade with sharp cutting edges, providing a smooth and uniform cutting effect.

[0026] like Figures 4-5 As shown, the housing 20 includes a main housing 201 and an end cap 202. In one specific embodiment, the main housing 201 forms a receiving cavity. The motor 12, battery 13, and gearbox 14 are all located within the receiving cavity. The main housing 201 includes a tool drive unit 2011 and a grip unit 2012 for the user to hold. The main housing 201 adopts a one-piece molding design, manufactured through injection molding or die casting processes to form a continuous integral structure. This one-piece molding design creates a seamless, continuous integral structure, with no physical splicing points between the tool drive unit 2011 and the grip unit 2012. This not only eliminates the need for connecting structures such as screws and clips required for component splicing, reducing the risk of separation at seams, but also ensures uninterrupted and lossless force transmission. Force can be directly transmitted along a continuous material medium, avoiding force dispersion, offset, or frictional loss at seams. This results in greater overall rigidity, less local deformation under stress, and higher structural stability.

[0027] Specifically, the handheld electric scissors 100 has mutually perpendicular X, Y, and Z axes. The grip 2012 extends along the X-axis. The projections of the motor 12, battery 13, and gearbox 14 along the Y and Z axes do not exceed the outer periphery projection line of the main housing 201. The outer periphery projection line refers to the outermost boundary line of the main housing 201 in a specific direction. This means that the outermost boundaries of the motor 12, battery 13, and gearbox 14 along the Y and Z axes are completely contained within the outermost boundary line of the main housing 201. This layout ensures the compact design of the handheld electric scissors and provides a basis for the unibody design of the main housing 201: there is no need to design complex splicing or hollow structures to avoid protruding parts, thus reducing structural weak points. The complete contour enclosure allows the main housing 201 to form a continuous rigid support frame, evenly distributing the vibration and stress of internal components throughout the entire housing, significantly improving overall strength and impact resistance.

[0028] Specifically, the holding portion 2012 contains the battery 13. The battery 13 powers the motor 12. The battery 13 is completely covered by the holding portion 2012 along the circumferential direction around the X axis. As a specific embodiment, a battery holder 17 can also be optionally arranged inside the holding portion 2012 to directly fix and support the battery 13, wherein the battery holder 17 is composed of two halves, each of which fixes the battery 13 from two sides, and both halves are injection molded parts, which are symmetrical to each other with the X axis as the central axis, ensuring the reliability of the battery 13 during use and reducing potential damage to the battery 13 caused by external impact. The battery holder 17 is fixed to the inner wall of the holding portion 2012 by screws. As an optional embodiment, the battery holder can also be omitted, and the inner wall of the holding portion directly wraps and fixes the battery. On the one hand, the circumferential covering structure of the holding portion along the X axis forms natural limiting to the battery from the radial direction by the precise fit of the inner wall contour and the battery shape, avoiding large shaking of the battery inside the holding portion; on the other hand, the inner wall of the holding portion can further constrain the axial displacement of the battery through simple limiting structures such as pre-set ribs and clamping grooves.

[0029] Further, the holding portion 2012 is provided with a trigger hole. The trigger 15 passes through the trigger hole and is pressed by the user to start the motor 12, so that the user can conveniently control the operation of the electric scissors.

[0030] Further, as shown in Figure 10 , a circuit board 16 is arranged between the battery 13 and the trigger 15, and the circuit board 16 is arranged parallel to the battery 13, and the battery 13 provides power for the circuit board 16. As a specific embodiment, the circuit board 16 is fixed to the battery holder 17, and the bottom of the battery holder 17 is recessed to form a groove-shaped accommodating space matching the shape of the circuit board 16, and the contour of the groove-shaped accommodating space is matched with the edge of the circuit board 16. The circuit board 16 is entirely embedded in the groove, which not only provides additional limiting for the circuit board 16, but also exposes the bottom surface 2015 of the circuit board 16 through the groove space to the conductive contact of the trigger 15, ensuring the compactness of the overall structure.

[0031] As a specific embodiment, as shown in Figure 4As shown, the side of the trigger 15 close to the circuit board 16 is fixed with a conductive spring 151 by screws, the end of the spring 151 is bent to form a contact point which can contact the circuit board 16 under the pressing action of the trigger 15. The side of the trigger 15 close to the circuit board 16 is also provided with a rebound spring 152, one end of the rebound spring 152 abuts against the trigger 15, and the other end abuts against the non-conductive area on the circuit board 16. In the natural state, the rebound spring 152 is in the stretched state, and pushes the trigger 15 away from the circuit board 16 by the elastic force. At this time, the spring 151 is far away from the circuit board 16 due to the initial position of the trigger 15, the contact point is completely separated, and the circuit is in the open state. When the user holds the holding part 2012 and presses the trigger 15, the trigger 15 slides along the hole of the trigger 15, compresses the rebound spring 152 and drives the spring 151 to move synchronously, the spring 151 contacts the circuit board 16 to form a closed loop, drives the motor 12 to operate, and drives the rotary blade 11 to work. When the trigger 15 is released, the rebound spring 152 releases the elastic potential energy and pushes the trigger 15 to reset to the initial position. The spring 151 is separated from the circuit board 16 with the trigger 15, the loop is disconnected, and the motor 12 stops working immediately. As an optional embodiment, the trigger can also be a micro switch or a mechanical contact switch.

[0032] Further, as shown in Figure 5 The end of the holding part 2012 away from the tool driving part 2011 along the X-axis direction is open, forming an opening through the internal cavity, and the tail cover 203 is buckled and fixed at the opening end. The charging interface 2031 is provided on the outer surface of one side of the tail cover 203 along the X-axis direction, and the inner side is electrically connected to the circuit board 16 through a wire. When the battery 13 needs to be charged, the plug of the external charger can be directly inserted into the charging interface 2031 to charge the battery 13. As an optional embodiment, a disposable battery scheme that cannot be charged can be selected, and the battery can be conveniently replaced by buckling the tail cover, and the charging circuit is omitted. The battery design can also be cancelled, and a power supply interface is integrated in the tail cover, and the external adapter is directly powered. A non-removable battery can also be designed with a wireless charging coil, the tail cover is fully sealed without a physical interface, and wireless charging is realized through a special base.

[0033] Further, as shown in Figure 6 The upper side of the holding part 2012, i.e., the area where the palm is attached when the user holds it, is provided with a soft rubber layer 2017. The soft rubber layer 2017 is designed in a semi-wrapping manner and extends along the arc-shaped contour of the upper side of the holding part 2012, covering from the front end close to the tool driving part 2011 to the rear end close to the tail cover 203. The soft rubber material can absorb the vibration generated during the operation of the motor 12, reduce the vibration sensation transmitted to the hand, and reduce the fatigue feeling during long-time operation.

[0034] As a specific embodiment, as shown in Figures 4-5As shown, the tool driving part 2011 is used to accommodate the motor 12, which is the power source of the electric scissors, and the gear box 14, which is driven by the motor 12 to drive the rotary blade 11 to rotate to adapt to different cutting requirements.

[0035] Specifically, the rotary blade 11 has a rotation axis parallel to the Y axis, and the gear box 14 is provided with an output shaft 141 extending out of one side of the tool driving part 2011 and fixed with the rotary blade 11 to realize power transmission.

[0036] Further, as shown, Figures 4-6 The handheld electric scissors 100 further includes an inner frame 19 fixed to the tool driving part 2011 by screws. As an optional embodiment, the fixing mode can also be buckle fixing to ensure the stable installation of the inner frame 19 in the tool driving part 2011. The inner frame 19 is provided with an arc-shaped clamping surface on the side facing the inner wall of the tool driving part 2011, which is adapted to the profile of the motor 12 and the gear box 14, and cooperates with the inner wall of the tool driving part 2011 to clampingly fix the motor 12 and the gear box 14 from both sides to form a stable clamping structure and reduce displacement or loosening caused by vibration or external force. As a specific embodiment, the inner wall of the tool driving part 2011 is provided with a plurality of positioning ribs 2013 extending along the Y axis direction, and the plurality of positioning ribs 2013 are parallel strip-shaped protrusions distributed along the X axis direction. The inner side of the positioning ribs 2013 also forms an arc-shaped supporting surface that fits the outer wall of the motor 12 and the gear box 14. During assembly, the motor 12 and the gear box 14 are arranged in sequence along the length direction of the body, and the arc-shaped clamping surface of the inner frame 19 gradually approaches the positioning ribs 2013 to form radial clamping of the motor 12 and the gear box 14.

[0037] Further, the tool driving part 2011 is provided with an opening that is open along the X axis direction, and an end cover 202 covers the opening and is buckle-fixed with the tool driving part 2011, so that the end cover 202 and the tool driving part 2011 wrap the gear box 14 and the motor 12.

[0038] Further, the tool driving part 2011 is further provided with a display screen 2014 for displaying the state information of the electric scissors, and the display screen 2014 is electrically connected with the circuit board 16. The displayable state information includes one or several of the following states: the remaining power of the battery 13 (presented in percentage or power level form), the current working mode (such as high-speed or low-speed cutting gear), and the fault code (such as the corresponding code displayed when the motor 12 is overloaded or the battery 13 is under-voltage).

[0039] Specifically, the display screen 2014 can be observed from one side of the end cover 202, and the end cover 202 covers the display screen 2014. As a specific embodiment, the end cover 202 can be a translucent or transparent material, which neither blocks the text, icons or data display of the display screen 2014, nor completely covers the display screen 2014 from the external environment, effectively preventing the direct damage of dust, water vapor or slight collision to the screen. Specifically, the end cover 202 retains the original transparent property in the local area matching the display screen 2014, ensuring that the user can clearly observe the screen content; and the area of the end cover 202 corresponding to the display screen 2014 realizes the non-transparent effect through surface process treatment. Both the visibility and protection of the display screen 2014 are ensured, and the internal non-display components are hidden through process treatment, making the appearance of the end cover 202 more simple and unified, avoiding the exposure of the internal structure of the transparent material affecting the appearance. As an optional embodiment, the end cover is made of opaque plastic material, and an observation hole matching the size of the display screen is formed at the position corresponding to the display screen. A transparent protective sheet is further embedded in the observation hole, and the size of the transparent protective sheet is slightly larger than that of the observation hole. The edge of the transparent protective sheet is fixedly connected with the edge of the observation hole of the end cover, so that the transparent protective sheet completely covers the observation hole. Both the display content of the display screen can be clearly observed through the transparent protective sheet, and the dust, water vapor and the like are prevented from entering the inside of the end cover through the observation hole to contact the display screen. At the same time, the outer surface of the transparent protective sheet is flush with the outer surface of the end cover, so that the end cover as a whole maintains a flat appearance, avoiding the appearance of protrusions or depressions affecting the use feeling or aesthetic degree.

[0040] Further, the bottom surface 2015 of the tool driving part 2011 is a plane, the bottom surface 2015 is substantially parallel to the X axis and the rotation axis of the rotary blade 11, the bottom surface 2015 extends along the rotation axis of the rotary blade 11 from one side of the shell 20 to the other side of the shell 20, and the width of the bottom surface 2015 along the Y axis direction is consistent with the width of the tool driving part 2011, so that the structure is more uniform in stress.

[0041] Further, as shown in FIG. 6, the tool driving part 2011 is provided with a plurality of tool driving parts 2011, and the tool driving parts 2011 are arranged in the shell 20 along the Y axis direction. Figure 1As shown, the outer side of the rotary blade 11 is provided with an arc-shaped protective cover 18, one end of which is connected with the side surface of the tool driving part 2011, and the other end extends above the edge of the rotary blade 11, which neither affects the rotation of the blade nor blocks the cutting debris from splashing and prevents accidental touching by hands. The bottom of the tool driving part 2011 is fixed with a base 25, and the lower blade 251 is fixed on the base 25 by screws, and the cutting edge thereof is in an interlocking engagement state with the cutting edge of the rotary blade 11. When the rotary blade 11 rotates at a high speed, the cooperation with the stationary lower blade 251 forms a shearing action, realizing the accurate cutting of the material. The base 25 simultaneously forms a stable support for the lower blade 251, avoiding displacement due to force during cutting, and ensuring the shearing precision. When the handheld electric scissors 100 is placed on a plane, such as a workbench, the base 25 can be completely attached to the placement surface, forming a stable operation reference, especially when cutting thick or hard materials (such as leather, thin metal sheets), which can significantly improve the operation stability and reduce the cutting deviation caused by tool shaking.

[0042] Further, as shown in the drawings, Figures 5-6 a side cover 204 is arranged on the side of the main shell 201 opposite to the rotary blade 11, which is a plate-shaped structure adapted to the side wall of the tool driving part 2011, and is fixed with the tool driving part 2011 by buckling or bolts. The inner wall surface of the side of the tool driving part 2011 away from the side cover 204 is formed with a limiting rib 2016 for positioning the gear box 14, which is a closed ring shape, and the inner diameter thereof is adapted to the outer diameter of the shell of one end of the output shaft 141 of the gear box 14. At the same time, the side cover 204 cooperates with the limiting rib 2016 to clamp the gear box 14 from both sides, limiting the deflection of the gear box 14 during operation.

[0043] As shown in the drawings, Figures 7-9 the grinding assembly 21 includes a grinding stone 211, a driven part 212, a driving part 213 and a biasing part 214, which are used for grinding the rotary blade 11.

[0044] The grinding stone 211 has a first position and a second position. The grinding stone 211 is in contact with the rotary blade 11 at the first position, and can grind the rotary blade 11. The grinding stone 211 is separated from the rotary blade 11 at the second position, and stops the grinding work.

[0045] The driving part 213 can be rotated by the user. As a specific embodiment, the driving part 213 includes a knob 2131 and a rotating block 2132, which are integrally formed. As an optional embodiment, the knob and the rotating block can also be fixedly connected, and the fixed connection can be welding, threaded connection, buckling connection, etc. The knob 2131 extends outside the side cover 204 to form a part for the user to directly contact and operate. When the user rotates the knob 2131, the rotating block 2132 will rotate synchronously around the central axis under the action of external force.

[0046] Further, the driving member 213 is arranged on the other side of the casing 20 from the rotary blade 11. The rotary blade 11 is arranged on the side of the casing 20 close to the material to be cut as a high-speed cutting execution component, and the driving member 213 is arranged on the other side of the casing 20 away from the rotary blade 11. The two are indirectly connected through the internal structure of the casing 20, increasing the safety distance between the user's hand and the rotary blade 11, and reducing the risk of accidental contact with the blade during operation.

[0047] The driven member 212 is fixedly connected with the whetstone 211. As a specific embodiment, the driven member 212 includes a support shaft 2121 and a driven push block 2122, and the whetstone 211 is fixedly connected with the driven push block 2122 through the support shaft 2121. The support shaft 2121 has a cylindrical structure, one end of which is fixedly connected with the driven push block 2122 through threaded connection, interference fit or pin fixing, or is integrally formed through injection molding or die casting process, and the other end is firmly combined with the whetstone 211 through a bolt or direct bonding. As an optional embodiment, the support shaft can also have a hollow tubular structure, a polygonal shaft, a stepped shaft or a telescopic shaft composed of an inner shaft and an outer tube.

[0048] The biasing member 214 applies a force to the whetstone 211 to move it from the first position to the second position. As a specific embodiment, the biasing member 214 is an elastic member, which can be a return spring. The elastic member is arranged between the casing 20 and the driven push block 2122 in a direction along the central axis of the driving member 213, one end of the elastic member abuts against the casing 20, and the other end abuts against the driven push block 2122. As an optional embodiment, the biasing member can also be an elastic plastic member, an elastic rubber member or a magnetic member. As a specific embodiment, the biasing member 214 such as a return spring is sleeved on the support shaft 2121, ensuring that the return spring always deforms along the central axis during compression or elongation, avoiding force transmission deviation caused by side bending and twisting, and ensuring that the direction of the force acting on the driven push block 2122 is accurately directed to the second position. As an optional embodiment, the biasing member can also be arranged parallel to the support shaft, or when the support shaft is a hollow telescopic rod, the biasing member is arranged in the cavity of the support shaft.

[0049] Specifically, the rotating block 2132 is provided with a pushing portion 2133, and the driven pushing block 2122 is provided with a pushed portion 2123, the pushing portion 2133 is used to abut against the pushed portion 2123, wherein the pushing portion 2133 and / or the pushed portion 2123 form a slope surface. As a specific embodiment, the slope surface of the pushing portion 2133 extends obliquely towards the side of the driven pushing block 2122, and the slope surface of the pushed portion 2123 extends obliquely towards the side of the rotating block 2132, and the opposite slope surfaces can form complementary contact. The slope surfaces of the pushing portion 2133 and the pushed portion 2123 can adopt a wave-shaped slope surface, such as a continuous shallow arc protrusion and recess. As an alternative embodiment, the slope surfaces of the pushing portion and the pushed portion can also be designed as triangular protrusions and corresponding recesses, oblique tooth-shaped protrusions and corresponding tooth grooves. As an alternative embodiment, the slope surfaces of the pushing portion and the pushed portion can also adopt a stepped slope surface, an arc-shaped slope surface, etc., as long as the slope surfaces of the two are opposite and can form surface contact, and the shape itself is not strictly limited. When in the second position, under the continuous action of the biasing member 214, the driven pushing block 2122 brings the pushed portion 2123 to approach the rotating block 2132, so that the slope surface of the pushing portion 2133 completely matches the slope surface of the pushed portion 2123, realizing close mutual embedding, at this time, the protruding part of the pushing portion 2133 is just embedded in the recessed area of the pushed portion 2123, and there is no gap between the slope surfaces of the two, forming a stable locking state. When the rotating block 2132 rotates around the center axis under the action of an external force, the rotating member drives the pushing portion 2133 to rotate synchronously, and the slope surface of the pushing portion 2133 extrudes the slope surface of the pushed portion 2123 along the circumference to overcome the reverse force of the biasing member 214, and drives the pushed portion 2123 to drive the driven pushing block 2122 to move along the center axis away from the rotating block 2132, and then the whetstone 211 is switched from the second position to the first position. When the external force is removed, the elastic restoring force of the biasing member 214 will push the driven pushing block 2122 to move reversely, and the slope surface of the pushed portion 2123 slides along the slope surface of the pushing portion 2133, until the two again return to the state of mutual embedding, completing the entire reset process.

[0050] Further, the side cover 204 axially limits the driving part 213 along the central axis, preventing the axial displacement of the driving part 213 caused by the force of the biasing part 214. As a specific embodiment, a circular through hole (the hole diameter is slightly larger than the diameter of the knob 2131) is formed in the middle of the side cover 204, one end of the knob 2131 is fixedly connected with the end of the driving part 213, and the other end extends to the outside through the circular through hole of the side cover 204 to form an exposed structure that can be operated by the user. The convex block 2134 is arranged between the rotating block 2132 and the side cover 204 to axially limit the rotating block 2132 along the central axis. The outer periphery of the rotating block 2132 is provided with two symmetrically distributed convex blocks 2134, the convex block 2134 is provided with a right trapezoidal protrusion, and the limiting surface of the convex block 2134 is tightly fitted with the inner side wall of the side cover 204. When the biasing part 214 applies an axial pushing force to the driving part 213 outwardly of the side cover 204, the limiting surface of the convex block 2134 of the driving part 213 abuts against the inner side wall of the side cover 204, and the axial force is directly borne by the structural strength of the side cover 204, thereby preventing the driving part 213 from being displaced outwardly along the central axis.

[0051] Further, the inner side of the side cover 204 is provided with an annular rotating groove 2041 at the position corresponding to the convex block 2134. After assembly, the right trapezoidal convex block 2134 of the rotating block 2132 is embedded in the rotating groove 2041, the limiting surface of the convex block 2134 is tightly fitted with the groove bottom, and the inner side wall of the rotating groove 2041 is provided with two symmetrically distributed arc-shaped stop edges. When the user rotates the knob 2131, the convex block 2134 of the rotating block 2132 rotates in the rotating groove 2041, and when the side edge of the convex block 2134 contacts the arc-shaped stop edge of the rotating groove 2041, the stop edge prevents the convex block 2134 from continuing to rotate by abutting, thereby strictly limiting the rotation angle of the knob 2131 within a predetermined range, and avoiding excessive rotation to cause damage to the internal structure.

[0052] Further, the rotating block 2132 and the side cover 204 are provided with a return spring 22, one end of the return spring 22 is fixed by a pre-set clamping groove, convex column or hook structure on the side cover 204, and the other end is fixed with one of the convex blocks 2134 on the rotating block 2132. When the user rotates the knob 2131, the rotating block 2132 rotates synchronously with the knob 2131 around the central axis, and at this time, the return spring 22 is twisted and deformed due to the fixation of the two ends by the side cover 204 and the rotating block 2132, and stores elastic potential energy. In this state, the return spring 22 applies a reverse torque to the rotating block 2132 in the opposite direction of the rotation direction, and the torque increases with the increase of the rotation angle. When the user removes the external force applied to the knob 2131, the elastic potential energy stored in the return spring 22 is released, the twisted deformation of the return spring 22 gradually recovers, and the reverse torque directly acts on the rotating block 2132 to drive the rotating block 2132 to rotate in the opposite direction of the initial rotation direction until the return spring 22 is completely reset, at this time, the rotating block 2132 drives the knob 2131 to return to the initial position, and the whole reset process is completed.

[0053] Further, the handheld electric scissors 100 further comprises a guide structure for guiding the sliding of the driven member 212 along the central axis of the driving member 213, the sliding of the driven member 212 along the guide structure ensures the stability of the driven member 212 during the axial movement. As a specific embodiment, the guide structure comprises a guide sleeve 23 fixedly connected with the side cover 204, the inner wall of the guide sleeve 23 is provided with a sliding groove 231 along the moving direction of the driven member 212, correspondingly, the outer circumferential surface of the driven push block 2122 is provided with a sliding block 2124 matched with the sliding groove 231, the sliding block 2124 is provided with a hook-shaped protrusion 2125 protruding outward, the guide sleeve 23 is provided with a groove matched with the hook-shaped protrusion 2125 in shape and size, the groove is arranged along the axial direction of the sliding groove 231, the hook-shaped protrusion 2125 is clamped into the groove to make the sliding block 2124 and the sliding groove 231 in sliding connection. When the driven push block 2122 moves along the central axis, the hook-shaped protrusion 2125 is clamped into the groove of the sliding groove 231 along with the sliding block 2124, which not only limits the axial displacement of the sliding block 2124, but also prevents the sliding block 2124 from being accidentally disengaged. As an alternative embodiment, the guide structure can also be at least one sliding rod extending along the central axis direction of the driving member, the sliding rod can be cylindrical or polygonal, and the two ends of the sliding rod are fixedly connected with the main shell and the side cover respectively; correspondingly, the driven push block is provided with a guide hole matched with the sliding rod, and the sliding rod is arranged in the guide hole.

[0054] Further, the number of the sliding blocks 2124 is several, usually two, and these sliding blocks 2124 are uniformly distributed along the circumferential surface of the driven push block 2122 around the central axis, so that the driven push block 2122 can be constrained in multiple directions by the sliding groove 231 during sliding, avoiding the rotation of the driven member 212.

[0055] Further, the support shaft 2121 is in sliding connection with the guide sleeve 23, when the whetstone 211 contacts and grinds the rotary blade 11 at the first position, the guide sleeve 23 limits the radial swing of the support shaft 2121 by cooperating with the support shaft 2121, providing additional radial support for the whetstone 211, offsetting the lateral force generated during grinding, thereby avoiding the whetstone 211 from being offset due to force, affecting the grinding accuracy, and ensuring the stability of the entire grinding process.

[0056] Further, the biasing member 214 is arranged in the guide sleeve 23, one end of the biasing member 214 abuts against the end face of the guide sleeve 23, and the other end of the biasing member 214 abuts against the driven push block 2122, avoiding the lateral bending or twisting of the driven push block 2122 during the extension and retraction process, and ensuring that the elastic force of the biasing member 214 is always transmitted along the central axis direction.

[0057] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0058] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A hand-held electric scissors, characterized in that, The hand-held electric scissors comprise: a rotary blade; a casing; a motor arranged in the casing, the motor driving the rotary blade to rotate; and a grinding assembly for grinding the rotary blade; wherein the grinding assembly comprises: a whetstone having a first position and a second position, the whetstone being in contact with the rotary blade for grinding at the first position, and the whetstone being separated from the rotary blade at the second position; a driven part fixedly connected with the whetstone, the driven part being provided with a pushed part; a driving part capable of being rotated by a user, the driving part being provided with a pushing part for abutting against the pushed part; a biasing part applying a force to the whetstone to move the whetstone from the first position to the second position; wherein the pushing part and / or the pushed part form a slope surface, and when the driving part is rotated around a central axis under an external force, the pushing part presses the pushed part to move the driven part along the central axis from the second position to the first position against the force of the biasing part.

2. The hand-held electric scissors according to claim 1, further comprising a guide structure for guiding the driven part to slide along the central axis, and the driven part slides along the guide structure.

3. The hand-held electric scissors according to claim 2, wherein the guide structure comprises a guide sleeve provided with a sliding groove, the driven part is provided with a sliding block in sliding cooperation with the sliding groove, the sliding block is provided with a hook-shaped protrusion, the sliding groove is provided with a groove matching the hook-shaped protrusion, and the hook-shaped protrusion is clamped into the groove to limit the sliding block, and a plurality of sliding blocks are circumferentially and uniformly distributed around the central axis.

4. The hand-held electric scissors according to claim 2, wherein the guide structure is arranged in the casing, and the driving part partially extends out of the casing, and the casing axially limits the driving part to prevent the driving part from axially moving under the force of the biasing part.

5. The hand-held electric scissors according to claim 1, wherein a return spring is arranged between the driving part and the casing, one end of the return spring is fixed to the casing, and the other end of the return spring is fixed to the driving part, and when the external force is removed, the return spring drives the driving part to automatically reset.

6. The hand-held electric scissors according to claim 1, wherein the pushing part and the pushed part both form a slope surface, the slope surface of the pushing part is arranged towards the driven part, and the slope surface of the pushed part is arranged towards the driving part.

7. The hand-held electric scissors according to claim 6, wherein at the second position, the pushing part and the pushed part are embedded into each other.

8. The hand-held electric scissors according to claim 1, wherein the biasing part is an elastic part, one end of the elastic part abuts against the casing, and the other end of the elastic part abuts against the driven part.

9. The hand-held electric scissors according to claim 8, wherein the biasing part is a return spring, and the return spring is arranged in the guide sleeve. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The driven member comprises a driven push block and a supporting shaft; the reset spring is sleeved on the supporting shaft and abuts against the driven push block.

10. The hand-held electric scissors according to claim 1, wherein, The rotary blade is located at one side of the casing, and the driving member is located at the other side of the casing.

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