Pruning shears

Abstract

The utility model discloses a pruning shears relates to pruning equipment field, including casing, drive assembly and blade subassembly, the blade subassembly includes first blade and second blade, drive assembly includes power source and with power source transmission connection's drive shaft, the drive shaft can drive first blade and second blade relative sliding through around self axial rotation, pruning shears still include adjusting part, adjusting part can be switched between first position and second position through along self axial movement, in first position, adjusting part is separated with drive shaft, in second position, adjusting part is coupled to drive shaft and can drive drive shaft around self axial rotation to drive first blade and second blade relative sliding. The utility model discloses pruning shears is convenient for adjusting blade position to polish the blade.

Description

Technical Field

[0001] This utility model relates to the field of pruning equipment technology, specifically to a pruning shear. Background Technology

[0002] Pruning shears are tools used in landscaping, agriculture, and horticulture to prune the branches or leaves of plants. Their core structure consists of two blades that can slide relative to each other. The cutting motion of the two blades is used to prune the branches to promote healthy plant growth or shape them into a specific form.

[0003] During the use of pruning shears, the blades will wear down after prolonged use, affecting pruning efficiency and service life. Performance needs to be restored through blade sharpening or gap adjustment. However, in related technologies, pruning shears require the blades to be adjusted to the ideal position, which often necessitates disassembly with tools or while the equipment is running, making adjustment inconvenient. Utility Model Content

[0004] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides pruning shears that facilitate blade adjustment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pruning shear includes a housing, a drive assembly, and a blade assembly. The blade assembly includes a first blade and a second blade. The drive assembly includes a power source and a drive shaft driven by the power source. The drive shaft can drive the first blade and the second blade to slide relative to each other by rotating about its own axis. The pruning shear also includes an adjusting member that can switch between a first position and a second position by moving along its own axis. In the first position, the adjusting member is disengaged from the drive shaft. In the second position, the adjusting member is connected to the drive shaft and can drive the drive shaft to rotate about its own axis to drive the first blade and the second blade to slide relative to each other.

[0006] In this application, the adjusting component can switch between a first position and a second position by moving along its own axis. When the adjusting component is in the first position, it is separated from the drive shaft. At this time, the adjusting component cannot drive the drive shaft to rotate, but the power source can drive the drive shaft to rotate. The rotation of the drive shaft drives the first and second blades to slide relative to each other. When the power source is de-energized and stops rotating, the adjusting component can be switched to the second position. When the adjusting component is in the second position, it is connected to the drive shaft and can be manually driven to rotate. When the drive shaft rotates, it drives the first and second blades to slide relative to each other. This allows the first and second blades to be adjusted to the target position by operating the adjusting component, facilitating grinding or gap adjustment of the worn parts of the blades. This application can achieve relative sliding of the first and second blades without running the pruning shears. When the pruning shears are stopped, by adjusting the adjusting component to the second position, the adjusting component can drive the drive shaft to rotate, thereby driving the first and second blades to slide relative to each other. This allows the user to accurately adjust the blades to the ideal position, thereby restoring the cutting efficiency of the blades and extending the service life of the pruning shears. Furthermore, this application allows for adjusting the positions of the first and second blades without requiring disassembly of the equipment using other tools; the adjustment can be achieved simply by operating the adjusting mechanism, making the operation straightforward. In contrast, existing technologies often require disassembly of the equipment using tools for this type of maintenance, making the operation complex and time-consuming.

[0007] Optionally, the adjusting member includes a connecting rod and an operating part fixed to the end of the connecting rod away from the drive shaft. The drive shaft has a slot at the end near the connecting rod. When the adjusting member is in the second position, the connecting rod is inserted into the slot.

[0008] The operating section provides users with easy-to-use contact points. When it is necessary to switch the adjustment component to the second position to drive the blade assembly, the user only needs to apply force to the operating section to push the connecting rod into the slot of the drive shaft, thus connecting the drive shaft and the adjustment component, reducing the difficulty of operation. The cooperation between the connecting rod and the slot ensures a stable connection between the adjustment component and the drive shaft, preventing the adjustment component from failing to drive the drive shaft to rotate due to a loose connection. In addition, the adjustment component has a simple and compact structure, reducing the number of parts and lowering manufacturing costs.

[0009] Optionally, the slot is shaped as a semi-circular slot, a spline slot, or a rectangular slot, and the portion of the connecting rod inserted into the slot matches the shape of the slot so that the connecting rod can drive the drive shaft to rotate around its own axis when it rotates.

[0010] The slot in this application can be a non-circular slot such as a semi-circular slot, spline slot, or rectangular slot. The shape of the part of the connecting rod that is inserted into the slot matches the shape of the slot, that is, the shape of the part of the connecting rod that is inserted into the slot is also non-circular. When the connecting rod rotates, the connecting rod will apply a tangential force to the side wall of the slot, thereby generating torque to drive the drive shaft to rotate.

[0011] Optionally, a return spring is provided between the adjusting member and the housing, the return spring enabling the adjusting member to maintain its tendency to move from the second position to the first position.

[0012] The return spring tends to move the adjusting member from the second position to the first position, that is, it tends to separate the adjusting member from the drive shaft. When the user does not apply force to the operating part, the return spring will automatically separate the adjusting member from the drive shaft. In addition, the return spring also generates resistance to the adjusting member approaching the drive shaft, thus preventing the adjusting member from arbitrarily engaging with the drive shaft.

[0013] Optionally, the return spring is sleeved on the connecting rod, with one end of the return spring abutting against the surface of the housing and the other end abutting against the side of the operating part near the connecting rod.

[0014] A return spring is sleeved on the connecting rod to ensure that it always extends and retracts along the axis of the connecting rod during movement, preventing deviation and ensuring the stability of the return spring's operation. The return spring is sleeved on the connecting rod to fully utilize the space around it, making the overall structure more compact. One end of the return spring abuts against the surface of the housing, and the other end abuts against the side of the operating part closest to the connecting rod, allowing the return spring to push the operating part away from the drive shaft.

[0015] Optionally, the drive assembly includes a cam, a first link, and a second link. The cam is connected to the drive shaft, and the drive shaft drives the cam to rotate. The cam includes a first protrusion and a second protrusion arranged vertically. The first protrusion and the second protrusion are symmetrically arranged on both sides of the drive shaft. One end of the first link is rotatably connected to the first protrusion, and the other end is rotatably connected to the first blade. One end of the second link is rotatably connected to the second protrusion, and the other end is rotatably connected to the second blade.

[0016] The cam has symmetrically arranged first and second protrusions, one above the other. These protrusions are converted into reciprocating linear motions in opposite directions by a first and second connecting rod, allowing the blades to slide relative to each other to complete the shearing process. This mechanism is compact and facilitates adjustment of the first and second blades to the target position.

[0017] Optionally, the first protrusion and the second protrusion partially overlap, and the overlapping portion of the first protrusion and the second protrusion is provided with a mounting hole, and the drive shaft passes through the mounting hole.

[0018] A mounting hole is provided through the overlapping part, through which the drive shaft passes, so that the drive shaft can drive the first cam and the second cam at the same time, which improves the coaxiality of the drive shaft and the cam and ensures the stability and reliability of the entire drive assembly.

[0019] Optionally, the drive shaft has flat sections formed on both sides, and the mounting hole is constructed as a flat hole adapted to the flat sections.

[0020] Flat sections are provided on both sides of the drive shaft, and the mounting holes are constructed to fit these flat holes, enabling precise positioning of the drive shaft when installed into the cam mounting holes. The fit between the flat sections and the flat holes prevents relative rotation between the drive shaft and the cam in the circumferential direction, ensuring that the drive shaft rotates synchronously with the first and second cams, thus improving the accuracy of power transmission.

[0021] Optionally, the first connecting rod has a first circular hole at one end near the first protrusion, and the second connecting rod has a second circular hole at one end near the second protrusion. Both the first protrusion and the second protrusion are cylindrical. The first protrusion is installed in the first circular hole through a first bearing, and the second protrusion is installed in the second circular hole through a second bearing.

[0022] The first protrusion is installed in the first circular hole through the first bearing, and the second protrusion is installed in the second circular hole through the second bearing. This makes the rotational connection between the first connecting rod and the first protrusion, and between the second connecting rod and the second protrusion more flexible, reduces the frictional resistance during rotation, reduces energy loss, and allows the connecting rod to swing smoothly with the rotation of the protrusion.

[0023] Optionally, the drive assembly further includes a motor, the output shaft of which is connected to the drive shaft.

[0024] The motor's output shaft connects to the drive shaft and transmits power to it, thereby controlling the speed of the blade movement. In production scenarios requiring different speeds, the motor speed can be flexibly adjusted according to actual needs to meet diverse production requirements.

[0025] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the pruning shears in this utility model; Figure 2 This is a cross-sectional view of the pruning shears in this utility model; Figure 3 This is a partial structural diagram of the pruning shears in this utility model; Figure 4 This is an exploded view of the pruning shears in this utility model; Figure 5 This is a schematic diagram showing the cooperation of the cam, the first connecting rod, the second connecting rod, and the drive shaft in this utility model; Figure 6 This is a schematic diagram of another structure of the slot in this utility model; Figure 7 This is another structural schematic diagram of the slot in this utility model; Figure 8 This is a schematic diagram of another structure of the slot in this utility model.

[0027] The components include: 1. Housing; 2. Drive assembly; 21. Drive shaft; 211. Slot; 212. Flat part; 22. Cam; 221. First protrusion; 222. Second protrusion; 223. Mounting hole; 23. First connecting rod; 231. First round hole; 24. Second connecting rod; 241. Second round hole; 25. First bearing; 26. Second bearing; 3. Return spring; 4. Blade assembly; 41. First blade; 42. Second blade; 5. Adjusting component; 51. Connecting rod; 52. Operating part. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0029] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0030] Example: like Figures 1 to 4As shown, a pruning shear includes a housing 1, a drive assembly 2, and a blade assembly 4. The blade assembly 4 includes a first blade 41 and a second blade 42. The drive assembly 2 includes a power source and a drive shaft 21 that is connected to the power source. The drive shaft 21 can drive the first blade 41 and the second blade 42 to slide relative to each other by rotating about its own axis. The pruning shear also includes an adjustment member 5, which can switch between a first position and a second position by moving along its own axis. In the first position, the adjustment member 5 is separated from the drive shaft 21. In the second position, the adjustment member 5 is connected to the drive shaft 21 and can drive the drive shaft 21 to rotate about its own axis to drive the first blade 41 and the second blade 42 to slide relative to each other.

[0031] In this embodiment, the drive assembly 2 is disposed within the housing 1, and the blade assembly 4 is partially disposed within the housing 1, with the remaining portion protruding from the housing 1 to achieve the purpose of pruning plants. The operator can manually press the adjusting member 5 to move it from a first position to a second position. When the adjusting member 5 is in the second position, it is connected to the drive shaft 21 and can drive the drive shaft 21 to rotate. The rotation of the drive shaft 21 drives the first blade 41 and the second blade 42 to slide relative to each other. This allows the first blade 41 and the second blade 42 to be adjusted to the target position by operating the adjusting member 5, facilitating grinding or gap adjustment of the worn areas of the blades. Specifically, manually rotating the adjusting member 5 rotates the drive shaft 21 connected to it, thereby enabling manual adjustment of the blade assembly 4. This allows the first blade 41 and the second blade 42 to be adjusted to a suitable position for grinding, providing convenience for subsequent blade grinding. The blade assembly 4 can be fine-tuned to the appropriate position without disassembling it. In other embodiments, the position of the adjusting member 5 can also be adjusted in other ways, such as by installing an electric push rod near the adjusting member 5, with the telescopic end of the electric push rod connected to the connecting rod 51 through a connecting structure such as a hinge.

[0032] The adjusting member 5 includes a connecting rod 51 and an operating part 52 fixed to the end of the connecting rod 51 away from the drive shaft 21. The drive shaft 21 has a slot 211 at the end near the connecting rod 51. When the adjusting member 5 is in the second position, the connecting rod 51 is inserted into the slot 211.

[0033] In this embodiment, the connecting rod 51 is elongated, with one end fixedly connected to the operating part 52 and the other end inserted into the slot 211 of the drive shaft 21. The operating part 52 is fixed to the end of the connecting rod 51 away from the drive shaft 21, providing the operator with a direct contact point for operation. The operator controls the movement of the connecting rod 51 by applying force to the operating part 52, thereby adjusting the position of the adjusting member 5. The drive shaft 21 has an overall shaft structure, with a slot 211 at its end near the connecting rod 51. The shape and size of the slot 211 are adapted to the end of the connecting rod 51 so that the connecting rod 51 can be inserted into it, realizing the connection and interaction between the two. In addition, the radial width of the operating part 52 is greater than the radial width of the connecting rod 51.

[0034] like Figure 3 , Figure 6 , Figure 7 as well as Figure 8 As shown, the slot 211 is shaped like a semi-circular slot, a spline slot, or a rectangular slot. The part of the connecting rod 51 that is inserted into the slot 211 matches the shape of the slot 211 so that when the connecting rod 51 rotates, it can drive the drive shaft 21 to rotate around its own axis.

[0035] In this embodiment, the slot 211 is a rectangular groove. In other embodiments, the slot 211 can also be a non-circular groove such as a semi-circular groove or a spline groove. When the slot 211 is a circular groove, there is no relative force restricting the direction of rotation between the circular groove and the part of the connecting rod 51 that is inserted into the slot 211 (which is also circular). When the connecting rod 51 rotates, the inner wall of the circular groove and the surface of the connecting rod 51 are in contact everywhere in the circumferential direction and are subjected to uniform force, which cannot form an effective torque transmission, that is, it cannot drive the drive shaft 21 to rotate. Therefore, the slot 211 needs to be constructed as a non-circular groove.

[0036] A return spring 3 is provided between the adjusting member 5 and the housing 1. The return spring 3 can keep the adjusting member 5 moving from the second position to the first position.

[0037] In this embodiment, the housing 1 provides installation space for the adjusting member 5, drive shaft 21, and other components, ensuring the stability of the relative positions and movement relationships between the components. The return spring 3 is typically a helical spring with a certain elastic coefficient and extension capacity, and it is installed between the adjusting member 5 and the housing 1 to achieve the automatic reset function of the adjusting member 5. The return spring 3 causes the adjusting member 5 to tend to move from the second position to the first position, that is, the return spring 3 causes the adjusting member 5 to tend to separate from the drive shaft 21. When the user does not apply force to the operating part 52, the return spring 3 will cause the adjusting member 5 to automatically separate from the drive shaft 21.

[0038] The return spring 3 is sleeved on the connecting rod 51, with one end of the return spring 3 abutting against the surface of the housing 1 and the other end abutting against the side of the operating part 52 near the connecting rod 51.

[0039] The return spring 3 is sleeved on the connecting rod 51, which provides stable axial support for the return spring 3. This ensures that the return spring 3 can only move along the axial direction of the connecting rod 51 during compression or extension, preventing radial offset or twisting of the spring under force, thus ensuring the stability and reliability of the spring's operation. One end of the return spring 3 abuts against the surface of the housing 1, and the other end abuts against the side of the operating part 52 near the connecting rod 51, allowing the return spring 3 to effectively transmit the elastic restoring force to the adjusting member 5, thereby achieving the reset of the adjusting member 5.

[0040] like Figure 4 and Figure 5 As shown, the drive assembly 2 includes a cam 22, a first connecting rod 23, and a second connecting rod 24. The cam 22 is connected to the drive shaft 21, and the drive shaft 21 drives the cam 22 to rotate. The cam 22 includes a first protrusion 221 and a second protrusion 222 arranged vertically. The first protrusion 221 and the second protrusion 222 are symmetrically arranged on both sides of the drive shaft 21. One end of the first connecting rod 23 is rotatably connected to the first protrusion 221, and the other end is rotatably connected to the first blade 41. One end of the second connecting rod 24 is rotatably connected to the second protrusion 222, and the other end is rotatably connected to the second blade 42.

[0041] In this embodiment, the first protrusion 221 is rotatably connected to one end of the first connecting rod 23, and the second protrusion 222 is rotatably connected to one end of the second connecting rod 24. When the drive shaft 21 drives the cam 22 to rotate, the first protrusion 221 pushes one end of the first connecting rod 23 to perform a circular motion. Since the other end of the first connecting rod 23 is connected to the first blade 41, and the first connecting rod 23 is restricted in the length direction, the first connecting rod 23 can only convert the circular motion into a reciprocating linear motion along the length direction of the first blade 41. Similarly, the second protrusion 222 also drives the second blade 42 to perform a reciprocating linear motion through the second connecting rod 24. In addition, the first protrusion 221 and the second protrusion 222 are symmetrically arranged on both sides of the drive shaft 21, that is, during the rotation of the cam 22, the direction of the force exerted by the first protrusion 221 on the first connecting rod 23 is always opposite to the direction of the force exerted by the second protrusion 222 on the second connecting rod 24. Because the directions of the forces are opposite, the directions of motion of the first connecting rod 23 and the second connecting rod 24 are also always opposite. The first protrusion 221 drives the first blade 41 to reciprocate in one direction via the first connecting rod 23, while the second protrusion 222 drives the second blade 42 to reciprocate in the opposite direction via the second connecting rod 24. The first protrusion 221 and the second protrusion 222 are arranged vertically, that is, the first blade 41 connected to the first protrusion 221 and the second blade 42 connected to the second protrusion 222 are also arranged vertically. The vertically arranged first blade 41 and second blade 42 slide relative to each other to complete the shearing action.

[0042] The first protrusion 221 and the second protrusion 222 partially overlap, and the overlapping part of the first protrusion 221 and the second protrusion 222 is provided with a mounting hole 223, and the drive shaft 21 passes through the mounting hole 223.

[0043] In this embodiment, a mounting hole 223 is provided through the overlapping portion of the first protrusion 221 and the second protrusion 222. The diameter and shape of the mounting hole 223 match the drive shaft 21. When the drive shaft 21 rotates, the rotational motion of the drive shaft 21 can be directly transmitted to the first protrusion 221 and the second protrusion 222 through the mounting hole 223. The first protrusion 221 and the second protrusion 222 then transmit the power to the first blade 41 and the second blade 42 connected to them, realizing the transmission and conversion of power.

[0044] The drive shaft 21 has flat sections 212 on both sides, and the mounting holes 223 are constructed to fit the flat sections 212.

[0045] In this embodiment, the flat sections 212 formed on both sides of the drive shaft 21 are created by flattening the original circular cross-section of the drive shaft 21 to form a planar region with a certain width and length. The flat sections 212 provide a non-circular cross-section for the drive shaft 21, enabling torque transmission between the drive shaft 21 and the mounting hole 223 during rotation, while restricting the relative rotation of the drive shaft 21 within the mounting hole 223, thus ensuring the synchronous movement of the drive shaft 21 and the cam 22.

[0046] The first connecting rod 23 has a first circular hole 231 at one end near the first protrusion 221, and the second connecting rod 24 has a second circular hole 241 at one end near the second protrusion 222. Both the first protrusion 221 and the second protrusion 222 are cylindrical. The first protrusion 221 is installed in the first circular hole 231 through the first bearing 25, and the second protrusion 222 is installed in the second circular hole 241 through the second bearing 26.

[0047] In this embodiment, the first connecting rod 23 and the second connecting rod 24 serve to connect and transmit force. The first protrusion 221 and the second protrusion 222 are cylindrical. The first circular hole 231 and the second circular hole 241 are respectively opened at the end of the first connecting rod 23 near the first protrusion 221 and the end of the second connecting rod 24 near the second protrusion 222. The first bearing 25 is used to install the first protrusion 221 into the first circular hole 231, and the second bearing 26 is used to install the second protrusion 222 into the second circular hole 241 to achieve a rotatable connection. The first protrusion 221 is installed in the first circular hole 231 through the first bearing 25, and the second protrusion 222 is installed in the second circular hole 241 through the second bearing 26. The bearings allow the protrusions to rotate smoothly relative to the connecting rods within the circular holes, reducing friction during rotation and improving the flexibility of the connection.

[0048] Drive assembly 2 also includes a motor, the output shaft of which is connected to drive shaft 21.

[0049] In this embodiment, the drive assembly 2 includes a gearbox, with the drive shaft 21 housed within it. The motor's output shaft is connected to the drive shaft 21 via a bevel gear to achieve transmission. A gearbox is a mechanical transmission device composed of multiple gears, shafts, bearings, and a housing, primarily used to change the motor's speed, torque, and direction of rotation. In other embodiments, the motor can also be connected to the drive shaft 21 in other ways, as long as the rotation of the drive shaft 21 is achieved; further details are omitted here.

[0050] When the user needs to maintain the blade assembly 4, the user first turns off the pruning shears, then presses the operating part 52 to move the connecting rod 51 downwards until the connecting rod 51 is inserted into the slot 211 on the drive shaft 21. Then, the user rotates the operating part 52 to make the connecting rod 51 drive the drive shaft 21 to rotate. The drive shaft 21 drives the first connecting rod 23 and the second connecting rod 24 to swing through the cam 22, so that the first blade 41 and the second blade 42 slide relative to each other, which facilitates the user to grind the blade assembly 4. When the blade assembly 4 is adjusted to the ideal position, the user releases the operating part 52. The operating part 52 moves upwards under the action of the return spring 3, so that the connecting rod 51 is separated from the drive shaft 21. This prevents the operating part 52 from being accidentally touched and causing the position of the blade assembly 4 to change, so that the user can grind the cutting edge. It also prevents the adjusting part 5 from interfering with the subsequent movement of the drive shaft 21.

[0051] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A pruning shears, comprising a housing (1), a drive assembly (2), and a blade assembly (4), said blade assembly (4) comprising a first blade (41) and a second blade (42), characterized in that, The drive assembly (2) includes a power source and a drive shaft (21) connected to the power source. The drive shaft (21) can drive the first blade (41) and the second blade (42) to slide relative to each other by rotating about its own axis. The pruning shears also include an adjustment member (5). The adjustment member (5) can switch between a first position and a second position by moving along its own axis. In the first position, the adjustment member (5) is separated from the drive shaft (21). In the second position, the adjustment member (5) is connected to the drive shaft (21) and can drive the drive shaft (21) to rotate about its own axis to drive the first blade (41) and the second blade (42) to slide relative to each other.

2. The pruning shears according to claim 1, characterized in that, The adjusting member (5) includes a connecting rod (51) and an operating part (52) fixed to one end of the connecting rod (51) away from the drive shaft (21). The drive shaft (21) has a slot (211) at one end near the connecting rod (51). When the adjusting member (5) is in the second position, the connecting rod (51) is inserted into the slot (211).

3. A pruning shears according to claim 2, characterized in that, The slot (211) is shaped like a semi-circular slot, a spline slot, or a rectangular slot. The part of the connecting rod (51) inserted into the slot (211) matches the shape of the slot (211) so that when the connecting rod (51) rotates, it can drive the drive shaft (21) to rotate around its own axis.

4. A pruning shears according to claim 2, characterized in that, A return spring (3) is provided between the adjusting member (5) and the housing (1), and the return spring (3) enables the adjusting member (5) to maintain the tendency to move from the second position to the first position.

5. A pruning shears according to claim 4, characterized in that, The reset spring (3) is sleeved on the connecting rod (51), and one end of the reset spring (3) abuts against the surface of the housing (1), and the other end abuts against the side of the operating part (52) near the connecting rod (51).

6. A pruning shears according to any one of claims 1-5, characterized in that, The drive assembly (2) includes a cam (22), a first connecting rod (23), and a second connecting rod (24). The cam (22) is connected to the drive shaft (21), and the drive shaft (21) drives the cam (22) to rotate. The cam (22) includes a first protrusion (221) and a second protrusion (222) arranged vertically. The first protrusion (221) and the second protrusion (222) are symmetrically arranged on both sides of the drive shaft (21). One end of the first connecting rod (23) is rotatably connected to the first protrusion (221), and the other end is rotatably connected to the first blade (41). One end of the second connecting rod (24) is rotatably connected to the second protrusion (222), and the other end is rotatably connected to the second blade (42).

7. A pruning shears according to claim 6, characterized in that, The first protrusion (221) partially overlaps with the second protrusion (222), and a mounting hole (223) is provided through the overlapping part of the first protrusion (221) and the second protrusion (222), and the drive shaft (21) passes through the mounting hole (223).

8. A pruning shears according to claim 7, characterized in that, The drive shaft (21) has flat sections (212) formed on both sides, and the mounting hole (223) is constructed as a flat hole adapted to the flat sections (212).

9. A pruning shears according to claim 6, characterized in that, The first connecting rod (23) has a first circular hole (231) at one end near the first protrusion (221), and the second connecting rod (24) has a second circular hole (241) at one end near the second protrusion (222). Both the first protrusion (221) and the second protrusion (222) are cylindrical. The first protrusion (221) is installed in the first circular hole (231) through the first bearing (25), and the second protrusion (222) is installed in the second circular hole (241) through the second bearing (26).

10. A pruning shears according to claim 1, characterized in that, The drive assembly (2) also includes a motor, the output shaft of which is connected to the drive shaft (21).

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