Adjustable pruning shears

Abstract

The invention discloses a pair of adjustable pruning shears, belongs to the field of pruning shears, solves the problem that a blade assembly is inconvenient to grind, and adopts the technical scheme that the adjustable pruning shears mainly comprise a machine shell, the blade assembly and a driving device, the blade assembly comprises a first blade and a second blade, and the driving device comprises a driving motor and a cam mechanism; the driving motor drives the first blade and the second blade to slide relatively through the cam mechanism, the machine shell is further provided with a limiter and an adjusting mechanism, and the adjusting mechanism comprises an operation part, a first reset piece and a connecting part which can be in transmission connection with the cam mechanism. The operating part controls the connecting part to be in transmission connection with the cam mechanism so as to drive the first blade and the second blade to slide relatively, the first reset piece enables the connecting part to have the movement trend of being separated from the cam mechanism, and the limiter limits the connecting part and the cam mechanism to be in transmission connection in the starting state of the driving motor. The blade assembly can be manually and finely adjusted, and the cutting edge can be conveniently ground.

Description

Technical Field

[0001] The invention discloses an adjustable pruning shear, and belongs to the technical field of pruning shears. Background Art

[0002] Pruning shears are commonly used tools in gardening operations. The blade assembly of the pruning shears is composed of two blades that can slide relative to each other. During the operation of the pruning shears, the two blades slide relative to each other so that the cutting edges of the two blades are misaligned to achieve shearing. After long-term use, the cutting edges of the blades will gradually become blunt, which will affect the shearing effect of the pruning shears. Therefore, the cutting edges need to be sharpened to maintain the sharpness of the cutting edges. However, after the existing pruning shears are stopped, the relative positions of the two blades are completely random and uncontrollable, and the user cannot manually adjust the blade assembly after the pruning shears are stopped. Therefore, in most cases, the two blades will affect each other and make it difficult for the user to grind the cutting edges. In addition, when the blade assembly needs to be replaced, the two blades need to be moved to a specific position. Since the relative positions of the two blades of the pruning shears after the shutdown are completely random and uncontrollable, the position of the blade needs to be moved manually. If the blade is directly touched by hand, the possibility of being scratched is greater. If the user's hand directly touches the connecting rod at the root of the blade, it is easy to be stained with oil, which is inconvenient to clean and reduces the replacement efficiency of the blade assembly. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of inconvenient grinding of blade components, and to this end provides an adjustable pruning shears, after the pruning shears are stopped, the user can manually fine-tune the blade component to make the position of the cutting edge easier to grind.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An adjustable pruning shear comprises a casing, a blade assembly and a driving device, wherein the blade assembly comprises a first blade and a second blade which can slide relative to each other, the driving device comprises a driving motor and a cam mechanism, the driving motor drives the first blade and the second blade to slide relative to each other through the cam mechanism, the casing is also provided with a limiter and an adjusting mechanism, the adjusting mechanism comprises an operating part, a first reset member and a connecting part which can be transmission-connected to the cam mechanism, the operating part controls the connecting part to be transmission-connected to the cam mechanism to drive the first blade and the second blade to slide relative to each other, the first reset member enables the connecting part to have a movement tendency to separate from the cam mechanism, and the limiter limits the transmission connection between the connecting part and the cam mechanism when the driving motor is started.

[0006] The beneficial effects of adopting the present invention are:

[0007] In the present invention, a restrictor and an adjustment mechanism are provided inside the housing. The adjustment mechanism includes an operation part, a first reset member, and a connection part. When a user needs to grind the cutting edge, the user can control the movement of the connection part through the operation part so that the connection part is in driving connection with the cam mechanism. At this time, the user can drive the first blade and the second blade to slide relative to each other through the connection part to realize the manual adjustment of the blade assembly, so that the cutting edges of the first blade and the second blade can be finely adjusted to a position suitable for grinding, which provides convenience for the user to grind the cutting edge subsequently. Without disassembling the blade assembly, the cutting edge can be finely adjusted to a suitable position, making the adjustment of the blade assembly more free and convenient, which helps to improve the working efficiency of the user in grinding the cutting edge. In addition, the first reset member makes the connection part have a tendency to separate from the cam mechanism. Therefore, when the user releases the force on the operation part, the first reset member will automatically separate the connection part from the cam mechanism. At the same time, the first reset member will also generate resistance to the driving connection between the connection part and the cam mechanism. Therefore, it can effectively prevent the connection part from randomly engaging with the cam mechanism, avoid the adjustment mechanism from affecting the normal operation of the driving motor and the cam mechanism, and reduce the possibility of damage to the driving motor and the cam mechanism. Secondly, when the driving motor is in the starting state, the restrictor can restrict the driving connection between the connection part and the cam mechanism. Since when the driving motor is in the starting state, the output end of the driving motor drives the cam mechanism to rotate so that the blade assembly performs shearing. During the rotation of the cam mechanism, if the connection part engages with the cam mechanism, the connection part will interfere with the rotation of the cam mechanism, causing a relatively strong impact between the connection part and the cam mechanism, which is likely to cause damage to the connection part and the cam mechanism. The restrictor can prevent the user from manually operating the adjustment mechanism during the movement of the pruning shear and making the connection part engage with the cam mechanism, avoiding misoperation by the user, and thus can protect the connection part and the cam mechanism, reduce the possibility of damage caused by the impact between the connection part and the cam mechanism, and improve the safety of using the pruning shear. In addition, when the blade assembly needs to be replaced, the connection part is controlled to engage with the cam mechanism through the operation part. Then, the user can manually finely adjust the blade assembly through the operation part to adjust the relative position of the first blade and the second blade to a detachable position, and then the disassembly of the blade assembly can be quickly completed, which helps to improve the disassembly efficiency of the blade assembly. At the same time, it can also prevent the user from directly touching the blade assembly with hands, reduce the possibility of the user being scratched by the blade, and improve the safety of use.

[0008] Preferably, the housing is provided with a through hole for the adjustment mechanism to pass through. The adjustment mechanism is rotationally matched with the housing through the through hole. The operation part is exposed outside the housing. The adjustment mechanism slides along the through hole to make the connection part in driving connection with or separated from the cam mechanism. The first reset member is restricted between the housing and the operation part.

[0009] Preferably, the adjusting mechanism further includes a connecting shaft. A guiding hole adapted to the connecting shaft is provided in the casing. One end of the connecting shaft is fixedly connected to the operating part, and the other end is at least partially located in the guiding hole. The connecting part is fixedly connected to the part of the connecting shaft located in the casing. With the foregoing technical solution, the adaptation between the connecting shaft and the guiding hole can ensure the accurate movement track of the connecting shaft in the casing, and further ensure that the connecting part can be stably engaged with the cam mechanism. In addition, the guiding hole can also guide the movement of the connecting shaft to make the sliding of the connecting shaft smoother and reduce the possibility of the connecting shaft getting stuck.

[0010] Preferably, a buffer pad is provided on the bottom wall around the through hole. The first reset member drives the connecting part to separate from the cam mechanism and abut against the buffer pad. With the foregoing technical solution, the buffer pad can reduce the impact force between the connecting part and the casing, effectively prevent the connecting part from being misaligned or damaged due to long-term impact, and help extend the service life of the connecting part.

[0011] Preferably, the limiter includes a driver and a limiting block. The limiting block has a first position and a second position. When the limiting block is in the first position, the limiting block is on the movement path of the connecting part to limit the transmission connection between the connecting part and the cam mechanism. When the limiting block is in the second position, the limiting block is away from the connecting part to release the restriction on the connecting part. With the foregoing technical solution, when the limiting block is in the first position, the limiting block blocks the movement path of the connecting part, and thus can prevent the movement of the connecting part and limit the engagement between the connecting part and the cam mechanism. Therefore, the limiter can effectively prevent the possibility of the connecting part and the cam mechanism being mis-engaged and can protect the connecting part and the cam mechanism.

[0012] Preferably, the driver includes an electromagnetic valve and an armature shaft. The limiting block is fixed to one end of the armature shaft away from the electromagnetic valve. A second reset member is arranged on the armature shaft. When the electromagnetic valve is energized, it adsorbs the armature shaft to make the limiting block away from the connecting part and reach the second position. When the electromagnetic valve is de-energized, the second reset member acts on the armature shaft to make the limiting block reach the first position. With the foregoing technical solution, by energizing and de-energizing the electromagnetic valve, the position of the limiting block can be accurately controlled, so as to realize the reliable restriction and contact of the transmission connection between the connecting part and the cam mechanism. In addition, as a control element, the electromagnetic valve has the characteristics of fast response speed and high control precision, ensuring that the limiting block can quickly and accurately cut into or out of the movement path of the connecting part.

[0013] Preferably, the casing is further provided with a control mechanism. The control mechanism includes a control panel and a control switch. The control switch is connected in series between the control panel and the electromagnetic valve. During the operation of the driving motor, the control panel cuts off the electrical connection with the electromagnetic valve, and the control switch controls the on-off of the electromagnetic valve after the driving motor stops.

[0014] Preferably, the cam mechanism includes a first gear rotatably disposed within the housing. The output end of the drive motor is provided with a second gear that is in transmission connection with the first gear. The outer peripheral side of the connecting portion is provided with a tooth portion that meshes with the first gear.

[0015] Preferably, the outer surface of the housing is provided with a groove, and the top surface of the operating portion is not higher than the notch of the groove. With the foregoing technical solution, the top surface of the operating portion not being higher than the notch of the groove can effectively reduce the direct contact between the operating portion and external objects, thereby reducing the risk of damage to the operating portion caused by impacts, friction, etc.; in addition, it can also reduce the possibility of the operating portion being misoperated, which helps to improve the safety of use of the pruning shear.

[0016] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings:

[0018] Figure 1 is an exploded view of an adjustable pruning shear of the present invention;

[0019] Figure 2 is a structural schematic diagram of an adjustable pruning shear of the present invention;

[0020] Figure 3 is Figure 2 a partial enlarged view of part A in

[0021] Figure 4 is a cross-sectional view of an adjustable pruning shear of the present invention;

[0022] Figure 5 is Figure 4 a partial enlarged view of part B in

[0023] Figure 6 is a cross-sectional view of a limiter in an adjustable pruning shear of the present invention;

[0024] Figure 7 is a structural schematic diagram of a grinding edge in an adjustable pruning shear of the present invention.

[0025] Reference numerals: 1, housing; 11, through hole; 12, guiding hole; 13, groove; 14, buffer pad; 2, cam mechanism; 21, first gear; 211, convex block; 22, connecting rod; 3, blade assembly; 31, first blade; 32, second blade; 4, adjusting mechanism; 41, operating part; 42, connecting part; 43, first reset member; 44, connecting shaft; 5, restrictor; 51, solenoid valve; 52, armature shaft; 521, positioning projection; 53, second reset member; 54, limiting block; 551, housing; 552, end cap; 553, fixing plate; 61, control panel; 62, drive motor; 621, second gear; 63, control switch. Detailed implementation manners

[0026] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in the implementation manners without creative efforts fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0028] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected with", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 situations.

[0029] Embodiment 1:

[0030] As Figures 1 to 7As shown in the figure, this embodiment discloses an adjustable pruning shear, which includes a housing 1, a blade assembly 3 and a driving device. The blade assembly 3 includes a first blade 31 and a second blade 32. The first blade 31 and the second blade 32 are attached to each other and can slide relative to each other. The driving device includes a driving motor 62 and a cam mechanism 2. The cam mechanism 2 includes a first gear 21 rotatably installed in the housing 1 and two connecting rods 22 respectively connected to the first blade 31 and the second blade 32. The output shaft of the driving motor 62 is provided with a second gear 621 that remains engaged with the first gear 21. After the driving motor 62 is started, the first gear 21 is driven to rotate by the second gear 621. Both the upper and lower sides of the first gear 21 are provided with bumps 211. The bumps 211 are eccentrically arranged relative to the first gear 21, and the two bumps 211 are centrosymmetrically arranged relative to the central axis of the first gear 21. One end of the connecting rod 22 is rotatably connected to the bump 211, and the other end is rotatably connected to the first blade 31 or the second blade 32. As the first gear 21 rotates, the connecting rod 22 drives the first blade 31 and the second blade 32 to approach or move away from the first gear 21, that is, the first blade 31 and the second blade 32 perform reciprocating motion along the length direction of the blade assembly 3. Since the eccentric positions of the two bumps 211 are different and are centrosymmetrically arranged relative to the central axis of the first gear 21, the moving directions of the first blade 31 and the second blade 32 are opposite, so that the cutting edges of the first blade 31 and the second blade 32 can reciprocally approach and separate, thereby achieving the cutting effect.

[0031] As Figure 1 shown in the figure, in this embodiment, the housing 1 is further provided with a limiter 5 and an adjusting mechanism 4. The adjusting mechanism 4 includes an operating part 41, a first reset member 43 and a connecting part 42 that can be in transmission connection with the cam mechanism 2. The operating part 41 controls the connecting part 42 to be in transmission connection with the cam mechanism 2 to drive the relative sliding of the first blade 31 and the second blade 32. The first reset member 43 enables the connecting part 42 to have a tendency to move away from the cam mechanism 2. The limiter 5 restricts the connecting part 42 and the cam mechanism 2 from being in transmission connection when the driving motor 62 is in the starting state.

[0032] In this embodiment, a controller 5 and an adjusting mechanism 4 are provided inside the housing 1. The adjusting mechanism 4 includes an operating part 41, a first reset part 43 and a connecting part 42. When the user needs to grind the blade edge, the user can control the movement of the connecting part 42 through the operating part 41 to enable the connecting part 42 to be in transmission connection with the cam mechanism 2. At this time, the user can drive the first blade 31 and the second blade 32 to slide relative to each other through the connecting part 42 to achieve manual adjustment of the blade assembly 3, so that the blade edges of the first blade 31 and the second blade 32 can be finely adjusted to a position suitable for grinding, which provides convenience for the user to grind the blade edge subsequently. Without disassembling the blade assembly 3, the blade edge can be finely adjusted to a suitable position, making the adjustment of the blade assembly 3 more free and convenient, which helps to improve the working efficiency of the user in grinding the blade edge; in addition, the first reset part 43 makes the connecting part 42 have a tendency to move away from the cam mechanism 2. Therefore, when the user releases the force on the operating part 41, the first reset part 43 will cause the connecting part 42 to automatically separate from the cam mechanism 2. At the same time, the first reset part 43 will also generate resistance to the transmission connection between the connecting part 42 and the cam mechanism 2. Therefore, it can effectively prevent the connecting part 42 from being randomly engaged with the cam mechanism 2, avoid the adjusting mechanism 4 from affecting the normal operation of the drive motor 62 and the cam mechanism 2, and reduce the possibility of damage to the drive motor 62 and the cam mechanism 2; secondly, the restrictor 5 can restrict the transmission connection between the connecting part 42 and the cam mechanism 2 when the drive motor 62 is in the starting state. Since when the drive motor 62 is in the starting state, the output end of the drive motor 62 drives the cam mechanism 2 to rotate to enable the blade assembly 3 to perform shearing. During the rotation of the cam mechanism 2, if the connecting part 42 is engaged with the cam mechanism 2, the connecting part 42 will interfere with the rotation of the cam mechanism 2, resulting in a relatively strong impact between the connecting part 42 and the cam mechanism 2, which is likely to cause damage to the connecting part 42 and the cam mechanism 2. The restrictor 5 can prevent the user from manually operating the adjusting mechanism 4 during the movement of the pruning shear and causing the connecting part 42 to be engaged with the cam mechanism 2, avoiding misoperation by the user, and thus can play a protective role for the connecting part 42 and the cam mechanism 2, reducing the possibility of damage to the connecting part 42 and the cam mechanism 2 due to impact, and at the same time can also improve the use safety of the pruning shear; in addition, when the blade assembly 3 needs to be replaced, the connecting part 42 is controlled to be engaged with the cam mechanism 2 through the operating part 41. Then, the user can manually fine-tune the blade assembly 3 through the operating part 41 to adjust the relative position of the first blade 31 and the second blade 32 to a detachable position, and then the disassembly of the blade assembly 3 can be quickly completed, which helps to improve the disassembly efficiency of the blade assembly 3. At the same time, it can also prevent the user from directly touching the blade assembly 3 with their hands, reducing the possibility of the user being scratched by the blade edge, which helps to improve the use safety.

[0033] Such as Figures 2 to 4As shown in the figure, in this embodiment, the adjusting mechanism 4 includes a connecting shaft 44, an operating part 41, a first reset member 43 and a connecting part 42. The housing 1 is provided with a through hole 11 for the connecting shaft 44 to pass through. The connecting shaft 44 can slide along the axial direction of the through hole 11, and the connecting shaft 44 can also rotate relative to the through hole 11. The operating part 41 is fixed to the end of the connecting shaft 44 exposed outside the housing 1, that is, the operating part 41 is exposed outside the housing 1, so as to facilitate the user to operate the operating part 41. The connecting part 42 is fixed to the part of the connecting shaft 44 inside the housing 1. The first reset member 43 is sleeved on the outer peripheral side of the connecting shaft 44. The first reset member 43 is restricted between the top wall around the through hole 11 and the bottom wall of the operating part 41. That is, the first reset member 43 acts on the operating part 41 to make the connecting shaft 44 have an upward sliding tendency. When the operating part 41 is not stressed, the height of the operating part 41 exposed outside the housing 1 is the largest. At this time, the connecting part 42 is higher than the tooth part of the first gear 21, and the tooth part on the outer peripheral side of the connecting part 42 is separated from the tooth part of the first gear 21. At this time, the connecting part 42 is not in transmission connection with the first gear 21. The first reset member 43 can automatically separate the connecting part 42 from the cam mechanism 2, preventing the user from starting the drive motor 62 when the connecting part 42 and the first gear 21 are not disengaged, which helps to reduce the safety hazards of the pruning shears.

[0034] As Figure 4 shown in the figure, in this embodiment, a buffer pad 14 is provided on the bottom wall around the through hole 11. The first reset member 43 drives the connecting part 42 to separate from the cam mechanism 2 and abut against the buffer pad 14. The buffer pad 14 can slow down the impact force between the connecting part 42 and the housing 1, effectively preventing the possibility of the connecting part 42 being displaced or damaged due to long-term impact, which helps to extend the service life of the connecting part 42.

[0035] As Figure 4 shown in the figure, in this embodiment, a guiding hole 12 adapted to the connecting shaft 44 is provided inside the housing 1. The guiding hole 12 is located below the connecting shaft 44. The bottom end of the connecting shaft 44 extends into the guiding hole 12. During the process of the connecting shaft 44 sliding along the axial direction of the through hole 11, the bottom end of the connecting shaft 44 is always inside the guiding hole 12. The adaptation between the connecting shaft 44 and the guiding hole 12 can ensure the accurate movement track of the connecting shaft 44 inside the housing 1, and further ensure that the connecting part 42 can be stably engaged with the cam mechanism 2; in addition, the guiding hole 12 can also play a guiding role in the movement of the connecting shaft 44, making the sliding of the connecting shaft 44 smoother and reducing the possibility of the connecting shaft 44 getting stuck.

[0036] As Figure 1 and Figure 4As shown, in this embodiment, a groove 13 is provided on the outer surface of the housing 1, the through hole 11 is provided on the bottom wall of the groove 13, the operating portion 41 is located in the groove 13, and the top surface of the operating portion 41 is not higher than the notch of the groove 13, which can effectively reduce the direct contact between the operating portion 41 and external objects, thereby reducing the risk of damage to the operating portion 41 caused by impacts, friction, etc.; in addition, it can also reduce the possibility of the operating portion 41 being misoperated, which helps to improve the safety of use of the pruning shear.

[0037] Of course, it can be understood that in other embodiments, the through hole 11 may also be in a long strip shape, and the connecting shaft 44 can move horizontally along the length direction of the through hole 11. The movement of the connecting shaft 44 drives the connecting portion 42 to engage and disengage with the first gear 21 in the horizontal direction. Accordingly, the acting force of the first reset member 43 on the adjusting mechanism 4 is parallel to the length direction of the through hole 11.

[0038] As Figures 3 to 6 As shown, in this embodiment, the limiter 5 includes a solenoid valve 51, an armature shaft 52, and a limit block 54. The solenoid valve 51 has a housing 551 and an end cover 552 that are spliced together. The armature shaft 52 passes through the end cover 552. A second reset member 53 is sleeved on the outer peripheral side of the armature shaft 52. A fixing plate 553 is fixedly connected to the end cover 552. A positioning protrusion 521 protruding radially is provided on the outer peripheral side of the armature shaft 52. Both ends of the second reset member 53 abut against the fixing plate 553 and the positioning protrusion 521 respectively. The limit block 54 is fixed to one end of the armature shaft 52 away from the solenoid valve 51. When the solenoid valve 51 is powered on, the solenoid valve 51 generates a suction force on the armature shaft 52, thereby attracting the armature shaft 52 to approach the solenoid valve 51. At this time, the second reset member 53 is compressed under the action of the fixing plate 553 and the positioning protrusion 521. When the solenoid valve 51 is powered off, the armature shaft 52 loses the suction force of the solenoid valve 51. At this time, the elastic force of the second reset member 53 acts on the positioning protrusion 521, causing the armature shaft 52 to move toward the side away from the solenoid valve 51, thereby realizing the reciprocating movement of the limit block 54. By powering on and off the solenoid valve 51, the position of the limit block 54 can be accurately controlled, so as to realize the reliable limitation and contact of the transmission connection between the connecting portion 42 and the cam mechanism 2; in addition, the solenoid valve 51, as a control element, has the characteristics of fast response speed and high control precision, ensuring that the limit block 54 can quickly and accurately cut into or out of the movement path of the connecting portion 42.

[0039] As Figure 3 and Figure 5As shown, in this embodiment, the limiting block 54 has a first position and a second position. When the limiting block 54 is in the first position, the limiting block 54 is on the movement path of the connecting portion 42, thereby restricting the downward movement of the connecting portion 42 and drivingly connecting with the first gear 21. When the limiting block 54 is in the second position, the limiting block 54 is out of the movement path of the connecting portion 42 to release the restriction on the connecting portion 42 and restrict the engagement of the connecting portion 42 with the cam mechanism 2. Therefore, the limiter 5 can effectively prevent the possibility of mis-engagement between the connecting portion 42 and the cam mechanism 2 and can protect the connecting portion 42 and the cam mechanism 2.

[0040] As Figure 3 and Figure 5 shown, in this embodiment, the armature shaft 52 is horizontally placed. The armature shaft 52 drives the limiting block 54 to slide in the horizontal direction. When the connecting portion 42 is disengaged from the first gear 21, the bottom end surface of the connecting portion 42 is lower than the top end surface of the limiting block 54. In addition, the top end of the limiting block 54 is also higher than the top end surface of the tooth portion of the first gear 21. Therefore, even if the connecting portion 42 abuts against the limiting block 54, the connecting portion 42 is still higher than the first gear 21 to prevent the connecting portion 42 from engaging with the first gear 21. When the solenoid valve 51 is de-energized, the armature shaft 52 slides towards the first gear 21 under the action of the second reset member 53, thereby pushing the limiting block 54 to the first position. At this time, the limiting block 54 is below the connecting portion 42, and the limiting block 54 can further restrict the downward stroke of the connecting portion 42 to avoid the connecting portion 42 engaging with the first gear 21 under the restriction of the limiting block 54. Refer to the blue solid line part in Figure 3 and Figure 5 . When the solenoid valve 51 is energized, the solenoid valve 51 attracts the armature shaft 52, and the armature shaft 52 drives the limiting block 54 to slide to the second position. At this time, the limiting block 54 is out of the movement path of the connecting portion 42, and the limiting block 54 will not interfere with the movement of the connecting portion 42, so that the connecting portion 42 can smoothly engage with the first gear 21. Refer to the yellow dotted line part in Figure 3 and Figure 5 .

[0041] In this embodiment, the casing 1 is further provided with a control mechanism. The control mechanism includes a control panel 61 and a control switch 63. The control switch 63 is provided with a first switch for controlling the drive motor 62 and a second switch for controlling the solenoid valve 51. The control panel 61 is electrically connected to the drive motor 62 and the solenoid valve 51 respectively through the control switch 63. During the use of the pruning shears, the user controls the start and stop of the drive motor 62 through the first switch. When the drive motor 62 is in the running state, the control panel 61 cuts off the electrical connection with the solenoid valve 51. At this time, the user cannot make the solenoid valve 51 conduct electricity by operating the second switch, so as to avoid the solenoid valve 51 being powered on due to the user's misoperation, resulting in the limit block 54 releasing the restriction on the connecting portion 42, ensuring that the connecting portion 42 cannot engage with the first gear 21 when the drive motor 62 is in the running state. Since when the drive motor 62 is in the starting state, the first gear 21 rotates at a relatively high speed under the drive of the drive motor 62, and during the rotation of the cam mechanism 2, if the connecting portion 42 engages with the cam mechanism 2, the connecting portion 42 will interfere with the rotation of the cam mechanism 2, causing a relatively strong impact between the connecting portion 42 and the cam mechanism 2, which is likely to damage the connecting portion 42 and the cam mechanism 2. The limiter 5 reduces the possibility of the connecting portion 42 and the cam mechanism 2 being damaged by impact and can also improve the use safety of the pruning shears.

[0042] When the user needs to grind the cutting edge of the blade assembly 3, the user first needs to turn off the drive motor 62 through the first switch. At this time, the control panel 61 releases the power-off of the solenoid valve 51. The user can make the solenoid valve 51 conduct electricity and be powered on by operating the second switch. The solenoid valve 51 generates a magnetic force and attracts the armature shaft 52 to approach the solenoid valve 51. At this time, the armature shaft 52 drives the limit block 54 to move away from the first gear 21 and reach the second position. The limit block 54 releases the restriction on the connecting portion 42. The user presses the operating portion 41, so that the connecting portion 42 moves downward along the connecting shaft 44 until the connecting portion 42 remains engaged with the first gear 21. Then the user rotates the operating portion 41, thereby driving the first gear 21 to rotate through the connecting portion 42. The first gear 21 drives the connecting rods 22 on the upper and lower sides through the convex blocks 211, so that the first blade 31 and the second blade 32 slide relative to each other until the first blade 31 and the second blade 32 overlap, which is convenient for the user to grind the cutting edge. When the blade assembly 3 is adjusted to the appropriate position, the user releases the operating portion 41, and the operating portion 41 moves upward under the action of the first reset member 43, so that the connecting portion 42 is separated from the first gear 21, avoiding the operating portion 41 being accidentally touched and causing the position of the blade assembly 3 to change, and ensuring that the blade assembly 3 can be locked in the appropriate position for the user to grind the cutting edge.

[0043] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An adjustable pruning shear, comprising a housing (1), a blade assembly (3) and a driving device, wherein the blade assembly (3) comprises a first blade (31) and a second blade (32) which can slide relative to each other, and the driving device comprises a driving motor (62) and a cam mechanism (2), wherein the driving motor (62) drives the first blade (31) and the second blade (32) to slide relative to each other through the cam mechanism (2), characterized in that: The housing (1) is further provided with a limiter (5) and an adjustment mechanism (4); the adjustment mechanism (4) comprises an operating portion (41), a first reset member (43), and a connecting portion (42) which can be transmission-connected to the cam mechanism (2); the operating portion (41) controls the connecting portion (42) to be transmission-connected to the cam mechanism (2) to drive the relative sliding of the first blade (31) and the second blade (32); the first reset member (43) causes the connecting portion (42) to have a movement tendency to separate from the cam mechanism (2); and the limiter (5) limits the transmission connection between the connecting portion (42) and the cam mechanism (2) when the drive motor (62) is started.

2. The adjustable pruning shears according to claim 1, characterized in that: The housing (1) is provided with a through hole (11) for the adjusting mechanism (4) to pass through; the adjusting mechanism (4) is rotatably matched with the housing (1) through the through hole (11); the operating portion (41) is exposed outside the housing (1); the adjusting mechanism (4) slides along the through hole (11) to enable the connecting portion (42) to be connected or separated from the cam mechanism (2); and the first reset member (43) is restricted between the housing (1) and the operating portion (41).

3. The adjustable pruning shears according to claim 2, characterized in that: The adjustment mechanism (4) further comprises a connecting shaft (44); a guide hole (12) adapted to the connecting shaft (44) is provided in the housing (1); one end of the connecting shaft (44) is fixedly connected to the operating portion (41); the other end is at least partially located in the guide hole (12); and the connecting portion (42) is fixedly connected to the portion of the connecting shaft (44) located in the housing (1).

4. The adjustable pruning shears according to claim 2, characterized in that: A buffer pad (14) is provided on the bottom wall around the through hole (11), and the first reset member (43) drives the connecting portion (42) to separate from the cam mechanism (2) and to abut against the buffer pad (14).

5. The adjustable pruning shears according to claim 1, characterized in that: The limiter (5) comprises a driver and a limit block (54), wherein the limit block (54) has a first position and a second position, wherein the first position of the limit block (54) places the limit block (54) on a movement path of the connecting portion (42) to limit the transmission connection between the connecting portion (42) and the cam mechanism (2), and the second position of the limit block (54) places the limit block (54) away from the connecting portion (42) to release the restriction on the connecting portion (42).

6. The adjustable pruning shears according to claim 5, characterized in that: The driver comprises an electromagnetic valve (51) and an armature shaft (52); a limit block (54) is fixed to one end of the armature shaft (52) away from the electromagnetic valve (51); a second reset member (53) is arranged on the armature shaft (52); the electromagnetic valve (51) is electrically attracted to the armature shaft (52) so that the limit block (54) is away from the connecting portion (42) and reaches a second position; when the electromagnetic valve (51) loses power, the second reset member (53) acts on the armature shaft (52) so that the limit block (54) reaches the first position.

7. The adjustable pruning shears according to claim 6, characterized in that: The housing (1) is further provided with a control mechanism, which comprises a control panel (61) and a control switch (63). The control switch (63) is connected in series between the control panel (61) and the solenoid valve (51). When the drive motor (62) is started, the control panel (61) blocks the electrical connection with the solenoid valve (51). When the drive motor (62) is stopped, the control switch (63) controls the on and off of the solenoid valve (51).

8. The adjustable pruning shears according to claim 1, characterized in that: The cam mechanism (2) comprises a first gear (21) rotatably arranged in the housing (1); the output end of the driving motor (62) is provided with a second gear (621) transmission-connected to the first gear (21); and the outer peripheral side of the connecting portion (42) is provided with a tooth portion meshing with the first gear (21).

9. The adjustable pruning shears according to claim 1, characterized in that: The outer surface of the housing (1) is provided with a groove (13), and the top end surface of the operating portion (41) is not higher than the notch of the groove (13).

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