Blade transmission assembly and electric scissors comprising same

Abstract

The utility model provides a blade transmission assembly and electric scissors comprising the same. The blade transmission assembly comprises a blade bearing, a fixed blade supporting piece, a movable blade supporting piece and a center screw sequentially penetrating through the fixed blade supporting piece, the movable blade supporting piece and the blade bearing. The movable blade supporting piece and the cycloid gear below the movable blade supporting piece integrally form an integrated transmission piece. The central screw penetrates through the middle part of the integrated transmission part and a group of wear-resistant gaskets and needle roller plane bearings which are respectively arranged on two sides of the integrated transmission part; the blade seat is thin in top and thick in bottom and is provided with a hole upwards from the bottom surface; the bevel gear extends from the bottom of the blade seat, at least one side of the bevel gear is exposed out of the blade seat, and the bevel gear is in meshing transmission with the cycloid gear; and the bevel gear is driven by a gearbox at the lower part of the bevel gear. Working noise and mechanical abrasion of the scissors can be reduced, and the service life of the scissors is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of trimming tools, and in particular to a blade transmission assembly and an electric scissors comprising the same. Background Art

[0002] In landscaping, electric shears are often used to prune branches to maintain the aesthetic shape of trees and shrubs. Electric shears are handheld power tools powered by a DC motor, which drives the blades through a blade transmission mechanism. They are convenient for cutting various branches, plastic pipes, rods, and other non-metallic materials, and are lightweight and reliable.

[0003] The sliding friction generated when the moving and fixed parts in the blade drive mechanism are locked together leads to problems such as high noise, rapid heat generation, and accelerated machine wear. Secondly, the wear caused by prolonged sliding friction between the moving blade and the drive mechanism is also one of the reasons why the scissors malfunction. Utility Model Content

[0004] In view of the above-mentioned defects in the existing technology, the present invention provides a blade transmission assembly and an electric scissors including the same to reduce working noise and mechanical wear, extend the service life of the scissors, and reduce maintenance costs.

[0005] To achieve the above objectives, on the one hand, this utility model provides a blade transmission assembly, including a blade holder, a fixed blade support plate, a movable blade support plate, and a central screw that passes through the fixed blade support plate, the movable blade support plate, and the blade holder in sequence; the central screw is fixed to the rear side of the blade holder by a lock nut;

[0006] The moving blade support plate and the cycloidal gear below it form an integral transmission component; the central screw passes through the middle of the integral transmission component and a set of wear-resistant pads and needle roller bearings respectively provided on both sides of the integral transmission component; the blade holder is thin at the top and thick at the bottom and has a hole from the bottom to the top; the bevel gear extends from the bottom of the blade holder and protrudes from the blade holder on at least one side, meshing with the cycloidal gear for transmission; the bevel gear is driven through the gearbox below it.

[0007] The blade transmission assembly is designed with the moving blade support plate and the transmission cycloidal gear integrated to avoid relative sliding between the moving blade and the transmission structure, thus extending the service life of the scissors. A set of wear-resistant shims and needle roller flat bearings are designed between the moving parts and the fixed parts to reduce the operating noise and mechanical wear of the scissors.

[0008] In some embodiments of the first aspect, a first slot is formed on the side of the integrated transmission component, at the corresponding position of the wear-resistant pad and the needle roller bearing; the depth of the first slot is greater than the thickness of the wear-resistant pad, but less than the total thickness of the wear-resistant pad and the needle roller bearing.

[0009] In some embodiments of the first aspect, the center screw has a second slot at the corresponding position of the wear-resistant pad and the needle roller bearing; the depth of the second slot is greater than the thickness of the wear-resistant pad and less than the total thickness of the wear-resistant pad and the needle roller bearing.

[0010] By adopting the above technical solution, the wear-resistant shim and the needle roller bearing are well limited, and the contact surface of the moving parts is the rolling surface of the needle roller bearing, which can minimize sliding friction.

[0011] In some embodiments of the first aspect, the external thread at the bottom of the blade holder is connected to the gearbox.

[0012] In some embodiments of the first aspect, the locking nut is a Phillips head nut to improve the fastening strength.

[0013] On the other hand, this utility model provides an electric scissor, including the blade transmission assembly as described above, and also including a fixed blade fixed on the fixed blade support plate, a movable blade fixed on the movable blade support plate, a housing outside the blade transmission assembly, and a motor; the output shaft of the motor is connected to the gearbox.

[0014] In some embodiments of the second aspect, the side of the blade holder is provided with multiple housing positioning elements to facilitate rapid positioning and limiting of the external housing.

[0015] Compared with the prior art, the above-mentioned utility model has the following advantages or beneficial effects:

[0016] (1) This utility model avoids relative sliding between the moving blade and the transmission structure by integrating the moving blade support plate and the transmission cycloidal gear, thus extending the service life of the scissors.

[0017] (2) This utility model reduces the noise and mechanical wear of the scissors by designing a set of wear-resistant pads and needle roller flat bearings between the moving parts and the fixed parts.

[0018] (3) This utility model limits the wear-resistant pad and the needle roller flat bearing by setting a groove of appropriate depth, so that the contact surface of the moving part is the rolling surface of the needle roller flat bearing, which can avoid sliding friction as much as possible. Attached Figure Description

[0019] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; the focus is on illustrating the main idea of ​​the invention.

[0020] Figure 1 This is a front view of a blade drive assembly according to an embodiment of the present invention;

[0021] Figure 2 This is a right view of a blade drive assembly according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the exploded structure;

[0023] Figure 4 This is a front view of an integrated transmission component in one embodiment of the present invention;

[0024] Figure 5 This is a right view of the integrated transmission component in one embodiment of the present invention;

[0025] Figure 6 This is a front view of the blade holder in one embodiment of the present invention;

[0026] Figure 7 This is a right view of the blade holder in one embodiment of the present invention;

[0027] Figure 8 This is a front view of the blade drive assembly connecting to the motor according to an embodiment of the present invention;

[0028] Figure 9 This is a right view of the blade drive assembly connected to the motor according to an embodiment of the present invention;

[0029] In the attached diagram: 1. Blade holder; 2. Fixed blade support plate; 3. Moving blade support plate; 4. Needle roller bearing; 5. Wear-resistant gasket; 6. Center screw; 7. Locking nut; 8. Gearbox; 9. Motor; 10. Bevel gear; 11. Cycloidal gear; 21. First slot; 22. Second slot; 31. Integrated transmission component; 41. External thread; 42. Housing positioning component. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. It should be understood that all of these exemplary embodiments described are merely some embodiments and examples of the present invention, and not all of them. Rather, these exemplary embodiments are provided so that those skilled in the art can more thoroughly understand the present disclosure and to more completely convey the technical content of the present disclosure to those skilled in the art.

[0031] In the description of this application, the terms "upper," "lower," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the present invention and do not require the present invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the present invention. It should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Example 1

[0033] See Figures 1 to 3 This embodiment provides a blade drive assembly, including a blade holder 1, a fixed blade support plate 2, a movable blade support plate 3, and a center screw 6 that passes through the fixed blade support plate 2, the movable blade support plate 3, and the blade holder 1 in sequence; the center screw 6 is fixed to the rear side of the blade holder 1 by a lock nut 7.

[0034] The moving blade support plate 3 and the cycloidal gear 11 below it form an integral transmission component 31; the central screw 6 passes through the middle of the integral transmission component 31 and a set of wear-resistant pads 5 and needle roller bearings 4 respectively provided on both sides of the integral transmission component 31; the blade holder 1 is thin at the top and thick at the bottom and has a hole from the bottom to the top; the bevel gear 10 extends from the bottom of the blade holder 1 and protrudes from the blade holder 1 on at least one side, meshing with the cycloidal gear 11 for transmission; the bevel gear 10 is driven by the gearbox 8 below it.

[0035] The gearbox 8 of the blade transmission assembly is driven by a drive mechanism such as a motor, which drives the bevel gear 10 to rotate. The bevel gear 10 drives the cycloidal gear 11 to rotate. The cycloidal gear 11 and the moving blade support plate 3 are designed as an integral part, thus completing the transmission from the drive mechanism to the moving blade. The blade transmission assembly, through the integrated design of the moving blade support plate and the transmission cycloidal gear, avoids relative sliding between the moving blade and the transmission structure, extending the service life of the scissors. A set of wear-resistant shims and needle roller bearings are designed between the moving parts and the fixed parts to reduce the operating noise and mechanical wear of the scissors.

[0036] See Figures 3 to 5 As a preferred technical solution, further: a first groove 21 is opened on the side of the integrated transmission component 31, at the corresponding positions of the wear-resistant pad 5 and the needle roller bearing 4; the depth of the first groove 21 is greater than the thickness of the wear-resistant pad 5 and less than the total thickness of the wear-resistant pad 5 and the needle roller bearing 4.

[0037] See Figures 3 to 5As a preferred technical solution, further: the center screw 6 has a second groove 22 at the corresponding position of the wear-resistant washer 5 and the needle roller bearing 4; the depth of the second groove 22 is greater than the thickness of the wear-resistant washer 5 and less than the total thickness of the wear-resistant washer 5 and the needle roller bearing 4.

[0038] By adopting the above technical solution, the wear-resistant shim 5 and the needle roller bearing 4 are well limited, and the contact surface of the moving parts is the rolling surface of the needle roller bearing, which can minimize sliding friction.

[0039] As a concrete example, a groove with a diameter of 20.5 mm and a depth of 2.9 mm is machined on the active contact surface of the integrated transmission component 31 after forging a blank. The wear-resistant pad 5 (generally a steel sheet can be used) and the needle roller flat bearing 4 are installed in the groove, and then locked and connected with the fixed blade support plate 2. This allows the needle roller flat bearing 4 and the fixed blade support plate 2 to generate rolling friction to reduce friction, which greatly improves the overall service life of the scissors. For example, the machine noise can be reduced from 38 decibels to 33 decibels, the maximum heat generation temperature can be reduced from 65 degrees to 48 degrees, the durability of the friction surface is increased by at least 10 times, and the maintenance cost is reduced by 300%, allowing scissor users to experience the superiority of this design structure.

[0040] See Figure 6 and Figure 7 As a preferred technical solution, the external thread 41 at the bottom of the blade holder 1 is connected to the gearbox 8.

[0041] As a preferred technical solution, the locking nut 7 is a Torx nut to improve the fastening strength.

[0042] Example 2

[0043] See Figure 8 and Figure 9 This utility model provides an electric scissor, including the blade transmission assembly described in Embodiment 1, and further including a fixed blade fixed on a fixed blade support plate 2, a movable blade fixed on a movable blade support plate 3, a housing outside the blade transmission assembly, and a motor 9; the output shaft of the motor 9 is connected to a gearbox 8. The motor 9 can be a commercially available ordinary motor or a brushless motor.

[0044] See Figures 6 to 9 As a preferred technical solution, furthermore: the side of the blade holder 1 is provided with multiple housing positioning parts 42 to facilitate the rapid positioning and limiting of the external housing.

[0045] When using the electric shears, place the object to be trimmed between the moving blade and the fixed blade, start the electric shears, and the motor drives the blade transmission mechanism to make the moving blade engage with the fixed blade for trimming.

[0046] In summary, this application provides a blade transmission assembly and an electric scissors comprising the same. The blade transmission assembly includes a blade holder, a fixed blade support plate, a movable blade support plate, and a central screw that passes sequentially through the fixed blade support plate, the movable blade support plate, and the blade holder. The movable blade support plate and its underlying cycloidal gear form an integral transmission component. The central screw passes through the middle of the integral transmission component and a set of wear-resistant pads and needle roller bearings respectively disposed on both sides of the integral transmission component. The blade holder is thinner at the top and thicker at the bottom, with an opening from the bottom upwards. A bevel gear extends into the blade holder from the bottom, with at least one side protruding from the blade holder, and meshes with the cycloidal gear for transmission. The bevel gear is driven through a gearbox at its lower part. This invention can reduce the operating noise and mechanical wear of the scissors, and extend their service life.

[0047] The standard parts used in this application can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed directly based on existing technical common sense without any doubt.

[0048] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A blade drive assembly, comprising a blade holder (1), a fixed blade support plate (2), a movable blade support plate (3), and a central screw (6) passing sequentially through the fixed blade support plate (2), the movable blade support plate (3), and the blade holder (1); the central screw (6) is fixed to the rear side of the blade holder (1) by a lock nut (7); characterized in that, The moving blade support plate (3) and the cycloidal gear (11) below it form an integral transmission component (31); the central screw (6) passes through the middle of the integral transmission component (31) and a set of wear-resistant pads (5) and needle roller bearings (4) respectively provided on both sides of the integral transmission component (31); the blade holder (1) is thin at the top and thick at the bottom and has a hole from the bottom to the top; the bevel gear (10) extends from the bottom of the blade holder (1) and protrudes from the blade holder (1) on at least one side, meshing with the cycloidal gear (11) for transmission; the bevel gear (10) is driven by the gearbox (8) below it.

2. The blade drive assembly according to claim 1, characterized in that, The first slot (21) is opened on the side of the integrated transmission component and at the corresponding position of the wear-resistant pad (5) and the needle roller bearing (4); the depth of the first slot (21) is greater than the thickness of the wear-resistant pad (5) and less than the total thickness of the wear-resistant pad (5) and the needle roller bearing (4).

3. A blade drive assembly according to claim 1 or 2, characterized in that, The center screw (6) has a second slot (22) at the corresponding position of the wear-resistant pad (5) and the needle roller bearing (4); the depth of the second slot (22) is greater than the thickness of the wear-resistant pad (5) and less than the total thickness of the wear-resistant pad (5) and the needle roller bearing (4).

4. The blade drive assembly according to claim 1, characterized in that, The external thread (41) at the bottom of the blade holder (1) is connected to the gearbox (8).

5. A blade drive assembly according to claim 1, characterized in that, The locking nut (7) is a plum nut.

6. An electric pair of scissors, characterized in that, The blade drive assembly as described in any one of claims 1 to 5 further includes a fixed blade fixed to the fixed blade support plate (2), a movable blade fixed to the movable blade support plate (3), a housing on the outside of the blade drive assembly, and a motor (9); the output shaft of the motor (9) is connected to the gearbox (8).

7. An electric scissors according to claim 6, characterized in that, The blade holder (1) is provided with multiple housing positioning parts (42) on its side.

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