Bidirectional drive mechanism for electric scissors blades and electric scissors blades

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electric scissors, and in particular relates to a bidirectional driving mechanism for electric scissors blades and an electric scissors.BACKGROUND

[0002] Electric scissors are branch and trunk pruning tools used for orchards, gardens, vines, and the like. According to a traditional bidirectional drive mechanism for electric scissors blades, a driving gear is used to drive two bevel gears, and is then meshed with a swing arms with two racks through the bevel gears to drive two blades of the scissors to shear. However, the electric scissors of this structure have a large number of parts structurally, which makes it difficult to assemble, and this complex structure used is difficult to disassemble and to replace a certain part. In case of being damaged, the electric scissors need to be replaced entirely. In order to solve this problem, the applicant proposed a patent with number: 202020466816.4, entitled as "a novel electric scissors blade dual driving mechanism," which uses a gear connected to the motor to directly drive two blades with racks, such that the two blades of the scissors are directly driven to shear. The bevel gear is removed and the number of parts is reduced. However, the design of this structure has the following problems:

[0003] First, for a thickness of the electric scissors, it is necessary to consider a diameter of the gear and thicknesses of the two blades. In order to ensure the meshing of the driving gear with the rack, a rear part of the blade must have a large thickness, but such a large thickness will hinder the blade when shearing some intricate vines and branches, causing inaccurate shearing.

[0004] Second, when the rear parts of the two blades swing to a maximum extent, the meshing degree between the driving gear and teeth will be affected to a certain extent, which will cause the blades to open outwards when cutting some thicker vines and branches, causing damage to the electric scissors and reducing service life thereof.

[0005] In view of this, it is necessary to further propose an improved solution to solve the problems above-mentioned.

[0006] CN111512813 discloses a novel double-moving blade electric scissors. The electric scissors comprises a main body support, first and second swing teeth which are rotationally installed on the main body support through a pin-fit-nut manner, a first moving blade installed on the first swing tooth, a second moving blade installed on the second swing tooth, a bevel gear installed on the main body support and used to drive the first and second swing teeth to relatively swing to drive the first and second moving blades to relatively open or relatively close, and driving apparatus for driving the bevel gear to rotate. In the electric scissors, one bevel gear is used to drive the first and second swing teeth to relatively swing, and the first and second swing teeth can respectively drive the first and second moving blades to relatively open or relatively close while the first and second swing teeth are relatively swung so as to realize the opening or cutting action.

[0007] EP3673725A1Discloses a cutting device with at least a first and a second cutting element that can be moved relative to one another, with a first and a second lever element that can be moved relative to one another, in particular a grip element, for opening and closing the cutting elements. Driving gear 602 is rotatably mounted on second lever member 504 and spacer 562 of second lever member 504, respectively. The gear wheel 602 is supported on the one hand on a toothed section 604 of the first lever element 502 or a toothed section 604 of the spacer 560 of the first lever element 502 and on the other hand on a toothed section 606 of the second cutting element 14 or a toothed section 606 of the lever arm 557 of the second cutting element 14.SUMMARY

[0008] In view of this, the present disclosure is mainly directed to provide a bidirectional driving mechanism for electric scissors blades.

[0009] The present invention is defined by a bidirectional driving mechanism for electric scissors blades according to independent claim 1.

[0010] Preferably, the rotating shaft member includes a stop screw and a nut, a rotating shaft hole D is provided in the fixed seat, and the stop screw passes through the rotating shaft hole D and is in threaded connection with the nut

[0011] Preferably, the stop screw comprises a connecting rod and a limiting cap, one end of the connecting rod is engaged with the limiting cap, and the other end of the connecting rod is provided with threads.

[0012] Preferably, a rotating shaft hole A is provided in a front part of the meshing block, a rotating shaft hole B is provided in a rear part of the upper blade, a rotating shaft hole C is provided in a middle part of the lower blade, and the rotating shaft hole A, the rotating shaft hole B and the rotating shaft hole C all rotate around the rotating shaft member.

[0013] Preferably, the first protrusion is arranged at a front upper side of the shaft hole A, and the second protrusion is arranged at a front upper side of the shaft hole B.

[0014] Preferably, the outer rack and the inner rack are of arc-shaped structures.

[0015] Preferably, a gear hole is provided in the fixed seat, a deep groove bearing is connected in the gear hole, and a pin shaft of the driving gear is in running fit with the deep groove bearing.

[0016] An electric scissors includes a driving assembly. An output end of the driving assembly is dynamically connected to the pin shaft of the driving gear to drive the driving gear to rotate.

[0017] Compared with the prior art, the present disclosure has the following beneficial effects: The driving gear and the rotating shaft member are arranged on the fixed seat, and the rotating shaft member makes the upper blade group and the lower blade rotate around it. Moreover, the meshing block is arranged, the inner rack is arranged at the rear part of the meshing block, the inner rack faces the outer rack at the rear part of the lower blade, and both sides of the driving gear are meshed with the inner rack and the outer rack respectively. Through this structure, the inner rack and the driving gear are located behind the outer rack, and there is no need to provide a position for mounting the driving gear between the upper blade and the lower blade, such that the thickness is reduced

[0018] When driving, the driving gear, the upper blade and the lower blade all rotate in a circumferential direction in the same plane, and the situation that the upper blade and the lower blade open outwards since the circumferential rotation of the gear and the circumferential rotation of the upper blade and the lower blade are perpendicular to each other is avoided, thereby improving the stability of the bidirectional driving mechanism of electric scissors blades, and making the bidirectional driving mechanism of electric scissors blades more durable.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a schematic structural diagram of Embodiment 1 of the present disclosure. However, this embodiment does not fall under the scope of the present invention. FIG. 2 is an exploded structural diagram of Embodiment 1 of the present disclosure. However, this embodiment does not fall under the scope of the present invention. FIG. 3 is a schematic structural diagram of Embodiment 2 of the present disclosure. This embodiment falls under the scope of the present invention. FIG. 4 is an exploded structural diagram of Embodiment 2 of the present disclosure. This embodiment falls under the scope of the present invention. DESCRIPTION OF THE EMBODIMENTS

[0020] The present disclosure will be described in detail below with reference to embodiments and drawings.

[0021] Referring to FIG. 1 to FIG. 4, the present disclosure provides a bidirectional driving mechanism for electric scissors blades, including a fixed seat 10, a driving gear 50, a rotating shaft member 40, an upper blade group 30 and a lower blade 20. The driving gear 50 and the rotating shaft member 40 are arranged on the fixed seat 10, the lower blade 20 and the upper blade group 30 rotate around the rotating shaft member 40, an outer rack 21 is arranged at a rear part of the lower blade 20, a front part of the upper blade group 30 is an upper blade 32, a rear part of the upper blade group 30 is a meshing block 33, and an inner rack 31 is arranged at a rear part of the meshing block 33; and the inner rack 31 and the outer rack 21 are respectively meshed with both sides of the driving gear 50.

[0022] The driving gear 50 and the rotating shaft member 40 are arranged on the fixed seat 10, and the rotating shaft member 40 makes the upper blade group 30 and the lower blade 20 rotate around it. Moreover, the meshing block 33 is arranged, the inner rack 31 is arranged at the rear part of the meshing block 33, the inner rack 31 faces the outer rack 21 at the rear part of the lower blade 20, and both sides of the driving gear 50 are meshed with the inner rack and the outer rack 21 respectively. Through this structure, the inner rack 31 and the driving gear 50 are located behind the outer rack 21, and there is no need to provide a position for mounting the driving gear between the upper blade 32 and the lower blade 20, such that the thickness is reduced. In addition, when driving, the driving gear 50, the upper blade 32 and the lower blade 20 all rotate in a circumferential direction in the same plane, and the situation that the upper blade 32 and the lower blade 20 open outwards since the circumferential rotation of the gear and the circumferential rotation of the upper blade 32 and the lower blade 20 are perpendicular to each other is avoided, thereby improving the stability of the bidirectional driving mechanism of electric scissors blades, and making the bidirectional driving mechanism of electric scissors blades more durable.

[0023] Further, as shown in FIG. 2 and FIG. 4, the rotating shaft member 40 includes a stop screw 41 and a nut 42, a rotating shaft hole D is provided in the fixed seat 10, and the stop screw 41 passes through the rotating shaft hole D and is in threaded connection with the nut 42.

[0024] Further, as shown in FIG. 2 and FIG. 4, the stop screw 41 includes a connecting rod (not shown) and a limiting cap (not shown), one end of the connecting rod is engaged with the limiting cap, and the other end of the connecting rod is provided with threads. The stop screw 41 and the nut 42 are arranged, and the stop screw 41 includes the connecting rod and the limiting cap, such that the detachable property is realized.

[0025] Further, as shown in FIG. 3 to FIG. 4, a rotating shaft hole A is provided in a front part of the meshing block 33, a rotating shaft hole B is provided in a rear part of the upper blade 32, a rotating shaft hole C is provided in a middle part of the lower blade 20, and the rotating shaft hole A, the rotating shaft hole B and the rotating shaft hole C all rotate around the rotating shaft member 40; a pin hole E is also provided in the front part of the meshing block 33, a pin hole F is provided in the rear part of the upper blade 32, and a pin 34 is connected in both the pin hole E and the pin hole F. With this arrangement, the meshing block 33 and the upper blade 32 are of detachable structures, and thus can be detached for separate replacement when the inner rack 31 on a meshing portion is used for a long time or the upper blade 32 is used for a long time and the accuracy decreases, which improves the flexibility of replacement. Moreover, the pin 34 is arranged to cooperate with the rotating shaft member 40 to realize the mutual positioning and cooperation of the meshing block 33 and the upper blade 32, such that the meshing block 33 can drive the upper blade 32 to rotate to realize shearing.

[0026] Further, as shown in FIG. 3 to FIG. 4, a first protrusion 331 is arranged at the front part of the meshing block 33, and the pin hole E is located at the first protrusion 331; a second protrusion 321 is arranged at the rear part of the upper blade 32, and the pin hole F is located at the second protrusion 321; and suitable positions are provided for the pin holes.

[0027] Further, as shown in FIG. 3 to FIG. 4, the first protrusion 331 is arranged at a front upper side of the shaft hole A, and the second protrusion 321 is arranged at a front upper side of the shaft hole B. With this position structure, when the meshing block 33 drives the pin 34 to operate, a moving path of the pin 34 is just toward a connecting line between the rotating shaft hole of the upper blade 32 and the pin hole. During this process, the pin 34 swings by being vertically against the upper blade 32. With this arrangement, the wear between the pin 34 and the pin hole can be reduced to a minimum, and the stability of shearing can be improved, thereby further prolonging the service life of the bidirectional drive mechanism for electric scissors blades.

[0028] Further, as shown in FIG. 1 to FIG. 4, the outer rack 21 and the inner rack 31 are of arc-shaped structures; and the centers of circles corresponding to arcs of the outer rack 21 and the inner rack 31 are made correspond to a center line of the rotating shaft member 40, so as to realize close meshing with the driving gear 50.

[0029] Further, as shown in FIG. 2 and FIG. 4, a gear hole 11 is provided in the fixed seat 10, a deep groove bearing 12 is connected in the gear hole 11, and a pin shaft of the driving gear 50 is in running fit with the deep groove bearing 12, so as to realize rotation of the driving gear 50.

[0030] An electric scissors includes a driving assembly. An output end of the driving assembly is dynamically connected to the pin shaft of the driving gear 50 to drive the driving gear 50 to rotate, and the rotation of the driving gear 50 drives the outer rack 21 and the inner rack 31 to rotate synchronously, such that the upper blade 32 and the lower blade 20 swing up and down to complete shearing.

[0031] In the above technical means, in order to more illustrate the operating principle of the bidirectional drive mechanism for electric scissors blades clearly, further descriptions will be given from the following two embodiments:Embodiment 1

[0032] Referring to FIG. 1 to FIG. 2, a bidirectional driving mechanism for electric scissors blades includes a fixed seat 10, a driving gear 50, a rotating shaft member 40, an upper blade group 30 and a lower blade 20. The driving gear 50 and the rotating shaft member 40 are arranged on the fixed seat 10, the lower blade 20 and the upper blade group 30 rotate around the rotating shaft member 40, an outer rack 21 is arranged at a rear part of the lower blade 20, a front part of the upper blade group 30 is the upper blade 32, a rear part of the upper blade group 30 is a meshing block 33, and an inner rack 31 is arranged at a rear part of the meshing block 33; and the inner rack 31 and the outer rack 21 are respectively meshed with both sides of the driving gear 50. The rotating shaft member 40 includes a stop screw 41 and a nut 42, a rotating shaft hole D is provided in the fixed seat 10, and the stop screw 41 passes through the rotating shaft hole D and is in threaded connection with the nut 42. The stop screw 41 includes a connecting rod and a limiting cap, one end of the connecting rod is engaged with the limiting cap, and the other end of the connecting rod is provided with threads. In practical applications, the driving assembly drives the driving gear 50 to rotate, under the rotation of the driving gear 50, the bidirectional driving mechanism for electric scissors blade drives the inner rack 31 and the outer rack 21 to swing, thereby driving the upper blade 32 and the lower blade 20 to shear. When a part is damaged, the nut 42 is loosened, the mechanism is entirely disassembled to replace the damaged part.Embodiment 2

[0033] As shown FIG. 3 to FIG. 4, a bidirectional driving mechanism for electric scissors blades includes a fixed seat 10, a driving gear 50, a rotating shaft member 40, an upper blade group 30 and a lower blade 20. The driving gear 50 and the rotating shaft member 40 are arranged on the fixed seat 10, the lower blade 20 and the upper blade group 30 rotate around the rotating shaft member 40, an outer rack 21 is arranged at a rear part of the lower blade 20, a front part of the upper blade group 30 is an upper blade 32, a rear part of the upper blade group 30 is a meshing block 33, and an inner rack 31 is arranged at a rear part of the meshing block 33. The inner rack 31 and the outer rack 21 are respectively meshed with both sides of the driving gear 50. The rotating shaft member 40 includes a stop screw 41 and a nut 42, a rotating shaft hole D is provided in the fixed seat 10, and the stop screw 41 passes through the rotating shaft hole D and is in threaded connection with the nut 42. The stop screw 41 includes a connecting rod and a limiting cap, one end of the connecting rod is engaged with the limiting cap, and the other end of the connecting rod is provided with threads. A rotating shaft hole A is provided in a front part of the meshing block 33, a rotating shaft hole B is provided in a rear part of the upper blade 32, a rotating shaft hole C is provided in a middle part of the lower blade 20, and the rotating shaft hole A, the rotating shaft hole B and the rotating shaft hole C all rotate around the rotating shaft member 40. A pin hole E is also provided in the front part of the meshing block 33, a pin hole F is provided in the rear part of the upper blade 32, and a pin 34 is connected in both the pin hole E and the pin hole F. In practical applications, the driving assembly drives the driving gear 50 to rotate, under the rotation of the driving gear 50, the bidirectional driving mechanism for electric scissors blade drives the inner rack 31 and the outer rack 21 to swing, thereby driving the upper blade 32 and the lower blade 20 to shear. When a part is damaged, the nut 42 is loosened, the mechanism is entirely disassembled to replace the damaged part. If the meshing block 33 or the upper blade 32 is damaged, the pin 34 is knocked out with a nail or similar tool, and then the meshing block 33 or the upper blade 32 is replaced.

[0034] For those skilled in the art, it is obvious that the present invention is not limited to the details of the foregoing exemplary embodiments, and the present disclosure can be implemented in other specific forms without departing from the scope of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalents are encompassed in the present invention. Any numerals in the claims should not be regarded as the limiting to the claims involved.

Claims

1. A bidirectional driving mechanism for electric scissors blades, comprising a fixed seat (10), a driving gear (50), a rotating shaft member (40), an upper blade group (30) and a lower blade (20), wherein the driving gear (50) and the rotating shaft member (40) are arranged on the fixed seat (10), the lower blade (20) and the upper blade group (30) rotate around the rotating shaft member (40), an outer rack (21) is arranged at arear part of the lower blade (20), a front part of the upper blade group (30) is an upper blade (32), a rear part of the upper blade group (30) is a meshing block (33), and an inner rack (31) is arranged at a rear part of the meshing block (33); and the inner rack (31) and the outer rack (21) are respectively meshed with both sides of the driving gear (50); a pin hole E is provided in the front part of the meshing block (33), a pin hole F is provided in the rear part of the upper blade (32), and a pin (34) is connected in both the pin hole E and the pin hole F, the bidirectional driving mechanism is characterized that, a first protrusion is arranged at the front part of the meshing block (33), and the pin hole E is located at the first protrusion; and a second protrusion is arranged at the rear part of the upper blade (32), and the pin hole F is located at the second protrusion.

2. The bidirectional driving mechanism for electric scissors blades according to claim 1, wherein the rotating shaft member (40) includes a stop screw (41) and a nut (42), a rotating shaft hole D is provided in the fixed seat, and the stop screw (41) passes through the rotating shaft hole D and is in threaded connection with the nut (42).

3. The bidirectional driving mechanism for electric scissors blades according to claim 2, wherein the stop screw (41) comprises a connecting rod and a limiting cap, one end of the connecting rod is engaged with the limiting cap, and the other end of the connecting rod is provided with threads.

4. The bidirectional driving mechanism for electric scissors blades according to claim 3, wherein a rotating shaft hole A is provided in a front part of the meshing block (33), a rotating shaft hole B is provided in a rear part of the upper blade (32), a rotating shaft hole C is provided in a middle part of the lower blade (21), and the rotating shaft hole A, the rotating shaft hole B and the rotating shaft hole C all rotate around the rotating shaft member (40).

5. The bidirectional driving mechanism for electric scissors blades according to claim 1, wherein the first protrusion is arranged at a front upper side of the shaft hole A, and the second protrusion is arranged at a front upper side of the shaft hole B.

6. The bidirectional driving mechanism for electric scissors blades according to claim 1, wherein the outer rack (21) and the inner rack (31) are of arc-shaped structures.

7. The bidirectional driving mechanism for electric scissors blades according to claim 1, wherein a gear hole is provided in the fixed seat (10), a deep groove bearing (12) is connected in the gear hole (11), and a pin shaft of the driving gear (50) is in running fit with the deep groove bearing (12).

8. An electric scissors, comprising the bidirectional driving mechanism for electric scissors blade according to claims 1 to 7, comprising a driving assembly, wherein an output end of the driving assembly is dynamically connected to the pin shaft of the driving gear (50) to drive the driving gear (50) to rotate.