Patent Description:
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: <NUM>, 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:.

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.

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.

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

<CIT> 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.

<CIT>Discloses 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 <NUM> is rotatably mounted on second lever member <NUM> and spacer <NUM> of second lever member <NUM>, respectively. The gear wheel <NUM> is supported on the one hand on a toothed section <NUM> of the first lever element <NUM> or a toothed section <NUM> of the spacer <NUM> of the first lever element <NUM> and on the other hand on a toothed section <NUM> of the second cutting element <NUM> or a toothed section <NUM> of the lever arm <NUM> of the second cutting element <NUM>.

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

The present invention is defined by a bidirectional driving mechanism for electric scissors blades according to independent claim <NUM>.

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.

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.

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.

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.

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

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.

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.

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.

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.

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

Referring to <FIG>, the present disclosure provides a bidirectional driving mechanism for electric scissors blades, including a fixed seat <NUM>, a driving gear <NUM>, a rotating shaft member <NUM>, an upper blade group <NUM> and a lower blade <NUM>. The driving gear <NUM> and the rotating shaft member <NUM> are arranged on the fixed seat <NUM>, the lower blade <NUM> and the upper blade group <NUM> rotate around the rotating shaft member <NUM>, an outer rack <NUM> is arranged at a rear part of the lower blade <NUM>, a front part of the upper blade group <NUM> is an upper blade <NUM>, a rear part of the upper blade group <NUM> is a meshing block <NUM>, and an inner rack <NUM> is arranged at a rear part of the meshing block <NUM>; and the inner rack <NUM> and the outer rack <NUM> are respectively meshed with both sides of the driving gear <NUM>.

The driving gear <NUM> and the rotating shaft member <NUM> are arranged on the fixed seat <NUM>, and the rotating shaft member <NUM> makes the upper blade group <NUM> and the lower blade <NUM> rotate around it. Moreover, the meshing block <NUM> is arranged, the inner rack <NUM> is arranged at the rear part of the meshing block <NUM>, the inner rack <NUM> faces the outer rack <NUM> at the rear part of the lower blade <NUM>, and both sides of the driving gear <NUM> are meshed with the inner rack and the outer rack <NUM> respectively. Through this structure, the inner rack <NUM> and the driving gear <NUM> are located behind the outer rack <NUM>, and there is no need to provide a position for mounting the driving gear between the upper blade <NUM> and the lower blade <NUM>, such that the thickness is reduced. In addition, when driving, the driving gear <NUM>, the upper blade <NUM> and the lower blade <NUM> all rotate in a circumferential direction in the same plane, and the situation that the upper blade <NUM> and the lower blade <NUM> open outwards since the circumferential rotation of the gear and the circumferential rotation of the upper blade <NUM> and the lower blade <NUM> 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.

Further, as shown in <FIG> and <FIG>, the rotating shaft member <NUM> includes a stop screw <NUM> and a nut <NUM>, a rotating shaft hole D is provided in the fixed seat <NUM>, and the stop screw <NUM> passes through the rotating shaft hole D and is in threaded connection with the nut <NUM>.

Further, as shown in <FIG> and <FIG>, the stop screw <NUM> 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 <NUM> and the nut <NUM> are arranged, and the stop screw <NUM> includes the connecting rod and the limiting cap, such that the detachable property is realized.

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

Further, as shown in <FIG>, a first protrusion <NUM> is arranged at the front part of the meshing block <NUM>, and the pin hole E is located at the first protrusion <NUM>; a second protrusion <NUM> is arranged at the rear part of the upper blade <NUM>, and the pin hole F is located at the second protrusion <NUM>; and suitable positions are provided for the pin holes.

Further, as shown in <FIG>, the first protrusion <NUM> is arranged at a front upper side of the shaft hole A, and the second protrusion <NUM> is arranged at a front upper side of the shaft hole B. With this position structure, when the meshing block <NUM> drives the pin <NUM> to operate, a moving path of the pin <NUM> is just toward a connecting line between the rotating shaft hole of the upper blade <NUM> and the pin hole. During this process, the pin <NUM> swings by being vertically against the upper blade <NUM>. With this arrangement, the wear between the pin <NUM> 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.

Further, as shown in <FIG>, the outer rack <NUM> and the inner rack <NUM> are of arc-shaped structures; and the centers of circles corresponding to arcs of the outer rack <NUM> and the inner rack <NUM> are made correspond to a center line of the rotating shaft member <NUM>, so as to realize close meshing with the driving gear <NUM>.

Further, as shown in <FIG> and <FIG>, a gear hole <NUM> is provided in the fixed seat <NUM>, a deep groove bearing <NUM> is connected in the gear hole <NUM>, and a pin shaft of the driving gear <NUM> is in running fit with the deep groove bearing <NUM>, so as to realize rotation of the driving gear <NUM>.

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 <NUM> to drive the driving gear <NUM> to rotate, and the rotation of the driving gear <NUM> drives the outer rack <NUM> and the inner rack <NUM> to rotate synchronously, such that the upper blade <NUM> and the lower blade <NUM> swing up and down to complete shearing.

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:.

Referring to <FIG>, a bidirectional driving mechanism for electric scissors blades includes a fixed seat <NUM>, a driving gear <NUM>, a rotating shaft member <NUM>, an upper blade group <NUM> and a lower blade <NUM>. The driving gear <NUM> and the rotating shaft member <NUM> are arranged on the fixed seat <NUM>, the lower blade <NUM> and the upper blade group <NUM> rotate around the rotating shaft member <NUM>, an outer rack <NUM> is arranged at a rear part of the lower blade <NUM>, a front part of the upper blade group <NUM> is the upper blade <NUM>, a rear part of the upper blade group <NUM> is a meshing block <NUM>, and an inner rack <NUM> is arranged at a rear part of the meshing block <NUM>; and the inner rack <NUM> and the outer rack <NUM> are respectively meshed with both sides of the driving gear <NUM>. The rotating shaft member <NUM> includes a stop screw <NUM> and a nut <NUM>, a rotating shaft hole D is provided in the fixed seat <NUM>, and the stop screw <NUM> passes through the rotating shaft hole D and is in threaded connection with the nut <NUM>. The stop screw <NUM> 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 <NUM> to rotate, under the rotation of the driving gear <NUM>, the bidirectional driving mechanism for electric scissors blade drives the inner rack <NUM> and the outer rack <NUM> to swing, thereby driving the upper blade <NUM> and the lower blade <NUM> to shear. When a part is damaged, the nut <NUM> is loosened, the mechanism is entirely disassembled to replace the damaged part.

As shown <FIG>, a bidirectional driving mechanism for electric scissors blades includes a fixed seat <NUM>, a driving gear <NUM>, a rotating shaft member <NUM>, an upper blade group <NUM> and a lower blade <NUM>. The driving gear <NUM> and the rotating shaft member <NUM> are arranged on the fixed seat <NUM>, the lower blade <NUM> and the upper blade group <NUM> rotate around the rotating shaft member <NUM>, an outer rack <NUM> is arranged at a rear part of the lower blade <NUM>, a front part of the upper blade group <NUM> is an upper blade <NUM>, a rear part of the upper blade group <NUM> is a meshing block <NUM>, and an inner rack <NUM> is arranged at a rear part of the meshing block <NUM>. The inner rack <NUM> and the outer rack <NUM> are respectively meshed with both sides of the driving gear <NUM>. The rotating shaft member <NUM> includes a stop screw <NUM> and a nut <NUM>, a rotating shaft hole D is provided in the fixed seat <NUM>, and the stop screw <NUM> passes through the rotating shaft hole D and is in threaded connection with the nut <NUM>. The stop screw <NUM> 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 <NUM>, a rotating shaft hole B is provided in a rear part of the upper blade <NUM>, a rotating shaft hole C is provided in a middle part of the lower blade <NUM>, and the rotating shaft hole A, the rotating shaft hole B and the rotating shaft hole C all rotate around the rotating shaft member <NUM>. A pin hole E is also provided in the front part of the meshing block <NUM>, a pin hole F is provided in the rear part of the upper blade <NUM>, and a pin <NUM> is connected in both the pin hole E and the pin hole F. In practical applications, the driving assembly drives the driving gear <NUM> to rotate, under the rotation of the driving gear <NUM>, the bidirectional driving mechanism for electric scissors blade drives the inner rack <NUM> and the outer rack <NUM> to swing, thereby driving the upper blade <NUM> and the lower blade <NUM> to shear. When a part is damaged, the nut <NUM> is loosened, the mechanism is entirely disassembled to replace the damaged part. If the meshing block <NUM> or the upper blade <NUM> is damaged, the pin <NUM> is knocked out with a nail or similar tool, and then the meshing block <NUM> or the upper blade <NUM> is replaced.

Claim 1:
A bidirectional driving mechanism for electric scissors blades, comprising a fixed seat (<NUM>), a driving gear (<NUM>), a rotating shaft member (<NUM>), an upper blade group (<NUM>) and a lower blade (<NUM>), wherein the driving gear (<NUM>) and the rotating shaft member (<NUM>) are arranged on the fixed seat (<NUM>), the lower blade (<NUM>) and the upper blade group (<NUM>) rotate around the rotating shaft member (<NUM>), an outer rack (<NUM>) is arranged at arear part of the lower blade (<NUM>), a front part of the upper blade group (<NUM>) is an upper blade (<NUM>), a rear part of the upper blade group (<NUM>) is a meshing block (<NUM>), and an inner rack (<NUM>) is arranged at a rear part of the meshing block (<NUM>); and the inner rack (<NUM>) and the outer rack (<NUM>) are respectively meshed with both sides of the driving gear (<NUM>); a pin hole E is provided in the front part of the meshing block (<NUM>), a pin hole F is provided in the rear part of the upper blade (<NUM>), and a pin (<NUM>) 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 (<NUM>), 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 (<NUM>), and the pin hole F is located at the second protrusion.