WO2023036826A1

WO2023036826A1 - Device and method for pruning a branch

Info

Publication number: WO2023036826A1
Application number: PCT/EP2022/074875
Authority: WO
Inventors: François VERMOND
Original assignee: VERMOND, Hédéric
Priority date: 2021-09-07
Filing date: 2022-09-07
Publication date: 2023-03-16
Also published as: FR3124416B1; FR3124416A1

Abstract

The invention relates to a device for pruning (100) a branch (101), said device comprising a cutting strip (102) rotated by a motor (103) and also comprising: - two blades (104, 105) connected by a return means (106), the branch being inserted between the two blades; - a means (107) for detecting the separation between the two blades; and - a means (108) for activating and/or deactivating the motor based upon the detected separation. The present invention also relates to a method for pruning a branch implemented by such a device.

Description

DEVICE AND METHOD FOR PRUNING A BRANCH

Technical field of the invention

The present invention relates to a pruning device. It applies, in particular, to the field of maintenance of green spaces.

State of the art

For the maintenance of green spaces, solutions of the prior art consist in using saber saws, chainsaws or electric pole saws. Such saws are started arbitrarily, disregarding safety considerations for the user and/or others in the vicinity. Some of these saws have a guiding aid during the cut, but their effectiveness depends on the chain guide.

Thus, there is currently no secure device for carrying out the action of pruning a branch of a tree or shrub.

Disclosure of Invention

The present invention aims to remedy all or part of these drawbacks.

To this end, according to a first aspect, the present invention relates to a device for pruning a branch which comprises a cutting blade driven in rotation by a motor, the device further comprising:

- two blades connected by a return means, the branch being inserted between the two blades,

- a means of detecting the separation of the two blades and

- a means of activating and/or deactivating the motor according to the distance detected.

Thanks to these provisions, the rotation of the cutting tape is triggered only when the branch is inserted between the two blades and causes the separation of the two blades. Thus, the security of the device is reinforced. In addition, the device makes it possible to hold the branch between the two blades and thus to guide pruning.

In embodiments, the device comprises a contactor which, in a first state, corresponds to a close position of a blade vis-à-vis another blade and, in a second state, corresponds to a position far from a blade vis-à-vis another blade, the activation and/or deactivation means being configured to activate the motor according to the state of the contactor.

Thanks to these provisions, the activation of the motor is carried out by the interruption of the direct contact between the two blades. Thus, the triggering of the device is controlled directly by the contactor.

In embodiments, the device comprises: - a capacitive or inductive sensor configured to measure a value representative of the positioning of at least one blade and

- the means for detecting the gap between the two blades comprising a means for calculating a value representative of a gap distance between the two blades as a function of the sensed position.

Thanks to these provisions, the device allows precise detection of the positioning of the blades and therefore of the spacing distance of the blades. Thus the sensitivity of the detection of a separation distance is increased. The separation distance thus detected will be more precise and will allow more adequate triggering of the device when this distance is greater than a predetermined maximum separation distance. In addition, the chain drive speed can directly depend on the spacing distance between the blades, itself representative of the size of the branch to be pruned.

In embodiments, the device comprises:

- an optical sensor configured to measure a value representative of the positioning of at least one blade and

Thanks to these provisions, the device allows precise detection of the positioning of the blades and therefore of the spacing distance of the blades. Detection is also more stable and independent of the projection surface of the optical sensor. In addition, the chain drive speed can directly depend on the spacing distance between the blades, itself representative of the size of the branch to be pruned.

In some embodiments, the device further comprises three means for driving the cutting blade in rotation having parallel and non-coplanar axes of rotation, the cutting blade forming a triangle around the rotating means, the triangle delimiting an internal space and an external space.

Thanks to these provisions, the accessibility to the different cutting angles by the user is increased. Thus, the use of the device is facilitated. Furthermore, if the blades and the handle of the device are aligned, these arrangements allow the user to perform an upward vertical movement without having to perform a rotational movement with the handle.

In some embodiments, the device comprises a frame positioned in the outer space of the triangle covering two sides of the triangle, the frame comprising a free section positioned facing the third side of the triangle, each blade being:

- oriented from the internal space of the triangle towards the free section, outside the internal space of the triangle and

- configured to guide the branch to the cutting tape. Thanks to these arrangements, the overlapping of two sides of the triangle formed by the chain reduces the risk of cuts at these sides when the device is in use.

In embodiments, a portion of each slat, positioned in the outer space of the triangle, is configured to be positioned in abutment against an outline of the free section in a position of maximum separation of the slats.

Thanks to these provisions, the device allows a progressive, even total, covering of the third side of the triangle formed by the cutting tape. Thus, the final cover prevents a user from reaching the internal space of the triangle formed by the cutting tape. The risk of injury to the three sides formed by the chain is therefore reduced, safety is thus improved.

In embodiments, the return means comprises at least one rigid element connecting the two blades, the two blades being deformable and configured to:

- be deformed when inserting the branch between the two blades and

- forming the recall means.

Thanks to these provisions, the device allows a spacing of the two blades by the deformation of the two blades when the branch is inserted. In addition, the two blades are brought back into contact by returning the blades to their initial position when the branch is completely cut. Bringing the two blades back into contact thus activates the motor deactivation means.

In some embodiments, the return means comprises at least one spring configured to bring the two blades together when inserting the branch between the two blades.

Thanks to these provisions, the separation of the two blades is achieved by tensioning the spring bringing the two blades closer together when the branch is inserted. In addition, the two blades are brought back into contact by the return force of the spring when the branch is completely cut. Bringing the two blades back into contact thus activates the motor deactivation means.

In some embodiments, the device that is the subject of the invention further comprises a handle for gripping the user.

Thanks to these provisions, the device is suitable for direct and easy use by a physical user, without complete automation. In particular, the device allows a user to manually orient the blades according to the position of the branch to be pruned.

In some embodiments, the device that is the subject of the invention further comprises an extension.

Thanks to these provisions, the device makes it possible to reach branches to be pruned at a distance, such as a height, greater than the distance, such as a height, that can be reached by the device without an extension. Thus, a user reaches branches to be pruned having a significant height, without having to climb a ladder and take risks. For example, the risk of falling is therefore limited. Furthermore, the user reaches a branch to be pruned arranged at a predetermined distance, for example a safety distance, thus preventing the user from being too close to the branch or below. The security of the device is thus reinforced. Finally, such an extension also makes it possible to orient the blades from a distance according to the arrangement of the branch to be pruned.

In embodiments, the extension is telescopic.

Thanks to these provisions, the length of the device is easily adjustable according to the needs of the user.

According to a second aspect, the present invention relates to a method for pruning a branch by a pruning device, which comprises:

- a step of inserting the branch between two blades of the device,

- a step of detecting the gap between the two blades of the device and, depending on the gap detected,

- a motor activation step or

- a motor deactivation step.

The aims, advantages and particular characteristics of the method which is the subject of the present invention being similar to those of the device which is the subject of the present invention, they are not repeated here.

Brief description of figures

Other advantages, aims and particular characteristics of the invention will emerge from the non-limiting description which follows of at least one particular embodiment of the device and of the method which are the subject of the present invention, with reference to the appended drawings, in which:

FIG. 1 schematically represents a first particular embodiment of the device which is the subject of the present invention,

FIG. 2 schematically represents the same embodiment of the device which is the subject of the present invention represented in FIG. 1 when the device is in operation,

FIG. 3 schematically represents a second particular embodiment of the device which is the subject of the present invention,

FIG. 4 schematically represents the same embodiment of the device which is the subject of the present invention represented in FIG. 3 when the device is in operation,

FIG. 5 schematically represents a third particular embodiment of the device which is the subject of the present invention,

FIG. 6 schematically represents the same embodiment of the device which is the subject of the present invention represented in FIG. 5 when the device is in operation,

FIG. 7 schematically represents a fourth particular embodiment of the device which is the subject of the present invention and

FIG. 8 represents, schematically and in the form of a flowchart, a particular succession of steps of the method which is the subject of the invention. Description of embodiments

This description is given on a non-limiting basis, each characteristic of an embodiment being able to be combined with any other characteristic of any other embodiment in an advantageous manner.

We recall here the following definitions:

The term “blade” refers to any mechanical element whose purpose is to serve as a guide for a branch corresponding to a determined template. Such a blade has for example a generally elongated shape.

The activation and/or deactivation means designates an electronic component or software, configured to emit a positive command corresponding to an activation or deactivation action or only a positive command for one of these actions, the other action corresponding to an absence of a command sent.

The term "flexible" refers to a deformable element, formed, for example, of a deformable material.

The term "rigid" refers to an element of constant shape, resistant to torsion or shearing, formed for example of a non-deformable material.

The terms "cutting tape" refer to an element forming a cutting surface by displacement in translation, and designate for example a notched tape or a chain.

It is noted that a spacing distance of the two blades is a physical quantity representative of a spacing of the two blades.

Throughout the description, "upper" means everything that is at the top in Figures 1 to 7, "lower" everything that is at the bottom in Figures 1 to 7, the terms "vertical" or "height" derive from these definitions. The devices illustrated in Figures 1 to 7 generally have a vertical plane of symmetry (perpendicular to the plane of the figures) numbered 119. The intersection between the vertical plane of symmetry 119 and the plane of the figures defines an axis of symmetry.

Note that the figures are not to scale.

A diagrammatic view of an embodiment of the device 100 object of the present invention is observed in FIG. 1, which is not to scale. There is seen in Figure 2, which is not to scale, a schematic view of an embodiment of the device 100, shown in Figure 1, when the device 100 is in operation. The device 100 for pruning a branch comprises a cutting blade 102 driven in rotation by a motor 103 and further comprises:

- two blades, 104 and 105, connected by a return means 106, the branch 101 being inserted between the two blades, 104 and 105,

- a detection means 107 of separation of the two blades, 104 and 105, and

- A means of activation or deactivation 108 of the motor 103 according to the distance detected.

In embodiments, the cutting tape 102 is a serrated tape. The notches present on the notched tape are configured to cut the branch when the tape is in translational movement. In variants, the cutting band 102 is a chain having cutting teeth.

At least one blade, 104 and/or 105, 204 and/or 205, is, for example, a flat and elongated strip, comprising, for example:

- a length, a width and a thickness, the value of the length being greater than that of the width itself greater than that of the thickness and

- two contact surfaces, each contact surface being delimited by the length and the width.

At least one blade, 104 and/or 105, 204 and/or 205, is movable relative to the other blade, 104 and/or 105, 204 and/or 205. In variants, each blade, 104 and 105, 204 and 205, is mobile.

In embodiments, as shown in Figures 1 and 2, the two blades, 104 and 105, are made of deformable material. Preferably, the deformable material constituting the blades is a stainless metal or an alloy. Note that the two blades, 104 and 105, are symmetrical with respect to the plane of symmetry 119. In embodiments, the blades, 104 and 105, form a single piece. The blades, 104 and 105, are connected by their internal end thus forming the return means 106.

It is observed in Figures 1 and 2 that the two blades, 104 and 105, are connected by a rigid connection element 109 thus included in the return means 106. For example, the rigid element 109 is a ring surrounding the two blades , 104 and 105.

It is observed, in Figure 1, that the initial position of the blades, 104 and 105, is configured to ensure direct contact between the two blades, 104 and 105, by action of the rigid element 109. When the branch 101 is completely cut, the blades, 104 and 105, are brought back into contact thus triggering the shutdown of the system.

In embodiments, as shown in Figures 3 to 6, the two blades, 204 and 205, are made of rigid material. For example, the rigid material is a composite material comprising carbon fibers. It is noted that the two blades, 204 and 205, are symmetrical with respect to the plane of symmetry 119. The two blades, 204 and 205, are connected by a return means 206. Preferably, the return means 206 is a tension spring , for example helical. In variants, the spring 206 is a torsion spring.

In embodiments (not shown), the return means 206 of the two blades, 204 and 205, comprises two pivot springs, each interacting with one of the two blades, 204 and 205. For example, each pivot spring is located on an outer side of the two blades. The pivot springs are symmetrical with respect to the plane 119. In variants, each pivot spring is incorporated on a single and same pivot located on the internal end of the two blades on 204 or 205. These pivot springs are configured to allow the blades, 204 and 205, to pivot when the branch is inserted. Indeed, when the blades, 204 and 205, pivot, the outer ends of the blades 204 and 205 move further and further away in order to carry out a continuous pruning of the branch. In embodiments (not shown), the return means is a blade drive means such as a gear for holding the two blades, 204 and 205. This return means is configured to allow the blades, 204 and 205, to pivot when the branch is inserted. Note that the pivot of the two blades is simultaneous when a branch is inserted. Thus, such a gear is configured to maintain a distance value of a blade relative to the axis of symmetry 119 equal to half the distance between the two blades, 204 and 205.

In embodiments (not shown), the blades are deformable and connected by a spring. The recall means is thus configured to provide the device with greater flexibility.

The detection means, 107, 207, can be of several types. The function of this detection means, 107, 207, is to determine a gap between the blades, 104 and 105. The determination mechanism depends on the operating conditions desired for the device. Figures 1 to 6 illustrate several embodiments of this detection means.

In embodiments, as represented in FIGS. 1 and 2, the device 100 comprises the contactor 121 which interacts with the activation and/or deactivation means 108 via the detection means 107.

In embodiments, as represented in FIGS. 1 and 2, the detection means 107 is, for example, an electric device configured to detect a voltage and/or an electric current at the terminals of the contactor 121 . When no voltage and/or no current is detected, the detection means 107 detects a separation of the blades, 104 and 105.

In embodiments, as represented in FIGS. 1 and 2, the contactor 121 comprises two parts, each part being located on a blade, 104 or 105. The contactor, in a first state, corresponds to a position close to a blade, 104 and 105, vis-à-vis another blade, 104 and 105, as shown in Figure 1, and, in a second state, corresponds to a position away from a blade, 104 and 105, screw -to-vis another blade, 104 and 105, as shown in Figure 2. The close position is associated with a first spacing distance between the two blades, 104 and 105, and the remote position is associated with a second position between the two blades, 104 and 105, greater than the first distance.

In embodiments, the contactor 121 includes a magnet (not shown) configured to connect the two parts of the contactor when the two blades are in the close position.

In embodiments (not shown), sensing means 107 includes a strain gauge located on each blade, 104 and 105, and comparison means. The strain gauges are configured to detect a bending value of the blades, 104 and 105, corresponding to a deformation value. The spacing distance of the two blades, 104 and 105, is thus associated with the bending value of the blades, 104 and 105. The comparison by the comparison means is carried out between the bending detection value of the blades, 104 and 105 , and the value predetermined limit of flexion of the blades, 104 and 105. For example, the comparison means is a microprocessor executing a comparison program. When the deflection detected by the strain gauges is greater than the predetermined limit value of deflection of the blades, 104 and 105, the drive motor 103 is triggered.

In embodiments, as represented in FIGS. 3 and 4, the detection means

207 includes means 208 for calculating a value representative of a spacing distance between the two blades as a function of the position sensed by a capacitive or inductive sensor 209. It can be seen in FIGS. 3 and 4 that the capacitive sensor or inductive is located on blade 204.

When the sensor 209 is a capacitive sensor, the capacitive sensor 209 is configured to measure small displacement variations. Thus the capacitive detector 209 makes it possible to increase the detection sensitivity of the system.

When the sensor 209 is an inductive sensor, the inductive sensor is configured to measure displacement variations of an electrically conductive object. The blades, 204 and 205, therefore comprise a conductive material, in such variants.

In embodiments (not shown), a sensor 209 is present on at least one of the ends, 114 or 115, of the frame 113. The sensor 209 is thus separated from the blades, 204 and 205.

In embodiments, as represented in FIGS. 3 and 4, the calculation means

208 of a value representative of a spacing distance between the two blades, 204 and 205, depending on the sensed position is, for example, a microprocessor executing a calculation program.

In embodiments, as represented in FIGS. 5 and 6, the detection means 207 comprises means 208 for calculating a value representative of a spacing distance between the two blades as a function of the position detected by a optical sensor 309 which is, for example, a laser placed on the blade 204.

In embodiments, as represented in FIGS. 5 and 6, the calculation means 208, included in the detection means 207, is a rangefinder.

In embodiments (not shown), a sensor 309 is present on at least one of the ends, 114 or 115, of the frame 113. The sensor 309 is thus separated from the blades, 204 and 205.

Of course, these embodiments of the sensor, 209 and 309, and of the detection means 207 can also be applied in the frame of blades, 104 and 105, represented in FIGS. 1 and 2.

In embodiments, as represented in FIGS. 1 to 6, the motor activation or deactivation means 108 is a microcontroller. An activation means is configured to activate the motor according to the signal received by the detection means 207. On the contrary, a deactivation means is configured to deactivate the motor according to the signal received by the detection means 207. Motor activation and deactivation means 108 is configured to perform these two functions.

In embodiments, the activation means 108 also includes a regulation means (not shown). This regulating means is configured to regulate the speed of rotation in proportion to the gap detected between the two blades. Thus, the drive speed of the cutting blade depends directly on the gap between the blades.

In embodiments, as represented in FIGS. 1 to 6, the device comprises a grip handle 120. For example, the handle 120 is a tube comprising the longitudinal plane of symmetry 119 . It is observed, in Figure 1, that one of the planes 119 of symmetry of the handle 120 coincides with the plane 119 of symmetry of the blades, 104 and 105.

In embodiments, the handle 120 includes an ergonomic grip (not shown) configured to increase user comfort when pruning the branch.

In embodiments, such as that shown in Figure 7, the device 500 includes an extension 122. For example, the extension 122 is a pole. For example, the extension 122 is a tube comprising the plane of symmetry 119 longitudinal.

In embodiments, extension 122 includes a handle for gripping a user.

In embodiments, the extension is telescopic. In particular, when the extension 122 is telescopic, the extension 122 comprises elements that fit together and slide into each other, thus making it possible to modify the length of the extension 122 and therefore of the device 500 as needed.

In some embodiments, the lower end of the handle 120 of the device 500 comprises a tip allowing connection to the extension 122. For example, the tip of the lower end of the handle 120 is a male part connected to a female located on extension 122, or vice versa. For example, the connection is made by screwing, clipping or ratcheting the male part into the female part. In variants, the connection between the lower end of the handle 120 and the extension 122 is made by an intermediate connection 123.

In embodiments (not shown), the extension has at least two parts connected by an elbow. Preferably, the device comprises a means for adjusting the angle of the elbow. Thus, a greater plurality of orientation of the device vis-à-vis the branch to be pruned is obtained. This increases the flexibility of the device and allows easier use.

In embodiments, as shown in Figures 1 to 6, the drive motor 103 is incorporated into the handle 120 of the device. In embodiments, the drive motor 103 is electrically powered. The electrical energy for the operation of the motor comes, for example, from an autonomous electrical power source or from an electrical outlet connected to the mains and connected to the device by an electrical cable.

In embodiments, the drive motor 103 is a heat engine. Preferably, the heat engine is a two-stroke engine. In these modes of In this embodiment, the device 100 comprises a gasoline tank and a means of converting gasoline into thermal energy known to the person skilled in the art.

In embodiments (not shown), the device further comprises a handle which includes a manual motor activation means located on the handle 120. Preferably, the manual activation means is an on/off switch ( in English “on/off”).

In variants, the manual activation means comprises a pressure switch or a double trigger system known to the person skilled in the art. The pressure switch is configured to trigger the motor when the user's hand exerts pressure on the handle and a branch pushes the two blades apart. The dual trigger system is configured to fire the motor when the user presses both triggers simultaneously and a branch pushes the two blades apart.

Thus, the motor is operated when the manual activation means is actuated and the motor activation means is activated. The activation of the motor is therefore carried out according to an additional means depending on the presence of the user of the device. When the manual activation means is a double trigger system, if the user accidentally releases the device while pruning a branch, the drive motor is deactivated.

In embodiments, as shown in Figures 1 to 6, the device, 100, 200, 300, comprises three means for driving in rotation, 110, 111 and 112, the cutting tape 102. Preferably, the three means rotation drive, 110, 111 and 112, respectively have parallel axes of rotation, 116, 117 and 118. Even more preferably, the three rotation drive means, 110, 111 and 112, respectively have axes of non-coplanar rotation, 116, 117 and 118.

It is observed in Figures 1 to 6 that the three drive means, 110, 111 and 112, delimit a triangle, preferably substantially equilateral. The axis of rotation 118 of the drive means 112 is in the plane 119. The axes, 116 and 117, respectively of the drive means, 110 and 111, are parallel and symmetrical with respect to the plane 119. The triangle is formed by the cutting tape 102 surrounding these three drive means, 110, 111 and 112. The triangle delimits two spaces, the first space is called “internal” space and the second space is called “external” space. The "internal" space corresponds to the closed surface surrounded by the triangle while the "external" space corresponds to the exterior of this surface. By extension, we say that a structural element is "oriented from internal space to external space" when the orthogonal projection of this element on the plane 119 crosses the triangle.

The nature of the three rotation drive means, 110, 111 and 112, depends on the size of the device. The size of the branch to be pruned determines the size of the device to be used. We will speak of “small-scale use” when the device is used by an individual in order to prune branches of small diameter. We will speak of “large-scale use” when the device is used to prune branches of large diameter. In the context of use on a small scale, the three rotation drive means, 110, 111 and 112, are, for example, three toothed pulleys and the cutting tape 102 is a toothed tape. It is noted that these three notched pulleys, 110, 111 and 112, are configured to drive the notched ribbon 102. The rotation of the three pulleys, 110, 111 and 112, therefore causes the translation of the ribbon 102. In other words, a triangle cutting edge is formed by the notched tape. Preferably, the thickness of the pulleys is between 2 and 5 centimeters.

In the context of large-scale use, the three rotation drive means, 110, 111 and 112, are, for example, three toothed wheels and the cutting tape 102 is a chain. Preferably, the three toothed wheels, 110, 111 and 112, are pinions. Note that these three toothed wheels, 110, 111 and 112, are configured to engage the chain 102. The rotation of the three toothed wheels, 110, 111 and 112, therefore causes the translation of the chain 102. In other words, a cutting triangle is formed by the chain.

In variants, the drive motor 103 is connected only to the drive means 112 closest to the handle 120. When the motor 103 is in operation, the drive means 112 is driven in rotation by the motor 103. Thus , when the drive means 110, 111 and 112 are toothed wheels, the toothed wheel 112 is driving. The toothed wheel 112 therefore sets in motion the cutting blade 102 which causes the rotation of the toothed wheels, 110 and 111.

In embodiments, as represented in FIGS. 1 to 6, the devices 100, 200 and 300 comprise a frame 113 positioned in the external space of the triangle covering two sides of the triangle, the frame 113 comprising a free section positioned in look at the third side of the triangle. The frame 113 thus also delimits its own internal space and external space. The internal space corresponds to a functional, safety space, allowing the useful parts of the devices, 100, 200 and 300, to operate inside the device, 100, 200 and 300. Thus, the frame 113 is configured to avoid that a part of the human body comes into contact with the cutting tape 102 on both sides of the triangle, since the cutting tape 102 is partially isolated in the safety space delimited by the frame 113.

In embodiments, as represented in FIGS. 1 to 6, the covering of the cutting tape 102 on two sides of the triangle is carried out by two branches symmetrical with respect to the plane 119. The two branches intersect in the plane 119. The intersection of the two branches in the plane 119 is in alignment with the vertex of the triangle included in the plane 119. The two branches have a thickness configured to cover the cutting tape 102. Preferably, these two branches form covering channels , the chain 102 is present in the middle of these tubes without touching the internal walls of the tubes.

In embodiments, as shown in Figures 1 to 6, the cover frame 113 extends by ends, 114 and 115, on the two ends of the free portion positioned opposite the third side of the triangle. In embodiments, as shown in Figures 1 to 6, it is observed that each blade, 104 and 105, 204 and 205, is oriented from the internal space to the external space, crossing the free section. In other words, each blade, 104 and 105, 204 and 205, is oriented from the internal space of the triangle towards the free section, outside the internal space of the triangle. Thus, we define:

- one end of each blade, 104 and 105, 204 and 205, in the "internal" space by the triangle formed by the cutting tape 102, called the "internal" end and

- the other end of each blade, 104 and 105, 204 and 205, in the "external" space of the triangle, called the "external" end. Each "external" end of the blades, 104 and 105, 204 and 205, therefore correspond to a blade portion which extends beyond the third side of the triangle positioned opposite the free section of the frame 113. Preferably, the length of the portion of each "external" end of the two blades, 104 and 105, 204 and 205, is greater than the diameter of the branch, 101, 201, to be cut.

In Figures 2, 4 and 6 are respectively shown the devices, 100, 200, 300, in operation.

It is observed in Figures 2, 4 and 6, that initially, the branch 101 is present in the external space delimited by the triangle formed by the cutting tape 102. During pruning, the branch 101 comes into contact with the triangle formed by the cutting tape 102. This contacting of the branch 101 corresponds to a contacting with the cutting tape 102, driven by the three drive means 110, 111 and 112. Pruning begins when the contact between the cutting blade 102 and the branch 101 is present.

It is observed in Figures 2, 4 and 6 that the handle 120 is configured for the realization of an upward pruning movement by the user when pruning the branch. Thus, the force exerted by the user with the handle 120 is oriented and in the same direction as the pruning movement of the branch 101. Moreover, this force is included not only in the cutting plane of the branch 101 but also in the plane of symmetry 119 between the two blades, 104 and 105, 204 and 205. The orientation of the force exerted by the user is therefore optimal. In addition, the combination of pruning guidance by the action of the two blades, 104 and 105, 204 and 205, on the branch, 101, 201, and the orientation of the handle 120 improves the positioning of the device, 100, 200, 300, when pruning. Thus, the use of the device, 100, 200, 300, for pruning the branch, 101, 201, is facilitated. It is noted in Figures 2, 4 and 6 that the branch, 101, 201, is positioned and held opposite the device, 100, 200, 300, during pruning.

It is observed, in FIG. 2, that the blades, 104 and 105, of the device 100 are deformed by the insertion of the branch 101. The deformation of the two blades, 104 and 105, thus causes them to move apart. The spacing between the two blades, 104 and 105, is represented by a double arrow. It is also noted that the outer ends of the blades are configured for guiding the branch 101 to the cutting tape 102. It is observed, in Figure 2, that the return means 106 is formed by the assembly of the two blades, 104 and 105, as well as the rigid ring 109. The rigid ring 109 is configured to hold the two blades, 104 and 105 , in contact at their inner ends. Thus, the deformation of the two blades, 104 and 105, is reversible. Indeed, when the branch 101 is completely cut the two blades, 104 and 105, return to their initial position, since the obstacle between the blades, 104 and 105, causing the separation of the two blades, 104 and 105, is eliminated.

It is noted that the contactor 121, shown in Figures 1 and 2, is configured to interact with the activation or deactivation means 108 via the detection means 107. Indeed, the activation or deactivation means 108 is configured to activate the motor 103 according to the state of the contactor 121. There are two possible states for the contactor, and therefore two possible effects.

The first effect, linked to the state of the contactor 121, is obtained when the contactor is in a first state, corresponding to a close position of a blade, 104 and 105, vis-à-vis another blade, 104 and 105. When the two blades, 104 and 105, are in close position, a direct contact is present between the two blades, 104 and 105, is present, as illustrated in FIG. In other words, the gap distance between the two blades, 104 and 105, is less than a predetermined limit gap distance. In this case, contactor 121 is likened to an open switch that does not allow electrical current to pass. Thus the detection means sends no signal to the activation means 108, the drive motor 103 therefore remains stationary in this case.

The second effect, linked to the state of the contactor 121, is obtained when the contactor 121 is in a second state, corresponding to a position away from a blade, 104 and 105, vis-à-vis another blade, 104 and 105. When the two blades, 104 and 105, are in the remote position, the direct contact between the two blades, 104 and 105, is interrupted as illustrated in FIG. 2. In other words, the spacing distance between the two blades, 104 and 105, is greater than a predetermined limit gap distance. This interruption of contact between the two blades, 104 and 105, is obtained by inserting a branch 101 between the two blades, 104 and 105. In this case, the contactor 121 is likened to a closed switch allowing the current to pass. electric. Thus the detection means 107 sends a signal to the activation means 108 thus activating the drive motor 103.

Thus, it is observed in Figure 2, that the separation of the two blades, 104 and 105, following the insertion of the branch 101 causes the triggering of the motor 103. The motor 103 in operation rotates the three toothed wheels, 110, 111 and 112.

It is observed, in FIG. 2, that a portion of each blade, 104 and 105, positioned in the external space of the triangle, is configured to position itself in abutment against a contour, 114 and 115, of the free section in a maximum spread position of the blades when pruning the branch.

It is observed in Figures 4 and 6 that the insertion of the branch 201 causes the spacing of the blades, 204 and 205, of the devices, 200 and 300, and not their deformation. The distance between the two blades, 204 and 205, is represented by a double arrow. It is noted that the spring 206 is configured to bring the two blades, 204 and 205, closer together in order to maintain these two blades, 204 and 205, in the initial position. The branch 201 is thus held between the two rigid blades during pruning by the restoring force of the spring. Thus guiding the device during pruning is facilitated. When the branch 201 is completely cut, the two blades, 204 and 205, therefore return to their initial position. It is noted that this initial position is associated with a zero separation distance value.

It is noted, in FIG. 4, that the capacitive or inductive sensor 209 is configured to measure a value representative of the positioning of at least one blade, 204 and 205. It is observed in FIG. 4, that the two blades, 204 and 205, have moved away from their initial position illustrated in FIG. 3. When a branch 201 is inserted between the two blades, 204 and 205, the variation in the positioning of at least one blade, 204 and 205, is directly correlated to a increase in the spacing distance of the two blades, 204 and 205. Depending on the position sensed by the capacitive or inductive sensor 209, the calculation means 208 included in the detection means 207 performs the calculation of a value representing the distance between the two blades, 204 and 205. When this representative value is greater than a predetermined limit value, the detection means 207 sends a signal to the activation means 108 thus activating the drive motor 103.

It is noted, in FIG. 6, that the optical sensor 309 is configured to measure a value representative of the positioning of at least one blade, 204 and 205. For example, the optical sensor 309 is a laser. It is observed in Figure 6, that the two blades, 204 and 205, have moved away from their initial position illustrated in Figure 5. When a branch 201 is inserted between the two blades, 204 and 205, the variation in the positioning of at least one blade, 204 and 205, is directly correlated to an increase in the spacing distance of the two blades, 204 and 205. Depending on the position sensed by optical sensor 309, the calculation means 208 included in the means detection 207 performs the calculation of a value representative of the separation distance between the two blades, 204 and 205. When this representative value is greater than a predetermined limit value, the detection means 207 sends a signal to the activation means 108 thus activating the drive motor 103.

In FIG. 8, which is not to scale, there is a schematic view of an embodiment of the method 400 which is the subject of the invention in operation. The pruning method 400 of a branch comprises:

- a step 401 for inserting the branch between two blades of the device,

- a detection step 402 of the separation of the two blades of the device and, depending on the separation detected,

- a motor activation step 403 or

- A step 406 for deactivating the engine. During step 401 of the pruning method 400, illustrated in FIG. 8, the branch, 101, 201, to be pruned is inserted between the two blades, 104 and 105, 204 and 205, of the pruning device, 100, 200, 300. This insertion causes the separation of the two blades, 104 and 105, 204 and 205.

During step 402 of the pruning method 400, the spacing distance of the two blades, 104 and 105, 204 and 205, is, in this case, detected as being greater than a predetermined spacing distance.

During step 403 of the pruning process 400, the drive motor 103 is activated, driving the cutting tape 102. The cutting tape 102 is in contact with the branch, 101, 201, allowing the realization of the step 404 of pruning the branch, 101 , 201 . When the branch, 101, 201, is completely pruned, step 405 of the pruning process is carried out, corresponding to a return of the two blades, 104 and 105, 204 and 205, to their initial position. This initial position corresponds to a spacing distance between the two blades, 104 and 105, 204 and 205, less than a predetermined spacing distance. During step 406, the motor 103 is deactivated since the spacing distance between the two blades, 104 and 105, 204 and 205, is less than the predetermined spacing distance.

Preferably, the means of the devices 100, 200 and/or 300 are configured to implement the steps of the method 400 and their embodiments as explained above and the method 400 as well as its different embodiments can be put implemented by the means of the device 100, 200 and/or 300.

Claims

1. pruning device (100, 200, 300) of a branch (101, 201), which comprises a cutting tape (102) driven in rotation by a motor (103, 203), characterized in that it includes:

- two blades (104, 105, 204, 205) connected by a return means (106, 206), the branch being inserted between the two blades,

- a detection means (107, 207) of separation of the two blades and

- means for activating and/or deactivating (108) the motor according to the distance detected.

2. Device (100) according to claim 1, which comprises a contactor (121) which, in a first state, corresponds to a close position of a blade vis-à-vis another blade (104, 105) and , in a second state, corresponds to a remote position of a blade with respect to another blade, the activation and/or deactivation means (108) being configured to activate the motor (103) according the state of the contactor.

3. Device (200) according to one of claims 1 or 2, which comprises:

- a capacitive or inductive sensor (209) configured to measure a value representative of the positioning of at least one blade and

- the means of detecting (207) the spacing of the two blades comprising a means of calculating (208) a value representative of a spacing distance between the two blades as a function of the sensed position.

4. Device (300) according to one of claims 1 to 3, which comprises:

- an optical sensor (309) configured to measure a value representative of the positioning of at least one blade (204, 205) and

5. Device (100, 200, 300) according to one of claims 1 to 4, which further comprises three drive means (110, 111, 112) in rotation of the cutting tape (102) having axes of parallel and non-coplanar rotations (116, 117, 118), the cutting tape forming a triangle around the means for driving in rotation, the triangle delimiting an internal space and an external space.

6. Device (100, 200, 300) according to claim 5, which comprises a frame (113) positioned in the external space of the triangle covering two sides of the triangle, the frame comprising a free section positioned facing the third side of the triangle, each blade (104, 105, 204, 205) being:

- configured to guide the branch (101, 201) to the cutting tape (102).

7. Device (100) according to claim 6, in which a portion of each blade (104, 105), positioned in the external space of the triangle, is configured to be positioned in abutment against a contour (114, 115) of the free section in a position of maximum separation of the blades.

8. Device (100) according to one of claims 1 to 7, wherein the return means (106) comprises at least one rigid element (109) connecting the two blades (104, 105), the two blades being deformable and configured for:

- be deformed when inserting the branch (101) between the two blades and

- forming the recall means.

9. Device (100, 200, 300) according to one of claims 1 to 8, wherein the return means comprises a spring (206) configured to bring the two blades (104, 105, 204, 205) closer when insertion of the branch (101, 201) between the two blades.

10. Device (100, 200, 300) according to one of claims 1 to 9, which further comprises a handle (120) for gripping the user.

11 . Device (500) according to one of Claims 1 to 10, which further comprises an extension (122).

12. Device (500) according to claim 11, wherein the extension (122) is telescopic.

13. Pruning method (400) of a branch by a pruning device (100, 200, 300) according to one of claims 1 to 12, characterized in that it comprises:

- a step of inserting (401) the branch between two blades of the device,

- a detection step (402) of the separation of the two blades of the device and, depending on the separation detected,

- an activation step (403) of the motor or

- a deactivation step (406) of the motor.