Cutting device

Abstract

The invention relates to a cutting device, in particular a garden cutting device, having at least two cutting elements (12a, 14a; 12b, 14b; 12c, 14c; 12d, 14d) which can be moved relative to one another, two gripping elements (16a, 18a; 16b, 18b; 16c, 18c; 16d, 18d) which can be moved relative to one another, and at least one drive unit (20a; 20b; 20c; 20d) which, in at least one operating state, is provided for at least assisting the movement of the second cutting element (14a; 14b; 14c; 14d) relative to the first cutting element (12a; 12b; 12c; 12d). The invention proposes that the cutting device has at least one self-switching clutch unit (22a; 22b; 22c; 22d) which, in at least one operating state in which the drive unit (20a; 20b; 20c; 20d) is deactivated, is provided for decoupling the drive unit (20a; 20b; 20c; 20d).

Description

[0001] This application is a divisional application of application number 201610239792.7, publication number CN106034764A, application date April 18, 2016, entitled "Cutting Device". Technical Field

[0002] This invention relates to a cutting device, particularly a garden cutting device. Background Technology

[0003] Cutting devices, especially garden cutting devices, have been proposed.

[0004] A cutting device is known from DE 10 2010 016 296 B4, which has two cutting blades that can move relative to each other, two gripping elements that can move relative to each other, and a drive unit that is configured in operation to assist the movement of the second cutting blade relative to the first cutting blade. Summary of the Invention

[0005] The present invention relates to a cutting device, particularly a garden cutting device, having at least two cutting elements movable relative to each other, two gripping elements movable relative to each other, and at least one drive unit, said drive unit being configured in at least one operating state to at least assist the movement of the second cutting element relative to the first cutting element.

[0006] The present invention proposes a cutting device having at least one self-converting clutch unit, which is configured to disengage the drive unit in at least one operating state where the drive unit is deactivated. The cutting device is preferably configured as a trimmer, and particularly preferably as a garden trimmer. Preferably, two cutting blades capable of moving relative to each other are supported in a swing-like manner relative to each other.

[0007] In this context, "garden cutting device" should be understood in particular as a cutting device designed for application to plants. A garden pruning machine should preferably be understood in particular as a cutting device designed for cutting growing materials, hedges, shrubs, branches, and / or other objects deemed meaningful by a professional. In this context, "cutting element" should preferably be understood in particular as an element of the cutting device designed for direct contact with the object to be cut. The cutting element should preferably be understood in particular as an element designed for directly separating the object to be cut. In this principle, it can be considered that at least one of the cutting elements is configured passively, for example, as an anvil and / or as a passive cutting edge. However, it is preferred that at least one cutting element has an active cutting edge, particularly a blade, designed for active cutting. Furthermore, "gripping element" should preferably be understood in this context as an element that forms at least part of a handle. This should preferably be understood in particular as an element that is at least partially gripped by the operator during operation. In particular, during operation, both gripping elements are gripped by the operator, especially with one hand. The phrase "assisting the movement of the second cutting element relative to the first cutting element" should be understood in the context, in particular, as the generation of a force by the drive element that acts at least partially in the same direction as the operating force. Preferably, this should be understood as the hand-operated force, in particular causing the closing movement of the cutting elements relative to each other, being additionally assisted by a force generated by the drive unit in at least one operating state.

[0008] In this context, "self-converting clutch unit" should be understood in particular as a clutch unit that is not operated by external, particularly electrical, switching signals, especially switching signals from the control unit. Preferably, it should be understood in particular as a clutch unit that is not operated by explicit control signals, particularly for switching between engaged and disengaged states. Preferably, it should be understood in particular as a clutch unit operated based on machine influence factors. Preferably, it should be understood in particular as a clutch unit operated according to at least one parameter from the driving side and / or the driven side. Different self-converting clutch units that are considered meaningful by those skilled in the art can be considered, such as centrifugal clutches, freewheel mechanism clutches, and / or safety clutches. Therefore, the clutch unit can be particularly configured to be speed-controlled, torque-controlled, direction-controlled, and / or force-flow-controlled. Furthermore, in this context, "drive unit decoupling" should be understood in particular as decoupling the drive unit from the closing mechanism of the cutting device.

[0009] The cutting device configuration according to the invention allows for advantageous decoupling of the drive unit. This, in particular, enables advantageous and convenient manual operation of the cutting device. Furthermore, a clutch unit can be advantageously provided that is operated without electrical switching signals. This, in particular, eliminates the need for a control unit for operating the clutch unit. Preferably, a particularly reliable clutch unit can be provided. In particular, a clutch unit that can be operated independently of the power supply can be provided.

[0010] Furthermore, it is proposed that at least one self-converting clutch unit is configured to decouple the drive unit in at least one operating state to achieve fully manual operation. In this context, "fully manual operation" should be understood in particular as an operating state in which the cutting device operates without the assistance of the drive unit. The fully manual operation should preferably be understood as an operating state in which the cutting device operates solely by the operator's active force. The fully manual operation is particularly preferably understood as an operating state in which the drive element is decoupled and therefore cannot be used to assist the movement of the second cutting element relative to the first cutting element. This allows for advantageously easy manual operation of the cutting device. It also allows for advantageous use of the cutting device without a drive unit, for example, in the absence of power supply and / or in simple cutting operations.

[0011] Furthermore, it is proposed that the at least one self-converting clutch unit is constructed as a freewheel mechanism clutch. In this context, "freewheel mechanism clutch" should be understood in particular as a self-converting clutch constructed to be directionally and / or force-flow directionally controlled. The freewheel mechanism clutch is preferably at least directionally controlled. The freewheel mechanism clutch is preferably configured to open and / or close according to the direction of rotation, particularly the direction of rotation of the driving and / or driven side of the clutch unit and / or according to the direction of the force acting on the freewheel mechanism clutch. The direction of the force can be distinguished, for example, whether the force acts on the freewheel mechanism clutch from the driving side or the driven side. The freewheel mechanism clutch is preferably configured to open or close the drive unit in at least one operating state according to the direction of rotation, particularly the direction of rotation of the driving and / or driven side and / or according to the direction of the force acting on the freewheel mechanism clutch. This provides a particularly advantageous self-converting clutch unit. This particularly enables advantageously easy manual operation of the cutting device. This preferably provides a particularly reliable clutch unit.

[0012] Furthermore, it is proposed that the at least one self-converting clutch unit has at least one clamping body. The self-converting clutch unit preferably has multiple, particularly at least three, clamping bodies. The self-converting clutch unit preferably has multiple clamping bodies arranged sequentially in the circumferential direction. In this context, "clamping body" should be understood in particular as an element of the clutch unit that is configured in at least one operating state, particularly in the clutch-closed state, for clamping between two rotating elements of the clutch unit that are rotatably supported relative to each other. The clamping body is preferably form-locked to one rotating element in the rotational direction and force-locked, particularly friction-locked, to the other rotating element in the rotational direction. This should preferably be understood in particular as an element configured to couple the rotating elements of the clutch unit to each other without relative rotation or to decouple the rotating elements of the clutch unit relative to each other in terms of circumferential movement, depending on the operating state of the clutch unit. The clamping body is preferably clamped between the rotating elements in the clutch-closed state. Preferably, at least one of the rotating elements of the clutch unit has a ramp by which the radial spacing between these rotating elements can be changed. If the clamping body moves into an area with a small radial spacing, the rotation of the non-sloping rotating element is achieved by friction. If the clamping body moves into an area with a large radial spacing, the rotation of the non-sloping rotating element is not achieved because the friction is insufficient. Different clamping bodies, which are considered meaningful by those skilled in the art, can be considered; however, the clamping body is preferably constructed as at least partially cylindrical or at least partially globe-shaped. This can, in particular, provide a particularly advantageous self-changing clutch unit. This can, in particular, provide an advantageous, especially simple, freewheel mechanism clutch. This can, preferably, provide a particularly reliable self-changing clutch unit.

[0013] Furthermore, it is proposed that the at least one self-converting clutch unit has at least one cage receiving clamping bodies and a braking element, which is configured in at least one operating state to brake the cage. The clutch unit preferably has multiple clamping bodies received in the same cage. The cage preferably receives the clamping bodies in mutually separated receiving areas. The braking element is preferably configured in at least one operating state to increase the inertia of the cage. The braking element is preferably configured to prevent undesirable torsion of the cage. The braking element is particularly preferably configured to prevent cage torsion until a defined force is applied. The braking element is preferably spring-loaded. In particular, the braking element is pressed against the cage with a defined force. In this context, "cage" should be understood in particular as an element of the clutch unit configured to position and / or guide the at least one clamping body, particularly in the circumferential direction. The cage is preferably configured to space the multiple clamping bodies apart from each other in the circumferential direction and, particularly, to distribute them evenly around the circumference. Particularly preferably, the cage is configured to guide the multiple clamping bodies relative to each other in the circumferential direction. This allows for advantageously defined clamping movements. Particularly in the case of multiple clamping bodies, these bodies perform the same movement in the circumferential direction. Controlled clamping of the clamping bodies is preferably achieved. Furthermore, the braking element prevents accidental movement of at least one clamping body. Accidental clamping is particularly prevented. Moreover, this allows the clamping body to twist only under the force of the rotating element that engages the shape of the clutch unit. The braking element, in particular, enables reliable disengagement of the clutch unit. Preferably, the braking element allows the clamping body to remain stationary during the disengagement movement of the clutch unit, thereby enabling the clutch unit to disengage.

[0014] Furthermore, it is proposed that the at least one self-converting clutch unit has at least one locking pawl element. The locking pawl element is preferably configured to be actuated by one of the gripping elements. Furthermore, the at least one self-converting clutch unit preferably has a locking wheel, in which the locking pawl element is engaged in at least one state. In this context, "locking pawl element" should be understood in particular as an element configured in at least one operating state for engagement with an element rotatably supported relative to the locking pawl element. The locking pawl element is preferably configured to prevent rotation of the element relative to one direction of the locking pawl element and preferably releases the opposite direction. The locking pawl element should particularly preferably be understood as an element configured in at least one operating state for engagement with the locking wheel and for preventing rotation of the locking wheel relative to one direction of the locking pawl element while preferably releasing the opposite direction of rotation of the locking wheel. The locking pawl element is preferably configured in at least one operating state for engagement with the teeth of the locking wheel. The locking wheel preferably has asymmetrical tooth flanks. Here, in particular, one tooth flank is steep, causing the locking pawl element to be clamped against the tooth flank, while the other tooth flank is gentle, allowing the locking pawl element to slide over and be lifted from the tooth flank. This provides a particularly advantageous self-engaging clutch unit. It also provides a particularly reliable self-engaging clutch unit.

[0015] Furthermore, it is proposed that the cutting device has at least one winch (Seilwinde) that can be driven by a drive unit and at least one rope at least partially wound on the winch, the rope being at least partially tensioned between gripping elements. The rope is preferably tensioned between the ends of the gripping elements opposite to the cutting element. The rope is preferably securely fixed to one gripping element and secured by the winch. The free length of the rope can be varied, in particular, by means of the winch. Preferably, the winch is configured to be driven by the drive unit via a clutch unit. The winch is preferably configured to be disengaged from the drive unit via the clutch unit in at least one operating state. Particularly preferably, the winch forms the driven side of the clutch unit. In this context, "winch" should be understood in particular as a rope drum, especially a cylindrical rope drum, configured to be driven by the drive unit in at least one operating state. This allows for advantageous force application by the drive unit. This, in particular, allows for structurally simple implementation of assisting the movement of the second cutting element relative to the first cutting element. The operator can thus be advantageously assisted by the drive unit during the closing movement. Furthermore, the force applied to the gripping element by the drive unit can provide advantageously high torque. This, in turn, allows the power consumption of the drive unit to remain low.

[0016] Furthermore, it is proposed that the at least one rope is tensioned in the region between the gripping area of ​​the gripping element and the rotational joint between the gripping elements, the gripping elements being configured to swing relative to each other via the rotational joint. Preferably, the rope is tensioned between the gripping elements close to the rotational joint, particularly closer than 10 cm, preferably closer than 8 cm, and especially preferably closer than 5 cm. In this context, "gripping area" should be understood in particular as an area of ​​the gripping element in which the operator generally grips it. This advantageously prevents the operator from being distracted by the rope. Furthermore, the rope can be advantageously constructed to be short. Consequently, the winch can be particularly advantageously constructed to be small. Moreover, the cutting device can be quickly closed using the low rotational speed of the winch.

[0017] Furthermore, it is proposed that the at least one self-converting clutch unit is at least partially integrated into the at least one winch. Preferably, the clutch unit is at least partially surrounded by the winch. The winch preferably constitutes a functional component of the clutch unit. In the context, "clutch unit integrated into winch" should be understood in particular as the clutch unit being at least partially spatially arranged in the winch, or at least partially surrounded by the winch. Preferably, the clutch unit is functionally integrated into the winch. The winch preferably directly forms the rotating element of the clutch unit, particularly the external rotating element. In the context, "at least partially surrounded" should be understood in particular as the clutch unit being surrounded by the winch in at least one plane within an angular range of at least 90°, preferably at least 180°, and particularly preferably at least 360°. This advantageously keeps the number of components small. Furthermore, this allows for an advantageously compact structural configuration. In particular, the intermediate shaft can be eliminated.

[0018] Furthermore, it is proposed that the cutting device has at least one spring element connected to a winch, said spring element being particularly constructed as a helical coil spring, and said spring element being configured to tension the rope in at least one operating state. The spring element is preferably configured to ensure rope tension. The spring element is preferably configured to apply a force to the winch, particularly in the circumferential direction. The spring element is particularly preferably configured to apply tension to the rope via the winch. In particular, the rope should be kept taut by the spring element. The spring element preferably has a spring force smaller than the spring force required to open a spring. In this context, "spring element" should be understood in particular as a macroscopic element having at least such an extension dimension and / or number of turns that, in normal operating conditions, can elastically vary by at least 10%, particularly at least 20%, preferably at least 30%, and particularly advantageously at least 50%, and that the element particularly generates a reaction force related to, and preferably proportional to, the change in said extension dimension and / or number of turns, which resists said change. In this context, "extension dimension" should be understood in particular as the maximum distance between two points on the vertical projection of the element onto a plane. "Macro element" should be understood in particular as an element having an extension dimension of at least 1 mm, especially at least 5 mm, and preferably at least 10 mm. The tension of the rope can also be ensured, especially during fully manual operation, by means of a spring element. This advantageously prevents accidental knotting of the rope. Furthermore, rope winding can be ensured without a drive mechanism.

[0019] Furthermore, it is proposed that the at least one self-converting clutch unit is arranged in the first gripping element of the gripping element at the end opposite to the cutting element. The at least one self-converting clutch unit is preferably arranged within the housing of the first gripping element. This allows for an advantageously compact construction. Furthermore, this allows for a particularly advantageous weight distribution. In particular, the weight of the clutch unit can be directly distributed in the area of ​​the operator's hands. This, in turn, achieves high operating comfort.

[0020] Furthermore, it is proposed that the cutting device has at least one transmission unit arranged in the first gripping element of the gripping element. The transmission unit is preferably arranged within the housing of the gripping element. In this context, "transmission unit" should be understood in particular as a variable-speed transmission unit having a transmission ratio greater than 2, preferably greater than 10, and especially preferably greater than 50. This allows for an advantageously compact construction. Furthermore, this allows for a particularly advantageous weight distribution. In particular, the weight of the transmission unit can be directly distributed in the area of ​​the operator's hands. This, in turn, allows for high operating comfort. In particular, it also allows for the achievement of requirements at least comparable to those of conventional manually operated garden trimmers.

[0021] Furthermore, it is proposed that the drive unit and transmission unit are spatially arranged between the cutting element and the at least one self-converting clutch unit. The cutting element and the at least one self-converting clutch unit are preferably arranged on opposite sides of an imaginary geometric cuboid that just completely surrounds the drive unit and transmission unit. The drive unit, transmission unit, and clutch unit are preferably arranged within the first gripping element. This allows for an advantageously compact construction. Furthermore, this allows for a particularly advantageous weight distribution.

[0022] Furthermore, it is proposed that the at least one transmission unit has at least two transmission stages, and the at least one self-converting clutch unit is arranged between the at least two transmission stages. The transmission unit preferably has two transmissions, particularly two planetary gear transmissions, with the clutch unit arranged between the two transmissions. Viewed along the power flow, the clutch unit is preferably arranged between the transmissions of the transmission unit. The clutch unit is particularly preferably integrated into the drive unit. This allows for an advantageously compact construction. Furthermore, this advantageously keeps the torque acting on the at least one self-converting clutch unit small.

[0023] Furthermore, it is proposed that the cutting device has at least one force sensor integrated into the second gripping element of the gripping element. The cutting device preferably has at least one control unit connected to the force sensor and configured to control the drive unit. The control unit is preferably configured to control the drive unit based on the signal from the force sensor. The control unit is particularly preferably configured to activate the drive unit when a predetermined measurement value of the force sensor is exceeded. The force sensor is preferably coupled to the gripping area of ​​the second gripping element. The gripping area is particularly preferably movably supported relative to the base of the second gripping element. The force sensor is preferably configured to detect forces acting on the second gripping element, particularly relative to the first gripping element. The force sensor is preferably configured not only to sense precise forces but also to sense only the excess of the reaction force. This advantageously allows sensing of the force applied to the cutting device by the operator. For example, it is preferable to sense how much force the operator must apply to the cutting device.

[0024] Furthermore, it is proposed that the cutting device has at least one stroke sensor. The stroke sensor is preferably configured as a Hall sensor. The stroke sensor is preferably configured to detect the angular position of the gripping elements relative to each other. The cutting device preferably has at least one control unit connected to the stroke sensor and configured to control the drive unit. Particularly preferably, the control unit is configured to deactivate the drive unit when the gripping elements reach their relative end positions using measurements from the stroke sensor. This advantageously allows for accurate detection of the angular position of the gripping elements relative to each other. This reliably enables the drive unit to stop at the end position of the cutting device.

[0025] Furthermore, a method for operating a cutting device is proposed. The invention proposes that when a predetermined operating force is exceeded, the drive unit is engaged with the closing mechanism of the cutting device. This provides an advantageously comfortable cutting device. Moreover, it is particularly possible to engage the drive unit only when cutting is difficult. This keeps energy consumption low.

[0026] Furthermore, it is proposed that the drive unit stops automatically upon reaching the end position of the cutting device and is briefly driven in the opposite direction to disengage the clutch unit. Here, "drive direction" should be understood specifically as the rotational direction of the drive unit, which it rotates in during normal operation, particularly to assist the cutting motion. This allows the cutting device to be opened advantageously and quickly. In particular, it enables intuitive operation. Disengaging the clutch unit can be reliably achieved.

[0027] Alternatively, the drive unit is deactivated automatically upon reaching the end position of the cutting device, and the clutch unit disengages automatically when the rotational movement of the drive unit stops. This advantageously enables rapid opening of the cutting device. In particular, it allows for intuitive operation.

[0028] Here, the cutting apparatus and method according to the present invention should not be limited to the foregoing applications and embodiments. In order to fulfill the functional modes described herein, the cutting apparatus and method according to the present invention may, in particular, have a different number of various elements, components, and units than those listed herein. Attached Figure Description

[0029] Other advantages are apparent from the following description of the accompanying drawings. Four embodiments of the invention are illustrated in the drawings. The drawings, description, and claims contain a large number of combinations of features. Those skilled in the art can also study these features individually and generalize other meaningful combinations.

[0030] The attached diagram shows:

[0031] Figure 1 A schematic partial cross-sectional view of the cutting device of the present invention, which has two cutting elements, two gripping elements, and a driving unit.

[0032] Figure 2 A schematic diagram of the cutting device of the present invention and the forces acting during operation.

[0033] Figure 3 A schematic cross-sectional view of part III of the cutting device of the present invention, including the clutch and transmission unit.

[0034] Figure 4 A schematic diagram of the clutch unit, winch, and spring element of the cutting device of the present invention.

[0035] Figure 5 A schematic diagram of the clutch unit of the cutting device in the engaged state.

[0036] Figure 6 A schematic diagram of the clutch unit of the cutting device in the disengaged state.

[0037] Figure 7 A flowchart of a method for operating the cutting apparatus according to the present invention.

[0038] Figure 8 A schematic partial cross-sectional view of an alternative cutting device of the present invention, showing two cutting elements, two gripping elements, and a drive unit.

[0039] Figure 9 A schematic cross-sectional view of a portion of the alternative cutting device of the present invention in section IX-IX.

[0040] Figure 10 A schematic cross-sectional view of a portion of the cutting device of the present invention in section XX.

[0041] Figure 11 A schematic cross-sectional view of a portion of the alternative cutting device of the present invention in section XI-XI.

[0042] Figure 12 A schematic cross-sectional view of a portion of the alternative cutting device of the present invention in section XII-XII.

[0043] Figure 13 A schematic partial cross-sectional view of another alternative cutting device of the present invention, showing two cutting elements, two gripping elements, and a drive unit.

[0044] Figure 14 A schematic diagram of another alternative drive unit and transmission unit of the cutting apparatus of the present invention.

[0045] Figure 15 A partial schematic diagram of the alternative cutting device of the present invention, including a clutch unit.

[0046] Figure 16 A schematic diagram of a portion XVI of the alternative cutting device of the present invention, including a clutch unit.

[0047] Figure 17 A schematic partial cross-sectional view of another alternative cutting device of the present invention, showing two cutting elements, two gripping elements, and a drive unit.

[0048] Figure 18 Schematic exploded view of another alternative cutting device of the present invention. Detailed Implementation

[0049] Figure 1 A cutting device 10a according to the present invention is shown. The cutting device 10a is configured as a garden cutting device. The cutting device 10a is configured as a garden trimmer. However, other configurations of the cutting device 10a that are considered meaningful by a person skilled in the art are also possible in principle. The cutting device 10a has two cutting elements 12a and 14a that are movable relative to each other. The cutting elements 12a and 14a are capable of oscillating relative to each other. Here, the first cutting element 12a is configured as a passive cutting blade with a cutting edge. The second cutting element 14a is configured as an active cutting blade with a cutting edge. Furthermore, the cutting device 10a has two gripping elements 16a and 18a that are movable relative to each other. The gripping elements 16a and 18a are capable of oscillating relative to each other. The gripping elements 16a and 18a are configured to oscillate relative to each other via a rotary joint 42a. The cutting elements 12a and 14a are also configured to oscillate relative to each other via a rotary joint 42a. The rotary joint 42a is arranged between the gripping elements 16a and 18a and the cutting elements 12a and 14a. The first gripping element 16a and the first cutting element 12a are fixedly connected to each other and arranged on different sides of the rotary joint 42a. Furthermore, the second gripping element 16a and the second cutting element 14a are fixedly connected to each other and arranged on different sides of the rotary joint 42a. The gripping elements 16a and 18a are configured for gripping by the operator. The gripping elements 16a and 18a are configured for gripping by the operator with the same hand. However, in principle, it is also possible for the cutting device 10a to be operated with both hands. In addition, an opening spring 50a is arranged in the rotary joint 42a. The opening spring 50a is arranged between the gripping elements 16a and 18a. The opening spring 50a is constructed as a helical spring. The opening spring 50a is configured to press the gripping elements 16a and 18a apart when they are not loaded, thereby opening the cutting device 10a.

[0050] Furthermore, the cutting device 10a has a drive unit 20a. The drive unit 20a is configured as an electric motor. The drive unit 20a is configured as a 3.6V electric motor. The drive unit 20a is arranged in the first gripping element 16a. The drive unit 20a is arranged in the handle housing 44a of the first gripping element 16a. The handle housing 44a has two housing halves, in which the drive unit 20a is fixedly received. In operation, the drive unit 20a is configured to assist the movement of the second cutting element 14a relative to the first cutting element 12a. The drive unit 20a is configured to assist the closing movement of the cutting device 10a implemented by the gripping elements 16a and 18a in situations where cutting is difficult. This reduces the force required by the operator. Figure 2 ).

[0051] Furthermore, the cutting device 10a has a transmission unit 38a. The transmission unit 38a is constructed as a gear transmission. The transmission unit 38a has a transmission ratio of 130:1. However, other transmission ratios deemed meaningful by a skilled practitioner may also be considered in principle. The transmission unit 38a is arranged in the first gripping element 16a. The transmission unit 38a is arranged in the handle housing 44a of the first gripping element 16a. The transmission unit 38a has a plurality of rigid shafts fixedly arranged in the handle housing 44a. Gears are supported on these shafts of the transmission unit 38a by a sliding fit. For the sake of simplicity, the teeth of each gear are not shown. The transmission unit 38a can be directly driven by the drive unit 20a. The force transmission from the drive unit 20a to the transmission unit 38a is carried out through a pinion gear. Figure 3 ).

[0052] Furthermore, the cutting device 10a has a self-converting clutch unit 22a. The self-converting clutch unit 22a is configured as a freewheel mechanism clutch. The clutch unit 22a is arranged in the first gripping element 16a. The clutch unit 22a is arranged in the handle housing 44a of the first gripping element 16a. Furthermore, the clutch unit 22a is arranged on the end of the first gripping element 16a opposite to the cutting elements 12a and 14a. The self-converting clutch unit 22a is configured to disengage the drive unit 20a in at least one operating state where the drive unit 20a is deactivated. The self-converting clutch unit 22a is configured to disengage the drive unit 20a to achieve fully manual operation. The clutch unit 22a has an inner rotating element 46a and an outer rotating element 48a. Furthermore, the clutch unit 22a has a plurality of clamping bodies 24a. The clamping bodies 24a are arranged between the inner rotating element 46a and the outer rotating element 48a. The clamping bodies 24a are arranged sequentially around the inner rotating element 46a in the circumferential direction. The clamping body 24a is constructed as a sphere. However, other configurations of the clamping body 24a that are considered meaningful by those skilled in the art are also possible in principle. The internal rotating element 46a has a plurality of ramps 49a that follow each other in the circumferential direction. Here, the number of ramps 49a corresponds to the number of clamping bodies 24a. The clamping bodies 24a are arranged to move between the ramps 49a, wherein the clamping bodies 24a are driven when the internal rotating element 46a rotates. If the internal rotating element 46a is driven in the circumferential direction against the upward direction of the ramps, the ramps 49a cause the clamping bodies 24a to roll upward and the clamping bodies are pressed against the external rotating element 48a. The external rotating element 48a is rotated. Figure 5 As shown, clutch unit 22a is closed in this state. However, if the external rotating element 48a is driven, the clamping body 24a remains in the valley of the ramp 49a and is spaced apart from the external rotating element 48a, regardless of the direction of rotation. Rotational actuation does not occur. Figure 6 As shown, clutch unit 22a is open in this state. The internal rotating element 46a of clutch unit 22a is configured to be driven by drive unit 20a. A gear of transmission unit 38a is pressed against the internal rotating element 46a of clutch unit 22a. The internal rotating element 46a is driven by drive unit 20a via transmission unit 38a. Transmission unit 38a and drive unit 20a form the drive side of clutch unit 22a. Drive unit 20a and transmission unit 38a are spatially arranged between cutting elements 12a, 14a and the self-converting clutch unit 22a.

[0053] The self-converting clutch unit 22a has a retainer 26a for receiving clamping bodies 24a. The retainer 26a receives the clamping bodies 24a in separate receiving areas. The retainer 26a is used to position and guide the clamping bodies 24a circumferentially. The retainer 26a is configured to space the clamping bodies 24a apart circumferentially and distribute them evenly. The retainer 26a is partially annular in construction. The retainer 26a is supported on an internal rotating element 46a of the clutch unit 22a. Furthermore, the clutch unit 22a has a braking element 28a configured to brake the retainer 26a. The braking element 28a is configured to increase the inertia of the retainer 26a. The braking element 28a is configured to prevent undesirable torsion of the retainer 26a. The braking element 28a is configured to suppress torsion of the retainer 26a until a defined force is applied. The braking element 28a is constructed as a spring element. During operation, the braking element 28a is engaged in a groove on the outer side of the retainer 26a. For this purpose, the retainer 26a has a plurality of circumferentially aligned grooves on its outer side. The braking element 28a is fixed in the handle housing 44a of the gripping element 16a and presses against the retainer 26a with a defined force. The braking element 28a is fixed in the handle housing 44a of the gripping element 16a at both ends, wherein the free middle portion of the braking element 28a presses against the retainer 26a. Figure 3 ,4).

[0054] Furthermore, the cutting device 10a has a winch 32a that can be driven by the drive unit 20a. The winch 32a is constructed as a partially hollow cylindrical rope drum. The winch 32a is arranged in the first gripping element 16a. The winch 32a is arranged in the handle housing 44a of the first gripping element 16a. The winch 32a is arranged on the side of the clutch unit 22a opposite to the cutting elements 12a and 14a. The self-converting clutch unit 22a is partially integrated into the winch 32a. The clutch unit 22a is partially surrounded by the winch 32a. The winch 32a is integrally constructed with the external rotating element 48a of the clutch unit 22a. The winch 32a constitutes the external rotating element 48a of the clutch unit 22a. Furthermore, the winch 32a constitutes the driven side of the clutch unit 22a. In addition, the cutting device 10a has a rope 34a wound on the winch 32a. Rope 34a is tensioned between two gripping elements 16a and 18a. Rope 34a is fixedly connected to the end of the second gripping element 18a away from the cutting elements 12a and 14a. Rope 34a is variably wound around a winch 32a on the first gripping element 16a, with one end of rope 34a also fixedly connected to the winch 32a. The free length of rope 34a can be changed via the winch 32a.

[0055] Furthermore, the cutting device 10a has a spring element 36a connected to the winch 32a. The spring element 36a is constructed as a coiled spring. The spring element 36a is arranged in the first gripping element 16a. The spring element 36a is arranged in the handle housing 44a of the gripping element 16a. The spring element 36a is arranged on the side of the winch 32a opposite to the cutting elements 12a and 14a. One end of the spring element 36a is configured to be fixed to the handle housing 44a of the gripping element 16a, and the other end is configured to be fixed to the winch 32a. The spring element 36a is configured to tension the rope 34a. The spring element 36a is configured to ensure the tension of the rope 34a. For this purpose, the spring element 36a is configured to load the winch 32a with a circumferential force. The spring element 36a is configured to apply tension to the rope 34a through the winch 32a. In particular, the tension of the rope 34a should be maintained by the spring element 36a. Spring element 36a has a spring force F greater than that of spring 50a. OS Small spring force F VS ( Figure 2 ,4).

[0056] Furthermore, the cutting device 10a has a control unit 52a. The control unit 52a is arranged in the first gripping element 16a. The control unit 52a is arranged in the handle housing 44a of the gripping element 16a. The control unit 52a is configured to operate the drive unit 20a. In principle, not only can the drive unit 20a be simply controlled, but closed-loop regulation of the drive unit 20a can also be performed. For this purpose, the control unit 52a supplies power to the drive unit 20a. The control unit 52a is arranged between the drive unit 20a and the rotating joint 42a. The control unit 52a is connected to the energy storage unit 54a. The drive unit 20a can be powered by the control unit 52a through the energy storage unit 54a. The energy storage unit 54a has two battery units 56a and 58a. The battery units 56a and 58a are each composed of lithium-ion batteries. However, other configurations of the battery units 56a and 58a that are considered meaningful by a person skilled in the art are also possible in principle. The first battery unit 56a is arranged in the first gripping element 16a. The first battery unit 56a is disposed in the handle housing 44a of the gripping element 16a. The first battery unit 56a is disposed directly next to the control unit 52a. The second battery unit 58a is disposed in the second gripping element 18a. The second battery unit 58a is disposed in the handle housing 60a of the second gripping element 18a. Battery units 56a and 58a are respectively connected to the control unit 52a. Figure 1 ,2).

[0057] The cutting device 10a also includes a force sensor 40a. The force sensor 40a is integrated into the second gripping element 18a of the gripping elements 16a and 18a. The force sensor 40a is disposed within the handle housing 60a of the second gripping element 18a. Furthermore, the force sensor 40a is coupled to the gripping area 62a of the second gripping element 18a. The gripping area 62a forms a placement surface on the second gripping element 18a for the operator's hand, particularly the fingers. The gripping area 62a is capable of swinging about an axis 66a in a restricted manner relative to the handle housing 60a. The gripping area 62a is supported on the handle housing 60a at its free end by means of a spring 68a. The spring 68a forms part of the force sensor 40a. When the cutting device 10a is closed, the gripping area 62a swings against the spring force of the spring 68a towards the handle housing 60a at its free end. The force sensor 40a is disposed between the handle housing 60a and the gripping area 62a. Force sensor 40a senses the force acting between handle housing 60a and gripping area 62a. Therefore, the force sensor 40a can advantageously detect the force acting on the second gripping element 18a relative to the first gripping element 16a. Force sensor 40a has a spring 68a and a switch 72a. Switch 72a includes two contact elements, wherein a first contact element is arranged on the free end of gripping area 62a, and a second contact element is arranged opposite the first contact element on handle housing 60a. Switch 72a closes when the free end of gripping area 62a approaches handle housing 60a to a defined extent. However, in principle, switch 72a can also be constructed as a pressure switch, which is triggered upon contact. This eliminates the second contact element. Combined with the defined spring force of spring 68a, a force can be defined such that switch 72a of force sensor 40a closes when this force is present. This provides a force sensor 40a that is particularly inexpensive and structurally simple. In principle, alternative configurations of the force sensor 40a that are deemed meaningful by a professional can also be considered. For example, the force sensor 40a could have a piezoelectric crystal arranged between the gripping area 62a and the handle housing 60a. This would allow for precise sensing of the currently applied force. The trigger force of the force sensor 40a could then be freely defined via software. Figure 2 ).

[0058] Force sensor 40a is connected to control unit 52a. Control unit 52a is configured to control drive unit 20a based on the signal from force sensor 40a. Control unit 52a is configured to activate drive unit 20a when a predetermined measurement value of force sensor 40a is exceeded. Control unit 52a is configured to activate drive unit 20a when switch 72a of force sensor 40a is closed. Furthermore, control unit 52a is also configured to stop drive unit 20a when switch 72a of force sensor 40a is open.

[0059] Furthermore, the cutting device 10a has a stroke sensor 70a. The stroke sensor 70a is constructed as a Hall sensor. However, other configurations of the stroke sensor 70a that are considered meaningful by those skilled in the art are also possible in principle. The stroke sensor 70a is arranged in the rotation joint 42a of the cutting device 10a. The stroke sensor 70a is configured to detect the angular position of the gripping elements 16a, 18a relative to each other. For this purpose, the stroke sensor 70a has two magnets connected to the second gripping element 18a, which are connected to the second gripping element 18a in the rotation joint 42a. In addition, the stroke sensor 70a has a sensor element. This sensor element is connected to the first gripping element 16a in the rotation joint 42a. If the sensor element is directly above the first magnet, the cutting device 10a is fully open. If the sensor element is above the second magnet, the cutting device 10a is fully closed. The cutting device 10a is in the terminal position in this position. Figure 2 ).

[0060] The stroke sensor 70a is connected to the control unit 52a. The control unit 52a is configured to deactivate the drive unit 20a when the gripping elements 16a and 18a reach their end positions relative to each other, or when the cutting device 10a is in a fully closed state, by means of the measurement value of the stroke sensor 70a.

[0061] The cutting device 10a can be divided into a manual mode and an assisted mode during operation. In the manual mode, the operator applies the full cutting force F. cut In the assisted mode, a portion of the cutting force F is also applied by the drive unit 20a. cut .

[0062] The following describes the method for operating the cutting device 10a.

[0063] The cutting device 10a is continuously in an operating mode. However, in principle, it is also possible to consider that the cutting device 10a has an operating switch, by means of which the cutting device 10a can be activated or deactivated. Alternatively, it is also possible to consider that the cutting device 10a is activated automatically, for example, by a defined sequence of closing and / or opening. For example, it is possible to deactivate it based on time.

[0064] If the operator wants to perform a cutting process, for example, on a tree branch during operation, they must position the object to be cut between the cutting elements 12a and 14a of the cutting device 10a. The cutting elements 12a and 14a can then be closed by pressing the gripping elements 16a and 18a together relative to each other, as in the case of a conventional garden pruning machine. The gripping elements 16a and 18a are manually pressed together by the operator in step 118a. Then, in another step 120a, the control unit 52a monitors the signal from the force sensor 40a. The control unit 52a monitors the force required for the cutting process. The control unit 52a checks whether the switch 72a of the force sensor 40a is open or closed.

[0065] If the operator's force F is required for the cutting process user If the force required to close switch 72a is less than that defined by force sensor 40a, the cutting device 10a is used in manual mode. If switch 72a is open, step 120a is repeated in subsequent branch 122a. In manual mode, gripping elements 16a and 18a are manually swung relative to each other by the operator. In manual mode, rope 34a is wound around winch 32a by means of spring element 36a. Because a force is applied to clutch unit 22a from the driven side, clutch unit 22a is in the open state. Therefore, winch 32a can be twisted without the resistance of transmission unit 38a and drive unit 20a. In this state, rope 34a is kept taut by spring element 36a. If the operator reduces the force applied to gripping elements 16a and 18a, for example, because the cutting process has ended, gripping elements 16a and 18a are pressed apart by means of opening spring 50a, and cutting device 10a is opened. Here, the rope 34a is unwound from the winch 32a against the spring force of the spring element 36a.

[0066] If the energy storage unit 54a of the cutting device 10a is empty, the cutting device 10a can be used in manual mode, in which the drive unit 20a remains deactivated when the force exceeds the limit defined by the force sensor 40a. At this time, the drive unit 20a is not activated, and thus the clutch unit 22a also remains open.

[0067] If the operator's force F is required for the cutting process userIf the force required to close switch 72a exceeds the limit set by force sensor 40a, the cutting device 10a is used in assisted mode. The transition from manual mode to assisted mode is generally performed during the cutting process. In manual mode, gripping elements 16a and 18a are manually swung relative to each other by the operator. If cutting a hard object, the operator must apply pressure to gripping elements 16a and 18a relative to each other with a large force. If a force large enough to close switch 72a against spring force Fgs is applied, this is detected by control unit 52a. Control unit 52a then activates drive unit 20a. If it is confirmed in branch 122a that switch 72a is closed, drive unit 20a is activated by control unit 52a in step 124a. Thus, when the defined operating force is exceeded, drive unit 20a engages the closing mechanism of cutting device 10a. Drive unit 20a then drives the internal rotating element 46a of clutch unit 22a via transmission unit 38a. Drive unit 20a is driven in the drive direction 41a. Clutch unit 22a is engaged and drives winch 32a. Rope 34a is wound around winch 32a. Grip elements 16a and 18a are engaged at this time in addition to the operating force F. user In addition to being driven by force F as They are pressed together or pulled together. In this operating state, the drive unit 20a applies an additional force to the cutting elements 12a and 14a when partially moved manually. Here, the driving force F... asThe winch 32a acts on the rope 34a. Next, in another step 126a, the control unit 52a checks the signal from the stroke sensor 70a. The stroke sensor 70a checks the relative positions of the gripping elements 16a and 18a. If, in branch 128a, it is determined that the current position is different from the end position, in another step 130a, it checks whether the switch 72a of the force sensor 40a is open or closed. If the switch 72a is closed, step 126a is repeated via branch 132a. If the switch 72a is open, the drive unit 20a is automatically stopped in step 134a via branch 132a. The drive unit 20a is stopped when the switch 72a of the force sensor 40a is opened. If the force sensor 40a senses a decrease in the operator's force due to the opening of the switch 72a, the control unit 52a stops the drive unit 20a. If it is determined in branch 128a that the current position of the cutting device 10a corresponds to the end position, then in step 134a, the drive unit 20a is automatically stopped. If the stroke sensor 70a senses that the cutting device 10a is in the end position or in a closed state, then the drive unit 20a is stopped by the control unit 52a. After the drive unit 20a stops, in another step 136a, the drive unit 20a is briefly driven in the reverse drive direction 41a to disengage the clutch unit 22a. Here, the drive unit 20a is driven by the control unit 52a only in the reverse drive direction 41a within a small angle range, and then deactivated. After the drive unit 20a is deactivated, the method restarts from the beginning. Figure 7 ).

[0068] However, it is also possible, in principle, that the clutch unit 22a disengages itself when the rotational motion of the drive unit 20a is absent. In particular, it is also possible that when the rotational motion of the drive unit 20a stops, the cutting device 10a is at least partially opened by the opening spring 50a, and the winch 32a is partially twisted against the driving direction 41a of the drive unit 20a by the rope 34a. At this point, the outer rotating element 48a of the clutch unit 22a twists relative to the inner rotating element 46, and the clutch unit 22a is disengaged. However, other methods for disengaging the clutch unit 22a that are deemed meaningful by those skilled in the art are also possible.

[0069] Figures 8 to 17 Three further embodiments of the invention are shown. The following description and drawings are essentially limited to the differences between these embodiments, wherein reference may also be made in principle to the drawings and / or description of other embodiments, particularly those with the same reference numerals, especially those having the same reference numerals. Figures 1 to 7 To distinguish these embodiments, the letter 'a' is placed... Figures 1 to 6 The reference numerals in the accompanying drawings follow the embodiments described above. Figures 8 to 17 In one embodiment, the letter 'a' is replaced by letters 'b' through 'd'.

[0070] Figure 8 An alternative cutting device 10b according to the present invention is shown. The cutting device 10b is configured as a garden cutting device. The cutting device 10b is configured as a garden trimmer. The cutting device 10b has two cutting elements 12b and 14b that are movable relative to each other. Furthermore, the cutting device 10b has two gripping elements 16b and 18b that are movable relative to each other. The gripping elements 16b and 18b are configured to swing relative to each other via a rotating joint 42a. Additionally, an opening spring 50b is arranged near the rotating joint 42b.

[0071] Furthermore, the cutting device 10b has a drive unit 20b. The drive unit 20b is arranged in the first gripping element 16b. The drive unit 20b is arranged in the handle housing 44b of the gripping element 16b. The drive unit 20b is arranged on the end of the first gripping element 16b opposite to the cutting elements 12b and 14b.

[0072] Furthermore, the cutting device 10b has a transmission unit 38b. The transmission unit 38b is arranged in the first gripping element 16b. The transmission unit 38b is arranged in the handle housing 44b of the gripping element 16b. The transmission unit 38b is arranged on the side of the drive unit 20b facing the cutting elements 12b and 14b. The transmission unit 38b can be directly driven by the drive unit 20b. The transmission unit 38b can be directly driven by the pinion of the drive unit 20b. The transmission unit 38b has two planetary gear transmissions 74b and 76b. The first planetary gear transmission 74b follows directly after the drive unit 20b. A self-converting clutch unit 22b is arranged between the first planetary gear transmission 74b and the second planetary gear transmission 76b. Therefore, the transmission unit 38b has at least two transmission stages, and the self-converting clutch unit 22b is arranged between these transmission stages. The transmission unit 38b has four transmission stages, wherein, viewed along the drive flow, three transmission stages are arranged before the clutch unit 22b and one transmission stage is arranged after the clutch unit 22b. The clutch unit 22b is spatially arranged and, viewed along the drive flow, is positioned between the planetary gear transmissions 74b and 76b of the transmission unit 38b. Figure 8 ).

[0073] The cutting device 10b has a self-converting clutch unit 22b. The self-converting clutch unit 22b is constructed as a freewheel mechanism clutch. The clutch unit 22b is arranged within the first gripping element 16b. The clutch unit 22b is arranged within the handle housing 44b of the first gripping element 16b. The clutch unit 22b has an outer rotating element 46b and an inner rotating element 48b. Furthermore, the clutch unit 22b has multiple clamping bodies 24b. The clamping bodies 24b are arranged between the outer rotating element 46b and the inner rotating element 48b. The clamping bodies 24a are arranged circumferentially around the inner rotating element 48b in succession. The clamping bodies 24a are constructed as cylinders. However, other configurations of the clamping bodies 24b that are considered meaningful by those skilled in the art are also possible in principle. The outer rotating element 46b has multiple ramps 49b that follow each other in the circumferential direction on its inner side. Here, the number of ramps 49b corresponds to the number of clamping bodies 24b. The clamping body 24b is arranged to move between the ramps 49b, wherein the clamping body 24b is driven when the outer rotating element 46b rotates. If the outer rotating element 46b is driven in the driving direction 41b in the circumferential direction against the upward direction of the ramp, the clamping body 24b rolls into the gradually narrowing region between the outer rotating element 46b and the inner rotating element 48b and is pressed against the inner rotating element 48b. This achieves rotational drive of the inner rotating element 48b. The clutch unit 22b is closed in this state. If, conversely, the inner rotating element 48b is driven, the clamping body 24b remains in the valley of the ramp 49b and is freely arranged between the rotating elements 46b and 48b, regardless of the direction of rotation. No rotational drive occurs. Figure 10 As shown, clutch unit 22b is open in this state. If the external rotating element 46b is driven against the driving direction 41b, the clamping body 24b moves into the valley of the ramp 49b and is also freely arranged between the rotating elements 46b and 48b. The external rotating element 46b of clutch unit 22b is configured to be driven by drive unit 20b. The external rotating element 46b of clutch unit 22b forms the planetary gear carrier of the first planetary transmission 74b. The external rotating element 46b is driven by drive unit 20b via the first planetary transmission 74b. The first planetary transmission 74b and drive unit 20b form the driving side of clutch unit 22b. The internal rotating element 48b of clutch unit 22b forms the sun gear of second planetary transmission 76b. The second planetary transmission 76b forms the driven side of clutch unit 22b.

[0074] The self-converting clutch unit 22b has a cage 26b that receives clamping bodies 24b. The cage 26b is partially disc-shaped. Multiple axially projecting, arc-shaped tabs are mounted on the disc-shaped base of the cage 26b, extending between the clamping bodies 24b. The cage 26b is supported on an internal rotating element 48b of the clutch unit 22b.

[0075] Furthermore, the clutch unit 22b has a braking element 28b, which is configured to brake the retainer 26b. The braking element 28b is constructed as a spring element. The braking element 28b is constructed as a rotary spring. The braking element 28b is fixedly positioned at one end in a groove on the outer side of the retainer 26b. The braking element 28b extends spirally around the retainer 26b in the circumferential direction. Here, the free end is supported on the housing 75b of the clutch unit 22b, wherein the free end is pressed against the housing 75b by means of spring force and generates a braking effect. Figure 12 ).

[0076] Furthermore, the cutting device 10b has a winch 32b that can be driven by the drive unit 20b. The winch 32b is constructed as a rope drum. The winch 32b is arranged in the first gripping element 16b. The winch 32b is arranged in the handle housing 44b of the first gripping element 16b. The winch 32b is supported on both sides in the handle housing 44a of the gripping element 16a by ball bearings 77a, 77a' respectively. The winch 32b is arranged on the side of the second planetary transmission 76b facing the cutting elements 12b, 14b. The winch 32b constitutes the driven side of the clutch unit 22b, wherein the second planetary transmission 76b results in a transmission ratio between the winch 32b and the clutch unit 22b. The torque acting on the clutch unit 22b can be kept small by the second planetary transmission 76b. The cutting device 10b also has a rope 34b wound on the winch 32b. Rope 34b is also supported in the guide sleeve 78b within the first gripping element 16b. Rope 34b is tensioned between the two gripping elements 16b and 18b. Rope 34b is fixedly connected to the second gripping element 18b in the region between the rotating joint 42b and the ends of the second gripping element 18b opposite to the cutting elements 12b and 14b. Rope 34b is variably wound around the winch 32b on the first gripping element 16b. Rope 34b is tensioned in the region between the gripping areas of the gripping elements 16b and 18b and the rotating joint 42b between the gripping elements 16b and 18b. This advantageously prevents the operator from being disturbed by rope 34b. Figure 8 ,9).

[0077] Furthermore, the cutting device 10b has a spring element 36b connected to the winch 32b. The spring element 36b is constructed as a coil spring. The spring element 36b is arranged in the first gripping element 16b. The spring element 36b is arranged in the handle housing 44b of the first gripping element 16b. The spring element 36b is arranged around the planetary gear carrier of the second planetary transmission 76b. One end of the spring element 36b is fixedly connected to the housing 79b of the second planetary transmission 76b, and the other end is constructed to be fixed to the planetary gear carrier of the second planetary transmission 76b. The housing 79b of the second planetary transmission 76b constitutes the internal gear of the second planetary transmission 76b. The shaft of the winch 32b is connected to the planetary gear carrier of the second planetary transmission 76b without relative rotation. The spring element 36b is provided for tensioning the rope 34b. Figure 9 ,11).

[0078] Furthermore, the cutting device 10b has a control unit 52b. The control unit 52b is connected to the energy storage unit 54b. The energy storage unit 54b has a battery unit 56b. The battery unit 56b is arranged in the first gripping element 16b. The battery unit 56b is arranged in the handle housing 44b of the gripping element 16b. The battery unit 56b is arranged on the side of the transmission unit 38b facing the second gripping element 18b.

[0079] The cutting device 10b also includes a force sensor 40b. The force sensor 40b is integrated into the second gripping element 18b of the gripping elements 16b and 18b. The force sensor 40b is disposed in the first lever 80b of the second gripping element 18b, which is fixedly constructed with a rotary joint 42b. Furthermore, the force sensor 40b is coupled to the gripping area 62b of the second gripping element 18b. The gripping area 62b forms a placement surface 64b on the second gripping element 18b for the operator's hand, particularly the fingers. The gripping area 62b is capable of swinging about an axis 66b with limitation relative to the lever 80b. The gripping area 62b is supported on the lever 80b at its free end by means of a spring 68b. The spring 68b forms part of the force sensor 40b. When the cutting device 10b is closed, the gripping area 62b swings against the spring force of the spring 68b toward the lever 80b. The force sensor 40b is disposed between the lever 80b and the gripping area 62b. Force sensor 40b has a spring 68b and a switch 72b. Switch 72b has a pressure element 81b that protrudes from lever 80b. A pressure surface on gripping area 62b faces the pressure element 81b of switch 72b, and this pressure surface is configured to operate the pressure element 81b. When a defined pressure is applied to the pressure element 81b through the pressure surface, switch 72b closes. Furthermore, it is also possible, in principle, that force sensor 40b can distinguish different degrees of pressure on pressure element 81b, so that the accurate, currently applied force can be deduced. Force sensor 40b is connected to control unit 52b.

[0080] In addition, the cutting device 10b has a stroke sensor that is not visible further. The stroke sensor is connected to the control unit 52b.

[0081] Figure 13 Another alternative cutting device 10c according to the invention is shown. The cutting device 10c is configured as a garden cutting device. The cutting device 10c is configured as a garden trimmer. The cutting device 10c has two cutting elements 12c, 14c that are movable relative to each other. Furthermore, the cutting device 10c has two gripping elements 16c, 18c that are movable relative to each other. The gripping elements 16c, 18c are configured to swing relative to each other via a rotary joint 42c. The cutting elements 12c, 14c are also configured to swing relative to each other via the rotary joint 42c. The rotary joint 42c is arranged between the gripping elements 16c, 18c and the cutting elements 12c, 14c. Furthermore, an opening spring, not further visible, is arranged in the rotary joint 42c.

[0082] The second gripping element 18c is constructed as a two-piece unit. The second gripping element 18c has a base 100c and a gripping area 62c. The gripping area 62c forms a placement surface 64c for the operator's hand, particularly the fingers, on the second gripping element 18c. The gripping area 62c is capable of swinging about an axis 66c with limitation relative to the base 100c. The base 100c is connected to the second cutting element 14c. An open spring, not yet visible, acts on the gripping area 62c of the second gripping element 18c.

[0083] The cutting device 10c also includes a drive unit 20c. The drive unit 20c is arranged in the first gripping element 16c. The drive unit 20c is arranged in the handle housing 44c of the gripping element 16c. The drive unit 20c is arranged on the end of the first gripping element 16c opposite to the cutting elements 12c, 14c.

[0084] Furthermore, the cutting device 10c has a transmission unit 38c. The transmission unit 38c is arranged in the first gripping element 16c. The transmission unit 38c is arranged in the handle housing 44c of the gripping element 16c. The transmission unit 38c is arranged on the side of the drive unit 20c facing the cutting elements 12c and 14c. The transmission unit 38c can be directly driven by the pinion 82c of the drive unit 20c. The pinion 82c of the drive unit 20c meshes with a gear 86c pressed against the main shaft 84c. The main shaft 84c meshes with another gear 88c, which has a rotation axis extending perpendicular to the main shaft 84c. This other gear 88c meshes with a locking wheel 90c of a self-converting clutch unit 22c. The locking wheel 90c can be driven by the drive unit 20c via the transmission unit 38c. The locking wheel 90c is arranged in the rotating joint 42c. The locking wheel 90c can be rotatably supported relative to the gripping elements 16c and 18c. Figure 14 ,15).

[0085] The cutting device 10c has a self-converting clutch unit 22c. The self-converting clutch unit 22c is configured as a freewheel mechanism clutch. The clutch unit 22c is arranged in a rotary joint 42c. The self-converting clutch unit 22c is configured to decouple the drive unit 20c in at least one operating state where the drive unit 20c is deactivated. The self-converting clutch unit 22c is configured to decouple the drive unit 20c for fully manual operation. The self-converting clutch unit 22c has a locking pawl element 30c. The locking pawl element 30c is configured to be actuated by a gripping element 18c. The locking pawl element 30c has two hingedly connected arms 92c and 94c. The first arm 92c is rotatably connected to the second gripping element 18c at an end opposite to the second arm 94c. The second arm 94c is rotatably connected to the base 100c of the second gripping element 18c. The second arm 94c is loaded with a spring force by a spring 96c. Spring 96c presses the second arm 94c against the locking wheel 90c. Furthermore, the second arm 94c is connected to the gripping area 62c of the second gripping element 18c via lever element 98c. The second arm 94c of the locking pawl element 30c can be disengaged from the locking wheel 90c by being pulled against the spring 96c by lever element 98c. This is especially true when the gripping area 62c is only loaded by an opening spring that is not yet visible. Therefore, it can be ensured that the clutch unit 22c opens without any operator pressure on the gripping area 62c. Conversely, if pressure is applied to the gripping area 62c by the operator, the second arm 94c is pressed against the locking wheel 90c by spring 96c. If the locking wheel 90c is driven by the drive unit 20c in the drive direction 41c, the locking wheel 90c tilts toward the locking pawl element 30c and applies torque to the base 100c of the second gripping element 18c via the locking pawl element 30c. This generates a force that assists in the closing of the cutting device 10c. The second gripping element 18c can then be more easily twisted toward the first gripping element 16c by the operator. If the cutting device 10c is closed manually, the locking pawl element 30c can slide against the spring force of the spring 96c on the ramp of the locking wheel 90c. Thus, the cutting device 10c can be closed without the assistance of the drive unit 20c. If the second gripping element 18c is released by the operator, the locking pawl element 30c is pulled out from the locking wheel 90c via the lever element 98c, and the cutting device 10c can open by means of an opening spring that is not further visible. Figure 15 ,16).

[0086] The cutting device 10c also has a control unit that is not further visible. The cutting device 10c also has a force sensor 40c. The force sensor 40c is integrated into the second gripping element 18c of the gripping elements 16c and 18c. The force sensor 40c is disposed in the base 100c of the second gripping element 18c. The force sensor 40c is also coupled to the gripping region 62c of the second gripping element 18c. The force sensor 40c is disposed between the base 100c and the gripping region 62c. The gripping region 62c is supported against the base 100c at its free end by means of a spring. This spring forms part of the force sensor 40c. When the cutting device 10c is closed, the gripping region 62c swings towards the base 100c against the spring force of the spring. The force sensor 40c has a spring and a switch. The switch is closed when the gripping region 62c approaches the base 100c to a defined extent. The force sensor 40c is connected to the control unit 52c. In principle, alternative configurations of the force sensor 40c that are deemed meaningful by a professional could also be considered. For example, the force sensor 40c could have a piezoelectric crystal arranged between the gripping region 62c and the substrate 100c. Figure 13 ,15).

[0087] In addition, the cutting device 10c has a stroke sensor that is not yet visible. The stroke sensor is connected to the control unit 52c.

[0088] Figure 17 Another alternative cutting device 10d according to the invention is shown. The cutting device 10d is configured as a garden cutting device. The cutting device 10d is configured as a garden trimmer. The cutting device 10d has two cutting elements 12d and 14d that are movable relative to each other. Furthermore, the cutting device 10d has two gripping elements 16d and 18d that are movable relative to each other. The gripping elements 16d and 18d are configured to swing relative to each other via a rotary joint 42d. The cutting elements 12d and 14d are also configured to swing relative to each other via a rotary joint 42c. The rotary joint 42d is arranged between the gripping elements 16d and 18d and the cutting elements 12d and 14d. Furthermore, an opening spring, not further visible, is arranged in the rotary joint 42d.

[0089] The second gripping element 18d is a two-piece construction. The second gripping element 18d has a handle housing 60d and a gripping area 62c. The gripping area 62c forms a placement surface 64d on the second gripping element 18d for the operator's hand, particularly the fingers. The gripping area 62d is capable of swinging about an axis 66d with limitation relative to the handle housing 60d. The gripping area 62d is supported at its free end against the handle housing 60d by means of a spring 68d.

[0090] Furthermore, the cutting device 10d has a drive unit 20d. The drive unit 20d is arranged in the first gripping element 16d. The drive unit 20d is arranged in the handle housing 44d of the gripping element 16d. The drive unit 20d is arranged on the end of the first gripping element 16d opposite to the cutting elements 12d and 14d.

[0091] Furthermore, the cutting device 10d has a transmission unit 38d. The transmission unit 38d is arranged in the first gripping element 16d. The transmission unit 38d is arranged in the handle housing 44d of the gripping element 16d. The transmission unit 38d can be directly driven by the pinion 82d of the drive unit 20d. The pinion 82d is arranged on the side of the drive unit 20d opposite to the cutting elements 12d and 14d. The pinion 82d of the drive unit 20d meshes with a gear 104d pressed against the shaft 102d. The shaft 102d passes beside the drive unit 20d towards the rotating joint 42d. The shaft 102d meshes with another gear 106d with teeth machined on the side opposite to the gear 104d. This other gear 106d is connected to the main shaft 108d without relative rotation, and the main shaft meshes with the internal gear 110d of the self-converting clutch unit 22d, which is not further visible. The internal gear 110d can be driven by the drive unit 20d via the transmission unit 38d. The internal gear 110d is arranged in the rotary joint 42d. The internal gear 110d is rotatably supported relative to the gripping elements 16d and 18d. Figure 14 ,15).

[0092] The cutting device 10d has a self-converting clutch unit 22d. The self-converting clutch unit 22d is configured as a freewheel mechanism clutch. The clutch unit 22d is arranged in a rotating joint 42d. The self-converting clutch unit 22d is configured to disengage the drive unit 20d in at least one operating state where the drive unit 20d is deactivated. The self-converting clutch unit 22d is configured to disengage the drive unit 20d for fully manual operation. The self-converting clutch unit 22d has a carrying element 112d. The carrying element 112d is configured to be actuated by a second gripping element 18d. The carrying element 112d is configured to be actuated by a gripping area 62d of the second gripping element 18d. A ball 114d is arranged on the carrying element 112d via a spring 113d. The carrying element 112d is pressurized toward the ball 114d by another spring 115d. The carrying element 112d and the ball 114d are tangentially supported in the second gripping element 18d along the main extension direction 117d. The ball 114d abuts against the groove surface 116d of the gripping area 62d. The groove surface 116d has different planes arranged side by side when viewed along the main extension direction 117d of the second gripping element 18d. The groove surface 116d has two planes with different heights relative to the main extension direction 117d. The groove surface 116d moves relative to the ball 114d according to the position of the gripping area 62d of the second gripping element 18d relative to the handle housing 60d. The ball 114d abuts against different points on the groove surface 116d in relation to the position of the gripping area 62d relative to the handle housing 60d. Tangential movement of the carrying element 112d is caused by the different planes of the groove surface 116d in relation to the abutment point of the ball 114d on the groove surface 116d.

[0093] If the gripping area 62d presses against the handle housing 60d with a large force against the spring force of the spring 68d, the actuating element 112d is tangentially pressed towards the rotating joint 42d via the slide surface 116d. The actuating element 112d is pressed against the internal teeth of the internal gear 110d. The actuating element 112d also has teeth in this contact area. In this state, the clutch unit 22d is closed. With the clutch unit 22d closed, torque can be applied to the actuating element 112d by the drive unit 20d via the internal gear 110d. The torque is transmitted from the actuating element 112d to the second gripping element 18d. When the internal gear 110d is driven along the drive direction 41d, a force is generated that closes the auxiliary cutting device 10d. Then, the second gripping element 18d can be advantageously and easily twisted towards the first gripping element 16d by the operator.

[0094] If the gripping area 62d is pressed open from the handle housing 60d by the spring 68d, the actuating element 112d is tangentially disengaged from the internal teeth of the internal gear 110d via the slide surface 116d and the spring 115d. In this state, the clutch unit 22d is open. If the cutting device 10d is closed with only a small force, or if the cutting device 10d is open, the actuating element 112d disengages from the internal gear 110d, and the gripping elements 16d and 18d can be twisted without the resistance of the transmission unit 38d and the drive unit 20. Manual operation occurs in this state.

[0095] The cutting device 10d also has a control unit that is not further visible. The cutting device 10d also has a force sensor 40d. The force sensor 40d is integrated into the second gripping element 18d of the gripping elements 16d and 18d. The force sensor 40c is disposed in the handle housing 60d of the second gripping element 18d. Furthermore, the force sensor 40d is coupled to the gripping area 62c of the second gripping element 18d. The force sensor 40d is disposed between the handle housing 60d and the gripping area 62d. The gripping area 62d is supported against the handle housing 60d at its free end by means of a spring 68d. The spring 68d forms part of the force sensor 40d. When the cutting device 10d is closed, the gripping area 62d swings towards the handle housing 60d against the spring force of the spring 68d. The force sensor 40d has a spring 68d and a switch 72d. The switch 72d closes when the gripping area 62d approaches the handle housing 60d to a defined degree. Force sensor 40d is installed such that when ball 114d reaches the second plane of slide surface 116d, switch 72d is closed, thereby simultaneously closing clutch unit 22d. Force sensor 40d is connected to control unit 52d.

[0096] In addition, the cutting device 10d has a stroke sensor that is not yet visible. The stroke sensor is connected to the control unit 52d.

Claims

1. A cutting device, having: At least two cutting elements that can move relative to each other (12a, 14a; 12b, 14b; 12c, 14c; 12d, 14d). Two gripping elements that can move relative to each other; as well as At least one drive unit, which is configured in at least one operating state to at least assist the movement of the second cutting element (14a; 14b; 14c; 14d) relative to the first cutting element (12a; 12b; 12c; 12d). Its features are, The at least one drive unit and transmission unit are arranged within a first gripping element of the gripping element, wherein the cutting device has at least one winch (32a; 32b) that can be driven by the drive unit, the winch being arranged within the first gripping element, wherein the cutting device has at least one force sensor (40a; 40b; 40c; 40d), the at least one force sensor being integrated within a second gripping element of the gripping element and coupled to the gripping area of ​​the second gripping element.

2. The cutting device according to claim 1, characterized in that, The drive unit and the transmission unit are oriented along the longitudinal direction of the first gripping element with their corresponding motor shafts and transmission shafts.

3. The cutting device according to claim 1 or 2, characterized in that, The system includes at least one self-converting clutch unit, which is configured to disengage the drive unit in at least one operating state in order to enable fully manual operation.

4. The cutting device according to claim 1 or 2, characterized in that, At least one rope (34a; 34b) is provided, which is at least partially wound around the winch (32a; 32b) and is at least partially tensioned between the gripping elements.

5. The cutting device according to claim 1 or 2, characterized in that, At least one self-converting clutch unit is at least partially integrated into at least one winch (32a; 32b).

6. The cutting device according to claim 4, characterized in that, At least one spring element (36a; 36b) is provided to be connected to the winch (32a; 32b), and the spring element is configured to tension the rope (34a; 34b) in at least one operating state.

7. The cutting device according to claim 1 or 2, characterized in that, The transmission unit is arranged within the first gripping element of the gripping element between the at least one drive unit and the winch (32a; 32b).

8. The cutting device according to claim 1 or 2, characterized in that, The system is equipped with at least one self-converting clutch unit, which is configured to disengage the drive unit in at least one operating state in which the drive unit is deactivated, and the clutch unit is arranged between the transmission unit and the winch (32a; 32b).

9. The cutting device according to claim 1 or 2, characterized in that, The gripping area can be movably supported relative to the base of the second gripping element.

10. The cutting device according to claim 1 or 2, characterized in that, The cutting device is a garden cutting device.

11. The cutting device according to claim 1 or 2, characterized in that, The drive unit is constructed as an electric motor.

12. The cutting device according to claim 6, characterized in that, The spring element is constructed as a helical spring.

13. A method for operating the cutting apparatus according to any one of the preceding claims, characterized in that, When the operating force exceeds the limit, the drive unit will activate the closing mechanism of the cutting device.

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