FI2258163T3 - Shears for cutting branches - Google Patents

Abstract

The gardening shears (1), for cutting branches, has moving cutters (2) held by a handle (10). They are operated by a pull wire (7), which is flexible at least in sections. The wire roller (6) has a surface with an out-of-round contour for the wire to pass around. The roller carries a pinion (21) to mesh with a rack (22) at one cutter to give the closing action in cutting a branch.

Description

Description

[0001] The invention relates to shears for cutting branches, having at least two correspondingly formed cutters that are able to move in relation to one another, at least of which one is connected to a handle and at least one of which can be subjected to an actuating force via a pull wire which is flexible at least in portions, wherein the pull wire is connected to the cutter via a wire roller.

[0002] Shears for cutting branches are known from the prior art. The EP 0 895 712 B1 describes shears in which a first cutter is formed as a jaw fixed to a handle, while a second cutter formed as a cutting blade is pivotably connected to the jaw. For actuating the cutting blade, a wire roller is provided, on which a flexible pull rope engages, which is connected to an operating lever provided on the handle and which is provided for transmitting an actuating force applied by an operator. On the wire roller there is provided an eccentrically mounted chain roller which is at least partially wrapped around by a traction chain. The traction chain is in turn connected to the cutting blade and thus makes it possible to transmit the actuating force introduced onto the wire roller and the chain roller connected thereto to the cutting blade. As a result of the eccentric arrangement of the chain roller relative to the wire roller, a variable force transmission is made possible, which permits adaptation to a distribution of the cutting force which results when cutting branches. The variable force transmission enables a user to conveniently actuate the shears for cutting branches, since, despite the change in the cutting force over the cutting distribution, a substantially constant actuating force has to be applied.

[0003] The German published patent application DE 19 11 737 A1 discloses a device for cutting out trees, in which a shears are fastened to the upper end of a rod. In this case, the shears are fastened to a hinge located on the rod via a rotary part located on a cutter arm. The rotary part makes it possible to rotate the shears in different angular orientations about a revolution axis which is perpendicular with respect to the rod. The shearing mechanism can be operated by means of a cable from the end of the rod remote from the shears. For this purpose, the cable is fastened directly to the cutter and is guided there via two guide rollers, the first guide roller being mounted on the rotary part and the second on the hinge. In order to avoid that the force transmitted to the shearing mechanism is not influenced by the different orientation of the shears, the diameters of the two guide rollers and the position of their axes are fixed in such a way that the part of the cable tensioned between them coincides exactly with the revolution axis.

[0004] The object underlying the invention is to realize shears of the type mentioned at the outset with improved handling.

[0005] The solution according to the invention is described in independent claim 1.

[0006] Independently of the present invention, it is provided that the wire roller has a noncircular contour in a wrapping surface determined by the pull wire. All objects rotatable about a revolution axis which are suitable for receiving a pull wire provided for a force transmission are referred to as wire roller. The term wire roller is not to be understood as limiting, but rather the wire roller can be configured in particular as a roller, disk, cuboid, cube or as a combination of such geometries. In order to enable a force transmission from the pull wire to the wire roller, the pull wire is connected to the wire roller in an end region and wraps around the wire roller at least in portions. A variation of an effective radius caused by the noncircular contour of the wrapping surface is decisive for the force transmission between the pull wire and the wire roller. The effective radius is determined by the distance between a revolution axis of the wire roller and a detachment point at which the pull wire protrudes from the wire roller and there is no further wrapping or no further contact between 1 the wire roller and the pull wire. A noncircular contour is present if the wrapping surface has a contour deviating from a circular shape, which may in particular be oval or polygonal. A wrapping surface is generated by radial vectors which run orthogonally to a revolution axis of the wire roller and are aligned perpendicularly to a central longitudinal axis of the pull wire. The effective radius forms the lever arm, which is important for introducing the actuating force onto the wire roller and thus at least partially for the force transmission of the actuating force applied by the user to the cutters. A change in the effective radius, due to the noncircular contour of the wrapping surface, results in a change in the force transmission during a revolution of the wire roller and, associated therewith, in the rolling up or unrolling of the pull wire onto the wire roller.

[0007] Typically, the wire roller is configured only for an incomplete wrapping by the pull wire, in which case the wrapping surface can be formed as a wrapping plane. However, it is also conceivable for the wire roller to be formed for more than one wrapping by the pull wire, in which case the wrapping surface can be formed, for example, as a helical surface. As a result of the noncircular contour of the wrapping surface, the effective radius can be varied over a wide spectrum and thus permits a favourable adaptation of the variable force transmission to the distribution of the cutting force determined substantially by a geometry of the cutters and of the branches to be cut.

The contour of the wrapping surface can be designed in particular as a polygon or sequence of straight and curved regions. It is crucial that, due to the noncircular contour of the wrapping surface, at least two different effective radii are realized on the wire roller.

[0008] Independently of the present invention, the contour of the wire roller in the wrapping surface has a bending distribution with at least two bending radii which differ from one another. Such a design of the wire roller achieves a particularly advantageous adaptation to the cutting force need which vary during the branch cutting process. Particularly when using bends continuously meshing into each other, the occurrence of force jumps can be at least largely avoided, as a result of which a particularly comfortable operation of the shears can be achieved.

[0009] According to the invention, a gear device is provided between the wire roller and the cutter.

A gear device enables an additional force transmission of the actuating force applied by an operator between the wire roller and the cutter for increasing a cutting force of the cutter. The gear device can in particular be formed as a transmission with a constant or varying gear ratio.

[0010] According to the invention, the gear device has a rack attached to the wire roller and a corresponding rack on at least one cutter. By designing the gear device as a combination of corresponding racks, a particularly compact design of the gear device can be realized. In addition, a nearly loss-free force transmission between the wire roller and the cutter can be realized by means of corresponding racks. Through the use of corresponding racks, in particular a high gear ratio between the wire roller and the cutter can be achieved with a compact design.

[0011] In a further embodiment of the invention, the rack on the wire roller is formed as a gear segment or gear wheel that is mounted coaxially to a revolution axis of the wire roller. By using a gear segment or a gear wheel on the wire roller, the revolution movement exerted by the wire roller about the revolution axis and an associated torque can be transmitted in a particularly advantageous manner to the at least one cutter, which is provided with a correspondingly formed rack. In a preferred embodiment of the invention, the gear segment or the gear wheel is provided with a uniform rack and thereby ensures a substantially continuous gear ratio between the wire roller and the operatively connected cutter. The gear segment or the gear wheel can in particular be provided integrally on the wire roller. The wire roller can in particular be formed as a plastic injection- moulded part, as a metal injection-moulded part or as a shaped part produced by powder metallurgy.

In a preferred embodiment of the invention, the gear wheel is made of a metallic material and is 2 surrounded by the wire roller formed as a plastic part sectionally in a force-fitting and/or form- fitting manner, preferably injection-moulded around as an insert part in the plastic injection moulding process.

[0012] In a further embodiment of the invention, the rack on at least one cutter is formed at least as a gear segment. The use of a rack configured as a gear segment on the at least one cutter is particularly suitable when the cutter is arranged rotatably relative to the second cutter and a centre point of the gear segment is arranged coaxially to a revolution axis between the cutters. In this case, the gear segment can be integrally formed on the at least one cutter. Punching and laser cutting are particularly suitable as production methods for the cutter, which is formed in particular as a metal part. If particularly high demands are made on the cutter, production by die forging process or as a powder-metallurgical shaped part is also conceivable.

[0013] In a further embodiment of the invention, the pull wire is designed as a pull rope. As a result, a particularly cost-effective and advantageous design of the pull wire can be achieved. Pull ropes, plastic ropes or ropes made of natural fibres and combinations thereof are used in particular as pull ropes. The pull rope can be housed with an end region on the wire roller in a form-fitting and/or force-fitting manner. At an end facing away from the wire roller, the pull rope can be provided with an operating part in the manner of a cable sling, which allows easy gripping by the operator.

Alternatively, it can be connected to an operating part configured as an actuating handle, which in particular is attached to the handle so as to be pivotable and/or displaceable. The rope sling or the actuating handle make it possible for the user to introduce the actuating force onto the traction rope.

[0014] In a further embodiment of the invention, the pull wire is substantially guided in an at least nearly closed cavity formed by the handle and a cutting housing associated with the handle. This ensures that when the shears are used for cutting branches, the pull wire does not get entangled in the branches or branch work, as a result of which the use of the shears would be made more difficult. In addition, the guide of the pull wire in an at least nearly closed cavity reduces the risk of, for example, the fingers of the operator getting trapped, so that a particularly advantageous operating reliability is ensured.

[0015] In a further embodiment of the invention, a receptacle for the wire roller and at least one cutter are provided in the cutting housing. The cutting housing, which can be produced in particular by plastic injection moulding, has receptacles for the wire roller and at least one of the cutters.

These receptacles can in particular be formed as axle stubs or screw receptacles. Corresponding receptacles in the cutting housing ensure a particularly advantageous and cost-effective assembly, an advantageous flow of force as well as a high stability of the shears and an advantageous guide of the shears. The cutting housing can in particular be formed in two parts, it being possible for corresponding receptacles for the wire roller and at least one cutter to be provided in each of the components in order to ensure that the operating forces and reaction forces resulting therefrom are applied as symmetrically as possible.

[0016] According to the invention, the pull wire is arranged at least in portions in the region of a hinge device provided between the handle and the cutter connected thereto coaxially to a hinge axis of the hinge device. The hinge device is provided in order to allow a bending of a cutting region formed by the two cutters relative to the handle and thus to allow an adaptation of the shears to different cutting tasks. By sectional arrangement of the pull wire coaxially to a hinge axis of the hinge device, a pivoting of the cutting region with respect to the handle is made possible without an extension or shortening of the pull wire thereby occurring. This ensures that, irrespective of the pivoting of the cutting region relative to the handle, the same cutting region is always available between the cutters. 3

[0017] In a further embodiment of the invention, the hinge device is formed at least substantially in the cutting housing and the hinge axis is aligned substantially parallel to a cutting plane determined by the cutters. As a result, a particularly effective bending of the cutting region relative to the handle can be realized. The accommodation of the hinge device in the cutting housing permits a particularly cost-effective design. In contrast to the handle, which ca substantially be formed as a cylindrical tube, the cutting housing is in any case provided with that for receiving the wire roller and the at least one cutter. A production method for the cutting housing, which is carried out in particular as a plastic injection moulding method, allows the hinge device to be formed without significantly higher production costs being incurred as a result. As a result of the alignment of the hinge axis substantially parallel to the cutting plane, a particularly effective bending in a small space is achieved, which is advantageous for the use of the shears.

[0018] In a further embodiment of the invention, at least one deflecting device is associated with the cutting housing for a sectional alignment of the pull wire coaxial to the hinge axis. The deflecting device, which in particular can be formed as a deflecting roller mounted rotatably in the cutting housing, makes it possible in a simple manner to align the pull wire coaxially with respect to the hinge axis. As a result, a particularly low-friction transmission of the actuating force via the pull wire on the wire roller is also ensured in the region of the hinge axis. Guide portions fixedly connected to the cutting housing, for example sliding rails, on which the pull wire is deflected, are also conceivable, as a result of which a particularly simple design of the deflecting device can be realized.

[0019] The wire roller and the hinge axis are preferably located in the cutting plane or at a short distance parallel thereto. The revolution axis of the wire roller is aligned perpendicular to the cutting plane. A housing surrounding the wire roller has an extension in the direction of the axis of the wire roller which, in a preferred embodiment of the invention, amounts to a maximum of 50% of the maximum housing dimension in the direction of the hinge axis. In a preferred embodiment, the maximum extension of the housing in the direction of the axis of the wire roller is at most 50% greater than the diameter of a tube serving as a stem.

[0020] According to the invention, at least two gear stages are provided, which are advantageously formed by different types of gear, wherein the first gear stage can preferably implement a variable force transmission, while the second gear stage realizes a constant or variable force transmission.

By means of the at least two gear stages, an effective and structurally simple transmission of the operating force applied by the operator is achieved in order to be able to apply a high cutting force to the cutters. For this purpose, it can be provided that in the first gear stage, which can be realized, for example, between the pull wire and the gear wheel mounted on the wire roller, a variable force transmission takes place, which is realized by the noncircular contour of the wire roller. For the second gear stage, either a constant or a variable force transmission can be provided, which depends in particular on the type of force transmission to the cutter. If the torque present on the wire roller is transmitted via a gear transmission, a constant transmission is provided for the second gear stage. If a force transmission in the second gear stage takes place, for example, via a lever gear, a variable gear ratio is easier to realize.

[0021] In a further embodiment of the invention, the first gear stage has a gear ratio of at least 2 : 1 between the output and input operating force. In the case of variable force transmission, a range of the gear ratio variation of at least 20% preferably occurs. The gear ratio is selected such that at least a doubling of the operating force transmitted via the pull wire and applied by the user is realized in the first gear stage. For example, a diameter of the gear wheel mounted on the wire roller is at most 50% of the minimum effective radius of the noncircular wire roller. In addition, in the case of 4 variable force transmission, it can be provided that, due to the noncircular contour of the wire roller, a change of the effective radius and thus of the gear ratio in the first gear stage by at least 20% occurs. This results in a significant change in the force transmission in portions in the direction of a force amplification by at least twenty percent.

[0022] In a further embodiment of the invention, the second gear stage has a gear ratio of at least 2 : 1 between the output and input operating force. As a result, at least a further doubling of the input operating force also takes place in the second gear stage, so that, in combination with the first gear stage, at least a quadrupling of the operating force applied by the user is realized overall. In this way, a variable force transmission between an operating part to be actuated by the operator and the at least one cutter controlled by the pull wire via the gear device can be achieved in an advantageous manner.

[0023] In a further embodiment of the invention, the first and the second gear stages each have a gear ratio of at least 3.5 : 1 between the output and input operating force, wherein, in the case of variable force transmission in the first gear stage, a range of the gear ratio variation of at least 20% is optionally provided. The gear device thus makes it possible to amplify the input operating force more than 10 times. The variation of the operating force in the first gear stage ensures a simple configuration of the gear device, since the transmission of the operating force, which has already been adapted to the varying distribution of the cutting force, to the second gear stage can preferably take place by means of a constant gear ratio.

[0024] In addition, the pull rope can advantageously be fastened with its end facing the user to a pulley arrangement which can bring about a further force transmission in a manner known from EP 0 895 712 B1 and is preferably guided in a tube.

[0025] Further advantages and features of the invention emerge from the claims as well as from the following description of a preferred exemplary embodiment of the invention, which is illustrated with reference to the drawings, Wherein

Fig. 1 shows a perspective view of shears according to the invention, in which one half of the cutting housing is removed,

Fig. 2 shows a planar, schematic sectional view of a wire roller for shears according to Fig. 1; and

Fig. 3 shows a planar, schematic representation of a side view of the wire roller according to Fig. 2,

Fig. 4 shows a planar view of the shears on the cutting side,

Fig. 5 shows a planar view of the shears on the stem side.

[0026] Shears 1 for cutting branches has cutters 2 which delimit a cutting region 3 formed as a cutting plane, into which objects to be cut, in particular branches, can be accommodated. A fixed blade 4 and a pivoting blade 5 are provided as cutters 2, which are pivotably connected to one another via a connecting bolt 12 provided with a securing nut 13. The cutting region 3 is bordered substantially by the respectively mutually facing blade regions of the fixed blade 4 and of the pivoting blade 5 and describes the one zone in which a relative movement of the fixed blade 4 with respect to the pivoting blade 5 can take place for cutting objects. The relative movement of the cutters 2 in relation to one another can be used for cutting cut material, in particular tree branches.

[0027] The fixed blade 4 is connected via screw connections 14 to a cutting housing 9, which is provided for receiving further components of the shears and is connected to a handle 10. The handle is substantially formed as a cylindrical tube and is provided for gripping the shears 1 during operation by a user. In an end region, not depicted, of the handle 10 facing away from the cutting housing 9, an actuating handle, in particular formed as a sliding handle or pivoting lever, is provided, which is connected to a pull wire formed as a pull rope 7. The actuating handle enables the user to introduce the actuating force onto the pull rope 7 by means of a linear movement, a pivoting movement or a combination thereof.

[0028] A wire roller 6 is rotatably housed on a bearing bolt 15 in the cutting housing 9 and is connected to the pull rope 7. The pull rope 7 is in each case deflected substantially at right angles via two deflecting rollers 8 and is operatively connected to the actuating handle, not depicted, at an end of the handle 10 facing away from the cutting housing 9. The deflecting rollers 8 are each rotatably mounted on bearing pins 16 and enable a low-friction force transmission from the actuating handle via the pull rope 7 to the deflecting roller 8. At an end region of the cutting housing 9 facing the handle 10 there is provided a hinge device 11, represented at least partially in section, which is constructed from a substantially T-shaped axle tube 17 fixedly connected to the handle 10, a locking button 18 and a sliding bearing 19 provided on the cutting housing 9 corresponding to the axle tube 17. The hinge device 11 enables the cutting housing 9 to be pivoted about a hinge axis 20, wherein a pivoting range of at least +/— 30 degrees is provided with respect to the starting position represented in Fig. 1.

[0029] In the region of the hinge device 11, the pull rope 7 is guided through the deflecting rollers 8 concentrically to the hinge axis 20, so that no extension or shortening of the pull rope 7 takes place during a pivoting movement of the cutting housing 9 about the hinge axis 20. Thus, irrespective of the pivot angle of the cutting housing 9 with respect to the handle 10, the same cutting region 3 is always ensured. In order to minimize the influence of the pivot angle of the cutting housing 9 with respect to the handle 10 on the length of the pull rope 7, one of the deflecting rollers 8 is fastened in the axle tube 17, while the second deflecting roller 8 is mounted in the cutting housing 9. Thus, when the cutting housing 9 is bent relative to the handle 10, only a torsion of the pull rope 7 in the hinge axis 20 takes place. However, this torsion causes at least nearly no lengthening or shortening of the pull rope 7, so that a pivoting of the cutting housing remains without effects on the cutting region 3 of the shears 1.

[0030] The wire roller 6, which is represented in more detail in Fig. 3, has a gear wheel 21 which is fastened to the wire roller in a form-fitting and force-fitting manner and which is fitted onto the bearing bolt 15. The gear wheel 21 has a uniform rack arranged concentrically with the bearing bolt 15. A gear segment 22 provided integrally on the pivoting blade 5 is in a form-fitting operative connection with the gear wheel 21, wherein the gear segment 22 is likewise provided with a uniform rack and is arranged concentrically with the connecting bolt 12.

[0031] According to the view of Fig. 2, which represents a sectional view of the wire roller 6 according to Fig. 1, it is provided that a support region 23 wrapped around by the pull rope 7 has a noncircular contour in the wrapping surface determined by the pull rope 7, which in the present case is formed as a wrapping plane 24. The wrapping plane 24 is generated by a set of radial vectors which extend in the radial direction orthogonally from the revolution axis 26 and respectively perpendicularly to the central longitudinal axis 27 of the pull rope 7. The effective radii RO, Rmax and R2 are depicted as examples of the radial vectors in Fig. 2.

[0032] The noncircular contour of the support region 23 is selected such that, in the rest position of 6 the shears 1 depicted in Fig. 1, according to the view of Fig. 2, the effective radius RO is relatively small at the detachment point 28, that is to say at the point at which the pull rope 7 protrudes from the wire roller 6 in the rest position and no further wrapping is present. For a position of the pivoting blade 5 in the cutting region 3, in which a maximum cutting force is usually required, a significantly enlarged effective radius Rmax is provided at the corresponding point of the wire roller 6, which effective radius Rmax is changed into a smaller effective radius R2 corresponding to the cutting force which decreases again in the further cutting distribution.

[0033] The effective radius (RO, Rmax, R2) corresponds to the lever arm with which the tensile force transmitted from the pull rope 7 to the wire roller 6 is converted into a torque. This torque acts on the gear wheel 21, which is fixedly connected to the wire roller 6 and is uniformly shaped and arranged concentrically with respect to the connecting bolt 12. Since the effective radius is variable due to the noncircular contour of the support region 23, the actuating force input by the pull rope 7 is also transmitted in a different way to the gear 21 and thus leads to the desired variable force transmission between the actuating handle, not depicted, and the pivoting blade 5.

[0034] As depicted in Figs. 4 and 5, the cutting housing 9 has two housing halves 29a and 29b which are joined together at a parting line 30 and are connected to one another by screw connections 14. The parting line 30 divides the cutting housing 9 substantially symmetrically in a housing region facing away from the cutters 2. In the region of the cutters 2, on the other hand, as depicted in more detail in Fig. 4, the parting line extends rearwardly along the fixed blade 4, that is to say the fixed blade 4 rests flat on the housing half 29b. This results in an asymmetrical division of the cutting housing 9 in this region. The receiving connection piece for the tubular shaped handle 10, which is formed by two semi-cylindrical sleeve portions 31 formed on the cutting housing parts 29a and 29b, is divided centrally by the parting line 30. A concave depression 32 is provided on the sleeve portion 31 associated with the cutting housing part 29b, which depression is formed for a form-fitting, torsion-free receptacle of the handle 10 on the cutting housing 9. The outer diameter of the sleeve portions 31 is approximately 90% of a width development b of the cutting housing 9. The handle 10, not depicted in Figs. 4 and 5, has an outer diameter which substantially corresponds to the width development b of the cutting housing 9.

[0035] The deflecting roller 8 is arranged centrally in the cutting housing 9, so that the pull rope 7, which is guided by the handle 10, can advantageously be deflected.

[0036] The bearing bolt 15 of the wire roller 6 and the connecting bolt 12 of the cutters 2 are arranged parallel to the plane of the view of Figs. 4 and 5. A width development b of the cutting housing 9 in the direction of the extension of the bearing bolt 15 and of the connecting bolt 12 is selected to be particularly slim for an advantageous handling of the shears 1 and permits a favourable advancement of the shears 1 even in the case of a dense branch structure. A height development h of the cutting housing 9 in the direction of the hinge axis 20 corresponds substantially to the jaw width of the shears determined by an outer contour of the cutters, as can also be seen from Fig. 1. For the embodiment of the shears depicted in Figs. 4 and 5, the width development b amounts to approximately 35% of the height development h. In a region facing the cutters 2, the cutting housing 9 is tapered in a wedge-shaped manner with respect to the width development b in the direction of the cutters 2, so that a particularly advantageous actuation of the shears can be achieved, since the wedge shape contributes to an improved penetration of dense branches. The wire roller 6 and the hinge axis 20 are preferably arranged in the cutting plane or at a short distance parallel thereto. A revolution axis of the wire roller 6 determined by the bearing bolt is oriented perpendicular to the cutting plane.

[0037] In a further embodiment of the invention, which is not depicted, it is provided that both 7 cutters are movably mounted to the cutting housing.

In this case, a first cutter has teeth facing radially outward with respect to an arcuate rack, while a second cutter has an arcuate rack aligned concentrically with the first, the teeth of which are directed radially inward.

A gear wheel connected to a wire roller is arranged between the rack of the first cutter and the rack of the second cutter in such a way that a revolution of the gear wheel leads to an oppositely directed movement of the two cutters.

Thus, using the above-described effects of a variable force transmission, shears with oppositely pivotable cutters can also be realized in an advantageous manner.

8

Claims (12)

EP 2 258 163 B1 Patent claims 1. Scissors (1) for cutting branches, where there are at least two correspondingly formed cutting blades (2) which are able to move relative to each other, at least one of which is connected to the handle (10) and of which at least one can be driven by means of a traction wire (7) which is flexible at least in parts where the traction wire (7) is functionally connected to the cutting blade (2) via the wire wheel (6), where the traction wire (7) is arranged at least partially in the area of the hinge device (11), organized by the handle (10) and the cutting blade (2) connected to the handle (10) between, concentrically with the hinge axis (20) of the hinge device (11), characterized in that at least two gear devices (21, 22) are arranged, the gear device (21, 22) being arranged between the wire roll (6) and the cutting blade (2), said the gear device (21, 22) being specially designed for transferring power to increase the cutting force of the cutting blade (2), the gear device including a gear wheel (21) attached to a wire roller (6) and a corresponding rack (22) on top of at least one cutting blade (2). 2. Scissors according to claim 1, characterized in that the gear wheel on the wire roll (6) is configured as a gear segment or gear disc (21), which is especially formed as a whole and installed concentrically with the rotation axis (15) of the wire roll (6). 3. Scissors according to claim 1 or 2, characterized in that the rack is formed on top of at least one cutting blade (2) as at least a specially formed gear wheel segment (22) as a whole. 4. Scissors according to any of the preceding claims, characterized in that a pulling rope is designed as the pulling wire (7). 5. Scissors according to any of the preceding claims, characterized in that the draw wire (7) is essentially guided in at least an almost closed cavity formed by the handle (10) and the cutting housing (9) connected to the handle (10). 6. Scissors according to claim 5, characterized in that a nest for a thread roll (6) and at least one cutting blade (2) are arranged in the cutting case (9). 1 EP 2 258 163 B1 7. Scissors according to claim 5, characterized in that the hinge device (11) is formed at least essentially in the cutting housing (9) and the hinge axis (20) is oriented essentially parallel to the cutting plane (3) defined by the cutting blades (2). 8. Scissors according to claim 5, characterized in that at least one direction-changing device (8), especially a direction-changing roller, is placed in the cutting housing (9) to align the part of the draw wire (7) concentrically with the hinge axis (20). 9. Scissors according to claim 1, characterized in that the first gear device (6, 7) preferably provides an adjustable power transmission, while the second gear device (21, 22) provides a constant or adjustable power transmission. 10. Scissors according to claim 1 or 9, characterized in that the first gear device (7, 21) has a gear ratio of at least 2:1 between the outgoing and applied driving force, and in particular the adjustment range of the gear wheels is at least 20%. 11. Scissors according to claim 1, characterized in that the second gear device (21, 22) has a gear ratio of at least 2:1 between the outgoing and applied driving force. 12. Scissors according to claim 1 or 9, characterized in that the first (7, 21) and the second (21, 22) gear device each have a gear ratio that is at least 3.5:1 between the output and applied driving force, where in the first gear device ( 7, 21) is optionally arranged to adjust the gear ratio by at least 20%. 2