Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B25/00—Hand cutting tools involving disc blades, e.g. motor-driven
  • B26B25/002—Motor-driven knives with a rotating annular blade

Definitions

• Cutting knife in particular for cutting food
• the invention relates to a cutting knife, in particular for cutting food according to the preamble of claim 1.
• Such a cutting knife has a blade arranged rotatably about a rotation axis and an electric drive designed as an electric motor, which has a revolving rotor and a fixed stator which cooperate for driving the blade and set the blade into a rotational movement during operation of the cutting knife.
• an electric drive designed as an electric motor, which has a revolving rotor and a fixed stator which cooperate for driving the blade and set the blade into a rotational movement during operation of the cutting knife.
• Such a cutting knife is used for cutting food, especially meat or fish.
• a known from EP 0 743 145 B1 cutting blade is connected via a torque transmitting, flexible shaft with an external electric drive, wherein the flexible shaft drives a mechanical gear of the Schneidemessers via a gear in a rotating toothing on a rotating at the Cutting knife mounted blade engages.
• the flexible drive shaft displaces the gearwheel of the gearbox in a rotational movement which, by engaging in the toothing on the rotating blade, causes the blade to rotate.
• the electric drive has been moved into the handle of the cutting knife and drives via a drive shaft to a gear which engages in a circumferential toothing on a blade mounted on the cutting blade rotating.
• the electrical drive in the form of an electric motor in the grip of the cutting blade is powered by an external power supply unit in the form of a transformer with electrical power, the power supply unit is installed locally and connected via a cable of limited length with the cutting blade.
• both EP 0 689 905 B1 and EP 0 743 145 B1 provide a coupling to an external drive or an external power supply unit, so that the cutting blades are used only in a limited range around the external drive and not at arbitrary locations can, is limited in its use in range and can not be carried arbitrarily.
• the object of the present invention is to provide a cutting blade which is improved in its construction such that the drive of the blade is simplified and the handling of the cutting blade is improved.
• the invention is based on the basic idea to provide a cutting knife that uses a direct drive that does not require an additional gear for coupling the electric drive with the blade. It is envisaged that the rotor of the drive formed from the rotor and the stator is rotatably mounted and rotates about the axis of rotation, wherein the blade is coupled to the rotor and is rotated together with the rotor in a rotational movement. Rotor and stator cooperate here by an electric motor, wherein the rotor rotates in operation relative to the stator and thereby drives the blade rotatably connected to the rotor.
• a significant advantage of the arrangement according to the invention is that no additional gear for coupling the drive with the blade must be provided.
• eliminates the need for additional gears that engage in a toothing on the blade so that on the one hand, the structure of the drive and on the other hand, the geometry of the blade can be significantly simplified.
• the fact that it can be dispensed with a transmission reduces the number of consumable parts required Schneidemessers considerably, so that there is an efficient and friction, maintenance and wear-resistant cutting knife.
• Due to the fact that, moreover, no toothing has to be provided on the blade the blade can be manufactured considerably cheaper and easier, which in particular significantly reduces the costs for the operation of the cutting blade when exchanging worn or defective blades.
• the blade is rotatably mounted on the rotor, so no longer needs to be stored separately on the cutting blade, but rotates in operation rather together with the rotor to the stator.
• a lubrication of the blade is no longer required, so that it can be ruled out that lubricant in the operation of the cutting blade comes into contact with the blade, so that the hygienic conditions are significantly improved, especially when cutting living substances.
• the stator, the rotor and the blade are formed substantially annular and arranged concentrically with each other.
• the rotor can in this case be rotatably mounted on the stator via a ball bearing, in particular a ceramic ball bearing.
• a ball bearing By using such a ball bearing can be completely dispensed with a lubrication of the rotor mounted on the stator, so that a total lubrication of individual parts of the Schneidemessers is no longer required.
• an open ball bearing in particular a ceramic ball bearing or a steel ball bearing, it is also ensured that the bearing of the rotor on the stator without additional lubrication has low friction and also allows long storage life, without affecting the operational readiness of the cutting blade.
• the rotor is arranged radially inside the stator in the manner of an internal rotor and the blade is arranged radially inside the rotor on the inside of the rotor.
• the stator thus forms an outer ring on which the rotor is rotatably mounted on the inside and holds on its inside the blade.
• the coupling of the blade with the rotor is rotationally fixed, so that the blade rotates during operation of the cutting blade together with the rotor in the stator.
• the blade can be held positively or non-positively on the rotor for attachment, wherein the connection between the rotor and the blade is advantageously detachable.
• the blade is then inserted, for example, from above into the rotor and engages, for example via a snap lock with the rotor into engagement, which holds the blade against rotation.
• the snap closure can For example, be formed on formed on the rotor projections, which engage in recesses on the blade.
• connection between the rotor and the blade is such that it automatically tightens during operation of the cutting knife.
• This can for example be achieved in that the recesses on the blade, engage in the projections of the rotor for fixing, be provided with a slope which is directed counter to the direction of rotation of the rotor, so that the projections during a rotational movement of the rotor together with the Run the blade on the slope and thus fix the attachment of the blade to the rotor.
• an electric drive is provided in the manner of a direct drive, the rotor is coupled directly to the blade and thus requires no gear for driving the blade.
• electric motors with a stator and a rotor are known in principle and can be used.
• the drive can be designed, for example, in the manner of a permanently excited three-phase synchronous motor in which permanent magnets on the rotor for permanent excitation and on the stator armature windings having armature coils are arranged, which cooperate such that a Current flow through the armature coils causes a rotational movement of the rotor.
• three armature coils which are assigned to two permanent magnets of the rotor, can be arranged in an angular section of the stator in this case.
• the armature coils are then each flowed through by a sinusoidal current in the operation of the Schneidemessers, wherein the phases of the current in the armature coils of the angle section differ such that there is a rotating rotating field.
• the polarity of the permanent magnets in the angle section is selected so that in each case alternately the north pole of one permanent magnet and the south pole of the adjacent other permanent magnet from the rotor faces the stator, so that the permanent magnets generate a field excitation that cooperates with the rotating rotating field of the armature coils in that the rotor follows the rotating field of the armature coils during operation of the cutting blade.
• stator According to the principle of a synchronous motor is thus generated in the stator by feeding the armature coils a rotating rotating field that cooperates with the field of the permanent magnets of the rotor for driving the rotor, wherein the rotor rotates synchronously with the rotating field of the stator.
• the stator is here as magnetic inference formed and has teeth, each carrying an armature coil for generating the rotating field of the stator.
• the armature coils of the stator are supplied with a phase-connected sinusoidal current, resulting in a rotating rotating field on the stator.
• the supply of the armature coils in this case via an arranged in the handle of Schneidermessers electronic control device, which takes on the one hand, the power and control of the electric motor, on the other hand, but also the entire operation control of the Schneidemessers.
• the fact that the electronic control device is arranged in the handle of the cutting blade, on the one hand a space-saving arrangement for the electronic control device can be provided and on the other hand, a complete encapsulation of the electronic control device can be provided by the electronic control device is enclosed and covered by the handle.
• Such encapsulation of the electronic control device is particularly advantageous in order to avoid the entry of moisture and contaminants into the electronic control device during operation of the cutting blade.
• the housing may in this case be such that it encapsulates the stator to the outside and thus substantially gap-free to the rotor, that only the connection of the blade with the rotor is made possible, the area between the rotor and stator, in particular the bearing of the rotor on Stator is protected, however. In this way it can be prevented that impurities, for example in the form of residues of the material to be cut, can penetrate into the area of the rotor and stator.
• impurities for example in the form of residues of the material to be cut
• two switches can be arranged for switching on the cutting knife on the handle, wherein the one switch at a rear end of the handle and the other switch in a region of the handle on which a user touches in operation, for example on a bottom in a front of the handle, and the cutting blade is switched on only by a simultaneous actuation of both switches.
• Such an arrangement is particularly advantageous to ensure safe commissioning of the cutting blade, without any risk of injury from the rotating blade for a user. This is achieved by the cutting blade is switched on only by simultaneously pressing both switches, wherein the one hand of the user must be on the first switch and the second hand of the user on the second switch.
• one of the switches is designed as a proximity switch, wherein the cutting blade is only operable when a user's hand is in the vicinity of this proximity switch.
• This embodiment is advantageous for preventing the user from removing his hand from the handle of the cutting knife during operation and bringing it into the area of the blade of the cutting knife or causing the cutting knife, for example, when dropped.
• the design of the switch as a proximity switch for example as a capacitive or as a sensor exhibiting proximity switch, a control of the Schneidemessers is possible, in which the cutting blade automatically turns off when the user's hand from the proximity switch. This offers the greatest possible safety for the user during the switch-on process as well as in the operation of the cutting blade.
• the cutting blade also has a spacer which is connected via an adjusting device with a fixed portion, for example, the handle of the Schneidemessers, wherein the spacer is adjustable by means of the adjusting device in the direction of the axis of rotation relative to the blade and the adjustment on the fixed section of the cutting knife is held.
• This spacer is spaced from the blade at the fixed portion of the cutting blade and provides a measure of the depth of the cut material to be cut.
• the cut material is cut by the blade and passed between the blade and the spacer, wherein the distance between the spacer and the blade determines the depth or thickness of the cut material to be cut.
• this spacer is connected via an adjusting device with the fixed portion of the cutting blade, an advantageous connection of the spacer with the fixed portion of the cutting blade is created, in which the adjusting fulfills a dual function and on the one hand ensures the adjustability of the spacer relative to the cutting blade and on the other hand produces the connection of the spacer to the cutting blade.
• the fixed portion of the cutting knife is formed by the handle of the cutting knife on which the spacer is arranged and on which a user can grip and guide the cutting blade.
• the spacer is spaced apart from the blade mounted rotatably about the rotor on the stator.
• the blade rotates relative to the fixed spacer, the distance between the spacer and the blade defining the depth of the cut material to be cut.
• the spacer has an annular portion substantially concentric with the rotatably mounted blade, in operation passing the cut material between the annular portion and the blade and thus the distance between the annular portion of the spacer and the rotatably mounted blade sets the measure for the depth of the cut material to be cut.
• the concentrically arranged to the rotatably mounted blade, annular portion of the spacer may be connected via a bracket with the adjustment and the adjustment with the fixed, for example, formed by the handle of the cutting blade section of the cutting knife.
• the spacer thus extends over the bracket from the handle into the region of the rotatably mounted blade, so that the annular portion of the spacer is positioned as desired to the blade.
• the electric drive formed by the rotor and stator is arranged directly on the cutting blade as a direct drive.
• the cutting blade is advantageously connected to an external energy storage, which is formed for example as a capacitive accumulator with at least one capacitor for the capacitive storage of electrical energy.
• This external energy storage in the form of the accumulator can be designed to be portable, so that the accumulator can be carried in operation by a user in a simple and easy to handle manner.
• the external energy storage is here with the Cutting knife connected and supplies the cutting blade with energy.
• the energy storage can be solved by the cutting blade and charged via an external charging station.
• the accumulator can then in turn be used to supply the Schneidemessers, the operation of the Schneidemessers can be continued even in the charging time by a thatakkumulator.
• a capacitive accumulator for example, high-performance capacitors can be used which can withstand a large number of charging cycles without influencing their operating performance, require an extremely short charging time and withstand an impulse load with large currents.
• Such capacitive accumulators offer advantages over conventional electrochemical accumulators in particular in the possible number of charging cycles and the charging time.
• Fig. 1 is a perspective view of a cutting knife from the side
• FIG. 2 shows a perspective view of the cutting knife according to FIG. 1 from above;
• FIG. 3 is a perspective view of the cutting blade according to Figures 1 and 2 obliquely from above ..;
• FIG. 4 is a perspective view of the cutting blade according to Figures 1 to 3 obliquely from below ..;
• Fig. 5 is a partially cutaway perspective view of the electrical
• Fig. 6 is a partial perspective sectional view through the stator, the rotor and the blade;
• Fig. 7 is another partial sectional view of the stator, the rotor and the blade; 8 shows a schematic representation of the arrangement of the permanent magnets on the rotor and the armature coils on the stator;
• Fig. 11 a perspective view of the rotor
• FIG. 11 b lateral partial sectional view of the rotor
• FIG. 11 c shows a view of the rotor in detail IV according to FIG. 11 b;
• Fig. 12a perspective view of the blade
• Fig. 12b is a partial side sectional view of the blade
• FIG. 12c shows a view of the blade in detail VI according to FIG. 12b;
• FIG. 12d view of the blade in section V according to FIG. 12b;
• Fig. 13a is a schematic illustration of the operation of the cutting blade by a user
• Fig. 13b is an enlarged view of the operated by a user
• FIG. 14 is a perspective view of an accumulator in a
• Fig. 15 is a schematic circuit diagram of the structure of the accumulator.
• Fig. 16 is a schematic circuit diagram of the structure of the charger. 1 to 4 show an embodiment of a cutting knife 1 with a rotatably mounted on the cutting blade 1, rotatable blade 33 which rotates about a rotation axis A during operation of the cutting blade 1 and is guided by a user along a product to be cut.
• the cutting blade 1 has a handle 4, on which the user can grip and guide the cutting blade 1.
• the cutting blade 1 is used for cutting in particular food such as meat or fish, is portable and can be handled by a user with one hand.
• the user engages the cutting blade 1 on the handle 4 and guides the cutting blade 1 with the downwardly projecting blade 33 (see FIG. 1) along the material to be cut.
• the blade 33 is offset by an electric drive in a rotational movement about the axis of rotation A.
• this electric drive is designed here in the form of a direct drive, which is coupled directly to the blade 33 and adjoins the front end of the handle 4.
• the electric drive has an outer stator 31, a rotor 32 rotatably mounted to the stator 31, and a blade 33 which is non-rotatably connected to the rotor 32.
• the stator 31, the rotor 32 and the blade 33 together form a cutting device 3, the rotating blade 33 is guided during operation of the cutting blade 1 along the cutting material to be cut and with which the cutting material to be machined is sliced.
• a spacer 2 is arranged, which is coupled via an adjusting device 24 in the manner of an adjusting screw with the handle 4 and an annular portion 22 which is connected via a bracket 21 with the adjusting device 24 and arranged concentrically to the blade 33 is.
• the annular portion 22 of the spacer 2 is spaced from the blade 33, wherein the distance between the annular portion 22 and the blade 33 determines the depth or thickness of the cut material to be cut.
• the adjusting device 24 of the spacer 2 is connected to the one hand with the handle 4 and held on the handle 4 and on the other in the direction of the axis of rotation A relative to the blade 33 adjustable, so that the decency between the annular portion 22 of the spacer 2 and the blade 33 for cutting cutting material of different thickness can be changed.
• the spacer 2 is fixed to the handle 4 and exclusively in the direction of the axis of rotation A. adjustable. A displacement or an adjustment of the spacer 2 in the plane perpendicular to the axis of rotation A is excluded.
• the cutting blade 1 has a handle 4, on which a user can touch and guide the cutting blade 1. It is conceivable in this context to provide the handle 4 with handles, which can be replaced. Depending on the size of a user's hand then different handles with different diameters can be used, by means of which the handle 4 can be adjusted in diameter to the user. For example, a user with a small hand can use a small diameter grip, while a user with a larger hand uses a larger diameter grip. By using these different handles, the ease of use and the tangibility of the cutting blade 1 for a user can be improved.
• the electric drive of the cutting blade 1 is designed in the manner of a direct drive with a stator 31 and a rotor 32 and equipped with a rotatably connected to the rotor 32 blade 33, which guided during operation of the cutting blade 1 along the material to be machined is and cuts the cutting material in the desired manner.
• the stator 31, the rotor 32 and the blade 33 are substantially annular in shape and arranged concentric with the axis of rotation A, about which the rotor 32 and the blade 33 coupled to the rotor 32 are rotatable.
• the electric drive consisting of the stator 31 and the rotor 32, is formed in the embodiment of FIGS. 1 to 4 in the manner of a permanent-magnet synchronous motor and will be described in detail below. It is noted, however, that, of course, other types of electric motors, such as brush-commutated DC motors or the like, are conceivable and usable instead of the specific embodiment of the electric drive 31, 32 described here. It is essential in the presented invention that the electric drive is designed as a direct drive, in which the rotor 32 is rotatably mounted about the rotation axis A, rotatably connected to the blade 33 and in operation of the cutting blade 1 together with the blade 33 about the axis of rotation A revolves.
• FIGS. 5 to 7 8 shows a schematic diagram of the mode of operation of the permanent-magnet synchronous motor
• FIGS. 9 to 12 show views of individual components of the cutting device 3.
• the electric drive has a stator 31 and a rotor 32, which are arranged concentrically to each other, wherein the rotor 32 is mounted on the stator 31 rotatably about the rotation axis A via a ball bearing 34.
• the ball bearing 34 is designed as a ceramic ball bearing, in which ceramic balls are arranged rolling in grooves 321, 352 on the rotor 32 and on the stator 31 and provide a ball bearing between the rotor 32 and the stationary stator 31.
• the stator 32 is enclosed by a housing 35, which comprises the stator 31 and is only spaced over a narrow gap to the rotor 32 (see FIG. 7).
• the stator 31 enclosing housing 35 is fixedly connected to the stator 31 and has a bearing portion 351, in which the stator-side groove 352 is formed for the ball bearing 34.
• the ball bearing 34 for rotatably supporting the rotor 32 on the stator 31 is a low-friction, almost wear-free arrangement is created, which also requires no additional lubrication. Due to the encapsulation of the stator 31 in the housing 35 and the almost gap-free termination between the housing 35 and the rotor 32, a self-contained arrangement is further created, which has minimal gaps, in which no residues of cut material can settle. In addition, since the encapsulation of the stator 31 and the rotor 32 and in particular the protected arrangement of the ball bearing 34 between the stator 31 and rotor 32 allows easy cleaning of the cutting blade, the hygienic conditions during operation of the cutting blade are significantly improved.
• the blade 33 On the inside of the rotating in the manner of an internal rotor in the stator 31 during rotation of the cutting blade 1 around the axis of rotation A rotor 32, the blade 33 is arranged, which protrudes with a lower portion (see FIGS. 6 and 7) on the underside of the rotor 32 and can be brought into contact with the material to be cut for cutting the material to be cut.
• the spacer 2 Radially inside the blade 33, the spacer 2 is arranged with its annular portion 22 (see for example Fig. 2) and has a distance from the blade 33, which defines a measure of the depth or thickness of the cut material to be cut.
• Each tooth 310 of the stator 31 carries an armature coil 316a, 316b, 316c, each with three armature windings 317, which is fed during operation of the cutting blade 1 with a time-varying, sinusoidal current.
• the phase position of the current through the armature coils 316a, 316b, 316c differs here in the manner of a three-phase synchronous motor such that a rotating field is generated, which rotates about the stator 31.
• the rotary field generated in this way cooperates with the permanent magnets 324, 325 arranged on the rotor 32, which poles are reversed relative to one another, so that the north pole N of one permanent magnet 324 and the south pole S of the other permanent magnet 325 point towards the stator 31.
• the excitation field generated by the permanent magnets 324, 325 follows the rotating field generated by the armature coils 316a, 316b, 316c and thus causes a synchronous rotational movement of the rotor 32 about the rotational axis A subsequent to the rotating field of the stator 31.
• the direction of rotation of the rotating field can be selected and thus the direction of rotation of the blade can be specified.
• a direction of rotation of the blade 33 about the axis of rotation A counterclockwise be advantageous so that in operation of the Schneidemessers 1 upon contact of the cut material to be cut with the blade 33 at its front side facing away from the handle 4 (as is usually done) the cutting blade 1 experiences a force away from the user.
• a clockwise direction of rotation may be advantageous. It is also conceivable to design the direction of rotation by variable specification of the phase position switchable, so that during operation of the cutting blade 1, the direction of rotation can be changed.
• the arrangement of the permanent magnets 324, 325 on the rotor 32 and the armature coils 316 316b, 316c repeats periodically in each of the further angular sections, wherein the phase relationship of the currents in the armature coils 316a, 316b, 316c periodically corresponds.
• the number of permanent magnets used 324, 325 and armature coils 316a, 316b, 316c arbitrary, wherein in the illustrated embodiment, three armature coils 316a, 316b, 316c two permanent magnets 324, 325 are assigned.
• the number of armature coils 316a, 316b, 316c and permanent magnets 324, 325 may be selected, for example, depending on the power of the cutting blade 1 to be provided and the torque to be applied.
• FIGS. 9 to 12 show the components used for the electric drive in detail.
• Fig. 9 shows first a drawing of the stator 31 on which individual teeth 310 are formed.
• the stator 31 is formed of a plurality of layers of cut iron sheet, which are arranged one above the other and form a magnetic yoke for the fields generated in the stator 31 and rotor 32.
• the multilayer design of the stator 31 reduces the eddy current losses occurring in the stator 31 in a known manner.
• the armature coils 316a, 316b, 316c are arranged on the teeth 310 of the stator 31, as illustrated in Fig. 8, the armature coils 316a, 316b, 316c are arranged.
• the armature windings 317 of the armature coils 316a, 316b, 316c are arranged on bobbins 311, which are shown in individual views in FIGS. 10a to 10d are.
• the bobbins 31 1 have winding surfaces 314, on which the armature windings 317 are wound and on which the armature windings 317 are held by means of projections 313.
• the bobbin 31 1 are then inserted with the wound armature windings 317 on each a tooth 310 of the stator 31, wherein the tooth 310 engages in a corresponding opening 312 of the bobbin 311 and is held by a snap closure 315 on the stator 31.
• Fig. 11 a to 1 1 d the design of the rotor 32 is shown in detail.
• the rotor 32 which is rotatably mounted on the stator 31 via the ball bearing 34, has on its radially outward-facing side a groove 321, in which the balls of the ball bearing 34 engage to support the rotor 32 on the stator 31.
• the rotor 32 is formed substantially annular and has on its inside projections 322, which, as shown in the enlarged detail views of FIG. 1 1 c and 1 1 d, project inwardly from the inside of the rotor 32 and an oblique edge 322nd exhibit.
• the projections 322 on the rotor 32 serve to secure the blade 33 to the rotor 32.
• the formation of the blade 33 is shown in detail in FIGS. 12a to 12d.
• the blade 33 has an upper portion 332 which abuts against the rotor 32 and a lower portion 333, which is angled relative to the upper portion 332 and is sharpened to form a cutting edge.
• the lower portion 333 (see FIG. 1) is out of the Cutting device 3 and is brought into contact with the cutting material to be cut for cutting.
• recesses 331 are arranged, which can be brought to the attachment of the blade 33 on the rotor 32 with the projections 322 on the rotor 32.
• the recesses 331 also have an oblique edge 334, which corresponds in its slope to the slope of the edge 323 of the projections 322.
• the blade 33 is inserted from above (see, for example, FIG. 1) in the rotor 32, so that the inclined outer flanks of the upper portion 332 of the blade 33 to the corresponding inclined inside of the rotor 32nd (See, for example, FIG. 6) come into abutment and the recesses 331 engage with the projections 322 of the rotor 32 in engagement.
• the bevels of the edges 323, 334 on the projections 322 and the recesses 331 are such that they are formed in their slope rising against the direction of rotation of the rotor 32 and the blade 33, the recess 331 at the upper edge of the blade 33 itself So deepened against the direction of rotation of the blade 33. If the rotary blade 33 is brought into contact with the material to be cut in the feed of the cutting knife 1, the blade 33 experiences a resistance, as a result of which the blade 33 can twist slightly relative to the rotor 32.
• the protrusions 322 assigned to the recesses 331 each travel up the oblique edges 334 of the recesses 331, whereby the blade 33 is pressed into the rotor 32 and thus secured in its connection with the rotor 32.
• the connection between the blade 33 and the rotor 32 thus contracts automatically during operation of the cutting blade 1, so that a release of the connection between the blade 33 and the rotor 32 is counteracted.
• an electrical connection 41 is arranged, which serves to connect the Schneidemessers 1 with an external power supply unit.
• the switch 51 may be designed as a proximity switch and capacitively or by means of a suitable sensor detect whether a user's hand is in the operation of the cutting blade 1 in the vicinity of the switch 51.
• the cutting blade 1 may be controlled such that the cutting blade 1 automatically shuts off as soon as the user's hand moves away from the switch 51. This prevents that, for example, when the user unintentionally drops the cutting blade 1, the blade 33 continues to rotate.
• the control of the switches 51, 52 can be taken over by the control device 42 arranged in the handle 4. Furthermore, the switch 52 may be formed as a tactile and control switch, via which the speed and performance of the cutting blade 1 can be adjusted.
• the electrical supply of the cutting blade 1 is made via the electrical connection 41 provided on the handle 4. It is conceivable, for example, to connect the cutting blade 1 to an external, permanently installed supply unit, for example a transformer. It is advantageous, however, if external, portable energy storage in the form of capacitive accumulators are used for the electrical supply of the cutting blade 1, which are portable, have stored energy for the operation of the Schneidemessers 1 and after exhausting their energy reserve are rechargeable.
• FIGS. 13a, 13b and 14 An embodiment of such accumulators is shown in FIGS. 13a, 13b and 14.
• an accumulator 6 is connected via a connecting line 61 to the electrical connection 41 of the cutting blade 1 and supplies this with electrical energy.
• the accumulator 6 is portable and can be worn by a user B, for example, on the belt.
• the accumulator is, as shown in Fig. 14, suspended via a contact device 7 on the belt of the user B, wherein the accumulator 6 is held via a plug 62 in a receptacle 71 of the contact device 7 and electrically via contacts 63 with the contact device connected is.
• the connecting line 61 can be inserted via a plug into the contact device 7 so as to establish the connection of the rechargeable battery 6 to the cutting blade 1.
• the charger is, as shown in Fig. 13a, located in the immediate vicinity of the user's workplace B, the accumulator 6 via a similar contact device 7, as it is also used to connect the accumulator 6 with the cutting blade 1, with the Charger is connected (see Fig. 13a with the back of the user B to a charger, not shown, for charging arranged accumulators 6).
• the accumulators 6 are advantageously designed to be capacitive and have high-performance capacitors with capacities of the order of magnitude of 350 Farads.
• a schematic schematic diagram of a capacitive accumulator 6 is shown in Fig. 15, are connected in the capacitors C1 to C12, which are designed in particular as double-layer capacitors, each with a parallel resistor R1 to R12 in series and at the terminals +, - an output voltage which corresponds to the added voltage of the capacitances C1 to C12.
• Such capacitive accumulators 6 offer the advantage that they allow a large number of charging cycles, for example of 500,000, require a small charging time of the order of 30 to 60 seconds and also withstand a high current impulse loading load.
• the charging device 8 can be designed for a continuous output power of 900W.
• the charger 8 is designed as a switching power supply, which, contrary to a classic linearly regulated power supply with transformer and longitudinally regulated power transistors on the one hand no large and heavy toroidal transformer and on the other hand no active Cooling for the removal of the resulting waste heat to the power transistors requires.
• the charger 8 is designed as a half-bridge push-pull converter with regard to its switched-mode power supply topology and has an active power factor correction (PFC).
• PFC active power factor correction
• a line filter 81 at the AC voltage input prevents high-frequency interference from the switching power supply to the network or vice versa.
• the filtered AC voltage is rectified by a rectifier 82 in the form of a diode bridge and then passes to an input stage with an active power factor correction circuit 83 which primarily effects an upward regulation of the input voltage and at the same time provides an input current voltage substantially in phase.
• the up-regulated voltage is used to supply a DC intermediate circuit, which in turn provides the input voltage to a half-bridge push-pull converter 84 and to an auxiliary switching power supply 86. Due to the upwards regulation of the mains voltage, it is possible to operate the charger on networks with different voltages.
• the half-bridge push-pull converter 84 breaks down the DC voltage and generates a rectangular, high-frequency AC voltage, which is transmitted via a high-frequency transformer 841 to the output circuit 85 in a fixed ratio.
• the output voltage Ua which is galvanically isolated by the transformer 841, is rectified and smoothed in the output circuit 85 by a two-way rectifier 851 and a filter circuit 852.
• a pulse width modulation control circuit 88, an optocoupler 89 and a control circuit 90 are provided to control the charger 8 circuits 87 to 90 in the form of a PFC control circuit 87.
• a pulse width modulation control circuit 88, an optocoupler 89 and a control circuit 90 are provided to control the charger 8 circuits 87 to 90 in the form of a PFC control circuit 87.
• the auxiliary voltages required for the power supply of the control and monitoring circuits 87 to 90 are generated by an auxiliary switching power supply 86.

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• 2007
  • 2007-03-08 DE DE102007012287A patent/DE102007012287A1/de not_active Withdrawn
  • 2007-03-08 DE DE202007018892U patent/DE202007018892U1/de not_active Expired - Lifetime
• 2008
  • 2008-03-10 AT AT08717549T patent/ATE528113T1/de active
  • 2008-03-10 CN CN200880007598A patent/CN101663139A/zh active Pending
  • 2008-03-10 EP EP08717549A patent/EP2132009B8/de not_active Not-in-force
  • 2008-03-10 CA CA002679693A patent/CA2679693A1/en not_active Abandoned
  • 2008-03-10 ES ES08717549T patent/ES2375182T3/es active Active
  • 2008-03-10 BR BRPI0808695-8A patent/BRPI0808695A2/pt not_active IP Right Cessation
  • 2008-03-10 WO PCT/EP2008/052802 patent/WO2008107490A1/de not_active Ceased
  • 2008-03-10 JP JP2009552219A patent/JP2010519997A/ja active Pending
  • 2008-03-10 US US12/528,834 patent/US8505207B2/en not_active Expired - Fee Related
  • 2008-03-10 RU RU2009133231/02A patent/RU2009133231A/ru unknown
  • 2008-03-10 AU AU2008223805A patent/AU2008223805B2/en not_active Ceased

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