EP3578311A1 - Setting device - Google Patents

Abstract

Setting tool 10 for driving fasteners 30 into a subsurface, in particular a hand-operated setting tool, having a receptacle 20 which is intended to receive a fastening element, a driving element 60 which is intended to insert a fastening element received in the receptacle along a setting axis A into the To convey underground, a drive which is intended to drive the drive-in element along the setting axis onto the fastening element, the drive having an electrical capacitor 300, a short-circuit rotor 90 arranged on the drive-in element and an excitation coil 100 which is used for rapid discharge of the capacitor is flowed through with current and generates a magnetic field which accelerates the driving element on the fastening element, and wherein the setting device has a control unit 150 which is suitable for performing a fuse discharge of the capacitor, in which current is not flowing through the excitation coil.

Description

The present invention relates to a setting device for driving fasteners into a substrate.

Such setting tools usually have a receptacle for a fastening element, from which a fastener received therein is conveyed along a setting axis into the ground. A driving element is for this purpose driven by a drive along the setting axis to the fastener.

From the US 6,830,173 B2 is a setting tool with a drive for a drive element known. The drive has an electrical capacitor and a coil. To drive the driving element, the capacitor is discharged via the coil, whereby a Lorentz force acts on the driving element, so that the driving element is moved towards a nail.

The object of the present invention is to provide a setting device of the aforementioned type, in which a high efficiency and / or a good setting quality is ensured.

The object is achieved in a setting tool for driving fasteners into a substrate, comprising a receptacle, which is intended to receive a fastener, a driving element, which is intended to convey a recorded in the receiving fastener along a setting axis in the ground a drive, which is provided for driving the driving element along the setting axis on the fastening element, wherein the drive comprises an electrical capacitor, arranged on the driving element squirrel cage and an excitation coil, which in a rapid discharge of the capacitor with Current is flowed through and generates a magnetic field which accelerates the driving element to the fastening element, and wherein the setting device has a control unit which is adapted to perform a fuse discharge of the capacitor, in which the exciting coil is not traversed by current. This makes it possible to discharge the capacitor without expelling a fastener from the setting tool. The setting tool is preferably handheld used. Alternatively, the setting device can be used stationary or semi-stationary.

A capacitor in the sense of the invention is to be understood as meaning an electrical component which stores electrical charge and the energy associated therewith in an electric field. In particular, a capacitor has two electrically conductive electrodes, between which the electric field builds up when the electrodes are electrically charged differently. Under a fastener according to the invention, for example, a nail, a pin, a clip, a clip, a bolt, in particular threaded bolt or the like to understand.

An advantageous embodiment is characterized in that the control unit is operable in a normal operation and in a backup operation, and wherein the control unit is adapted to carry out a rapid discharge in the normal operation and perform the backup discharge in the backup operation.

An advantageous embodiment is characterized in that the drive has a circuit comprising a discharge switch, wherein the control unit is adapted to close in normal operation, the discharge switch to bring about the rapid discharge, and wherein the control unit comprises a fuse switch and is suitable to close the fuse switch in the fuse mode to effect the fuse discharge.

An advantageous embodiment is characterized in that the setting device has a detection means for detecting a state parameter of the setting device, wherein the control unit is provided for switching to the safety mode depending on the detected state parameter.

An advantageous embodiment is characterized in that the setting device has a means for detecting a duration during which the capacitor is already electrically charged, wherein the detected state parameter comprises the detected duration. Preferably, the control unit has the means for detecting the duration.

An advantageous embodiment is characterized in that the setting device has a means for detecting a mechanical load variable of the setting device, wherein the detected state parameter comprises the detected load variable of the setting device. Preferably, the detected mechanical load variable is an acceleration of the setting device, particularly preferably a recoil of the setting device, while a fastener is driven into the ground.

An advantageous embodiment is characterized in that the setting device has a means for detecting a charging voltage of the capacitor, wherein the detected state parameter comprises the charging voltage of the capacitor. Preferably, the control unit is provided to go into the backup mode when the charging voltage of the capacitor exceeds a predetermined limit voltage.

An advantageous embodiment is characterized in that the setting device has a means for detecting a temperature of an environment and / or the setting device, wherein the detected state parameter comprises the detected temperature. Preferably, the detected temperature is a temperature of the exciting coil.

An advantageous embodiment is characterized in that the setting device has a means for detecting a removal of a component of the setting device, wherein the detected state parameter is the absence of the component of the setting device. Preferably, the means for detecting a removal of a housing part or an electric battery of the setting device is suitable.

An advantageous embodiment is characterized in that the control unit has an electrical resistance, which is flowed through during the fuse discharge of the capacitor with current. The electrical resistance preferably comprises a resistance network.

An advantageous embodiment is characterized in that the setting device has an electric battery, which is flowed through during the fuse discharge of the capacitor with electricity and charged. Preferably, the control unit comprises a bidirectional switching converter, which converts a battery current into a capacitor charging current for charging the capacitor and converts a discharge current of the capacitor into a battery charging current for a fuse discharge of the capacitor. Particularly preferably, the bidirectional switching converter comprises one or more rectifier switches, which are closed in order to bring about and control the fuse discharge.

An advantageous embodiment is characterized in that the control unit is adapted to control the amount of energy of the current flowing through the exciter coil in the fast discharge of the capacitor in dependence on the detected state parameter.

An advantageous embodiment is characterized in that the capacitor is charged at the beginning of the fast discharge with a charging voltage, wherein the control unit is adapted to control the charging voltage. Preferably, the capacitor is charged prior to the fast discharge in a charging process, wherein the charging process is controlled by the control unit.

In the drawings, the invention is shown in several embodiments.

Fig. 1

ein Setzgerät in einem Längsschnitt,

Fig. 2

ein Schaltdiagramm eines Setzgeräts,

Fig. 3

ein weiteres Schaltdiagramm eines Setzgeräts,

Fig. 4

ein weiteres Schaltdiagramm eines Setzgeräts,

Fig. 5

ein weiteres Schaltdiagramm eines Setzgeräts und

Fig. 6

ein weiteres Schaltdiagramm eines Setzgeräts,

Show it:

Fig. 1

a setting device in a longitudinal section,

Fig. 2

a circuit diagram of a setting device,

Fig. 3

another circuit diagram of a setting device,

Fig. 4

another circuit diagram of a setting device,

Fig. 5

another circuit diagram of a setting device and

Fig. 6

another circuit diagram of a setting device,

In Fig. 1 is a hand-held setting tool 10 for driving fasteners shown in a background, not shown. The setting tool 10 has a receptacle 20 designed as a pin guide, in which a fastening element 30 embodied as a nail is received in order to be driven into the underground along a setting axis A (in FIG Fig. 1 to the left). For a supply of fastening elements to the receptacle, the setting device 10 comprises a magazine 40 in which the fastening elements are accommodated individually or in the form of a fastener element strip 50 and are transported gradually into the receptacle 20. The magazine 40 has for this purpose an unspecified spring-loaded feed element. The setting device 10 has a drive-in element 60, which comprises a piston plate 70 and a piston rod 80. The driving-in element 60 is intended to transport the fastening element 30 out of the receptacle 20 along the setting axis A into the ground. Here, the driving element 60 is guided with its piston plate 70 in a guide cylinder 95 along the setting axis A.

The driving element 60 in turn is driven by a drive which comprises a squirrel cage 90 arranged on the piston plate 70, an excitation coil 100, a soft magnetic frame 105, a circuit 200 and a capacitor 300 with an internal resistance of 5 mOhm. The short-circuit rotor 90 consists of a preferably annular, particularly preferably annular element with a low electrical resistance, for example copper, and is fastened on the side facing away from the receptacle 20 side of the piston plate 70 on the piston plate 70, for example, soldered, welded, glued, clamped or positively connected. In embodiments not shown, the piston plate itself is designed as a squirrel-cage rotor. The circuit 200 is intended to cause a rapid electrical discharge of the previously charged capacitor 300 and to guide the discharge current flowing through it through the excitation coil 100, which is embedded in the frame 105. The frame preferably has a saturation flux density of at least 1.0 T and / or an effective specific electric conductivity of at most 10 ⁶ S / m, so that a magnetic field generated by the exciting coil 100 is amplified by the frame 105 and suppress eddy currents in the frame 105 become.

In a settable position of the driving element 60 (FIG. Fig. 1 ) immerses the driving member 60 with the piston plate 70 so in an unspecified annular recess of the frame 105, that the squirrel cage rotor 90 is disposed at a small distance from the exciter coil 100. As a result, an exciter magnetic field, which is generated by a change in an electrical exciter current flowing through the excitation coil, passes through the squirrel cage rotor 90 and in turn induces an annular secondary electric current in the squirrel cage rotor 90. This developing and thus changing secondary current in turn generates a secondary magnetic field, which is opposite to the excitation magnetic field, whereby the squirrel cage rotor 90 experiences a repelling of the excitation coil 100 Lorentz force which drives the driving element 60 on the receptacle 20 and the fastener 30 received therein ,

The setting tool 10 further comprises a housing 110, in which the drive is received, a handle 120 with a designed as a trigger actuator 130, designed as a battery electric energy storage 140, a control unit 150, a trigger switch 160, a pressure switch 170, as an means for detecting a temperature of the exciter coil 100 and electrical connection lines 141, 161, 171, 181, 201, 301, which are formed by the temperature sensor 180 and which contain the control unit 150 with the electrical energy store 140, the trigger switch 160, the contact pressure switch 170, the temperature sensor 180, the Circuit 200 or the capacitor 300 connect. In embodiments not shown, the setting tool 10 is supplied instead of the electrical energy storage 140 or in addition to the electrical energy storage 140 by means of a power cable with electrical energy. The control unit comprises electronic components, preferably interconnected on a circuit board to one or more control circuits, in particular one or more microprocessors.

When the setting tool 10 to a substrate, not shown (in Fig. 1 pressed on the left), presses an unspecified contact the pressing switch 170, which thereby transmits a pressing signal to the control unit 150 by means of the connecting line 171. From this triggered, the control unit 150 initiates a capacitor charging process, in which electrical energy is conducted by means of the connecting line 141 from the electrical energy storage 140 to the control unit 150 and by means of the connecting lines 301 from the control unit 150 to the capacitor 300 to charge the capacitor 300 , For this purpose, the control unit 150 comprises a switching converter (not designated in more detail) which converts the electric current from the electrical energy store 140 into a suitable charging current for the capacitor 300. When the capacitor 300 is charged and the driving element 60 in its in Fig. 1 is shown set ready position, the setting tool 10 is in a state ready for setting. Characterized in that the charging of the capacitor 300 is effected only by the pressing of the setting device 10 to the ground, a setting process is only possible to increase the safety of bystanders when the setting tool 10 is pressed against the ground. In embodiments not shown, the control unit initiates the capacitor charging process already when the setting device is switched on or when the setting device is lifted off the ground or at the end of a preceding driving operation.

If the actuating element 130 is actuated when the setting tool 10 is ready for setting, for example by pulling with the index finger of the hand, which encompasses the handle 120, the actuating element 130 actuates the trigger switch 160, which thereby transmits a triggering signal to the control unit 150 via the connecting line 161. From this, the control unit 150 initiates a capacitor discharging operation in which electrical energy stored in the capacitor 300 is conducted from the capacitor 300 to the exciting coil 100 by means of the switching circuit 200 by discharging the capacitor 300.

The in Fig. 1 Schematically illustrated circuit 200 for this purpose comprises two discharge lines 210, 220 which connect the capacitor 300 to the excitation coil 200 and of which at least one discharge line 210 is interrupted by a normally open discharge switch 230. The circuit 200 forms an electrical resonant circuit with the exciter coil 100 and the capacitor 300. A swinging back and forth of this resonant circuit and / or a negative charging of the capacitor 300 may have a negative effect on an efficiency of the drive, but can be prevented by means of a freewheeling diode 240. The discharge lines 210, 220 are electrically connected by means of one of the receptacle 20 facing the end face 360 of the capacitor 300 electrical contacts 370, 380 of the capacitor 300, each with an electrode 310, 320 of the capacitor 300, for example by soldering, welding, screwing, jamming or form-fitting. The discharge switch 230 is preferably suitable for switching a discharge current with high current and is designed, for example, as a thyristor. In addition, the discharge lines 210, 220 have a small distance from one another, so that a parasitic magnetic field induced by them is as small as possible. For example, the discharge lines 210, 220 are combined into a bus bar and held together by a suitable means, for example a holder or a clamp. In embodiments not shown, the freewheeling diode is electrically connected in parallel to the discharge switch. In further embodiments, not shown, no free-wheeling diode is provided in the circuit.

To initiate the capacitor discharge process, the control unit 150 closes the discharge switch 230 by means of the connection line 201, whereby a discharge current of the capacitor 300 flows through the exciter coil 100 with high current intensity. The rapidly increasing discharge current induces a field magnetic field, which passes through the squirrel-cage rotor 90 and induces in its squirrel-cage rotor 90, in turn, an annular secondary electric current. This secondary current that builds up in turn generates a secondary magnetic field which is opposite to the excitation magnetic field, whereby the squirrel cage rotor 90 experiences a Lorentz force repelling the exciting coil 100, which drives the driving element 60 onto the receptacle 20 and the fastening element 30 received therein. As soon as the piston rod 80 of the driving element 60 strikes an unspecified head of the fastening element 30, the fastening element 30 is driven by the driving element 60 into the ground. Excessive kinetic energy of the driving element 60 is absorbed by a braking element 85 made of a resilient and / or damping material, for example rubber, by the driving element 60 with the piston plate 70 against the Brake element 85 is moved and braked by this to a standstill. Thereafter, the driving-in element 60 is returned to the setting position by an unspecified return device.

The capacitor 300, in particular its center of gravity, is arranged on the setting axis A behind the driving element 60, whereas the receptacle 20 is arranged in front of the driving element 60. With regard to the setting axis A, the capacitor 300 is thus arranged axially offset from the driving-in element 60 and radially overlapping with the driving-in element 60. As a result, on the one hand, a short length of the discharge lines 210, 220 can be realized, as a result of which the resistances thereof can be reduced and thus an efficiency of the drive can be increased. On the other hand, a small distance of a center of gravity of the setting device 10 to the setting axis A can be realized. As a result, tilting moments during a recoil of the setting device 10 during a driving operation are low. In an embodiment, not shown, the capacitor is arranged around the driving element around.

The electrodes 310, 320 are arranged on opposite sides on a carrier film 330 wound around a winding axis, for example by metallization of the carrier film 330, in particular vapor-deposited, the winding axis coinciding with the setting axis A. In embodiments not shown, the carrier foil with the electrodes is wound around the winding axis so that a passage remains along the winding axis. In particular, in this case, the capacitor is arranged for example around the setting axis. The carrier foil 330 has a foil thickness of between 2.5 μm and 4.8 μm for a charging voltage of the capacitor 300 of 1500 V, and a foil thickness of, for example, 9.6 μm for a charging voltage of the capacitor 300 of 3000 V. In embodiments not shown, the carrier film is in turn composed of two or more individual films stacked on top of each other. The electrodes 310, 320 have a sheet resistance of 50 ohm / □.

A surface of the capacitor 300 has the shape of a cylinder, in particular a circular cylinder whose cylinder axis coincides with the setting axis A. A height of this cylinder in the direction of the winding axis is substantially as large as its diameter measured perpendicular to the winding axis. By a low ratio of height to diameter of the cylinder, a low internal resistance at a relatively high capacitance of the capacitor 300 and not least a compact design of the setting device 10 are achieved. A low internal resistance of the capacitor 300 is also achieved by a large cross-section of the electrodes 310, 320, in particular by a high layer thickness of the electrodes 310, 320, wherein the effects of the layer thickness on a Self-healing effect and / or a lifetime of the capacitor 300 are taken into account.

The capacitor 300 is damped by means of a damping element 350 mounted on the other setting tool 10. The damping element 350 damps movements of the capacitor 300 relative to the rest of the setting device 10 along the setting axis A. The damping element 350 is arranged on the end face 360 of the capacitor 300 and covers the end face 360 completely. As a result, the individual windings of the carrier film 330 are uniformly loaded by a recoil of the setting device 10. The electrical contacts 370, 380 protrude from the end face 360 and penetrate the damping element 350. The damping element 350 has for this purpose in each case an exemption, through which the electrical contacts 370, 380 protrude. The connecting lines 301 have to compensate for relative movements between the capacitor 300 and the other setting tool 10 each have a discharge and / or expansion loop, not shown. In non-illustrated embodiments, a further damping element is arranged on the capacitor, for example on its end facing away from the receptacle end face. Preferably, the capacitor is then clamped between two damping elements, that is, the damping elements are applied to the capacitor with a bias voltage. In further embodiments, not shown, the connecting lines have a rigidity which decreases continuously with increasing distance from the capacitor.

In Fig. 2 is an electrical circuit diagram 400 of a not shown setting device for driving fasteners in a substrate, not shown. The setting device has a housing, not shown, a handle, not shown, with an actuating element, a receptacle, not shown, a magazine, not shown, a not shown driving-in element and a drive for the driving element on. The drive comprises a not shown, arranged on the driving element squirrel cage, an exciter coil 410, a soft magnetic frame, not shown, a circuit 420, a capacitor 430, an accumulator designed as an electric energy storage 440 and a control unit 450 with a DC as DC, for example The switching converter 451 has a low-voltage side U _LV electrically connected to the electrical energy store 440 and a high-voltage side U _HV electrically connected to the capacitor 430.

The circuit 420 is intended to cause a rapid electrical discharge of the previously charged capacitor 430 and the thereby flowing discharge current through the exciter coil 410. The circuit 420 comprises for this purpose two discharge lines 421, 422 which connect the capacitor 430 to the excitation coil 420 and of which at least one discharge line 421 is interrupted by a normally open discharge switch 423. A freewheeling diode 424 inhibits excessive oscillation of a resonant circuit formed by the switching circuit 420 with the exciter coil 410 and the capacitor 430, as well as negative charging of the capacitor 430.

When the setting tool is pressed against the ground, the control unit 450 initiates a capacitor charging process in which electrical energy is conducted from the electrical energy storage 440 to the switching converter 451 of the control unit 450 and from the switching converter 451 to the capacitor 430, around the capacitor 430 charge. The switching converter 451 converts the electric current from the electrical energy store 440 at an electrical voltage of, for example, 22 V into a suitable charging current for the capacitor 430 at an electrical voltage of 1500 V, for example.

Triggered by an actuation of the actuator, not shown, the control unit 450 initiates a capacitor discharge, in which electrical energy stored in the capacitor 430 is conducted by the circuit 420 from the capacitor 430 to the field coil 410 by discharging the capacitor 430. To initiate the capacitor discharge process, the control unit 450 closes the discharge switch 423 by means of a control line, not shown, whereby a discharge current of the capacitor 430 flows with high current through the exciting coil 410. As a result, the squirrel-cage rotor, not shown, experiences a Lorentz force repelling the excitation coil 410, which drives the drive-in element. Thereafter, the driving element is returned by a return device, not shown, in a set ready position.

An amount of energy of the current flowing through the excitation coil 410 during rapid discharge of the capacitor 430 is controlled in particular steplessly by the control unit 450 by setting a charging voltage (U _HV ) applied to the capacitor 430 during and / or at the end of the capacitor charging process and before the rapid discharge becomes. A stored in the charged capacitor 430 electrical energy and thus the amount of energy flowing through the exciter coil 410 in the rapid discharge of the capacitor 430 current are proportional to the charging voltage and thus controllable by means of the charging voltage. The capacitor is charged during the capacitor charging process until the charging voltage U _HV has reached a desired value.

Then the charging current is switched off. If the charging voltage before fast discharge decreases, for example, by parasitic effects, the charging current is switched on again until the charging voltage U _{HV has reached} the target value again.

The control unit 450 controls the amount of energy of the current flowing through the excitation coil 410 in the rapid discharge of the capacitor 430 as a function of a plurality of control variables. For this purpose, the setting device comprises a means configured as a temperature sensor 460 means for detecting a temperature of the exciting coil 410 and a means for detecting a capacitance of the capacitor, which is designed for example as a calculation program 470 and the capacitance of the capacitor of a course of a current and an electrical voltage the charging current during the charging of the capacitor. Furthermore, the setting tool comprises a means configured as an acceleration sensor 480 for detecting a mechanical load variable of the setting device. Furthermore, the setting device comprises a means for detecting a Eintreibtiefe of the fastener in the ground, which includes an example, optical, capacitive or inductive proximity sensor 490, which comprises a reversing position of the drive element, not shown. Furthermore, the setting device comprises a means for detecting a speed of the driving element, which comprises a first proximity sensor 500 formed means for detecting a first time at which the driving member passes during its movement on the fastener to a first position, formed as a second approach sensor 510 means for detecting a second time at which the driving element passes to a second position during its movement on the fastener, and a means configured as a calculation program 520 for detecting a time difference between the first time and the second time. Furthermore, the setting device comprises a user-adjustable control element 530 and a barcode reader 540 designed as means for detecting a characteristic of a fastener element to be driven.

The control variables, in dependence of which the control unit 450 controls the energy amount of the current flowing through the excitation coil 410 during the rapid discharge of the capacitor 430, include the temperature detected by the temperature sensor 460 and / or the capacity of the capacitor calculated by the calculation program 470 and / or the loading device of the setting device detected by the acceleration sensor 480 and / or the driving depth of the fastening element detected by the approach sensor 490 and / or the speed of the driving element calculated by the calculation program 520 and / or the setting of the operating element 530 set by the user and / or the characteristic quantity of the fastening element detected by the bar code reader 540.

Incidentally, the structure and operation of the setting device are substantially the same as in Fig. 1 shown setting device 10 match.

In Fig. 3 is another electrical circuit diagram 600 of a setting device not shown further for driving fasteners into a substrate, not shown. The setting tool has a drive-in element and a drive for the drive-in element. The drive comprises a not shown, arranged on the driving element squirrel cage, an exciter coil 610, a soft magnetic frame, not shown, a circuit 620 with a discharge switch 623 and a freewheeling diode 624, a capacitor 630, an electrical energy storage, not shown, and a control unit 650 with a The switching converter 651 has a low voltage side 652 electrically connected to the electrical energy store and a high voltage side 653 electrically connected to the capacitor 630 with a plurality of, for example, four rectifier diodes 654.

The control unit 650 is operable in a normal operation and in a backup operation. When the setting tool is pressed against the ground while the control unit 650 is operated in the normal operation, the control unit 650 initiates a capacitor charging operation in which electric power is supplied from the electric energy storage to the switching converter 651 of the control unit 650 and the switching converter 651 the capacitor 630 is passed to charge the capacitor 630. In order to accelerate the drive element to a fastener, the control unit 650 initiates a capacitor fast discharge process in which the electrical energy stored in the capacitor 630 is conducted by the circuit 620 from the capacitor 630 to the field coil 610 by discharging the capacitor 630 becomes. To initiate the capacitor discharge process, the control unit 650 closes the discharge switch 623 by means of a control line, not shown.

When the control unit 650 transitions to the fuse mode, the control unit 650 initiates a fuse discharge of the capacitor 630 in which the exciter coil 610 is not energized, so that no fastener is ejected from the setting tool. For this purpose, the control unit 650, in particular the switching converter 651, a designed as a resistor network resistor 655 and a with the resistor 655 connected in series fuse switch 656. The resistor 655 and the fuse switch 656 form a fuse circuit with the capacitor 630. To initiate the fuse discharge, the control unit 650 closes the fuse switch 656 by means of a control line, not shown. As a result, the fuse circuit is closed, so that a fuse discharge current from the capacitor 630 flows through the resistor 655. The electrical energy stored in the charged capacitor is then dissipated in resistor 655, heating resistor 655.

The control unit 650 changes to the backup mode depending on a plurality of state parameters. For this purpose, the setting device comprises a means configured as a temperature sensor 660 means for detecting a temperature of the exciting coil 610 and a means for detecting a charging voltage of the capacitor 630, which is formed for example as a voltmeter 670. Furthermore, the setting device comprises a means configured as an acceleration sensor 680 for detecting a mechanical load variable of the setting device. Furthermore, the setting device, in particular the control unit 650, comprises means for detecting a duration during which the capacitor 630 is already electrically charged, wherein the means for detecting the duration is designed as a calculation program 690. Furthermore, the setting device comprises a contact sensor 695 formed as a means for detecting a removal of a housing part or the electric battery of the setting device. This is detected, for example, when the housing of the setting device is opened. In embodiments not shown, a means for detecting a removal of the electric battery is designed as a voltmeter, which measures an electrical voltage of the battery. As soon as the measured voltage drops to 0 V, this is detected as removal of the battery.

The state parameters in dependence of which the control unit 650 transitions into the fuse operation include the temperature detected by the temperature sensor 660 and / or the charge voltage of the capacitor 630 detected by the voltmeter 670 and / or the load size of the setting device detected by the acceleration sensor 680 and / or the duration calculated by the calculation program 690 during which the capacitor 630 is already electrically charged and / or a removal of a housing part or the battery detected by the contact sensor 695. The control unit 650 is intended, for example, to enter the fuse mode when the temperature measured by the temperature sensor 660 exceeds a predetermined maximum temperature and / or the charging voltage of the capacitor 660 detected by the voltmeter 670 exceeds a predetermined value Exceeds limit voltage and / or the acceleration detected by the acceleration sensor 680 exceeds a predetermined maximum acceleration value and / or calculated by the calculation program 690 duration during which the capacitor 630 is already electrically charged, exceeds a predetermined maximum duration and / or removal of a housing part or Battery is detected by the contact sensor 695.

Incidentally, the structure and operation of the setting device are substantially the same as in Fig. 1 and or Fig. 2 shown setting device.

In Fig. 4 is another electrical circuit diagram 700 of a setting device not shown further for driving fasteners into a substrate, not shown. The setting tool has a drive-in element and a drive for the drive-in element. The drive comprises an excitation coil 710, a circuit 720 with a discharge switch 723 and a freewheeling diode 724, a capacitor 730, a control unit 750 with a switching converter 751. The switching converter 751 has a low-voltage side 752 and a high-voltage side 753 with a plurality of, for example, four rectifier switches 754, a resistor 755, a circuit breaker 756, and a charging switch 757. In order to rectify the charging current for the capacitor 730, the control unit 750 opens and closes the rectifier switches 754 in pairs crosswise when the charging switch 757 is closed. As soon as the capacitor 730 is charged, the control unit 750 opens the charging switch 757 so that the capacitor does not discharge via the switching converter 751.

Incidentally, the structure and operation of the setting device are substantially the same as in Fig. 1 and or Fig. 2 and or Fig. 3 shown setting device.

In Fig. 5 is another electrical circuit diagram 800 of a setting device not shown further for driving fasteners in a substrate, not shown. The setting tool has a drive-in element and a drive for the drive-in element. The drive comprises an excitation coil 810, a circuit 820 with a discharge switch 823 and a freewheeling diode 824, a capacitor 830, a control unit 850 with a switching converter 851. The switching converter 851 has a low-voltage side 852 and a high-voltage side 853 with four rectifier switches 854, a resistor 855 and a charging switch 857.

When the controller 850 enters fuse mode, the controller 850 initiates a fuse discharge of the capacitor 830, in which the controller 850 preferably at least two of the rectifier switches 854 connected in series Rectifier switch 854, closes by means not shown control lines. Thereby, a fuse circuit formed by the capacitor 830, the resistor 855, and the rectifier switches 854 is closed, so that a fuse discharge current from the capacitor 830 flows through the resistor 855. The rectifier switches 854 thus form a safety switch. The charging switch 857 connected in parallel with the resistor 855 remains open. The electrical energy stored in the charged capacitor is then dissipated in resistor 855.

Incidentally, the structure and operation of the setting device are substantially the same as in Fig. 1 and or Fig. 2 and or Fig. 3 and or Fig. 4 shown setting device.

In Fig. 6 is another electrical circuit diagram 900 of a not shown setting device for driving fasteners in a substrate, not shown. The setting tool has a drive-in element and a drive for the drive-in element. The drive comprises an excitation coil 910, a circuit 920 with a discharge switch 923 and a freewheeling diode 924, a capacitor 930, a control unit 950 with a switching converter 951. The switching converter 951 has a low-voltage side 952 and a high-voltage side 953 with four rectifier switches 954 and a charging switch 957 on.

When the control unit 950 enters fuse mode, the control unit 950 initiates a fuse discharge of the capacitor 930, in which the control unit 950 closes the rectifier switches 954 and the charge switch 957 by means of control lines (not shown). Thereby, a fuse circuit formed by the capacitor 930, the charging switch 957, and the rectifier switches 954 is closed, so that a fuse discharge current flows out of the capacitor 930 through the charging switch 957 and the rectifier switches 954. The charging switch 957 thus forms a safety switch. In a first embodiment, all rectifier switches 954 are closed simultaneously. The electrical energy stored in the charged capacitor 930 is then dissipated in the rectifier switches 954 and the charging switch 957. A duration of the discharge process is preferably adjustable by appropriate control of the rectifier switch 954 by the control unit 950. In another embodiment, the rectifier switches 954 are alternately cross-connected in pairs so that the fuse discharge current from the switching converter 951 is converted into a battery charging current on the low voltage side 952. A connected to the low voltage side 952 electric battery is then traversed by current and charged. The stored in the charged capacitor 930 electrical energy is thus stored in the battery and can be reused in a further operation of the setting device. The switching converter 951 is designed for this purpose as a bidirectional switching converter.

Incidentally, the structure and operation of the setting device are substantially the same as in Fig. 1 and or Fig. 2 and or Fig. 3 and or Fig. 4 and or Fig. 5 shown setting device.

The invention has been described with reference to a number of illustrated in the drawings and not shown embodiments. The individual features of the various embodiments are individually or in any combination applicable to each other, unless they contradict each other. It should be noted that the setting tool according to the invention can also be used for other applications.

Claims (15)

Setting device for driving fasteners into a ground, in particular hand-held setting tool, comprising a receptacle which is intended to receive a fastener, a driving element, which is intended to convey a recorded in the receiving fastener along a setting axis in the ground, a Drive, which is intended to drive the driving element along the setting axis on the fastening element, wherein the drive comprises an electrical capacitor, a arranged on the driving element squirrel cage and an excitation coil, which is flowed through at a fast discharge of the capacitor with current and generates a magnetic field which accelerates the driving element to the fastener, and wherein the setting device comprises a control unit which is adapted to perform a fuse discharge of the capacitor, wherein the exciting coil not with Current is flowing through. Setting device according to claim 1, wherein the control unit is operable in a normal operation and in a backup operation, and wherein the control unit is adapted to carry out a fast discharge in the normal operation and perform the backup discharge in the backup operation. Setting tool according to one of the preceding claims, wherein the drive comprises a circuit comprising a discharge switch, wherein the control unit is adapted to close in normal operation, the discharge switch to bring about the rapid discharge, and wherein the control unit comprises a fuse switch and is suitable to close the fuse switch in the fuse mode to effect the fuse discharge. Setting device according to one of claims 2 to 3, wherein the setting device comprises a detection means for detecting a state parameter of the setting device, and wherein the control unit is arranged to change depending on the detected state parameter in the backup mode. Setting tool according to claim 4, wherein the setting device, in particular the control unit, means for detecting a duration during which the capacitor is already electrically charged, and wherein the detected state parameter comprises the detected duration. Setting tool according to one of claims 4 to 5, wherein the setting device comprises a means for detecting a mechanical load variable, in particular an acceleration of the setting device, and wherein the detected state parameter comprises the detected load variable, in particular an acceleration, of the setting device. The setting tool according to any one of claims 4 to 6, wherein the setting device comprises means for detecting a charging voltage of the capacitor, and wherein the detected state parameter comprises the charging voltage of the capacitor. Setting tool according to claim 7, wherein the control unit is provided for switching to the fuse operation when the charging voltage of the capacitor exceeds a predetermined limit voltage. Setting tool according to one of claims 4 to 8, wherein the setting device comprises means for detecting a temperature of an environment and / or the setting device, in particular the excitation coil, wherein the detected state parameter comprises the detected temperature. Setting tool according to one of claims 4 to 9, wherein the setting device comprises means for detecting a removal of a component of the setting device, in particular a housing part or an electric battery, wherein the detected state parameter is the absence of the component of the setting device. Setting tool according to one of the preceding claims, wherein the control unit has an electrical resistance, which is flowed through during the fuse discharge of the capacitor with current. The setting tool of claim 11, wherein the electrical resistance comprises a resistor network. Setting tool according to one of the preceding claims, wherein the setting device comprises an electric battery, which is flowed through during the fuse discharge of the capacitor with current and charged. The setting device according to claim 13, wherein the control unit comprises a bidirectional switching converter, which converts a battery current into a capacitor charging current for charging the capacitor and for a fuse discharge of the Capacitor converts a discharge current of the capacitor into a battery charging current. The setting tool of claim 14, wherein the bidirectional switching converter comprises one or more rectifier switches which are closed to effect the fuse discharge.

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