DEVICE, DRIVETAINER AND METHOD

Description

Technical area

[0001] The application relates to a device and a method for controlling a recurring movement sequence of a control element as well as to a driving tool and a method for controlling a setting tool for driving a fastening element into a substrate. State of the art

[0002] With such devices, it is possible for certain positions of the control element to shift over time. To ensure that the control element reaches all important positions during the recurring movement sequence, even after extended periods of time, relatively long paths are provided for the control element. It is desirable to provide a device and method in which these paths can be reduced.

[0003] US 2015 / 0158160 A1 discloses an electropneumatic tool device in which an electric motor drives a first piston to compress air in a first cylinder. The compressed air is then fed to a second cylinder to drive a second piston. The first piston is decelerated after passing a top dead center. If the first piston does not stop sufficiently close to a bottom dead center after deceleration, one or more parameters of the deceleration process can be modified during a subsequent driving process.

[0004] EP 2 604 389 A2 discloses a driving device comprising a spindle drive, a force deflector, and a driving element. The force deflector is designed to transfer force from the spindle drive to the driving element. Description of the invention

[0005] The problem is solved by a driving tool according to claim 1.

[0006] A further advantageous embodiment is characterized in that the energy transmission device comprises the control element, wherein the control element is moved into the stop position in order to store potential energy in the potential energy storage device.

[0007] A further advantageous embodiment is characterized in that the energy transmission device comprises a motor for driving the control element, wherein the at least one control parameter comprises an electrical voltage, a current intensity, a rotational speed and / or a switch-off time of the motor during the recurring movement sequence.

[0008] A further advantageous embodiment is characterized in that the energy transmission device comprises a spindle drive, preferably driven by the motor, with a threaded spindle and a spindle nut, wherein the control element comprises the threaded spindle or the spindle nut.

[0009] The object is also achieved by a method according to claim 6.

[0010] A further advantageous embodiment is characterized in that the energy transmission device comprises the control element, wherein the control element is moved into the stop position in order to store potential energy in the potential energy storage device.

[0011] A further advantageous embodiment is characterized in that the energy transmission device comprises a motor for driving the control element, wherein the at least one control parameter comprises an electrical voltage, a current intensity, a rotational speed and / or a switch-off time of the motor during the recurring movement sequence. Examples of implementation

[0012] Embodiments of a device for driving a fastener into a substrate are explained in more detail below using examples with reference to the drawings. They show: Fig. 1 a side view of a driving device, Fig. 2 a side view of the driving device with the housing open, Fig. 3 a longitudinal section of the driving device, Fig. 4 a longitudinal section of the driving device, Fig. 5 a longitudinal section of the driving device and Fig. 6 a longitudinal section of a coupling device with a coupled piston.

[0013] Fig. 1shows a side view of a driving device 10 for driving a fastening element, for example a nail or bolt, into a substrate. The driving device 10 has a power transmission element (not shown) for transmitting power to the fastening element, as well as a housing 20 in which the power transmission element and a drive device (also not shown) for conveying the power transmission element are accommodated.

[0014] The driving device 10 further comprises a handle 30, a magazine 40, and a bridge 50 connecting the handle 30 to the magazine 40. A scaffold hook 60 for suspending the driving device 10 from a scaffold or the like, and an electrical energy storage device embodied as an electric battery 590 are attached to the bridge 50. A trigger 34 and a handle sensor embodied as a manual switch 35 are arranged on the handle 30. Furthermore, the driving device 10 comprises a guide channel 700 for guiding the fastening element and a pressing device 750 for detecting a distance of the driving device 10 from a substrate (not shown). Aligning the driving device perpendicular to a substrate is assisted by an alignment aid 45.

[0015] Fig. 2shows the driving device 10 with the housing 20 open. A drive device 70 for conveying an energy transmission element (not shown in the drawing) is accommodated in the housing 20. The drive device 70 comprises an electric motor (not shown) for converting electrical energy from the battery 590 into rotational energy, a torque transmission device comprising a gear 400 for transmitting a torque from the electric motor to a motion converter embodied as a spindle drive 300, a force transmission device comprising a roller train 260 for transmitting a force from the motion converter to a mechanical energy storage device embodied as a spring 200, and for transmitting a force from the spring 200 to the energy transmission element.

[0016] Fig. 3shows a longitudinal section of the driving device 10 after a fastening element has been driven forward, i.e. to the left in the drawing, into a substrate with the aid of the energy transmission element designed as a piston 100. The piston is in its setting position. The front spring element 210 and the rear spring element 220 are in the relaxed state in which they actually still have a certain residual tension. The front roller holder 281 is in its forwardmost position during operation and the rear roller holder 282 is in its rearmost position during operation. The spindle nut 320 is located at the front end of the spindle 310. Because the spring elements 210, 220 may be relaxed to a residual tension, the belt 270 is essentially load-free.

[0017] As soon as the control device 500 detects via a sensor that the piston 100 is in its set position, the control device 500 initiates a return process in which the piston 100 is moved to its starting position. For this purpose, a motor rotates the spindle 310 in a first direction via the gear 400, so that the anti-rotation spindle nut 320 is moved backward.

[0018] The return rods 199 engage with a return pin of the piston 100 and thus also move the piston 100 backward. The piston 100 carries the belt 270 with it, but the spring elements 210, 220 are not tensioned, since the spindle nut 320 also carries the belt 270 backward, releasing the same amount of belt length via the rear rollers 292 as the piston retracts between the front rollers 291. The belt 270 therefore remains essentially load-free during the return process.

[0019] Fig. 4shows a longitudinal section of the driving device 10 after the retrieval process. The piston 100 is in its initial position and is coupled with its coupling plug 110 in the coupling device 150. The front spring element 210 and the rear spring element 220 remain in their respective relaxed states, the front roller holder 281 is in its forwardmost position, and the rear roller holder 282 is in its rearmost position. The spindle nut 320 is located at the rear end of the spindle 310. Due to the relaxed spring elements 210, 220, the belt 270 remains essentially load-free.

[0020] If the driving device is now lifted from the ground so that the pressing device 750 is moved forward relative to the guide channel 700, the control device 500 initiates a tensioning process in which the spring elements 210, 220 are tensioned. For this purpose, the motor rotates the spindle 310 via the gear 400 in a second direction of rotation opposite to the first direction of rotation, so that the rotation-locked spindle nut 320 is moved forward. The coupling device 150 holds the coupling plug-in part 110 of the piston 100 so that the length of tape pulled in by the spindle nut 320 between the rear rollers 292 cannot be released by the piston. The roller holders 281, 282 are therefore moved toward one another and the spring elements 210, 220 are tensioned.

[0021] Fig. 5shows a longitudinal section of the driving device 10 after the tensioning process. The piston 100 remains in its initial position and is coupled with its coupling plug 110 in the coupling device 150. The front spring element 210 and the rear spring element 220 are tensioned, the front roller holder 281 is in its rearmost position, and the rear roller holder 282 is in its frontmost position. The spindle nut 320 is located at the front end of the spindle 310.

[0022] The band 270 deflects the tensioning force of the spring elements 210, 220 on the rollers 291, 292 and transfers the tensioning force to the piston 100, which is held against a holding force by the coupling device 150.

[0023] The driving device 10 is now ready for a driving operation. As soon as a user pulls the trigger 34, the coupling device 150 releases the piston 100, which then transfers the tensioning energy of the spring elements 210, 220 to a fastener and drives the fastener into the substrate.

[0024] Fig. 6shows a longitudinal section of the coupling device 150 with the piston 100 engaged. For this purpose, the piston 100 has a coupling plug-in part 110 with coupling recesses into which several locking elements 160 of the coupling device 150 can engage. Furthermore, the piston 100 has an actuating element designed as a shoulder 125 as well as a band feedthrough 130 and a convex-conical section 135. The locking elements, designed in particular as balls 160, and / or the inner sleeve 170 are preferably made of hardened steel. The parts of the coupling device that move relative to one another, in particular the locking elements and / or the inner sleeve, are preferably provided with a sliding or lubricating agent. In embodiments not shown, the locking elements and / or the inner sleeve are made of ceramic.

[0025] The piston 100 comprises a shaft 140 and a head 142, wherein the shaft 140 and the head 142 are preferably soldered together. A positive fit in the form of a shoulder 144 prevents the shaft 140 from slipping out of the head 142 in the event of a break in the soldered connection 146. In one embodiment not shown, the piston is formed in one piece.

[0026] Coupling of the piston 100 into the coupling device 150 begins in an unlocked state of the coupling device 150, in which the outer sleeve 180, acted upon by the return spring 190, allows the balls 160 to be received in the recesses 182. The piston 100 can therefore displace the balls 160 outward upon insertion of the piston 100 into the inner sleeve 170. With the aid of the shoulder 125, the piston 100 then displaces the outer sleeve 180 against the force of the return spring 190 and closes the coupling device 150. As soon as the pawl 800 engages the coupling pin 195, the coupling device 150 is held in the locked state. In an embodiment not shown, one or more driving elements of an energy transmission device each have an actuating element which displaces the outer sleeve when the piston is retracted into the coupling device.The driving elements serve to move the piston towards the clutch device so that the driving elements are moved along with the piston.

[0027] As described above, the piston is coupled into the coupling device by the spindle nut 320 with the aid of the return rods 199. How far the piston 100 is retracted into the coupling device 150 depends on a stop position of the spindle nut 320. Since the stop position of the spindle nut 320 can shift over time, for example due to temperature fluctuations and / or wear, there is a risk that the piston 100 will not always be securely coupled into the coupling device 150. To counteract this risk, the piston 100 is retracted so far into the coupling device that it travels an additional distance after engagement. Sufficient space must be provided within the coupling device 150 for this additional distance. In order to be able to select the aforementioned additional distance of the piston 100 as short as possible, the recurring return process is controlled using a method described below.

[0028] The control device 500 controls the stopping of the spindle nut 320 forming a control element in the Fig. 4shown stop position by means of a control parameter, for example, an electrical voltage, a current, a speed and / or a switch-off time of the motor or the number of revolutions or commutations of the motor until the motor that drives the spindle 310 is switched off. In order to detect an actual stop position of the spindle nut 320 at the time of its stop, the driving device has a clutch sensor 198, which transmits a signal to the control device 500 as soon as the piston 100 is coupled in the clutch device 150 and / or the clutch device 150 is closed. The control device 500 then calculates a difference between the actual stop position and a desired stop position of the spindle nut 320, for example, by counting revolutions / commutations of the motor after receiving the signal transmitted by the clutch sensor 198 and stopping the motor or the spindle nut 320.If the resulting difference exceeds a predetermined target value, the control device 500 adjusts the control parameter for a subsequent retraction process. This makes it possible to use a small coupling device 150.

[0029] The invention has been explained using the example of a driving device for fasteners. However, it should be noted that the device and method according to the invention are also suitable for other applications.

Claims

1. Driving device for driving a fastening element into a base material, the driving device comprising a power unit (70) and a driving element (100), formed in particular as a piston, which is driven by the power unit (70) from a starting position into a setting position, in order to drive a fastening element into the base material, the driving device comprising an apparatus comprising a control element (320), which stops in a stopping position during a recurring sequence of movements, a control device (500), which is intended for controlling stopping of the control element (320) in the stopping position by means of at least one control parameter, characterized by a detection device (198) for detecting an actual stopping position of the control element (320) at the time of a stopping of the control element (320), the control device (500) being suitable for forming a difference between the actual stopping position and a desired stopping position of the control element (320) and adapting the control parameter for a subsequent sequence of movements of the control element (320) if the difference exceeds a predetermined desired value, the control element (320) returning the driving element (100) from the setting position into the starting position, characterized in that the driving device also comprises a clutch device (150) with an open state and a closed state, the clutch device (150) temporarily arresting the driving element (100) in the starting position in a closed state of the clutch device (150), and a detection device (198) for detecting a transition of the clutch device (150) from the open state into the closed state, the control unit (500) being configured for calculating a distance covered by the control element (320) between a transition of the clutch device (150) from the open state into the closed state and a stopping of the control element (320), in order to detect the actual stopping position of the control element (320).

2. Driving device according to Claim 1, the power unit (70) comprising a potential energy store (200), formed preferably as a spring, for storing potential energy by means of which the driving element (100) is driven, and an energy transmission device for transmitting energy from an energy source to the potential energy store (200).

3. Driving device according to Claim 2, the energy transmission device comprising the control element (320), and the control element (320) being moved into the stopping position in order to store potential energy in the potential energy store (200).

4. Driving device according to either of Claims 2 and 3, the energy transmission device comprising a motor for driving the control element (320), and the at least one control parameter comprising an electrical voltage, a current intensity, a rotational speed and / or a switching-off time of the motor during the recurring sequence of movements.

5. Driving device according to one of Claims 2 to 4, the energy transmission device comprising a spindle drive (300), which is in particular driven by the motor and has a threaded spindle (310) and a spindle nut (320), the control element (320) comprising the threaded spindle (310) or the spindle nut (320).

6. Method for controlling a setting device for driving a fastening element into a base material, comprising a power unit (70) and a driving element (100), formed in particular as a piston, which is driven by the power unit (70) from a starting position into a setting position, in order to drive a fastening element into the base material, the setting device comprising a control element (320), which returns the driving element (100) from the setting position into the starting position during a recurring sequence of movements, the driving device also having a clutch device (150) with an open state and a closed state, the clutch device (150) temporarily arresting the driving element (100) in the starting position in a closed state of the clutch device (150), and the recurring sequence of movements of the control element (320) being controlled by a method for controlling a recurring sequence of movements of a control element (320), which stops in a stopping position during the recurring sequence of movements, the method comprising the following steps: - controlling a stopping of the control element (320) in the stopping position by means of at least one control parameter, - characterized by the following steps: - detecting an actual stopping position of the control element (320) at the time of a stopping of the control element (320), - forming a difference between the actual stopping position and a desired stopping position of the control element (320), - adapting the at least one control parameter for a subsequent sequence of movements of the control element (320) if the difference exceeds a predetermined desired value, the actual stopping position of the control element (320) being detected by a distance covered by the control element (320) between a transition of the clutch device (150) from the open state into the closed state and a stopping of the control element (320) being calculated.

7. Method according to Claim 6, the setting device comprising a potential energy store (200), formed in particular as a spring, for storing potential energy by means of which the driving element (100) is driven, and an energy transmission device for transmitting energy from an energy source to the potential energy store (200).

8. Method according to Claim 7, the energy transmission device comprising the control element (320), and the control element (320) being moved into the stopping position in order to store potential energy in the potential energy store (200).

9. Method according to either of Claims 7 and 8, the energy transmission device comprising a motor for driving the control element (320), and the at least one control parameter comprising an electrical voltage, a current intensity, a rotational speed and / or a switching-off time of the motor during the recurring sequence of movements.