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AssigneeGustav Klauke GmbH
InventorEgbert Frenken
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The invention relates to a method for operating a motor-driven hand-held pressing apparatus. In said method, once a switch has been actuated, one or more pressing jaws is/are moved from a starting position into a closed pressing position until a predefined pressing force has been reached or a given amount of time has lapsed, whereupon the pressing jaw/s is/are automatically released, e.g. using the return travel of a plunger. The releasing action can be interrupted in an intermediate position, before reaching the starting position, so as to start a subsequent pressing process from such an intermediate position. In order to be able to reach the advantage of the intermediate position without having to intervene when similar processes are carried out, a measure of the travel and/or the time and/or the pressure determined during the pressing process and associated with the intermediate position is detected or stored in order to be able to automatically interrupt the releasing action in the respective intermediate position on the basis of said measure during subsequent pressing processes.
Method for operating a motor-actuated handheld pressing unit in which, in response to the actuation of a switch, one or more pressing jaws are moved from a starting position into a closed pressing position until a prescribed pressing force has been reached or a prescribed amount of time has elapsed, after which the pressing jaws are released automatically, for instance by the return of a pressing piston, but it being possible for this release to be interrupted in an intermediate position before reaching the starting position, in order to begin a next pressing operation from such an intermediate position, characterized in that, in relation to an interruption, a measurement of travel and/or time and/or pressure determined during the pressing operation and associated with the intermediate position is detected and stored in order to be able to automatically interrupt, during subsequent pressing operations, the releasing action in the intermediate position in question, as a result of said measurement.
Method for operating a motor-actuated handheld pressing unit in which, in response to the actuation of a switch, one or more pressing jaws are moved from a starting position into a closed pressing position until a prescribed pressing force has been reached or a prescribed amount of time has elapsed, after which the pressing jaws are released automatically, for instance by the return of a pressing piston, the pressing piston furthermore being actuated hydraulically by means of a hydraulic medium, characterized in that the reaching of the prescribed pressing force is checked by means of a pressure sensor detecting the pressure of the hydraulic medium.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the workpiece contact is determined by an evaluation of the motor current.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the time from workpiece contact to completion of the pressing operation is measured and the release of the pressing jaws is interrupted after the elapse of a travel distance since the completion of the pressing operation that corresponds to the time measured.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that, in dependence on specific actuation of the unit, the return is carried out in following pressing operations in each case only up to the intermediate position.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the measurement of travel and/or time is recorded as a result of a freely selected interruption.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the measurement of travel and/or time is recorded as a result of a change in the actuating cycle.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the checking that the prescribed pressing force has been achieved is carried out by comparison between a prescribed minimum pressure value and a pressure value actually achieved.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that the carrying-out of the pressing operation is monitored with regard to different pressure gradients by means of the pressure detection.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that a transition to a steeper rise in pressure, detected after workpiece contact and related pressing has taken place, is evaluated as a signal for a completed pressing operation.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that a desired automatic opening of the return valve is checked by means of the pressure detection.
Method according to one or more of the preceding claims or in particular according thereto, characterized in that stopping of the moving part to achieve maintenance of pressure is carried out by means of prescribing a threshold pressure value that lies below a maximum pressure value to be achieved for the ending of a pressing cycle.
Motor-actuated handheld pressing unit, with a fixed part and a moving part, the moving part being moved in relation to the fixed part by a hydraulic piston that runs in a hydraulic cylinder and is movable back into a starting position by means of a return spring, characterized in that a pressure sensor which detects the pressure of the hydraulic medium in the hydraulic cylinder is provided.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that a determination of the piston position is carried out by means of the pressure sensor.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that an electrical line transmitting the signal of the pressure sensor to a microcontroller is branched and in that one branch line is connected unfiltered to an ADC channel of the microcontroller, while the other branch line is provided with a boosting unit and/or a lowpass filter.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that a pressure prevailing in the hydraulic medium when a pressing operation is switched on is measured and compared with a desired value.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that, in dependence on the pressure of the hydraulic medium determined during the switching-on, an opening of the return valve is carried out in association with this switching-on.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that the pressure is measured at a time interval of less than one second.
Handheld pressing unit according to one or more of the preceding claims or in particular according thereto, characterized in that the pressure is measured at a time interval that lies between one and twenty milliseconds.
Dependencies are inferred from the claim text.