Abstract: In a device for driving an instrument (2), for example an axle, step-by-step, the device includes a driving part (1), a space (3) between the driving part and the instrument (2), and at least one ball/roller (4) which can have different positions (A, B, C) in the space. In the different positions, the ball/roller is clamped between the driving part and the instrument or is not clamped, depending on the design of the space and/or the direction of the driving part. A guiding means can be arranged in order to force the ball/roller to different positions.

Abstract: A method and apparatus for operating a positioning device for an adjustable device. The positioning device is mechanically actuated by a bearing connected to a pivotable armature that interacts magnetically with an electromagnet. The electromagnet is energized by current pulses generated by a computer program. The current pulses cause the air gap between the pivotable armature and the electromagnet to vary between open positions where the electromagnet is not magnetized, and a closed position where the electromagnet is magnetized. Several bearings and associated electromagnets may be arranged to operate the positioning device in one or more directions and at different torques and operating speeds for different directions of operation and different positions of adjustment.

Abstract: The diaphragm pump includes a housing having an opening defined at one end. A diaphragm is attached to the housing and extends over the opening. An inlet is defined in the housing for receiving a fluid and a driving element is attached to the housing and in driving engagement with the diaphragm to vibrate the diaphragm. An orifice is defined in the diaphragm to permit a discharge of the fluid therethrough when the diaphragm is in vibration. A spring is disposed within the housing for biasing a plunger towards the diaphragm so that the plunger sealingly engages the diaphragm.