Abstract: The invention relates to a cooling apparatus for an electric component such as a CPU, a memory or power semiconductor, such as transistors or LEDs, or a processor. The cooling apparatus comprises a heatsink, an impeller that coaxially encloses the heatsink, and a drive motor for the impeller. The heatsink takes the form of a stationary hub having a base for introducing heat from the electronic component that is to be cooled, the hub widening towards the base. Cooling fins are thermally coupled to the hub, the cooling fins being given a spiral-like curve similar to the blades of the impeller. Due to the special design of the hub and the cooling fins as well as the use of a radial flux motor, a highly efficient, particularly compact cooling apparatus can be realized.

Abstract: The invention relates to a cooling apparatus for an electric component such as a CPU, a memory or power semiconductor, such as transistors or LEDs, or a processor. The cooling apparatus comprises a heatsink, an impeller that coaxially encloses the heatsink, and a drive motor for the impeller. The heatsink takes the form of a stationary hub having a base for introducing heat from the electronic component that is to be cooled, the hub widening towards the base. Cooling fins are thermally coupled to the hub, the cooling fins being given a spiral-like curve similar to the blades of the impeller. Due to the special design of the hub and the cooling fins as well as the use of a radial flux motor, a highly efficient, particularly compact cooling apparatus can be realized.

Abstract: The invention provides a device to generate an rpm-dependent signal, or a tachogenerator, having a plurality of magnet elements with alternating polarity which are arranged and distributed around the circumference of the rotor shaft. The magnet elements preferably take the form of a magnetic ring which has alternatively polarized sections and is held on a support attached to the rotor shaft. The tachogenerator of the present invention has at least one coil parallel to the axis which is arranged on a second supporting device at an axial distance to the magnet elements. The magnets and coils are arranged spatially relative to each other and can be rotated in relation to each other with the rotation of the rotor shaft in order to induce an rpm-dependent signal in the coils. In accordance with the invention, a signal displacement device is provided which superimposes a DC voltage on the signals induced in the coils in order to generate a voltage-displaced signal.

Abstract: A motor housing for an electric motor having a housing shell which encloses a space to accommodate the electric motor, and a flexible partition in the housing shell which separates a pressure equalizing cavity from the cavity accommodating the electric motor, whereby the pressure equalizing cavity is connected to the outside environment.

Abstract: The invention relates to a relay supporting unit for an electric motor to arrange a number of relays at the end of the electric motor, at which winding connections and signal lines of the electric motor are provided. The relays are used to connect and interrupt the power supply to the motor windings. The relay supporting unit according to the invention features a supporting component which is designed in such a way that it extends over the end of the electric motor and has at least one, preferably several, chambers to accommodate and position the relays. A connecting frame is integrated into the supporting component to electrically connect the winding connections and the relays. Furthermore, a sensor PCB is also preferably integrated to which the signal lines of the electric motor can be connected.

Abstract: The invention provides a device to generate an rpm-dependent signal, or a tachogenerator, having a plurality of magnet elements with alternating polarity which are arranged and distributed around the circumference of the rotor shaft. The magnet elements preferably take the form of a magnetic ring which has alternatively polarized sections and is held on a support attached to the rotor shaft. The tachogenerator of the present invention has at least one coil parallel to the axis which is arranged on a second supporting device at an axial distance to the magnet elements. The magnets and coils are arranged spatially relative to each other and can be rotated in relation to each other with the rotation of the rotor shaft in order to induce an rpm-dependent signal in the coils. In accordance with the invention, a signal displacement device is provided which superimposes a DC voltage on the signals induced in the coils in order to generate a voltage-displaced signal.

Abstract: The invention relates to a relay supporting unit for an electric motor to arrange a number of relays at the end of the electric motor, at which winding connections and signal lines of the electric motor are provided. The relays are used to connect and interrupt the power supply to the motor windings. The relay supporting unit according to the invention features a supporting component which is designed in such a way that it extends over the end of the electric motor and has at least one, preferably several, chambers to accommodate and position the relays. A connecting frame is integrated into the supporting component to electrically connect the winding connections and the relays. Furthermore, a sensor PCB is also preferably integrated to which the signal lines of the electric motor can be connected.

Abstract: A motor housing for an electric motor having a housing shell which encloses a space to accommodate the electric motor, and a flexible partition in the housing shell which separates a pressure equalizing cavity from the cavity accommodating the electric motor, whereby the pressure equalizing cavity is connected to the outside environment.

Abstract: A printing mechanism is provided with a rotary cutter mounted on a printing trolley to enable a recording medium or document to be cut as the printing trolley moves during a printing operation. The recording medium is supported by a platen which has a counteracting edge cooperating with the rotary cutter and a control mechanism operates to actuate the rotary cutter between an active position for cutting and a lifted inactive position with a spring operating to apply a spring force against the rotary cutter tending to urge it against the counteracting edge.

Abstract: A needle printing device having a plurality of printing needles mounted in electromagnets with a permanent magnet operating through a yoke to retain a spring upon which the needles are mounted against the core of the electromagnet, the spring having an armature thereon which is released when the electromagnet is energized to permit the needles to be driven into printing position by operation of the spring. The particular features of the invention involve a construction wherein the yoke means is formed in two parts, with the first part having a surface which is formed in a common plane with a surface of the core of the electromagnet, the second part of the yoke having a surface which lies in a common plane with a surface of the armature when the electromagnetic is de-energized with the armature held against the core of the electromagnet.

Abstract: A printing unit is guided along a straight line in parallel relation with the printing plane of a printing support. A device is arranged to pivot the printing unit between at least two printing supports spaced angularly apart. The device includes a coupling assembly interconnecting the printing unit with a drive member. A part of the coupling assembly includes a slotted crosshead or plate in which rollers move through branch slots disposed angularly to one another. Due to the guidance afforded the printing unit as it is pivoted between different angularly spaced printing supports, it moves along a curve significantly flatter than the arc of a circle on which the printing planes of the printing supports are located.