Emag Maschinenfabrik Gmbh

Emag Mashinenfabrik Gmbh

Herbert Scholl

Rudi Metz

A parts handling device is provided having a movable carrier on which is disposed a plurality of coil wound magnet poles. At least one of the poles is wound and with an A.C. source so that its current or voltage is subject to changes in response to induced magnetic flux caused by its proximity to a ferro-magnetic material. The changes in current or voltage so induced is sensed by a low impedance device or a resonant circuit device and an electric signal is produced which is employed to convert said poles to D.C. excitement control the operation of the parts handling device.

Part handling device

A permanent magnet with a split magnetic flux conductor between the pole shoes serves to attract a magnetizable load to the pole shoes of an electromagnet whose pole shoes constitute extensions of the pole shoes of the permanent magnet and whose split magnetic flux conductor extends between the respective pole shoes in parallel with the other conductor. An armature is movable into the gap between the parts of the magnetic flux conductor of the permanent magnet or between the parts of the magnetic conductor of the electromagnet by a fluid-operated motor or by the application of d-c current of proper polarity to the exciting coils of the electromagnet. The permanent magnet ceases to attract the load to the pole shoes of the electromagnet when the armature is moved into the gap between the portions of the magnetic flux conductor of the electromagnet. The coils of the electromagnet are connected to a source of d-c current to energize the electromagnet and to attract the load, and with a source of a-c current to demagnetize the load. The armature is held in the gap of the magnetic flux conductor of the permanent magnet when the electromagnet is energized to attract the load. The influence of the permanent magnet upon the load is eliminated in response to movement of the armature into the gap of the magnetic flux conductor of the electromagnet.

Magnetic gripping device

A single or composite lifting electromagnet has several cores whose poles can attract round, elongated or otherwise configurated ferromagnetic objects. The cores are surrounded by and/or flank discrete sensors in the form of Hall generators or induction coils which are provided in addition to exciting coils for the cores. The sensors are disposed centrally of or mirror symmetrically around the center of the electromagnet, and the purpose of the sensors is to generate signals in response to changes of the electromagnetic field to thereby facilitate automatic guidance of the electromagnet toward an optimum position with reference to an object which is to be lifted and transported, e.g., to the treating station of a machine tool.

Lifting electromagnet

A lifting electromagnet for ferromagnetic workpieces has two composite cores which extend downwardly from a yoke. Each core has a first section which is rigid with the yoke and is surrounded by an exciting coil, a second section which is connected with the respective first section, and at least one third section which is movable with reference to the second section, either up or down or horizontally. The poles at the lower ends of the third sections make an angle of 120 degrees, the same as the poles at the lower ends of the second sections. The second sections are surrounded by induction coils, and a further induction coil is disposed between each pair of neighboring third sections. The distance between the second sections is less than the distance between the first sections, and the distance between the second sections exceeds the distance between each pair of third sections. Each pair of third sections forms part of an auxiliary magnet which is movable up and down or horizontally, depending on the nature of the workpieces which are to be lifted and transported by the electromagnet. An electromagnet with one or more horizontally movable auxiliary magnets is used for the transport of elongated workpieces, and an electromagnet with one or more vertically movable auxiliary magnets is used for the transport of large- or small-diameter workpieces.

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Goppingen, Germany

Herbert Scholl