Leister Technologies Ag

Leister Process Technologies

Ulrich Gubler

Michael Scheidt

Erich Stauffer

Pius Barmet

Daniel Vogler

Oliver Hinz

Christoph Raab

Hannes Kühl

Reto Zurbuchen

Simon Ott

Thomas Didden

Hannes KÜHL

Michel Prestat

The invention relates to a process for the adjustment of a laser light spot of high intensity for the laser processing of work pieces as well as a laser device for performing the proposed process. The laser device comprises a laser emitting a laser beam and at least one focusing lens for converging the laser beam as well as an optical operating element for adjusting the beam diameter of the laser beam. The invention proposes to use as operating element a diffractive optical element that separates the laser beam emitted by the laser into partial laser beams, with the partial laser beams generated by the diffractive optical element being assembled to form a resulting laser beam that acts on the work piece. By means of a suitable design of the diffractive optical element it is possible to adjust, in particular enlarge, the diameter of the laser light spot as required.

Process for the adjustment of a laser light spot for the laser processing of work pieces and a laser device for the performance of the process

A device and a process for processing and/or joining work pieces via laser radiation, with an effective power laser and a pilot target laser that emit laser beams of different wavelengths, with the laser beams being directed at the work pieces by laser optics. Regarding the laser beams, by the laser optics that comprise at least one diffractive optical element (DOE) as a masking system, the beam pattern of the pilot target laser is adjusted to match the beam pattern of the effective laser beam. This is accomplished preferably by removing the pilot laser beam from the effective laser beam for part of the path length by dichroic mirrors, and by expanding the diverging pilot laser beam on said part of the path length by deflecting mirrors whose distance from the dichroic mirrors is variable.

Laser operating process and laser device

The invention relates to a laser head () for connecting tubular parts () by the laser transmission method and to a method of connecting the tubular parts () by means of the laser head (). The laser head () and the method that can be performed by the laser head () are suitable in particular for connecting a connecting element or branching element () to one end of a plastic pipe (). The laser head () makes simultaneous welding possible and has at least two shell parts () that can be radially separated from each other so that the laser head () can be placed around a connecting section () or a connecting region () of the tubular parts (). A number of laser sources () are arranged in the shell parts () in such a way that the laser beams () emerging from the laser sources () overlap at the connecting section () or at the connecting region () of the parts ().

Laser head and method of connecting tubular parts by the laser transmission method

The invention relates to an electric hot wedge () for a welding device for the seam-like connecting of plastic webs, having a welding wedge () and a welding wedge attachment () made of metal, wherein the welding wedge () comprises at least one electric heating resistor () having a heating conductor (), which is bonded to a ceramic carrier () as a conductive layer () and is preferably protected by a ceramic cover layer. According to the invention, the welding wedge attachment () has a support structure () made of metal on the side thereof, which substantially extends across the entire length and/or width of the electric heating resistor () and which mechanically stabilizes the carrier () of the heating resistor ().

Electric hot wedge

An induction connecting sleeve for connecting weldable thermoplastic elements by means of fusion, with at least two sockets for the insertion of connection sections of the thermoplastic elements to be connected, and with an induction heating element embedded in the sockets, with operative sections of the induction heating element surrounded completely by a weldable thermoplastic material, and with the induction heating element arranged coaxially to the sockets. The induction heating element may be manufactured of metallic material with spring characteristics and to embed it under pre-tension in the thermoplastic material of the sockets. When the induction heating element is heated and the thermoplastic material of the socket of the induction connecting sleeve is plasticized, the induction heating element relaxes which causes radial pressure to build towards the connection section.

Induction connecting sleeve for connecting weldable thermoplastic elements by means of fusion

The invention relates to a method for connecting material webs disposed with overlapping edges, wherein an automatic welding machine having a driven chassis and a drive unit disposed thereon and a welding unit is guided along the overlap zone of the material webs to be connected, such that the carried welding unit connects the edges to be connected to one another. The invention further relates to an automatic welding machine for performing the method. The invention proposes that a temporary guide marking moving along with the chassis be generated along the edge of the overlapping material web by means of a marking unit disposed on the chassis, said guide marking always extending parallel to the edge and prescribing the path of the automatic welding machine on the overlapping material web and that the guide marking be detected by means of a sensor device during the movement of the automatic welding machine, wherein a control signal is generated for a display unit and/or the drive unit and the chassis is movable along the guide marking by means of the control signal.

Growing community of inventors

Rotkreuz/ZG, Switzerland

Ulrich Gubler