Abstract: A method for producing a connection between a metal surface and a plastic surface, in which a collar-shaped bead and a lateral surface with a shoulder-shaped ledge for the placement of the plastic surface are formed at least one edge at the metal surface, before the placement of the plastic surface a strip-like seal is introduced onto the ledge. The plastic surface is placed on the ledge of the lateral surface in such a way that a lateral surface of the plastic surface is lined up with the lateral surface of the metal surface in a butt-joint-like manner, and a form-fitting, elastically supported connection is created by forming between at least one part of the lateral surface of the metal surface and one part of the lateral surface of the plastic surface, so that a substantially seamless and substantially smooth transition between the metal surface and plastic surface is formed at the connection site on the top side of the metal surface and the plastic surface.

Abstract: A method is provided for inserting a plastic body into an opening of a sensor housing, whereby the opening has a lateral surface with an edge, in that a collar-shaped bead is formed at the edge and a shoulder-shaped ledge at the lateral surface for the placement of the plastic body, before the placement of the plastic body a strip-like seal is introduced onto the ledge, the plastic body is placed on the ledge of the lateral surface in such a way that a lateral surface of the plastic body is lined up with the lateral surface of the sensor housing in a butt-joint-like manner, a form-fitting, elastically supported connection is created by means of forming between at least one part of the lateral surface of the sensor housing and one part of the lateral surface of the plastic body, so that a substantially seamless and substantially smooth transition between the sensor housing and the plastic body is formed at the connection site on the top side of the sensor housing and of the plastic body.

Abstract: A method and apparatus for the detection of an edge of an object, with at least two photoelectric barriers, having at least one sender and at least one receiver apparatus as well as at least one common evaluation electronic unit for the detection of the edge or the presence of the object found on a transparent transporting belt. A diaphragm apparatus creates specially shaped light beam cross sections, wherein at least one light beam (B) is irradiated as a sufficiently narrow slit (5) in the direction of the edge to be detected, wherein the signals of the photoelectric barriers (3,4,10,11,12,13,14) are logically interconnected in the common evaluation unit (8).