Optilon W. Erich Heilmann Gmbh

Wifo Wissenschaftliches Forschungs-institut A.g.

Wito Wissenschaftliches Forschungs-institut A.g.

Helmut Wulz

Paul Heinzer

Helmut Heimberger

A slide fastener has a pair of tapes along confronting edges of which are provided respective rows of coupling elements in a ladder configuration with individual members being affixed together by a continuous textile strand, as one-arm rungs of the ladder. Each coupling member is molded unitarily and unbent, and comprises an upper portion and a lower portion separated by a plane parallel to a slide fastener plane. The head of each coupling member lies above this plane and is mushroom-shaped to have a neck reaching inwardly toward the respective edge of the tape. Flush with this plane but on the lower half of the coupling member are a pair of ledges which function to absorb forces transverse to this plane. The connecting yarn is embedded in the upper half which can be provided for connection to the tape.

Slide fastener

A method of and an apparatus for the formation of slide-fastener stringers wherein coupling members of a thermoplastic synthetic resin are bent into a U configuration to straddle the edges of respective fabric support tapes also composed of thermoplastic synthetic-resin filaments or yarns at least in the region in which the tape is straddled by the shanks of each coupling member. The shanks of the coupling members are thermally welded together through the tape and thereby also bonded to the filaments or yarn between the shanks; thereafter the tapes bearing the coupling members are subjected to thermofixing i.e. heating to shrink the tapes thereby condensing the meshes formed by the yarn or filaments.

Slide fastener and method of making same

Apparatus for fixing electrophotographic images carrying toner powder and comprising an upper heated fixing roller and a lower driven counter roller cooperating with the fixing roller to form a nip for the passage of image bearing sheets to be fixed, the fixing roller having a resilient tubular shell of metal or other material of high thermal conductivity.

Apparatus for fixing electrophotographic images

Apparatus for fixing electrophotographic images produced by an electrophotographic copying machine, comprising a conveyor belt for transporting image bearing sheets on its upper run and a planar heater which extends substantially parallel to the upper run and is disposed closely above it but out of contact with the sheets.

Electrophotographic copying machines

A photocopying machine which includes a band conveyor for transporting sheet material through the machine, the conveyor including end drums supporting a band of seamless and endless perforated metal with its upper run disposed over a suction chamber.

Growing community of inventors

Birmensdorf, Switzerland

Helmut Wulz