Pfaff Industriemaschinen Gmbh

G.m. Pfaff Aktiengesellschaft

Rainer Spickermann

Erich Willenbacher

Bernhard Mertel

Bernd Ellenberger

Karlheinz Schafer

Gerhard Lass

Friedrich Jennet

Walter Sinn

Stitch-forming machine with a transducer and a control device

A device for welding plastic foil strips together with a heating device and a pair of pressure rolls between which the strips are fed, includes a pressure device supported by a spring mechanism for one of two pressure rolls. The pressure device includes a first regulating mechanism for the setting of the width of the gap between the two pressure rolls and a second regulating mechanism for the setting of the welding pressure which is arranged on the first regulating mechanism and which can be moved by it. The regulating units of the two regulating mechanisms are two interacting eccentric elements. This leads to a compact design and only little force is necessary for the setting of the welding pressure.

Device for the welding of plastic foil

A sewing machine having a reciprocating needle bar and a presser foor which is movable upwardly and downwardly to engage material and move it over a sewing station includes a presser foot measuring device. A system for measuring the pressing force of the presser foot of sewing machines comprises a lever type force absorption element which is elastically deformable by the pressing force of the presser foot and which is provided with an electric sensor responding to the deformation. Connected with the sensor is a circuit which contains a digital display on which the pressing force is indicated in newtons.

Sewing machine having presser foot pressure force measuring device

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Thaleischweiler, Germany

Rainer Spickermann