Pfaff Industriesysteme Und Maschinen Gmbh

Harald Kallenbach

Berthold Becker

Stefan Samstag

Robert Horst Keilmann

A sewing machine has seam-forming tools, comprising a needle for guiding an upper thread and a looper. The needle is designed as a curved needle which is pivotable about a needle pivot axis. This embodiment is such that a distance of the curved needle from the pivot axis is equal to a radius of a curve of the curved needle about the pivot axis. The looper is designed as a looper which is rotatable about a looper rotational axis and has a lower thread reserve. The looper rotational axis runs parallel to a sewing material support region. The sewing machine can be used to produce a durable seam.

Sewing machine

A stitch-forming tool assembly for a sewing machine is used to produce a double-chain stitch seam. A sewing needle of the assembly can be driven up and down in a needle stitching direction perpendicular to a material to be sewn and is designed to guide a needle thread. A looper of the assembly is designed to guide a looper thread and for oscillating movement in an oscillating movement plane. The latter is spanned by the needle stitching direction and by a sewing direction along the double chain stitch seam. During an entire double chain stitch a path of movement of the looper lies completely in the oscillating movement plane. This results in a stitch-forming tool assembly in which in particular a looper drive is simplified.

Stitch-forming tool assembly for a sewing system and sewing system having such an assembly

Sewing machine with a sewing machine housing () comprising a lower housing part (), an upper housing part () with a sewing head () and a stand (), which connects the lower housing part () to the upper housing part (), wherein the upper housing part () comprises a stand-side arm housing section (), a head-side arm housing section () and a joint (), wherein the joint () is arranged in such a manner that the head-side arm housing section () can be swiveled between a preparation position for the picking up/delivering of a sewing material and a sewing position for sewing the sewing material.

A sewing system serves for sewing seams which the multi-dimensionally in space. A needle-bar upper part of a sewing head is mounted so as to be pivotable in a driven manner about a needle-bar longitudinal axis. A gripper lower part is mounted so as to be pivotable in a driven manner, and in a manner synchronous with the needle-bar upper part, about the needle-bar longitudinal axis, in the sewing-head lower part. Motor components for driving the movement of a needle bar, for pivoting the needle-bar upper part, for driving a gripper in a manner synchronous with the needle bar and for pivoting the gripper lower part are disposed outside the needle-bar upper part and outside the gripper lower part. Parts to be sewn that are topographically non-uniform are also rendered accessible.

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Heltersberg, Germany

Harald Kallenbach