Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik

Fritz Gegauf Aktiengesellschaft

Lorenz Reber

Karl Nufer

Heinz Janouschek

A presser foot for a sewing machine includes a presser foot with a shank. The end of the presser-foot shank is articulated with a presser-foot sole having a stitching opening for a needle, which is attached to a needle bar. The presser-foot sole is capable of being swung relative to an upper-part of a housing therefor about the axis of the needle. In a preferred embodiment, the presser foot of the invention, which is connected to the sewing machine in a manner so that it is capable of being swung at least 180.degree., makes it possible for the operator of the sewing machine to adjust the presser foot and/or the presser-foot sole so as to make it essentially parallel to the sewing direction and, in this fashion, to allow the sewing-over of thickenings, hemmed borders and the like.

Presser foot with swinging presser foot sole for a sewing machine

Elementary patterns are sewn in a sewing machine wherein the work can be fed by increments T. The making of a pattern involves repeatedly moving the work in and counter to the feed direction between starting the final needle penetration points which are spaced apart a distance nT wherein n is a whole number exceeding one. This results in the making of several continuous thread legs each having a length nT which can exceed, at least slightly, the maximum bight range of the needle and each extending all the way between the starting and final penetration points. In order to form a second elementary pattern which intersects the first pattern, the work is fed to move the needle to an intermediate penetration point, for example, midway between the starting and final penetration points, and the work is then fed to position the needle at the starting penetration point of the second pattern. One or more stay stitches are formed at the starting and/or final penetration point of each elementary pattern in order to increase the amount of thread in the pattern and to reduce the likelihood of deformation of the work under the action of tensioned thread legs.

Method of making sewn patterns with sewing machines

A row of at least two coherent cruciform elementary patterns of stitches is formed in a zig-zag sewing machine by first making a first series of at least two zig-zag stitches and by thereupon making a second series of at least two zig-zag stitches which are mirror images of the stitches of the first series and each of which crosses a different stitch of the first series of stitches. The needle is caused to penetrate into the work in the middle of the first or last stitch of the first series of stitches prior to making the second series of stitches. Each stitch of the first and second series of stitches includes at least one uninterrupted length of thread. Only one crossing point of the stitches which form the first and second series is located at a needle perforation point. The first row of at least two cruciform elementary patterns can be followed by any desired number of additional rows in any desired orientation to form ornamental or other arrays of rows of cruciform patterns.

Method of making groups of sewn patterns with zig-zag sewing machines

The takeup limb of each needle thread loop in a central bobbin hook type sewing machine is engaged by a kidney-shaped cam on the shuttle hook driver and by a projection on the housing for the hook while the takeup lever of the machine reduces the size of the loop. This ensures that the takeup limb is held and the loop is guided substantially during the entire interval of reduction of the size of the loop. The cam has a lobe with a groove for the takeup limb, and the projection of the housing engages the loop prior, during and subsequent to withdrawal of the takeup limb from the groove of the lobe.

Growing community of inventors

Gaienhofen, Germany

Lorenz Reber