SYMASKIN MED ANORDNING FOR MODIFIERING AV STYGNEN I ETT VALT MONSTER FOR FORLENGNING AV MONSTRET I TYGMATNINGSRIKTNINGEN

摘要

A sewing machine has a rotatable shaft for operating a stitch forming device, and includes a feed dog for feeding fabric to be sewn, and a needle for forming stitches in the fabric. The machine comprises a first electronic memory for storing stitch control data and including at least the needle position control data for different patterns; pattern selecting element for reading the first memory stitch control data for a selected pattern; timing element operated synchronously with the shaft to produce a timing signal for progressively reading the stitch control data from the first memory; stitch mode changing switch element for determining an elongation rate of a selected pattern to be elongated in a fabric feeding direction; second memory element for temporarily storing designated stitch control data of the first memory element; counter element for counting the ordinals of the stitches of the selected pattern in relation to the timing signals and in accordance with the pattern elongation rate to thereby designate the pattern elongation rate and the stitch control data to be stored into the second memory element progressively during formation of the stitches of the pattern; and calculating element operable with respect to the counter element (CT1, CT2) to make a calculation to produce second stitches between the first stitches formed by the stitch control data.