US 6,095,066 AGranted

Eyelet-buttonhole sewing machine

AssigneeDurkopp Adler Aktiengesellschaft

InventorsThomas Noltge, Jochen Fischer

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Abstract

A sewing machine having a table, driven in two directions by two motors and accommodating material to be sewn, sewing tools, and a cutting device for producing a buttonhole in the material to be sewn. The buttonhole is provided with an incision and is bounded by zigzag stitches of a buttonhole bead, running around the incision. The incision is produced either before or after the sewing of the buttonhole bead. The sewing tools include a needle bar, which is driven up and down and also oscillates in the horizontal direction, and a needle, which is provided at the bottom end of the needle bar and interacts with a looper mounted in the base plate. The sewing tools are drivable in a rotatable manner by a third motor. The sewing machine has a control device, from which various buttonhole shapes stored therein can be retrieved, a device for switching from the pre-cutting mode to the post-cutting mode, and a needle-oscillating device driven by a fourth motor and producing the zigzag stitches. The control device also controls the oscillating motion of the needle bar in order to produce the intermediate material, required in the post-cutting mode, within the buttonhole bead.

Claims12

Dependent claims

A sewing machine for producing an eyelet buttonhole in a material to be sewn, the buttonhole being provided by an incision in the material and a buttonhole bead comprising zigzag stitches sewn around the incision, the incision being producible either before or after the zigzag stitches, the sewing machine comprising:

a frame;
a table on said frame for accommodating the material;
first and second motors mounted on said frame and linked to said table for moving said table in two respective directions;
a needle bar carrying a needle and being mounted on the frame for being driven up and down with respect to the table for sewing said buttonhole bead;
a looper cooperating with said needle, said looper being mounted on said frame and being drivable rotationally by a third motor;
a cutting device arranged on said frame for forming said incision in said material;
a zigzag device on said frame comprising a fourth motor for moving said needle horizontally to a plurality of positions to produce the zigzag stitches;
a control device for storing a plurality of parameters for each of a plurality of buttonhole shapes and for controlling said needle, said table, said looper, and said zigzag device for forming each of said plurality of buttonhole shapes;
and
said control device and zigzag device further being operable, when said incision is to be formed after sewing said buttonhole bead, for leaving intermediate material within said buttonhole bead so that said cutting device can form said incision in said intermediate material without damaging said buttonhole bead.

7 more elements

Dependencies are inferred from the claim text.