Abstract: A presser foot drive structure of an embroidery machine, by which a vertically movable presser foot for preventing a sheet of cloth to be sewn from rising in a sewing operation is vertically moved inside a sewing head. The presser foot drive structure includes a presser foot drive holder, which is vertically slidable and is mounted on the outer circumference of a needle bar, which is vertically driven; a presser foot drive shaft, which is disposed parallel to the needle bar via the presser foot drive holder; and the presser foot, which is disposed at the lower end of the presser foot drive shaft and vertically reciprocates. It is possible to reduce the stroke of a presser foot so that it is smaller than that of a needle bar, enhance the supporting force for a needle bar, and reduce the shaking of a presser foot.

Abstract: An apparatus for lifting the presser foot of an embroidery machine includes an arm having an upper shaft providing a driving force, a presser foot driving cam mounted on the upper shaft, a transmission member coupled to the presser foot driving cam and making an oscillating motion, a presser foot driving lever connected to the transmission member and pivoting around a predetermined pivoting point thereof in a vertical direction, a presser foot driving block reciprocating along a needle bar guide shaft according to an amount that the presser foot driving lever is pivoted and moving the presser foot in a vertical direction, and a presser foot height adjustor, displacing the pivoting point of the presser foot driving lever to adjust a height of the presser foot.

Abstract: Disclosed is a needle plate for a double-needle sewing machine. The needle plate includes a partition extending downward between the needle holes and provided with a thin plate insertion slit in an intermediate portion thereof, and a thin plate inserted into the thin plate insertion slit. Thus, the rigidity of a thin wall formed between the needle holes is reinforced by providing the partition and the thin plate inserted into the partition between the needle holes, so that stitches can be formed in parallel without breakage of the needle plate even when the interval between the needle holes is less than 2 mm.

Abstract: Disclosed is a needle plate for a double-needle sewing machine. The needle plate includes a partition extending downward between the needle holes and provided with a thin plate insertion slit in an intermediate portion thereof, and a thin plate inserted into the thin plate insertion slit. Thus, the rigidity of a thin wall formed between the needle holes is reinforced by providing the partition and the thin plate inserted into the partition between the needle holes, so that stitches can be formed in parallel without breakage of the needle plate even when the interval between the needle holes is less than 2 mm.

Abstract: A sewing machine comprises: a head portion having a sewing needle driven to vertically reciprocate; a lower shaft having a shuttle connected thereto which is driven to rotate synchronized with the vertical movement of the sewing needle cooperating to form stitches; a table positioned above the lower shaft; a retainer positioned above the table to retain a material for forming stitches thereon; a holding frame placed parallel to the table, the head portion being mounted at a position on the holding frame; and supporting posts adapted to support opposite ends of the holding frame for positioning the holding frame above the table. The sewing machine allows a material to be sewn, which is retained retainer, to be easily mounted or removed.

Abstract: Disclosed is an apparatus and method for controlling feed quantity and direction in a sewing machine, in which feed quantity and direction of a workpiece is controlled by a motor, thereby not only allowing various patterns to be produced by stitches made up of upper and lower threads, but also allowing a speedy sewing operation. The apparatus comprises an operator interface means for inputting the feed quantity and direction of a workpiece according to an operator's plan, a motor driving control means for outputting a motor driving control signal according to feed information on the feed quantity and direction of the workpiece inputted through the operator interface means, and a workpiece feed control means for controlling rotation direction and speed of the motor according to the motor driving control signal from the motor driving control means.

Abstract: Disclosed is an apparatus and method for controlling feed quantity and direction in a sewing machine, in which feed quantity and direction of a workpiece is controlled by a motor, thereby not only allowing various patterns to be produced by stitches made up of upper and lower threads, but also allowing a speedy sewing operation. The apparatus comprises an operator interface means for inputting the feed quantity and direction of a workpiece according to an operator's plan, a motor driving control means for outputting a motor driving control signal according to feed information on the feed quantity and direction of the workpiece inputted through the operator interface means, and a workpiece feed control means for controlling rotation direction and speed of the motor according to the motor driving control signal from the motor driving control means.