Abstract: A shuttle body 3 having aloop seizing beak 10 for seizing a needle thread 9 is rotatably attached to a shuttle race body 2, pressed by a driver 4, and continuously rotated in a rotation direction B in synchronization with vertical motion of a needle 8. A bobbin case 5 in which a bobbin thread 12 wound around a bobbin 5 is accommodated is attached to the shuttle body 3. Under a state where the bobbin thread 12 is pulled out from the bobbin case 5, the shuttle body 3 is rotated, the needle thread 9 is seized by the loop seizing beak 10, the loop of the needle thread 9 is expanded along the outer face of the shuttle body 3, the loop of the needle thread 9 is passed over the shuttle body 3 and the bobbin case 5 so that the shuttle body 3 and the bobbin case 5 are passed through the loop of the needle thread 9, whereby the needle thread 9 is wound around the bobbin thread 12 and a stitch can be formed.

Abstract: A controller for a sewing machine includes a driving motor 7 for driving a main shaft of a sewing machine head; a detecting unit 9 having a rotation-angle detecting means for detecting a rotational angle of the motor 7; a control section 40 for controlling the motor 7 and receiving a detection signal of the detecting unit 9; an operating section 30 for instructing the operation of the sewing machine; a designating means 34 provided in the control section 40 or the operating section 30 for designating a predetermined position in a vertically moving process of a needle 5 of the sewing machine; and a first memory portion 55 and a second memory portion 131 capable of storing and reading a value designated by the designating means, wherein the first memory portion 55 is provided in the control section 40, and the second memory portion 131 is provided in the detecting unit 9 or the operating section 30.

Abstract: A buttonhole sewing machine including stitching instrumentalities for forming zigzag stitches defining an eyelet-end buttonhole having an eyelet end portion at one end of a foot portion, by operations of a driving mechanism for operating a needle and looper device of the stitching instrumentalities, a feeding mechanism for feeding work fabric feeding table along X and Y axes, and a rotating mechanism for rotating a needle bar and looper base about an axis perpendicular to the X and Y axes, according to stitching data, and wherein the stitching data are compensated by a control device according to a designated one of compensation data sets stored in a compensation data memory.

Abstract: A buttonhole sewing machine including stitching instrumentalities for forming zigzag stitches defining an eyelet-end buttonhole having an eyelet end portion at one end of a foot portion, by operations of a driving mechanism for operating needle and looper device of the stitching instrumentalities, a feeding mechanism for feeding work fabric feeding table along X and Y axes, and a rotating mechanism for rotating needle bar and looper base about an axis perpendicular to the X and Y axes, according to primary stitching data, and wherein a data input device is provided for operation by an operator to specify at least one characteristic of a bar tack portion to be formed at the other end of the foot portion of the eyelet-end buttonhole, and a data generating device is provided for generating tacking data as secondary stitching data on the basis of the specified characteristic or characteristics, to stitch the bar tack portion.

Abstract: A sewing machine arrangement comprises a sewing machine, a motor for driving a spindle, and a motor for operating a two-axis drive mechanism. When the two-axis drive mechanism is driven at a maximum speed, processing is executed in which a speed (t) slower than the maximum speed is inserted by a program. Further, drive current flowing through the motor for driving the two-axis drive mechanism is set. A phase exciting method of a stepping motor is switched.

Abstract: In a method of and an apparatus for drivingly controlling an automatic sewing machine, the time for which a work holding unit is drivingly processed every seam lengths, the time from start of the drive processing of the work holding unit to the time at which the work holding unit starts movement, and the time of movement of the work holding unit are set whereby a drive signal of the work holding unit is controlled such that the work holding unit starts movement and is terminated in movement during a period for which a needle passes through a sewing material. Decision of the drive signal of the work holding unit is executed by a program with respect to all sewing speeds for all sewing lengths.

Abstract: An automatic sewing machine control device in which the movement of the presser unit which takes place while the thread take-up lever moves from the bottom dead point to the top dead point is minimized thereby to increase the tension of the upper thread. Even when the load weight applied to a bi-axial drive mechanism increases or the thickness of the sewing material changes, excellent seams can be formed. In a control device for an automatic sewing machine, a start timing unit is provided which starts the bi-axial drive mechanism with respective timing modes. A plurality of drive control data for a drive motor and stepping motors are stored in memory unit which correspond to the load weights applied to the bi-axial drive mechanism and the thicknesses of materials to be sewed.

Abstract: A control device for an automatic sewing machine in which a cloth presser unit holding a material to be sewed is moved according a predetermined pattern thereby to form a seam having a predetermined pattern. The control device controls the speed of rotation of the automatic sewing machine and the movement of the cloth presser unit with high accuracy to obtain seams which are excellent in quality.

Abstract: A control method and apparatus for controlling an automatic sewing machine having a plurality of memory units different in kind to record sewing patterns in which a particular one of these memory units is automatically selected, and an electric power supply for supplying power for an initial period of time upon occurrence of an electric power interruption is provided. The sewing operation may be externally controlled. The control method and the device for practicing the method can provide an automatic sewing machine which provides interchangeability of software and high reliability, and which can be readily operated on an automation line.

Abstract: A sewing machine control device for controlling the drive of a sewing machine. The sewing machine control device is provided with a monitoring device having a display device for displaying data to identify the direction of rotation and abnormal conditions of the sewing machine.

Abstract: A sewing machine speed control device comprising: memory means for storing speed data representing the sewing speeds suitable for various types of sewing machines, sewing-machine-type selecting means for selecting a desired one of the various types of sewing machines and providing a sewing-machine-type selection signal for the selected type of sewing machine, data selecting means for reading the speed data of the selected type of sewing machine from the memory means in response to the sewing-machine-type selection signal, and speed control means for controlling the sewing speed of the selected sewing machine according to the speed data outputted by the data selecting means.