A bobbin holder that grasps a holder body and a flange of a bobbin that winds a thread n around the holder body, the holder including: an opening formed in an upper surface of the holder body; a thread holding portion that holds a thread n and is arranged in the opening so as to protrude from a center of the holder body toward an outer circumference of the holder body; and a cutting blade that cuts the thread held by the thread holding portion, the blade being disposed in one of regions inside the opening that is partitioned by the thread holding portion, wherein the cutting blade is disposed on a thread path of the thread n being pulled after the thread n, which is wound around the bobbin grasped by a grasping portion and is pulled from the other region inside the partitioned opening, is held by the thread holding portion.

A system and methods for stitching are disclosed. The system includes a first thread feeding mechanism configured to feed a continuous supply of a first thread, a second thread feeding mechanism configured to feed a continuous supply of a second thread, a plate separating the first thread feeding mechanism and the second thread feeding mechanism, and a knot tying mechanism configured to pass a bight of the first thread for at least one turn around a portion of the second thread and securing the bight around the second thread.

A system and methods for stitching are disclosed. The system includes a first thread feeding mechanism configured to feed a continuous supply of a first thread, a second thread feeding mechanism configured to feed a continuous supply of a second thread, a plate separating the first thread feeding mechanism and the second thread feeding mechanism, and a knot tying mechanism configured to pass a bight of the first thread for at least one turn around a portion of the second thread and securing the bight around the second thread.

A sewing unit has a CNC controller and a sewing machine. The sewing machine has a workpiece bed plate, an upper sewing part and a lower sewing part. The lower sewing part has a looper with a lower thread supply in a looper bobbin case. The looper can rotate about an axis which extends parallel to the workpiece bed. A bobbin case holding component disposed in the region of the workpiece bed is in engagement with the looper bobbin case such that it does not co-rotate the looper bobbin case during a rotation of the looper. The lower sewing part has a bobbin case lifter to displace the looper bobbin case between a neutral position and an opened position in which a free space for a thread between the looper bobbin case and the bobbin case holding component is enlarged in comparison with the neutral position.

A sewing unit has a CNC controller and a sewing machine. The sewing machine has a workpiece bed plate, an upper sewing part and a lower sewing part. The lower sewing part has a looper with a lower thread supply in a looper bobbin case. The looper can rotate about an axis which extends parallel to the workpiece bed. A bobbin case holding component disposed in the region of the workpiece bed is in engagement with the looper bobbin case such that it does not co-rotate the looper bobbin case during a rotation of the looper. The lower sewing part has a bobbin case lifter to displace the looper bobbin case between a neutral position and an opened position in which a free space for a thread between the looper bobbin case and the bobbin case holding component is enlarged in comparison with the neutral position.

A method for producing a smart textile includes stitching with a conductive thread from a first point outside a segmented area that is set on a sheet material toward a second point on the segmented area. An embroidery with the conductive thread is sewn from the second point as a starting point to apply a segment in the segmented area. These series of steps are executed without performing a process for cutting the conductive thread by stopping the sewing process of the conductive thread.

A method for producing a smart textile includes stitching with a conductive thread from a first point outside a segmented area that is set on a sheet material toward a second point on the segmented area. An embroidery with the conductive thread is sewn from the second point as a starting point to apply a segment in the segmented area. These series of steps are executed without performing a process for cutting the conductive thread by stopping the sewing process of the conductive thread.