Abstract: A sewing machine includes a needle plate with a cutout part, and a guide plate connected to a bottom side of the needle plate and extending substantially across the cutout part. The guide plate includes a pair of slide rails, an opening substantially corresponding in position to a bobbin case, and a curved thread guide slot having one end communicated with the opening and another end extending to one of the slide rails. A slide cover covers the cutout part and is slidable along the slide rails. A cutter is disposed at the lateral edge proximate to one of the slide rails. A lower thread guide extends along one of the slide rails from another end of the thread guide slot toward the cutter for guiding a lower thread from the bobbin case to extend to the cutter.

Abstract: A thread cutting device in a sewing machine includes a fixed knife and a movable knife cooperating with each other to cut a thread. The movable knife is movable to bring a part of the thread to extend below the fixed knife for the cutting operation. A thread protection member is operable to support the thread so as to prevent the thread from breakage prior to the cutting operation through cooperation between the fixed knife and the movable knife. The thread protection member is formed separately from the fixed knife.

Abstract: A multi-needle chain stitch sewing machine with a thread thread severing system and method thereof for cutting needle threads between two isolated stitched patterns of a fabric. The multi-needle sewing machine includes a plurality of loopers and respective needles, a thread severing strip located in close proximity and transversely across each looper, and eccentric guides connected to the thread severing strip for extending the thread severing strip to cut the needle threads and for retracting the thread severing strip so that the thread severing strip does not contact the needle threads during the stitching operation.

Abstract: A sewing machine carries a sewing needle which in turn carries a thread through a stitching aperture of a throat plate beneath which is located a gripper carried by a gripper shaft. The gripper is defined by a gripper neck, a gripper hook and a gripper knee joining the gripper hook and the gripper neck. Located adjacent the gripper bend is a thread-cutting blade. A cam, link and linkage system is provided for selectively driving the gripper shaft to selectively (a) move the gripper (7) a predetermined distance through which the cutting blade is inoperative and (b) move the gripper a further distance beyond the predetermined distance through which the cutting blade is operative to cut-off the thread. A stop boss is also provided adjacent the gripper bend to prevent the thread from being cut during motion of the gripper the predetermined distance.

Abstract: A cutting apparatus for embroidery machines that facilitates the positive cutting of the threads at the end of each embroidery operation. Large-scale embroidery machines may provide several hundred embroidery positions, and each position is provided with an individually-actuable cutting and gripping device. These individual cutting mechanisms are in turn collectively mounted on one or more feeder bars that permit the pivotal movement of the cutter/grippers into and away from a position in close proximity to the embroidery needle stitch points. This pivotal movement permits the close cutting of the thread when required, yet otherwise locates the thread cutter/grippers at a position away from the stitch points during the embroidery operation itself.

Abstract: An upper thread holding device for use in a sewing machine having a body and a needle from which an upper thread depends, the device includes a holding member pivoted to the body and movable between a waiting position and an upper thread holding position in such a manner that the holding member passes an upper thread taken-off position located between the needle and the waiting position, a driving device for moving the holding member, a stationary blade connected to the body so as to be in sliding engagement with a lower surface of the holding member and designed for cutting the upper thread in cooperation with the holding member in its return movement at the waiting position, and a press plate fixed to the stationary blade and defining a space therebetween in which the holding member is accommodated in its waiting position for holding between the press plate and the holding member.

Abstract: An electronically controlled multi-needle quilting machine including linking cylinder arranged between an eccentric integral with a rotating spindle and a lever, to drive in an oscillating motion a number of loopers which, in combination with a number of corresponding needles, perform stiching operations by double chain stitches on a layered material interposed between said members, said linking cylinder comprising a pneumatic cylinder controlled to change the extension of its rod during the various operational steps, whereby the link length is changed and the loopers may reach a position in which, by being provided with a blade they perform a cutting operation on thread of respective needle.

Abstract: A thread cutting device includes a movable knife positioned below a throat plate and movable from a first position to a thread cutting position via a second position for separating the upper fabric thread and the upper needle thread from each other within the range where the movable knife may engage the upper fabric thread and the upper needle thread but may not engage or cut the lower thread. The movable knife includes an engaging portion for engagement with the upper needle thread on the side toward the second position and a cutting edge on the opposite side. The movable knife also includes a thread separating portion for separation of the upper fabric thread and the upper needle thread between the needle hole and the bobbin holder from each other toward the cutting edge and the engaging portion, respectively, when the movable knife moves from the first position to the second position.

Abstract: A cover thread cutter for a multi-needle sewing machine, the hook of the thread cutter retracts at an oblique angle above a curved cover thread laying finger and captures the cover thread at a position above the curved cover thread laying finger. While pulling the captured cover thread up to the cutting position, it is held against a specified needle, as in ordinary seam forming, and the thread end is held in this state after being cut off.

Abstract: A thread cutting unit cooperating with the bed of a sewing machine includes a lower shaft, a cutting knife and a loop spreading plate respectively fixed to the lower shaft and positioned adjacent to the hook. The thread cutting knife and the loop spreading plate cross each other in a space between the hook and the throat plate. The thread cutting unit is provided with a thread cutting driving unit which comprises a thread cutting knife driving shaft, a loop spreading plate driving shaft, a rotational motion transmission device, a thread cutting supporting member carrying thread cutting knife, a first turnable interlocking mechanism and a second turnable interlocking mechanism. The thread cutting supporting member is rotatably supported on the bed.

Abstract: A thread-cutting device for zigzag sewing machines for forming uniformly short thread ends regardless of the top stitch position of the last stitch. The thread cutter 28 is movable in a plane that is parallel to the thread catcher 33 and is connected by a drive unit 45 through 58 having stop sections 54, 55 to the drive of the thread catcher 33 such that the thread catcher can be moved, together with the cutter, into the cutting position located below the center of the stitch hole. While the thread cutter 28 stops in the cutting position, the thread catcher completes the thread separation process. The thread cutter 28 is moved back during the return movement of the thread catcher 33 only after the threads have been cut. The drive unit 45 through 58 for the thread cutter 28 is of positive-locking design, as a result of which even thick threads are cut reliably. The thread cutting device is particularly suitabloe for installation (even subsequent installation) in stitch group zigzag sewing machines.

Abstract: The bottom plate of a cloth presser supporter is pivotally mounted on a lower end of the supporter adjacent a rear end of the plate. The plate has an L shaped slot, one slot leg being a needle location groove, the other slot leg being a needle thread guide. The plate has a knife receiving groove with a knife mounted therein. A thread holder holds the end of a thread vertically above the plate so that the thread when extended between the held thread end and the first zigzag stitch of the thread does not extend over a corner defined by the intersection of the side wall of one slot leg with the corresponding side wall of the other slot leg.

Abstract: A thread cutter for an interlock sewing machine wherein the sewing machine has a small diameter cylindrical arm and the cloth being sewn is fed along the axis of the arm. A plurality of needles are disposed along a line orthogonal to the axis of the arm and an arcuated, movable member having a hook at its tip is pivotably supported ahead of feed dogs on the sewing machine relative to the line of feed. The arcuated, movable member is turned by means of an operative plate disposed along the axis of the arm and, in cooperation with a fixed blade, cuts threads after the cloth has been sewn.

Abstract: A thread-cutting device for a sewing machine comprises a cutter having a cutting edge and a thread guiding member which holds the cutter. The thread guiding member is formed with thread guiding edges which obliquely cross the cutting edge of the cutter, and leads the threads between its two parallel thread guiding edges and the cutting edge of the cutter. A crossing point between the thread guiding member and the cutting edge of the cutter is adjustable.

Abstract: A device is disclosed for pulling out and cutting off the needle and looper threads in a sewing machine with a delivery roller for delivering material to the machine sewing station. The delivery roller is driven over a first drive, which is dependent on the sewing machine main drive and over a second drive, which is independent of the sewing machine main drive. On the looper of the sewing machine is secured a cutting blade for the needle thread. Furthermore, a needle thread clamp is provided. In order to manage, with a single means for pulling out the needle and looper threads by different lengths, a cutting device for the looper thread is arranged between the cutting blade and the delivery roller, with a guide which is traversed by a thread inlet groove and with a counterknife for a thread severing knife that moves transverse to the material feeding direction. The delivery roller is driven over the second drive for pulling out the threads.

Abstract: A single-operation cam mechanism includes a cam body with a cam surface extending along the body from an entrance location to an exit location. A cam follower is retained in a waiting position adjacent a part of the cam body at which the exit location is found. When the cam follower is moved free of the retainer, a spring forces the cam follower to the part of the cam where the entrance location is found. Then, as the cam rotates, the cam surface engages the follower and forces it back through the exit location and past a resilient trap to the waiting position. The trap snaps shut after the follower has been forced past it, and the surface of the trap then prevents the follower from moving back into engagement with the cam surface except by way of the entrance location. In an underbed thread trimmer, a support member for the cam follower engages a pin connected to blade-like members, some of which have hooks, to carry one set of such members to a position in which their hooks engage looptaker thread.

Abstract: A sewing machine is provided with a needle thread cutting device for severing the free end of the needle thread extending through the eye of the needle at the beginning of a sewing operation to prevent entanglement of the free end with the stitches being formed. A cutter element is mounted for oscillating movement in conjunction with the raising and lowering of the presser foot. The lower end of the cutter element is provided with a transverse leg extending across the upper surface of the presser foot in close proximity thereto rearwardly of the needle. The transverse leg portion is provided with a cutting edge on the side thereof remote from the needle.

Abstract: A thread-cutting assembly for use with a sewing machine that always presents a sharp cutting edge for thread cutting. The assembly includes a circular cutting disk having a circumferential cutting edge, and a guard plate for preventing access to the majority of the circumferential cutting edge of the disk but exposing a portion of the disk circumferential cutting edge. The disk is mounted to the guard plate so that the disk rotates with respect to the guard means about an axis when thread to be cut by the disk is brought into engagement with the exposed portion of the disk so that a new cutting surface is exposed, and the guard plate is operatively mounted to a sewing machine. The guard plate also sharpens the cutting edge of the disk upon rotation of the disk with respect to the guard plate, the guard plate being formed of metal having a greater temper than the metal of the disk.