Abstract: The invention relates to thread trimming devices for eyelet buttonhole machines. The invention comprises a thread trimming device having a snap action spring arm knife. As the thread hook positions the thread and gimp, a cam lifts up the end of the spring arm. The cam then releases the knife whose torque snaps down and cuts the thread and gimp against a second knife edge. The thread and gimp are also held together at this point for the next buttonhole by a thread retainer which is built into the knife.

Abstract: To fold-in an end of a folded waistband (7) into the inside thereof, e.g. for a trouser or skirt, the upper (7a) and lower (7b) parts of the U-shaped waistband are seized by upper and lower gripping elements (5,9,18;6,10,19) such as paired fingers, or tongs, which are arranged in an upper and lower mechanical module (1,2). The ends of the folded upper (7a) and lower (7b) parts of the waistband are then opened, by spreading-apart of the gripping elements by relative movement of the modules 1,2, and the protruding terminal end portions of the waistband are folded into the inside of the waistband by sliders (12,13).

Abstract: A needle thread wiping device having a mounting bracket supported beneath the head behind the needle bar. The mounting bracket supports a pair of shafts which extend laterally therefrom towards both sides of the head. A thread wiper assembly may be fastened to one side or to both sides of the mounting bracket by means of a lever which may be affixed to a forwardly located shaft by a set screw. One end of the lever carries a sleeve. A link is carried on the second shaft, the link also carrying a sleeve, both sleeves slidably supporting therein a thread wiper having a hooked end. A back plate is provided having a curved slot supported on the second shaft and having a pivotal connection to the sleeve in the end of the lever. The thread wiper also has a connection to the back plate.

Abstract: A horizontal axis loop taker is actuated by a loop taker shaft supported in an eccentric opening in a rotatable bearing located immediately adjacent the loop taker. In a first position of the rotatable bearing, a sewing needle may extend through an orifice in a throat plate to cooperate with the loop taker in the formation of stitches. In a second position of the rotatable bearing achieved by rotating the bearing in a direction to locate the eccentric opening, and thereby the loop taker, further from the throat plate, the sewing needle will not cooperate with the loop taker. The increased clearance thus provided between the loop taker and throat plate will more readily accommodate thread severing devices.

Abstract: A thread guiding system for sewing machine bobbin winders in which the last thread constraining eyelet is positioned laterally centrally of the bobbin spindle and a plurality of smooth surface guide pins are positioned between the thread constraining eyelet and the bobbin with the axis of each pin parallel to that of the bobbin spindle. The pins exert no lateral influence on the thread which is allowed to move freely along the pins. With this construction the distance from the last thread constraining position to the bobbin is greatly reduced from that normally required for smoothly winding thread uniformly about the bobbin.

Abstract: An underbed thread trimmer mechanism for severing the needle and bobbin threads upon completion of a sewing operation. Operation of the thread trimmer may be selectively initiated by operator command. A plurality of cams and members cooperate to transfer power from a loop taker shaft to a thread handling disc-like member situated in close proximity to the sewing machine loop taker. A thread cutting knife is disposed in covering relation to the thread handling member and cooperates with the thread handling member to trap the needle and bobbin threads and direct them to a knife surface of the thread cutting knife where they are severed. The mechanism that drives the thread trimmer resets itself at the completion of the thread cutting cycle.

Abstract: A driving mechanism for actuating an underbed thread trimmer in a post-type sewing machine. The unit is selectively controlled by a solenoid and actuated by two cams located on the hook shaft of the feeding post. Rotary motion of the shaft and cams is converted into translational motion for the trimmer by a pivoting swivel lever and cam follower combination.

Abstract: A needle jogging mechanism for zigzag sewing machines which employs an edge cam driven by the main drive of the sewing machine. This cam is embraced by a pair of roller followers each carried on one of a pair of parallel follower levers interconnected by a cross-link the pivotal fastenings of which include eccentrics for adjusting the followers against the cam. An additional link is also provided for transferring the movement of the follower levers to a needle bar gate.

Abstract: A control device for a zigzag sewing machine is disclosed in which the width of zigzagging and the neutral position of needle vibration may be separately influenced and in which for any given maximum width of zigzag stitching the extreme left and right hand neutral positions of needle vibration can always be made to coincide with the left and right hand sides of that maximum width of zigzag stitching.

Abstract: A bobbin thread depletion signal for lock stitch sewing machines or the like. The bobbin, which is constructed so that one of the end flanges is free to slide axially along the hub, is horizontally mounted in the machine bobbin carrier. When thread is wound on the bobbin, the slideable flange is forced outward against a stop and is positioned in the field of an electronic sensor, such as an oscillator coil, the inductance of which is altered by a proximity of the slideable flange.When the thread is removed from the hub, the slideable end flange will drop from the environment of the sensor toward the stationary flange thereby producing an inductance change that is detected by electronic sensor circuitry that signals the sewing machine operator.

Abstract: A mechanism is disclosed in which the main driving mechanism of a sewing machine is harnessed simultaneously to actuate a thread wiper and a tension release mechanism for the sewing machine. Operation of the mechanism may be initiated by a solenoid which may be advantageously small in size and power since the solenoid does not supply any of the driving force incident to the operation of the thread wiper or tension release mechanisms.

Abstract: A drag link feeding mechanism for a sewing machine having its feed stroke adjusting element in the form of a ring nested within and mounted on a supporting ring which in turn is easily and simply attached to the web of the sewing machine frame. This allows the mechanism to be simple and mechanically compact so that movements of force are minimized and work loads imposed on the mechanism by heavy fabric are taken up by large bearing surfaces.

Abstract: A sewing machine loop taker support bracket that is adjustable to permit the use of various size loop takers. The loop taker shaft is journalled in one end of the support bracket and is coupled by a timing belt to a lateral stud shaft journalled in the opposite end of the bracket, the stud shaft being driven through bevel gears by the machine bed shaft. Various size loop takers are accommodated by loosening the support bracket from the machine frame and adjusting the bracket about the stud shaft axis until the loop taker is properly positioned.