Abstract: A sewing apparatus displays a stitch pattern and forcibly supplies a thread based on the displayed stitch pattern. The apparatus comprises a sewing mechanism, an automatic thread supply device, a key input unit, a memory, a selector and a display. The sewing mechanism has a sewing section which includes a needle and a looper driven in accordance with a rotation of a main shaft. The automatic thread supply device forcibly carries a needle thread and a looper thread to the sewing section. The key input unit sets lengths per stitch of the needle thread and the looper thread which are to be supplied by the automatic thread supply device to the sewing section. The memory stores a plurality of stitch patterns in correspondence with combinations of the lengths of the threads to be supplied per stitch. The selector selects one of the stitch patterns corresponding to the combination set by the key input unit. The display displays in graphics the stitch pattern selected by the selector.

Abstract: An apparatus for sewing an over-edge stitch to form a butt-seam in sections of carpet or other thick workpieces is provided, wherein an existing over-edge stitching machine has four primary parts removed and replaced with four parts of different designs, the parts being the workpiece guide, the top looper, the top looper pivot arm and the bottom looper. The new workpiece guide forgoes using the attachments employed by the guide it replaces, and is instead soldered or otherwise secured to the existing needle plate, and the new workpiece guide has a finger extension which operates to keep thread loops formed by the stitching components in a loose configuration until substantially no further tension is produced on the thread loops by the stitching components.

Abstract: An overlock sewing machine which is arranged such that a lower thread take-up lever is disposed independently of an upper looper thread take-up lever and that a lower looper thread take-up lever drive mechanism is fabricated independently of an upper thread take-up lever drive mechanism and adapted to connect thereto an adjust means for adjusting the amount of thread fed from the lower looper thread take-up lever.

Abstract: An apparatus and method for creating an overlock or 504 stitch wherein the excess thread chain (65) extending from the sewing machine needles (19) and the hollow chaining (32) to the previously sewn garment part (60) is stretched and is cut by thread chain cutter (70) to create a leading thread chain of predetermined length extending form the sewing machine needle and the hollow chaining tongue. When cut, the thread chain recoils toward the hollow chaining tongue, and a stream of air draws the free end of the thread chain into the hollow chaining tongue. When the next work piece is moved through the sewing area, the thread chain in the hollow chaining tongue is attached to the work piece and is progressively drawn out of the hollow chaining tongue and oversewn in the overlock stitch.

Abstract: An automatic thread supply device for a conventional overlocking sewing machine is disclosed. Each of a needle thread, an upper looper thread and a lower looper thread is supplied to a thread supply roller but the supply is stopped for an optimum period by a thread holder, whereby the supply length of each thread is adjusted. In forming a thread chain, the total supply length of the looper threads is not more than five times of the length of the needle thread, and the smallest length of the above threads is not more than half of the total length of the remaining threads. In this way, a highly expandable thread chain is formed having a good appearance.

Abstract: An overlock sewing machine having a loop spreading member which provides a retracted position and an operative position. In the retracted position, the loop spreading member is moved away from one side of needle hole slots, which one side being positioned farther from an edgeline of a workpiece. In the operative position the loop spreading member is engageable with a chain and the chain is insertable over the outer tongue upon shifting of the chain portion located at its needle side toward a workpiece feed-in side. The sewing machine further includes drive means connected to the loop spreading member for moving the loop spreading member from its retracted position to the operative position prior to a shifting operation of the chain toward the workpiece feed-in side with respect to positions of the needles.

Abstract: A sewing method and apparatus is disclosed for preventing raveling of a cut cloth edge in the making of garments such as slacks and skirts. A pair of sewing machines symmetrically arranged with respect to a cloth feeding line are disposed oppositely to each other. Each sewing machine has an auxiliary guide for contacting the upper surface of a cloth, a cloth edge guide and a cloth stopper. Opposite edges of the cloth are simultaneously and automatically guided along respective sewing lines by the guides and serged by the sewing machines without failure. In operating the pair of sewing machines, another additional sewing machine can be operated to serge other edges of the next cloth.

Abstract: A threading device for threading a lower looper of an overlock sewing machine, an orifice and a slot are formed in an arm of the lower looper, a hook if formed on a rear end of the arm and obliqued from the arm at a sharp angle, a holder is formed on one end of a lever, a thread threaded through the orifice of the arm can be carried by the holder toward the rear end of the arm, the thread will slip over the hook and located behind the hook when the holder moves beyond the hook, and the thread can be hooked by the hook and received in the slot of the arm when the lever is released.

Abstract: The sewing machine is used for looping or linking floor coverings and is transportable, so that, apart from being used in stationary manner, it can also be moved along the material edge to be looped. It produces a two-thread overcast seam and has a cutting device with a knife (108) for rounding the material corners prior to looping and is automatically started up under the control of a photoelectric cell (117) on approaching a corner.

Abstract: A sewing apparatus for use on a quilting machine having an intermittent tension mechanism and a hopping presser foot mechanism cooperating with eccentric cams located on the main drive shaft of the sewing apparatus.The intermittent tension mechanism includes an eccentric cam having an outer surface adapted to abut a cam follower which engages thread holding tension disks that are biased together by action of a spring. Pressure between the disks is increased during the final tightening of the stitch due to the reciprocating motion of the cam follower.The hopping presser foot mechanism includes a rocking bar pivotally connected at one end to a reciprocating arm and slidingly and pivotally connected at the other end to a presser foot bar. A ball and race mechanism pivotally connects the rocking bar with the reciprocating arm. The arm reciprocates due to action of the eccentric cam.

Abstract: A thread chain guiding device provides a needle-thread-guide plate which extends underneath a throat plate by energizing a solenoid as needed. Thus, the needle-thread-guide plate pushes the needle threads twined around a lower looper outwardly away such that the thread chain is prevented from hanging on an inner chain-off finger when it is rotated counter clockwise. The needle-thread-guide plate is retracted during a normal stitching process by de-energizing the solenoid.

Abstract: This invention provides an overlock sewing machine with a threading mechanism that is both easier and more efficient to use. As shown in FIGS. 1 and 7, the overlock sewing machine has a vertically movable needle (6, 106), a looper carriage (18, 118) connected to a rotating shaft, and a looper (11, 111) on the end of the looper carriage. The looper extends laterally over the looper carriage and has a thread-receiving eye (11a, 111a). The looper and the needle cooperate to form a chain stitch. As shown in FIGS. 3 and 9, a thread-guiding member (25, 125) next to the looper pivots with the looper to guide a thread LT through the thread-receiving eye. A movable lever (30, 130) pivots with or relative to the looper. A thread-delivering member (39, 139) mounted on the movable lever that can be set in two positions: a first position corresponding to a first position of the thread-receiving eye, and a second position corresponding to the thread-guiding member.

Abstract: There is disclosed an overlock sewing machine. The overlock sewing machine includes a looper switching unit for selecting an overlocking operative state or overlocking inoperative state, a needle clamp member having a first needle holding hole in which two needles are mounted separately in the manner that the two needles are positioned in parallel and a second needle holding hole positioned slightly eccentrically at the front side of the cloth feeding direction and perpendicular to the cloth feeding direction, whereby eight types of overlocking operations and one type of double-loop stitching operation can be effected.

Abstract: A composite sewing machine has a lock stitch mechanism and an over-lock stitch mechanism. A switching mechanism is connected to the stitching mechanisms for switching the operation of the sewing machine between a lock stitch operation and an over-lock stitch operation. The machine has a single needle carrying element, a needle position converter for changing the position of the needle carrying element laterally of the stitching direction and including a needle bar connecting stud engaging the needle carrying element and a fulcrum shaft on which the stud is rotatably mounted for pivotal movement to change the vertical orientation of the needle carrying element between a lock stitch position and an over-lock stitch position which are adjacent to each other and juxtaposed laterally on the sewing machine.

Abstract: In this overedge sewing machine, when stitch width is adjusted, an adequate excess thread proportional to the adjusted stitch width is obtained. An overedge stitch can be steadily sewn without excessive stitch tension, even when the stitch width increases. By operating one adjustment member, the position of the lower knife holder and the stitch-support member can be easily adjusted, and the stitch width can thus be easily altered.

Abstract: An overcasting attachment for use with a sewing machine includes a cross thread guide lever driving mechanism for transmitting the movement of a needle bar interlocking mechanism operatively connected to a needle bar of the sewing machine to an upper cross thread guide lever and a lower cross thread guide lever supported by a base plate. The cross thread guide lever driving mechanism operates to synchronize the movement of the lower cross thread guide lever toward a position of engagement with a bobbin thread and the engagement of a lower cross thread with the upper cross thread guide lever.

Abstract: A triple-thread stitch is intended for sewing webs of netting over their edges, wherein one thread (2) forms straight loops (3) and two other threads (4 and 6) form turned loops (5 and 7). In the method of producing this triple-thread stitch, performed in a machine wherein the loop-forming members are the sewing needle (8), looper needle (9) and looper hook (10), the thread (6) of the looper hook (10) is formed into a turned loop (7) which is moved about the needle (8) until the latter's thread (4) forms a turned loop (5), and driven through the straight loop (3) of the thread (2) of the looper needle (9). In the machine for sewing netting webs over their edges with a triple-thread chain stitch, the looper hook (10) is mounted for moving about the needle (8) at the side of the device (17) for advancing the webs, which provides for forming from the thread ( 4) of the needle (8) a turned loop (5) when the looper hook (10) moves the turned loop (7) intermediate the needle (8) and its thread (4).

Abstract: An apparatus for stitching material in a sewing machine having a throat plate having a stitch tongue, a stitch forming instrumentality for forming an overedge stitch having a needle, an upper looper, and a lower looper. The apparatus has first plates for applying tension to a first thread passing to the upper looper, second plates for applying tension to a second thread passing to the needle, third plates for applying tension to a third thread passing to the lower looper, fourth plates for selectively applying tension to the first thread, fifth plates for selectively applying tension to the second thread, and sixth plates for selectively applying tension to the third thread.

Abstract: A looper changeover device for a sewing maching capable of making overlocked stitches is improved by having a manually operable, rotatable selector mechanism for securing and selectively positioning a looper with respect to a looper holder and a looper driving mechanism between a first position and a second position wherein the looper can be moved along separate paths for the selective production of overlocked stitches with one needle and three threads or one needle and two threads. The rotatable selector mechanism can include a rotatable disk or dial supported by the holder and engaging a portion of the looper for positioning and securing the looper in either of the first and second positions.

Abstract: A looper for a sewing machine capable of making overlocked stitches has a unitary distal portion which is operable for the selective production of overlocked stitches with one needle and three threads or one needle and two threads. The unitary distal portion of the looper includes an upper looper portion and a spreader portion. A holder is provided in connection with driving means for supporting the looper, and a positioning arrangement is provided to selectively position the unitary distal portion of the looper in a first position for movement along a first path or in a second position for movement along a second path for the selective production of the stitches.

Abstract: A needle plate for a device adapted to sew a sequence of idle chain stitches has a guide contiguous to a needle locating opening, which guide is adapted to guide the sequence of idle chain stitches so as to pass through the needle location when the free end of the sequence is grasped by a retainer. With such arrangement, the idle chain stitches are sewn by a sewing thread at least at a position where sewing of a cloth starts and are maintained generally inwardly of a hemstitch seam.

Abstract: A zigzag sewing machine capable of forming a plurality of back stitches before or after forming a pattern. When a specific pattern for over-casting is selected and the needle is jogged to a position corresponding to the right end position of the selected pattern, back stitches are formed after the needle has been jogged to the left in response to the operation of a back stitch control member.

Abstract: A thread chain is prevented from hanging at an inner chain-off finger when it is turned back or rotated to the operator's side for holding and cutting. A needle thread, positioned at the front side of a lower looper, is guided by a needle thread restricting device, and a needle thread positioned on the back side of a lower looper is prevented from being hung on an inner chain-off finger by a thread chain guiding device provided at a throat plate so that enfolding back and tacking of the thread chain into the fabric material is performed well.

Abstract: A hook drive for chain stitch sewing machines, in particular for those suited to be hand-held, which comprises an upper hook and a lower hook of curvilinear configuration having a hook holding shank supported obliquely in a box-like case. Each hook is connected to a drive including a gear whereto one end of a swinging yoke is articulated eccentrically which has the opposite end pivoted centrally to a block made rigid with a respective one of said shanks. The two driving gears, one of which is connected to a drive shaft, are in meshing engagement with each other and with a third gear which may drive a movable cutter blade.

Abstract: An overedge sewing machine is adapted to perform three thread overedge stitching (STITCH TYPES 504 and 505) under the cooperating action of one needle (6) and an upper looper (15) and a lower looper (31). In addition to swing movement in the direction crossing the fabric feed direction, reciprocating movement in the fabric feed direction is selectively applied to the lower looper, whereby the front end of the lower looper is revolved around the needle. If the lower looper is revolved around the needle with the upper looper out of action, this operation provides double chain stitching (STITCH TYPE 401). Further, if the lower looper is revolved around the needle with the upper looper in action, this operation provides three thread double chain overedge stitching (STITCH TYPE 601).

Abstract: There is disclosed an overedge width regulating device capable of adjusting overedge width by rotating a knob which causes both a overedge-width latch and a lower knife to move simultaneously. The device permits adjustment of the overedge-width latch independently from the lower knife and the release of the overedge-width latch during the roll hemming process. Thus, without regard to material being sewn, knitted or woven, a tight and well-balanced overedge finish is obtained while, at the same time, the overedging process is greatly improved from the viewpoint of both quality and time.

Abstract: An upper hook structure for use in conjunction with a lower hook and a needle to form overedge stitches, in which the hook has a hole, a tip curved in the direction of the lower hook and a shoulder formed in a middle position on the upper hook to stop and guide the thread of the lower hook.

Abstract: An upper looper for a three thread overedge stitch machine having a hole in its end and having a tip which is curved toward a lower looper to facilitate transfer of the thread of the lower looper onto the upper looper.

Abstract: An improved modular sewing machine which has a base unit including a lower horizontal unit and a vertical upright unit to which can be attached demountable upper and lower stitching instrumentalities, the mounting surfaces of the stitching instrumentalities being substantially coplanar.

Abstract: Multiple hem stitches are produced for joining a plurality of superimposed fabric materials along their edges by employing a sewing machine having a pair of vertically reciprocating needles each carrying a needle thread and a pair of loopers each carrying a looper thread. The first and second needle threads extend along the fabric edge and in parallel with each other on the upper face of the fabrics and penetrate through the fabrics to form a first and second needle thread loops on the underside of the fabrics. The first needle thread loop is distended laterally to the fabric edge by the first looper. The first looper thread encompasses the first needle thread at each penetration point and extends laterally on the upper face of the fabrics to form a first looper thread loop which is caught by the descending first needle to be interlocked with the first needle thread loop along the fabric edge.

Abstract: An overlock sewing machine having a dial and a conversion means for converting the rotary motion of the dial into a linear motion which are associated with a cutter blade holder such that the adjustment of the distance between a stationary claw and a movable claw adjusts the looping width in correspondence with the linear movement of the cutter blade holder perpendicular to the direction of feed of the cloth caused by rotation of the dial. The movable claw, carried by a movable member, can move between an operative position in which the movable claw is positioned next to the side of the stationary claw and an inoperative position spaced away from the side of the stationary claw. The position at which the cutter blade holder is supported on the machine body is offset from the position at which the upper and lower cutting blades make contact.

Abstract: The present invention relates to an attachment for a sewing machine, and more particularly to an overcasting attachment for use with a lockstitch sewing machine which is prepared for straight stitching, wherein needle-like thread guide pieces are provided for passing an additionally prepared thread or threads from sideways around the needle point at a suitable time, making use of the vertical reciprocating movement of the needle, so as to engage the thread or threads with the sewing machine threads for straight stitching.

Abstract: In a sewing machine for performing twin overedging and seaming in one high-speed operation, specially designed top and bottom variable feed dogs pull the two plies through a three needle stitching area with improved, simplified elements for diverting one ply edge while the other is being overcast. The upright overcast edge of the top ply passes through a tunnel formed through the top feed dog. A guide wall attached to the throat plate guides the top edge away from the bottom overedging station. A guard wall can be attached to the presser foot to keep the turned-up top edge away from the seaming needle. A fiber optic/pneumatic system controls automatic stop, presser foot/top feed retraction and between-work thread cutter functions. Alternative front edge guides facilitate feeding the two plies in registration.

Abstract: An improved device for changing the trajectory of the upper looper in an overlocking stitching machine in which the looper carrying rod slides in a cylindrical element contained within a support body having support means located at different distances from the rocking axis of the cylindrical element so that the position of support body can be reversed to change the path of the looper trajectory.

Abstract: A method and a device for the formation of an overcast seam using a zigzag sewing machine are disclosed. After the formation of a first loop in an overstitch position of the needle bar, the needle bar, while the needle thread is slackened and the fabric is moved by one stitch length, changes to a second overstitch position in which another thread loop is made. Thereupon, the needle thread, leading from the first to the second thread loop, is pulled out to form a loop in the first overstitch position while the fabric is fed by another stitch length, the loop being offered to the needle for the stitching and released after stitching. The oversew mandrel of the device for implementing the method includes a double lever loop stripper. One arm of the double lever supplements the oversew mandrel and serves as the thread loop stripper. The other arm has a slide surface which projects into the path of motion of the needle fastening screw in the first overstitch position of the needle bar.

Abstract: The output centerpoint of a Cardan gear mechanism is connected via a ball and a pin slideable therethrough to a lever which in turn carries a looper. Because the major axis of the lever and the axis swept out by the output centerpoint are skewed the lever is reciprocated back and forth along its own major axis while being rotated therearound. This results in the looper being swept back and forth along part of a generally helical-like path.

Abstract: A combination of a thread carrying upper looper and a thread carrying lower looper which along with a thread carrying needle cooperate together in an overedge industrial sewing machine in which the thread carrying upper looper has its thread carrying groove located closer to the bottom edge of the blade face than to the upper edge of the blade face and has its point located above the thread carrying groove and is closer to the upper edge than to the lower edge. The blade of the thread carrying lower looper has a generally flat bottom surface having a 2.degree. rise starting 3/8" from its point and extending to the point.

Abstract: A machine body of -shape as viewed in front is formed of a bed, an arm frame laterally disposed above the bed, and an upright support uprightly extended from the bed and supporting one end of the arm frame at an upper end thereof. An upper mechanism of a locking stitching sewing mechanism is disposed in the free end of the arm frame and a lower mechanism of the lockstitching sewing mechanism is disposed below the upper mechanism within the bed so that cloth may be subjected to lockstitching by these mechanisms. An overedge stitching mechanism is provided in a recess within the -shaped body in order to apply overedge to the edge of the cloth.

Abstract: A method for the formation of an overcast seam by means of a zig-zag sewing machine. After the formation of the first looping of needle and looper thread in a first overstitch position of a needle bar the needle thread is loosened and the needle bar moves into a second overstitch position, in which a further thread looping takes place. After the formation of at least one straight stitch in the second overstitch position, the joining thread between the first two thread looping is drawn out, forming a loop in the first overstitch position, the needle pierces into the loop, after which it is released. The seam thus formed is a firm joining seam by which the sewing material is not gathered between the thread loopings.

Abstract: The tip end of the upper looper of an edge stitching sewing machine is adapted to have a different profile by engagement with a pawled looper arm provided on the upper looper itself or on a mounting post of the upper looper. When the pawled looper arm is engaged with the upper looper, the sewing machine performs one-needle two-thread edge stitching, while it performs its original one-needle three-thread edge stitching when the pawled looper arm is detached from the upper looper in a disengaged position.

Abstract: A sewing machine for simultaneously performing hem stitch and blind stitch. The sewing machine comprises a first looper placed above one end of a hem of cloth to be stitched and along the hem reciprocated to cross with a blind needle which is passed through the cloth; and a second looper placed above the hem to be stitched and adapted to move along a loop-like track which resembles the outline of a saddle and syncronizes generally with the reciprocation of said first looper.

Abstract: Trouser-fly pieces are sewn to a continuous slide fastener chain and at the same time are surged along a curved edge. Variable spacing between the surged curved edge and the line or lines of stitches sewing the fly pieces to the fastener chain is made by selective puckering of each fly piece between two sewing mechanisms. The trailing end of each fly piece is lifted during the sewing to permit the positioning of the next fly piece against a stop.

Abstract: A thread control mechanism for an overedge sewing machine uses only the movable driven components of the needle, lower looper, and upper looper, in combination with stationary thread guides, for feeding and controlling the threads used by the machine to form a seam. The lower and upper looper threads, i.e., the threads which pass through the eye of the lower and upper loopers, respectively, are each engaged by movable thread guides carried on the looper carriers for both loopers so that the coordinated movement of the two loopers cooperate to control and feed both looper threads. A needle thread takeup cam mounted on and driven by the needle arm drive shaft cooperates with stationary thread guides to feed and control the needle thread.