Abstract: A thread control device for a chainstitch sewing machine comprises a thread feeder which is moved simultaneously with the stitching needle by the drive means for the stitching needle. The thread feeder is attached in such a manner as to be able to oscillate at a pivot drive which is allocated to a shaft rotatably mounted in the upper arm casing of the sewing machine.

Abstract: A needle thread changing device of a sewing machine, comprises: a first thread end holding section for holding thread end portions of plurality threads respectively drawn from a plurality of spools; a thread cutting section for cutting a thread being currently used while selectively drawn from the first thread end holding section; a second thread end holding section for holding an end portion of the thread of a needle side cut by the thread cutting section; a thread selecting section for selecting a changing thread from the plurality of threads held by the first thread end holding section; a thread end portion moving section for moving an end portion of the thread selected by the thread selecting section to a predetermined knotting position; and a knotting section for connecting the end portion of the thread thus selected to the end portion of the thread currently used held by the second thread end holding section at the knotting position after the thread thus selected has been moved to the predetermined knot

Abstract: An automotive seat assembly comprising a multitude of trim pieces sewn together along their respective edge portions. A continuous first stitching material passes through and between a number of apertures along a trim piece to form a first seam. A continuous second stitching material passes through and between a number of apertures along another trim piece to form a second seam. The first stitching material loops around the second stitching material between the trim pieces to secure the two trim pieces together. A plurality of interwoven first strands form a first cover material and a plurality of interwoven second strands form a second cover material. The first stitching material loops around the interwoven first strands to pull the first cover material against the first seam and cover the apertures in the trim piece. The second stitching material loops around the interwoven second strands to pull the second cover material against the second seam and cover the apertures in the other trim piece.

Abstract: A sewing machine which performs a stitching operation using multiple kinds of threads has: a plurality of thread supplies; a thread selection device which selects and extracts an arbitrary thread from the plural threads supplied from the thread supplies; a stitching needle; and means for nipping a front end portion of the thread extracted by the selection device, and for bringing the front end portion to the needle. The thread extracted and selected by the selection device is brought to the needle while the front end portion is mechanically nipped.

Abstract: A supporting table for spools, comprises a supporting post. A positioning collar is disposed at the lower portion of the supporting post. The positioning collar has a threaded central opening and a raised plateau. A supporting bracket having a central opening is rotationally enveloped onto the raised plateau of the positioning collar. A plurality of spokes and each of the spokes is connected equiangularly to the peripheral of the supporting bracket. The other end of the spoke is provided with a supporting disk and a retaining post in which a spool can be releasably positioned thereof. And a plurality of radial through holes in which a biased spring and a ball are disposed between the supporting collar and the supporting bracket such that the supporting bracket is selectively positioned with respect to the supporting collar. Accordingly, a plurality of spools having different colors and sizes can be disposed on the supporting table for readily use when needed.

Abstract: The invention relates to an embroidery machine for embroidering embroidery fabric (23), particularly for chain stitching and drop stitching. The embroidery machine has an embroidery head (1), located above the embroidery fabric (23), and an embroidery needle (2) is movably supported in the embroidery head (1) in such a way that by means of drive mechanisms, the embroidery needle (2) is movable up and down and is also rotatable about its longitudinal axis. The embroidery machine also has a stitch plate (3), which is located below the embroidery fabric (23) and on which at least some of the embroidery fabric (23) rests during the embroidering. A thread layer (18) is located on the side of the stitch plate (3) remote from the embroidery fabric (23) and guides the embroidery thread (10) for stitching, and by rotation of the thread layer (18) the embroidery thread (10) can be laid around the embroidery needle (2) that has pierced the embroidery fabric (23).

Abstract: An apparatus for clamping an individual thread out of a plurality of threads, which are guided in side-by-side relationship, includes a transport unit with a drivable transport shaft and a rotatable contact pressure shaft. A thread is guided between the shafts. A clamping unit with an abutment and a clamping pin acting thereagainst is used for clamping a respective thread. Between the clamping pin and one of the functional parts of the transport unit, there is an operative connection. Increasing the clamping of a thread in the clamping unit causes an increasing release of the thread in the transport unit and vice-versa. The operative connection can adopt a central position in which the thread is loose both in the transport unit and in the clamping unit.

Abstract: An improved sewing machine, for sewing overlapping materials and making ornamental seams on a single material comprises: a first supplying assembly for supplying a first seaming yarn, arranged under the pieces to be seamed, a second supplying assembly for supplying a second seaming yarn, arranged above the pieces to be seamed, a needle arranged on the top of the seaming region and a needle driving device for driving the needle by a reciprocating movement along a movement axis thereof in order to cause the needle tip to pass through the pieces to be seamed and to engage the first yarn so as to provide a yarn loop traversed by the second yarn, as a seaming stitch is formed. The machine has the main feature that it further comprises a loading device for automatically loading the second yarn, inside a "crochet" of the assembly supplying the second yarn, as well as a cutting device for cutting the second yarn at the end of the second yarn loading operation.

Abstract: A cone and ribbon holding device including a base portion. A pair of cone holders are secured to the base portion. A pair of thread guides are secured to the base portion. The pair of thread guides are positioned intermediate the pair of cone holders. A ribbon guide is secured to the base portion adjacent to an end portion thereof. The ribbon guide is adapted for receipt of a roll of ribbon thereon.

Abstract: A looper device includes a rod slidably supported in a sewing machine and allowed to move up and down. A looper is secured on the upper end of the rod and includes a hole formed in the front end and includes a support formed on the rear portion. A lever is coupled to the support at a pivot shaft and includes an extension extended from the front end for engaging with the front end of the looper and forming a shoulder which may engage with and may feed a thread upward. The lever includes a member for positioning the lever relative to the looper.

Abstract: A non-suspension type thread feeder including a rack post fixedly secured to a part of a sewing machine, a hollow, truncated, split cone revolvably and vertically adjustably mounted on the rack post to hold a spool of thread, the hollow, truncated, split cone being synchronously turned with the spool of thread when the thread of the spool of thread is pulled.

Abstract: A sewing machine includes a plurality of bobbins, thread guiding device, thread selecting device, a needle having an eye, a thread take-up lever having a thread receiving hole, thread taking-out device, movable thread hooking device, and thread letting-through device. The thread guiding device delivers a plurality of threads from the bobbins. The thread selecting device selects one of the threads. The thread taking-out device brings the selected thread adjacent to the eye of the thread. Simultaneously with the thread taking-out action of the thread taking-out device, the movable thread hooking device and the thread letting-through device co-operatively let the selected thread, being disposed between the thread take-up lever and the needle, pass through the thread receiving hole of the thread take-up lever via an opening of the thread receiving hole, and let the leading end of the selected thread pass through the eye of the needle.

Abstract: A thread take-up lever guard in a multi-needle sewing machine provided with a support disposed on the front surface of a head, a plurality of needle bars each having a needle attached to the lower end, and a plurality of thread take-up levers disposed to oppose the needle bars respectively and protruded from the support to be able to oscillate vertically. The thread take-up lever guard prevents a needle thread carried on a selected thread take-up lever from being caught by an adjacent thread take-up lever assuming a standing posture or is tangled with another needle thread carried on the standing thread take-up lever. The thread take-up lever guard comprises a separator disposed on the support such that every adjacent two thread take-up levers may be isolated from each other over a predetermined range of routes along which the take-up levers reciprocate.

Abstract: A miniature electric sewing machine includes a shaft support bracket mounted on one side of a casing, a rotatable shaft supported on the shaft support bracket for rotation so as to extend in parallel with the side surface of the casing, a spindle support arm fixed to the rotatable shaft, and a bobbin winder spindle fixed to a distal end of the spindle support arm so as to extend in parallel with the rotatable shaft. The spindle support arm has a length of 35 mm or more. The spindle support arm fixed to the rotatable shaft assumes a position where it is normal to the side face of the casing or another position where the bobbin winder spindle fixed to the distal end of the arm is directed obliquely downwardly. A stopper is formed on the spindle support arm to be abutted against the side face of the casing when the arm is normal to the casing side face, preventing further upward rotating movement of the arm from the normal position.

Abstract: Thread guide devices capable of easily and quickly performing a threading operation with an excellent operability, whereby a thread is hardly come off or entangled, and hence a sewing operation is hardly interrupted when the thread is come off or entangled, leading to an excellent sewing operating performance. Each thread guide device of sewing machine includes a thread guide member disposed between a thread spool and a tension device respectively provided on a body for guiding a thread from the thread spool, and the thread guide member comprises a base end portion attached to one end of a thread guide groove portion which is opened at an upper end of the body, a tip end portion having an inclination portion which is elastically brought into contact with a rear side wall of the body at a front surface of the inclination portion, and a thread accommodation space which is defined in a lower end portion of the thread guide groove portion.

Abstract: A needle receiving assembly for a sewing machine comprising a throat plate through which a sewing needle can pass and a needle collar for regulating a rear loop of an upper thread passing through the sewing needle. The position of the needle collar relative to the sewing needle is adjustable.

Abstract: A sewing machine is provided for splicing together two different threads. The machine includes a thread tree with a number of thread spools with each thread thereof being inserted through flexible plastic tubing. A movable carriage assembly locates the new thread to be spliced relative to a splicing device passageway that receives the new thread to be spliced along with the old thread. The splicing device includes a front air inlet for drawing the new thread into the passageway of the splicing device and a rear air inlet for creating air turbulence during the splicing operation. Also used in moving the new thread through the passageway is an insertion drive roller connected to a pivotal rocker. A thread clamp cover connected to the rocker cooperates with the trimmer blades to trim the old thread. A thread clamp and a thread clamp magnet cooperate to hold the old thread in a desired position during the insertion of the new thread into the splicing device.

Abstract: An under thread supply apparatus for a sewing machine comprises a bobbin case, a bobbin exchange device, a thread removal device and a winding device. The bobbin case is removably set to a shuttle of the sewing machine and accommodates a bobbin with the thread wound thereon. The bobbin exchange device takes the bobbin case out of the shuttle, and sets the bobbin case accommodating the bobbin with the thread wound anew therearound to the shuttle. The thread removal device removes the thread from the bobbin accommodated in the bobbin case which is taken out. The winding device winds a preset amount of thread around the bobbin after the thread is removed therefrom.

Abstract: A thread guide holder device comprises a thread guide holder which is mounted on a spool stand base and has thread guides each for guiding a thread therethrough, wherein the thread guide holder is mounted on the spool stand base by way of damping materials. As a result, it is possible to restrain the oscillation of the thread guide holder during sewing operation so as to smoothly draw out the threads through the thread guides of the thread guide holder and consequently prevent irregular stitches and restrain an eye-offensive oscillation of the thread guide holder.

Abstract: The present invention provides a looper thread paying-out apparatus of sewing machine in which apparatus a variation of paying-out tension of the thread from a bobbin does not affect a seam.Just before a thread tensioner of a looper system which feeds a looper thread from a bobbin of sewing machine through to thread tensioner, an auxiliary paying-out apparatus is provided for paying out previously a portion of thread for a length of one stitch corresponding to an amount of horizontal cloth feed and feeding that portion into the thread tensioner at zero tension.

Abstract: A thread spreading apparatus for use in an overlock sewing machine capable of performing over-edge chain stitching and other stitching. The thread spreading apparatus uses a lower looper for over-edge chain stitching to allow a needle to surely drop into a triangle defined by a needle thread, a looper thread and the lower looper, thereby enabling multi-thread chain stitching and covering chain stitching to be performed without fail. The apparatus includes a thread spreading hook having hook portions with different heights for retaining needle threads and a projection formed on one of the hook portions. During stitching other than over-edge chain stitching, the hook portions of the thread spreading hook retain the needle threads when two needles drop, thereby allowing each needle to drop into a triangle defined by the looper thread, the lower looper and the corresponding needle thread.

Abstract: A new thread control mechanism including a second movable needle thread control secured to the upper end of the needle bar from which the thread extends to the needles, a first movable needle thread control eyelet operatively connected to the needle bar such that it reciprocates vertically in synchrony with the first movable needle thread control, and stationary needle thread eyelets adjustably mounted on the exterior of the sewing machine through which needle thread extends to said first movable needle thread eyelets.

Abstract: A sewing machine is comprised of a bed, an arm having a vertical portion set upright on the bed, and a horizontal portion horizontally extending from the upper end of the vertical portion, an arm shaft extended within and journaled on the arm, a sewing head detachably joined to the extremity of the arm, a needle bar incorporated into the sewing head, supported so as to be driven for vertical reciprocation on the sewing head by the arm shaft, and capable of being removed from the arm together with the sewing head, a motion converting means detachably connected with the needle bar to convert the rotation of the arm shaft into the reciprocation of the needle bar, a needle thread feed device disposed on the sewing head to feed a needle thread to a needle attached to the lower end of the needle bar, and a thread takeup device disposed on the arm and capable of operating in synchronism with the vertical reciprocation of the needle bar to draw up the slack needle thread and of releasing the needle thread.

Abstract: A dry sewing machine, or a sewing machine which can be operated without oiling. The machine of the preferred embodiment is particularly adapted for making a type 401 two thread chain stitch, used in commercial sewing operations. In addition to employing sealed bearings, novel spreader and rocker frame assemblies are employed.

Abstract: A needle bar thread guide device for a sewing machine comprises a needle bar thread guide which is fixed to the lower end portion of the needle bar of the sewing machine and has a thread retaining portion therein for guiding the needle thread and an auxiliary thread guide which is mounted on the needle bar above the needle bar thread guide in such a way as to be adjustable in its vertical position and has a threading hole therein for passing the needle thread therethrough so as to apply a frictional force to the needle thread by contacting the needle thread at the rim thereof, characterized in that the retaining point of the thread retaining portion and the contact point of the threading hole are shifted from each other in a plan view.

Abstract: A thread feeding device for use with multiple needles of a sewing machine wherein the thread feeding device includes an array of guide channels which have first openings at one end for receiving threads from supply spools and second openings at the remaining end for dispensing the threads to a sewing machine. A support plate provides a base for attachment of the guide channels above the sewing machine with the second openings oriented toward the user. The thread feeding device includes a strip of hook and loop fasteners such as VELCRO.TM., spring element or other member for retaining ends of the threads exiting the second opening such that the threads remain accessible for ready grasp of the user. Also disclosed is a method of feeding thread to a sewing machine, including the step of affixing loose ends of the threads at the VELCRO.TM.

Abstract: A looper thread guiding mechanism for facilitating setting of the looper thread to a double loop looper. A drum is rotatably provided at a side portion of the looper having a thread hole at a tip end portion thereof. A thread hooking portion is slidably movably provided along the looper. The thread hooking portion is connected to the drum by a resilient linking member. By angular rotation of the drum in one direction, the thread hooking portion is positioned adjacent the thread hole for facilitating the thread setting. By angular rotation of the drum in an opposite direction, the linking member is partially wound over the drum, and the thread hooking portion is moved toward a base portion of the looper.

Abstract: An apparatus and a method for supplying thread in a chain stitch sewing machine are disclosed, the apparatus comprising a needle vertically reciprocating between a top end point and a bottom end point in one sewing cycle; a looper horizontally reciprocating in one sewing cycle; a thread supply device for forcibly supplying a needle thread to the needle; and a thread supply control device for controlling the thread supply device so that the needle thread is supplied in at least two periods in each sewing cycle, the periods being discontinuous.

Abstract: A looper mechanism for use in a sewing machine which includes a needle moved substantially vertically through a needle plate while inclined in a feed direction of cloth. The looper mechanism includes a lower looper which performs an arcuate reciprocating motion crosswise to the locus of the needle at the lower side of the needle plate, and an upper looper which performs an elliptically-arcuate reciprocating motion crosswise to the locus of the lower looper at the side of the needle plate and crosswise to the locus of the needle at the upper side of the needle. A needle thread which is passed through the needle, an lower-looper thread passed through the lower looper and an upper-looper thread passed through the upper looper being cross with one another to perform sewing. At least one of the upper looper and the lower looper has a hollow structure through which a looper thread is passed from a thread inlet of the looper to a tapered thread outlet.

Abstract: A thread processing machine, in particular an embroidering machine, is provided with a thread joining device, which has a whirl chamber and a compressed air nozzle, in which two threads of different color, one used after the other, are joined together by compressed air vortex connection of their filaments, after which they are drawn through the needle.

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: A yarn feed roller assembly for a tufting machine for selectively controlling the speed at which yarn is fed to each needle of the tufting machine so that different pile heights may be produced by each needle. The assembly has a pivotable control arm corresponding to each needle and carrying a pair of narrow width feed rollers. Each control arm is a thin plate so as to reduce the amount of space required and to permit each needle to be individually controlled. Each feed roller associated with an arm correponds to a different pile height and is adapted to engage and be driven by a corresponding drive roller rotatably driven from the tufting machine at a different speed from each other drive roller. A yarn strand directed to a corresponding needle is first guided between the drive rollers and the feed rollers of the control arm. Each control arm may be pivoted about a fulcrum to engage a selected feed roller with its corresponding drive roller to feed the yarn to the needles at a corresponding speed.

Abstract: In a thread supply device used in a sewing apparatus having a plurality of needles and a looper mechanism, needle threads guided to the needles and a looper thread guided to the looper are cut by a thread cutting unit at a cutting position, which is off a thread supply path, after a sewing operation is finished but before the following sewing operation starts. The thread supply device comprises a supply mechanism, a stopping mechanism, a memory and a control unit. The supply mechanism forcibly supplies the needle threads and the looper thread. The stopping mechanism stops the threads from being supplied. The memory stores an extra length of each thread, which is required for a cutting operation. The control unit reads out the extra length from the memory and controls the supply mechanism and the stopping mechanism so that each thread is supplied in the extra length.

Abstract: A pattern sewing machine provided with a thread trimmer and a thread delivery unit. After a series of patterns is completed and the thread trimmer trims thread, the thread delivery unit is prohibited from delivering thread until the next sewing operation starts to form another pattern. When the patterns are distant from each other, a needle bar is disconnected and fabric is fed a distance in a non sewing operation. No excess thread is delivered corresponding to the feeding distance of the fabric, thus preventing thread from being wasted. Furthermore, an operator can avoid the cutting of excess thread with scissors. The sewing efficiency is thus enhanced. In the pattern sewing machine the crossover thread connecting the patterns is automatically cut regardless of the distance between the patterns.

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: A sewing machine including an automatic thread taking-up operation which comprises an arm of a thread take-up projecting beyond a thread holding member, a needle thread carrying member for introducing the needle thread into the thread holding member when the thread take-up swings toward one end of a thread guide, a pathway for the needle thread formed in the thread holding member, a blocking member for preventing the needle thread from slipping out of the thread holding member, and a crossing member for helping the needle thread carried beyond the thread taking-up member to cross the thread guide. The sewing machine can easily perform thread taking-up operation and threading operation while the thread take-up swings vertically.

Abstract: In a sewing machine, a thread-draw lever is driven in an oscillating movement, in synchronism with a needle bar, and carries a gripping hook for the thread, the thread being brought within reach of this hook by passing it into a longitudinal channel formed on an upper face of an upper arm of the casing of the machine.The arrangement permits the threading operation in a sewing machine to take place by simple insertion of the thread into the channel, without having to pass the thread through eyelets.

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 ore 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 amount of a lower thread to be supplied from a bobbin in each stitch forming operation is first determined on a theoretical basis in accordance with the stitch control data stored in a pattern memory. The sewing machine is provided with a bobbin rotation detector which detects every rotation of the bobbin to estimate a lower thread amount which has actually been supplied from the bobbin. A control unit compares the theoretical amount and the practical amount to lead out a correction coefficient which will be applied to the theoretical amount for the next stitch forming operation.

Abstract: An upper thread carried by a vertically reciprocating needle is drawn from a bobbin through a tensioning device, a supply device and a take-up lever. A predetermined amount of the upper thread is first supplied by actuating the supply device, while applying no tension thereto. An additional amount of the upper thread is then supplied by operation of the take-up lever with a predetermined tension being given thereto. The additional amount is detected by a sensor. The supply device includes a one-way clutch for allowing the upper thread to travel in a predetermined direction which, however, may not be conveyed from the needle side when the supply device is made operative. A CPU controls the amount of thread first supplied by the supply device which will always be smaller than an amount actually required for producing a stitch, resulting in an additional amount to be supplied supplemental in cooperation with the tensioning device.

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 slackened needle thread assuring unit includes a thread tension member mounted on a side wall of a frame secured to the bed of a sewing machine. A thread takeup is positioned above the thread tension member. A needle/bobbin thread cutter is positioned apart from and under the frame for cutting a needle thread. A thread end holder holds an end of the thread to be cut by the needle/bobbin thread cutter. A thread guide extending across the front portion of the frame has one end supported by a support plate and the other free end defining a hook. A drive mechanism supported by the support plate reciprocally moves the hook in the direction substantially perpendicular to the threading direction of the needle thread.

Abstract: A needle thread feeding assembly in which the thread is positively fed at a desired stitch pitch while being clamped in between a presser roller and a drive roller, whose rotation is frictionally transmitted from a drive source. An encoder detects a predetermined amount of rotation and signals to restrict the drive roller, while allowing the drive shaft to continue rotating. A main-shaft-angle-detector detects predetermined angles adapted to operate the required stitch pitch and to start counting of pulses at the encoder. When a required number of pulses corresponding to the stitch-pitch is counted, the encoder signals to restrict the drive roller. Thus, the needle thread is positively and intermittently fed according to the stitch pitch.

Abstract: A thread end guide groove communicating with a needle location groove is defined in a cloth presser foot. A knife is secured to the rear surface of the cloth presser foot and extends across the thread end guide groove. A needle thread restriction plate is provided on the cloth presser foot and open at the side of a thread end holder. The needle thread restriction plate covers the upper surface of the thread end guide groove so that an inclined angle .theta.1 defined between an inclined portion of the needle thread restriction plate and a sewn material is set to be greater than an inclination angle .theta.2 defined between the extension thread and the sewn material.

Abstract: A method of supplying a thread to a sewing machine from a reel wherein the thread is supplied by carrying on a hanger a loop produced between the reel and the sewing machine by twisting the thread two to three times. The hanger used in supplying the thread comprises a case body, a cylindrical dial partly exposed on the surface of the case body, and a hook projecting from the case body to catch the thread. The hook is coupled through gearing to the dial and is rotatable in response to rotation of the dial.

Abstract: A sewing machine includes a timing pulse generator, a thread feeding device, thread sensor, and microcomputer. The timing pulse generator generates a timing pulse when a main shaft is rotated by a predetermined rotational increment by a main motor. The thread feeding device feeds out a needle thread toward a needle. The thread sensor is disposed in a path of the needle thread between the thread feeding device and the needle, and generates a thread breakage signal when the needle thread is out of the path. The microcomputer drives the thread feeding device based on the timing signal generated by the timing pulse generator if the thread breakage signal is not generated by the thread sensor. The microcomputer counts the timing pulses after the thread breakage signal has been generated by the thread sensor. The microcomputer stops the main motor when a count value has reached first predetermined value.

Abstract: A relatively long needle (22) is supported at the lower end of a needle bar (28). The needle bar (28) and needle (22) are moved up and down and forwardly and rearwardly. The needle bar (28) and needle (22) are moved forwardly while they are in materials (M) which are being sewed together, to in that manner advance the materials (M) stitch by stitch. The materials (M) are supported on a bed (10) which includes a slot (20) which is elongated in the direction of the stitch path. The needle (22) is received in the slot (22). A side boundary of the slot (20) provides a side guide surface (84) which is contiguous a first side of the needle (22). An upper thread (76) extends downwardly from a thread guide (110) into a side groove (86) in the first side of the needle (22), to and through a needle eye (80). A recess (82) is formed in the second side of the needle (22) above the needle eye (80). Following downward movement of the needle (22) through the materials (M), the needle (22) is moved upwardly.

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: An automatic thread tension control sewing machine comprising thread tension controller for clamping an upper thread with a predetermined pressure to control an amount of the upper thread supplied to a needle and a loop taker, thread tension setting means that determines a pressure with which the thread tension controller clamps the upper thread, upper thread supplying mechanism, a releasing mechanism controlling operation of the upper thread supplying mechanism, and a central processing unit for actuating the releasing mechanism in accordance with a selected stitch pattern.

Abstract: The upper end portion (44) of a needle (10) is received within a blind socket (38) which extends axially upwardly into a lower end portion of a needle bar (12). A set screw (42) is received within a set screw opening (40) which intersects the socket (38). The set screw (42) is tightened to secure the needle (10) to the needle bar (12). The lower end portion of needle bar (12) includes an inclined side surface (24). Side surface (24) truncates the lower end portion of the needle bar (12). A circumferential groove (34) is provided on the remaining part of the lower end portion of needle bar (12), closely adjacent a lower end surface (30). A chamfer (32) is provided at the periphery of the end surface (30). Chamfer (32) functions to cam a snap ring (36) onto the lower end portion of needle bar (12) and into the groove (34). The inclined side surface (24) and a confronting portion of ring (26) defines a thread guide eye (46).