Abstract: An upper decoration mechanism and a sewing machine without requiring an operation of detaching the upper decoration mechanism from the sewing machine without reducing workability even when performing a double chain stitch not using a decoration thread. The upper decoration mechanism provided on a sewing machine includes an expansion retraction mechanism configured to switch a spreader between an expanded state where the spreader cooperates with needles for performing an upper decoration sewing and a retracted state where the spreader is separated from the needles.

Abstract: An apparatus and method for applying stitches to a decorative component having a three dimensional configuration is provided. The apparatus having a head with a needle bar assembly operatively coupled to the head; a looper configured to cooperate with the needle bar assembly in order to provide a plurality of stitches in the decorative component, the looper rotating in a plane parallel to the decorative component; and a post assembly configured to drive the looper in a reciprocating fashion in the plane, wherein the post assembly is operatively coupled to a motor configured to drive the needle bar assembly in a reciprocating fashion.

Abstract: In order to prevent a replacement of the needle plate in the situation not suitable for replacing the needle plate, a needle plate detachable mechanism has a needle plate fixing unit capable of being switched between a fixed state where a needle plate is fixed to a sewing machine body and an unfixed state where the fixed state is released; and a switching mechanism which is connected with the needle plate fixing unit for switching the needle plate fixing unit between the fixed state and the unfixed state, wherein the needle plate fixing unit is prevented from being switched when the needle is positioned below an upper surface of the needle plate or when the sewing machine motor is driven.

Abstract: An electrical connector includes a housing including a receiving portion for inserting a flat conductive member; a plurality of terminals arranged in a terminal arrangement direction; a movable member; and a fixing metal member. The movable member includes a supported portion and an engaging portion. The supported portion is supported on the housing to be movable between an open position and a closed position. The engaging portion engages with the flat conductive member when the movable member is situated at the closed position. The fixing metal member includes a fixing portion to be fixed to an electrical circuit board; a regulating portion for restricting the movable member; and an engaging section for engaging with the movable member. The fixing metal member includes leg portions extending toward the electrical circuit board. The fixing portion, the regulating portion, and the engaging portion are disposed on the leg portions.

Abstract: A overlock sewing machine includes a switch limiting arm rockable integrally with a main shaft fixing operating arm and an arm including arms which are actuated by operating a threading switching knob to engage with the switch limiting arm to rock a rocking lever portion and being engageable with a slide plate to move the position of the slide plate to a sewing executable position upon operating the threading switching knob to the sewing executing position side.

Abstract: A sewing machine with a threading and air supply selecting device includes a base with a main shaft for driving at least one thread wiper, and a guiding pipe is provided on the thread wiper. On the base is further disposed an air supply device driven by a drive force source. Between the air supply source and he guiding pipe is disposed a pipe-moving device for moving the connecting pipe to the guiding pipe. A swing arm of a connecting rod assembly serves to control ON and Off of the air supply source. A directional positioning device is used to stop the main shaft from rotation, when the air supply source is working.

Abstract: An overlock sewing machine includes a main shaft fixing operating arm provided with a shaft pin engaging portion that engages with a fixing inner shaft pin and an arm provided to be operable by a user which are integrally rockable within a specified range, and further includes a main shaft fixing operating spring which urging direction is switched in both directions of an rocking direction by exceeding a neutral point by the rocking movements of the main shaft operating arm and the arm.

Abstract: A sewing machine with a drive-selection device capable of positioning an upper thread wiper when in a non-drive position, the drive-selection device includes a moving member movably disposed on the pivot, an actuator for moving the moving member, and a pulling member for moving the actuator. The actuator is pivoted to the base and has one end provided with an actuating end, at the actuating end is provided an actuating protrusion which engages with and moves the actuating portion, another end of the actuator is formed with an engaging portion which is pushed against by the pulling member. The pulling member is pivoted to the base and has one side provided with a push portion which protrudes toward the engaging portion, and the pulling member is further provided with a fixing portion. An elastic member is disposed between the fixing portion and the actuating portion.

Abstract: A sewing machine of an “overlook” “cut-and-sew” type for sewing together at least two flaps (3a, 3b) of textile that are overlapping and belonging to one or more textile articles, comprising at least a needle plate (2) suitable for supporting at least two overlapping flaps (3a, 3b) of textile of one or more textile articles which are sliding for forming sewing stitches (10a, 10b, 10c), the needle plate (2) being provided with through-openings defining respective seatings (4) for passage of sewing needles (5) and at least a lateral appendage (6) defining a sliding line (7) for the sewing stitches (10a, 10b, 10c); a lower crochet hook (14); an upper crochet hook (15); and at least a sewing needle bearing device (11) with at least three sewing needles (5) mounted on the device (11), reciprocally flanked, aligned to one another and supplied with respective sewing threads (10), and being suitable for passing through the seatings (4) of the needle plate (2) for sewing the over-lapping flaps (3a, 3b) of textile, the

Abstract: A threading to a looper is performed with one-touch operation. A looper threading/sewing changeover mechanism 30 including a push button 33 for a pressing operation of a push button shaft 32 that a control pin 31 is protruded and provided, a control groove cam 38 which includes a first control groove cam portion 34—a fourth control groove cam portion 37 which receive the control pin, a connecting movement plate 40 which supports a thread guide portion and which is elastically repelled toward a threading state that a thread guide outlet of the thread guide portion contacts to a looper thread inlet of the looper by a first spring 39, and a connecting positioning plate 82 which rotates together with a main shaft 2 integrally and has a peripheral surface 80 that a tip portion 41 of the push button shaft contacts and has a notch portion 81 that the tip portion of the push button shaft is fitted is provided.

Abstract: A motor pulley for an overlock sewing machine is provided. The motor pulley includes a frame which forms a body of the pulley, and a plurality of ribs which are integrally formed with the frame. Each rib is oriented in a radial direction at a predetermined angle displaced from an axial center line of the pulley. The motor pulley further includes a ramp which is formed on one side surface of each of the ribs, and a slot which is formed in the pulley so that outside air can enter the motor pulley. The motor pulley of the present invention increases the flow rate of air that is blown from the pulley to a motor of the overlock sewing machine. Furthermore, the path of air flow of the motor pulley is improved, thus reducing a loss of air flow and increasing the flow rate of air.

Abstract: An upper looper driving device of a sewing machine is provided. The device includes an upper looper driving shaft which is rotatable around an axis thereof, an upper looper holder having an upper end portion at which the upper looper is held, an upper looper swinging arm having one end portion supported by the upper looper driving shaft such that a position of the upper looper swinging arm is adjustable along an axial direction of the upper looper driving shaft and the other end portion to which the upper looper holder is rotatably coupled, and an upper looper guide slidably holding the upper looper holder. The upper looper guide is supported by a frame of the sewing machine such that a position of the upper looper guide is adjustable along a direction parallel to the axial direction of the upper looper driving shaft.

Abstract: An overlock sewing machine includes: a main body; a needle bar mounted to reciprocate in an axial direction; plural needles positioned at the needle bar; a main feeding mechanism adjusted to control a cloth feeding amount of a main feed dog; a differential feeding mechanism adjusted to control a cloth feeding amount of a differential feed dog; a memorizing device configured to memorize at least one sewing pattern, the memorizing device being provided at the main body; a pattern selecting device provided at the main body and configured to select the at least one sewing pattern memorized in the memorizing device; and a control device provided at the main body and configured to control the selected at least one sewing pattern.

Abstract: An overlock sewing machine includes: a main body; a needle bar mounted to reciprocate in an axial direction; plural needles positioned at the needle bar; a main feeding mechanism adjusted to control a cloth feeding amount of a main feed dog; a differential feeding mechanism adjusted to control a cloth feeding amount of a differential feed dog; a memorizing device configured to memorize at least one sewing pattern, the memorizing device being provided at the main body; a pattern selecting device provided at the main body and configured to select the at least one sewing pattern memorized in the memorizing device; and a control device provided at the main body and configured to control the selected at least one sewing pattern.

Abstract: A fabric guide device for a sewing machine has an upper plate and a middle plate, and is disposed at the fabric feed side of the presser foot of the sewing machine. The upper plate is disposed on the sewing machine bed in a state of keeping a certain clearance from the sewing machine bed, and its fabric feed side portion is warped upward. The middle plate is disposed beneath said warped portion of the upper plate, and is free to project and retreat from and into the sewing machine bed. The middle plate has upper and lower surfaces for guiding the upper and lower bodies. When sewing said bodies together, first the middle plate projects from the sewing machine bed to insert between the bodies. Then the bodies are pulled forward, and the over-edge chain stitching portions are engaged with the middle plate to be tilted to the fabric feed side.

Abstract: A two-needle overlock sewing machine comprises a throat plate and a middle tongue. The throat plate has an opening needle hole and an outer tongue. The middle tongue is disposed parallel to the outer tongue, a thread chain is formed so as to envelop both tongues. The presser foot is disposed so as to press the cloth to the throat plate by a spring. A push-up lever lifts up the presser foot by handling. The push-up lever and the middle tongue are coupled together by a transmission mechanism. By raising the presser foot by manipulation of the push-up lever at the finish of sewing operation, the middle tongue draws back simultaneously and retreats from the needle hole. As a result, the manipulation for drawing back the middle tongue during the process of thread chain handling is not needed, and the operation is simplified.

Abstract: The over lock sewing machine for forming seams of an over-edge chain stitch and a double-thread chain stitch on a work cloth is provided with a needle bar holding a plurality of needles for forming a seam by a vertical reciprocating movement a plurality of loopers and a needle bar transmitting mechanism moving the needle bar in approximately orthogonal direction relative to a cloth feeding direction of the work cloth and the vertical reciprocating direction of the needle bar. Accordingly, the over lock sewing machine can make various decorative stitches with an over-edge chain stitch function and a zigzag stitch function. Moreover, the over lock sewing machine is capable with operation at a low cost.

Abstract: A two-needle overlock sewing machine comprises a throat plate and a middle tongue. The throat plate has an opening needle hole and an outer tongue. The middle tongue is disposed parallel to the outer tongue, a thread chain is formed so as to envelop both tongues. The presser foot is disposed so as to press the cloth to the throat plate by a spring. A push-up lever lifts up the presser foot by handling. The push-up lever and the middle tongue are coupled together by a transmission mechanism. By raising the presser foot by manipulation of the push-up lever at the finish of sewing operation, the middle tongue draws back simultaneously and retreats from the needle hole. As a result, the manipulation for drawing back the middle tongue during the process of thread chain handling is not needed, and the operation is simplified.

Abstract: A device (1) for execution of overcasting seams comprises two needles (3, 4) carrying respective sewing threads, two support arms (6, 9) on each of which two lower (7, 8) and upper (10, 11) loopers respectively, are mounted. The loopers of each support arm (6, 9) interact with the loopers of the other arm (6, 9) and with the needles (3, 4) to form a first and a second overcasting seam portions superposed on each other. The invention also relates to a method to be put into practice by such a device (1), a needle plate to be installed on such a device (1) and a seam consequently obtainable therewith.

Abstract: The equipment comprises in combination: a twin needle (15, 17) fed with two needle threads (F1, F2); an upper looper (30) fed with a looper thread (F3), and a lower spreader (31); a throat plate (36) with two slots (38, 40) for the needles (15, 17) and the stitch finger (42) on the line of the cut (T) of increased width (D); and a thread-pulling arm (25) for pulling off an increased amount of the thread (F3) for the looper at each angular stroke.

Abstract: A woven tape or label having fiber molten parts generated on both side edges thereof is provided with a tape body and two lines of chain stitch, each line of the chain stitch having a large number of loops formed with one sewing thread, and thus each of the fiber molten parts is wrapped in the chain stitch of one sewing thread. The chain stitch prevents the fiber molten parts from projecting when the tape or label is bent and sewn on an article of clothing. If desired, the label can contain shrinkable yarns interwoven partially as weft yarns in portion thereof applicable as one or two bent places at sewing.

Abstract: An over-lock sewing machine executing an over-edge chain stitch and a double-chain stitch includes a sewing machine motor for driving a needle bar so that the needle bar is moved upward and downward, a sewing needle mounted on a lower end of the needle bar, an upper looper and a lower looper forming stitches in cooperation with the sewing needle, and a stepping motor for driving the lower looper so that the lower looper is rocked.

Abstract: An overlock sewing machine has a movable cutter which is activated in association with rotation of a main drive shaft to cooperate with a fixed cutter provided in the same plane with an upper surface of a needle plate, to thereby cut a work while the work is being stitched. A link mechanism includes a drive link having one end rotatably connected to a mount and the other end is connected to the movable cutter and a swingable link having an arcuate guide groove extending between one end and a center axis thereof around which the swingable link is swingingly moved. The drive link has a point between opposite ends thereof operatively connected to the arcuate guide groove of the swingable link. An operating device includes an operating shaft which is operatively connected to the point of the drive shaft so that the point of the drive link may be substantially moved along the arcuate guide groove of the swingable link between said one end and center axis thereof by manipulation of an operating knob.

Abstract: A overedge sewing machine comprises: drive mechanisms for selectively carrying out a hemstitch sewing operation and flat stitch and double-chain stitch sewing operations; a needle plate having a stitch finger, a guide needle piece and a stitch tongue reciprocatable between an operation position and a non-operation position outside the needle plate claw and guide needle; and three needles mounted removably thereon in such a manner that the three needles are arranged in parallel to each other substantially on a straight line, wherein a needle point which is used in common with the overedge sewing operation and the flat stitch and double-chain stitch sewing operations is positioned between the stitch tongue and the guide needle piece respectively provided in the needle plate.

Abstract: An upper decorative stitching spreader 11 is switched active or inactive by an upper decoration switching mechanism 25. By placing the spreader 11 in active state, upper decorative stitches which are formed from above the fabric are added to the conventional over-edge chain stitches and lower decorative stitches which are formed from below the fabric. On the other hand, by placing the spreader 11 in an inactive state; that is, by stopping the spreader 11, over-edge chain stitching without upper decorative stitching, and lower decorative stitching which is performed from below the fabric are performed without interference with the spreader 11.

Abstract: An overlock sewing machine which can readily form a rolled seam with no requirement for a complicated tension adjusting operation is disclosed. In this overlock sewing machine, an auxiliary thread tensioner (15) is provided independently of a main thread tensioner (4), providing a lower looper thread (9) with thread tension which is necessary for forming an over-edge chain stitch, in the vicinity thereof. An end cam (25) is provided on a shaft (13) of a dial (12) for feed adjustment, so that an upper pawl (23) rams one portion of the peripheral edge of a tension disc (20) and expands a side which is opposed thereto for canceling tension provision to the lower looper thread (9) passed through tension discs and provides the tension only by the main thread tensioner (4) to carry out an ordinary over-edge chain stitch when a lower pawl (24) is engaged with a high lift part of the end cam (25).

Abstract: A right looper release mechanism in an overlock sewing machine is disclosed comprising a vertically movable needle having a needle thread, a right looper disposed under the vertically movable needle and reciprocally movable in a direction crossing the vertically movable needle, a rear driving lever attached to the right looper and engaged in a right looper shaft so as to be freely turned relative thereto, a front driving lever fixed to the right looper shaft, a fixing screw member inserted in a throughhole of the front driving lever so as to be freely turned, said fixing screw member having a male screw being screwed into a female screw 3a of the rear driving lever so as to transmit a motion of the right looper shaft to the rear driving lever by way of the front driving lever, and an elastic member for elastically biasing the fixing screw member in a direction to release the fixing screw member so as to be unscrewed from the female screw of the rear driving lever.

Abstract: A skin foam-in-place skin material is prepared by stitching a plurality of skin forming pieces into a predetermined shape. End edges of the skin forming pieces made of moquette skin are overlapped one upon another. The overlapped portion is joined together by over-lock stitches at a stitching pitch ranging from 1.5 to 3.0 mm using a single needle and three threads along the end edge.

Abstract: An overlock sewing machine which can switch its operation from an ordinary over-edge chain stitch to a rolled seam or vice versa with no requirement for a complicated operation of adjusting thread tension is obtained. This overlock sewing machine is provided with a spring for providing a thread with prescribed tension. The overlock sewing machine is further provided with a switching mechanism for switching the thread tension between that for the rolled seam and that for the over-edge chain stitch by switching the spring between a tensioning state and a non-tensioning state. Thus, the thread tension is readily switched between that for the rolled seam and that for the over-edge chain stitch.

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 sewing machine includes two rods rotatably and slidably supported in the sewing machine and two lower loopers secured on the rods. A spindle is coupled to the rods by an eccentric and coupling members for rotating the rods and the lower loopers. One of the lower loopers may be moved axially together with one rod to which a pawl is rotatably supported, The pawl may be selectively engaging with the other rod for allowing the pawl to selectively moving the other rod axially and for allowing the lower loopers to perform two double chain stitchings.

Abstract: In a looper switching mechanism for an overlock sewing machine, a needle having a needle thread and movable vertically, is provided. A right looper having a thread hole at a tip end through which a right looper thread is inserted, includes a mounting hole into which a shaft portion of a spreader member body is attached. A hook portion having a tip end engageable with the thread hole is coupled to and extends from the spreader member body thereby forming the a spreader.

Abstract: A driving assembly includes a shaft pivotally supported in a sewing machine. A rod is movable up and down and includes a looper secured on top. A follower is secured to the shaft and includes a post. A block is slidably engaged on the post and includes a pivot axle pivotally coupled to the rod for moving the rod up and down. The block is adjusted along the rod for adjusting the distance between the pivot axle and the shaft and for adjusting a moving stroke of the looper. The rod and the looper are stopped when the pivot axle is moved to coincide with the shaft.

Abstract: A looper drive mechanism for a sewing machine includes: two loopers; looper drive shafts for driving the loopers; a main shaft extending across one plane transverse to the looper drive shafts; and torque transmission units for transmitting rotation of the main shaft to the looper drive shafts. The transmission units include: two slant grooved cams fixed to the main shaft and having grooves each extending through a full circumference and slanting relative to the main shaft; U-shaped followers each having two rollers, each of the rollers being supported by the looper drive shaft and rotating about its own axis within the groove of the slant grooved cams; and connection pins for pivotally mounting the U-shaped followers on the looper drive shafts so that the U-shaped followers are not rotatable in a direction in parallel with a line connecting the two rollers with each other but rotatable in a direction perpendicular to the line connecting the two rollers with each other.

Abstract: A safety device for an overlock sewing machine comprises: a way of selecting having an operating part located at which a loop cover covers, for selectively setting the operating part to a first mode set-up position to set up a first stitching mode using an auxiliary cloth table or to a second mode set-up position to set up the second stitching mode using a cloth waste cover, a way of contacting having an engaging part that may engage the operating part of the a way of selecting, the way of contacting being movably supported by the looper cover such that the engaging part is positioned in front of the second mode set-up position when the auxiliary cloth table is set to the looper cover, and that the engaging part is positioned in front of the first mode set-up position when the cloth waste cover is set to the looper cover, in the case that the engaging part comes in contact with the operating part, the way of contacting hindering the looper cover from turning toward a stand-up position thereof, and a way of op

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: An overedge stitch sewing device comprising a straight sewing needle and a lower looper that travels in a curved path and has advanced timing relative to the sewing needle. The device may also contain a needle thread cam which is shaped such that the needle thread is in partial contact with the front surface of the needle thread cam during the needle stroke.

Abstract: In a trimming sewing machine of the type adapted to carry out a two-thread overedge stitch, provision is made for a hooked element (15) integrally associated with the upper looper (10), which hooked element has an end work portion (15a) disposed in parallel side by side relation with the end work portion (10b) of the upper looper. The hooked element (15) engages the sewing thread (3) carried by the needle (2) at the beginning of the downward stroke of the needle. Following the downward stroke of the upper looper (10), the hooked element (15) drags along the sewing thread (3) beyond the lateral edge (5a) of the workpiece (5). Thus paired finishing portions (17a, 17b) are formed along the sewing thread (3) and they extend from each of the insertion points of the needle (2) into the workpiece (5) as far as close to the lateral edge (5a) of the workpiece (5).

Abstract: Overedge crochet stitching provides a whip stitch appearance on both sides of a fabric. Each stitch has (a) two contiguous legs of thread on the upper surface of the fabric, extending from a needle hole to the edge of the fabric; and (b) two contiguous legs of thread on the lower surface of the fabric, extending from the needle hole to the edge of the fabric. Both legs on the upper surface are bent to form a two strand bight at the edge of the fabric. Both legs on the lower surface extend first through the two strand bight of the preceding stitch and then to a one strand bight which loops around the two strand bight of the current stitch. The method and apparatus involve a threaded needle which carries the thread through the fabric, a hook which pulls thread to the fabric edge above and below the fabric, and a retractable spreader which supports a leg of thread which extends up from the needle hole to the preceding stitch.

Abstract: A stitch and mechanism for forming such a stitch including three needles and cooperating loopers for forming three parallel rows of stitches that are joined by a spreader thread that lies on the upper surface of the work piece. The spreader thread is configuration to be on both sides of the three needles such that it connects and covers the three parallel rows of stitches.

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: A needle plate structure for a sewing machine is disclosed, which includes a needle plate mounted on a bed extension which can be readily removed and replaced but which also permits adjustment of the alignment and registration of the bed extension and needle plate with respect to the work supporting bed of the sewing machine.

Abstract: Upper and lower loopers 2 and 3 are annular loopers. A pump 4 for supplying pressurized air is connected to thread introduction portions 7, which are connected to thread inlets of the loopers through annular conduits 5 and 6 and conduits 5' and 6'. The conduits 5' and 6' are slidable relatively to the conduits 5 and 6, and are connected to thread inlets of the loopers in the threading operation. In this state, the pressurized air is supplied from the pump 4 to the thread introduction portion 7, whereby the thread is transferred by the flow of the air and is fed to an outlet of the annular looper. A connecting portion moving plate 10 for connecting the conduits 5' and 6' is positioned in a disengaged position during the operation of the sewing machine by a stopper 18 and is positioned in an engaged position during a threading operation.

Abstract: For conversion of stitch mode from one stitch shape to the other stitch shape without interference with one another, a safety device for a sewing machine, as a safeguard against malfunction of the machine when conversion is made, is equipped with a stitch forming signal generator means for associating a signal with a stitch mode, a mounting-demounting signal generator means for associating a signal with table displacement, and a circuit for rendering a motor inactive irrespective of operation of a controller for the motor.

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 looper drive cam is formed of a cylindrical cam which is fixed to a main shaft so that its axis is inclined thereto at an angle of .theta.. A looper drive fork forming an U-shaped cam follower is attached to a looper drive shaft, and is engaged with the inclined cam. The fork is attached to the looper drive shaft with a degree of freedom which allows for deviation between axes of the main shaft and the looper drive shaft. As the main shaft rotates, a cam face of the inclined cam changes in a range of .+-..theta. in a plane containing the main shaft, so that the fork rotates to rotate the looper drive shaft. Owing to the freedom of degree of the fork thus attached, the motion is transmitted smoothly, and wear and rattling are prevented.

Abstract: There is provided a needle attachment position indicator device for use in a sewing machine of a type comprising a stitch pattern forming mechanism provided in a machine frame for permitting selection of one stitch pattern from a plurality of different stitch patterns, an actuator member disposed in the machine frame for permitting selection of the stitch pattern, an actuation mechanism disposed in the machine frame for setting the stitch pattern forming mechanism at selected stitch pattern in response to the selective actuation of the actuator member, and needle holding means having a plurality of needle attachment positions. The device includes an indicator member capable of indicating needle attachment position corresponding to the selected stitch pattern, in response to the selective actuation of the actuator member.

Abstract: An overcast sewing machine in which a plurality of different stitch types can be sewn.Various designs are disclosed for sewing alternatingly the stitch types 512 and 514, which consist of two needle threads, one lower looper thread and one overcast looper thread. In one design, the holder of the overcast looper can be fixed in a first working position, in which both needle threads are interlinked with the overcast looper thread, and can be displaced into a second working position, in which only one needle thread is interlinked with the overcast looper thread. According to another design, two thread eyes are provided in the overcast looper and the overcast looper thread is threaded through one of these thread eyes to form one of the stitch types and through the other thread eye to form the other stitch type. In addition, stitch type 504, consisting of three threads, can be formed by removing one needle.

Abstract: An overcasting machine for use in sewing mated insoles to uppers with gathering of the uppers relative to the insoles is disclosed wherein a step-wise driven advance disk engages the uppers and an undriven pressure disk engages the insoles at a nip area between the disks, which are spring-loaded towards each other. The advance disk drives the material of the uppers which in turn at least in part drives the material of the insoles in an advance direction during sewing. A blade is provided which extends into the nip area between the advance and the pressure disks in order to slightly separate the uppers from the insoles so that mutual slippage between them and resulting gathering of the uppers is made possible.

Abstract: An overlock sewing machine is provided with means for driving a lower looper according to a plurality of different oscillational movements independently of each other, a clutch mechanism for changing the aforementioned movements from one to the other mode, a back and forth drive mechanism for moving a lower looper back and forth, a mechanism for transmitting movement of the back and forth drive mechanism to a lower looper and releasing transmission of the movement therefrom, a lower looper oscillating means for oscillatively moving a lower looper, a mechanism for releasing oscillational movement of the upper looper therefrom, and a motion change-over device for interchanging operation between the clutch mechanism, the transmission and release means, and oscillational movement release means. The arrangement permits conversion of various stitch formations in a sewing machine to take place in a simple manner without requiring complicated adjustment.