The present invention comprises a needle that holds a needle thread and moves up and down through a throat plate, a looper that holds a looper thread and reciprocates in a space below the throat plate to entangle the looper thread with the needle thread, a retainer that reciprocates in the space below the throat plate and captures the looper thread, and a retainer movement mechanism that changes the movement state of the retainer while transmitting driving force from a drive source to the retainer. For a given period of time during which the retainer is within a given range of positions in the space below the throat plate, the retainer movement mechanism performs the reciprocating motion at a lower speed than that used before and after the given period of time, thereby continuing the state in which the looper yarn is captured.
Sewing machines for household purposes; sewing machines for
industrial purposes; motors for sewing machines; sewing
machines, and parts and fittings therefor.
A sewing machine includes a material sandwiching unit to sandwich two materials having annular edges from above and below while they are stacked so that the material on an inner wheel side is located on the lower side and the material on an outer wheel side is located on the upper side, wherein a part of the material sandwiching unit located above the two materials is vertically movable, the material sandwiching unit includes a curl-removing mechanism to straighten curls occurring on the edges of the two materials, the material sandwiching unit includes inclined parts that serve as the curl-removing mechanism and have edges extending backward from a farther side of the edges toward the edge side at a position where the two materials pass therethrough, and the inclined parts have air ejectors to eject air so as to form airflows that straighten portions of the materials where curls have occurred.
D05B 35/02 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for facilitating seamingHem-turning elementsHemmers
D05B 7/00 - Linking machines, e.g. for joining knitted fabrics
D05B 27/12 - Work-feeding means for sewing machines with rotary circular feed members rotating continuously
D05B 33/02 - Devices incorporated in sewing machines for supplying or removing the work and connected, for synchronous operation, with the work-feeding devices of the sewing machine
D05B 55/02 - Devices for fastening needles to needle bars
D05B 3/04 - Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for work feed
D05B 35/08 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for ruching, gathering, casing, or filling lace, ribbons, or bindingsPleating devicesCuttlersGathering feetCrimpersCurlersRufflers
D05B 23/00 - Sewing apparatus or machines not otherwise provided for
Provided is a sewing machine including: a pair of feed bars that are incorporated in a cylinder and are each capable of conveying a material by moving to draw elliptical trajectories in side view; an oil seal abutting outer surfaces of the pair of feed bars by surrounding an entire periphery in a direction intersecting a longitudinal direction of the pair of feed bars; and a seal-supporting unit provided on an inner wall of the cylinder and configured to support the oil seal, wherein the pair of feed bars are configured to be movable upward through the opening of the cylinder, the seal-supporting unit includes an upper opening that allows the pair of feed bars to move upward, and the seal-supporting unit is immovable relative to the cylinder when the pair of feed bars move upward through the opening.
Provided is a sewing machine including: a cylinder unit 3 configured to support two materials Fi and Fo having annular edges by being inserted therethrough while they are stacked, with one being located on the inner wheel side and the other being located on the outer wheel side; a stitch plate 12 configured to support the material Fi on the inner wheel side supported by the cylinder unit 3 by abutting it from below; a material presser 13 configured to press the material Fo on the outer wheel side supported by the cylinder unit 3 above the stitch plate 12; and a material sandwiching unit 41 provided on the near side of the stitch plate 12 and the material presser 13 and configured to sandwich, from above and below, the two materials Fi and Fo stacked, with the material Fi on the inner wheel side being located on the lower side and the material Fo on the outer wheel side being located on the upper side.
D05B 35/02 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for facilitating seamingHem-turning elementsHemmers
D05B 23/00 - Sewing apparatus or machines not otherwise provided for
D05B 29/00 - Pressers or presser feet for sewing machines
6.
DOUBLE CHAINSTITCH SEWING MACHINE EQUIPPED WITH SEAM FRAY-STOPPING DEVICE
A looper thread trapping and cutting part with blade is formed on the edge at the tip of a movable knife, and at positions in front and behind one another in the direction of reciprocating drive movement of the movable knife, on the edge and further towards the base of the movable knife than this looper thread trapping and cutting part with blade, are formed: a bladeless needle thread trapping unit that traps by catching the part of the needle thread protruding to the back side of the sewing fabric during the downward movement of the movable knife and in this state transfers the thread to a position further past the blade part of a fixed knife, and a needle thread cutting blade part that cuts, by sliding against the blade part of the fixed knife, the needle thread fed by the bladeless needle thread trapping unit to a position further than the blade part of the fixed knife. As a result of this configuration, it is possible to provide a thread-cutting device for double chainstitch sewing machine which, by reliably feeding the needle thread part that protrudes to the rear side of the sewing fabric when sewing is completed, to a predetermined cutting position, makes it possible to cut to a uniform stable remaining thread length, and to ensure an end of sewing part that has a good and uniform finish and appearance.
A looper thread trapping and cutting part with blade is formed on the edge at the tip of a movable knife, and at positions in front and behind one another in the direction of reciprocating drive movement of the movable knife, on the edge and further towards the base of the movable knife than this looper thread trapping and cutting part with blade, are formed: a bladeless needle thread trapping unit that traps by catching the part of the needle thread protruding to the back side of the sewing fabric during the downward movement of the movable knife and in this state transfers the thread to a position further past the blade part of a fixed knife, and a needle thread cutting blade part that cuts, by sliding against the blade part of the fixed knife, the needle thread fed by the bladeless needle thread trapping unit to a position further than the blade part of the fixed knife. As a result of this configuration, it is possible to provide a thread-cutting device for double chainstitch sewing machine which, by reliably feeding the needle thread part that protrudes to the rear side of the sewing fabric when sewing is completed, to a predetermined cutting position, makes it possible to cut to a uniform stable remaining thread length, and to ensure an end of sewing part that has a good and uniform finish and appearance.
A sewing machine provided with: a pair of feed bases (41) accommodated in a cylinder (3), each of the feed bases operating in an associated manner so as to trace an ellipsoidal trajectory as viewed from the side, whereby a cloth can be fed; an oil seal (61) surrounding the entire periphery of the pair of feed bases (41) in a direction intersecting the long direction, the oil seal (61) coming into contact with the outer surface of the pair of feed bases (41); and a seal support part (62) provided on the inner wall of the cylinder (3), the seal support part (62) supporting the oil seal (61); the pair of feed bases (41) being configured so as to be able to move upward from an opening (31) of the cylinder (3), and the seal support part (62) being provided with an upper opening (625) that permits the pair of feed bases (41) to move upward, whereby, when the pair of feed bases (41) are moved above the opening (31), the seal support part (62) is rendered immobile in relation to the cylinder (3).
A sewing machine for hem includes a turn-back device provided in front of a needle location position on a sewing machine bed, the turn-back device turning back an edge part of cloth into a state of being folded one above the other, and then feeding the turned-back cloth. In front of the turn-back device, a feed belt and a cloth presser foot are arranged opposite to each other with a cloth feeding path in between. By virtue of operation of a rotary solenoid performed on the basis of a detection result of a detector arranged in front of the opposing portion, the cloth presser foot is raised and lowered and thereby holds the cloth in cooperation with the feed belt so as to exert a movement force in the right and left directions onto the cloth.
D05B 35/02 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for facilitating seamingHem-turning elementsHemmers
D05B 29/08 - Presser feet comprising relatively-movable parts
D05B 35/08 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for ruching, gathering, casing, or filling lace, ribbons, or bindingsPleating devicesCuttlersGathering feetCrimpersCurlersRufflers
Provided is a sewing machine including: a fabric folding device that includes a guide member that is movable relative to the fabric and a stationary member that is located adjacent to the guide member; and a retraction detection member that is located on a front side of the guide member and includes a pair of electric contacts that enable electric conduction by contacting with each other, the retraction detection member being configured to switch the operational state of the pair of electric contacts by abutment of a start point of a hemming seam with the retraction detection member in association with movement of the fabric in sewing the fabric. The guide member is moved by switching the operational state of the pair of electric contacts so as to retract from a path of the start point moved along with movement of the fabric.
D05B 35/02 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for facilitating seamingHem-turning elementsHemmers
D05B 1/18 - Seams for protecting or securing edges
A cloth edge curl correction device includes: a support plate extending along the direction of feed of a cloth at a front position of a turn-back guide device folding up and down over a given width the edge part of the cloth to be fed into a needle location position on a cylindrical bed; a cloth support provided near the support plate and supporting the cloth from the under; and an air ejection nozzle ejecting air toward a base part of the cloth support. Ejected air from the air ejection nozzle is applied to the edge of the cloth on the cloth support so that a curl generated in the edge is smoothed and corrected and then the cloth is fed in a manner that the edge goes along the support plate.
D05B 35/02 - Work-feeding or work-handling elements for sewing machines, not otherwise provided for for facilitating seamingHem-turning elementsHemmers
A thread hook and a looper thread holder are arranged on a rear side of a needle drop position of a sewing machine. When usual sewing is completed, the thread hook and the looper thread holder swing and move close to a looper. A hook part provided at a tip end of the thread hook holds a needle thread loop caught by the looper and positions it on an advance end side of the looper away from the needle drop position, and a thread receiving part provided at a tip end of the looper thread holder holds a looper thread extending from the looper to cloths and positions it on the front side away from the needle drop position. The sewing machine performs sewing for at least one stitch while maintaining positions of the needle thread loop and the looper thread.
D05B 1/08 - General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
Sewing machines, sewing machines for household purposes,
sewing machines for industrial purposes; parts and fittings
of the aforesaid goods; motors for sewing machines.
14.
METHOD FOR PREVENTING STITCH FROM COMING APART, DEVICE FOR PREVENTING STITCH FROM COMING APART, AND STITCH STRUCTURE
A thread hook (3) and a looper thread holding body (6) are disposed on the rear side of a needle entry position on a sewing machine. The thread hook (3) and the looper thread holding body (6) swing and come close to a looper once a normal sewing process completes. A hook part (3b) at the tip of the thread hook (3) holds a needle thread loop captured by means of the looper, and a thread receiving part (6a) disposed on the tip of the looper thread holding body (6) holds the looper thread extending from the looper to a sewing fabric, the hooked part (3b) and the thread receiving part (6a) each being located on the front side relative to the needle lowering position. The sewing machine performs a sewing process amounting to at least one stitch by maintaining the position of the needle thread loop and the looper thread. As a consequence it is possible to effectively prevent stitches from coming apart which typically occurs in a multi-thread chain stitch without being influenced by the tensile force of the needle thread and the looper thread.
In a presser foot and a sewing machine according to the present invention, a guide hole is formed in a presser leg to which a fixed knife is attached, so as to passing through the presser leg up and down, and a knife holder is fitted and held to the guide hole. The fixed knife is inserted to a retention groove provided in a peripheral surface of the knife holder through a window hole provided in the presser leg, and is fixed by fastening a stop screw. A position of the fixed knife is adjusted in a vertical direction by moving the knife holder in the vertical direction along the guide hole and fastening the stop screw at an appropriate position, thereby changing a cut position of ends of fabrics and changing an overlapped width of the fabrics at a time of seaming.
