Abstract: A sewing machine includes a driving unit, a throat plate, a pressing unit, a detecting unit and a control unit. The detecting unit includes a housing mounted to a connecting module of the pressing unit, a track ball rotatably disposed on the housing, and adapted for contact with a fabric placed on the throat plate, and a plurality of Hall-effect sensors disposed in the housing such that, when the fabric is moved on the throat plate, the track ball rotates relative to the fabric and the housing, so that a rotational speed of the track ball is detected by the Hall-effect sensors. The control unit is disposed for controlling a moving speed of a needle bar of the driving unit corresponding to the rotational speed of the track ball.

Abstract: A machine includes a fixed guide (3) which longitudinally defines two work tops (P1 ,P2), the work tops supporting and guiding the edges (30a,40a) of leather articles (30,40) to be sewn together. As it moves following an arcuate path, the needle pierces the edges (30a,40a), located on the work tops (P1,P2). After a stitch is made, the needle and a rotating crochet (19) are shifted toward the machine structure, making the two edges of the leather articles move one step forward. After having left the edges of the leather articles (30,40), located on the work tops (P1,P2), the needle and the rotating crochet (19) rise and are shifted in the opposite direction up to their starting position. Two presser feet (15a,15b), situated beside the two work tops, at the back of the needle (14), press the edges of the leather articles (30,40), when the needle pierces them.

Abstract: A device for decorative sewing of articles made of leather includes a longitudinal guide (7) a part of which is laterally delimited by two inclined flat surfaces (7a, 7b) upwardly convergent, forming at the top a tooth (10) on which an article (1) to be sewn is moved. A folding member (12), situated over the longitudinal guide (7), clamps the article (1) to the tooth (10), by folding this article (1) on the inclined flat surfaces (7a, 7b), when the needle (20) has formed a stitch (4). A leather pressing element (15) oscillates on a plane that is transversal with respect to the longitudinal guide (7) and presses the article (1) in position adjacent to the stitch 4 just formed, on the side where the needle (20) enters the article (1).

Abstract: An improved device for sewing two articles with overlapped edges, includes a longitudinal guide (7), laterally delimited by two inclined, upwardly convergent, flat surfaces (7a,7b) on which a first article (1) and second article (2) to be sewn are moved. A curved winglet (11) is made integral with the top of the guide (7) and is bent downwards to overhang one of the inclined surface (7b). A folding over member (12), moves vertically over the longitudinal guide (7), so as to clamp an edge (3) of the first article (1) on the curved winglet (11), thus folding over the edge (3) so as to overlap a corresponding edge of the second article (2), while a needle (20) makes a stitch (4). A support element (17), equipped with a presser foot (18), presses the edge of the second article against the inclined surface (7b) of the guide (7).

Abstract: A method and apparatus for forming a partial mattress sack which prevents radial bunching of the mattresses. The method includes the steps of feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. The apparatus includes a variable speed upper walking foot having an automatic speed adjustment.

Abstract: An upper needle guide (10) and a lower needle guide (40) for guiding a sewing needle during a stitching operation in order to keep the sewing needle laterally aligned along a stitching path so that the thread loop thrown by the sewing needle beneath the material being sewn is in alignment with the path of movement of a thread loop pick-up device (98). The upper needle guide includes a needle hole having a thread relief passageway (22) therein for providing a relief space for the sewing thread (34) as the needle moves through the needle hole. The lower needle guide includes a thread and needle slot (44) having a pair of V-shaped notches (46) therein. The V-shaped notches are aligned with the stitching path (84). In an alternative embodiment, the lower needle guide can comprise a feed dog (52) having a diamond-shaped needle hole (58) therein.

Abstract: A set of modified plate and needle pressure feet for use in a standard commercial sewing machine. The plate pressure foot features a single inside toe that is narrower and shifted closer to its bar, and therefore to the needle, than in standard machines. The needle pressure foot consists of two separate toes, instead of the normal slotted structure, and is asymmetric with a narrower inside toe that accommodates the shift of the plate pressure foot towards the needle. A raised needle plate insert is also provided with a rounded outside edge, for smoother advancement of the material, and a flat inside edge, for better support of the material against the narrower plate pressure foot. These accessory parts, in combination, allow a user to sew a narrower seam and smaller corners than otherwise possible with conventional equipment.

Abstract: In a machine with a longitudinal guide forming, at both sides, two working surfaces, onto which articles are arranged for sewing their upper edges, there is provided a wrinkling device in which two vertical presser feet, inner and outer, are moved vertically in an independent manner and in time relation with the motion of a needle, so that they make wrinkles on an edge of the articles, in alternate position with stitches. The needle, provided with a thread, cooperates with a rotary hook connected with a spool of stitching thread; the needle extends in an arc concentric to a shaft that moves the needle with oscillatory and translatory longitudinal to-and-fro motion.

Abstract: A zigzag sewing machine comprising a needle bar lateral drive device, a needle bar lateral drive steppping motor for controlling the needle bar drive device, a feed device for driving a feed dog back and forth, a crossfeed device for driving the feed dog from side to side, and a crossfeed stepping motor for controlling the feed drive device. The sewing machine can sew beautiful pattern stitches and neat stitches by setting up amplitude according to the minimum feeding pitch of the feed dog which is smaller than the minimum moving pitch of the needle bar. Since the needle location is determined by cooperation between the needle bar and the feed dog, the maximum lateral moving width of the needle is shorter than amplitude and the needle can be securely and accurately driven even at a high sewing speed.

Abstract: An accessory unit (2) for a sewing machine (1) for automatically sewing pieces of ribbon material (20) onto a sewing material (5), has a hollow guide shaft (23) with a longitudinal slot (24) to guide the ribbon material (20). A needle (25) is used as an advance feed mechanism and can be inserted through the slot (24) into the ribbon material (20) which passes through the guide shaft (23), by means of which the ribbon material (20) can be advanced in the longitudinal direction of the guide shaft (23). The accessory unit (2) can be swivelled around a vertical axis (x) by at least 90.degree. relative to the sewing machine (1).

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: The machine includes a fixed guide that defines two longitudinal work tops, first and second work tops, which support and guide the edges of leather articles to be sewn together. A curved needle, located next to the first work top, pierce the edge located on the first work top, pass through a slot in a guide, pierce the another edge, which is being pressed onto the second work top by a pressure foot, and, finally, operates in combination with a crochet hook to produce a stitch. The needle-pressure foot assembly serves to intermittently feed the two edges while a feed dog, acting in combination with a second pressure foot located downstream of the assembly, crimps the edge situated on the first work top.

Abstract: A presser attachment device for implementing needle feed in which a presser foot is elevated when a sewing needle is in engagement with work material to facilitate lateral shift thereof by the sewing needle. The presser foot is supported on one end of a substantially centrally pivoted presser foot carrier lever, the other end of which is formed with a gear segment. A pinion and ratchet combination is supported on one end of a pinion carrier lever, the other end of which is carried on the presser foot carrier lever pivot and has a pinion portion thereof in engagement with the gear segment. A combined cam and pawl is provided in which a pawl portion is in engagement with a ratchet portion of the combined pinion and ratchet when the sewing needle extends through the work material so as to lock the pinion against further rotation, depress the pinion and rotate the presser foot carrier lever to elevate the presser foot out of contact with the work material.

Abstract: A means for selectively elevating a presser foot out of pressure contact with a work material when a sewing needle extends through the work material. The device includes a needle bar lever pivotally supported by the sewing machine frame and having an operative connection to the endwise shiftable needle bar for implementing oscillation thereof. A lug extending from the needle bar lever may cooperate with the second end of a lift lever having a first end operatively connected with the presser foot of the sewing machine. The lift lever is carried on a selectively shiftable pintle supported by the sewing machine frame, the pintle having a first shiftable position in which the lug extending from the needle bar lever does not engage with the second end of the lift lever and a second shiftable position in which the lug does engage with the second end of the lift lever whereby the lug will effect rotation of the lift lever and have the first end elevate the presser foot out of pressure contact with the work material.

Abstract: Disclosed herein is waiting means for use in an embroidering machine which has a head; a needle bar vertically movably carried in the forward end portion of the head and having a needle operatively connected thereto for forming embroidery stitches on a cloth; a nipple vertically movably carried in the forward end portion of the head in parallel relation with the needle bar, the nipple slidably receiving the needle bar therewithin and adapted to be lowered synchronously when the needle bar is lowered so as to press the cloth at the needle location where the needle passes through the cloth; and a presser foot vertically movably carried in the forward end portion of the head in parallel relation with the needle bar and the nipple, the presser foot, when the needle is raised, being adapted to be displaced horizontally so as to horizontally feed the cloth while pressing the cloth around the needle location.

Abstract: An electronically controlled sewing machine includes the capability for sewing extended bight width patterns. When certain bight width data is recognized as needle shift data, an indication of same is provided to the sewing machine operator.

Abstract: Disclosed herein is a machine with which it is possible to effect the stitching between the vamp and the upper part of the shoe and thus to create the upper border on "moccasin" type shoes, in particular, those of the "tubular moccasin" type, which utilize a continuous end sealed vamp. An improved ruffling of the vamp prior to attachment to the upper portion is accomplished by synchronized ruffling jaws. The machine operates in a fully automatic fashion and has the capability to vary the length of the stitch and of the ruffle of the vamp in the region of the upper part of the shoe.

Abstract: A monogram sewing system comprising a monogram sewing machine capable of needle feeding as well as underbed feed dog feeding of the work piece, an articulated presser foot, and a work holding frame for constraining feeding motion of the work piece to translatory motion.

Abstract: Circumferential stitching of a tubular workpiece is assisted by means of a moving support and feed system which includes a rotatable drum of smaller diameter than the workpiece having an upper end surface positioned adjacent to a stitching station with a conventional stitching mechanism. The workpiece is prepared for stitching by pulling it axially onto the drum like a sleeve. The portion of the workpiece to be stitched is then advanced transversely through the stitching station by a puller which engages the top of the workpiece while the drum is rotated synchronously to keep the workpiece from twisting. A portion of the drive system for the stitching mechanism runs through the interior of the rotating drum. A blind cutter next to the stitching station enables the operator to cut excess thread inside the workpiece after stitching simply by moving the workpiece in a certain manner.

Abstract: A tufting machine wherein the needle bar is reciprocated by a number of like, mounting assemblies which are positioned along the length of the machine, with each assembly comprising a number of linkage arms which are pivotally interconnected to thereby minimize friction and power consumption. Also, the reciprocation of the needle bar, which is guided by the assemblies, results in a pause at the bottom of the needle movement to facilitate pick-up of the yarn loops by the loopers, and the needles have a component of movement in the direction of movement of the backing fabric at the bottom of their stroke, whereby the needles function to deposit the yarn loops on fixedly mounted loopers. The machine further includes a yarn tension control arrangement which is readily adjustable during operation of the machine.