Abstract: A differential feeding mechanism for a sewing machine employs a differential mechanism to move first and second toothed bars. The differential mechanism includes a first link member to drive a first toothed bar, a second link member, and a third link member to drive a second toothed bar. The third link member is provided with an adjustment groove, in which being slidably disposed a slide member which can be adjusted in position with respect to the third link member. Adjusting the position of the slide member can change the fulcrum of the third link member and the swing amplitude of the two ends of the third link member, which consequently adjusts the differential feed of the first and second toothed bars.

Abstract: A tandem sewing machine and the stitch it forms. The sewing machine includes a stand frame; a drive motor, a throatplate; and at least two offset needles. The offset needles have a needle stagger (&sgr;) which, in combination with the needle spacing (D) produces a stitch stagger to displacement ratio (S/D) of greater than about 1 of the improved stitch. The sewing machine may also include an overedge stitching needle assembly and a compound feed assembly. In the preferred embodiment, the compound feed assembly includes a bottom feed dog and a top feed dog, wherein the top feed dog is a differential feed with respect to the bottom feed dog. The sewing machine may further include a second bottom feed dog which may also be a differential feed. In the preferred embodiment, the overedge stitching needle assembly includes at least one needle performing an overedge stitch.

Abstract: A sewing machine related to the present invention comprises a needle plate and feed dogs. A second feed dog slot provided at the cloth send-in side of a portal shaped needle hole of the needle plate is shifted to the right side from the center of the portal shaped needle hole. The left side first feed dog slot is extending toward the second feed dog slot side in the cloth send-in side of the portal shaped needle hole, so as to be formed a wide breadth portion from side to side. A first cross-piece of the needle plate is disposed between the wide breadth portion and a needle drop portion of the portal shaped needle hole, and a second cross-piece of the needle plate is disposed between the second feed dog slot and said needle drop portion. The first cross-piece is formed wider in the cloth feed direction than the second cross-piece. A differential feed dog disposed in the cloth send-in side of the needle drop portion is composed in a shape combining each feed dog slots.

Abstract: A sewing machine related to the present invention comprises a needle plate and feed dogs. A second feed dog slot provided at the cloth send-in side of a portal shaped needle hole of the needle plate is shifted to the right side from the center of the portal shaped needle hole. The left side first feed dog slot is extending toward the second feed dog slot side in the cloth send-in side of the portal shaped needle hole, so as to be formed a wide breadth portion from side to side. A first cross-piece of the needle plate is disposed between the wide breadth portion and a needle drop portion of the portal shaped needle hole, and a second cross-piece of the needle plate is disposed between the second feed dog slot and said needle drop portion. The first cross-piece is formed wider in the cloth feed direction than the second cross-piece. A differential feed dog disposed in the cloth send-in side of the needle drop portion is composed in a shape combining each feed dog slots.

Abstract: The present invention is an ultrasonic cylinder arm machine which includes a combination of the use of ultrasonics with a cylindrical arm that extends out from the ultrasonic unit and back toward the horn of the ultrasonic unit whereby the machine is especially suited for the manufacture of tube shaped or cylindrical shaped articles such as trouser legs and long sleeved shirt sleeves.

Abstract: A method and apparatus provided for the automatic production of discrete cuffed sleeve blanks from distinct initial sleeve blanks and a continuous roll of knit cuffing material. The initial sleeve blanks are place end-to-end, a gap is introduced between them, and they are passed in a first direction with a first edge thereof parallel to the first direction. The continuous length of cuffing material is folded over to provide a double thickness having a first edge which is parallel to the sleeve blank first edge, the cuffing material and sleeve blank first edges are overlapped, moved together, and sewn to each other with an "over-edger" automatic sewing machine. The cuffing material is stretched just prior to being fed to the sewing machine, and is stretched again after sewing and severed from the rest of the roll. A driven roller includes non-rotatable washers having projecting portions engaging a blade of the cutting mechanism.

Abstract: An automated assembly produces a continuous, contiguous series of individual pieces sewn in a continuously operating sewing machine by conducting successive pieces to the sewing station through a feed station. The feed station may receive the pieces intermittently and irregularly but is equipped with guides and drives for accelerating each successive piece relative to the preceding pieces being sewn in the sewing machine to overtake any spatial gap between the trail end of the preceding piece and the lead end of the succeeding piece so that these ends abut prior to completion of the sewing of the preceding piece. The drives are continuously operating, yet overlapping of the end-to-end relation of the pieces and bunching or furling of the pieces due to this end-to-end abutment are prevented by guide surface confinement of the pieces in the feed station and a predetermined capability for slippage in the drive. The assembly has application in the making of closures for fly openings.

Abstract: A system for the manufacture of seamed articles from a strip of limp fabric includes an apparatus for feeding strips of fabric and for automatically folding the strips along desired fold lines. A fabric joining apparatus forms seams in the folded strips of fabric at desired locations while providing near-field control of the fabric using selectively operative feed dogs and far-field control using a matrix of selective retractable endless belts.

Abstract: A sewing machine of the differential type which, in one stitching operation, gathers a first fabric material and sews a band to one side of said first fabric material and a second fabric material to the other side of the first fabric material. The throat plate of the sewing machine has a longitudinal groove disposed ahead of the sewing needle to guide the band underneath the fabric material being gathered by the gathering dog. No gathering dog is in register with the groove. The machine may include overlock stitching.

Abstract: A piece of loose textile with a spread cut edge is fed to a stitching location in accordance with a method wherein the piece is gripped at an interior location spaced from the edge and this interior gripped location is advanced continuously at an intermediate transport speed in a transport direction parallel to the edge toward the stitching location. Thus relative to the direction the edge has a leading portion and a trailing portion that are successively displaced past a speed-change location. This leading portion of the edge is advanced in the direction toward the stitching location at a relatively slow transport speed slower than the intermediate speed and the trailing portion of the edge is advanced in the direction toward the stitching location at a relatively fast transport speed faster than the intermediate speed. This system therefore automatically rectifies the edges of the piece.

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: An apparatus (10) for providing stitching along the edges of material panels on a semi-automatic basis includes a sewing machine (28) and a material locator assembly (30). The locator assembly (30) incorporates a guide member (62) with a predetermined guide edge for engaging the edges of the material panels prior to sewing. Sensor (46) senses the presence of a material panel in proximity with the sewing machine (28). Sensor (70) senses engagement with guide member (62) by a material panel. A clamp assembly (122) selectively immobilizes each material panel after sewing and before collection by stacker assembly (34). Preferably, air flow is directed through ports (50) formed in a portion of the working surface adjacent to the sewing machine (28) to facilitate advancement of each material panel.

Abstract: A machine for sewing together two workpiece parts having edges of equal or unequal length by using a bead seam, especially for joining together the edge of a vamp and the shorter edge of a plug of a true moccasin shoe, so that the length of the plug matches that of the longer edge of the vamp, in only one operation. The bead seam forming device essentially consists of a folding finger acting in front of the needle of the sewing machine and in synchronous driving connection with the needle; several machines are described which are provided with different bead seam forming devices.