Abstract: A blindstitch machine provided with a mechanism for feeding an end of the fabric to a position where a needle of the machine main body passes thereby to form the seam from the start end of the fabric, wherein the rotating amount of a belt is adjusted corresponding to the feeding amount of a feed dog of the machine main body, for instance, adjusted to synchronize the fabric feeding by the machine main body with that by the belt, so that the fabric is sewed without being wrinkled or stretched about the passing position of the needle.

Abstract: The invention concerns a sewing machine having a sewing-material feeder to advance the material being sewn in a step-wise manner and having furthermore a drive shaft pivoting to-and-fro in order to intermittently move the sewing-material feeder in the direction of advance of the material being sewn. The drive shaft includes a radially projecting drive crank connected by a linkbar of corresponding length to an output crank pivotably supported on a sleeve to pivot about an axis parallel to the drive shaft. The sleeve is rotatably supported on an output shaft cooperating with the sewing-material feeder and can be rotated by means of a stitch-length adjustment device. The output shaft is also parallel to the drive shaft and is driven by the output crank through a transmission provided on the sleeve. By this arrangement, a high compactness and a very advantageous force transmission between drive and output shafts can be achieved.

Abstract: A blind-stitch sewing machine has an elastic fabric bender to bulge the material to be sewed following each step of advance through an aperture of a throat plate into the arcuate path of motion of an arc needle pivoting to-and-fro transversely to the direction of advance of the material being sewed, and a stop for the bulged material mounted on the throat plate. The stop of the throat plate is designed for the purpose of sewing labels having unevenly thick rims onto the inside of finished garments along the label rim so that the arc needle pierces the edge of the label laid on the garment and emerges from the garment and the label rim is lifted off the garment at the stop so that only the garment is forced by the fabric bender against the stop.

Abstract: A seam forming device is provided for a blindstitching machine for starting a seam at the fabric end. This device has a fabric feeding apparatus positioned direct in front of a feed dog, so as to enable it to form seams which begin at the fabric end at which sewing is initiated. This eliminates the unseamed portion at the fabric end at which sewing is initiated, which has previously been inevitable when sewing with a conventional blindstitching machine. Thus, with the present invention, it is no longer necessary to manually finish the seam after blindstitching.

Abstract: The invention pertains to a blind-stitch sewing machine with a plate-shaped fabric bender to make a sewing material bulge in to the arcuate path of an arc needle. The fabric bender extends in a plane perpendicular to the path of the arc needle and is pivotable to-and-fro in this plane by means of a drive shaft extending perpendicular to this plane. The fabric bender is rotatably supported in a slot of a support assembly projecting from the drive shaft to pivot about an axis parallel to this drive shaft, and furthermore is spring biased away from the drive shaft. To achieve a narrow construction of the fabric bender and of its support assembly, the drive shaft is hollow and a torsion spring is provided to load the fabric bender. The torsion spring is mounted in the borehole of the hollow shaft where adequate space is available to install the spring.

Abstract: A down type static folder is provided for folding the edge of a garment during hemming. The folder is mounted--such as by a pivot post and latch--in a specific predetermined position on an automatic sewing machine head. The static folder is preferably mounted in place of a conventional cloth plate on the sewing machine head. The static folder includes a plate with a tongue for holding the folded over edge of the garment in a specific relationship with respect to the needle of the sewing machine during hemming. The tongue is in very close proximity to the needle (e.g. 0.0012-0.0015 inches). A flared portion of the folder automatically opens up the blank after hemming. By utilizing the invention it is possible to provide a perfect blind stitch in a T-shirt sleeve or the like.

Abstract: A blind stitch sewing machine includes a straight needle, a driving mechanism which gives a linear reciprocating motion to the straight needle, a needle guide which prevents the straight needle from sliding on the surface of the work without sticking therein, and a work raising portion formed on a work raising member so that a raised part of the work is continuously raised until it is stuck with the pointed tip of the straight needle and, after the pointed tip of the straight needle has passed the work raising member, the work raising member is withdrawn from the path of the straight needle by a distance not less than the radius of the trunk of the straight needle.

Abstract: A method of and an apparatus for feeding a cylindrical piece of fabric to a sewing portion of a sewing machine whereby a hem is set at the edge portion of the fabric as a twice-folded, three-layered band. The apparatus has parallel supports for the cylindrical fabric both secured to the sewing portion, and a plurality of pairs of clamp plates disposed to the left and right of the supports at forward and backward positions and movable to the left and right and back and forth. The cylindrical piece of fabric is supported around the supports and four pairs of clamp plates are moved in such a manner that the fabric portions are appropriately stretched and the fabric has a twice folded portion.

Abstract: The invention relates to a device for adjusting position of a holding plate on which a tailoring fabric is nipped with a presser rod. Pick-up sewing is conducted by the inventive device commensurate with change of fabric thickness during sewing route.

Abstract: A stitch shortening device for a blind stitch sewing machine. A multiple cam is provided for reciprocating the feed drive lever. An adjustment wheel with peripheral teeth regulates the drive position of the multiple cam for lengthening or shortening the stitch by adjusting the feed drive. A pneumatic motor drives a toothed wheel meshing with the peripheral teeth of the adjusting wheel. When the pneumatic power is applied, the motor rotates the adjusting wheel in the direction of rotation of the sewing machine shaft but at a greater speed to maintain the adjusting wheel in large stitch drive position. When the operator activates a switch to cut off the pneumatic drive, the toothed wheel is idled and the adjusting wheel is moved into short stitch drive position. Applying the pneumatic power again moves the adjusting wheel into large stitch drive position again.

Abstract: A blind stitch sewing machine comprises in the transmission between its main drive shaft and the fabric feeder an arrangement for stitch shortening and tacking. This arrangement comprises a coupling device with two arms which are guided for movement in longitudinal direction relative to each other and coupled by a coupling spring. One of the arms, which is fixed to the fabric feeder for movement therewith is provided with a recess into which a solenoid operated bolt is engageable when the fabric feeder reaches its forward end position to thereby stop the one arm and the fabric feeder connected thereto, while the main drive shaft and the remainder of the transmission remain in operation. Thereby feed of the fabric is substantially stopped and the seam tacked. Subsequently thereto the bolt is withdrawn from the recess and the coupling spring will again couple the one arm to the drive.

Abstract: This invention relates to a feed mechanism for a blindstitch sewing machine including a stitch shortening and tacking mechanism. Elliptical feeding movement is imparted to the feed dog by a fulcrumed lever driven off an eccentric on the main shaft of the machine. An operator controlled eccentric actuator is operatively connected to mechanism which changes the fulcrumed position of the feed lever to vary the elliptical path of the feed dog whereby effecting the advancement of the workpiece during the sewing operation without effecting needle reciprocation. An auxiliary thread tensioning assembly is provided to control the amount of thread utilized during the stitch tacking operation.

Abstract: An improved blind stitch sewing machine wherein the upper end position of a reciprocating plunger element below the curved oscillating needle is not changed by slight irregularities in the feed and is automatically adjusted to an increase in thickness of the sewing material, such as seams, providing an adjustment which is maintained over the width of the thickness increase.

Abstract: The invention relates to the joining of a multiple-layer fabric by invisible stitching, whereby two folds are made in two strips of fabric, which folds are brought close to each other so that the ridges thereof are adjacent and parallel, a series of stitches is made between the two ridges of the two folds, in the thickness of the fabric, and these operations are repeated after having displaced the two strips of fabric and thus the ridges of the two folds. The invention is more particularly applied to woollen fabrics.

Abstract: A hand held and flexible drive shaft powered apparatus is provided for movement along an incision made in flesh or other material and to be sewn closed. The apparatus includes a pair of opposite side drive wheels which are driven from the aforementioned flexible shaft and engage the flesh or other material on opposite sides of the incision therein. The apparatus is driven in a forward direction by the drive wheels along the incision and the forward portion of the apparatus includes a stitching mechanism including an arcuate reciprocally driven needle as well as an oscillatably supported and driven looper whereby a blind suturing operation may be accomplished to close the incision as the apparatus is driven along the incision by the drive wheels.

Abstract: A stitch shortening and tacking assembly for use in a sewing machine is provided. The shortening and tacking assembly is particularly suited for use with a sewing machine wherein a fabric is advanced between a presser foot and a platen disposed in a first feeding position by a reciprocating feeder that is synchronized with respect to a rib and sewing needle. The sewing needle is synchronized with respect to the feeder and rib to stitch the fabric after the web has been advanced by the feeder. The platen is adapted to be displaced from the feed position to a stitch shortening position whereby the web is advanced through a shorter interval between sewing operations to thereby shorten the length of each stitch effected thereby. The platen is further adapted to be displaced from the stitch shortening position to a stitch tacking position whereby a portion of the platen is biased against the presser foot to thereby prevent the fabric from being advanced between sewing operations.

Abstract: A pressure plate is mounted on a vertical support for holding material. A material deflector is pivotally mounted with respect to the support and is adapted to deflect the material against the pressure plate. The pressure plate and the material deflector are formed with cooperating opposed faces for folding the material and with a needle guide for passage of a needle through the folds. A needle to which thread is fed, is held on a carrier and is movably mounted on the support to carry the needle into and out of the needle guide. A clamping device is arranged at the rear end of the needle guide to grasp the thread, and a cutter means is located at the front end of the needle guide to cut the thread. All of the elements are sequentially operated by a single actuator.

Abstract: A blind stitch sewing machine is provided on its cloth carrying arm with a fabric feeler or sensor and a rod system which automatically adjusts the depths of penetration of the fabric by the needle. The sensor may be a single arm lever on a rotatably supported shaft. A second lever may be disposed on the shaft for positioning the cloth bender relative to the needle.

Abstract: A cloth feed device for blind stitch sewing machines comprises two cloth feed racks disposed in a direction perpendicular to a cloth feed direction and the two cloth feed racks are operatively connected to a main shaft of the sewing machine body, respectively, thereby obtaining individual and proper feed of each of the upper and lower cloth to be stitched.