Abstract: An apparatus for cutting strip-shaped sewing material on a sewing machine by means of power-operated cutters co-operating in scissor-like manner.For enabling as well the separation of strips of materials that are hard to cut and for increasing the safely cuttable strip width in general, the invention proposes a cutting apparatus designed in the manner of a "guillotine". The apparatus is characterized by two cutter plates (1, 2) of equal size which are each formed with two cutting edges (1.1, 1.2; 2.1, 2.2) and which are disposed on a support (3) so as to be pressable against each other and at the same time linearly slidable in opposite directions with respect to each other.

Abstract: An adjustable inlet including two members which act together to define an opening through which the stitch chain enters a stitch chain cutting assembly to be cut. Each member contains a top and a front side substantially perpendicular to each other. The members are adjustably mounted at the entrace to the stitch chain cutting assembly by a combination of a screw and a pin, which fit through holes located in the front side of each member. The holes are elongated to allow adjustment of one or both members upon loosening of the screw, which adjustment would result in the narrowing or enlargining of the inlet.

Abstract: A presser foot retainer system for use in a sewing machine which utilizes a presser foot device including an elongated generally horizontal foot, a horizontal cross pin positioned above the foot and extending in a direction generally at right angles to the direction of elongation of the foot, and a connector connected both to the pin and the foot to support the pin in said position. A presser bar has a slot in the lower end of the bar which extends generally parallel to the pin. The pin is detachably engageable in the slot to detachably secure the device to the bar.

Abstract: A switching device is provided for a sewing machine for switching operation of the sewing machine from a zigzag stitching to embroidering or vice versa. The switching device comprises a rotatable disc fixedly mounted on an output shaft of a stepping motor and a sliding member that movably connects one end of a transmission rod via a pin, the other end of which is connected to a needle bar supporter or a fabric feed device, with the rotatable disc so that the one end of the transmission rod is movable between a first position on the rotatable disc which coincides with the center of rotation of the rotatable disc, and a second position on the rotatable disc which is spaced apart from the center of rotation of the rotatable disc.

Abstract: A rotary looper for a lockstitch sewing machine, which can receive either a coreless thread package or a thread-wound bobbin. An upper bobbin-housing part is provided with two separate thread-tensioning elements and with respective thread-guide slots associated with them. In this way, the thread withdrawn either from a coreless thread package or a looper-thread bobbin passes over an optimally-shaped thread path on its way to the sewing area, and in both cases, a specifically adapted thread-tensioning force is exerted on the thread withdrawn. Preferably, the front part of the thread supply, in the coreless package or bobbin, can be accommodated in front of the movement path of the sewing needle, whereby the bobbin-housing can accommodate an extra-wide thread supply. An upwardly extended shoulder is provided on the lower part of the bobbin housing, so that the axially widened needle thread loop can slide unimpeded over the axially-extended bobbin-housing upper part.

Abstract: Presser device in a sewing machine, comprising a support provided with structure for holding and releasing a presser foot. The support is of a general parallelepiped shape and has two parallel grooves that are arranged on two opposing lateral faces of the support, these grooves forming sliding guides for a sewing attachment. One face of the support comprises a translucent window, an electrical bulb being arranged in the support behind the window. The support also has at least one bore for receiving a rod for securing a sewing attachment. This bore is perpendicular to the axis of the presser bar. The support also has two parallel grooves arranged on its other two lateral faces.

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 wiper unit has a supporter secured to the arm of a sewing machine. A stopper is secured to the supporter. A wiper shaft is rotatably supported by the supporter. The stopper restricts the rotation of the shaft. A wiper is mounted on the shaft. The wiper has a wiper arm and a tip end thereof. The tip end has a hook for wiping the tip end of an upper thread. A wiper operation crank is secured to the wiper shaft for adjusting a turning operation thereof relative to the wiper. An operation link is connected by a pin to the operation crank. A driving unit drives the operation crank reciprocally and drives the crank and shaft to turn about the axis of the shaft.

Abstract: In a sewing machine, a pivotable lever is provided in accordance with the present invention which carries a presser foot which is brought by an actuating device from a low position to a high position. In the low position the foot is applied to the material to be sewn. In the high position the foot is spaced from the material. The lever is equipped with rolling members which rest on guide ramps. The members and ramps have a profile such that during displacement of the presser foot between its two positions, the foot always follows a vertical path.

Abstract: A yarn control system and apparatus for use in the manufacture of non-woven, non-knitted fabrics which have a pile supported by a backing cloth, such as carpets, the apparatus including a plurality of needles for inserting yarns from yarn supplies into the backing cloth to provide a pile material and control means for controlling the amount of each yarn inserted by the needles to maintain constant pile height, the control means including a yarn compensating roller upstream of the needles and around which each yarn is entrained, and biassing means acting on the roller to maintain a constant tension in the yarns, the biassing means preferably comprising pneumatic piston and cylinder devices. The compensating roller may have a roughened surface and is preferably able to rotate in one direction only, but in an alternative construction, a driven guide roller which has a roughened surface is provided and the compensating roller has a smooth surface.

Abstract: In the sewing attachment of appearance-enhancing piping along the edge of material, a seam using initially applied larger stitches and at the trailing edge smaller stitches effective to tack the seam against unraveling, and a cutter located to sever the piping flush with the end of the material, so that after-sewing trimming is not required.

Abstract: A thread end holding unit of a sewing machine employs a needle thread gripping puller driven so as to be positioned either at a thread catch position or a return position. The puller has a hook portion at a tip end thereof adapted for catching a needle thread extended from a needle when the needle thread gripping puller is positioned at the thread catch position. The needle thread is caught and held by the hook at the return position. First and second holding members are respectively fixedly mounted on a supporter fixed to the arm. These holding members have press portions forcibly pushed elastically by both sides of the needle thread gripping puller for pressing and holding the thread end of the needle thread caught by the hook when the hook portion is positioned at the return position.

Abstract: A sewing machine wherein the fabric supporting arm or bed carries a fabric guide which is movable to any one of a number of positions at different distances from the needle. The fabric guide carries a tape measure or the arm or bed carries a ruler. The tape measure or the ruler has an eyelet for temporary attachment of the tape measure or of the ruler to the needle. The fabric guide is movable along the tape measure or ruler to a position at a desired distance from the needle. The eyelet is then detached from the needle and the tape measure or the ruler is retracted, either by hand or by a spring, to be out of the way during sewing. At such time, one edge of the fabric abuts a stop of the fabric guide while the needle makes a row of stitches at the selected distance from the edge.

Abstract: A needle thread drawing device utilizes a thread end holding device rotatably mounted on an arm of a sewing machine. A needle thread gripping puller which can be disposed to be at a thread catch position or a return position has a hook portion at a tip end thereof for catching a needle thread extended downward from a needle hole of a needle. A needle thread drawing member is mounted swingably on the side of the arm and has a hook portion at a tip end thereof. A cam member is positioned at the side of the thread end holding device and is rotatable in synchronism with the puller for rotatably swinging the needle thread drawing member so that the hook portion can hold the needle thread when the needle thread holding portion is positioned over the needle hole of the needle and can draw a thread end of the needle thread when the hook portion of the puller is positioned under the needle hole of the needle when the puller is disposed in the thread catch position.

Abstract: In the needle thread wiper of sewing machine according to the invention, the hook formed at the front end of a leaf spring is projected in or out from the front end of the guide element formed nearly in a J-form, and when inserting this hook into the front end of the guide element, the needle threads extending between the needle and cloth is hooked on the front end of this hook so as to be placed into the front end of the guide element together with the hook. At the front end of the guide element, at the positions corresponding to the both flat surfaces of the leaf spring, notches are formed so as to extend from the front end to the base part side. The needle thread introduced into the front end of the guide element is guided by the notches and placed deeply into the guide element. The needle thread is held merely in a state of being hooked between the hook and the guide element, and so that is easily unhooked, almost without any resistance, when the needle is lowered upon start of next sewing step.

Abstract: A cutting device for an automatic sewing machine, including a knife (2) and a knife guard (3) which projects the fingers of the operator. The knife (2) is capable of being lowered to a cutting area in a cutting plane (S) only when the knife guard (3) is in its protecting position. The knife (2) and knife guard (3) are driven simultaneosuly by a single drive, the knife guard (3) reaching the cutting plane (S) earlier than the knife (2). If the knife guard (3) cannot substantially reach its protective position, then the downward movement of the knife (2) is mechanically blocked, preventing further movement of the knife (2). This mechanical blocking is carried out by the coaction of a lever (20) which is connected to the knife guard (3) by a connecting member (21), the lever (20) being moveable in translation and rotation, and by a lever (19), which is moveable rotationally only and has a stop (37) thereon for blocking movement of the knife (2) when the knife guard (3) is not in its protective position.

Abstract: A stitching guide for attachment of a zipper to a base material comprising a strip of elongated material having at least one substantially straight longitudinal edge, a plurality of in-line perforations in the strip extending along a longitudinal line substantially parallel to the straight longitudinal edge, and at least one slot in the strip, the slot having a geometrical configuration adapted to circumscribe the slide on the zipper. The perforations in the strip are centrally located for pin insertion during centered zipper application and offset for pin insertion during lapped zipper application. The strip is preferably sufficiently flexible to allow pin insertion and is tinted and may have measurement indicia along the straight longitudinal edge.

Abstract: A sewing apparatus for use on a quilting machine having an intermittent tension mechanism and a hopping presser foot mechanism cooperating with eccentric cams located on the main drive shaft of the sewing apparatus.The intermittent tension mechanism includes an eccentric cam having an outer surface adapted to abut a cam follower which engages thread holding tension disks that are biased together by action of a spring. Pressure between the disks is increased during the final tightening of the stitch due to the reciprocating motion of the cam follower.The hopping presser foot mechanism includes a rocking bar pivotally connected at one end to a reciprocating arm and slidingly and pivotally connected at the other end to a presser foot bar. A ball and race mechanism pivotally connects the rocking bar with the reciprocating arm. The arm reciprocates due to action of the eccentric cam.

Abstract: A sewing machine needle mounting device includes a grip portion and a needle engaging portion. A vertical hole is vertically passed through the engaging portion. The hole may be configured in two shapes. One preferred configuration is an inversed cone which includes a substantially vertically extending ledge to fit within a thread guide of a sewing machine needle. Another preferred configuration is an inversed hemicone to engage with a flat surface of the sewing machine needle. The invention is useful for mounting needles to needle bars of both domestic and industrial sewing machines.

Abstract: A presser foot for a sewing machine comprising a bifurcated foot having first and second limbs. the first limb is about twice as wide as the second limb. Selectively spaced indentations are provided on at least one of the limbs to facilitate accurate stitching. The indentations can be on the tops or the sides of the limbs.