Abstract: In a sewing machine, a presser foot lifting mechanism provides two springs, a first spring the compression of which can be changed by a solenoid actuated coil linkage and a second spring the compression of which can be changed by an operator's knee-action for lowering a presser foot. An operation lever rotated by an operator's knee-action controls the timing of solenoid action. A positional difference or gap is provided for the operation lever between a "solenoid on" position and a "first spring off" position, so that an operator can rotate the operation lever without feeling the resisting force of the first spring.

Abstract: The lifting device (19) of the presser foot (21) of a sewing machine is operable through the use of an operating axle (18) and a toggle lever (20). The operating axle (18) is connected to a slide (15) capable of engaging and disengaging a coupling mechanism (10). The coupling mechanism (10) is arranged between the lifting device (6) of the feed dog (3) and the oscillating drive means (7) of the lifting device. During the lifting of the presser foot (21) by means of the toggle lever (20), the coupling pin (12) of the coupling mechanism (10) is simultaneously placed out of engagement with the driven oscillating lever (8) by means of the slide (15). Thus the drive of the lifting device (6) is interrupted, and a spring (13) pulls the feed dog (3) into its lowered position. Thus the manipulation of the sewing material is made possible without the feed dog presenting an obstacle.

Abstract: A button sewing machine is provided on a fabric and button positioning plate with a thread supporting tongue to extend longitudinally in a needle hole into engagement with the underside of fabric and enable thread to be sewn under and across the tongue to prevent the fabric from slipping on the plate during a button sewing operation.

Abstract: A sewing machine has a feed for the workpiece which is to be sewn. A workpiece conveyor performs a skipping feed movement below the workpiece. Above the workpiece a turning device enables the workpiece to be turned about an axis which is coincident with the needle. In order to sew in an edge-parallel manner with an automatic guidance, workpieces made from soft materials with curved or angular seam courses, may be turned responsive to air nozzles directed in acutely-angled manner on to the supporting plate. The air nozzles are arranged tangentially, and in spaced manner, with respect to the needle.

Abstract: Disclosed herein is an embroidery machine having a table on which a cloth is spread to be fed, and a plurality of heads disposed above the table in parallel relation to each other, each of the heads having a needle for forming embroidery stitches on the cloth, the needle having an axis of rotation which is the origin of the X and Y axes of the Cartesian coordinates with respect to the table, including a frame placed on the table and horizontally movable in the directions of the X and Y axes in response to signals produced by a control unit for feeding the cloth; a feed plate provided horizontally under the cloth and adapted to move horizontally in the direction where the frame is moved and to return independently to its original position; and a cloth-pressing member vertically movably surrounding the needle for cooperating with the feed plate so as to tightly hold the cloth around the needle location therebetween, the cloth-pressing member being adapted to move horizontally in any direction around the needle

Abstract: A work holding clamp for a four hole button sewing machine includes a button holding foot formed with a needle accommodating aperture having an hourglass shape with four recesses arranged at the corners of a square pattern graphically to indicate to an operator the proper hole orientation.

Abstract: A double lever is provided having a forward arm which is operatively connected to a collar of a presser bar and a rearward arm which is connected via a linkage to an operating lever. A guide arm is articulated to the rearward arm and carries an index pin guided within a parallelogram-shaped inherently closed cam route. A spring-loaded swivel arm including a detent catch is associated with the lower cam section of the closed cam route. Upon light pressure being exerted on the operating lever, the detent catch locks the index pin in a position wherein the presser mechanism lies in close proximity to an uppermost lifted position. By additional pressure being exerted on the operating lever, the index pin moves passed the locking position. With the subsequent release of the operating lever, the presser mechanism returns to the lowered position.

Abstract: An arrangement for changing the condition of an electrical circuit path when the presser bar lifter is pivoted to lift the presser bar uses a modified thread tension release cam which pivots with the presser bar lifter and a contact strip which is adapted to contact the cam when the presser bar is raised.

Abstract: An apparatus and method for implementing bobbin winding in place in a looptaker of a sewing machine. When a presser foot lift lever is manipulated to elevate a presser foot, and the sewing machine motor is activated, a series of two or three endwise reciprocations of the sewing machine is effected to bring an upper thread to the lower thread carrying bobbin, after which further endwise reciprocation of the sewing needle is held in abeyance while actuation of the sewing machine motor is continued, to provide the least disturbance of upper thread passage to the lower thread bobbin. No other bobbin winding signaling steps are required.

Abstract: A presser lifting arrangement for an industrial sewing machine having a knee shift device which manually elevates a presser foot to a height above the work fabric to permit free movement of the work fabric therebeneath. Further motion of the knee shift device actuates a snap action switch which operates to connect a solenoid to a source of power to elevate the presser foot to its maximum height. In a second embodiment, the knee shift device includes internal switch contacts which energize a first solenoid to raise the presser foot a distance sufficient to permit free movement therebeneath, and continued actuation of the knee shift pad actuates a snap action switch which energizes a second solenoid to raise the presser foot to its maximum height.

Abstract: An axially aligned presser bar collar and presser bar bushing in a sewing machine are connected by a helical spring having one end portion affixed to the collar and having the opposite end portion threaded onto a resilient split ring which is located in an annular groove in the bushing.

Abstract: A reduced load presser bar mechanism having a separate secondary spring that may easily be disengaged or engaged by the operator to counter balance the biasing force of the primary presser bar spring thereby reducing the normal force exerted by the presser foot on the work piece to near zero.

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: A tension spring concentric with the presser bar pulls the presser foot down against the work. The spring is threaded onto two holders, each of which fits around the presser bar. The first holder is attached to the presser bar near its upper end but the second allows the presser bar to slide within it. The second holder is slidably attached to a bracket and controlled by a presser bar pressure regulating cam to slide up and down in the bracket and thereby change the tension in the spring to exert a controlled force on the presser foot. The first holder is also slidably mounted in the bracket, and is controlled by a lever that has a lifting cam linked to the first holder. When the lever is lifted, the first holder is lifted to raise the presser bar and presser foot away from the work. This extends the spring, which urges the presser foot back down against the work as soon as the lever is lowered.

Abstract: A lifting device for the presser foot of a sewing machine comprising an operating lever provided on a front face of the sewing machine for synchronous knee or arm operation. The operating lever is connected via a linkage to one end of a double lever arranged in the proximity of the rear side of the machine. The other end of the double lever engages the presser bar. The double lever is supported to be pivotable in a vertical plane. An upwardly projecting guide arm is operatively connected to the lever arm and includes a detent member which is in engaging relationship in a groove which is disposed in a vertical plane. The groove extends approximately in the shape of a heart and closes on itself. The groove has, at the tip of the heart, a lower detent location and, in the central zone between the two upper arcs of the heart an upper detent location for receiving the detent member. Upper stop locations are positioned in the upper arcs of the heart.

Abstract: An apparatus for limiting the displacement of a presser bar reciprocatingly mounted in a frame of a sewing machine is disclosed to include a contact member for contacting the presser bar after the presser bar has moved a predetermined distance. The apparatus further includes a latch member, having the contact member associating therewith, for releasably engaging the frame of the sewing machine so that the contact member is prevented from moving in the same direction as the presser bar. So that the latch member may be disengaged from the frame, the present invention also includes a mechanism for decoupling the latch member. The apparatus further includes a mechanism for positioning the latch member so that different portions of the contact member overlie the path of movement of the presser bar during different portions of a stitching cycle.

Abstract: A hollow bushing (22 or 54) that guides a presser bar (21) to move in a longitudinal direction is threaded at one end (29 and 30). The outer surface of that end is round and, below the thread (59), fits closely but rotatably in a channel (32) in the head (16) of a sewing machine. The bushing is not fixedly held in place in the channel (32). Instead, a tension spring (33) screwed onto the threaded end and onto a threaded member (37) attached to the end of the presser bar (21) within the head (16) pulls the presser bar downwardly so that its foot (24) normally presses against the work (46) and simultaneously pulls the bushing (22 or 54) toward the head (16). A shoulder surface (27 or 58) at a certain location on the bushing (22 or 54) acts as a stop to limit the extent that the cylinder can be drawn into the head.

Abstract: An embroidering machine comprises a plurality of embroidering head each equipped with a plurality of needles formed into a group each with its thread. A needle bar is engageable with one needle at a time in the group to bring the needle from a rest position thereof into an operating position. A presser foot mechanism with a presser foot attached cyclically moves the presser foot upwardly and downwardly from an upper dead center position to a lower dead center position. The presser foot is provided with a hole for the passage of the one needle. Thread cutting and holding devices are provided for cutting the thread of the one needle to form a thread end portion and hold the thread end portion. Upon the termination of an embroidering operation with the one needle, the presser foot mechanism is operable to move the presser foot substantially transversely to a longitudinal axis of the needles and, after the thread is cut, to lift the presser foot upwardly beyond its upper dead center position.

Abstract: An improved upper roller feeding mechanism for a sewing machine which mechanism is contained entirely within the head of the frame of the sewing machine and wherein the roller is driven by a drive mechanism supported by the frame which includes a rotary shaft and means for converting the rotating movement of the shaft into an oscillating movement. A one way clutch is utilized to translate the oscillating motion into incremental rotary movement which is in turn transmitted to the roller.

Abstract: A presser device for a sewing machine having a rockable member pivotably carried by the sewing machine frame and connected to a presser bar to axially move the same up or down, a pivoted lever urged by a spring towards the rockable member, and, a drag link carrying a roller on one end, which roller extends between the pivoted lever and one of two surfaces above and below the pivot of the rockable member to urge the presser bar upwardly or downwardly, respectively. Presser bar pressure is varied by varying the spacing between the roller and the pivot of the rockable member. Two embodiments are disclosed, a first wherein the position of the roller is varied by means of a second pivoted lever connected to the drag link; and, a second wherein a pair of push buttons operate on a bell crank connected to the drag link, one of the push buttons incorporating a cam to control movement of the drag link.

Abstract: This disclosure relates to means for preventing the reciprocating needle of a sewing machine from operating in a zig-zag mode when a straight stitch throat plate means is positioned on the work bed surface. A latching means is provided for selective interconnection between the zig-zag jogging mechanism and the needle mechanism with said latching means being responsive to movement of the presser mechanism for unlatching the latching means. A locking mechanism is also provided to lock the latching mechanism in an unlatched position.

Abstract: This disclosure relates to means for preventing the reciprocating needle of a sewing machine from operating in a zig-zag mode when a straight stitch throat plate means is positioned on the work bed surface. A latching means is provided for selective interconnection between the zig-zag jogging mechanism and the needle mechanism with said latching means being responsive to movement of the presser mechanism for unlatching the latching means. A locking mechanism is also provided to lock the latching mechanism in an unlatched position.