Abstract: A kit for adding or replacing an automated upper walking foot stepping height adjustment to a sewing machine, the kit includes a mounting assembly including an actuator bracket, an actuator coupled to the actuator bracket, a drive assembly, and a needle drive assembly. The actuator includes an actuator shaft that extends and retracts. The drive assembly includes a drive shaft, a drive arm coupled to the drive shaft and the actuator shaft, and a guide coupled to the drive shaft. The needle drive assembly includes a variable drive crank coupled to the guide and configured to couple to a needle drive shaft of a sewing machine. Selectively extending and retracting the actuator shaft selectively adjusts a stepping height of an upper walking foot.

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: 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: The invention describes a process for carrying out a sewing operation with a sewing machine having a needle feed.In present sewing operations with a sewing machine having needle feed, defective stitches are often formed at the beginning, because the initial threads are not sufficiently clamped in the needle plate as a consequence of the elongated stitch hole. In the new process, the position of the needle prior to the beginning of sewing is displaced into an end zone of the stitch hole for performing a preselected number of initial stitches.

Abstract: Apparatus for changing the stitch length of double lock stitch sewing machine while the machine is in operation. The apparatus including a first transmission having a variable transmission ratio that can be connected to the machine needle rocking assembly, and a second transmission having a variable transmission ration that can be connected to the machine feed dog assembly. Additionally, the apparatus includes an actuator connected to the first and second transmission that may be activated by a machine operator for synchronously changing the transmission ratio of the first and second transmission to effect change in the machine stitch.

Abstract: In a sewing machine with a needle bar executing transverse motions and with a pressing arrangement whose foot can be lowered onto the work piece laterally with regard to its central position when the needle bar executes lateral movements, the presser arrangement and its drive connection to the needle bar is executed so that a minimal moment of inertia is exerted on the needle bar when driving the pressure arrangement and so that the pressure foot always generates a load evenly spread over the pressed surface, independent of the width of its lateral movements. For this purpose the presser foot is movable in transverse direction relative to the other parts of the pressing arrangement and it is guided parallel to the work piece surface by a guiding arrangement. The transverse movement of the presser arrangement is taken from the transverse movement of the needle bar by a driving connection.

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: In a sewing machine having a needle bar jogging frame in which a needle bar which can be driven with a reciprocating motion in its longitudinal direction is mounted, the jogging frame is in the form of a member of a parallel four-bar linkage. For this purpose the frame is mounted by way of a guide lever and a lever so as to be movable parallel to itself in the heat of the sewing machine. The lever and the guide lever are designed equal in length and arranged parallel to one another. This development creates a simply constructed jogging frame so that the needle bar and thus also the needle are always moved or displaced parallel to themselves in the jogging plane of the jogging frame, irrespective of the stitch length and irrespective of whether the sewing direction is forward or backward to produce lock stitches.

Abstract: In the process for manufacture of seat covers with honeycomb cells, a plain and folded segment of a cover material is introduced by means of a fold forming traveler into a first of several grooves of a foam plastic panel and after the traveler is retracted, the fold of cover material is sewn to the foam panel. Then, a new segment of the cover material is folded back over the seam by the traveler in the direction of the adjacent second groove and, after forming a fold, is sewn in this groove. In the seat covers produced by this process, the seams are fully concealed by the cover material.

Abstract: A sewing machine with a needle bar mounted in a rocker, has a step motor drive for the oscillation of the rocker. A memory is used in which are contained selected digital data for influencing the step motor and a control unit is inserted between the memory and the step motor for selection and conversion of the digital data into stepping pulses for the step motor. A pulse generator operating synchronously with a main shaft of the sewing machine is used for triggering the transmission of stepping pulses to the step motor. To improve the drive transmission and to avoid reactions on the step motor, the step motor is connected to a lever arm of the rocker via an eccentric transmission.

Abstract: A double chain stitch sewing machine having a feeding device with a feed dog oscillatingly movable in and opposite to the feeding direction for producing a relative movement between a workpiece and the sewing machine. It has a needle reciprocatingly driven by a crank mechanism, at which the feeding mechanism also imparts synchronous jogging movements to the needle in order to generate a needle feed movement. The reciprocatingly and joggingly driven needle cooperates with a looper oscillatingly driven by a looper drive mechanism in parallel with the feeding direction. The looper drive mechanism is formed as a six-bar-linkage-mechanism provided at the input with a stationary pivot and at the output with a stationary pivot and provided with an intermediate pivot.

Abstract: In a sewing machine, particularly an industrial sewing machine, with a needle which can be driven up and down by means of a needle bar, a feed dog for the forward transfer of the workpiece in co-ordination with the needle movement, an actual feed rate sensing device which supplies a corresponding electric signal and at least one sensor for detecting a workpiece edge, for the purpose of increasing the accuracy of the positioning of the corner stitch of a seam portion with acceptable constructional expenditure, a device is provided for displacing the longitudinal axis of the needle parallel to the sewing direction as a function of the actual feed rate sensing device on the one hand and the detection of a workpiece edge by the sensor on the other.

Abstract: A sewing device with a sewing head and a feeding device for generating a two-axis-relative motion of a constant velocity between a workpiece to be stitched wherein the sewing head has a rotary housing pivoted about an axis of rotation at the sewing head. In the housing, a needle bar including a needle is pivoted and the needle bar essentially extends about the axis of rotation. The housing further has a common drive for a thread take-up means and a crank including a jogging gear, wherein the two latter cooperate to produce a needle feed movement. The rotary housing is rotatably controlled together with a bearing bracket including a hook, in order to render possible sewing of a stitch contour, wherein the needle feed movement is tangentially guided relative to the individual sewing direction.The drive connection between the main drive shaft and the drive elements incorporated in the rotary housing are constructed of a double timing belt pulley concentrically pivoted with respect to the axis of rotation.

Abstract: An auxiliary needle is supported by a shiftable and rotatable slide rod which extends in a slightly inclined position relative to the vertical and is guided by an extension in a guide slot. The upper portion of the guide slot extends at an angle relative to the slide rod. Therefore, if moved from its rest position downwardly into its working position, the auxiliary needle performs first a combined rotary and translational motion, and then, upon penetrating a workpiece, only a straight longitudinal motion.

Abstract: An automatic sewing machine for producing a seam having a fastening seam and a tacking seam is installed with a sewing head having a bearing bracket with two bearings which are arranged at a distance from each other for receiving a reciprocating needle bar including a needle. A sewing head comprises a drive mechanism to selectably impart jogging movements to the needle bar, wherein the movements form a transmitting ratio with respect to the reciprocating movement of the needle of 1:1 or 1:2.In order to render possible a shifting of the needle jogging movement during the operation of the machine and under full load, the two bearings guidingly receiving the reciprocating needle bar are oscillatingly drivable independently of each other wherein one bearing is oscillatable at a transmitting ratio of 1:2 and the other bearing is oscillatable at a transmitting ratio of 1:1. Both bearings are drivingly connected to individual drive parts each of which is independently engageable.

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 is disclosed which is to be connected to a domestic sewing machine for converting it into one capable of sewing heavier materials and sewing materials having edgewise designs so that the designs are maintained in alignment. The converted machine can also be capable of having an adjustable amount of hook throw. This apparatus includes a member which pivotally connects a needle bar and a feed foot to the sewing machine. The apparatus also includes a member which pivots the connecting member back and forth in a feed direction and a reverse feed direction. So that the workpiece being sewn by the machine will not slip during pivoting in the reverse feed direction, the apparatus also includes a clamp element for retaining the workpiece against a workpiece supporting surface during this time. Additionally the apparatus includes a mechanism which lowers and raises a feed dog when the connecting member has been pivoted to the substantial extremes of the feed direction and reverse-feed direction.

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: An apparatus is disclosed which is to be connected to a domestic sewing machine for converting it into one capable of sewing heavier materials and sewing materials having edgewise designs so that the designs are maintained in alignment. The converted machine can also be capable of having an adjustable amount of hook throw. This apparatus includes a member which pivotally connects a needle bar and a feed foot to the sewing machine. The apparatus also includes a member which pivots the connecting member back and forth in a feed direction and a reverse feed direction. So that the workpiece being sewn by the machine will not slip during pivoting in the reverse feed direction, the apparatus also includes a clamp element for retaining the workpiece against a workpiece supporting surface during this time. Additionally the apparatus includes a mechanism which lowers and raises a feed dog when the connecting member has been pivoted to the substantial extremes of the feed direction and reverse-feed direction.

Abstract: A throat plate for a sewing machine having an above the bed feeding system, which throat plate provides for minimum drag on the work material. The throat plate is fashioned with a relief in which is situated a feed plate supported upon ball bearings for minimum friction, which feed plate is resiliently loaded to a central position. The throat plate is designed so that a presser foot of the above the bed feeding system will not impinge upon the movable feed plate and the feeding foot will impinge only upon the movable feed plate. Thus, work material captured between the feeding foot and the movable feed plate is not subjected to the usual drag from a stationary throat plate and, upon being released by the feeding foot, the movable feed plate returns to a starting position.

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.

Abstract: An electronically controlled sewing machine having the capability for lateral feeding in addition to longitudinal feeding is provided with an arrangement for effecting closed path pattern stitching. Selector switches having indicia thereon representative of the direction of sewing effected by operation of the respective switches are positioned so that the indicia visually simulates the closed path pattern.