Abstract: A connecting rod for a variable compression internal combustion engine, the connecting rod including a crank bearing eye for connecting the connecting rod with a crank shaft; a connecting rod bearing eye configured to connect the connecting rod with a cylinder piston of the internal combustion; an eccentrical element adjustment arrangement configured to adjust an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes an eccentrical element that cooperates with an eccentrical element lever, wherein the eccentrical element is configured to receive a wrist pin of the cylinder piston, wherein the eccentrical element adjustment arrangement includes at least one cylinder with a piston that is displaceably supported in a cylinder bore hole and connected with a support rod, wherein the eccentrical element lever includes two eccentrical element lever segments which are connected by at least one connecting bolt to which the support rod is pivotably connected.

Abstract: Provided is a horizontal rotary hook for a sewing machine including: an inner rotary hook including an attracted member made of metal in an outer lower surface portion; a permanent magnet that attracts the inner rotary hook; a magnet plate that accommodates the permanent magnet and is provided with a shaft hole for mounting at a center of a diameter thereof; a non-metallic outer rotary hook that accommodates the magnet plate and has a shaft hole at a center of a diameter of an inner bottom portion thereof; and a hook supporting shaft that is inserted through the shaft hole of the magnet plate and the shaft hole of the outer rotary hook, and that includes, at an upper end thereof, a flange for rotatably supporting the outer rotary hook and the magnet plate. A rotation stopper for the magnet plate is disposed to be positioned more inward than an outer circumference edge of the permanent magnet placed in the magnet plate.

Abstract: The present invention relates to a lower thread supply device for a sewing machine, comprising: a housing (100) which is fixed to a main body of a sewing machine, has a cylindrical shape in which a front side and a back side are opened along a central axis, and has a (a housing cut out portion) (110) formed by cutting the outer circumferential surface of one side; a rotation plate (200) which is connected to a power shaft of a sewing machine, has a disk shape, has a power transmission protrusion (210) formed on the front surface of the disk, and is provided at the back inner lateral side of the housing (100) to rotate; a hook body (300) which is rotatably provided inside the housing (100), has a cylindrical shape with an opened front side, a protrusion receiving part (320) formed at the back outer portion to receive the torque of the rotation plate (200) by being engaged with the power transmission protrusion (210), a bobbin mounting post (330) formed at the back inner portion, and a hook (310) that passes th

Abstract: An inner rotary hook has a needle drop hole, and side wall portions formed over the drop hole and defining a space for passage therethrough of a sewing needle. The side wall portions are located adjacent to opposite sides of the needle passing through the space and extend from a region in front of the needle to a region behind the needle. The side wall portions can abut against an upper thread, passed through a hole of the needle, near a bottom dead point of the needle. If any of two portions of the thread located forward and rearward of the needle has strayed laterally, it can abut against one of the wall portions. Consequently, it is possible to prevent the front-side upper thread portion from circling around behind the needle, but also prevent the rear-side upper thread portion from straying laterally to form a laterally-protruding loop.

Abstract: An inner rotary hook has a needle drop hole, and side wall portions formed over the drop hole and defining a space for passage therethrough of a sewing needle. The side wall portions are located adjacent to opposite sides of the needle passing through the space and extend from a region in front of the needle to a region behind the needle. The side wall portions can abut against an upper thread, passed through a hole of the needle, near a bottom dead point of the needle. If any of two portions of the thread located forward and rearward of the needle has strayed laterally, it can abut against one of the wall portions. Consequently, it is possible to prevent the front-side upper thread portion from circling around behind the needle, but also prevent the rear-side upper thread portion from straying laterally to form a laterally-protruding loop.

Abstract: A rotary hook of a lockstitch sewing machine includes at least one hook body including a cylindrical cavity and a basket freely rotatable in the cylindrical cavity, to which it is constrained by a rib, provided on the outer surface of the basket, which engages in a C-shaped race, provided in the inner wall of the cylindrical cavity of the hook body and delimited by two plane surfaces parallel to each other and by a cylindrical surface perpendicular to the plane ones, suitable to prevent axial and radial translation of the basket in the cylindrical cavity—further includes elements applying to the basket an axial pressure causing the rib of the basket to lean against one of the plane surfaces delimiting the race present in the cylindrical cavity of the hook body. Some of these elements are carried by the lockstitch sewing machine to which the rotary hook belongs.

Abstract: The present invention provides a sewing machine shuttle that allows, prior to the application of an upward-pulling force from a take-up lever and without the use of this upper-pulling force, an upper thread to be pulled from an internal shuttle while sliding through the abutment between a rotation stopping recess portion and a rotation stopping projection; prevents thread breakage and inconsistency in thread tension by avoiding resistance from the upper thread when the upward-pulling force of the take-up lever is applied; and stabilizes the action of the upper thread after it has been pulled from the inner shuttle.

Abstract: Gripper hook (1) for a lockstitch sewing machine, wherein the sewing machine comprises a vertically mounted needle (5) for an upper thread, a stitch plate and below the stitch plate a housing which houses the gripper hook (1), substantially formed into an open cylinder and rotatably mounted on a horizontal axis, a bobbin basket (4) which is concentrically supported inside the gripper hook (1) and is designed as an open cylinder for receiving a bobbin case, the bobbin case housing a bobbin for an under thread and the needle (5) in executing a stitch being brought down perpendicularly to the axis of the rotary gripper hook in front of the open part of the gripper hook (1) through an opening (11) in the wall of the bobbin basket (4) so that a gripper hook tip catches the upper thread and leads the upper thread around the bobbin basket (4), thereby forming a stitch by interaction with the under thread when the needle is brought back up, and wherein the gripper hook (1) has a cylindrical side wall (3), which is at

Abstract: An automatic dual bobbin mechanism is provided. A housing containing two unique bobbin casings and bobbins therein oriented side-by-side with the sewing needle and thread passing between the bobbin casing pair replaces the convention single bobbin configuration. The bobbin pair acts in a tag-team operation whereby one bobbin supplies thread to be stitched into a fabric while the second bobbin is simultaneously filled with thread from an external source. When the first bobbin is emptied, the bobbin pair is rotated 180.degree. inside the housing. The second bobbin, now full, supplies thread for continued stitching while the first bobbin is refilled with thread supplied by the external source. The specially designed bobbins and bobbin casings allow for automatic rethreading of the empty bobbin and cutting of the bobbin thread from external source, thus eliminating the need to manually remove the empty bobbin and assembly, replace with a full bobbin and rethread.

Abstract: A half-turn hook for positioning a needle thread loop between a needle and a bobbin at the time of stitching, the half-turn hook comprises a shuttle race body, a rotatable shuttle body, a bobbin and a shuttle race ring. The shuttle race body has a sliding surface on which a needle thread is slid in the beginning of stitching. The shuttle race ring has a cutout formed in its upper portion. In the half-hook, the surface where the shuttle body abuts against the shuttle race body and the end into which the rotating shuttle digs, in the cutout of the shuttle body race ring, is located closer to the rotating shuttle body than the sliding surface of the shuttle race body.

Abstract: A sewing machine having a projection formed on an inner shuttle of a shuttle-inner shuttle assembly to prevent the inner shuttle from being rotated in the same direction in which the shuttle is rotated, thereby providing a gap through which the needle thread passes.

Abstract: An axis of a needle is inclined with respect to an imaginary plane perpendicular to an axis of a lower shaft. The lowermost position of the needle where it comes closest to a loop taker is spaced from the loop taker in the axial direction thereof in proportion to the degree of inclination of the axis of the needle. As a result, the length of a bobbin accommodated in the loop taker can be extended along the axis thereof, thereby permitting the amount of thread loaded on the bobbin to be increased. The amount of thread drawn by a needle thread take-up may remain the same and need not be changed.

Abstract: Arrangement in a sewing machine shuttle for holding in place a hook ring (10) in a driver (19) consisting of three parts: an inner part (23), an intermediate part of spring material (24) and an outer part (25). The elastic intermediate part keeps the hook ring in a determined position but allows, at the same time, the passage of the upper thread without any considerable obstacle.

Abstract: A fully rotating hook includes an inner bobbin case, an outer loop taker mounted about the bobbin case, the loop taker having a track groove formed therein, a rotating member for rotating the loop taker such that relative rotation occurs between the loop taker and the bobbin case, and a stopper member for preventing rotation of the bobbin case with the loop taker while the loop taker is rotating. The track groove of the loop taker is formed by at least one wall therein which is coated with a layer of synthetic resin material having a small coefficient of friction to reduce friction between a track projection member on the bobbin case and the track groove of the loop taker.

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: A rotary looptaker includes a looptaker body rotatable about a vertical axis and a bobbin case restrained from rotary motion with the looptaker body. A plurality of annular protrusions are provided on a flange of the bobbin case so as to extend in a circumferential direction of the bobbin case and are in engagement with a flat surface formed on a raceway of the looptaker body. When the looptaker body is rotated, the bobbin case slides relative to the looptaker body through a very small contact area between the annular protrusions and the flat surface, thus reducing sliding friction between the looptaker body and the bobbin case. Accordingly, noise and vibration are decreased when a rotation restraining projection of the bobbin case contacts a restraint element secured to a machine frame.

Abstract: A zigzag sewing machine includes a needle hole member having a round needle hole of a diameter slightly larger than that of a stitching needle. The needle hole member engages a laterally elongated hole in a needle plate and is swingable along the latter. A base member is mounted coaxially with a loop taker and is rotatable relative to the loop taker. The needle hole member is pivoted to the base member for relative vertically swinging movement. A lever swingably mounted on the machine housing engages with the needle hole member, and a cam rotated in synchronism with the vertical reciprocation of the needle is in engagement with the swinging lever. A stepping motor is operatively connected to the needle to reciprocate the needle laterally in the elongated needle plate hole, and the motor is also operatively connected to the base member to reciprocate the base member.

Abstract: A sewing machine has a bed housing having a needle penetrating hole at one end thereof, an arm housing rising from the other end of the bed housing and extending to the one end of the bed housing over the bed housing, a laterally-long needle bar arm rotatably held in the arm housing and having a needle at the front end thereof, and a drive unit for swinging the needle bar arm with respect to the bed housing accommodated in the bed housing. The arrangement of the laterally-long needle bar arm and the drive unit accommodated in the bed housing, can effectively reduce the overall height of the sewing machine. It further reduces the weight and cost of the sewing machine, since no conventional material, such as cast iron having a heavy weight is used and die cast aluminum associating with a higher cost, may be employed for producing the arm housing.

Abstract: A full rotary loop taker assembly comprising a loop taker (11) rotatably held in a loop taker support (1), and a driver (3) for rotatively driving the loop taker as it is rotated around a rotative axis (4) intersecting the rotative axis (12) of the loop taker. The loop taker is formed on its bottom surface wall (16) with at least three angularly spaced engaging holes (17a, 17b, 17c). The driver is formed with at least three angularly spaced projections (10a, 10b, 10c) adapted to be received in the engaging holes. During the rotation of the driver, the projections are successively received in the corresponding engaging holes in such a manner as to ensure that there is always at least one projection which has been received in the corresponding engaging hole. Further, to allow passage of an upper thread loop (23), in a predetermined angular range in the rotation of the driver the respective projections are ready to escape from the corresponding holes.

Abstract: A fully rotating hook includes an outer member or rotary loop taker having a track groove therein and an inner shuttle member or bobbin case a projection extending into the groove. A spaced relation between the track groove and the projection is maintained by feeding compressed air into a clearance therebetween. The compressed air is fed through a plurality of air holes opening into the track groove to direct air jets to upper, lower and radially outermost surfaces of the projection on the bobbin case. Furthermore, the loop taker is rotated on a hollow shaft which has an air passage therethrough for feeding compressed air to the plurality of air holes which open into the track groove of the loop taker.

Abstract: A thrust washer on the looptaker shaft of a sewing machine between the underside of a hook body and the top end of a bushing wherein the looptaker shaft is rotatable is provided with thread engageable peripheral flanges, one of which is disposed to extend upwardly into a recess formed in the hook body and the other one of which extends downwardly over the top edge of the bushing.

Abstract: A method is disclosed for fabricating and assembling a sewing machine hook shaft and hook body by which the required critically accurate shapes may be attained in a particularly cost effective manner.

Abstract: A needle guard of a double lockstitch hook of a sewing machine in which the needle guard is fastened at the rotatably pivoted hook body and the free end of the needle guard rests on a supporting screw. By turning the screw the position of the needle guard with respect to the beak of the hook may be adjusted. The procedure of adjustment may be carried out under actual conditions without taking the hook out of the sewing machine.

Abstract: A hollow looptaker shaft which has a spindle rotatable therein and which is of a material susceptible to local deformation under pressure is fitted with a steel sleeve that is prevented from rotating relative to the shaft, and a gear for use in rotating the shaft is affixed to the sleeve with a set screw.

Abstract: A double-lock-stitch sewing machine has a reciprocating needle forming an upper-thread loop with the aid of a rotary gripper assembly. The loop is carried by and formed by a main hook or point of the assembly around a stationary bobbin to engage a bobbin thread in a double-lock-stitch. A counter hook or counter point on the gripper assembly, which normally serves only to control movement of the loop from the main point, is formed on an underside with an auxiliary hook portion for drawing an extra thread length from the supply during each stitch and thus inhibiting bunching of the workpiece.

Abstract: A sewing machine bobbin for a vertical axis hook is provided with a top and a bottom flanged section, and a fastener which both holds the sections together and is the driven member of a clutch through which the bobbin may be driven for bobbin winding.

Abstract: A rotary hook and bobbin assembly for a lock-stitch sewing machine. The bobbin has no case but has a flat end plate and a convexly curved end plate. The bobbin holder has a post with a means for locking the bobbin and a relatively wide undergroove in its wall for adjusting tension.

Abstract: A sewing machine hook is provided with a combined needle guard and hook beak which is mounted in the rim of a hook so as to cause the guard to be engaged by a needle when the path of rotation of the hook beak, and the combined needle guard and hook beak to be pivoted into a position preventing the hook beak from engaging the needle.

Abstract: A sewing machine hook is provided with a hook body which can be adjusted relative to a drive shaft both along a radial line extending from the axis of the shaft through the hook beak and circumferentially about such axis to properly position the hook beak for seizing a loop of thread from a sewing needle.

Abstract: A throat plate having a anti-haloing member attached thereto to separate the work limb of a loop of needle thread from the take-up limb during the setting of a stitch thereby preventing the work limb from being drawn up through the material being sewn by frictional interengagement with the take-up limb.

Abstract: A light detector is supported in a mask box which extends into the cavity accommodating the looptaker with an edge of the surface adjacent the looptaker and upstream to the air currents generated by the looptaker closer to the looptaker than an edge downstream in order to discourage lint build up on the adjacent surface. A light source is fashioned with a lens projecting into the cavity accommodating the looptaker similarly to discourage lint build up.

Abstract: This disclosure relates to needle guards for rotary loop takers in sewing machines and has its purpose prevention of interference between the needle and the loop seizing beak of the rotary loop taker during the sewing operation. A needle guard is provided which takes the form of a rib member formed in the bottom wall of the rotary loop taker which rib member is spaced from the vertical side wall of the cup-shaped rotary loop taker. The rib member is relatively thin and may be said to be resilient. Means are provided for biasing the rib member toward and away from the vertical side wall of the rotary loop taker in order that the rib member may be adjusted relative to the reciprocating path of the needle so that the needle will be deflected away from the loop seizing beak of the rotary loop taker upon penetration of the fabric by said needle and thereby prevent a scoring of the loop seizing beak or a breakage of the needle.

Abstract: A rail-bearing for the shuttle in a shuttle type sewing machine in which the shuttle housing is provided with a circular rail formed to mate with a circular groove in the shuttle. This rail-groove combination is so arranged as to deter jamming of the shuttle by thread or errant bits of debris. This rail-bearing has inherent high speed capabilities and is easy to lubricate and to manufacture.

Abstract: A knitting machine capable of forming filaments of yarn, thread, and the like into a loop-in-loop arrangement includes a plurality of rotary needles which are axially spaced for rotation about a common axis and have at least two circumferentially spaced hook portions. As a needle is rotated, a hook captures a segment of filament being fed to the vicinity of the needle and pulls it into a loop. Upon further rotation, the circumferentially adjacent hook captures another segment of filament and pulls it into a loop through the previously formed loop which is still carried by the needle. As the needle continues to rotate, the first formed loop is cast off the needle by slipping out of the hook in which it is captured and this hook captures another segment of filament to start another cycle.

Abstract: There is described a device for unwindng thread by means of which the bobbin can easily rotate about the pin when a pull is exerted on the thread, but which stops the bobbin very rapidly when said pull on the thread stops, in such a way that the thread is thus no more unwound. The cross-section of the pin when considered at a right angle to the lenthwise direction thereof and the inner cross-section of the bobbin sleeve, also as considered at a right angle to the lengthwise direction thereof, at least where the sleeve and the pin engage one another, are so selected as to make possible a sidewise movement of the bobbin relating to the pin and at least where the sleeve and the pin engage one another, the one cross-section is circular while the other cross-section has a shape which is substantially different from a circular shape.

Abstract: This disclosure relates to needle guards for rotary loop takers in sewing machines and has for its purpose prevention of interference between the needle and the loop seizing beak of the rotary loop taker during the sewing operation. A needle guard is provided which is substantially annular and open ended and is resiliently supported within the body of the loop taker. One leg of the needle guard is disposed in the region of the loop seizing beak of the loop taker and in the region of the needle path so that the needle if proceeding toward the loop seizing beak upon penetration of the fabric, will be deflected away from the loop seizing beak and toward the center of the loop taker body. An adjustable anchoring means is provided for the one leg of the needle guard for adjusting the relative position of said one leg relative to the loop seizing beak.

Abstract: The rotary hook of a sewing machine is provided with a beak portion which extends substantially tangentially outwardly away from the circumferential wall of the rotary hook to capture the needle thread loop at new point radially outwardly of the rotary hook thereby allowing for a shorter needle stroke so that the tip of the needle does not penetrate into the bobbin supporting basket.