Abstract: A needle bar drive apparatus for a sewing machine includes a dedicated drive source (16) for driving a needle bar (3) of the sewing machine to move up and down. When a sewing operation is to be performed, a control section (160) controls the drive source to cause the needle bar to move up and down within a predetermined stroke range, but, when no sewing operation is to be performed, the control section controls the drive source to cause the needle bar to retreat to a predetermined evacuation position set above a top dead center in the predetermined stroke range. The control section is also capable of varying a timewise pattern of the upward and downward movement of the needle bar within the predetermined stroke range. Thus, it is possible to secure an increased space between the lower end of the needle bar and the upper surface of a sewing machine table (6) during a non-sewing period while limiting the stroke of the needle bar to a necessary minimum during a sewing period.

Abstract: There is provided a needle bar driver assembly for an overlock sewing machine having a needle for penetrating a material to be sewed and a needle bar for securing the needle thereto. The needle bar driver assembly includes a main shaft, a floating pivot, and a linking mechanism. The main shaft provides an oscillating motion. The linking mechanism is coupled to the main shaft and to the floating pivot, and transfers the oscillating motion of the main shaft to the needle bar while pivoting on the floating pivot.

Abstract: A sewing machine is provided having an automatic bobbin loader. The automatic bobbin loader includes a hook assembly mounted beneath the sewing plane having a bobbin receiver. The hook assembly is driven by a drive shaft, and is moveable from a first, operating position, to a second, loading position. A bobbin loader is mounted adjacent to the hook assembly in the second position. The bobbin loader includes a suction tube that removes any remaining bobbin core. The bobbin loader then loads a replacement bobbin from the bobbin loading assembly into the bobbin receiver, prior to the hook assembly being returned to the operating position. Additionally, in order to sew through thick material, the needle is carried by a needle carriage which moves in time with the material being sewn to maintain the needle generally vertical throughout the time it is in the material being sewn.

Abstract: In a chain stitch sewing mechanism with a sewing head movable parallel to the sewn material plane, including a needle rod with a needle drive for reciprocating a thread carrying needle, a catcher drive for reciprocating a needle shaped thread catcher with an open catching hook. The needle and thread catcher have movement paths forming a sharp angle with one another whose apex lies beneath the sewn material plane and the needle and catcher being so controlled such that a loop formed by the withdrawal of the needle is caught by the thread catcher and pulled through the material. A thread puller on a movable thread arm is moved towards the thread catcher and cooperates with the thread catcher for deflecting the loop hanging off the thread catcher at an angle to the movement path of the thread catcher toward the side opposite to that of the hook opening.

Abstract: A quilting machine including: a frame to support at least one pair of elongated roller members, the roller members are spaced apart and freely rotating and adapted to support quilting fabric material disposed therebetween and wound around the roller members, the rotation of the roller members enabling the material to be rolled towards and away from the sewing arm of a sewing machine, sliding track means adapted to support the sewing machine, the track members slidable in a directional plane parallel to and perpendicular to the roller members, quick release braking means adapted to brake the rotation of the roller members, wherein in use, in co-operation with the sliding track means, and by applying and releasing the braking means, the direction of rotation of the roller members can be controlled and material can be rapidly rolled towards or away from the sewing machine to enable continuous stitching of indefinite length to be sewn in either direction perpendicular to the roller members irrespective of the dep

Abstract: A sewing machine including a sewing machine upper portion with a frame, a needle rod and a sewing foot rod, which rods are guided in the frame for back and forth movement parallel to one another, a rack connected with each of the rods and which racks are driven by separate pinions driven by separate electric motors. These motors and possibly other motors for positioning other parts of the sewing machine are separately controlled independently of one another by a program controlled control unit so that the movement of needle road and of the sewing foot rod can be independently program controlled during a sewing procedure.

Abstract: There is provided a needle bar driver assembly for an overlock sewing machine having a needle for penetrating a material to be sewed and a needle bar for securing the needle thereto. The needle bar driver assembly includes a main shaft, a floating pivot, and a linking mechanism. The main shaft provides an oscillating motion. The linking mechanism is coupled to the main shaft and to the floating pivot, and transfers the oscillating motion of the main shaft to the needle bar while pivoting on the floating pivot.

Abstract: There is provided a needle bar driver assembly for an overlock sewing machine. The overlock sewing machine has a needle for penetrating a material to be sewed, a needle bar for securing the needle thereto, and a throat plate for allowing the needle to pass there through. The needle bar driver assembly includes a needle bar connecting link assembly for driving the needle bar. The needle bar driver assembly further includes an oscillating needle bar driving assembly for driving the needle bar connecting link assembly and for raising said needle bar connecting link assembly such that the needle is more than 18 mm above the throat plate.

Abstract: A sewing cartridge includes a cassette body, a hollow needle that can pass through a work cloth, a spool around which a thread to be supplied to the hollow needle is wound, a needle cover that covers at least a tip of the hollow needle, and a coil compression spring that urges the needle cover to a cover position where the needle cover covers the hollow needle.

Abstract: An improved chain stitch sewing machine that includes a stitch skip mechanism that is activated by the sewing machine operator such that the operator may cause the sewing machine to skip stitches as desired.

Abstract: A sewing machine includes a needle bar driving mechanism for vertically moving a needle bar by rotation of a main shaft, a needle thread take-up driving mechanism for vertically moving a needle thread take-up by rotation of the main shaft in phase with vertical movement of the needle bar, a mounting member on which the needle bar driving mechanism and the needle thread take-up driving mechanism are mounted, and a machine frame supporting the mounting member. The mounting member has two sides provided on the left and right of the needle bar driving mechanism and the needle thread take-up driving mechanisms respectively. The mounting member is supported in one of the sides by the main shaft, a rotating shaft rotated with the main shaft or a bearing member for the main shaft or the rotating shaft so that the mounting member is rotated relative to the machine frame and the main shaft or the rotating shaft.

Abstract: A quilting machine is provided having at least one set of single needle stitch forming elements for forming chain stitched patterns on a thick multilayered material such as a mattress cover. The machine is preferably web-fed, with a panel of the continuous web being clamped and held stationary on a frame. The stitch forming elements include a needle and a looper mounted on separate heads that are independently moveable on a bridge transversely relative to the panel, which is moveable longitudinally relative to the frame. The bridge is longitudinally moved by a servo and the heads are transversely moved on the bridge by separate servos. The stitching elements on each head are driven by separate servos. A controller drives the servos to chain stitch patterns and differentially move the heads transversely to account for transverse needle deflection. The drives of the needle and looper are phased to compensate for longitudinal needle deflection. The controller determines or predicts needle deflection.

Abstract: A sewing machine has a needle bar up/down moving mechanism, a needle bar oscillating mechanism, a needle bar interrupting mechanism, a thread tension adjusting mechanism, and a thread tension releasing mechanism. The sewing machine further includes a driving mechanism that transmits a driving force of an electric motor to the needle bar oscillating mechanism, the needle bar interrupting mechanism and the thread tension releasing mechanism. The driving mechanism comprises a first cam and a second cam which are driven by the electric motor. The first cam has an oscillating cam face that controls the needle bar oscillating mechanism and an interrupting cam face that controls the needle bar interrupting mechanism. The second cam has a releasing cam face that controls a thread tension releasing mechanism. Therefore, the needle bar oscillating mechanism, the needle bar interrupting mechanism and the thread tension releasing mechanism can be driven by a common electric motor.

Abstract: A driving mechanism for a sewing machine includes a rotatable shaft coupled to one or more needles for moving the needles upward and downward in a reciprocating action. A rotary looper is rotatably secured to the sewing machine at a vertical axle and is coupled to the shaft for allowing the shaft to actuate the needles and the rotary looper simultaneously. A rod is vertically secured in the sewing machine and coupled to the rotary looper for rotating the rotary looper. Two bevel gears are secured to the rod and the shaft for allowing the shaft to rotate the vertical rod.

Abstract: A method and apparatus for stitching a label to material in which the material and label are joined face side down rather than face side up. The label is held face side down with a clamp and a panel is held over the label by a clamp. The label and panel are joined by a sewing machine. Further, a mechanism is provided for activating a thread knife of the sewing machine at such a time that the bobbin thread only is cut. A masking mechanism is provided for masking electronic signals of the sewing machine that would otherwise cause the machine to reset at a normal needle height, so that a sewing operation can be stopped with a needle at a maximum clearance position. Pneumatic cylinders and linkage are provided for raising the needle and presser foot at the end of a stitching operation.

Abstract: An embroidering machine having a plurality of embroidering heads attached to a longitudinally extending carrier and each having a needle drive mechanism for an embroidering needle that is moveable in a vertical plane in the respective embroidering head. Each needle drive is connected to a driven main shaft that is guide through the embroidering machine parallel to the longitudinally extending carriers. For complete mass compensation, each drive arrangement of the embroidering head comprises an externally toothed gear wheel disposed on the driven main shaft and a second externally toothed gear wheel disposed on a compensating shaft oriented parallel to the main shaft.

Abstract: A needle bar stopper is provided in a sewing machine having a main shaft and a needle bar which moves vertically upon reception of a driving force from the main shaft. The needle bar stopper comprises a transmission prohibiting unit, including a needle bar stopping solenoid, which prohibits transmission of the driving force from the main shaft to the needle bar and a braking unit, including a needle bar stopping solenoid, which applies a braking force to the needle bar when transmission of the driving force is prohibited by the transmission prohibiting unit. The needle bar stopper can stop the needle bar reliably by use of the braking unit.

Abstract: A quilting machine is provided having at least one set of single needle stitch forming elements for forming chain stitched patterns on a thick multilayered material such as a mattress cover. The machine is preferably web fed, with a panel of the continuous web being clamped and held stationary on a frame. The elements include a needle and a looper mounted on separate heads that are independently moveable transversely on a bridge, which is moveable longitudinally on the frame. The bridge is longitudinally moved by a servo and the heads are transversely moved on the bridge by separate servos. Each head is driven by a separate servo. A controller drives the servos to chain stitch patterns and differentially moves the heads transversely to account for transverse needle deflection. The drives of the needle and looper are phased to compensate for longitudinal needle deflection.

Abstract: A counter-weighted eccentric or crank is clamped to an end of the upper drive shaft. A link is pivoted between the eccentric and an end of a short leg on a V-shaped rocker. The base of the V-shaped rocker is pivoted on a fixed pin. The long arm of the V-shaped rocker is connected to a needle bar to drive the needle bar up and down. The movement of the needle bar carries a main needle and thread through a workpiece to make stitches in the cloth.

Abstract: A sewing machine including a head portion including a needle bar, the needle bar being for mounting a needle threaded with a needle thread; a principal shaft; a sewing machine motor for driving the needle bar via the principal shaft; a bed portion including a loop taker for taking a thread loop of the needle thread in cooperative operation with the needle; a loop taker drive shaft connected to move in association with the loop taker; a drive motor for driving the loop taker drive shaft independently of the principal shaft; a first detection unit for detecting a rotation condition of the principal shaft and outputting a first detection signal accordingly; a second detection unit for detecting a rotation condition of the loop taker drive shaft and outputting a second detection signal accordingly; and a synchronization control unit for controlling at least one of the drive motor and the sewing machine motor based on the first detection signal from the first detection unit and the second detection signal from the

Abstract: A sewing machine including a head portion including a needle bar, the needle bar being for mounting a needle threaded with a needle thread; a principal shaft; a sewing machine motor for driving the needle bar via the principal shaft; a bed portion including a loop taker for taking a thread loop of the needle thread in cooperative operation with the needle; a loop taker drive shaft connected to move in association with the loop taker; a loop taker drive unit including a loop taker drive motor for driving the loop taker drive shaft independently of the principal shaft; a synchronization control unit for controlling at least one of the loop taker drive motor and the sewing machine drive motor so that the loop taker and the principal shaft rotate in synchronization; and an offset adjustment unit provided to the synchronization control unit and for adjusting an amount that the phase of the loop taker is offset from a reference phase offset amount preset for the loop taker with respect to the principal shaft.

Abstract: A sewing machine which includes a main shaft motor for driving a main shaft; a needle bar for moving up and down by rotation of the main shaft motor; a thread exchanging mechanism, having a swinging member swingable by rotation of the main shaft motor, for exchanging a thread by moving a thread barrel having an opening through which a thread is passed, from a standby position to an exchange position; and a controller for controlling the rotation of the main shaft motor.

Abstract: An apparatus (10) is provided for tufting an embroidered rug using an automated tufting machine and an X-Y gantry, wherein the tufting needle to rotate without creating adverse affects in the tufted pattern. A tufting head (42) is carried by an upper gantry (12) and is moveable along the length thereof in the Y-direction via a tufting head motor (66). The upper gantry (12) and a lower gantry (30) are moveable in the X-direction via two upper gantry motors (20). The tufting head (42) includes a cylinder (46), a piston (50), a needle (52), and a blade (54). The cylinder (46) is secured to a frame (44) via at least one pillow block (58) defining a cylindrical opening (60) dimensioned to slidably receive the cylinder (46). The piston (50) carries the blade (54) and is configured to reciprocate within the cylinder (46). The needle (52) is secured to the distal end of the cylinder (46) and defines a centrally disposed through opening (53). The blade (54) is coaxial with the longitudinal axis of the cylinder (46).

Abstract: A needle drive for a multi-needle stitching machine is provided, having a needle bar supporting needles, which is suspended on pairs of elbow joint levers. The elbow joint levers are engaged by a common push rod, which is movable back and forth by a drive. The needle bar is supported on vertical guides and is moved up and down by the pushing movements of the push rod. The needles of the stitching machine reach the lower point of reversal when the elbow joint levers are completely stretched, that is, when the elbow joint levers are disposed parallel with each other. In this manner, the lower point of reversal is clearly determined, and remains the same, irrespective of whether the lift of the push rod is increased or decreased in order to adjust the lifting of the needles from the sewing material.

Abstract: Disclosed is a multi-head sewing machine having an improved structure for driving a main shaft and a lower shaft for driving needle bars and thread take-up levers so as to prevent distortion of these shafts, in turn, variation of stitch performance in the respective heads from occurring.

Abstract: A portable lock stitch sewing machine includs a driving mechanism, a transmitting mechanism and a number of guiding mechanisms. The function of the driving mechanism is to transfer a battery power to pivotally connected members to make them move as required by a user. The transmitting mechanism then transmits the power of the battery to related members to fulfill the sewing performance and the number of guiding mechanism are used to ensure the tension on threads.

Abstract: A drive assembly for reciprocating connecting links includes a single, main drive shaft and alternating, counterrotating and direct individual drive assemblies. The drive assembly is particularly adapted for use in devices such as carpet tufting machines which require high speed reciprocation of connecting links and push rods. The drive assembly is designed to counterbalance undesirable multidirectional reciprocating forces generated by the drive assembly itself and other machine elements. The drive assembly, therefore, operates at high speeds while reducing overall machine vibration.

Abstract: A hand-held mending gun for tufting stitches into a backing material has a hollow needle reciprocably driven axially and oscillated laterally so as to form stitches in a backing material laterally offset from other stitches. Zig-zag backstitches may thus be formed as may other laterally offset stitches. A crank drives a needle carrier in a reciprocating path extending longitudinally along the axis of the needle. The elongated path is defined by constraining the needle carrier to move within a slot in a pivotally mounted yoke member having a pair of spaced apart tines disposed about a cam so that rotation of the cam oscillates the yoke member about the pivot. The cam is driven by gears such that it may make one cycle For each two cycles of reciprocation of the needle to form alternate laterally offset stitches. Cams of various configurations may be utilized so that more than one stitch may be provided at each lateral side.

Abstract: A shuttle hook driving device for driving a shuttle hook having a beak disposed between a needle drop position and a bobbin thread lead-out point of a bobbin in a sewing machine which includes a main shaft, a needle bar, a thread take-up lever, and a conversion mechanism for converting a rotation of the main shaft into an oscillating motion, the shuttle hook driving device comprises: a counter balance connected to the needle bar and the thread take-up lever, the counter balance being mounted on the main shaft such that the counter balance is displaced a predetermined angle with respect to the main shaft as compared with a standard sewing machine; an output shaft received the oscillating motion from the conversion mechanism, the output shaft being connected to the conversion device in right-left inverted relation with respect to an axis thereof as compared with the standard sewing machine, using an uppermost point of the needle bar as a reference; and a driver connected to the output shaft, for driving the shu

Abstract: A needle bar stop device for a sewing machine in which a needle bar arm is separated into two parts, a first arm on a main shaft side, the rotation of which is controlled by a sub-shaft and a second arm on the needle bar side which is capable of rotating about the sub-shaft. An extended part is provided on either the first armor the second arm extending along the side surface of the other arm, and an insertion hole is formed in the extended part. An engaging hole is formed in the other arm so as to be capable of aligning with the insertion hole. A movable engaging member fitting in the insertion hole is part of a coupling mechanism that is selectively operated to cause the engaging member to engage with and disengage from the engaging hole.

Abstract: A pneumatic sewing machine having a housing mounting a presser foot and needle bar for reciprocatory movement and a bobbin for rotary movement, a rocker arm pivotably mounted on the housing having one end attached to the needle bar and the other attached to a pneumatically actuated piston, a rack and pinion operatively connected to the rocker arm for rotating the bobbin, and valve means for controlling delivery of pressurized air from a source to the piston to bring the needle bar proximate the bobbin to perform a stitching operation.

Abstract: This invention relates to a method and apparatus for electronically gearing the sewing parts of a sewing machine, and more particularly it relates to electronically gearing the bobbin to the needle to eliminate the necessity of their physical coupling through mechanical linkages and drive shafts. Servo motors provide torque to the needle, bobbin, and various other sewing parts of the sewing machine which require concerted movement. A computer uses servo motor positional information to calculate motion commands that are sent to the needle and bobbin servo motors, thereby enabling electronic gearing of the bobbin to the needle so that each moves substantially in unison. Motion commands sent to servo motors attached to various other sewing parts of the sewing machine are based on servo motor positional information to enable the sewing parts to move in concert with the needle and bobbin.

Abstract: A dry sewing machine, or a sewing machine which can be operated without oiling. The machine of the preferred embodiment is particularly adapted for making a type 401 two thread chain stitch, used in commercial sewing operations. In addition to employing sealed bearings, novel spreader and rocker frame assemblies are employed.

Abstract: A needle-bar driving device of a sewing machine, for oscillating a needle bar supporting at a lower end thereof a sewing needle, in the axial direction of the needle bar, including a dead-position changing apparatus for changing at least one of an upper and a lower dead position of the needle bar.

Abstract: This disclosure relates to a demountable rotary cam with upper and lower portions that can be coupled and securely mounted on a rotatable shaft, and can also be demounted and interchanged with other similar eccentrics having different throws. The demountable rotary cam is particularly suited to vary the stroke of the needle bar in a tufting machine and an adjusting means is provided to maintain the proper relationship between the needles and loopers over a range of strokes.

Abstract: A tufting machine having individual crank assemblies for reciprocating the push rods which carry the needle bar. Successive crank shafts aligned with each other and parallel to two main drive shafts which are rotated in opposite directions. Gears on the main drive shafts respectively transfer power from the two drive shafts so as to rotate each successive crank shaft in a direction opposite from the direction of rotation of the preceding crank shaft. The connecting rods connected to the crank assemblies thus are thrown outwardly in opposite directions as the crank shafts are rotated, so as to balance the machine. Additional counter-balance weights are provided on the main drive shafts.

Abstract: A transmission mechanism includes a transmission gear shaft having a speed reducing gear on one end driven by a DC motor via a driving gear and a transmission gear on an opposite end meshed with a driven gear on an eccentric gear shaft, which has an eccentric axle coupled to a reciprocating block via a crank and driven to reciprocate the reciprocating block causing it to alternatively move the needle arm of a mini-sewing machine up and down in performing the process of stitching.

Abstract: An industrial sewing machine comprises a supporting frame supporting a main driving shaft rotatively driving two driven shafts, on one of the driven shafts being keyed cam members for reciprocally driving in a horizontal plane a horizontal needle bar, as well as grippers for feeding with fabric operating hook elements, the other driven shaft operating a vertically displaceable vertical needle bar arranged downstream of the horizontal needle bar, the spacing of the horizontal and vertical needle bars being so designed that the needles supported thereby can make simultaneously seaming lines.

Abstract: A sewing machine needle receiving and transferring arrangement wherein a clamp device for the needle is provided in each of the needle bars so as to engage or disengage the needle with or from each of the needle bars. Such clamp device engages or disengages depending on the energized or deenergized mode of a solenoid.

Abstract: An automatic sewing machine having a needle-bar drive device for reciprocating a needle bar carrying a needle, a feed device for producing a relative movement between the needle bar and a work fabric, a feed control device for controlling the feed device according to stitch data indicative of needle positions, and a needle-bar jump device for disconnecting the needle bar from the needle-bar drive device and for holding the needle bar at a predetermined position above the fabric.

Abstract: A sewing machine incorporates a needle bar disconnecting mechanism (3) and a thread cutting mechanism (9). The needle bar disconnecting mechanism (3) is interposed between an arm spindle (2) and a needle bar (4), which normally transmits rotations of the arm spindle (2) to the needle bar (4) to vertically move the latter up and down but disconnects the needle bar (4) from the arm spindle (2) to stop the vertical movement of the needle bar (4) when actuated. The thread cutting mechanism (9) cuts threads at the termination of stitching. A rotational phase detecting mechanism (11) is provided for detecting a rotational phase of the arm spindle (2). An electronic control circuit (12) actuates the needle bar disconnecting mechanism (3) when the rotational phase detecting mechanism (11) detects that the arm spindle (2) has reached a predetermined rotational phase after the thread cutting mechanism (9) is actuated.

Abstract: In a sewing machine, a needle-bar is slidingly mounted in two bearings, the external surface of each of which has a spherical profile. The bearings are pivotably engaged in respective seats of complementary profile provided in a fixed support, for an upper bearing, and in a movable lever, for a lower bearing. This lever is alternately pivoted into two opposite positions under the action of a stepper motor. The motor drives the movable lever by engagement of a pinion with peripheral gear teeth carried by the movable lever.The motor, the fixed support, the movable lever, the bearings and the needle bar form a self-contained and detachable assembly.

Abstract: A sewing machine with a pivotable stitch formation unit is provided such that it is possible to form a straight stitch or a zigzag stitch seam without loop stitches occurring on the fabric. The fabric is displaceable under the needle without rotation because of a pivoting arrangement of the head and the shuttle holder. The arrangement allows the sewing machine to be switched over from a straight stitch to a zigzag stitch operation due to the adjustment of the oscillation frequency of the needle bar holder relative to the oscillation frequency of the needle bar by means of a multistep shifting gear.

Abstract: In a threading apparatus on a sewing machine, the drive source is driven and transmits drive force through a transmission to a moving board. The moving board thus lowers and contacts the actuating rod. The actuating rod in turn lowers, thereby lowering and further rotating the threading rod. The threading hook enters the needle eye. The needle is thus threaded. The moving board is provided separately from the actuating rod. When the drive source or the transmission breaks, the actuating rod can be lowered separately from the moving board. Specifically, without driving the drive source, the actuating rod can manually be lowered, so that the threading rod can lower and rotate, and the threading hook is inserted into the needle eye. Since the needle can thus manually be threaded, the position adjustment in the assembling the threading apparatus is facilitated.

Abstract: A sewing machine has a sewing head with a rotary housing, in which a needle bar is arranged, which is slidably supported. A 1st partial transmission unit and a 2nd partial transmission unit are provided as a drive and have a total transmitting ratio of 1. In order to make the moment of inertia of the rotary housing as small as possible, the transmitting ratio of the 1st partial transmission unit is smaller than 1 and the transmitting ratio of the 2nd partial transmission unit is correspondingly larger than 1.

Abstract: A sewing machine having separate drives for the needle bar and looper includes initialization routines to place the needle bar and looper in predetermined starting positions prior to the start of a sewing operation. Position detectors comprise photoelectric cells and interrupters mounted on the motor shafts of the needle bar drive motor and the looper drive motor. The position of the needle bar is initialized first, by movement in a reverse direction, if necessary, to prevent undesired engagement with the looper. Thereafter, the looper position is initialized. A sewing operation is enabled once the needle bar and looper are set in predetermined starting position.

Abstract: A sewing machine comprising a threading device and a needle-bar raising means. A threading switch is operated and a sewing machine motor is stopped. Subsequently, thread is passed onto a linkage, a needle bar is disconnected from an arm shaft, and the needle bar is raised to a given position. After the needle bar is set in its uppermost position, thread stretched out from the linkage 38 to the front of an eye in a needle is passed through the eye in the needle. If the end of thread is manually held in front of the eye in the needle to stretch out prior to threading operation, the needle bar does not lower, thus enhancing operational safety and preventing thread from loosening.

Abstract: A sewing machine has a vertical needle bar pivotable about a point thereon adjacent the upper end and moveable up and down. A sewing needle is detachably secured to the lower end of the bar and has an eye adjacent its lower end. The machine has an adjustable stitch width and, during its operation at a preset width, satisfies the requirement that the eye must be continuously properly positioned with respect to the machine hook at all times. The eye is vertically aligned with the hook point when the eye is in proximity of the hook, so as to insure reliable stitch formation at any selected stitch width. An arrangement for maintaining such proper positioning employs a first stop secured to the bar at a first location thereon intermediate its ends. A second stop is secured to the bar at a second and lower position intermediate its ends. A member is slidable along and is disposed on the bar in the space between the two stops. A spring is disposed on the bar between the first stop and the member.

Abstract: In a sewing machine, an oscillating cradle has two bearings in which a needle bar is slidingly mounted. An external surface of each bearing has a spherical profile by which it is pivotingly engaged in a respective seat of complementary shape provided in a first arm of the cradle, for an upper bearing, and in a second arm, for a lower bearing. A resilient leaf spring, in the form of a U, exerts an axial pressure on both the upper bearing and the lower bearing, to maintain them in their seats in alignment with one another.

Abstract: A zigzag sewing machine comprising a needle bar lateral drive device, a needle bar lateral drive steppping motor for controlling the needle bar drive device, a feed device for driving a feed dog back and forth, a crossfeed device for driving the feed dog from side to side, and a crossfeed stepping motor for controlling the feed drive device. The sewing machine can sew beautiful pattern stitches and neat stitches by setting up amplitude according to the minimum feeding pitch of the feed dog which is smaller than the minimum moving pitch of the needle bar. Since the needle location is determined by cooperation between the needle bar and the feed dog, the maximum lateral moving width of the needle is shorter than amplitude and the needle can be securely and accurately driven even at a high sewing speed.