Abstract: A directly motor-driven structure of a sewing machine, including: a middle rotary shaft pivotally mounted in a middle section of the housing between the upper and lower driving shafts. A first transmission mechanism connected between the lower driving shaft and the middle rotary shaft. A second transmission mechanism connected between the upper driving shaft and the middle rotary shaft. The first transmission mechanism is spaced from the lower stitching needle by a first length. The second transmission mechanism is spaced from the upper stitching needle by a second length. The second length is smaller than the first length, whereby the sewing machine is formed with a recessed installation space adjacent to the second transmission mechanism. A driving motor is installed in the recessed installation space and directly fixedly connected with the upper driving shaft.

Abstract: A structure of a motor driven driving mechanism of a sewing machine comprises a motor mounted on one side of the sewing machine and a driving mechanism disposed inside the frame of the sewing machine driven by the motor. A rotor shaft extends out of the cover, the rotor shaft comprises a connecting portion for connecting with the driving mechanism, and at least one resilient element is disposed on two sides of the connecting portion for connecting the connecting portion with the driving mechanism. Since the rotor shaft rotatably drives the driving mechanism, therefore frictional or ramming effects among the assembly parts can be eliminated or at least substantially reduced. Thus noise during operation and the damage to the mechanical parts can be effectively reduced.

Abstract: Disclosed are an apparatus for controlling a position of an embroidery frame, which is capable of performing an accurate embroidering operation by feed backing a position error due to mutual operations of interlocking devices for driving the embroidery frame using a displacement sensor for sensing a displacement of the embroidery frame, and a method thereof. The apparatus comprises an X-axis driver, a Y-axis driver, a sensor and a controller. The X-axis driver moves the embroidery frame along an X-axis direction. The Y-axis driver moves the embroidery frame along a Y-axis direction. The sensor senses a displacement of the embroidery frame to the X-axis and Y-axis directions, and outputs electric signals corresponding to the sensed displacement. The controller generates X-axis and Y-axis drive control signals based on the electric signal from the sensor in order to control the X-axis and Y-axis drivers, respectively.

Abstract: An oblique thread-guiding link of a sewing machine, including a swing arm having a front swing arm and a rear swing arm and formed with a central shaft hole. A pivot shaft is fixedly fitted in the shaft hole of the swing arm. Two ends of the pivot shaft are obliquely pivotally mounted in two opposite sidewalls of the housing of the sewing machine. One end of the pivot shaft protrudes from the housing of the sewing machine. The front end of the front swing arm is positioned above a needle holder mechanism and aligned and coupled therewith. The rear end of the rear swing arm is positioned above a driving mechanism and aligned and coupled therewith. One end of a thread-guiding fixing seat is fixedly connected with the protruding end of the pivot shaft and can be swung along with the swing arm.

Abstract: Disclosed is an apparatus for driving a shuttle of an embroidery machine. The apparatus comprises: a rotation shaft of the shuttle; a lower shaft which transfers a driving power to the rotation shaft, so as to rotate the shuttle; a first magnet provided at the rotation shaft; and a second magnet provided at the lower shaft and corresponding to the first magnet. The first magnet has a hollow cylindrical shape so that the rotation shaft can be inserted through the first magnet while firmly holding the first magnet. The second magnet has a hollow cylindrical shape so that the lower shaft can be inserted through the second magnet while firmly holding the second magnet.

Abstract: A spreader driving device is constructed so that the stepping motor (2) driven in synchronism with the elevating motion of a needle bar and the support shaft (3) are provided at a frame mounted to the back side of a presser foot. A lever (4), fitted onto the support shaft, is provided at the rear end with a sector gear (6) and at the fore end with a spreader (5). The sector gear engages with a driving gear (7) driven by an output shaft (8) of the stepping motor, so as to swing the lever (4) and spreader (5) by the drive of stepping motor. Also, the frame is divided into a movable frame having the stepping motor, the support shaft, and the lever mounted thereon, and a fixed frame (17) for mounting the device to the sewing machine. Between the frames is arranged a shifting device (18) for shifting the movable frame a moderate distance parallel to the needle position with respect to the fixed frame, whereby the center of swinging motion of the spreader can be shifted from a point P1 to a point P2.

Abstract: The present invention provides a double end yarn drive pattern attachment for tufting machines characterized by independent servo-motor control of yarn feed rolls capable of increased torque to carry multiple yarn ends on a single feed roll, thereby economically retaining many advantages of a single end pattern attachment.

Abstract: In a looper and cutter drive mechanism for sewing machine, an upper looper and a lower looper are respectively disposed below a throat plate, respective loop-taker points of these loopers are arranged in the same direction such that the loop-taker points pass a front side of the needle as seen in the stitching direction. The upper looper and the lower looper are driven such that the upper looper and the lower looper perform movements having traces on planes substantially parallel to each other. Due to such a constitution, the looper drive mechanism has both of the lockstitching function and the over-edge stitching function and can perform both functions by a single sewing machine.

Abstract: Apparatus for mounting an electric motor, which is adapted to drive an endless belt at a predetermined tension, to a stationary frame, includes a housing that is adapted to receive the motor. A drive shaft extends from the front end of the housing and is adapted to drive the belt. An elongated base mount is integrally formed on the outside surface of the housing and extends from the front of the housing for pivotally coupling the housing to the stationary frame. The base mount has a first end and a second end, and a bore which extends longitudinally at least partially through the base mount from the first end and the second end of the base mount. A substantially rigid tab is fixedly attached to the cylindrical housing at a substantially opposite side from the base mount. The tension on the belt is set by applying a biasing force on the tab to pivot the motor about the axis of the base mount.

Abstract: A power transmission device serves to transmit rotation of a main shaft of a sewing machine to a slave shaft of the sewing machine, which slave shaft extends in a torsional relationship with the main shaft. The device includes a first timing pulley mounted on the main shaft, a second timing pulley mounted on the slave shaft and a timing belt extending between the first and second timing pulleys in a twisted form.

Abstract: In connection with an electric motor (12) used for operating a sewing machine, which has a fan wheel (17) and a speed sensor (25), the fan wheel (17) and the screen disk (18) of the speed sensor (25), as well as a belt pulley (19) of the belt drive (10), are combined into a multi-function wheel (15).

Abstract: A sewing machine (1) with an overload clutch in the form of a friction clutch in the region of the handwheel (44), with a positioning motor (57), including a motor part (56) and a control part (55), and with a position transmitter (51) connected to the arm shaft (5). In the event of a blockage of the arm shaft (5), the control part (56) causes the positioning motor (57) to stop immediately and a fault warning to be output on an indicator panel (68) of the control apparatus (66). After the fault has been eliminated and the power supply has subsequently switched off and switched on again, the sewing machine (1) is ready for operation again.

Abstract: A sewing or embroidery machine, comprising a needle, a gripper and a workpiece advancing device with at least one driven advancing element. Said advancing device has a linear drive for driving the advancing element. The linear drive has two armatures which can be driven in different directions. A control device with a control circuit for the horizontal movements and a control circuit for the vertical movements of the advancing element is allocated to the advancing device and both control circuits are subordinate to a main control device comprising a data processing device. Said main control device receives synchronization impulses from an encoder according to the current position of the needle or the gripper. The actual values of the horizontal and/or vertical movements of the advancing element can be supplied to the main control device at option.

Abstract: The present invention provides a single end scroll-type yarn feed attachment for tufting machines characterized by independent servo-motor control of yarn feed rolls while eliminating tube banks typical of tufting machine feed attachments and produces new tufted carpet designs.

Abstract: A zigzag sewing machine includes an oscillating hook. The transverse needle swing amplitude of the needle of the sewing machine is increased in amplitude from that of conventional free-arm domestic sewing machines with oscillating hooks, for example, from 5 mm to 9 mm. The increased amplitude is provided by a novel drive mechanism including a rack oscillating transversely between two extreme positions in response to rotation of a driving wheel and a pinion engaging the rack. The pinion is coupled to and drives the oscillating hook. The pinion may have a variable radius, may be coupled to the driving wheel through other racks and pinions, and may be coupled to the driving wheel through a multiple bar linkage. A constant rotation speed of the driving wheel causes the hook to oscillate at a rotational velocity that varies with rotational position of the hook so that swing amplitude of the needle transverse to the linear direction may be increased.

Abstract: A driving apparatus for an oscillating catcher of a sewing machine includes a toothed pinion being eccentrically mounted on a driving shaft for the catcher for the sewing machine. A transmission device, having teeth, is guided in a back-and-forth movement by an oscillating crank drive, with the teeth of the transmission device engaging the tooth pinion on the driving shaft. By arranging the toothed driving gear eccentrically on the driving shaft of the catcher, it is possible to substantially increase the speed of the point of the catcher when it seizes the loop of the upper thread offered by the needle.

Abstract: A sewing machine includes a sewing machine motor, a main shaft driven by the sewing machine motor, a sewing needle driven by the main shaft, a shuttle for capturing a thread loop in cooperation with the sewing needle, the shuttle having a hook shaft, a shuttle driving motor for driving the hook shaft of the shuttle independent of the sewing machine motor, a drive control device for controlling the sewing machine motor and shuttle driving motor so that the shuttle is rotated in synchronism with the main shaft, a thread jamming detecting device for detecting a thread jamming in the shuttle, and a releasing device for controlling the shuttle driving motor so that the shuttle is released from the thread jamming, when the thread jamming is detected by the thread jamming detecting device.

Abstract: A controller for a sewing machine includes a driving motor 7 for driving a main shaft of a sewing machine head; a detecting unit 9 having a rotation-angle detecting means for detecting a rotational angle of the motor 7; a control section 40 for controlling the motor 7 and receiving a detection signal of the detecting unit 9; an operating section 30 for instructing the operation of the sewing machine; a designating means 34 provided in the control section 40 or the operating section 30 for designating a predetermined position in a vertically moving process of a needle 5 of the sewing machine; and a first memory portion 55 and a second memory portion 131 capable of storing and reading a value designated by the designating means, wherein the first memory portion 55 is provided in the control section 40, and the second memory portion 131 is provided in the detecting unit 9 or the operating section 30.

Abstract: An over-lock sewing machine executing an over-edge chain stitch and a double-chain stitch includes a sewing machine motor for driving a needle bar so that the needle bar is moved upward and downward, a sewing needle mounted on a lower end of the needle bar, an upper looper and a lower looper forming stitches in cooperation with the sewing needle, and a stepping motor for driving the lower looper so that the lower looper is rocked.

Abstract: A shuttle hook driver for a sewing machine includes a stepping motor for driving a shuttle hook capturing a thread loop in cooperation with a sewing needle, the stepping motor including a drive shaft, the shuttle hook including a hook shaft, an elastic member provided on a connecting member connecting between an end of the drive shaft of the stepping motor and an end of shuttle hook so as to be capable of transmitting a driving force of the drive shaft to shuttle hook and of buffing, and a damping mechanism provided on the connecting member for damping rotation of each one of the hook shaft and the drive shaft relative to the other.

Abstract: A drive means for feeding a material to be sewn on a sewing machine (1) includes a feed dog (7) to be coupled to a continuous rotary drive (9) via at least one intermediate drive. To achieve optimum drive conditions in a comparatively simple way, the intermediate drive consists of a belt drive (10) with a belt (13) circulating around a drive wheel (11) and a driven wheel (12), where the belt (13) having an excess length is guided over a control roller (14) at the working portion thereof (131) and over a tension roller (15) at the return portion (132) thereof, and the control roller (14) and the tension roller (15) are mounted so as to be periodically reciprocated in the sense of a release or deflection of the belt (13) for decelerating, stopping and accelerating the rotation of the driven wheel, and the driven wheel (12) is in rotary connection with a feed dog (7) designed as circular conveyor, in particular as conveyor belt (20).

Abstract: A shuttle hook driver for a sewing machine includes a driving pulley mounted on a main shaft, a driven pulley rotatable about a second shaft substantially crossing the shaft center of the main shaft and extending horizontally, a timing belt extending between the driving and driven pulleys and twisted approximately 90 degrees, and a converting mechanism for converting rotation of the driven pulley to reciprocation of the shuttle hook.

Abstract: A sewing machine type decorative box includes a sewing machine body and a box engaged with the sewing machine body. A music device is provided within the box, and this music device includes a rolling wheel and an end gear connected at a first end of the wheel. A rotary disk also is installed within the box, wherein a periphery of the rotary disk engages the end gear of the music device. Additionally, a rod is provided that rotates along with the rotary disk. The sewing machine body includes first and second transverse axes. A first gear is provided at a first end of the first transverse axis, and an eccentric cam is provided at a second end of the first transverse axis. The second transverse axis includes a gear at one end that engages with the first gear of the first transverse axis. A longitudinal driving axis extends between the sewing machine body and the box.

Abstract: This invention relates to an improved automatic sewing machine apparatus for sewing large articles, in lock-stitch or chain-stitch, employing two completely different upper and lower sewing mechanisms which are separately powered, wherein there is no continuous mechanical, electrical, hydraulic or other fixed connection between the upper and lower sewing mechanisms required. An open notched needle has a notch opening disposed near the needle end, the notch opening engages the needle thread, and carries the needle thread through the sewing material, and then leaves a loop extending through the sewing material as the notched needle raises above the sewing material. The notch opening in the needle is rethreaded during each cyclic, reciprocating actuation of the notched needle. A looper having two forked arms passes the thread loop around the bobbin case. The position of the open notched needle determines the timing of the looper actuation. The open notched needle position is sensed through the sewing material.

Abstract: A multihead sewing machine includes a sewing machine motor, a main shaft rotated by the sewing machine motor, a plurality of sewing needles driven by the main shaft, a plurality of shuttles for capturing thread loops in cooperation with the sewing needles respectively, each shuttle having a hook shaft, and a plurality of shuttle driving motors for rotating the hook shafts of the shuttles independent of the sewing machine motor respectively. The sewing machine motor and the shuttle driving motors are controlled so that the sewing machine motor and each shuttle driving motor are rotated in synchronism with each other. Loss of synchronism of each shuttle relative to the corresponding sewing needle is detected. Rotation of the main shaft is stopped in an abnormal condition in which the loss of synchronism has been detected with respect to at least one of the shuttles.

Abstract: A looptaker driving arrangement in a zig-zag sewing machine includes: a rotatable drive shaft driving rotation of the looptaker of the sewing machine; a main drive member rotatably supported on the drive shaft; a secondary drive member fixed on the drive shaft for concurrent rotation therewith; a bushing rotatably mounted on the drive shaft with an eccentric outer periphery; and a coupling member rotatably mounted on the periphery of the bushing in eccentric relation to the drive shaft and engaging the main drive member and the secondary drive member. Rotation of the main drive member about the drive shaft axis combined with rotation of the bushing about the drive shaft axis relative to the main drive member angularly accelerates and decelerates the secondary drive member with respect to the main drive member and, in turn, angularly accelerates and decelerates the drive shaft.

Abstract: A sewing machine, with independently driven main shaft and loop taker, stores a table containing preset speed correction values for negating rotational speed variations in the loop taker drive shaft caused by torque variations on the same; sets speed correction amounts based on speed correction values read from the speed correction value table; and outputs correction drive signals indicative of those speed correction values to the loop taker drive motor.

Abstract: A sewing machine including a needle bar having a sewing needle, a spindle for driving the needle bar, a bed portion movable selectively to a using position or a retracted position, and a rotary hook housed in the bed portion. A stitch is formed by the cooperation of the sewing needle and the rotary hook. A rotary hook drive motor is provided in the bed portion for driving the rotary hook. A sensor is provided for detecting a position of the bed portion. The needle bar and the spindle is selectively disconnected from each other. If the bed portion is out of the using position, and this out position is detected by the sensor, the needle bar is released from the spindle for stopping the sewing needle. Further, in this case, the rotation of the rotary hook drive motor is also stopped.

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 sewing machine including a needle bar to which a sewing needle conveying a sewing thread is secured, a loop catcher which catches a loop of the sewing thread conveyed by the sewing needle, a catcher shaft which is fixed to the loop catcher, a first drive device which includes an output shaft and which rotates the catcher shaft and thereby rotates the loop catcher, and a coupling device which connects the catcher shaft to the output shaft of the first drive device such that a drive force of the first drive device is transmitted to the loop catcher via the output shaft, the coupling device and the catcher shaft, and such that the catcher shaft is movable in an axial direction thereof relative to the output shaft while a phase of the catcher shaft relative to the output shaft is substantially maintained.

Abstract: In the case of a sewing machine having a cutting means for the purpose of cutting a workpiece edge a disengaging means is provided by means of which an upper cutter is moved out of a working position in which it moves in a reciprocating manner--in dependence upon the rotational movement of a drive shaft--into an inoperative position. In so doing a lower cutter is covered.

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 for mounting a needle with a needle thread; a needle drive motor for driving the needle; a bed portion; and a loop taker module detachably fixed to the bed portion and including: a loop taker for catching a thread loop of the needle thread of the needle; and a loop taker drive motor for driving the loop taker.

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: An embroidery machine having a plurality of beds and corresponding heads. In each of the heads, a plurality of needle bars supporting needles and thread take up levers are provided. Each bed contains a rotary hook drive motor provided independent of a sewing machine motor which drives a spindle extending through the heads. The rotary hook drive motor is driven in synchronization with the spindle for performing embroidery stitching, but is driven independently of the spindle at a specific rotation angle range thereof based on number of stitching. In each bed, a conventional needle thread holding mechanism is dispensed with. By controlling rotation of the rotary hook drive motor, a residual end part of the needle thread has a sufficient length capable of avoiding disengagement of the residual end part from an eyelet of the needle at a thread cutting operation.

Abstract: A sewing machine including a needle bar to which a sewing needle conveying a sewing thread is secured, a main shaft to which the needle bar is connected, a loop catcher which cooperates with the sewing needle to catch a loop of the sewing thread conveyed by the needle, a catcher shaft to which the loop catcher is connected, a drive motor which drives at least one of the needle bar and the loop catcher by rotating a corresponding one of the main shaft and the catcher shaft, a first sensor which detects a first reference rotation position of at least one of the main shaft and the catcher shaft and generates a first detection signal indicating that the one shaft is taking the first reference rotation position, a second sensor which detects a second reference rotation position of the drive motor and generates a second detection signal indicating that the drive motor is taking the second reference rotation position, and an indicating device which indicates, based on the first detection signal, that the one of the

Abstract: A sewing machine including a needle bar for mounting two needles separated by a distance in a principal shaft direction; a principal drive shaft for driving the needle bar and extending in the principal shaft direction; a bed portion; a first loop taker disposed in the bed portion; a transmission system for connecting movement between the first loop taker and the principal drive shaft; a loop taker module detachably provided to the bed portion; a second loop taker provided to the loop taker module; and servomotor provided in the loop taker module and for driving the second loop taker.

Abstract: A buttonhole sewing machine drive motor is turned on with an on switch. A large foot pedal engages the drive pulley on the motor and drives a V-belt. The V-belt drives a pulley and a timing pulley, which in turn drives a timing belt. The timing belt drives a clutch timing pulley, which freely rotates around a main drive shaft of the buttonhole sewing machine. When a small foot pedal is pressed downward, an air-activated over-the-center toggle connection moves a slide bar which moves a clutch switch spring. Parallel extension on the clutch switch spring move thrust washers and an interposed thrust bearing. The thrust washers compress a clutch disc assembly which engages the clutch timing pulley. A switch bushing is locked to the clutch disc assembly, and brake springs in a hand wheel assembly are locked to the switch bushing. The brake springs engage a hand wheel disc which is connected to a hand wheel and which is connected to an end of the main drive shaft for turning the drive shaft.

Abstract: A sewing machine including a needle bar for holding a sewing needle which conveys a sewing thread; a shaft member to which the needle bar is connected; a needle-bar drive motor which reciprocates the needle bar via the shaft member; a loop catcher which cooperates with the sewing needle to catch a loop of the sewing thread conveyed by the sewing needle; a catcher drive motor which rotates the loop catcher; an asynchronism detector which detects a first asynchronous state in which an amount of asynchronism between the needle bar and the loop catcher is greater than a first reference value and/or a second asynchronous state in which it is expected that the amount of asynchronism will be greater than a second reference value; and a holding device which holds, when the asynchronism detector detects the first and/or second asynchronous state, the needle bar and/or the loop catcher, at a holding position where the sewing needle and the loop catcher do not collide with each other.

Abstract: A flange motor for a sewing machine comprises a motor casing with a drive shaft journal projecting over the latter. A casing flange, on which an adapter flange is mounted, is allocated to the drive shaft journal.

Abstract: A manually driven stitcher or sewing machine. A lever of the stitcher is manually pivotable through an arc to reciprocate a stitching mechanism. When pivoted through the arc, the lever also actuates a clamping assembly, an article advancing mechanism, and a stitching material supplying assembly. The stitcher or sewing machine of the present invention may be used to manually stitch a variety of materials including heavier ones such as leather, nylon strapping, plastic, and rubber.

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 sewing machine including a needle bar to which a sewing needle is secured, a needle-bar drive motor which reciprocates the needle bar, a hook, a hook drive motor which rotates the hook, a speed detector which detects a rotation speed of the needle-bar drive motor, an information obtaining device which obtains information indicating that the rotation speed of the needle-bar drive motor will change, and a control device which controls, based on the detected rotation speed of the needle-bar drive motor and the obtained information, the hook drive motor so that the hook is rotated in synchronism with the reciprocation of the needle bar.

Abstract: A shaft coupling mechanism for a sewing machine includes an eccentric secured on a rotatable shaft and includes a ring engaged on the eccentric so as to be moved up and down by the eccentric. The ring has a downward extending bar. A block is rotatably secured to the lower end of the bar and rotatable relative to the bar about a pin. The block includes a rod secured to a spindle so as to rotate the spindle in an oscillating action without a ball joint. The rotational movement of the block relative to the bar will not affect the movement of the bar.

Abstract: A machine for producing a reinforcement for a composite component. The machine includes a stand with a subframe having uprights with slideways for mounting a transverse bar on which is mounted a movable carriage. The carriage has a first movable arm extending in another direction and includes a second movable arm. The carriage is movable in a first direction, X, the first arm is movable in a second direction, Y, orthogonal to the first, and the second arm is movable transversely with respect to the plane defined by the bar and first arm in a third, Z, direction. Motors are provided to producing such movements. The second arm includes a thread-stitching tool which also constitutes a tool for laying down the thread and is mounted on a rotary support at the lower end of which is arranged the needle.

Abstract: A sewing machine has a sewing head which includes a needle bar drive mechanism for vertically reciprocally moving a needle bar, a presser foot drive mechanism operable to vertically move a presser foot in synchronism with the vertical movement of the needle bar, a direction control mechanism operable to pivot the presser foot about the needle bar for controlling a direction of the presser foot to a predetermined direction, and a guide member drive mechanism operable to reciprocally pivot a guide member. The guide member is adapted to guide a cord-like material to be sewn on a work. The presser foot drive mechanism, the direction control mechanism and the guide member drive mechanism have a first drive source, a second drive source and a third drive source, respectively, provided independently of each other.

Abstract: The invention is directed to a driving apparatus for a sewing machine which has a table, an upper rotary shaft provided horizontally above the table for driving a needle, a lower rotary shaft provided horizontally below the table for driving a shuttle, a transmission mechanism for transmitting a rotational force to rotate the upper rotary shaft and the lower rotary shaft in synchronous relationship with each other, and a driving device for rotating the upper rotary shaft and the lower rotary shaft. The transmission mechanism includes a first toothed pulley which is mounted on the upper rotary shaft and rotated together therewith, a second toothed pulley which is mounted on the lower rotary shaft and rotated together therewith, and a double toothed belt on both sides of which is provided with teeth for meshing with the first toothed pulley and the second toothed pulley, respectively.

Abstract: A vibration control device for a sewing machine capable of actively reducing the vibration generated on a bed of the sewing machine by the rotation of an arm shaft, the vertical reciprocation of a needle bar, and other vibration inducing movement without reducing a mechanical strength of the sewing machine and adopting any complex designs. The vibration control device includes a sync signal generating device for generating a sync signal in synchronism with rotation of the arm shaft, a vibration sensor for detecting vibration generated on the bed, a control unit for setting a transfer function, and a piezoelectric actuator for generating control vibration. A control signal interfering with the vibration detected by the vibration sensor is generated by the control unit so as to minimize a detection signal from the vibration sensor according to the sync signal, the detection signal, and the transfer function.

Abstract: A drive force transmission for a shuttle section in a sewing machine in which a rotation of a spindle is transmitted and transformed into a swing motion to an output shaft coupled with the shuttle section, the drive force transmission comprising: a power transmission mechanism coupled with the spindle; a drive force transmission shaft rotating by the rotation of the spindle through the power transmission mechanism; and a force transforming mechanism provided between the drive force transmission shaft and the output shaft, for transforming the rotation from the drive force transmission shaft into the swing motion of the output shaft.

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