Abstract: A looper drive mechanism for a sewing machine includes: two loopers; looper drive shafts for driving the loopers; a main shaft extending across one plane transverse to the looper drive shafts; and torque transmission units for transmitting rotation of the main shaft to the looper drive shafts. The transmission units include: two slant grooved cams fixed to the main shaft and having grooves each extending through a full circumference and slanting relative to the main shaft; U-shaped followers each having two rollers, each of the rollers being supported by the looper drive shaft and rotating about its own axis within the groove of the slant grooved cams; and connection pins for pivotally mounting the U-shaped followers on the looper drive shafts so that the U-shaped followers are not rotatable in a direction in parallel with a line connecting the two rollers with each other but rotatable in a direction perpendicular to the line connecting the two rollers with each other.

Abstract: A sandwich synchronizer for a sewing apparatus. The synchronizer is formed to be interposed between the rotatable drive shaft of a sewing machine and the rotary encoder for the sewing machine. The sandwich synchronizer includes a rotatable synchronizer shaft, an encoder for detecting rotation of the synchronizer shaft, and means at either end of the synchronizer shaft for attaching to the rotary encoder and the rotatable drive shaft. The sandwich synchronizer is a universal synchronizer which can be used in any sewing apparatus, no matter what the manufacturer and no matter what the output of the rotary encoder for that sewing apparatus.

Abstract: A looper drive for a chain stitch sewing machine that includes a flexible connection that includes an intermediate guide rod that extends between a crank arm and the looper shaft. The intermediate guide rod is mounted to pivot on the crank arm and is constructed to allow a receptacle that is carried by the looper shaft to swivel or oscillate relative thereto. The intermediate guide rod carries a ball which extends into a cylindrical-shaped opening formed in the receptacle.

Abstract: A tufting machine has a main drive shaft, a looper shaft and parallel to the main shaft, a drive train therebetween in which a spindle supports, on its end, a sprocket which is driven by an endless belt from a wheel on the drive shaft. The other face of the sprocket carries a stroke control lug provided with a orbital crank pin which reciprocates a link connected to a lever on the looper shaft thereby for rocking the looper shaft, rocking the loopers carried by the looper shaft.

Abstract: A drive device for a sewing machine comprises a high speed main motor having a power transmitting flywheel, and a low speed auxiliary motor having a power transmitting pulley. The power transmitting flywheel and the power transmitting pulley being mounted through a one-way clutch on the upper shaft of the sewing machine.

Abstract: In an embroidery machine according to the present invention, at least one of driving mechanisms required for embroidery sewing has a driving source independent of the other driving mechanisms, and a control device is provided to control the driving source and those of the other driving mechanisms to be synchronously driven. With this construction, as for the driving mechanism having the independent driving source, since an interlocking mechanism can be omitted, the construction can be simplified, so that vibrations or noises can be reduced. Further with a control signal from the control device, a timing of operation of the driving mechanism having the independent drive source can be freely determined according to the embroidery mode.

Abstract: A sewing machine apparatus driven by a motor, which is subject to velocity control on the basis of a detector for determining the rotary position and/or velocity of the motor output shaft. A controller is operative to control the speed of the motor in accordance with a velocity command value. A means for generating a holding force during a stop of the sewing machine ensures that the sewing needle does not provide unwanted movement. The holding force is changed when movement from the stop position is desired, as by changing the force in relation to the speed or amount of movement. This feature is particularly useful to reduce the load presented to an operator who wishes to manually change the machine position.

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: An operation apparatus for a sewing machine has an electric motor for driving the sewing machine and electronic components for operating and controlling the electric motor and sewing machine; the electric motor and electronic components are accommodated within a common, heat-conductive box-type body effective to dissipate the heat generated inside the body by the electric motor and the electronic components to the outside.

Abstract: A sewing machine of a small size is enabled to deal with a fabric of an increased size to be sewn. A vertical spacing between an upper shaft mechanism and a lower shaft mechanism is adjustable. A need for a special control circuit which is designed for matching rotational positions of an upper and a lower shaft is dispensed with. At this end, a flexible wire 30 is used to connect an upper shaft unit 1 and a lower shaft unit 2 together. A single electric motor 10 is disposed within one of the upper and the lower shaft unit while a speed increasing mechanism 20 (or a speed reducing mechanism) is disposed in the other. An air cylinder 40 enables the vertical position of the upper shaft unit 1 to be adjustable.

Abstract: A looper drive cam is formed of a cylindrical cam which is fixed to a main shaft so that its axis is inclined thereto at an angle of .theta.. A looper drive fork forming an U-shaped cam follower is attached to a looper drive shaft, and is engaged with the inclined cam. The fork is attached to the looper drive shaft with a degree of freedom which allows for deviation between axes of the main shaft and the looper drive shaft. As the main shaft rotates, a cam face of the inclined cam changes in a range of .+-..theta. in a plane containing the main shaft, so that the fork rotates to rotate the looper drive shaft. Owing to the freedom of degree of the fork thus attached, the motion is transmitted smoothly, and wear and rattling are prevented.

Abstract: A knife drive mechanism of a sewing machine includes a drive assembly 1 for converting rotary motion of a drive shaft 10 into a swing motion and an upper-knife drive assembly 2 for converting the swing motion into an up-and-down motion of an upper knife 20. The upper-knife drive assembly 2 has a clutch 3 for preventing/permitting transmission of the up-and-down motion to the knife 20. Even during stitching, engagement/disengagement of the clutch 3 can be effected, which permits the knife 20 to be connected to and disconnected from its drive assembly, thereby permitting the scissoring cutting to be started or stopped. When a surface 42 of the first swing member 4 urges a projection 52 of a second swing member 5 to cause the knife 20 to move downward at the completion of cutting, the knife 20 itself serves as a cloth-feed guide to prevent misalignment of the cloth and breakage of the sewing needle or upper and lower loopers.

Abstract: In a sewing machine, a judgment is made whether a needle speed is above or below a threshold speed. When the needle speed is above the threshold speed, meaning the machine is sewing normally, a constant power is supplied at a level associated with a foot pedal setting. When the needle speed drops below the threshold, the power is alternated between power on and power off states to drive the needle in a manner similar to a hammer driving a nail. The indication of needle speed may be obtained by measuring the rotating speed of the sewing machine motor, judging the load applied to sewing machine motor, or by detecting the driving current supplied to the sewing machine motor.

Abstract: In this sewing machine, in which the amplitude and direction of the feeding of the fabric to be sewn are controlled by an electric motor slaved to an electronic pilot-control circuit, the bobbin (16), its drive mechanism (17, 19, 10) and the drive mechanism (4*-17*) for feeding the fabric to be sewn are mounted on an intermediate support (6) that is solid with the body of the motor (11), which is attached to the frame (2) of the machine by a sleeve (23) engaging the inside of the lower arm of the frame.

Abstract: An electronic sewing machine whose needle bar assembly is made to reciprocate by means of a pair of cooperating solenoids in conjunction with a bobbin driven by a stepping motor to accomplish the sewing. The stepping motor's steps are made variable programmatically by a CPU attached to the machine such that the tightness of a stitch may be controlled. Additionally, the machine may be programmed to deliver a defined number of stitches in a defined number of stitch runs, position the needle up or down, report a variety of accounting and maintenance data and can be taught to perform a variety of sewing runs.

Abstract: A sewing machine is disclosed having an electric circuit divided into a first high-voltage section and a second low voltage section. The second section is supplied via a step-down transformer connected to the first section. The second section has a rectifier connected to the output of the transformer for dispensing DC power to the functional elements of the machine. The first circuit section, the transformer and some elements of the second section are contained in a remote housing which is separate from the machine and is linked to it by a cable. A foot pedal for actuating the machine is integral with the housing.

Abstract: A sewing machine includes a bed, a pedestal supported by the bed and an arm extending generally parallel to the bed. One end of the arm is supported by the pedestal, this end having a driving motor located therein. The location of the driving motor suppresses vibration created when the sewing machine is operated and facilitates access thereto.

Abstract: A motor for driving a sewing machine is mounted in a machine frame of the sewing machine. A motor shaft of the motor is coaxially connected to a main shaft of the sewing machine by means of a coupling. The motor shaft is supported in a housing of the motor by means of a bearing provided on one side of the motor. On the other side of the motor, the coupling joining the motor shaft and the main shaft is supported by a bearing mounted in a frame arm of the sewing machine.

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 including a mercury switch for detecting tilt of the sewing machine. When the tilt of the sewing machine is detected by the mercury switch, a machine motor of the sewing machine is inhibited from being driven. Accordingly, even if a foot switch for driving the machine motor is depressed under the tilted condition of the sewing machine, the machine motor is not driven, thereby improving the safety of the machine. Furthermore, when the sewing machine is tilted during driving of the machine motor, the inhibition of drive of the machine motor is canceled, and a driving speed of the machine motor is set to a low speed. Under this condition, an operator can easily adjust a fabric feeding device, a thread cutting device and a rotating hook.

Abstract: A sewing machine drive assembly having one or more pulleys and drive belts also includes a mechanism for enhancing traction between a belt and a pulley to resist slippage under maximum power to be coupled through the drive assembly from a motor to the crankshaft of the sewing machine. The traction enhancing mechanism includes a support member and belt engagement members connected to the support member at respective locations so that the belt mounted on the pulley with which the mechanism is associated is deflected inwardly.

Abstract: A quick feeding shaft is rotatably supported at a bed of a perforating sewing machine. A quick feeding shaft rotatable in one direction and has one end coaxially connected to a magnetic clutch shaft and the other end coaxially connected to one end of a quick feeding shaft body provided with a worm. A magnetic clutch is secured coaxially to the magnetic clutch shaft and operatively connects the magnetic clutch shaft to the quick feeding shaft. A pattern wheel shaft is disposed at right angles to the quick feeding shaft and has a pattern wheel for feeding a sewn cloth quickly. A worm wheel coaxially secured thereto at an intermediate portion thereof to mesh with the worm. The worm wheel and the worm form a gear mechanism for transmitting the rotational driving force of the quick feeding shaft to the pattern wheel shaft.

Abstract: An improved driving structure for a mini-sewing machine, includes an elongated frame body having a front end and a rear end, a sewing needle which may be rigidly connected to the front end of the elongated frame body, and is arranged to operatively point downwards. A sliding block is pivotably connected to the rear end of the elongated frame body, and is formed with an elongated slot near its lower end. A driving gear and a cap are disposed on respective opposite sides of the sliding block. A coupling mechanism couples the driving gear to the cap; first and second portions of a guiding mechanism are eccentrically located on the driving gear and on the cap, respectively, and are coupled to one another through the elongated slot of the sliding block for operatively imparting a reciprocal movement to the sliding block, and thereby also to the sewing needle. A driving mechanism operatively rotates the driving gear, and is adapted to be driven by a motor.

Abstract: An electronically controlled sewing machine, comprises a current detecting device for detecting a value of current flowing through a stepping motor that drives a machine part and current setting means for setting a value of current to be applied to the stepping motor. The sewing machine further includes a control device (CPU) for storing a plurality of different values of currents to be applied to the stepping motor and driving the stepping motor until the stepping motor passes through an initial position thereof. The control device stops the stepping motor at a predetermined angular position thereof spaced from the initial position. The control device supplies the different values of currents to the stepping motor in a predetermined sequence from a smallest value to a larger value of current under a predetermined program to drive the stepping motor until the stepping motor reaches the initial position thereof.

Abstract: The invention comprises an arrangement for controlling a machine by means of the body movement of the operator. It is used for controlling a sewing machine intended for a handicapped person or for an operator not using the foot control. A pulse (18) consisting of a number of periods of 40 kHz sound waves are emitted from a loud-speaker (15). The sound waves are reflected by the head of the operator and a digital circuit measures the time takes the sound pulse to return to the receiver (16). The distance measured to the head of the operator is then used to proportionally control the speed of the machines motor.

Abstract: In an automatic sewing device the sewing head has, for producing a tangential path of the needle relative to the seam to be produced, a rotary housing which receives the needle bar and a likewise rotatable hook bearing which receives the hook and which can be tilt driven by an adjusting shaft at the same angle of rotation as the rotary housing. A drive shaft is provided for driving the needle bar and the hook. To enable even pivoting movements of the rotary housing in a simple embodiment without a change in the height of the needle bar occurring, there are provided a device for the drive-like connection of the adjusting shaft and the drive shaft and a device for the disengagement of the drive motor from the drive shaft.

Abstract: Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a workpiece clamping means; a stitch forming device for working button-holes in the workpiece and including a mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral vibrating mechanism; and an arm shaft for driving the up/down moving mechanism.

Abstract: A sewing machine employing a stepper driven-stitch patterning mechanism including a stepper rotated cam with a spiral cam groove tracked by a follower formed with different cross sectional shape than the cam groove in order to provide only point contact with each side of the cam groove when spring biased therein. A spring arrangement biases the cam and follower together in a direction perpendicular to the axis of cam rotation, thus minimizing lost motion between cam and follower.

Abstract: There is disclosed a sewing machine suitable for sewing articles such as clothes, bedclothes and the like, and, in particular, for thick bed quilts or futon comforters. This sewing machine includes: a machine frame (10); upper and lower support bases (27), (33) connected to the machine frame for horizontal movement; upper and lower rotary members (26), (32) connected respectively to the upper and lower support bases for turning movement; a machine body (55) having an arm unit (56) and a bed unit (57), the arm unit being connected to the upper rotary member, the bed unit confronting the arm unit and being secured to the lower rotary member; a mounting mechanism (58) interconnecting the arm unit with the upper rotary member for upward and downward movement of the arm unit; and a vertical drive mechanism (59) for moving the arm unit upward and downward. The upper and lower support bases are adapted to be driven synchronously with each other along their respective guide members by an X-axis drive mechanism.

Abstract: A rotational stitching apparatus with separately driven stitching head is used for stitching folded sheets by wire and thread clamping, thread sealing, and loop thread stitching. The drive system permits autarkic stitching heads to be optionally replaced and to be adjusted in correspondence with the product assortment. Each stitching head has a stitching head driveshaft, by means of which it is connected to the stitching cylinder driveshaft 1 or the cylinder axle 37, preferably by way of a gear or the toothed belt. Implementation of various stitching technologies is made possible by additional apparatus disposed peripherally to the stitching cylinder circumference.

Abstract: A sewing machine is with stepper motors which work alternately in one direction or another to greatly reduce the number of parts for achieving the movement desired in the internal mechanisms of zig-zag sewing machines. The zig-zag mechanism for moving the sewing needle consists of a single, main driving element, formed by a stepper motor. The mechanism has a radial cogged spur gear at its outlet which engages a rack or linear gear formed by two adjoining bodies each having meshing teeth that engage the spur gear to eliminate any play between the spur gear and the two rack bodies. The rack is connected to a lever mechanism including an elongated, cambered,--shaped lever with a curved end. The curved end of the lever is connected to a needle bar support which is pivotally connected at its upper end to the sewing machine. A needle bar is connected to the needle bar support to enable the lever mechanism to impart a to and fro rocking motion to the needle.

Abstract: A walking needle chain stitch sewing machine having multi sewing heads laterally spaced apart from one-another, that includes upper primary drive shaft and secondary lower first and second drive shafts and mechanisms thereof for driving first and second needle-drive mechanisms, and that further includes other secondary lower third and fourth drive shafts and mechanisms thereof for driving first and second feed-dogs and mechanisms thereof, with the first and second drive shafts being connected to the primary drive shaft by respectively spaced-apart drive-belts each mounted between driving and driven gears, and with the third and fourth drive shafts likewise being connected to the primary drive shaft by respectively spaced-apart other drive-belts each mounted between other driving and driven gears.

Abstract: At a sewing automat the sewing head is provided with a rotary housing incorporating a needle bar, a needle bar jogging mechanism and a thread take-up mechanism and a rotatable hook bearing receiving a hook, in order to generate a tangentially directed needle feed movement of the needle relative to the seam to be produced. In order to achieve constant lengths of stitches at swivel motions of the rotary housing and the hook bearing a rotary position indicator associated to a central control unit is connected to a main drive shaft, wherein the rotary position indicator puts out a pre-given number of pulses per revolution of a main drive shaft. The main drive shaft and an adjusting shaft are operably connected to the rotary position indicator via a differential gear in such a manner that at swivelling of the adjusting shaft the rotary position indicator generates a number of pulses corresponding to the swivelling of the adjusting shaft.

Abstract: In a drive for a sewing machine, especially an industrial sewing machine, with a needle that can be reciprocated between an upper and lower end position by a sewing machine main shaft, in which the drive is in direct driving connection with the main shaft and can be controlled at variable speed through a control system, provision is made for improving the dynamic performance of the combination of drive and sewing machine by equipping it with at least one input switch connected electrically to the control system for the input of command pulses for the step-wise actuation of the drive such that with each command pulse a certain, defined amount of movement of the drive and hence of the main shaft is triggered.

Abstract: At an automatic sewing device the sewing head for generating a tangential movement of the needle feed movement relative to the seam to be produced is provided with a rotary housing for receiving a needle bar, a needle jogging mechanism and a thread take-up lever drive, and a rotatable hook bearing for receiving a hook. In order to achieve constant stitch lengths even when the rotary housing and hook bearing are swivelled, the main drive shaft for the stitch forming instruments and the adjusting shaft for the rotary housing and the hook bearing are coupled via a differential gear in such a manner that at rotations of the adjusting shaft a swivelling motion is imparted to the main drive shaft, which acts against changes of the position of the needle bar, the needle jogging mechanism, the thread take-up lever drive and the hook.

Abstract: An electric sewing machine with computerized control in which the speed of rotation of the central control motor (M) is brought under the control of a regulating circuit (O, C.sub.1, C.sub.s) comprising a control tacho generator (G), has a mechanism for driving a support for a bobbin (C) to be wound, comprising all the structural elements of the generator (G), a double action clutch (E.sub.A) allowing the rotor of the generator (G) to be connected mechanically either to said central motor (M) or to the bobbin support, electrical switching means (I.sub.E, I.sub.G) allowing, in the last case, the armature of the generator (G) to be connected to an electrical supply source (A) while preventing the central control motor (M) of the machine from being supplied with current.

Abstract: A sewing machine in which the bed shaft and the arm shaft have been replaced by a synchronous belt and the plane of rotation of the synchronous belt is perpendicular to the cloth feeding direction. All function units which drive or are driven by the synchronous belt and the belt itself are mounted on the same side of the sewing machine body. A number of backing rollers guide the synchronous belt in the plane of rotation. These backing rollers are on shafts which are either stationary or driving. The shafts are supported by the sewing machine body in rotation or stationary manners. The backing rollers can be smooth or toothed wheels which drive or are driven by the synchronous belt. Some toothed wheels can drive several function units of the sewing machine. By changing the diameter of the toothed wheels in relation to each other the time relation between the several function units of the sewing machine can be controlled.

Abstract: A work material feeder for a sewing machine includes a work material holder which is movable within the plane perpendicular to a passageway where a needle is moved up and down, a first pulse motor which reciprocates the work material holder in one direction within the plane synchronously with the vertical movement of said needle, a second pulse motor which reciprocates the work material holder in another direction perpendicular to the aforesaid direction synchronously with the vertical movement of the needle, and a rotation divisibility switching circuit which switches the divisibility of rotation of the first and second pulse motors in several steps, the first and second pulse motors being driven in accordance with the divisibility set by the rotation divisibility switching circuit in order to move the work material holder.

Abstract: Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a piece clamping means; a stitch forming device for working button-holes in the work piece and including mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral and an arm shaft for driving the up/down moving mechanism.

Abstract: A sewing system is proposed, which has a sewing head with thread tightener, a presser foot, a lower thread roll with a shuttle for guiding the lower thread and transport or transfer means for the further transporting of the workpiece to be processed. Separate drives are associated with these individual elements and these drives are synchronously controlled by a control device.

Abstract: A multiple rotary drive system for a textile-working machine has first and second clutch-brake units. Each clutch-brake unit has a rotatable flywheel, a non-rotatable brake surface, and a rotatable shaft to be driven, whereby the rotatable shaft can be connected to the textile-working machine as a rotary drive of the system therefor. A clutch disc and a brake disc of each clutch-brake unit are connected to the shaft thereof for rotation therewith and are arranged for controllably engaging with, respectively, the flywheel for rotatably driving the shaft therefrom and the brake surface for braking rotation of the shaft therefrom. The flywheel of the first clutch-brake unit is rotationally driven, whereby the drive system can be driven by a continuously-rotating shaft of a continuously-operating electric motor. A belt extends about each flywheel for coordinate rotation of the flywheels when the one is rotatably driven by the electric motor.

Abstract: Method and apparatus for determining and regulating the amount of advance of a plurality of workpiece plies at a sewing machine which is affected by scanning the individual plies while recording the stitches being formed between two separate feed points and actuating top and bottom feed devices to achieve a desirable feed of each ply. Signs present or to be applied at any desired point of the workpiece plies are scanned at two successive points, and pulses generated by a pulse generator connected with the main shaft of the machine are summed during this period of time. The pulse sum is compared with a number of pulses which depends on the mutual spacing of the scanning points and on the adjusted stitch length. For two work plies the pulse sums formed between the recognition of the signs are compared directly. As signs to be scanned are used either imprinted marks, the jags of a pinked workpiece edge, or the bright, dark structure of a surface section of the workpiece.

Abstract: A sewing machine having a base constructed of two modules having coupling means permitting one of said modules to be quickly removed from the other so that different sewing instrumentalities can be substituted to alter the type of stitch being made.

Abstract: An overhand sewing machine for the sewing of innersoles to the shanks of shoes comprises two driven conveying disks, an inner conveying disk in contact with the shank material, and an outer conveying disk in contact with the innersole material, the outer disk being displaceable with respect to the inner disk in order to be pressured by spring-loading against the inner disk, and to be capable of moving away against the spring-loading from the inner disk, as required for the insertion of the material to be sewn into the overhand sewing machine.

Abstract: In a sewing machine, needle bar and take-up motion is timed to feed dog motion through a constant breadth cam and gear in predetermined angular positions on the arm shaft, a gear on a vertical shaft in mesh with the arm shaft gear according to timing marks on the gears, and a lift cam in a predetermined angular position on the vertical shaft relative to the gear thereon.

Abstract: The disclosure concerns a drive device for a double thread chain-stitch buttonhole sewing machine. The machine has a first drive shaft for driving the sewing needle and for moving the cloth support plate for sewing. It has a separate worm shaft for moving the cloth support plate to the sewing position and also for operating a knife for cutting the buttonhole. A first respective electromagnetic clutch operates the sewing needle drive shaft, and a second respective electromagnetic clutch operates an intermediate shaft which then operates the worm shaft for operating the cloth support plate and knife operating shaft are provided. A drive shaft is connected with the armature part of the first electromagnetic clutch on the sewing needle driving shaft. That armature part is gear connected with an armature part of the second clutch on the intermediate shaft.

Abstract: A sewing machine in which a frame which is moved by to-and-fro feed device is provided to be movable forwards and backwards along a guide mechanism provided to a base; an arm unit and a base unit of sewing machine body are provided to the frame in such a manner that the arm unit and the base unit are respectively supported and guided by a pair of horizontal upper and lower guide members, which are provided to the frame and disposed vertically, to be laterally movable, the arm unit having a head and the base unit having a rotating hook complete and being separated from the arm unit; the arm unit and the base unit are moved by a lateral feed mechanism laterally and synchronously with each other along the guide members; and a supporting bed for supporting an article to be sewed is disposed between the arm unit and the base unit of the sewing machine body so that the supporting bed passes between the guide members.

Abstract: An anti-wobble device for a connecting rod (3) in a mechanism comprising a crankshaft (1) connected via a spherical coupling (4) to the larger end (5) of the said connecting rod (3), the smaller end (6) of which is connected via a similar spherical coupling (7) to an arm (8) fixed to a driven shaft (9), the axis of which is perpendicular to the axis of the crankshaft (1), in which device, a rigid element (13-16) is integrally and perpendicularly mounted on the driven shaft (9), with respect to which it can also be adjusted both axially and radially; this rigid element makes contact with a curved surface (12) formed on the small end (6) of the connecting rod (3) and concentric with respect to the axis of the said small end (6) of the connecting rod (3), against which surface the said element can rub in a parallel manner during the movements of the mechanism.

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

Abstract: A sewing machine utilizing two needle rods driven by separated coaxial drive shafts and means for selectively interconnecting the two coaxial drive shafts. The means connecting the drive shafts can be selectively disengaged by means of an electromagnet depending upon whether it is desired to operate one or both of the needle rods at the same time.