Abstract: A sewing machine translates a stitchwork frame with which a cloth is fastened along a direction of a plane where the cloth is fastened based on stitchwork data to form a stitchwork pattern. A presser foot located above the cloth has a height changed by an actuator like a stepping motor in accordance with the advancement of a stitchwork formation. Hence, a predetermined clearance between the cloth and the presser foot is maintained.

Abstract: A sewing machine is disclosed that includes a needle bar allowing attachment of a sewing needle including a needle eye to a lower end of thereof; a needle-bar lifting/lowering mechanism that moves the needle bar up and down; a presser foot; a presser foot lifting/lowering mechanism that moves the presser foot up and down; a hook that is provided with a beak for seizing a needle thread loop formed at the needle eye and that rotates in coordination with the up and down movement of the needle bar; and a controller that controls the presser foot lifting/lowering mechanism so as to resize a needle thread loop by lifting the presser foot to a predetermined height in coordination with a swing position of the needle bar and a predetermined height of the needle bar where the beak meets the needle thread loop.

Abstract: A presser device for a sewing machine is disclosed. The presser device includes a presser bar; a presser foot provided at a lower end of the presser bar; a presser spring elastically biasing the presser foot downward; a presser-foot lifting lever moved between a lifted position and a lowered position for lifting/lowering of the presser foot; a speed restraining element producing resistance capable of slowing down the movement of the lever; and a speed-restraint switch mechanism that slows down the movement of the presser-foot lifting lever by allowing the speed restraining element to produce the resistance when the presser-foot lifting lever is moved from the lifted position to the lowered position, and that does not slow down the movement of the presser-foot lifting lever by not allowing the speed restraining element to produce the resistance when the presser-foot lifting lever is moved from the lowered position to the lifted position.

Abstract: A sewing machine includes a main body, a presser bar attached to the main body so as to move along a vertical direction of the sewing machine and detachably holding a presser foot, a needle thread tension adjustment mechanism selectively brought into inactive and active modes, the needle thread tension adjustment mechanism releasing a needle thread tension in the inactive mode and maintaining the needle thread tension in the active mode, and a presser bar lifting lever manually rotated along the vertical direction by a user of the sewing machine and adjusting a position of the presser bar in the vertical direction in accordance with the manual rotation, the presser bar lifting lever including a height adjustment cam portion adjusting the position of the presser bar in the vertical direction and a thread tension adjustment cam portion allowing the needle thread tension adjustment mechanism to adjust the needle thread tension.

Abstract: A presser foot drive structure of an embroidery machine, by which a vertically movable presser foot for preventing a sheet of cloth to be sewn from rising in a sewing operation is vertically moved inside a sewing head. The presser foot drive structure includes a presser foot drive holder, which is vertically slidable and is mounted on the outer circumference of a needle bar, which is vertically driven; a presser foot drive shaft, which is disposed parallel to the needle bar via the presser foot drive holder; and the presser foot, which is disposed at the lower end of the presser foot drive shaft and vertically reciprocates. It is possible to reduce the stroke of a presser foot so that it is smaller than that of a needle bar, enhance the supporting force for a needle bar, and reduce the shaking of a presser foot.

Abstract: A clutch structure for a presser foot in an embroidery sewing machine is provided. The clutch structure includes a guide member, to which the presser foot drive link is rotatably connected, and through which the needle bar guide shaft passes, a spring connecting member mounted on the outer circumference of the needle bar guide shaft and inside the guide member, a resilient member mounted on the outer periphery of the spring connecting member, and a pivot member mounted inside the guide member so as to be pivotable around the needle bar guide shaft within a certain angular range by the height adjusting mechanism and the resilient member. Upon a head-interval adjusting operation, the unnecessary driving of the presser foot is prevented, so that the occurrence of vibrations and noise as well as the unnecessary wear of a needle bar, a presser foot support, and a presser foot holder can be prevented.

Abstract: A clutch structure for a presser foot in an embroidery sewing machine is provided. The clutch structure includes a guide member, to which the presser foot drive link is rotatably connected, and through which the needle bar guide shaft passes, a spring connecting member mounted on the outer circumference of the needle bar guide shaft and inside the guide member, a resilient member mounted on the outer periphery of the spring connecting member, and a pivot member mounted inside the guide member so as to be pivotable around the needle bar guide shaft within a certain angular range by the height adjusting mechanism and the resilient member. Upon a head-interval adjusting operation, the unnecessary driving of the presser foot is prevented, so that the occurrence of vibrations and noise as well as the unnecessary wear of a needle bar, a presser foot support, and a presser foot holder can be prevented.

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: In a method of pulling the free end of a needle thread from the top to the bottom of at least one work piece upon a first stitch of a seam that is to be sewn, use is made of a sewing machine with at least one presser which can be placed on, and lifted off, the work piece. The needle thread is held tight while a needle-thread loop is extended by the tip of the hook so that the free end is pulled through the work piece. While the needle thread is held tight, the presser is at least partially relieved. The relief time increases as the thickness of the work piece grows.

Abstract: An actuating device intended for a sewing device or sewing machine includes a material pressing device for holding down the material to be sewn during stitch formation and transport, and at least one linear motor which serves as regulating element for the material pressing device. The drive rod of the actuating element is connected to the material pressing device so as to control the pressure the pressing device exerts on the material to be sewn. The drive rod is linked to the pressing device via at least one elastic low-mass coupling element and the pressing device can be placed by the linear motor back and forth between a raised and a lowered position.

Abstract: A sewing machine is provided with a presser foot mechanism having a pressure bar and a presser foot, and with a linear motor (20) as an adjusting element. The linear motor (20) is arranged at least partially in the arm (2) of the machine housing and the drive bar (19) of the linear motor (20) is connected via an angle lever (14) to a spring bracket (7) holding a spring (9). The spring bracket (7) is also connected to the pressure bar (4).

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: When a trace mode is started, a needle and a presser foot are moved relative to an embroidery frame. When a STOP key is pressed, moving is temporarily stopped, and the operator can visually check a positional relationship between the needle and the embroidery frame. When it is necessary to check the positional relationship in detail, a DOWN key is pressed and the presser foot is lowered independently of the needle, so that the operator can visually check the positional relationship between the presser foot and the embroidery frame.

Abstract: A sewing machine includes a position rod fixed under a plate base for securing an electromagnet horizontally. The position rod has a front end holding a roller for a connecting band to extend around. The lower end of the connecting band is bound with a working rod of the electromagnet. In using the sewing machine, the electromagnet is electrically activated or desactivated to attract the working rod to the left side or the right side for pulling or not pulling the connecting band and a swing arm so as to lift or lower the presser foot. Thus the space for installing the electromagnet can be narrowed and the power required by itself may be decreased.

Abstract: In a presser foot device of a sewing machine, a presser foot is vertically movably supported to a sewing machine body frame by a presser bar. A drive device moves the presser bar up and down in accordance with a drive signal. A sensor detects when the presser foot is raised close to a top dead center position, that is, a predetermined position. Based on the detection by the sensor, a control device controls the drive signal for the presser foot drive device.

Abstract: An apparatus for moving a work-sheet pressing member of a sewing machine relative to a work-sheet supporting member to press a work sheet on the work-sheet supporting member, the apparatus including a biasing device which produces a biasing force to move the work-sheet pressing member in a downward direction toward the work-sheet supporting member, a solenoid which moves, against the biasing force, the work-sheet pressing member in an upward direction away from the work-sheet supporting member, a control device which controls an energization of the solenoid so that the work-sheet pressing member is moved in the downward and upward directions, a detector which provides a detection signal indicating that the work-sheet pressing member is moved in the downward direction to a braking position which is predetermined relative to the work-sheet supporting member, the control device receiving the detection signal from the detector, and the control device controlling the solenoid such that, when the control device rec

Abstract: An arrangement in a sewing machine including a fabric feed dog (14; 44) for feeding a fabric to be sewn, and a vertically movable presser bar (12; 42) having a presser foot (13; 43; 63) and a presser spring (23; 53). The presser bar is actuatable by a power-driven actuator(19; 49) connected to the presser spring and slidable in parallel with the presser bar. The actuator is movable relative to the presser bar to adjust the presser foot pressure and operatively connected to the presser bar to raise and lower the presser foot during the sewing procedure in accordance with a predetermined program. In one embodiment, the presser foot (13, 43) is slidable to follow the fabric during the feeding step. In another embodiment, the presser foot (63) is provided with a top feed ruffler (69, 70) for forming tucks or pleats in the fabric being sewn.

Abstract: A presser foot and needle drive device in an embroidery machine includes a drive mechanism and a control device for vertically reciprocally moving a presser foot between upper and lower dead center. The control device operates the drive mechanism according to patterns of presser foot movements which are determined for specific sewing conditions.

Abstract: A control device for sewing machines which includes a drive system controller which controls each of numerous driving units provided in the sewing machine and which is connected to an optional command system controller that is positioned outside of the sewing machine. Thus, a control code from the outside command system may be input and decoded to control the drive system controller.

Abstract: A transmission mechanism used for sewing machines equipped with a carriage comprising a base plate having an opening, a fixing clamp for mounting the base plate to the carriage, and an apparatus for transmission which can be vertically attached to the base plate under the opening thereof. The transmission apparatus has a plunger passable through the opening to perform a reciprocating movement. The transmission apparatus has all its elements substantially disposed within a housing encased by an upper cover and a lower cover thereof to form an integral piece and to reduce the total length thereof.

Abstract: Apparatus for reinforcing or attaching composite structural materials by chain-stitching. A reciprocating head is powered to alternate between outward and return motions. A needle is mounted for outward and return movement with the head, the needle having a material piercing end and a notch adjacent the material piercing end. A cast off has a first portion configured to overlie the notch, to maintain a thread within a notch, and a second portion configured to expand a loop in the thread on release of the thread from the notch. The needle pierces the material on outward motion of the head and withdraws through the material, with the thread in the needle notch, during the return motion of the head. The cast off first portion overlies the needle notch during a part of the needle return movement and moves in trailing relation to the needle during a part of the needle outward movement. A pressure foot may also be commonly driven, with the needle and cast off, by the head.

Abstract: A sewing machine which is used with manual feed movement of a sewing material has a holding device for the material that is effective during the first phases of stitching of a seam section, by which the first thread knot is held from becoming undone when short thread ends and a large feed movement are used. In a first embodiment, the holding device includes a holding foot, by a drive mechanism in addition to a presser foot which is periodically moved up and down by a drive mechanism, and a controllable drive for the holding foot. In a second embodiment, the holding device includes a presser foot, a compression spring and a decoupling mechanism by which the presser foot can be disconnected from its drive mechanism.

Abstract: In a sewing machine which is so designed that its cloth presser driven to press a material to be sewn for a sewing operation is automatically released when the sewing operation is ended, a sewing machine control device comprising drivers for operating a brake to stop the vertical movement of the needle, for operating the cloth presser, and for operating a thread wiper and a control section. When the needle is moved to its upper position at the final stage of the sewing operation, the control section operates the driver for the thread wiper and restores, after the thread wiper has been restored, the cloth presser. Alternatively, if the thread wiper isn't used, when the needle is moved to the upper position, the control section operates the brake and releases the cloth presser whereby the time which elapses until the cloth presser has been released is shortened.

Abstract: A sewing machine has an automatic control system. This system provides for an automatic sewing mode for sewing according to previously stored sewing data and an ordinary sewing mode for sewing independently of the stored sewing data. When an interruption signal is generated by an interruption signal generating device during sewing process in the automatic sewing mode, the ordinary sewing mode is set and the pressure on the presser foot is released. Therefore, it is capable of smoothly feeding a material when feeding direction of the material is varied.

Abstract: A presser device for a sewing machine, comprising: pressing means reciprocally movable between a holding position in which it presses and holds a workpiece and a releasing position in which it is spaced the farthest from the workpiece; drive means for driving the pressing means; means for controlling the drive means so that the pressing means is brought into the holding means before the start of the sewing operation of the sewing machine; means for controlling the drive means so that the pressing means is brought from the holding position to the releasing position after the end of the sewing operation; timer means for setting a predetermined time from the instant when the pressing means is brought into the releasing position; and means for controlling the drive means so that the pressing means is brought from said releasing position to an optional intermediate position between the releasing position and the holding position after lapse of the predetermined time.

Abstract: The invention relates to an electronic system for the continuous speed control, with stopping at fixed preselected points for industrial sewing and/or overcasting machines. The invention also relates to a system which can afford additional control of the electromagnetic operational components e.g. the presser foot, of cutting device and of thread loosening device, using a driving system with an asynchronous motor and an electromagnetic coupling.

Abstract: A sewing machine with a workpiece holding-down device comprises an arm movable between an upper position and a lower position and normally biased to the upper position. An auxiliary workpiece holding-down member is movable between an upper position and a lower position in synchronization with the rotation of a main shaft and is normally biased to the upper position. A disengageable interconnecting means is interposed between the main shaft and auxiliary holding-down member. Electromagnetic means is energized upon starting of a sewing operation and is deenergized upon the completion of formation of a seam. An operation means is operable in response to energization of the electromagnetic means to impart an operative force to the auxiliary holding-down member and a holding-down arm and releases the operative force in response to the deenergization of the electromagnetic means.

Abstract: A lockstitch sewing machine has a needle (22) and awl (24) mounted on a common pivot (52) and actuated each by a crank mechanism (40;72), the two mechanisms being mounted on a common crank shaft (38). Each mechanism is constituted by a bell crank lever (44;76); the two levers also being mounted on a common pivot (46). This latter pivot (46) is disposed intermediate the pivot (52) for the needle and awl and the crank shaft (38).

Abstract: A lockstitch sewing machine has, in addition to stitch forming instrumentalities (22, 24), a needle thread control arrangement (32) by which the tension in the needle thread (T2) is controlled during stitch formation. In addition, said arrangement (32) ensures that each formed stitch is drawn into the body of the workpiece, by pulling on the thread while it remains clamped by thread clamping means (200, 202). This pulling takes place in the early stages of the formation of the next stitch so that, at the end of the machine stitching cycle, the final stitch is not set by this arrangement (32). Instead, electrically actuated stitch setting means (220 to 226) is provided operable in response to an "end of cycle" signal supplied by control means by which further "end of cycle" functions (e.g. release of a presser foot (36) and of the thread clamping means (200, 202) are also controlled.

Abstract: In a sewing machine for performing twin overedging and seaming in one high-speed operation, specially designed top and bottom variable feed dogs pull the two plies through a three needle stitching area with improved, simplified elements for diverting one ply edge while the other is being overcast. The upright overcast edge of the top ply passes through a tunnel formed through the top feed dog. A guide wall attached to the throat plate guides the top edge away from the bottom overedging station. A guard wall can be attached to the presser foot to keep the turned-up top edge away from the seaming needle. A fiber optic/pneumatic system controls automatic stop, presser foot/top feed retraction and between-work thread cutter functions. Alternative front edge guides facilitate feeding the two plies in registration.

Abstract: A workpiece holding-down device for a sewing machine comprises a spring-loaded presser bar and foot assembly supported in the framework of said sewing machine, a drive mechanism for moving said assembly vertically, and a control circuit for controlling the movement of said presser bar. The foot assembly includes signal means for positioning the presser bar and foot assembly in a controlled position in response to the actuation of an operation member or stored information.

Abstract: Apparatus and method for attaching tags to garments, gloves, handbags and the like includes an assembly for feeding tags from a stacked supply to a tag attaching station, an assembly for affixing the tag to the garment at the tag attaching station, and a control network for controlling and sequencing the tag feed and tag affixing operations. The tag feeding assembly includes a mechanism for gauging the width and thickness of a tag and for adjustably accommodating the same. The assembly also includes a pair of upright arms designed so that a tag having a prepunched hole can be placed with the hole over one of the arms. The other arm may be adjusted relative to the first arm and the positioned tag so that it touches the tag edge. The adjustment of the measuring arm automatically adapts the tag feed mechanism to precisely the required distance necessary to transport the tag from the stacked supply to the tag attaching station.

Abstract: A means for selectively elevating a presser foot out of pressure contact with a work material when a sewing needle extends through the work material. The device includes a needle bar lever pivotally supported by the sewing machine frame and having an operative connection to the endwise shiftable needle bar for implementing oscillation thereof. A lug extending from the needle bar lever may cooperate with the second end of a lift lever having a first end operatively connected with the presser foot of the sewing machine. The lift lever is carried on a selectively shiftable pintle supported by the sewing machine frame, the pintle having a first shiftable position in which the lug extending from the needle bar lever does not engage with the second end of the lift lever and a second shiftable position in which the lug does engage with the second end of the lift lever whereby the lug will effect rotation of the lift lever and have the first end elevate the presser foot out of pressure contact with the work material.

Abstract: A sewing machine having a needle and a presser foot that are reciprocated in synchronism and an arrangement for changing the zone of reciprocation of the presser foot during the reciprocations of the needle and the presser foot.

Abstract: A sewing machine is described having a presser foot lifting arrangement actuated by a presser lifting rock shaft in the sewing machine arm and both a power operated presser lifting device such as a pneumatic cylinder, electric solenoid, or other actuator as well as an operator controlled presser lifter actuator such as a knee shift or the like wherein there is provided linkage means connecting the presser lifting rock shaft in the sewing machine arm with both the operator influenced and power driven actuator. The linkage means is formed with a pair of parallel lost motion slots each embracing a crank pin associated with a respective one of the actuators so that both actuators are connected for independent operation without influence on each other.

Abstract: A sewing machine with a thread cutting device, a pneumatic/automatic presser foot lifter and an air hose attached to the exhaust of the presser foot lift cylinder or its solenoid valve, the air hose directing the air flow to an air jet tube attached to the presser foot shaft behind the needle by a special holder with a single screw simultaneously holding the presser foot to the presser bar lifter. The presser foot lift cylinder and a solenoid valve connected thereto are mounted as a compact unit on a plate, with a piston of the lifting cylinder operatively disposed adjacent to a lifting angle bracket, the latter being connected to the lifting linkage inside the sewing machine. When the solenoid and lifting cylinder are released to lower the presser foot, the exhaust air from the cylinder is forced through the air jet tube up to its open end held by the holder for blowing the thread end above the presser foot.

Abstract: A device for sewing machines for displacing sewn material for a short period of time, comprises a shifting foot which is mounted on a bracket on the main frame of the sewing machine with a parallel linkage. A foot raising and lowering drive mechanism is also mounted on the frame, and it comprises a piston and cylinder combination connected to the linkage for raising the foot upwardly and downwardly. In addition, a foot shifting mechanism is supported on a plate forming a part of the linkage and it includes a piston and cylinder combination which is connected to a lever arm portion of the linkage. The connection includes a piston rod forked end having a small pin which rides in a large diameter bore of the lever arm so as to provide a lost motion for yielding of the shifting foot with the material at times. The lever arm is urged against the pin by a spring which may be adjusted along with end positions of the piston rod.