Abstract: A sewing machine is provided with a function of adjusting a thread margin remaining on a cloth side to be sewn to a desired amount. A sewing machine includes a cutting member and a thread length adjustment mechanism. The cutting member cuts an upper thread and a lower thread between a hole of a needle plate and the cutting member. The thread length adjustment mechanism adjusts the length of the upper thread and the lower thread extending from the hole of the needle plate up to the cutting member.

Abstract: The activation for a path and time related motion of a thread cutting and lead-in stitching unit (7) and the thread brake (25) occurs by a cam drive driven by the primary shaft (9) and a cam drum (75) arranged on the upper shaft (17). This way, an absolute synchronization of the elements of the thread cutting and lead-in stitching unit (7), the thread brake (25), and the hook as well as the needle is ensured.

Abstract: In a sewing machine having an automatic thread cutting mechanism, a situation of a thread cutting operation is detected in power-OFF to continuously carry out a proper operation when a power supply is turned ON again after sudden power-OFF. In a sewing machine having an automatic thread cutting mechanism, there is provided means for detecting an operation situation of the automatic thread cutting mechanism when a power supply is turned ON. Based on a signal for the detection, the automatic thread cutting mechanism is operated to complete a thread cutting operation and to carry out a control to return into an initial state when a stop is performed with the thread cutting mechanism in power-ON executing the thread cutting work.

Abstract: A thread cutting device includes a thread catching member having a catching portion, wherein the thread catching member moves back and forth across a path of a lower thread reeled out from a bobbin so as to catch the lower thread by the catching portion and cuts the lower thread by cooperating with a fixed knife, a first power transmitting portion which transmits a power to the thread catching member, a first cam member provided on a lower shaft rotated by a sewing machine motor and transmits a first moving force to the thread catching member through the first power transmitting portion, a second power transmitting portion which transmits a second moving force from a stepping motor to the thread catching member through the first power transmitting portion.

Abstract: A thread cutting device includes a thread catching member having a catching portion, wherein the thread catching member moves back and forth across a path of a lower thread reeled out from a bobbin so as to catch the lower thread by the catching portion and cuts the lower thread by cooperating with a fixed knife, a first power transmitting portion which transmits a power to the thread catching member, a first cam member provided on a lower shaft rotated by a sewing machine motor and transmits a first moving force to the thread catching member through the first power transmitting portion, a second power transmitting portion which transmits a second moving force from a stepping motor to the thread catching member through the first power transmitting portion.

Abstract: Disclosed is an automatic thread cutting device for a sewing machine which is provided with a horizontal loop taker, wherein a thread catching member (4) is operated in response to a thread cutting instruction to reciprocatingly move with a movable blade (5) along a predetermined course, the thread catching member (4) normally catching the upper thread when moving in the return-way of reciprocation to guide the upper thread to a fixed blade (14) which is provided to cut the upper thread in cooperation with the movable blade (5), and wherein a thread regulating means is provided to cut the lower thread (29d) together with the upper thread, the thread regulating means being operated to press down the lower thread (29d) to a position where the lower thread (29d) is caught by the thread catching member (4) in addition to the upper thread when the thread catching member (4) is moving in the return-way of reciprocation.

Abstract: A wiper device includes a trimmer to trim an needle thread, a needle bar mounted so as to be vertically moveable and having a sewing needle attached in the lower end, a wiper member to wipe the needle thread extending from an eye of the sewing needle as to pull the needle thread above the upper surface of work cloth after trimming the needle thread, a wiper driving unit to actuate the thread wiping movement of the wiper member and a switch unit to switch the wiper member between an operable state and an inoperable state in conjunction with the position of the needle bar.

Abstract: An automatic thread cutting apparatus for sewing machines to cut off a thread and hold the remaining portion of bottom yarns after sewing operation is completed includes a thread cutter, a linkage mechanism and a driver. The thread cutter includes a cutting blade and an upper and a lower fixed blade. The cutting blade has a first cutting section and a second cutting section. When the driver provides power to drive the linkage mechanism, the cutting blade is swung between the upper and lower fixed blades. The thread is cut off by the first cutting section and the bottom yarns are cut off by the second cutting section and held for use in the successive sewing operation without the need of redoing yarn threading.

Abstract: An apparatus for preventing the raveling of a seam wherein a looper thread hanging hook for catching a looper thread which is allowed to pass through a loop of a needle thread immediately before the completion of a sewing operation and a driving mechanism of the hook together with a mechanism for cutting the looper thread and the needle thread are arranged on the right side of a needle drop point of a sewing machine.

Abstract: A cloth cutting knife 16 is structured such that the length of the cutting edge thereof is set shorter than the length of the side sewing portions of a buttonhole to be formed, and a buttonhole having a length corresponding to the length of the right and left side sewing portions can be formed by moving up and down the cloth cutting knife 16 two or more times. The cloth cutting knife 16 is moved up and down at least once during formation of the stitches of the right and left side sewing portions. Also, the cloth cutting knife 16 is moved up and down once each time a given number of stitches of the right and left side sewing portions are formed. The given number of stitches is set in accordance with both of the length of the cutting edge of the cloth cutting knife 16 and the length of the buttonhole to be formed.

Abstract: A multi-head embroidery machine includes a plurality of embroidery machines each of which includes thread cutting means, sewing means, thread breakage detecting means, needle bar jumping means and a cloth holder frame, a sewing motor for driving the sewing means of the embroidery machines in common, a frame holder for holding the cloth holder frames of the embroidery machines in common, cloth feeding means for moving the frame holder, stop control means for stopping the sewing motor to interrupt a sewing operation of the sewing means, step-back control means for stepping back via the cloth feeding means the frame holder to an actual or estimated position of occurrence of a thread breakage, re-sewing control means for executing a re-sewing operation approximately to a sewing interruption position in the embroidery machine in which thread breakage has occurred, while the cloth feeding means is being operated, thread-cutting command means for commanding to cut at least one of a needle thread and a bobbin thread

Abstract: An upper thread-hooking method for industrial sewing machines uses an upper thread-hooking device installed above one side of the needle and the presser foot for hooking the thread and cutting with a cutter by means of an electronic component moving a main sway arm and an auxiliary sway arm. The hooking device is located between the needle eye and the needle point behind the needle, performing a hooking thread process so that the hooking member never occupies the gap between the needle point and the presser foot. Then the sewing machine may have the highest rising level for the presser foot for comparative thick cloth to be sewn, without possibility of the hooking member colliding with the needle or the presser foot.

Abstract: The fabric-side hook thread end (GN), which was previously longer than the fabric-side needle thread end (NN) by the amount corresponding to a stitch length, is to be shortened in sewing machines with a thread-cutting device. This object is accomplished by the feed device of the sewing machine, of which there is at least one, performing a partial feed step in the reverse feed direction during the performance of the thread-cutting process.

Abstract: A cutting system for a sewing machine is disclosed. The cutting system may include a pattern cam that does not have a stopping lug or a stopping groove. The pattern cam may have two faces having substantially equal circumferences. The cutting system may comprise a pneumatically actuated, computer-controlled means for activating and positioning the moveable cutting blade which cuts both the upper needle and lower bobbin threads of a sewing machine. The pattern cam may have a stopping signal device to achieve existing timings of the sewing machine's hook and to determine the home position of the pattern's first stitch. Microprocessor-based signals may be used to count programmed stitches and pulses while reading the signals from the cam to send signals to control a manifold which opens solenoids in a series of synchronized controlled air flow forces to activate and position the moveable cutting blade which cuts both the upper needle and lower bobbin threads of sewing machine.

Abstract: A sewing machine includes a plurality of needle bars for performing stitching with multiple needle threads. The needle threads have diameters, tenacity, and stretchability different from one another. Sewing parameters inherent to each of the needle threads are beforehand determined. The parameters are maximum sewing speed, thread breakage sensitivity, thread residual amount, needle-rotary hook meet angle, workpiece fabric feed timing, and feed pitch. A spindle motor, a thread cutting motor, a rotary hook drive motor, an X-axis motor, and a Y-axis motor are controlledly driven based on the selected parameters inherent to the just used needle thread.

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

Abstract: A sewing data converting device includes a storage means for storing sewing data used in one embroidery machine for executing a sewing operation including an embroidering operation. The sewing data is converted into another sewing data used in another embroidery machine having a data format differing from one of the one embroidery machine. Display data for the converted sewing data is originated so that the display data corresponds to a display format of the another embroidery machine.

Abstract: An embroidery machine having a spindle, a sewing machine motor driving the spindle, and a thread cutting device including a thread cutting motor and a thread cutting mechanism provided with a movable blade driven by the thread cutting motor. The thread cutting motor is provided independently of the sewing machine motor and is driven so that the movable blade is moved in synchronism with the spindle. The movable blade is movable between a maximum pivot positioned farthest from a stationary blade and a stand-by position close to the stationary blade.

Abstract: A sewing machine capable of cutting only a needle thread without cutting a bobbin thread during the middle of stitching operation for changing the needle thread with another needle thread. A thread cutting motor is driven independent of a sewing machine motor. A rotary hook control unit is provided for controlling rotation of a rotary hook as well as driving mode of the thread cutting motor in relation to a rotation of a spindle. A thread cutting mechanism including a movable blade pivotably driven by the thread cutting motor is provided between the rotary hook and a throat plate. If the movable blade is moved from its maximum pivot position to a stand-by position, both needle thread and bobbin thread are cut at the final number of stitch. If the movable blade is moved from a needle thread cutting position to the stand-by position, only the needle thread can be cut.

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 or embroidering machine is provided with a thread-cutting device and a signal transmitter representing the angular position of the arm shaft. The drive of the catch thread device is acted upon as a function of the signals generated by the signal transmitter according to a movement program stored in a memory. The path data of this movement program are in a defined relation to the rotary movement or the current angular position of the hook. The drive of the catch thread device is part of a regulating device operating as a cascade control or of a control device operating as a path plan control. Due to the exact agreement in time between the movement process of the catch thread device and the course of the rotary movement of the hook, the thread-cutting process can now also be carried out during the phase of deceleration of the sewing machine, so that an inexpensive, uncontrolled motor can now be used to drive the sewing machine.

Abstract: An under thread supply apparatus for a sewing machine comprises a bobbin case, a bobbin exchange device, a thread removal device and a winding device. The bobbin case is removably set to a shuttle of the sewing machine and accommodates a bobbin with the thread wound thereon. The bobbin exchange device takes the bobbin case out of the shuttle, and set the bobbin case accommodating the bobbin with the thread wound anew therearound to the shuttle. The thread removal device removes the thread from the bobbin accommodated in the bobbin case which is taken out. The winding device winds a preset amount of thread around the bobbin after the thread is removed therefrom.

Abstract: A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.

Abstract: A thread cutting device in a sewing machine includes a movable knife which is movable across a space between a throat plate and a shuttle positioned below the throat plate so as to perform a thread cutting operation. A lower thread retreating lever is movable from a waiting position to an operative position for retreating a lower thread taken out from the shuttle to a position out of a thread cutting orbit of the movable knife. The thread cutting device is operable in either a thread cutting mode for cutting both an upper thread and a lower thread or a thread cutting mode for cutting only the upper thread by selectively positioning the lower thread retreating lever at either the waiting position or the operative position during the operation of the movable knife. An actuator and an interlocking mechanism between the actuator and the lower thread retreating lever are provided for driving the lower thread retreating lever. The actuator and the interlocking mechanism are positioned rearwardly of the shuttle.

Abstract: An under thread supply apparatus for a sewing machine comprises a bobbin case, a bobbin exchange device, a thread removal device and a winding device. The bobbin case is removably set to a shuttle of the sewing machine and accommodates a bobbin with the thread wound thereon. The bobbin exchange device takes the bobbin case out of the shuttle, and sets the bobbin case accommodating the bobbin with the thread wound anew therearound to the shuttle. The thread removal device removes the thread from the bobbin accommodated in the bobbin case which is taken out. The winding device winds a preset amount of thread around the bobbin after the thread is removed therefrom.

Abstract: A two-needle sewing machine includes first and second sewing needles for performing two stitching operations at the same time; a motor for driving the first and second sewing needles; first and second thread cutting mechanisms provided for the first and second sewing needles, respectively, for cutting threads at the ends of the stitching operations; a first actuator and a second actuator for driving respective ones of the first and second thread cutting mechanisms; and a thread cutting control circuit which stores data corresponding to the timing of a first thread cutting drive signal to the first actuator and the timing of a second thread cutting drive signal to the second actuator, both signals corresponding to rotational speeds of the motor, and which, according to the data and the rotational speeds of the motor, applies the first and second thread cutting drive signals to the first and second actuators at different times defined by the data.

Abstract: A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.

Abstract: A sewing machine having a motor drive operating in response to a controller to rotate in forward and reverse rotation directions. A jogging angle may be set and the drive operated automatically for rotation in forward and/or reverse directions as a function of various operating conditions so that the needle is stopped in an optimum position for piercing a material.

Abstract: A sewing machine apparatus and method for sewing a label to a thick, puffy, or quilted mattress is disclosed. The apparatus includes a pair of clamps attached to a carriage, a cutter and nipper disposed above the carriage, and a controller for controlling the sewing machine and carriage.

Abstract: A thread trimming device for a lockstitch bar tacking sewing machine is equipped with a thread trimming unit comprising a detecting member which is rotatably supported by a sewing machine body and has a detecting portion, a first position detecting means which is fixedly mounted on said sewing machine body in such a way as to be capable of facing the detecting portion of the detecting member and which produces a thread trimming signal for starting thread trimming when the detecting portion approaches thereto and a driving unit for driving a thread trimming cam link in such a way as to bring the contact portion of a thread cam link in contact with the cam surface of a thread trimming cam for trimming a needle and a bobbin threads based on the thread trimming signal. As a result, the mechanical components thereof becomes simple in structure and easy in adjustment, and those relating to the thread trimming operation are improved in durability.

Abstract: A control apparatus for an embroidery sewing machine performs thread trimming with certainty after a thread is cut upon replacing of the thread in the course of an embroidery sewing operation or upon completion of an embroidery sewing operation. The control apparatus detects the position of a movable frame and determines the thread trimming moving direction in which the movable frame is to be moved for thread trimming in accordance with the position of the movable frame and a movable area of the movable frame. In thread trimming, the control apparatus moves the movable frame in accordance with the moving direction and a movement distance for thread trimming.

Abstract: A sewing machine is provided with an automatic anti-loosening-stitcher mode selector switch for activating and deactivating the anti-loosening-stitcher mode in which anti-loosening-stitches are formed after the completion of a stitch pattern, and an automatic thread-cutter mode selector switch for activating and deactivating the thread-cutter mode in which threads are cut after the completion of a stitch pattern. When only the automatic thread-cutter mode selector switch is operated to set the thread-cutter activated mode, a CPU sets automatically both the anti-loosening-stitcher activated mode and the thread-cutter activated mode to form anti-loosening-stitches after the completion of a stitch pattern before cutting the threads so that stitches forming the end portion of the stitch pattern are prevented from loosening.

Abstract: A thread control apparatus having first and second thread retainer or holder mechanisms on a thread path, a feed passage control mechanism adapted to obtain the thread in a zig zag form between the first and second thread holder mechanisms, and a controller actuated to allow these holder mechanisms to be in a thread hold condition and a thread release condition, respectively, just before starting thread cutting or trimming operation. Slack is provided in the thread by deactuating the feed passage control mechanism after the thread has been delivered from the thread supply source by operation of the feed passage control mechanism. The thread is released by the first thread retainer mechanism and held by the second thread retainer mechanism until the next sewing operation is started upon trimming or cutting the thread to render the thread path longer by means of the feed passage control mechanism, thereby drawing back the residual thread.

Abstract: An upper thread holding device for use in a sewing machine having a body and a needle from which an upper thread depends, the device includes a holding member pivoted to the body and movable between a waiting position and an upper thread holding position in such a manner that the holding member passes an upper thread taken-off position located between the needle and the waiting position, a driving device for moving the holding member, a stationary blade connected to the body so as to be in sliding engagement with a lower surface of the holding member and designed for cutting the upper thread in cooperation with the holding member in its return movement at the waiting position, and a press plate fixed to the stationary blade and defining a space therebetween in which the holding member is accommodated in its waiting position for holding between the press plate and the holding member.

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 double-stitch sewing machine is provided which, in a preferred embodiment, includes a throat plate and feed dog with a needle opening for supporting a material to be sewn, a reciprocating needle to penetrate the material, the needle having an eyelet for insertion of a needle thread, the needle being able to penetrate through the sewn material and carry the needle thread through the needle opening, a rotating hook for pulling on the needle thread after insertion of the needle thread through the needle opening, forming a loop in the needle thread with a first leg of the loop being joined with the sewn material and the needle and a second leg of the loop being joined only with the sewn material, a bobbin carrier mounted within the rotating hook having an adjacent clearance with the rotating hook, allowing the rotating hook to cause the needle thread to be brought underneath the bobbin carrier, the bobbin carrier dispensing bobbin thread in cooperation with the rotating hook pulling of the needle thread, a firs

Abstract: In a sewing machine, when the depressed condition of a foot pedal is changed from a forward depressed condition for high speed sewing to a reverse depressed condition for thread cutting, a braking circuit decreases the rotational speed of the machine motor from a high speed to a low speed. The rotational speed is detected by an encoder. When the rotational speed detected by the encoder becomes a threshold medium speed or less, and a needle-down signal is generated from a needle position detector, the CPU of the sewing machine outputs a work fabric feed pitch control start signal to a work fabric feed pitch selector. The work fabric feed pitch selector reduces or nullifies the feed pitch of the work fabric. Under this condition, in response to the next needle-down signal, the CPU operates a thread cutting mechanism to cut the needle and bobbin threads.

Abstract: A sewing machine-driving apparatus forms an accurate and stable seam at a first stitch in a conventional double chain stitch or covering chain stitch sewing machine. Its motor is controlled so as to drive the sewing machine in a direction reverse to that of the usual sewing operation for a limited time period between the completion of a thread cutting operation and a point of time when the sewing machine needles reach their needle-down position. Thus, the stitching needles reach their lowest points without scooping a looper thread at the first stitch; assuring the formation of a stable and accurate seam in the second stitch.

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 thread trimmer for a pattern sewing machine is disclosed. When the pattern sewing machine forms patterns, a pattern is connected to a next pattern by a crossover thread. The thread trimmer automatically cuts a specified portion of the crossover thread. Therefore, the operator can avoid the troublesome and time-consuming cutting of the crossover thread manually with scissors. Furthermore, the sewing efficiency of the pattern sewing machine is enhanced.

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

Abstract: A pattern sewing machine provided with a thread trimmer and a thread delivery unit. After a series of patterns is completed and the thread trimmer trims thread, the thread delivery unit is prohibited from delivering thread until the next sewing operation starts to form another pattern. When the patterns are distant from each other, a needle bar is disconnected and fabric is fed a distance in a non sewing operation. No excess thread is delivered corresponding to the feeding distance of the fabric, thus preventing thread from being wasted. Furthermore, an operator can avoid the cutting of excess thread with scissors. The sewing efficiency is thus enhanced. In the pattern sewing machine the crossover thread connecting the patterns is automatically cut regardless of the distance between the patterns.

Abstract: A device includes a driving device for driving an upper shaft. A moving blade is connected to the driving device via a clutch mechanism so as to be rotated by the driving device during on-condition of the clutch mechanism. A stationary blade cuts a thread held by a holding member in cooperation with the moving blade. A detecting device stops driving of the driving device based on a signal indicating the terminating of the moving blade while the moving blade and the driving device are connected. A range detecting device detects the rotation range of the upper shaft when the driving device is stopped based on a signal from the detecting device. A restarting device restarts the driving device based on a signal from the range detecting device.

Abstract: A sewing machine having a needle thread cutting unit and a needle thread holding device for holding a cut leading end portiion of the thread drawn from an eye of a needle. The needle thread holding device includes a holding means provided at the pressure foot. The holding means is movable between a needle thread clamping position and a needle thread releasing position. The holding device also includes drive means connected to the holding means for selectively moving the holding means to one of the needle thread releasing position and the needle thread clamping position, pressure foot position detection means for detecting a position of the pressure foot, needle position detector for generating a needle position signal indicative of the upper needle position and the lower needle position, and control means connected to the pressure foot position detection means the sewing machine energization signal generating means and the needle position detector.

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 provided with a thread cutting mechanism and a needle thread tension release mechanism. Normally, the needle thread is subjected to a proper tension by a thread tension regulating mechanism. However, at an initial start-up period of the sewing operation, the needle thread tension is released by the tension release mechanism for a first predetermined period during which a needle thread loop is trapped by a loop taker. Further, the sewing machine is provided with a thread holding member for holding a leading end portion of the needle thread. The holding member is movable to its thread release position after elapse of a second predetermined period at the initial start-up period of the sewing operation. The first predetermined period is within the second predetermined period.

Abstract: A thread cutting unit cooperating with the bed of a sewing machine includes a lower shaft, a cutting knife and a loop spreading plate respectively fixed to the lower shaft and positioned adjacent to the hook. The thread cutting knife and the loop spreading plate cross each other in a space between the hook and the throat plate. The thread cutting unit is provided with a thread cutting driving unit which comprises a thread cutting knife driving shaft, a loop spreading plate driving shaft, a rotational motion transmission device, a thread cutting supporting member carrying thread cutting knife, a first turnable interlocking mechanism and a second turnable interlocking mechanism. The thread cutting supporting member is rotatably supported on the bed.

Abstract: In a sewing machine, immediately after every thread trimming, the electric motor is reversely rotated for a predetermined angle, hence reversely rotating the sewing mechanism, so that the needle bar is brought up to its upper dead point when the electric motor is stopped after the thread trimming, and, thereby, there is no fear of spoiling the object cloth by the needle tip. The predetermined angle is controlled by processing an output signal of a speed detector.

Abstract: An ornamental thread automatic cutting device of a flat plural-needles sewing machine. Ornamental thread can be cut automatically at the same time as needle thread and looper thread are cut and a cut end of ornamental thread just after passing the eyelet is gripped mechanically upon cutting to facilitate the succeeding sewing operation.

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.