Abstract: A sewing machine with needle threading device is disclosed, wherein the thread passed through the needle eye of a needle of the sewing machine by operation of a threading hook may be released from the threading hook during a process of the threading hook moving up to the upper initial position after the threading operation is finished.

Abstract: A sewing machine having a free arm which is provided with free arm sensors 5 and 6 for detecting a contact between the free arm and a cylindrical work during embroidery stitching operation, the cylindrical work being held by an embroidering frame 23 and placed on the free arm as covering the same so as to be embroidered thereon. The contact as detected is indicated to the machine user or the sewing machine is stopped. Further, the contact detection may be used to seek an area where the work may be allowed to be embroidered. The area as sought is discriminated prior to initiation of stitching operation if the work may be embroidered in the area.

Abstract: A sewing machine having a threading device is disclosed. The sewing machine comprises a needle bar having a needle attached to a lower end thereof. The needle has a needle eye and a threading shaft has a threading member mounted to the lower end thereof. The threading member has a threading hook, a drive motor for vertically moving the threading shaft along the needle bar, guide means for guiding and rotating the threading shaft at a threading position as the threading shaft is vertically moved, and a regulating member for deciding the threading position of the threading shaft. The threading shaft is moved down and stopped at the threading position and is axially rotated to pass the threading hook through the needle eye. The threading shaft is maintained in this state until a return signal is given such that the drive motor is driven again to pull the threading hook out of the needle eye and move up the threading shaft.

Abstract: A sewing machine is disclosed, wherein a downward pressure normally applied to the presser bar may be optionally adjusted in response to a selected pattern of stitches, and further may be reduced when the presser bar is lifted from the lower operative position to the upper inoperative position, and the operation may be performed smoothly and efficiently.

Abstract: A sewing machine with needle threading device is disclosed, wherein the thread passed through the needle eye of needle of the sewing machine by operation of a threading hook may be released from the threading hook during a process of the threading hook moving up to the upper initial position after the threading operation] is finished.

Abstract: The invention has been made to provide an embroidery sewing machine which may be automatically operated to withdraw the embroidering frame to a predetermined inoperative position. More particularly, in case the power source switch is turned off, the power happens to be in failure, the power cord happens to be disconnected, the sewing operation is interrupted for a predetermined period of time, or the instruction is given to withdraw the embroidering frame to a predetermined inoperative position, the CPU 50 is responsive to these situations to control the X-Y moving mechanism 67 to withdraw the embroidering frame to the predetermined inoperative position.

Abstract: A sewing machine having a free arm which is provided with free arm sensors 5 and 6 for detecting a contact between the free arm and a cylindrical work during embroidery stitching operation, the cylindrical work being held by an embroidering frame 23 and placed on the free arm as covering the same so as to be embroidered thereon. The contact as detected is indicated to the machine user or the sewing machine is stopped. Further, the contact detection may be used to seek an area where the work may be allowed to be embroidered. The area as sought is discriminated prior to initiation of stitching operation if the work may be embroidered in the area.

Abstract: A sewing machine having a threading device is disclosed, the sewing machine comprising a needle bar having a needle attached to the lower end thereof, the needle having a needle eye, a threading shaft having a threading member mounted to the lower end thereof, the threading member having a threading hook, a drive motor for vertically moving the threading shaft along the needle bar, guide means for guiding and rotating the threading shaft at a threading position as the same is vertically moved, a regulating member for deciding the threading position of the threading shaft, wherein the threading shaft is moved down and stopped at the threading position and is axially rotated to pass the treading hook through the needle eye and is maintained in this state until a return signal is given such that the drive motor is driven again to pull the threading hook out of the needle eye and move up the threading shaft.

Abstract: A sewing machine is disclosed, wherein a downward pressure normally applied to the presser bar may be optionally adjusted in response to a selected pattern of stitches, and further may be reduced when the presser bar is lifted from the lower operative position to the upper inoperative position, and the operation may be performed smoothly and efficiently.

Abstract: The invention has been made to provide an embroidery sewing machine which may be automatically operated to withdraw the embroidering frame to a predetermined inoperative position. More particularly, in case the power source switch is turned off, the power happens to be in failure, the power cord happens to be disconnected, the sewing operation is interrupted for a predetermined period of time, or the instruction is given to withdraw the embroidering frame to a predetermined inoperative position, the CPU 50 is responsive to these situations to control the X-Y moving mechanism 67 to withdraw the embroidering frame to the predetermined inoperative position.

Abstract: Disclosed is a device for producing embroidery pattern stitch data, wherein a pattern or patterns may be entered or selected from a memory (3) and the like and optionally positioned. It is discriminated if the selected pattern or patterns may be wholly received in a predetermined stitch area. If the selected pattern or patterns may not be wholly received in the stitch area and partly extend beyond the stitch area, print data may be produced for printing the selected pattern or patterns, and simultaneously for printing reference marks defining the positions and angles of the patterns relative to the work holding frame for holding the work to be stitched.

Abstract: A device for guiding a lower thread in a zigzag stitching sewing machine is provided with a lower thread guiding unit that determines two lower thread drawing positions in accordance with a selected pattern. The lower thread guiding unit includes a lower thread guiding part which, at one of the two positions, acts on the lower thread to guide a lower thread drawing position to a center of a needle amplitude. A lower thread releasing element, at the other of the two positions, cooperates with the lower thread guiding unit to release the lower thread engaged with the lower thread guiding part.

Abstract: Disclosed is an electronic zigzag sewing machine adapted to produce one or more of buttonhole stitch patterns, including several parts to be sequentially stitched, in response to stitch control data stored in a memory unit. The sewing machine includes a vertically extending presser bar, to the lower end of which there is detachably mounted a presser foot for exerting a downwardly directing pressure onto a workpiece. The presser foot is provided with a photo-sensor capable of detecting a longitudinal end of a buttonhole during stitching operation of the buttonhole stitch pattern; a step-up timing, at which one part of the buttonhole stitch pattern proceeds to the next part, can be automatically detected so that the buttonhole stitch pattern can be produced step by step without necessity of manual operation.

Abstract: A sewing machine which stores in a memory stitching control signals for forming stitched patterns, is provided with a stitching pattern indicating device which includes the following: a pattern selecting means for selecting desired patterns from a plurality of stitching patterns; a first indicating memory for storing indication signals in response to stitching patterns selected by means of the pattern selecting means; a manually controlling means for altering forming information of the selected patterns; a second indicating memory for storing indication signals of the stitch forming information adjusted by means of the manually controlling means, and an indicating means connected to the both indicating memories and indicating in response to the selection of the stitching patterns and to the alteration of the stitch forming information.

Abstract: A zigzag sewing machine includes a needle hole member having a round needle hole of a diameter slightly larger than that of a stitching needle. The needle hole member engages a laterally elongated hole in a needle plate and is swingable along the latter. A base member is mounted coaxially with a loop taker and is rotatable relative to the loop taker. The needle hole member is pivoted to the base member for relative vertically swinging movement. A lever swingably mounted on the machine housing engages with the needle hole member, and a cam rotated in synchronism with the vertical reciprocation of the needle is in engagement with the swinging lever. A stepping motor is operatively connected to the needle to reciprocate the needle laterally in the elongated needle plate hole, and the motor is also operatively connected to the base member to reciprocate the base member.

Abstract: In a computer-controlled sewing machine including a standard machine frame and exchangeable electronic control circuit plates inclusive of an operation board, a case for receiving a control circuit plate is attached to the machine frame. The circuit plates and the case are provided with coded keying means in the form of pins and holes to guarantee the fastening of a control plate matching a particular model of the sewing machine.

Abstract: An electronic zigzag sewing machine is provided with a presser foot including a switch lever pivotable between a first and second position. During buttonhole stitching operation the switch lever remains in the first position, but it is shifted to the second position when either one of longitudinal ends of a buttonhole is detected. A photo-sensor is mounted to the presser foot to output a detection signal when the switch lever is in the second position. A pattern number designating a specific stitch pattern of the buttonhole stitches is renewed to the next in response to the detection signal from the photo-sensor. A control system is provided to nullify operation of the photo-sensor during production of bar tacks of the buttonhole stitches so that the pattern number is not renewed in areas of the bar tacks irrespective of output of the detection signal.

Abstract: According to the invention, when a fabric feed device is set to sew a fabric with the straight stitches of smaller feeding amounts (or pitches), a machine operator is not required at first as conventionally to deliberately push the front edge of the fabric forwardly deep between a feed dog and a fabric pressor. The device of the invention is designed to effectively transport and sew the front edge of the fabric at an initial stage of straight stitching of smaller feeding amount. Further according to the invention, an adjustment of smaller feed amount may be effectively carried out in case of button hole stitches and satin stitches.

Abstract: In a computerized sewing machine, initial coordinate values of amplitudes of needle drops (the stitching width) for line-and bar tacks of a buttonhole are stored in a ROM. Desired stitching amplitude values and cut width values are selected by external setting means on the machine and stored in a RAM. The stored desired data are adjusted to coordinates of the present initial values in such a manner that selected needle drop or stitching amplitude values are offset in parallel relative to a center value of a maximum stitching amplitude available in the machine. The widths of stitches of the left-and right line tacks remain unchanged for different cut widths of a buttonhole and only the amplitudes of the bar tack stitches are adjusted to a particular cut width.