Abstract: A sewing machine includes a needle bar, a sewing machine motor, an acquisition portion that acquires a reference length, an image capture portion that generates image data by image capture of one of the sewing object and at least one marker, a computation portion that computes an amount of movement of one of the sewing object and the at least one marker, a speed control portion that sets a revolution speed of the sewing machine motor to not greater than a specified value in a case where it is determined that sewing is being performed in a specified range, and a sewing control portion that terminates the sewing of the stitch portion in a case where it is determined that a length that has been sewn in the reference direction of the stitch portion is not less than the reference length.

Abstract: A sewing machine that includes an image capturing device and a sewing device. The image capturing device captures an image, and the sewing device sews a buttonhole having a length in accordance with a shape of the button, based on an image of a button captured by the image capturing device.

Abstract: A sewing machine includes a needle bar, a sewing machine motor, an acquisition portion that acquires a reference length, an image capture portion that generates image data by image capture of one of the sewing object and at least one marker, a computation portion that computes an amount of movement of one of the sewing object and the at least one marker, a speed control portion that sets a revolution speed of the sewing machine motor to not greater than a specified value in a case where it is determined that sewing is being performed in a specified range, and a sewing control portion that terminates the sewing of the stitch portion in a case where it is determined that a length that has been sewn in the reference direction of the stitch portion is not less than the reference length.

Abstract: A control device of a sewing machine includes a pressing member, a pressing frame supported by the pressing member, feed detecting means for detecting a position or a feeding amount of the pressing frame, a feed dog which feeds the workpiece in the cloth feeding direction every stitch in association with the pressing frame, a feeding motor which sets a cloth feeding amount of the feed dog, a storing portion which stores, in every stitch, an error between a target position or a target feeding amount of the pressing frame and a detected position or a detected feeding amount obtained by the feed detecting means, and control means operable, in every stitch, to determine a correction value from the errors in a plurality of stitches which are stored immediately before, and to control the feeding motor to drive with the cloth feeding amount corrected by the correction value.

Abstract: A sewing machine is provided. The sewing machine includes a needle, a feed dog which feeds a workpiece in a feeding direction, a stitching motor which vertically moves the needle, a needle swinging motor which swings the needle in a direction orthogonal to the feeding direction, a memory in which basic coordinate data of basic buttonhole stitches having a basic stitching width is stored, an input device from which a stitching width is input, and a control device which creates a modified coordinate data based on the basic coordinate data and the stitching width input from the input device, and controls the stitching motor and the needle swinging motor based on the modified coordinate data to form buttonhole stitches having the stitching width input from the input device.

Abstract: A buttonhole sewing machine comprises work piece clamps with a pneumatically actuated displacement drive for displacement relative to each other of the work piece clamps from an initial position of spread by a length of spread into a final position of spread. Only the first work piece clamp is displaceable relative to the x-y table. The displacement of the first work piece clamp is defined between two stop positions. A control unit stores data for triggering an x drive for reversed displacement of the x-y table by half the given length of spread.

Abstract: In a buttonhole sewing machine, a sewing mechanism and a feed bracket are controlled to form a buttonhole defined by settings, such as zigzag stitch length, zigzag pitch, bar-tack length, bar-tack pitch, and cutter space. The buttonhole can be set on the operation panel and changed to various shapes by changing the above settings. In particular, the left and right zigzag stitch widths can be set differently, and the front and rear bar-tack lengths can be also set differently. Thus, the balance of the buttonhole can be finely adjusted.

Abstract: A buttonhole sewing machine for the production of a group of at least two buttonholes of varying design and/or size comprises devices for the entry, storage and processing of information on the varying design and/or size of the group of buttonholes and a device for triggering the drives for the successive production of buttonholes on the workpiece.

Abstract: A sewing machine is provided with an X-correction value input unit that corrects, in an X-direction, seam position with respect to a position of an opening, e.g., a circular hole, formed in a workpiece cloth by an opening forming mechanism, and an X-direction seam data correction unit that corrects seam data based on an X correction value inputted from the X-correction value input unit. The sewing machine can also be provided with an Y-correction input unit and a Y-direction seam data correction unit for correcting Y-direction information in the seam data. With the seam data corrected by the seam data correction units, a seam position can be corrected with respect to the position of the opening formed by the opening forming mechanism.

Abstract: A buttonhole sewing machine including stitching instrumentalities for forming zigzag stitches defining an eyelet-end buttonhole having an eyelet end portion at one end of a foot portion, by operations of a driving mechanism for operating needle and looper device of the stitching instrumentalities, a feeding mechanism for feeding work fabric feeding table along X and Y axes, and a rotating mechanism for rotating needle bar and looper base about an axis perpendicular to the X and Y axes, according to primary stitching data, and wherein a data input device is provided for operation by an operator to specify at least one characteristic of a bar tack portion to be formed at the other end of the foot portion of the eyelet-end buttonhole, and a data generating device is provided for generating tacking data as secondary stitching data on the basis of the specified characteristic or characteristics, to stitch the bar tack portion.

Abstract: In a sewing machine for creating buttonholes, a selection switch is used to designate whether the hole will be cut first or the buttonhole will be defined by stitching first. In both cases, stitch width remains constant. Where the buttonhole is outlined by stitches first, a needle bar bight line is offset by a distance .DELTA.X from the bight line followed when the buttonhole is cut first. The result of the .DELTA.X offset is a spacing equal to 2.DELTA.X between the inner edges of the stitched buttonhole providing space in which to cut the buttonhole.

Abstract: A device for measuring the passage of a predetermined length of cloth at right angles to the needle of a sewing machine comprises a frame carrying an arm mounted about a shaft and urged resiliently towards the cloth by a spring adapted to put a pinion in contact with the cloth. A shaft carries a barrel in contact with a gear fixedly connected to the pinion, the barrel enclosing a spring. The barrel is connected to a terminal by a sliding contact and carries a pin which extends into an arcuate groove in a drum while passing through an arcuate aperture in a plate. Contact elements are disposed at one end of the groove and at one end of the arcuate aperture, the pin being able to move from one to the other of these contact elements. The contact elements press against the internal surface of a metallic ring carried by the drum, the external surface of this ring being connected to a second terminal by a sliding contact.

Abstract: A sewing machine comprising a sewing machine lamp for illuminating an area around an end of a sewing needle, and a plurality of color filters provided on a rotary disk which is rotated by a stepping motor so that the area around the end of the sewing needle is illuminated by light of a selected one of a plurality of different colors. When an abnormal condition detector for detecting an erroneous operation or an abnormal condition such as an accident of the sewing machine detects an abnormal condition, an abnormal condition warning device changes the color of the illuminating light to a color corresponding to a type of the abnormal condition.

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: 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: An electronic sewing machine storing information concerning a string of different stitch patterns includes a central processor responsive to an operator entered parameter for effecting unique modification of certain stored stitch patterns thus creating a compound stitch pattern useful, for instance, as a mending stitch pattern for repairing various length fabric tears.

Abstract: A method of producing a buttonhole is disclosed in which individual legs thereof are composed of stitches alternately extending parallel to the length of the buttonhole and substantially transversely of said length. The stitches extending parallel to said length are formed at twice the stitch length and in the opposite direction of work feed from the transversely extending 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.

Abstract: In each of the trial stitchings for stitching a buttonhole by a computerized sewing machine, an increasing or decreasing amount by which a buttonhole size is to be corrected, is processed through an external input device, and in dependence upon corrected results a subsequent trial stitching is performed, whereby proper buttonhole sizes may be easily obtained.

Abstract: The button hole presser foot engages longitudinally slidably in a frame like slide which is taken along with the sewing material. The slide comprises a cord stretched in the longitudinal direction which encircles the lower end of a shaft of the presser foot shank. At the top end of the shaft is provided an impeller through which a light beam of a light source emerges toward a optoelectric transducer. During the sewing operation the slide moves with the sewing material and it drives the impeller which generates pulses each corresponding to a step of the motion of the sewing material, respectively of the slide. For determining the length of the cords, a determined number of steps, respectively of pulses is counted each time. This permits a reliable and precise determination of the length of the cords.