Abstract: A buttonhole forming apparatus includes a cutter, a cutter driving mechanism, and a needle plate. The needle plate has a needle plate base to hold a work cloth thereon and a pair of cutter guides in a recess to guide an edge of the cutter therein. The cutter guides are made of hard material on the inside and rubber on the outside. The hard material can be moved outward by the resilience of the rubber. The width of the cutter hole defined between the cutter guides is set as small as possible so that the cutter does not force the work cloth into the cutter hole when it is lowered where it remains clogged. When the cutter is gradually lowered, the edge of the cutter or a part of the work cloth to be cut makes contact with the tapered portions of the cutter guides, and the rubber is deformed to move the cutter guides outward.

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 holing sewing machine including a workpiece-presser elevating and lowering mechanism which elevates and lowers a workpiece presser, a needle-thread cutting mechanism which cuts a needle thread conveyed by a sewing needle; a bobbin-thread cutting mechanism which draws a bobbin thread from a bobbin and cuts the bobbin thread, an interlocking mechanism which mechanically interlocks the elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, with one another, such that the elevating and lowering mechanism elevates the workpiece presser after the needle-thread cutting mechanism cuts the needle thread and the bobbin-thread cutting mechanism cuts the bobbin thread, a drive source which drives the interlocking mechanism to operate the workpiece-presser elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, the drive source being controllable with respect to a speed of operation thereof to drive the inter

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 a 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 a needle bar and looper base about an axis perpendicular to the X and Y axes, according to stitching data, and wherein the stitching data are compensated by a control device according to a designated one of compensation data sets stored in a compensation data memory.

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: A sewing machine comprises a feeding device which moves between the under position of the cutter apparatus and the under position of the needle bar with a work piece which is set on the feeding device such that the buttonhole slit is formed on a desired position, a setting signal transmitter for transmitting a complete signal when the work piece is set on the feeding device, and a post-buttonhole slit method indicator for indicating the post-buttonhole slit method in order to form the buttonhole slit by the cutter apparatus after buttonhole stitches are formed by the cooperation of the needle and the looper. When the post-buttonhole slit method is indicated by the post-buttonhole slit method indicator, the feeding device moves under the needle bar and the feeding device is controlled so as to stay under the needle bar until the setting signal transmitter inputs the complete signal.

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.