Abstract: Provided is a sewing machine that can be reduced in size by employing a simple configuration for a feed dog drive device. A lateral feed drive unit (8) and a vertical drive unit (9) transmit rotation of a drive shaft (7) to a feed dog (3). The feed dog (3) is supported by a swingable feed base (5). A square piece (18) is provided at a lower end of a raising and lowering link (15) of the vertical drive unit (9). A guide member (19) including a guide groove (20) configured to guide the square piece (18) is disposed right under the feed base (5). An upper end of the raising and lowering link (15) is connected to a part of the feed base (5) between the swinging shaft (6) and the feed dog (3).

Abstract: Provided is a sewing machine that can be reduced in size by employing a simple configuration for a feed dog drive device. A lateral feed drive unit (8) and a vertical drive unit (9) transmit rotation of a drive shaft (7) to a feed dog (3). The feed dog (3) is supported by a swingable feed base (5). A square piece (18) is provided at a lower end of a raising and lowering link (15) of the vertical drive unit (9). A guide member (19) including a guide groove (20) configured to guide the square piece (18) is disposed right under the feed base (5). An upper end of the raising and lowering link (15) is connected to a part of the feed base (5) between the swinging shaft (6) and the feed dog (3).

Abstract: The present invention provides a thread feeding device of a decorative stitching sewing machine. The thread feeding device feeds a needle thread, an upper looper thread, and a lower looper thread in the amounts required for sewing one stitch such that the position of a stitch looping point of the threads changes.

Abstract: The present invention provides a thread feeding device of a decorative stitching sewing machine. The thread feeding device feeds a needle thread, an upper looper thread, and a lower looper thread in the amounts required for sewing one stitch such that the position of a stitch looping point of the threads changes.

Abstract: A sewing machine needle is attached, fixed or exchanged to a needle clamp firmly and easily.

Abstract: A sewing machine needle is attached, fixed or exchanged to a needle clamp firmly and easily.

Abstract: A sewing machine threading device includes: hermetic lips capable of making hermetic contact with a peripheral band-ring-shaped region of needles surrounding thread exits of needle eye, and which further includes a peripheral band-ring-shaped pad which surrounds suction port holes which draw in air from the thread exits of the needle eyes; a needle thread suction conduit pipe connected to the suction port holes; a position switching mechanism which moves the hermetic lips to a threading position such that the hermetic lips are in contact with the needle with the suction port holes being aligned with the thread exits, and, when forming a stitch, retracts the hermetic lips from the needle and moves said hermetic lips to a standby position; and a pump which takes in one end of the thread to be inserted into thread entrances of the needle eyes.

Abstract: A sewing machine needle is attached firmly and easily, and is fixed and exchanged.

Abstract: Provided is a sewing machine threading device, comprising: hermetic lips (7a-7e) which are capable of making a hermetic contact with a peripheral band-ring-shaped region (22) of needles (1a, 1b, 1e-1g) which surrounds thread exits (5a-5e) of needle eyes (1-1d, 1h-1j) of the needle, and which further comprises a corresponding peripheral band-ring-shaped pad (24) which surrounds suction port holes (6a-6e) which draw in air from the thread exits of the needle eyes of the needles; a needle thread suction conduit pipe which is connected to the suction port holes of the hermetic lips; a position switching mechanism which, when threading the needle, moves the hermetic lips to a threading position such that the hermetic lips are in contact with the needle with the suction port holes being aligned with the thread exits of the needle eyes of the noodle, and, when forming a stitch, retracts the hermetic lips from the needle and moves said hermetic lips to a standby position; and a pump which, with the needle thread suct

Abstract: A sewing machine needle is attached firmly and easily, and is fixed and exchanged.

Abstract: An engaging clutch for respectively transmitting power from a sewing machine motor to a drive shaft driving a stitch forming device including the looper at the time of the stitch formation or to the gas supply source at the time of the looper threading comprises a structure which is moved to one of a gas supply drive member which transmits the power to the gas supply source and a stitch forming drive member which is fastened to one end of the drive shaft and transmits the power to the stitch forming device so that approach/separation becomes free depending on a manual operation of a looper threading/stitch forming changeover manual operating portion and transmits the power from the sewing machine motor through a clutch hollow shaft and retains a connecting state when connecting to the gas supply drive member.

Abstract: When lifting and lowering the presser-foot by either of the manual operation lever and the knee operation lifter, the composition of the lifting and lowering mechanism can be simplified, the number of parts can be reduced and the production can be performed easily. The present invention is provided with a presser bar lifting and lowering mechanism (30) which has: a lifter operating plate which is disposed upon a pedestal (2a) which supports an arm (2) upon a bed (3) and which is vertically movable depending on a vertical movement operation of a manual operation lever (31); a pivot rod in which one end is joined to the lifter operating plate via a first joining link; and a presser-foot bar lifting and lowering plate which is joined to a second joining link which is joined to the other end of the pivot rod, and which is joined to the presser-foot bar via a presser bar holder which is fixed to the presser-foot bar.

Abstract: When lifting and lowering the presser-foot by either of the manual operation lever and the knee operation lifter, the composition of the lifting and lowering mechanism can be simplified, the number of parts can be reduced and the production can be performed easily. The present invention is provided with a presser bar lifting and lowering mechanism (30) which has: a lifter operating plate which is disposed upon a pedestal (2a) which supports an arm (2) upon a bed (3) and which is vertically movable depending on a vertical movement operation of a manual operation lever (31); a pivot rod in which one end is joined to the lifter operating plate via a first joining link; and a presser-foot bar lifting and lowering plate which is joined to a second joining link which is joined to the other end of the pivot rod, and which is joined to the presser-foot bar via a presser bar holder which is fixed to the presser-foot bar.

Abstract: A safety device is not required for avoiding a transition to a stitch forming state from a looper threading state during a gas supply operation of a gas supply pump, and a threading can be performed more easily with one-touch operation to a looper by one-handed operation of small number of times on the operation for being simplified on mechanism.

Abstract: A thread can be captured surely by the thread capturing open eye of a needle and a stitch can be formed in the space within a machine bed. A handstitch on the front surface of a fabric workpiece and a locked stitch on the back surface are formed as a skip-stitch set by cooperation of a open eye needle (13), a rotary hook (200) comprising a rocking bobbin casing (205) loaded in a rotative outer rotary hook (202), and a thread draw out actuator (401). In the first stroke of the open eye needle (13), a stitch length feed of the fabric workpiece for handstitch is performed by a feed dog (601). In the second stroke of the open eye needle (13), an inter-stitch pitch feed of fabric workpiece for inter-handstitch is performed by a feed dog (601).

Abstract: A sewing thread (20) can be captured certainly with a thread capturing open eye (13a) of an open eye needle (13) and the stitches are formed in the inner space of a sewing machine bed (3). A handstitch and a locked stitch are formed, respectively, on the front surface and the back surface of a fabric workpiece (21) as a skip stitch set through cooperation of the open eye needle (13), a shuttle hook (200) and a thread draw out actuator (401). A feed dog (601) feeds the fabric workpiece by a stitch length (P1) for handstitch during a first stroke of the open eye needle (13), and feeds the fabric workpiece by an inter-stitch pitch (P2) between the handstitches during a second stroke of the open eye needle (13).

Abstract: A thread can be captured surely by the thread capturing open eye of a needle and a stitch can be formed in the space within a machine bed. A handstitch on the front surface of a fabric workpiece and a locked stitch on the back surface are formed as a skip-stitch set by cooperation of a open eye needle (13), a rotary hook (200) comprising a rocking bobbin casing (205) loaded in a rotative outer rotary hook (202), and a thread draw out actuator (401). In the first stroke of the open eye needle (13), a stitch length feed of the fabric workpiece for handstitch is performed by a feed dog (601). In the second stroke of the open eye needle (13), an inter-stitch pitch feed of fabric workpiece for inter-handstitch is performed by a feed dog (601).

Abstract: In a cover stitch sewing machine which forms double chain stitch seams, needle threads are pulled out from the needle thread tensioning devices, passing over a thread hanging point on a needle thread pulling-up spring and the needle thread take-up completes drawing-up of the needle threads after needle thread loops of the respective needles are seized by the looper. The sewing material is then fed one feed pitch as the needles are moved down and the needle thread take-up draws out the needle threads, while the needle threads are pulled up at the thread hanging point by the elasticity of the needle thread pulling-up spring, thus preventing slack in the needle threads below the needle thread eyes. The threads which are connected with the needle thread loops, are drawn up by the thread hanging point of the needle thread take-up against the resiliency of the needle thread pulling-up spring.