A sewing machine capable of replacing a feed dog in accordance with a type of sewing, the sewing machine including a feed bar performing a horizontal motion and a vertical motion by interlocking with a feeding mechanism, a feed dog detachably mounted on the feed bar, and a control unit that identifies the feed dog mounted on the feed bar. In the sewing machine, the feed dog includes an identification member that corresponds to a type of the feed dog, the feed bar includes a sensor that detects the identification member and outputs an identification signal, and the control unit includes a feed dog identifying means that, based on the identification signal from the sensor member, identifies the type of the feed dog mounted on the feed bar.

A long arm quilt and lockstitch machine assembly (1) having a framework having two rail tracks, disposed orthogonally on top of one another, wherein the sewing machine (19) is disposed so as to be displaceable on the rail track lying above. The connections between the drive belt (33, 43) to which the rail track (9) lying below and the sewing machine (19) are connected by way of an electronic control system via drive motors, include overload couplings which in the case of overloading by body parts or items of clothing that are caught between the movable elements separate the movable elements from the drive belts. Advantageously, the overload coupling is simultaneously a connection element and in the case of overloading separates the connection between the elements.

A long arm quilt and lockstitch machine assembly (1) having a framework having two rail tracks, disposed orthogonally on top of one another, wherein the sewing machine (19) is disposed so as to be displaceable on the rail track lying above. The connections between the drive belt (33, 43) to which the rail track (9) lying below and the sewing machine (19) are connected by way of an electronic control system via drive motors, include overload couplings which in the case of overloading by body parts or items of clothing that are caught between the movable elements separate the movable elements from the drive belts. Advantageously, the overload coupling is simultaneously a connection element and in the case of overloading separates the connection between the elements.

The present disclosure discloses an automobile seat cover capable of releasing a safety air bag and a sewing technology of a seat cover. An air bag detonation edge is sewn. The air bag detonation edge is defined on the seat cover side cloth and a sewing position between the seat cover backrest cloth and the seat cover rear cloth. A braid with a width of 4 MM is sewn at the air bag detonation edge through an air bag bottom thread and an air bag upper thread. The common computer automobile is reformed, the number of needles and the needle pitch are strictly controlled by biasys computer software, the tension of the air bag bottom thread and the tension of the air bag upper thread are strictly controlled through a tension controller. The upper half part of the seat cover is integrally sewn.

The present disclosure discloses an automobile seat cover capable of releasing a safety air bag and a sewing technology of a seat cover. An air bag detonation edge is sewn. The air bag detonation edge is defined on the seat cover side cloth and a sewing position between the seat cover backrest cloth and the seat cover rear cloth. A braid with a width of 4 MM is sewn at the air bag detonation edge through an air bag bottom thread and an air bag upper thread. The common computer automobile is reformed, the number of needles and the needle pitch are strictly controlled by biasys computer software, the tension of the air bag bottom thread and the tension of the air bag upper thread are strictly controlled through a tension controller. The upper half part of the seat cover is integrally sewn.

A sewing machine capable of replacing a feed dog in accordance with a type of sewing, the sewing machine including a feed bar performing a horizontal motion and a vertical motion by interlocking with a feeding mechanism, a feed dog detachably mounted on the feed bar, and a control unit that identifies the feed dog mounted on the feed bar. In the sewing machine, the feed dog includes an identification member that corresponds to a type of the feed dog, the feed bar includes a sensor that detects the identification member and outputs an identification signal, and the control unit includes a feed dog identifying means that, based on the identification signal from the sensor member, identifies the type of the feed dog mounted on the feed bar.

A sewing machine capable of replacing a feed dog in accordance with a type of sewing, the sewing machine including a feed bar performing a horizontal motion and a vertical motion by interlocking with a feeding mechanism, a feed dog detachably mounted on the feed bar, and a control unit that identifies the feed dog mounted on the feed bar. In the sewing machine, the feed dog includes an identification member that corresponds to a type of the feed dog, the feed bar includes a sensor that detects the identification member and outputs an identification signal, and the control unit includes a feed dog identifying means that, based on the identification signal from the sensor member, identifies the type of the feed dog mounted on the feed bar.

A sewing machine includes a vertical shuttle and a middle shuttle presser disposed at a front side of the vertical shuttle. The sewing machine includes a presser frame, an optical upper thread detector and a stitch skipping detection processor. The presser frame is movably supported between a pressing position at which the middle shuttle presser is pressed and a retract position separated from the pressing position. The optical upper thread detector is provided at the presser frame and is configured to detect passage of an upper thread using detecting light which passes through passage portions formed in the middle shuttle presser and which crosses a front side of a bobbin case of the vertical shuttle. The stitch skipping detection processor is configured to determine whether the passage of the upper thread is present based on an amount of received light of the detecting light from the upper thread detector.

A sewing machine includes a vertical shuttle and a middle shuttle presser disposed at a front side of the vertical shuttle. The sewing machine includes a presser frame, an optical upper thread detector and a stitch skipping detection processor. The presser frame is movably supported between a pressing position at which the middle shuttle presser is pressed and a retract position separated from the pressing position. The optical upper thread detector is provided at the presser frame and is configured to detect passage of an upper thread using detecting light which passes through passage portions formed in the middle shuttle presser and which crosses a front side of a bobbin case of the vertical shuttle. The stitch skipping detection processor is configured to determine whether the passage of the upper thread is present based on an amount of received light of the detecting light from the upper thread detector.

In an overlock sewing machine, a main shaft fixing operating shaft is provided with a differentiation ring that can be swung in a predetermined range such that, when the rotation of a main shaft is to be enabled, it is set to an enable state in a stationary state, and when the rotation of the main shaft is disabled, it is swung and shifted from the enable position. Furthermore, a looper cover open/closed detection configuration is configured by modifying a part of a typical known configuration. Such an arrangement provides an overlock sewing machine having a simple configuration that requires only a single micro switch to detect the switching between the threading mode and the sewing mode and to detect the open/closed state of the looper cover.