A sewing machine includes a feed dog partially protruding out up and down from a throat plate to feed a workpiece, a sewing needle configured to perform stitch points on the workpiece by moving up and down, and a shuttle configured to capture an upper thread passed through the sewing needle below the throat plate to be entwined with a lower thread. The feed dog includes a top plate having teeth formed on an upper surface thereof, and a support portion to which a feed operation relative to the top plate is input. The top plate includes an insertion hole that the sewing needle penetrates up and down, and a pair of wall portions extending in an up-and-down direction respectively on one side and another side in a feed direction of the workpiece relative to the insertion hole on a lower surface side of the top plate.

A sewing machine includes a feed dog partially protruding out up and down from a throat plate to feed a workpiece, a sewing needle configured to perform stitch points on the workpiece by moving up and down, and a shuttle configured to capture an upper thread passed through the sewing needle below the throat plate to be entwined with a lower thread. The feed dog includes a top plate having teeth formed on an upper surface thereof, and a support portion to which a feed operation relative to the top plate is input. The top plate includes an insertion hole that the sewing needle penetrates up and down, and a pair of wall portions extending in an up-and-down direction respectively on one side and another side in a feed direction of the workpiece relative to the insertion hole on a lower surface side of the top plate.

A sewing machine is provided, which has lower feed teeth which feed a sewing object by a lower feed drive mechanism having a lower drive shaft 92 as a drive source and upper feed teeth which are driven by an upper feed shaft that is coupled to and driven by the lower feed drive mechanism. The sewing machine is provided with an upper feed lower shaft 1 which is supported rotatably on a machine main body and is coupled to the lower feed drive mechanism, an upper feed coupling section which transmits movement of the upper feed lower shaft to the upper feed shaft, and a transmission control section which controls halting and restarting of transmission of movement of the upper feed lower shaft. The upper feed coupling section is held at a movement transmission halt position by operation of the transmission control section.

A sewing machine is provided, which has lower feed teeth which feed a sewing object by a lower feed drive mechanism having a lower drive shaft 92 as a drive source and upper feed teeth which are driven by an upper feed shaft that is coupled to and driven by the lower feed drive mechanism. The sewing machine is provided with an upper feed lower shaft 1 which is supported rotatably on a machine main body and is coupled to the lower feed drive mechanism, an upper feed coupling section which transmits movement of the upper feed lower shaft to the upper feed shaft, and a transmission control section which controls halting and restarting of transmission of movement of the upper feed lower shaft. The upper feed coupling section is held at a movement transmission halt position by operation of the transmission control section.

Various examples are provided related to transporting and sewing material in, e.g., automation of sewing robots. An automated sewing process feed control system is disclosed in which a material aligner is utilized. An omni-chain material aligner can include a circular roller chain in which the rollers allow for a controlling force to be applied to a material. An omni-belt material aligner can include a belt with attached perpendicular rollers which allow feed control and active motorized steering control. The material aligner can control the pressure applied onto the material to facilitate control of feeding the material.

A kit for adding or replacing an automated upper walking foot stepping height adjustment to a sewing machine, the kit includes a mounting assembly including an actuator bracket, an actuator coupled to the actuator bracket, a drive assembly, and a needle drive assembly. The actuator includes an actuator shaft that extends and retracts. The drive assembly includes a drive shaft, a drive arm coupled to the drive shaft and the actuator shaft, and a guide coupled to the drive shaft. The needle drive assembly includes a variable drive crank coupled to the guide and configured to couple to a needle drive shaft of a sewing machine. Selectively extending and retracting the actuator shaft selectively adjusts a stepping height of an upper walking foot.

A kit for adding or replacing an automated upper walking foot stepping height adjustment to a sewing machine, the kit includes a mounting assembly including an actuator bracket, an actuator coupled to the actuator bracket, a drive assembly, and a needle drive assembly. The actuator includes an actuator shaft that extends and retracts. The drive assembly includes a drive shaft, a drive arm coupled to the drive shaft and the actuator shaft, and a guide coupled to the drive shaft. The needle drive assembly includes a variable drive crank coupled to the guide and configured to couple to a needle drive shaft of a sewing machine. Selectively extending and retracting the actuator shaft selectively adjusts a stepping height of an upper walking foot.

In a sewing machine, a switching mechanism is coupled to a slide arm of a transmission mechanism included in an upper feed mechanism. When the switching mechanism is operated, the slide arm is switched between a transmission state in which the driving force of a driving cam is transmitted to a feed link mechanism and a non-transmission state in which the driving force of the driving cam is not transmitted to the link mechanism 61. This allows the switching mechanism to switch the slide arm 60A to the non-transmission state. This allows the operation of the feed link mechanism to be suspended, and allows the upper-lower movement of an upper feed dog to be suspended. Accordingly, this contributes to a reduction in vibration and noise in the sewing machine.

Various examples are provided related to transporting and sewing material in, e.g., automation of sewing robots. An automated sewing process feed control system is disclosed in which a material aligner is utilized. An omni-chain material aligner can include a circular roller chain in which the rollers allow for a controlling force to be applied to a material. An omni-belt material aligner can include a belt with attached perpendicular rollers which allow feed control and active motorized steering control. The material aligner can control the pressure applied onto the material to facilitate control of feeding the material.

A sewing machine includes: a presser spring depressing a presser bar; a presser main body fixed thereto, including a presser; a lower feed dog protruding further upward than a needle plate, to feed a sewing target rearward; an upper feed mechanism above the lower feed dog, that includes an upper feed dog behind a needle location and feeds the sewing target rearward via the upper and lower feed dogs; and a spring presser release mechanism relatively movably mounted on the presser bar, including a transmission member transmitting presser spring force to the presser bar, and operating when the lower contacts the upper feed dog, lifting the transmission member relative to the presser bar, to release the force applied thereto. The movement of the transmission member with respect to the presser bar during spring presser release mechanism operation matches a movement of the lower feed dog protruding from the needle plate.