Abstract: A thread take-up lever switching mechanism can switch the operation of a thread take-up lever which is interlocked with an upper shaft. The thread take-up lever switching mechanism includes: a cylindrical cam provided on the upper shaft, the cylindrical cam having a plurality of cam surfaces; a contact portion provided on the thread take-up lever, the contact portion contacting a first surface of the plurality of cam surfaces; and a switch for switching the contact portion from a first position of contacting the first surface of the plurality of cam surfaces to a second position of contacting a second surface of the plurality of cam surfaces.

Abstract: [Purpose] To obtain a sewing machine comprising a device with which it is possible to easily perform a threading operation in which a needle thread is inserted into the needle hole of the sewing machine needle, wherein the sewing machine comprises a threading device configured so that the needle thread does not drop onto or coil around an operation part (operation part) of the operation lever of the threading device when a thread-hooking operation is completed before insertion of the needle thread. [Configuration] The present invention comprises: a needle bar 52; a threading shaft 53; a thread-holding tool 71; a threading tool 72 provided at the bottom end of the threading shaft 53; an operation lever 4 that has an operation part 41 and moves the threading shaft 53 up and down and rotates the threading shaft in the circumferential direction; and a cutting tool 93 for the needle thread n.

Abstract: A thread take-up lever switching mechanism can switch the operation of a thread take-up lever which is interlocked with an upper shaft. The thread take-up lever switching mechanism includes: a cylindrical cam provided on the upper shaft, the cylindrical cam having a plurality of cam surfaces; a contact portion provided on the thread take-up lever, the contact portion contacting a first surface of the plurality of cam surfaces; and a switch for switching the contact portion from a first position of contacting the first surface of the plurality of cam surfaces to a second position of contacting a second surface of the plurality of cam surfaces.

Abstract: 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.

Abstract: [Purpose] To obtain a sewing machine comprising a device with which it is possible to easily perform a threading operation in which a needle thread is inserted into the needle hole of the sewing machine needle, wherein the sewing machine comprises a threading device configured so that the needle thread does not drop onto or coil around an operation part (operation part) of the operation lever of the threading device when a thread-hooking operation is completed before insertion of the needle thread. [Configuration] The present invention comprises: a needle bar 52; a threading shaft 53; a thread-holding tool 71; a threading tool 72 provided at the bottom end of the threading shaft 53; an operation lever 4 that has an operation part 41 and moves the threading shaft 53 up and down and rotates the threading shaft in the circumferential direction; and a cutting tool 93 for the needle thread n.

Abstract: 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.