Stitching patterns overlap to produce a corner-locked stitch pattern. The corner-locked stitch pattern includes one or more thread interlace points, and one or more overlays of threads from overlapping patterns. A network of corner-lock stitch patterns produces a mesh, which may be embroidered into a substrate, such as a medical textile or biotextile. Corner-lock stitch patterns resist puncture-induced and tension-induced deformation of mesh pores between corner-locked stitch patterns, and may be used to modulate compliance and enhance strength properties of a substrate into which they are sewn.

Stitching patterns overlap to produce a corner-locked stitch pattern. The corner-locked stitch pattern includes one or more thread interlace points, and one or more overlays of threads from overlapping patterns. A network of corner-lock stitch patterns produces a mesh, which may be embroidered into a substrate, such as a medical textile or biotextile. Corner-lock stitch patterns resist puncture-induced and tension-induced deformation of mesh pores between corner-locked stitch patterns, and may be used to modulate compliance and enhance strength properties of a substrate into which they are sewn.

Provided is a double-needle lockstitch sewing machine that can easily sew a fabric rolled into a tubular shape by two rows of lockstitch. The double-needle lockstitch sewing machine includes: a pair of needles (9) that reciprocates in an up-down direction; a pair of loop catchers (40) that is arranged respectively corresponding to the pair of needles (9) and that catch loops of needle threads formed by the needles (9) by rotating about hook shafts (41) extending in the up-down direction; a lower shaft (20) that is disposed in front of the needles (9) and the loop catchers (40) in the cloth feeding direction and extends in the left-right direction and that rotates in conjunction with a main shaft (10) that drives the needles (9); and connecting shafts (30) that extend in the cloth feeding direction and are connected to the lower shaft (20) and the hook shafts (41) in a power transmittable manner to rotate. The loop catchers (40) are rotationally driven in conjunction with an up and down movement of the needles (9) as a rotational power of the lower shaft (20) is transmitted to the hook shafts (41) via the connecting shafts (30). Thus, it is possible to easily sew a tubular article with two rows of lockstitch seams.

Stitching patterns overlap to produce a corner-locked stitch pattern. The corner-locked stitch pattern includes one or more thread interlace points, and one or more overlays of threads from overlapping patterns. A network of corner-lock stitch patterns produces a mesh, which may be embroidered into a substrate, such as a medical textile or biotextile. Corner-lock stitch patterns resist puncture-induced and tension-induced deformation of mesh pores between corner-locked stitch patterns, and may be used to modulate compliance and enhance strength properties of a substrate into which they are sewn.

Stitching patterns overlap to produce a corner-locked stitch pattern. The corner-locked stitch pattern includes one or more thread interlace points, and one or more overlays of threads from overlapping patterns. A network of corner-lock stitch patterns produces a mesh, which may be embroidered into a substrate, such as a medical textile or biotextile. Corner-lock stitch patterns resist puncture-induced and tension-induced deformation of mesh pores between corner-locked stitch patterns, and may be used to modulate compliance and enhance strength properties of a substrate into which they are sewn.

Provided is a double-needle lockstitch sewing machine that can easily sew a fabric rolled into a tubular shape by two rows of lockstitch. The double-needle lockstitch sewing machine includes: a pair of needles (9) that reciprocates in an up-down direction; a pair of loop catchers (40) that is arranged respectively corresponding to the pair of needles (9) and that catch loops of needle threads formed by the needles (9) by rotating about hook shafts (41) extending in the up-down direction; a lower shaft (20) that is disposed in front of the needles (9) and the loop catchers (40) in the cloth feeding direction and extends in the left-right direction and that rotates in conjunction with a main shaft (10) that drives the needles (9); and connecting shafts (30) that extend in the cloth feeding direction and are connected to the lower shaft (20) and the hook shafts (41) in a power transmittable manner to rotate. The loop catchers (40) are rotationally driven in conjunction with an up and down movement of the needles (9) as a rotational power of the lower shaft (20) is transmitted to the hook shafts (41) via the connecting shafts (30). Thus, it is possible to easily sew a tubular article with two rows of lockstitch seams.

With an overlock sewing machine set to an interlock state and the upper blade in an interlock position, upon turning the operating shaft toward one side around its axis, an interlock switching mechanism displaces the other end portion of a rod and sets an interlock release state. A pressing portion presses a first switching portion to swing a swing member toward the forward swing side, which displaces the upper blade to retraction position. With the state set to interlock release with the upper blade in retraction position, upon turning the operating shaft toward one side around its axis, the pressing portion presses a second switching portion to swing the swing member toward the reverse swing side, which displaces the upper blade to interlock position. The interlock mechanism displaces the other end portion of the rod to set the state to interlock.

With an overlock sewing machine set to an interlock state and the upper blade in an interlock position, upon turning the operating shaft toward one side around its axis, an interlock switching mechanism displaces the other end portion of a rod and sets an interlock release state. A pressing portion presses a first switching portion to swing a swing member toward the forward swing side, which displaces the upper blade to retraction position. With the state set to interlock release with the upper blade in retraction position, upon turning the operating shaft toward one side around its axis, the pressing portion presses a second switching portion to swing the swing member toward the reverse swing side, which displaces the upper blade to interlock position. The interlock mechanism displaces the other end portion of the rod to set the state to interlock.

An overlock sewing machine includes an operating shaft that is slidable between first and second positions, and configured such that interlock switching and position switching mechanisms are operated when it is turned. The interlock switching mechanism includes a rotor that is rotatable together with the operating shaft as a single unit, an interlock switching member, and a first engagement target portion formed in the rotor. In the interlock state, setting the operating shaft to the first position engages an engagement portion of the interlock switching member with the first engagement target portion, which restricts operating shaft rotation. Sliding the operating shaft to the second position releases the engagement state between the engagement and first engagement target portions, enabling rotation of the operating shaft.

An overlock sewing machine includes an operating shaft that is slidable between first and second positions, and configured such that interlock switching and position switching mechanisms are operated when it is turned. The interlock switching mechanism includes a rotor that is rotatable together with the operating shaft as a single unit, an interlock switching member, and a first engagement target portion formed in the rotor. In the interlock state, setting the operating shaft to the first position engages an engagement portion of the interlock switching member with the first engagement target portion, which restricts operating shaft rotation. Sliding the operating shaft to the second position releases the engagement state between the engagement and first engagement target portions, enabling rotation of the operating shaft.