JPH0372879U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a side view showing the structure of the overlock sewing machine according to the present invention, Fig. 2A is a top view showing the position of the key looper when performing a one-needle, three-thread overlock stitch, and Fig. Figure 2B is a side view of this, Figure 3A is a top view showing the position of the key looper when performing single needle, two thread overlock stitches, Figure 3B
4 is an exploded perspective view illustrating the installation of the key looper, and FIG. 5 is a side view of FIG. 3B showing the state when the key looper and the upper looper are engaged.
A cross-sectional view taken along line A', and FIG. 6 is an exploded perspective view showing another embodiment of the key looper. 5... Sewing machine needle, 6... Upper looper, 9... Lower looper, 5a, 6a, 9a... Thread eye hole, 11... Key looper.

Claims (1)

[Claims for Utility Model Registration] 1. One-needle, three-thread overlock stitch performed using three threads passed through an upper looper, a lower looper, and a needle; In an overlock sewing machine that can switch between single-needle, two-thread overlock stitches that are performed using two threads, the key looper is configured such that when the tip of the key looper engages the thread hole of the upper looper, the tip of the upper looper It is composed of an elastic body that forms a hook shape with the upper looper to capture the lower looper thread, and when it comes out of the upper looper's eye hole, it retracts to a predetermined position due to its elasticity. When sewing, the tip of the key looper is engaged with the thread hole of the upper looper, and when sewing one needle and three threads, the edge stitching is performed by removing it from the thread hole of the upper looper. Overlock sewing machine. 2. The overlock sewing machine according to claim 1, wherein the key looper is detachably attached to the upper looper attachment shaft.