JPS6245657Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to an upper feed device in an overlock sewing machine having an upper feed mechanism.

[Conventional technology]

Conventionally, in this type of overlock sewing machine, when feeding the cloth S in the cloth feeding direction to overlock the cloth edge, the inner side S ₁ away from the cloth edge is connected to the upper feed dog 1 and the lower feed dog (not shown). At this time, the fabric edge stitching part _S2 is pinched by the lower surface of the presser foot 2 and the upper surface of the throat plate (not shown), so the friction between them causes The feed amount of the cloth edge stitching part S ₂ is smaller than that of the inner side part S ₁ of the fabric S, and an inward force acts between the fabric S inner side part S ₁ and the cloth edge stitching part S ₂ , and the fabric Pull the hem S ₂ inward. Then, the cloth edge moves from the two-dot chain line in FIG. 2 to the position shown by the solid line and is deflected inward. As a result, in the fabric edge overlocking part _S2 , the overlocking seam shifts outward from the fabric edge as shown in Figure 2, and after sewing is completed, the fabric edge returns to its original position (the position indicated by the two-dot chain line in Figure 2). Returning to the method, as shown in Figure 3, the overseams were bent and beautiful overseams were not formed, resulting in a product with low commercial value.

[Purpose of invention]

The purpose of this invention is to prevent the fabric edge from shifting inward by providing an upper feed dog 1a facing the cloth edge overlocking part _S2 where the overlock seam is formed, thereby obtaining a clean overedge seam. do.

[Structure and action of the device]

An embodiment of this invention will be described below based on the drawings.

In Fig. 4, 1 is an upper feed dog, and an upper feed dog 1a is provided on the side near the cloth edge facing the cloth edge stitching part _S2 of the cloth S, 3 is an upper knife, 4 is a lower knife, and 5 is a lower knife. It is the needle plate.

When overlocking the edge of the cloth S with the upper feed device of the overlock sewing machine having such a configuration, after shearing the edge of the cloth S placed on the throat plate 5 with the upper knife 3 and the lower knife 4, The upper feed dog 1 is fed in the cloth feeding direction by sandwiching the inner side _S1 of the cloth S with the lower feed dog (not shown), and the upper feed dog 1a facing the upper surface of the lower knife 4 and the cloth edge stitching part _S2 . By sandwiching the cloth hem S ₂ and moving the upper feed dog 1a in the cloth feed direction, the cloth hem S ₂ is sent in the cloth feed direction.

At this time, the fabric hem S ₂ is fed by the same feed amount as the inner side S ₁ of the fabric S, so the edge stitch of a constant width is neatly made along the fabric edge without the edge of the fabric shifting inward. It can be formed on the edge _S2 .

[Effects of the invention] As explained above, this invention has a material hem stitching section S ₂ in a hem sewing machine with an upper feed mechanism.
By providing an upper feed device with an upper feed dog 1a facing the , when feeding the cloth S in the cloth feeding direction to perform overlock stitching, the overlocking portion S ₂ of the cloth S is separated from the inside portion S ₁ of the cloth S. It is possible to feed the same amount of material, preventing the occurrence of crooked hem stitches due to deviation of the fabric edge,
It has an excellent effect in forming beautiful overlock seams and obtaining products with high commercial value.

[Other Examples]

FIG. 5 shows another embodiment of the present invention, in which the upper feed dog 1a facing the cloth edge overlocking portion _S2 is made separate, and a long hole (not shown) is provided at the base of the upper feed dog 1a in the direction perpendicular to the cloth feed direction, and the long hole is made expandable and contractible by a pair of screws 6 loosely fitted into the long hole. When the upper knife 3 and the lower knife 4 are moved in response to a change in the overlocking width, the upper feed dog 1 is moved in response to the change in the overlocking width.
Allowing a to move has the same effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the conventional example, Figs. 2 and 3 are explanatory diagrams of the operation of the conventional example, Fig. 4 is a sectional view of this invention with some parts omitted, and Fig. 6 is a FIG. 5 is a plan view of this invention, and FIG. 5 is a side view of another embodiment. In the figure, 1, 1a... Upper feed dog, S...
Cloth, S ₁ ... Inner part of cloth, S ₂ ... Cloth hem part, 2
. . . Presser foot, 5 . . . Throat plate.

Claims (1)

[Claims for Utility Model Registration] Throat plate 5 having a flat surface for holding the cloth, cloth presser foot 2 capable of pressing the cloth onto the throat plate, and working in cooperation with the lower feed dog to pinch the cloth and move the cloth in the cloth feeding direction. In a hem sewing machine equipped with an upper feed dog 1 that is fed to the fabric feed direction, and an overlock mechanism that overlocks the edge of the fabric fed in the fabric feed direction along the fabric edge, the upper feed opposite to the fabric hem S ₂ is An upper feed device for an overcut sewing machine characterized by the provision of teeth.