JPS60139281A - Rolled hemming cloth press fitting for sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] A conventional three-wrap cloth presser metal fitting for a sewing machine is shown in FIGS.
As shown in Figure 4, an inner winding vane is cast integrally with the main body at the lower part of one of the forked parts at the front of the main body a, and an outer winding vane C molded from a thin steel plate is caulked onto the other upper part. It looked above the inner windings.

However, when caulking the outer winding blade C, the 13th
As shown by the chain line in the figure, the front shaft of the outer winding blade C is caught by the teeth and deforms the winding blade C. The annular gap formed by the blade C and the inner winding blade superimposed inside it is the first
As shown by the solid line in Figure 4, it is technically extremely difficult to caulk the outer winding blades C to the main body a so as to be uniform from the inlet side to the outlet side of the fabric, and this is not suitable for mass production.

Furthermore, in Japanese Patent Application Laid-Open No. 52-139550, the outer winding blades are overlapped so as to hold the inner winding blades, and one side of the outer winding blades is integrally connected to the main body using a drawing die. It is stated that the blades and outer winding vanes are made of the same material as the main body, but since the outer winding vanes overlap so as to hold the inner winding vanes, they must be made of the same material as the main body even if a drawing die is used. This is absurd and technically impossible.

Moreover, with these conventional three-wrap cloth pressers, the outer winding blades overlap the inner winding blades, making it difficult to inspect whether the fabric is accurately held in the three-wrap state by the inner and outer winding blades. be.

The present invention is an invention of a three-wrap cloth presser metal fitting for a sewing machine, which aims to improve these points, make it possible to easily inspect the three-wrap state of cloth, and enable mass production by casting.

The present invention will be explained with reference to FIGS. 1 to 10 of the drawings.
An outer winding blade 3 that bulges out in an arc shape from the upper part of one side 1 of the forked tip of the main body a to the upper part of the other side 2 is installed integrally with the main body, and the other side at the front and back of the outer winding blade 2
A front inner winding vane 4a and a rear inner winding vane 4b are provided at the lower part of the winding blade 4, with the outer winding vane 3 interposed therebetween, so as to protrude integrally with the other side 2, respectively.

However, according to the present invention, when one end of the cloth shown by the broken line in FIG. 6 is bent upward into a cylindrical shape and fed to the forked portion at the tip of the main body a, the cloth is first fed from the front inner winding blade 4a on the inlet side. The three-wrap cloth that is guided to the lower surface of the outer winding blade 3 and then first comes out from the outer winding blade 3 is guided to the rear inner winding blade 4b on the exit side and is sewn at the needle hole 5.

In this way, according to the present invention, as is clear from the second open plan view, the inner winding blades 4a and 4b extend in front and behind the outer winding blade 3 without overlapping, so that the operator can remove the cloth by using the inner and outer winding blades. It can be easily inspected to see whether the end portion is accurately holding the three-wound state.
Since it is built integrally with the main body over the other side 2 from the - side 1 of the fork at the tip, both sides 1 and 2 are long and slender, and the distance between both sides 1 and 2 is wide for ease of inspection. Not only is there no risk of distortion, but the forked portion can be formed deeply to shorten the distance between the rear end H and the needle hole 5, so the three-wrap cloth can be sewn immediately. It prevents deformation, and since the inner and outer winding blades do not overlap and are integrated with the main body a, the whole can be easily cast into one body using zinc alloy or synthetic resin by splitting the upper mold M and the lower mold N, allowing for mass production. It produces the effect of being suitable.

Note that the width Y of the guide groove of the sewn three-wrap cloth continuous with the needle droplet 5 on the back side of the main body a should be made slightly larger than the width X of the three-wrap cloth on the exit side of the rear inner winding blade 4b. is preferred. When Y>x in this manner, the sewn three-wrap cloth is smoothly pressed by the main body a of the presser foot, and wrinkles do not occur.

Moreover, if the inward projecting piece 6 is placed at the bottom of the tip of the side edge 1 toward the inlet side of the cloth in front of the front inner winding blade 4a, the upward end of the cloth bent into three turns will form on one side l. - to prevent it from penetrating into the bottom of the

The one-dot chain line in FIG. 10 indicates the interface between the upper die M and the lower die N, the two-dot chain line indicates the outline of the product, and the white area indicates the cavity into which the zinc alloy or synthetic resin flows.

[Brief explanation of the drawing]

1 to 9 show examples of the present invention, in which FIG. 1 is an overall perspective view of the product of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a bottom view, and FIG. 5 is a sectional view taken along line B-B, FIG. 6 is a front view taken along line C-C, and FIG. 7 is a sectional view taken along line D-
D line sectional view, Figure 8 is E-B line sectional view, Figure 9 is F-F
10 is a sectional view showing the casting state of the product of the present invention, FIGS. 11 to 14 show the conventional product, FIG. 11 is an overall perspective view, and FIG. 12 is an exploded perspective view of the product. FIG. 13 is a vertical side view, and FIG. 14 is a vertical front view. (2) is one side, 2 is the other side, 3 is the outer winding blade, and 4a and 4b are the front and rear inner winding blades, respectively. Agent Maki Tobe (and 2 others) - Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 7 Yaeta Zta4 Figure 11 Figure 13 Figure 14

Claims (1)

[Claims] An outer winding blade that bulges in an arc shape from the top of one side of the two-pronged tip of the main body a to two parts of the other side is installed integrally with the main body, and the other side of the front and back of the outer winding blade is A three-wrap presser foot fitting for a sewing machine comprising a front inner winding blade and a rear inner winding blade, each protruding from the other side with an outer winding blade in between.