Sewing – Work manipulating – Guides
Patent
1998-09-18
2000-09-05
Izaguirre, Ismael
Sewing
Work manipulating
Guides
D05B 3508
Patent
active
061126837
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention refers to a semi-automatic dart sewing set.
BACKGROUND OF THE INVENTION
The automatic dart sewing units of the prior art do have several drawbacks since, during the dart sewing operation, fabrics are held to the working surface by means of a counter clamp while sliding over the surface.
The result is that fabrics are not steadily held during the sewing operation and, consequently, darts often turn out irregular in shape and size.
A further drawback is that the automatic dart sewing units do not carry out the sewing of darts at a distance of 10 to 15 millimeters from a pocket opening in trousers or skirts since, because of their structure, it is not possible to hold fabrics to the plate which carries them under the counter clamp by which, in turn, the fabrics are held to the working surface.
More generically, the units do not allow fabrics to be quickly applied nor to be easily positioned under the needle of the sewing machine.* sewing labels, that solve the problem to easily change the sewing template whenever the type of label to be sewn on the workpiece is changed.
SUMMARY OF THE INVENTION
The present invention chiefly aims at providing a device to be applied to a semi-automatic sewing machine, by which it is possible to overcome the above drawbacks.
More generically, the invention aims at providing a means which makes it easier to carry out darts sewing by using a semi-automatic sewing machine, so as to multiply the uses of this type of machines while making easier the commercialization thereof.
Therefore, the invention solves the problem of the semi-automatic darts sewing by using a set which facilitates the accurate and rapid positioning of fabrics under the needle of the sewing machine and which, by avoiding the sliding of the fabrics over the working surface, allows them to be steadily held under said needle.
Moreover, the invention allows the set to get automatically blocked to the devices of the sewing machine which carry out the lifting and the positioning upon the work surface; the invention also allows fabrics to be automatically ejected at the end of the operation.
BRIEF DESCRIPTION OF THE DRAWINGS
The set and its application are illustrated by the enclosed drawings in a preferred embodiment likely to be improved, the drawings showing respectively:
FIGS. 1A and 1B shows the translation plate and a side-view of the plate;
FIG. 2A shows a side-view of a flat lanc, or rather, of the shaped tool, on which fabrics get folded, and the first guide member which allows the rapid blocking thereof to the feed mechanism of the sewing machine;
FIG. 2B shows a top view of the flat lance illustrated in FIG. 2a;
FIG. 3A shows a side-view of the plate like rod and the second guide member;
FIG. 3B shows a top view of the counter clamp;
FIG. 4 shows the translation plate with the flat lance and plate-like rod positioned so as to carry out the sewing operation;
FIG. 5 shows the fabric on which a dart has been sewn;
FIG. 6 shows the fabric having reference marks in the area where the dart is to be sewn;
FIGS. 7A-D show the four phases of the dart sewing process;
FIG. 8 shows a cross-sectional side view of the phase shown in FIG. 7B of phase b) of the above process;
FIGS. 9A and 9B show respectively plan and side views of the set made up of the translation plate, the flat lance and the counter and plate-like rod intended for straight closed darts;
FIG. 10 shows the closed dart sewn by means of the set illustrated in FIG. 9A and 9B.
FIG. 11 shows the translation plate intended for straight open darts;
FIG. 12 shows the flat lance and the plate-like rod to be applied to the translation plate illustrated in FIG. 11;
FIG. 13 shows the dart sewn by means of the set shown in FIGS. 11 and 12;
FIG. 14 shows the flat lance and the plate-like rod to be applied to the plate shown in FIG. 11 so as to carry out the dart sewing in proximity to pockets openings in trousers or skirts;
FIG. 15 shows the dart sewn by means of the clamp and the counter flat lance shown in FIG. 14;
FIG. 16A show
REFERENCES:
patent: 354101 (1886-12-01), Couchois
patent: 385560 (1888-07-01), Laubscher
patent: 870219 (1907-11-01), Boye
patent: 4079682 (1978-03-01), Nishiwaki
patent: 5148760 (1992-09-01), Miyauchi
patent: 5261340 (1993-11-01), Conley, Jr. et al.
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