Sewing – Elements – Frames
Patent
1992-01-17
1993-08-03
Crowder, Clifford D.
Sewing
Elements
Frames
D05B 7500
Patent
active
052319423
DESCRIPTION:
BRIEF SUMMARY
A sewing machine is known, in particular from the document EP 337 952 A1 comprising a frame having at least two substantially horizontal arms with which are associated at least one needle bar and its drive mechanism, for the first arm, and at least one feeder mechanism for the material to be sewn and/or a loop captor device for the other arm these arms extending out from the side of a connecting column.
In this type of machine, the frame comprises, on the one hand, a structure of synthetic material, for example of plastics, forming a support base of the machine on which stands at least one support plate and, on the other hand, carried by this plate, a strong framework having the general shape of a U, the limbs of which form, respectively, at least a portion of the first and of the second of said arms and the base of which forms at least a portion of the column.
In one of the forms of embodiment described in the European document cited, the structure of synthetic material has a plurality of recesses for positioning of the framework on the structure, the securing of the former to the latter being effected by clamps which embrace the framework at various locations and are detachably fixed to the structure by screws.
Even though this solution offers every guarantee from a purely mechanical point of view, it is in the context of rationalising the assembly that the essential disadvantage comes to light: in effect even though the manner of fixation of the clamps to the structure of synthetic material may seem both economical and simple to carry out, it must be pointed out that, in use, and especially in the context of manufacture and of series assembly of sewing machines, it is a slow operation, since it requires first of all placing the clamps at the locations prescribed, then positioning the securing screws in the passages provided in these clamps, and then proceeding with the screwing of these screws into the body of the structure of synthetic material.
It should also be pointed out that if, at a later stage, the framework thus mounted has to be separated from the structure for replacement by another framework of the same type, for example as a result of a defect in the first or in one or other of the mechanical parts which this framework is required to carry, the attachment of the new framework will, in many cases, be of a lesser quality than that of the original framework, essentially because it will be necessary to rescrew the screws into the same openings in the support, and, as is known, in such a case it is practically impossible to replace these screws exactly in the helical grooves as they were formed during mounting of the original framework.
The present invention aims to obviate these disadvantages.
The accompanying drawings depict, by way of example and very diagrammatically, an embodiment and two variants:
FIG. 1 is a partially cut away elevation;
FIG. 1A is a section on the line A--A of FIG. 1 and FIG. 1B is a section on the line B--B of this same Figure;
FIG. 2 is a view, to a larger scale, of the portion II of FIG. 1;
FIG. 3 is a sectional view on the line III--III of FIG. 2 and FIG. 3A is a view of a member appearing in FIG. 3;
FIG. 4 is a view similar to that of FIG. 2 depicting a first variant of an embodiment of a portion of the sewing machine according to the invention;
FIG. 5 is a sectional view on the line V--V of FIG. 4 and FIG. 5A is a view of a member appearing in FIG. 5;
FIG. 6 is a view similar to that of FIG. 2 depicting a second variant in embodiment;
FIG. 7 is a sectional view on the line VII--VII of FIG. 6 and FIG. 7A shows a member appearing in FIG. 7. in another working position.
The sewing machine shown in FIG. 1 has a casing 1 formed by assembly of two shells, such as the shell 1a, which also forms one of the two members of the frame of the machine, in the manner described and illustrated in the aforementioned document EP 337 952 A1.
In effect, according to an essential feature both of the machine disclosed by this document and of that according to the present invention, such
REFERENCES:
patent: 2946302 (1960-07-01), Krasnitz
patent: 4274349 (1981-06-01), Doyel
patent: 4552081 (1985-11-01), Vartoukian et al.
patent: 5140918 (1992-08-01), Combepine et al.
Beau Ingeborg
Combepine Michel
Jimenez Antonio
Crowder Clifford D.
Lewis Paul C.
Mefina S.A.
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