Sewing – Elements – Needles
Patent
1991-06-13
1992-09-01
Schroeder, Werner H.
Sewing
Elements
Needles
112240, 279 91, D05B 5502, D05B 2912
Patent
active
051430061
DESCRIPTION:
BRIEF SUMMARY
The mounting of tools of very small size, for example drills, punches, needles or any other types of elongate parts, of diameter of the order of 1 mm, or even less, on a driving member, for example a spindle or a needle-bar, in the case of sewing machines or embroidering machines, and in a particularly precisely predetermined position, presents a significant difficulty for many people.
This difficulty arises in particular from awkward manipulation due to the smallness of such objects, and, very often, due to to their shape, which is generally very pointed, hence the potential risk which users may encounter of unpleasant wounds, even dangerous wounds if these objects are rusted.
To this must be added that not everybody is capable of effecting such mounting repeatedly with the precision and speed desired.
The above remarks also apply in the case of replacing one tool by another, in particular when the tool breaks or for the subsequent carrying out of other types of work rendering such a replacement necessary.
Finally, in consideration of the dimensions of the tools in question, which are frequently very small, as in the case of sewing needles, it is obviously difficult to characterise their nature by inscriptions, signs or ideograms that are sufficiently visible, or even complete.
In regard to the field of sewing machines and that of embroidering machines, it may be added that the hole provided for insertion of a needle in the clamp with which the bar is provided very often occupies a position, access to which is relatively difficult, so that it is not uncommon to see users either place the needle into this hole in an angular disposition which is incorrect, or to fail to introduce it completely into the hole.
In regard to the risk of injuring oneself, mentioned above, this arises in paricular in the case of machines having a plurality of needle bars disposed side by side, as is the case in embroidering machines as well as in certain sewing machines, both of the industrial type and the non-industrial type.
Attempts have already been made to obviate the foregoing disadvantages, in particular in the field of sewing machines, by the provision of constructions as numerous as they are varied relating both to the mounting of needles on the needle bar of the machine as well as to the mounting of the presser foot on its support. In particular, such constructions form the subject of Swiss Patent No. 362,301 and U.S. Pat. Nos. 4,359,955; 3,587,498; 3,344,761; 2,985,127; 2,878,765; 2,300,499 and 1,899,303.
The present invention relates more particularly to an assembly for detachably mounting a tool on a driving member of the type described in this last-mentioned document, that is to say an assembly comprising a tool carrier, a mounting head for the tool carrier intended to be connected to said driving member and comprising at least one seat for a corresponding portion of the tool carrier, a device for holding the tool carrier in contact with said portion of the seat, and means establishing, in an univocal manner, the relative position of the mounting head and the tool carrier when the latter is secured to the holding device, an assembly in which said means for univocal positioning comprises at least one stop member preventing any displacement of the tool carrier on the seat, at least in one specific direction, abutment members preventing any displacement of the tool carrier on said seat in any path whatever transverse to said specific direction, and at least one thrust member acting on the tool carrier in the direction for holding it in permanent contact with said stop member, that is to say in said unequivocal position with respect to the mounting head.
In addition to enabling the various disadvantages recited above to be obviated, the assembly according to the invention is especially well suited to miniaturization of the mounting head, and in particular to miniaturization of the tool carrier, which is hardly the case for the device forming the subject of U.S. Pat. No. 1,899,303. In particular, a tool carrier of this k
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Lewis Paul C.
Mefina S.A.
Schroeder Werner H.
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