Sewing – Elements – Starting or stopping
Patent
1990-06-11
1993-01-12
Nerbun, Peter
Sewing
Elements
Starting or stopping
112220, 307154, 318551, D05B 6918
Patent
active
051780836
DESCRIPTION:
BRIEF SUMMARY
The appearance on the market of computer-controlled electronic sewing machines has only very slightly modified the dimensions and general aesthetics of the machine. Although the machines have become much more efficient than conventional mechanically-controlled machines, inter alia machines controlled by cams which are much bulkier in proportion than the "solid state" memories which have replaced them, their casings have remained practically unchanged with regard to their general shape and the volume of their essential parts--i.e. the bottom arm and the top arm and, more particularly, the column connecting the arms.
The aforementioned memories now occupy much less space, and this has enabled numerous manufacturers to dispose them on thin "boards" for forming complete circuits which are so reduced in thickness and area that they can be directly secured e.g. to the column or upper arm of the machine. However there has been practically no decrease in the overall dimensions of the motor and supply transformer which are disposed inside the casings of all machines, and consequently these basic components still determine the size and design of the casing.
Furthermore, since it is absolutely necessary to supply the electronic components of the machine with a low voltage of the order of a few tens of volts, it is necessary to use one or more electric transformers. These of course were not present in prior-art electromechanical machines and they are relatively heavy since they are also designed to deliver the power required for operating the electric motor or motors driving the machine.
The result is that a computer-controlled sewing machine, as compared with an electromechanical sewing machine only a few years old, is as big or even bigger and also and more particularly is heavier, thus increasing the requirements on maintenance and transport, as regards the manufacturer, wholesalers and retailers.
The aforementioned disadvantage is also felt by the user, particularly when the machine is stored in a place difficult of access such as a high shelf.
The aforementioned basic components and the associated electric circuit must also be adapted, for a given model of machine, to the voltage and supply frequency characteristics of the various networks to which sewing machines may be connected. As is known, these characteristics may differ greatly from one country to another, and the same applies to the safety requirements in some countries or groups of countries.
Manufacturers who wish to introduce their products into a large number of countries are therefore forced, in the case of a given model of sewing machine, to manufacture as many types of machines as there are types of requirements on voltage and/or main frequency and/or safety standards to be met by the machine in the chosen countries. This requirement, of course, makes it difficult to rationalize the production chains and warehousing of machines.
As for the user of a sewing machine constructed in accordance with very specific local conditions as regard current supply and safety, he is practically forced to change the machine as soon as he wishes to set up in another region, where the conditions are so different from those from which the machine was designed that it becomes defective or even dangerous in operation unless the electric parts are modified--a particularly laborious and risky operation.
The invention aims precisely to obviate all the aforementioned disadvantages and accordingly proposes a sewing machine designed so as to free the manufacturer and user from the aforementioned aesthetic, practical and economic constraints.
They will now be described with reference to the drawings given by way of example and in which:
FIG. 1 is a three-quarter elevation of a sewing machine according to the invention;
FIG. 2 is a partial view of the electric circuit of the machine, according to a first embodiment;
FIG. 3 is a view similar to FIG. 2, according to a second embodiment, and
FIG. 4 is a block diagram of a part of the electric circuit of the sewing machine accordin
REFERENCES:
patent: 3736479 (1973-05-01), Soeda
patent: 3898542 (1975-08-01), Current
patent: 4098206 (1978-07-01), Suchsland et al.
Patent Abstracts of Japan, vol. 4, No. 170 (E-35) 652 Nov. 22, 1980 A-55-117493.
Patent Abstracts of Japan, vol. 6, No. 103 (E-112) 981 Jun. 12, 1982 A-57-34795.
Combepine Michel
Duret Henri
Jimenez Antonio
Matthey Jacques
Mefina SA
Nerbun Peter
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