Sewing – Work manipulating – Guides
Patent
1986-04-29
1987-04-07
Hunter, H. Hampton
Sewing
Work manipulating
Guides
112308, 112DIG2, D05B 3510
Patent
active
046551506
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for the automatic alignment of the contours of plies to be conveyed one upon the other to the sewing station where they are sewed on one another. The device can be also used to guide only one ply towards the sewing station, for example, when the sewing of an edge, an embroidery or the like has to be made. The device according to the present invention is designed to have the function of essential fitting for industrial sewing machines because it produces considerable advantages in the sewing industry as far as both the quality of the hand-made goods and the productivity are concerned and also for the presence of a new aligning system. Some devices and appliances designed to this end are already know. However, they generally are integral with mechanic sewing machines which are very complicated.
Furthermore they have poor adaptability to the various kind of processing or manufacture and are provided with complicated control means and aligning means which do not assure an optimum result for every kind of goods to be sewed.
The present invention seeks to obviate the above mentioned inconveniences by means of a device that besides being of simple construction and convenient operation assures a better result regardless of the material characteristics.
Another aim of the present invention is that of providing a device operating as an universal guide which aligns the contours of plies and is applicable to the most dissimilar sewing machines.
The device of the invention is of easy use, not very cumbersome, accurate and designed to be included in and excluded from the processing.
The device according to the present invention consists essentially of three superimposed, generally rectangular blades which are hinged at one end and have the form of a double pliers, the three suitably shaped blades engaging in pairs two plies to be sewed together and guiding the contours thereof so that said contours are parallel and laid one upon the other. From the end where the hinge pin is places onwards the device comprises spring means which can be calibrated and are able to push the middle blade against the lower blade, and the upper blade against the middle blade. It is also possible to provide elastic means to oppose the weight of the blades.
The application area of the elastic force pushing the blades towards one another is near the hinge axis because the edges of the fabric have to travel almost without friction between the respective pairs of blades. The engaging area of the blades i.e. the operation area of the guides, is formed by the end of the three blades which is opposite to the hinge axis, said area being provided, as shown later on, with means to make the alignment easier and being limited by abuting means against which the plies to be aligned are beating. In the device, after the above mentioned elastic means a mechanism is provided which is able to oppose the action of said elastic means causing the opening of the blades so as to make the initial insertion of the plies to be aligned and sewed easier and causing then their closing up to the position of the selected calibration which is carried out by means of controlling the maximum and minimum opening angle of the blades under working condition.
The contours of the plies are inserted so that the upper contour enters between the upper blade and the middle one, while the lower contour enters between the middle blade and the lower one.
To better intend the features and the advantages of the present invention a preferred non-limitative embodiment and some variants thereof are described with reference to the accompanying drawings, wherein:
FIG. 1 is a top view of the device according to the preferred embodiment of the present invention;
FIG. 1a is the spread out flat view of FIG. 1,
FIG. 2 is the longitudinal section of the device taken along the broken line A--A of FIG. 1 and showing the device under preliminary condition before the operation;
FIG. 3 is a section similar to the previous one but showing the device under working co
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