Sewing – Work manipulating – Guides
Patent
1992-12-09
1995-01-31
Crowder, Clifford D.
Sewing
Work manipulating
Guides
D05B 3506
Patent
active
053851072
DESCRIPTION:
BRIEF SUMMARY
This invention concerns what is commonly called, in the sewing field, an attachment. More precisely, this attachment is meant to shape a strip of fabric and to bring it folded to the proximity of the needle of a sewing machine to form a decorative border on the edge of a piece of fabric.
An accessory intended to form a border is generally called a border maker and has a body for guiding the strip of fabric in which the strip arrives flat, is gradually furrowed to form a U while one of its two edges are gradually lifted to form, at the base of the branches of the U, what is commonly called the tucks. At the outlet of this guide body, the strip of fabric is drawn perpendicularly to its trajectory, to turn back on itself around ridges that constitute the beveled end of the guide body. The U thus formed is completely turned upside down, so that the tucks which, in the guide body, were situated at the end of the branches of the U, are now inside the branches of this U, which comes at the same time to overlap the piece of fabric just in front of the needle of the sewing machine.
FIG. 1A in the attached drawings shows, in cross-section, the strip of fabric B possessing two creases R and overlapping the edge of a piece of fabric T just before it passes under the needle of a sewing machine C.
All known devices for performing this type of operation are generally specialized and adapted to a specific type of border (with one or two tucks of specific size, able to accommodate and guide only one specific fabric strip width. . .) with the result that it is necessary to have a large number of accessories to perform several sewing operations of this type.
This invention intends to remedy this problem of the multiplicity of a accessories by proposing a guiding device that makes it possible, by simple means, to adapt a single accessory to do various jobs.
For this purpose, the invention concerns a device for guiding a strip of fabric to the proximity of the needle of a sewing machine, intended to impress in this strip a crease on itself to form a border overlapping the edge of a piece of fabric. This device includes, in a known manner, a body for guiding the strip with an inlet part and a shaping part, which shaping part contains outside wings for lifting the edges of the strip, which converge in the direction in which this strip is moving, and a middle part that defines a U-shaped channel, the branches of which are increasingly large and increasingly close to each other in the direction in which the strip is moving, this channel being delimited by an outside wall and an inside wall, which is roughly parallel to it. According to one of the main characteristics of the invention, the inside wall is mobile with respect to the outside wall, in the symmetry plane of the channel and in a direction roughly perpendicular to the bottom of the U.
In one particularly simple method of realizing the invention, the inside wall of the U-shaped channel contains an elastically flexible blade, forming the back of the U, this blade being embedded at one of its ends in the inlet to the body, and its other end resting on a mobile abutment within the outside wall of the U.
This abutment is preferably staple-shaped, the back of which is in contact with the flexible blade, the branches of which are parallel to the branches of the outside wall and which possesses a slide-shaped rear part housed in a fixed groove in the guide body.
In order to be able to adjust the position of the abutment with respect to the bottom of the U-shaped outside wall, this slide forms a ratchet that meshes with a toothed wheel carried by the guide body and connected to a drive button.
Just as in known devices, the outlet end of the guide device is beveled to enable the strip to turn back onto these edges slantwise, the front edge of the branches of the outside wall of the U-shaped channel and the front edge of the wings of the staple are inclined on the longitudinal axis of the guide body, and the slide and the groove are parallel to these edges. In this manner, the ridge
REFERENCES:
patent: 2278043 (1942-03-01), Sailer
patent: 2428952 (1947-10-01), Ackerman
patent: 2506325 (1950-05-01), Ackerman
patent: 4744317 (1988-05-01), Cullen et al.
Crowder Clifford D.
Lewis Paul C.
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