US2296509A - Sewing machine hemmer - Google Patents

Description

Sept. 22, 1942. J. P. ENOS SEWING MACHINE HEMMER Filed Oct. 29, 1940 (hit n I? Enos Patented Sept. 22, 1942 UNITED STATES PATE'i OFFICE Singer Manufacturing Company,

Elizabeth,

N. J., a corporation of New Jersey Application October 29, 1940, Serial No. 363,266

4 Claims.

This invention relates to sewing machine hemmers particularly of the presser-foot type. In the use of hemmers of this type the fabric being hemmed has its marginal edge folded by a scrollmember into substantially a tube about'a'n' arbormember and when so folded is delivered beneath the sole-plate of the presser-foot where the tube is flattened and then stitched in such flattened condition. In order to maintain proper control of that portion of the fabric folded into the tube it is necessary that the fabric-passageway between the arbor and the scroll throughout its length be only slightly more than the thickness of the fabric being hemmed. In hemmers as heretofore constructed it is common to form the arbor-member from a section of wire having a uniform cross-sectional area. With this type of arbor the fabric-passageway between the arbor and the scroll varies in size or capacity from oversize at the receiving end of the hemmer to proper size at the delivery end of the hemmer. This variation in the size of the fabric-passageway effects the accurate control of the fabric during the folding thereof. Furthermore, the arbor cross-sectional size is so small that the folded fabric is not maintained in its proper tubular formation, but is permitted to collapse prematurely before it passes the delivery end of the hemmer, which premature collapsing frequently results in the uncurling of the raw edge of the fabric, producing imperfections in the finished Work.

The present invention has for its primary object the provision of an arbor-member of such size and shape as to properly control the fabric comprising the hem-fold and prevent its premature collapse in its passage through the hemmer.

Another object of the invention is to provide a hemmer having an arbor-member designed to properly control the fabric in the hem-fold, the arbor-member being simple in construction and susceptible of mass production on a so-called automatic screw-machine.

A still further object of the invention is the provision of an improved arbor-member for a hemming attachment which, in its operative relation with the fabric-turning scroll, does not impede the introduction of the work into the hemmer, but provides a smooth unbroken workdirecting surface facilitating the proper introduction of the work between the arbor and the scroll.

Other and further important objects of this invention will be apparent from the disclosure in the specification and the accompanying draws ing, in which:

Fig. 1 is a perspective view of a hemmer-foot embodying the invention and shown as applied to a sewing machine.

Fig. 2 is a top plan view of the foot.

Fig. 3 is a bottom plan view of the foot.

Fig. 4 is an enlarged plan View of the arbor member as it is produced on a screw-machine and before the shank thereof has been properly bent.

Fig. 5 is a sectional view taken substantially along the line 55, Fig. 2.

In the drawing the hemmer foot is shown as comprising a base-member or sole-plate I terminating in a shank 2 attached by the thumbscrew 3 to the usual presser-bar 4 of a sewing machine having a throat-plate 5 and reciprocatory needle-bar 6 carrying the threaded needle I. The sole-plate I at its forward end is bifurcated to provide the spaced toes 8 and 9, and is apertured, as at III, to provide the usual needlehole.

Soldered or otherwise fastened to the toe 9 is the usual hemmer scroll II having a leading work-folding edge I2 which extends spirally rearwardly between the toes 8 and 9 toward the needle-hole Ill. The work-folding edge I2 is preferably steeply spiraled so that it will have a decided folding action on the marginal portion of the fabric as the same contacts the work-folding edge in its passage through the hemmer.

Preferably formed endwise of the toe 8 is a hole I3, shown in dotted lines in Fig. 2, adapted to receive the attenuated shakn I4 of a conicalshaped arbor I5, the free end of which is disposed within the scroll II and directed toward the needle-hole Iii. It will be observed that the conical-shaped arbor I5 is spaced a uniform distance from the scroll II for the full length of its projection within the scroll thereby defining a fabric-passageway of uniform capacity. Also, from Fig. 1 it will be seen that the marginal portion of the fabric is folded about the conicalsha-ped arbor I5 by the hemmer scroll I I and that the arbor is sufiiciently large in cross-section at any one point within its work-controlling length as to fill the tubular fold of fabric formed by the hemmer. It is desirable that the fabric-passageway be of uniform capacity and th arbor be of such cross-section as to completely fill the hemfold, for when the hemmer is so constructed the fabric Comprising the hem-fold is better controlled in its passage to the needle, and is not permitted to unfold prior to being stitched.

As previously indicated one of the advantages of the present invention is that an arbor-member is used which is susceptible of convenient production on a so-called screw-machine. This can be better appreciated by reference to Fig. 4. In this figure there is illustrated the preferred form of arbor-member which comprises a workcontrolling conical head I5 tapering toward its free end and at its other end formed with a reversely conical portion I6 terminating into the attenuated shank I4. In preparing the arbormember for assembly on the hemmer, the shank I4 is properly bent adjacent the reversely conical portion I6 into substantially U-shape. After the arbor-member is properly bent the end of the shank I4 is inserted into the hole I3 in the toe 8 and soldered or otherwise suitably fastened therein. It will be seen in Figs. 2 and 3 that, after the arbor-member is properly bent, the reversely conical portion I6 forms with the curved outer surface of the shank I4 a smooth work-directing surface I! which is devoid of any ledge-like protuberances likely to impede the introduction of the fabric into the hemmer.

It is understood that the fabric is fed under d the hemmer-foot by the usual feeding element (not shown) common to sewing machines.

Having thus set forth the nature of the invention what I claim herein is:

1. A sewing machine hemmer including a basemember, a work-folding scroll secured to said base-member, and an arbor-member also secured to said base-member and disposed in cooperative relation with said scroll, said arbor-member comprising a conical work-controlling head formed with a reversely conical portion terminating in a curved shank fixed to said base-member.

scroll carried by one of said toes and having a spiralled leading edge, and an arbor-member oomplemental to said scroll and carried by the other of said toes, said arbor-member including a conical work-controlling head tapering toward its free end and formed at its other end with a reversely conical portion terminating in a shank which is bent into substantially U-shape adjacent said reversely conical portion.

4. A sewing machine hemmer foot having a sole-plate provided with a needle-aperture and at its forward end with spaced toes, a hemmer scroll attached at its forward end to one of said toes and having a spirally formed leading edge extending rearwardly in the space between said toes toward said needle-aperture, and a hemmer arbor complemental to said scroll, said arbor including a conical work-controlling head tapering toward the needle-aperture at its rearward end and formed at its forward end with a reversely conical portion terminating in a shank bent into substantially U-shape and anchored to the other toe of said sole-plate.

JOHN P. ENOS.

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