US1631956A - Hemmer - Google Patents

Description

June 14, 1927.

. I A. H. DE VQE HEMMER Filed Sept. 20, 1924 INVENTOR Patented June 14, 1927.

UNITED STATES LBERT HARRISON DE von, wEsTFIELD, NEW JERSEY, AssIeNoR TO THE SINGER 1,631,956 PATENT OFFICE) MANUFACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OI .NEW JERSEY.

HEMMER,

Application fl1ed September 20, 1924. Serial no. 738,746.

This invention relatesto sewing machine hem mers and has for an object to provide a hemmer which will evenly and uniformly hem a margin of fabric having an irregular or jagged edge, or ofi'set edge-portions; such as are commonly present at the beginning or end of a previously formed cross-seam. A further object of the invention istoprovide a hemmer into which a fabric edge may be quickly and easily inserted and which will freely receive and turn the edge of the work to be hemmed regardless of cross-seams, serrations, off-sets or other irregularities at the edge of the work.

According to the present improvement the bodyof the'hemmer is made from a piece of sheet-metal bent into the form of a scroll or diminishing spiral. The inner enclosed edge-portion of the scroll is free from the adjacent or main wall portions thereof and its bottom portion 18 cut away at the delivery end of the hemmer. Preferably, the inner portion of the hemmer scroll is in the form of a hollow or concavo-convex forming tongue or arbor disposed forwardly of the exit from the hem-forming passageway; the

free edge of thearbor being in the form of a longitudinally progressing spiral terminating at the delivery end of the hemmer and of a sense opposite to that of the spirally formed hemmer body. In other words, if the hemmer is in the form of a counter-clockwise diminishing spiral terminating in an inner enclosed and free edge, such edge is in the form of a longitudinally and clockwise progressing spiral terminat-' ing at the delivery end of the hemmer. The hemmer includes a work-supporting portion or platform which, together with the hemmer body, has a front edge extending spirally rearwardly toward the delivery end of the hemmer as far as the arbor where it merges into the front edge of the latter and continues spirally in a reverse direction, or forwardly, to the front end of the arbor. By virtue of the foregoing constructive features, the passageway at the delivery end of the hemmer is clear of restrictions to the free and easy egress of the hemmed edgeportion of work, even though the latter varies in bulk due to irregularities such as above described. The spiral front edge of the hemmer and the concavo-convex arbor operate to smoothly turn and fold in any tion. I

irregularities in the edge of the fabric. To

enable the hemmer to handle extreme Ivaria: tions in bulk, such as caused by heavy cross seams, it may be split longitudinally into twosections, one of which ismounted on a spring-pressed arm pivoted forwardly and at one side of the hemmer mouth.

In the accompanying drawings showing the hemmer in operative position. Fig. 2 is a section on the line 2-2, Fig. 1. Fig. 3 is a'rear end elevation of the hemmer. Fig. 4 is a left side elevation of the hemmer. Fig. 5 a bottom plan view of'the hemmer and Fig. 6 is a perspective view of a modified form of hemmer embodying the .inven- In the accompanying drawings 1 repre- Fig. 1 is a plan view-of the bed of a sewing machine sents the throat-plate, 2 the feed-dog, 3 the 1 presser -foot and 1 the needle of an ordinary sewing machine, to the cloth-plate 5 of which is secured the slotted shank 6 of the support 7 for the hemmer body, The sup port 7 is formed with a vertical, fold-guiding flange 8 to the face of which is secured at 9 the fixed scroll-section 10 of the hemmer body. The movable scroll-section 11 of the hemmer. body, which isa continuation of the fixed scroll section 10, is carried by an arm 12 overhanging the fixed scroll-section l0 and constituting a lateral extension of the springpressed arm 13 pivoted at 14 forwardly and at one side of the mouth of the hemmer. The two sections of the hemmer scroll. meet along the line 15 and are held yieldingly in contact with one another along such line by the spring 16, o-neend of which is fixed to the arm 13 adjacent the pivot screw 14 while the other end the vertical flange 8.

The hemmer body is in the form of a scroll or counter-clockwise diminishing spiral as indicated by the longer arrow in Fig. 2. Such diminishing spiral terminates in a hollow or concavo-convex arbor 17 having an inner free edge 18 which is unattached to the adjacent or main wall portions of the scroll. The inner edge 18 is cut away at the delivery bears against 1 end 19 of the hemmer, Fi s. 4 and 5, and

does not obstruct the exit from the hemmer of bulky portions of a hem, such-as caused by double folded portions of an irregular edge or by cross-seams. Preferably the inner free edge 18 of the scrollis in the form in Fig. 2; such spiral terminating at .18 at the delivery end 19 of the hemmer. The hollow arbor 17 is also of longitudinally and clockwise progressing spiral form and is of funnel shape with an open entrance. The body of the hemmer is extended at 20 to form a broad lip or platform for supporting the edge-portion of the work and facilitating its introduction into the hemmer scroll. This lip does not extend to the delivery end of the hemmer but is cut away so as to terminate at the edge 20 which is curved at one end to merge into the main vertical wall of the scroll at its delivery end. Thus the hemmer scroll has substantially no bottom wall at its delivery end, since such walls of both the outer and inner portions of the scroll have been cut away. The front edge 20 of the platform 20 and the front edge 2O of the hemmer body form a continuous spiral extending rear-wardly as far as the point 17 or base ofthe arbor where it merges into the front edge 17 of the arbor and continues spirally in a reversed direction, or forwardly to the front end of the arbor.

It will be seen that the inner or enclosed portion of the hemmer scroll is, in the pres ent instance, in the form of a spiral concavoconvex arbor which extends forwardly from the delivery end of the hemmer and in advance of the forward edge 20* of the upper wall portion. of the hemrner scroll. This arbor, together with the front edge portions 20 and 20 of the. hemmer body and plat form operate to smoothly fold or roll in any irregularities or offsets in, or projections from, the edge of the fabric. The arbor, being in advance of the delivery end of the hemmer, does not obstruct the restricted space at such end and interfere with the exit from the heininer of thickened hem portions caused by such folded-in irregularities. 1n hemming material having heavy cross-seams, the movable section 11 of the hemmer will swing about the screw 14L as a center toward the dotted line position, Fig. 1, sufficiently to permitthe cross seam to pass, whereupon such section will return toits initial position in contact with the fixed section 10.

For the usual run of work the two sections of the hemmer shown in Figs. '1 to 5, inclusive, may be permanently jointed or made in one piece, as shown in Fig. 6, it being unnecessary to splitthe scroll into fixed and movable sections except to handle work having heavy cross-seams or extreme variations in thickness.

Having thus set forth the nature of the invention, what I claim herein is 1. A h'emmer comprising a hem-folding scroll formed as a diminishing spiral terminating in a hollow arbor having an inner free edge extending spirally toward the delivery end of the hemmer, said scroll including a worlesupporting platform disposed mainly in advance of said arbor, said platform and the body of the he1n-folding scroll having a front edge extending spirally rear wardly toward the delivery end of the hemmer and merging into the front edge of said arbor, which latter front edge continues spirally forwardly to the front end of said arbor.

2. The construction set forth in claim 1 wherein the bottom wall of said arbor. and the rear end portion of said platform are cut away approaching the delivery end of said hemmer.

3. A hemmer having a support formed with a fold-guiding flange, a hem-folding scroll divided longitudinally into two sections one which is fixed to said support at one side of said flange, a spring-pressed arm extending in the direction of feed and pivotally mounted at its front end on said support at the other side of said flange and having a lateral extension overhanging said flange, the other of said sections being carried by said lateral extension.

In testimony whereof, I have signed my name to this specification.

ALBERT HARRISON DE VOE.

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