US1943801A - Hemmer - Google Patents

Description

Jan. 16, 1934.

c. w. MUELLER 1,943,801

HEMMER Filed May 5. 1932 Patented Jan. 16, 1934 UNITE TT QFFCE HEMD/IER Application May 6, 1932. Serial No. 609,719

3 Claims.

The invention relates generally to hemmers of the type employed for mechanically folding or turning a hem in advance `of the sewing operation 'employed for securing the thus formed hem, and 5 primarily has for its object to provide a novel hemmer structure which is capable of turning a narrow hem and yet embodies a peculiar quality of resilience permitting efcient operation despite nuctuations in material thickness and the passage therethrough of cross-seams.

Considerable difficulty is occasioned at times in mechanically turning hems due to the fluctuations or variations in the thickness of the material being Worked upon and the necessity of passing cross-seams through the hemmer. The tendency thus occasioned to choke and clog the hemmer increases as the size of the hem desired decreases and it is almost impossible practically to turn a hem as small as is oftentimes desirable.

' Therefore, in its detailed nature, the invention seeks to provide a simple hemmer construction of the conical scroll type wherein the scroll nose or outlet is made small enough to produce the desired narrow hem and is longitudinally slitted to provide for the yield or resiliency necessary to accommodate variations in material thickness and permit passage of cross-seams.

The invention further resides in the provision of novel auxiliary spring means for reinforcing the resilient segments produced by provision of the longitudinal slits.

The invention still further resides in the novel details of construction, combination and arrangement of parts, all of which will be first `fully described in the following detailed description, then be particularly pointed out in the appended claims, reference being had to the accompanying drawing, in whichz- 40 Figure 1 is a plan View illustrating the invention, a piece of cloth including a cross-seam being shown passing therethrough.

Figure 2 is a front elevation.

Figure 3 is a side elevation.

Figure 4 is a rear elevation.

Figure 5 is a cross section taken on the line 5-5 on Figure 1.

Figure 6 is an enlarged somewhat diagrammatic cross section of a hemmer turned hem.

Like reference numerals designate corresponding parts throughout the several gures or the drawing.

My improved hemmer includes an attaching plate 5 to which is secured the attaching arm 6 which extends laterally from the plate and is (Cl. i12-141) equipped with apertures '7 to facilitate attachment thereof to the sewing machine.

The plate 5 is curled or bent at one edge to form an edge-turning coniform scroll 8 having an entrant mouth or inlet 9 and a restricted nose or outlet 10. Within the scroll a frusto-coniform core 11 is secured and an overhanging guide ange 3.2 extends laterally from the core and scroll in spaced relation above the plate 5, as indicated at 13, so as to permit free passage of the material.

t will be noted that except for the degree of v resiction of the outlet nose, the hemmer described above is oi more or less conventional form. In the use of hemmers of this type considerable diiculty has been occasioned when; 170 attempting to adapt such hemmers for turning very small or narrow hems. Hereto-iore, when the outlet nose was restricted sufliciently to produce the desired narrow hem, such restricted nose was too rigid to permit passage of cross-seams175 with the result that such hemmers were found to be impractical because of frequent clogging. It has been found that even variations in the thickness of the material were suflicient to clog the outlet nose. zy- 80 In my improved hemmer the outlet nose is slitted longitudinally as indicated at 14, the provision of the plurality of slits providing intervening resilient segments. The slits 14 extend from a point adjacent the rear terminus of the core 11'-l85 rearwardly through the outlet end 10 of the scroll, thus providing the resiliency where the tendency to clog experienced the most. In this manner I nd it entirely practical to constrict the outlet nose sufficiently to produce a hem as small orH narrow as may be desired, the resilient segments being capable of yielding during passage of crossseams and also for properly accommodating variations in material thickness.

In order to avoid distention of the segmentsN beyond their limit or" resiliency, I provide auxiliary springs 15 which are attached as at 16 to the solid end of the scroll as indicated in Figures 1 and 3 and overlie the resilient segments so as to 100 reinforce them and prevent permanent distortion or" the outlet nose. The point of attachment of the spring ngers 15 is adjacent the terminus of the core i1, the remainder of the length of the lingers extending to the outlet end 10 and over-,105 lying and contacting the resilient segments intervening the slits 14, being free to yield with and reinforce said segments. It will be observed that by providing individual auxiliary springs they may be made separately from the hemmer proper 110 and tempered to a degree assuring perfect functioning in their segment reinforcing capacity.

The operation of the hemrner will be Well understood by those skilled in the art to which it relates. The material generally designated 1'? being passed through the hemmer, as indicated in Figure 1 of the drawing, will be turned by the scroll to form the desired narrow hem indicated at 18 after which it will be secured in the usual manner by stitching diagrammatically indicated at 19. The material 17 is shown as including a cross-seam 20 which may pass through the hemmer without in any manner injuring the same or interfering with the formation of the desired hem.

It is of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:-

1. A hemzner including a coniform edge turning scroll having an entrant mouth and a re stricted outlet nose, said nose being slitted to provide resilient segments capable of yielding to permit passage of cross-seams, and auxiliary spring means secured to said scroll and overlying and reinforcing said segments.

2. A hemmer including a coniform edge turning scroll having an entrant mouth and a restricted outlet nose, said nose being provided with a plurality of spaced longitudinal slits providing intervening resilient segments capable of yielding to permit passage of cross-seams, and auxiliary spring means secured to said scroll and overlying and reinforcing said segments.

3. A hemmer including a coniform edge turning scroll having an entrant mouth, a restricted outlet nose, and an enclosed core terminating short of the end of said outlet nose, said nose being slitted from its outlet end to a point adjacent the terminus of the core to provide resilient segments capable of yielding to permit passage of cross-seams, and spring fingers secured to the scroll adjacent the terminus of the core and contacting the resilient segments to reinforce the same.

CHARLES W. MUELLER.

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