US2356663A

US2356663A - Sewing-machine attachment

Info

Publication number: US2356663A
Application number: US450394A
Authority: US
Inventors: John P Enos
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1942-07-10
Filing date: 1942-07-10
Publication date: 1944-08-22
Anticipated expiration: 1961-08-22

Description

Aug. 22, 1944. J; P. ENOS SEWING MACHINE- ATTACHMENT Filed July 10, 1942 4 v 3mm cfOhflRKnos J Patented Aug. 22. 1

p f 3mm g 'S-EW'ING-MAGHINE ATTACHMENT. John P. Enos UnionIN. .L, assignor to The Singer Manufacturing Comp any, Elizabeth, N. .L, a

*corporation of New Jersey V W '7 Application July 10,1942, Serial No. 450,394

3 Claims. (01. 112-143) This invention relates to sewing machinede vices which are adapted tofacilitatethe production of felled seams.

To produce the usual-type of felled seamf in which two plies of material are involved, it is the usual practice to first superpose the edge portions of the two pieces of work and stitch them together a suitable distance from the edges of the work. Thesecond and final operation is accomplished by opening the seam and inserting the free edges of the work in a regular presserfoot hemmer, therebyto complete the fell which is seamed by means of stitches passing through five plies of the work. g My U. S. Patent No. 2,296,509, datedSept. 22,

1942, discloses a presser-foot hemmerof the type above referred to.

:However, when it is attempted to secure two heavy or stiff pieces of work together by means of the above described felled seam, or to secure an edge portion of a;single ply of material to the edge portions of two superposed plies of material by the same method, difiiculty is experi-v enced in properly loading the plies of fabric into the usual hemmer-foot. This diificulty arises because, in either of the two above cited cases, the plies are too stifi or heavy to bend readily about the hemmer-arbor- Therefore, if the various plies do not properly bend about thehemmerarbor, the work cannot enterthe required distance into the hemmer and consequently adefective seam will result. It is to obviate this diiiiculty that the present devices have been provided. V

The present invention, therefore, has for an object to provide improved devices that will facilitate the proper formation of a felled seam, particularly when the work to be seamed comprises more than two plies or is composed of stiff and heavy materials.

The invention both in structure and in operation, as well as additional objects thereof, will be best understood from the following description taken in conjunction with the accompanying drawing, in which:

Fig. 1 is a perspective view of a hemmer-foot used in conjunction with the present invention as applied to a sewing machine.

Fig. 2 is a top-plan view of the hemmer-foot and the throat-plate embodying the invention.

Fig. 3 is a front view of the throat-plate shown in Fig. 2 and illustrating the action of the invention.

Fig. 4 is a section of the throat-plate taken substantially along line 44 of Fig. 2.

p on the sewing machine throat-plate l4.

Fig. 5 is a fragmentary bottom plan view of the throat-plate embodying the present invention. g

Fig. 6 is a section of a piece of work taken transversely of the line of'seam formation.

-In the drawing, the hemmer, foot'is shown'as comprising a base-member or sole-plate Ill terminating in a shank ll attached by the thumb,-

screw l2 to the usual presser-bar l3 of a sew-j ing machine having a throat-plate l4 and a reciprocatory needle-bar l 5 carrying the threaded needle l5. The sole-plate Ill atits forward end is bifurcated to provide the spaced toes l6 and I! and is apertured, as at 18, to provide the usual needle-hole.

Carried by the toe I1 is the usual hemmer scroll l9 having a leading work-folding edge 20 which extends spirally rearwardly between the toes l6 and I! toward the needle-hole IS. The work-folding edge 20 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.

. Carried by thetoe I 6 is a shank-2| having -a conical-shaped arbor 22, the free end of which is disposed within the scroll l9 and directed toward the needle-hole 18. From Fig. 1 it will be seen that the marginal portion of the fabric is folded about the conical-shaped arbor 22 by the hemmer scroll I9. The arbor 22 and the sidewall l'l' of the toe ll form a cloth passageway through which the work is loaded into the hemmer-foot. v It is understood that the fabric is fed under the hemmer-foot by the usual feeding element or dog (not shown) common to sewing machines. The above described hemmer-foot is adapted to operate in its usual manner but, according to the present invention, it is supplemented by a loading fin of spring wire resiliently supported The throat-plate is of the usual type with the exception that it is provided with a narrow slot 23 disposed longitudinally of the direction of seam formation and in front of the hemmer-foot so as to be aligned with the fabric entrance thereof. The forward end 24 of the resilient wire is secured, by means of a screw 25, in a groove 26 formed in the bottom face of the throat-plate Id. The wire extends from this mooring upwardly through the slot 23 to form a workengaging portion or fin 21 which is inclined upwardly toward the entrance of the hemmerfoot; As may be best seen in Fig. 2, this Workengaging portion of the wire is disposed substantially parallel to the line of seam formation, and further, it is located to one side of the needle-hole l8, and is aligned with and extends into the cloth passageway as defined by the sidewall I1 and the arbor 22. The free end of the wire then extends downwardly through the slot 23 and is bent at right angles to the fin 21, thereby to form an arm 28. The screw 25 is preferably set upon the wire portion 24 so that the fin 2! is spring biased upwardly away from the upper surface of the throat-plate and so that the arm in order to prevent the free end of the wire from being raised above the throat-plate l4.

This throat-plate I4 is provided with the sun feed-dog slots 29 and a needle-hole 39 which is aligned with the hemmer-foot needle-hole I8."

7 tially' finished seam and force the upwardly pro jecting free edges 3| of the upperside of the work 32 into the hemmer-foot, thereby to cause the heavy three plies of material to enter the hemmer-foot the proper distance so as to insure that a perfect fell willlbe formed. As the fin 27 is resilient it will adapt itself for materials of different thicknesses.

Furthermore, the operator may control; with the aid of the present invention, the amount of material which is fed into the hemmer-foot. The operator need only place one hand upon each side of the work adjacent to the upwardly projecting free edges 3|, and then by a spreading action of the hands downwardly and in opposite sidewise directions the free edges 3| are forced downwardly againstthe resilient fin 21 to a greater or less degree, thereby to limit the amount of material which the fin Z'I-may crowd into the hemmer-foot. It is particularly advantageous to be thus able to control the amount ofmaterial which may be fed into the hemmer-foot when the thickness of the work or the number of plies of the work varies during a single continuous seaming operation.

It is to be understood that the fin- 21 may be adjusted transversely of the line of seam formation by loosening the screw 25 and shifting the wire portion 24 lengthwise within the slot 26. Furthermore, by turning the wire portion 24 herein illustrated is constructed of piano wire 'having a diameter of .025 inch. This fin was 28 will engage the bottom of the throat-plate. l4 .e;

found to be particularly well adapted, for use with silk and rayon materials. I-Iaving this set forth the nature of the invention, what I claim herein is:

s 1. A sewing machine throat-plate having a one end is secured to the bottom surface of said throat-plate, said wire having its body portion extending upwardly through .said slot and normally disposed above the top surface of said throat-plate, the other end of said wire extending downwardly through said slot and being bent at an angle to said body portion to underlie said throat-plate. and means to adjustably secure said-wire to said throat-plate so that the wire may be adjusted transversely of said slot;

2. The combination with a hemming device having a needle hole, an arbor and a side-wall, said arbor and said side wall forming thereb'etween a cloth passageway, of a cloth-plate opposed to said hemming device, a member carried by said cloth-plate and having a portion thereof spring biased toward said hemming device'said member being aligned with said passageway and being effective to engage a portion of a cloth piece and force the same into said passageway to insure that a complete hem is 'made in said cloth piece, and means to adjust said member transversely of said passageway.

3. The combination with a hemming device having a sole-plate formed with spaced toes, a hemmer scroll carried by a first one of said toes, and a hemmer arbor carried by the second one of said toes, said hemmer arbor and said first toe forming therebetween a passageway, of a throatplate opposed to said her'n'm'ing device, and a fin carried bysaid throat-plate and aligned with said passageway, said fin being adapted to engage-a portion of the work and to force the same into said passageway. a i I V I 7 JOHN P. ENOS.