US1536385A - Sewing machine for forming concealed stitches - Google Patents

Description

May 5, 1925.

J. J. HEAP SEWING MACHINE FOR FORMING CONCEALED STITCHES Filed Sept.124, 1919 4 Sheets-Sheet 1 May 5, 1925.

Filed Sept. 24, 1919 4 Sheets- Sheet 2 May 5, 1925.

J. ,1. HEAP SEWING MACHINE FORFORMING CONCEALED STITCHI SS Filed Sept. 2 1, 19l9- 4 Sheets-Sheet 5 May 5, 1925. 1,536,385

J. J. HEAP SEWING MACHINE FOR FORMING CONCEALED STITCHES 4 Sheets-Sheet 4 Filerfsept. 24, 1919 Patented May 5, 1925.

UNITED STATES 1,536,385 PATENT OFFICE.

JESSE J. HEAP, OF NEW YORK, .N'. Y., ASSIG-NOLB TO UNION SPECIAL COM.-

PANY, OF CHICAGO, ILLINOIS, A CORPORATION ILLINOIS.

SEWING MACHINE FOR FORMING CONCEALED STITCHES.

Application filed September 24, 1919. Serial No. 325,827.

To all whom it may concern:

Be it known that 1, Jesse J. HEAP, a citizen of the United States, residing at New York city, in the county of New York, State of New York, have invented certain .new and useful Improvements in Sewing Machines for Forming Concealed Stitches, of which the following is'a description,'reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in sewing machines, and more particularly to a sewing machine for forming concealed stitchesthat is, a line of stitches wherein the needle thread is located beneath a portion of the strip as viewed from the right or face side thereof, so that'said portion conceals the stitches from view.

.An object of the invention is to provide a machine of the above type which is especially adapted for stitching short lengths of fabric, for forming belt loops, coat hanger loops, or the like.

A further object of the invention is to provide amachine of the above type, with a feeding mechanism operating to feed the strip toward the front of the machine or toward the operator, and also means for directing the strip to the needles, so that the part which'is to be penetrated by the needles only crosses the oath of the needles.

These and other objects will in part be obvious and will in'part be hereinafter more fully disclosed.

' In the drawings which show by Way of illustration one embodiment of the invention- Figure 1 is afront view of a portion of the machine embodying my improvements Figure 2 is an end view of the same with parts-" brjoken away to show the feeding mechanism beneath the work support;

Figure 3 is a plan View of the work support with the cover plate drawn back to expose to view the looper;

Figure 4 is a perspective view of the resser foot and the needles-showing in dotted lines the fabric strip as it is guided to and from the needles;

Figure 5 is a sectional view longitudinally-through the presser foot;

Figure .6 -is a perspective view showing more or less diagrammatically the needles strip to the needles,

and strip and the path of movement of the strip through the machine;

Figure 7 is a sectional view showing more or less diagrammatically the strip, the needle and the feed, with the needle penetrating the inturned edge of the strip;

Figure 8 is a bottom plan view of the strip after it has been stitched to form the belt loop or the coat hanger loop;

Figure 9 is a bottom plan view of the presser foot;

Figure 10 is a top presser foot with the strip attached thereto.

In the Higgins Patent No. 1,195,814, August 22, 1916, there is shown and described a machine for forming concealed guide for the fabric stitching, wherein the needles which secure the, strip to a body fabric ass through the inturned edges respective Y of the strip only, thus laying the needle threads between the inturned edges and the body portion of the strip being stitched so that said threads are concealed from the right or face side of the strip. In said patent the plan view of the strip is led to the needles from a point in rear ofv the needles and is then fed toward the rear of the machine. This makes a very inconvenient way of directing the lengths of fabric are used.

My present invention is directed, to an improvement upon the machine shown in the said providing of a feed dog which is so constructed and timed as to feed the strip which is being stitched toward the front side of the machine-that is, toward the operator, and in the providing of a guide for the strip which is so disposed that the strip may be led to theneedles from a point in front of the needle bar; said stri bein folded about the path of the 'needlbs an then deflected as it passes beneath the presser foot, so as to cause the inturned edges of the strip to be penetrated by the needles. b

Referring more in detail to the drawin s, I have shown the invention as embodied in a sewing machine having a work support 1 carried by the bed plate of the machine, which is indicated at 2. Also, mounted on this bed plate is an overhanging arm 3, in which a needle bar 4 is mounted to reciprocate. Said needle bar, as herein shown, is

especially when short."

patent and resides broadly in the too provided with two needles 5 and 6. The

needle bar is reciprocated by a needle lever 7, which is connected by a link 8 to a lug 9 fixed to the needle bar. The material is fed along the work support by means of a feed dog 10. Said feed dog 10 is carried by the bridging supporting member 11- 11, which are formed as a part of the shank 12 of the feed dog. Said shank 12 of the feeddog is secured to a feed bar 13. This feed bar is pivoted at 14 to a feed rocker which is moved back and forth by an arm connected in the usual way to acrank on the forward end of the main shaft. The feed bar is raised and lowered by an eccentric 16 mounted on the main shaft 18. As the feed rocker oscillates the feed dog is moved back and forth. The lifting eccentric for the feed bar is timed so as to raise the feed dog into engagement with the material on its stroke toward the forward side of the machinethat is, toward the operator and the teeth of the feed dog are pointed in a direction toward the operator, so that the fabric is gripped by the feed dog and moved a stitch ength in a direction toward the front of the machinethat-.is, toward the operator who sits at thefront of the machine.

The material is held on the work support by means of a presser foot 19 carried by a gresser bar 20, of the usual construction.

aid presser foot is formed with an opening 21 therein. Directl 1 above this opening in the presser foot an carried by the presser foot is a strip guide 22. Said strip guide is formed with a shank'23 which is secured to the presser foot by means of screws 24-24. The strip guide 22 encircles the path of the needles and is provided at the rear with a projecting rib 25 which is substantially T- shape in cross section. The strip of fabric being stitched is indicated at S in the drawings. Said strip of fabric is led to the needles in rear of a uiding wire 26 and thence into the strip guide 22. The edges of the strip S, which are inturned, are indicated at s and 8. Said edges are carried around the respective needles 5 and 6 to a point in rear thereof and are guided and directed by the T-shaped rib 23. The body portion of the strip is in front of the needles, as clearly shown in the drawings. Said guide is more or less tapered so as to receive the strip and i'nturn the edges, in the manner shown in the drawings. .As above noted, the inturned edges of the strip are in rear of the needles. As the strip reaches the lower surface of the presser foot, it is directed forwardly into the recess 27, said recess being of substantially the width of the finished belt loop or coat han er loop which is being formed. The feed 0g operates upon the strip under the forward portion 23 of the presser foot and feeds the strip, as stated above, toward the front side of the machine. The turned in portions .9 and s. of the strip, as the strip is led toward the front of the machine, will be caused to cross the respective paths of the needles 5 and 6, and the needles will, therefore, penetrate these inturned edges. The body portion of the strip, however, passes down in front of the needles and does not cross the path of the needles, and, therefore, will not be penetrated by said needles. The needle threads are indicated at n and n in the drawings.

Said needle threads will be deposited on the inner faces of the inturned portions .9 and s, respectively. and beneath the body portion of the strip S, so that said body portion of the strip conceals these needle threads. The loops formed in the needle threads will be carried by the needles through the respective inturned edges.

Co-operating with the needles beneath the work support is a threaded looper 28, which is of the usual character. Said looper cnters both needle thread loops and deposits a looper thread loop, indicated at Z, in said needle loops. The looper thread Z joining the needle loops, covers the edges of the inturned portions 8 and s, and thus the strip has its edges inturned and stitched together, so that the strip will be held in folded condition and at the same time the stitches for joining these edges entirely concealed from the front face of the strip. Such a strip, as above noted, is particularly useful for forming belt loops, coat hanger loops and the like. The looper 28, of course, enters the needle loops on th front side of the needles and moves to the rear of the needles for its needle avoiding movement.

The throat plate 29 of the sewing machine is formed with needle openings 30-.-30 for the needles, and a stitch tongue 31 projects forwardly from these needle openings, so that the looper thread loops will be shed from the stitch tongue by the feed of the strip toward the front of the machine.

From the above, it will be apparent that very short lengths of fabric may be readily directed in rear of the wire 26 and into the strip guide 22. These short lengths of fabric will have their edges inturned and the fabric strip will be fed toward the front of the machine, so that the needles forming the concealed stitches will unite the inturned edges of the strip. This enables the belt loops or coat hanger loops to be made from scrap material which is cut into short lengths and one after another fed to the machine.

Itis obvious that from certain aspects of the invention the strip may be folded and fed toward the front of the machine, as de scribed, and stitched to a body fabric, but

the invention is particularly adapted to the forming of belt loops and coat hanger loops and the like, wherein the strip itself after being stitched forms the completed article.

While I have shown the invention as applied to a machine havinv two needles, it is also obvious that a single needle may be used, which is'vibrated' back and forth, or

the edges may be slightly overlapped and a single needle used which penetrates both edges. It will be understood, therefore, that the invention is not directed to any specific form of stitching mechanism or any specific form of guiding means, or any specific form of feeding mechanism, but rather to a combination of elements whereby the function stated may be accomplished.

' Having thus described my invention. what I claim as new and desired to. secure by Letters Patent, is:

The combination of a work support, stitch forming mechanism including a plurality of needles, and devices cooperating therewith for forming connected lines of stitching, a feeding mechanism including a feed dog disposed and operated so as to feed the material being stitched toward the front of the machine,-a presser foot cooperating with the feeding mechanism, and guiding means carried by the presser foot and adapted to receive short strips of fabric inserted in the guiding means in front of the needles, for

'folding re arwardly the side edge portions of said strip and for directing said side edge portions' of the strip to the rear of the needles whereby the strip is fed forwardly from underneath the presser foot, and the stitch forming mechanism operates to connect the side portions by connected lines of stitching.

In testimony whereof, I aiiix my signa ture, in the presence of two witnesses.

JESSE .l'. HEMP. Witnesses: OBED J. OLSEN, Amman J. WAREING.

Images