US1825454A - Overedging sewing machine - Google Patents

Description

p 1931. E. HAUSSLER 1,825,454

OVEREDGING SEWING MACHINE Filed June 26, 1929 3 Sheets-Sheet 1 Sept. 29 1931. E. HAussLER OVEREDGING SEWING MACHINE Filed June 26, 1929 3 Sheets-Sheet 2 m n W a Sept. 29, 1931. AU 1,825,454

OVEREDGING SEWING MACHINE Filed June 26, 1929 3 Sheets-Sheet 3 dm s Patented Sept. 29, 1931 UFNI'TIED fs'rA LdZSAlElA nnnsr HKUssLEa,

ENFABRIK, G..M. B. .11., OF STUTTGART, GERMANY ovnnnnerne SEWINGMACHINE Application filed .Tune"26, 1929, Serial No.

The invention relates to new and useful improvements in an o-veredging sewing machine for formingedge covering stitches :in a fabric section.

An object. of the invention is to provide an overedge stitching mechanism "with a means which isadapted toengage the looper thread for drawing said thread tautsoas to lay loops the needle thread at the upper and lower facesof thefabric sect-Ton which extendt-o the edge of 'the fabric and are secured by the looper athread.

In the drawings a Fig. 1 is a 'viewin plan showing more or .15 less diagrammatically the essential. features of an overedge stitching' mechanism with the improvedtake ap which engages thenlooper thread between successive :StltChGS for drawing the same taut.

:20 vFig.Qisa ieW partly insectionand partly in side elevation showing the .feedbar', the feed dog, the :meansa-for operating the feed .dogand themannerof.supporting the looper thread take-upon the feed bar.

t ,Fig. 3 .is' a perspective view showing the .needle ,.the. loopers, the stitch finger and the rlooperthread take-up; the =presser foot .is shown moved \out of position to expose the .parts beneath .the .same.

" Fig. i4: is a diagrammatic View onan en:

.larged .scaleshowin-g a dabrieseetion having 7 the o eredgi-ng stitches applied thereto .by

any improyed overedgingmechanism. F Fig-5 is .a view partly in plan and partly in section showing diagrammatically the :neesdleathesthread carryingthelooper, the amtiliarylooper, the feed anemia the looper thread,;.take.up. I p

. The "invention is directed to an oVeredge stitching mechanism. which includes aneedle .a thread carrying looper cooperating with .the needle [beneath the fabric and forming .a lloopy-which .is ;:passed through the. needle thread-loop. Also cooperating with :the loop- ("or .and ..needle .isan auxiliary loop carrying im plement which engages the looper thread and forms a loop therein for the needle-to enter-onits nextldescent. This loop carrying im plement is so mounted .as to move me 5 direction rearwardly l-ast well ;as.transversely 373,754, and in Germany July '11, 1928. i

or STUTTGARTQGERMANY, ASSIGNOR 'ro UNION srncmii MASGHIN of;the line of. feed during the feeding of the fabric. ,Associated with these overedge stitch forming elements is alooper thread take-up which .is mounted on the feed baran'd moves with the feed bar. This looper thread takeup engages the looper thread'between successive stitches and draws onthe thread soas to practically pull the looper thread straight. Inasmuch .as the needle thread loop is passed throughthe looper thread loop this will draw theneedle thread above the fabric to the edge of the fabric so'that the needle threadbetween successivestitches is laid substantially into loop form. i

Referring to Fig. 4 ofthe drawings, the fabric being stitched is: indicated at 31; the needle punctures at .30., The needlethread is indicated at n. 1. This needle thread is formed into aloop which is passed through the fabric and the looper thread? is passed in loop form through the needle thread loop. This needle thread loop is indicated at a in Fig. 4. The movement of the loop into the needle thread loop draws this needle thread loop which is beneath the fabric well out to the edge of the fabric. The looper. thread which is formed into a loop isicarried over the fabric .so that the needleenters the loop on its next descent. .The looper thread, as clearly shown inFig. 4,.is drawntaut and as a result the :loop is. taken out of the looper thread and this will pull theneedle thread which passed. in loop form through the looper thread loop tothe edgeof the .fabricythus forminga loop in the-needle thread between L successive stitches. n :in the drawings. i y

TRefe-rring more in detail to the mechanism for accomplishing this result, the machine is shown as provided with a needle 29 through This loop is indicated at which aneedlethread nis passed. It is also provided with alooper 1 which carries the looper 1- is mounted on a looper carrier QWlliCll is attached to a collar 3 in turn mounted on ashaft 4. The shaft l carries a'slee-ve which is fixed thereto and this. sleeve -is provided with an arm 6 attached to a link 5; The link 5 is given an endwise movement whiclrimgparts an oscillation to thelooper, 1. This thread 7. This thread carrying looper causes the looper 1 to move into and out of the needle thread loop.

Cooperating with this looper is a loop carrying implement 9. The loop carrying implement 9 is mounted on a carrier 10 fixed to the collar hi which in turn is attached to the upwardly inclined shaft 12. The shaft 12 is provided with a sleeve carrying an arm 14 to which a link 13 is connected. As the link 13 is reciprocated. the loop carrying implement 9 will be oscillated and moved so as to engage the looper thread 7 and carry the looper thread in loop form over the fabric, positioning the same for the needle to enter 011 its next descent.

The loop carrying implement 9 is provided with a notch 15 which engages the looper thread and carries it over the fabric in loop form. The material is fed across the work support by a feed dog 22 mounted on a feed bar 21 which is connected to a feed rocker 20. The feed rocker 20 is provided with an arm 19. and an eccentric strap 18 connected to said arm cooperates with an eccentric 17 on the main shaft 16. The feed bar is raised and lowered by an eccentric 23 on the main shaft 16. Also mounted on the feed bar is a bracket 25. Said bracket is secured to the feed bar 21 by a screw 26 passing through a slot 27 in the bracket. This bracket is provided with the usual needle guard 28. This needle guard is so positioned that when the needle passes down through the fabric it will engage the rear face of the needle if it is deflected and insure that it is properly positioned so that the looper will pass in rear of the needle and not strike the same.

Also mounted on this bracket 25 is the improved looper thread take-up 24c. Associated with the stitching mechanism is a stitch finger 33 carried by a combined sup.- porting bracket and edge guide 32 which guides the edge of the fabric section 31 as it is directed to the stitching mechanism. As the stitches are formed they are formed about this stitch finger 33 and are then fed oil from the end thereof.

From the above it is believed that the operation of the machine will be obvious; the needle passes through the fabric throwing out its usual loop which is entered by the thread carrying looper. The loop carrying implement engages the looper thread and forms a loop therein which is carried over the edge of the fabric and positioned for the needle to enter. As theneedle is passing down into the fabric the feed dog is moving toward the front of the machine preparatory to engaging the fabric for feeding the fabric a stitch length when the needle is out of the fabric. On this forward movement of the feed bar the looper thread take-up engages the looper thread. between the previously formed stitch and the concatenation of thread loops which have just been formed and which are being drawn up as the needle descends. This pulls the looper thread taut taking out of the looper thread the loops which are formed therein. This straightening of the looper thread will pull the needle thread strands passing therethrough to the edge of the fabric section. This forms in the needle thread practically a loop located between successive needle punctures, which loop extends all the way to the edge of the fabric section. The looper thread is straight and is interwoven with the needle thread loop passing through the needle puncture and the loop in the needle thread between successive needle punctures.

lVhile I have shown the take-up as mounted on the feed bar and movable therewith, it will be understood that this takeup may be otherwise formed and operated. The essential feature consists in the engagement of the looper thread so as to draw the same taut and thus produce needle thread loops on the upper and lower faces of the fabric section which are united at the edge of the fabric section. There is an advantage, however, in the mounting of the finger on the feed bar for the reason that when the length of the feed stroke is varied, the pull of the finger on the looper thread will likewise be varied so as tomaintain its proper action on the looper-thread.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is z I 1. An overedging sewing machine including in combination a thread carrying needle, a thread carrying looper adapted to enter the needle thread loop, a loop carrying implement adapted to engage the looper thread and form a loop therein and position the same for the needle to enter. and means for engaging the looper thread between the looper and the previously formed stitch for drawing on said looper thread during the setting of the stitches so as to lay said looper thread substantially straight at the edge of the fabric section. thus forming loops in the needle thread on the upper and lower faces of the fabricwhich extend to the edge of the fabric I section.

2. Any overedging sewing machine including in combination a thread carrying needle, a thread carrying looper adapted to enter the needle thread loop. a loop carrying implement adapted to engage the looper thread and form a loop therein and position the same for the needle to enter, a four-motion feeding mechanism including a feed bar and feed dog for feeding the fabric, and means carried by the feed bar for engaging the looper thread when the feed bar is moved forward and for drawing on said looper thread during the setting of the stitches so as to lay said looper thread substantially straight the fabric section, thus forming loops in the v at the edge of needle thread on the upper and lower faces of the fabric which extend to the edge of the fabric section.

3. An overedging sewing machine including in combination a thread carrying needle, a thread carrying looper adapted to enter the needle thread loop, a loop carrying implement adapted to engage the looper thread and form a loop therein and position the same for the needle to enter, a feed bar, a feed dog carried thereby, a finger carried by said feed bar and adapted to engage the looper thread 7 when the feed bar is moving forward and for drawing on said looper thread during the setting of the stitches so as to lay said looper thread substantially straight at the edge of the fabric section. thus forming loops in the needle thread on the upper and lower faces of the fabric which extend to the edge of the fabric section. V

4. A sewing machine including in combination. a feeding mechanism, an overedging stitch forming mechanism including a needle and a thread carrying looper. and means for engaging the looper thread between the looper and the previously formed stitch for drawing on said looper thread during the setting of the stitches so as to lay said looper thread substantially straight at the edge of the fabric section being overedged.

5. A sewing machine including in combination. a feeding mechanism, an overedging st tch forming mechanism including a needle and a thread carrying looper. and means for engaging the looper thread between the looper and the previously formed stitch for drawing on said looper thread during the setting of the stitches so as to lay said looper thread substantially straight at the edge of the fabric section being overedged, said looper thread engaging means being actuated by said feeding mechanism. 7

6. In a sewing machine, the combination of a feeding mechanism, an overedging stitch forming mechanism including a needle and a thread carrying looper. said feeding mechanism including a feed bar. and a finger adjustably mounted on said feed bar and positioned so as to engage the looper thread between the looper and the previously formed stitch. for drawing on said looper thread during the setting of the stitches, so as to lay said looper thread substantially straight at the edge of the fabric section.

In testimony whereof, I afi'ix my signature.

ERNST HAUSSLER.

Images