US1246320A - Sewing-machine. - Google Patents

Description

Patente@ Nov. 13, 1917.

3 sHETs-sHEET x.

E. J. RAY.

SEWING MACHINE.

APPLICATION man nEc.27,1915. 1,246,320.

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E. 1. RAY.

SEWING MACHINE.

APPLlcATIoN FILED DEC.27.1915.

1,246,320. Patented Nov. 13, 1917.

3 SHEETS-SHEET 2.

E. l. RAY.

SEWING MACHINE,

APPLICATION FILED DEC.27,1915.

Patented NOV. 13, 1917.

3 SHEETS-SHEET 3.

unirme STATES rnrnnronnron, l i

EUGENE JqRAnor BnvEnLxjMAssAoi-rnsnrfrs,esslenon tro-nnirnnsnon MACHIN- ERY'COMPANYYjOF PATERSON, JERSEY, A CORPORATION OFNEW J'EIRSFY.v

Appncatio'n med December a?, 1915. seriaifno. 68,756.

T 0 @ZZ/whom t may concern.' Be it known that I, EUGENE .Il RY, a citi- Azen of the United States, residing at Beverly,

in the county oFisseXand State'of'Massachusetts, have yinvented certain new and use- A ful Improvements in Sewing-Machines; and I do hereby declare the'following to be a `full, clear, and exactjdescription of theini vention, such` as'will enable others skilled :in v the art to which it appert'ainsto inalre'and` use the same.V

The invention relatesto sewingrnachines, 1'

and more'v particularly :to machines Vfor forming overseam-stitches about the edge of a buttonhole. Y 4j Sewing machines of this type areusually provided with an upper needle and coperating loop taking devices below the work for taking a loop from Ethe upper needle *during each reciprocation.l At the completion of a sewing operation the sewing mechanism is `arrested with 'the upper needle in retracted position, and with ythe last loop Ytaken from the needle still held b v the loop taking devices. above the work, either automatically or by Vthe operator, the waste lend leads down through the last needle hole'abou't the loop taking devices to the previous stitch, and as,

the work is spacedor removed, this waste end is drawn down through the 'last needle hole by reason ofit-s engagement'wit-hthe loop `taking devices, ancl re"1na1ns as a compara-- tively long thrum end on the 'under 'sideof :the work. v I

` Onjcertai'n classes of work` these thrum ends'o'n the under side 'of the work are vseriously objectionable,*and it is theobject of the presentfinvention lto :prevent'their production. To this end the invention contemplates 'the provision in Aa. sewing machine having an upper needle and under loop taking devices, of meansfor preventing the takingof the loop from the upper needle during the final reciprocation of the needle,

so that at the completion of the sewing the needle thread will lead from .the needle down through the last needle hole and directly to the previous stitch. The severed end of the needle thread will not therefore be drawn down through the needle hole to the `under side of the work when the work is When the 'needle thread is severed 'needle Vhole-"It is preferred tovprevent Athe taking-of the loopv from the needle by a thread talreup which *isf inactive luntil the pulls-on'the thread as thenee'dle lstarts -upward, and thus keeps the thread out of the Vpath-of thelo'op taking devices. This construction' is not essential tothe broader fea- 'tures of the invention, however. f The 'invention will vbe readily understood from an inspection of the accompanying drawings, land the following detailed Ydescription of Y the mechanism illustrated therein.

, In the drawings, Figure 1 is a side eleva- Ation,"p'ar"tly in section, showing so much of a buttonhole sewing machine as is vnecessary Vtodll'ustrate the application of the present `invention thereto ;Fig. 2 is a front elevation,

partly in section, on line 2 2, Fig. 6; Figs. 3, 4 and 5 are details showing the upper needle and thread in different positions during fthe: last reciprocation of' the needle;

I'Fig.' 6is afparti'alplan view ofthe machine; `and 7 is a partial sectional view show-Vv ing the parts 'in' a yditierent position from thatshoiwn in Fig.y 2; and Fig. 8 is a de- "tai-led? section on Vline 8 8, FigjQ. l

In the drawingsthe invention is shown 'as embodied' iin' a buttonhole making ma! chine rhaving" in generalv the construction 'and mode of operationof them'ach'ineshown vand described in Patent ldd-1,063,880, ldated June 3, 1913. In this machine the stitch forming mechanism comprises an upper' needle 2, an under needle 4l,- and a looper 6, which takes a loop from the upper needle below the 'work and holds it in position for the passage of the under Avneedle therethrough. The upper needle `is carried by a needle bar 8 which isA mounted :to reciprocate in' a rotary head 10, and the under needle yand looper are mounted in a rotary turret 12. The work is held in position over the throat plate 14 by a work clamp vcom'- prising the under jaws 16 carried by the vworlr supporting plates 18, and the upper jaws 20 carried by the arms 22 which are pivoted to blocks mounted on the Work sup-v i :Specification ofiLettcrs Patent. .Patented Nvllg,l 191m 'linal 'reciprocation of the* needle, and then porting plates. The work supporting plates are mounted on a carrier 24 which is moved to bring the work from cutting to sewing position, and to feed the work during the sewing, as described in the patent above referred to. f

The upper needle thread leads from the tension device 26 through the thread kguides 28, and through a guide 30 in the end of a takeup arm 82, and then to the upper end of the hollow needle bar 8, down through which it passes to the light tension device 34 and to the eye of the upper needle. During the sewing of the buttonhole the takeup arm 32 remains in the inactive position indicated in dotted lines in Fig. 6, and during each reciprocation of the Vupper needle the needle casts out a loop, indicated in dotted lines in Fig. 4, which is taken by the looper 6 and held in position for the passage of the under needle therethrough. During the last reciprocation of the needle at the endof'the sewing operation, the takeup arm 32 is swung into the' full line position ofFig. 6 duringy the upward movement of the needle, and keeps the thread taut between the previous -stitch and the eye of the needle, as indicated in full lines in Fig. 4, so that the point I of the looper does not pass between the thread and the needle. The taking of the loop by the looper is thus prevented during the last reciprocation of the needle, and

when the sewing mechanism is arrested at.

the completion of the sewing, the thread will lead from the previous stitch along the under surface of the work and up through the last needle hole to the eye of the needle, as indicated in Fig. 5. The needle thread may be severed close to the work either automatically or by the operator, and the severed end will be retained in the last needle hole when'the work is spaced or removed, and the production of thrum ends on the lower side of the work will thus be avoided.

The means shown for operating the takeup arm 32 in the manner above described comprises a lever 36 provided Vat its free end with a gear segment 38which engages a gear segment 40 securedto the lower end of the takeup arm is secured. The lever 86 is mounted on a vertical pivot stud 44 which is forced downward by a spring 46, and the lower end of which is supported upon a controlling bar 48. The lever is provided with a depending pin 50 which is engaged by a cam 52 on the driving shaft 54 for the sewing mechanism during the last reciprocation of the needle. During the sewing of the buttonhole the lower end of the pivot stud for the lever 36 rests on the surface 56 at the end of the controller bar 48, and the lever 36 is held in raised position, as indicated in Fig. 7, so that the pin 56 is out of the f2 path of the cam 52. During the sewing, therefore, the takeup arm 32 remains in the dotted line position of Fig. 6, being held in position by the spring 58. The controller bar 48 is connected through the rack teeth 60 and the segment 62 withI ythe rock shaft 64 which carries the stop arm 66 forming a part of the mechanism for stopping the shaft 54 at the completion of the sewing operation. During the sewing the stop arm and rock shaft are swung into the dotted line position of Fig. 6, and remain in this position until the sewing mechanism is to be arrested, when they are swung into the full line position of Fig. 6 by a cam 68 on the cam gear 70, which engages an arm 7 2 on the lever to move down into the position indicated in Fig. 2, and bringing the pin 50 on the lever .into the path of the cam 52. During the last revolution of thefshaft 54 the cam 52 therefore acts to swing the takeup Vlever from dotted to full line position of Fig 6, and causes it to pull on the thread during the last upward stroke of the needle and thus prevent the taking of the loop by the looper, as above described. When the stop arm and rock shaft are swung into inactive position in starting the driving shaft 54 for the sewing mechanism, the controller bar 48 is returned to the position indicated in Fig. 7thus disengaging the pin on the lever 36 from the cam 52, so that the takeup arm 32 may return to dotted line position, preparatory to its next thread pulling movement.

While it is preferred to employ the speciiic construction and arrangements of parts shown and described, in embodying the invention in the machine of the patent above referred to, it will be understood that this arrangement is not essential, but may .be

.varied or modiiied as found desirable or best suited to the construction of machine in which it is tobe embodied.

Having explainedthe nature and object of the invention, and specificallyv described one form of mechanism in which it may be embodied, what is claimed is l. A sewing machine, having, in combination, sewing mechanism comprising a needle and cooperating loop-taking devices, means` normally inactive forpreventing the taking of the loop from the needle, a normally disconnected actuator for the preventing means, and a controller for determining the stitch forming cycle in which the actuator shall actuate said preventing means.

2. A sewing machine, having, in combinaythe pivot stud of the lever36, thus allowing of the needle, and controller means for con- A necting the actuator and takenp during a predetermined stitch forming cycle.

3. A sewing machine, having, 1n combination, sewing mechanism, a takeup, a cam 1'0- tating in time with the sewing mechanism, and a controller for connecting the cam to actuate the takeup during the final reciprocation of the needle at the completion of the sewing.

EUGENE J. RAY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. G.

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