US1315486A - Sewing-machine - Google Patents

Description

J. FOSSA.

' SEWING MACHINE.

APPLICATION FILED AUG.I3, 1911.

1,315,486. I Patented Sept. 9, 1919.

g a SHEETS-SHEET I- 1. FO SSA. SEWING MACHINE.

APPLICATION FILED AUG.13| I911.

Patented Sept. 9,1919.

3 SHEETS-SHEET 2.

l. FOSSA.

SEWING MACHINE. q APPLICATION FILED AUG- ]3. I917.

1,315,486. 9 PatentedSept. 9,1919.

3 SHEETS-SHEET 3.

ED STATES PATENTOFFIGE JOSEPH FOSSA, on nnwYoninn. y., iissm nir irnsnn nssiemunnrs, T UNITED snon MACHINERY CORPORATION, OF rnrnnson, NEW JERSEY, ACORPORATION on NEW JERSEY. y

sn wme-mnenmn.

To all whom it may concern: 1

Be it known that I, JosErH FossA, a c1t1- zen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whih it appertains to make and use the same. 1

The invention relates to thread severing and holding mechanism for sewing machines.

The object of novel and improved mechanism .w ich is well adapted for severing the upper needle thread of a buttonhole makin machine at the completion of a buttonhole, and for holding the severed end preparatory to the sewing of a succeedingbuttonhole, and which may be arranged to sever the thread close to the work and also to hold the free end at the beginning of the seam close to the work and in position to be covered by the overseam, so that both waste ends of thread a comparatively short, and the end at the beginning of the seam may be uniformly and completely covered thereby.

the application of the present invention there to; Fig. 2 is a sectional plan view showing the mechanism for operating the thread1 holding and cutting devices; Fig. 3 a detail side elevation of the thread holding and cutting devices, one plate of the supporting bracket being removedfto show the parts which are mounted in the guldeway within plate which is removed from Fig. 3-; Flg. 5 IS a sectional View on line 5 of Flgs. 3 and 4; Fig. 6 is a sectional view on 1111s 6 of Specificationof Letters Patent.

the invention is to rovicle To these ends the invention com rises the elevation showingso much of a buttonhole: sewing machlne as is necessary to lllllSliI'EllJB the support; Fig/leis a. detail view of the Figs. 4;; Fig. 7 is a view showing the carrier sllde for the thread finger and the thread holding andcutting plates detached;

and Figs. 8 to17 inclusive are a series of views illustrating the mode of operation of the thread holding and cuttingdevices.

Inthe drawings the invention is shown as embodied in a buttonhole sewing machine having the construction and mode of operation of the machineshown and described in Patent No. 1,063,880, dated June 3, 1913. In this machine the stitchforming mecha- 1118111 comprises an upper needle 2 eccentrically mounted in a vertically reciprocat ing needle bar 4, an under needle 6, and a looper *8. The upper needle bar is mounted in a rotar header carrier 10 The under needle looper are mounted in a rotary turret 12 which is rotated in unison with the head 10. llhe work is held by clampsl i pivotally mounted on the work supporting plateslfi, whichare in turn mountedcon a clamp carrier 18.="The clamp carrier is moved lengthwise of the buttonhole to bring the Work into register with the cutter or with thesewing mechanism and to feed the work during the sewing by a cam groove.

formed in the cam gear 20 which makes one revolution for each cycle of the machine. The-clamp carrier is moved laterally and the stitch forming mechanism is. rotated durin the sewing through suitable connectionsir lutionflduring the. sewing of a f buttonhole. The cutter 24 is operated from a cam on the ream .gear,and when operated to cut a buttonhole, also acts to close the clamps. The clamps are held closed during the sewing by latching; devices, and are released during the return {of the cuttencarriage to cutting position, as fully described in the patent above referredto. At the completion of. the sewing of buttonhole the stitch forming mechanism is stopped with the up per and under needles in their retracted positions, and with the upper needle thread about the looper, as indicated in Fig.1.

The means for severing and holding the thread atthe completion of the sewing comprises a thread engaging finger wh ch is mounted to swine transversely of the stand ing needlethrea so thatthe thread is deflected into posltlon toube acted on by clamp- Patented Sept. 9, 1919. Application filed August 13,1917. Seria1No.185,905. i

om a gear 22 which makes .onerevoing and cutting plates which pass on opposite sides of thefinger and cooperate therewith to clamp and sever the thread. To adapt the holder to present and maintain the held end of the thread in line with the stitches being sewn at the beginning of the seam, the holder is mounted to move laterally of the seam as the sewing mechanism'is rotated at the beginning of the sewing, thus maintaining the thread in alinement with the seam while the end is being covered thereby. This movement is preferably secured by mounting the thread holder and cutter on the rotary needle carrier so that it remains in fixed relation to the sewing mechanism during the rotation of this mechanism.

In the construction shown the thread engaging finger '26 projects laterally froman arm 28 mounted to swing about a 'horiz onta1 pivot 30 on the lower end-of a vertlcally movable carrier slide 32., The carrier slide is mounted in asubstantially vertical guideway formed in a supporting bracket 34 which is secured to a plate 36 on the lower end of the rotary needle Carrier 10. The carrier slide is held in the guideway'in the bracket by a.

coverv plate 38. secured tothe side ,of the bracket. The thread clamping plate 40 and the thread cutter plate 42 are mountedwithin unison by. an arm 44 which projects from the cutter plate through a slot 46 in the upper end of the carrier slide 32, and fits within a slot 48 in the upper end of the thread clamping plate 40. An arm 50 projects from the opposite side of the plate 42 through a slot in the supporting bracket 34 and into position to be engaged by the forward end of an operating lever 52 when the sewing mechanism is in its stopped position. A similar arm 54 projects from the carrier slide 32 through the slot in the supporting bracket and into position to be engaged by an operating lever 56 which also underlies the arm 50. The carrier slide and the plates are forced downward by spring-pressed pins 58 and 60 which are mounted within recesses in the, plate 38 and engage arms 62 and 64 which project into the recesses from the carrierslide and cutter plate. The downward movement of the carrier slide and cutter and clamping plates is determined by the engagement of the arms with the lower ends of the recesses. The inner end of the thread arm 28 isengaged by a leaf spring 66 which tends to swing the arm laterally about its pivot and to carry the thread finger to the opposite side of the needle path, as indi-' cated in Figs. 1, 3, 8 and 9. When the cutter and clamping plates are in their lower position they hold the thread arm in substantial alinement with the carrier slide against the pressure of the spring 66.

Durin the sewing of the buttonhole, the carrier slide and the thread cutter and thread clamp plates are in their lower positions at one side of the needle path. After the sewing is completed the lever 52 is operated to raise the cutting and clamping plates into the position indicated in Fig. 3, so that the thread arm 28 is swung laterally to bring the thread finger on the opposite side of the needle path. As the work clamp is retracted toward cutting position the thread is carried toward the thread arm and into position to, be engaged by the thread finger, as indicated in Fig. 10. The lever 52 then releases the cutting and clamping slides, which are forced quickly downward to their lower position by-the spring-pressed pin 60. During the first part of this movement the lates act on the thread arm 28 to swing it aterally about its pivot, as indicated in Fig. 11. This movement of the thread arm carries the thread finger against the standing thread and obliquely downward toward the work, so that the thread is bent or looped about the thread finger which, when in its lower position, is close to the upper surface of the work. The final downward movement of the thread clamping and cutting plates carries the clamping plate along the front face of the thread finger, thus clamping the thread, and carries the lower edge of the cutter plate over the rear surface of the thread finger, thus severing the thread, as indicated in Fig- 12. As the work clamps are opened the operating lever 56 acts to raise both the carrier, slide 32 and the thread clamping and cutting plates into the position indicated in Fig. 13, so that they will not interfere with the opening movement of the work clamps. When the machine is started in making the succeeding buttonhole, the operating lever 56 allows the carrier slide and the plates to move downward into their lower position, as in dicated in Fig. 14, so that they hold the thread end close to the work during the sewing of the initial stitches. The upper needle enters the work in line with the buttonhole in forming the initial stitch, as indicated in Fig. 16, and during the sewing of the first few stitches of the scam the sewing mechanism is rotated through a quarter of a revolution. The support for the thread holder is arranged to hold the thread end in position to be covered by the initial stitches of the seam and substantially in alinement with the seam, as indicated in this figure. During the rotation of the sewing mechanism through a quarter revolution the thread holder is swung laterally and toward the buttonhole slit, so that the thread is maintained in alinement with the seam as the seam progresses, and until the thread end springsfiS and 'ZO indicated in Figs. 1 and 2. The levers are rocked at the proper intervals by cams 72 and 74 secured to the cam gear 20, as indicated in Figs/ 1 and 2.,

The cam 72 engages an arm 7 6 secured to a rock shaft 78, the outer end of which carries an arm 80 which is connected to the rear end of the lever 52 by a pin and slot connection 82. The cam 74: engages one arm of a lever 84 which is mounted to turn on the rock shaft 78, and the other end of which is connected by a pin and slot connection 86 with the rear end of the lever 56.

While it is preferred to employ the spe cific construction and arrangement of parts shown and described, especially in embodying the invention in a machine of the patent above referred to, it will be understood that this construction and arrangement is not essential to the broader features of the invention, but may be varied or modified as found desirable or best suited tothe construction and mode of operation of the machine in which the invention is to be incorporated.

Having explained the nature and object of the invention, and specifically described one form of machine in which it may be embodied, what is claimed is 1. A sewing machine, having, in. combination, a rotary stitch forming mechanism, thread severing andholding devices mounted to move with the stitch forming mechanism in its rotary movement, an mechanism for actuating the devices to sever and hold the thread at the completion of the sewing.

2. A sewing machine, having, in combination, an upper needle and means cooperating therewith to form overseam stitches, a rotary carrier for the upper needle, and devices for severing and holding the needle thread above the work mounted to rotate with the carrier. v i

3. A sewing machine, having, in combination, an upper needle and means cooperating therewith to form overseam stitches, a

rotary carrier for the upper needle, and means moving with the carrier in its rotary movement for holding the end of the needle thread in line with the seam until covered thereby.

4:. A sewing machine, having, in combination, an upper needle and means cooperating therewith to form overseam stitches, a rotary carrier for the upper needle, mech anism for rotating the upper needle carrier timed to turn it during the sewing of the main airtime, a thread holder a toiaitg the end offtheneedle thread at the begin hing of the sewing, andmeans for movlng the holder transversely of the seamdurlng the turning of the needle carrier to main tain the thread in alinement therewith.

' 5. A sewing machine, having, in combina: tion, stitch forming mechanism comprising a vertically"reciprocating. needle, a thread engaging finger mounted to swing about a horizontal axis and to deflect the standing needle thread at the completion of the sewing, and reciprocating thread clamping and cutting members cooperating with the op positesides of the finger.

6. A sewing machine, having, in combination, stitch forming mechanism comprising a vertically reciprocating needle, a thread engaging finger mounted to move in an inclined direction toward the work in deflecting the standing needle thread, and thread clamping and cutting members cooperating with the finger in its lower position.

,7. A sewing machine, having, in combination, stitch forming mechanism comprising a vertically reciprocatlng needle, a thread finger mounted to reciprocate transversely of the standing needle thread, and vertically reciprocating thread clamping and cutting plates mounted to pass on opposite sides of the finger.

8. A sewing machine, having, in combination, stitch forming mechanism comprising a vertically reciprocating carrier, a thread finger pivoted to the lower end of the carrier, and thread clamping and cutting plates mounted to reciprocateon opposite sides of the carrier and finger. l a

9. A sewing machine, having, in combination, a work clamp, stitch forming mecha nism comprising an upper needle and a complementary under thread mechanis rotary supports for the stitch forming mechanism, thread cutting and holding devices mounted to rotate with said supports, and mechanism for operating the devices to sever and hold the needle thread above the work at the completion of the sewing.

10. A sewing machine, having, in combination, a work clamp, stitch forming mechanism comprising an upper needle and a complementary under thread mechanism,

rotary supports for the stitch forming and for moving them away from and toward the Work.

11. A sewing machine, having, in combination, stitch forming mechanism comprising a vertically reciprocating needle, a rotary carrler therefor, a substantially vertical support secured to the carrier at one side of the needle path, a vertically movable carrier slide in the support, a thread finger pivoted to the lower end of the slide to swing laterally to the opposite side of the needle path,.and thread clamping and cut ting plates arranged to reciprocate on opposite sides of the carrier slide and thread finger, a

12. A sewing machine, having, in combination, rotary stitch forming mechanism, thread severing and holding devices mounted to rotate with the stitch forming mechanism, and mechanism for moving the devices toward the needle path, operating them to sever and grip the thread, and then returning them to their initial position.

JOSEPH FOSSA.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

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