US735432A - Thread-cutting device for sewing-machines. - Google Patents

Thread-cutting device for sewing-machines. Download PDF

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US735432A
US735432A US11147502A US1902111475A US735432A US 735432 A US735432 A US 735432A US 11147502 A US11147502 A US 11147502A US 1902111475 A US1902111475 A US 1902111475A US 735432 A US735432 A US 735432A
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thread
needle
work
lever
cutter
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US11147502A
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Edward B Allen
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Singer Co
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Singer Co
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B65/00Devices for severing the needle or lower thread

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  • the invention comprises a thread-cutting device arranged" above the work andhaving a knife orblade for severing the lower or shuttle thread, preferably controlled in its action froin the stop-motion mechanism of the machinefln combination with automatic means for drawing up a loop or bight of the lower-thread at a propertime to bring said lower thread within the range of movement of the said knife or b1ade,js'aid thread-cutting device also preferably com-w prising a second ⁇ knife or thread-cutter and a thread-nipper codperating therewith to sever the necdle-threadat the same timethe lower thread is severed and then hold the end of the thread running to :the needle until after it is fastenedin the work at the next succeed-Q ing stitch forming operation.
  • a rod 31 Jointed at its forward end to the lever 24 is a rod 31, passing loosely through the lower arm of a lever 32, pivoted on a stud 33, fixed to the arm 12, said rod having at its rear end a collar 34,held in contact with the said lever 32 by a spring 35, connected with said rod and with the work-clamp.
  • the construction just described afiords a loose connection between the lever 32 and the rear end of the rod 31, and which loose connection might be provided for by a balland-socket joint or equivalent construction which would permit the forward end of the rod 31 (which is connected with the horizontally-movable workclamp) to have at times a limited free movement independent of the said lever 32.
  • the cutter-lever 28 is connected by a rod 36 with a spring 37, which is attached to a collar 39, secured to said rod, and which has a tendency to draw said rod rearward, said rod passing loosely through thelower arm of a lever 38, also pivoted on the stud 33.
  • the rod 36 is providedwith a collar 40, which limits the rearward movement of said rod relative to said lever 38 under the influence of said spring, and the upper arm of the said lever 38 is provided with a stud 41, to be engaged at times by a cam '42 on the cam-cylinder 21 to operate the said lever in opposition to the stress of the said spring 37.
  • the cutting device should remain closed to retain the end of the thread in the nipper until the said thread has been secured to the work at the formation of the next group of stitches, after which the cutting device must be opened for the next thread-cutting operation.
  • the lower end of the lever 38 is against the stop 43, with the stud 41 at the upper end of said lever in such position as to be in the path of movement of the cam 42, which will come intocontact with the said stud after two or three stitches of the next group have been formed and so as to move the lower arm of said lever forward away from the said stop, and thus acting on the collar 39 will move the rod 36 forward to open the cutting device.
  • the rod 53 has a jointed connection near its lower end with the latch-lever 48, so that the upper end of said rod is free to follow the back-and-forth movements of the belt-shipper 17, with which the upper part of said rod is loosely connected, so that when thesaid belt-shipper is in a position to guide the driving-belt on the fast pulley 16 the hook 54 will be out of the path of movement of the tripping-pin 55 on said fast pulley; but when the belt-shipper is moved to transfer the belt to the loose pulley 15 the said hook is brought into the'path of movement of the said tripping-pin.
  • a thread-cutting device comprising automatic means for drawing up the lower thread and for severing both ICC threads, above the work, and also for nipping and holding the end of the upper or needle thread until it has been attached to the work by stitches succeeding the th read-severing operation.
  • the combination with upper and lower thread carrying stitchforming devices and a stop-motion mechanism through the instrumentality of which groups each comprising a predetermined number of stitches may be formed, of mechanism for drawing up and severing the lower thread above the work, without disturbing or releasing the latter, at the completion of a stitchforming operation.
  • a thread-cutting device for severing the lower thread above the work and comprising a finger located above the work and a lower thread-severing blade or cutter below said finger, and automatic means for bringing up the lower thread to cutting position.
  • an automatic thread-cutting device comprising a thread-nipping finger located above the work and a doublebladed thread -cutter working beneath said finger, and automatic means for bringing up the lower thread to cutting position.
  • thread-cutter located above the work-plate, for severing the lower thread above the work
  • a take-up device for the upper or needle thread for operating said cutter, a take-up device for the upper or needle thread, a threadclamping device arranged to act on the said needle-thread, between the said take-up and the thread-supply, just before the time of the thread-cutting operation; so that the said take-up, acting through the needle-thread, will, after a certain stitch has been tightened in the usual manner, draw up the lower thread into position to be severed by the said thread cutter, instead of drawing needlethread from the thread-supply, as usual.
  • a thread-nipping device for holding the end of the upper or needle thread when severed

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

PATENTED AUG. 4, 1903.
I E. B. ALLEN. THREAD .GUTTING DEVICE FOR SEWING MACHINES.
APPLIOATION FILED JUNE 13, 1902.
3 SHEETS-SHEET 1.
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myvamsz. L PATENTED AUG, 4, 1903.
' E.'B. ALLEN.
THREAD CUTTING DEVICE FOR SEWING MACHINES.
- APPLIOATION FILED mm: 13, 1902.
N0 MODEL. 3 SHEETS-SHEETQ.
. mhllh mllllllm I lll m PATENTED AUG. 4, 1903.
} E. B. ALLEN. THREAD CUTTING DEVICE FOR SEWING MACHINES.
APPLICATION rum) mm; 11%,, mm
a SHEETS-SHEET a.
' i To all whom/it may concern: 1
UNIT STATES,
PATENT lE ate nte d August 4,
OFFICE.
EDWARD A L N. 9 ELIZA ETH JERSE A G .T E SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.
TI IREAb-CUFTING DEVICE FOR SEWING-MACHINES;
SPECIFICATIONforniing part of Letterslzatent no. 735,432, dated Au st 4, 1903. A Application filed June 13,1902. 2SrialNoi11L475. (No model.)
Be it known that I, EDWARD B. ALLEN, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New J ersey-,-have invented certain new and useful Improvements in Thread-CnttingDevices for. Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.
This invention has for its object to provide an automatic thread-cutting mechanism for sewing-machines whereby ator after the completion of a group of a predetermined num ber of stitches--as in-barring, staying, stitching butt-onholes, sewing on buttons, &c.-the lower or shuttle thread of the machine will be drawn up and severed above the work and the needle-thread will preferably also be antomatically severed above the work simultaneously with the severing of the lower thread.
To this end' the invention comprises a thread-cutting device arranged" above the work andhaving a knife orblade for severing the lower or shuttle thread, preferably controlled in its action froin the stop-motion mechanism of the machinefln combination with automatic means for drawing up a loop or bight of the lower-thread at a propertime to bring said lower thread within the range of movement of the said knife or b1ade,js'aid thread-cutting device also preferably com-w prising a second {knife or thread-cutter and a thread-nipper codperating therewith to sever the necdle-threadat the same timethe lower thread is severed and then hold the end of the thread running to :the needle until after it is fastenedin the work at the next succeed-Q ing stitch forming operation.
In the accompanying drawings, Figure 1 is a side elevation "of a Singer*barring and staying machine with'the present invention applied thereto. of the same. Fig'. 3is a plan view, partlyin horizontal section on line 3 3, Fig. 1, looking down on the work-plate and showing some of the thread-cutting mechanism in detail.
Figs. 4, 5, 6, and 7 are detail views of the thread-cutting device with the parts in different positions in the different views to illusirate their operation, but with the needlef1896, to which reference may be had fora full Fig. 2 is a front endviewthreadni'pping finger omitted for clearrie'ss" of illustration. Fig. 8 is a view similar to Fig; 6,but showing the thread-nipping fin ger. Fig. 9 is a detail elevation or edge view of thecutting device. Fig. -10 is a detail View of a part of the cutter opening lever to show its relation to its operating-cam. Fig. 11 is a detail view of the thread-nipping clamp. Fig. 12 isa detail view to show the manner of laying the needle-thread over the threadfinger.
Referring to the drawings, 12 denotes the arm, and 13 the work-plate, of the machine.
The driving-shaft 1-1 is jo urnaled in the up per portion of the arm and isprovided with jastart and stop motion device of well-known form and comprising a loose pulley 15 and a fast pulley 16, on either of which a power gdriving-belt may be run by mean'sot' a belt shipper 17, carried by a controlling-lever 18. :Thenedle-bar 19 is mounted in a swinging frame or gate 20,so as to be adapted tobe moved horizontally, and the horizontal movements of the needle-bar frame or gate are derived from an intermittin gly-rotatin g cam-cylinder 21, from which horizontal swinging movements of the work-clamp are also derived, all as fully shown and described in UnitedStates Patent No. 568,338,granted September 29,
understanding of such parts of the machine "herein shown as do not concern the present invention. p Fixed to the shank 22 of one of the presserfeet forming the upper members of the work- .clamp is a plate or bracket 23, on which is mounted a lever 24, pivotally secured to said plate or bracket by a screw 25, said leversupporting the thread cutting and thread-nipping devices comprising a ledger-blade 26 and a thread nipping and stitch finger 27,
ver, which in such instance will of course be of steel, as will also be the thread-cutting lever 28, pivoted to the lever 24 between the blade 26 and finger 27, and having the blade both preferablyformed integral with said 16- 29 for severing the lower or shuttle thread and the blade 30 for severing the needlethread.
Jointed at its forward end to the lever 24 is a rod 31, passing loosely through the lower arm of a lever 32, pivoted on a stud 33, fixed to the arm 12, said rod having at its rear end a collar 34,held in contact with the said lever 32 by a spring 35, connected with said rod and with the work-clamp. The construction just described afiords a loose connection between the lever 32 and the rear end of the rod 31, and which loose connection might be provided for by a balland-socket joint or equivalent construction which would permit the forward end of the rod 31 (which is connected with the horizontally-movable workclamp) to have at times a limited free movement independent of the said lever 32.
The cutter-lever 28 is connected by a rod 36 with a spring 37, which is attached to a collar 39, secured to said rod, and which has a tendency to draw said rod rearward, said rod passing loosely through thelower arm of a lever 38, also pivoted on the stud 33. The rod 36 is providedwith a collar 40, which limits the rearward movement of said rod relative to said lever 38 under the influence of said spring, and the upper arm of the said lever 38 is provided with a stud 41, to be engaged at times by a cam '42 on the cam-cylinder 21 to operate the said lever in opposition to the stress of the said spring 37. The rearward movement of the lower arm of the lever 38'under the stress of the said spring 37 is limited by a suitable stop, which in the presout instance is an upturned lug 43 on a plate 44, attached to the Work-plate 13, and the forward movement of the lower arm of the lever 32' under the stress of the spring 35 is similarly limited by a suitable stop, consisting in .the present instance of an upturned lug 45 on a plate 46, also attached to the work-plate by the screw 47, which serves to hold the plate 44 in place.
It is necessary when the needle-thread has been severed that the cutting device should remain closed to retain the end of the thread in the nipper until the said thread has been secured to the work at the formation of the next group of stitches, after which the cutting device must be opened for the next thread-cutting operation. When the cutting device is closed, the lower end of the lever 38 is against the stop 43, with the stud 41 at the upper end of said lever in such position as to be in the path of movement of the cam 42, which will come intocontact with the said stud after two or three stitches of the next group have been formed and so as to move the lower arm of said lever forward away from the said stop, and thus acting on the collar 39 will move the rod 36 forward to open the cutting device. In such forward movement of the lower arm of the lever 38 it rides over .the forward end of a latch-lever 48 (loosely mounted for a limited vertical movement on a block49, attached to the work-plate 13) until it passes a stop-shoulder 50, when the said shoulder will be lifted into holding engagement with the said lever 38. To this end the rear end of the said latch-lever is forced yieldingly downward by a coil-spring 51, acting on a-collar 52, secured to a rod 53, connected at its lower end to'said latch-lever 48 and having at its upper end a hook 54 to engage a tripping-pin 55 on the fast pulley 16, said tripping-pin being so located on said pulley that it will engage the said hook 54 and lift the rod 53 slightly just before the said pulley comes to rest when the machine is automatically stopped at the completion of a group of stitches. VVhen the said latchlever is thus tripped, the spring 37 suddenly draws the rod 36 rearward to operate the cutters to sever the threads, as will hereinafter appear.
The rod 53 has a jointed connection near its lower end with the latch-lever 48, so that the upper end of said rod is free to follow the back-and-forth movements of the belt-shipper 17, with which the upper part of said rod is loosely connected, so that when thesaid belt-shipper is in a position to guide the driving-belt on the fast pulley 16 the hook 54 will be out of the path of movement of the tripping-pin 55 on said fast pulley; but when the belt-shipper is moved to transfer the belt to the loose pulley 15 the said hook is brought into the'path of movement of the said tripping-pin.
Connected with the belt-shipper 17 is a rod 56, having a collar 57 arranged to engage the upper arm of the lever 32, through which the said rod 56 loosely passes, said rod having at its forward end a suitable abutment, as nut 58, arranged when the said rod is drawn rearward by the belt-shipper to engage a yielding arm or spring of a thread-clamp 59 to grip the needle-thread passing through the said thread-clamp from the spool or other thread-supply to the take-up 62, such threadgripping action occurring when the belt-shipper is moved rearward to shift the belt to the loose pulley to stop the machine. The collar 57 is so located on the rod 56 that when the machine is running the rod 31 will hold the lever 24 in such position that the finger 27 will be forward or outside of the vertical plane of the needle 60, as indicated by the positions of the parts in Figs. 4 and 5, in which the vertical plane of the needle will be understood by the dotted needle-throat 61; but when the belt-shipper is moved to stop the machine (one stitch, due to momentum, being formed after the belt-shipper is thus moved) the said lever 24 is shifted by the spring 35 to move the finger 27 to the threadcutting position denoted by Figs. 6, 7, and 8.
The operation of the invention is as follows: When the machine is stopped, the parts of the thread-cutting device will be in the position shown in Fig. 3, with the needle-threadcutting parts of the cutter closed and with the finger 27 inside or rearward of the vertical plane of the needle. When the belt shipper is moved to start the machine, the collar 57 on the rod 56, connected with the beltshipper, strikes the upper arm of the lever 32, which through the rod 31 swings the lever 24 into the position shown in Fig. 4, with the finger 27 outside or forward of the vertical plane of the needle, but without opening the needle-thread cutting and nipping device, so that the end of the needle-thread will still be retained by the thread-nipper and will be held close to the needle-throat. Owing to the fact that the jointed connection of the cutter-operating rod 36 with the cutter-lever 28 is (when the cutter is closed) coincident,
. or substantially so, with the vertical plane of the fulcrum of the said lever 24, the said lever 24 maybe moved without any relative movement of the said cutter-lever when the needle-thread cutting and nipping device is closed, as will be understood. After the machine has been started and the needle-thread has been attached to the work by the formation of two or three stitches thecam 42 engages the stud 41 at the upper end of the lever 38, causing the lower arm of said lever to engage the collar 40 on the rod 36 to move said rod forward to operate the cutter-lever and open the needle-thread cutting and nipping device, as indicated by Fig. 5, this movement of the cutter-lever also bringing the lower thread-cutting blade into register with the ledger-blade 26 and the finger 27, which overlies the said ledger-blade, but which finger 27 is omitted from Figs. 4, 5, 6, and 7for clearness of illustration of the other parts,
although shown in Fig. 8. The parts of the cutting device remain in the positions indicated by Fig. 5 until the stop-motion-con trolling lever 18 is tripped, when the rearward movement of the belt-shipper will withdraw the collar 57 from the upper arm of the lever 32, thus permitting the spring 35 to draw the rod 31 and the lower arm of the said lever 32 forward to swing the lever 24 to the position denotedby Fig. 6 to bring the ledger-blade 26 and the finger 27 inside or rearward of the vertical plane of the needle. .When the machine is running by power at the usual speed, the incidental momentum will cause nearly a complete rotation of the l driving-shaft to be performed after the beltgripped by the saidthread-clamp, so that when the take-up 62 (operated, as usual, from the cam 63 on the driving-shaft) reaches its highest or final thread-tightening position it.
cannot draw needle-thread from the threadsupply, as usual, and it will therefore, owing to such thread-gripping or thread-stopping action, draw up a bight of lower or shuttle thread, (running up from the shuttle 64,) with which said needle-thread is interlooped, over the finger 27 and also over the lower-threadcutting blade 29, as will be understood from Fig. 12, and the needle-thread will also at this time extend up across the ledger-blade 26 and also across the path of movement of the needle-thread-cutting blade 30. With the threads disposed as indicatedin Figs. 6 and 8 a sudden movement of the cutter-lever from the position shown in said figures to the position shown in Figs. 3 and 7 causes the keen forward edge of the blade 29 to sever the lower or shuttle thread quite close to the work, and the blade 30 will also sever the needle-thread and nip the end thereof running to theiieedle between the upper dulledged side of said blade 30 and the threadnipping finger 27, where it will be retained until released after the commencement of the next stitch-forming operation, as already described. The cutter-leveris operated to sever the threads at the finish of the machine-stopping operation, owing to the tripping of the latch-lever 48 to release the cutter-operating rod 36 from the pin on the fast pulley acting through the hooked rod 53, as has been stated.
The invention is not to be understood as being limited to the details of construction herein shown and described, as these may be varied widely without departing from the essential feature of the invention, consisting,
broadly, in mechanism for drawing up and severing the lower or shuttle thread above the work-plate of a two-thread sewing-machine and preferably, also, simultaneously therewith severing the needle-thread by the same thread-cutting device which severs the lower thread and nipping the severed end of the needle-thread above the work.
Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of mechanism for drawing up and severing the lower thread above the and adjacent to the work without removing or releasing the latter from its holding means.
2. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of automatic means for drawing up and severing the lower thread above and adjacent to the work.
' 3. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a thread-cutting device comprising mechanism for drawing up the lower thread and for severing both threads above the work without removing or releasing the latter from its holding means.
4. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a thread-cutting device comprising automatic means for drawing up the lower thread and for severing both ICC threads, above the work, and also for nipping and holding the end of the upper or needle thread until it has been attached to the work by stitches succeeding the th read-severing operation.
5. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices and a stop-motion mechanism through the instrumentality of which groups each comprising a predetermined number of stitches may be formed, of mechanism for drawing up and severing the lower thread above the work, without disturbing or releasing the latter, at the completion of a stitchforming operation.
6. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices and a stop-motion device for arresting the operation of the stitch-forming mechanism when a group of a predetermined number of stitches has been formed, of automatic means for drawing up and severing the lower thread above the work at the completion of a stitch-forming operation.
7. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices and a stop-motion device for automatically arresting the operation of the stitch-forming mechanism, when desired, of an automatic thread cutting device, controlled by said stop-motion device, for drawing up and severing the lower thread above the work at the completion, of a stitch-form ing operation.
8. In a sewing-machine, the combination with upper and lowerthread carrying stitchforming devices, and a stop-motion device for automatically arresting the operation of the stitch-forming mechanism, when desired, of anautomatic thread-cutting device for drawing up-and severing both threads above the work at the completion of a stitch-forming operation.
9. In a sewing-machine, the combination with upper and lower thread carrying stitch forming devices, and a stop-motion device for automatically arresting the operation of the stitch-forming mechanism when desired, of an automatic thread cutting device, controlled by said stop-motion device, for drawing up the lower thread and for severing both threads above the work at the completion of a stitch-forming operation,
10. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, and a stop-motion device for automatically arresting the operation of the stitch-forming mechanism, when desired, of an automatic thread-cutting device for drawing up the lower thread and for severing both threads above the work at the completion of a stitch-forming operation, and means for holding the end of the upper or needle thread until it has been attached to the work by stitches succeeding the thread-severing operation.
11. In a sewing-machine, the combination forming-devices, and a stop-motion device for automatically arresting the operation of the stitch-forming mechanism, when desired, of an automatic thread cutting device, controlled by said stop-motion device, for drawing up the lower thread and for severing both threads above the work at the completion of a stitch-forming operation, and means for holding the end of the upper or needle thread until it has beenattached to the work by stitches succeeding the thread-severing operation.
12. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a thread-cutting device for severing the lower thread above the work and comprising a finger located above the work and a lower thread-severing blade or cutter below said finger, and automatic means for bringing up the lower thread to cutting position.
13. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a thread-cutting device for severing both threads above the Work and comprising a finger located above the work and a double-bladed thread-cutter working beneath said finger, and automatic means for bringing up the lower thread to cutting position.
14. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, an automatic thread-cutting device comprising a thread-nipping finger located above the work and a doublebladed thread -cutter working beneath said finger, and automatic means for bringing up the lower thread to cutting position.
15. In asewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, an automatic thread-cutting device comprising a thread-nipping finger located above the work and a double -bladed thread cutter working beneath said finger, means for drawing up the lower thread to cutting position, and means, controlled by said stop-motion device, for actuating said cutter at the completion of a'stitching operation.
16. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, an automatic thread-cutting device comprising a thread-nipping finger located above the work, and a doublebladed threadcutter working beneath said finger, means for drawing up the lower thread to cutting position, mechanism, controlled by said stop-motion device, for actuating the said thread-cutter at the completion of a stitching operation, and automatic means for releasing the end of the upper or needle thread, held by the thread-nipper, after the said needle-thread has been attached to the work'by stitches succeeding the thread-severing operation.
17. In a sewing-machine, the combination with upper and lower thread carryin g stitchforming devices, of a cutter, for severing the lower thread, located above but adjacent to the work-plate or throat-plate, means for operating the said cutter, a thread-drawing device acting on the upper or needle thread, and a thread-clamping device operated to clamp the needle-thread between the said thread-drawing device and the thread-supply just before the time of the thread-cutting operation, so that the said thread-drawing device, acting through the needle-thread, will draw up the lower thread into position to be severed above cutter.
18. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a cutter, for severing the lower thread, located above but adjacent to the work-plate or throat-plate, means for operating the said cutter, a take-up for the upper or needle thread, and a thread-clamping device operated to clamp the needlethread between the said take-up andthe thread-supply just before the time of the thread-cutting operation, so that the said take-up, acting through the needle-thread, will draw up the lower thread into position to be severed above the work by the said cutter. a,
19. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a thread-cutter, located above the work-plate, for severing the lowerthread above the work, means for operatingsaid cutter, a threaddrawing device acting on the upper or needle thread, and a thread-clamping device arranged to act on the said upper or needle thread, between the said thread-drawing device and the thread-supply, at the time of the thread-drawing operation so that the said thread drawing device, acting through the needle-thread, will drawup the lower thread into position to be severed above the work by the said thread-cutter.
20. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a thread-cutter, located above the work-plate, for severing the lower thread above the work, means,'controlled by the said stop -motion device, for operating said cutter, a threaddrawing device acting on the upper or needle thread, and a thread-clamping device arranged to act on the said upper or needle thread, between the said thread-drawing dea a vice and the thread-supply, at the time of the thread-drawing operation; so that the said thread-drawing device, acting through the needle-thread, will draw up the lower thread into position to be severed above the work by the said thread-cutter.
21. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a
the work by the said ranged to act on the said upper or needle thread, between the said thread-drawing device and the thread-supply, at the time of the thread drawing operation; so that the said threaddrawing device, acting through the needle-thread, will drawup the lower thread into position to be severed above the work by the said thread-cutter.
22. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a thread-cutter, located above the work-plate for severing the lower thread above the work, means for operating said cutter, a take-up device forthe upper or needle thread,a threadclamping device, arranged to act on the said needle-thread, between the said take-up and the thread-supply, just before the time of the thread-cutting operation, so that the said take-up, acting through the needle-thread, will, afteracertain stitch has been tightened in the usual manner, draw up the lower thread into position to be severed by the said threadcutter, instead of drawing needle-thread from the thread-supply, as usual.
23. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a
thread-cutter, located above the work-plate, for severing the lower thread above the work,
means, controlled by said stopmotion device, for operating said cutter, a take-up device for the upper or needle thread, a threadclamping device arranged to act on the said needle-thread, between the said take-up and the thread-supply, just before the time of the thread-cutting operation; so that the said take-up, acting through the needle-thread, will, after a certain stitch has been tightened in the usual manner, draw up the lower thread into position to be severed by the said thread cutter, instead of drawing needlethread from the thread-supply, as usual.
24. In a sewing-machine, the combination thread-cutter, located above the work-plate,
for severing the lower thread above the work, means for operating said cutter, a take-up device for the upper or needle thread, a threadclamping device, controlled by said stop-motion device, arranged to act on the said needle-thread, between the said take-up and the thread-supply, just before the time of the thread-cutting operation, so that the said take-up, acting through the needle-thread, will, after a certain stitch has been tightened in the usual manner, draw up the lower thread into position to be severed by the said threadcutter, instead of drawing needler thread from the thread-supply, as usual.
25. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a double thread-cutter, located above the workplate, for severing both threads above the work, means for operating said thread-cutter,
a thread-nipping device for holding the end of the upper or needle thread when severed,
a thread-drawing device acting on the upper or needle thread, a thread-clam ping device arranged to act on the needle-thread between th'e'said thread-drawing device and the threadsupply just before the time of the thread-cut ting operation, to enable the said threaddrawing device, acting through the upper or needle thread, to draw up the lower thread into position to be severed by the said thread- "cutter at the same operation at-which the 'clamping device arranged to act on the neodle-thread between the said thread-drawing device and, the thread-snpplyjust before the time of the thread-cutting operation; to enable the said thread-drawing device, acting through the upper or needle thread, to draw up the lower thread into position to be severed by thesaid thread-cutter at the same operation at which the upper or needle thread is severed.
27. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices, of a stop-motion device, a double thread-cutter, located above the workplate, for severing both threads above the work,means for operating said thread-cutter, a thread-nipping device for holding the end of the upper or needle thread when severed, a thread-drawing device acting on the upper or needle thread, a thread-clamping device controlled by said stop-motion device and arranged to act on the needle-thread between the said thread-drawing device and the threadsupply, just before the time of the thread-cutting operation, to enable the said threaddrawing device, acting through the upper or needle thread, to draw up the lower thread into position to be severed by the said th readcutter at the same operation at which the upper or needle thread is severed.
28. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices and a plate having a needlethroat, of a thread cutting and nipping device above but closely adjacent to the said needle-throat and comprising means for severing both threads above the work, and a finger cooperating with a cutting-blade to hold the end of the upper or needle thread when severed, a movable support or lever carrying a the said thread cutting and nipping device, means for operating the said thread cutting and nipping device, means for moving said movable support or lever so that said finger will be at one side of said needle-thread when the stitching commences and also during the general stitching operation,but will be moved to the other side of said throat for the last of a series of stiches, to enable the needle to carry its thread over said finger and will remain in the last-named position for the threadcutting operation, and means, acting through the upper needle-thread, for drawing up the lower thread into contact with said finger in position to be severed above the work.
29. In a sewing-machine, the combination with upper and lower thread carrying stitchforming devices and a plate'having a needlethroat, of a thread-cutting and thread-nipping device above but closely adjacent to said needle-throat and comprising suitable blades for severing both threads and a thread-finger above the work, and which thread-finger, in
cooperation with a blade, holds the end of the upper or needle thread when severed; a movable support carrying the said thread cutting and nipping device, a stop -motion device, means, controlled by said stop-motion device, for operating the .said thread-cutting device for closing the cutting and nipping device, means, independent of the said stop-motion device, for opening the cutting and. nipping device, and means for changing the position of the said movable support or lever to move the thread cutting and nipping device to opposite sides of the said needle-throat; so that the threads will be cut and the needle-thread nipped on one side of said throat and the said needle-thread will be subsequently released on the other side of said throat.
In testimony whereof I afiiix my signature in presence of two witnesses.
EDWARD B. ALLEN.
Witnesses:
HENRY J. MILLER, HENRY A. KORNEMANN.
US11147502A 1902-06-13 1902-06-13 Thread-cutting device for sewing-machines. Expired - Lifetime US735432A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440985A (en) * 1967-06-16 1969-04-29 Tokyo Juki Industrial Co Ltd Mechanism for cutting upper thread in a sewing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440985A (en) * 1967-06-16 1969-04-29 Tokyo Juki Industrial Co Ltd Mechanism for cutting upper thread in a sewing machine

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