US2056759A - Buttonhole sewing machine - Google Patents

Buttonhole sewing machine Download PDF

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US2056759A
US2056759A US22970A US2297035A US2056759A US 2056759 A US2056759 A US 2056759A US 22970 A US22970 A US 22970A US 2297035 A US2297035 A US 2297035A US 2056759 A US2056759 A US 2056759A
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sewing machine
thread
allen
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US22970A
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Edward B Allen
Maurice D Knox
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Singer Co
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Singer Co
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/06—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for sewing buttonholes
    • D05B3/08—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for sewing buttonholes for buttonholes with eyelet ends
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • This invention relates to buttonhole sewing machines, more particularly of the automatic lock-stitch "straight type, commonly used for sewing buttonholes in white goods such as mens shirts, collars, cuffs and the like.
  • An object of the present invention is to provide an automatic straight buttonhole sewing machine, the various cooperative parts and devices of which are so improved and coordinated as to be commensurate in efliciency and speed with the rotary hook and bobbin-thread-handling mechanisms of said Patent No. 1,966,432, with which they are caused to work in harmony.
  • the invention further aims to provide the machine with improved thread-cutting mechanism and devices ancillary thereto.
  • the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.
  • Fig. 1 is a right side elevation, partly in section, of a button-hole sewing machine embodying the invention.
  • Fig. 2 is a left side elevation of the machine.
  • Fig. 2* is a similar view of the mechanism at the lower end of the tilting stop-motion lever for the sewing mechanism of the machine, showing such lever latched in its tilted or running position.
  • Fig. 3 is a bottom plan view of the machine.
  • Fig. 3*. is a detail bottom plan view of a part of Fig. 3.
  • Fig. 4 is a horizontal sectional view through the bracket-arm standard of the machine, showing the machine bed in plan.
  • Fig. 4 is a detail plan view of the stitch-gear adjusting bracket shown in Fig. 4.
  • Fig. 1 is a right side elevation, partly in section, of a button-hole sewing machine embodying the invention.
  • Fig. 2 is a left side elevation of the machine.
  • Fig. 2* is a similar view of the mechanism at the
  • Fig. 4 is a section on the line 9-4
  • Fig. 5 is a rear end elevation of the machine.
  • Fig. 5 is a disassembled perspective view of a connection between the top of the sewing stop-motion lever and a latch-tripping rod for the upper threadcutter and -nipper release mechanism.
  • Fig. 6 is a face view of the sewing stop-motion buffer spring and its carrier.
  • Fig. 7 is a perspective view of the notched stop-cam of the sewing stop-motion device.
  • Fig. 8 is a front end elevation of the machine.
  • Fig. 9 is a vertical section through the pendulous needle-bar carrier or gate.
  • Figs. 10 and 11 are respectively enlarged face and vertical sectional views of the needle-thread tension device shown at the lower end of the bracket-arm head in Fig. 8.
  • Fig. 12 is a horizontal sectional view through the overhanging bracket-arm of the machine.
  • Fig. 13 is a section on the line l3-l3, Fig. 1.
  • Fig. 14 is a section on the line H-H, Fig. 13.
  • Fig. 15 is a perspective view of the actuating cam of the upper thread-cutter and -nipper release mechanism.
  • Fig. 16 is a plan view of the forward end portion of the machine bed with the work-clamp removed.
  • FIG. 17 is a vertical section through the machine bed and bracket-arm standard on the line lI-I'l, Fig. 1.
  • Fig. 18 is a section on the line Iii-l8, Fig. 1.
  • Fig. 19 is a disassembled elevation of certain small parts shown in Fig. 16.
  • Fig. 20 is a left side elevation, partly in section, of the connections with feed-cam for imparting to the work-clamp its travelling movements lengthwise of the machine bed.
  • Fig. 21 is a section on the line 2 l2i
  • Fig. 16 is a horizontal section on the line 22-22, Fig. 1, but on a larger scale.
  • Fig. 23 is a section on the line 23-23, Fig. 22.
  • Fig. 24 is a perspective view of the inner face of the needle-bar-vibrating crank-head shown in Figs. 22 and 23.
  • Fig. 25 is a bottom face view of the feed-cam.
  • Fig. 26 is aperspective view of the cam which controls the field or center line of vibration of the needle.
  • Fig. 27 is a transverse vertical section through the machine bed on the line 21-21, Fig. 4.
  • Fig. 30 is a fragmentary vertical section on the line 30-30, Fig. 1.
  • Fig. 3 1 is a longitudinal vertical section through the forward end-portion of the needle-throat-plate of the machine, showing the under nipper for the needle-thread; the nip per being open or in position to receive the needle on its first descent in the sewing of a buttonhole.
  • Fig. 31 is a similar view showing the nipper closed on the beginning end of the needle-thread after the needle has risen clear of the work and the take-up lever has reached the top of its first up-stroke.
  • Fig. 32 is a transverse section through the throat-plate on the line 32-42, Fig. 31. Fig.
  • Fig. 33 is a section substantially on the line section longitudinally oi the machine bed at the rearward end thereof adjacent the bracket-arm standard on the line 34-34, Fig. 3.
  • Fig. 35 is a similar sectional view on the line 35-45, Fig. 3.
  • Fig. 36 is a horizontal sectional view through the one-rotation clutch mechanism for driving the auxiliary shaft of the machine which drives the work-clamp closing and opening mechanism the buttonhole-cutting mechanism and various other mechanisms auxiliary to the stitch-forming mechanism in the buttonhole producing cycle.
  • Fig. 37 is a face view of the driven or bottom element of the clutch shown in Fig. 36.
  • Fig. 38 is a face view of the live or top clutch-element shown in Fig. 36.
  • Fig. 39 is a perspective view of the clutch-controlling gate.
  • Fig. 40 is a disassembled perspective view of parts of the driven clutch-element.
  • Fig. 41 is a longitudinal vertical sectional view through the work-clamp, showing the operating mechanism for the upper thread-cutter and -nipper.
  • Fig. 42 is a section on the line 42-42, Fig. 41.
  • Fig. 43 is a section on the line 43-43, Fig. 42.
  • Fig. 44 is a section on the line 46-, Fig. 2.
  • Fig. 45 is a section on the line 45-45, Fig. 44.
  • Figs. 46, 47 and 48 are, respectively, transverse vertical sectional views on the lines 46-46, 41-41 and 46-48, Fig. 16.
  • Fig. 49 is a sectional view on the line 49-46, Fig. 16.
  • Fig. 50 is a vertical sectional view through the front hook-shaft bearing showing the bobbinthread pull-off driving connections.
  • Fig. 51 is a fragmentary left side elevational view of the clamp closing-and-opening and buttonhole-cutting mechanisms.
  • Fig. 51 is a sectional view of the element of Fig. 51.
  • Fig. 52 is a top plan view of the rotary hook and bobbin-thread pullofl devices.
  • Fig. 53 is a fragmentary right side elevation of the needle, rotary hook and bobbinthread pull-oi! devices.
  • Fig. 54 is a perspective view of the bobbin-thread-nipper and -cutter.
  • Fig. 55 is a perspective view of the latch which controls the opening and closing movements of the bobbin-thread-nipper and -cutter.
  • Figs 56 and 56" are, respectively, top and bottom perspective views of the throat-plate.
  • Fig. 57 is a disassembled perspective view of the under n'eedle-thread-"nipper.
  • Fig. 58 is a top plan view of the bobbin-thread-nipper and -cutter advancing and opening to seize and cut the bobbinthread at the end of a sewing period.
  • Fig. 59 is a front elevation, partly in section, of the parts shown in Fig. 58.
  • Fig. 60 is a view similar to Fig. 58 with the bobbin-thread-cutter and -nipper almost fully advanced and about to close upon the bobbinthread.
  • Fig. 61 is a front elevation, partly in section, of the parts shown in Fig. 60.
  • Fig. 62 shows the bobbin-thread-cutter and -nipper fully advanced and closed upon the bobbin-thread.
  • Fig. 63 is a front elevation, partly in section, of the parts shown in Fig. 62.
  • Fig. 64 shows the closed bobbin-thread-nipper and -cutter, fully retracted to pull off a measured length of bobbinthread for the beginning of the next sewing operation.
  • Fig. 61 is a front elevation, partly in section, of the parts shown in Fig. 60.
  • Fig. 62 shows the bobbin-thread-cutter and -nipper fully advanced and closed upon the bobbin-thread.
  • Fig. 65 is a front elevation, partly in section, of the parts shown in Fig. 64, the bobbinthread-cutter and -ni.pper being also shown in dotted lines in its subsequently partially advanced position to slacken the bobbin-thread so that it may be easily pulled to position in the work by the first needle-loop to be tightened in the next sewing operation.
  • Fig. 66 is a transverse section through the bobbin-thread-cutter and 33-43, Fig. 4.
  • Fig. 34 is a fragmentary vertical -nipper.
  • the machine frame comprises a box-like bed or casing I on top of which is secured the standand 2 of the overhanging bracket-arm I tenninating in the head 4.
  • the space above the bed I and under the overhanging portion of the bracket-arm I constitutes a work-receiving throat and it is within this throat that the workclamp of the machine is customarily mounted for step-by-step travelling movements longitudinally of the bed I to distribute the stitches lengthwise of the buttonhole being produced.
  • the present work-clamp is so constructed that almost the entire depth of the throat of the frame is available for reception of work and the machine is thus well adapted for sewing buttonholes in shirt bosoms.
  • the standard and bracket-arm have open sides and coplanar inner vertical webs 2', 3, the open sides being closed by removable cover-plates 3 and 3'', Fig. 17.
  • the main sewing shaft 5 of the machine is journaled in the bracket-arm I and at its forward end carries the usual crank 6 connected by the link I to the reciprocatory needle-bar I carrying the eye-pointed needle 9.
  • the needle-bar 8 is mounted for endwise reciprocation in the pendulous carrier or gate I0, Figs. 8 and 9, suspended from the pivot II and vibrated transdescribed.
  • a bevelgear I2 which meshes with the bevelgear I2 fixed to the vertical shaft II to the lower end of which is fixed the bevel-gear I4 meshing with the bevel-gear II on the lower horizontal shaft I6 carrying at its forward end the rotary hook I! which cooperates with the needle 9 to form stitches.
  • the rotary hook I'I embraces the stationary bobbin-case I6 which is journaled within it and is restrained against rotation by the independently oscillatory fingers I9, 26, Fig. 8,'received in the notches 2
  • the bobbincase I8 carries the usual bobbin 2! of under thread.
  • the fingers I9, III are carried by the respective parallel rock-shafts 23, 24 which are oscillated one at a time, to clear the bobbin-case in the loop-casting operation, by the respective cam-followers 26. 26 in engagement with the respective cams 21, 26 on the cam-shaft 29 connected by gears 30 to the hook-shaft l6 to run at half the speed of the latter.
  • the present rotary hook and bobbin-case devices, as well as the cammechanism for operating the openable rotationrestraining fingers I 8, 20 are constructed substantially in accordance with the disclosure of said U. 8. Patent No. 1,966,432. While any of the usual loop-taking mechanisms may be used, the particular loop-taking mechanism disclosed is preferred because of the extreme ease and freedom with which the needle-loops are passed thereby around the bobbin-case at high operative speeds.
  • the vertical sewing shaft II, Fig. 18, carries a pinion 3

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

Description

Oct. 6, 1936. E. B. ALLEN Er AL BUTTONHOLE SEWING MACHINE O R n m 0 e H W R HA0 m kw m A v r r a 2 m 8 w SW W Wm 4 3Q a H. irlwL w h 1 h mm m Original Filed Dec.
Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 18 Sheets-Sheet 2 IN VEN T0 R5 gdww-d 13. Allen aeaz'ese 17. liizaz:
ATTORNEY BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Shets-Sheet 3 INVENTORS Edward 5. Allen am BY Mawzwe IQ/ 220x A TTORNEY Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec.
26, 1934 18 Sheets-Sheet 4 I N V EN TORS E'dward 15. AZlen/ an BY Vg Maul we 3. Know A TTORN E Y Oct. 6, 1936. E. B. ALLEN El AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed DEC. 26, 1934 18 Sheets-Sheet 5 INVENTORS Edward B.Al6en/ A TTORNEY Oct. 6, 1936. E. B. ALLEN El AL BUTTONHOLE SEWING MACHINE Original Filed Deb.
26, 1934 18 Sheets-Sheet 6 I N V EN TORS Edward 51 Allen 7 aurz'ce fiJYnoa:
A TORNE Y Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 7 m 8% @Qm W W \Qm; MN ms 5w W Nm w bx EN w A U, %-N GM. v 8% a MM as m %.w 3 m m INVENTORS x no 3 V UN 5 m am A r /W d Mm 1936. E. B. ALLEN ET AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 8 Edwwz and A TTORNEY Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 9 V ll 1NVENTORS and Edwaa 'd 5.1156370 BY A TTORNEY Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet l0 w mm? W T a i W 5 a. -i I wm m M W1,
mm mm N h II r 4%. w I .T. Q. 4 R ww Oct. 6, 1936. E. B. ALLEN El AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26; 1954 1a Sheets-Sheet 11 339 Fr- W 4/330 24.9 gag /5 ATTORNEY I Oct. 6, 1936. B ALLEN 17] AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26., 1934 18 Sheets-Sheet 12 Z9-9-m 1N VEN TORS l'dwmd 5.116600 8'; May/rice flEnow A TTORNEY 1936- E. B. ALLEN El AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet l3 INVENTORS Edward B.Alle1o Maurice 0.10m
and
A TTORNEY Oct. 6, 1936. E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet l4 IN V EN TORS J Edward 5.Allen an awra'ce JD. Know A TTORNEY E. B. ALLEN ET AL BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 15 "ulll alu ;ill in"!!! iii Oct. 6, 1936.
w m m m Edward fidlllen/ 5;: awrb'ce QKnoa;
ATTORNE Oct. 6, 1936. E. B. ALLEN m- AL 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 16 I N VEN TORS dE'tZll/Ltld .B. Alen/ an azu-ce 0.1mm BY A TTORNEY Oct. 6, 1936. ALLEN ET AL 2,056,759-
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 17 Arroza vgy Oct. 6, E ALLEN ET A 2,056,759
BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet 18 A TTORNEY Patented Oct. 6, 1936 UNITED, STATES PATENT OFFICE BUTTONHOLE SEWING MACHINE Edward B. Allen and Maurice D. Knox, Newtown. Conn., assignors to The Singer Manufacturing Company, Elizabeth, N. 1., a corporation of New Jersey 9 Claims.
This invention relates to buttonhole sewing machines, more particularly of the automatic lock-stitch "straight type, commonly used for sewing buttonholes in white goods such as mens shirts, collars, cuffs and the like.
In United States Patent No. 1,966,432, of July 17, 1934, there is disclosed rotary-hook lockstitch mechanism capable of so handling the needle-thread loops and bobbin-thread that pyramid purl buttonholes may be accurately sewn at rates as high as 3000 stitches per minute.
An object of the present invention is to provide an automatic straight buttonhole sewing machine, the various cooperative parts and devices of which are so improved and coordinated as to be commensurate in efliciency and speed with the rotary hook and bobbin-thread-handling mechanisms of said Patent No. 1,966,432, with which they are caused to work in harmony.
The invention further aims to provide the machine with improved thread-cutting mechanism and devices ancillary thereto.
With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.
The present application is a division of our copending application Serial No. 759,200, filed Dec. 26, 1934.
In the accompanying drawings, Fig. 1 is a right side elevation, partly in section, of a button-hole sewing machine embodying the invention. Fig. 2 is a left side elevation of the machine. Fig. 2* is a similar view of the mechanism at the lower end of the tilting stop-motion lever for the sewing mechanism of the machine, showing such lever latched in its tilted or running position. Fig. 3 is a bottom plan view of the machine. Fig. 3*.is a detail bottom plan view of a part of Fig. 3. Fig. 4 is a horizontal sectional view through the bracket-arm standard of the machine, showing the machine bed in plan. Fig. 4 is a detail plan view of the stitch-gear adjusting bracket shown in Fig. 4. Fig. 4 is a section on the line 9-4, Fig. 4 Fig. 5 is a rear end elevation of the machine. Fig. 5 is a disassembled perspective view of a connection between the top of the sewing stop-motion lever and a latch-tripping rod for the upper threadcutter and -nipper release mechanism. Fig. 5
is a detail sectional view of an element of Fig. 5. Fig. 6 is a face view of the sewing stop-motion buffer spring and its carrier. Fig. 7 is a perspective view of the notched stop-cam of the sewing stop-motion device. Fig. 8 is a front end elevation of the machine. Fig. 9 is a vertical section through the pendulous needle-bar carrier or gate.
Figs. 10 and 11 are respectively enlarged face and vertical sectional views of the needle-thread tension device shown at the lower end of the bracket-arm head in Fig. 8. Fig. 12 is a horizontal sectional view through the overhanging bracket-arm of the machine. Fig. 13 is a section on the line l3-l3, Fig. 1. Fig. 14 is a section on the line H-H, Fig. 13. Fig. 15 is a perspective view of the actuating cam of the upper thread-cutter and -nipper release mechanism. Fig. 16 is a plan view of the forward end portion of the machine bed with the work-clamp removed. Fig. 17 is a vertical section through the machine bed and bracket-arm standard on the line lI-I'l, Fig. 1. Fig. 18 is a section on the line Iii-l8, Fig. 1. Fig. 19 is a disassembled elevation of certain small parts shown in Fig. 16.
Fig. 20 is a left side elevation, partly in section, of the connections with feed-cam for imparting to the work-clamp its travelling movements lengthwise of the machine bed. Fig. 21 is a section on the line 2 l2i, Fig. 16. Fig. 22 is a horizontal section on the line 22-22, Fig. 1, but on a larger scale. Fig. 23 is a section on the line 23-23, Fig. 22. Fig. 24 is a perspective view of the inner face of the needle-bar-vibrating crank-head shown in Figs. 22 and 23. Fig. 25 is a bottom face view of the feed-cam. Fig. 26 is aperspective view of the cam which controls the field or center line of vibration of the needle. Fig. 27 is a transverse vertical section through the machine bed on the line 21-21, Fig. 4. Fig. 28 is a section on the line 28-28, Fig. 16, Fig. 29 is a section on the line 29-29, Fig. 3.
Fig. 30 is a fragmentary vertical section on the line 30-30, Fig. 1. Fig. 3 1 is a longitudinal vertical section through the forward end-portion of the needle-throat-plate of the machine, showing the under nipper for the needle-thread; the nip per being open or in position to receive the needle on its first descent in the sewing of a buttonhole. Fig. 31 is a similar view showing the nipper closed on the beginning end of the needle-thread after the needle has risen clear of the work and the take-up lever has reached the top of its first up-stroke. Fig. 32 is a transverse section through the throat-plate on the line 32-42, Fig. 31. Fig. 33 is a section substantially on the line section longitudinally oi the machine bed at the rearward end thereof adjacent the bracket-arm standard on the line 34-34, Fig. 3. Fig. 35 is a similar sectional view on the line 35-45, Fig. 3. Fig. 36 is a horizontal sectional view through the one-rotation clutch mechanism for driving the auxiliary shaft of the machine which drives the work-clamp closing and opening mechanism the buttonhole-cutting mechanism and various other mechanisms auxiliary to the stitch-forming mechanism in the buttonhole producing cycle. Fig. 37 is a face view of the driven or bottom element of the clutch shown in Fig. 36. Fig. 38 is a face view of the live or top clutch-element shown in Fig. 36. Fig. 39 is a perspective view of the clutch-controlling gate.
Fig. 40 is a disassembled perspective view of parts of the driven clutch-element. Fig. 41 is a longitudinal vertical sectional view through the work-clamp, showing the operating mechanism for the upper thread-cutter and -nipper. Fig. 42 is a section on the line 42-42, Fig. 41. Fig. 43 is a section on the line 43-43, Fig. 42. Fig. 44 is a section on the line 46-, Fig. 2. Fig. 45 is a section on the line 45-45, Fig. 44. Figs. 46, 47 and 48 are, respectively, transverse vertical sectional views on the lines 46-46, 41-41 and 46-48, Fig. 16. Fig. 49 is a sectional view on the line 49-46, Fig. 16.
Fig. 50 is a vertical sectional view through the front hook-shaft bearing showing the bobbinthread pull-off driving connections. Fig. 51 is a fragmentary left side elevational view of the clamp closing-and-opening and buttonhole-cutting mechanisms. Fig. 51 is a sectional view of the element of Fig. 51. Fig. 52 is a top plan view of the rotary hook and bobbin-thread pullofl devices. Fig. 53 is a fragmentary right side elevation of the needle, rotary hook and bobbinthread pull-oi! devices. Fig. 54 is a perspective view of the bobbin-thread-nipper and -cutter. Fig. 55 is a perspective view of the latch which controls the opening and closing movements of the bobbin-thread-nipper and -cutter. Figs 56 and 56" are, respectively, top and bottom perspective views of the throat-plate. Fig. 57 is a disassembled perspective view of the under n'eedle-thread-"nipper. Fig. 58 is a top plan view of the bobbin-thread-nipper and -cutter advancing and opening to seize and cut the bobbinthread at the end of a sewing period. Fig. 59 is a front elevation, partly in section, of the parts shown in Fig. 58.
Fig. 60 is a view similar to Fig. 58 with the bobbin-thread-cutter and -nipper almost fully advanced and about to close upon the bobbinthread. Fig. 61 is a front elevation, partly in section, of the parts shown in Fig. 60. Fig. 62 shows the bobbin-thread-cutter and -nipper fully advanced and closed upon the bobbin-thread. Fig. 63 is a front elevation, partly in section, of the parts shown in Fig. 62. Fig. 64 shows the closed bobbin-thread-nipper and -cutter, fully retracted to pull off a measured length of bobbinthread for the beginning of the next sewing operation. Fig. 65 is a front elevation, partly in section, of the parts shown in Fig. 64, the bobbinthread-cutter and -ni.pper being also shown in dotted lines in its subsequently partially advanced position to slacken the bobbin-thread so that it may be easily pulled to position in the work by the first needle-loop to be tightened in the next sewing operation. Fig. 66 is a transverse section through the bobbin-thread-cutter and 33-43, Fig. 4. Fig. 34 is a fragmentary vertical -nipper. Fig. 67 shows the parts of the needle- 7 thread-controlling mechanism at the end of a The machine frame comprises a box-like bed or casing I on top of which is secured the standand 2 of the overhanging bracket-arm I tenninating in the head 4. The space above the bed I and under the overhanging portion of the bracket-arm I constitutes a work-receiving throat and it is within this throat that the workclamp of the machine is customarily mounted for step-by-step travelling movements longitudinally of the bed I to distribute the stitches lengthwise of the buttonhole being produced. The present work-clamp is so constructed that almost the entire depth of the throat of the frame is available for reception of work and the machine is thus well adapted for sewing buttonholes in shirt bosoms. The standard and bracket-arm have open sides and coplanar inner vertical webs 2', 3, the open sides being closed by removable cover-plates 3 and 3'', Fig. 17.
Stitch donning mechanism The main sewing shaft 5 of the machine is journaled in the bracket-arm I and at its forward end carries the usual crank 6 connected by the link I to the reciprocatory needle-bar I carrying the eye-pointed needle 9. The needle-bar 8 is mounted for endwise reciprocation in the pendulous carrier or gate I0, Figs. 8 and 9, suspended from the pivot II and vibrated transdescribed.
Mounted on the main sewing shaft 5 is a bevelgear I2, Fig. 1, which meshes with the bevelgear I2 fixed to the vertical shaft II to the lower end of which is fixed the bevel-gear I4 meshing with the bevel-gear II on the lower horizontal shaft I6 carrying at its forward end the rotary hook I! which cooperates with the needle 9 to form stitches.
The rotary hook I'I embraces the stationary bobbin-case I6 which is journaled within it and is restrained against rotation by the independently oscillatory fingers I9, 26, Fig. 8,'received in the notches 2|, in the thread-case. The bobbincase I8 carries the usual bobbin 2! of under thread. The fingers I9, III are carried by the respective parallel rock- shafts 23, 24 which are oscillated one at a time, to clear the bobbin-case in the loop-casting operation, by the respective cam-followers 26. 26 in engagement with the respective cams 21, 26 on the cam-shaft 29 connected by gears 30 to the hook-shaft l6 to run at half the speed of the latter. The present rotary hook and bobbin-case devices, as well as the cammechanism for operating the openable rotationrestraining fingers I 8, 20 are constructed substantially in accordance with the disclosure of said U. 8. Patent No. 1,966,432. While any of the usual loop-taking mechanisms may be used, the particular loop-taking mechanism disclosed is preferred because of the extreme ease and freedom with which the needle-loops are passed thereby around the bobbin-case at high operative speeds.
The vertical sewing shaft II, Fig. 18, carries a pinion 3| which drives the gear 32 on the short vertical shaft 33 to the lower end of which is fixed the head 34 carrying the diametrically opposed
US22970A 1934-12-26 1935-05-23 Buttonhole sewing machine Expired - Lifetime US2056759A (en)

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US759200A US2056758A (en) 1934-12-26 1934-12-26 Buttonhole sewing machine
US22970A US2056759A (en) 1934-12-26 1935-05-23 Buttonhole sewing machine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431292A (en) * 1944-09-04 1947-11-18 Singer Mfg Co Hook lubrication for sewing machines
WO2014171846A1 (en) 2013-04-15 2014-10-23 Koryazova Irina Lvovna Method for preserving ovulated sturgeon roe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431292A (en) * 1944-09-04 1947-11-18 Singer Mfg Co Hook lubrication for sewing machines
WO2014171846A1 (en) 2013-04-15 2014-10-23 Koryazova Irina Lvovna Method for preserving ovulated sturgeon roe

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