US1139626A - Presser-foot mechanism. - Google Patents

Description

H. A BALLARD.

PRESSER FOOT MECHANISM.

APPUCATION man JAN. 2B. 1909.

191393626, Mmm May-15, 191.5.

2 SHEETS-SHEET 2.

- deze se eeieuui emee.

HARRIE A. BALLRI, EIBQSTDN, MASSACHUSETTS, ASSIGNOR TO THE yIBOYLSIION MFG. GMPMYY, OF SOUTH BOSTUN, MASSACHUSETTS, A 'COBEORATION OF NEW" erenssnsssoor MECHANISM.

urgeei eppcesioii ngusi el, 1912, Serial No. 331,529. Divided and. this application le January 28. 1389. Serial No. 474,670.

Be it known thai; l, Humain A. BALLARD, of Boston, in @ne county of Suolk `and Sule of lilessachusees, have invented ce1'- 4ifziin new sind useful `lmprevemenit-s in ,Presser-Fool; Mechanism, ef which the following is e specilicution.

This inventien relates 'lo shine-seeingA macliines snol more pariiculnrly to the threadclernping mechanism :und presserfoot mecha.- nisin'oi suoli machines, and the pres-ent ap plicution is s division of my epplicaion Serial No. 31,529, ile August .21, 1906, which resulbecl in U. S. LettersV Pai/eut i,098,8?=1. The presseroet es shown is non 'axially lielcl upon elle Werl; by lie force of e spring enel is lacked ancl'unloclred suitomuticslly and is automatically raised from the Work or released to permit feeding of 'the work. Tli'ebneeclle lireed is euometically clampeil end i'eleesefl at appropriate inervais. Mechanism is provided for euomniicullyunlocking and raising 'or releasing lie presserlieot and. for releasing #the needle tlireufi'l] et the 'saine 'lime when lie c power sliufof the machine is turned in the reverse direction, lo the enrl that tl'ie operalor muy quickly enfl easily remeve the forli from llieinachine when a sewing 'or Seeking speelse 'has been enigme, 'ne power :shaft is proviclerl wiih a na-ncl Wheel by vvluieli elle epcreior m25] menually guru ille slief in lie reverse direction when a sewing or stitching operation has been Enislsefi, io eiieci elle release ofi' the Work by lelle preeserfoot und to eiliect lhe release of the needle f lne forni in which che invention may be emboiiiecl is illustraierl upon lthe eccomifinjfing drewings and flescriloecl in the llowing specification.

0n the flrawings, Figure represents :i righi side elevaion of n shoe-sewing nu chine equipped with presseroo: mechaside.

nisin anni thread-clamping mechanism a1'- i'nnged and consii'uced in accordance with his invention. Fig, 2 iepresens a, vertical Seel-ion iiiu'ougli the liescl as seen from the left lined sifle. Fig. 3 represents an elevetion of n. fragment of the presserfoot' lockmeclmnism us seen from the righiJ hand Fig. 4 is e Seel/ion on line -i-i of 3. Fig. 5 is adetail of liliemechanism fer ucizusting ilie tliree clamp.

Specification of Letters Patent.

sents a carrier therefor.

formed in ille awl carrier. This connectie Patenied Maly i8, i915.

- sentially a head or frame 10, e cam sha-ft l1 journaled therein, and stitch-forming mechanism including an oscillatory needle 1.2, an evvl lf3, a Work rest 14, a looper for the needle thread, and a shuttle., noi shown, but presumably contained in u eesing i6.

17.. represents@ presserfoot and 18 repre- Tlie seid carrier is in the form of a lever, and its fulcruln is indicated et 19. The rear end ofthe lever 18 is eonnec'ced lo -one end of a spring 20 of which elle other end is connected to a suit# alole xture 21. The tension of the spring 20 is exerted at all times for the purpose of holding ithe presserfoot toward the work v resiI 14.- With which it coperatesto clamp the work inserted between them. The ewl 13 is cerri'ecl by nawl carrier 22 which is meunled upon e stud 23 about whicli'it. is adapted to oscillate in unison with `the needle. Tile awl earlier, however, receives 'medion eward and. from the needle for the purposeef eeing the Work, and orthis reason the stud 23 about 'which il, oscilletes is mountell in an arm 24 carried by ecm`- riage 25 arranged in suitable guides extendinglsterally or parallel lo elle axis of the stud .23., The means for reciprocal-ing the carriage 25 includes a leverv 26 mounted upon a. ulcrum 27 and having ai: one end' a roll 28 in coperaive engagemen'l with a Cain 29 on the Sheff'. ll. The needle 12 is afxeci to s needle carrier 30 which is mounted upon a stud, not slioivn, I about which it is aaptecl to oscilla-te. The means for actuating the needle carrier includes a crank Bl ou the shaft; ll. sind pinnen 32 connecting the crank with the neeolle c arrier. The axis about which the needle carrier moves is in A:ilinementwith that of the unl Carrier :1nd the tivo carriers are connecked so tha ilievinav lee oscillated in unison by 'the crank and pinnen., 'alflie means for connecting the two carriers -1s a form of pin nndvsloly connection, and .11n-

cludes ula'erally extending-pin ing from che needjle carrier into av slrollj provides for the independent lateral move 'j ment of the awl carrier for the purpose of Without affecting lthe ing the actuation of the stitch-forming mechanism. For this purpose, thel presserfoot lever 18 is provided with a pawl 36 which is adapted to coperate with a stationary ratchet 87 attached to the frame 10.

The relation of the pawl and ratchet with the presserfoot lever is such 4as to prevent movement of the presserfoot .away from the work rest.

Suitable means is provided for holding the pawl normally in engagement with the ratchet and vfor disengaging the paWl therefrom. According to the present invention this may be done in three ways. First by actuation of a handle 38, second, by means of a cam 39 mounted upon the shaft 11, and third, by means of manually reversing the 'direction of movement of the cam shaft.

The pavvl 36 is formed on one end of a member which is mounted upon two pivots 40 and 41. The pivot 40 is carried by a plunger 42 arranged so as to slide in guides formed on the lever 18. The pivot 41 connects the pawl member with one end of a rod 44 of which the other end is pivotally connected to the handle 38. A spring 45 connected tothe rod 44 and to the plunger 42 exerts its tension so as to hold the paWl normally in engagement with the ratchet. Whenthe handle 38 is moved tothe rear against the tension of the spring 45, it rst disengages the pawl from the ratchet and then engages a pin 46 on the lever 18 (see Fig. l) and by furtherl movement oscillates the lever about its fulcrum 19 thus retracting the presserfoot. The handle 88 is here shown as also mounted upon the fulcrum 19. I Q

The plunger 42 is provided with an ear 47 against which a spring 48 contained in a socket in the lever 18 exerts its tension for the purpose of pressing the point of the pawl toward the ratchet. Means-is provided, however, for automatically retracting the plunger 42 so as to disengage the pawl .from the ratchet prior to the feeding movement of the carriage 25. For this purpose, the plunger is provided with a pin 49 which is adapted to be engaged by an arm 50l secured upon one end of a rock shiaft 51 journaled in a bearing in the head 1 hold the presserfoot 'vided for in carrying out vention, and are #brought about by retract, presserfoot in still another`way. Before proceeding to the explanation of'. in which the presserfoot may r it will be necessary to de'-V fulcrum 19 when the A shaft 5l is also provided with an Y arm 52 on which is a roll 53 eccupyingthe cam groove 39. Oscillatory movement 1mparted tothe rock shaft 51 byl means of the cam causes the arm 50 tolpietract the plunger 42 and so release the paval i in which the pawl is disengaged'by movelment of the handle 38, the pvot 40 remains stationary and constitutes the fulcrum about 'which the pawl swings, while in the.

latter case in which the pawl-- is automati-f cally retracted, the pivot 41 rernalns stay `'1o. It will be noted that, in the rst instance tionary and constitutes the fulcrum during and the awl must be clear of thevvorli,n thepresserfoot 17 must be raised so aSO-,re-

lease the Work, and the needle "tl1regni,

which is indicated at a, shouldbegfree sof#- that the work may be removedbefore fthe,

thread is cut. These conditions are allp'ro the presentining the the third Way be retracted, scr1be the means herein shown for clamping the needle' thread at the proper intervals..V

during the operation ofthe stitch-forming mechanism.

Theneedle thread Lv-may be drawn from any suitable source of supply, the rear of the machine, and tension 54 and takeup rolls y before passing throughthe looper 15. These elements may be of any desired construction and arrangement, and are supplemented by a pair'of coperative clamping members 60 and 61 which are as usual for thepurpose of clamping the thread during the setting of a stitch. y shown as mounted upon theA presserfoot lever 18, one of said members being`in the form of form of passed over a a slide movable toward and from the roll, and adapted t0 enter the groove to bind the thread. The slide 61 is mounted in guides 62 and is reciprocated by meanspf an arm 63 with which it has a p in and slot connection, p the p' v.being indicated at' 64 the-Slot. at 65. curved so that it shall be concentric to th tion shown. This enables the arm 63 to maintain the Slide 6l in engagement With the roll 60 regardless of movement of the presserfoot lever about its fulcrum.

The arm 63 is affixed upon a rock shaft 77 which is journaled in a suitable bearing in the frame 10. 'Said rock shaft has a two arm lever 78 by which it may be actuated. One arm of the lever 78 extends downpreferably at arm 63 is in the posi- 55, 56 and 5'1"` The clamping members are here a grooved roll and the other in the The slot is prefer"lily:,.A`

Macnee wardly in the form of a. handle and is normally pressed in one direction by means of a spring 66 contained in a socket 79 formed upon the frame. The eect of the spring 66 is to force lever 7 8, rock Shaft 77, arm 63,

, and slide 6l so aS to bind the thread on the roll with a yielding tension which is removed only when the shaft T7 is rocked in opposition to the spring 66. For this purpose, the other armot the leve;l 7 8 is provided with ay roll 6T which occupiesla groove G8 formed in a cam member 69 on the shaft 11. The width of the groove'GS is greater than the diameter of the roll 6T and thus permits movement of the lever 7S independently of the member GS). The cam revolves in the direction 'indicated by vthe arrows in Figs. 1, 2 and 5, and is provided with inwardly projecting portions and 71 formed on the outer Wall of the groove 68. Although the spring 66 tends to force the roll 67 against the -outer wall oi"v the cam groove, the coperative engagement of the two clamping members 60 61 prevents contact with the outer wall at all points excepting the portions 70 and 71 which effect the retraction of the slideV 61 at the proper intervals. The function of the portion 70 is to release the needle thread at the time when a supply is being drawn for the succeeding stitch, and the function of the portion 71 is hereinafter explained.

Referring now to the third manner in which the presserfoot may be retracted, it Should be noted that the plungerl carries pivot stud 72 on which is mounted a linger J3.' .Aspring 74: (see Figs. 3 and 4) is connected to the pin 49 and to the pin extending from the finger 73, and normally exerts its tension so as to hold the free end et the finger in engagement with the periphery of a cam disk 75 mounted upon ,the shaft 11.

. The drawings illustrate theniachine in the f clamping members are in coperative enlocked by means of the pawl 36.

gageinent, and the presserfoot lever 18 is The sev-` eral actuating elements are so related and timed" that by turning the shaft- 11 backward through approximately one-eighth of a revolution, the awl may be retracted vfrom the work, the thread clamping members may be released and tlv.` presserfoot lever ma y be first released from the `atchet 37 and then rt rant-ed. lin the periphery o1" the cam disk Tf gainst which the finger 73 is normally l: recess the face 76 oi' which ahnte against the free end otthe finger 7?) .when theshaft is reversely rotated. Reverse rotation of the shaft thus-causes endwse movement of finger 73, and such movement causes the plunger l2 to slide in its guides 43 until the ear 17 strikes the lever 18. Further endivise movement of finger T3 is transmitted by the plunger 42 to the lever 18 to retract the presserf-oot from the work. The sliding movement ot' the plunger relatively tothe lever disengages the locking pawl 36 from the ratchet. 3T, thus unlocking the presserlfoot-lever preparatory to retractory move` ment of the latter. At the same time the port-ion T1 on the cam 69 engages the roll 67 and thereby rocks the shaft 77 so as to disengage the thread-clamping members, and the crank 3l on the shaft 11 is turned suiiiciently to retract the awl from the work. When the various parts are moved tothe positions described, the work is entirely free and may be readily removed So that the needle thread a may be conveniently severed.v v Having thus explained the nature of my said invention and described a Way of constructing andusing the same, although without attempting to set forth .all of the forms in which it may be made or all of the modes of its use, declare that what l claim is 1. In a machine' of the character described, a presserfoot carrier, a hand lever, said carrier being arranged to be movable independently of said hand lever and said hand lever being arranged to be movable independently of said presser-foot carrier, means arranged to lock said presserfo'ot carrier, and means arranged to be operated by said hand lever to move said locking means to unlock said carrier, said carrier having` an abutment arranged to be engaged by said hand lever to retract ysaid carrier.

2. In a machine of the character described, a shaft, a work support, a presserfoot, a carrier for said presser'oot, a spring arranged tocause said presserfoot to coact with saidavorlt support, means arrai'iged to l.loc-lv: said carrier, driven means arranged to act upon said locking means periodically to unlock said carrier when said machine is operating, a .rotary driven member, a movable member arranged tobe moved by said rotary driven member when said shaft is turned opposite to its operating direction,v

and means arranged to transnnt such movement'from said movable member to impart unlocking movement to said locking means and to impart ret-ractory movement to said carrier, said movable member being inefvfectual to operate said transmittingdmeans when said shaft is turning in said operating direction.

3. In a machine of the character referred to, complemental stitch-forming mechanism, a pressert'oot, a pressrloot-lever` a fulcrum for said lever, a stationary ratchet, springpressed pawl on said presserioot-lever for normally engaging said ratchet, 'automatic v engage said abutment means for periodically disengagng said paWl from said ratchet, and a thread-clamp in combination with .means on the main shaft for simultaneously unlocking and lifting the presserfoot and unlocking the thread-clamp upon a reverse movement of said shaft.

4. In a machine of the character de scribed, a presserfoot and lever therefor, a fulerum for said lever, normally coacting members for locking said lever, an abutment on said lever, a hand lever mounted on said fulcrum independently of said presserfoot lever, said hand lever being adapted to to move said presserfoot lever, and means operable by said hand lever for actuatingone of said locking members to unlock saidV presserfoot lever.

5. In a machine .of the character referred to, a shaft, stitch-forming mechanism driven thereby, a presserfoot, a presserfoot carrier, a fulcrum for said carrier, normally coacting ratchet and pawl members of which one is mounted on said carrier and the other on a fixture, and automatic means for periodically disengaging one of said coacting members from the other to unlock said carrier; in combination with a rotatable member having an operating surface, said member being driven by said shaft, andmeans adapted to be actuated by said surface, when the shaft is reversely rotated, to disengage one of said coacting locking members from the other and retract said presserfoot carrier. y

`6. In a machine of the character referred to, a shaft, stitelrforming mechanism driven thereby, a presserfoot, a presserfoot carrier, a fulcrum for said carrier, coacting ratchet and p'afwl members for locking said carrier, one of said locking members being mounted on said carrier and the other on a fixture, and one of them being spring-pressed into engagement with the other, automatic means for periodically disengaging one of said locking members from the other, and a thread clamp; in combination with means operative by reverse movement of said shaft for opening` said thread clamp, and means likewise operative by said shaft for disenga ging one of said locking members from the other and retractng said presserfoot carrier simultaneously with the aforesai action of said thread clamp.

7. A sewing machine having, in combination, a. rotary presserfoot structure, a spring arranged to act on said presser-foot structure to press the latter against the work, a pivoted member arranged to coact with said operating member, .a spring arranged to hold said pivoted member in position to coact with said operatingmember, said pivoted member being arranged to receive angular' movement about with said presser-foot,

operating member,a movableits ivot from said operating member when the atter is rotating in one direction, and to receive bodily movement from said operating member when the latter is rotating in the reverse direction, and means arranged to transmit such bodily movement of said pivoted member to said presserfoot structure to retract the latter.

8. Asewing machine having, .incombination', a drivmg'shaft, a work support, an arm bearing a'presser foot for holding the Work against thework support', `and means for moving the presser foot away 'from the work support inactive during the normal operation ofthe machine but acting when the machine .is turned backward including a link extending directly between the presser' foot arm and the driving shaft and reciprocated by the driving shaft only when it is rotated in the reverse direction.

9. In a sole-sewing machine, the combination with a drive shaft, a Work support, and a movable presser-foot, of a pivoted member, means connecting said pivoted member and operating means on said shaft constructed and arranged to move said pivoted member endwise upon reversal of said shaft, said connecting means being arranged to transmit such endwise movement to raisel said presser foot.

10. In a sole-sewing machine, the combination with a drive shaft, a work support, and a movable presser foot, of an arm pivoted on said presser-foot, and operating means on said shaft constructed and'arranged to 100 move said arm endwise upon reversal of said shaft to raise said presser-foot, said operating means swinging said arm on its pivot during the normal rotation of said shaft.

11. In a machine of the character described, a shaft, stitch-forming mechanism arranged to be operated by said shaft when rotating in one direction, a Work rest, a Work-engaging member arranged to coact with said work rest to clamp the work, and means arranged to be operated by said shaft when rotated in the reverse direction to retract said work-engaging member, said retracting means being arranged to be ineffeetive 'for the purposestated when said 4shaft is rotated in the first-mentioned dif .worloengaging member arranged to coact with .said work rest to clamp the work,

means arranged to locksaid member against 1125.

nnelamping movement,-and means arranged to be operated by said kshaft to unlock said locking means and retract said work-engagf ing member only when said vshaft is rotated in the reverse direction. 1an

13. In a machine of the character described,` a shaft,vstitchformin mechanism arranged yto be operated by sai shaft When rotating inone direction, Work-engaging scribed, a shaft, stitch-formingi means arranged to clamp the work, and

'means arranged to be operated by said shaftto act on said clamping means to release the Work only when said shaft is rotated in the reverse direction.

14. In a machine of the character demechanism arranged to be operated by sai shaft when rotating in one direction, thread-clamping i means arranged to be operated by said shaft to clamp and release the thread, work-en- -gaging means. arranged to clamp the work,

' and 'neans arranged to be operated by said l5. In afmaohine of the character described, a shaft, stitch-forming mechanism arranged to be operated by said shaft rotating in one direction; a presserfoot, and means arranged to be operated by said shaft to retract said presserfoot only when said shaft is rotated in the reverse direction;AI

16. In a machine of the character described, a shaft,'stitchformin mechanism arranged to be operated by sai shaft turning in 'one direction, a presserfoot, means arl ranged to lock said presserfoot, and means arranged to be operated by said shaft to. act

on/,said locking means to unlock said presserfoot only when said shaft is rotated in the reverse direction,

In testimony whereof I have aflixed my signature, in presence of two witnesses.

,HARRIE A. BALLARD.A Witnesses:

'GF/o. T. ARMSTRONG, M: E. CAPEN.

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