US2265553A - Pinking mechanism - Google Patents

Description

Dec. 9, 1941. W, N, SOBEL E11-AL n 2,265,553

PINKING MECHANISM Filed Feb. l, 1.959 i 2 Shees-Sheet l w/TNESS Br mdf/(4 v .Av-T0 NEY w. N. soBEl. ET AL 1 2,265,553

PINKING MEGHANISM Filed Feb. 1, 1939 2 Sheets-Sheet 2 '/NVENTQRS l Bjrv" Patented Dec. 9, 1941 PINKING MECHANISM William N. Sobel and Herbert V. Jacobs,

Philadelphia, Pa.

Application February 1, 1939,v Serial No. 253,984

8 Claims.

The invention relates to pinking mechanism and involves improved means for rendering such mechanism operative and inoperative at will and positioning the movable cutter blade into and out of cooperative relation with the stationary cutter blade without interrupting or interferring with the usual stitching operation of the sewing maychine with'which the improvement is used. The

inventionA has to do particularly with pinking mechanism of the type wherein a stationary cutter orl ledger blade is positioned adjacent the stitching mechanism of the sewing machine, and the movable cutter blade is reciprocated relatively to the stationary cutter blade by means of 4a pitman structure which receives its reciprocating motion from the driving mechanism of the sewing machine.

In isome of the pi 'ng devices heretofore used lin combination with sewing machines, no means have been provided forV discontinuing the pinking operation at the will of the operator. It is frequently desirable or necessary in a combined stitching and pinking operation to discontinue the pinking operation during certain portions of the stitchingl operation. In structures where no means are provided for throwing the pinking device into and out of operation at will, it is necessary to remove the work from the combined stitching and pinking machine so that the stitching .operation alone can be carried out on an independent machine not equipped with a pinking device. The use of separate .machines in this manner is troublesome and expensive.

vIn attempting to overcome the diiculties inherent in machines of the type referred to, manual means have heretofore been provided for operatively disconnecting the pinking device from the driving mechanism of the sewing machine. vSuch means have not been satisfactory in operation, and so far as we are aware no means has been provided heretofore for operatively connecting and disconnecting the pinking device from 'the driving mechanism of the sewing machine where a pitinan structure or the like is employed gior positively transmitting motion in both directions from the driving mechanism of the sewing machine to the movable cutter of the pinking device.

The principal object of the present improvement is the provision of a simple coupling device in themotion transmitting means between sewing machine driving mechanism and a pinking attachment whereby the movable cutter blade of lthe pinking device maybe thrown into and out of operation at will, without interfering with the stitching operation performed by the sewing machine. Other objects and advantages of the improvement will be apparent from the following description, taken with the accompanying drawings wherein:

Fig. 1 is a front elevational view of a sewing machine with our improved pinking device attached thereto, the movable cutter blade and associated parts being shown in their uppermost position when in use and our improved coupling member being shown inoperative condition;

Fig. 2 is an end elevational view, partly cut away, showing our improved coupling device with `the parts thereof in position to transmit motion from the driving mechanism of the sewing machine to the movable cutter blade of the pinking device;

Fig. 3 is a similar view showing the coupling device with the parts disconnected; and

Fig. 4 is a rear elevational View of the pinking device with the movable cutter blade and associated parts in their lowermost position of use.

The invention is illustrated in the drawings in combination with a sewing machine provided with the usual bed plate or work support I0, a standard II projecting upwardly from one end thereof and having an overhanging arm I2 extending from its upper end over the bed plate, and provided with the usual head I3 on its outer end. Power from an electric motor or other suitable source is applied to the sewing machine by means of a belt passing over a `driving pulley I4 securedon the outer end of the main drive shaft I5. Suitable motion transmitting means on the `opposite end of the drive shaft I5 serves to reciprocate the needle bar I6 within the head I3, together with the needle I1 carried thereby. The Work is held in place yon the work support IIl by a presser foot I8 carried by the lower end of a manually operable presser bar I9 supported in the head I3. The stitching operation is performed by the reciprocating needle I'I, in cooperation with any known `form of feed mechanism and loop-forming mechanism positioned beneath the bed plate I0.

As illustrated in the drawings, our improvementvis incorporated in a pinking device having a stationary cutter or ledger blade 20 positioned adjacent the stitch-forming mechanism, and a reciprocating cutter 2I receiving its motion from the drive shaft I5 of the sewing machine. The pinking attachment is mounted upon a base 22' which is adjustably secured to the bed plate I0 by suitable means such as a set screw 23. The

the sewing -machine cross section, and is removably secured to the' lower end of a cutter arm by means of aset screw 26. At its upper end the cutter arm '25 'is pivoted on a pin 21 in the outer'engil',oiv agen-tiger Y supporting arm 28, the opposite end of whichzis pivoted at 29 to the base 22. Illimanioyablecutter 2i is resiliently urged into cooperative engagement with the cutting edges on the lcdgerblade' v2,0 by anadjustable .spring device com prisinJg a flink member i3d, -a-be'll :crank 31 pivoted on a screw 532- extending transversely :through Ithe "cutter, supporting arm 28,y and a coiled fspring'f-313 liavinglfone endr secured -to vrthe 'bell 1crank"3l and 'itsfother end secured to dthe inner end vof ajpin 34v extending outwardly through one Aend of the cutter supporting armff28 andthreaded :on its In-pinkin-g mechanism -of the generaltypefto which'fourgijmprovement'is applied, it is essential thatthe `movable vcutter be reciprocatedin -timed relation vwith ithe `stitching mechanism i of t Y and the `feed mechanism ou-terend toreceive--afmanuallyoperable adjustemployed therewith. ment Lthe reciproca-ting `I notion of the movable cutter-Mis obtained from the drive shaft li'by means of reduction gearing, ofwhich one ele- 'm'entSB isjsecu-red vto the drive shaft "l5 and 'thek other, 37 is secured tothe end` of' a 4j ack shaft k$8 supported in suitable nbearings in ,a bracket 'suspended ffromvthe overhanging arm i2. The -gearreduction isfordinarilypa two-to-one ratio, "thusjprovijding'onereciprocation ofY the movable "cutteril Aforevery Atwo Vreciprocations vof :the needle barslr 1 Y t, v Y Y -'-The end of the jack shaft oppositegear royided with a head4'0 Ahav-inga wristopin ^4`l securedjthereinp A ball head-42' onthecouterend of 'the `wrist pin '4|' engages within a bal'lsocket fini-the *head *'43 of Va pitman structure which transmits motion -tothe cutter-supporting arm 26. 'Apitman rod 44 extends downwardly from bthe pitmanfheadinto" a socket J45 formed' in a couplingmember J46. Aj ball socket onthe'iower "endoV of coupling ,4 6 receives av ba1lhead'4`flv on 'the f'I'n :the` present irriprove- CII jouter'endloij Ia pin`48 threaded into alug49 which Y iprojectsjupwardly from the cutter supporting amrZ.

A, Thepitman .rod ,44 Vis `*freely'sli'da'ble in the socket^45, and the "means, which we have pro; 'vided for releasably connecting therod '44 and `Ithe-coupling member 46 together comprises'a jyoke''ll the side arms5l of which are pivoted to thecoupling member-"46 'by screws 52.' Y'I'hevloop portion 53 of the yoke may becut away as .shown at1541towpartly -encircle the pitmanjro'd 44 and. ,engage within ja notch "55' arranged 'transversely therein; fThefree end of 'the yoke 50'is"urged -toward'the pitman rod '44bymeans of a `coiled sprnghaving one yoke and'itspposite'end `'.in contact withja curi/esi aloutment 154 zpreiecting' 'outwardly 'from iheigourling msmbcri- :LAS 'will be. apparent from the drawings, when" the loop'portion owf'the end in tContactwitn'the Y yoke is in engagement with the notch 55, the pitman rod 44 and the coupling member 46 will be connected together so that the reciprocating motion of the pitman rod will be transmitted through the coupling member 46, theY cutter supporting arm 28 and the cutter arm 25 to the movable cutter 2 l. When, however, the loop portion of the yoke isl out of engagement with the notch 155, the pitman rod gisvfree to reciprocate in the socket (45 Without imovngftlae coupling member 46 therewith.

In order to disengage the yoke from the notch 55, .Wehave provided a manually operated lever "57 straddling the coupling member 46 and pivoted therepnaby Screws 58.

Tziszarranged to be moved upwardly to disconneet the coupling member from the pitman rod, and 'tobe moved downwardly for the purpose of freeinghe yoke to connect the coupling member with the pitman rod. As will be clear rom "Figs, h2 fand "13A of the rdrawings,fthe -arms of the with a' nosef on-the lever-f5 'lftofretainftheyoke :intits'inoperative position `whenl the lfree end of l'lever --isgingits rai-sed (position. 'Itwill =be apparent Vthat the direction of movement of 4tljie lan-d V-lever 57 -'-to disconnect coupling 4merri- V'ber from 1,the pitmanrod -ythedirectionc fmovementiof themovablecutterwhen itiswinoved out ofpingli-ngoperation. v1Movelnentof-j,he-lever downwardly serves -to `release I-theycke for engagement Y with A-the1notch 55 and `thereby openlatively connect the coupling member to the pit- Vrnanrod. -hisfdownwardgmovementcf the'ihand lever 'is in the same direction fin-.which -ithee'mov- *able cutter moves from inoperative to operati-ve position, This arrangement of the ylever-has been found advantageous to fthe -cperatcr -of--the Virren-brinel inasmuch fasth-e directionbmovement of the flever `-is-al-ways',indicative of I the -dircction inwhich it is desired to move-thegmovablecutter both into and ou-tof Jop'erating-posi-tions.

Whilethe structurejheietcfore-aiescribedeis--one in which-thecutter supportingarmzeisaositiveiy reciprocated Yboth direci'ions when Lthe-cou#- pling-membegr l'i6 is operatively connected to 4the tpitman rod 454, additional vmeans "have been provided inthe form/of a-spiralspring-E-I for-raising the movable cutter Vout Iof -coop'erativefengage- Vment withthesta'tionaryfcutterj-Z when'theccu- 4iol-ing"inemiie-r is` 'disconnected from the v^p`ii'frnagri rod. `-"ihedower end ofthe s pringGl-'issupported upon the base' and-its' uppery end-engagesawith the freefendof the cutter supporting armi-28. The swinging movement; of @the cutterfsupporting-arm 2-8 upwardly CJis -llifmited Vby-ay stop rnember2n .the :form oa postrZ 44projecting'npwardly from'lthe .base i122 Land. ina-ving its upper 4emi i163 angularly bentinto a position to f-contact Vwith :the f cutter supporting farm slt. is urged upwardly by :the handxlcyerzprby theosnllngi Y Y .s cinirrsvidesea hqpielil. eperationzmaylbe tmeby-aslisht upwardzprssf 'Ilhe free end of the lever' ,on .the hand 'lever With notch l55 upon 4into engagement withthe stop 63, andthejmovable, cutter 2l is thus vraised out of engagement with the stationarycutter 20. With the parts in this position, the stitching operation alone may be continued. When it is again desired to throw the pinkingy deviceinto operation, this may be done by a slight downward pressure upon hand lever 51 to move it from the position shown in Fig. 3 to the position shown in Fig. 2. When the hand lever is moved downwardly in this manner, the yoke 50 is free to move under the influence of spring 56 sothat the loop portion 53 may engage the next movement of the pitman rod to bring the notch into proper position. This position of the parts is illustrated in Fig. 2 of the drawings, and, as will be apparent therefrom, the reciprocating movements of the pitman rod are transmitted to the movable cutter 2l through the coupling member 45 and the supporting arm 28. The pinking operation will then be resumed and continue simultaneously with the stitching operation until such time as it may again be desired to discontinue it. The improved coupling therefore provides means whereby the pinking device may be thrown into and out of operation at will, without interfering with the continued operation of the stitching mechamsm.

While certain structural forms of the invention have been disclosed herein, together with the preferred arrangement of the various parts with respect to each other, it is to be understood that the invention is not intended to be limited to the precise structure and arrangement of parts as shown and described. The above description and the accompanying drawings are therefore to be regarded as illustrative only of the form and arrangement of the various elements of the improvement, and it is to be understood that the invention is susceptible of other forms and arrangements so long as they come within the scope of the appended claims.

What we desire to claim as our invention is:

l. In combination with a sewing machine having stitching means and driving mechanism therefor, a pinking device including a stationary cutter associated with said stitching means, and a movable cutter cooperating with said stationary cutter, means for reciprocating said movable cutter comprising a pitman having one end connected to said driving mechanism for reciprocation thereby and its opposite end connected to said movable cutter, means for automatically urging said movable cutter in a given direction out of cooperating engagement with said stationary cutter, and manually actuated means movable in said direction for disconnecting said pitman from said movable cutter and urging said movable cutter out of cooperative engagement with said stationary cutter.

2. In combination with a sewing machine having stitching means and driving mechanism therefor, a pinking device including a stationary cutter associated with said stitching means, and a movable cutter cooperating with said stationary cutter, a pitman having one end connected to said driving mechanism for reciprocation thereby, a coupling on the opposite end of said pitman for connecting the same with said movable cutter and disconnecting the same therefrom, and manually operated means movable in a direction to disconnect said coupling and urge said movable cutter out of cooperative engagement with said stationary cutter.

3. The combination with a. sewing machine having stitching and' driving mechanismyof` a pinking device comprising a stationary cutter associated with said stitching mechanism, a movable cutter cooperating with said stationary cutter and arranged for movement out of cooperative engagement therewith, a pitman interconnecting said driving mechanism and said movable cutter for reciprocating the latter, amanually actuated coupling in said pitman for operatively connecting and disconnecting the same at will, said coupling including a socketmember pivotally connected to said movable cutter and having a. socket therein for slidably receiving the pitman rod, releasablemeans urged in one direction for connecting-said pitman rod to said socket member, and manually actuated means for urging said releasable means in the opposite direction.

4. A pinking'device` operated by the driving mechanism of a sewing machine, comprising a stationary cutter, a movable cutter cooperating therewith, a pitman rod having its head end connected to said driving mechanism for reciprocation thereby and having a transversely arranged notch therein, a coupling member connected t0 said movable cutter by a ball and socket joint and having a socket therein to receive the opposite end of said rod with a sliding fit, a latch mounted on said coupling member for movement into and out of engagement with said notch, spring means for urging said latch into a position to engage with said notch, and manual means for disengaging said latch from said notch.

5. A pinking device operated by the driving mechanism of a sewing machine, comprising a stationary cutter, a movable cutter cooperating therewith, a pitman rod having its head end connected to said driving mechanism for reciprocation thereby and having a transversely arranged notch therein, a coupling member operatively connected to said movable cutter by a ball and socket joint and having a socket therein to receive the opposite end of said rod with a sliding fit, a latch pivoted on said coupling member for movement into and out of engagement with said notch, a spring abutment on said coupling member, a spring between-said abutment and said latch for urging said latch into engagement with said notch, and a handle pivoted on said coupling member for movement in one direction to release said latch from said notch and for movement in the opposite direction to free said latch for actuation by said spring.

6. A pinking device comprising a stationary cutter, a movable cutter supported for cooperation therewith and for movement out of engagement therewith, resilient means for urging said movable cutter out of engagement with said stationary cutter, driving mechanism, a pitman rod having its head end connected to said driving mechanism for reciprocation thereby, a coupling member connected to said movable cutter for movement therewith and having a socket therein to receive the opposite end of said rod with a sliding fit, cooperating'means on said coupling member and said rod for releasably connecting said coupling member and said rod together, and manual means on said coupling member for rendering said cooperating means ineffective upon movement of said manual means in a direction to urge said movable cutter out of engagement with said stationary cutter.

'7. A pinking device comprising a stationary cutter, a movable cutter, driving mechanism, a coupling member connected to said movable cutter by a universal joint and having a socket therefi'nra pitmanfrod having tsrheadndconnected eto :said driving mechanism for freciprocaton thereby and :having i'tshnpposi .gend `siiclabiy ireceived iinfs'ai'd socket,eooperatingfmeansonfsaid -coup1ingmemberend said rod forgreieasabiy con- `5 meeting Isaid .rod and :said coupling member :together, :manual fmeansn said/'coupling member -and movable ain vone V:direction gforiactuating .fsaid cooperatingineansmordiseonnectsaidrodandasaid coupling member awherebye said, rod may yreciprocate :in ,said xsiacleiarrand automatic A:means for :actuating sai'dcooperatingfmeanso -tconnectsaid fr odandfsaidoupling imember ,upommoyement :.saidnotch-.andiormovement in the .oppositediof aid manualgmeansY-imthe :opposite direction. -rection to ',ree said `yoke forrmovement by said In a -pinking fdeviee .ifora isewing machiizie, .-15 :springiinto azpositionzto engage I.with:said notch. @la ,movableecutteiga.supportotherefnn aspitman :N ."SOBEL. Vmdfinas/'ingariojiehrarranged:transverselytriere- Y f .HERBERT V. JACOBS. n-.and ahead ontoneiend iforattaohmentftofthe Y .v

1a-eeuwse driving mechanism vof @the sewing fmachne, 1couplingmemberorv'attachment to said'support .andhaving--a socket therein to Areceive fthep- .positerend of said -roda yoke-.ha -ingftheireeend of .its iarms tpivoted to ,said. coupling :member :for movement .of the llloop portion thereof into and foutiof. engagement with. said/notch,` an abutment prog eating outwardlyfrornv-saidcoupling member, .aspring mounted;between.said=.abutment andisaid `10 yoke, and .La :manually .operated leverpivoted on gsaid J.coupling .member for movementin one rdi- .rectionttourgesaid .yoke .out.of.-engagementmith

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