Патент USA US2105184код для вставки
Jan. l1, 1938.A ` , s. M. cREwDsoN - 2,105,184 uATTACHMÉNT FOR SEWING MACHINES Il ' Filed Feb. 28, 1935 * 2 Shee’cs--Shee‘tI l @576\ i 75 ' || v 1 j@ »è l IH HI i - : IIIV’ " 1 415 _ 0 ß œ . Jan. 11, 1938. s, M, CREWDSON I ' 2,105,184 ATTACHMENT FOR SEWING MACHINES Filed Feb. 28, 1935 ‘ w y w ‘ _ 61 @_ @3 ¿a ` ` 2 Sheets-Sheet 2 \ ¿l . @E 66 _Z6 _ Lag ‘ .11 „5055 . J5 Z0 57 Ñ v6559- » 60 fnl/75%" _ h Jara/ZM Crea/¿50m @J "@Ér; Patented Jan. 1v1, 1938 5,1% UNITEDST’AÍTES' PATH ortie ATTACHMENYTJFOR SEWING MACHINES » Sarah M. Crewdson, Chicago;` `Ill., assigner of one-third to Robert H. Goedhart, Chicago, Ill. ` Application February 2s, 19735, serial No. »8,626 13 claims; _ (Cr.- 11a-_124) The invention relates `to an attachment for Figure 1 >is a plan view'of the attachment con- _ ' sewing machines and has for its object to pro structed in accordance with the invention `and vide an attachment that will triml a seam by cut shown in association with the operating elementsy ting the material to form either a straight edge of a` sewing machine; " Y 5 or an irregular edge at a predetermined distance ' Figure 2 is a side elevational view of the at tachment of Figure l showing a pinking element from the seam. Another object of the invention is _to provide 'an attachment of the character described thatA can be readily secured to-a sewing machine Vin 10 a plurality of adjusted positions with respect to the needle to permit the operator to vary thev distance of the severed edge from the stitching, thereby cutting margins of variable widths. Another object resides in the provision of an attachment that will embody novel means for operating the same from the reciprocating needle with feed rollers cooperating therewith; Figure 3 is a side elevational view of the at-tachment of Figure l, showing the operating mechanism for connecting the rotary cutting ele 10 mentwith the sewing machine; > " ' Figure 4 is a bottom plan view of the attach ment; _ l Figure 5 is a sectional lView taken-»substantially l along line 5_5 of Figure 4 showing a pinking element in contact with the feed roller and aprons post of the sewing machine and which means will ‘ for directing the material into engagement there synchronize the cutting element with the feed with; mechanism of the machine vso that the rate of 20 travel of the material through the machine will be the same as that through the attachment. ‘ Another object of the invention is to provide ' . Figure 6 is a detail sectional view taken along line 6_6 of Figure 2; ~ 20 vFigure 7 isa detail sectional view taken along- . line ‘l--l of Figure 5; and ‘ Figure 8 is a'sectional view similar to Figure 'l an attachment such as described which will ac commodate thin material and also heavier thick Y but showing a rotary cutting element in associa material having resilient means for maintaining y tion with the feed rollers. 25 the proper pressure on the material during the I The present invention particularly relates to cutting operation. g f Another object of the invention is to provide an attachment having a rotary cutting element 30 for severing the material on a straight edge and which can be readily replaced by a rotary pinking element when it is desired to trim the edge with an irregular design. improvements over the form of mechanism for trimming seams shown in my copending appli cation, Serial No. 743,642, filed September l12, 1934.' t Referring to the'drawings, the attachment has been shown in associated relation with certain operating parts of a sewing machine of the type The invention also contemplates the'provision Y adapted for home use and which consists of a` oí feed rollers for feeding the material through the attachment and novel mounting means for the lower feed rollers, whereby one of said rollers is resiliently held in engagement with the cuttingV work supporting surface li), a vertical recipro cating needle post il carrying a needle i2, and a‘ supporting post i3 having the foot Hl secured thereto by the thumb screw l5 and >which holds element for performing the cutting operation and ment in one direction to provide a solid and un the material to be sewed in contact with feeding mechanism i6 of the sewing machine.- It is to be understood that the supporting post I3 can yielding surface for the pinking element. be vertically reciprocated by the operator and is 40 which rollers may be locked against bodily move A further object is to provide a sewing machine attachment of improved construction having rub 45V ber surfaced feeding rollers for positively feeding the material. Y ing the sewing operation, being lifted- by the operator to remove the same from the material at the end of the sewing operation. » With these and various other objects in view the invention may consist of ' certain novel fea tures of construction and operation, as will be t 50` more fully described and particularly pointed out ` in thespeciñcation, drawings and claims append ed hereto. y In the vdrawings which illustrate an embodi ment of the invention and wherein like reference 55 characters refer to >like parts--l yieldin'gly held in contact with the material dur ' ' ’ The attachment essentially consists of a frame member, Figure l, which includes'a vertical'sup porting member I8, having an inclined working surface 20'secured thereto. Extending‘ironi one side- of the member l8‘is a boss 22 overlying but being spacedfrom the working surface as `b-est shown in Figure 6. Extending from the member |-8 below the working surface are two spaced > bosses 23, Figure 7, and 24, Figure 6, which bosses 5.5. 2 2,105,184 journal shafts to be presently described. The the cutting element at the proper speed. The right angled strap members 25 and 26 are suitably bolted to the lower portion of wall I8 and to the invention also contemplates that the ratchet wheel 34 may be` reduced in size and pivot 39 of pawl 38 relocated to secure the correct speed of surface 20, said strap members thereby support ing said surface from the member. Adjacent the base of said member and to the rear thereof is provided a laterally extending foot portion 21 which extends for part of the distance of the surface 20 to aid in supporting the frame in hori 10 Zontal position on the surface l0 of the sewing machine. Ul The boss 22, Figure 6, journals a shaft 28 which projects from the end of the boss for receiving the washer 3B, the cutting element 3| and re 15 taining member 32, the parts being keyed and held fixed to said projecting end of the shaft by the bolt 33. The opposite end of shaft 28 pro jects from the wall I8 to which end is fixedly secured the ratchet wheel 34. Rotatably mounted 20 on the end of shaft 28 projecting beyond the ratchet wheel is an operating arm 35 having the stud 36 integral therewith and which is held on the shaft by the bolt 31. The cutting element may take the form of a pinking knife for cutting an irregular edge or a cutting blade for severing the material along a straight edge. One end of the operating arm, Figure 3, has the pawl 38 -pivoted thereto as at 39 and which is> held in contact with the ratchet wheel 34 by 30 the coil spring 40. The other end of operating rod 35 is bent at right angles forming an inter mediate section 4|, shown in Figure 1, and which section is further bent and turned downwardly, forming the portion 42 having a recess for en gaging the stud 43. Said stud has a knurled end 44 and is suitably secured to the reciprocating needle post || of the machine. From the foregoing it will be understood that vertical movement of the needle post will oscil 40 late arm 35 to cause engagement of pawl 38 with ratchet wheel 34, causing rotation of said ratchet the cutting element. The work supporting surface 2U is provided with an opening directly below the cutting element 3|, Figure 5. Part of this opening is closed by a rear apron 50 which is suitably secured as at 5| to the underside .of surface 20. Forward of said open- . ing there is provided a front apron 52 also suit ably secured to the underside of surface 2l), the free edge of said apron resting on the lower feed rollers 53 to direct the material between said cut ting element and the feed rollers. Said feed roll ers are journalled in a yoke 54 by means of the stud 55 passing through the arms of said yoke and which stud at its inner end is cut away on its lower side providing the flat surface 56, as shown in Figure 5. The yoke 54 is provided with a shaft 20 51 which is journalled in boss 23 of the vertical wall I8, the other end of said shaft extending be yond the boss and receiving the coil spring 58 which is retained thereon'by the washer 59 and bolt 60. The coil spring therefore yieldingly holds the yoke in contact with the end of boss 23. The shaft 51 however mounts the yoke within the frame so that the same may have rotation, there- . by supportng the feed rollers 53 for bodily move ment in a direction toward and away from the 30 cutting element. Movement of the feed rollers in this manner is desirable as it is necessary that the attachment accommodate thin, light material as well as heavy, thick material, and in order to apply the proper pressure on the material for :i feeding the same, a resilient member 6| is pro vided, said member having one end ñxed to sup port 62 and its other end in engagement with the yoke 54. Y By reason of the resilient member 6| the feed 40 rollers will be yieldingly held in contact with wheel and shaft 28 in a counter-clockwise direc- ` the cutting element 3|. tion, Figure 3. Rotation of the shaft'28 by the reciprocating element of the sewing machine will 45 therefore rotate the cutting blade of the attach ment. A locking dog 45 is provided, pivoted to the wall at 46 and yieldingly held by spring 49 in contact with the ratchet wheel, in ’order to pre vent reverse rotation of said ratchet wheel. How 50 ever, the degree of oscillation of the arm 35 is in excess of that required to rotate the cutting ele ment in synchronism with the feeding mechanism of the sewing machine, and accordingly the in vention has provided means for disconnecting However, for starting Ythe material through the attachment it is desir able that the feed rollers be located out of en gagement with the cuttingrelement so that the material may be easily positioned therebetween. For accomplishing this a release lever B3 is pro vided, Figure 3, having the stud shaft 64 secured thereto, and which is mounted in the frame i8. Said stud shaft has ñxed thereto on the opposite side of the frame the arm 65, Figure 5. Said armoverlies the projecting end of shaft 55 which journalsY the feed rollers so vthat actuation of lever 63 inA a direction to impart clockwise ro pawl 38 from the ratchet wheel at the end of the Y tation to arm 65 will rock the yoke 54 in a dovm- , downward stroke of the arm. Said pawl -carries ward direction, moving the feed rollers out of I at its extreme outer end the pin 41 and the wallY I8 has suitably secured thereto an abutment 48v which is adapted to engage the pin to throw the 60 pawl upward out of contact'V with the ratchet Wheel. Thus the arm 35 has operative connec tion with ratchet wheel 34 for only a part of its downward stroke and by properly positioning abutment 48 the throw-off pawl 38 can bev timed 65 so as to accurately synchronize the speed of rota tion of the cutting element with the feeding mech anism of the sewing machine so that just the amount of material supplied- by the sewing ma chine is fed through the attachment. It will be contact with the cutting element. The cutting element 3| contacts the periphery of the inner feed roller and as the material passes between these two elements the same is severed, forming an irregular or pinked edgercorresponding with the design of cutting element. For this opera tion it is necessary to lock the feed rollers against bodily movement as above described, since the severing of the material by element 3| would be « impossible if the feed roller could be depressed. The locking means consists of an eccentric 66 understood that where it is possible to lengthen the arm 35 by locating the attachment" further carried by shaft 61 which is journalled in the boss 24 on the frame. On the opposite end of shaft', 61 is suitably threaded a knob having a knurledportion 68Y and a collar 10 which is flat to the rear of the needle that the throw-off for tened for a portion of its periphery and against the pawl can be dispensed with since under these which rests the strip of spring metal 1|, Figure 3. The supportingY Vstud 12 projects from the frame ' ward stroke of the arm will befnecessary to rotate» and'positions said metal strip so that pressure conditions full engagement thereof for'the down 3 groener, is' maintained on the 'collar`10 of the ïwheel to prevent inadvertentv rotation of eccentric 66. stud 8|, whichreceives the coilV spring 82 for yieldingly holding the parts together. By means . However, after the material has been located be tween the cutting element and the `feed rollers and it is desirable to lock the feed rollers against ofthe pivotal relation between the parts of the scale the foot I4 can be raised by the operator bodily movement, the voperator v'grasps V'the knurled portion 68 andtrotates shaft 61 andec sewed Without detaching the part 15 of the scale from the attachment. This operation is neces sary when it is desired to raise the foot i4 for its centric 66 until the same contacts vwith the flat surface 56 oftheshaft 55. With the eccentric 10 in‘contact Vwith the‘ñat surface 55 of the shaft it is impossible to move the feed rollers in' adi rection downwardly and therefore said rollers provide a ñrm kand unyielding surface` for the cutting element.` 15 ' l f In addition to trimming seams with'J an ir alimited extent to >adjust the material being full height. , , ‘ Figures 1 and 2 show 'a guard`83 for protect ing the fingers of the operator from contact with the cutting element. Said guard is Vpivoted at 84 to a portion 85 secured to member iS. rlI‘he pivot 84 is provided with resilient means to yieldingly maintain the guard in horizontal position with the stop 8G in contact with the frame member as pinking attachment 3l, the .present device is also v shown in Figure 6. This construction holds the capable of trimming said seams on a straight guard in position for protecting the operator but can be easily lifted when it is desired to remove edge. The invention contemplates that the ele regular design, which is accomplished by >the 20 ment 3l may be replaced by the upper feed roll-` ers 53 and cutting blade 13. Figure 8 shows the association of the: feed rollers with respect to the cutting blade, it being understood that the the cutting element from the attachment and replace vthe same with a cutting element having other and different characteristics. , Projecting from frame i8 is a rod 81, as shown inFigure 1, to which is adjustably secured mem ber 88, said member _being adapted to be held in >position on said rod by tightening of the screw ment 3l thereon. The yoke 54 has been pre viously described as journalled in boss 23 in a ’ 90. 4The member forms a support for the mate manner permitting axial movement against the . rialguide‘ SI. to assist the. operator in guiding tension of the coilfspring 58. This construction the same from the needleof the sewing machine has been provided in order to yieldingly hold' one to the cutting mechanism of they attachment. -“ In the operation of cutting the material por-V of the lower feed rollers 53 against the sur face of the cutting blade 13, asv shown in Figure tions thereof ñnd theirway between the lower 8. When the cutting blade is associated with feed rollers Y53. If the lint and scrap pieces of material are not removed from between the the feed roller in this manner the parts effec tively perform a cutting operation, severing the feed rollers they soon interfere with the operation ‘ material with a clean cut forming a straight of the same. For this purpose the invention pro vides a stripping finger 52, Figure 2, suitably edge. `When thecutting blade hasbeen sub stituted for the pinking element the locking, secured at one end to foot portion 21 having its eccentric 66 is rotated to position the same »out free end located between the feed rollers 53. The of Contact with shaft 55 so that the yoke and the ñnger is preferably of spring wire so that the 40. same maintains its position between the feed lower feed rollers have bodily/movement, be ing yieldingly held in contact with the upper rollers, whereb-y the pieces of material and lint feed rollers located on the respective sides of the are effectively removed. The invention is notV to be limited to or by de cutting- blade. As shown in Figure 8, said upper feed rollers are equipped with rubber tires 14. tails of construction of the particular embodi 4.5. ' It is not absolutely necessary that the tires be ment thereof illustrated by the drawings, as vari parts are keyed to the shaft 28 and retained 25 thereon by bolt 33 which likewise retains the ele 30 ' 35 40 45 composed of rubber as any friction material will function just as satisfactorily. rI“he main ob ous other forms of the device will of course be Yapparent to those skilled in the art without de ject of surfacing the periphery ofthe upper feed parting from the spirit of the invention or the rollers in this manner is to insure positive feed scope of the claims. 50:1 What is claimed is: of the material through the attachment. 1. An attachment for sewing machines com Í The attachment is held in' adjusted position on the surface IB of the sewing machine by means prising a rotary cutting element, means opera . of the scale 15 having graduations thereon and tivelylconnecting said element with a movable member of the sewing machine, whereby said 55 being provided with an elongated slot 16. The element is rotated by the action of the machine, member I8 is reduced in height at the end ad jacent the supporting post I3 and is provided with a projecting screw 11 having the winged nut 18 thereon, the screw extending` through the. slot in the scale,'which is then held to the at tachment by the winged nut. „The scale 15 ter minates in the upwardly bent portion 19, Figure 2, to which is pivotally secured a bent member 35 which may be considered as a separable part 65 of the scale. Member 8@ is bent at one end to form a U-shaped portion which is adapted to overliethe secured portion of the foot I4 so that the foot and member are releasably secured to the supporting post i3 by the thumb screw 70 l5. When the separable parts of the scale are rigid with each other vibrations from the sewing machine are readily transmitted to the attach ment and in order to reduce these vibrations to a minimum the invention pivotally secures the 75 separable parts of the scale to each other by the a scale adapted to be secured to a member' of the machine and extending laterally with respect to» the needle, means for adjustably securing the at-, tachment to said scale, and means provided on the scale for absorbing the vibrations of the sewing machine whereby they are not transmitted to the attachment. 2. An attachment for sewing machines com prising a rotary cutting element, means opera 65 tively connecting said element with a movable member of the sewing machine whereby said element is rotated by the action of the machine, a scale adapted to be secured to a member of the machine and extending laterally with respect to 70 the needle, and means for adjustably securing the attachment to said scale, said scale compris ing two sections pivotally secured together where by the vibrations of the sewing machine are not transmitted to the attachment. 75 4. 2,105,184* 3. An attachment for Vsewing machines' com; prising a rotary cutting element, means opera-v tively connecting said element with a movable member of the sewing machine whereby said 5 element is rotated by the action of the machine, a scale adapted to be secured to a member of the machine and extending laterally with respect to the needle, and means for’adjustably securing the other end of the scale to said attachment, 10 said scale having a yielding joint intermediate its ends for absorbing the vibrations of the sewing machine whereby they are not transmitted to the attachment. cutting element for performing a cutting opera ' . 5. An attachment for sewing machines, com 25 prising a frame member, a shaft mounted for rotation in said member and carrying a cutting blade, a feed roller positionedV below said bladeV and having association therewithto perform a cutting operation, means journalling said roller, 30 said means being mounted for movement in the frame in a direction parallel to the axis of the roller, and resilient means biasing said mounting means to maintain the cutting blade and rollerin contact. 6. An attachment for sewing machines, com 35 prising a frame member having a rotary cutting element, a feed roller positioned below the cutting element and having contact therewith for per forming a cutting operation, means journalling 40>`the feed roller, a shaft carrying said means and being mounted in the frame for movement in a direction parallel to the axis of the roller, `and resilient means on the shaft for biasing the journalling means in a direction to'hold the feed 45uroller in contact with the cutting element. 7. An attachment for sewing machines, com prising a frame member> having a rotary cutting element, a roller positioned for contact with the cutting element, means journalling said roller, a öo-_shaft carrying said journalling means and being mounted in the frame for rotation, resilient means forcing the roller into Contact with the cutting element, and a manually operable lever for holding the roller out of contact therewith. 55 means to depress the same against the tension of the resilient means. , 9. An attachment for sewing machines, com prising a frame member having a rotary cutting element, a roller positioned below the cutting element, a‘ yoke journalling the'roller and being rotatably mounted in the frame, whereby said roller is supported for bodily movement, resilient means forcing the yoke upward to hold the roller in contact with 'the cutting element, and a lever adapted to be manually actuated forhold 4. An attachment for sewing machines, com 15 prising a frame member having a rotary cutting element, a feed roller positioned below' the cutting element, means journalling said roller and being’ mounted in the‘frame for movement in a direc tion parallel to the axis of the roller, and means 20 biasing the mounting means in a direction to hold the feed roller in engagement with the tion. contact with the cutting element, and a manually' operable lever adapted to engage the journalllng 8. An attachment for sewing machines, `com- prising a frame member having a rotary cutting element, a roller positioned for contact with the l cutting element, means journalling said roller, a'v shaft carrying said journalling means and being 60 mounted in the frame for rotation, whereby said roller is supported for bodily movement, resilient means biasing said shaft to force the roller into ing the roller out of contact with the cutting ele ment. ‘ 10. An attachment for sewingv machines, com prising a frame member having a rotary cutting element, a roller positioned below the cutting ele ment, a yokejournalling the roller and being ro tatably mounted in the frame, whereby said roller is supported for bodily movement, resilient means yieldingly holding the roller in Contact with the cutting element, and a manually operable lock for locking’the yoke preventing downward move ment of-the'same. l1.- An -attachment for sewing machines, com prising a frame, a shaft journalled in the frame and carrying a cutting blade, feed rollers fixed to the shaft and positioned on the respective sides of the blade, lower feed rollers located below the 30' blade, a yoke journalling the lower feed rollers and being rotatably mounted in the frame, where by said rollers are supported for bodily movement, and resilient means biasing the yoke to yieldingly hold the lower feed rollers in contact with said first mentioned feed rollers. 12. An attachment for sewing machines, com' prising a frame, a. shaft journalled in the frame and carrying >a cutting blade, feed rollers fixed to the shaft and positioned on the respective sides 40 ofthe blade, means' rotating said shaft whereby said feed rollers are driven, lower feed rollers located below the blade, a yoke> journalling the lower feed rollers and being rotatably mounted in the frame, resilient means yieldingly forcing the yoke upward to hold the lower feed rollers in contact with the driven rollers, and a lever adapted to be manually actuated for holding the lower rollers ou-t of contact with said driven rollers. 13. An attachment for sewing machines com prising, a rotary cutting element, a rotatable shaft therefor, means operatively connecting said cut ting elementwith a reciprocating member of the machine whereby said element is rotated by the action of the machine, said means including a ratchet wheel fixed to said shaft, an arm pivoting on thershaft and carrying a pawl engaging the ratchet wheeLand an abutment for disconnecting the pawl for a part of the downward oscillating 60 stroke of the arm. SARAH M. CREWDSON.