US1117607A - Trimming mechanism for sewing-machines. - Google Patents

Description

G. SCOTT.

TRIMMING MBGHANISM FOR SEWING MACHINES.

APPLICATION FILED 00T.27,19os.

1,1 17,607. Patented NOV.1'7,1914.

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G. SCOTT.

TRIMMING MBCHANISM Foa SEWING MACHINES.

APPLICATION FILED 001227, 1906.

Patented N 0V. 1'7, 1914.

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G. SCOTT.

TRIMMING MECHANISM FOR SEWING MACHINES.

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G. SCOTT.

TMMMING MBCHANISM Fon SEWING MAGHLNES.

APPMUATION FILED 001227, 1906.

1,117,607. Patented Nov. 17, 1914.

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GEORGE SCOTT, OIF AMSTERDAM, NEW YORK, ASSIGNOR TO THE UNION `SPECIAL yINIACIEIIII'E COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION ILLINOIS.

TRIMMING MECHANISM :FOR`SEIN'IN(r-MACHINES.` g

TOaZZ'w/wm/it mag/concern:

Ee it known that I, GEORGE Soo'rr. a citizen of theUnitcd States, residing at Amsterdam, in the county of Montgomery, State ot' New York,v have invented certain new and useful Improvements in rlrinuning Mechanism for Sewing-Machines. of which the following is'a description, reference bei ing had to the accompanying drawing and to the letters and figures` of reference marked thereon.

My invention relates to certain new and useful improvements in cutting mechanisms ior trimming machines, and while as to some of its features it may be used for various purposes. it is more particularly adapted to machines for cutting or trimming ofi' one or more ot a plurality of superdmposed layers ot' Vfabric prior to the stitching operation.v guiding or ldetlecting one of the cutting edges so that it will not be stitched, and securing by stitching the undetlected edge ofthe layer `or layers that havenot been cut.

VIn this type of machine at present the cutting operation begins as soon as the fabric .operated upon reaches `the cutting position. 'In certain classes vot' work, it is very desirous to control this cutting operation so that a portion of the tabricfmay be first stitched before the cutting operation begins. ["or example, in necking underweanwvhen the cutting operation begins as soon as the t'old reaches the cutting blade. the finished product is liable to give away at the top of the neck, where said cutting operation began. By controlling this cutting operation sothut the point where the cutting blade enters the fabric is .slightly *beyond the edge ol the told. and the cutting operation ceases before the edge ol' tho 'fold is reached ou the. otherside .of the neck portion, the resulting product` is what may be termed a tu med-over. neck lwhich has two plies oi t'abricz'at the top ot' the neck instead of one. thus giving `greater strength and durabilitv to-snid product.

An object ot my invention is tht-irelore. to provide meanst'or controlling thc cutting or trimming mechanism whereby the saine at the will of the Operator may `be thrown into or out oi effective.operatmn.i y t it further Lcbject of, my lnventionisi to Speccation of Letters Patent.

Patented Nov. 17, 19ML..

Application filed October 27, 1906. Serial No. 340,915.

provide a cutting or trimming mechanism which includes a separating and severing blade with controlling mechanism whereby the working positions of said blade may be changed at the will of the operator and the cutting operation rendered ineffective.

These und other objects of my invention will in )art be obvious und will in part be more fu ly hereinafter explained.

My invention consists in the novel parts improvements and arrangements herein shown and described.

In the accompanying drawings, I have` illustrated rone embodiment of my invention, the same serving in connection Withthe description herein to illustrate the 'prin-l ciples thereof. i

Figure 1 is a sectional view through the forward end ot a sewing machine embodying my invention, showing the feedbar and presser foot in side elevation, and the cut-v ting blade in operative relation to the fabric, the presser t'oot being slightly raised in order to more clearlylshow said .cutting blade. Fig. .2 is a view similar to Fig. l with the cutting blade lowered so that its cutting operation is ineffective, the stationary cutter blade being omitted `from this view. Fig. 8 is a top plan view of the forward end of a machine embodying my invention.I the work plate being removed to more clearly show the cutting mechanism. Fig. 4 is a detail view partly in section of the illustrated means for raising or lowering the operative position of the cutter. Fie'. 5 is a detail perspective view of the cutting or trimming meclninisnnthc operating means 'for throwing the cutter into and out ot eii'ective operation, .being shown detached. Fie'. is a detail view showing the presser foot in section and the relation of the cutting ,blade to the layers offabric as said cutting bladey is thrown into operation and' pierces the lower layer of 4fabric in orderl to separate the two layers and cut the lower one. Fig. 7 is a view similar to Fig. 6 showing the cutter blade between the layers of fabric.- Fig. 8 is a bottom perspective view of a fabric stitched upon my machine and showing the points at which the trimming or-cutting begins and ceases.`

Fig: 9;is a `bottom perspective` view of Inyi105 a detail vieu' showing the manner of locking thev cutting blade mechanism in its raised'or lowered position.

Referring to the particular embodiment of the invention illustrated by Way of example inl theaccompanying drawings the same will be seen to comprise a bed plate 1 from which rises a bracket 2, pivotally supporting a looper carrier 3, having a 'looper i of the ordinary.construction. Said looper receives its oscillations -in the usual manner from a link 5. Cooperating with said looperto form stitches is the well known needle mechanism, the needle of which is indicated by (i. This stitch forming mechanism may be the ordinary two needle mechanism having a single loopcr coperating therewith to form cross stitches or of any other form which includes the necessary elements for securing a cut-edge to a body fabric.

The feed dog 7 is carried by a feed bar 8 pivoted to an oscillating frame 9 which is given its oscillations in order to move the feed dog back and forward in the. usual manner by a link 90 operated from the main shaft. Said feed bar carries a depending bracket 10 which embraces an eccentric 11, carried bythe main shaft 12 and from said eccentric said feed dog is given its rising and falling movements.

My cutting mechanism in the present embodiment of myinvcntion comprises a. stationaryv cutting blade 13 which is adjustably secured to a bracket 14, supported by the cloth plate of the machine. The screw l5 l.serves to secure said stationary cutter its.

blade inl its proper position relative to the movable cutter. As shown in the drawings said stationary cutter extends to a point substantially flush with the top surface of the cloth plate. Cooperating with said stationary cutter is the movable cutter 1G which is adjustably secured to a bar 18, by means y of a screw 19 passing through a slot 2O in the shank ofsaid cutter. Said bar 18 is pivoted at its rear end to a bell crank lever 21 by a pivot bolt 4:2. Said bell crank lever is pivoted to the bed plate 1, and has its arm 22 pivotally connected to a link 23 which in turn embraces an eccentric 24 on the main shaft 12. lt Will be noted that as the main shaft rotates, the bell crank lever 21, will be oscillated, thus giving to the movable cutter a horizontal backward and forward movement. The timing of the cccentric 24 relative to the means for moving the feed dog back and forward is such'that the cutter moves forward. as the feed dog moves backward/1.1. Said cutter 16 is reciprocated across the plane of the work sup- 'f port and the face of the stationary cutter 13 by the eccentric l1, which gives the rising and falling movement to the feed dog. The-'cutter barf18 is providedlwitha de-Y lated. Said arm 30 has an enlarged end at its point of connection with theshaft` 29 and said enlarged end is provided with recesses 31, 32 33. The bearing at the lower end from the arm 25, has av recess Sel in which slides a` pin carrying a detent 36. 'A spring 37 tends normally to force the pin from the recess.v The position of the arm 30 relative 4to the recess 341 in the bearing is such that the pin las it is pushed forward by the spring causes the detent` to register with one or the other of the recessesl, 32, 33. The `purpose of the pin 35 and the detent 36 is to prevent the arm 30 from being accidentally moved as it re-v quires some pressure on the arm in order to crowd the pin 35 back into its recess, to allow the detent 36 to slide from one re-l cess to another in the arm 30. I

lt will be obvious that as the arm 30 is shifted from the position shown in Fig. 1 to that shown in Fig. 2 that the cutter bar 18 will be lowered so that the cutter 16, although reciprocated up and down by the eccentric 11` does not move. above the cloth plate and consequently the operative end of the cutter is ineffective to cut the fabric passing through the machine. While the u-'orking or operative position -of the cutter has been shifted bv the movement of the arm 30 in the present embodiment of my invention, the cutter still continues to reciprocate and move backward and forward. Cooperating with the feed dog 7 and cutting members of my machine is a presser foot which has a recess 35 extending a greater portion of the length of the presser foot. My movable cutter member is preferably provided with a sharp piercing'point so that if a folded fabric be fed to my machine, said piercing point would penetrate the fold. rlhe position of the movable cutter member when in operative relation to the fabric is such that the sharp penetrating member will enter between two layers of fabric, fed to said cutting mechanism, lifting the upper layer from the lower layer and operate to sever said lower layer. .it will be noted that the cuttingn mechanism is located in front of the stitching mechanism and said cutting mechanism is also preferably so located relative to the stitching mechanismthat one of the wcut edges may be deflected away from the stitching mechanism, while the other is secured by the stitching mechanism to the uncut layer. Tt is often desired in machines of this type, to so control the cutting mechanism that the cutting operation may be begun or terminated at the will of the operator. For example, when necking underwear, it may be desired to begin the cutting operation at a slight distance from the edge of the fold, in order that the finished product will be strengthened by having two plies of the fabric at the top of the neck. This produces` what is termed a turned-over neck. In orderto secure this operation upon my machine. all that is necessary is to lower the arm 30 to the' position shown in Fig. i2 and as the folded edge is fed to the stitching mechanism tbe cutter is in such position as to be ineffective to cut the fabric. After a certain portion oi' said fabric. has been stitched, the operator ma)l without stopping the machine, raise the arm 30 to the position shown in Fig. l. This movement of the arm 30 changes the relative position of the pin 26 to the arm 25, and thus causes the movable cutter to reciprocate across the plane of movement of the lower layer of fabric. -is the arm 30 is raised and the cutting member 16 ifs/moved up against the two layers of material passing through the machine, this movement of the cutting member into operative cutting position lifts the material at the point of engagement by said cutting member, and as the presser foot holds the material on the work support in front of said cutting member, said material is thus positioned at an inclination to the line oi forward movement ol said cutting member.

It will benoted that the t'ccd dog extends to a position in advance of the cutting member and the simultaneous lifting of the material, whereby the same is inclined to the work support, the forward movement of the cutter and the movement of the feed operate to cause the cutting member to penetrate the lower layer of the material, or if only one layer is being cut to penetrate said layer. The extent of movement of the cutting member is so adjusted that after the first layer is penetrated, the point of the cutter enters between the lawers of material, separates said layers and operates to sever said lower layer. i

In order that' the cutter may readily7 pierce the material, I have formed the movable member with a sharp piercing point, and the cutting edgeextendsbackward from said point in a line substantially parallel with the line of feed. The top portion oi the movable cutter is substantially flat, so that the upper layer of material is properly supported and lifted from the lower layer which is being severed.

lVhen it is desired to terminate the cutting operation, all that is necessary is to lower the arm 30 which changes the working or reciiirocating position ot the cutter so that the cutting edge thereof does not cross the plane of the cloth plate.

,ly the above construction it will be seen that l .have provided a trimming device which may be so controlled that one of two superposed layers of material passing through the machine may be pierced at a point within its iree edge. Also by the above construction. the operation of severing' the fabric muy be rendered effective o1' inelt'ective without stopping the machine, at the will olf the operator.

l have shown in Fig. on a reduced scale, :i rolde-d 'fabric lf. stitched and eut in the nninner above described. lt will be noted that the stitchingr begins at the edge of the l'old and the cutting operation at a point Z) iieyond the edge ol' the Fold and terminates at a.I point c a short distance from the edge o'll the told on the opposite side of the neck.

While vI have described my machine as particularly adapted for necking underwear, it is obvious that the same is useful for a number -oi other purposes such as cutting and stitching oi hcms` cutting and stitching of collarettes, in appliqu work, in open work for cutting out certain portions when desired and in various other classes of work of a similar character. either with or without stitchingl mechanism.

lt is obvious that many changes may be made in the detail 'lorm of structure illustrated b v me, without departing from the spirit oi' my invention. lVhile I have shown an arm carrying an eccentric pin for throwing the cutting mechanism into and out of operative position. it is apparent that any other torni oi inciifhanism for securing this result may be substituted for that herein disclosed. It is also obvious that a difierent arrangementand location of parts may be made without departing from the spirit of my invention so long as a cutting blade which has the combined function ot' sepa' rating the layers ot fabric and severing one of the same. is moved into and out of clicctive operative relation to the fabric, so that the cutting of said layer may be controlled at will by the operator.

Having thus particularly described my invention, what I claim as new and desire to secure by Letters Patent is:--

l. .X trimming machine including in combination a work support, feeding mechanism. a trimmingl blade having a forwardly projecting piercing point and a cutting edge in rear thereof, ineens lor moving said blade i'or severing the fabric, and means for movin said blade to withdraw the same from the path oi the fabric whereby itscutting` action is rendered inel'ective and for causing' said trimming blade to engage the vfabric and bend the same whereby the piercing point may enter the fabric and the cutting'action of the blade may be rendered effectivc.

A. trimming' machine including in combination a Work support, feeding mechanism, a trimn'iingg' blade located beneath the work support and projecting above and overhanginp' the same, said overhanging portion having a cutting edge and a 'piercing point, and means whereby the piercing point of the vtrimming' blade may be moved beneath the surface of the worksupport or raised abro-'J the same at will. for rendering said trimming' blade ineffective or effective.

A trimnmig machine including in combination a Work support, feeding mechanism. a movable trimming blade mounted beneath thc work support and projecting above and overhanging the same, Said overhang'ing portion having a cutting' edge and a piercing point, means for moving said blade for its cutting' action, and means 'whereby the piercing' point of the trimming blade maj.' be moved beneath the surface of the work support for rendering said trimming blade ineffective and may be raised above tluwork support for engaging the under fare of the fabric, bending the same, whereby the piercing point may enter the fabric and the cutting action of said blade be. rendered effective. and a. presser foot above the u'orl: support for engaging the upper faceof the fabric adjacent the trimming blade for holding the fabric so as to cause the piercing point to enter the same.

4. A sewing machine including in combination a work support. stitch forming mechanism. feeding mechanism, and a trimming mechanism. said trimming mechanism including a trimming blade mounted beneath the ivorl: supj'vcn-t and projecting above and werhangingF the work support. said projecting portion of the trimmer blade having a piercing peint and a cutting edge in rear thereof,`sai 'l blade being' located in advance of the stitching mechanism, means for reciprocating,r the trinuning blade, and means for moving the j'iiercing point of the trimminaf blade beneath the surface of the work support for wandering the same ineffective and. for raising the piercing point above the Work support for causing' the same to engage the under face of the fabric and penetrate the same u'herebv the trinnning blade majY be rendered effective.

A sewing machine including in combination a work support, stitch forming mechanism, feeding mechanism. and a trimming mechanism, said trimming mechanism including a trimming blade mounted beneath the Work support and projecting above'and overhanging the Work support, said projecting portion of the trimming blade having a Minco? piercing point and a cutting edge in'rear thereof, said blade being located in advance of the stitching mechanism, means for reciprocating the trimming blade, means for moving the piercing point of the trimming blade beneath the surface of the ,Work support for rendering the same ineffective' and for raising thev piercing point above the Work support for causing the same to engage the under face of the fabric and penetrate the same whereby the trimming blade may be rendered effective, and a presser foot extending to' a point in adi-'ance of the trimming blade and having a groove in its under face to recel .e the trimming blade. L

6. A- sewing machine including in combination a. work support,- stitch forming mechanism, feeding mechanism, and a trim-l ming mechanism, said trimming mechanism including a stationary trimming'blade having its upper face substantialliY Hush Withv the upper face of the Work support, a movable trimming blade located beneath the Work support and having a shank projecting above the u'ork support, an overhanging portion carried by said shank, said overhanging portion having a piercing point, and a cutting er ge adapted to coperz-ite with the stationary trimming blade, means for reciprocating said movable trimming blade, and

means whereby said lmovable trimming blade may be depressed to carry the piercing point thereof beneath the plane of the Work support or raised to lift the piercing point above the plane of the Work-support at the will of the operator.

7. A sewing machine including in combination a Wol-l: support, stitch forming mechanism, feeding mechanism, and a trimming mechanism, said trimminfY mechanism including a stationarv trimming blade having its upper face substantially i'iush 'with the upper face of the work support, a movable trimming blade located beneath the Work support and hai-'ing a kshank projecting above the work support, an overhanging portion carried by said shank, said overhanging portion having -a 'piercing point. and a cutting edge adapted to cooperate with the stationary trimming blade, means for reciprocating said movable trimming' blade, and means .whereby said movable trimming blade may be depressed to carry the piercing,r point thereof beneath the plane of the work, lsupport or raised to lift the piercing point above the plane of the Work support at thc will of the operator and without stopping the stitching mechanism.

8. A. sewing machine including in combination a 'work support, stitch forming mechanism, feeding mechanism, and a trimming mechanism, said trimming mechanism including a stationary trimming blade having its upper face substantially Hush with the upper face of the Work support, a movable trimming blade located beneath the work support and having a shank projecting above the work support, 4an overhanging portion carried by said shank, said overhanging portion having a piercing point, and a cutting edge adapted to cooperate with the stationary trimming blade, means for reciprocating said movable trimming blade., and means whereby said movable trimming blade may be depressed to carry the piercing point thereof beneath the plane of the work support or raised to lift the piercing point above the plane of the work support at the will of the operator, and a presser foot for engaging the fabric, said pressei" foot extending to a point in advance of the movable trimming blade and having a groove in its under face to receive said movable trimming blade.

9. A sewing machine including in combination a work support, stitch forming mechanism, feeding mechanism and a trimming mechanism, said trimming mechanism inclu-ding a stationary trimming blade` a movable trimming blade, including a shank extending across a horizontal plane containing the cutting edge of the stationary trimming blade, said shank having an overhanging portion and a piercing point at the forward end thereof` means for reciprocating said movable blade. and means for giving said stationary trimming blade and said movable trimming blade a relative movement for positioning the point of the movable trimming blade so that during the reciprocations of the movable trimming blade there will be no space betweenthe blades and the cutting action of the trimming mechanism may be rendered ineffective and means for restoring said trimming blades to their normal cutting position.

10. A sewing machine including in combination a work support, stitch forming mechanism, feeding mechanism and a trimming mechanism, said trimming mechanism including a trimming blade mounted bcneath the work support and projecting above and overhanging4 the work support, said projecting portion of the trimming blade having a piercing point and a cutting edge in rear thereof, said blade being located in advance of the stitching mechanism` means for reciprocating said trimming blade, means for moving the piercing point of the trimming blade beneath the surface of the work support and for raising the piercing point above the surface of the work support at will for rendering said trimming mechanism ineffective or eli'ective. said feeding mechanism including a feed dog having feeding teeth both in front and in rear of the piercing point.

1l. A sewing machine including in combination a work support, stitch forming mechanism, and a trimming mechanism, said trimming mechanism including a movable trimming blade mounted beneath the work support and projecting above and overhanging said Work support, said overhanging portion of said trimming blade having a piercing point, means for moving the trimming blade forward and backward and for reciprocating said trimming blade across the plane of the work support to cut the fabric, means for moving the ercing point of the trimming blade beneat i the surface of the work sup ort for rendering the trimming blade ineffective and for raising said piercing point above the surface of the work support whereby the saine is caused to engage the under face of the fabric und penetrate the same and thereby resume its cutting action.

12. A sewing machine including in combination a. work support, feeding mechanism and a trimming mechanism, said trimming mechanism including a stationary trimming member having its upper face substantially flush with the work support,'a movable trimming member projecting above and overhanging said work support, said overhanging portion having a piercing point, means for moving said movable trimming member to cut the fabric comprisingan eccentric, a yoke operated by said eccentric, and an adjustable connection between the yoke and said trimming member whereby the piercing point may be moved beneath the surface of the work support for rendering 'the trimming 'mechanism ineffective, or raised above the surface of the work support whereby said piercing point will engage the under vface of the fabric and penetrate the same and thereby resume its cutting action.

13. A trimming mechanism for sewing machines including in combination a staitionary cutting member, a movable cutting member coperating therewith. means for moving said movable member to cut the fabric, comprising an eccentric, a yoke operated by said eccentric, a forked member carried by said volte, a pin resting within said forked member, a shaft on which said pin is eccentrically mounted. and means connected with said movable cutting men'iber for supporting said shaft, and means for shifting the shaft so that the movable cutting meiuber is brought below the stationary cutting member. whereby the. cutting action of said cutting member may be rendered effective or ineffective.

1 4. A trimming mechanism for sewing machines including in combination a stationary cutting ineniber, a movable cutting meinber cooperating therewith, means for moving said movable member to cut the fabric, comprising an eccentric, a yoke operated by said eccentric, a forked member carried by said yoke, a pin resting within said forked member, a shaft on which said pin is eccen- 15. A trimming mechanism for sewing` machines including in combination a stationary member and a movable member, means for moving said movable member forward and backward, Aand means for reciprocating the same across the plane of the Work support, said last named means including a shaft, a pinr eccentrically carried thereby, and a hand lever for oscillating said. shaft whereby the position of the cutting member relative to the Work support may be changed; substantially as described.

1(3A trimming mechanismincluding in combination a stationary member and a movable member, means for moving said movable member forward and backward, and means for reciprocating the same across the plane of the work support, said last named means including a shaft, a'pin, eccentrically carried thereby, and a hand lever for oscillating said shaft, whereby the position of thefcutting member relative to the Work support may be changed, and means for holding said shaft in predetermined adjusted positions, substantially as described.

' 17. A sewing machine including in combination a work support, lstitch forming mechanism, a trimming mechanism including cutting members located in advance of the stitching mechanism comprising a stationary cutting blade, means for adjustably supporting the same, and a movable cutting blade,

a bar to which said movable cutting blade is adjustably connected, means for oscillating said bar whereby the movable blade -is caused to sever the fabric, said last named means including a yoke, an eccentric for operating said yoke, a pin connected to said yoke,.a

shaft on which said pin is eccentrically mounted, a hand lever for operating said shaft, and means for holding said .shaft in predetermined positions, substantially as described.` v

18. A trimming mechanism including in combination, a Work support, a trimming bla de having a piercing point and a cutting edge in rear-thereof, said piercing point and cutting edge being so disposed as to penetrate and out one of two superposed layers of fabric, andl means operative to rendersaid trimming blade eiective when the material lies across the normal path of reciprocation or' the blade in its eftective positiom'said blade operating to penetrate'the material and commence its cutting action. 19; A trimming mechanism including yin combination a work support, a trimming bladehaving a piercing point and a cutting edge in rear thereof, said piercing point and cuttingcdge beingso disposed as to pene.- trate and out one of two superposed layers of fabric, and means operative to render said trin'nningl blade effective when lthe ln'oaterial is above the blade, said yblade operating to penetrate the material and .commence its cutting action.

In testimony whereof l aiHX my signature, in presence of two Witnesses. GEORGE vSCOTTI.. Witnesses: @Heeren MCNEIL,

-WILLIAM P. Hoven.

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