US2339648A - Sewing machine - Google Patents

Description

Jan, `18, 1944. H. c. NlssEN Erm. 2,339,648"

SEWING MACHINE Filed Jan. l8,1942

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SEWING MACHINE Filed Jan. s, 1942 2 Sheets-Sheet` 2 En glwumfvm James E ugeeman/ am@ :Q1/enig a /Vls'en/l EM gw; a' NM Patented Jan. 18, 1944 SEWING MACHINE Henry C. Nissen, Stratford, and James E. Ackerman, Devon, Conn., assignors to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application January 8, 1942, Serial No. 425,956

8 Claims.

This invention relates to sewing machines and more particularly to sewing machines which are tted vn'th work-guides, especially such as binders, folders and the like.

In stitching a binding or a plain strip of fabric to a body material it has heretofore been the practice to utilize a sewing machine fitted with an appropriate conventional stationary stripguide mounted upon the machine cloth-plate directly in front of the stitching mechanism. Such sewing machines have used, in this type of stitching operation, various types of feeding mechanisms including` the lower four-motion, the upper four-motion and the needle-feed. However, in each case, no matter which type of feeding mechanism was used, the strip material was pulled through the work-guide by means of a feeding mechanism, and as the work-guide oifers resistance to the passage of the strip, a' tension is thereby produced within the strip. This tension is normally not objectionable when the strip is of the usual woven wool, silk or linen type of iiber which is naturally non-elastic and non-adherent. However, when a strip of material is used having elastic and adhering properties, such as rubber or one of the synthetic materials, the work-guide through which the strip is pulled by the feeding mechanism introduces a drag on the strip to stretch it a substantial degree. The strip mate-- rial is therefore stitched tothe body-material while stretched and the resultant product becomes puckered as the elastic strip recovers its initial or unstretched condition.

It is therefore a primary object of the present invention to produce a, sewing machine which will overcome the puckering eect incidental to stitching strips, binding tapes and the like having elastic and adhering properties.

With the above and other-objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment oi the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

The several features of the present invention will be clearly understood from the following de-l scription and accompanying drawings in which- Fig. 1 is a front sectional elevation of a sewing machine embodying the present improvement.

Fig. 2 is a left end elevation of the machine shown in Fig. 1

.- the fulcrum stud Fig. 3 is a top plan view of the Work-arm, Workguide, presser-foot and feed-foot.

Fig. 4 is a view similar to that of Fig. 3, but` showing the work-guide in a diierent position.

Fig. 5 is a fragmentary vertical section taken substantially along line 5-5 of Fig. 4.

Fig. 6 is a perspective view of a piece of body material being bound by the present machine.

Fig. '7 is a transverse sectional view of a finished portion of a product and taken substantially along line 1-1 of Fig. 6.

Referring tothe drawings, the sewing machine comprises a frame including a bed I from which rises the standard 2 and the overhanging bracketarm 3 terminating in the hollow head 4. Journaled in suitable bearings provided in the standard 2 and bracket-arm 3 is the main or needlebar actuating shaft 5, carrying at one end the usual handand belt-wheel 6. The main-shaft 5 also carries the pulley 1, connected by means of the clip belt 8 with the pulley 9 secured upon the loop-taker-actuating shaft I0, suitably journaled in bearings provided in the bed I and carrying the loop-taker II.

At its forward end, the main-shaft 5 carries a crank I2 to which is secured the crank-stud I3 connected `by the link I4 to the needle-bar I5 carrying the eye-pointed needle I6. By means of this construction, endwise reciprocatory movements are imparted to the needle-bar I5 which is journaled in vertically alined apertures formed in an oscillating feed-frame I1.

'I'he feed-frame I'I is mounted to oscillate upon oppositely arranged pivotal bearings comprising I8 threaded into the overhanging arm 3, and pivot-pin I9, secured by the screw 20 in the arm 2| of said feed-frame I'I and entering an aperture 22 formed in the bed I. To the forward end of the arm 2I of the feed-frame is rigidly secured by means of a screw 34 the feedbar 23 having a raised serrated portion or feeddog 24 and a needle-aperture not herein shown. The feed-frame I'I receives its oscillating movements from an adjustableV feed-eccentric 25 mounted on the main shaft 5, embraced by an axially shiftable strap 26 which is adapted to be entered by a pin 21. The pin 21 is formed or otherwise provided at its lower end with an eccentric portion 28 which is adjustably secured by means of the screw 29 in the apertured ear 30 provided on the feed-frame I1. Adjustment of the eccentric portion 28 regulates the position of the needle relative to the axis of the loop-taker shaft I0. The eccentric 25 may be adjusted to vary the feed by means of the knob 3| in a manv `through the medium of the axis-screw frame ner well known, and fully shown and disclosed in the U. S. patent to W. F. Dial et al., No. 718,988, January 27, 1903. For a more complete disclosure of the present sewing machine mechanism reference may be had to the U. S. patent to Albert Rontke, No. 989,538, April 1l, 1911.

Pivotally mounted upon the feed-bar 23 on a screw 32 disposed forwardly of the axis I9 of oscillation of the feed-frame l1, is the supporting bar or base 33 for a work-guide in the form of a transverse binder 35 adjustably secured to said supporting bar 33 by screws as 36. The -axisscrew 32 is secured directly in the feed-bar 23. The cloth-plate 3l secured directly to the bed l, carries by means of screws 38, a stationary bracket 39 which is provided with a fulcrum-pin 4B. A slightly elongated aperture 4l provided in the bar 33 receives the fulcrum-pin 40 about which the bar 33 and consequently the binder 35 swings when actuated by the feed-frame Il It is to be understood, therefore, that `since the axisscrew 32 is secured 4to the feed-bar, the axisscrew yreceiving portion or thatendof'the bar-'33 remote from the feed-dog 24, will Voscillate substantially in unison with said ,feed-bar. The for- `ward portion of the-bar 33,-.ea-rrying the `binder 35 will, because of the position of the fulcrum- `pin d, `oscijllate in opposition -to the direction of feed-dog movements.

rlhe strip guide herein shown is .of that well 4known type styled the English` binder, but it is to be understood that the :invention is not limited `to'this -type of work-guide. It will be observed that the binder-head is Vpartially cut vaway to perxmit positioning it closelyad-iacent fat the needle Yl 5 `when the binder is oscillated to its extreme position in the direction of work-feed.

Moving laterally with the feed-dog 24! is the top -feed-foot 42 Ycarried by `the feed-foot rbar 43 journaled for vertical movement in vthe feedill. The vertical reciprocations of the feed-'foot l2 alternate with like movements of the presser-foot 44, the alternate reciprocations of 'these elements being caused Yby mechanism such as fully shown and described in the vpatent to Rontke, No. 989,538, before referred to or by any other suitable' mechanism of a like character which is Ywell known in 'the art. The feeding foot f4?. lis'partly cut away as at 4S-to 'permit the close adjustment of the binder relative to the needle. The binding tape 46 lis led-from va suitable supply source to the binder 35 which folds the tape about the edge of a body material 41 as best shown in Fig. 6. Fig. 7 illustrates .a cross isection through the finished product showing 'the relative positions of the body-material 47, the tape 4G, a backing tape 4B and the stitches 43. The backing is also guided by the binder 35.

In the operation of the :sewing machine and `during thefeeding movementof the needle, the -binding is held `rby the needle 'positively in position upon 'the ,margin v'of v the body-fabric, the feed-foot 42contacting'with the work andthe presser-foot -M being raised. The Work vis Ithus clamped between the lower feed-dog 213 and :the upper feed-foot ft2, and these elements with .the needle -move -in unison to feed the work while the binder 'is moved oppositely to these movements' thereby drawing a :length of binding through the binder duringthe'Work-advancing movement -of lthe feeding instrumentalities. During'the return movements of the feed, 'the ifeedfoot ft2 y-i-s raised; the ypresser-footllll engages'the wor-k and lthe 'binder vibratestoward the feeding instrumentalities before the work-feeding needle penetrates the work. This forward movement of the binder has the effect of relaxing the binding tension induced by the action of drawing said binding through the binder. The needle now pierces the work including the binding which is unstretched and hence does not `pucker the body fabric. The stitches are thus produced in the tape when it is in a normal and untensioned condition. It is to be understood therefore, that although tension is induced in the binding when the feeding mechanism is advancing the work and the binder is vibrating in a direction opposite to the feeding movements, this tension can in no way effect that portion of the work being stitched as it is positively clamped by the feeddog, feed-foot and the needle.

The present machine therefore is particularly adapted for sewing binding tapes and the like work having elastic properties as it provides a positive control over the lwork at all times, and due to its novel action it obviates the -puckering eect `incidental to stitching -a tensioned elastic tape to a body fabric.

Having thus set forth 'thenature of the invention what we claim herein is:

l. In a sewing machine, the combination with an endwise reciprocating needle, an upper feedfoot, means to impart feed-and-return -move- 'ments to said yneedle and said upper feed-foot, a

lower feed-dog, rand means lfor actuating vsaid lower feed-dog in synchronisrn with said upper feed-foot, of :a work-guideandmeans for actuating said work-guide in opposition to the feedand-return movements imparted to said upper feed-foot.

2. In a sewing machinathe combination with an endwise reciprocating vand laterally movable needle, and means Ifor imparting said movement-,s to the needle, `of a work-guide, and means for actuating said work-guide in opposition to said lateral movements of the needle.

3. In a -sewing machine, nin combination, a -needle, means for endwise reciprocating said needle, a feed-dog, a binder, and means for imparting lateral kmovements -to said need-le -and feed-andreturn movements to Vsaid feed-dog whereby the lateral movements `of said needle and `the feedand-return .movements of said feed-dog remain substantially `in parallelism, lsaid last named means imparting bodily movements to said binder in opposition to the feed-and-return movements imparted to said feed-dog.

4. In a sewing machine, in combination, an endwise reciprocating needle, a rotary shaft `for reciprocating said needle, -a feed-dog, means .connected to said rotary sha-ft `for imparting feedand-return movements to 'said feed-dog, a workguide, and vconnections intermediate -said lmeans and said work-guide 'for `imparting bodily movements -to said work-guide in 'opposition '-to the feed-.and-return :movements imparted to said feed-dog.

5. In a sewing machine, in combination, an endwise reciprocating needle, means `for reciprocating said needle, imeans for imparting lateral movements to said needle, a feed-daga feeddog actuating -means 'to 'impart feed-'and-return guide in opposition to those movements imparted to said feed-dog.

6. In a sewing machine, in combination, a frame, a feed-dog, feed-actuating mechanism to impart a work-advancing stroke to the feed-dog during its cycle of operations, a work-guide, stationary means carried by said frame, said workguide pivotally engaging said stationary means, and means connecting said feed actuating means and said work-guide for shifting the saine about said stationary means in a direction opposite to the direction of feed of the work-passing through said work-guide during the work-advancing stroke of the feed-dog.

7. In a sewing machinel in combination, a frame, a feed-dog, feed-actuating mechanism to impart feeding movements to said feed-dog, a bar sustained by and disposed substantially 1ongitudinally of said frame, a work-guide secured upon the end of said bar adjacent to said feeddog, means connecting said feed-actuating mechanism with the end of said bar remote from said feed-dog for actuating that end of the bar in unison with said feed-dog, and stationary fu]- crum means carried by said frame, said bar member pivotaily engaging said stationary fulcrum means at a point on the bar between said feeddog and said end of the bar remote therefrom.

8. In a sewing machine, in combination, a frame, work-feeding mechanism having a workadvanoing stroke during its cycle of operation, a base bar sustained by said frame, a work-guide secured upon one end portion of said base bar, stationary means carried by said frame, said base bar pivotally engaging said stationary means at a point between the ends of said bar, and means connecting said work-feedingy mechanism with the end of said bar remote from said workguide for actuating said Work-guide in a direction opposite to the direction of feed of the work and during the Work-advancing stroke of f said work-feeding mechanism.

HENRY C. NISSEN. JAMES E. ACKERMAN.

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