US2419482A - Presser device for sewing machines - Google Patents

Description

April22,1947. CLAYTON 2,419,482

PRESSER DEVICE FOR SEWING MACHINES Filed Oct. 20; 1945 2 Sheets$heet 1 Wi/rwm 3, M .i j W u ndrew 5. czw m April 22,- 1947. A. B. CLAYTON 9,

PRESSER DEVIIGEYFOR SEWiNGMACHINES Filed Ot. 20,- 1945 2 Sheets-Sheet 2 @W/mebw Patented Apr. 22, 1947 2,419,482 PRESSER DEVICE FOR SEWING MACHINES Andrew E. Clayton,

Elizabeth, N. 1., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a. corporation of New Jersey Application October 20, 1945, Serial No. 623,585

14 Claims.

This invention relates to sewing machines of the type in which an endwise movable presser-bar is inclined relative to the work-supporting surface of the machine and more particularly to an improved presser device for sewing machines of that type.

The invention has as an object to provide a presser device for sewing machines in which the presser-foot proper may, under the influence of the feed-dog or the usual presser lifter, be caused to move in a path other than the path of movement of the presser-bar.

Stated more specifically, the invention has as an object to provide, in a sewing machine having a horizontally disposed work-support and an upwardly and rearwardly inclined presser-bar, a presser-device operatively connected to the lower end of the presser-bar and adapted to be moved substantially perpendicularly to the upper surface of the work-support during the rise and fall of the feed-dog, thereby nullifying any tendency of the presser-foot to shift the work in a direction opposite to the normal directionof feed of the Work.

Another object of the'invention is to provide an improved presser device in which the path of movement of the presser-foot may be varied.

Still another object of the invention is to pro-. vide, in a sewing machine, an improved supporting means for a presser device whereby the presser device may be adjusted bodily in the line of scam formation.

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 of the invention, from whichthe several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings,

Fig. 1 is an end view of a sewing machine embodying the present invention, with the usual face-plate:removed from the machine- Fig. 2 is a rear side elevation, on a reduced scale, of a portion of the machine, showing more particularly the manually actuated presser-foot lifting means.

Fig. 3 is an enlarged side view of the improved presser-device in a position of adjustment in which the presser-foot is given one path of movement.

Fig. 4 is a view similar to Fig. 3, with the presser-device adjusted to a position which effects a different path of movement of the presser-foot.

Fig. 5 is a sectional view taken on the line 5-.-5

of Fig. 3. Fig. 6 is a view looking in the direction indicated by the arrow A in Fig. 3, with the needlebar and needle omitted and with the throat-plate and feed-dog indicated in section.

Fig. 7 is a View illustrating more clearly the path of movement of the presser-foot when the parts are in the position illustrated in Fig. 3.

Referring more specifically to the drawings, the invention is disclosed as embodied in a sewing machine having a frame including a worksupporting plate 2, a standard 3 and a bracketarm a terminating in a bracket-arm head 4-. Mounted for endwise reciprocation in bushings d in the head 4 is a needle-bar 5 carrying an eye-pointed needle 6 which cooperates with a loop-taker in the formation of stitches. The work is advanced through the machine by a conventional four-motioned feeding mechanism, including a feed-bar 8 carrying a serrated feeddog 9 operating through slots in a throat-plate is carried by the plate 2 and constituting a part of the work-support. Means, designated generally as f, is provided for giving to the feed-bar and the feed-dog carried thereby, their feed and return movements in synchronism with the up and down movements thereof, which are effected by mechanism designated generally as 9.

Also mounted in the head 4 and secured therein by a screw H, is a bushing l2 the lower portion of which projects below the lower end of the head. A presser-bar I3 is slidingly mounted in the bushing l2 and is normally held depressed by a coil spring |4 seated at one end against a shoulder l5 provided by the presser-bar and at its other end against a spring-adjusting element I6 threaded into the upper portion of the bracketarm head. Secured to the presser-bar I3, within the head 4*, is a collar having a rearwardly extending arm I8 fitted in a slot l9 in the head. The under surface of the arm I8 is adapted to be engaged by the inwardly extending lower limb of an L-shaped lifter element 2.0 pivotally connected, at its upper end, to one arm 2| of a presser-lifting lever 2| fulcrumed on a shoulder screw 22 threaded into the rear wall of the bracket-arm 4 (Fig. 2). A spring 23, coiled about the hub of the lever 2| and having one arm 23 secured in the bracket-arm and the other arm 23 engaging the lever arm 2 l normally serves to bias the lever 2| to the position shown in full lines in Fig. 2. The other arm 2| of the lever 2| is connected by a chain 24, or other suitableelement,

to a conventional treadle mechanism, not shown. Thus manipulation of the treadle will, through the elements 24, 2|, 20, I8 and [1, effect upward movement of the presser-bar I3 in opposition to the spring M.

As shown in Fig. 1, the presser-bar is inclined relative to the upper surface of the work-supportin plate 2. Therefore, when the machine is placed upon a supporting table with the worksupport in a horizontal plane, the presser-bar,

will be upwardly inclined rearwardly as shown in Fig. 1. For certain purposes it may be desirable to suport the machine on an inclined table with the work supporting surface of the machine upwardly inclined rearwardly and with the presser-bar arranged vertically. In either setting of the machine the presser-bar will be inclined relative to the work-supporting surface of the machine.

Cooperating with the feed-dog 9 and throatplate It), in the feeding and holding of the work, is a presser-foot 25 supported indirectly from the presser-bar IS. The sole portion of the presser-foot normally bears upon the upper surface of the work and is adapted to be lifted, in opposition to the spring M, by the upward movement of the feed-dog and to be depressed by the spring when the feed-dog is lowered. For certain purposes, and under certain working conditions, it is. desirable that the movement of the presserfoot be substantially perpendicular to the upper surface of the work-support and not parallel to the axis of the presserbar. It may also be desirable to vary the path of movement of the presser-foot.

This invention has, therefore, provided an improved supporting means for the presser-foot, whereby the path of movement of the presserfoot may be independent of and diiferent from the path of movement of the presser-bar. This means comprises an L-shaped bracket 26 having a split portion 27 surrounding the presser-bar bushing I2 and adjustably secured thereto by a clamp screw 28. The lower end of the presserb'ar is bifurcated, as shown at 29, and has fitted therein a plate-like shank member 36, to the lower end of which the presser-foot 25 is pivotjally mounted, as by a pin 3|. Intermediate the furcations of the presser-bar, the shank 3% is formed with an aperture 32 in which is fitted a roller stud 33 journaled upon a screw 35 carried by the presser-bar. By reason of this construction, the shank 30 moves up and down with the .presser-bar but is free to move edgewise relative thereto.

. The bracket 26 has a depending portion 26 located rearwardly of the presser-bar, and to which are pivotally connected, by screws 35, the rear ends of a pair of parallel links 36. The forward ends of the links 36 are pivotally connected, by screws 31, to the rear portion of the shank member 39.

L To facilitate manufacture and to afford bodily adjustment of the shank 30 and the presserfoot 25 carried thereby, in the line of seam formation, the bracket 26 is preferably made in two parts and means is provided for adjusting one part on the other. As illustrated in the drawing, the portion 2! of the bracket 2'3 has formed integrally with it a rearwardly projecting arm 2'5 formed, in its side face, with a groove 21". The depending limb 26 of the bracket is provided, at its upper end, with an off-set arm 26' having a lateral rib 26, adjustably fitted into the groove 2l -inthe arm 21 and alongitudinal slot 26 4 extending lengthwise of the arm. A clamp screw ill, having its shank passed through the slot 25 and threaded into the arm 21 holds the arm 26* in various positions of adjustment on the arm 21 By reason of this construction, the limb 26 of the bracket 2'5, the links 36, the shank member 30 and the presser-foot 25 are all adapted to be shifted bodily in the line of seam formation. This adjustment may be used to correct for any slight variations or inaccuracies in the parts, to vary the position of the toe of the presser-foot relative to certain atachments with which sewing machines are commonly fitted, or for any other purpose.

In Figs. 1 and 3, the bracket 26 is shown as adjusted upwardly on the bushing 12 to a position in which the bracket closely underlies the bracket-arm head 4 In this position of adjustment of the bracket, the up and down movements given to the presser-foot and the shank 3!], with the rise and fall of the feed-dog 9, causes the links 33 to be swung about the pivot screws 35 to opposite sides of planes 10 parallel to the upper surface of the work-support. Thus the shank 39 and the presser-foot carried thereby are moved substantially perpendicular to the worksupporting surf-ace, thereby avoiding any tendency for the presser-foot to shift the work toward the operator in the downward movement of the foot.

In Fig. 7 the entire path of movement of the presser-foot, under the influence of both the feed-dog and the manually actuated presser-fo-ot lifter, is indicated by the dot-dash line 1. That portion thereof which is efiected by the rise and fall of the feed-dog is designated as 1/, which, as above pointed out, is substantially perpendicular to the work-supporting surface of the machine.

When the presser-bar is lifted by the manually actuated lifting mechanism hereinbefore described, the presser-foot is lifted to its uppermost position as indicated in dotted lines in Fig.

3 and in dot-dash lines in Fig. 7.

Under certain conditions, it may be desirable to have the presser-foot move in a path approximating the path of movement of the presser-bar. The above described construction is also adapted to meet this condition. As shown in Fig. 4, the bracket 26 may be adjusted downwardly on the bushing l2 and secured thereto at a substantial distance from the lower end of the bracket-arm head. With the bracket so adjusted, the rear pivots 35 of the links 36 are located substantially below the forward pivots 31 and therefore the path of movement of the presser-foot will be as indicated by the heavy dotted line 2 in Fig. 4.

Having thus set forth the nature of the invention what I claim herein is:

1. In a sewing machine having a frame, a worksupport, and an endwise movable presser-bar inclined relative to the work-support; a bracket supported by said frame and having a portion located at one side of the axis of the presser-bar; a pair of links'pivotally mounted at one end on said portion of the bracketya shank member pivotally attached to the other ends of said links and having an operative connection with said presser-bar; and a presser-foot carried by said shank member.

2. In a sewing machine having a frame including a bracket-arm head, a bushing in said head, a work-support, and an endwise movable presserbar mountedin said bushing and inclined relative to the work-support; a bracket, supported-by said bushing and having a portion located atone side ofthe axis of the presser-bar; a pair of links pivotally mounted at one end on said portion of the bracket; a shank member pivotally attached to the other ends of said links and having a sliding pivotal connection with said presser-bar; and a presser-foot secured to said shank member.

3. In a sewing machine having a frame including a bracket-arm head, a bushing secured in said .head and having a portion projecting therebeneath, a work-support, and an endwise movable presser-bar mounted in said bushing inclined relative to the work-support; a bracket secured upon the projecting portion of said bushing and having a portion located rearwardly of the presser-bar; a 'pair of parallel links pivotally 'mounted at one end on said portion of the bracket; a shank member pivotally attached to the other ends of said links and having a sliding pivotal connection with said presser-bar; and a presser-foot secured to said shank member.

4. A sewingmachine combining a frame including a bracket-arm head; a bushing secured in said head and having a portion projecting 'therebeneath; a work-support; an endwise movable presser-bar mounted in said bushing and inclined relative to the work-support, said presser-bar having a bifurcated lower end projecting below said bushing; a bracket secured upon the projecting portion of said bushing and having a portion located rearwardly of the presser-bar; a pair of links pivotally mounted at one end on said portion of the bracket; a plate-like shank mem-' ber pivotally attached to the other ends of said links and having a portion extending between the furcations of the presser-bar and provided with a slot; a stud carriedby said furcations and passing through said slot; and a presser-foot secured to said shank member.

5. In a sewing machine having a frame including a bracket-arm head, a bushing secured in said head and having a portion projecting therebeneath, a work-support, and an endwise movable presser-bar mounted in said bushing and inclined relative to the work-support; an inverted L- shaped bracket having its upper limb adjustably mounted on the projecting portion of said bushing for vertical adjustment and having its other limb depending from said upper limb and located rearwardly of the presser-bar; a pair of 7 parallel links pivotally mounted on the depending limb of the bracket; a shank member pivotally attached to the other ends of said links and having a stud and slot connection with said presser-bar; and a presser-foot pivotally secured to said shank member.

6. A presser device for a sewing machine having an endwise movable presser-bar; comprising a bracket adapted to be secured to a fixed portion of the machine, a pair of links pivotally connected at one end to said bracket, a shank member pivotally attached to the other ends of said links, means for connecting said shank member to the presser-bar, and a presser-foot carried by said shank member.

7. A presser device for a sewing machine having a bracket-arm head, a bushing in said head, and an endwise movable presser-bar mounted in said bushing; comprising an inverted L-shaped bracket adapted to be secured to said bushing, a pair of substantially horizontal parallel links pivotally connected at their rear ends to said bracket, a shank member pivotally attached to the forward ends of said links, means for connecting said shank member to the presser-bar for vertical movementtherewith, and apresser foot secured to said shank member. 1

8. Apresser device for a sewing machine having abracket-arm head, a bushing in said head, and'an endwise movable presser-barmounted in said bushing; comprising an inverted L-shaped bracket the upper limb of which is formed as a collar adapted to be secured upon said bushing, a pair of links pivotally connected at one end to the lower limb of said bracket, a plate-like shank member pivotally attached to the other ends of said links, means for connecting said shank member to the presser-bar, and a presser-foot pivotally secured to said shank member.

9. In a sewing machine having a frame including a bracket-arm head, a work-support, a work-feeding mechanism including a four-motioned'feed-dog operating through said worksupport, and an endwise movable presser-carrying bar mounted in said bracket-arm head and inclinedrelative to the work-support; a presserdevice including a shank member and a presserfoot carried thereby and normally bearing upon the upper surface of the work to hold the work on the work-support; means connecting said shank member to said presser-carrying bar to permit movement of the shank member relative to the bar; and means engaging said shank member and rendered effective by the rising and falling movements of the feed-dog to cause the presser-foot to move substantially perpendicular to the work-support.

10. In a sewing machine having a frame including a bracket-arm head, a work-support, a work feeding mechanism including a four-motioned feed-dog operating through said worksupport, and an endwise movable presser-carrying bar mounted in said bracket arm head and inclined relative to the work-support; a presserdevice including a shank member and a presserfoot carried thereby and normally bearing upon the upper surface of the work to hold the work on the work-support; means connecting said shank member to said presser-carrying bar to permit movement of the shank member relative to the bar; and means connected with said shank member for causing bodily movement thereof relative to the pressure-carrying bar when the presser-foot is moved by the feed-dog,

11. In a sewing machine having a frame, in combination, stitch-forming mechanism; workfeeding mechanism; a spring-depressed presserbar mounted in said frame for endwise movement; a two-part bracket supported by said frame and having one party thereof adjustably mounted on the other part; a presser-device, including a shank member attached to the adjustable part of the bracket and operatively connected with the presser-bar to be moved thereby and a presser-foot carried by said shank member; and means to adjust the adjustable part of the bracket and said presser-device bodily in the line of seam formation and to secure them in their adjusted position.

12. In a sewing machine having a frame including a bracket-arm head, in combination, a stitch-forming mechanism; work-feeding mechanism; a bushing mounted in said head and having a portion thereof extending therebeneath; a spring depressed presser-bar mounted in said bushing for endwise movement; a bracket having a first arm secured to the projecting portion of said bushing and a second arm adjustably mounted on the first arm and extending downwardly therefrom; a pair of links pivotally mounted at one end on said second arm; 'a shank member pivotally attached to the other ends of said links and having a sliding connection with the presser-bar; a. presser-foot carried by said shank member; and means to adjust said second arm, links, shank-member and presser-afoot bodily relative to said first arm in the line of seam formation and to secure them in their adjusted position.

13. In a sewing machine having a frame including a bracket-arm head, in combination, stitch-forming mechanism; work-feeding mechanism; a spring-depressed presser-bar mounted in said bracket-arm head for endwise movement; an inverted L-shaped bracket comprising a first arm connected with said head and projecting rearwardly from said presser-bar in a direction substantially parallel to the line of seam formation, a second arm depending from said first arm and adjustably secured thereto for bodily adjustment lengthwise of the first arm and means to secure said arms together, in adjustedpositions; a shank member attachedlto said second arm and adjustable bodily therewith and havi g an operative connection with the presser-bar; anda ,presser-foot carried by said shank member. s

14. A presser device for a ewing machine having an endwise movable presser-bar; comprising an inverted L-shaped bracket including ,two arms, one of which is adapted to be secured to a fixed portion of the machine and to project rearwardly from aid presser-bar in a direction substantially parallel to the line of seam formation of the sewing machine, and a second depending arm mounted on'the first arm'for adjustment lengthwise of the first arm; a pair of links pivotally connected at one end to said second arm; a shank member pivotally, attached to the other ends of said link 'and having means to:connect it with the presser-bar; and a presser-foot, car- 20 ried by said shank member.

' ANDREW. B. CLAYTON.

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