US2474282A - Top feed and alternating presser attachment for sewing machines - Google Patents

Description

June 28, 1949. R. J. SAILER TOP FEED AND ALTERNATING PRESSER ATTACHMENT FOR SEWING MACHINES 2 Sheets-Sheet 1 Filed Nov. '7, 1947 Ill/Ill) cS'az'Zez 5r.

WITNESS ATTORNEY June 28, 1949. R. J. SAILER 2,474,282

TOP FEED AND ALTERNATING PRESSER ATTACHMENT FOR SEWING MACHINES Filed NOV. 7, 1947 2 Sheets-Sheet 2 min Patented June 28, .1949

TOP FEED AND ALTERNATING PRESSER ATTACHMENT FOR SEWING MACHINES Rudolph J. Sailer, Townley, N. J assignor to The 1 Singer Manufacturing Company, Elizabeth, N. 3., a corporation of New Jersey Application November 7, 1947, Serial No. 784,596

6 Claims.

This invention relates to top feed and alternating presser attachments for sewing machines.

Certain materials, such, for example, as rubberized fabrics, imitation leather and the various thermoplastic sheet materials more or less recently developed, have adherent characteristics. Therefore, when two plies of such material are passed through a conventional sewing machine, to be united, the upper ply tends to adhere to the underside of the presser-foct and to drag, while the lower ply is positively advanced by the underlying feeding mechanism. This results in distortion and puckering of the material and consequently in the production of uneven and imperfect work.

Specially designed machines embodying top feed and alternating presser mechanisms heretofore have been provided for the manufacturing trades for handling materials of this nature and also for handling extra heavy materials in the sewing of which, on conventional sewing machines, the upper ply tends to lag behind the positively fed lower ply. However, insofar as I am aware, no satisfactory and commercially practicable device heretofore has been provided for ready attachment to regular family sewing machines to overcome the difficulties encountered when attempting to sew materials having adherent characteristics, or work which is unusually thick and heavy. Thereover, in many instances, it has heretofore been necessary to initially baste the plies together before they could be united by a regular family sewing machine.

This invention has as a primary object to provide an improved device adapted to be removably attached to family sewing machines, in place of the usual presser-foot, to facilitate the feeding of the work through the machine and thereby obviate the necessity of initially basting the plies together and to prevent drawing or puckering of the work.

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 which the 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 a fragmentary end view of a portion of a family sewing machine, partly in section, showing the improved attachment secured to the presser-bar thereof, with the needle-bar in its uppermost position, with the presser-foot raised, and with the lowerfeeding mechanism and an upper feeding foot in position to start their workfeeding movements.

Fig. 2 is a view similar to Fig. 1 but with still further portions of the. machine omitted, with the needle-bar partially down and with the feeddog and upper feeding foot at the end of their feeding movements.

Fig. 3 is a View similar-to Fig. 2, but taken from the opposite side, with the needle-bar in its lowermost postion with the presser-foot bearing upon the work, the feeding f-oot raised and spring returned to its forwardmost position, as in Fig. 1.

Fig. 4 is a front viewof the attachment and portions of the sewing machines, with the parts in the position shown in Fig. 1.

Fig. 5 is rear view of Fig. 4.

Fig. 6 is an enlarged plan viewof the improved attachment apart from the sewing machine.

Fig. '7 is an enlarged vertical sectional view taken substantially on "the line A-A of Figs. 3 and6.

Fig. 8 is a disassembled perspective view of the principal elements of theimproved attachment.

Fig. 9 is an enlarged. detail sectional view taken substantially on the line B B of Fig. 5.

Referring more specifically to the drawings, Figs. 1 to 5, inclusive, show the improved attachment as applied to a conventional family sewing machine comprising a base I having a horizontally disposed work-supporting plate 2 which includes the usual throat-plate 3'slotted, at 4, to accommodate a feed-dog 5 secured upon a horizontally disposed feed-bar -6. The feed-bar and the feed-dog'carried thereby are given feed and return movement by an oscillating feed rocker and rising and falling movements by a rock-arm 8 carried by an oscillatory feed-lift rock shaft 9.

Located above the work-supporting plate 2, and spaced therefrom, is theusual bracket-arm head H) in which is mounted, for endwise reciprocation, a needle-bar I I carrying, at its lower end, an eye-pointed thread-carrying needle l2 which cooperates with a suitable loop-taker, not shown, in the formation of stitches. Also mounted in the head H) is a spring-depressed presser-bar l3, having a flattened lower end portion M, towhich, in conventional family sewing machines, there is usually clamped a presser-foot generally similar to that shown in United States Patent No. 2,031,562, Feb. 18, 1936,0f'H. J. Goosman.

The present invention contemplates the removal ofthe' conventional presser-foot and the bodily substitution therefor of an improved alter.

3 nating presser attachment having both a presserfoot and a feeding foot.

The improved attachment preferably comprises a sheet metal supporting frame 15, substantially U-shaped in plan view, having, at its lower end, a horizontal L-shaped portion 16 (Fig. 6) adapted to be fitted to the flattened lower end portion 14 of the presser-bar and to be secured thereto by a knurled and slotted screw 17, the threaded end of which passes through an aperture I8 in the portion i6 and is threaded into the usual presser-foot screw hole id in the presserbar.

The frame 15 is formed with a back wall and two laterally spaced and vertically disposed side walls 2! and 22 adapted to support, respectively, a feeding element, comprising a shank 23 and a feeding foot 24 pivotally connected thereto, at 24 and a presser-member including a shank and a rigidly connected presser-foot 26. Se-

cured to the back wall 20 of the frame 15, as by screw 2'! and pins 28, is a bracket 29, which is substantially U-shaped in plan view and has, at one side, a forwardly projecting arm 31! and, at the opposite side, a vertically disposed wall 3i. The shank 23 of the feeding foot 24 is pivotally mounted, at its upper end, on a shoulder screw 32 threaded into an aperture 33 in the wall 2! of the frame i 5. Below its pivot, the shank 23 is formed with an off-set ear 34, slotted at 35, to afford clearance for the forward end of the arm 3B which projects therethrough. A coil spring 35, surrounding the arm 30, has its rear end bearing against a shoulder 37 provided by the bracket 29 and its forward end bearing against the rear surface of the ear 34. Thus the spring normally biases the shank 23 and the feeding foot 24 forwardly to the position shown in Figs. 1, 3 and 6 in which the shank 23 bears against an abutment, preferably in the form of a laterally offset stop lug 33 provided by the wall 2| of the frame 15.

The shank 25 of the presser-foot 26 is slidingly mounted, for vertical movements, on the outer face of the wall 22 of the frame 45, by means of shoulder screws 39, passing through slots 40 in said shank and threaded into apertures 4| in said well. The shank 25 and the foot 26 are normally urged upwardly, to a position in which the lower walls of the slots :58 engage the undersides of the screws 39, by a spring 42 located at the rear side of the attachment. This spring has a coiled portion which surrounds an adjustable collar 44 adapted to be held in adjusted position by a clamp screw 45 threaded into an aperture 29 in the bracket 29 (Fig. 9). The spring 42 has one offset leg 42 which enters an aperture in the collar 44 and another offset leg 42 which enters an aperture 46 formed in an ear 46 on the shank 25. The tension of the spring 42 may be varied by loosening the clamp screw 45, turning the collar 44 until the desired tension is obtained and again tightening the clamp screw.

Pivotally mounted at the inner face of the wall 3i of the bracket 29, by a shoulder screw 47, passing through an aperture 3 I in said wall 3! is an actuating arm 43 having a cam surface 4i; adapted to engage the upper side of a tang 25 struck outwardly from the shank 25.

Upward movement of the shank 25 under the influence of the spring 42 acts, through the pressure of the tank 25 on the arm 48, to shift the lever to its uppermost position.

The needle i2 is secured to the lower end of the needle-bar i l by means of a conventional needleclamp similar to that shown in United States patent of A. Grieb, No. 1,896,047, Jan. 31, 1933, and comprising a clamping band 49 having a neck portion 49*, and a clamp screw 52 threaded through said neck portion. The needle-clamp is, in effect, a portion of the needle-bar. As shown most clearly in Figs. 3 and 4 the neck portion of the needle-clamp overlies the arm 48. Therefore, at each down stroke of the needle-bar, the neck portion 49 swings the arm 48 downwardly to the position shown in Fig. 3. During this downward movement of the lever the cam portion 48 thereof acts on the upper side of the tang 25* and forces the shank 25, and the presser-foot 26 carried thereby, downwardly in opposition to the spring 42.

With the parts in the position shown in Fig. l, i. e. with the needle-bar in its uppermost position, the feed-dog 5 has risen through the slot 4 in the throat-plate and has engaged the under ply of the work W. The presser-foot 26 is lifted above the work and the feeding foot 24 is hearingdown on the upper ply of the work, under the pressure of the conventional presser-bar spring, not shown. Thus, both plies of the work are clamped between the upper and lower feeding elements so that there is substantially no possibility of relative movement between the plies. During the downward movement of the needle-bar to the position illustrated in Fig. 2, the feed-dog 5 advances the work one stitch length in the direction indicated by the arrow F. The downwardly depressed feeding foot 24 moves with the work, holding the two plies together and therefore assists in the feeding of the work. The pivotal connection 24 between the foot 24 and the shank 23 permits the sole portion 24 of the foot to maintain complete surface contact with the work during the entire feed movement. As the foot 24 moves rearwardly, in opposition to the spring 36,

the shank 23 thereof swings about the pivot screw 32. During the downward movement of the needle-bar and movement of the feed elements from the position shown in Fig. 1 to that shown in Fig. 2, the needle-bar swings the arm 48 downwardly which, in turn, depresses the shank 25 of the presser-foot 26, in opposition to the spring 42, as above described, until the bottom surface of the presser-foot is only slightly above the upper surface of the work. A slight further downward movement of the needle-bar causes the arm 48 to force the presser-foot into pressure contact with the work to clamp the work stationary on the throat-plate. As the presserfoot is lowered into contact with the work, the feed-dog 5 is dropped below the surface of the throat-plate preparatory to its return movement. During further downward movement of the needle-bar, i. e. to the position shown in Fig. 3, the arm 48 is forced still further down, but as further downward movement of the presser-foot is prevented, by its contact with the work, action of the cam 48* on the then stationary tang 25 causes the lever to react and exert an upward thrust on the screw 47 which lifts the bracket 29, carrying with it the frame 20 and the presserbar H to which it is secured. Upward movement of the frame 20 lifts the feeding foot 24 clear of the work whereupon the spring 36 swings the shank 23 forwardly and into contact with the stop lug 38, thereby returning the feeding foot to the position shown in Fig. 3. As the needlebar is moved upwardly from the position shown in Fig. 3 the spring 42, acting on the shank 25, lifts the presser-foot 26 and the arm 48 thereby permitting the presser-bar spring, not shown, to lower the feeding foot 24 onto the work, thus returning the parts to the starting position shown in Fig. 1.

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

1. An attachment of the class described, comprising a supporting frame adapted to be secured to the presser-bar of a sewing machine and having spaced vertically disposed walls; a feeding member horizontally pivoted on one of said walls; a presser-member slidingly mounted on the other of said walls for vertical movement; a bracket secured to said frame; a spring mounted on said bracket and engaging said presser-member and urging it upwardly; a needle-bar-actuated arm pivoted to said bracket and engaging a portion of said presser-member to force it downwardly in opposition to said spring; and a second spring interposed between said bracket and said feeding member and normally urging said feeding member forwardly.

2. An attachment of the class described, comprising a supporting frame, substantially U- shaped in plan view, adapted to be removably secured to the presser-bar of a sewing machine and having spaced vertically disposed walls, one of which is formed at its forward edge with a stop lug; a feeding member horizontally pivoted on one of said walls; a presser-member slidingly mounted on the other of said walls for vertical movement; a bracket secured to said frame; a spring mounted on said bracket and engaging said presser-member and urging it upwardly; a needle-bar-actuated arm pivoted to said bracket and engaging a portion of said presser-member to force it downwardly in opposition to said spring; and a second spring interposed between said bracket and said feeding member and normally urging said feeding member forwardly into contact with said stop lug.

3. An attachment of the class described, comprising a supporting frame adapted to be removably secured to the presser-bar of a sewing machine and having a back wall and spaced vertically disposed side walls, one of which carries an abutment; a feeding member horizontally pivoted on one of said side walls; a pressermember slidingly mounted on the other of said side walls for vertical movement; a bracket secured to the back wall of said frame and having a forwardly projecting arm at one side of said frame and an upright wall at the opposite side thereof; a spring mounted on said bracket and engaging said presser-member and urging it upwardly; a needle-bar-actuated arm pivoted to said bracket and engaging a portion of said presser-member to force it downwardly in opposition to said spring; and a second spring mounted on the arm of said bracket and normally urging said feeding member forwardly into contact with said abutment.

4. An attachment of the class described, comprising a supporting frame adapted to be secured to the spring depressed presser-bar of a sewing machine and havin spaced vertically disposed walls one of which carries an abutment;

a feeding member having a shank horizontally pivoted on said one of said walls and provided with a slotted offset ear; a feeding foot pivoted to the lower end of said shank, said feeding foot normally being depressed upon a workpiece by the presser-bar; a spring-lifted presser-member slidingly mounted on the other of said walls for vertical movement; a bracket secured to said frame and having an arm, the forward end of which projects through the slot in said ear; a spring mounted on said arm and having one end bearing against said bracket and its other end bearing against said ear and normally urging said shank into contact with said abutment; and a needle-bar-actuated arm pivoted to said bracket and engagin a portion of said presser-member to force it downwardly into pressure contact with a workpiece beneath the feeding foot and to lift said feeding foot out of contact with the workpiece.

5. An attachment of the class described, comprising a supporting frame adapted to be secured to the presser-bar of a sewing machine and having spaced vertically disposed walls; a

. feeding member horizontally pivoted on one of said walls; a presser-member slidingly mounted on the other of said walls for vertical movement; a bracket secured to said frame; a collar adjustably mounted on said bracket; a spring secured to and carried by said collar and having an offset leg engaging said presser-member and urging it upwardly; means for adjusting said collar on said bracket and maintaining it in its adjusted positions, to vary the tension of said spring; a needlebar-actuated arm pivoted to said bracket and engaging a portion of said presser-member to force it downwardly in opposition to said spring; and a second spring interposed between said bracket and said feeding member and normally urging said feeding member forwardly.

6. The combination with a sewing machine having a work-support provided with a feed slot, a reciprocating needle-bar, a spring-depressed presser-bar and a lower feeding mechanism located mainly below said work-support and having a feed-dog operating through said feed slot and engaging the underside of a workpiece on said work-support; of a top feed and alternating presser device secured to said presser-bar and cooperating with said lower feeding mechanism to effect feeding of said workpiece, said attachment comprising a supporting frame; an upper work-feeding member including a shank pivotally supported on said frame and carrying, at its lower end, a pivotally supported feeding foot having a sole portion which bears fiatwise upon the upper side of the workpiece above said feed-dog during the entire feed movement of the work by said feed-dog; a presser-member slidingly mounted on said frame; a spring means normally urging said presser-member upwardly; and a member supported by said frame and actuated by said needle-bar to effect alternate raisin and lowering of said feeding foot and presser-member.

RUDOLPH J. SAILER.

No references cited.

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