US1336340A - Sewing-machine attachment - Google Patents

Description

C. BERGERON. SEWING MACHINE ATTACHMENT.

APPLICATION FILED APR.24, I9I9.

Patented Apr. 6, 1920.

M InvenZ'or llllior 'S,

UNITED STATES PATENT OFFICE.

CLOVIS BERGERON,

OF MORGANZA, LOUISIANA, ASSIGNOR OF ONE-HALF TO EMERSON W. SINGLETARY, 0F MQBG'ANZA; LOUISIANA.

SEWING-MACHINE ATTACHMENT.

Application filed April 241-, 1918.

Z '0 all whom it may concern.

Be it known that I, Cnovrs BERcEnoN, a citizen of the United States, residing at Morganza, in the parish of Pointe Coupee and State of Louisiana, have invented cer tain new and useful Improvements in Sewing-Machine Attachments; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improvements in sewing machine attachments, and has for an object to provide an improvement accessory to the presser foot and needle bar of a sewing machine which will automatically shift the cloth back and forth in a lateral direction to the direction of passage of the cloth for the purpose of overseaming, buttonhole stitching, darning, and the like.

It is a further object of the present invention to provide an attachment of the above character which will be constructed of few and simple parts adapted to operate effectively and capable of economical manufacture.

With these and other objects in View the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

In the accompanying drawings forming a part of this application, and in which. similar reference symbols indicate corresponding parts in the several views:

Figure 1 is a side elevational view of an improved attachment constructed in accordance with the present invention, and shown in one position.

Fig. 2 is a similar view with parts broken away showing the device at the other end of its movement.

Fig. 3 is a top plan view of the attachment.

Fig. 4 is a sectional view taken on the line 44 in Fig. 3; and

Fig. 5 is a transverse sectional view taken on the line 55 in Fig. 2.

Referring more particularly to the drawings, 1 indicates the usual barthat carries I the customary presser foot 2, and 3 indicates the needle bar that reciprocates vertically to and from the presser foot 2.

Specification of Letters Patent.

Patented Apr. 6, 1920.

Serial No. 292,844.

reciprocating movement of the needle bar.

At its opposite end the lever 4 is connected to a head 6 fulcrumed to oscillate on a pivot 7 carried by the free end of an arm 8 carried by the presser foot bar 1. The head 6 is formed by the two divergent arms extending to opposite sides of the fulcrum 7, and such arms are pivotally connected at their free ends as indicated at 9 and 10, respectively, to the rear curved ends 11 and 12 of a pair of bars13 and 14 fitted loosely through a guide 15. This guide 15 is formed with a bracket 16 which passes above and down on the opposite side of the arm 8, where it is held in place by a clamp nut 17. The arrangement is such that the guide 15 will be held spaced from the front face of the arm 8, as shown in Fig. 5, to allow a space between the guide andarm. wherein a slotted bar 18 may reciprocate in a horizontal direction.

A pair of bolts 19 and 20 are employed to pass through the slot 21 in the plate 18 for supporting such plate, while at the same time allowing it to reciprocate horizontally; and such bolts 19 and 20 are supported by the arm 8, one of the bolts, as 19, forming a means for receiving the clamp nut 17 by which the bracket 16 is held in place against the rear face of said arm 8.

The spring 22 is coiled about the pivot bolt 7 as shown in Fig.- 3, and has arms 23 and 24 extending from opposite ends of the coil 22 provided with claws 25 and 26 engaging above and beneath, respectively, the bars 13 and 14 for yieldingly holding such bars together, but allowing same to be moved apart, as hereinafter more fully explained.

- 27 in its lower edge and near its free end,

which slot is provided at one end with a claw 28 projecting into the slot 27 at the right hand end of such slot. The opposite end of the slot 27 is formed into a curved or cam-like wall 29.

The other bar 14 is also provided with a slot 30 having at its left hand end a claw- 31 and at the right hand end thereof a curved or cam-like wall 32. These two slots 7 than the edge 34, is designed to be caught in the oppositely disposed claw 31 in the lower bar 14, and between these two claws the projection will be shifted back and forth in a horizontal direction, carrying therewith the slotted bar 18.

The bevel faces 36 and 37 of the diamondshaped projection 33 are adapted to cooperate with the cam-like walls 29 and 32 of the bars 13 and 14, in order that the bars may be properly shifted to bring the two claws into successive engagement with the respective edges 34 and 35 of said projection 33. In the position shown in Fig. 1, the projection 33 has just been shifted to the position it occupies by the raising of the needle bar 3, which also raises the lever 4, and through the head 6 pushes the lower bar 14in a right hand horizontal direction. The claw 31 in engagement with the edge 35 of the projection has just delivered such projection to the position shown in this figure, and the parts appear as having moved through a small degree in opposite directions.

On the descent of the needle bar 3, through the lever 4 and head '6, the lower bar 14 will be shifted in a left hand direction while the upper companion bar 13 will be shifted in the opposite or a right hand direction. With the projection 33 in the right hand position and the needle bar descending, the cam-like wall 32 will engage the bevel. face 36 and cause the lower bar 14 to be deflected downwardly, which is allowed by the yieldable spring arm 24; while the cam-like face 29 on the upper bar 13will, in like manner, he forced to ride against the other beveled face 37 of the projection 33, and in like manner this upper bar 13 will be lifted from the projection 33 and this will be allowed by the expansion of the other spring arm 23. On the descending of the needle bar 3 therefore, the projection 33 will be unaffected, and will remain in the right hand position.

The lower position of the needle bar 3 is shown in Fig. 2, and the two bars 13 and 14 are shown as having been pried apart by the projection 33 without having had any effect to move the same. However, on the next followmg upward movement of the needle bar 3, the upper bar 13 will be moved in a left "hand direction, and as soonas the slot 27 is brought above the projection 33 the spring arm 23 will cause the arm to descend The fact that the claw 28 extends beneath.

the right hand portion of the slot 27 will serve to give the upper bar 13 a good grip on the projection 33 and prevent such upper bar being accidentally forced out of engagement with the projection by any action of the lower arm 14.

Moreover, by reason of the diamond shape imparted to the projection 33 the under face 38 thereof adjoining the edge 35, will cause the claw 31 on the lower bar 14 to slide freely over the lower portion of the pro ection and prevent the lockingof the two arms against movement, which would result if the two claws simultaneously engaged the pro jection.

The slotted bar 18 has an extension 39 pivoted, as indicated at 40, to one arm 41 of the bell crank leverwhich is 'fu'lcrumed, as at 42, at one corner of a plate 43 carried on the lower end of the presser foot supporting bar 1. The plate 43 is formed with an opening 44 which admits the presser foot 2, which is depressed therebeneath, and also with elongated slots 45 through which slidably pass the screws or other fastening elements 46 employed to support the laterally slidable cloth bar 47. At one edge the plate 43 is recessed, as indicatedv at 48, to expose the cloth bar 47 which carries at this point a projection 49extending up through a slot 50 in the other arm 51 of said bell crank lever. The cloth bar 47 is provided with a number of threaded perforations 60 to receive the projection 49 to vary the throw of the cloth bar, thereby making the attachment adjustable for stitches .of different widths. The lower face of the cloth bar is roughened, as indicated at 52, to better engage the cloth and cause a more positive movement thereof.

In operation, the needle bar 3 reciprocates back and forth between the .two positions shown in Fig. 1 and Fig. 2, and simultaneously swings the lever 4 and the pivoted head 6 therewith,causing.the bars 13 and 14 to shift horizontally and alternately in opposite directions, with the. results on the projection 33 as above explained. The movement of the projection 33 causes a similar movement in the slotted bar 18 and the movement of the bar 18 is communicated through the extension 39 .to the bell crank lever 41, which is correspondingly swung about its fulcru1n42.v The swinging of the bell crank lever causes the cloth plate 47 to be shifted back and forth laterally, and this laterally shifting movement is communicated to the cloth so that a zigzag or stag ered stitch is made by the needle, such as is necessary for buttonhole stitching, darning, and what is known as overseaming. Of course the device may be useful in any other work.

The lever 4 and the head 6 may be made in one rigid piece, if desired, and in such case the lever will project at the same working angle which will have to be previously ascertained. The upper end of the lever at above the slot 5 is beveled as indicated in Figs. 1 and 2, and this bevel is determined after the proper Working angle has been found.

It is obvious that those skilled in the art may vary the details of construction and arrangements of parts Without departing from the spirit of my invention, and therefore I do not wish tobe limited to such features except as may be required by the claims.

I claim:

1. A sewing machine attachment of the character described including reciprocating bars, means whereby said bars may be actu ated from the movable parts of the sewing machine, oppositely acting claws carried by said bars, a projection entering between said bars and having edges arranged to be engaged by said oppositely acting claws, a reciprocating bar car 'ying and movable with said projection, a bell crank lever, a connection between the last named bar and one arm of said bell crank lever, a laterally shifting cloth plate, and a loose connection between said cloth plate and the other arm of said bell crank lever, substantially as described.

2. A sewing machine attachment of the character described including reciprocating bars, a means whereby said bars may be actuated from the movable parts of the sewing machine, oppositely acting claws carried by said bars, a projection adapted to be alternately caught by said claws and reciprocated, a reciprocating bar carrying and movable with said projection, a bell crank lever having connection to said reciprocating bar, and a laterally shifting cloth plate having a loose connection to said bell crank lever, substantially as described.

CLOVIS BERGERON.

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