US2007539A - Adjustable felling device for sewing machines - Google Patents

Description

July 9, 1935.

B. M. KRELL v ADJUSTABLE FELLING DEVICE FOR SEWING MACHINES Filed April 26, 1934 INVENTOR BERNARD M. KREZZ Patented July 9, 1935 PATENT. OFF! on t Y ADJUSTABLE FELLING DEVICE FOR SEWING; MACHINES Y Bernard M. Krell, lt ooklyn, Y. Application April 26, 1934, Serial No.'722;416 i '4 Claims. (01. 112-142) I T The present invention relates to a feller for sewing machines for the making of curved or straight lap seams, of the type described in United States Patent No. 1,241,739, issued to me, as joint inventor on the 2nd day of October, 1917, and it is the object of the present invention toprovide a feller of the character described possessing improved means for adjusting the width of the seams produced by it, which means-may beadjusted at any time during the operation of the machine, Without disturbing the set-up of the feller and without removing the work therefrom, by simple, easily operable and effective adjustingmeans.

In the accompanying drawing illustrating a preferred embodiment of the feller of the present invention with its improved adjusting'means,

Fig. 1 is a top plan view of the assembledfeller of the present invention;

Fig. 2 is a front end view of the same; Fig. 3 is a rear end view of the same; Fig. 4 is a view, in perspective, of the base plate of the feller of the present invention, as observedhereafter be described, with respect to the sewing machine needles which operates to the rear thereof. Formed on the rear central portion of the base plate I0 is a raised, substantially rectangular platform, l2, its surface inclining slightly rearwardly, and its rear leftcornerforming a tongue, l3, overhanging its rear wall. To the leftv of the platform, l2, the base plate, I0, is provided with a work sliding portion, l4.

The platform, I2, is provided with a pair of seats or sockets, l 5, in the center of each of which is a threaded screw opening, 16, for the purpose of mounting and securing thereon a scroll plate,

l1, having depressions, l8, somewhat smaller than and adapted to fit movably within the sockets I5.

Each of the said depressions, I8, is slotted, asat, l9, through which slots pass screws 20, into the threaded openings, 16, to secure and adjust the scrollplate, IT, to the base plate, 10, the heads of the screws, 20, fitting within the depressions, I8, substantially flush with the surface of the scroll plate, I 1, to present a smooth and even surface, unobstructed for the passing of the work thereon. I

The main portion ofthe scroll plate, l1, may

be shaped to conform to the surface of the platformflZ, with its tongue, l3, and extend slightly beyond its left wall, overhanging it, where it may be cut off partially from the rear toqform a narrower portion, 2| which is curved downwardly, as at 22, and then to the right, as at 23, and then 10 curved downwardly again, as at 24, at which point it may be widened again and is then curved to the left, as at 25, and then upwardly again, as at 26, and then to the right again, as at 21, to completely surround the curve at 22, thus forming, when the scroll plate I7, is mounted on the platform, l2, a pair of oppositely facing, interlocking. C shaped channels, 28 and 29,

' The method of operation of the feller, as heretofore described, which'is morefully set out in my US. Patent No. 1,241,739, which also explains its adaptability for the making of curved lap seams, is substantially as follows; One of the workpieces which it may be desired to attach by means of a lap seam to another, is slid over the portion l4, into the, channel 28, until its seam'edge is brought up against the downwardly curved portionZZ, of the scroll plate ll.. Theother work piece is then slid over the top of the scroll plate ll, into the channel 29,. untilits seam edge is 30 brought up against the downwardly turned portion 24, ofthe scroll plate, thus having the seam edges of the'two work pieces insuperimposed and overlapping positionwith respect to one another. ward the sewing machine needle, not thought necessary to. be here shown, which sews the seam as desired; It may here be stated that the chan-' nels 28 and ,29 may be constructed'to be contracted and. narrowed to therear and to slant found necessary, though, during operation, to

make furtherand additional adjustment of the seamwidth, at which time, the displacement of the work, particularly in a position in advance of,

the channels, is highly inconvenient, and the ad- In this position the work is advanced to- 5 consuming. Furthermore, it has been found that continued use of the feller rapidly wears out the left wall of the platform, I2, due to the friction of the work fabric against it, thus throwing the seam forming portion of the feller out of gear and requiring the replacement thereof entirely or of its base plate, In. To eliminate these disadvantages I have devised the auxiliary seam adjusting unit, 30, which I will now describe.

Such seam adjusting unit, 30, comprises an arcuate channelled central portion, 31, adapted to rest against the left wall of the platform, II, which may also be channelled to receive it, the channel facing the scroll portion of the scroll plate, I1, and forming the back of the 0 channel 28. Extending from the front end of the arcuate channel portion 30 is a resilient spring tongue, 32, which may be turned to the right and provided with an opening, 33, through which it may be secured to the front wall of the platform [2, by means of a screw, 34 engaged in the threaded opening provided for the purpose in the front wall of the platform l2. Any means for securing the front end of the adjusting unit 30 to the base plate may be employed, however, without detracting from its operability. Extending from the rear end of. the arcuate channel portion, 3 I, and preferably integral with it, is an arm, 35, which may be turned downwardly and then to the right to contact with the rear wall of the platform, l2. The arm, 35, is provided, adjacent its free end, with a slot, 36, through which may pass a screw, 31, into the threaded opening, 38, provided for it in the base plate l2. The free end of the arm 35 maybe turned up to form a lug, 39, to facilitate the handling thereof, as will hereinafter be explained. The head of the screw, 31, may be of the usual type, requiring a screw driver to turn it, but may be, preferably,-elongated and knurled, to enable manual operation thereof. n

It is apparent from the foregoing description that the width of the seam may be adjusted by loosening the screw, 31, and moving the rear end of the arcuate channel portion by means of the lug, 39, to either narrow or widen the rear opening of the channel 28, and then tightening the said screw to maintain the adjusting unit 30 in its new position. This may be readily done because of the flexibility of the tongue 32, by which it is secured at it front end.

It is readily apparent to those skilled in the art that the device of the present invention is highly effective for its purpose and that it lends itself readily to compensate, by adjustment, for any wearing out of the back portion of the channel 28, and that it may be economically replaced at small cost.

This completes the description of the felling device of the present invention with its auxiliary seam adjusting means, and of its mode of operation. It is to be clearly understood, however,

that I do not wish to be limited to the embodiment thereof herein described, as, obviously, others may be made, without the exercise of the inventive faculties and within the meaning and scope of the claims hereto appended.

What I claim as my invention is:

1. A device of the character described, comprising a base plate having an elevated, substantially rectangular platform at its rear central portion, an arcuate guiding member positioned alongside the left wall of the said platform, a flexible tongue extending from the front end of the said guiding member and secured to the said platform, an arm extending from the rear end of the said guiding member adjustably secured to the rear wall of the said platform, a plate mounted on the said platform having a scroll portion overhanging the left wall of the said platform and the guiding member positioned alongside thereof, the said scroll portion forming an upper C shaped channel facing the said platform and forming with the said guiding member and the left portion of the base plate a lower 0 shaped channel facing in the opposite direction, the upper curved portion of the lower channel overhanging the lower curved portion of the said upper channel.

7 2. A device of the character described, comprising a base plate having an elevated, substantially rectangular platform adjacent its rear edge, an arcuate guiding member positioned alongside the left wall of the said platform, a fiexibletongue extending from the front end of the said guiding member and secured to the said platform, an armextending from the rear end of the said guiding member along the rear wall of the said platformand adjustably secured thereto, a plate mounted. on the'said platform having a scroll portion over-. hanging the left edge of the said platform and the guiding member positioned alongside thereof, the.

said scroll portion'forming an upper C shaped channel facing the said platform and forming with the said guidingmember a lower 0 shaped channel facing in the opposite direction, the upper curved portion of the said lower channel-overhanging the lower curved portion of the said upper channel, the said rear arm being adapted to move the said guiding member to regulate the width of the rear opening of the said'lower chan,

nel. 1

3. A device of the character described, comprising a base plate having an elevated, substantially rectangular platform at its rear central portion, said platform sloping downwardly to the rear, an arcuate guiding member positioned along the left wall of the said platform, a flexible tongue extending from the front end of the said guiding member and secured to the said platform, an arm extending fromv the rear end of the said guiding member along the rear wall of the said platform and adjustably secured thereto, said arm being adapted to move the. rear end of the said guiding member, a plate mounted on the said platform, said plate, having a scroll portion overhanging the left wall of the said platform.

and the guiding member positioned alongside thereof, said scroll portion forming an upper C- shaped channel facing the platform, and forming,

with thesaid guiding member, a lower C shaped channel facing in-the opposite direction, the upper curved portion of the said lower channel overhanging the lower curved portion of the said upper narrowed towards the rear.- I

4. In a feller for sewing machines for-making lap seams having a pair of oppositely facing, overlapping c shaped channels, seam adjusting meanscomprising an arcuate member positioned within -BERNARD M. KRELL.

to be channel, both said channels beingcontracted and

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