US2935959A

US2935959A - Overcasting attachment

Info

Publication number: US2935959A
Application number: US796895A
Authority: US
Inventors: Carl G Baehr
Original assignee: Greist Manufacturing Co
Current assignee: Greist Manufacturing Co
Priority date: 1959-03-03
Filing date: 1959-03-03
Publication date: 1960-05-10
Anticipated expiration: 1977-05-10

Description

y 10, 1950 c. G. BAEHR 2,935,959

OVERCASTING ATTACHMENT Filed March 5, 1959 'IHI Z1 3% INVENTOR C ff/ 2,935,959 OVERCASTING ATTACHMENT Application March 3, 1959, Serial No. 796,895 3. Claims. 01. 112-160) This invention relates to sewing machine attachments and more particularly to an attachment to produce overcasting work or stitches over the edge of a piece of material. As illustrated, the attachment is particularly adapted to be employed withthe usual household sewing machine and is. an improvement over, the attachment shown in my United States Patent No. 2,779,300, January 29', 1957.

In overcasting attachments of the type of he present application means is provided to turn an edge of the material upon which overcasting stitches are to be made upwardly in a substantially vertical plane and move the material laterally of the line of stitching from one side of the path of the. needle to the other so that stitches are effected over the upstanding edge of the material. This lateral movement of the material is effected by a presser 7 foot carried by a lever pivotally mounted Qntheattachment frame which is adapted to be secured to the presser bar of a sewing machine. This lever is oscillated by movement of the needle bar in a well-known manner so as to oscillate thelever and presser foot to effect the lateral movements thereof.

w I 1C6 Pat nt d y 10, 9

. To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed. 1 In the accompanying drawings: I

Fig. 1 is a side elevational view of an overcasting attachment embodying my invention;

Fig. 2 is a top plan view of the presser foot and scroll mechanism; 3

Fig. 3 is a bottom plan view of the parts shown in Fig. 2;

Fig. 4 is a sectional view on line 4-4 of Fig. 2;

Fig. 5 is a sectional view on line 55 of Fig. 2; and

Fig. 6 is a side elevational view of the scroll mechanism looking from the side opposite that shown in Fig. 1..

To illustrate one embodiment of my invention there is shown in the drawings a frame member 10 having a base 11 to which is pivotally secured at 12 a forwardly extending lever 13. This lever is oscillated about its pivot 12 by a cam 14 rotatably mounted in the frame 10 and actuated in a step-by-step -manner by a fork arm 15 loosely mounted on thelshaft 16 of the cam; Secured to the shaft 16 is the usual ratchet wheel 17 which is en The means to turn an edge of the cloth or material into a vertical plane consists of a scroll member adapted to receive the cloth and provided with spaced plate-like elements between which the upturned edge of the cloth moves. The passageway between these plate-like elements is flared in a forward direction so asto permit easy entry of the cloth and this passage leads into a scroll finger of channel-shaped formation, the open side of the channel facing downwardlyso that the upturned edge of the cloth passes through this channel. This channelshaped member serves as a 'gmide for the upturned edge of the cloth and the thread as the needle moves from one side of the member to the other will pass over the top closed edge of this channel-shaped member and be restrained from binding againstthe upturned edge of the cloth. I I

The] scroll mechanism may be made of very light material and is removably secured to the oscillating lever which carries the presser foot so that it may be readily removed and replaced by another of different form or size.

One object of the invention is to provide a new and improved overcasting attachment for sewing machines.

A further object of the invention is to provide an overcasting attachment for sewing machines which may be of relatively light weight and which will effect the turning of the edge of a piece of material into a vertical plane and guard this edge against being distorted by the thread when the latter passes over the edge in the operation of the machine.

Still another object of the invention is to provide an overcasting attachment of the character described in which a covered channel or guide-way is provided through which gaged'by a pawl 18 pivoted on the fork arm.

It will be understood that the parts thus far described are of the usual form so that detailed description thereof is unnecessary, and according to the usual practice the fork arm'15 is designed to be engaged with the needle bar for oscillation thereby. Likewise the frame 10 is provided ,with an adapter 19 by means of which the attachment may be secured to the presser bar of the machine with which the attachment is used. v a

The forward end of the lever 13 lSlOfiSEi'dOWHWHIdlY, as shown at 20, to provide a presser foot 21 having a needle recess 22 therein and an upstanding flange 23 at one side to which flange the scroll of. the attachment is to be removably securedas will be hereinafter explained. The scrollis preferably formed of thin sheet metal and consists of a substantially horizontally disposed plate or wing portion 24, the metal of which is turned upwardly and extended rearwardly, as shown at 2.5. Adjacent its rear end the portion 25 is turned downwardly upon itself to provide a portion 26 substantially parallel to the part 25 and spaced therefrom so as to provide a channel or guideway between these two members which are substantially parallel.' At its forward end, however, the member 26 may be flared outwardly, as shown at 27, so as to'provide a flaring mouth or opening leading into the space between

themembers

25 and 26. As the latter two members are integrally formed, the space between them is, at its rear end, covered by the turned or bight portion 28, thus providing at the rear end of the scroll member a covered channel betweenthe

members

25 and 26.

Secured to the scroll just described iis arrearwardly extending finger consisting of a channel member 29 formed by folding a relatively thin sheet member upon itself to provide a relatively narrow downwardly facing channel 30 (Fig. 3) between the wall or side portionsfil and 32 which are substantially parallel. This channel is closed at the top by the web or bight portion of the member 29.

At its forward end the walls of this finger are extended forwardly to provide

spaced wings

33 and 34 embracing the rear ends of the

members

25 and 26. These wing members may be secured to the

members

25 and 26 by soldering or other convenient method so that the member 29, as shown in Fig. 3, presents a downwardly facing channel communicaitng with and forming a continuation of that between the

members

25 and 26.

The upturned edge of the material passes through this channel in its movement rearwardly through the attachment, and it will be noted that the member 29 is of very narrow width so that the needle may pass first on one side and then on the other thereof as the presser foot and scroll member carried thereby are oscillated in a lateraldirection with respect to the path of the stitches.

The scroll is secured to the presser foot by means of a Z-shaped bracket 35 secured at its end 36 to theportion 27 of the scroll and which is provided with a plate-like portion 37 (Fig. 6,) having an open-ended slot 38. The member 37 is applied fiatwise to the upstanding flange 23 of the presser .foot with the slot 38 embracing a pin or rivet 39 securedto this fiange. A bowed spring 40 between the head of the rivet and the plate portion 37 holds the latter removably in place. The slot-38 may also embrace a lug 41 on the member 23 to prevent rotation of the member 37 about the rivet 39. Thus the scroll is conveniently and removably held in place so that it may be readily'd'etached by a forward pull and replaced by another if desired.

In the use of the device the material is fed over the horizontal wing portion 24 of the plate member with its edge toward the member 25. As the cloth is moved rearwardly, its edge will be folded upwardly into a vertical plane by the rearwardly extending member 25, and this edge will pass between the members 25'and 26 below the bight portion 28. It will, therefore, be guided into the narrow channel presented by the finger 29. As the lever 13 is oscillated about its pivot 12, the presser foot and scroll member will'be moved laterally, thus causing the member 29 with the upturned edge of the material enclosed therein to pass below the needle from one side thereof to the other. this member and over the edge of the material therein. As the rearward movement of the material is continued, this edge will pass out from the rear end of the finger 29 with the thread cast over the upturned edge. The channel-shaped member 29 encloses the upturned edge of the material upon both sides and the upper edge thereof and serves as a support for the overcast thread during thesewing operation.

I While I have shown and described one embodiment of my invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the claims.

What I claim is:

1. An overcasting attachment for a sewing machine comprising a frame, a lever pivotally secured thereto for oscillating movement in a horizontal plane, a presser foot carried by said lever and provided with a needle opening,

a scroll member secured to the presser foot having a flat.

wing portion at its forward end and a rearwardly extending substantially vertically disposed wall portion at one edge thereof to turn the edge of material passing therethrough into a substantially vertical plane, said wall portion being folded downwardly at its rear end to pro- Thus stitches will be made over vide an inverted downwardly facing channel having spaced substantially parallel sides between which the material passes and a thread-supporting finger of inverted channel shape in cross section secured'to said wall portion and extending rearwardly therefrom past said needle opening to receive the upturned edge of the material from said first channel, and the upper edge of said channel supporting the thread when the latter is carried over said finger.

2. An overcasting attachment for a sewing machine comprising a frame, a lever pivotally secured thereto for oscillating movement in a horizontal plane, a presser foot carried by said lever and provided with a needle opening, ascroll member secured to the presser foot having a fiat wing portion at its forward end and a rearwardly extending substantially vertically disposed wall portion at one edge thereof to turn the edge of material passing therethrough into a substantially vertical plane, said wall portion being folded downwardly at its rear end to provide an inverted downwardly facing channel having spaced substantially parallel sides between which the material passes and a thread-supporting finger of inverted channel shape in cross section secured to said wall portion and extending rearwardly therefrom past said needle opening to receive the upturned edge of the material from said first channel, the upper edge of said channel supporting the thread when the latter is carried over said finger, and the side walls of said finger member being extended forwardly to embrace the sides of said first channel and be secured thereto.

3. An overcasting attachment for a sewing machine comprising a frame, alever pivotally secured thereto for oscillating movement in a horizontal plane, a presser foot carried by said lever, a scroll member secured to the presser foot having a flat wing portion at its forward end and a rearwardly extending substantially vertically disposed wall portion at one edge thereof to turn the edge of material passing therethrough into a substantially vertical plane, said wall portion being folded downwardly at its rear end to provide a downwardly facing covered channel member through which the upturned edge of the material passes, a second downwardly facing covered channel member secured to the scroll member with its channel in alignment with said first channel to receive the material therefrom, said second channel member extending rearwardly along an edge of the presser foot and the latter having a recess opening through said edge opposite said second channel member for the reception of the needle of the sewing machine, and the side walls of said second-named channel being continued forwardly, past said recess, to be telescoped over the walls of the first channel and be secured thereto.

References Cited in the file of this patent UNITED STATES PATENTS 1,067,419 Fefel July 15, 1913 2,281,275 Enos Apr. 28, 1942 2,321,747 Hickey June 15, 1943 2,779,300 Baehr Jan. 29, 1957