US2160120A

US2160120A - Feed dog for sewing machines

Info

Publication number: US2160120A
Application number: US229055A
Authority: US
Inventors: Brussell Jacob
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-07-07
Filing date: 1938-09-09
Publication date: 1939-05-30
Anticipated expiration: 1956-05-30

Description

May 30, 1939. J. BRUSSELL.

FEED DOG FOR SEWING MACHINES Original Filed July '7, 1957 INVENTOR. J/] (023 BR UJSEZL ATTORNEY.

Patented May 30, 1939 oNiTEo STATES PATENT OFFICE I FEED DOG FOR SEWING MACHINES Jacob Brussell, New York, N. Y., assignor to Isadore Friedman, Roselle, N. J.

Original application July 7, 1937, Serial No.

152,401. Divided and this application September 9, 1938, Serial No. 229,055

6 Claims. (Cl. 112-216) The present invention is directed to sewing feed dog illustrating the unitary character theremachines, more particularly to multiple needle of. sewing machines, and the present invention is The bed I of the sewing machine is provided directed to a new feed dog structure adapted for with throat plate 2, of usual construction. Said use in such machines. The present application throat plate in the case of a multiple needle 5 is a division of my co-pending application Serial sewing machine, is provided with a series of No. 152,401, filed July '7, 1937, and entitled Mulparallel slots and also with openings for the pastiple needle sewing machines. sage of the needles. The feed dog structure is Although it is highly desirable to have the introduced into said slots for operation.

lines of stitching in shirring as close together as There is provided a support 3 for the feed dog, 10 possible, the minimum space between the same said support being U-shaped and having an exhas been approximately of an inch due to the tension 4 on one side thereof connected to a stud limitations of the mechanism which advances 5 on arm 6, said arm bein cu o S aft the cloth. The feed dog was constructed in the On the opposite side of said support 3 is a forked form of a fork with prongs extending in the slots end 8 embracing a roller 9, mounted on arm I0, 15

of the throat plate. These prongs were cantiwhich in turn is secured to shaft ll. Shafts 1 levered, and so had to be of considerable thickand II are given motions such as are well known ness to provide necessary strength. As there in the art in order to move the sup for the must be one such prong as wellas a part of the actuation of the feed dog in the usual manner.

throat between adjacent needles, the needles were The feed dog i e omprises a frame having 20 spaced a considerable distance apart. side members l2 and I3, substantially parallel,

It is among the objects of my invention to and end members I4 also parallel to each other, overcome the disadvantages of prior machines the four members of the frame constituting a and to construct the feed dog without prongs by rectangle and usually all the parts thereof are 95 providing a box-like structure, so that the strain integral. Integ a With the frame is provided a on the parts is small and so that the parts exseries of parallel feed bars l5, having the usual tending in the slots in the throat plate may be serrated upper surfaces. Said bars project above narrow and the needles may be placed closer tothe frame so that when the feed dog is in position gether, thus providing for more needles and a below the throat plate 2, the tops of the extending "0 finer gauge machine producing a product with bars are above the surface of the throat plate and lines of shirring closer together than heretofore. pass through the slots thereof. As bars 15 are Among the difficulties encountered in increasrigidly Supported at bo end on frame members ing the width of the machine and the number of i2 d y are of extraordinary Strength needles has been in keeping the feed dog level. a d. therefore, y y b made narrower than This difiiculty arose from the fast that the feed was p ssibl n f d dogs re of re, ey may 35 dog rested on and was supported by a small plate be placed closer together so that more needles which could not be adjusted and which was 10- y be used in a Confined p thus giving cated midway between the ends of the feed dog. fi r gauge u t t an was p ssible in the It is among the objects of my invention to con prior art.

struct a feed dog with supports at the ends The under part Of the feed dog is in the form 40 thereof and to provide adjustable leveling means. of an arch It, so that the feed bars are fixed I accomplish this by providing at each end of at the two sides l2 and I3, and gradually taper the feed dog an operating part which is attached to about the central portion above the hook H, to the rock shafts of the machine and supplies which is mounted upon shaft [8 for actuation as the motion to the feed dog to advance the cloth usual. The arch l6 has an additional effect in 45 and I extend through these parts four screws that it allows the placing of the feed dog in which abut the under part of the feed dog near close proximity to the hook without interference its four corners and so providing a leveling means. with the functions thereof.

In the accompanying drawing, constituting a In the case of a multiple needle machine, and part hereof, and in which like reference charparticularly one which has a relatively large 50 acters indicate like parts, number of needles, the feed dog is of relatively Fig. 1 is a vertical cross-sectional view taken great width. Therefore, a problem arises as to transversely of the swing machine, showing the the exact alignment and leveling of the feed dog, feed dog in position for operation; and and the present invention contemplates a device Fig. 2 is a fragmentary perspective view of the for this purpose. To accomplish this, screws I9 55 are provided in the support 3, at each of the corners of the frame I2-I3-|4, said screws extending as shown in Fig. 1, so as to contact with the under side of the feed dog frame, which bridges the gap between the upper ends of the legs of the U. The hook shaft lies within the U. There are also provided a series of screws 20 passing through openings 2| at each of the corners of the feed dog frame and being threaded into the support 3.

In order to adjust the level of the feed dog, the screws 20 are loosened and screws I9 are adjusted either upwardly or downwardly, as the case may be, until the frame l2l3-|4 is properly leveled. Then the screws 20 are tightened, thereby locking the feed dog in its proper position.

In the prior art, a feed dog was supported from its central point so that it was impossible to properly support a feed dog of any great width. In the present invention, the feed dog frame is supported at a number of points instead of in the center as formerly, and therefore it may be made of any length, still maintaining proper strength for all types of service.

Although I have'described my invention, setting forth a single embodiment thereof, it is apparent that various modifications and changes in the details of construction are possible within the scope of the invention. For instance, instead of four screws for holding the feed dog in proper position, a lesser or greater number may be, of course, provided. While the feed bars l5 are shown as a single piece with the frame of the feed dog, and I usually prefer to cut the entire feed dog from a single piece of metal, it is, of course, possible to fabricate the same in part and then join the parts to form an integral, rigid structure. In some cases, the adjustability of the feed dog may be omitted. These and other changes in the details may be made without departing from the spirit of the invention, the scope of which is not to be limited except by the character of the claims appended hereto.

What I claim is:

1. In a sewing machine, a feed dog comprising a substantially rigid open frame, a plurality of substantially parallel feed bars within said frame, said feed bars bridging the space between opposite sides of said frame, means for adjusting the level of said frame at a plurality of corners thereof, and means for supporting said frame, said adjusting means including screws threaded into said support and contacting with the corners of said frame.

2. In a sewing machine, a feed dog comprising a substantially rigid open rectangular frame having a pair of substantially parallel sides and a pair of substantially parallel ends, a plurality of substantially parallel feed bars within said frame, said feed bars bridging the space between the opposite sides of said, frame and means for supporting said frame.

3. In a sewing machine, a feed dog comprising a substantially rigid open rectangular frame having a pair of substantially parallel sides and a pair of substantially parallel ends, a plurality of substantially parallel feed bars within said frame, said feed bars bridging the space between the opposite sides of said frame, a plurality of independent adjusting members adjacent a plurality of corners of said frame for adjusting the level thereof, and means for supporting said frame.

4. In a sewing machine, a feed dog comprising a substantially rigid open rectangular frame having a pair of substantially parallel sides and a pair of substantially parallel ends, a plurality of substantially parallel feed bars within said frame, said feed bars being integrally formed with said frame, said feed bars bridging the space between the opposite sides of said frame, and means for supporting said frame.

5. In a sewing machine, a feed dog comprising a substantially rigid open rectangular frame having a pair of substantially parallel sides and a pair of substantially parallel ends, the length of the sides being greater than the ends, a hook shaft, the sides being substantially parallel with said hook shaft, a plurality of substantially parallel feed bars within said frame, said feed bars bridging the space between the opposite sides of said frame, and means for supporting said frame.

6. In a sewing machine, a feed dog comprising a substantially rigid open rectangular frame hav-- ing a pair of substantially parallel sides and a pair of substantially parallel ends, a plurality of substantially parallel feed bars within said frame, said feed bars bridging the space between the opposite sides of said frame, and means for supporting said frame including a U-shaped member with means for actuating the same, a hook shaft within said U, said frame bridging the gap between the upper ends of the legs of said U.

J. BRUSSELL.