US2069006A

US2069006A - Presser foot for sewing machines

Info

Publication number: US2069006A
Application number: US3169A
Authority: US
Inventors: Ebert Fritz
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-02-01
Filing date: 1935-01-23
Publication date: 1937-01-26
Anticipated expiration: 1954-01-26

Description

Jim. 26; 11937. F. EBERT 2,@69,006

P-RES SER FOOT FOR SEWING MACHINES Filed Jan. 215, 1935 3 Sheets-Sheet l A f/army,

Jan. 26, 1937.

F. EBERT PRESSER FOOT FOR SEWING MACHINES Filed Jan.

25, 1955 3 Sheets-Sheet 3 .1 new for: fiifz lfzeri,

Patented Jan. 26, 1937 UNITED STATES PATENT OFFICE:

2,069,006 PRES SER FOOT FOR SEWING MACHINES Fritz Ebert, Oberndorf-on-the-Neckar, Germany Application January 23, 1935, Serial No. 3,169 In Germany February 1, 1934 Claims. (01. 112235) The present invention relates to sewing maof the presser foot, be lifted independently or chines adapted to simultaneously produce two shifted against the action of its spring. I different sewing operations, i. e. to make a join- With presser feet for sewing machines having ing seam and a cover seam at the same time in a a guide edge, it has already been known to move 5 single operation. If the joining seam is finished, the guide edge by means of a handle beyond the 6 simultaneously the cover seam also is produced. under surface of the presser foot as soon as it is A presser foot suitable for such machines must, not required for use, thus simultaneously obtaintherefore, be capable of working for each of ing the advantage that, with the presser foot these operations. Thus, in order to obtain a perlifted, the guide edge does not form an obstacle fect suture, the presser foot must be able to adapt on withdrawing the fabric. 10

-itself as far as possible to double cross seams. With regard to this known cutting out of the This adaptability requires an extensive subdiviedge guide, the subject matter of the invention sion and ability of movement respectively of the has the advantage that the edge guide, during presser foot. lifting of the presser foot, is automatically swung The main object of the invention is to provide upwardly, thereby saving one operation. 5 a presser foot which is subdivided several times In the accompanying drawings, forming part of in its longitudinal direction as well as in its latthe specification, two embodiments of a presser eral direction and in which each of these movfoot according to the invention are shown by way able parts is adjustably arranged and individualof example.

ly limited in its downward movement, the pres- In these drawings: 20

sure of each of these parts being resiliently ad- Fig. 1 is a plan view of a presser foot accordjustable. ing to the invention,

The presser foot part adapted to cooperate with Fig. 2 shows a side elevation, partly in section the joining seam consists of four portions which on the line 2-2 of Fig. 1,

may be moved independently of each other. Fig. 3 is a rear elevation, 25

With regard to cross seams, occurring some- Fig.4 is a front elevation, times at the left and sometimes at the right hand Fig. 5 shows a section on the line 5-5 of Fig. 1, side, the front portion is subdivided in its lon- Fig. 6 is a side elevation, partly in section on gitudinal direction. The second portion of the the line 6-6 of Fig. 1, illustrating the fabric presser foot, provided in case of a sewing machine with a cross seam passing from one side to the 30 having staggered needles with the stitch hole for other, the needle producing the joining seams, is also Fig. 7 shows a side elevation corresponding to subdivided in its longitudinal direction for rea- Fig. 2 with the parts in another operative posisons mentioned already above. Besides the four tion,

pivotally arranged parts, resilient side portions Fig. 8 is a section on the line 8--8 of Fig. 1, 35

are provided in the main body. Figures 9 and 10 are side elevations of a modi- To allow a more or less large piercing of the fied form of the invention showing the parts of folded part of the one piece of fabric, a stop exthe presser foot in two different positions, and tending beneath the under surface of the presser Fig. 11 shows a section on the line ll-H of foot is adjustably fixed to one of the parts of the Fig. 9. 40 subdivided presser foot. The front portion of the presser foot consists This stop which is of the greatest importance of the parts I and 2 which are pivotally arranged for carrying out sewing operations on machines on two

different screws

3 and 4 provided for this adapted to feed off the arm forms an obstacle for purpose with bearing surfaces. The second porthe fabric during withdrawing of the latter, betion of the presser foot having the stitch hole 5 45 cause on the upward movement of the presser for the needle producing the joining seam, confoot this stop, on account of being carried by a sists of the parts 6 and I, which also are pivotally spring actuated portion of the presser foot, is arranged on

screws

8 and 9 also provided for this pressed against the throat plate, whereby the purpose with bearing surfaces.

fabric sewn or joined together is caught by this The two pivots formed by the

screws

8 and 9 stop. are arranged as low as possible in order to obtain In one construction according to the invention a uniform lifting of the parts 6 and I. this drawback is obviated by the fact, that the Each of these four movable parts I, 2, 6 and 1 portion of the presser foot carrying the stop for is provided with a second lever arm I0, I l, I 2

5 adjusting the folded portion may, during lifting and i3 respectively. These lever arms serve as bearings for springs I3, 20, 2| and 22 mounted in the main body I4 of the presser foot. The pressure of these springs may be regulated by adjusting the screws l5, l6, l1 and la. The parts I, 2, 6 and I are, therefore, not only individually movable, but the pressure of each of the single parts upon the work piece is also individually adjustable. Furthermore, a special device is provided for each single part to control the amount of its downward movement. This device for the parts and 2 consists of rail 23 mounted in the main body l4 in which two

screws

24 and 25 are adjustably arranged which bear against the lever arms I and II of the parts I and 2. Each of the parts 6 and 'l is provided with a

third lever arm

26 and 21 respectively, each carrying an

adjustable screw

28 and 23 respectively bearing against the main body l4, whereby the swinging movement of the parts 5 and in a downward direction is limited.

The main body |4 proper of the presser foot has a bore 30 in which the presser foot rod 4| is inserted and is provided with the stitch holes 3| and 32 for the needles producing the cover seam. The main body I4 is further, in well known manner, provided with two resiliently

movable side portions

33 and 34. The spring 35 for these

side portions

33 and 34 is connected to the main body 4 by means of a screw 36 and bears against

pins

31 and 38 arranged in the

movable portions

33, 34. The downward movement of these

portions

33, 34 is limited by a pin 39 (Figures 2, 6 and 8) which is mounted in the main body l4 and extends with its ends into holes 40 which are provided in the said

side portions

33 and 34 and are of considerably greater diameter than the cross section of thepin 39.

Furthermore, the movable part 2 is provided with a recess 42 adapted to receive a stop 44 the position of which may be adjusted and fixed by means of a screw 43.

The stop 44 serves for adjusting the folded portion of the left hand web of the fabric. According to the position of the stop 44, the needle passing through the stitch hole 5 pierces the folded left hand web 54 of fabric in a greater or shorter distance from the fold 55. Thus, as seen from Fig. 11, the stop 44 has been shifted as far as possible towards the part I of the presser foot, so that the needle pierces the web 54 of the fabric as near the fold 55 as possible.

As shown in Fig. 6, the parts and 2 have been lifted by the cross seam, whereas according to Fig. 7 the work piece and the cross seam respectively have been fed and have lifted the

parts

6 and 1, while the parts and 2 rest again on the single thickness of the fabric. As shown in Fig. 8, the pivoted parts I and 6 and the resilient side portion 33, not shown in these figures, rest upon a single thickness of the fabric.

This construction of the presser foot is, of course, also adapted for sewing machines in which the stitch holes for all three needles are arranged in a single plane or in alignment. Under certain circumstances one pair of the movable parts may then be omitted.

The presser foot' according to the invention may also be employed for all kinds of sewing machines, and it is not intended to limit the invention to a presser foot suitable for a sewing machine having an overhanging arm and which is adapted for horizontally feeding the fabric in a direction towards the overhanging arm, as, without departing from the spirit of the invention, the presser foot may also be used in connection with a sewing machine of the kind having an overhanging arm and which is adapted for horizontally feeding the fabric in a direction away from the overhanging arm, 1. e., from the cylinder., In machines of this latter construction, the finished work automatically drops off the cylinder, 1. e., the work falls from the cylinder of the machine as soon as the sewing operation is finished.

The device for lifting the stop 44 on withdrawing of the joined fabric is shown in Figures 9 to 11.

The lever arm ll of the part 2 of the subdivided presser foot, pivotally arranged on the screw 4 and pressed against the fabric by means of the spring 20, projects somewhat beyond the main body l4 of the presser foot and has an inclined surface 45. Connected to the fixed frame of the sewing machine, by means of screws or the like, is a stop 46 the free end of which is directed towards the presser foot and formed as an inclined surface 41 corresponding to the inclined surface 45. A lever 48 is pivoted to the frame of the machine by means of bolt 48 or the like. A ring 50 connected to the presser foot rod 4| by a screw 5| carries a pin 52, and a recess 53, provided in the lever 48, is adapted to cooperate with the pin 52.

In operation, a pressure exerted on the lever 48 or a pressure exerted on the pedal adjusting the presser foot causes lifting of the latter, whereby the inclined surface 45 at the end of the lever arm H is brought in contact with the inclined surface 41 of the stop 46, so that the part 2 of the presser foot is swung against the action of the spring 20, i. e. islifted from the fabric. As soon as the recess 53 of the lever 48 engages the pin 52, the rod 4| is arrested in its elevated position and therefore the stop 44 is held in a position out of the path of the fabric. The stop is prevented from moving against the throat plate of the sewing machine, and therefore cannot form an obstacle for the work piece when the latter is withdrawn from the machine. The two pieces of fabric to be sewn together are fed into the machine under a certain angle and the left hand piece 54 of fabric is bent off in an acute angle, so that the bent edge 55 runs along the stop 44 (Fig. 11). The latter is ad-- justably arranged, so that the position of the bent edge 55 also may be altered, with the result that the material may be pierced at a desired distance from the edge 55. This stop 44 would impede the removal of the fabric from the cylinder, 1. e., the fabric would be caught by the stop. To obviate this disadvantage, the construction of the machine is such, that on lifting of the presser foot an additional swinging movement is imparted to the movable portion of the presser foot together with the stop, whereby the stop 44 is moved out of the range of the fabric which may then easily be stripped off.

What I claim is:

1. A presser foot for sewing machines comprising a main body, three pairs of foot members arranged with their operating parts in a single horizontal plane one behind the other, pivotally arranged levers extending upwardly, one for each of the foot members of the pair arranged furthest from said main body and of the middle pair, each of said levers forming part of its corresponding foot member, springs mounted in said main body, one for cooperation with each of said levers, set screws screwed into said main body,

one for cooperation with each of said springs, 75

a rail provided at said main body, set screws provided in said rail cooperating with said levers forming pa t of said foot members of the pair arranged furthest from said main body and limiting the downward movement of said last mentioned pair of foot members, a rearwardly extending lever forming part of each foot member of said middle pair and a set screw in the end of each of said rearwardly extending levers cooperating with said main body and limiting the downward movement of the foot members of said middle pair.

2. A presser foot asset forth in claim 1 in which two side portions forming the third pair of foot members are yieldingly arranged in said main body and a spring is provided between said main body and said foot members of the middle pair the ends of which bear against said side portions.

3. A'presser foot as set forth in claim 1 in which an adjustable stop adapted to be fixed in position by a screw is arranged in a recess provided in one of said foot members of said pair extending furthest from said main body.

4. A presser foot as set forth in claim 1 in which an adjustable stop adapted to be fixed in position by a screw is arranged in a recess provided in one of said foot members of said pair extending furthest from said main body and means are provided by which, on lifting of the presser foot, said foot member carrying said stop is automatically lifted against the action of its spring.

5. A presser foot as set forth in claim 1 in which an adjustable stop adapted to be fixed in position by a screw is arranged in a recess provided in one of said foot members of said pair extending furthest from said main body and in which said upwardly extending lever forming part of said foot member carrying said adjustable stop is prolonged beyond said main body and provided at its free end with an inclined surface cooperating with another inclined surface provided at a stationary stop fixed to the machine frame.

FRITZ EBERT.