US2288404A

US2288404A - Presser foot for sewing machines

Info

Publication number: US2288404A
Application number: US301523A
Authority: US
Inventors: George F Kahre
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-10-27
Filing date: 1939-10-27
Publication date: 1942-06-30
Anticipated expiration: 1959-06-30

Description

June 30, 1942. KAHRE 2,288,404

PRESSER FOOT FOR SEWING MACHINES Filed Oct. 2'7. 1939 Patented June 30, 1942 UNITED STATES PATENT OFFICE 11 Claims.

This invention relates to improvements in a presser foot for sewing machines for felling seams and pertains more particularly to means for adjusting the foot when necessary to provide for both sides of the fabric material at the seam, to flow out evenly at the finish, this being a primary object of the invention.

In the use of the present form of presser foot in garment factories, it is seldom that two bundles of seamed articles are run out alike because of the unevenness of the material adjacent the seam, and consequently it is necessary to stretch one side of the material at the seam to make that side even. To avoid this in the use of the present form of presser foot, the operator has to pull on the uneven side of the material and stretch it to an extent whereby it will finish out even during the seaming operation, and quite often this stretching is repeated even when the seam is completed. This stretching often causes the sewing machine to chew and make a very irregular stitch as well as causing the fabric material to slip under the presser foot and cause bending of the needles and in some instances the needles are at times broken. The invention of this application is therefore capable of overcoming this difficulty.

Another object of the invention is to provide a presser foot with means for adjusting the tension of the fabric engaging parts thereof.

A further object is to provide a presser foot with means which are cooperable with the fabric engaging part or parts thereof, to dispose the parts into more or less effective contact with the fabric as may be required with respect to the feed dog of the sewing machine.

Another object is to provide each fabric engaging section of a presser foot with adjustable means.

With the foregoing and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes may be made within the scope of what is claimed without departing from the spirit of the invention.

An embodiment of the invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a side elevation of a fragmentary portion of the presser foot end of a sewing machine showing my improvements applied thereto.

Figure 2 is a plan view partly in section taken approximately on the line 22 of Fig. 1.

Figure 3 is an elevation of the opposite side of the presser foot shown in Fig. 1.

Figure 4 is a longitudinal sectional elevation taken approximately on the line 4-4 of Fig. 2, through the presser foot.

Figure 5 is a transverse vertical sectional elevation taken approximately on the line 55 of Fig. 1.

Figure 6 is an enlarged transverse vertical sectional elevation taken approximately on the line 66 of Fig. 1.

In the drawing, the sewing machine is shown as including a supporting base 8 which extends upwardly in the form of a standard 9 having a needle head I0 carried by an over-hanging portion of the standard and a work supporting arm II which is extended from the standard. A needle bar I2 carrying a set of three needles lZa reciprocates in the needle head I0.

Mounted on the work supporting arm II is a folder I3 of the usual type and disposed in said arm is a feed dog I4 having fabric engaging sections I5 and I6. The machine as shown, is of the type illustrated in Christensen et al., U. S. Patent 1,741,095, and further description of the machine is not thought necessary.

The presser foot I! consists of a front section I8 and a rear section I9 which are disposed in tandem above and in proximity to the feed dog I I, the front section III being pivoted on one side at 20 to an arm 2| of a yoke 22 and on its other side is pivoted at 23 to an adjustable bearing 50.

' The rear section I9 of the presser foot is pivoted on one side at 25 to the arm 2| of the yoke 22 and on its other side is pivoted at 26 to the arm 24, and the yoke 22 is in turn secured to the shank 21 by a pivot 28 engaging the arm 2! of the yoke and the shank, and a pivot 29 engaging the arm 24 and an adjustable bearing 33.

The bearing 50 has an upwardly extending stem 3! which is seatingly engaged in a tubular adjusting screw 32, said screw 32 having exterior threads 33 which engage interior threads formed in a boxing 34, secured to or formed integral with the arm 24 of the yoke 22.

The shank 21 is mounted on the lower end of the presser bar 35 which is depended from the needle head I 0, said presser bar having the usual spring associated therewith which forces the presser foot I1 into yielding contact with the fabric sections to be seamed.

The rear section I9 of the presser foot I! is provided with a channel 36 and mounted therein is a shiftable plate 3'! which is fixed to the lower end of a threaded stem 38 which passes through an opening in the section [9, and engaged on the threaded end of said stem is an adjusting nut 39 which is held in adjusted position by the spring 49 which is secured to the rear end of the section H) by the screw 41.

The shiftableplate 31 is adapted to yieldably engage the sewed or threaded seam portion of the fabric immediately after the seam has been stitched by the set of reciprocating needles lZa which operate through respective elongated openings E2 in the front section H! of the presser foot IT. The channel 33 of the rear section IQ of the presser foot provides side disposed runners 43 and M thereon and runners 45 and G6 are similarly formed on the front section M3 for cooperation with the feed dog l4 on the fabric to be seamed.

Secured to or formed integral with the shank 21 is an interiorly threaded boxing ll, and engaged therein is a tubular adjusting screw till and seated in said screw the approximate length thereof, is a stem 49 which extends upwardly from the bearing 38 which is pivotally mounted at 29 to the arm 24 of the yoke 22. Disposed on the outside of the boxing 47 is a resilient locking rod 5!, the extending end of which cooperates with notches 52 which are formed in the periphery of a flange at the upper end of the adjusting screw 58.

In operation, the material is drawn through the folder I3 and delivered to the stitching mechanism of the sewing'machine by the feed dog l4 having fabric engaging sections l5 and It. As best shown in Fig. 6, the fabric section 55 is folded over as designated at 56 and the fabric section 51 is under folded as indicated at E3, and it is these folded portions which are interengaged for the forming of the felled seam 59. These inter-folded parts of the fabric sections lie between the sections i5 and it of the feed dog is and are not engaged thereby, the main feeding of the fabric sections 55 and 5'1 being carried on by cooperation of the feed dog sections 55 and iii with respective runners of respective sections it and is of the presser foot ll.

In the pulling or feeding operation of the feed dog on the material, it quite often happens that the seam does not run out evenly and which defect occasions the operator to hand stretch the material on one side of the seam in order for the seam to finish out evenly and often after the seam is completed. During stretching of the material, this often causes the machine to chew and to make a very irregular stitch due to the material slipping under the presser foot and which will cause bending of the needles and often the needles are broken.

This invention therefore is adapted to overcome the defect of the material slipping during feeding, and causing irregular or uneven seams by providing proper tension on both sides of the presser foot, one of the requirements being to first set the presser foot ll squarely on the material by manipulation of the screw :28 on the hearing 30 for adjusting the yoke which carries the front and rear sections it and is respectively.

When slippage of the material during feeding occurs, which often is due to the texture or grade of the material, the front section it which embraces the needles !2a is adjusted by the operator manipulating the screW 32 to force the bearing 58 downward to cause that side of the section l8 carrying the runner 45 to more tightly bear against the fabric section 51 thereby pressing said fabric section firmly against the section It of the feed dog Hi, thus increasing the biting efficiency of the feed dog on the fabric section 5i by reason of closer contact of the runner 46 thereon and causing the dog Hi to feed faster or to a degree wherein the material will flow or be fed more firmly beneath the presser foot to obtain an even stitching and so that both sides of the seam will run out even at the finish.

At times when adjusting the front section it of the presser foot, it may be found necessary to adjust the rear section if? by manipulation of the screw G8 thereof against the bearing 30 to regulate the engaging contact of the runner id on the fabric section 5? to a degree as may be required, by the amount of adjustment given to the front section E8 in order to assure evenly alined feeding of the fabric sections which are being seamed.

The adjusting screw 32 of the front presser foot section It is also provided with a resilient rod 53 for locking cooperation with the notches 56 formed in the flanged end of the screw.

Obviously, retrograde turning of the adjusting

screws

32 and 43 will accordingly release the runner engaging pressure given to respective sections I8 and [9.

In adjusting the sections it and IQ of the presser foot ii in the manner as described, sufficient tiltable movement for the adjustment is provided by the

pivots

20 and 28 of the yoke 22, it of course being understood that the amount of adjustment required is relatively small. Relatively long bearing support for the stems 3! and E9 of respective bearings and 39 is provided in respective tubular adjusting

screws

32 and 48 by reason of the relative lengths of said stems and adjusting screws. The stems 3i and d9 of respective bearings 56 and EQ obviously in a sense, provide adjusting legs for respective fabric engaging sections l8 and i9.

What I claim is:

1. A presser foot for a sewing machine comprising a rockable yoke, a fabric engaging section rockably secured to said yoke, and adjustable means carried by said yoke and having cooperable connection with one side of said section,

2. A presser foot for a sewing machine having a ycke, a fabric pressing section pivoted on one side to said yoke, and an adjustable bearing carried by said yoke and pivoted to the other side of said section.

3. A presser foot for a sewing machine having a yoke, a fabric pressing section pivoted on one side to said yoke, and a screw-adjustable bearing carried by said yoke and pivoted to the other side of said section.

4. A presser foot for a sewing machine having a yoke, a fabric pressing section pivoted on one side to said yoke, and an adjustable bearing having slidable connection with said yoke and having pivotal connection with said section in alinement with the pivot on the other side of said section.

5. A support for a presser foot section comprising a shank, a yoke rockably secured on one side to said shank, and a bearing adjustably carried by said shank and pivotally secured to said yoke.

6. A presser foot for a sewing machine having a shank, a yoke rockably secured on one side to said shank and on its other side to an adjustable element borne by said shank, and a fabric engaging section rockably secured to said yoke.

'7. A presser foot for a sewing machine having a shank, an element adjustably secured to said shank, a yoke rockably secured on one side to said shank and on its other side to said element, and a fabric engaging section rockably secured to said yoke.

8. A presser foot for a sewing machine having a shank, an element adjustably secured to said shank, a yoke rockably secured on one side to said shank and on its other side to said element, and a pair of fabric engaging sections carried by said yoke, one of said sections being adjustably secured on one side to said yoke.

9. A support for a presser foot comprising a shank, a yoke having pivoted bearing connection with said shank, said bearing connection having a stem and a tubular screw element mounted thereover and said screw element being screwseated in said shank.

10. A presser foot for a sewing machine having a shank, a yoke rockably secured to said shank, a fabric engaging section having pivotal bearing connection with said yoke, said bearing connection having a stern, and a tubular screw element borne by said yoke and mounted over said stem for providing adjustment to said section.

11. A presser foot for a sewing machine having a shank, an element adjustably secured to said shank, a yoke rockably secured on'one side to said shank and on its other side to said element, and a fabric engaging section rockably secured to said yoke and having adjustable cooperation therewith.

GEORGE. F. KAHRE.