US1718889A - Presser foot for sewing machines - Google Patents

Description

June 25, 1929.

PRESSER FOOT FOR SEWING MACHINES Filed July 9, 1926 ZSheets-Shget l June 25, 1929.

J. BERGER 1.718.889

PRESSER FOOT FOR SEWING MACHINES Filed July 1926 2 Sheets-Sheet 2 ,7 a I. J r 4 l 16g 19 9 J J0 1 39 v Z1 (96 I 4. J9 i W ,5 F 3150: 7 7L ,3 l Z1 Z Z gmemtoz O 33w m aflioznut l atented June 25, 1929.

PATENT OFFICE.

JOSEPH BERGER, OF UTICA, NEW YORK,

ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 015 ILLINOIS.

PRESSER FOOT FOR Application filed July 9,

The invention rclatesto new and useful improvements in a presser foot for sewlng machines, and more particularly to a presser foot for felling.

An object of the invention is to provide a presser foot having a channel extending lengthwise thereof for guiding the fabric sections for felling, with means for engaging the enchained needle thread loops for holding the thread loops during chaining off.

A further object of the invention is to provide a presser foot of the above type wherein the means which holds the thread loops for chaining off, also cooperate with the foot portion of the presser foot in the feeding of the material during the stitching of the seam.

A further object of the invention is to provide a presser foot of the above type which may be used in connection with a multiple needle machine, wherein the devices for engaging the thread loops associated with each needle are independent of each other, so that one of said devices may operate to hold the enchained loops while the other device is cooperating with the remaining portion of the foot in the feeding of the fabric.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of the invention Figure 1 is a side view of a presser foot embodying my invention; 7.

Fig. 2 is a plan View of the same; Fig. 8 1s a vertical sectional view through the presser foot showing one of the chaining fingers in side elevation;

Fig. 4: is a perspective view of one of the chaining fingers, and

Fig. 5 is a sectional view on the line 55 of Fig. 1.

Fig. 6 is an enlarged sectional View through the presser foot, lengthwise thereof, showing one of the stitching fingers in side elevation, and with the material beneath the foot forming the felled seam; and I Fig. 7 is a similar view, but showing the material as passed from the foot, and themachine chaining off.

The presser foot of my invention is particularly designed for felling. Said foot conpivot.

SEWING MACHINES.

1926. Serial No. 121,425.

sists of a bracket portion and a foot portion proper which is pivoted thereto. The foot portion has a channel extending lengthwise and centrally thereof. Said foot portion has an opening or a plurality of openings through which the needle or needles pass during stitching. Located inthe channel and pivoted to the foot portion is a chaining finger. When one needle is used, only one chaining finger is present. When a' plurality of needles are used, then there is a chaining finger for each needle. This chaining finger is pivoted to the foot portion at the rear end thereof, and is substantially flush with the bottom of the foot portion adjacent its A spring carried by the supporting bracket for the foot portion operates on said chaining finger to depress the forward end thereof, and a suitable stop is provided for limiting the downward movement of the forward end of said finger. The forward end of the finger terminates at the needle opening, and in fact, contains a portion of the opening. The lower forward end of the finger is slightly curved so as to aid the finger in riding over the material. There is a solid portion of the throat plate directly in rear of the needle hole through the throat plate, and this finger engages the enchained loops in chaining off, and presses the same against the solid portion of the throat plate, thus clamping the enchained loops and holding the same so as-to form perfect stitches, which are drawn up into a comparatively tight cord of enchained loops. This perfect control of. the enchained loops insures that the stitching shall continue without skipping from one stitched article to another, and this greatly increases the output of the machine. When a plurality of needles are used, then there is a stitch finger for each needle, and they are independently controlled, so that one needle can chain off While the other is stitching, if desired.

Referring more in detail to the drawings,

my improved presser foot consists of a brackv et portion 1 which is secured to the lower end of a presser bar 2 and is held thereon by means of a set screw 3. A foot portion 4 is pivoted at 5 to the bracket 1. Said foot portion is thus free to lift at its forward end to aid in the easy passing of the material beneath the foot.

The foot portion 4 has spaced upstanding side members 6 and 7 which extend up alongside of the lower portion 8 of the bracket 1. The

pivot pin 5 extends through these side portions 6 and 7 and through the lower portion 8 of the bracket 1. Said foot portion has a cross member 9 which is located just beneath the bottom of the portion 8, and when the foot is in horizontal position, this cross portion 9 en-. gages the bot-torn of the portion 8 and limits the further movement thereof. Said foot portion is provided with a channel 10, which extends from the front to the rear end of the foot, and also up along the under face of the bent up toe 11 of the foot. This channel at the front end of the foot is for the purpose of receiving and guiding the interfolded fabric sections for felling. In Fig. 5 I have shown two fabric sections 12 and 13 interfolded at 14 to form a felled seam. I have also shown in this figure the width of the channel in the foot, and these interfolded portions of the fabric extend into the channel, and the side walls of the channel guide the interfolded sections of the fabric, so that the needles will be properly positioned for penetrating the interfolded sections. The presser foot 4 is provided, as shown in the drawings, with two needle holes 15 and 16, as the machine with which this presser foot is intended to be used, is equipped with two needles 17, 17 as indicatedin broken lines in Fig. 1.

Toward the rear of the presser foot, the channel 10 is deepened, and located in the channel are two chaining fingers 18 and 19. These chaining fingers are exactly alike, and it will only be needed to describe one of them. Thechaining finger consists of alower portion 20, an inclined portion 21- and a vertical portion 22. This chainin finger has an opening 23 therethrough, and a pivot pin 24 extendsthrough the side portions of the foot portion 4 and through the opening 23, thus pivotally securing the finger to the presser foot. This pivot is located at the heel or rear portion of the foot, and the bottom of the finger beneath the pivot pin 24 is substantially flush with-the bottom of the foot 4.

The bracket 1 is provided with a'rearwardly extending portion 25. This is provided with slots, one slot for each stitch fin er, and the vertical portion 22 extends up into the slot in the portion 25 of the bracket.- A spring 26 located in the slot bearsat one end against the finger, and at its other end against an ad justable. stop screw '27. This spring normally depresses the forward end of the stitch fin ger. The forward end of the stitch finger is enlarged as indicated at 28, and is provided with a slot or hole 29 which, in conjunction with the hole in the foot completes the needle hole through the foot for the needle. In other words, this stitch finger extends along each side of the needle and terminates at a line near the front'of the needle. The lower forward end of, the finger is curved as indicated at 30. The rear under face of the slot 29 is curved as indicated at 31. The curved portion 30 enables the stitch finger to pass on to the material when it is fed into the machine. The under face of the forward end of the stitch finger at the central portion thereof bears on the enchaincd thread loops between stitched articles. 1

As clearly shown in Fig. 2, the throat plate 36 is provided with feed slots 32, 32, for the sections of the feed dog 37 which engage the fabric beneath the outer side portions of the presser foot. Said throat plate is provided also with a feed slot 33 for the sections of the feed dog 37 which feed the material underneath the presser foot. The throat plate is also provided with feed slots 34, 34 which are directly in rear of the needle holes in the throat plate. There is a solid portion 38 of the throat plate between the forward ends of the slots 34, 34 and the needle holes 39 in the throat plate. The forward end of the stitch finger presses the enchained thread loops S against this solid portion of the throat plate. In Fig. 6 I have shown on an enlarged scale, my improvedpresser foot when operating to form a felled seam. In this figure, I have also shown the throat plate, feed dog, needles and the loopers Z, Z which cooperate with the needles. The stitch forming mechanism is of the usual character and has been illustrated merely to show a little more clearly the position of the threads, particularly during chaining off, and the manner in which the enchaincd threads are clamped against the solid ortion of the throat plate. The needle threads are indicated at n, a, and the looper threads at Z, Z, and the enchaincd thread loops at S. In Fig. 7 of the drawing, I have shown the machine as chaining off, that is,

forming interlocked thread loops between from pulling the enchaincd loops down into' the needle hole and thus disturbing the stitch formation. When, however, there is no fabric, then this anchoring of the thread loops does not take place. The stitch fingers now function to accomplish the holding of the thread loops. As clearly shown in Fig. 7, the stitch finger bears down on the thread loops and .presses the same against the solid portion 38 of the throat plate, and thus it is that the enchaincd thread loops are claniped, and when the needlepasses down through the needle hole on the next. stitch formation and pulls on the threads, the thread loops cannot be drawn down into the needle hole, and therefore, the stitch formation is not interfered with.

The stitch fingers cooperate with the other portions of the presser foot in the feeding of the material during felling. As noted above, the stitch fingers in the region of the pivot 23, are substantially flush with the lower face of the presser foot. The .body portion of the presser foot is pivoted to the shank at 5. The interfolded parts of the fabric forming the fell, lie in the channel at the front end of the foot. The stitch fingers will engage the interfolded parts of the fabric, and will lie in substantially horizontal position. -The rear end of the preser foot will be positioned so that it is at substantially the same level as the upper face of the interfolde d portions of the fabric. This is due to the fact that the stitch fingers are flush with the presser-foot at the rear end and cannot yield relative to the presser foot directly beneath the pivot 24. The forward end of the presser foot, however, will move down so that the sides of the foot along. the channel engage the single thicknesses of fabric at the sides of the interfolded parts of the fabric. This is due to the fact that the heavy spring of the presser bar forcing the presser bar shank downwardly, transmits its pressure to the foot portion directly beneath the pivot 5 which is well in advance of the pivot 24. This brings about a position of the parts so that the interfolded parts of the fabric lie in a channel and are guided and held in interfolded relation until after they are stitched. The channel, in effect, decreases in depth until it finally vanishes at the heel of the foot. When the feed dog rises through the throat plate, the presser foot as a whole, with the parts positioned as described, will 'be raised and the material will be fed by the movement of the feed dog. The stitch fingers at this time are directly above the sections of the feed dog in rear of the needles, and of course, will cooperate with the feed dog in the feeding action.

When. there is no fabric passing through the machine, and the feed dog is lowered, then the main portion of the presser foot will lie in a horizontal position, resting on the throat plate. At this time, the stitch fingers will clamp the enchained thread loops against the solid portion of the throat plate, as has already been described. When the feed dog rises through the throat plate, the presser foot will be raised through the engagement of the feed dog therewith. The yielding stitch fingers will cooperate with the feed dog sections directly in rear of the needles in the' feeding of the enchained thread loops, and at this time, of course, the stitch fingers are lifted from the solid portion of the throat plate by the feed dog sections.

loops are formed, and then the next article passes underneath and is stitched. As the finished article passes from beneath the presser foot, it will, of course, hold the presser foot raised as shown in Fig. 8. At this time, the stitch fingers will bear against the solid portion of the throat plate and hold the enchained thread loops during the stitch formation, and will cooperate with the feeding sections of the feed dog in the feeding of the enchained thread loops. The stitch fingers, at this time, will pass beneath the surface of the main portion of the presser foot, to function as stated. This is all clearly shown in Fig. 3. "When a new article is fed beneath the presser foot, it will raise the presser foot slightly from the throat plate, but at this time, the stitch fingers again pass below the surface of the main portion of the presser foot in the region adjacent the needles, and will clamp the enchained thread loops during stitch formation, and will cooperate with the feed dog in the feeding of the enchained loops until the threads are anchored in the fabric by the needles penetrating the same. It is noted that during the forming of the enchained thread loops, the forward end of the stitch fingers bear against the enchained loops on the solid portion of the throat plate with a pressure derived from the springs 26 and not from the pressure derived from the main operating spring bearing on the presser bar, and therefore, the gripping pressure on the threads is much lighter, and while the enchained loops are gripped sufficiently tight to hold the same, the stitch fingers will not cut the threads.

The presser foot is shown as provided with two stitch fingers. This is for a machine having two needles. It will be noted that these two stitch fingers are side by side and that they fill the channel in the bottom portion of the presser foot as to width. liVhile there are two stitch fingers, there are also two springs, one for each finger, and therefore, the fingers are independent of each other. In certain kinds of felling, the felling seam extends to the edge portion of the garment being stitched and vanishes at the edge, and therefore, itis desirable that one needle shall pass off from the edge of the felling seam before the other. When such an operation is performed, the needle, as soon-as it passes out of the material, with my implate.

It will be noted that the tension on the springs 26 may be independently varied by adjusting either of the screws 27, and thus it is that the pressure of the chaining ofi' fingers may be independently varied or regulated so as to properly control the enchained loops without cutting the thread.

It will be understood, of course, that more than two needles may be used, in which case the presser foot will be changed slightly and will be provided with a needle hole for each needle and a chaining finger for each needle.

It is obvious that minor changes'in the de tails of construction and the arrangement of the parts may be made without departing,

from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters-Patent, is

1. A presser foot for sewing machines comprising a foot portion having a channel extending lengthwise thereof for receiving and guiding the interfolded portions of-the fabric 'rear of the needle opening sections for felling, and means disposed in said channel and constructed so as to move beneath the plane of the bottom of the foot and engage the enchained loops directly in 7 1n the foot for holding the same during cha ning between articles while the fabric is beneath the foot.

2: A presser foot for sewing machines comprising a foot portion having a channel extending lengthwise thereof for receiving and guiding the interfolded portions of the fabric sections for felling, means disposed in said channel and constructed so as to move beneath the plane of the bottom of the foot and engage the enchained loops directly in rear of the needle opening in the foot for holding the same during chaining between articles wh le the fabric is beneath the foot, said means also cooperating at the rear of the foot in the feeding of the material passing beneath the foot during felling to the same extent as the remaining portion of the foot.

3. A presser foot for sewing machines comprising a foot portion having a needle opening and a channel extending lengthwise thereof for receiving and guiding the interfolded portions of the fabric sections for felling, a finger located in said channeland pivoted to said foot portion adjacent. the rear end thereof. said finger terminating at the needle hole in the foot, and means for vieldihgly depressing the forward end of said finger.

4. A presser foot for sewing machines com-' prising'a foot portion having a 'channel extending lengthwise thereof for receiving and guiding the interfolded portions of the fabr c sections for felling, a finger located in said channel and pivoted to said foot portion adjacent the rear end thereof, said finger terminating at the needle hole in the foot, means for yieldingly depressing the forward end of tion adjacent the rear end thereof, said chaining finger terminating at the needle hole in said foot, and a spring bearing against said finger for depressing the forward end thereof.

6. A presser foot for sewing machines comprising a supporting bracket, a foot portion pivoted thereto and having a channel extending lengthwise thereof for guiding the fabric sections for felling, a chaining finger located in said channel and pivoted to said foot adj acent the rear end thereof, said chaining finger terminating at the needle hole in said foot, and a spring bearing against said finger for depressing the forward end thereof, said chaining finger at the forward end thereof having a slot forming a part of the needle hole in the foot so that the forward end of said chaining finger extends alongside of the needle and also in rear of the needle so as to bear upon the enchained thread loops during chaining off directly in rear of the needle:

7. A presser foot for sewing machines comprising a supporting bracket, a foot portion pivoted thereto and having a channel extending lengthwise thereof for guiding the fabric sections for felling, a chaining finger located insaid channel and pivoted to said foot adjacent the rear end thereof, said chaining finger terminating at the needle hole in said foot, a spring bearing against said finger for depressing the forward end thereof, said chaining finger at the forward end thereof having a slotforming a part of the needle hole in the foot so that the forward end of said chaining finger extends alongside of the needle and also in rear of the needle so as to bear upon the enchained thread loops during chaining oif directly in rear of the needle, the forward end of said chaining finger at the under face thereof being curved so as to aid the chaining finger in passing on to the material.

8. A presser foot for sewing machines comprising a supporting bracket, a foot portion pivoted thereto and having a plurality of needle holes therethrough, said foot portion having a channel extending lengthwise thereof on its under face for guiding the fabric sections for felling. independent chaining fingers for each needle pivotally mounted on said foot portion and forming the upper wall of the guiding channel in rear of the needle part of the respective needle holes, said chaining fingers on their under forward edges being curved, a spring for each chaining finger for depressing the forward end thereof, and a stop for limiting the downward movement of the chaining fingers when the press-.21

foot is raised.

9. A presser foot for sewing machines comprising a foot portion, a plurality of independent chaining fingers mounted on said foot portion and adapted to engage cnchained needle thread loops in rear of their respective needles, independent spring means for depressing the forward end of said chaining fingers, and independent means for varying the tension on the respective springs.

10. A presser foot for sewing machines comprising a foot portion having a channel extending lengthwise thereof for guiding the fabi ic sections for felling, a finger located in said channel and pivoted to said foot portion adjacent the rear end thereof, said finger terminating at the needle hole inthe foot-,-

spring means for yieldingly depressing the forward end of said finger, and means for varying the tension on said spring.

11. A felling presser foot for sewing machines comprising a supporting shank and a foot portion pivoted to said shank, said foot portion having a. needle opening therethrough and a channel in its under-face at the forward end thereof disposed so as to receive and guide the interfoldedportions of the felled seam, said foot portion having a substantially flush surface at the rear end thereof, and a portion disposed immediately in rear of the needle opening and adapted to yeildingly c0- operate with a portion of the throat plate for clamping the enchained thread loops in the stitch formation during chaining.

12. A felling presser foot for sewing machines comprising a supporting shank, a foot portion pivoted to said shank, said foot portion having a needle opening therethrough and a channel in its under face at the forward end thereof disposed so as to receive and guide the interfolded portions of the felled seam, said foot portion having a substantially flush surface at the rear end thereof, and a yielding portion disposed immediately in rear of the needle opening and adapted to move to a position substantially flush with the top of the channel during felling and to a position flush with the bottom of the presser foot, or

below the same, for yieldingly clamping the enchained thread loops against the throat plate in the stitch formation during chaining.

In testimony whereof, I atlix my signature.

' JOSEPH BERGER.

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