US1275387A - Presser-foot for sewing-machines. - Google Patents

Description

- .I. E. CH ALMANL messes FOOT ro'n SEWING MACHINES.

APPLICATION FILED MAY 6, I914- Patented Aug. 13, 1918.

UNITED' STATES PATENT OFFICE.

JOHN E. CHALMAN, OF CHICAGO, ILLINOIS, A SSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRESSER-FOOT FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Aug. 13, 1918.

Application filed May 6, 1914. Serial No. 836,710.

T 0 all whom it may concern:

Be it known that L'Jonx E. CHALMAN, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Presser-Feet for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and .to the figures of reference marked thereon.

The invention relates to new and useful improvements in a presser foot for sewing machines, and more particularly to a presser foot which is so constructed that connecting rows of stitches may he made between articles and the enchained loops properly held and fed from the machine.

The object of the invention is to provide a presser foot of the above character with an auxiliary portion which engages the enchained loops and presses the same against the work support when there is no material in the machine, so as to prevent the looper from drawing the loops back into the needle throat andthus prevent chaining-off.

A further object of the invention is to provide a presser foot of the above character with an auxiliary portion which is so constructed and arranged that when a piece of material to be stitched is fed underneath the presser foot and the main foot raised or tilted thereby, the auxiliary foot still cooperates with the work support and feed dog in holding and feeding the chain of loops which connect the previously stitched material to the material passing underneath the foot.

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

In the drawings which show by way of illustration one embodiment of the inven tion- Figure l is a vertical sectional view through a presser foot embodying my improvements and showing the auxiliary feed dog holding the enchained loops as an article which has been stitched is passing from underneath the foot;

Fig. 2 is a similar view, showing the main portion of the presser foot and the auxiliary portion of the presser foot engaging the ifnaterial which is being fed underneath said oot;

Fig. 3 is an enlarged detail, showing the auxiliary foot and the manner of clamping and holding the loops during chaining-off;

Fig. 4 is a view similar to Fig. 1, showing the main presser foot tilted when the material is first fed underneath the foot and the auxiliary feed dog holding the chain of stitches until the needle engages the material;

Fig. 5 is a and Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

My improved presser foot consists of a supporting shank 1, which is adapted to be clamped to the presser bar 2 in the usual manner. The main foot portion 3 is pivotally secured thereto by a bolt 4. Said main foot portion is provided with an upwardly inclined forwardly projecting toe 5 and an upwardly inclined rearwardly projecting heel 6. Said main foot portion, centrally thereof, both longitudinally and transversely, is formed with a slot 7 in which is locateu an auxiliary foot 8. A bar 9'bridges the slot 7 at the rear end thereof and is secured to the main portion thereof. The auxiliary foot 8 is pivoted to a stem 10, which extends through an opening in the bar 9. A spring 11 fixed to the main portion of the presser foot bears on the upper end of this stem 10 and normally forces the auxiliary foot downward. A pin 12 extends through the stem and is adapted to engage the upper face of the bar 9 to limit the downward movement of the foot.

This auxiliary foot is cut-away slightly at the rearencl thereof, as at 13. The front portion of the foot is turned up, as at 14, and said auxiliary foot has a needle throat 15 extending therethrough. The stem 10 extends into a recess 16 in the upper side of the auxiliary foot and a pivot screw 17 passing through the stem pivots the foot to the stem. This recess is so formed that the auxiliary foot may oscillate on said stem. The extreme end 18 of the toe of the auxiliary foot is adapted to engage the main presser foot when the auxiliary foot is deplan view of the presser foot;

' pressed to the limit of its downward movement, as clearly shown in Fig. 1.

The work support is formed with a slot '19. through which extends a feed dog 20,

foot, as indicated in dotted lines at 21, in Fig. 5. Said main foot may alsoengage the material directly in rear of the auxiliary foot. Said work support directly in rear of the feed slot 19 is formed with a solid portion 22 which cooperates with the auxiliary presser foot.

One purpose of the auxiliary presser foot is to press the enchained loops of thread on to the work support and feed dog 20, while an article is being fed out of the machine, as shown, for example, in Fig. 1, when the fabric being stitched passes beyond the needle. If there were no auxiliary feed foot, the enchained loops would not be clamped against the work support, as the enchained loops are of less thickness than the material being stitched and the main foot-is held raised from the work support by the material which is still under the rear part of the foot. Vith my improved auxiliary presser foot, at this time said auxiliary presser foot is forced downward by the spring 11 and said foot engages the enchained loops and presses the same against the work support and the foot also cooperates with the feed dog 20 in feeding these enchained loops. The clamping of the enchained loops, as shown in Fig. 3, prevents the looper when moved laterally to avoid the needle from drawing the previously enchained loops through the slot in the work support, which would prevent the feeding of the loops. The auxiliary presser foot, therefore. serves as a means for holding and feeding the enchained-loops as the material leaves the machine. This auxiliary foot is yielding and, therefore, when the material being stitched is engaged by the needle. said auxiliary portion of the foot will be raised into the slot in the main foot and will operate as a part of the main presser foot.

Another purpose of the auxiliary foot is to feed the enchained loops when an article to be stitched is inserted underneath the presser foot. As the article is fed under the presser foot, as shown in Fig. 4, the main presser foot is tilted. The auxiliary foot will at this time also be tilted and the heel of the auxiliary foot will engage the enchained loops and hold the same on the work support during the interlocking of the loops of the needle and looper until the material has reached the point where it is engaged by the needle.

It is obvious that minor changes in the detail of construction and arrangement of parts may be made without departing from the spirit of the invention. as set forth in the appended claims.

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

1. A presser foot for sewing machines, including in combination, a main foot. having a slot formed.therethrough, centrally there of, an auxiliary footlocated in said slot, a stem slidably mounted on said main foot to which said auxiliary foot is pivotally attached, means for yieldingly depressing said auxiliary foot, whereby the same may be moved a limited distance beneatlrthe work engaging surface of the main foot, and means for limiting the downward movement of the auxiliary foot, said auxiliary foot having a needle opening therethrough.

2. A presser foot for sewing machines, including in combination, a main foot, a shank to which the main foot is pivotally attached, said main foot having a slot formed therethrough centrally thereof, an auxiliary foot located in said slot, a stem slidably mounted on said main foot to which said auxiliary foot is pivotally attached, a spring for yield ingly forcing said auxiliary foot downward. a stop for limiting the downward movement of the auxiliary foot. said auxiliary foot having a needle opening therethrough and its. work engaging face terminating in rear of said needle opening.

3. A presser foot for sewing machines, in

cluding in combination. a main foot, a shank to which the main foot is pivotally attached, said main foot having a slot formed therethrough centrally thereof, an auxiliary foot located in said slot, a stem slidably mounted on said main foot to which said auxiliary foot is pivotally attached, a s ring for yieldingly forcing said auxiliary oot ownward, a stop for limiting the downward movement of the auxiliary foot, said auxiliary foot having a needle opening therethrough and its work engaging face terminating in rear of said needle opening, the front portion of said main foot and said auxiliary foot being inclined upwardly to facilitate the passing of the material underneath the same.

4. The combination with a work support having a needle opening therethrough and a solid portion in rear of the needle 0 ening, a feed dog having a section thereo located in rear of the needle and said solid portion of the work support, a main presser foot, means for supporting said main presser foot, said main presser foot having a slot therethrough centrally thereof and extending from a point in rear of the solid portion of the work support to a point in front of the needle, an auxiliary presser foot located in the slot in the main presser foot and bodily movable below the work engaging surface of the main presser foot, said main presser foot being connected to its supporting means, whereby the same may tilt upward at the forward end thereof when the material passes underneath said foot.

5. The combination with a. work support having a needle opening therethrough and a solid portion in rear of the needle opening,

a feed dog having a section thereof located of the work support, a main presser foot,

means for supporting said main presser foot,

said main presser foot having a slot therethrough centrally thereof and extending from a point in rear of the solid portion of the work support to a point in front'of the needle, an auxiliary presser foot located in the slot in the main presser foot below the work engaging surface of the main presser foot, said main presser foot being connected to its supporting means, whereby the same may tilt upward at the forward end thereof when the material passes underneath said foot, said auxiliary presser foot being pivoted to its supporting means was to be capable of tilting when the material passes underneath the same, and having a needle opening therethrough.

6. The combination with a work'support having a needle openin therethrough and a solid portion in rear of the needle-opening, a feed dog having a section thereof located in rear of the needle and said solid portion of the work support, a main presser foot,

means for supporting said main presser foot, said main presser foot having a slot therethrough centrally thereof andextending from apoint in rear of the solid portion of the work support to a point infront of the needle, an auxiliary presser foot located in the slot in the main presser foot below the work engaging surface of the main presser foot, said main presser foot being connectedto its supporting means, whereby the same may tilt upward at the forward end thereof when the material passes underneath said foot, said auxiliary presser foot being pivoted to its supporting means so as to be uga pable of tilting when the material passes underneath the same, and having a needle opening therethrough, both the main presser foot and the auxiliary presser foot being inclined upwardly from a point adjacent the needle.

In testimony whereof, I aflix my signature-in the presence of two witnesses.

JOHN E. CHALMAN. Witnesses: Y

J. LATNER,

A. F. BnEnsnALL.

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