US3093101A

US3093101A - Auxiliary lifter arm for presser foot on sewing machines

Info

Publication number: US3093101A
Application number: US41853A
Authority: US
Inventors: Anestis C Foltis; Kraft Martin
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-07-11
Filing date: 1960-07-11
Publication date: 1963-06-11
Anticipated expiration: 1980-06-11

Description

June 11, 1963 A. c. FOLTIS ETAL 3,0

AUXILIARY LIFTER ARM FQKPREssER FOOT on SEWING MACHINES Filed July 11, 1960 I6 I l3 2. Z 'INVEN'EORS' Z0 ANESTIS c FOLHS MARTIN KRAFT 27 BY ATTOR United States Patent r 3,093,101 AUXILIARY LIFTER ARM FOR PRESSER FOOT 0N SEWING MACHINES Anestis C. Foltis, New York, N. (40-40 Hampton St., Jackson Heights, Long Island, N.Y. and Martin Kraft, New York, N.Y., (2427 64th St., Brooklyn, FLY.)

Filed July 11, 1960, Ser. No. 41,853 2 Claims. (Cl. 112-237) Our invention relates to an improvement in arms for momentarily lifting the presser foot that engages the cloth on a sewing machine, so as to facilitate adjustments of the cloth while it is being stitched, and then allow the presser foot to be quickly dropped back to its regular operating position.

The conventional sewing machine is constructed with a head in which the needle operating rod or spindle and the rod or bar carrying the presser foot at one end, are mounted for vertical movement. The presser foot normally held down by a compression spring, can be lifted by means of an arm at one side of the head and held up by the end of the arm until it is again released when the arm is moved back to its starting position. However, on many occasions the presser foot need be lifted for only a brief instant to enable the operator to shift slightly the cloth that is being stitched, and the regular arm provided for this purpose is so connected to the presser foot rod that it is not well adapted to raise and lower this rod for the quick adjustments that are frequently needed.

The principal object of our invention is to equip the operating head of a sewing machine with an auxiliary lifter arm by which the presser foot rod can be more quickly raised and lowered when fabric is being stitched, and thus time is saved and the operator of the machine is enabled to turn out more work in a given period.

Another object of this invention is to provide such an auxiliary lifter arm that can be readily combined with the rods or spindles carrying the needle and the presser (foot, and yet require only small additions to the general construction.

The objects and advantages of the invention are fully set forth in the ensuing specification and the novel features are defined in the appended claims. The drawings illustrate several embodiments of the invention, but various changes in structural details may of course be made without departure or material alteration of the main design in which the invention resides.

On the drawings:

-FIGURE 1 is a front view of the operating head of a sewing machine in which the needle operating bar or rod and the presser foot bar or rod are vertically mounted, with the presser foot rod operably by the lifter arm of our invention.

FIGURE 2 shows in side view another form of auxiliary arm for lifting the presser foot.

Referring first to FIGURES 1 and 2, the numeral 1 indicates the head of a sewing machine, which is at one end of a horizontal casting, not shown; and is hollow, or shaped with a recess 2 surrounded by a rim 3. The operating rod 4 for the needle at its lower end and the rod 5 with the presser foot 6 at its lower end are both mounted for vertical movement in bores at the lower part of the head 1. This head receives within it one end of the operating shaft 7, which is rotated by a motor or other actuating means not shown on the drawings. On the extremity of the shaft 7 within the head 1 is a fixed disk 8 connected by a link 9 pivoted thereto and united by a pivot pin 10 to a fixed sleeve or bushing 11 on the rod 4; and as the shaft 7 turns, the disk 8 rotates Patented June 11, 1963 "ice and the needle shaft 3 is raised and lowered to make stitching strokes.

The rod 5 carrying the presser foot 6 has a fixed head or projection 12 mounted thereon, and this projection is engaged by a cam 13 on an arm 14 pivoted to the head 1 on a pin 15. By using the first finger on the left hand to raise the arm 14, the operator facing the head 1 can always lift the presser foot rod 6 moving the arm 14 outward and upward so that the cam edge will move on the pin 15 and lift the rod 5. Part of the edge 16 of the cam does the lifting, and the remaining part 17 of the edge of the cam holds the rod 5 elevated until the arm 14 is depressed. A spring 18 encircling the rod between the projection 12 and the top of the head tends to depress the rod 5. FIGURE 1 depicts the arm 14 in readiness to elevate the rod 5.

For many adjustments of the cloth on the machine, which is being sewed, it is necessary to keep the rod 5 lifted for a definite interval; and to lower it, the arm 14 must be turned down to release the rod 5. But when an adjustment of the cloth is small and may be quickly made, considerable time would be lost over an extended period if the arm 14 were relied upon very often for this purpose. Therefore, in order to be able to make minor adjustments of the cloth more quickly, we connect to the arm 14 near the cam 13 an auxiliary arm 19 which extends down and then to the right behind the

rods

4 and 5. The end of this arm 19 may have a knob or be otherwise shaped so that it can be easily engaged by the operator and depressed, but only far enough to move the arm 19 down to a point Where the rod 5 will be lifted to a slight extent, so that the cam 13 will be moved over only part of its range; and when the arm 19 is released, the spring 18 which encircles the rod 5 will immediately force the rod 5 downward and cause the presser foot 6 to resume its operating position. To actuate the arm 19, the operator of the machine presses down on the free end of the arm 19, and may very conveniently use the thumb of the left hand for this purpose. The arm 19 can be afiixed to the arm 14, for example, by Welding.

FIGURE 2 shows an arm 20 which has one end so bent at 21 that it can be made to grip the arm 14 and be secured thereon by a binding screw 22. This arm 20 will be located as before behind the two

rods

4 and 5 and is under the head 1, extending to the right, and will serve the same ends as the arm 19.

It will be seen from the drawings that when the operator wishes to raise the rod 5 with the arm 14, the fingers of the left hand can be used. If the arm 14 is not to be lifted and the auxiliary arm is required, the thumb on the left hand of the operator can engage its auxiliary arm and lower it.

Having described my invention, what we believe to be new is:

1. A head for a sewing machine having a pair of vertically movable rods mounted therein, one of said rods carrying a presser foot for engaging cloth to be sewed on the machine, and the other rod being adapted to bear a needle, an arm on said head for raising the rod having the presser foot, and a second arm mounted adjacent the first-named arm and connected thereto for lifting the presser foot, one of said arms being at one side of the said rods and the second-named arm extending behind said rods to the other side thereof.

2. A head for a sewing machine having a pair of vertically movable rods mounted therein, one of said rods carrying a presser foot for engaging cloth to be sewed on the machine, and the other rod being adapted to bear a needle, an arm on said head for raising the rod having 3 the presser foot, and a second arm mounted adjacent the first arm for lifting the presser foot, one of said arms being at one side of said rods and the second-named arm extending behind said rods to the other side thereof, the second-named arm being affixed to the first-named 5 arm.

References Cited in the file of this patent UNITED STATES PATENTS Opacity Mar. 2, Taft Aug. 7, Wenzel June 3, Kaier July 29,

Ayres May 27,

Claims

1. A HEAD FOR SEWING MACHINE HAVING A PAIR OF VERTICALLY MOVABLE RODS MOUNTED THEREIN, ONE OF SAID RODS CARRYING A PRESSER FOOT FOR ENGAGING CLOTH TO BE SEWED ON THE MACHINE, AND THE OTHER ROD BEING ADAPTED TO BEAR A NEEDLE, AN ARM ON SAID HEAD FOR RAISING THE ROD HAVING THE PRESSER FOOT, AND A SECOND ARM MOUNTED ADJACENT THE FIRST-NAMED ARM AND CONNECTED THERETO FOR LIFTING THE PRESSER FOOT, ONE OF SAID ARMS BEING AT ONE SIDE OF THE SAID RODS AND THE SECOND-NAMED ARM EXTENDING BEHIND SAID RODS TO THE OTHER SIDE THEREOF.