US1118059A - Feed-actuating mechanism for sewing-machines. - Google Patents

Description

. M. SANDT. I FEED ACTUATING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED OUT. 19, 1912.

1,118,059. Patented Nov. 24, 1914.

lnven/or: w s Max.

THE NORRIS PETERS 60.. PHOTO-LITHO. WASHING rON. D. C.

UNITED STATES PATENT. OFFICE.

MAX SANDT, or IBIELEFELD, GERMANY, Assren'on T FIRM BIELEFELDER Mason-.

NENFABRIK VORMALS DURKOPP & COi, BIELE'FELD, OF BI ELEF ELD,

GERMANY.

FEED-ACTUATING MECHANISM ronsEWI NG-MAcHrnEs.

To all whom it may concern:

Be it known that I, MAX SANDT, a citizen of the Empire of Germany, residing at Kaiserstrasse 165, Bielefeld, Germany, have 5 invented certain new and useful Improvements in F eed-Actuating Mechanism for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

For the setting or adjusting devices for the feed mechanism of sewing machines as hitherto constructed lever mechanisms of many different descriptions have been employed located in the casing of the machine and actuated from the shaft in connection with the arm.

According to the present invention the whole of these intermediate parts are dispensed with: all the parts for controlling the variations in length of the stitch being located in the simplest manner upon and around the shaft in connection with the arm. 1

The invention is illustrated on the accompanying drawing in which Figure 1 is a vertical section taken at right angles to the shaft in connection with the arm; Fig. 2 is a view partly in section in the longitudinal direction of the shaft in connection with the arm.

I) is an eccentric mounted on the shaft a in connection with the arm. This eccentric works in a sliding block 0. The block 0 in turn works in a guideway c with parallel sides formed in the head (Z of the actuating rod. At the other side the head of the actuating rod is formed with a cylindrical 4 boss 0 which in turn works in a guideway 6 with parallel sides formed in a part f located in the casing of the machine and .centrally disposed with respect to the shaft .11. Attached to the part f provided with the guideway e is a setting handle 9 by means of which it is possible to fix the part f in the desired position.

The operation is as follows :-Beneath the plate of the sewing machine are located, in a known manner, the pushing or rocking spindles for transmitting the movements to the feed. The actuating rod (Z operates one of these spindles. As soon as the eccentric b on the shaft in connection with the arm is set in motion, it communicates Specification of Letters Patent. Patent d NOV 24 1914 Application filed. October 19, 1912. serial No; 726,708. a

a backward and forward movement to the actuatmg rodrZ and the head (5 of the gulde rod, whlle the sliding block 0 moves -up and down in the guideway with parallel sides located in the rod. v

If the part f provided with the guideway e is so set that the plane passing through its middle line is perpendicular to the plane 0Z passing through the axis of the actua-t-' mg rod (Z it is obvious that no movement is communicated to the transmission shafts or spindles located at the lower part of the machine casing all that is produced is a I rocking movement around the point where the actuating rod al is jointed to the feed rollers. If now the part f with its parallel guideway e is moved by means of the setting screw 9 so as to bring the middle line e of the path into some angular position which is greater orsmaller than 90, the result is that in addition to the swinging motion of'the boss-like projection e on the head (Z of the actuating rod, the inclination head of the actuating 60 of the guidewaye causes the actuating rod (Z and the head thereof to have an up and down movement depending upon the angle. The smaller the angle becomes starting from 90 the greater is the upward and downward movement of the actuating rod (Z and the greater the movement trans- I mitted to the feed mechanism, that is to say the length of the stitch depends upon the angle. If the adjusting screw 9 is set above the neutral line, where no motion is transmitted, the feed mechanism moves in the forward direction, but if the setting screw is turned through the neutral line and to some lower position a reversal of the direction of motion is the result and the device moves backward.

What I claim and desire to secure by Let? ters Patent of the United States of America 1s 1. In a device of the type described the combination of a casing, a shaft rotatably mounted in said casing a guide way centrally and rotatably mounted on said shaft, a feed actuating-rod having an opening in the head thereof, larger than said shaft and through which said shaft extends, a boss on one side of said head adapted to coact with said guideway, an eccentric secured to the shaft, a guideway formed on the opposite side of said head in which said eccentric 110 operates and means for adjusting the inclination of said first mentioned guideway.

2. In a device of the class'set forth the combination of a shaft, an eccentric mounted on said shaft, an actuating rod for the feed provided with a head formed on one side with a guideway for said eccentric and on the other side with a circular boss, located substantially concentrically with respect to the shaft, a second guideway in connection. With the casing for the reception of the aforesaid boss and mounted loosely around the said shaft, and means for adjusting the inclination of said second guideway as and for the purpose set forth.

In testimony whereof, I affiX my signature, in presence of two Witnesses.

MAX SANDT.

Witnesses:

FRANK A. PUTNAM, VVILLY ARIDLY.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, i Washington. I). C.

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