US1118417A - Sewing-machine. - Google Patents

Description

J. HEBERLING.

SEWING MACHINE.

APPLICATION FILED JUNE 20,1013.

1,1 18,417. Patented Nov. 24. 1914.

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SEWING MACHINE.

APPLICATION FILED JUNE 20.1913.

1,1 18,417, Patented Nov. 24, 1914.

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I "Illa """w'muum' Z2 IHIIIIH JOHN HEBERLING, OF ROCHESTER, NEW YORK.

SEWING-.MACHINE.

Specification of Letters Patent.

Patented Nov. 24:, 1914.?

Application filed June 20, 1913. Serial No. 774,809.

and useful Improvement in Sewing-Ma chines, which improvement is fully set forth in the following specification and shown in the accompanying drawings.

The present invention relates to sewing machines of the type employing a recipro catory needle bar having a dip and dwell therein for the formation of a loop for the passage of a reciprooatory or vibrating shuttle, an object of this invention being to provide a needle bar mechanism which is inexpensive to manufacture, noiseless in are tion, and which obtains its greatest force during the passage of the needle through the pods.

a Another object of this invention is to provide a take-up device which. supplies the necessary amount of thread during the passage of the shuttle throughthe loop without giving an over-supply which'is liable to become entangled.

To these and other ends the invention consists in certain parts and combinations of parts all of which will be hereinafter de scribed, the novel features being pointed out in the appended claims.

In the drawings: Figure 1 is a front end view of the head at the end of the bracket arm; Fig. 2 is a vertical section throughthe head showing the needle bar mechanism and take-up device in elevation; Fig. 3 is a view of the needle bar mechanism with the head plate removechthe needle bar mochanism being in the position which it assumes when the needle bar is in it's uppermost position; Fig. 4 is a view similar to Fig. 3 except that the needle bar mechanism is shown in the position which it assumes when the needle bar is in its lowermost position; Fig. 5 is a view similar toFigu3 showing the needle bar mechanism at the beginning of the movement during which the loop is being formed for the passage of the shuttle; and Fig. 6 is a view similarto Fig. 3 showing the lowermost position of the needle bar during the passage of the shuttle through the loop.

Referring more particularly to the drawings, 1 indicates a portion of the bracket arm which may be of any suitable construction, having at its free end a head 2 providedgvith a chamber in which the needle bar mechanism is arranged.

Journaled in the bracket arm 1 is a rotary driving shaft 3 provided at its for ward end with a crank consisting, as herein shown, of a disk 4 provided with a crankpin or wrist-pin 5. To the wrist-pin 5 is ointed one end of a lever 8 pivoted near its middel at 9 to the outer or free end of a swinging link 7 which is pivoted at 6 to the one side of the head or frame 2, preferably at a point above the horizontal plane of the driving shaft3, said lever being jOlIltGCl at ts other end at 11 to the upper end of a pltman 10 which is jointed at its lower end at 12 to the needle-bar 13 reciprocat-mg in a guide or bushing 14 mounted in the head 2, said needle-bar carrying at its lower end the needle15. In the construction of the invention as herein illustrated the distance between the axis of the pivot 6 and the axis of the pivot 9 is slightly greater than the distance between the axis of the said pivot and the axis of the driving shaft 3. Also the distance between the axis of the crank-pin or wrist-pin 5 andthe axis of the pivot 9 is preferably slightly greater than the distance between theaxis of the said crank-pin or wrist-pin and the axis of the driving shaft 3. By virtue of this arrangement of the pivots 5, 6 and 9 relative to the axis of the driving shaft 3, the axis of the pivot9, when the needle-bar is at its lowest position, occupies a point which is slightly above the axis of the shaft 3, as will be seen by reference to Figs. 5 and 6.

The needle operates through a bed 16 of any suitable construction and cotiperates with areciprocatory or vibrating shuttle 17 located below the bed and operated in a well known manner. The cloth is held by the usual presser foot 23 carried by the presser bar 18 controlled by a cam lever 19 which cooperates with the end of a bar 20 guided in the head,the presser foot being moved to its lowermost position by a spring 21. Also arranged on the bar 20 is a guide 22 for the thread which leads from the tension device 24 after being passed through an opening 23 in the plate 24 which closes the chamber of the head 2.

Another feature of this invention is the take-up device which embodies an arm; 25 extending laterally and forwardly from the pitman link 10 in proximity to the lower pivot of the latter and thence outwardly at 26 through a straight slot 27 in the face plate 24?, the outer end of the arm being provided with an opening 28 having a lateral entrance slot through which the thread is introduced into the opening 28. In other words the take-up arm 25 is attached to the pitman 10 in proximity to the pivotal connection of the latter with the needlebar 15.

Assume the parts are in the positions shown in Fig. 3, a rotation of the crank 4: in the direction of the arrow in this figure will. move the crank or wrist pin to the right and exert upon the pivot 11 a substantially straight and downward pull until the parts reach the positions shown in Fig. 4. As this movement of the pitman is substantially straight, it communicates to the needle bar a powerful movement while the needle is entering the goods. After the goods have been penetrated by the needle, the lever S isjswung on its axis to swing to the left at, its lower end and swings the upper end of the pitman to the right or forwardly on an are which has the effect of raising the needle bar slightly to the position shown in Fig., 5 order to form loop through which the shuttle IT is to pass. During this movement of, the pitman link 10, the thread guide opening 28 of the take-up arm 'tilts downward, with the swinging pitman 10 from the position shown in Fig. 4, thus payt, ing out; a certain. amount of thread. A further movementof the upper end of the pitlQlto theright then follows, causing the needle barand needle to make adip or slight downward movement, the dwell position of whichis shown in Fig. 6, During this dip 40 or downward. movement,- the thread guiding portion 26 of the take-up also tilts farther downward thus paying out plenty of thread but not much morethan required for the passageof the shuttle through the loop. When the pitman link 10 and the take-up reach. the position shown in Fig. 4, the continued movement of the crank tyshifts the swinging link 7 and the pivoted lever 8 wardly, the said link causing the lever to 50 move swiftly on the crank or wrist pin 5, thus elevating the needle bar quickly and at vtime when it has no work to perform. The take-up, also acts during this movement to take up the slack in the thread.

ltwi'llbe understood that the take-up arm 25 which is attached to the pitman 10 in proximity to the jointed connection of the latterwith the needle-bar l3, follows the upor vertically reciprocating move ments of said needle-bar, and also follows the, tilting movements of the said pitm an so that the thread-guiding portion 26 of the said take-up arm will let off just enough thread required for the formation of a loop for the shuttle to pass through and in proper time so that there will be no surplus slack thread, and will quickly tighten the loop on the upward movement of the needlebar as the parts move from the position shown in Fig. 6 to the position shown in Fig. 3.

From the foregoing it will be seen that chine in proximity to the needle bar. These levers or links are of simple construction and do not require fine and accurate adjustmentin the assembling of the machine. There are no parts .toget out of order due to wearing action. The needle bar is'given a slow, steady and powerful movement during the passage of the needle through the goods and a quick movement during the withdrawal of the needle from the goods. The needle par-takesof a small dip in order to permit the formation of the loop through which the shuttle is to pass and the take-up is so connectedv to the needle bar mech-v anism that all extra parts are eliminated and the thread paid out or taken up at the proper times. The arrangement of the takeup also enables the machine to run backward without anybreaking of the thread, thus permitting the user of the sewing machine to anchor or fasten the thread after the seam has been finished.

lVhat I claim as my invention and desire to secure by Letters Patent is z" In a sewing machine, the combination with a rotating crank, of a lever'jointed at one end to said crank, a swinging link pivoted at one end to the machine head or frame and to the free endof whichswinging link the said lever is pivoted near its middle, a pitman jointed at its, upper end. to the end of said. lever farthest from the jointed connection of said lever with said crank, a needle-bar to. which the lower end of said pitman is jointed, and a take-up arm mounted at the lower part of said pitman in proximity tothejointed connection of the latter with said needle-bar so that said take-up arm follows the vertical reciprocating movements of the said needle-bar and the tilting movements of said pitman,

JOHN HEBERLING.

Witnesses:

HAROLD H. SIMMs, A A M. WHrrMonE.

this patent may be obtained for five cents each, by addressing the Commissioner oi Ifatents.

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