US964852A - Lock-stitch sewing-machine. - Google Patents

Description

- H. H. CUMMINGS.

LOCK STITCH SEWING MACHINE. APPLICATION FILED SEPT. 25, 1903.

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Patented July 19,1910.

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HENRY H. CUMMINGS, 0F MALDEN, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN MENTS, TO UNION LOCK STITCH COMPANY, OF BOSTON, MASSACHUSETTS, A COR- PORATION 0F MAINE.

' LOCK-STITCH SEWING-MACHINE.

Specification of Letters Patent.

Patented July 19, 1910.

To all whom it may concern:

Be it known that I, HENRY H. CUMMINGS, a citizen of the United States, residing at Malden, in the county of Middlesex, State of Massachusetts, have invented a certain new and useful Improvement in Lockstitch Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

Figure l of the drawings is a View showing in front elevation portion of a sewing machine having an embodiment of the invention applied thereto, a part of the fixed casing of the machine being represented in vertical section. Fig. 2 is a view of the same'parts looking'from the left hand side in Fig. 1,- showing a part of the said casing in vertical transverse section. Fig. 3 is' a' View in plan of portion of the saine, with the work support omitted.

Having reference to the drawings,-a part of the base of the fixedcasing of the sewing machine is shown at 1, and at 2 is shown a post or standard which is secured upon thesaid base and extending upward therefrom. 3 is a work-rest or work-support upon the upper end of the said post or standard 2. 4 is an ordinary hooked needle, and 4-1 the needle-bar carrying the same. The said needlebar is held in guides 42, 42, and actuated through suitable connections, which latter herein are constituted by the link 43, the crank-pin 44, the disk 45 carrying the said crank-pin, and the shaft 46 on which the said disk is mounted. At- 5 is shown a rotary loop-taker, herein a shuttle, containin a bobbin as usual. At 7 is the shuttle-driver by means of which the said shuttle is rotated. The said shuttle-driver is fixed upon the upper end of the upright shaft 71, which latter is driven by means of the bevel pinion 7 2 upon its lower end meshing with the bevel gear 73 fast upon the horizontal rotating shaft 46. As thus far referred to, the various parts are or may be as heretofore or as preferred, save as I will hereinafter indicate in treating of the features in which my invention more especially resides.

In conformity with one portion of my invention, I provide a finger, which is movabl mounted adjacent to the path of the needle and that of the nose of the loop-taker or shuttle, and is provided with actuating connections whereby, as the needle draws a loop of needle-thread through the 'work, the said finger is caused to move synchronously with the needle but at a different rate of speed and to operate, while the drawing movement of the needle continues, to take the loop out from under the hook of the needle by a movement in the same direction with that of the needle but faster than the latter, thereby disengaging the 100 from the moving needle. The finger hol s the loop while the needle completes its movement away from the work, and also serves as a restrainer by means of which one side of the loop is held against the tendency of the rotatmg loop-taker or shuttle to carry the loop around with it in its rotation. The said finger, in other words, operates to disengage the loop from the needle while the latter is continuing its withdrawing movement, and also as a loop-restrainer to prevent one sideof the loop from being carried around within the shuttle-race by the shuttle in its rotation. Herein, the finger in question is shown at 8.

The means of supporting and actuating the finger may vary in practice. Herein, it is mounted upon a rod 9 that is mounted to turn in a bearing or bearings with which the post or standard 2 is provided. For the purpose of communicating-movement to the rod and finger, the said rod 9 is shown provided, at the end thereof opposite that to which the finger is applied, with a crankarm 91, which latter is connected by means of a rod 92 with an arm or lever 93, the said arm or lever being mounted pivotally upon a screw 94 which is applied to the base 1, and being provided with a roll 95 against which acts a cam 96 which is fast u on the rotating shaft 46. By means of t c said cam and arm or lever, and the connections from the last mentioned part to the rod 9 upon which the finger 8 is mounted, the said finger is oscillated in a vertical plane. The cam is shaped and proportioned to cause the finger to operate as aforesaid. The free end of the finger is pointed, so as to facilitate the entrance of the said end between the opposite sides of the loop which is being drawn down by the needle. The finger is slotted as at 81 to receive the upper end of the needle as the finger swings downward. The pointed end of the finger enters the loop above the end of the needle, and the downward swing of the finger is so speeded as to cane the operative end or the same to g ainiipon-- the needle as the latter descends. he finger in being depressed acts by reason of the said gain to disengage the loop from Which. it has disengaged from the needle,

under the hook of the needle, and-then operates to carry the loop laterally away from the said hook in consequence of the di- Verg'ence of the curved path of the working end of the finger from the path of move ment of the needle. The finger remains in its depressed position, holding the loop,

while the needle continues is descent.- Meantime, the tip of the loop-taker or shutthe enters the loop. "-The finger operates to restrain one side of the loop so as to pre- -vent the entire loop from being carried around within the shuttle-race by the shuttle in its rotation.

One portion of my invention consists in an improved construction of the shuttle-raoe whichiacilitates the operation of inserting and removing a shuttle. The shuttle-race is composed of thin plates 10, 10, andlOl, oc-

'cupying a horizontal position and shaped to for the purpose of facilitating the removal.

of the said plate. j

As will be apparent from the drawings and foregoing description, the needle and loop-taker or shuttle are both located at the same side of 'the material which is to be stitched, and, also, the loop-taker onshuttle rotates ip a plane at right angles to the plane containing the path' of movement of the --needle. The body of the shuttle, and they shuttle-race, are located at' a slight distance laterally from the line of movement ofthe needle and needle-bar. In order that the loop of thread which is drawn by the needle may become properly engaged by the shuttle Without requiring the aid of a moving device to engage the side of the needle-loop and carry it over to the loop-taker orshuttie, the latter is provided with a tip or looptaking point 52 which projects radially beyond other portions of the shuttle body and or" the shuttle-race, so as to nearly or substantially intersect the path of movement of the needle. The said tip or point constitutes, in effect, a projecting picking device, forming part of the loop-taker or shuttle,

taking the place of the-separate movable loop-opener which in otherconstrnctions. of

" within the sewing machiiies is employed for. the ur-" pose of presenting one side of the needle 0o path of movement of the usua shuttle-tip,

I claim as my invention 1. In a sewing machine, in combination, a hooked needle operating to draw a 100 of needle-thread through the material whic is to be stitched, a loop-taker, a finger, and operating means for the said finger acting to cause it to disengage the said loop from the moving needle by movement communicated to the said 100 .in the same general direction ith that oi the needle but faster than the lattenand to hold one side of the loop against the tendency of. the loop-taker to carry the loop therewith. T

2. In a sewing machine, in combination, a hooked needle operating to draw a 100 of needle-thread, a shuttle-race, a shutt e, a finger, and operating means for the said finger actingto cause it to disengage the loop from the needle by movement com; municated to 'the said loop in the same general direction with that of the needle but faster than that of the needle, and to hold' one side of the loop against the tendency of the shutt e to carry the loop into theshuttlerace. "X

3. In a sewing machine, in combination, a hooked needle, a loop-taker, a finger moving in proximity to the paths of the needle and of the tip of the loop-taker, having a pointed free end to enter the needle-loo and slotted for the passa e of thenee e therethrough, and means or operating the said finger to cause.it to enter the needleloop and disengage the said loop from the needle by movement communicated to the loop in the same general direction with that of the needle, but faster than that of the needle.

4. The combination with the hooked needle and reciprocating needle-bar, of the rotating shuttle operating at the same side of the work as the needlebar and needle,

the said shuttle rotating in a plane at an angle to that of the line of movement of the needle, and having a loop picking point projecting radially beyond other portions of the shuttle and moving in a path intersect-- ing or substantially so the path of move- .ment of the'needle, the said point entering the unopenedneedle-loop and opening the same for its own complete entrance into such 5 The combination with the hooked needle and reciprocating needle-bar, of the loop-taker operating at the same side of the work as the said needle-bar and needle. and also rotating in a transverse plane at an'angle to that of the line of movement of .rthenneedle, and provided -...vitlr a radiallyprojeeting lobp=picking point which moves in a path intersecting pr substantially so the path of movement of the needle and enters the unopened needle-loop, opening the same for its own complete entrance into such loop,

in the said groove and having the laterally movable section at the side opposite the needle-bar and needle whereby the insertion and removal of the shuttle are permitted.

7. The combination with the upright post or standard,'the needle and needle-barworking at one side thereof, and the shuttle driver rotating on ,a vertical axis, of the shuttle, and the horizontal shuttle-race hav-' ing fixed oppositeside portions and the removable intermediate portion at the side opposite the needle-bar and needle and fitted to the said side portions. a

8. The combinationv with the hooked needle and the reciprocating .needlebar," of the loop-taker operating at the same side of thework as the needle-bar and needle,

rotating in aplane at an angle to that of the line of movement of the needle-bar and needle, and provided witha loop-picking rojects radially beyond other i point-which portions of t e loop-taker and moves in a path intersecting or substantially so the path 'of movement of the needle, the said point entering the unopened needle-loop and opening the same for its own complete en trance into such loop, and means for producing a plurality of rotations of the said loop-taker to each reciprocation of/t-he needle-bar and needle, the needle occupying a retracted osition clear Ofthe path of movement 0 the said loop-taking point at the time of the intermediate revolution of the loop taker. V

v In testimony whereof I afiix my s gnature in presence of two Witnesses.

HENRY H. CUMMINGS;

\Vitnesses:-

CHAs. F. RANDALL, ,WILJLIAM A. COPELAND.

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