US487079A

US487079A - sohbade

Info

Publication number: US487079A
Authority: US
Publication date: 1892-11-29
Anticipated expiration: 1909-11-29

Description

(No Model.) 3 Sheets-Sheet 1.

G. SGHRADE. FEEDING MECHANISM FOR SEWING MACHINE-8..

Patented Nov. 29', 1892.

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(No Model.) v2', Sheets-Sheet 3. I G. SOHRADE. FEEDING MECHANISM FOR SEWING MACHINES.

.No. 487,079. Patented Nov. 29,1892.

Uenrnn STA ES I PATENT OFFI E.

GEORGE SOHRADE, OFNEW YORK, N. Y.

FEEDING MECHANISM FOR SEWlNG MACHINESr SPECIFICATION forming part of Letters Patent No. 487,079, dated November 29, 1892. Application filed May 8, 1891. Serial No.392,ll9. (No model.) Q 4 To all whom it may concern Be it known that I, GEORGE SCHRADE, a citizen of the United States, and a resident of the city, county, and State of New York, have invented a new and useful Improvement in Sewing-Machines, of which the following is a specification.

The object of this invention is to so arrange the mechanical movements of a sewing-machine that a high rate of speed and durability may be obtained.

The invention consists in the construction and combination of parts of the machine, as

will he hereinafter more particularly set forth, reference being had to the accompanying drawings, in which Figure l-"represents a side view of my improvedrmachine. Fig. 2 is a front end view of Fig. 1. Fig. 3 is a longitudinal sectional view of Fig. 1, showing the needle-bar, its guide, and means to operate it, and also the side view of the intermittent feed mechanism. Fig. 4 is a side view of the revolving feed-arbors and the connecting-gears. Fig. 5 is a side view of the internal feed-gear. Fig. 6 represents the side view of the star-wheel for operating the internal gear. Fig. 7 represents the star-wheel in position to move the internal gear. Fig. 8 is an end view of the needle-bar and a side view of the needle-bar eccentric. Fig. 9 is a cross-sectional view of the star-wheel. Fig. 10 is a cross-sectional view of the internal gear and feed-roll driving-gear. Fig. 11 represents a top view of the feed-arbor and its bearings, the intermediate gears, intermittent feed-gears, the automatic needle-stripper lever, and feed-arbor lifter. Fig. 12 is an end view of the feed-arbors, the side View of the top feed-arbor support, means to raise and lower the feed-roll and needle-stripper. Fig. 13 is the side view of the intermediate gear-support. Fig. 14 is a sectional view of the intermediate gears, gear-support, and means to secure the support. Fig. 15 shows the end view of the adjustable feed. Fig. 16 is a top view of Fig. 15. Fig. 17 shows the inclined slot to guide the adjustable feed, and Fig. 18 represents the end view of the gang-gear spline.

A in the several drawings represents the frame for supporting the various partscomposing the machine.

A is a cloth-plate for supporting the material to be sewed.

A is a revolving arbor driven by the grooved pulley A (shown in Fig. 1) and imparts motion to the several working parts of the machine.

A represents a spool of thread held in place by the thumb-screw A The thread receives the proper tension as it passes through the tension-disks A which are regulated by the thumb-nut A B, Figs. 1, 2, and 3, is a bracket secured to the frame A by screws 1) b, and supports the vertical needle-bar rod B, which is made tapering at its lower end, as shown at b, Fig. 3,that it mayalways find a firm central bearing, and is held in place by the set-nut B C, Figs. 1, 2, 3, and 8, is a vertically-reciprocating needle-bar forming an overhanging arm. By passing the material under the needie at the outer end of this arm with the edges closer to or farther away from the frame A of the machine the operator is enabled to sew at a greater or less distance from the edge of the material. The needle-bar O has a central passage through which the rod B passes, as shownat Fig. 3. This passage has a manifold purpose. It lightens the bar, thereby lessening the liability to wear, is easily and cheaply made, and forms a perfect wall forthe guide-rod B.

0 Figs. 3 and 8, is a stud forming'p'art of the needle-bar, to which the eccentric-rod C is secured.

G is the eccentric-rod strap surrounding the eccentric G which is driven by the arbor A The needle-bar G is guided vertically up and down on the rod B, while the sides 0 of the bar, bearing against the walls of slot C, as shown in Fig. 3, prevent a swinging or side motion.

0 is a needle-clamp nut by which the needle O is held in the clamp 0 v D and D in the several drawings represent arbors having the enlarged parts 11, as shown in Figs. 1, 2, and 4, between which the material to be sewed is intermittently fed forward. The arbor D, as shown in Fig. 4, is stationary, except as to its revolution, while the arbor D is supported at one end of a pivoted lever, as represented in Figs. 4,11, and 12,which permits of its being raised when it is desired to put in or remove the work.

D in Figs. land 11 is a gear by which the arbor D is driven by intermediate gears from the main arbor A D and D are gears of the same number of teeth and diameter, which makesthe arbor D and D turn in opposite directions or in wardly, causing the material to be sewed, to receive the same pressure and movement on both sides, thereby preventing any undue strain on one piece more than another, which is invariably the case in the well-known drop or wheel feed.

I in Figs. 4, 11, and 12 is a pivoted lever secured to the lug 1 Fig. 11, by aid of the screw 1 and forms a journal for the arbor D. This adjustable or swingingjournal is essential, as it allows the arbor D to be raised while the material to be sewed is placed be-, tween or removed from between the enlarged parts 01 of the arbors D and D.

The adjustment is also necessary to the feeding of the 1 bor D and is secured to the arbor D which is provided with the eccentric D, as shown in Figs. 1] and 12. Byturning the lever D the higher part of the eccentric D is forced against the top of the lover I, as shown in Fig. 12, moving it downward and separating the rolls D and D.

1 Figs. 11 and 12, isa lug for retaining the tension or pressure spring 1 in place.

1 is a screw for adjusting the spring 1 that more or less pressure may be given to the arbor D againstthe arbor D. The spring I also forms a yielding pressure, permitting various thicknesses of material to readily pass through between the enlargements d of the arbors D and D.

N, Fig. 2, is a stripper held to the frame A by the screw N and providedwith the recess N at its upper end; also, it has a right-angle flange N, through which the needle passes, and prevents the cloth from being raised or drawn up when the needle rises to permit the material to be fed forward.

I is a lever secured to the frame A at I and is provided with the screw 1 as shown in Figs. 11 and 12. This screw 1 passes through the slot 1 of the frame A, as representedin Figs. 2 and 11, entering the hole N of the stripper N, as shown in Fig. 2.

1 Figs. 11 and 12, is an arm secured to the lever I and comes in contact with the lower sides of the lever 1. raising its free end, and the screw 1 which, being connected with the stripper N, raises and lowers it simultaneously whenever the journaled arbor D is raised or lowered by the pivoted lever 1. Thus it will be seen that the stripper N and arbor D are both operated together at the discretion of the operator. Whenever it is desirable not to have the stripper operate with the arbor D, the screw I is turned in so it does not come in contact with the stripper.

E in the various drawings represents an internal gear, which is loosely mounted on the revolving arbor A as shown in Fig. 3, and has a fixed gear E secured to the internal gear-hub E H and H are intermediate gears secured to each other and running loosely on the stationary arbor H as shown in Figs. 11 and 14. These gears H and H are intermittently moved by the gear E and operate the arbor D through the medium of the gear D as represented in Fig. 11.

H Figs. 11, 13, and H, is an adjustable block having arbor H and tenon H which is made to adjustin the mortise H of the frame A. (Shown in sections in Fig. 14.) The block H is made adjustable in the mortise H that various sizes of the intermediate gears H and H may be used to increase or lessen the speed of the arbor D.

F, Figs. 3, 6, 7, and 9, represents a star-wheel having teeth F and pivot-slot F as shown in side view, Figs. 6 and 7. g

G, Figs. 3, 6, 7, and 9, is an eccentric secured to the driving-arbor A and eccentrically operating the pivoted star wheel F within the internal gear E. p

F is a pivot-support secured to the frame A by screw F and having a pivot F which enters the slot F as shown in Figs. 3, 6, and 7. This pivot or post prevents the star-Wheel F from being carried around with theeccentrio and is the direct means of producing the intermittent action of the internal gear E, as shown in Fig. 7. V I

The eccentric G, as shown in Fig. 7', is represented as swinging the top of thest-ar-wheel over in the direction of the arrow, and as its teeth meshintothoseof the uppcrpartoftheinternal gear the highest part of the eccentric G is opposite the slot F at which time the teeth of the star-wheel move substantiallyin a vertical or downward line, which action is caused by the pivot F holding the star-wheel, when the internal gear ceases to move a sufficient time to allow the needle to descend and be drawn out of the material. Should all. the teeth of the star-wheel be removed and a lever formed, as represented by the dotted lines 0 in Fig. 7, the same result would be obtained, as the end 0 of the lever by the action of the eccentric G and pivot F is moved at the top of the star-wheel in the form of an ellipse. When it advances upward, it engages a tooth of the internal gear E, moves it forward, withdraws, and, returning, engages the next tooth; but the star-wheel F is preferable, as its teeth never leave those of the internal gear E, which avoids all liability of a blow or noise, the several points of contact making it more durable and positive. I

To avoid the inconvenience of removing the intermediate gears that a longeror shorter stitch may be made and the action of the arbors D and Dbe varied,I show a modification in Figs. 15, 16, and 17, which permits a ready change. On the flange of the internal gear E a Worm-thread is formed, as at V, Fig. 16, this worm engaging with the gears, mounted on the shaft K, drives the arbor D through the bevel-gears J 5 and D the same as the intermediate gears H and H. The arbor K has a spline-groove K, in which the spline J 2 fits. The spline prevents the gang-

gears

1,2, 3, 4, 5, and 6 from turning, but allows a free longitudinal adjustment that any desired gear of the gang may be readily engaged with the worm V. This I accomplish by adjusting the spline-head J at various points in the slot J 4 of the frame A, as shown in Fig. 17, and securing it in place. The strap J forms a journal for arbors D and k and permits the elevation of the arbor K that different gears in the gang may be set over the worm V. Then a longer or shorter stitch is required, the spline-head J is set at any of the scales indicated by the figures 1, 2, 3, 4:, 5, and 6, which gives the exact length of the stitch desired.

I do not limit this feed mechanism to chainstitch machines, but will adapt it to shuttle machines as well.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a sewing-machine, the combination, with a rotary arbor, of an internal gear-wheel mounted loosely thereon and adapted to be intermittingly operated, mechanism for operatively connecting the arbor and the wheel, and a feeding device connected with and adapted to be operated by said gear-wheel, substantially as set forth.

2. In a sewing-machine, the combination of an arbor provided with a fixed eccentric, an internal gear mounted loosely on said arbor, an intermittent actuating device on the eccentric adapted to engage with the internal gear, a stop for engaging with the actuating device to prevent its rotation with the eccentric, and a feeding device connected with and adapted to be intermittingly operated by said internal gear, substantially as set forth.

3. In a sewing-machine,the combination of an arbor provided with an eccentric, an internal gear-wheel loosely mounted on said arbor, a star-wheel on the eccentric engaging with the internal gear, a stationary stud engaging the said star-wheel, and feeding mechanism connected with and adapted to be intermittingly operated by said internal gearwheel, substantially as set forth.

at. In a sewing-machine provided with an iutermittingly-movable gear-wheel, the combination, with the feed-rolls, the shaft of one of which is provided with a gear-wheel, of a block adj ustably secured to the frame of the machine, interchangeable gear-wheels mounted on the block and adapted to engage with the intermittingly-movable gear-wheel and with the gear-wheel of one of the feed-rolls, substantially as set forth.

5. In a sewing-machine, the frame of which is provided with a mortise, the combination, with the feed-rolls, the shaft of one of which is provided with a gear-wheel, of an intermittingly-movable gear-wheel, a block provided with a tenon adj ustably secured in said mortise, and interchangeable gearwheels mounted on said block and adapted to engage with the intermittingly-movable gearwheel and with the gear-wheel of the shaft of one of the feed-rolls, substantially as set forth.

6. In a sewing-machine, the combination, with a lever pivotally secured to theframe, of an intermittingly-operated feed-roll journaled in one end of the lever, a supplemental feedroll, an adjustable pressure-regulator connected with the said journal, and a cam engaging with the other end of the lever, substantially as set forth.

7. In a sewing-machine, the combination, with the upper and lower feed-rolls, one of which is movable toward and from the other one, of a needle-stripperand mechanism en gaging with the needle-stripper and with the movable feed-roll, whereby the needle-stripper is raised simultaneously with the separation of the rolls, substantially as set forth.

8. In a sewing-machine, the combination, with the feed-rolls, of a lover, a needle-stripper detachably connected therewith, a second lever engaging with the shaft of one of the feed-rolls, and means for detachably connecting said lever, substantially as set forth.

9. In a sewing-machine, the combination, with the lever pivotally secured to the frame and having a laterally-projecting arm near one end, of feed-rollers, the shaft of one of which is journaled in the end of said lever, means for operating the lever, a second lever pivotally secured to the frame and adapted to be engaged by said arm, and a needle-stripper detachably secured to said second lever, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this th day of April, 1891.

GEORGE SOHRADE.

Witnesses:

E. T. THOMAS, C. O. THOMAS.