US433946A - Sewing-machine - Google Patents

Description

(No Model.) '3 SheetsSheet 1.

H. LEFEBBR.

SEWING MACHINE.

No. 433,946. Patented Aug. 12,1890.

C['7l IHSSES:Om VVEIIgENTOR:

ATTORNEYS.

(No Model.) 3 Sheets-Sheet 2. H. LEFEB ER.

; SEWING MACHINE.

N0. 4 33,946. Patented Aug. 12, 1890.

INVENTOR ATTORNEYS.

'(No Model.) 3 Sheets-Sheet 3.

HQLEFEBER. SEWING MACHINE.

No. 433,946. Patented Aug. 12, 18 90.

aga -Z L BY WITNESSES: INVENTOR ATTORNEYS.

*1 UNITED STATES PATENT OFFICE.

HENRY LEFEBER, or PHILADELPHIA, PENNSYLVANIA.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 433,946, dated August 12, 1890.

Application filedlliay 26, 1888. Serial No.275,173. (no model.)

To all whom it may concern.-

Be it known that I, HENRY LEFEBER, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Sewing- Machines, of which the following is a full, clear, and exact description.

. The object of the invention is to provide a new and improved sewing-machine which is very simple and durable in construction and effective in operation.

The invention eonsistsin certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification,

in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional side elevation of the improvement, parts being in elevation. Fig. 2 is a front elevation of the same. Fig. 3 is a sectional plan view of the shuttle on the line a: a: of Fig. 2. Fig. 4 is a sectional plan view of the shuttle on the line 1 y of Fig. 2. Fig. 5' is a bottom view of the shuttle. Fig. 6 is a plan view of the shuttle-support. Fig. 7 is an under plan View of the operating mechanism. Fig. 8 is a plan view of the front part of the machine, showing the peculiar construction of the take-up; and Fig. 9 is a plan view of the bed-plate and the feed-dog.

The improved sewing-machine is provided with the usual bed-plate A, on which is secured the L-shaped arm B, carrying on the outer end of its horizontal arinthe head 0, in which is held to reciprocate Vertically the needle-bar D, carrying the needle D, and in the said head is also held to slide vertically the presser-bar E, carrying at its lower end a presser-footE, said presser-bar E being raised and lowered by any suitable means, such as is illustrated in Fig. 1, which represents a bell-crank lever E acting on a pin projecting from the presser-bar E.

In the horizontal part of the L-shaped arm B is mounted to rotate the main shaft F, carrying on one outer end the usual pulley F connected by a belt or other means with the sewing-machine treadle in order to imparta rotary motion to the said main shaft F. Next to the pulley F is placed the usual flywheel F On the main shaftF is seeuredabevel gearwheel G, which meshes into the bevel gearwheel G secured to the upper end of a verpin J, secured on the bottom of the crankdisk J, fastened on the vertical short shaft K, on which is held to slide and turn a collar L, having its bearing in a U-shaped bracket N, secured by its ends to the under side of the bed-plate, as shown in Figs. 2 and 7. The collar L is held in its uppermost position by an arm 0, engaging with its forked end an annular recess formed in the said eollar L, said arm 0 being secured to an arm 0, pivoted at O on the bracket N, and provided on its other end with a pin 0 adapt-ed to engage an aperture formed in the said bracket N, so that the arm 0 is held in place until the pin 0 is drawn out of the said aperture. When this is done, the operator is enabled to move the arms 0 and O downward, whereby the collar L is moved'in a similar manner for the purpose of disconnecting the collar from the shuttle P.

The shuttle P is provided with a cylindrical casin P havin in its bottom an oblon recess P in which fits a similarly-shaped lug L, formed on the upper end of the collar L, which thus supports the lower end of the shuttle P. The upper end of the shuttleis guided by a semicircular pin Q, secured by its upper end to the under side of the plate A,fastened to the bed-plate A. On the lower end of the said pin Q is formed a concentric collar Q, fitting into aeorresponding groove R, formed in the upper end of the cover-plate R, closing the upper end of the shuttle-casing P, and provided with an inwardly-extending hollow shank R screwing on the upper end of a hollow shank or pin P secured centrally to the inside of the casing P. On the shanks R and P is held the spool S, from which the thread passes out through an aperture R formed in the cover-plate R and covered by the usual slotted plate R pivoted on the top of the said cover R. The inclined slot R in the said plate R corresponds with the opening R. i

On the outside of the casing P of the shuttle P is secured the spiral band T, extending from the bottom of the shuttle to the upper edge through one quarter turn and being slightly inclined at one edge, so as to form a groove T. (Plainly shown in Fig. 4.) The upper end of the spiral band T continues into the hook T extending inward toward the center of the cover-plate R, as shown in Fig. 3. The needle-thread U is unwound in the usual manner from the spool U held to revolve on a suitable pin secured to the arm B. The needle-thread U is then passed over the headC and through a tension device V of any approved construction, and located on the front of the face-plate O. The thread then passes upward and through an eye W, formed in the outer end of the take-up lever W, fulcrumed at W to a bracket 0, secured to the inside of the head 0. 0n the take-up lever W is formed an inwardly-projecting frictionroller W extending into the cam-groove X, formed on the cam X, secured to the main driving-shaft F; The latter, in the usual manner, imparts by suitable means an upand-down movement to the needle-bar D.

In the plate A, to which the semicircular pin or rod Q is secured, is formed a slot, in which operates the feed-dog Y of any approved construction and connected with suit-' able mechanism for imparting-the usual motion to the said feed-dog. The needle D passes through the said aperture in the plate A, and through a semicircular groove formed in the pin Q, and also through a central aperture in the collar Q, formed on the lower end of the said rod Q. The shanks R and P are made hollow, so that the needle can pass into the same in its downward movement. Next to theplate A is placed a lid A hinged to the bed-plate A, and adapted to be thrown upward, so as to conveniently get at the shuttle P, as shown in Figs. 1, 8, and 9. The bed-plate A is recessed under the plates A and A as shown.

The operation is as follows: The main shaft F is rotated in the nsualmanner and imparts a vertical'reciprocating motion to the needlebar D, and by the cam X said shaftF imparts an up-and-down swinging motion to the takeup lever W. The cam X is so arranged that when the take-up lever WV moves upward the needle-bar D slides downward, and vice versa. The rotary motion of the main shaft F imparts a like motion to the vertical shaft G2 by means of the bevel gear-wheels G and G, and the rotary motion of the shaft G2 is imparted to the short shaft K and its collar L by means of the pitman H, connecting the disks G and J with each other. The link I serves to carry the pitman H over the deadcenters of the disks J and G The rotary motion imparted to the collar L is transmitted to the shuttle P by the lug L, engaging the corresponding recess P on the under side of the casing P. Every revolution of the main shaft F imparts an up-and-down motion to the needle-bar D, and the take-up lever W, i

and one revolution to the shut-tle P.

The cloth to be sewed is passed over the plate A and the feed-dog Y feeds it forward in the usual manner. When the needle descends, it passes through the cloth, and one end of the thread Uis held in the latter, and the needle in its downward movement carries the thread with it into the hollow shanks R and P and when the needle ascends a short distance a loop of the thread U is formed be tween the bottom of the plate A and the top of the cover R, as shown in Fig. 1.. The hook T is now in position, so as to take hold of this loop, and as the casing P turns around the thread passes over the said hook T into the groove T, formed by the spiral T, and is carried downward. The thread reaches the lower end of the spiral T when the casing has made one quarter-revolution, and then during the other quarter-revolution the thread is held, and as soon as one half-revolution of the casing P has been made the thread slips off and forms,in conjunction with the thread from the spool S, a stitch on the cloth as the needle D is now moved upward. It will be understood that when the thread slips ofi after one half-revolution of the casing P it is pulled upward by the take-up lever W, so that the thread is pulled out on the under side of the cloth in order to formv the usual stitch. It is understood that the pin or post Q is stationary, and in order to bring the point of the hook T as close to the needle D as possible I provide said pin or post Q with a semicircular groove Q ,through which passes the point of the said hook T during a halfrevolution. The thread from the spool S passes out through the aperture R and passes through the loop formed by the needle-thread U at every revolution of the shuttle P.'

If the operator desires to remove the shuttle P for inserting a new spool S, or for other purposes, he throws the plate A upward, removes the pin 0 and presses the arm 0 downward, so that the arm 0, connected with the said arm 0', moves the collar L downward on the shaft K until its lug L disen gages the recess P on the under side of the casing P. The operator then takes hold of the shuttle P and can easily remove the same from its bearings. The cover R is then un screwed and a new spool is inserted into the casing P and supported'on the shank P Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. In a sewing-machine, a shuttle compris I ing a casing having an open upper end and IIO needle-aperature, a concentric groove or recess in its upper face, a central hollow shank on its lower face threaded to engage the spoolpost, and a thread-aperture to one side of the needle-aperture, and a plate on the cover having a slot registering with said thread-aperture, substantially as set forth.

2. In a sewing-machine, a needle-bar, a needleheld on the said needle-bar, and a takeup lever, in combination with a rotary shuttle provided with a spiralband terminating at or near the central line at the top in a loop taking hook, substantially as shown and described.

3. In a sewing-machine, the combination, with a bedplate, the needle, and an operating mechanism, of a post held on the under side of the said bed-plate and having a semicircular groove for the needle to pass through, an apertured ring formed on the lower end of said post, a casing mounted to rotate and placed axially in line with the said apertured ring, a cover held removably on the said casing and provided with a central aperture for the passage of the needle, said cover being also provided with a central recess into which fits said ring, and a hook extendinginwardly over said cover, substantially as shown and described.

4. In a sewing-machine, the combination, with a bed-plate, the needle, and an operating mechanism, of a post held on the under side of the said bed-plate and having a semicircular groove for the needle to pass through,

an apertured ring formed on the lower end of the said post, a casing mounted to rotate and placed axially in line with the said apertured ring, a cover held removably on the said casing and provided with a central aperture for the passage of the needle, said cover being provided with acentral recess into which fits said ring, and a spiral band held on the out side of the said casing and extending through one quarter of the circumference of the said casing, and a hook formed on the upper end of the said spiral band and extending to within a short distance of the said post, substantially as shown and described.

5- In a sewing-machine, the combination, 5 5

with a bed-plate, the needle, and an operating mechanism, of the bracket N, secured on the said bed-plate, a post Q, provided with the apertured ring Q, and secured on the said bed-plate, the shuttle P, having its bearing at its upper end on the said ring Q and provided in its bottom with a recess P the collar L, having its bearing in the said bracket N and provided with a lug L, fitting into the said recess P and the shaft K, having a rotary'motion and on which said collar is held to slide and to rotate, substantially as shown and described. k

6. In a sewing-machine, the combination, with a bed-plate and the bracket N, secured on the said bed-plate, of a post Q, provided With the apertured ring Q and secured on the said bed-plate, the shuttle P, having its bearing at its upper end on the said ring Q and provided in its bottom with a recess P, the collar L, having its bearing in the said bracket and provided with the lug L, fitting into the said recess P and the shaft K, having a rotary motion, and on which the said collar is held to slide and to rotate, the arm 0', fulcrumed on said bracket N and provided with a pin 0 for holding the said arm 0 in position, and the arm (9, projecting from the said arm 0 and engaging an annular recess in the said collar L, substantially as shown and described.

7. In a sewing-machine, the combination, with the main shaft F, of the vertical shaft 7 G rotated from the said main shaft F and carrying the crank-disk G the pitman H, pivoted at one end to the said crank-disk, the link I, pivotally connected with the said pitman H, the crank-disk J, )ivotally connected with the other end of the said pitman H, the

Witnesses:

Trrno. G. Hosrnm O. SEDGWIOK.

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