US285359A - Sewing-machine - Google Patents

Description

(No Model.)

S. 4Y. LOV`E. SEWING MAGHINE. No. 285,359. Patenwd sept. 18, 188s.

UNITED Srnrns Armar @Finca SAMUEL Y. LOVE, OF PITTSBURG, PENNSYLVANIA.

SEWING-MACHINE.

SPECIFICATION forming -part of Letters Patent No. 285,359, dated September 18, 1883. Application filed April 23, 198:?. (No model.)

.To @ZZ whom it may concern,.-

Be it known that I, SAMUEL Y. Lovn, a citizen of the United States, residing at Pittsburg, county of Allegheny, State of Pennsylvania, have invented or discovered a new and useful Improvement in Sewing-Machines; and I do hereby declare'the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which like letters indicating like partsv Figure l isa transverse vertical sectional view of the head of a sewing-machine bracket illustrative of my invention, the plane of section being indicated by the line y y, Fig. 2. Fig. 2 shows a longitudinal vertical section taken in the plane of the line x x, Fig. 1. Fig. 3 is a horizontal sectional view taken in the plane -of the driving-shaft, the driving-gear and mechanism immediately connected therewith being in plan or top elevation; and Fig. 4 is a top plan view df a portion of the head, needle-bar, and its vertically-actuating bar.

1 My invention relates to certain improvements in mechanism for changing the plane of needle movement in sewing-machines for button-hole stitching or ornamental sewing; and in general terms it consists of certain combinations of a vertically and horizontally movable needle-bar, a vertically-movable plateor bar carrying the needle-bar, an intermittently-rotary wrist working in a groove in the needle-bar for giving it horizontal movement, and gear mechanism for operating the wrist at intervals while the needle is raised, as hereinafter more fully described and claimed.

In the drawings, A represents a portion of the bracket-arm and head of a sewing-machine frame, and A the cap or face plate, which is secured to the face of the head by screws a in the usual manner, as illustrated in Fig. 2.

A needle-bar, B, by preference of rectangular form in cross-section, is employed, which is passed through openings b in the top and bottom plates of the cap. These openings are of greater width than the bar in the direction of the driving-shaft D, whereby freedom of movement is provided for the needle-bar in such openings, not only in vertical direction, but also horizontally, at right angles to the direction of feed.

The needle-bar is carried in its vertical movement by a vertically-reciprocating plate or bar,

C, which passes through similarly -shaped guide-openings, b', vadjoining the openings b.

VVertical movement is given to this bar C by the usual cam-block, C', affixed thereto, in the groove c of which a wrist-pin, c', works, which latter is carried in the usual manner on the end of the driving-shaft.

The plate-bar G and needle-bar B are connected, so as to take vertical movement in unison, by means of pins c2, set fast in the platebar, and, extending horizontally from its face, pass loosely through holes b2 in the needle-bar, thereby causing the needle-bar to move vertically with the bar C, but affording it freedom of horizontal movement, sliding back and forth on the guide-pins c2. This horizontal movement is given to the needle-bar independently of the bar C by means of au intermittentlyrotary wrist, e, carried on the end disk, e', of shaft E. This wrist works in a groove, b3, out

in the side face of the needle-bar, the groove being extended vertically to prevent contactk at its ends with the wrist at any part of its full stroke. Consequently the wrist will be effective only in giving horizontal movement.

The shaft E is journaled in any suitable bearing, as at a', and the wrist e is set'out of its axial line a distance equal to one-half the horizontal movement to be given the needlebar, and its normal position ofrest between successive movements or part rotations is in ahorizontal plane through the axis of the shaft, whereby one half-rotation of the wrist shifts the needle-bar to one side of its groove or opening b, and the succeeding half-rotation shifts it back or to the other side of the opening. In order to impart these movements intermittently while the needle is raised, a gear-wheel, F, is secured on the shaft E, which is driven at intervals by a mutilated crown-gear, H,which makes power-connection with driving-shaft D by a feather sliding in the groove h. The number of teeth on this crown-wheelis one-half the number on the wheel F, so that one full rotation of the crown-wheel will give a halfrotation to F, effecting one horizontal movement, as above described, and the succeeding rotation of the crown-wheel will effect the reverse horizontal movement. Thus successive IOC) rotations of the driving-shaft and crown-wheel will shift the needle-bar horizontally back and iQrth, first in one direction, then in the other,

, be given while it is raised and the needleis out of the cloth. In order to effect this movement quickly, or before the needle re-enters the cloth, the crown-wheel is made of considerably greater size or diameter than the wheel F, so that the toothed part of its periphery or crown shall be considerably less than a halfcircumference. This relationship between the wheels may be varied considerably, however, depending` somewhat upon the class of work to be done by the machine, and therefore I do not wish to limit my invention to any partic- .ular relative sizes of gears, the principal ob*- ject being to effect the horizontal shift of the needle-bar while it is raised, so as to free the needle from the fabric and permit of direct vertical movement of the needle while in the fabric; also, if desired, bevel-gears may be substituted for the spur and crown wheels F H, or other suitable or well-known form of gearing may be employed, whereby one complete rotation of the driving-shaft imparts intermittent rotary motion to the shaft E.

Then desired to do straight sewing. the needle-bar may be moved to one side of its guideopenings b, and the wheels F H be put out of gear. To this end screws s, having cam-shaped or one-sided heads, are set in tapped holes in the ends of the bar C, so that by -turning the screws their one-sided heads will press the needle-bar over to the front side of the guideopenings b, and hold it there while the two bars take vertical 1n ovement in unison; also, to move the crown-wheel out of gear, a groove, h', is made in the surface of its extended hub, which receives the forked ends 1' of a lever, R, such lever being pivoted, as at i", to a stud, r2, on the inner face of the head or shell A. The lower end of the lever protrudes through a notched slot in the shell, as at @which notches are in position to take the lever and hold it when either Iin or out of gear. If desired, the lever may have spring action sufficient to carry it into the notches; or a light spring may be arranged to bear upon the face of the lever for this purpose.

If desired, other suitable or well -known methods of shifting driving mechanism into and out of gear may be substituted for the lever B, and other similar modifications may be made in the details of construction without departing from my invention.

I claim herein as my invention- 1. In a sewing-machine, the combination of vertically-reciprocating bar C, vertically and horizontally reciprocating bar B, and hollow inclosing-head having guide-openings b b in its ends, the opening b being extended beyond the thickness of bar B in the direction of its horizontal movement, and guide-pins c2, secured to bar C, and extending horizontally through bar B, substantially as and for the pur poses set forth.

2. The combination of vertically-reciprocating bar C, guide-pins c2, needle-bar B, carried by and horizontally movable on the pins, such needle -bar having an extended groove, b3, therein, and an intermittently-rotary wrist working in the groove for giving the needlebar its horizontal movement, substantially as set forth.

3. The combination of vertically-reciprocating bar C, guide-pins', grooved needle-bar B, shaftE, and driving-gearsF H, the gear H having teeth on a part only of its circumference, the number being one-half that on wheel F, substantially as and for the purposes set forth.

4. The combination of driving-shaft D, mutilated gear H, gear F, shaft E, grooved needle-bar B, guide-pins c2, bar C, cam C, and wrist c', substantially as set forth.

5. The combination of grooved needle-bar B, rotary shaft E, carrying wrist e, and driving gears F H, the gear H being the larger of the two, and having teeth on a part only of its periphery or circumference, substantially as set forth. n

6. rIhe combination of bar C, needle-bar B, guidepins c2, and screws s, substantially as and for the purposes set forth.

7. The combination of grooved needle-bar B, shaft E, carrying wrist e, gear-wheels F H, and mechanism, substantially as described, for putting such wheels into and out of gear with each other.

In testimony whereof I have hereunto set my hand.

Witnessesr. SAMUEL Y. LOVF R. H. WHrrrLnsnY, C'. L. PARKER.

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