US408019A - Sewing-machine - Google Patents

Description

(No Model.)

A. LESLIE. SEWING MACHINE.

Patented July ,30, 1889.

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ARTHUR M. LESLIE, OF CHICAGO, ILLINOIS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 408,019, dated July 30, 1889.

Application filed November 14, 1887. Serial No. 255,153. (No model.)

To aZZ whom it may concern.-

Be it known that I, ARTHUR M. LESLIE, a citizen of the United States, and a resident of Chicago, in the State of Illinois, have invented a new and useful Improvement in Rotary- Shuttle Sewing-Machines, of which the following is a specification.

The general object of this invention is to increase the adaptation of such machines to work noisclessly and with as little friction as possible at the high speeds which their conti nu ous rotary motion renders otherwise p racticable.

The invention consists, first, in a peculiarly -constructed shuttledriver, which is adapted to be noiselessly adjusted automatically or otherwise; secondly,in novel means for adjusting the same automatically in a positive manner to open a loopreleasing Space behind the heel of the shuttle at the proper moments and to gradually reclose-the same; thirdly, in peculiar guards to prevent the thread from being drawn into the shuttlerace, and, fourthly, in means whereby the cap of the shuttle-race is adapted to yield in case particles of thread or lint should get into the race, so that the machine shall notbe stopped or caused to run hard by such an accident.

A sheet of drawings accompanies this specification as part thereof.

Figures 1 and 2 of the drawings represent face views of the shuttle-race with the shuttle proper in place, showing the shuttledriver in two positions. Fig. 3 represents a face view of a fixed cam behind the shuttlerace and a vertical section in the plane of its face. Fig. L represents a horizontal section on the lines 00 50, Figs. 2 and 3. Figs. 5 and 6 represent top views of the shuttle-race guards and the shuttle with the latter in different angular positions. Fig. 7 represents a back view of the shuttle and guards as seen in Fig. 6. Fig.8 represents an edge view of said guards as seen in Fig. 2, with the shuttle in section on the line marked y; and Fig. 0 represents a fragmentary vertical section on the line 2, Fig. 1.

Like letters of reference indicate corre sponding parts in the several figures.

Below the cloth-plate C the under shaft S carries at one end a shuttle-driver disk D,

Figs. 1 to 4, inclusive, and the bed-plate is provided with a depending projection, which forms ,a circular shuttle-race R, concentric or nearly concentric with said shuttle-driver. lVithin said shuttle-race a disk-shuttle s rotates, and the under thread within the same is carried by a suitable bobbin (not shown) inclosed by a non-rotary bobbin-case (not shown) having a tension-arm, which engages with a pair of stop projcctionsuaFigs.1 and 2, on the shuttle-race cap 0 at top to keep the bobbin-case from turning. Said disk -D carries on its face a driver (I, of peculiar shape, a face view of which is clearly seen in Fig. 2 and edge views in Fig. 4, together with a stud (1 upon which said driver is pivoted, so that its opposite end, which engages with the heel of the shuttle, is freefor example, to swing away from the shuttle, as shown in Fig. 1 to open a loop-releasing space behind the shuttle-heel at the proper moments, while said stud loosely engages with the throat of the shuttle at all times. For so moving the free end of the driver (1 away from the heel of the shuttle a stationary grooved cam G depends from the cloth-plate C, close to the shuttlerace at its right-hand side or back, and its groove 6 engages with a stud (Z' on the back of the driver at said free end of the latter, and as the driver revolves it is thus positively actuated with very little friction and no noise. lVithin said fixed cam G which is annular, and at its right-hand side, the under shaft S carries a lifting-cam C and farther to the right a stroke-cam, (not shown,) or it may be a single cam possessing both functions, which, in conjunction with a suitable feed-bar (not hown) and its appurtenances, constitute the feed mechanism of themachin e.

The feed-dog f, Figs. 1 and 2, works within a space at the top of the shuttle-race and through the cloth-plate or a throat-plate inserted therein in customary manner.

The shuttle-race R and its cap 0 are open at top, where the shuttle engages with the needle-loops, as is customary. Immediately in front of this point a pair of stationary guards g g are attached by screws to the back of the race and to the cap, respectively, as illustrated by Figs. 1 to S, inclusive, and the shuttle s is provided near its perimeter with grooves g, concentric with the periphery in its face and back, which receive the points of the guards as the shuttle rotates. The thread is thus held back and kept from being drawn into the groove of the shuttlerace. The guards are shown in their fixed positions in the respective figures, while the rotary shuttle is shown in several of its positions. Fig. represents the nose of the shuttle as approaching the guards. Figs. 6 and 7 represent the interengagement of the guardpoints and grooves after the nose of the shuttle has caught the needle-loop. Fig. 8, in connection with Fig. 2, illustrates the full engagement of the guard-points and grooves in other positions of the shuttle, and Fig. 1 represents the heel of the shuttle as about passing the guard-points.

To adapt the shuttle-race cap 0 to yield, so as to prevent the stopping'of the machine or excessive friction in case particles of thread or lint should get into the shuttle-race groove, the cap is attached to the. face of the racebracket by screws 8 having spiral springs 3 Fig. 9, or it may be springs of other forms, interposed between their heads and the cap. These springs permit the cap to yield outwardly at any point to a limited extent and immediately restore it to its seat when the obstruction escapes.

Details and accessories which are not above specified may be of any approved description, and I do not limit my respective claims to specified details except as therein stated.

Having thus described my said improvement in rotary-shuttle sewing-machines, I claim as my invention and desire to patent under this specification 1. I11 combination with a rotary shuttle and a shuttle-race for the same, a shuttle-driver disk provided on its face with a shuttle-driver movable thereon, and a stud upon which said driver is pivoted, the said stud occupying a re-entrantcurve behind the nose of the shuttle, while the free end of the driver engages with the shuttle-heel, substantially as hereinbefore set forth.

2. In combination with a rotary shuttle and a shuttle-race for the same, a shuttle-driver disk provided on its face with a shuttle-driver movable thereon and having a rearwardly-project-ing stud-pin, and a stationary cam engaging with said stud-pin, whereby said shuttledriver is periodically retracted as the shuttle rotates to release the needleloops, in the mannerset forth.

8. A rotary shuttle having in its face and back near its perimeter grooves concentric with its periphery, in combination with stationary race-guards having pointswhich project into said grooves, substantially as hereinbefore set forth.

4. In combination with a rotary shuttle and a stationary shuttle-race having a groove which embraces the perimeter of the shuttle, a shuttle-race cap forming one side of said groove, screws which attach said cap, and springs interposed between the heads of said screws and said cap, substantially as hereinbefore specified, for the purpose set forth.

5. In combination, a loop-taker guide, a rigid segmental cap therefor, headed screws for securing the cap to the guide, and springs arranged between the cap and the heads of the screws, substantially as hereinbefore specified. I

ARTHUR M. LESLIE.

Witnesses:

E. J. BAKER, O. M. SANDERS.

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