US572335A

US572335A - Shuttle for sewing-machines

Info

Publication number: US572335A
Authority: US
Publication date: 1896-12-01
Anticipated expiration: 1913-12-01

Description

(No Model.)

T. CROSBY. v v.SHI'IITLE'FOR SEWING MACHINES.-

-No.572,335. a I PateritedD-ec. 1,1896.

mizwsses: I I

UNITED STATES PATENT OFFICE.

I'IANFORD T. CROSBY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BERTRAND SEIVING MACHINE COMPANY, OF PORTLAND, MAINE.

. SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 572,335, dated December 1, 1896.

' Application fil d March 14,1896. Serial No. 583,240. (No model.) I

, is a specification.

My invention relates to shuttletension devices, and is designed especially for rotary shuttles for wax thread sewing machines; and it consists in certain novel features of construction, arrangement, and combination of parts, which will be readily understood by reference to the description of the accompanying drawings and to the claims hereto appended and in which my invention is clearly pointed out.

Figure 1 of the drawings is a front elevation of a wax-thread sewing-machine shuttle with my improved tension device applied thereto. Fig. 2 is an edge view of the same. Fig. 3 is a partial section on line a; m on Fig. 1. Figs. 4 and 5 are respectively an inverted plan and an edge view of the tension-spring. Fig. 6 is a perspective view of the bobbin-retaining plate, and Figs. 7 and 8 are respectively a sectional elevation of the bobbin-stud and a plan of said stud with clamping-screw removed.

In the drawings, A is the shuttle-body, provided with a chamber to receive the bobbin B, which is mounted upon and revoluble about a fixed stud or journal a, set in the shuttle-body with its axis coinciding with the axis of said chamber and having a small section of its length at its outer or front end made flat-sided, as shown in Figs. 7 and 8.

O is a plate having an open-ended slot 1) formed in one end thereof, adapted to receive the flattened portion of the stud a, and c is a clamping-screw fitted to a threaded hole in the end of the stud a and having a head of a diameter not greater than the diameter of said stud, but adapted to bear upon the plate 0 at either side of the slotb to clamp said plate to the stud a, so as to retain the bobbin upon said stud and at the same time allow it to revolve freely thereon.

The plate 0 is provided at its end opposite to the slot 1) with the outwardly-projecting ear d, in which is formed the thread-guiding eye cl.

The shuttle-body A has formed therein the thread guiding or delivering opening 6, near the root of the hook A and communicating with the interior of the bobbin-chamber between the flanges of said bobbin.

D is a tension-spring provided on its inner face with an annular lip d surrounding the screw-hole f, through which the screw 9 is screwed into the shuttle-body to clamp said spring firmly thereto, and h is a screw passing through said spring and threaded into the shuttle-body as a means of adjusting the movable end of said spring to a greater or less distance from the body of the shuttle to regulate the tension of said spring upon the thread 2', as shown in Figs. 1, 2, and 3.

A hook E is set in or secured to the shuttle-body near the root of the hook A, and a similar hook F is secured to said shuttle at the opposite end of the spring D, as shown in Figs. 1 and 2. The shuttle-thread passes from the bobbin B through the'opening e, under the end. of the spring D, under the head of the hook E, under the outer edge of the spring D, under the head of the hook F, and thence through the eye d of the plate 0, as shown in Figs. 1 and 2.

To remove the bobbin for refitting the same, it is only necessary to slacken the screw 0 and withdraw the plate 0 from beneath it, when the bobbin may be removed from its supporting-stud a and be replaced thereon and again secured in position by inserting the slotted end of the plate 0 beneath the head of the screwc and tightening said screw thereon. This arrangement of the several parts of the shuttle,its bobbin, and the thread- 0 threadde1ivering opening through the peripheral Wall of said chamber; a leaf-spring secured to the front face of the shuttlebody and having its contact-surface with the front face of said shuttle-body parallel to the plane of revolution of said shuttle; a pair of thread-guiding hooks set in said front face of the shuttle-body, one at or near each end of said spring; and the plate 0 provided with the thread-guiding eye 01, cl.

2. The combination With a rotary shuttlecase provided With a bobbin-chamber and With the thread-delivery opening 6 and a bobbin-carrying stud set therein of a bobbinretaining plate secured in a fixed position on said stud and provided With a thread-guiding eye at or near the axis of the shuttle-body;

the spring D; the clamping-screw g; the adjusting-screw 72/; and the hooks E and F.

3. The combination of the shuttle A provided With the stud a, and the delivery-opening 6; the bobbin B; the spring D provided with the annular lip d the clamping-screw g; the adj Listing-screw h; and the hooks E and F.

I11 testimony whereof I have signed 'my name to this specification, in the presence of two subscribing Witnesses, on this 12th day of March, A. D. 1896.

HANFORD T. CROSBY.

\Vitnesses:

N. G. LOMBARD, F. O. HALL.