US1141041A

US1141041A - Thread severing and holding mechanism for sewing-machines.

Info

Publication number: US1141041A
Application number: US570856A
Authority: US
Inventors: John W Darley Jr
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-07-07
Publication date: 1915-05-25
Anticipated expiration: 1932-05-25

Description

J. W. DARLEY, JR.

THREAD SEVERING AND HOLDING MECHANISM FOR SEWNNG MACHINES.

APPLlCATlON FILED JULY 7. 1910.

i /km ,ronn tv. in, or summons, nenrtsnn Specification of lietters ?atent.

AND I l (91f:EEK 1M3v MECHANISIVIEOR SEWING-MACHINES.

Patented May 25, ltlilti'.

epplicetion filed/April. 6, 1910, ticriel lilo. 553,772. Bividcd and this application filed July 7, 1910.

fcriel lilo. crests.

T all wiiomqitmag concern Be it known that l, J OHN W. Deanna", .911,

a citizen oi the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Thread Severing and Holding Mechanism for Sewingl/lsohines; and 1 do declare the following to be e full, clear, end exact description oi the invention, such wille'nable others skilled in the art to which-it e ppertcins to make and use the some. i

My invention relates to improvements in thread severing and holding mechanism for sewing machines, and is especisll vdesigned for sewing machines used for attaching buttons to garments, but it is not restricted to his special class of sewing machines, as it is capable of general application.

This application is a division of my former application No. 553,772,1iled April is an inverted plan view of the severing 'inechanism, showing trimmers for the needle and shuttle threads and the holding dcvices for the needle thread, in the position of rest. Fig. '2 is a similar view, the operating part being omitted, and showing the ports in the position at the end of the first stitch. Fig. 8 is a, similar view, showing the parts in the position at the end of. the fourth stitch. Fig. 41 is a perspective view, on a larger scale, of the trimmers and one of the holding means for the needle thread. 5 is s perspectiveview of the other member of the holding device for the needle thread. Fig. 6 is a, cross-section on the line 6-6 of Fig. 4:.

The shuttle is supported below the bed plate in the usual manner and operates in the usual way. The additional new features neculiar to this invention are shown most clearly in Figs, e and 5.

26 end 27 are knives. of well, known construction, for severing the shuttle thread and needle thread, respectively, and the holder 28 is of well known construction also, and is adapted to hold the beginning end of the needle thread. The knives and driving gear 29 are all mounted on a pivotpin 30, and below the knife 27 is a curved guard 31, attached to the operating gear by the same screw 32 that holds the

knives

26 and 27 thereon, and it is kept in position by the pin 33', which also prevents the thread holder 28 from being displaced.

Attached to the throat plate 35 which forms a part of the body of the machine, by means of screws is a curvedjarm 36, which terminates at its free end in a flat portion 37, provided with lip-turned ends 38, which part 37 is adapted to lie in the path of the thread holder 28. The arm Ed is of spring metal, holding; the end 37 against the throat plate. unless is displaced by the thread holder 28. 1

40 represents the free end of the needle thread and 41 a hole in the throat plate, through which this needle misses.

The operation is as iollows:llhe machine is threaded and the button sewed on as described in my said companion applications, and need not be specifically described here. A loop is formed in the needle thread and the point of the shuttle hook enters this loop in the well known manner, and the further movement of the shuttle polls down the free end 40 of the needle thread through the hole 4 in the throat piste. During this downward movement, the needle thread is clamped in the well known manner, so that the thread cannot be pulled through the hole in the end of the needle toward the shuttle, thus causing the shuttle to pull the end 420 of the needle thread through the hole ll. The needle then continues to rise, and at a point near the end of the upward motion of the needle during the first stitch, the entire system of parts shown in Fig. moves, bringing, the hook; on the thread holder 28 across the hole ll in the throat plate, pulling the end 40 of the needle. thread along with it, and binding it between itself, the throst piste. end the portion 87 of the spring arm 36. The sewing then continues and during the second stitch, and. at about the time when the'shuttlc hook engages the loop in the needie thread, this thread is unclemped, so that "the need thread is drawn under the flat tened portion 37 of the spring arm 36, which springs up and clamps the end between itself and the throat plate as the hook on the thread holder 28 releases the thread. It is evident that it the end of the needle thread were not confined in some way after it is released by the thread holder 28, it would be caught by the loops of the needle thread during successive stitches, making an unsightly appearance on the under side of the fabric, which is avoided by the construction shown.

The parts remain in the position shown in Fig. 3, until the beginning of the tourteenth stitch (the machine being arranged to make that number of stitchesin sewing on a button, although any number of stitches mav be provided for), when the parts shown in Fig. 3 begin to move back to the position shown in Fig. 1, which position they reach at the end of the fourteenth stitch. During this operation, the thread holder 28 pushes out the end a0 of the needle thread from under the part 37 of the spring arm 36, and the pointed ends of the

knives

26 and 27 engage with the needle and shuttle threads, respectively, and as the machine stops the inertia of the parts gives a quick motion to the rod 42, which carries a rack engaging with the gear wheel 29. This motion is in the direction of the arrow shown in Fig. 1, and severs the needle and shuttle threads in the usual way.

After the threads have been severed, a spring, operating in the usual manner, restores the parts to their initial position, as shown in Fig. 1. During this cutting operation, as the parts are thrown in a counterclockwise direction from the position shown in Fig. 1, the heel 28* of the thread holder 28 passes from under the end 37 of the spring arm 36, and as the parts are retracted, under the influence of the aforesaid spring (not shown), the heel 28 of the thread holder, striking against the right hand part 38 of the end of the spring arm 36, has a tendency to throw this arm down, so as to cause it to come into the path of the rear end of the knife 27, but this actionis prevented by the curved guard 31, which limits the forward motion of the end of the spring 36.

I claim 1. In a thread severing and holding means, the combination with a throat plate, of movable'means for severing the needle thread, a plurality of clamping parts, including a stationary part, for holding the severed end of the needle thread between them, a member having a thread carrying portion operating between said clamping parts for carrying the severed end of said thread between said parts, said clamping parts being located beneath the upper surface of the throat plate.

2. In a thread severing and holding means, the combination of a movable means for severing the thread, with a plurality of clamping members including a stationary member for holding'a severed end, and a movable means attached to said severing means for bringing said severed end between said clamping members, said movable means also acting to eject said-severed end from between said clamping members.

In testimony whereof, I aflix my signature, in presence of two witnesses.

JOHN W. DARLEY, JR. Witnesses:

N. CURTIS LAMMQND, A. W.-NEALE, Jr.