US51383A - Improvement in waxed-thread chain-stitch sewing-machines - Google Patents

Description

PATENTED 1350.5, 1865; E. E. BEAN. WAXED THREAD CHAIN STITCH SEWING MACHINE..-

2 -8HEET88HEET 1.

YHE-NORRIS versus ccv FHOfO-LITHQ, WASNINGTON, D c.

ATELoh EDWIN E. BEAN, OF ABINGTON, ASSIGNOR TO HIMSELF AND JACOB CHICK- ERING, OF ANDOYER, MASSACHUSETTS.

IM PROVEMl-INT -|N WAXED-THBEAD CHAIN-STITCH SEWING-MACHINES.

Specification forming part of Letters Patent No. 61,383, dated December 5,1865.

of Massachusetts, have invented certain new and useful Impro vements i n Chain-Stitch Wax- Thread Sewing-Machines, of which the following is afull, clear, and exact description, reference being had to the accompanying drawings,

making part ofthis specification, in which- Figure l is-a side elevation of my improved waxed-thread sewin g-machine, aportion of the frame being broken away to show the ecceiitric on the driving-shaft. Fig. 2 is a vertical transverse section through the same on the line a: 01:, of Fig. 1. Fig. 3 is a plan of the under side of the machine. Fig 4 is a section on the line 3 y of Fig. 3; Fig. 5, detail, to be referred to hereinafter.

In thatclass of sewing-machines known as chain stitch wax thread machines as at present constructed, a number of large cams are employed to drive the various moving parts. These cams, however, occupy much space, and their friction is such as to occasion considerable noise and also require a large amount of power to drive them.

My invention, which relates only to chainstitch wax-thread sewing-machines, has for its object to overcome these ditficnlties and to dispense with the employment of cams, thereby enabling me to simplify the machine and reduce the number of parts, as well as the amount of power required to drive it; and my invention consists in actuating the needle-lever by means of a crank-pin on the driving-shaft working in a curved slot in the needle-lever, or parts connected therewith,in combination with ahooked needle and cast-off; and my invention also consists in operating the aw], presser-foot, and thread-guide of a'Ichain-stitch wax-thread sewing-machine by means of a single shaft in the neck ,of the machine, which shaft is suitably connected with the driving shaft,

. thereby enabling me to dispense with the levers an d cams'heretofore used for this purpose; and my invention furthermore consistsin certain other details, which will be particularly described hereinafter.

To enable others skilled-in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

\ In the said drawings,A is the frame,'and By the bed-plate, of the machine.

(J is the driving-shaft,which runs in suitable bearings, a, and carries at its outer end the flywheel D. bis the needle-stock, whichcarries the needle 6 and moves up and down in suitable bearings in the frame E, which is supported by a bracket,

F, secured to the under side of the bed-plate. G is a plate, (showndotted'in Fig. 2,) a block,

'0, projecting from which slides up and down within the frame E, and is secured by a pin,

d, to the needle-stock b. A slot (shown dotted in Fig. 2) is cut through the plate G, ih-which works a slide, 6, on a pin, f, projecting-out front a slide, g,which is made adjustable in a groove in the needle-lever H by means of a setscrew', 71, Fig. 3. They needle-lever H is pivoted at z to a stud, j, whichis made adjustable with a screw and nut-in the slot k in the bracket F.

I is a plate, which is seeured'to the needlelever H by screws Z, Fig. 4, and has cut through it a curved slot, m, (Fig. 4)in which works the 'roll n on the era k-pin o, projecting from the disk J on the en of the driving-shaft, and thus, through theconnections explained, as the driving-shaft is revolved, the required vertical. motions are im parted to the needle without the employment of a large can], the friction of the roll n in the curved slot m, being very little and requiring very little power to operate it, while at the same time much space is economized.

p is the cast-ofl, which}. passes between the loop and he needle, so as to throw theloop out of the hook beforethe nextloop is brought down in a well-known manner.

q is the stock of the cast-oh, which has its bearin gs in the frame E, and is. prevented from turning by means of the pin 7', which moves in a slot, 20, Fig. 2'. The. required movements are imparted to the cast-olfbymea-ns of the collar 8 on the needle-stock b, which strikes alternately against the collar 13 and pin a on stock g. This stock q is prevented from falling by its own weight by means of a strip of leather, 1), which is pressed against it by the plate 20 and set-screw z. I

The length of throw of the needle-stock can be varied by loosening the screw h and moving the slide 9 with its pin f toward or from the center i, as may be required. 7

K is a plate secured to the under side of the 2 I a seesaw i of an arm, M, which is attached to a rock-shaft N, which passes through the bent portion 0 of the plate K and carries atits opposite end the lever P, the outer end of which is depressed by a projection (not shown) on the collar 0,

i which thus rocks the shaft N and causes the screw (1 to carry forward the shaft L, and bring the pin 1) into contact with the thread, and thus feed forward the material as required. This feeding of the material takes place immediately after the needle has been drawn down with the loop and while the presser-footis raised from off the material. f is a spring which bears against a pin, 9. and serves to return the shaft L to its original position, a piece of leather, h, being interposed between the plate K and pin a, so as to cushion it when retracted by the spring.

'I will now describe the manner in which the thread-guide, awl, and presser-foot are operated.

Q is a rock-shaft having its hearings in the neck R of the machine.

S is a rod, one end of which is pivoted to a short arm or crank, i, on the shaft Q, and the opposite end is connected to the strap of an eccentric, T, on'the driving-shaft G, and thus, as the driving-shaft is revolved, a rocking mo tion is given to the shaft Q. This shaft carries at its outer end a disk, U, in which is cut a cam-groove, j, in which works a pin, 7, pro- 1 iecting up from a crank, it, on the top of a vertical shaft, V, which has its bearing in the outer portion, 8, ofthe neck R, and carries at its lower end the thread-guide 1 through an eye, 9, Fig. 2, in which the thread is passed;

and thus as the disk U is rocked the curved portion of the groove j strikes the pin 7 and turns the shaft V and thread-guide I, so as to carry the thread into the heck of the needle. 16, which is at that time, through the connections explained, projected up into a position to receive it through the hole made by the awl in the material being operated upon.

W is the awl-shaft, which has its hearings in the portion 8 of the neck R, and carries at its lower end the awl 10. To this shaft W is pivoted the connectin g-rod m, the opposite end of which is pivoted at 11 to the disk U, and thus, as the disk is rocked, the awl-shaft is moved up and down at the required times 'to make the holesin the leather for the needle to pass up through.

a is a guide-block, which is secured to the shaft W and works in a vertical slot, 12, Fig. 5, in the plate X. I

Y is the presser-foot, the shaft 0 ofwhich has its hearings in the/portion S of the neck R, and has secured t6 it a guide-piece, p, which works in a vertical slot, 13,Fig. 5, in the plate X. This shaft 0 passes through and is socured to a block,'q, which is steadied by a guide-piece, 0", also working in a 'vertical, slot, 14, Fig. 5,- in the plate X.

is is a spring. one end of which is fast to the plate X, while the other end bears against the guide-piece p' and keeps the presser-foot Y in the position represented in Figs. 1 and 2. t is a liftin g-dog, the upper edge, 15, of

which engages'with a latch, a, pivoted, at v,

to the block q, and thus as the disk is rocked the block q, and with it the presser-foot, is lifted until the inclined portion 16 of the latch u comes into contact with the lower end of the screw 17, when the latch is forced outward and disengaged from the lifting-dog t, and the shaft 0 is carried down by the spring s, so

as to bring the presser-foot Y into the position seen in Figs. 1 and 2, holding it firmly down onto the material during the time that the awl ismaking the hole and the needle is in thematerial. The presser-foot, is raised the instant the needle has descended with the.-1oop beneath the leather, so as toleave the leather free to be fed-forward by the pin 1) striking against the thread, as before explained.

-A spring, 18, serves to press the latch to up against the lifting-dog t.

' Themotions. of the awl, thread-guide, and presser-foot are all properly timed with respect to each other, and, as they are all three-actuated by the disk U, there is no danger of their becoming disarranged independently of each other, which is liable to happen where they are operated by separate cams and levers and by thus avoiding the use of the cams'and levers heretofore employed for this purpose I am enabled to greatly simplify the machine'and reduce the friction, noise, and power required to drive it, while a less quantityof oil is required to lubricate it, on account of the reduced amount of bearing-surfaces, one eccentric only onthe driving-shaft being employed, instead of the two large cams heretofore used; and it .will be seen that the construction of this ma chine is such that all the working parts are easily accessible for the purpose of oiling or cleaning them.

By the employment of a single shaft in the neckof the machine, instead of a lever or levers, as heretofore, I am enabled to place the. neck at any required height above the table to accommodate different kinds of vwork, which could not be done where levers were employed, on account of the increased motion required for their lower extremities.

Instead of the shaft-Q'being'roeked, as above described, it may be connected by gears with the drivingshaft and revolved, the connections with the awl-shaft, presser-foot, and thread-guide being slightly varied, so as to allow of the disk U being revolved.

The "waxed thread is led from the spool Z,

- over the wheel A, andthrough the eye at the ordinary manner.

more complieated and expensive. I therefore end of the wire 19 to the thread-guide l in the I am aware that some of the devices employed in the above-described sewingmachine, have been used inlock-stitoh sewing-machines for sewing leather; but such. machineswere confine myself to their use only in chain-stitch wax-thread sewing-machines.

What I claim as my invention} and desireto secure by Letters Patent, is

1. Actuating the needle-lever of a chainstitch wax-thread sewing-machine by means of aerank-pin, 0, on the driving-shaft, and curved slot m, in combination with a hooked needle, 6, and cast-0E 11, substantially as and for the purpose set forth. 2. In a chain-stitch wax-thread sewing-machine, the shaft Q,for operating the awl, presser-foot, and thread-guide above the table, in i combination with a hooked needle, 6, and castchine, the disk U, awl-shaft W, and connecting-rod m above the table,in combination with a hooked ncedle, 6, and cast-off 1) below the table, substantially as set forth.

4. Operating the presser-foot Y" by means of the latch u, lifting-dog. t, on the disk U, and screw 17, substantially as described.

5. Operating the thread guide Z, by means of the earn-groove in the disk U, in combination with the crank k on the shaft Y, substantially as set forth. I

6. Operating the awl,presser.-foot,and threadguide by means of the same shaft, substantially as and for the purpose set forth.

Witnesses: E. E. BEAN.

- P. E. TEsortEMAo'HER,

N. W. STEARNS.

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