US259296A - Sewing-machine - Google Patents

Description

(1T0 Model.) 5 Sheets-Sheet L O. A. DEARBORN.

SEWING MACHINE.

Patented June 13, 1882.

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SEWING MAGHINE. No. 259,296. Patented June 13, 1882'.

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(No Model.) 5 Sheets-Sheet 3. G. A. DEARBORN.

SEWING MACHINE.

No. 259396. Patented June 13, 1882.

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SEWING MACHINE. No. 259,296. Patented June 13, 188.2.

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(No Model.) 5 Sheets-Sheet 5. G. A. DEARBORN.

SEWING MACHINE.

No. 259,296 Patented June 13, 1882.

% 7% Maw/$6M" 'Nrrnn STATES CHARLES A. DEARBORN, OF CHICAGO, ILLINOIS.

SEWING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 259,296, dated June 13, 1882.

Application filed November 26, 1880. (No model.)

To all whom it may concern:

Beit known that I, CHARLES A. DEARBORN, residing at Chicago, in the county of Cook and State of Illinois, and a citizen of the United States, have invented new and useful Improvements in Sewing-Machines, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure l is an elevation. Fig. 2 is abottom view. Fig. 3 is a detail, being a rear view of one end of the machine. Fig. 4 is a section at line 00 of Fig. 1, some parts being omitted. Figs. 5, 6, and 7 are details of the take-up. Fig. 8 is a detail in elevation. Figs. 9, 10, and 11 are details of the feeding-cam. Figs.l2 and 13 are views of the presser-foot. Figs. 14, 15, and 16 are views of the tension devices. Figs. 17 and 18 represent the bobbin-winding devices.

This invention relates to improvements in sewing-machines; and it consistsin a double feeding-cam located on the driving-shaft for imparting to the feed its forward and vertical movements, and at the same time regulating the extent of its vertical movement.

The invention also consists in the combination, with avibrating arm located above the bed-plate to move the needle-bar, a main drivin g-shaft located horizontally beneath the bedplate, and connecting devices for operating the arm from the shaft, of a forked lever pivoted at its upper portion above the main shaft, and a shuttle-lever operated thereby.

Other features of the invention will be fully described hereinafter, and set forth in the claims.

In the drawings,Arepresents the bed-plate of a sewing-machine.

B is the stationary arm, upon the end of which is a head in which the presser-foot and needle-bars move.

G is the arm,which operates the needle-bar, as usual.

D is the connecting-link.

E is a sliding bar,which carries a feed-dog, as usual.

F is the main driving-shaft.

G is the feeding-cam, which slides on the main shaft. It consists of two cams, a b, connected and moving together. The cam a is nearly cone-shaped, and gives to the feed its forward movement in the usual manner, and the cam I) gives to the feed its upward movement, and is slightly tapering only 011 one side (see Figs. 9 and 11) for the purpose of varying the distance which the'feed is raised as the length of the stitch is changed. The downward and backward movements of the feed are effected by means of a spring, 0.

c is a groove located at the outer end of this cam G. The two sections a and b, composing the cam G, are in such relation to each other as to maintain a proportionatevariation in the movement of the feed as the cam G is adjusted. The face of the section a of the cam Gr engages with a lip or projection on the feed-dog to give such dog its forward movements, and the face of the cam 11 engages with a second lip or projection on the feed-dog to give the dog its vertical movement, and the tapers of these sections at l) are in such relation to each other that if the cam is adjusted so as to give the dog but little horizontal movement it will also have but little vertical movement, and as the horizontal movement is increased the vertical movement will also be increased, and by having the two sections of the cam joined or united it will be seen that the same adjustment adjusts both the horizontal and the vertical movements of the feed-dog.

Vis a switch-lever, upon which is a pin which enters this groove a, by which means the sliding movement of the cam on the shaft F is effected and the length of the stitch regulated.

H is the shuttle-lever. l have not shown a shuttle, but use one which is cylindrical. This lever is pivoted to the bed-plate, and the shuttle-carrier d can be adjusted on the lever.

I is a forked vibrating lever, pivoted at its upper end in suitable bearings, 6, located above the shaft F. The fork of the lever embraces an eccentric, J, on the shaft F. One arm, f, of this fork extends below the shaft F. Its lower end is formed like a ball and enters a fork at the end of the short arm of the shuttle-lever. The

inner faces of the two arms of this fork, in which the eccentric J rolls, are so formed that a slightly-accelerated movement is given to the shuttle as it passes through the threadloop of the needle. There is a slot, 'v, in the metal above the fork proper, and the arms of the fork can be somewhat adjusted relatively to each other 'by means of a screw. The circular end or ball at the end of the arm f enters the slot in the rear end of the shuttle-lever, which slot corresponds in width to the diameter of the ball, but is elongated, so that as the fork Q vibrates the ball and slot will permit the rear end of the shuttle-lever to describe its movement without straining or affecting the parts, the slot allowing of the necessary travel to permit of the swing.

K is a vertical shaft, having a crank at the lower end. It is in suitable bearings, one of which is at the upper end and the other is above the crank. As shown, there is a square piece, 9, upon the lower end of this shaft; but this might be omitted, the round shaft being extended down sufficiently.

L is a cam on the main shaft F, against which the lower end of the shaft Kis held by means of the spring S, one end of which is connected with the shaft K and the other with the part B. Upon the upper end of the shaft K is a curvedtake-up arm,M, which vibrates beneath the spool-stand h with the movement of this shaft K. Upon the top of the standard j is a projection, i, to which the spool-stand h is secured by a screw, and there is room for the arm M between the top of j and the stand h. Fig. 5 shows the top of the standard j and arm M, the part it being removed. Fig. 6 shows the under side of h. This part h also serves as a protecting-cap for the arm M. The spoolpin a is secured to h. Thesprin g S is arranged to produce a resistance against the action of the cam L and maintain the crank at the lower end of the vertical shaft K in constant contact with the face of the cam, so that as the cam rotates it will act on the crank and give the vertical shaft K an oscillatory or vibratory movement, which movement is continued to the take-up arm M, and the movements given to the take-up arm are those required in the operation of the machine, the arm advancing as the needle-bar descends and receding as the needle-bar ascends.

By providing the slot or recess beneath the spool-stand for the play of the take-up arm M it will be seen that such arm is located so as to be out of the way, and a cover is provided therefor, by which the movements will be largely concealed, which features are desirable, in that the take-up arm is located so as to largely hide its vibrations, and at the point where it will produce no inconvenience to the operator.

N is a tension-disk, which is placed on a projection upon the arm B, having a knife-edge, k, so that the plate N can rock on such edge is as the end of the spring tension-plate 0, which rests on N, is moved up or down. Thus the disk N and spring 0 will constantly maintain the same position relatively to each other. The knife-edge is transverse to the tension-plate O.

The shank P of the presser-foot is open on one side, and is provided with a notch or open slot, 1. It is half-round and fits upon one side of the presser-foot bar, and is held in place by means of a set-screw, m, which passes through the slot 1. A hemmer could be attached to the same kind of a shank.

Q, is a collar rigidly secured to the shaft F, and upon its periphery is pivoted a dog, W, havin g a projection on its outer end to fit into a hole in the side of the hub 0 of the fly-wheel 1%, which is loose on the shaft F. The other end, a, of the dog stands out from the side of the collar Q, as shown in Fig. 17. A spring, 1', is used in connection with the dog, one end of which is attached to the pin or pivot on which the dog is mounted, and the other end attached to a pin or stud on the dog W, and said spring acts to throw the dog forward and make the engagement of the dog with the hub 0, as shown in Fig. 17. The end a of the dog Wis hooked, and it can engage with and be held by the part U.

T is the bobbin-winder, pivoted at p to the plate A. Except as described, the winder is made as usual.

U is an arm extending downward from the bobbin-winder, and so arranged that when the winder is in position and the shaft F is in motion the innerend, a, of the dog \V will come in contact with the lower end of the arm U, disengaging the dog from the fly-wheel, and the dog will be held in such position till released.

The operation, so far as not already fully described, is as follows: The length of the stitch is adjusted by moving the cam G upon the shaft F by means of the lever V, and at the same time the changed position of that part of this cam marked 1) causes the feed to rise higher when the stitch is long than when short, which is desirable, as a long stitch is usually taken when sewingheavy goods, which require a stronger action of the feed. The shuttle-lever is operated by means of the vibrating forked lever I, which is operated by the eccentric J. The take-up arm M is operated by means of the vibration ofthe crankshaft K by means of the cam L. This shaft K being always held in contact with the cam L, its operation produces no noise. By placing the tension-disk N on a knife-edge transverse to the spring-plate O uniformity of action is secured, notwithstanding the position of the plate is changed. The presser-foot can be easily removed, and it can be adjusted laterally by turning the shank without removing the screw m. When the bobbin-winder is in position for winding, the dog W, coming'in contact with the arm U, will be automatically disconnected from the flywheel, which, being loose upon the shaft, will then revolve without driving the machine; but when the winder is turned a little on its pivot the arm U will be in such a position that the end a of the dog will not come in contact with such arm, and the action of the spring connected with the dog will cause it to automatically engage with the fiy-wheel, and then it will, when in motion, operate the machine.

The parts of the machine not described may be made in any known suitable manner.

A small weight, b, is shown in Figs. 14 and 15 located on the spindle for the tension-disk, above the tension-spring, for the purpose of acting as a check to the thread and preventin g kinking thereof and producing slack. The thread from'the spool passes forward underneath this weight b, and between its lower face and the upper face of the spring 0 to the forward slotted end of the spring, then down through the slot underneath the spring and between its under face and the upper face of the tension-disk N, then back to the eye in the take-up arm M, then forward through the guide or eye near the tension-disk, then to the guide or eye on the needle guide or head, and thence to the needle. By locating this weight b above the spring and passing the thread beneath it, it will be seen that any tendency of the thread to kink back of the slot will be obviated and the thread be held straight and taut at that point.

The take-up devices are very desirable. The action of the crank-shaft K is such that the takeup arm M is thrown back and takes up the thread at the proper time, and holds it until the needle has descended to the cloth. Then the arm is returned by the action of the spring S, and the thread is supplied to the needle as required. The location of these devices is such that they are out of the way, the arrangement is compact, and the arm M is almost completely protected by the spoolstand h.

It will otcourse be understood that the spoolstand could be cast on the upper end of the standard, a suitable recess or opening being formed to receive the vibrating take-up arm, and such construction I consider no departure from this part of my invention.

What 1 claim as new, and desire to secure by Letters Patent, is as follows:

1. The double feeding-cam G, consisting of two'cams, a [2, adjustable together on the driving-shaft F for the purpose of giving the feed its forward and vertical movements, and at the same time automatically regulating the extent of its vertical movement as the length of the stitch is changed, substantially as specified.

2. The combination, with the vibrating needle-lever located on the standard above the bed-plate, of the forked lever I, pivoted at its upper end, the main shaft F, located below the bed-plate A, the eccentric J upon the main shaft 1*, the shuttle-lever H, and connecting devices between the main shaft and the vibrating needle-lever, all constructed and operated substantially as and for the purposes specified.

3. The combination, with a vibrating arm located above the bed-plate to move the needle-bar, a main driving-shaft located horizontally beneath the bed-plate, and connecting devices for operating the arm from the shaft, of a forked lever, I, provided with an arm or extension, f, and pivoted at its upper end above the main shaft, and a shuttle-lever provided at its rear end with a fork to receive the said arm or extension of the forked lever, substantially as and for the purposes specified.

4. A vertical spring-shaft, K, having a crank at its lower end and located at the rear of the machine, in combination with a cam located on the main shaft and engaging the crank of the vertical shaft, and a take-up arm located at the upper end of the shaft, substantially as and for the purposes specified.

5. The tension-plate O and the disk N, in

combination with a knife-like edge, It, transverse to the plate 0, on which edge the disk rocks, substantially as and for the purpose specified.

6. The half-round presser-foot shank P, open upon one side, so as to fit upon a round footbar, and provided with an open slot, 1, whereby the presser-foot can be adjusted laterally, and can be removed without removing the holding-screw m, substantially as and for the purpose specified.

7. The bobbin-winder T, provided with an arm, U, in combination with the collar Q, rigidly secured to the main shaft F, the dog W, pivoted upon the collar Q, and the fly-wheel R, placed loosely on the main shaft F, substantially as and for the purpose specified.

8. The spool-stand h, in combination with the standard j of the arm 13, said spool-stand being located above the standard, whereby a space is provided between the two for the takeup arm, substantially as described.

CHARLES A. DEARBORN.

Witnesses:

E. A. WEsT, 0. W. BOND.

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