US31691A - Improvement in sewing-machines - Google Patents

Description

G. JUENGs-Ig Sewing vlalchine.4

No. 31,691. Patented March-12, 1861'.

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UNITED STATES ATEN'r Ferrer..

GEORGE JUENGST, 0F NEW YORK, N, Y., ASSIGNORTO J. MCGRSSAN AND T. J. MGART'HUR, oFsAME PLAGE.

IMPROVEMENT IN SEWING-MACHINES.

Specification -forming part of Letters PatentNo. 31,6911, dated March 12, 1861.

ing-machines Where the straight needle is used with the shuttleaud the feed-wheel, and they have reference to the means for giving motion to the needle, specially regarding the formation and condition of the loop of the needles thread, to means for taking up the thread and tghtenipg the stitch, and to means for making and regulating the feed.

The drawings forming part of this specilication represent a sewing-machine of the class above named with myiinproveinents connected therewith, Figure l of these drawings being a side view ofthe machine, with the side plates of the table and shafts frame removed so as the better to exhibit the interior; Fig. 2, a iront view of the same; Fig, 3, a top view of the feed-wheel and shuttle, with the plates covering the shuttles chamber removed; and Fig. 4, a view by transverse section of the cam on the feedingshaft and the roller against which it acts on the feeding lever.

In each of these gures, where like parts are shown, like marks and letters are used to indicate them.

Inusmuch as several parts of this machine do not differ materially from other machines, this description will he limited to such parts as constitute my invention, with such other parts as it may be necessary to naine in order properly to set out the construction and operation of the invented parts.

The ncedle-bar rt and the take-up b derive their' motions from a shaft. o, which lies out of line both horizontally and vertically with the power or main shaft d. The needle-bar is counected to the shaft o by a bar or rod, e, affixed at its upper end to the crankpin f and atits lower end to the needle-bar pin g. The take up is rigidly attached to the bar e, as shown at h, so that the har e is the means for connecting both the needle-har and take-up to the shaft c at one point. Shafts d and` c are connected to each other through the intervention of a link, t', fitting at one end onto the crankpinjofshaftc and at the other end on the crankpin l of shaft d; and it will readily be perceived that when thus connected to each other the rotation ofthe two shafts will not be in unison, and that while shaft d has continuous regular rotation shaft c has intermissions in its motions, which are very nearly periods of rest, that occur at certain points of revolution, and are due to the relative position ofthe two shafts and crank-pins. As shown by the drawings, the link pulls the shaft c. Byah tering the position of the crank-pins the link can be operated so as to push that shaft, and such alteration can easily be brought about by loosening the collars of the cranks and changing their positions on the shafts. The main shaft may run entirely through the neck and have a crank and link connected with another crank revolving on 'a stationary stud attached to the faceplate or other stationary part of the machine, the stud being out of line of the main shaft, and the same motion be produced as by the shafts above named.

In this arrangement the link may pull as well` as push.

By the means here recited and the arrangement of them such motions will he given to the needle aiid the take-up as will form the loop of the needles thread of the proper dimensions and form for the safe passage of the shuttle, holding the loop while the shuttle is passing through it, and taking np and tightening the stitch with great regularity and exactness, and the adjustabilit-y ofthe crankpins will allow of the perfect adjustability ot' n the needles and the take-ups motions. These parts, as arranged on the machine, (shown by the drawings,) give to the needle a rapid downward motion, a period nearly of entire i rest while the shuttleis passing through the loop, and a rapid upward motion, and to the takenp motions in unisoh with the movements of the needle, taking up the thread and tightening the stitch on the upward motion of the needle, the action ofthe take-up being performed in part by the stationary guides m and n, the track of the thread from the spool o to the needlep fullyindicating the change-s which will occur during the motions of the needle and take-up.

The shuttle derives its motion from an arm, g, of shaft r, which arm actuates lever s, the upper end of which is connected to the frame of theshuttle. meeting-rod, t, attached at its upper end to crank-pin Z of the main shaft d and at its lower end to an arm, u, of a collar, fu. upon its shaft. Shaft t" also actuates the feeding-wheel te, the shaft a: of which is supportedin a bearing-plate, `t/,afflxed to the table of the machine, andy the feed-wheel w is moved by the following means: Around shaft x, next to the wheel w, is a loose collar, a, which has an arm, z', extending downward; A vibratingl curved lever, y', is pivoted at w to this arm z', and to the end of lever y is pivoted, at fw', a block,

e', the bottom face of which rests upon the' face u' of the wheels recess. The block c is nearly of triangular form. the faces of its edge being slightly curved to fit the face of the recess ofthe wheel on which it operates. Being of this form and pivoted on the lever, as one face becomes worn it can be moved around on its pivot and another face be substituted for that too much worn. A spring, t', isattached Aat one end to an arm, s', of the lever y', and at the other end to a plate, r', of the frame of the machine. The tendency ofvthis spring is to draw the end s of the lever and the block e forward and upward, carrying the face of the block c along the face of the Wheels recess. The other end of the lever y has a pin, g', upon which is a frictionroller,p. By the connection of lever y to the arme', and by the springt', the rollerp is kept in contact with a cam, o', and the straight face n. of acollar, m', movable on shaft r as the shaft is vibrated, bringing the cam or the straight face against the roller. From an arm, l', of the movable collar fm to the arm q of the shaft r passes a spring, j', the tendency of which is to keep a stud, t", of the collar m against the end of an adjusting-screw, h', which passes through an arm of shaft r. Now, as shaft r is vibratcd it Shaft o' is operated by a con.

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carries with it the collar m' and brings the cam o and the face n in contact sooner or later with the roller p of lever y', as the screw h may have its inner end farther in or out. the screwing of it in moving the collar earlier and the turning of it out moving the collar later, and thus operating lever y to a. greater or less distance. As the roller end of lever y is moved by the upper part of the face n the feed takes place, the block e ou the other end of the lever gripping the face of the wheels recess, the feed ceasing while the roller is on the canis face, and the block e being carried forward by the spring t as the roller on the return movement of the shaft slides down the face ln'. 1

It will thus be seen that the stud t" and the end of the screw h are at all times in contact, and that the distance screw h' is in the arm ot' the shaft r determines the feed and stitch, thefeed being the least when the screw is farthest in the arm and the greatest when the least in the arm.

What l claim as my invention, and desire to secure by Letters Patent, is-

1. The arrangement of the shafts, cranks, and link, as herein set forth, for operating the take-up and needle, so as to leave the loop of the needles thread in proper position and condition forallowing the shuttle to pass freely and safely through.

2. The take-up attached to the connectingrod of the needle-bar, and so arranged in relation to the two stationary guides as t control the thread through all its movements and tighten the stitch, as described.

3. Regulating the feed by the screw and stud, the two being in contact at all times and operating as described.

Thisl specification signed this 18th day of August, 1860.

GEORGE JUnNesT.

Witnesses:

T. T. EV ERETT, JosIAH M. SMITH.

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