US683932A - Chain-stitch sewing-machine. - Google Patents

Description

No. 683,932. Patented Oct. 8, I90I. J. C. GDDDWIN.

CHAIN STITCH SEWING MACHINE.

(Application led Oct. 3, 1900.)

No; 683,932. Patented. ont. a', mol;

J. C. GGGDWIN.

CHAIN STITCH SEWING'MACHINE.

(Application led Oct. 3, 1900. (No Model.) 2 Sheets-Sheet 2.

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UNITEDd STATES I PATENT OFFICE.

JULIUS C. GOODWIN, OF PHILADELPHIA, PENNSYLVANIA.

CHAIN-STITCH SEWING-MACHINE.

SPECIFICATION foaming part bf Letters Patent No. 683,932, dated toter s, 190i.

. Application filed ctober 3, 1900. Serial No. 31,850. (No model.)

T0 all whom' t may concern.'

Be it known that I, JULIUS C. GOODWIN, residing at 3137 Euclid avenue, Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Chain-Stitch Sewing- AMachines, of which the following is a specifishowing the guard-plate in section ill ustratingv myinvention. Fig. 2 is aplan view of the looping mechanism. Fig. 3 is a plan Viewof the looping mechanism, showing the looper in the opposite position from that shown in Fig. 2. Fig. 4 is a vertical section taken on Vline 4 4, Fig. 2. Fig. 5 is a sectional View on line 5 5,

Fig. 1. Fig. 6 is a sectional view on line 6 6, Fig. l. Fig. 7 is a sectional view on line 7 Z, Fig. 4.

Referring to the drawings, A represents the bed-plate of the machine, and A a standard or upright, having an arm A2, in which is mounted in bearings a ct the reciprocating needle-rod B, carrying the needle B. Secured in the standard A is a shaft C, upon which is fulcrumed the lever C. The portion C2 of said lever is connected by a balljoint with the eccentric C3 upon the drivingshaft D, from which motion is imparted to said lever C. The lever C is also provided with an arm C4, which imparts motion to the bell-crank lever O5 through the medium of the connecting-rod C6. Said bell-crank 1ever C5 is pivoted on the stud-shaft C, secured in the arm A2. The oute`r end of said bellcrank lever is connected, by means of a link b, to the rod B, carrying the needle B', and imparts a reciprocating motion thereto. By

communicating the power'to the needle in this manner it will readily be seen that the A2 may be increased,'which was impossiblev under the old construction. v In Fig. 5 is shown the manner of mounting the stud-shafts C or C6 in the arm A2 of the machine. Upon one end of the shaft is formed a cone c, while uponthe other end of said shaft is loosely mounted a cone c, which is heldin position by means of a set-screw c3. The shaft is permitted to turn in conical bearings formed in the arm A2, a projecting boss A3 being provided on one side of said arm for the purpose of making a rigid bearing for the shaft.'

In Fig. 6 is shown the manner of constructing the ball-joint between the arm C4and the connecting-rod C. The ball Cl is mounted upon the bolt Cs and is provided with bosses C", which bear against the bifurcated end of lthe lever C4.

Upon the bed-plate A are provided bearings a a'. (Clearly shown in Figs. l and 4:.) Mounted upon a shaft as, carried by the bearings a' a', is a rocking frame E. Said rocking frame carries a shaft e, to which is pivoted the horizontal frameV F, carrying the louper-bar H. Said frame has an arm f, as shown in Figs. 2 and 3, which is connected to the link G. Said link G is pivoted on the shaft g, which is mounted in the bearings o2 a2 on the-bed-plate A. To the link G is attached the connectingl rod g4 of an eccentric G on the driving-shaft D. Said eccentric is adj ustably attached to said link by means of the link having an elongated opening g2, through which passes the bolt g3 of the eccentric-rod g4, thereby permittin g the amount of motion of the link4 G to be readily adjusted.

In the horizontal frame F of the looping mechanism is a sliding bar H, which is permitted to move in the grooves f2 of the frame F and is held in position by the plates f3. At

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the end of the sliding bar H is provided a lug h, in which is secured the looper I.

Secured to the under side of the sliding bar II is a projection h2, having mounted therein a shaft h3, the end of which is spherical and forms a universal joint in the head 71,4 of the connecting-rod h5. Said connecting-rod is attached to the arm C7 of the lever C and communicates a reciprocating motion to the looping-bar I-I, carrying the looper.

A device is provided for taking up the slack thread in the looping mechanism, consisting of a lever J, pivoted atj to the frame F and connected at the pointj2 with the sliding bar H by means of a connecting-bar ja, which is pivoted to said bar H at the point ji. The lever J has a verticalprojection l7'4, in which is provided a hole j, through which passes the looping-thread. The essential feature in the construction of this take-up device is the place of pivoting the connectingbarj the lever J. It is necessary that the pivotj2 should be situated at a point less than one-half the distance from the fulcrum j to the end of the lever J, thus giving sufficient motion to the outer end of said lever to take up the slack thread when the sliding plate H is withdrawn.

Between the armfof the frame F and the link G is provided an eccentric-stud G2, the construction of which is more clearly shown in Fig. 7 and is used for adjusting the position of the looper in relation to the vertically reciprocating needle. The end of the link G which receives the eccentric-stud is constructed in the form of a clamp, and by means of the set-screw g the eccentric-studl can be rigidly held in its proper position.

The operation ot' the sewing-machine is as follows: Power is applied to the belt-Wheel d on the driving-shaft D. On said shaft is an eccentric C3, which communicates power to the lever C', and this lever through the medium of the rod C6, the bell-crank lever C5, and the link b gives a reciprocating motion to the needle-carrier by the vertical rod B, as above explained. When the needle B is being raised, the bar H, carrying the looper I, is being moved forward by the arm C7 of the lever C", and the looper I passes back of the needle B and in front of the thread carried by said needle, thus holding the thread to form the first part of the loop. The frame upon which the looping mechanism is carried receives a. lateral motion from the shaft D through the eccentric G, as shown in Fig. 4, thus allowing the vertical needle B to descend back of the looper I, completing the stitch. The looper I is then Withdrawn to the position shown in Fig. 3, the take-up device drawing the slack thread through the guide f4 as the needle B' is withdrawn. The feed mechanism K (shown in Fig. 1) is operated by the eccentric L and the cam M, operated by the shaft D in the usual manner.

Having thus described my invention, I claim and desire to secure by Letters Patentl. In a sewing-machine, the combination of a looper mechanism, a driving-shaft, a rocking frame pivoted on a shaft mounted in bearings on the bed-plate of the machine, a horizontal frame for carrying the looper-bar, a shaft carried by the rocking fra'me,on which said horizontal frame is pivoted, a link, an adjustable connection between said link and the horizontal frame, shaft and bearings on which said link is pivoted and an eccentric on the driving-shaft for operating the same, substantially as described.

2. In asewing-machine, the combination in a looper mechanism, of a horizontal frame, a take-up device consisting of a lever pivoted to the horizontal frame, projection on said 1ever, aperture insaid projection through which passes the looper-thread, connecting-linkpiv oted at one end to the lever at a point less than one-half the distance from the fulcrum to the end of said lever, said link pivoted at its opposite end to the sliding looper-bar and a loop f4 secured to the frame for guiding the thread, substantially as described.

3. In a sewing-machine, the combination in a looper mechanism, ofa driving-shaft, a rock; ing frame, a horizontal frame, a reciprocating bar, grooves in said horizontal frame in which said bar slides, plates secu red to said horizon# tal frame to hold the bar in place, and a projection on said bar adapted to receive the looper substantially as described.

4t. In a sewing-machine, the combination in a looper mechanism, of a rocking frame, ahoriJ zontal frame, an eccentric-stud mounted be tween said horizontal frame and the link for i adjusting the position of the looper, a linkV carrying said eccentric-stud, a clamp formed in said link for clamping said eccentric-stud, adjustable connection between said link and the eccentric on the driving-shaft, substan tially as described.

In testimony whereof I have alxed my sig-V nature in presence of two witnesses.

JULIUS C. GOODWIN. Witnesses:

ROBERT W. LLOYD, WM. F. DONNELLY.

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