US1129827A - Thread-controlling mechanism for sewing-machines. - Google Patents

Description

I. W. MERRICK. THREAD CONTROLLING MECHANISM FOR SEWING MACHINES.

1,1 29,827. Patented Feb. 23, 1915.

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APPLICATION FILE-D NOV. 20, 1911.

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. UNITED STATES PATENT @FFLIGFE.

FRANK 1V. MERRICK, OF BOSTON, MASSACHUSETTS, ASSIGNOR T0 {THIGH LOCK STITCH COMPANY, OF BOSTON, MASSACHUSETTS, A. CORPORRTION OPE MAINE.

THREAD-CONTROLLING MECHANISM FOR SEXVING-MACHINES.

Specification of Letters latent.

Patented Feb. 23, 1915..

Original application filed September 19, 1910, Serial No. 582,599. Divided and this application filed November To all whom it may concern Be it known that I, FRANK W. MERRIGK, a citizen of the United States, residing at Boston, in the county of Suffolk, State of lvlassachusetts, have invented a certain new and useful In'iprovement in T hread-Controlling Mechanism for Sewing-hllachines, of whichthe following is a specification, reference being had therein to the accompanying drawings.

T 1e in\" ention has relation to the devices which are employed in hook-needle sewing machines for controlling the thread which is supplied to the needle.

The invention provides in improved mannor for the support and actuation of the thread-guide which lays the thread around the needle and into the open eye of the lat ter, and for the support and actuation of the thread-finger or thread-hook which draws out the length of thread which is to be pulled by the needle through the material being stitched in making the next stitch. The general objects in these connections are to simplify and improve the general construction of the machine, and to secure increased stability and durability. The machine is better adapted for high speed on different classes of work, and freedom from wear and breakages is attained.

An embodiment of the various features of the invention is illustrated in the accompanying drawings, in which.latter,

Figure 1 shows in side elevationcertain of the parts of a curved-needle sewing machine having the said embodiment applied in connection therewith, the take-up arm being partly broken away. Fig. 2 shows some of the said parts in plan. Fig. 3 shows the needle and awl and the actuating mecha-' nism therefor, omitted from Figs. 1 and 2.

The present invention is a division of that forming thcsnbject of my original application for U. S. patent for improvements in thread-controlling mechanism for sewing machines, filed Sept. 19, 1910, Serial No. 582,599.

Having reference to the drawings,the machine-frame is marked 1, and 2 is the main or driving shaft.

At 3 is the work-support, and 4 is the presser between which and the work-support the work a to be stitched is placed. The Presser-carrier is omitted.

Serial No. 661,372.

the main or driving shaft 2 through connections including a link 21, of which only a portion is shown in Fig. 1, having one end thereof connected pivotally to an arm 20 projecting from one carrier-segment. The

said link is connected pivotally at its other end to an arm 22, Fig. 3, of the transversely extending rockshaft 22 mounted in the machine-frame. A second arm of the said rockshaft is connected by means of a pitman or connecting rod 23 to a crank 24 with which the main shaft 2 is furnished. As the shaft 2 rotates, the two carrier-segments and the awl and needle mounted thereon are oscillated.

Whiter-ring, now, to the thread-guide by which the thread is laid around the needle and into the open eye-of the latter, it is shown at 25. Figs. 1 and 2. It is secured to a carrier-lever 536. I construct the said carrier-lever with an open huh-portion, shown best in Fig. 1, which encircles loosely a collar 27, Fig. 2, that is sleeved loosely upon the transversoly-extending horizontal needle-and-awl actuating rockshaft 22. The said hub-portion is swiveled to the said collar by means of upper and lower centerscrews 28, 28. As thus mounted, the thread guide car'rierdever is capable of swinging transversely in the direction of the length of the roclrshaft upon its pivotal connection with the collar, while in addition the carrierlever and collar are capable of oscillating around the rockshaft. For the actuation of the carrier-lever and thread-guide a cam 29 is fixed upon the shaft 2, such cam havtravel in the required path to lay the thread in the eye of the needle. In practice, a spring, 2-6", acts upon carrier-lever 26 with a tendency to press the cam-follower 26 toward the bottom of the cam-groove.

At 30 is the thread-finger or thread-hook by means of which the length of thread to be drawn through material a by the needle in descent of the needle is extended in a bend or h f It is secured to a carrierlever 31 *v lCl'l is mounted upon rockshaft e the collar 27 with capagity to turn loosely on the said rockshatt ancl is actuated by means of an edge-cam 32 on shaft 2, which engages with a cam-follower 31 carried by the rear arm of the carrierlever 31. In practice, a spring, 31", acts upon the carrier-lever 31 with a tendency to press the cam-follower 31 against the edge of the cam The employment of the needle-and-awl actuatin rierderers of the thread-guide and thread linger or threadhook provides effecti ely for the secure mounting of the said carrier-levers in the proper relative positions with respect to the other working parts to obtain advantageously the cotiperation of the threadguide and thread-finger or thread-hook with the needle, slack-thread controller, and takeop, and dispenses with separate studs or pivots, The general construction of the machine is simplified and improved, and durability and freedom from Wear and breakages are secured.

The needle-thread, as it extends from the source of supply, passes down into the wax p'ot 33, then up to and through a tensiondevice 34, then to the locking device, then to the take-up, and thence past a slack-thread controller and through the thread-guide 25 to the Work a.

The take-up consists of a vibrating arm 35 carrying two thread- engaging rolls 36, 36, and a cooperating thread-engaging roll 37 which is mounted on a pivot 38 upon the head-portion of the machineframe 1, the said roll -37 engaging With the thread at a point intermediate the points at which the two rolls 36, 36, engage therewith. The arm 35 is fixed upon one end of a rockshaft 39 extending through a sleeve bearing 40 in connection with the said head-portion of rockshatt 22 as a support for the carthe thread between the grip-device and the Work in completing each stitch as it is formed.

The slack-thread controller is located betiveen the take-up device and the threadguide. It comprises a fixed plate or rest 45 for the thread, and a movable plate or pressure-member 46 carried by a lever 47 which is pivoted at 48 to the fixed head-portion of the machine-frame, the said lever having engaged therewith one end of a contracting spiral spring -19 having the other end thereof connected with the said head-portion. The thread passes between the pressure-member l6 and the rest or backing 45, and is subjected to pressure between them, due to the action of the spring 4-9 in tending to turn the lever .47. The slack-thread controller is so disposed that the portion of thread passing therethrough draws in nearly a straight line between the adjacent roll' 36 of the threadguide and the thread-passage of the thread guide 25. It acts to hold back the portion of thread which is slackened by the giving up action of the take-up, after the taking up action has occurred, but permits the thread to pass forward under suflicient control to the stitclrforming devices as needed in the formation of a new stitch.

The thread-lock comprises a lever 50 and a bearing or rest 51 for the thread. The said lever is piv ted at 52 .upon the head portion of the machine-frame adjacent the take-up arm, and in such relation to the latter that the thread on its Way from the tension device 34 engages with the lever bcfore reaching the first of the moving take-up rolls 3G. The lever 50 is furnished with a laterally-extending threadgripping stud or projection 50*, which is carried by one arm of the lever adjacent the pivot of the latter,- the said stud or projection being arranged to co-act with the backing or rest 51 in gripping the thread at the required times. The said backing or rest is constituted by a fixed stud or projection carried by the support of the grip-lever. The thread passes between the backing or rest and the stud or projection 50 of the lever. The long arm of the lever has at its forward end a guide which engages with the thread intermediate the gripping surfaces and the first roll 36 of the take-up device, the said guide being at a somewhat greater distance from the pivot of the lever than the gripping stud or projection 50 When the taking-up action of the takeup device begins, the pull of the thread upon this arm of the lever acts with suflicient leverage and force to turn the lever around'its pivotal center so as to pinch the thread by means of stud or projection 50 against backing or rest 51.

lVhen the pull of the take-up upon the thread relaxes, the pressure of the said stud or projection is also relaxed, and the grip pend the locking of the thread while a taking-up action occurs, but have not described the same, inasmuch as it forms no part of the present invention and is claimed in the original application hereinbefore mentioned.

I claim as my invention 1. In a hook-needle sewing machine the combination with needle-actuating mechanism including a transversely-extending horizontal rockshaft, of a collar sleeved loosely on said rockshaft, a carrier-lever pivotally connected to the collar and providedwith a thread-guide, and actuating connections for said carrier-lever by which it is swung transversely with relation to the collar and the carrier-lever and collar are oscillated bodily around the rockshaft and the thread guide thereby caused to lay the I thread in the open eye of the needle.

2.'In a hook-needle sewing machine the combination with needle-actuating mechanism including a transversely -extending horizontal rockshaft, of a collar sleeved loosely on said rockshaft, a carrier-lever having an open hub-portion encirclin said collar and pivotally engaged therewith at opposite points, and provided with a threadguide, and actuating connections for said carrier-lever by which it is swung transversely with relation to the collar and the carrier-lever and collar are oscillated bodily around the rockshaft and the thread guide thereby caused to lay the thread in the open eye of the needle.

3. In a hookneedle sewing machine the combination with needle-actuating mechanism including a .transversely-extendin horizontal rockshaft, of a collar sleeve loosely on 4 said rockshaft, a carrier-lever provided with a thread-guide, oppositely located center-screws by which the carrierlever is -pivotally engaged with the collar, and actuating connections for said carrierlever by which it is swung transversely with relation to the collar and the carrier-lever and collar are oscillated bodily around the rockshaft and the thread guide thereby caused to lay the thread in the open eye of the needle.

4. In a hook-needle sewing machine the combination with needle actuating mechanism including a rockshaft, of a collar sleeved loosely on said rockshaft, a carrierlever provided with a thread-guide and pivotally engaged with said sleeve with capacity for transverse movement, means for swinging saidfirrier-lever transversely and rocking the carrier-lever and sleeve bodily to thereby cause the thread'guide to travel in the required path to lay the thread in the open eye of the needle, a carrierlever mounted upon the said rockshaft alongside said collar and provided with a threadmeasuring finger, and means to oscillate the lattptr carr er-lever around the said rocksha In testimon whereof I affix my signature in presence 0 two witnesses.

FRANK W. MERRICK. Witnesses:

NKTHAN B. DAY, EDITH A. WISEMAN.

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