US1084223A - Sewing-machine. - Google Patents

Description

G. E. MOLYNEUX.

SEWING MACHINE.

APPLICATION FILED 111111.23, 1911.

1,084,223. Patented Jan. 13,1914.

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G. E. MOLYNEUX.

. SEWING MAGHINBI APPLICATION FILED AUG. 23, 1911.

1,084,223. Panam-,ed Jan. 13, 1914.

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GEORGE E. MOLYNEUX, OF BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A, CORPOSJATIION OF NEW JERSEY.

SEWING-MACHINE.

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To @ZZ whom t may concern.'

Be it known that I, GEORGE E. Monr- Nnnx, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its primary object to provide a mechanism in which the needle bar may have a minimum length of stroke, to permit of the employment of a short needle and which shall provide ample time for the setting of each stitch and the feed of the work between stitches.

lt has for its further object to provide a chain-stitch looper mechanism adapted for effective cooperation with the needle mechanism so actuated in the production of stitches.

According to the present invention, the needle-mechanism comprises a rock-shaft j ournaled in the bracket-arm and carrying a crank which is connected by means of a pitman with the needle-bar; said rock-shaft having an operative connection wit-h the rotary main shaft whereby its crank is reciprocated through an angle of which'the greater portion lies above a line extending through the axis of said rock-shaft and at right angles to the needle-bar. While the needle-mechanism, so described, is not limited to association with any particular type of loop-taker, it is preferably employed in combination with an endwise-movable chainstitch looper provided with actuating means for imparting thereto loop-seizing and loopshedding movements with a dwell at the completion of its loop-seizing movement during the period of retarded movement of the needle in approaching and receding from extreme upper position. 1n the most approved construction of the machine, the looper mechanism is actuated by an operative connection with the needle-operating rock-shaft.

In the accompanying drawings, Figure 1 is a sectional front side elevation of a sewing machine constructed in accordance with the present invention, and substantially as represented in my pending application, Serial No. 5288017 filed October 9, 1909, and

Specification of Letters Patent.

Application filed August 23, 1911.

rammed aan. is, 1914. Serial No. 645,611.

Fig. 2 is a rear end elevation of the same with the base and hollow standard of the bracket-arm in section in order to show the parts inclosed therein. Fig. 3 is a front end elevation of the machine with the forward end of the work-supporting arm in section and the face-plate of the bracket-arm removed. F ig. 4 is a front elevation of the needle-mechanism detached from the machine, and Fig. 5 a similar view of the operating means for the needle-actuating rockshaft. Fig. G is a plan of a portion of the feed-actuating mechanism.

The frame of the machine is shown formed with the hollow base l and standard 2, the overhanging bracket-arm 3 and the worksupporting arm 4 having its flange 5 secured by screws 6 to the base beneath the bracket-arm. The standard is provided at the rear end with a bearing boss 7 containing the bushing 8 in which is `iournaled the rear end of the main shaft 9 fitted within a bearing member 10 formed upon the rearward end of the work-supporting arm 4. The reduced forward portion 9X of t-he main shaft is journaled in a bearing boss 11 near the forward end of the arm 4.

The bracket-arm is provided at its rearward end with a bearing boss 12 in which is `iournaled the rearward end of the needleactuating rock-shaft 13 whose forward end is fitted to and passes through the bearing member 14 in the hollow head 3X of the bracket-arm, where it is provided with the crank-arm 15 carrying the pin 16 embraced by one end of a pitman 17 whose other end embraces a lateral pin 18 upon the collar 19 fixed upon the needle bar 20 which is shown herein carrying the spaced eye-pointed needles 21. Upon the rearward end of t-he rock-shaft 13 is fixed the lateral crank-arm 22 which carries the stud-screw 23 embraced by the upper end of a pitman 24 whose lower end embraces a crank J5 formed in the main shaft 9 and adapted to communicate through the described actuating mechanism reciprocating movements to the needle-bar and needles.

As represented more particularly in Fig. 4. the crank-arms 15 and 22 are arranged in acute-angular relation and upon the same side of the rock-shaft 13. Thus, the crankarm 15 is so set upon the rock-shaft 13, and

the operative. connection between the latter and the driving shaft is such, t-hat said crank-arm performs its reciprocatory operative movements througn an angle which is disposed mainly above a line extending through the axis of the rock-shaft and perpendicular to the direction of reciprocation of the needle-bar, as indicated by the full and dotted line representations of the crankarm respectively in extreme lower and upper positions in Fig. 3. In other words, the crank-arm 15 is so positioned on the needlebar actuating rock-shaft that in its mean position, equi-distant from and between the extreme positions represented in Fig. 3, it is in acute-angular relation'with the needlebar. rhis crank-arm is thus positioned upon the needle-bar actuating rock-shaft in such manner that in the operative movements of the latter it assumes in its opposite extreme positions dierent angles, or different degrees of inclination with the needle-bar; being in its lower extreme position nearly at right angles thereto and in its upper position at a much more acute angle with the saine. By this means, the needlebar is given rapid movements in its approach to and recession from lower position and a corresjiionding quick reversal of movement at such point; while in the approach to and recession from upper position, the needle-bar receives respectively a retarded and then an accelerated movement with an intermediate slow reversal from rising to descending movement.

The needle-actuating rock-shaft 13 has fixed upon its rearward end, at the side of the bearing boss l2 opposite the crank-arm 22, a second lateral crank-arm 2G carrying a screw-stud 27 embraced by the upper end of the pitman-rod 2S whose lower end embraces a screw-stud 29 intermediate the ends or" a vibrating lever 30 having one end ournaled upon the fixed fulcrum-pin 3l mounted in an inwardly projecting boss 32 formed upon the base l. The outer end of the lever 30 carries a screw-pin 33 connected by means of a. link 3e with a similar pin 35 carried by a crank-arm 36 fixed upon the rearward end of the looper rock-shaft 37.

The component members of the operative connections between the needle-actuating and looper rock-shafts are so arranged and proportioned that the rocking of the former through its cranl-and-pitman connections with the actuating crank 25 of the main shaft causes the screw-pin 33 to move into and out of alinement with the fulcrum-pin 3l and crank-pin 35 of the crank-arm 36 in imparting to the needle each complete reciprocation, whereby the looper rock-shaft receives a dwell in the production of each stitch as the needles attain their highest position and begin their descent for the succeeding stitch. lt will be observed that the members 30 and 3e form a toggle-device in the connection between the needle-actuating rock-shaft i3 and the looper rock-shaft 37 by means of which the described dwell in the looper move-ments is produced.

The looper rock-shaft 37 is journaled at its rearward end in the bearing member 10 and at its forward end in the bearing member 38 within the arm d and parallel with the main shaft, and has secured upon its forward end the collar 39 with forwardly projecting stud 40, of angular cross-section, upon which is pivotally mounted by means of a transverse fulcrum-pin eil the rocking iooper-carrier l2 in whose upper end is secured the shank of the eyed looper d3. The lower portion del of the looper-carrier is split and formed with the segmental race which is entered by a slide-block 45 having a balland-socket connection with an upwardly projecting pin i6 carried by a forwardly projecting arm et? fixed upon one end of the reciprocating rod i3 journaled for reciprocation within the bearing member 38 beneath the looper rock-shaft 37. As shown and described more fully in my pending application, Serial No. 545,345, filed February 23, 1910, the rod 4S is disposed slightly out of alinement with the main-shaft, and is connected by means of a gyratory pitman e9 with a crank-cisk 50 upon said shaft, from which the rod i3 derives endwise ogging movements which are communicated to the looper-carrier which is thus given a slight rocking movement upon its fulcrumpin eti to impart sidewise or needle-avoiding movements to the looper-blade in addition to the endwise loop-seizing and loop-shedding movements derived from the oscillatory movements of the supporting rock-shaft 37.

rdjacent the crank 25, the main shaft carries the feed-actuating eccentric 5l which is embraced by the strap 52 of an eccentricrod 53 whose opposite end embraces a ballstud 54 upon the rearwardly extending arm 55 of a plural-armed rocker mounted upon the fixed fulcrum-stud 56, carried by the lug 57 extending inwardly from the wall of the base l, and having a second laterally extending arm 53 carrying a ball-stud 59 embraced by a strap 60 at the rearward end of the feed-bar 6l which extends longitudinally through the work-supporting arm 4 above the rock-shaft 37 and is formed near its forward end with the reduced cylindrical portion 62 to which is secured the slide-block 63 channeled in its upper side to receive the shank 64 of the serrated feed-dog 65 adjustably secured thereon. The bearing niembe1 38 of the arm eiis notched in its upper side in a manner well known to form a longitudinal slideway for the slide-block 63.

To the reduced portion of the feed bar G1 is slidingly itted a tilting bearingor fulcrum-block 65 pivotally supported by means of stud-screw G6 within the upper end of an upright lifting-bar or post G? formed at its lower end with a perforated boss 68 which embra es the feed-lifting eccentric G9 iixed upon the reduced forward portion 9X oi' the main shaft adjacent the crank-disk 50.

rljhe longitudinal reciprocating movement of the feed-bar for eiiiecting the advance of the work by the work-supporting arm oit the machine toward the standard-2 is produced through its described connections with the feed-actuating eccentric 5l while the rising and falling movements ot' the feed-dog are produced by the toed-lifting eccentric (39 through the post (i7 and bearing -block swiveled therein.

fis represented in the drawings, the feedactua'ting eccentric is set upon the mainshaft slightly in advance oi the needleactuating crank 25 and, through the described connections with the feed-dog, operates to advance the work while the needles are on the dwell at the upper extremity of their stroke.

Cooperating with the feed-dog 65 is the presser-toot ZO whose shank 71 is rigidly secured to the lower end of the presser-bar 72 journaled within the head 8X of the bracketarm and pressed downwardly by means of the spring` 73 having one end resting upon a lug 2X of the standard 2 and the other end resting upon the lug lli of a collar 75 fixed upon the presser-bar, the spring being forced downwardly by engagement with the head 7G of the screw 77 tapped into the arm 3.

Fixed upon the presser-bar above the collar Z5 is a second collar 7S having a lateral arm 79 to which is pivotally connected the lower end of the rod 80 whose upper end is pivotally attached to one end ot a rock-lever 8l ulcrumed intermediate its ends by means of a screw 82 upon a stud 83 adjustably secured upon the head of the bracket-arm. The opposite end ot the rock-lever is formed with a thread aperture Sli. The needle-bar carries at its upper end a washer S5 with a laterally projecting finger 86 provided with suitable upper-thread guideeyes, and in advance thereof is disposed the iiXed upwardly extending thread-guiding arm 87 secured adjustably upon the bracket-arm head and having atits upper extremity the lateral lip 88 and the guide-eyes 89. The arm 87 is formed with an upwardly extending branch 90 forming with the same a notch entered by the free end of the check-spring` 9i whose shank 92 is adjustably secured upon the bracket-arm head by means of the screw In threading the machine, the needlethreads a are led from the source or" supply through the eye of the guide-washer 9d and through the tension devices 95 and thence through the eye 84 of the rock-lever 8l from which they pass through the eyes of Vthe thread-finger 86 beneath the check-spring arm 91 and through the eyes 89 of the thread-guiding arm S7 from which they pass downwardly to the needle-eyes,

In the operation of the machine, the reciprocation oi the thread-finger 8G with the needle-bar, working between the relatively stationary thread-guiding members 8l and 8'?, causes an initial slackening and a subsequent pull upon the needle-thread as the needles descend from highest to lowest position, with a corresponding` action as the needles return to eXtreme upper position. As the needles begin to rise from their lowest position to present their loops to lthe looper7 the needle-threads are slackened for entrance of the looper, but as the needle-bar caches its highest position the needlethreads are tightened so as to draw through the tensions sutiicient needle-thread for the succeeding stitch-formation. In the subsequent descent of the needles to their lowest position the thread-finger 8G operates to set the stitches formed in the previous stitchforming cycle.

From the foregoing description it will be seen that the described setting of the crankarm l5 upon the needle-actuating rock-shaft 13 relatively to the connections oi' the latter with the actuating crank 25 upon the mainshaft provides for thc communication o a short stroke to the needle-bar suitable for giving ample time for the feeding action while permitting the use oit' a short needle, thereby increasing the precision of action oi the mechanism, reducing the liability ot heating of the needle when stitching closetextured fabrics, and greatly reducing the noise and wear of the parts when operating at the high speeds at which this class of machine is commonly driven.

It is evident that the present needle mechanism is not limited to the speciiic construction nor to association with the looper mechanism herein shown and described, the essential feature of the present improvement being the connection of the needle-bar with its actuating rock-shaft and the actuation of the latter in such manner that the reversal of the reciprocatory movements of the needle-bar is slower at the upper than at the lower end of its stroke.

Having thus set forth the nature of the invention, what I claim is l. ln a sewing machine, the combination with a needle-actuating rock-shaft, means for imparting thereto operative movements, and a reciprocating needle-bar carrying a needle, of a pitman connected at one end to said needle-bar, and a crank-arm connected. with the other end of said pitman and so secured in position upon said rock-shaft that it assumes in its opposite eXtreme positions different angles with the needle-bar, whereby the reversal of its movement in upper eXtreme position is performed at a i-OU slower speed than in opposite extreme position and a longer dwell of the needle above the work than below the same is produced.

2. In a sewing machine, in combination, a rotary driving-shaft carrying an actuating element, a needle-actuating rock-shaft arranged above the same and carrying a crankarm, a pitman connection between said actuating element and said crank-arm, a reciprocating needle-bar carrying a needle, a second crank-arm upon said rock-shaft arranged to assume a mean position at an acute angie with the needle-bar, a pitman connection between the second-named crankarm and the needle-bar, a loop-taker, and actuating mechanism therefor constructed and arranged to impart to the loop-taker a quick reversal of movement in retracted position and a dwell at the completion of its loopseizing movement and while the needle is in the upper portion of its traverse.

3. ln a sewing machine, in combination, a rot ry driving-shaft carrying an actuating element, a needle-actuating rock-shaft arranged above the same and carrying a crankarm, a pitman connection between said actuating element and said crank-arm, a reciprocating needle-bar carrying a needle, a second crank-arm upon said rock-shaft arranged to assume a mean position at an acute angle with the needle-bar, a pitman connection between the second-named crankarm and the needle-bar, a loop-taker, and actuating mechanism therefor operativelyT connected with said rock-shaft and constructed and arranged to impart to the looptaker a quick reversal of movementrin retracted position and a dwell at the completion of its loop-seizing movement and while the needle is in the upper portion of its traverse.

e. In a. sewing machine, the combination with a rotary driving vshaft and stitch-forming mechanism comprising a reciprocating needle-bar carrying a needle and an osciliating looper cooperating with said needle, of a rock-shaft, actuating means for said rock-shaft connected with the driving shaft, a crank-arm fixed upon said rock-shaft to move within an angle disposed mainly above the axis of said rock-shaft, a pitman connection between said crank-arm and the needle-bar, a supporting rock-shaft upon which the looper is mounted, a crank arm upon the looper-supporting rock-shaft, and an operative connection, including a toggledevice, between said crank arm of the loopersupporting rock-shaft and the needle-actuating rock-shaft whereby the looper receives a dwell in its advance position while the needle-movement is retarded in the upper portion of the traverse of the needle.

ln testimony whereof, l have signed my name to this specification, in the presence or" two subscribing witnesses.

GEORGE E. MOLYNETVKv Witnesses D. B. Bienne, W. P. STEWART.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of 'Patents Washington, D. C.

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