US567603A - Sewing-machine - Google Patents

Description

(N0 Model.)

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(No Model.) 3 Sheets-Sheet 2.

T. A. MAGAULAY. SEWING MACHINE.

Patented Sept. 15, 1896.

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e T. A. MACAULAY.

SEWING MACHINE.

No. 567,603. l Patented Sept. 15, 1896.

TH; ncnals Enns co. PMUTDMTNQ. WASHINGTON. u. c,

rrnn l THOMAS A. MACAULAY, OF NEVVYORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE SINGER MANUFACTURING COMPANY, OF

NEIV JERSEY.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent N o. 567,603, dated September 15,' 1896. Application tiled October 5,1892. Serial No. 447.918. (No model.)

To @ZZ whom, it' may concern-.-

Beit known that I, THOMAS A. MACAULAY, of the city, county, and State of New York, 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.

My invention relates to that class of lockstitch sewing-machines in which the lower or locking threadis carried by an oscillating shuttle; and it comprises certain improvements in this class of sewing-machines, as indicated in the claims appended to this specification.

In the accompanying drawings, Figure l is a sectional side view of a sewing-machine embodying my invention. Fig. 2 is a view, partly in section through the vertical portion of the bracket-arm. Fig. 3 is a front end view of the head of the machine with the face-plate removed. Fig. 4 is a front view of the face-plate. Fig. 5 is a top view of the thread-controlling devices shown in side view in Fig. l. Fig. 6 is a partial front end view of the machine, showing the bed-plate and parts below the same. Fig. 7 is a detail view of a portion of the shuttle-operating mechanism. Fig. 8 is a detail View of the shuttle and shuttle-driver. Fig. 9 is a detail view illustrating an auxiliary thread-controlling device, and Fig. 10 is a section of the same on line 2 2 of Fig. 9.

A denotes the bed-plate of the machine, and B the bracket-arm thereof. J ournaled in the upper portion of the bracket-arm is the driving-shaft C, provided at its rear end, as usual, with the fly-wheelD and with driving-pulleys D2. `The said driving-shaft is provided at its forward end with a crank E, connected by a pitman E2 with the needlebar E2, so that said needle-bar receives its vertical reciprocating. movements from said crank. The driving-shaft C is provided near its rear endwith a crank C2, connected by a pitman F to an arm F2 of a rock-shaft G2, journaled beneath the work-plate of the machine, said arm F2 having a pin g2 engaging a slotg2 in the lever G, pivoted at G2, said lever having a second slot g, entered by a pin gl on the arm I-I at the rear end of the shuttle-operating rock-shaft H2, journaled cen--u trally of the machine in suitable hangers beneath the work-plate, and having at its forward end a driver H2 for operating the oscillating shuttle H4. The pitman F is preferably connected to the crank C2 by a cap FG, provided with a U-shaped wire spring' attached to the pitman and the cap. This construction permits the parts to be easily applied or assembled. f

Secured to the driving-shaft C is a cam C3, embraced by a feed-operating lever I, pivoted at its lower end at b to the bracket-arm B, said lever being connected by a link J to a second link J2, the lower end of which is jointed to an arm K3 of the feed-operating rock-shaft K, having at its forward end an arm K2, to which the feed-bar L, carrying the feed-dog L3, is jointed, so that said feed-bar receives its horizontal movements from the said rock-shaft. The vertical movements of the said feed-bar are imparted thereto by the rock-shaft G2, providedat its forward end with the arm L2, having a pin or roller-stud received in a slot L4 in the said feed-bar. The arm L2 is clamped to the shaft G2, so that it is axially adjustable thereon to vary the height of the feed-dog L3, as may be required.

The feed is regulated by means of a bellcrank lever, consisting of two rigidly-connected arms J 5 J G, the former of which is provided with the pin entering a slot J4 in the link J2, said link J2, together with the link J, constituting a toggle, the position of the parts of which relative to the laterally-vibrating feed-operating lever I determines the extent of rocking movements imparted to the feedoperating rock-shaft K, the said bell-crank feed-operating lever having a pivot stud or bolt s, supported by a xed lug or bracket J s inside of the vertical portion of the bracketarm B. The arm Ji of the feed-regulating bell-crank lever is threaded and screwed into the hub of the arm J5, and said arm Ji is provided with a block f, having inclined end faces for engagement with the faces of inclines B5 BG, formed on the bracket-arm B, the latter being provided with a slotted segmental porroo tion B2, outward through which the said arm JG extends, and said arm is provided at its outer end with a milled head B4, by which it may be turned, and with a nut B3, between which and the segmental portion B2 of the bracket-arm is interposed a friction-spring S2, which serves to hold said arm in any position in which it may be adjusted. By turning the screw-arm J 6 by means of its milled head B4 the block f will be caused to travel in or out relative to the inclined portions B5 BG of the bracket-arm B, thereby varying the position of the feed-regulating lever, consisting of the arms J5 J, and thus changing the position of the toggle J J2 relative to the feedoperating lever I so as to vary the vertical movements of the link J2 and thus regulate the movement of the feed-operatin g rockshaft K.

In finishing off the ends of a seam it is frequently desirable to reverse the feed, so as to sew a few stitches backward, and this can be done by simply raising the arm J of the feedregulating lever, so that the block f, which had formerly been in contact with the incline B6 of the arm B, will be brought 'in contact with the incline B5 of said arm, thus throwing the toggle over its center and causing the feeding movements of the feed-bar to be reversed, the reverse feeding movements being the same in length as the forward feeding movements in any position of adjustment of the block f relative to the inclined stops B5 B6. The feed is shortened by turning the screw-arm J6 so as to move the block finward and thereby raise said arm toward a horizontal position, in which position the feed is entirely suspended, the length of the feed being greatest when the said arm J 6 is raised or lowered to its fullest extent, and being lesser as it is brought nearer to a horizontal position, as will be readily understood by those familiar with feeding mechanisms actuated by toggles operated on the principle of the feed mechanism herein shown.

The drivin g-shaft C is provided with a cam M, which operates the take-up lever T, provided with an upward extension T2, having a thread-eye 2, serving as a pull-off, and to said extension or arm T2 is jointed by a pin or bolt T3 a push-rod U, sliding in bearings afforded by posts U2 U4, formed on the bracketarm B, the said push-rod being held forward by a spring U3, interposed between the posts U4 and a collar or pin on said rod, so as to hold the lower or shorter arm of the bellcrank lever T in contact with the cam M, the said spring U3 serving also to press the clamping tension-disks a and a2, mounted on said rod rearward of said post U4, into yielding contact with each other at proper times. Between the post U4 and the tension-disks a and a2 is a washer V, having thread-guide slots, and mounted on the post U2 is a checkweight V2, beneath which the thread runs in passing forward to the pull-off and take-up. V2 is a thread-guide pin.

Attached to the arm B is the bracket 3, which supports the spool-pins 4 5. The spoolpin 4 has a tapered forward portion 4, fitting in a tapered hole formed in the rear split end of the spool-pin 5, so that said pins can be readily secured in the socket at the upper end of the bracket 3 by inserting one into the other, and thus forcing the split sleeve at the rear end of the spool-pin 5 outward against the inner wall of said socket, so that said pins are thus held in place by outward pressure. The spool-pin 5 is provided at its forward end with a disk d, over which the thread running from the spool held by said pin passes.

Cooperating with the pull-olf andthe intermittent tension I preferably employ an auxiliary take-up or thread-controller consisting of a lever 8, pivoted to the face-plate and provid ed with an inclined upper portion against which a pin 7, carried by the needle-bar, engages at proper times, said lever being held in position to be engaged by said pin by a spring 12. The face-plate is provided with a thread-guide 9, and below said thread-guide is a slot 10, in which the lower or operating end of the auxiliary take-up or thread-controller works, the lower arm of the said takeup or controller being provided with an incline which is engaged by a pin Il, carried by the presser-bar, and which pin serves to limit the movement of the said lever under the action of the spring l2. The height of the said pin 1l is governed by the thickness of the work beneath the presser-foot, so that when the work is thick the said auxiliary take-up or controller 8 will be held in such position that the incline at the upper end thereof will be engaged later in the upward movement of the needle-bar than when the work is thin, and thus more slack will be drawn up by said take-up or controller when the work is thin than when it is thick.

Instead of using the auxiliary take-up or thread-controllin g mechanism just described, and which is more clearly shown in Fig. 4, I might use the modified form of thread-controlling mechanism shown in Figs. 9 and l0, in which the presser-bar is shown as being provided with an arm or cross-bar h, carrying the thread-clamping spring e, having an arm t to be engaged by inclines on the needlebar E2 to force the said thread-clamping spring c, between which and the cross-bar h the thread runs, away from said bar at proper times. As the vertical position of the arm h, attached to the presser-bar, will be governed by the thickness of the work beneath the presser-foot, it is obvious that the thread pressed upon by the spring c will be released earlier orlaterin the movement of t-he needlebar according to the thickness of the work beneath the presser-foot, so that the thread may always be left free or be slackened just as the needle is entering the work.

In the operation of my machine the thread will run from one of the thread-spools to the thread-guide V2, thence between the thread- IOO IIO

clamping disks a and a2, and through a slot in the thread-guide washer V, and then beneath the check-weight V2, to the eye 2 in the pull-off arm T2, and thence forward over the thread guide at the top of the face -plate shown in Fig. I downward to the thread-guide 9, upward to the take-'up leverT, and thence downward through the eye at the lower end of the auxiliary take-u p or thread-controller 8 to the needle. When the take-up lever is performing the last part of its upward movement and the stitch has been tightened, the rod U will be forced backward by the upward extension T2 of the take-up lever, releasing the clamping tension-disks a and a2 from contact with each other and thus permitting the take-up to draw thread from the thread-spool, while in the downward movement of the takeup lever the thread-eye 2 at the upper end of the extension T2 of the take-up lever' may also act as a pull-off to draw thread from the thread-spool and through the tension-disks, if enough slack thread has not already been supplied.

The shuttle-operating mechanism herein described comprises two vibrating or rocking partsto wit, the arm F2 of the rock-shaft G3 and the slotted lever G-whioh'are interposed between the pitman F, operated from the crank C2, and the rock-shaft H2, by which the shuttle is oscillated. From this construction it is apparent that I am enabled to im.- part an oscillating movement in a large arc to the rockingshuttle-operating shaft from a rotating crank on the driving-shaft which is arranged centrally ofthe machine, and the shut tle can therefore be operated to cause it to pass quickly through the loops of needlethread, and there will still remain ample time in the rotation of the driving-shaft for the operation of the feed and take-up.

Having thus described my invention, I claim and desire to secure by Letters Patentl. In a sewingmachine, the combination with the driving-shaft G arranged centrally of the machine and provided with the crank C2 near its rear end and a needle-bar operatively connected to the forward end of said driving-shaft, of the rock-shaft G2 provided with the arm F2, the pitman F connecting said crank with said arm, the lever G provided with slots in its opposite sides, a pin g2 carried by said arm F2 and entering one of said slots and a shuttle-driving rock-shaft arranged centrally of the machine and having an arm I-I provided with a pin, as g4, also entering the other slot in the said lever G.

2. In a sewing-machine, the combination with the driving-shaft C provided near its rear end with a crank C2, of the needlebar operatively connected with the forward end of the said shaft, the feed-lifting rock-shaft G2 having at its rear end the arm F2 provided with the pin g2, and at its forward end the arm L2 provided with a pin or roller-stud, the pitman F connecting the said crank C2 with ,eos Y a the said arm F2, the lever G provided with the slots g and g2, the latter entered by the said pin g2, the shuttle-driving rock-shaft H2 provided with the arm 7L having a pin g3 entering the said slot g, the feed-bar L provided with a slot entered by the pin or roller-stud carried by the said arm L2, and means for imparting backward and forward movements to the said feed-bar.

In a sewing-machine, the combination with the driving-shaft C provided with the cam C2, of the feed-operating lever I having a-yoke embracing said cam, the feed-operatin grock-shaft K provided at its rear end with an arm K3, the links J and J2 connecting said feed-operating lever with said arm K2, said link J2 being provided with a slot, as J 2, and the 'feed-regulating bell-crank lever consisting of the arms J5 and J6, the former provided with a pin or stud entering the said.

slot J 4 in the said link J2, the feed-bar L connected to the forward end of the said rockshaft K, to be moved back and forth thereby, and means for raising and lowering the .said feed-bar. l

4. In a sewing-machine, the combination with the driving-shaft C provided with the cam C2, of the feed-operating lever I having' a yoke embracing said cam, the feed-operate ing rock-shaft K provided at its rear end with an arm K3, the links J and J2 connecting said feed-operating lever with said arm K2, said link J2 being provided with a slot, as J 4, and the feed-regulating bell-crank lever consisting of the arms J5 and J6, the former provided with a pin or stud entering the said slot J 1 in the said link J2, the feed-bar L connected to the forward end of the said rockshaft K, to be moved back and forth thereby, the feed-lifting rock-shaft G2 provided with the arms F2 and L2, the latter having a pin or roller-stud engaging a slot in the said feedbar, to raise and lower the same, and means for operating the said feed-lifting rock-shaft from the said driving-shaft.

5. In a sewing-machine, the combination with the driving-shaft thereof provided witha cam, as G2, of the feed-operating lever I having a yoke embracing said cam, the feedoperating rock-shaft K provided with the arms K3 and K2, the links J and J2 connecting said feed-operating lever with the said arm K2, the feed-bar L connected with the said arm K2 to be moved back and forth thereby, the feed-regulating bell-crank lever consisting of the arms J 5 and J 6, the former of which is connected' with the said link J2 and the latter of whichV is threaded, the bracket-arm B provided with the inclines B5 and B6 and with the curved portion B2, the block f having inclined faces to engage with the said inclines, and threaded to embrace the threaded portion of the said arm J 6, a nut, as B3, on the said arm J G, a friction-spring interposed between the said nut and the said curved portion B2, the feed-lifting rock-shaft G2 operatively connected to the said feed-bar to raise IOO IIO

and lower the same, and means for operating said feed-1iftingI rook-shaft.

(5. In L sewing-machine, the combination with the drivin g-shztit thereof, provided With zt cam, its M, and t stitch-forming in eohztnisni operated from said drivin y-shaft, of the takeup lever T operated by said ezmi and provided with the extension T2, the push-rod U connected with the said extension T2 to be operated thereby, suitable bearings in which said push-rod een slide, tension-disks mounted on said push-rod, and a. spring, on said push-rod, for holding said disks in yielding Contact with each other.

7. In a sewing-machine, the combination with the driving-shaft thereof provided With 2t Cam, as M, and a stiteh-forming mechanism operated from said driving-shaft, of the take up lever T operated by said @am and provided with the extension T2 having the piilhoff thread-eye 2, the pushrod U connected with the sztid extension T2 to be operated thereby, suitable bearings :in which said push-rod een slide,tensiondisks mounted on said push-rod, and a spring, on said push-rod, for holding` said disks in yielding Contact with each other.

S. In zt sewing-machine, the Combination With zt standard as 3 having a socket, of a spool-pin 5 tting into said socket and detachable therefrom, said pin being bored and split at one end, and am auxiliary spool-pin 4r one end having t tapered portion, as 4f, entering;` the end of said detachable pin to expand it and fix it in said soeket, substantially as set forth.

THOS. A. MAGAULAY.

Witnesses:

M. E. GORDINNIER, A. L. AUSTIN.

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