USRE9933E - schwalbach - Google Patents

Description

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M. SCHWALBAOH,

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Assignor to T. A. MAGAULAY. SEWING MACHINE. No. 9,933.

Reissued Nov. 15,1881.

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M SGHWALBACHI 3 sheets-sheep 3.

Assignor to T. A. MAGAULAY. SEWING MACHINE.

No. 9,933. Reissue@ Nov. 15,1881.

C) l C 4is a detailed view of the shuttle-carrier.

lUNITED ,STATES PATENT OFFICE..

MATI-IIASSOHWALBAOH, OF MILWAUKEE, WISCONSIN, ASSGNOR TO THOMAS A. MAOAULAY, OF NEW YORK, N. Y. i

SEWING-MACHINE.

SPECIFICATION forming part of Ressued Letters Patent No. 9,933, dated.` November 15, 1.881,

Original No. 56,805, dated July 31, 1866. Application for reissue tiled June 29, 1881. p

To all whom t may concern:

Be it known that I Marinas SoiiwALBAci-I, of Milwaukee, Milwaukee county, State of Wisconsin, have invented a new and useful Improvementin Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l, Sheet 1, is a front elevation of a sewing-machine niade according to my invention. Fig. 2 is a detailed side view of the needle-bar and other parts adjacentto it. Fig. 3 Fig. 4, Sheet 2, is a detailed front View of the feeding devices and shuttle-carrier. Figs. 5 and 6 Iare additional Views, showing different positions of the needle-bar and parts adjacent to it. Fig. 7, Sheet 3, is an under-side view ofthe niachine. Fig. 8 shows the clanip which holds the needle to its bar. Fig. 9 is a detailed View of the inside of plate V.

'Similarletters of reference indicate like parts.

One feature of my invention is that the counections of the shuttle and needle-shafts with the driving-shaft are so made and arranged that the pulley may be turned in either direction without stopping the operation of the needle or breaking the thread. The needle-bar is operated in an upright slide by a lever attached to the needle-shaft, and carries a tension-rod that regulates the supplyr and tension of the thread. The shuttle is carried in a socket formed in the upper end of a vibrating lever, hereinafter more particularly described. The feeding devices are vmade and operated in a novel way, and the needle is secured to the needle-bar by a block which is held to the bar by a set-screw.

The letter A designates the cloth-bed of a sewing-machine supported on legs of a proper height. l

B is the driving-shaft, .carrying a drivingpulley, O, at its rear end, and at its front end having a crank, D, which is connected by a rod or link, E, with a crank, F, or rocking arm keyed to the lower or shuttle shaft, G. rlhis shaft G has bearings in pieces L, which hang down from the table A at or near the ends of the machine.

The letter e designates the upper or needle shaft, which is journaled in brackets l, (one of which is seen in Fig, 1,) that project from the usual ri ght-an gled arm or standard, m. Motion is communicated to shaft e from shaft G by a crank, t, on the back end of the latter shaft, which crank is connected by the rod j with a crank, u, iixed on the shaft. These parts are seen partly in dotted outline in Fig. l.

bis a vertical needle-bar, which slides in a groove made for it in the guide-plate p, fixed in the forward end of the standard '111.

Between the plates and the end of the arm is an opening, }to receive a vibrating arm,f, extending from the needle-shaft. The end of said arm passes between lugs y g, which project into the opening q from the needle-bar. The rocking of the shaft e causes its arm f to vibrate in the opening q, and to carry the needle-bar up and down the proper distance. The top of the needle-bar carries a pin, c, which is free to rotate in its bearing. The head ofthe pin is perforated to receive a take-up rod, d, which is fastened to the pin by a set-screw. That end of the rod which extends toward the front has a hole through which the thread goes on its way to the needle. The other end of the rod goes through the head of a like pin, c', which is supported by a standard, o, and is also free to turn in its bearings. When the needle-bar is .carried upward the forward end of the tension-rod is carried up with it, and its rear end is depressed, being held in the head ofthe hinder pin, c', which, as well as the pin in the needle-bar, is free to turn to permit this change of position of the rod and needle-bar. When the needle-bar is brought down the tension-bar is brought substantially to the position seen in Fig. 5. Thus it is seen that the tension-rod is made to vibrate on the hinder pin, c', as upon apivot, andis also free to slide to and fro in it as the-needle-bar makes its reciprocations.

y The needle is held against the front of the needle-bar in a shallow groove by means of a clamp, b', of peculiar construction. `(Shown in detailed view in Fig. 8.) The clamp is threesided, its adjacent sides being at right angles ICO i Y is pushed downward until its handle rests holds the clamp without removing the clamp itself. The adjustment is therefore easily accomplished.

vThe presser-foot W extends from the end of the bar X, which is raised by a spiral spring,

a, which rests on the plate p and presses upward against a pin, s, that is fixed in the top of said bar X. The presser-foot and its bar are brought down by means of a right-angled lever, Y, pivoted to the face of plate p, and connected4 to the presser-bar X by a spiral spring, Z, one end of which is fastened to the pin s and the other end tothe lever, at the an gie which is nearest to the fulcrum of said lever. The handle of the lever extends from it at a right angle, and is curved outward near its end, and is made ofsuflicient length to allow it, when brought down t'o its' lowest position, to rest against a stop, t, that projects from the face of plate p. When it is desired to bring the presser-foot down against the feeding-dog the lever against the stop t, at which time the lower end of that part of the lever which is pivoted to thc platep is to 'the left of a vertical line that intersects the pin s, so that the lever will rernain stationary, its spring Z meanwhile h old-L ing the presser-bar down with an elastic force.

The stop tis in the same plane as the needle, or near thereto, and has a vertical hole through it to serve as a thread-guide. A light spiral spring, a, is placed V'around it, which is allowed to hear against the thread and push it outward. When a pull is madeon the thread on the descent of the needle the spring is forced backward toward the plate 19 by the tension made on the thread, and when the needle rises the spring a serves to take up some of the slack thread which is then found above the and arm P.

needle. The crank D makes a complete revolution around its shaft, but the' cranks F t' of shaft G and crank n of shaft c are only partially rotated, so as to make their shafts rock Vfar enough to produce the requisite reciprocations of the needle and shuttle-carrier, which is constructed with the ,driving-horns n and n2, as ,shown in Fig.- 3. rlhe shnttleis carried in asocket made in the top or end of a vibrating lever or shuttle carrier, K, which is pivoted to the lower end of the forward hanging piece, L, and is oscillated by the oscillating movement ofthe shuttle-shaf t G, impart-ed from the main shaft through the link E, crank D,V

for connecting the vibrating'shuttle-lever with the shuttle-shaft is the crank H, which, by its pin I, yworks in a straight slot, J, of the shuttie-carrier K. 4

The particular instrumentality The feeding-dog T works up througha slot in the table, being formed on the upper-side of a sliding feed-plate, R, which rests and slides in a horizontal position over a shelf, c", Figs. 7 and 9, attached to the shuttle-carrier. The feed-plate R is supported in position by the aid of a plate, V, which is screwed to the for-k ward edge of the shelf c", so as to inclose the feed-plate R between the plateV and the side of a curtain, U, which hangs down from the under side of the table A, alongthe front edge of the transverse slot in which the shuttle makes its reciprocations. The back or inner side of the curtain coincides with the front edge of said slot, and is the surface along and against which the shuttle-carrier and shuttle move.A The plate V also serves to keep the shuttle-carrier and shuttle close up against the inner side of the curtain when the screw or screws which attach it to the carrier are tightcned so as to bring the plate R close up to the outer side of the curtain U. The' plate V is' Yalso connected to the carrier by a pin. (Shown in dotted outline in Fig. l.) .The upper-lefthand corner of the plate V has a cam-pin, e',

projecting a little'way from its inner side, for` the purpose of lifting and holding up the feed bar or plate R when the carrierhas been moved toward the base ofthe feed-plate, and the feedvplate continues to be held up by the cam-pin c vduring its'forward-feeding motion andnntil such pin moves from under the stitch-plate to the left. By this means the lifting and supporting of the feed-plate during its forward movement is ei'ected by the pin e', which de- IOO pends forits movement on the shuttle-carrying Y mechanism.

The feed-plate R has a slot, S, at its righthand, end, which receives a pin or screw that is fixed' in the curtain U. This pin or screw sustains that end of plate R, and the slot'allows the plate to move to and fro. The movement of the feed-plate toward the right is controlled by an adjusting-screw, Q, that passes through the top of a lever, N, which is pivoted at its fulcrum to a bracket, M.

The means for imparting movement tothe IIS lever N are as follows: The lower end of said lever is divided into two curved branches, the lower one of which, P, is short, and the upper one, O, is long. The curve of the latter is concentric with the are described by the pin l of crank H, which moves4 the shuttle-carrier. The pin I projects through the slot of the carrier and beyond the plane ot the branches, being below the upper one thereof'. vThen the pin I is moved toward the right it strikes the inside of the lower branch, P, and, bearing it downward, causes the lever N to 'vibrate onits fulcrurn and bring the end of screw Q against the end of the feed-plate,` and thus the feedingdog T is moved forward to feed the material that is being sewed. The return movement of pin I relieves the branch P, when the lever N begins to fall down toward the position given it in Fig. 4. The pin 1,'on completing its movement toward the left, allows the lever N to IOS drop to its lowest position, away from the feedl plate. At that time, also, the feed-plate is allowed to fall down to its lowest position, so as to bring the feeding-dog T below the level of the cloth-table, the left-hand end ot' the feedplate R being beveled or inclined to allow it to fall rapidly when the carrier, with plate V, is moved oftto the left. The inner face of the plate V has a ledge, F, (see Fig. 9,) on which the edge of the feed-plate R slides, and in which, in connection with pin e', it is supported during the vibrations of the carrier and plate V. The feed-plate is carried toward the right, to be in readiness for a new feed-movement, by means of frictional contact with the plate V. When the shuttle-carrier is completing its movement toward the right the feed -plate is also raised, so as to bring its dog T above the cloth-bed, and when the crank-pin I strikes the smaller branch, P, of the feed-lever N the feed takes place. i

It will be observed that the direction of the feed is not changed by a change in the direction of rotation of the driving-pulley.

The connection ofthe upper and lower shafts with each other, and the connection of the driving-shaft with the lo wer shaft, are such as that the two first-named shafts are rocked as far when the driving-pulley is revolved toward the left as 'when it is revolved toward the right, and consequently the needle and shuttle are moved in both cases the same distances in the same periods of time. The feed-being eected through the crank-pin l and the shuttle-carrier, the order of the movementsiof the feeding devices is always the same, so that it is immaterial, in starting the machine,whether the motion ot' the driving-Imlley is toward the right orleft.

The supply of thread for the needle is effected through thetake-up and tension-rod tl,which, being fast at the top of the needle-bar, is made to rise and fall with it, so far as the front part ofthe rod is concerned, while its rear portion vibrates about the top of the standard r. The rod consequently is made to incline first forward and then backward, its forward inclination taking place when the needle is descending, so as to give at that time a full supply of thread, and its backward inclination taking place when the needle is rising, so as to take up the slack thread. The thread is wound about the rod back of its eye in its forward end to produce tension on the thread. The revolvingpivots c c', through which the rod is passed, permit the easy vibration of the rod, which slides through the head of the hinder pivot or pin, c.

The described arrangement is such that the shuttle is in a better position to take the loop of the needle-thread than if it moved in a horizontal plane, because the nose of the shuttle will be directed upward when it reaches the place of the needle.

I claim as new in sewing-machines, and desire to secure by Letters Patentl. The combination of the elbow feeding-lever N, carrying an adjustable feed-propellin g screw at its upper end, and having curved branches 0 P on its lowerend, between which the pin I vibrates, substantially as set forth.

2. The combination ofthe following elements: the shuttle-carrier having the cam-pin e', the feeding-plate R, and the elbow-lever N, the whole operating together substantially as described.

3. The combination ofthe following elements: first, the plate V, constructed substantially as above described; second, the shuttle-carrier; and, third, the feed-plate R, the same being arranged substantially as described, and formoving the feed-plate backwardwhen it is in its lowest position.

4. The combination, in asewing-machine, of the following elements: first, a main drivingshaft; second, a shuttle-driving shaft oscillated from the main shaft by a rod and crank; third, an oscillating shuttle-carrier; fourth, a feed-plate; fifth, a cam-pin, e', for lifting and holding up the feed during the forward movement ofthe shuttle-carrier, substantially as described.

5. The combination, in a sewing-machine, of the following elements: first, a main drivingshaft; second, a shuttle-driving shaft oscillated from the main shaft; third, an oscillating shuttle-carrier; fourth, a feed-plate; fifth, a lever pivoted to a fixed fulcrum, one end of which is rocked by connections from the main shaft, and the other end of which operates to advance the feed 5 sixth, a cam-pin, c', which lifts and holds up the feed during the forward movement of the shuttle-carrier, substantially as described.

6. In combination with an oscillating shuttle-carrier, a rotary driving-shaft, an intermediate rock-shaft, a crank-arm on the drivingshaft, an arm on the rock-shaft connected by `a rod with the/said crank, and an arm on the rock-shaft connected directly with said pivoted shuttle-carrier, all arranged in the described relation, to operate substantially as specified.

7. The combination of the driving-shaft B, the oscillating pivoted shuttlecarrier, the crank-arms H and F on the rock-shaft G, the rod'E, and crank on the shaft B, substantially as set forth.

8. The combination of the driving-shaft B, feed-plate R, elbow-lever N, screw Q, crankarms H F on the shaft G, rod E, and crank D,'for the uses and purposes substantially as described.

MATHIAs soHwALBAcH.

Witnesses:

C. H. SCHMIDT, t I GNATZ FRIEDREICH.

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