US312467A - hawthorne - Google Patents

Description

(No Model.) 4 Sheets-Sheet 1.

R. H. HAWTHORNE.

SEWING MACHINE.

No. 312,467. Pantedfebp17y1885.'

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\ R. H. HAWTHORNE.

SEWING MACHINE.

No. 312,467. Patented Feb. 17, 1885.

\No Modvel.) l i 4 Sheets-Sheet 3. R. H. HAWTHORNE.

` SEWING MACHINE.- y No. 312,467. Patented Feb. 17, 1885.

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(Normaal.) 4.sheets-Smm 4 R. H. HAWTHORNE. SEWING MACHINE. No. 312,467. .Patented Peb. 17, 1885.

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SPECIFICATION forming part of Letters Patent No. 312,467, dated February 17, 1885.

Application filed February 6, 1884. (No model.) Y

T0 all whom it may concern:

Be it known that'EI, ROBERT H. HAWTHORNE, of New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in SewingMachines, of which the following isa specifica tion. i

I will first describe a sewing-machine embodying my improvement, and then pointout in the claims the various features of the improvenient.

In the accompanying drawings, Figure l is a plan of a machine embodying my improve ment. Fig. 2 is a parllylsectional elevation of the same, taken at the pla-ne of the dotted line x x,.Fig. l. Fig. 3 is a partly-sectional elevation of the same, taken at the plane of the dotted line y y, Fig. l. Fig. 4 is a plan or top View of the bed-plate, a detachable section with which it is provided being removed. Fig. 5 isa vertical section taken on' the plane of the dotted line z z, Fig. 4. Fig. (i is a sectional elevation of the machine, taken at the plane of the dotted line o o, Fig. l; and Fig. 7 is aperspective view of the feeding device detached, and having a portion broken away. Y

A designates the needlebar of the machine. The needle B may be secured to the lower end of the needle-bar in the ordinary or any other suitable manner. rIhe needle-bar is shown as secured by a screw, u, in a socket, b, provided for its reception in the end of a sliderbar, C. The slider-bar has a iiat shank fitting in a vertical guideway provided for it in a standard, D, erected on the bed-plate E of the machine. The guideway of the standard D comprises plates which are secured in place by screws, and hence may be removed at pleasure. The upper end of the slider-bar C is bent over considerably beyond the standard l),in order that the needle-bar A may be located at some distance from the standard; The advantage `of this is to afford room ior the work.

On the slider-bar C is a stud, c, which has connected to it a pitman-rod, F. The lower end of the pitmanrod F lits an eccentric, G', affixed to a main or driving shaft G. In

lieu of the eccentric, a crank or cam may be used. The shaft G is journaled in the bedpla-te, and has arranged upon it, close to the eccentric G', a belt-pulley, G2. A belt applied to the pulley G2 may transmit motion to the shaft G. On the shaft G is also shown a wheel or pulley, Gi'. As the shaft G rotates, the sliderabar C is reciprocated up and down and carries the needle-bar with it. The

' means described for reciprocating the needlebar are very simple, are very direct in action, and are not liable to -get out of order.

H designates a presser-bar supported in `bearings in an arm, D', extending from the upper part of the standard D. A tongue, d, extending from the presser-bar and fitting in a slot or recess in the upper bearing of the arm D', prevents the presser-bar from turning. A spiral spring, H', surrounding the presser-bar between its upper bearing and a `pin projecting from it,impels the presser-bar downward. The presser-bar may be raised by manipulating a cam-lever, Hwhich is piv- Oted to it by a screw, e, and iinpinges against the top of its upper bearing. f

I is a tension device, which maybe Of ordinary or any other appropriate construction.

J designates a spool-holder, consisting, as here shown, of a metal rod extending from the standard D.

On the inner end of the shaft G, in line with the needle,l is a rotary looping-hook, G". I will now describe the feed mechanism.

K designates a metal bar hung at one end on a stationary support,and having a reciprocating and a swinging movement. It has on the top, at the rearward end-or, in other words, at the cndwhich is the nearer to the shaft Gv a feed-piece, s. rlhe support o n which this bar K is hung consists of a metal screw or pin, K', fastened to a rib, E', under the bed-plate E, and having upon it a shoe, Ki. The bedplate E, the standard D, and the rib E' may be cast together. The shoe K`l fits snugly between the upper and lower sides of a slot, f, with which the bar K is provided. The slot f of the bar K is longer than the shoe K2; hence the said bar may be slid lengthwise over the said shoe. At the front of the slotf is a packing, f', Of leather orother suitable material. This is used to prevent any noise-when the bar K is limited in its rearward movement, or movementtoward the shaft G,by the shoe. A spring, K", is arranged in a socket in the bar K, to the rear of the shoe K2, and at the front IOO or inner end it impinges against the rearward side of the shoe; hence it always tends to move the bar backward or toward the shaft G.

K4L designates a rod which at one end lits a crank or eccentric, G5, with which the shaft G is provided, and at the ot-her end fits in a socket in the barK. The outer portion of this socket is internally scrcw-threaded, and has inserted in ita screw, K5. Preferably this screw is split so as to form two resilient portions, which,by their pressure in the socket,produce such friction that the screw cannot be accidentally turned in the socket. Between the rod K4 and the screw K5 there are preferably interposed a washer or plug. g, of leather or other soft material, and a thin metal disk, h.

The washer or plug is used simply to avoid the noise which otherwise would result from the contact of the rod Kt with the screw K5.

As the crank reciprocates the rod K* it alternately causes it to press toward the screw K and then move in the reverse direction.

. When the rod moves in the direction last referred to, the spring K3 causes the bar K to move in the same direction as far as it is capable of moving. By adjusting the screw K5 into the socket so far that when the bar is moved into its eXtreme rearward position, or as near to the shaft G as it can go, there will be no space between the screw, the disk 7L, the plug g, and the rod K5; the bar will be moved back and forth a distance equal to the full throw of the crank or eccentric G5, and a very long stitch will be made in the work. When, however, thescrew K5 is adjusted more or less outward, the rod K4 will be capable of moving some distance before exerting any force against the screw; hence there will be more or less lostl motion between the rod and-the screw and the bar K will be moved a shorter distance. The stitch produced will thus be shortened. By adjusting the screw the stitch may be varied at pleasure.

The bar K is always moved backward or toward the shaft G by means of the spring K3 to the same position, because even when the extent of its movement is varied the variation is made in the movement which is derived fromthe crank in the opposite direction. It follows, therefore, that the said bar K is always moved up into the same position relatively to the needle.

The extent of the feedmovement of the feed-bar, as herein shown, depends upon the length of the rod Kt, the thickness of the washer or plug g and disk h, the position of the screw K5, and the length of the slot f rearward of the packing f/, as compared with the distance between the forward and rear sides of the shoe KL. The length of space between the packing f and the rearward end of the slotf,as compared with the distance between the forward and rear sides of the shoe K2, must of course be at least as great as the eXtreme length of throw which the rod K4 is capable of imparting to the feed-bar when the screw K5 is in its most forward position.

The screw K5 at the forward end of the bar K forms an abutment,against which the force of the crank or eccentric G', transmitted th rough the rod K4, operates. Therefore by adjusting this screw K5 longitudinally in the bar K the forward motion imparted to the bar K may be varied. As,however, the rearward motion of the bar K is produced solely by the spring K5, the bar K will be always moved backward to the same position, no matter how much its forward movement may have been restricted by the adjustment of the screw K5.

I am aware that it is old to construct feed mechanisms in which the extent of the move` ment has been limited, and I do not claim, broadly, such limitation; but what I have in vented is a new combination of parts for effecting the limitation of the forward movement of the feed-ba'r, while the limit of its backward movement remains always the same.

Vha-t I claim as my invention, and desire to secure by Letters Patent, is-

l. In a sewing-machine, the combination of a bar for effecting the feed of the work, a support on which the bar is hung near its forward end, a shaft, an eccentric or crank on said shaft, a rod connected to the eccentric or crank, fitted loosely into a socket in the end 9 of said feed-bar and serving to impart motion to the bar in one direction, and a spring within the said feed-bar for imparting motion in the reverse direction, substantially as specied.

2. In a sewing-machine, the combination of a bar for effecting the feed of the work, a support on which the bar is hung near its forward end, a shaft, acrank or eccentric on said shaft, a rod connected to the crank or eccentric, tted loosely into a socket in the end of the feed-bar and serving to impart motion to the bar in one direction, an adjustable abutment with which the bar is provided and against which the rod exerts its force, and a spring within the feedbar for imparting motion tothe bar in the reverse direction, snb stantially as specified.

ROBERT H. HAWTHORNE.

Witnesses:

T. J. KEANE, E. T. ROCHE.

IOO

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