USRE7384E - Improvement in sewing-machines - Google Patents

Description

4 Sheets--Sheet1.

- E. TOWNSEND, Deed. The Shoe Machinery Manufacturing Company. Assignee of HENRY E. TOWNSEND, Admmistrator.

SEWING-MACHINE. No. 7,384. Rei-ssued.Nov.7,1876.

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E. TOWNSEND, Decd. The Shoe Machinery Manufacturing Company, Assignee of HENRY E. TOWNSEND, Administratol SEWING-MACHINE.

Re issued Nov. 7, 1876.

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E. TOWNSEND. Deed.

' The Shoe Machinery Manufacturing Company, Assignee 0f HENRY E. TOWNSEND, Administrator:

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No. 7,384. Reissued Nov.7, 1876.

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4Sheets-$heet 4. E. TOWNSEND, Dead. The Shoe Machinery Manufacturing Company, Assignee of HENRY E. TOWNSEND, Administratmr'.

"SEWING-MACHINE. I No. 7,384. Reissued Nov 7,1876.

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.UNITED STATES PATENT OFFICE THE snon MACHINERY MANUFACTURING COMPANY, or BOSTON, MAssA GHUSETTS, ASSIGNEE OF HENRY ELMER TOYVNSEND, DECEASED.

E. ,TOKVNSEND, ADMINISTRATOR OF IMPROVEMENT lN SEWlNG'dVlPiCHlNES.

Specification forming part of Letters Patent No. 34,915, dated April 8, 1862 reissue No. 7,384, dated November 7, 1876; application filed September 15, 1876.

To all whom it may concern:

Be it known that ELMER Townsnnn, late of Boston, in the county of Sulfolk and State of Massachusetts, invented certain new and useful Improvements in Sewing-ll/Iachines, of which the following description, taken in connection with the accompanying drawings, is a specification:

Figure l is a front elevation, Fig. 2 a side elevation, 'Fig. 3 a longitudinal section, Fig. i an under side view, and Fig. 5 a transverse section, of a sewing-machine constructed in accordance with this invention.

This invention has more especial reference to sewing-machines for sewing leather.

Inthis machine a reciprocating awl, operating from above, perforates the leather, held down by a prcss'er for the passage of a hooked needle from below, up through the hole in. the leather, where the needle (it being provided with the usual castoff) is supplied with thread by a thread-carrier. The hooked needle, in addition to its regular sewing movement, has a feeding movement imparted to it through a movable carriage, in which the nee die-bar and cast-off are reciprocated, the feeding movement of the needle taking place when the presser is lifted from the work.

The invention has reference to the combi nation of an awl for punctnrin g the material, and a lifting-presser and a thread-guide above the table, with a hooked needle and cast-off below the table, the hooked needle with its cast-off being adapted to form the stitch and to feed the material for each new stitch.

In the drawing, n, represents the frame of the machine, 11 the overhanging arm, and c the main or driving shaft. The small postlike work-support 01, provided with a removable needle hole or throat-plate, e, is adapted to be placed within the article to be sewed, or the article may be so placed upon it as to extend down either wholly or partially around it.

. The awl h is carried by an awl-bar, z, guided in the head j, and it is reciprocated through the action of'avibrating arm or lever, is, pivoted at l, and moved bya camgrooved hub,- A pin, a, on lever it, enters a s1ot, 0, in a hub on the shaft 1), providedat its lower end with a thread-carrier, q, andthe movement of the pin turns the thread-carrier away from the hooked needle, to supply it with thread for the formation'of-the seam. The presser-foot 1' has a socket at top, and is fitted to the lower end of the presserbar .9 by a set-screw. The presser is held down positively against the work at all times, except prcssenlnir.

When the needle is actuated to move the material for a new stitch, the presser is lifted positively above the material, thereby relievin g it from pressure, to prevent abrading the qsprface oi the leather by friction between the presser and support. The presser is lifted by a"levfiii -ggeoperated by a grooved cam, w, on shaft 0, through a lever, x, and an adjustable comiecting-link, y, the latter having a nut, z, to shorten or lengthen thelink to adapt the foot tothc thickness of the leather.

The needle-bar c, provided with a hooked needle, 1, is reciprocated in suitable bearings of a post-like needle-can'ying head, 1;, adapted by its movement to impart the feeding movcment to the hooked needle while the latter is yet in the material and the presser is lifted. The needle-bar is connected by link'c with an elbow-lever, (Z, operated by a cam, 0, through a radius-bar,f, and a link, g, connecting the radiusbar and elbow-lever. The cast'off bar h, provided with a cast-off, 2, is supported in bearings in the head I), is provided with lugs 3 3, and is operated by the lug 4 on the necoif bar being held against movement (except through the lug 4) by means of a friction device, 5, shown as attached to a spring, 6, adjustable by lneans'of a screw, '7.

In Fig. 5 of the drawings the hooked needle movement, and as having started to descend, the presser also moving down. The upper portion of the cast-oftlit-s closely about the side of the needle, and its extreme point,

when the cast-0d is in its highest position,

shaft, and causes it to vibrate toward and when the needle is performing its feeding movement, by means of strong spring t, that rests at one end upon a projection, 11;,of the dle-bar as the latter rises and falls, the castis shown as having completed its feeding" terminates a little above the level of the throatplate, just far enough above such level to touch or enter the under side of the material being the needle shank alone, and, consequently,"

when the hooked needle descends, the east-off point, already within the d uble of the loop,

;and holding it against the-under side of the material, easilypasts the loop overthe hook,

then supplied with a new loop.

As the needle-bar and needle move from the position shown in Fig. 5 downward, the

lug 4: leaves the upper lug 3 of the east-off bar, and the cast-off and its bar remain stationary, the cast-ofi holding the-old loop yet on the needle-shank open, sothat the hook of the needle does not engage it as the hook passes out of the material.

Asthe hook emerges from the under side of the material and into the bight of the old loop on its shank, the lug 4 meets the lower lug 3, and then the needle and cast-oh descend together, the cast-off closing the front side of, and retaining the new loop in, the needlehook. When the needle-bar rises to enter the hole made by the awl working from -the opposite side of thematerial, the lug 4 leaves the lower lug 3, the cast-01f remains down, and it is not raised until the lug 4 meets the upper log 3, and then the needle and castot'f move together until the cast off meets the under side of the material, the needle be ing then at its highest point. The needle, in rising, enters the hole in the material made bythe awl, and while the awl is yet in the material. The needle and awl rise substantially together, their points being but little separated, and the awl keeps open for the passage of the needlepthe hole in the material then being subjected to the action of the presser-foot, and then held pressed down upon the throat-plate. When the east-cit bcgi us to rise,

it meets the loop of thrcad'just drawn down by the hook of the needle, and made slack or loose on the necdlc-sl1ank as the needle rises to enter the material. The castoff in its mow-meld, passes into this loop, or between its doubled par and the side of the needle, this being done before the thread-guide draws this last loop taut. As the needle reaches its highest position, the prosser is lifted, relieving the material from pressure, and then the neodle has imparted to it its feeding movement,

and at the termination of the feeding movement the pl'esscr is thrown down, and the needle descends. After the needle reaches its highest position the awl'is further lifted, makin g a passage for the thread-carrier to present its thread in tlie 110 1; .ifll tlib'lleedlu'. The needle takes the thread during its descent, and after the completion of its feeding movement.

able pin, Z,.attached to the head.

The apparatus for imparting to the needle its feeding movement is shown as a post-like head, bflplace'd immediately in front of the post-like work support, and adapted to be moved away from the operator or toward the back of the machine, a portion of the head being fitted to ways, and operated/to give the needleyits feedingmovement through the actiomo' it cam, i, and a slide linlgj, connected with an elbow-lever, 7c, the arm 8 of the elbow-lover beinggrooved to receive an adjust- By moving this pin toward or away from the fulcrum of the elhow-iever the distanceof the feeding movement of the needle, and consequently the length of stitch, is regulated. The thread in the eye of the thread-carrier is supplied to the needle, the carrier being actuated bysuitable mechanism.

The presser may be lifted at any time by hand through the hand-lever n, it, when ele vated, acting upon and moving lever r.

The lever o is adapted to be connected with a foot-lever, to lift the presscr when desired. The head in which the needle and cast-01f work is arranged to move directly in front of the post-like support and under the overhanging needle-hole plate, and the needle and cast-off and their bars are readily accessible, which would not be the caseif the head were inclosed in a hollow vertical post. The extentof feeding movement of the head is such as not to interfere with the work placed about the post-like support and the head b.

it the duty of feeding the cloth were to be performed by the awl instead of the needle, the conditions under which the feeding would be ell'ected would be quite difli'ercnt from what they are when the feeding is done by the ncedle in themanner I have described. The awl, when used to feed the material, is caused to penetrate and move the material during the time that the needle in its lowest position holds the loop, thereby straining the loop, and f quently breaking the needle, which y serious evil. VVhen the awl is employed to feed the material, the latter is also free from. pressure by the presscr. When the awi. feeds the material, (the needle holdingthe loop down below it,) it is not so easy to feed the material in a straight line or to turn a sharp corner, for the material is hold at two points, viz., at the point where the awl engages it, and at the point where the loop of thread is connectcd with the material, and the material is apt to be twisted out of its true course, and also with thin 'nniterial the draw on the loop the awl feeding is apt to ruck up the material be twren the last stitch or loop made and the awl.

\Vhon the needle feeds the nmterial, the lat ter-may be turned to change the course of the scamat any time from the commencement to the completion of the feeding movement, the needle serving as the piv tal center for the materiahit being the only point at which the material is held.

When the awl feeds the material, the latter mustbe turned to change the direction of the seam .just at the time when the awl reaches its position immediately over the needle, and

consequently the time at which the feed can take place is restricted, requiring more expert operators to run such a machine than are required for the needle-feed machines.

It is not new, broadly, to feed the material by means of a needle.

What is claimed is- 1. An awl to puncture the material, a lifting-presser, and a thread-guide, all' arranged above the material and work-support, in combination with a hooked needle and cast-01f be- ,low'the table, and with means to impart to them movements to form the stitch and feed the material, substantially as described.

2. The post-like work-support and its overhanging throat-plate, in combination with a movable'head, adapted to carry the hooked needle and cast-oil", and impart to the needle

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