US177037A - Improvement in sewing-machines - Google Patents

Description

2 Sheets-Sheebl A. H. WAGNER.

vSE'WINCr-MACIIINE. y "P atented May 2,1876.

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A. H. WAGNER.

SEWING-MACHINE.

` N.177,037- Patented May 2,1876.

UNITED STATES PATENT A AUSBERT H. WAGNER, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SEWING-liflACl-IINES.-v

Specification forming part of Letters Patent No. 177,037, dated May 2, 1876; application filed February 16, 1876. v

. To all whom iiimay concern:

Be it known that I, AUsBERT H. WAGNER, of Chicago, in the county of Cook, and in the State of Illinois, have invented certain new and useful Improvements in Sewing-Machines; and do hereby declare that the following is a full, clear, and exact description thereof, refercnce being had to the accompanying drawings, making a part of this specification, in whiehp Figure 1 is a plan 'view of the lower side of my improved machine, with theoperativeparts in position to move. the needle to its lowest point. Fig. 2 is a like view of the same, show. ing said parts in position to raise said needle toits highest point. Figs. 3 and 4 are side elevations of said machine, showing the relative positions of said operative parts as arranged in Figs. 1 and 2, respectively; and Fig. 5 is a cross-section of the lower end -of the vibrating arm and the sliding block employedV for connecting the same with-the crank-arm for operating said arm.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to simplify the mechanism employed for im parting the necessary variable motion to the vibrating arm of a sewing machine, and also to reduce the backlash to a minimum 5 to which end it consists in combining, with the lower end of the vibrating arm of a sewing-machine, a sliding block, which worksl within a longitudinal groove provided in said arm, a crank-arm that is pivotedor journaled at one end to or upon the base-plate, that occupies a position substantially at a right angle to the line of the end of said vibrating arm,and has its lower or free end connected with said sliding block, and with suitable mechanism for giving to it a reciprocating motion, substantially as and for the purpose hereinafter specified.

In the annexed drawings, A represents the hase-plate, B the fixed arm, C the housing or n head, D the needle-bar, and E the vibrating arm, of a sewing-machine, all constructed, in the usual manner, above said base-plate. Jonrnaled upon the lower side ot' the bascplate A, midway between the pivotal bearing e and the forward end of the vibrating arm E, is a crank-arm,'F, which is arranged to oscillate in a vertical plane having the same line as said vibratingarm., and at its lower end is connected to or with a crank, G, upon one end of the driving-shaft H by means of a bar or rod, I, that at its ends is pivoted or journaled upon said parts, the arrangement of said parts being such as to cause said crankarm F to have an oscillating movement as said shaft revolves. The lower end of the vibrating arm D extends forward and downward, as seen'in Figs. 3 and 4, andis provided with a cylindrical opening, E', which extends longitudinally inward from its end. Upon the side adjacent to the crank-arm F the wall ofthe cylindrical opening E is removed, so as to form a slot, e', and within said opening is loosely fitted a correspondingly-shaped block, K, which at its longitudinal center is provided with a cylindrical recess, It, that receives and is caused to reciprocate by thev rotation of thedrivin g-shaft.

The operation of the mechanism described is as follows: When the crank G occupies the position shown by the full lines of Fig. 3, the crank-,arm F has substantially a right angle to the cylindrical opening E of the vibrating arm E, and the needle-bar` D is at its lowest point. As the said crank G continues its motion, said crank-arm F is moved upward and rearward, and carries the engaging end of said vibrating` arm upward, so as to slightly raise said needle har and the needle, and slacken the thread which the latter has carried through the cloth, the relative positions of said parts being shown by the dotted lines of Figs. l and 3. Upon continuing the motion ofthe crank G, the needle-bar D again descends, and reaches its lowest point as said crank attains the position shown by the full lines of Figs. 2 and 4, after which the further rotation of said crank to the position shown by the dotted lines of said figures causes said needle-bar to rise to its highest point and the needle to be withdrawn from the cloth. It

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2 unos-r will be seen that at the time when the `needle is entering the cloth, and thengreatest strain is thrown upon the operative mechanism, the

crank G has a right angle to the line of the i bar I, and exercises its greatest power While the sliding block K `is near the, lower` end `of thevibrafing arm, so that the crank-arm F exercises its greatestforce upon said arm, the

1 power being thus caused to correspond `tothe requirements ofthe machine.

In consequence of the means employed forj' operating the vibrating `arm,` the only hack lash possible is such as may be due to theplay in the sliding block and in the journal 'of the crank-arm, and no amount of wear in the cennecting-bar or in the drivin g-shaftcan increase the baekash of said vibrating arm. i

` The cylindrical form of thesliding block and itsi opening insures the greatest amount of bearing-surface with 'the least quantity ot February, 1876.

metal. It enables said block to adjust itself periplierally in case the crank-pin f is4 not cxi actly in a line at a right angle to the plano of motion of the crank-arm. It prevents lateral movement of said block 'withinits. openi ing, and it renders necessary but little weight of metal in the lower portion of the vibrating arm. y

It'desired; the cylindrical openii-ig may omitted, and a` square opening and a `correspondiuglyshaped block substituted therefor. Having thus fully set forth the nature and merits of my invention, what I claim as new In a sewiugr-machine,` the combination of a sliding block, which works longitudinally' within a coi-'responding groove in the lower end ofthe vibrating arm, a crank-arm that is Apivoted or journaled at one end to or upon Aythe.baseplate, that occupies a position substantially at aright angle to the line'of said vibrating arm, and has its lower end con neeted 1 with said sliding block, and suitable mechan- ;ism for giving to Said crank-arma reciprocating motion,.substantially as and for the purpose specified. y p

o In testimony that I claim the foregoing I have hereunto set my hand thisl'th day y of AUSBERT H. WAGNER.`

Witnesses: f

GEO. S. PRINDLE, WILLIAM Frcrcn.

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