US41164A - Improvement in sewing-machines - Google Patents

Description

J. S. MOGURDY. SEWING MACHINE Patented Jan. 5, 1864.

UNITED STATES PATENT OFFICE,

JAMES s. Metronomes BRIDGEPORT, CONNECTICUT.

\MPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 41.1.64. dated January 5,1864.

the direction of the arrow, Fig. 1) and back-- ward. The lower end ofthe feed-bar'termi; hates in an eccentric ring,.E, which fits'upo -r an eccentric, F," that is secured to a rotating shaft, m, whose length is at right angles to the line in which the cloth is to be fed. The ee centric ring is retained upon the eccentric by a washer, 'n, and screw. The length of the feed-bar is such that during abonthalt' arevolution of the eccentric in the direction of the arrow 10, Fig. 2, the surface of the roughened head is above the surface of the bed upon which the cloth lies, while during the other halt of the revolution the surface of the roughened head is below the surface of that bed.

, The slotted part of the feed-bar between its two ends is titted upon a block, s, which'is constructed to rock upon a stud, 1*, that is secured to the support G, so that the feed-bar can slide to and fro and also oscillate upon'the stud 'r i as a fulcrum, the block 8 beinginterposed between the stud and the feed-bar for the purpose of affording a larger sliding-surface than the round stud would aii'ord. The slot is oblique, or, in other words, is inclined to a line drawn from. the center of the eccentric-ring'E to the center of the roughened head B, and the i elination is such that when the feed-bar is moving from thesurface of the bed c-e upward the tendency of the eccentricto rock the roughened feeding-surface forward is compensated by the antagonistic inclination ot" the slot to cause the roughened feeding-surface to move backward, so that the feeding-surface rises above the surface of the bed-plate in a direction practically perpendicular to thesuri'ace ot the cloth. The compensating action is continued until the feeding-surface has risen sutiiciently to takea firm hold of the material to be moved, when it .becomes subsidiary to the oscillating movement of the bar produced by the passage of the eccentric center along the uppermost quarter of its revolution, at which time the sliding of the i'eedbar on its fulcrum is but small. 3V hen on the other hand the acv tion of the eccentric causes the feeding-surface to descend theinclination ot' the slot causes the forward movement of the feeding-surface to begreater than that which would result from the action of the eccentric alone. When the eccentric has withdrawn the head of the To uli'whom it may concern: Be it known that I, JAMES S. MOCURDY', of Biidgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful improvements in feed mechanism for sewing-machines and for other purposes to which it is applicable; and [do hereby declare that thefollowing is a full, clear, and exact description of my invention, reference being had to the accompanying drawings, in which- Figure 1 represents a side view of the bedplate of a. sewing-machine with a feed mechanism of my construction applied thereto, and Fig. 2 is a vertical longitudinal section of the same through the center of the feed-bar. .The object of my invention is to move forward cloth or other material by a series of steps without appreciable noise, and also to havethe means of readily varying the extent of the movement ateach step.

To this end the first part of my invention consists of the combination of a feed-bar slotted obliquely to its length, a fulcrum upon which itboth oscillates and slides longitudinally-",and an. eccentric for imparting motion to it, the whole operating in such manner that the eccentricimparts the rising and descending movements and also the forward and retrograde movements to the acting'end-ot' the feed bar, and that the motion so imparted is modified by the obliquity of the lslot, so that the feed-bar takes a firm hold upon the cloth be fore it moves it forward.

The second part ot-my invention consists'in the combination of the first part of my invention with means of adjusting the position of the fulcrum in reference to the eccentric,- whereby the length of the feed at each operation can beregulated'.

Both parts of my invention are embodied in the mechanism represented in the accompanying drawings.

The'feed-barA consists of a slotted plate terminating at its upper end in a head, 13v, which is rdughenedby small teeth, so that it can take hold of the cloth, is of sufficient breadth to afi'ord the amount of toothed surface required to move cloth, and is 'guided by a slot, 0,111 the bed-plate D, in which 'itrises and descend-s and also moves forward (in'the "feed-bar into the slot of the bed its continued bar, because it is clear that the same result movementcauses the feed'bar-to oscillate back will be produced if the portion of the feed bar ward upon 'its fulcrum, so asto cause the feedbetween its head and the eccentric-ring may jug-surface to retrograde to the proper posi be a plain bar, and this portion be arranged tion it is to occupy when itis again protruded. to slide-in an oblique slot made in a head The feed mechanism thus constructed is to formed upon the fulcrum-pin or fitted to rock In this ca be operated in connection with an antagonistic the feed-bar must b surface to press thematerial in contact with ned feeding-surface of the head of se thestraight portion of e inclined in the same manslot to produce the same antagonistic eifect to the operation of the cocentric. The eccentric may of course be replaced hy-a crank of the same throw.

I do not claim the combination of every slotted feed-bar with a fulcrum and eccentric; but

What Iclaim as my invention,and. desire to secure by Letters Patent, is

L'The combination of an oblique slotted feed-bar, fulcrum, and eccentric, or their equivalents, operating substantially'as herein set forth.

- 2. The combination feed-bar, fulcrum, and

with

sewing-machines. I

In order to vary the extent of movement of e feeding-surface in a forward direction the support G, which holds the fulcrum-stud?" of the feed-bar, has the form ofa lever, which is pivoted at one end, 2, to a hanger depending from the bed-plate, and is controlled at the other end by two screw-nuts, H H, which are fitted to a scre w-standard, Lthat passes through a slot in the adjacent end k of th of said oblique slotted their equivtheposition e eccentric, the parts of the feed-bar above and, below th fulcrum will bethereby changed quently the head, whic face, will be moved les tio'n theclotb is to be fed tautially as set forth crating subs ny whereof I have hereunto set- In testimo my hand.

s or more in the direcby the'sume movement q of the eccentric. Witnesses:

he invention is not of necessity limited to D. GooDsELL, the arrangement of the oblique slot in the'feed- F. HURVD,

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