US33940A - Improvement in sewing-machines - Google Patents

Description

W. O. GROVER. SEWING MACHINE.

No. 33,940. Patented Dec. 1'7, 1861.

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WM. 0. GRQVEB, OF BOSTON, MASSACHUSETTS.

IMPROVEM ENT IN SEWlNG-MACHINES.

Specification thrming part of Letters Patent No. 33,940, dated December 17, 1861.

To all whom it my concern:

Be it known that I, WILLIAM O. GROVER, ofBoston, inthecounty of Suffolk and State of Massachusetts, have invented a certain new and useful Take-Up Apparatus for Sewing Machines; and I do hereby declare that the following, schedule, taken in connection with the drawings, is a full, clear, andexact description thereof.

In the drawings, Figure 1 is aside elevation of a machine with my apparatus applied thereto, the needle being at its highest position. Fig. 2 isalso a side elevation of the same parts, the needle being down to its greatest extent. Fig. 3 is a side elevation in detail. Fig. 4 is a rear elevation oft-he eyes and edge of the takeup apparatus, and, also a plan of the same, to-

gether with the fork or wiper, on a large scale. Fig. 5 is a rear elevatiou,in detail, of the takeup apparatus, needle, shuttle, &c.; and Fig. 6 isa side elevation of the eyes, edge, and fork or wiper on a large scale and in different relative positions.

My take-up apparatus attains the same result as thelit'ting-piu and its appurtenances in Elias Eiowes sewing machineit prevents slack thread from forming below the point of the needle. as it descends, and gives out thread when the eye of the needle passes'throug'h the cloth, and:has no tendency to steal the loop of needle-thread, and, in addition to theseresults ot'Howes contrivance, it lays the stitch truly.

The apparatus is" shown as applied to a machine with a needle,z, reciprocating in straight lines, and attached to a needle bar or stock, 3 This baris caused to move by a needle-arm, D, which is driven by a cam, F, on a revolving shaft below the table. The end of the arm projects through aslot in the rear ofthe piece B, which forms part of the needle-bar guide, and is suitably connected to the needle-bar, so

vthat the arm and bar reciprocate together.

. The machine hasa press'er-foot, shuttle, horizontal cloth-supporting table, a teed apparatus, and a shuttle-driving apparatus; all ot'any usual or proper form or construction.

The upper thread (colored red) is furnished from a bobbin, w, and passes'thencethrough a tension apparatus, u. This-tension apparatus is composed of two disks, concaved on their adjacent sides and bored through at thecenten They are slipped upon a. pin and pressed together bya spiral spring, and the thread is passed between the disks, around the spindle, and outward again between the disks. From this tension apparatus the thread passes through two eyes, A, pierced in two cheeks projecting rearward from the piece B, thence orer a small roller secured to the top of the needlestoclgand finally through the eye of-the needle. In passing from one of the eyes A to the other the thread leads across an edge, E, which projects rearward between-the cheeks.

To the needle-arm is secured a lork, G, the prongs of which are rounded off at their points. Thisfork is so secured and formed that its'prongs shall, during certain parts of the motion of the needle-airmen] brace the edge E and pass between the cheek-pieces. (See specially Fig. 4..) The: edge is at its lower part curved, or bent away from the fork.

The operation of the apparatus is as follows; Supposing thag the needle has risen to its full extent, has tig rtened astitoh, and has drawn upper thread off of the spool or bobbin, the position of the parts'theu being as in Fig. 1, the needle now commences to descend, forced downby the needle-arm, and as the arm carties the fork the latter descends with the needle and strikes the thread, which extends from one eye to the other, the edge holding this thread rearward, so thatthe prongs of the fork carry the thread down with them. If there were no fork. the needle in its descent would form twice as muchslack as is due to its own extent of motion. The fork, however, by its action, draws down a bight of thread, which, measured from one eye A to the other, is equal to twice its extent of motion, or a little greater or less, depending upon the shape or contour of the edge and the direction of motion and shape of the prongs. The thread therefore forms no slack below the needle, and the latter runs down the thread, leading alwaysiu a straight line from the needles' eye to the cloth. Just hefore'the needle-eye reaches the cloth the bight of thread acted upon by the prongs rides over that part of the edge which is bent forward or away from 'the.fork, and when the eye gets to the cloth, or at about that time, the bight ontheedge has slipped so far forward thatitis no longer acted upon by the fork. (See upper diagram in Fig. 4.) The needle now descending below the cloth takes up twice the length of thread, due to its length of motion and the bight between the eyes,

being released from the fork, slips outbetween the prongs and the edge, and furnishes the needed length for the nseot' the needle. While the needle-eye is descending below the cloth the fork and its prongs are descending, doing hothlng, (8% lower diagram of Fig. 4.)

When the needle commences to rise to form a loop there is no strain on the thread, and. consequently no tendency to steal a loop; and as the needle rises the fork ascends with it, doing nothing until it again reaches a position above the thread, and commences in its descent again to pull out a night of thread.

There is no slack ever formed below the needle eye or point, and consequently nodanger of intertangling or piercing of thread, and as the needle runs down a straight thread the stitch is properly and evenly laid. 4

The edge may be so shaped andadjnsted in reference to the fork that more or less length of bight may he formed or pulled out by a given length of descent of the forks and a change of-curve in its lower part; orachangeof position in the forks will cause the bight to slip out free from the fork at a sooner or later period.

The ofliee of the eyes is to hold a line of thread to be struck by the fork. The oflice of the edge is to hold the thread within the grasp of the fork as long as needed, and to a certain extent to regulate the time when the A fork shall cease to act on the bight of thread, and it shall be permitted to slip out between the edge and the fork.

The office of the fork is to pull out or develop a bight of thread so long as .the thread is held within its reach.

And these the acting parts of my contrivance may be various y formed, constructed, attached, and operated, so long as each performs its proper oflice, and'they, in combination, operate substantially as specified.

I claim as of my own invention- The combination of two eyes with an edge piece and a fork operatingin the thread on the downstroke of the needle, the whole constituting a. contrivance operating,- substantially in the manner hereinbefore set forth, and peribrmingthe offices specified.

In testimony whereof I have hereunto subscribed my hame- W: O. GROVER.

In presence of- JAMES H. BROWN, Enw. L. SHERMAN.

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