US235377A - peare - Google Patents

Description

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y ,G-.R. PEA-RB. -Boot-and Sho'e Sewing Machines. No. 235,377. Patented Dec. 14V, 1880.

Fiyi MPETERS. PHO10-LITMOGHFIIER| WASHINGTON. D. (I4

UNITED STATES PATENT FEICE.

GEORGE R.' PEARE, OF LYNN, MASSACHUSETTS, ASSIGNOR TO HIMSELF, AARON `F. SMITH, AND GEO. W. HOYT, OF SAME PLAGE.

BOOT AND SHOE SEWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 235,377, dated December 14 1880.

Application filed J' une 26, 1880.

To all whom it may concern Beit known that I, GEORGE It. PEARE, of Lynn, of the county otEssex and State of Massachusetts, have invented a new and useful Improvement in Boot and Shoe Sewing Machines; an d I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figure l is a side elevation of the horn of a KcKay sewing-machine with my thread-tension 'regulator applied thereto. Fig. 2 is a transverse section of such and the thread-waxer, such section showing my improved arrangement of the thread-stripper relatively to the lower guide and the guide-roll to and from which the thread is led from the waxer to the tension-regulator. Fig. 3 is a top view, and Fig. 4 an edge view, ofthe thread-stripper, to be described. Fig. is a top view of the mechanism to be described, excepting the inclined part of the arm A, as hereinafter explained. Fig. 6 is an enlarged sectional view of the tension-wheel and its frictional devices, it being taken through the axis of the shaft or spindle thereof.

The nature of my invention is fully set forth in the claims hereinafter presented.

The object of the tension-regulator, which I have combined with the McKay sewing-machine, or the horn thereof, is to cause the waxed thread to be delivered to the looper or wheel with a uniformity of tension.

It is well known to those who are skilled in the use of the McKay sewing-machine that from various causes the tension of the thread is apt to vary more or less, whereby the sewin g is effected disadvantageously. I have therefore added to the said machine a mechanism to regulate the tension of the thread or keep such uniform; and, furthermore, I have arranged the thread-stripper of the waxer so that the thread, on passing through such stripper,` does so at a right angle, or thereabout, to its jaws, whereby the thread becomes uniformly waxed around it. The thread-stripper I have so made as to enable the thread to be readily passed in between the jaws or removed therefrom, as occasion'may require.

In the said drawings, A denotes the horn or (N o model.)

boot or shoe holding arm of a McKay sewingmachine, the base or lower portion, c, of such horn being fixed to a vertical shaft, b, so as to be revolublewith suoli.

Resting on and secured by screws c to the cap-plate d of the hollow portion a of the horn is the sustaining-frame e of the tensionregulator. In this frame there is fulcrumed a furcated lever, B, having at the termination of its longer arm a journal, f, to receive and support a grooved guide-wheel, C. The fulcrum of the lever is shown at g as having a bearing in a standard, h, of the frame c. From the said standard a journal, z', projects and supports a guide-wheel, k, arranged upon it, as shown.

A spring, D, formed as represented, and which should be properly supported, has one arm, l, resting on the longer arm ofthe lever B, or a stud projecting therefrom. The shorter arm m of the spring is turned up and inserted in a socket at the lower part of a screw, n, which screws through apost, o, there being upon the screw a set-nut, lo.

There extends up from the shaft b a spindle, q, which is arranged between the prongs of the lever B. A disk, r, supported on the said prongs, slides freely ou the spindle q, and is arranged concentrically thereon. On the disk is a washer, s, of leather or other proper material, on which rests the tension-wheel E, formed as shown.

From the top of the hub of the tension-wheel two short standards, t, are extended, as represented. A plate, u, slides vertically on the said standards and on the spindle, the standards serving to cause such plate to revolve on the spindle with the tension-wheel. A washer, c, is placed 011 the spindle and plate u, another such washer, o, being similarly arranged underneath the plate u, and upon a metallic disk, w, that is free to slide vertically on the spindle, but not to revolve thereon. There is between the disk w and the hub ot' the tension-wheel another washer, a'. A rnetallic disk, y, resting on the upper washer, fn, and adapted to the spindle so as to slide vertically, but not to revolve upon it, is forced downward by a helical spring, z, encompassing the spindle, and arranged under a nut, a',

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which is screwed on the spindle and against the upper part of the spring.

By means of the said nut and the screw b ofthe spindle, and also by means of the washers v v, the plate u, the metallic disks 1r and y, and the washer x, and the disk r, applied to the spindle and the tension-wheel,asdescribed, the said wheel is not only caused to be revolved with friction by the thread, but such friction may be increased by setting down the nut on its screw, and be diminished by turning the nut the opposite way.

The thread is shown at c' as passing from the reservoir ll' of the waxer between thejaws ef ofthe stripper F, thence to and partly around the guide-wheel lr, thence into the groove d2 of the tension-wheel Il, thence partly around such wheel, thence to and partly around the grooved periphery of the wheel C, and thence up to the upper part of the horn and into and through the looper or wheel thereof in the usual manner, and to the needle'c.

The stripper has itsjaws arranged at right angles, or substantially so, to the part of the thread which is between the wheel l.' and that thread-guide f2 at theI bottom of the wax-reservoir from which the thread passes directly to the jaws.

The lowerjaw, e', of the stripper l is tixed to an inclined standard, g', which is formed with an opening to receive the upper-jaw carrier, h', which, at its upper part, is pivoted to the standard y'. The jaw f is adapted to the carrier l'z',so as to slide lengthwise thereon, and has applied to it and the standard a screw, yi', in manner to enable the jaw,by such screw,to be moved either toward or away from its fellow jaw. A spring, lr', properly fixed to the standard and to the upper-jaw carrier, forces the latter down to place to bring the upper of the jaws into proper relation to the lower of them. Should there be a knot in the thread, whereby the passage ofthe thread between the jaws would be obstructed, the upper-jaw carrier, with its jaw, by the pressure of the knot,would be drawn upward relatively to the lower jaw, in order for the knot to pass the jaws.

In the standard g', opposite the bite ot' the jaws,and leadingont ot'such standard in manner as shown, is a passage, I', through which the thread can readily bc passed to and from the bite of the jaws,thus saving the necessity of passing an implement or hook between the jaws and seizing the thread and drawing it between them, as usually heretofore done.

Should the draft or tension on the thread increase beyond the amount required, the lever B will be moved so as to cause the friction on the tension-wheel E to be accordinglydiminished, and thus equality of tension will be secured by my regulator, the tension-regulator above described operatingautomatically, whereby itdiffers essentially from that shown in the United States Iatent No.229,049,whose lever,instead of being operated by the thread, has to be by the hand of an attendant. My thread-tension regulator also diters, both in construction and operation, from that shown in the United States Patent No. 27,948, though each has a lever to be moved by the draft of the thread. In my mechanism there is the adjustingscrew n to revolve on the spring, and there is to such l screw and its supporting-standard o a set-nut, p, there being no such application of a screw anda set-nut in eitherofthe mechanisms shown in the said patents.

Furthermore, it will be seen that with my improvement the wheel E is disposed over or near the shaft b, and the lever B is extended toward and has its longer arm terminating in close proximity with the inclined part of the horn A. By this arrangement the wheel E and its friction devices are carried so far from the inclined part of the arm as to be entirely out of the way of a boot-leg when encompassing the arm.

What I claim as of my invention may be stated as follows, viz:

l. The combination of the sewing-machine rotary arm or horn A with the automatic threadtension apparatus, substantially as described, consisting ofthe grooved wheel E, its friction apparatus, the lever B, spring D, guide-wheel C, adjusting-screw u, clamp-nntp, and stainlard o, arranged with its wheel E over or in close proximity with the shaft b of the said horn, and with the longer arm of the lever B or its guidewheel (J in close proximity with the inner side of the inclined portion of the horn A, all heilig essentially and to operate as set forth.

2. The combination of the screw n and setnut p with the standard o, the spring,r I), lever B, and tension-wheel E, the latter beingr provided with friction apparatns, and all being to operate substantially as set forth.

3. The stripper, inclined standard, and lowerjaw carrier y', provided with the lateral passage l', in combination with thelowerjaw,and with the upper jaw and its adjusting-screw and carrier, arranged and applied substatitially as set forth.

4. The automatic tension-regulator, substantially as described, consisting of the grooved wheel E, its friction apparatus, the lever B, spring l) and guide-wheel C, adjusting-screw n, clamp nut p, and standard o, all being adapted and to operate essentially as set forth.

GEORGE R. PEARE.

'itnesses lt. H. EDDY, W. W. LUNT.

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