US723371A - Loop-taker for sewing-machines. - Google Patents

Description

. PATENTED MAR. 24-, 1903. W. F. DIAL & G. H. DIMOND. LOOP TAKER FOR SEWING MACHINES.

APPLICATION FILED SEPT. 19, 1902.

4 A TTORNE) PETERS co, PuoTaun-w WASH UNITED STATES ATENT OFFICE.

WILBUR F. DIAL AND GEORGE H. DIMOND, OF BRIDGEPORT', CONNECTICUT, ASSIGNORS TO WHEELER & WILSON MANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOO P-TAKER FOR-SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 723,371, dated March 24, 1903.

Application filed September 19, 1902. Serial No. 124,057. (No'modeL) To all whom it may concern.-

Be it known that we, WILBUR F. DIAL and GEORGE H. DIMOND, citizens of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in Loop-Takers for Sewing-Machines, of which the following is a full, clear, and exact description.

provide means whereby the contacting surfaces of the bobbin-case and loop-taker of a sewing-machine will be properly lubricated without endangering the soiling of the sewingr5 thread and without undue care on the part of the operator asto frequentoilings. Especially in machines runningat high speedsay from three thousand tofour thousand stitches a minute-is it necessary to keep the underzo thread mechanism Well lubricated'and at the same time guard the thread from being soiled. In the well-known Wheeler 85' Wilson No. 61 machine the bobbin-case has a radial fin which engages an annular groove in the loop-taker, and lubricant must be supplied to these engaging parts. For purposes of illustration, but without thereby limiting the applicability of the invention, the improvement will be described in connection with these 0 parts.

The invention comprises a bobbin-case receiver (which in the instance selected is the grooved loop-taker) having a lubricant-well arranged relatively to the part to be lubri- 3 5 cated, so as to deflect the lubricant when the receiver is in motion and permit it to feed when said receiver is at rest, thus automatically controlling the feed of lubricant and preventing oversupply, all as will be fully 0 described, and particularly pointed outand claimed.

In the accompanying drawings, illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 4 5 is a front elevation of a portion of the stitchforming mechanism and adjacent parts of a Wheeler & Wilson No. 61 sewing-machine, representing one adaptation of this invention. Fig. 2 is a rear elevation of the looptaker of the machine shown in Fig. 1 sup- This invention has for its main object to plied with our invention. Fig. 3 is a sectional elevation taken substantially in the plane of line A B, Fig. 2. Fig. 4 is a crosssection of the loop-taker with the Well-cover detached. Fig. 5 is a rear elevation of a portion of the loop-taker with the cover detached. Fig. 6 is a perspective view of the loop-taker having the usual loop-seizing point and castoff and provided with a hinged flange to permit of the removal of the bobbin-case. Fig. 7 is a perspective view of the cover detached. Fig. Sis a cross-section of part of the looptaker, showing a modified form of the lubricant-well.

For the purposes of illustration there are herein shown only such portions of a sewingmachine as are deemed necessary for a proper understanding of the invention. The particular class of sewing-machines or the specific construction of loop-taker, bobbin, or bobbin-case are not essential so long as the combination includes a bobbin-case frictionally supported within the cavity formed in the loop-taker or other receiver for such bobbin or bobbin-case.

Referring to the drawings, 1 is the bedplate, 2 the needle-bar, 3 the needle, 4: the presser-bar, 5 the cloth-presser; 6 the throatplate, 7 the feed-bar to which the feed-dogs are attached, and 8 is the feed-lifter, all of which are common to the well-known Wheeler & Wilson sewing-machine com mercially known as No. 61, and all of such parts may be as herein illustrated and described or of any other usual or approved construction.

The loop-taker 9 is provided with an annular groove 10 for'the reception of the fin 11, Figs. 1 and 3, formed on the periphery of the bobbin-case 12. When the loop-taker and bobbin-case are in operative position, as

ation of the machine when running at high speed that the frictionally-engaged surfaces of the two should be kept properly lubricated and without endangering the soiling of the sewing-thread. To meet these requirements, we have located an oil-well 15 in such relation to the axis of rotation of the loop-taker and to a duct, such as 16, Fig. 4, between the well and the annular groove in the looptaker, that the centrifugal force of the rotating loop-taker will cause the lubricant to be held away from said duct and groove; but when such loop-taker is at rest the lubricant will be delivered through the duct in sufficient quantity to properly lubricate the frictional surfaces, it being understood that should the machine be brought to rest with the oil-well uppermost and be left in this position for a considerable length of time as, for instance, from one day to the nextan excess of lubricant would be delivered to the frictional surfaces; but it is well known in the operation of sewing-machines that such superfluous lubricant is quickly and easily removed by running the machine for a very short time-a minute or two0n scrap material, which is the common method employed to clean a loop-taking mechanism when for any reason it has been excessively oiled. The oil-well is supplied with any suitable packing 17 in order to hold the lubricant.

As a preferred form of construction of oilwell we have provided the loop-taker with a bore 1 8, which connects with an outer funnelshaped mouth 19, over which is placed a cover 20, leaving an opening 21 for the insertion of the packing and through which oil is applied, and the bore 18 has the duct 16 opening into the annular groove at right angles toboth.

Fig. 8 illustrates a modified form of construction in which the duct 22 between the bore 18 and the annular groove is at the side of the groove instead of in line with the periphery of said groove, and while the firstdescribed construction is preferred the modi fied form might be used with substantially the same beneficial result, and other variations are possible.

In making the oil-well the larger hole 18 is first drilled within the rear wall of the looptaker'a short distance, and the smaller hole with the cover 20, which is secured within the larger hole 18 by soldering or otherwise. It will be observed that the entrance to the thus-covered oil-well points inwardly toward the center of the loop-taker, so that the oil will be thrown out by centrifugal action.

It will be readily understood that the lubricant contained in the packing will by the centrifugal force exerted by the rotation of the loop-taker be held at its outermost diameter of rotation and that when such loop-taker is brought to rest the lubricant will resume its normal position in the packing and escape thence through the duct into the groove 10.

What we claim is'- 1. A bobbin-case receiver, having a lubricant-well, the main body of which is located radially beyond the bobbin-case, so that in the rotation of the receiver the lubricant in the well will be carried away from the receiver by centrifugal action, and having communication with the receiver and bobbin-case to supply them with lubricant when the receiver is at rest.

2. A bobbin-case, combined with a bobbincase receiver having a lubricant-well, the main body ofwhich is located radially beyond the bobbin-case, so that in the rotation of the receiver the lubricant in the well will be carried away from the receiver by centrifugal action, and having communication with the receiver and bobbin-case to supply them with lubricant when the receiver is at rest, and also having a cover provided with an opening for the introduction of packing and oil.

3. The combination with a bobbin-case, of a rotary loop-taker provided with a well to contain oil for lubricating the parts of the bobbin-case that contact with the rotary looptaker, said well having a cover closed toward the periphery of the loop-taker to prevent the escape of oil from said well due to centrifugal action.

4. The'combination with a bobbin-case, of a rotary loop-taker provided with a well to contain oil for lubricating the parts of the bobbin-case that contact with the rotary looptaker, said well formed as a bore arranged transversely in the loop-taker, having an outer funnel-shaped mouth and a cover over said month closed toward the periphery of the loop-taker to prevent the escape of oil from said well when the loop-taker is running.

5. A loop taker for sewing machines, grooved to receive a bobbin-case, and having a lubricant-well arranged in its rear and near the periphery, and communicating with the groove, a cover for said well opening toward the axis of rotation of said loop-taker, and packing material arranged in said well beneath the cover and accessible through said opening.

In testimony whereof We have hereunto set our hands this 17th day of September, A. D.

WILB'UR F. DIAL. GEORGE H. DIMOND.

Witnesses:

J. V. MEEKS, F. W. OsrRoM.

ICC

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