US534835A - Sewing-machine - Google Patents

Description

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JQW. LINGLBY.

SEWING MACHINE.

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' J. W. LINGLEY.

SEWING MACHINE.

No. 534,835. Patented `Peb. 26, 1895.

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PATENT Ormes,

J OI-IN W. LIN GLEY, OF WOLLASTON, MASSACHUSETTS, ASSIGNOR TO THE MERRICK SEWING MACHINE COMPANY, OF PORTLAND, MAINE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 534,835, dated February 26, 1895.

Application nea naar .12, 1 894.

To all whom it may concern:

Be it known that I, JOHN W. LINGLEY, of Wollaston, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Sewing -Machines, of which the following is a specification.

This invention relates to that class of sewing machines especially designed for sewing leather, as uppers of boots and shoes, and employing a reciprocating presser-foot, and a looper having a compound movement.v

One object of the present invention is to provide improved means for elevating the presser-foot which will obviate the objectionable noise heretofore incident to this operation in this class of machines, and which will permit ready adjustment to determine the extent of movement of the presser-foot, and adjustment to determine the time of the presserfoots action.

Another object of the invention is to provide improved means for imparting the coming drawings forming part thereof.

Of said drawings-Figure 1 shows a front elevation of a sufficient portion of a machine having the improvements to illustrate the same. Fig. 2 shows a side elevation of the same. Fig. 3 shows a top plan view. Figs. 4, 5, and 6 are sectional views illustrating the movements of the looper in the formation of a stitch.

It will not be necessary to enter into a detailed description of those parts of the machine not` affected by the present invention, and a simple enumeration of some of them will be sufficient.

The letter, c, designates the awl; b, the

Serial No. 503.305. (No model.)

thread-guide; c, the needle; c', the needle driving shaft, and et the awl-driving shaft.

The presser-foot, d, has its bars, d', in a vertical slide-way, as usual, and is here shown as offset at its upper end, (see dotted lines in Fig. 2) to form a horizontal shoulder, d2. A dat spring, d4, bears on the upper end of the bar over the said shoulder, and impels the presser-foot downward.

A pair of spread arms, c, and c', are pivoted on a stud, e2, fastened in a fixed bracket, e3, and are connected together by a screw, e4, whose turning varies the distance of the arms apart, the said arms constituting a lever.v The lowerarm, e, extends under the shoulder, d2, and the upper arm, e', extends over the shaft, a. The latter carries a cam,f, to act on said arm, e', and elevate the presser-foot by the arm, c, acting against the shoulder, d2. It will be seen that this construction obviates the noise caused by the striking of an arm on the awl bar against an abutment on the presserfoot bar, the arrangement. now in vogue.

The screw, e4, provides very convenient means for regulating the extent of movement of the presser-foot. The cam,f, is adjustable to change its time, said cam being capable of turning on the shaft, d', and carrying a screw, f', which extends through a slot, f2, in the awl-driving crank, a2. Check screws, f3, entered in opposite sides of said crank abut the screw, f. By this arrangement the time of elevating the presser-foot may be regulated.

The looper, g, is fastened to an arm, g', which has a straight longitudinal slot, g2, receiving a pivot, g3, supported by the vibrating needle-frame, c2. A disk, g4, afxed on the shaft, c', has a cam groove, g5, which receives a roller on the lower end of the arm, g', and produces lateral vibrations of the looper. The said disk, g4, is formed with another cam-groove, QG, which receives a roller on a pivoted horizontal arm Q7, whose free end is connected by a link, g8, with the arm,

g. Through these connections the looper receives vertical reciprocation.

The loopers movement is best illustrated in Figs. 4, 5, and 6. When the loop, 2, has been brought down by the needle the looper is moved laterally to the right and into the loop which it spreads. Then as the needle ascends the looper also ascends, holding the loop While the needle goes up through the Work and comes down with the next loop, 3; and the looper moves laterally out of the loop and out from in front of the needle as the latter descends, so that it is entirely withdrawn from the loop before the latter is taken up, and hence, the thread is not subjected to strain to cast it off the looper as heretofore. After having thus moved laterally the looper descends to its first position in time to enter the new loop, 3.

It will be seen that by the means shown and described an accurate movement of the looper is assured.

A cam for vibrating the looper in addition to the cam for vertically reciprocating it isa more reliable arrangement than that of an angular slot in the looper arm and a single cam for operating the latter, and has the advantage of providing for lateral movement distinct from the vertical movement and vice versa, whereas with the angular slot one movement is produced by the other, and the lateral and vertical movements are not distinct but the motion of the looper is in an oblique direction and the loop is cast off the looper While the latter is in front of the needle, and therefore, the thread has to be put under strain to force it off the end of the looper.

Another advantage of a distinct lateral movement of the looper is that its end can be formed to extend on a greater angle to more securely hold the loop while in the same, and no auxiliary means for holding on the loop are needed, as heretofore.

I-Iaving thus explained the nature of the invention and described a way of constructing' and using the same, though without attempting to set forth all of the forms in which it may be made or all of the modes of its use, it is declared that what is claimed isl. In a sewing machine the combination of a looper, an arm supporting the same and having a straight slot embracing a pivot-pin, on which said arm vibrates a disk on the needle driving-shaft having a pair of cam-grooves, one receiving a roller on said arm and adapted to produce lateral vibration of the same, a horizontal pivoted arm carrying a roller in engagement with the other cam-groove, and a link connecting said arm with the looperarm whereby vertical reciprocations of the latter are produced,

2. In a sewing machine the combination of a vertically movable presserfoot and bar, a pairof concentrical-ly pivoted arms connected together by an adjustment screw, oneof said arms extending :under a shoulder on the presser-foot bar, and a cam on the awl driving-shaft arranged to act against the other arm to elevate the presser-foot.

3. In a sewing machine the combination of a vertically movable presser-foot and bar, a lever for elevating the same, a cam on the awl-shat`t co-acting with said lever and movable on said shaft, aslotted aWl-driving crank on the shaft and receiving a screw fastened in the cam, and carrying check-screws to bear against said screw, an awl operatively connected with said crank, and a needle and needle reciprocating means.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 28th day of February, A. D. 1894:.

JOHN V. LINGLEY.

Witnesses:

C. F. BROWN, F. P. DAvIs.

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