US530297A - Sewing-machine - Google Patents

Description

(No Model.) 2 Shezts8heet 1.

J. B, BERTRAND, SBWINGMAGHINB.

'No. 530,297. 3 Pate'nt ed Dec. 4, 1894.

Wimasses: Iqventar: M z I JosephEb/BerbrmwL,

' J.'E. BE-JRTRAND.

2 Sheets-Sheet 2 (No Model.)

SEWING MACHINE. No. 530,297.

Patented Deo. 4, 1894 Inventor: JosephEliBerlrand,

Vl ibwses: M 6 K t/W4. MM m UN Iran STATES LATENT nmo t).

JOSEPH ELI BERTRAND, OF-BOSTON, ASSIGNOR on ONEJHALF TO MELLEN BRAY, OF NEWTON, MASSACHUSETTS.

SEWING-MACHINE.

IEEEGIFICATION forming part of Letters Patent No. 530,297, dated December 4, 1894.

Application filed May 29, 18 94- Serial No. 512,842- (No model.)

432,011, granted to me July 15, 1890, and in another application of mine filed December 21, 1893, Serial No. 494,282, and it consists in certain novel features of construction, arrangement and combination of parts which will be readily understoodby reference to the description of the accompanying drawings and to the claims hereto appended and in which my invention is clearly pointed out.

Figure 1 of the drawings is a front elevation of so much' of a sewing machine as is necessary to illustrate my invention, with the presser-foot resting upon the work support as when there is no work in the machine, the

needle in its uppermost position, the looper I finger at the extreme of its forward position, and the thread carrier in position for its open hook to receive the thread when the loop forming finger moves toward the rear. Fig. 2 is a side elevation of the needle and awl carrying arm, the needle, awl, loop measuring finger, stationary thread guide and the thread carrier, with work in position the looper finger moved to the rear, and the thread carrier having been partially rotated to throw the thread into engagement with the barb of the needle. Fig. 3 is a front view of the needle arm, needle, work support, presser foot, stationary thread guide, and the thread carrier, said carrier with its hook being in a position between'that shown in Fig. 1 and that shown in Fig. 2. Fig. 4. is a similar view of the same parts with the thread carrier and looper finger in the same position as in Fig. 2. Fig. 5 is a front elevation of the same parts, with the thread carrier at the extreme of its rotation toward the right and rear of Fig. 1, the needle having been moved downward and the loop measuring finger moved toward the front. Fig. 6 is a similar view showing the parts in the several positions they occupy when the needle has drawn the loop of thread downward through the work support. Fig. 7 is a sectional plan showing the parts in the same positions as in Fig. 1. Fig. 8 is a similar View with the several parts in same positions as in Fig. Fig. 9 is a similar view with the several parts in the same positions as in Fig. 4. Fig. 10 is a similar view with the several parts in the same positions as in Fig. 2. Fig. 11 represents the same parts in plan with the several parts in substantially the same positions as shown in Fig. 5. Fig. 12 is a like .view. with the several parts in substantially the same positions as shown in Fig. 6, and Figs. 13 and 14 are respectively a plan and an elevation of the thread carrier and its take up arm detached from the machine.

In the drawings A represents a small portion of the bed of the machine head and U a small part of the tie girt between the end frames. Not shown.

G and G2 are the two stands for supporting theneedle and awl carrying shaft 1) and the shuttle race G M is the shuttle; d, the needle and awl carrying arm; 0, the needle; d, the awl; j, the work support; Z, the presser-foot, and Z the presser-foot-bar; K, a portion of the lever for lifting the presser-foot by hand; It, the thread carrier shank provided with the open hook 70 for engaging the thread and carrying it into engagement with the barb of the needle as described in my before cited pending application, and g the loop measuring finger. i The presser foot Z has a slot Z cut through it from front to rear to receive the front end ofthe upper needle support on substantially as in the Letters Patent N 0. 502,873, granted to me August 8, 1893.

A stationary thread eye 6 is secured to some fixed part of the machine, and the needle thread after passing over the guide roll n passes through the guiding eyee and thence to the work. p p

The parts of the machine not shown in the present drawings are constructed, arranged and operate substantially as in the pending I IOO tion has its center line in adifierent plane to the axis of its upper portion, about which said lower portion is made to oscillate to the extent of about five-eighths of a revolution more or less, and has set in its lower portion near its end the curved wire hook projecting therefrom in such a manner that when the carrier shank is rotated about its axis said hook will engage the needle thread and carry it around the needle and cause it to engage the barb of the needle substantially as in said prior application.

It has been found that, in practice, when the needle descends to draw the loop of thread through the work and one strand of the loop is held by the eye or hook of the thread carrier and the other strand extends from the needle hook to the loop measuring hook, the thread between said needle and loop measuring hook will sometimes become sufficiently slack before the barb of the needle reaches and enters the work to nearly disengage the loop from the barb and when the barb enters the work it is very liable under such circumstances to partially sever the thread or at least seriously injure it.

To overcome this defect in the operation of the machine is the object of my invention and to that end I insert in the lower end of the thread carrier shank is directly opposite the hook it an auxiliary arm a made of round wire and curved both vertically and horizontally as shown in Figs. 18 and 14.

The thread carrier shank 70 has the same movements imparted thereto and in the same manner as in my before cited Letters Patent and in the pending application hereinbefore referred to.

The operation of my invention is as follows: When in the operations of the machine the loop measuring finger is moved from its extreme forward position, as shown in Fig. 7,-

to its rearmost position, as shown in Fig. 8, its hook engages the thread 2 between the presser foot and the fixed thread eye 6 and carries it toward the rear to draw out the required length of thread to form the loop for the passage of the shuttle when said loop has been drawn below the work. In moving toward the rear the loop measuring hook causes the portion of the thread above said hook to be brought into engagement with the hook it which at that time occupies the position shown in Fig. 7. When the loop measuring finger has completed its rearward movement and the needle has reached the extreme of its upward movement, the thread carrier is rotated about its axis in the direction indicated by the arrow on Fig. 7 the hook it carrying the thread 2 around the front side of the needle and laying it into the hook or barb of the needle as shown in Figs. 3, t, and 9.

When the thread has been carried around the needle sufficiently far to' insure its engagement with the barb of the needle the outer end of the arm a, which is curved downward to a lower level than any other part of said arm, passes beneath the upper strand of the loop of thread drawn out by the loop measuring finger g, as shown in Fig. 9, and as the thread carrier continues to move about its axis in the some direction the arch like upwardcurve of the arm a raises said strand so as to take up any slack there may be in the thread and draw it closely into the notch of the needle, beneath the barb, and maintain it there with some tension, so that when the needle descends to draw down the loop of thread, and the looper finger moves toward the front to permit said loop to be drawn down, the 'two strands or parts of said loop are inclined at the same angle and have substantially the same tension, and that suflicient-to preclude any possibility of the bight of the loop getting beneath the sharp point of the barb of the needle and being out or injured thereby.

-What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a sewing machine, the combination with a hooked or barbed needle, and a loop measuring finger, of an oscillating thread carrier shank having an open hook to engage the thread and carry it into engagement with the barb of the needle; and an auxiliary arm set in said shank, opposite said hook, and having its upper side curved or cam shaped with its outer or free end lower than its center portion, whereby said auxiliary arm is adapted to pass under and raise the upper strand of the loop, drawn out by the loop measuring finger, when said carrier is moved about its axisto throw the thread into the barb of the needle.

2. In a sewing machine, the combination with a barbed needle and a loop measuring finger, of a vertically arranged and intermittently oscillating thread carrier for carrying the thread into engagement with the barb of the needle; and an arm carried by, and projecting laterally from, said carrier, and having its upper side curved or cam shaped with its'"outer or-free end lower than its center portion,whereby said arm is adapted to operate substantially as and for the purpose described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 23d day of May, A. D. 1894.

JOSEPH ELI BERTRAND.

Witnesses:

N. C. LOMBARD, H. T. CROSBY.

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