US1758715A - Loop taker for sewing machines - Google Patents

Description

May 13, 1930. w. N. PARKES 8,

LOOP TAKER' FOR SEWING MACHINES Filed Aug. 11. 192'! INVENTO R William Mfianfa Patented May 13, 1930 UNITED STATES PATENT OFFICE WILLIAM NELSON PABKES, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY LOOP TAKER FOR SEWING MACHINES Application filed August 11, 1927. Serial No. 212,175.

This invention relates to improvements in sewing machine loop-takers employed for casting loops of needle-thread around a mass of under-thread in the formation of lockstitches.

The present invention aims to increase the efliciency of sewing machine loop-takers operated at high speed and attains this object by the provision of a bobbin-carrier having means auxiliary to the usual loop-taker beak for rapidly spreading the needle-thread loop preparatory to casting it about the bobbincarrier, combined with means providing a minimum of friction for the bobbin within its carrier.

According to the present embodiment of the invention, a loop -taker of the vertical-axis type is provided at its top with an internal raceway in which is ournaled the peripheral bearing rib of a bobbin-carrier. The bobbin-carrier is open at its top and is substantially bottomless, having only a narrow internal flange at the bottom of its side walls for supporting the bobbin. The flange referred to comprises a flat, narrow ring which may be secured by soldering or welding to the bottom of the bobbin-carrier wall and constitutes the base of an auxiliary hook disposed between the loop-taker and bobbincarrier walls for cooperation with the looptaker beak in the rapid spreading of the needle-thread loops. This construction obviates the employment of the friction-inducing bobbin-post and bobbin-carrier base heretofore employed in loop-takers of the present type and provides for a more efficient control of the needle and bobbin-threads.

In the accompanying drawings, Fig. 1 is a central, sectional elevation of a loop-taker containing the present improvement. Figs.

'2 and 3 are perspective views of the component body-members of the loop-taker proper. Fig. 4 is a perspective view of the bobbin-carrier and Fig. 5 is a similar view of the bobbin-carrier auxiliary-hook and its base-ring. The embodiment of the present loop-taker in a sewing machine is shown in my application Serial No. 212,172 filed simultaneously herewith and designated Case A.

The loop-taker illustrated in the accompanying drawings is of the vertical axis type cooperating with a reciprocatory needle, as 1, in the formation of lock-stitches and comprises a base or inner body 2 cupped to provide a cylindrical wall 3 having at its upper riman internal flange 4-. Closely embracing the outer periphery of the wall 3 is the cylindrical wall of an outer loop-taker body 5, secured by screws, as 6, upon said inner body and also provided at its upper rim with an internal flange 7. The flange 7 is spaced above the flange 4 to form therewith a cylindrical raceway 8 for a bearing-rib 9 provided on the outer and upper periphery of a bobbin-carrier 10. The bobbin-carrier 10 is open at its top and is provided at its bottom with a narrow internal flange 11 upon which rests a bobbin 12 of any suitable construction. The flange 11 is provided on the bobbin-carrier by securing to the bottom edge thereof, as by soldering or welding, a flat-ring constituting the base of an auxiliary hook 1 1 inclined upwardly toward the bearing-rib 9 between the bobbin-carrier wall and the loop-taker inner-body wall.

The bobbin-carrier bearing-rib 9 is interrupted to provide a thread-clearance gap 15, said rib terminating at one end in a loop-arresting shoulder 16. Above the bearing-rib 9 and adjacent to said gap 15 the bobbin-carrier wall has a notch 17 adapted to be entered by a stationary stop-lug (not shown) to restrain the bobbin-carrier against rotation with the loop-taker and is also provided above and adjacent the shoulder 16 with a loop cast-off 18. The outer loop-taker body has a beak 19 adapted to seize the loops of thread presented by the needle 1, the inner limb of each of the loops thus seized being deflected by a nose 20 on the inner loop-taker body into engagement with the shoulder 16, which retains the upper portion of said limb in the bearing-rib gap 15. Almost immediately thereafter the thread-loop engages the auxiliary hook 14 and is rapidly spread thereby toward the bottom of the bobbin-carrier while the outer limb of the thread-loop is thereafter cast over the top of the bobbin-carrier by the continued advance of the loop-taker beak.

It has been found in practice that in a loop taker constructed as described, there is a natural tendency for the bobbin to rotate in a direction opposite to the direction of rotation of the loop-taker, a condition influenced materially by the minimum of friction on the bobbin provided by the present bobbin-carrier. The bobbin is placed in its carrier to unwind in the direction of rotation of the loop-taker and therefore the tendency of the bobbin to rotate in the opposite direction induces a taut condition of the bobbinthread which promotes the efficiency of op eration of the machine.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, a reciprocatory needle, a vertical-axis rotary loop-taker hav- 1 ing a loop-seizing beak cooperating with said needle in the formation 01" lock-stitches, a bobbin-carrier 3ournaled within said looptaker having a centrally open base constituted by a narrow internal flange projecting inwardly from the bottom of the bobbincarrier side wall, an auxiliary loop-spreading hook projecting upwardly from the base of said bobbin-carrier between the side walls of the loop-taker and bobbin-carrier, and a bobbin sustained within the bobbin-carrier upon its base flange.

2. In a sewing machine, a reciprocatory needle, a vertical-axis rotary loop-taker having a loop-seizing beak cooperating with said needle in the formation of lock-stitches, a

bobbin-carrier journaled within said looptaker provided with a loop-spreading hook disposed between the side walls of the looptaker and bobbin-carrier, a narrow ring se-' cured to the bottom of the bobbin-carrier Wall to provide an inwardly extending base-flange,

said hook projecting from said ring, and a bobbin sustained Within the bobbin-carrier upon said base flange.

In testimony whereof, I have signed my name to this specification.

WILLIAM NELSON PARKES.

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