US456383A - Signors of one-third to harlan p - Google Patents

Description

6 J. w. RISKS & H. s.- SHAFT.

LOOPER FOR SEWING MACHINES.

No. 456,383. Patented July 21, 1891'.

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JOHN W'. RICKS AND HENRY S. SHAFT, OF GLOVERSVILLE, NE\V YORK, AS-

SIGNORS OF ONE-THIRD TO HARLAN, P. SHUTTS, OF SAME PLACE.

LOOPER FOR SEWING-MACHINES.

SIECIFIGATION forming part of Letters Patent No. 456,383, dated July 21, 1891.

Application filed September 25, 1890- Serial No. 366.170. (ModeL) To all whom it may concern.-

Be it'known that we, JOHN W. HICKS and HENRY S.SHAFT, citizens of the United States, and residents of Gloversville, in the county 5 of Fulton,in the State ofNew York, have invented a certain new and useful Improvement in Sewing-Machines, of which the following is a full, clear, and exact description.

Our invention relates to that class of sewro ing-machines which form alock-stitch through the eo-operation of a revolving hook and under thread and a reciprocating needle and upper thread.

The invention consists ina revolving hook I 5 constructed and arranged substantially as we will proceed now more particularly to point out and finally claim.

In the accompanying drawings, illustrating our invention, in the several figures of which 2 like parts are similarly designated, Figure l is an elevation showing a sewing-machine cloth and throat-plate in section, and also showing in elevation the presser-foot and part of its bar and the needle and part of its bar. Fig. 2 is an elevation of the bobbin-holder detached. Fig. 3 is aplan of the bobbin-holder. Fig. 4 is aside elevation, and Fig. 5 a plan, of the bobbin-case and bobbin. Figs. 6 and 7 show in different elevations the revolving hook. Fig. 8 is a section like Fig. 1, with the hook S broken away to show the barbs in engagement with the loop of needle-thread, and also showing in dotted lines the position of hooks.

In the drawings, a is the cloth-plate.

b is the throat-plate.

c is the presser-foot; d, the presser-bar; e, the needle; f, the needle-bar; g, the needle or upper thread, and h the bobbin or under thread, all substantially of usual or approved construction and arrangement.

The bobbin-holder we prefer to use is constructed with a flange 2', by which it may be 5 screwed to the cloth-plate, and an arm j projects obliquely from this flange and is made with an elbow k, which terminates in a ring Z. A second ring m is hinged at m to the arm j, and this ring has a block miwhich en- 50 gages a spring 02. under stress, so as to be held in whatever position it may be given. The

parts when the loop is discharged from the spring n is secured to the arm j. Therings Z and m are counterparts, and when brought into parallel they are adapted to retain the bobbin-caseo and its contained bobbin p and allow necessary freed om of motion to the bob.- bin-case, while at the same time rendering access to and removal of the bobbin-case at all times easy. The bobbin-case has the tension-spring o and thread-eye 0 and the said case is of circular outline with its rim V- shaped, the rings Z and on being correspondingly beveled to receive it. The bobbin is supplied with an eye p and the bobbin-case with a post 0 ,which enters and engages the bobbin-eye p to secure the bobbin in the case and permit the bobbin to revolve freely within its case. To insert the bobbin-case in the bobbin-holder, the ring m is turned upon its hinge, as indicated by dotted lines in Figs. 2 70 and 3, and then the bobbin-case is laid .upon the ring Z and afterward the ring m turned down into the full-line position shown in said figures.

The revolving hook comprises a collar q, adapted to be applied to the shaft'of the sewing-machine, as by screw (1'. This collar is supplied with the disk face 1', which latter has the flange 0*. Ahooks projects laterally from this flange and then extends substantially parallel with it and may be secured thereto by a screw 8'. A hook 15 also projects laterally from the flange and then extends substantially parallel with it, the barbs of the two hooks being in juxtaposition, but separated by a channel, and the point of the hook 3 being free, while the point of the hook t is buried in the flange. The hook t may be secured to the flange by a screw t. The hook t is arranged between the collar and the hook s.

The relative arrangement of the revolving hook and the bobbin-holder and bobbin-case and bobbin is shown in Fig. l and needs no further description, excepting the suggestion that the hook revolves around the bobbincasein its holder. v

In the operation of our invention the loop of the needle-thread is caught by the barbs of the hooks s and i, and the loop, sliding back overthe points of both hooks,-is spread sufii- ICO ciently to pass over the bobbin-case, and is then carried around to the center and re- 15 aconcealed point, and barbs on the hooks which lie close together and have an intervening channel, substantially as described.

2. In a sewing-machine, a revolving hook composed of a collar and two substantially parallel hooks, one having a free point and the other a concealed point, and barbs 011 the hooks which lie close together and have an intervening channel, substantially as described.

JOIIN NV. RIGKS. HENRY S. SHAFT.

itnesses:

WM. M. HARRIS, JAMES RADFORD.

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