US1931456A - Thread-case for sewing machines - Google Patents

Description

1933- G. A. FLECKENSTEIN 1,931,456

THREAD CASE FOR SEWING MACHINES Filed NOV. 12, 1931 GeoI yc s4- Heckensfez'n Patented Oct. 17, 1933 UNlTED- STATES THREAD-"CASE 7 George A. Fleckenstein, Stratford, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application November 12, 1931 Serial No. 574,578

3 Claims. (01. 112-231) This invention relates to thread-cases around which needle-thread loops are cast by sewing machine loop-takers and has for its object to provide an improved thread-case so formed that the bobbin may be readily and easily removed.

With the above and other objects in view, as

will hereinafter appear, the invention consists in the combination, and arrangement of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art. 15 In the accompanying drawing:

Figure 1 is a rear elevation showing a rotary lock-stitch hook and the improved thread-case in operative relation.

Figure 2 is a substantially central, vertical section of the thread-case, and shows the bobbin in different positions of removal therefrom.

Figure 3 is a perspective view of the threadcase.

The looptaker shown in the accompanying drawing is of the vertical-axis type for cooperation with a reciprocating needle 1. The looptaker, which has a base 2 and is cupped to form a cylindrical side wall 3, is provided with the usual downwardly extending stem 4, the free end of which is adapted to be engaged by the usual hook-driving mechanism of the high speed Singer vertical-axis hook machine. The looptaker is provided with the usual loop-seizing beak I 5 and raceway 6.

The thread-case is cup-shaped, open at its top, and has no post projecting from its base. It is provided with the usual annular bearing-rib 7 which is journaled in the raceway 6 of the book. The thread-case is formed with a bobbin-sup- 40 porting base 8 having an upstanding cylindrical wall 9. The wall 9 is provided in its upper edge and on its rearward side with a finger-notch or recess 10 extending down below the upper flange of the bobbin 11. At a point diametrically opposite the finger-notch 10, the upper and inner edge of the wall 9 is beveled, as shown at 12, so that the upper flange of the bobbin will move over the bevel and readily tilt over the wall when a slight upward pressure is applied to the bobbin at the finger-notch 10.

The. wall 9 of the thread-case below the beveled edge 12 is provided with an inclined thread-slit l3 terminating close to the base 8 in a threadaperture 14. The location of the thread-aperture 14 tends to prevent the bobbin 11 from rising above the thread-case. Secured to the wall 9 by the screw 15 is the usual adjustable tensionspring 16 with its bifurcated end 17 extending over the aperture 18in the wall 9 of the threadcase. The wall 9 of the thread-case has projecting therefrom the usual rotation-restraining lug 19 which engages the throat-plate of the machine (not shown) to prevent the thread-case from rotating.

To remove the bobbin, a slight upward pressure is applied to the upper flange of the bobbin 11 exposed by the finger-notch 10, preferably by the index finger. This causes the upper flange of the bobbin, at apoint diametrically opposite where the pressure is applied, to move over the beveled surface 12, and pass through the three positions A, B, and C, seriatum, asshown in Figure 2. When the bobbin reaches substantially the position indicated at C, it may be firmly grasped by the thumb and second finger and lifted from the thread-case. It will be observed that the thread-aperture 14 is directly under the'beveled edge 12 and diametrically opposite the finger-notch 10, consequently the initial tilting'movement of the bobbin occasions no drawing of the thread through the tensions. Therefore, the tension imposes no resistance to the initial tilting of the bobbin. Furthermore, the slight drag placed on the thread by reason of the posi- .the opposite side of' the thread-case from the operator. This location permits the index finger to be used when tilting the bobbin, thus, facili tating removal.

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

1. In a sewing machine, .the combination with a reciprocatory needle, of a hook-member circularly movable upon a vertical axis, an opentopped thread-case disposed within said hookmember and having an annular side-wall defining a bobbin cavity which is free of projections, and a disk-bobbin having spaced upper and lower thread-confining flanges within said bobbin cavity, the upper edge of the wall of said threadcase being formed with a bobbin-flange-exposing finger-notch, and said upper edge being beveled outwardly substantially diametrically opposite said finger-notch at a point substantially level with the upper flange of the bobbin, whereby the bobbin may be tilted over the edge or said threada stantially diametrically opposite said fingernotch.

3. In a sewing machine, the combination with a reciprocatory needle, of. a loop-taker circularly V movable upon a vertical axis, an open-topped thread-case disposed within said loop-taker and having an annular side-wall defining a bobbincavity which is free of projections, and a diskbobbin within said cavity, the wall of said threadcase having in its upper edge a single bobbinfiange-exposing finger-notch and a diametrically vopposite portion inwardly beveled, and said wall having a thread-aperture at a point below said beveled portion.

GEORGE A. FLECKENSTEIN.

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