US1741179A - Sewing machine - Google Patents

Description

y Dec. 31, 1929. I E. ANGST 1,741,179

SEWING MACHINE Filed April 6, 1927 2 Sheets-Sheet 1 Dec. 31, 1929. E. ANGST 1,741,179

SEWING MACHINE Filed April 6. 1927 2 Sheets-Sheet 2 22 FY 96 I Ha. 21 K 7 31 I 23 a4 .74 J

Patented Dec. 31, 1929 UNITED STATES.

EMIL ANGST, OF SEEBACH, NEAR ZURICH, SWITZERLAND SEWING MACHINE Application filed April 6, 1927, Serial No. 181,573, and in Switzerland March 2, 1927.

The subject matte r of the present invention is a sewing machine provided with a shuttle or spool carrier rotating in one direction having a hook at its circumference for catching the upper thread, the loop of which can be carried around theshuttle for intersecting the lower thread as the turning motion is imparted to the shuttle by means of driving members relieving each other in their action for the purpose of obtaining a useful space in the shuttle that is as large as possible for taking up the thread.

In this manner the interruptions in the seW- ing caused by the replenishing of the sewing thread may be cut down to a minimum amount.

A constructional example of the subject matter of the present invention is illustrated on the accompanying drawings, in which Fig. 1 is an elevation with parts shown in section of the sewing machine; the lower supporting part being omitted;

Fig. 2 is a plan view of Fig. 1 seen from below;

Fig. 3 is an end elevation with parts shown in section and seen from the left hand side of Fig. 1;

Figs. 4 and 5 show on a larger scale and in perspective views the shuttle and,

Fig. '6 is a section through a detail of Fig. 5;

Fig. 7 shows a further detail in two views;

Fig. 8 shows the casing containing the shuttle with the cover in the opened position;

Fig. 9 shows this casing in a vertical section;

Fig. c;

Figs. 11 and 12 area vertical and a hori- 40 zontal section respectively through thefree end of the gooseneck of the sewing machine. In the gooseneck 1 of the machine the shaft 2 is arranged which is provided with a driving pulley 3 and transmits its movement by 45 means of a bevel gear 4, a shaft 5 and a bevel 10 is a horizontal section of the casgear 6 to a shaft 7;. The shaft 7 arrangedbe- 3 low the plate 8 of the machine causes the drive of the shuttle 9, which is enclosed in a casing 10 fixed by means of the twoarms 11 (Figs. 2 and 9) to the plate 8. The casing, 10 is accessible after the hinged lid 12 is turned and the latter is held in its closed position by means of resilient fingers 13 engaging with projections on the casing.

The shuttle 9 represents a rotary shuttle' and is provided with an exterior rib 14 extending over the greater part of its circumference. By means of this rib the shuttle 9 is rotatably mounted on anti-friction bodies such as little rollers 15 arranged in the casing 10 so that the shuttle can be easily rotated. The rollers15 are secured by a ring 16 in bores provided in the casing 10 and forming bearings for the rollers above which they project slightly with their circumference. One end of the rib 14 of the shuttle is pointed at 17 and serves for catchin the upper thread. On the part of the circumference of the spool carrier 9 above which the rib 14 does not project a slot 18 is provided permitting the needle 19' which is fixed to the needle-bar 1 9 and supplies the upper thread to enter so that this travel necessary for forming the loop of the upper thread to be presented to the point of hook 17 is unobstructed. On the central pin 20 of the shuttle 9 the thread spool 21 is loosely placed whilst on the reduced free end of this pin the cover 22 appertaining to the shuttle is placed by means of a centrally arranged nave. The cover 22 is held in the axial direction by means of a plate spring arranged on the lid 12 of the casing and a rotation of the cover is prevented by an arm :34

secured to the cover 22 projecting into a notch of the ring 16. The arm 24 is provided with a knob 25 and may be displaced in a radial inward direction against the influence of a spring 26 (Figs. 6, 8) arranged in the cover 22, for the purpose of inserting and removing the cover when exchanginga spool. The

cover 22 is provided with a recess 27 (Fig 5) for the passage of the needle 19, further this cover has an eye 28 for drawing OK the underthread supplied by the spool 21, the thread being then conducted through a groove 30 of the cover 22, and a braking spring 29 acts on the thread in the groove.

The shuttle 9 is caused to take part in the rotation of the rotating shaft 7 by the action of two spring retracted coupling pins 31 mounted in a head 32 fixed to the shaft 7. The springs of the pins 31 act by abutting by means of balls 33 on a cam path 34 provided on a stationary disc 35 (Figs. 7, 9 and 10).

By the action of the cam path 34. the pins 31 are endwise and periodically displaced towards the shuttle carrier 9 and against the influence of the springs so that they penetrate alternately into holes 36 (Fig. 4) providedon the carrier 9 and cause thereby the rotation of the latter whereby they relieve each other alternately as driving agents. On account of the periodically and alternately occurrlng re turn movement of the coupling pins 31 into their initial position the loop of the upper thread to be engaged by the lower thread and caught by the hook 17 of the spool carrier 9 may be passed through by the shuttle.

The upward and downward movement of the needle bar 19 is effected by a lever 37 mounted on a stationary pin 38 and project ing in between rollers 39 arranged on a carrier 39 fixed to the needle bar 19. To the lever 37 movement is imparted by means of a cam body 40 fixed to the driving shaft 2, a roller 41 on the lever 37 cooperating with the cam groove 42 of this cam body. The cam body 40 is further provided on its end face with a cam facing 43 against which a roller 46 of the thread pulling lever is pressed by the influence of a tension spring 47.

The upper thread is supplied by a spool 48 (Fig. 1) which is similar to the spool 21 inserted in the shuttle 9 so that one type of spool suflices, however, spools of different length of thread, of for instance 1001000 yards may be used. The spools carrying the thread, which are preferably made of a light metal (for instance aluminium), may thus be used desired.

The upper thread is threaded through an eye 49 provided on the gooseneck 1 and led over a brake 50 known per se and through a hole of a row of holes provided on the lever 45 from which it passes to the needle bar 19 and to the needle 19.

51 denotes the presser-foot and 52 the feed dog (Fig. 3). The latter receives its feeding movement from a lever 54 arranged on the shaft '53, a connecting rod 55 cooperating with an eccentric 56 on the shaft 7 being linked to the lever 54. The upward and downward movement of the feed (log '52 is imparted to the latter by means of an "arm 58 In order to permit an alteration of the 7 feed motion of the feed dog and thereby of the length of the stitch, the point at which the connecting rod 55 acts on the lever 54 may be adjusted. To this end serves a bellcrank lever 63 connected by means of a link 62 to the connecting rod 55, the bell-crank lever 63 being adjustable by means of a knob 64 screwed to one arm of the lever 63 and displaceable along a curved scale 65, the knob 64 engaging with said scale 65 for fixing the lever 63 in its adjusted positions.

The obviation of superfluous parts which take up much room, permits a large useful space for the thread in the shuttle, i. e. the latter may carry a large supply of thread. Obviously the construction of the sewing machine may be modified as regards details without departing from the spirit of the invention.

I claim:

1. In a sewing machine, a stationary shuttle casing, a hinged lid therefor, a series of antifriction members mounted in the casing, a ring for retaining the members in the casing, a shuttle, an external flange thereon supported by said members partly surrounding the shuttle and having a thread engaging hook, a needle slot in the shuttle adjacent the flange, a removable cover'for the shuttle, a latch thereon engaging said ring to hold the cover stationary, a spring on said lid to hold the cover in position, and driving means for the shuttle. I

2. In a sewing machine, a stationary shuttle casing, a hinged lid therefor, a series of antifriction rollers mounted in and projecting from bores in the casing, a retaining ring in the casing engaging the ends of the rollers, a shuttle, an external peripheral flange on the shuttle supported on said rollers and extending partly around the shuttle, said shuttle having a peripheral needle slot adjacent the flange, a removable cover for the shuttle, a latch thereon engaging said ring to hold the cover stationary, a leaf spring extending across the lid and holding the cover in position, and driving means for the shuttle.

3. In a sewing machine, a rotary shuttle having a bobbin recess therein and a smooth cover entirely covering the recess in the shuttle, means to latch the cover to the shuttle against rotary movement, a casing for the shuttle, a closure for the shuttle casing and a spring on the closure pressing against the cover to hold it against axial movement.

4. In a sewing machine, a rotary shuttle having a bobbin recess therein and a smooth cover entirely covering the recess in the shuttle, means to latch the cover to the shuttle against rotary movement, a casing for the shuttle, a closure for the shuttle casing, a spring on the closure pressing against the cover to hold it against axial movement, and means to positively connect and disconnect the shuttle at tWo points to the shuttle casing during each rotation to permit the unobstructed sliding of the loop of thread over the shuttle.

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

EMIL ANGST.

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