US2325467A - Sewing machine - Google Patents

Description

July 27 1943- w. K. R. lar-:YER `2,325,467`

SEWING MACHINE .Filed May 24, 1940 IN1/EN TORJ WERNER KURT Rana/f BEYER Patented July 27, 1943 SEWING MACHINE Werner'Kurt Rudolf Beyer, Dresden, Germany; vested in the Alien Property Custodian Application May 24, 1940, serial No. 236,944

6 claims. y (CL112-192) This invention relates to a sewing machine for family use with a new improved means for actuating the oscillating shuttle.

The device consists of a driven cam, the cam carrier of which rotates. This cam changes the rotating motion of the sewing machine drive shaft into the reciprocatory motion required for the shuttle bymeans of a rocker which is connected to the shuttle by means of a rod.

Devices for shuttle motivation already known generally employ cam or crank driven power which often becomes noisy because of the high acceleration at the points where the motion reverses, and on account of the necessary joints of the up and down moving rod. Compared with such devices this present invention provides a shuttle motive-power, which moves the system of rods connected with the shuttle in a vertical plane. Thus the speed of the driven parts can be regulated at will at different points of their paths and results in an extremely even and noiseless motion.

This invention has at the same time the advantage, contrary to other known devices which employ cams of comparatively small size so that it can be mounted almost anywhere in the path of motion. of the shuttle drive.

This brings about another advantage, namely, that it can be built into any lock stitch sewing machine, whereas devices with cam gears can be used only with chainstitch sewing machines in which the loopcatcher travels only short distances.

One form of the invention is shown by the accompanying drawing of which Fig. 1 shows a longitudinal section through the machine illustrating the shuttle actuating mechanism,

Fig. 2 shows the shuttle of the machine.

On the bedplate I of the sewing machine is mounted the arm 2. In the lateral part of the arm 2 is lsituated the'main shaft 3. On this shaft 3 is fastened a bevel gear 4 which engages another bevel gear 5 which is fastened to the upper end of a perpendicular connecting shaft 6. This perpendicular connecting shaft is within the perpendicular part of the arm 2 and rotates in two bearings 1 and 8. At the lower end of shaft 6 is fastened a revolving part 9 in the shape of a segment of a hollow sphere. The surface I0 of which cuts the axis of the perpendicular connecting shaft 6 at an acute angle.

Below the center of the revolving part and in this case in the center of the curve of the segment of the hollow sphere is a, shaft II supported by JIA two bearings I2 and I3. (The bearing I3 is not shown in the drawing). These bearings are parts of a frame I4 which is held to the bottom of the bedplate I by screws. Between the-bearings I2 and I3 is a T-shaped swinging part or rocker I5 -having at its two lateral ends I6 and I1 small rollers I8 and I9. 'I'hese rollers I8 and I9 ride on the surface I0 of the revolving part 9. From the center of the rocker I6 between the two arms I6 and Il extends at a right angle a third arm 20. At the end of this arm 20 is jointed a rod 2| which is provided at its free end with a rack 2Ia. Rack 2Ia slides to and fro in the extensions 23 and 24 of a hanger 22 loosely suspended from an axle 25 for the shuttle. Between the lateral bearings 23 and 24 is a pinion 26 or the segment n of a, pinion which is fastened to the axle 25.

Axle 25 for the shuttle is supported in a bearing 21 which is cast as a part ofthe bedplate I.

To the free end of the axle 25 for the shuttle is fastened the driving device 28 with the shuttle 29. In the shuttle. 29 is the ordinary bobbin case 30 and bobbinl. The bearing 22, the pinion 26, the axle 25 for the shuttle, the driving device 28 'and the shuttle 29 are a unit in a housing 32. This housing 32 with the bobbincase 30 and the bobbin 3| is closed by means of a ring 33 which is fastened to the frontal part of the housing 32 by means of a screw 34 under which a springplate 33a presses against the ring 33. This ring 33 preventsthe shuttle 29 from falling out of the housing.

For the driving of the sewing machine a driving wheel equipped with a belt-groove 6I is mounted on the free end of the main shaft 3. At the opposite end of the main shaft 3 is an eccentric crank 62, firmly attached to which is a peg 63 having a lateral projection into which a second peg 64 is screwed. To this peg 64 is attached a lever 65. To the other end of this lever 65 is mounted a clamp 66 which passes tightly around the needle bar 61. The take-up lever 68 is movably mounted on the peg 63. A lever 69 is connected with the take-up lever 68. This lever 69, which is movably mounted on bolt 'IIJ fastened into the frame of the machine, serves to guide the take-up lever 68.

Having described my invention, I claim:

1. In a household sewing machine the combination of a bedplate, an arm mounted on this bedplate, a main driving shaft in this arm, a perpendicular connecting shaft, means to transmit the motion of the said main driving shaft to the connecting shaft, a segment of a hollow sphere attached to the lower end of the perpen-v dicular shaft, said segment having a surface which cuts the axis of the perpendicular shaft at an acute angle, transforming meansto convert the revolving motion of said segment into a to and fro motion, an oscillating shuttle, a rod driven by the said transforming means, and a device at the end of the said rod to oscillate said shuttle.

2. In a household sewing machine a bedplate, an arm mounted on this bedplate, a main driving shaft in this arm, a perpendicular connecting shaft, a pair of bevel gears to transmit the motion of the said main driving shaft to the perpendicular connecting shaft, a revolving part attached to the lower end of this perpendicular connecting shaft in the shape of a segment of a hollow sphere which segment has a surface which cuts the axis of the perpendicular connecting shaft at an acute angle, a swinging part in the shape of the letter T, a frame fastened to the under-side of the bedplate with means for holding the swinging part, means at the lateral ends of the said swinging part which means travel on the surface of the segment of the hollow sphere, a rod driven by the said swinging part, an oscillating shuttle, and a device at the end of the said rod to set in motion the oscillating shuttle. v

3. 1n a household sewing machine a bedplate, an arm mounted on this bedplate, a main driving shaft in this arm, a perpendicular connecting shaft, a pair of bevel gears to transmit the motion of the said main driving shaft to the perpendicular connecting shaft, a revolving part at the lower end of this perpendicular connecting shaft in the shape of a segment of a hollow sphere which segment has a surface which cuts the axis of the perpendicular connecting shaft at an acute angle, a swinging part in the shape of the letter T, a frame fastened to the underside of the bedplate with means for holding the swinging part, rollers mounted at the lateral ends of the said swinging part, which rollers travel on the surface of the segment of the hollow sphere, a rod driven by the said swinging part, an oscillating shuttle, and a device at the end of the said rod to set in motion the oscillating shuttle.

4. In a household sewing machine a bedplate, an arm mounted on this bedplate, a main driving shaft in this arm, a perpendicular connecting shaft, a pair of bevel gears to transmit the motion of the said main driving shaft to the perpendicular connecting shaft, a revolving part at the lower end of this perpendicular connecting shaft in the shape of a segment of a hollow sphere which segment has a surface which cuts the axis of the perpendicular connecting shaft at an acute angle, a swinging part in the shape of the letter T, a frame fastened to the underside of the bedplate with means for holding the swinging part, rollers mounted at the lateral ends of the said swinging part which rollers travel on the surface of the segment of the hollow sphere, a rod movably connected with the perpendicular part of the T-shaped swinging part which rod has a rack at its free end, a shuttle and a pinion engaging said rack for oscillating said shuttle.

5. In a household sewing machine a bedplate, an arm mounted on this bedplate, a main driving shaft in this arm, a perpendicular connecting shaft, a pair of bevel gears to transmit the motion of the said main driving shaft to the perpendicular connecting shaft, a revolving part at the lower end of this perpendicular connecting shaft in the shape of a segment of a hollow sphere which segment has a surface which cuts the axis of the perpendicular connecting shaft at an acute angle, a swinging part in the shape of the letter T, a frame fastened to the under side of the bedplate with means for holding the swinging part, rollers mounted at the lateral ends of the said swinging part which rollers travel on the surface of the segment of the hollow sphere, a rod movably connected with the perpendicular member of the T-shaped swinging part which rod has a rack adjacent its free end, a shuttle and a pinion engaging with said rack adapted to impart an oscillating motion to the shuttle.

6. In a household sewing machine, the combination of a bed-plate, an arm mounted on the bed-plate, a main driving shaft in said arm, a connecting shaft, means to transmit the motion of the main driving shaft to the connecting shaft, a cam attached to the lower end of the connecting shaft, a rocker provided with arms for engaging said cam, a crank swingable in a vertical plane on said rocker, a rod, one end of which is pivotally attached to said crank, a rack on the other end of said rod, a pinion meshing with said rack, and a shuttle attached to said pinion so as to be rotatable therewith.

WERNER KURT RUDOLF BEYER.

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