US2461504A - Electric transmitter for driving sewing machines and the like - Google Patents

Description

Feb. 8, 1949. E. P. TURNER 2,451,504

ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Filed Nov. 3, 1947 3 Sheets-Sheet l INVENTUB. 5a gaz (P 74mm: WITNESS. BK I AYY'OPNEY Feb. 8, 1949. E. P. TURNER 2,461,504

ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Filed Nov. 3, 1947 3 Sheets-Sheet 2 Q x Q g L S,

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E. P. TURNER 2,461,504 ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Filed Nov. 3, 1947 3 Sheets-Sheet 3 WE. cgyaz Q Uuwzaz WITNESS, BX

(fl/ %42aa@ ATTORNEY Patented Feb. 8, 1949 ELECTRIC TRANSMITTER FOR DRIVING SEWING MACHINES AND THE LIKE Edgar P. Turner, Fanwood, N. J asslgnor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application November 3, 1947, Serial No. 783,791 12 Claims. (01. 172-36) This invention relates to electric transmitters or motor-clutch drives for sewing machines and the like, the motor being an electric motor with a stationary stator surrounded by a rotor which acts as the driving element of the clutch.

One of the objects of this invention is the provision of a motor of the above type which has a minimum overall length and which is compact and may be placed beneath a sewing table without undue interference with the knees and legs of the operator. To this end the driven shaft extends through the hollow motor shaft and is manually shiftable endwise for the purpose of engaging and disengaging the clutch.

Another object of this invention is to provide an improved brake-ring support which may be readily adjusted and clamped in set position within the motor casing.

Another object of this invention is to provide an improved casing for a motor of the inverted type which is in the shape of a cup and through the open end of which the motor may be readily assembled and disassembled, the casing being partially split so that a brake supporting ring can be clamped in the open end.

Another object of this invention is the provision of improved means for resiliently pressing the driven disk of the clutch against the brake, together with means for adjusting the pressure of the driven element against the brake when the manual control lever is released.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings 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.

In the drawingsa I Fig. 1 is a top plan view of a motor-clutch drive embodying my invention.

Fig. 2 is a longitudinal vertical sectional view taken substantially through the center of the motor-clutch drive shown in Fig. 1.

Fig. 3 is a reduced left end elevation of the motor-clutch drive shown in Fig. 1.

In the embodiment of my invention selected for illustration, my improved electric transmitter or motor-clutch drive comprises a hollow cylindrical cup-shaped casing in formed with attaching feet i l on its outer surface. Diametrically opposite the feet H, the open end of the casing III is split at l2 and on opposite sides of the split the rim portion is formed with clamping lugs 13 which are apertured to receive a clamping bolt It. The cylindrical casing I0 is also formed with a centrally arranged tubular portion IS on which is tightly fitted a stationary electromagnetic element 16 having the windings 11 of an electric motor.

The rotary electromagnetic element of the motor encircles the stationary elements [6 and comprises the ordinary ring type squirrel cage rotor 18, die-cast in a-spider 19, which is fixed to a cup-shaped member 20, secured upon the free end of a tubular motor shaft 2| journaled in the ball-bearings 22 and 23 carried internally by the tubular portion ii of the casing 10. The rotor 18 and spider 19 are in effect a flywheel, and the spider I9 is provided with a driving friction disk 25 which is removably held in a depression in one end of the spider by means of a split ring 24. A driven shaft 26 extends through the tubular motor shaft 2| and has one of its ends journaled in a ball bearing 21, located within the cup-shaped portion of the member 20, and its other end extends through the inner race of a ball bearing 28. The inner race of the bearing 28 is held between a shoulder 29 formed on the shaft 26 and a nut 30 threaded on the reduced end of the shaft. The outer race of the be.- bearing 28 is clamped between the slidable guzde members 3| and 32 which are held together by screws 33. The guide members 3| and 32 are slidable in the guideway 34 formed in the tubular portion l5 of the frame and movement is imparted to these members by a bell-crank lever 35 having one end 36 apertured for connection to a treadle and its forked other end pivoted by the pivot pin 44 to a block 31 which is pivotally connected by a screw 38 to an angularly adjustable arm 39 seated in a groove 40 formed on the outer periphery of the tubular portion 15 of the frame.

The knee of the bell-crank is operatively connected by a pivot pin 40 and slot 4| to a head 42 connected by a reduced neck portion 43 to the slldable member 32.

Adjacent the ball-bearing 21 and upon the end of the shaft 26 there is fixed the hub 45 of the driven element 46 of the clutch. The driven element 46 has a flat peripheral portion 41 which is disposed between and is adapted to engage either the driving friction disk 25 or a brake ring 48 carried by the flange 43 of a brake-support ring 50 which is seated in the open split-rim of the casing l0, and is clamped in set position therein by the screw H. Secured by headed pins 52 to the driven element of the clutch 46 is a pulley 53 which is held in position by a cup-shaped as viewed in Fig. 2, and through the ball-bearing 28 the shaft 26 ismoved endwise to bring the driven element 46 into engagement with the driving friction disk 25 of the driving element. This causes the driven element 46 to rotate and through the pulley 53 to drive the machine. When it is desired to stop the rotation of the driven element, the end 36 of the bell-crank lever 35 is moved in the opposite direction, or downwardly as viewed in Fig. 2, and 'this motion through the above described connection causes the driven element 43 to engage the brake ring 48 and to stop the machine.

In order to hold the driven element yieldingly against the brake and thus hold the sewing machine at rest when the manually controlled lever 35 is relea"ed, I have provided a fiat bow-spring 56 formed with a central aperture which embraces the neck 43 and lies against the shoulder 51 of the slide member 32. The free ends of the spring 55 are apertured to adjustably receive the ends of the rods 58 which pass through suitable openings in the casings Ill. The other end of each rod'is offset at 59 and is formed with a lip 68 which overhand the brake supporting ring 50. The ends of the rods 58 which extend through the apertures in the bow-spring 46 are threaded to receive the adjusting nuts Bl. When the brake and clutch friction disks become worn, by simply loosening the bolt H the ring 50 may be shifted laterally in the casing In to effect a new adjustment. It will be observed that the driven element 41, the shaft 26 and the mechanism for shifting I it, the rods 58 and the bow-spring 55 all move as a unit with the brake when it is adjusted, therefore the adjustment of the brake does not disturb the relation of the parts. Also this construction insures that the adjustment of the brake will not disturb the face-to-face relationship between the driven element and the braking surface.

Referring to Fig. 2, it will be noted that the adjustable arm 39 has a U-shaped portion and that the free end 39' of the U overlies the edge of the tubular portion l of the frame. When the screw 38 is loosened this construction permits the arm 39 to be swung or rotated about the tubular portion 15 as a center and this movement will cause the entire mechanism for shifting the driven shaft endwise to swing or move through the same angle. After the actuating mechanism has been moved to the desired position the screw 38 may be tightened and this will cause the free limb 33' of the arm 39 to clamp the arm 39 to the tubular portion l5 and thus lock the shifting mechanism in the desired position. This arrangement permitsthe clutch to be actuated from various angular positions.

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

1. An electric power transmitter comprising a hollow cylindrical frame with a tubular portion extending into said frame from one end thereof. a stationary motor-element mounted on said tubular portion. a rotary motor-element disposed externally of said stationary element and mounted of the inven-' on a tubular motor shaft journaled in said tubular frame portion, a driven shaft extendin through the tubular motor shaft, a driven clutchelement fixed to one end of said driven shaft, and mechanism operatively connected to the other end ofls said driven shaft for shifting said shaft endw e.

2. An electric power transmitter comprising a hollow cylindrical frame with a tubular portion extending into said frame from one end thereof, a stationary motor-element mounted on said tubular portion, a rotary motor-element disposed externally of said stationary element and mounted on a tubular motor shaft journaled in said tubular frame portion, a driven shaft extending through the tubular motor shaft, a driven clutch-element fixed to one end of said driven shaft, a clutch friction ring carried by the rotary motor-element, a brake carried by said frame and manually controlled mechanism connected to said driven shaft for moving it endwise to cause the driven clutch element to engage either the driving friction ring or the brake.

3. An electric power transmitter comprising a frame with a centrally arranged tubular post, an electric motor stator fixed to the outer periphery of said tubular post, a tubular motor shaft journaled in bearings carried by said post, a rotor disposed externally of said stator and carried by said shaft, said rotor being the driving element of a clutch, a rotary driven shaft extending through said tubular motor shaft, a brake element carried by said frame and spaced from the rotor of the motor, a driven clutch element disposed between the rotor of the motor and the brake, said clutch element being fixed to said driven shaft, and means operatively connected to one end of said driven shaft for moving it endwise to cause the driven clutch element to engage either the rotor of the motor or the brake.

4. An electric power transmitter comprising a frame with a centrally arranged tubular post, an electric motor stator fixed to the outer periphery of said tubular post, a tubular motor shaft journaled in bearings carried by said post, a rotor and operatively connected to said driven shaft for moving said shaft endwise to cause the driven element to engage either the driving element or the brake.

5. An electric power transmitter comprising a frame with a centrally arranged tubular post, an electric motor stator fixed to the outer periphery of said tubular post, a tubular motor shaft journaled in bearings carried by said post, a rotor disposed externally of said stator and carried by said shaft, said rotor being the driving element of a clutch, a driven shaft extending through said tubular motor shaft, a brake element carried by said frame and spaced from the rotor of the motor, a driven clutch element disposed between the rotor of the motor and the brake, said clutch element being fixed to said driven shaft, a ballbearing having its inner race fixed to said shaft, and a lever operatively connected tothe outer race of said ball-bearing for shifting said driven shaft endwise.

6. An electric transmitter comprising a cupshaped frame having a centrally arranged tubular post, an electric motor-stator on said post, an electric motor rotor arranged externally of said stator, a spider carrying said rotor, a tubular motor-shaft journaled in said post and rotatably supporting said spider and rotor, a driven shaft extending through said tubular motor-shaft and journaled in bearings arranged coaxially of said motor-shaft, adriven clutch element carried by said driven shaft, and manually actuated means carried by said frame for axially moving said driven shaft.

'7. An electric transmitter comprising a cupshaped frame having a split in its rim portion, an electric motor located within said frame and having a driving clutch element, a driven clutch element rotatably carried by said frame, an annular brake-support fitted into thelopen end of the frame, a brakecarried by said support, and means for clamping said brake-support in its adjusted position within the open end of the casing.

8. An electric transmitter having a frame, a stator carried by said frame, a rotor iournaled in said frame, said rotor being the driving element of a clutch, a shaft journaled in said frame and carrying a driven element, abrake adjustably secured for movement endwise in said frame, manually controlled mechanism for moving said driven shaft endwise to cause the driven element to engage either the brake or the driving element, and an adjustable bow spring having its central portion pressing against said mechanism for constantly urging the driven element into engagement with said brake.

9. An electric transmitter having a frame, a stator carried by said frame, a rotor journaled in said frame, said rotor being the driving element of a clutch, a shaft journaled in said frame and having a driven element, a brake adjustably secured for movement endwise in said frame, manually controlled mechanism for moving said.

driven shaft endwise to cause the driven element to engage either the brake or the driving element, a bow spring having its central portion in engagement with said mechanism for constantly urging the driven element into engagement with said brake, and adjustable tie rods connecting the ends of said bow spring with said adjustable brake.

10. An electric transmitter comprising a casing having a centrally arranged tubular post, a sta- 5 tionary motor-element on said post, a rotary moelement, a driven shaft extending through said motor shaft and having one of its ends journaled in a bearing carried by said motor-shaft and its other end fixed to and journaled in a bearing slidably supported in the tubular post of said frame, a driven element carried by said driven shaft, and manually operable mechanism for sliding said last mentioned bearing longitudinally I in the tubular post of said frame.

11. An electric transmitter comprising a frame,

an electric motor carried by said frame and having a driving clutch element, a driven clutch element movable into and out of engagement with said driving clutch element, a shaft on which said driven clutch element is mounted, and means for shifting said shaft endwise including a guide member operatively connected to saidshaft and slidable in said frame, a lever pivotally connected to said guide member, an arm rotatably adjustable in agroove formed in said frame, said arm being pivotally connected to said lever, and means for clamping said arm to said frame.

12. An electric power transmitter comprising a hollow cylindrical frame with a tubular portion extending into said frame from one end thereof,

a stationary motor-element mounted on said tubular portion, a rotary motor-element disposed externally of said stationary element and mounted on a tubular motor shaft journaled in said tubular frame portion, a driven shaft extending through the tubular motor shaft, a driven clutchelement fixed to one end of said driven shaft, 9. driving pulley directly connected to said driven element, and mechanism operatively connected to the other end of said driven shaft for shiftin I said shaft endwise.

EDGAR P. TURNER.

No references cited. r

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