US1001674A - Variable-speed power-transmitter for sewing-machines. - Google Patents

Description

1).- NOBLE. VARIABLE SPEED POWER TRANSMITTER FOR SEWING MAOHINES.

pAPPI-IUATION FILED MAY 17, 1907.

1,001,674.. v Patented Aug. 29,1911.

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, D. NOBLE. v v VARIABLE SPEED POWER TRANSMITTER FOR SEWING MACHINES.

APPLICATION-FEED MAYQ17, 1907.

1,001,674. v Patented -Aug.' 29, 1-911;

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ATTORNEY.

i To all whom wit-may concern asst AVAILABLE corY "UNITED l AT S irnnr noNALnNoBLE'," orrmnenron'r, connncrrcnnassrenon TO THE SINGER Mann rac'ronme comramz. a COBBOBATIONOF NEW JERSEY.

' VARIABLE-SPEED rownarmansmrrrnn iron. SEWING-MACHINES.

Be it known that I, DONALD NOBLE, a subject ,of the King. of Great Britain, and a resident offBridgeport, inthe county of Fairfield and State ofGonnecticut, have in-' vented certain new and useful Improve ments in Variable-Speed Power-Transmitters for Sewing-Machines, of which the following is a specification.

My invention relates to impr oveme ts in speed controlling mechanism for sewing machines, and has for its object to effect an automatic change in speed through the power transmitting mechanism.- 2

In the accompanying; drawings illustrating the invention, in the several figures of which like parts are similarly designated,

machine bed-plate and parts directly con- Figure 1 is a view in side elevation of a buttonhole 'sewlng 11'l21Cl11I1G,:POWeI trans- "mitter, and main driving shaft provided with pulleys, together with a sectional view the eto. Fig. is an enlarged rear end ele vat on of the sewmg mach ne, transmitter,

'of ;he power bench and the parts secured table and table parts shown in Fig. 1. Fig.- .3 1s a rear slde elevation of the sewing ma chine. Fig. 4 1s a rear side view of theback end of the sewing machine, the bed- "plate beingshown in section,'and the arm standard shown partially in section to bet- .ter illustrate the mechanism for controlling the-cycle of feed movements of the material. F1g.;5 is an underside view of the sewlng nected therewith. Fig. 6 is an enlarged central vertical sectional elevation of the transmitter. Fig. 7 is a'perspective view of the switch for manually controlllng the transmission of power. I

The machine to which my invention is in this case applied isxco'min'ercially known as the Singer buttonhole-sewing machine but the invention is equally applicable to otherforms of sewing machines constructed for cycle sewing, and in describing my invent ion only such limited reference will be made to the well-knownparts, of the sewing machine as is deemed necessary for a'proper understanding of my invention.

1 is the bed-plate of the sewing machine, 2" theovenhanging.arm, and 3' the arm standard t is the work-holdingand feedingclamp provided with apivoted lever 5, oneendof Specification of Letters Patent. Patented Ann l Application filed Ma' 17, 1967.

Serial n. 374,159.

which lever is connected by a chainfi with p a suitable foottreadle (not shown). The

'tricconn'ection 1O connecting the eccentric 9 with a rock-shaft 11 mounted beneath-the bed-platel, said rock-shaft being in turn connected by a feed adjusting link 12 with a lever 13 of the clutch device 1 1, which latter operates the feed disk 7 secured upon the lower end of a vertically arranged shaft'15 carrying a cam 16 later to be referred to, the upper end of. said shaft being operatively connected with the needle vibrating mechanism (not shown) carried by the overhanging arm 2; For a more detailed understanding of the function of the feed disk and its actuating parts, reference maybe had to U. S. Patent No. 784,291, March 7, 1905, to .13. Allen.

. The machine herein shown is provided with a stop-motion device comprising mainly a clutch cont-rolling lever 17 carrying a spring actuated plunger 18, the upper end carried by the tight Mounted upon the outer end of the shaft 8 1s a loose pulley 22 over which a 'belt;;23$ travels when the machine is at rest, 'the tight'pulley 21' coacting with said belt to drive the machine. The belt 23 is adjusted to coactwith first one and then the other of the pulleys 21,22 through a shipper lever 24 carried by the clutch controlling lever 17, a spring 25 acting, normally, to hold said controlling lever in the position shown in Figs. 1 and 3, -01 in the position which it occupies when the machine is at rest. Owing to the driven pulleys 21 and 2:2 rotating in a'dircction' transverse to the rotation of theirdriving pulleys, an idler 23' is provided for the purpose of guidingthe bclt'23 in proper alinement with said driven pul- -leys. Through connections comprising a rod 26, a chain 27 connected with a foot treadle notch 29 formedin the stop cam '20, and atthe same time the lever Q-t is moved to ship the belt 23 off the loose pulley 22 and into engagement with the tight pulley 21. To

better facilitate the movements of the rod secured pintles 33, 33 upon which the clutch controlling lever 17 is pivoted.

he construction of the stop-motion de vice above pointed out is substantially LllB same as is illustrated and described in U. S. Patent Xo. 738,591, Sept. 8. 1903, to B. Allen, to which reference may be had.

To the lower end of the clutch controlling lever 17 is secured, by a stud bolt 3i and nut 35, a depending finger 36 to the lower end of which is hinged, by a stud screw and nut 38, a latch 39 which is acted upon by a spring 40 to resiliently hold the hooked. end -.t1 of said latch against vertical movement.

42 is the transmitter bracket suitably secured to the underside of the work-bench '3 and provided with bearings it, $5 in vwhich during the operation of the machine at its high speed is acted upon by the hooked end i1 of the latch 39, in a direction to cause the free end of an arm 50. secured to thelower end of the shaft 46, to act upon the spring plunger 51 which forms a part of the power transmitting mechanism now to be described.

The transmitter comprises two casings 52 and 53, secured together at their outer edges by suitable screws-54. the casing 52 being secured by a screw 55 in a cylindrical bearing 56 formed in the lower end of the transmitter bracket 42.

57, 57 are hollow shafts mounted in the casings 52 and 53, one of said shafts carrying a low speed pulley 58 and the other shaft carrying a high speed pulley 59, the hubs 60 and 61 of said pulleys wadingwith suitable ball bearings 62 and 63 located in the oppositely arranged casings 52 and 53 64: is a centrally mounted and frictionally driven machine belt driving pulley formed with oppositely arranged projecting hubs 65 and 66 rangedhollow shafts 5.7, 57.

To the inner faces of the pulleys 58 and" are secured suitable friction rings 67 and '38 formed, in the present instance, of

ltathcr. said pulleys acting to frictionally' mounted in the oppositely ardrive the centrally mounted pulley 64; at

different speeds.

69 and T0 are springs mounted in the hollcw shafts 5T, 5?, the spring 69 being acted upon by the pluhger 51, and the oppositely arranged spring 70 being confined between the adjusting screw 71 and ball bearing 72,

which latter coacts with a hardened ring 73 mounted upon the end of the hub 6 of the pulley 6%, the opposite hub 65 being provided with a like hardened ring and ball bearing located between the hub 35 and the spring 69.

H is the main or power driving shaft upon which are mounted the belt driving pulleys T5 and T6 of unlike diameters; the pulley Booting, through the belt 77, to di' e the low speed pulley 5S, and the .t v T6 acting, through the belt TS,- to drive the high speed pulley 59, the belt pulley 6% being operatively connected, through the belt 23, with the tight and loose pulleys 21 and mounted upon the main shaft 8 of the sewing machine.

' In the operation of the machine, supposing the machine to be at rest with the parts in the positions shown in'Figs. 3 and 5, the operator, through the foot treadle (not shown), pulls therod 26 down until the notch 79 formed in said rod coacts with the end '80 of the'catch lever 81 and holds said rod in its lowered position, and in doing so rocks the clutch controlling lever 17 to the position shown in Fig. 4, which causes the end 19 of the plunger 18 to be released from engagement with the notch 29 formed in the stop. cam 20. At the same time the shipper lever 2% acts to ship the belt-23 off from the loose'pulley 22 and onto the tight pulley 21, thus causing the machine to be put in operation for the overseaming of the buttonhole. As the feed, disk 7 is about to complete its rotation in the overseaming of a buttonhole, a cam 82 carried by said disk contacts with a finger 83, which forms a part of the plate 8& adjustably secured to the catch lever 81, and withdraws the end of said catch lever from the notch 79, thereby permitting the spring. 25 to return the parts to their positions as shown in Fig. 3, and thus arresting the action of the maqhine.

In the operation of the speed controlling mechanism su osin the machine to be at carried by said shaft'to turn in a direction to force the belt driving pulley 64 against the friction ring 68 carried by the fast driving pulley 59, through the connections comprising the plunger 51, spring ball bear- I as a stop'or register for the arm 49 when ing 72 and ring 73, thus, through the belt 23, transmitting to the'machine its high.

carriedby the Vertically arranged camshaft '15,- and ust prior tothe actuation. of the machine, said hooked end drops off from the point-87 of the cain"16,thus-"'er fi1tl.1ng the; spring 86' to. oscillate the"lever 86 and, through a latch 88 pivotally secured at one end ofthe lever 86, and a pin.89, lift the 15 allowing-the 'spring'TFO mounted the .q-transmitter to force. the belt'pulley 64 into -pp'erativ'e relationshi with the slow' driving f: 58 and thus, t rough the belts 23 and L I trahs'mitting' to the 'machineits low "'In'theppractical operation ofmachines of the character herein pointed out it is de-.

continue for a time-the, action of the ma: chine drivlng belt; and to effect this control of the power transmitting mechanism, I. provide a manually controlled switch lever. 90wh1ch, 1n the present instance, is pivot-' ally mounted upon a frame 91 secured by screws 92, 92 to the workbench 43. The lever 90 comprises a main or hand adjusting portion and an L-shaped.portioxn93','the free lar projections 94 and 95-, the former acting end 85 of a trip lever 86 rides the cam 16 stop-motion for arresting the action of the latch 39 out of engagement with the arm' sirable, and-in may cases essential, to di s.

end of the latter-"being provided with angu-.

.the lever 90 is adjusted against the lug or stop 97, as shown inFigs. 3 a'nd 7,.or tothe positionwhic h it occupies when'the machine is at rest or when it is beingactuated at its lowest speed. But when the lever 90 is ad 'justed" against the stop or lug" 96, the angue lar projection. 95] acts to hold thejarm 49 intermediate its positions for effecting the low; and high speeds, thus, through the con.- nections comprising the parts 46, 48', 50, 51, 69 and the dupli catesj of the-ball bearing 63 and ring 73, causing the centralbeltl pulley 64 to be held in; a central position intermediate the pulleys58 and;.,59, as illustrated in Fig. 6, thus holding ,the pulley 64 out of contact with-the pulleys 58;and 59.

From the natureozt :the construction it is evident that the angular projection 94 for registering the arm- 49 m its normalor low speed position might consist of anindependently mounted part, as ,the use of such projection is simply aprefieried form of construction.

' vention comprehends a5; construction of speed controlling. mechanismcapable of use in connection with anyof.the-formsv of'sewing' machine construction ,which' employ a j cloth. feeding mechanism automaticallyzcon- Further, it will be understood that my in trolled to efiect a predetermined cycle-of I stitching, as distinguished from such earlier forms of constructioniof speed controlling mechanism as are so intimately connected with the control of the feed-actuating me'ch- 7o anism as to be limited to substantially the specific construction employed for arresting the action of the stitch-forming and cloth feeding mechanisms.

"What! sewing machines, a main driving shaft, la main power shaft, power-transmitting pulleys mounted independently of said shafts,

said power transmitting pulleys including an .adju'stably mounted and friet-ionally driven machine belt drivingpulley, and connections for tI'fiIlSHllttlIlg-YQOWQP from said -main power 'shaftrthroughlsaid power transmitting pulley to the main driving shaft, in

combination with automatic means for ef- 'feictmg a reduction ingthespeedyf the sewing machine at a predptcrmined time.

2. In a variable speeds power transmitter for sewing machines, -mainpower shaft, driving pulleys mounted said shaft, an adjust-ably mounted and fgri ctionally driven machine belt-driving pulley, two positively driven pulleys mounted to 'rotate-on the 'sameaxis as said frictiona driven pulley,

said frictionally driven pulley Boeing arranged intermediate said positively. driven pulleys, in combination with mpans for ad- 'justing and yieldingly lioldiriglsaid frictionally driven pulley in operative -relationship .100

.with either one or the otherof. said positively driven pulley including springs mounted on opposite sides of said adjustably mounted. and frictionally driven machine belt-driving pulley. a i

3. Ina variable speed power transmitter for sewing machines, a main power shaft, driving pulleys mounted on said shaft,

a frame or casing, threev pulleys journaled in said frame, two' of which are 1 positively driven at ditferenh speeds and arran ed on opposite sides ';.of the third or adjustably mounted and frictionally driven; machine belt driving pulley, in combination with automatic means a ,yieldinglycontrolled? 0 erative -j'enga e ment between said frictiona l' jdriven pul ey and the positiyely driven pulley ogt slowest seedl." 1-

4. Ina variable speed powertransmitter for sewing'dnachineaja main" power shaft, driving pulleys mounted on said shaft, a casing, a" multiple of pulleys mounted to rotate upon the. same axis journaled. in said casing, two of which are positively driven at ,diiterent speeds andarranged on opposite sides. of the third, the latter friction-ally driven, and acted upon by. oppositely arranged springs, in combination with manually operated means for adjusting andh'oldfor effecting 1-1 5' ing said frictionally driven pulley out of operative relationship with. said positively driven pulleys.

In. a variable speed power transmitter for sewing machines, a main powershaft, drivingpulleys mounted on said shaft, a two-part frame or casing, hollow shaftssecured in said frame, positively driven power transmitting pulleys journaled upon said shafts, and an adjustably mounted and frict-ionally driven machine belt driving pulley journaled within said hollow shafts, in combination with means, includingtsprings, for resiliently holding said frictionally driven pulley in operative relationship with either one or the other of said positively driven pulleys.

6. In a variable speed power transmitter for sewing machines, the following instrumentalities in combination: an adjustably mounted and frictionally driven machine belt driving pulley, positively driven pulleys mounted upon the-same axis and arranged on opposite sides of said machine beltdriving pulley, said positively driven pulleys provided with devices for frictionally driving said machine belt driving pulley, a

' spring mounted to move said machine belt driving pulley in one direction, a spring actuated to move said machine belt driving 30 pulley in the opposite direction, and a plunger for actuating said last named spring.

Signed at Bridgeport, in the county of Fairfield, and State of Connecticut, this 10th '35 day of May, A. D. 1907.

DONALD NOBLE. Witnesses:

ALBERT K. lVILLIAMs, ABBIE M. DONIHEE.

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