US2905121A - Device enabling the needles of sewing machines to be stopped in one of their top or bottom dead centre positions - Google Patents

Device enabling the needles of sewing machines to be stopped in one of their top or bottom dead centre positions Download PDF

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Publication number
US2905121A
US2905121A US474750A US47475054A US2905121A US 2905121 A US2905121 A US 2905121A US 474750 A US474750 A US 474750A US 47475054 A US47475054 A US 47475054A US 2905121 A US2905121 A US 2905121A
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United States
Prior art keywords
shaft
sleeve
clutch
casing
stator
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Expired - Lifetime
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US474750A
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English (en)
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Gerbaud Auguste Henri
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Individual
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Individual
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Publication of US2905121A publication Critical patent/US2905121A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position

Definitions

  • This invention relates to a device enabling the needles of a sewing machine to be stopped in the top or bottom dead-centre position, in which two motors are employed whose rotors are integral, whereas the stators placed on the same axle each have an independent electric feed circuit for effecting the reversing of the rotation direction of one of the motors when the needle is positioned.
  • the operating device is provided with an inertia circuitbreaker which enables the operator to choose her needle position and control it before the sewing machine stops.
  • the axle on which the stators are mounted is hollow and contains a shaft which can slide transversally, on which are fixed, on the one hand,
  • a double clutch and a double brake and on the other hand, a reducing gear device allowing an inertia block disc to be driven at reduced speed operating a circuit-breaker controlling a relay causing the circuit-breakers to reverse the direction taken by the current passing into one of the motors at the moment when the needle of the sewing machine is positioned.
  • Figure l is a longitudinal sectional view of mechanism
  • Figure 2 is an elevational view, partly in section, of the drive portion of a sewing machine
  • Figure 3 is a horizontal sectional view taken substantially along the plane defined by line IIIIII of Fig. 2;
  • Figure 4 is a vertical sectional view taken substantially along the plane defined by lines IV-IV of Figs. 2 and 3;
  • Figure 5 is an electrical circuit diagram of the device
  • Figure 6 is a sectional view of another embodiment of the drive portion of the device.
  • Figures 7 and 8 are vertical sections taken substantially along the planes defined by lines VII-VII and VIII--VIII, respectively, of Fig. 1, and showing the gear reduction device,and
  • Figure 9 is a sectional view taken substantially along the drive the plane defined by line XX of Fig. 1.
  • the sleeve 6 bears against a thrust bearing 7 and is extended to a cam disc 8 having a circular series of spaced cam sockets or holes 9.
  • a rotary cage 11 can revolve with regard to thehollow axle 3 by the interposition of ball bearings 13, 14 between 2,905,121 Patented Sept. 22, 1959 the arms 12 of the rotary cage 11 and the hollow axle 3.
  • the rotary cage 11 is extended by a hood 11a on which a crown 14a is fixed carrying guides 15.
  • a second crown 16 can slide on the guides 15.
  • 17 designates springs interposed between the crown 14a and the crown 16.
  • a drum 18 is fixed on the hollow axle 3 which carries a ball bearing 19 on which a sleeve 20 can slide, resting on bearings 21, 22 mounted on a shaft 23 housed inside the hollow axle 3.
  • a brake 24 and clutch 25 are mounted on the sleeve 26) and co-operate, one with the drum 18, and the other with the sliding crown 16.
  • a pinion 26 is mounted on. the shaft 23 which also carries two ball bearings 27, 28 on which a sleeve 29 rests; this sleeve is integral with one of the rings of an overrunning clutch 31.
  • a disc 32 provided with a brake 33 and a clutch 34 is fixed on the sleeve 29. This latter is connected by any suitable means such as a pulley 294 with the driving shaft of the sewing machine 35.
  • An axle 36, integral with the clutch 25, carries a pinion 37 meshing with the pinions 26 and 30.
  • the pinion 37 is loosely mounted by means of bearings 36a, 36b on the shaft or axle 36.
  • the clutch 25 is provided with a friction lining 25a and is associated with a sleeve 25b mounted on the bearings 21,. 22.
  • the overrunning clutch 31 is mounted on the sleeve 29 which carries the driving pulley 290.
  • the sleeve 29 is loosely mounted on the end of the shaft 23 through the intermediary of the bearings 27, 28.
  • a perforated disc 38 carries balls 39 near its periphery, placed in the holes 9 of the inclined disc 8, and inthe holes of the second inclined disc 40 connected by rods 41 to an inclined disc 42 fixed to a hub part 43, integral with the shaft 23.
  • the hub part 43 also carries an inclined disc 44 holding balls 45 between it and the disc 42 placed inside the holes drilled in a disc 46 provided with a control lever 47.
  • the disc 44 is thrust against the balls 45 by a spring 48 mounted on hub part 43.
  • a pin 49 is integral with the shaft 23 and has a cross bar 50 attached thereto.
  • Springs 51 are mounted on the end of cross bar 50 and also mounted on the casing 1.
  • Blades 52 are mounted on the rotary cage 11 inside the casing 1 and form a fan for cooling the interior of the motor with an aircurrent.
  • the rotation of the motor which is transmitted to the shaft 35a of the sewing machine 35 rotatively drives a cam 53 mounted on a shaft 54, integral with the shaft 35a.
  • the shaft 54 which rests in a bearing 55 placed inside a casing 56 containing circuit-breakers 57, 58 supports an inertia disc 59 able to slide on the shaft so as to come into contact with a blade 60 hinged at 61 on a disc 62 fixed in the casing 56.
  • the studs 57a and 58a of the circuit-breakers 57, .58 are electrically connected by the blades 63, 60, the contacts 60a and 60b, the blades 63a and 63b, to a terminal 630, whereas the movable contacts 57b, 58b of the circuit-breakers 57, 581 are electrically connected by blades 64,65 to terminals 66, 67.
  • a spring 68 is interposed between the blade 60 and the cover 69 of the casing 56.
  • the motor formed by the rotor 5a and the stator 5 is fed with three-phase current from a source S through a circuit-breaker 70, which is hand operated;the motor formed by the rotor 10a and thestator 10 is fed with three-phase current through a relay 72 which enables the direction of two phases of the current feeding this motor to be established or. reversed, so as to put the motor into concordance or opposition with the motor formed by the rotor 5a and the stator 5.
  • the relay 72 may be actuated by any suitable means which will time the actuation thereof to take place after the sewing machine is stopped. Thus, the relay actuating means should be signal to. do so.
  • the device works in the following manner:
  • the clutch 25 and the clutch 34 thus form a double clutch rotatively driving the terminal part of the sleeve 29 integral with the pulley 290 connecting the motor to the sewing machine.
  • the pinion 37 revolves on the fixed pinion 26 and the pinion 30.
  • the pinion 30 advances by one tooth, but as it is blocked on anoverrunning clutch 31,-.the latter compensates for the speed difference.
  • the assembly of pinions 26, 27' and 30 is not new and is known by the name of Fergusson Reduction System. In this case,-one of the pinions 30 is mounted with the-overrunning. clutch 31, as shown in detail in Figs. 7 and 8.
  • the sewing machine 35 drivesthe shaft 54 which transmits movement to the inertia disc 59.
  • the latter then assumes the position shown in Fig. 3.
  • the lever 47 pivots in the. opposite direction to the arrow P (Fig. 1), owing to. the action ofthe springs 51 the latter being attached to the cross-bar .50 integral with the shaft 23.
  • the balls 45 then assume a position so that the plates. 42, 44 come closer together and the shaft 23 recoils in the opposite, direction to the arrow F
  • the clutch 25 and brake 24 also go slightly backward, thefclutch 34 is then freed from the hood 11a. Only the clutch 25 is still in contact with the crown.
  • the pinion 37 is then rotatively driven round the fixedv pinion 26 For one revolution of this pinion round the pinion 26, thepinion 30, which has one more tooth than the pinion 26, advances by one tooth. We thus have a speed reducion corresponding to the ratio of the teeth between the pinion'30 and the pinion 26.
  • the pinion 37 turns on the fixed pinion 26 and at the same time on the overrunning clutch- 31.
  • each of-the pinion. 37 on the pinion 26, the pinion is in contact with 11b of the extension 11a of the rotary cage 11.
  • the sleeve 29, which carries the disc' 32' 'associated with the clutch 34, turns at high speed in synchronism with the rotary cage 11. This movement at high speed is transmitted to the central ring 31a of the overrunning clutch 31.
  • the outer ring or pinion 30 of clutch 31 turns always at low speed. This is analogous to themovementof a bicycle down hillgthe rear whee'l turns at high speed' withithei-nner ring-of the, Over-running clutch associated with the hub' of the rear'wheel and the cyclist can pedal slowly wi hout hinderingthe movement of the hub of the rear wheel. 7
  • The. contacts 60a, 60b are separated and the current transmitte d by means of the conductor 78,the lever 74, the contact 75and the studs'76 or'"77'does not reach as far as the relay 72.
  • the latter is not excited.
  • the relay 72 as shown in Fig. 5, comprises a coil 172, an armature 272 and a rod 372 connecting the armature with two pivotally mounted switches "72a, '72b.
  • the shaft 54 having now completely stopped, the inertia of the inertia block-disc 59 is absorbed and the latter returns to its first position owing to the pressure of the spring 68.
  • the contacts 60a, 60b bear one against the other, the current excites the relay 72 which causes the circuitbreakers 72a, 72b to pivot.
  • Two of the phases feeding the motor are inverted and the stator 10 of the-latter tends to revolve in the opposite direction to the rotary direction of the motor-5.
  • the stator 10. turns for a few degrees, and owing to 'this fact, through the intermediary of the sleeve 6, drivesthe inclined disc 8 which thrusts the balls. 39, the inclined disc- 40, the rod 41, the inclined-disc, the balls 45 and the inclined disc 44.
  • the shaft 23. recoils in the direction of the arrow P (Fig. 1).
  • the brake 24 separates from the drum 18, the clutch 25 contactsthe crown 16.
  • the reducing gear device formed by the pinions 26, 30 and 37, revolves and drives the pulley operating the sewing machine: 35.
  • cam 53 integral with the shaft 54, which-extendsIfrom the. shaft 35a of the sewing machine, also revolves -movesonev of the circuit-breakers57 or" 58.
  • the relay 72 being no longer excited returns to its originalj'pQS'ition.
  • the rotary cage 11 sustains, through the intermediary of a ball bearing 100, a cup-shaped member 101 which has a helical gear 102 extending entirely around the inner periphery thereof to engage with a pinion 103 mounted freely on an axle 104, integral with a support.
  • 105 fixed on a keyed sleeve 106, sliding at 107 on the shaft 23.
  • a worm wheel 108 mounted freely, on the one hand, on a ball bearing 109 centered on the sleeve 106, and on the other hand, on a ring 110, is integral with a plate 111.
  • 112 designates a lining integral with the disc 32.
  • An electric power system for operating a driven shaft comprising a casing, a double electromotor with two rotors in said casing, a rotary cage on Which said rotors are rigidly mounted Within the casing, two stators mounted on a hollow axle within the casing, one stator being fixed and the other having a limited rotary movement, two electric circuits for the stators for effecting the reversing of the. rotary direction of one of the motors when the driven shaft is positioned, mechanism including.
  • manually operated means connected with said movable stator for transmitting rotation of a few degrees thereto, a shaft within the hollow axle connected with said mechanism to be moved axially thereby, a sleeve journaled on the shaft and positioned opposite said mechanism, brake means in said casing, clutch means connected with said rotary cage, brake means and clutch means mounted on said sleeve for selective engagement with said casing, brake means and said rotary cage clutch means in accordance with the movement of the shaft by said mechanism, and driving means on said sleeve positioned outside the casing for operating the driven shaft.
  • An electric power system for operating a driven shaft comprising a casing, a double electromotor in said casing and including two rotors rigidly mounted, a rotary cage on which the two rotors are rigidly mounted within the casing, a hollow axlewithin the casing, two stators mounted on said axle, one stator being fixed and the other statorhaving a limited rotary movement, two electric circuits for the stators, a shaft movable axially within the hollow axle, means within the casing for moving said shaft, drive means journaled on said shaft for oper ating the driven shaft, said drive means being axially movable with said shaft, clutch means on said drive means, clutch means driven by said rotary cage and respectively cooperative with said first dual clutch means for selectively operating said drive means at high and low speeds, mechanism including a manually operated lever for closing the circuit to the movable stator to cause it to rotate a few degrees and operate the drive means at low speed.
  • An electric power system for operating a driven shaft comprising a casing, a double electromotor in said casing and including two rigidly connected rotors, and
  • An electric power system for a sewing machine having a drive shaft comprising a casing, motor means including a rotor and a stator in said casing, a hollow spindle fixed in said casing, a shaft slidably mounted within said hollow spindle, a rotary cage on which said rotor is rigidly mounted within the casing, said cage and-rotorbe n wieu a sd a-s p Said stat "being mounted on said spindle forlimited rotary movement, drive means journaled on said shaft for connec- ,t,ion-wi thsaid drive, shaft onvthe sewing machine, clutch means on said rotary cage, brake means, on said casing for braking said drive means, control means in said casing including said slidable shaft for controlling actuation'ofsaid clutch and brake means,-electric circuit means fornormally energizing the motor means, to, operate the sewing machine when said clutch is engaged, selective driving means; within the casing in selective operative relation with'
  • relay means controlling said reversing switch, a shaft projecting from the sewing machine, a cam mounted at the end of said shaft, a switch'in the circuit feeding said relay means mounted on the sewing machine and opened by said cam-when the latter is in a predeterm ined angular position, a mechanism, connected with the movable stator-andactuated; thereby when said reversing switch rotary; cage, respectively, according tothe axial movement ofsaid shaft, drivingmeans on saidsleeve and driven by said motor to drivelthe'sewingmachine, inertial switch means in the relay means circuit operated by said,
  • sewing machine shaft for holding said circuit-openuntil saidshaft stops, and control means for actuating said lmechanism independently of said movable stator for moving said shaft to controlsaid clutch and brake means selectively for stopping rotation of ,said sleeve.
  • SpThe device of claim'7 comprising gearreduction means selectively operativelyassociating said rotary cage and-said sleeve when said'clutch means disengaged for drivingsaid sleeve at a slow speed.
  • said rotor clutch means and said casing brakemeaiis, brake'me'aiis on saifd carrier cooperative, with said casing brake means when saidfshaft is atone extreme position 'to hold' said drive means, stationary, clutch means on said carrier for cooper'ation with: said, rotor clutch means when s'aidshaftfis slid axially to, its other extreme. position to fdrivefsaid drive.
  • “10.An'electri'c power system comprising a casing, motor. means including-a. rotor and stator. in said casing, an, electric circuit, for. feeding'thermo'tor, auxiliary. circuit means connected 'withf' the stator to e'fiect rotary moveineiitv thereofwwhen actuated; a: hollow spindleifixed in said casing; ashaft slidably mounted within said lid spindle, a rotary cage'on which said rotor is Ti 7 dly mounted withinTthecasing, said cage and rotorbeing journaledjon saidspiridle, saidstator being mounted on said spindle for' limited, rotarrm vemem, a.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US474750A 1953-12-15 1954-12-13 Device enabling the needles of sewing machines to be stopped in one of their top or bottom dead centre positions Expired - Lifetime US2905121A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR766497X 1953-12-15
FR2905121X 1953-12-15
FR323879X 1953-12-15
FR31154X 1954-11-03

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US2905121A true US2905121A (en) 1959-09-22

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US474750A Expired - Lifetime US2905121A (en) 1953-12-15 1954-12-13 Device enabling the needles of sewing machines to be stopped in one of their top or bottom dead centre positions

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CH (1) CH323879A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224543A (en) * 1963-06-15 1965-12-21 Pfaff Ag G M Motor drive and coupling mechanism for sewing and the like machines
US3435930A (en) * 1967-05-25 1969-04-01 Singer Co Tapered roller bearing assemblies for electric motors
US3482538A (en) * 1967-06-12 1969-12-09 Tokyo Juki Industrial Co Ltd Apparatus for stopping a needle-bar at any predetermined level of a sewing machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429425A (en) * 1942-09-24 1947-10-21 Bendix Aviat Corp Driving mechanism
GB694769A (en) * 1951-08-20 1953-07-29 Singer Mfg Co Device for controlling the operation of sewing machines
FR1059104A (fr) * 1951-08-20 1954-03-23 Singer Mfg Co Machine à coudre à dispositif de commande perfectionné
FR1089452A (fr) * 1953-12-15 1955-03-17 Dispositif permettant l'immobilisation des aiguilles de machines à coudre dans une de leurs positions de point mort haut ou bas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429425A (en) * 1942-09-24 1947-10-21 Bendix Aviat Corp Driving mechanism
GB694769A (en) * 1951-08-20 1953-07-29 Singer Mfg Co Device for controlling the operation of sewing machines
FR1059104A (fr) * 1951-08-20 1954-03-23 Singer Mfg Co Machine à coudre à dispositif de commande perfectionné
FR1089452A (fr) * 1953-12-15 1955-03-17 Dispositif permettant l'immobilisation des aiguilles de machines à coudre dans une de leurs positions de point mort haut ou bas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224543A (en) * 1963-06-15 1965-12-21 Pfaff Ag G M Motor drive and coupling mechanism for sewing and the like machines
US3435930A (en) * 1967-05-25 1969-04-01 Singer Co Tapered roller bearing assemblies for electric motors
US3482538A (en) * 1967-06-12 1969-12-09 Tokyo Juki Industrial Co Ltd Apparatus for stopping a needle-bar at any predetermined level of a sewing machine

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Publication number Publication date
CH323879A (fr) 1957-08-31

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