US1184337A - Sewing-machine stop-motion. - Google Patents

Description

A. F. FIFIELD.

SEWING MACHINE STOP MOTION.

APPLICATION FILED APR. 8. 1914.

Patented May 23,1916.

WITNESSES: 73 INVENTOR 6\ f MJZW T OR/VEY THE COLUMHXA PLANOGRAPH co., WASHINGTON, D. c.

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ALBERT F. FIEIELD, F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE error-Morrow.

Specification of Letters Patent.

Patented May 23, 1916.

Application filed April 8, 1914. Serial No. 830,345.

Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Stop-Motions, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to manually operated means for controlling the operation of a stop-motion to determine at the will of the operator the period of operation of stitching mechanism, and it has for its ob ject to provide means under the control of the operator for rendering the stop-motion tripping means ineffective in performing its normal function for arresting the action of the machine.

In its preferred form, the improvement comprises a rotary member carrying a tripping point adapted for'action upon an inter mediate element normally arranged to transmit to the stop-motion movements imparted to said element by the tripping point but movable into and out of operative relation effecting the described resul with an element of the stop-motion device. The stop-motion preferably comprises a spring-pressed stop-lever carrying a spring pressed plunger adapted for engagement with a stopping cam upon the main-shaft of a sewing machine and adapted to be held in retracted or inoperative position by means of a detent lying in the normal range of movement of said intermediate element. It is evidently immaterial, in the broader aspect of the improvement, whether the influence of the tripping point upon the stoplever detent be temporarily interrupted manually by the interposition of the intermediate element movable out of operative relation with said element of the stop-motion device or some other means be employed for In the accompanying drawings, Figure 1 is a perspective view of a sewing machine provided with the present improvement, taken from the rear side. Fig. 2 is a perspective view, taken from the opposite side, of a portion of the stop-motion controlling mechanism. Fig. 3 is a sectional elevation representing a portion of the stop-lever.

The machine is shown provided with the usual bed-plate 1 and bracket-arm 2 in the upper member of which is journaled' the main-shaft 3 carrying upon its rearward end the fast and loose pulleys 4 and 5. In the head of the bracket-arm is journaled the usual rectilinearly reciprocating needle-bar 6 operatively connected with the main-shaft and carrying the eye-pointed needle 7 cooperating in the production of stitches with a suitable loop-taker beneath the bed-plate.

The machine is provided with thread-cutting mechanism and a stop-motion device constructed substantially in accordance with theUnited States patent to J. J. Sullivan No. 777,564, dated December 13, 1914, with special means of manual control of their time of operation.

The fast pulley 4 has formed integrally therewith or rigidly attached thereto the stoppingcam 8 adapted for engagement by the plunger-bar 9 fitted within a suitable socket of the stop-lever 10 which is pivotally mounted in the oscillatory bearing-plug 11. The plunger-bar 9 is pressed upwardly within its socket by means of the spring 9. The stop-lever 10 is pressed normally backward into stopping position 'by means of the spring 12 and'its lateral motion under the momentum of the moving parts is resisted by the thrust-pin 13 with its cushioning spring 14. The stop-lever carries at its upper end thebelt-shipping fork 15 and is provided also in its rearward face with a notch 16normally entered by the hooked extremity 17 of the detent-lever 18 mounted upon the fulcrum stud-screw 19 and pressed normally into operative relation with the stop-lever by means of the spring 20.

A lateral projection 21 of the bracketarm is provided on its rearward edge with a fiat seat having theprojecting stud-screws 22 entering the elongated apertures 23 in the slides-bar 24 provided with the transverse socket 25 in which is fitted the endwise-movable tripping plug 26 provided with the lat- I eral pin 27 passing through a suitable slot in the socket and pressed normally backward in said socket by means of a spring 28 secured upon the bar 24 by means of the screw 29. One end of the pin or plug 26 is adapted for engagement with the forwardly extending arm of the detent-lever 18, while the opposite end lies in the normal path of The hub 32 of the cam-wheel is fitted upon the hub 33 of the peripherally toothed wheel 34 which is mounted upon the fulcrum-stud 35 fixed in the bracket-arm. The cam 31 and toothed wheel 34 are secured together to rotate in unison by means of the bolt 36. The gear-wheel 34 meshes with a pinion 37 fixed upon one end of the short shaft 38 having upon its opposite end the bevel-wheel 39 meshing with the bevel pinion 40 which is fixed upon the main-shaft 3 and communicates to the cam-wheel 31 through the de scribed connections one rotation for a plurality of rotations of the main-shaft and consequently for a plurality of stitch-forming cycles.

The cam-wheel 31 has in its rearward face the cam-groove 41 entered by a follower in the form of a roller-stud 42 carried by the vibratory lever 43 having its split hub loosely journaled upon the hub 44 of the cutter-actuating vibratory lever formed with the dependingarm 45 and the upwardly extending arm 46. The cutter-actuating lever is j ournaled upon the fulcrum stud-screw 47 tapped into the boss 48 of the bracket-arm.

The lever-arm 46 has pivotally mounted thereon near its hub portion by means of the pin 49 the channeled coupling lever 50 adapted to receive the outer portion of the lever 46 within its channel, as represented in Fig. 2. Secured to one edge of the lever 50 by means of screws 51 is the cross-member 52 of a lateral arm 53 carrying the stud-screw 54 and having secured thereto by means of the fastening screw 55 the lateral portion of a bent wire passing through said arm and extending therefrom laterally in the form of a pin 56 which enters an aperture in the lower portion of the slide-bar 24 and serves to connect the slide-bar with the coupling lever 50.

'The depending lever-arm 45 is formed with a tapered extremity embraced by the lateral fork 57 of the spring-retracted cutter-actuating slide-bar 58 beneath the bedplate, as shown and described more fully in the 'said United States Patent No. 777,564, and in my application Serial No. 830,344, filed simultaneously herewith. The depending stud 59 of the bar 58 enters the forked extremity of the lateral arm 60 of a bellcrank fulcrumed beneath the bed-plate and provided with the rearwardly extending arm 61 carrying the spring-pressed pin 62 adapted to enter the slot 63 in the lower end of the stop-lever 10.

Pivotally mounted upon the screw-pin 64 between the spaced ears of the bracket 65 is the hub 66 of the starting lever formed with the lateral apertured arm 67 and depending arm 68 normally resting upon the rearward edge of the stop-lever 10. An adjacent depending arm 69 has secured to the side face thereof by means of the screw 70 the foot 71 of a forwardly extending rigid arm 72 having attached to its apertured outer end the upper extremity of a spring 73 connected at its opposite end to the pin 74 by means of which the starting lever is normally main tained with the arm 67 in its upper position by which the arm 72 yieldingly rests upon the stop-pin 75 projecting from the bracketarm.

Extending from the base of the arm 72 is the stud 76 having in its outer end the guidescrew 77 passing through the slot 78 in the rearward end of the link 79 whose opposite end is pivotally connected at 80 with the upper end of the latch or detent-lever 81 formed in its forward edge with the notch 82 to afford a latch-shoulder and pivotally mounted at its lower end upon the studscrew 83. The lever 81 has adjacent its fulcrum point the rearwardly extending hook 84 to which is connected one end of the spring 85 having its opposite end attached to the stud-screw 54 of the coupling lever arm 53. The spring 85 serves to normally draw down the coupling-lever arm 53 and thereby efi'ect the coupling of the arms 43 and 46 when in register or overlapping relation, while said spring also acts to yieldingly press the latch-lever 81 into operative relation with the arm 53' for prevention of such coupling action. a

The upper or outer extremity of the coupling-lever 50 has upon one of its faces a lateral wing 50 with an inclined operative edge normally lying within the path of movement of the lateral cam projections 86 upon the plates 87 adjustably secured upon the periphery of the cam-wheel by means of screws 88. By means of these cam projections the disconnection of the vibratory levers 43 and 46 is insured in each semi-rotation of the controlling cam, and thus disconnection is maintained so long as the starting lever 67 68 69 is in running position with the lateral arm'depressed, whereby the latch-lever 81 is enabled to snap into operative engagement with the couplinglever arm 53 for maintaining the couplinglever 50 retracted from engagement with the lever 43, as represented in Fig. 1.

When the. machine is at rest, the upper portion of the stop-lever 10 is thrown backwardly with its plunger-bar in engagement with the stopping cam, and; as represented in Fig. 2, the plunger-pin 26 is in its lower operative relation with the detent-lever 18 and the coupling lever 50 is in coupling relation with the vibratory levers 43 and 46. To start a stitching operation, the lateral arm 67 of the starting lever is drawn downwardly to running position, wherein it is manually held during a stitching period, thus forcing the stop-lever 10 into running position wherein it is engaged and detained by means of the detent-lever 18 i The forward movement of the starting lever arm 69 permits the advance of the link 79 under the action of the spring 85 to cause the detent-lever 81 to rest upon the side face of the coupling-lever arm 53. The succeeding engagement of the wing 50 by one of the cam projections 86 causes the disengagement of the coupling-lever 50 from the lever 43 and the rise of the lateral arm 53, which is detained in such retracted position by engagement of the detent-lever 81 therewith, the upward movement of the arm 53 being communicated by the pin 56 to the slide-bar 24 and hence to the plungerpin 26 which assumes an inoperative position above the stop-motion detent-lever 18, as represented in Fig. 1.

As the actuating lever 43 is vibrated by the controlling cam into and out of register with the coupling lever 50, the latter continues in its retracted position under the influence of the latch-lever 81, so that no vibratory movement of the rock-lever 45 46 is permitted for actuation of the threadcutting mechanism and the plunger-pin 26 maintains its elevated position above and out of operative relation with the detentlever 18. Thus the endwise movements of the plunger-pin imparted by the tripping points of the controlling cam are idle and ineffective in performing their normal function upon the detent-lever 18.

It will be observed that the holding force applied by the operator to the startinglever arm 67 need be only sufficient to counterbalance the impulse of the spring 73, the detent-lever 18 being permitted to remain in operative engagement with the stop-lever 10 during substantially the entire running period of the machine so as to sustain the impulse of the stop-lever spring 12.

When the starting lever is released to permit the machine to come to rest. it turns upon its fulcrum-pin 64 under the action of the spring 73 upon the arm 72, thus drawing backwardlv the link 79 and disengaging the detent-lever 81 from the coupling-lever arm 53 so as to permit the coupling lever to assume coupling relation with the vibratory actuating lever 43 under the action of the spring 85 as soon as the levers 4.3 and 46 come into register in the continued movement of the cam-wheel 31. The descent of *the coupling-lever arm 53 produces a like movement of the slide-bar 24 connected therewith, and hence of the plunger-pin 26 whose succeeding operative movement under the action of one of the tripping points 30 causes its engagement with and retraction of the detent-lever 18 to permit the stoplever 10 to move into a stopping position wherein its plunger-bar 9 assumes operative relation with the stopping cam 8 for the arrest of the main-shaft.

lVhile the present improvement is shown &

and described herein combined with the cutter-actuating and controlling means forming the subject of my said application, it is evident that the mechanism is susceptible of material modification within the scope of the invention by providing a more direct connection between the starting lever and the plunger-pin sustaining slide-bar 24L for shifting the latterinto and out of operative relation with the detent-lever 18. It is also evident that other means than those shown and described herein may be employed for operatively connecting the automatically acting tripping points with the stop-motion device, so long as the efi'ectiveness of the tripping means is manually controlled.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, in combination, a shaft, driving means therefor, a stop motion including a member movable to running position to establish the connection of said driving means with the shaft, means for holding said member in running position, tripping means normally effective to release said holding means, thereby permitting said movable member to move to stopping position, and means actuated by said shaft for rendering said tripping means ineffective.

2. n a sewing machine, in combination, a shaft, driving means therefor, a stop-motion including a member movable to running position to establish the connection of said driving means with the shaft, means for holding said member in running position, a continuously moving tripping element, connections between said tripping element and said holding means normally effective to release the latter, and means for said connections ineffective.

3. In a sewing machine, the combination with a shaft, driving means therefor, and a stop-motion including means for establishing and controlling the connection of said driving means with the shaft, of a member having a working position, a tripping point fiXed thereon, an element intermediate said member and the stop-motion for connecting said tripping point with the latter to the interruption of said connection between the shaft and its driving means, and manually controlled means acting automatically to shift said intermediate element out of the range of movement of said tripping point.

4. In a sewing machine, the combination with a shaft, driving means therefor, and a stop-motion including a controlling member having connected therewith means for establishing operative connection between the driving means and said shaft, and means for arresting the operation of said shaft, of a starting lever acting upon said controlling member for throwing the stop-motion into running position, means connected with said effect rendering member for tripping the stop-motion to arrest the operation of said shaft, and means connected with said starting lever and adapted to render said tripping means ineffective.

5. In a sewing machine, the combination with a shaft and a stop-motion comprising a spring-pressed vibratory lever carrying means for connecting said shaft with a source of power and means for arresting the operation of said shaft, of a starting lever for throwing said vibratory lever into running position, a detent for retaining said lever in running position, tripping means for said detent, and means connected with said starting lever and adapted to render said tripping means ineffective.

(5. In a sewing machine, the combination with a shaft and a stop-motion comprising a spring-pressed vibratory lever carrying means for connecting said shaft with a source of power and means for arresting the operation of said shaft, of a-starting lever for throwing said vibratory lever into running position a detent for retaining said lever in running position, a rotary cam provided with a tripping point an intermediate element between the range of movement of said tripping point and said detent, and a connection between the starting lever and said intermediate element whereby the latter may be temporarily maintained out of connecting relation between the tripping point and detent.

T. In a sewing machine, the combination with a shaft, driving means therefor, a stopmotion including a spring'pressed controlling member carrying a stopping element and a stopping cam mounted upon said shaft and adapted for operative engagement with said stopping element, a second cam mounted independently of but connected with said shaft, a tripping point fixed thereon, an element normally disposed intermediate said controlling member and the range of movement of said tripping point, and manually ontrolled shifting means for temporarily interrupting the normal operative relation between said intermediate element and the tripping point.

'8. In a sewing machine, the combination with a shaft and a stop-motion comprising a spring-pressed vibratory lever for controlling the action of the same, of a starting lever for throwing said vibratory lever of the stop-motion into running position, a detent for retaining said vibratory lever in running position, a rotary cam provided with a tripping point, an intermediate element between the range of movement of said tripping point and said detent, a connection between the starting lever and said intermediate element-wherebythe latter may be temporarily maintained out of connecting relation between the tripping point and de tent, and means independent of said vibratory lever of the stop-motion for retracting the starting lever and thereby causing said intermediate element to return to operative position.

9. In a sewing machine, in combination, a shaft, driving means therefor, a stop motion including a spring-pressed member movable to running position against the action.

of said spring to establish the connection of said driving means with the shaft, means for holdin said movable member in runnmg position, manually controlled means,

acting automatically when thrown into operation, for releasing said holding means, whereby said movable member may move to stopping position. 7

10. In a sewing machine, in combination, a shaft, driving means therefor, a stop motion mechanism operative when released to stop the machine, said shaft, connections between said moving part and said stop motion normally effective to release the latter when actuated bysaid moving part, and means actuated by said shaft for rendering said connections ineffective without stopping the machine.

11. In a sewing machine, in combination, a shaft, driving means therefor, a stop-motion including a member movable to running position to establish the connection of said driving means with the shaft, manually operated means for moving said member to running position, holdingmeans for retaining said mov'rble member in running position, automatically acting means controlled by said manually operated means and acting, when thrown into operation, to release said holding means, whereby said movable member may move to stopping position.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT F. FIFIELD.

\Vitnesses \VILLIAM L. BARRON, H. A. KORNEMANN, Jr.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Ifatents. Washington, D. C.

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