US1417093A - Stopping mechanism for sewing machines, etc. - Google Patents

Description

G. E. MOLYNEUX.- STOPPING MECHANISM FOR'SEWING MACHINES, ETC.

APPLiCATlON FILED JULY25. l9l7- M4 1 'LQQ 3 m Patented. May 23, 1922.

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G. E. IVIOLYNEUX. STOPPING MECHANISM FOR SEWING MACHINES, ETC.

' APPLICATION FILED JULY|25. 1911.

, 1,411.09 W Patented May 23, 11922.-

@wn N G. E. MOLYNEUX. 1 STOPPING MECHANISM FORISEWING MACHINES, ETC.

APPLI CAT ION FILED JULY25; 1917.

1,417,09& Y Patented May 23,1922.

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o-nononn. MOLYNEUX, on navonnn, new JE.Jas

fiTOPPINGr MECHANISM FOR SEWING MACHINES, ETCL,

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Specification of Letters Patent. jigtt rgntpd MLQ 23 119122 AppIication filed July 25, llll'Y. Serial No. 182,603.

T0 at whom may (JONCHIW.

Be it known that I, Gnonos l6. Monrnnox, a citizen of the United States, and residing in the city of Bayonne, county of Hudson, in the State of New Jersey, have invented certain new and useful Improvements in Stopping Mechanisms for Sewing Machines, Etc of' which the following is a specification, reference being had to the accompany ing drawings, forming a part hereof.

In the operation of high speed sewingmachines and analogous machine-s, it is necessary to bring the machine to rest quickly but without excessive shock and with. the parts in predetermined positions, with the needle-bar of a sewing-machine in its highest position. Many stopping mechanisms have been designed to meet the requirements of such use, the action" of most of them being dependent upon the movement of al centrifugally controlled member so that the stopping mechanism shall not operate until the machine is slowed down to such an extent as to permit it to be stopped with out excessive shock. The present invention relates to stopping mechanisms of the general, character referred. to. The im in'ovcd mechanism not dependent, however, upon the movement of any centrifugally controlled member, but its operation is delayed for a period. of time following the discon nection of the. driving mechanism which is proportionate to the speed of the machine, so that it does not become operative until the machine is slowed down to a speedat which it can be stopped safely. The improved mechanism, moreover, is simple in construction and direct and certain in operation. The invention will be more fully explained. hereinafter with reference tothe accompanying drawings in which it is illustrated and in which,

Figure 1 is a view in elevation, with some parts in section, of so much of a sewing machine with its driving and controlling mechanism as is necessary to enable the invention to be understood.

Figure 2 is a view of the improved stopping mechanism in longitudlnalsectlon on the plane indicated by the broken hne 2-2 of Figure 3, looking in the direction of the arrows.

Figure 3 is a view in sectionon the plane indicated by thehroken line 3-3 of Figure 2, looking in the direction of the arrows.

Figure A} is a detail view in section on the plane indicated by the broken line 4llof Figure 3, looking in the direction of the arrows. I

Figure 5 is a detail view in section on the plane indicated by the broken line 5-5 of Figure 4, looking in the direction of the arrows.

, Figure 6 is a view in section on the plane indicated by the broken lineG-6 of Figure 2, looking in the direction of the arrows.

In the application of the invention illustrated in the drawings, the bed-plate a, of an ordinary straightaway sewingmachine. is provided with the usual arm I), which supports the driving-shaft c with its pulley (Z.

The latter is driven a cord d from a transmission device or driving means (i which iscontrolled, not only as to starting and stopping but as to its. speed, by a con trolling lever 6Z3, which is connected by a link (Z with a pedal (Z ln machines of this character the pressure of the operators foot upon the pedal (Z is required to start the machine and the speed is proportionate to theextent to which the pedal is depressed. .lVhenthe operators foot is removed from the pedal the transmission device is discon- .nected and the sewing-umchine continues to run by. its own momentum until it is stopped by the operation of the stopping mechanism, as will be described. i i ii i For the purpose of cushioning the stoplping of the machine a shock absorber of ordinary construction is provided. As shown in the drawings the pulley (Z is fixed upon the driving. shaft c, and mounted on the shaft, adjacent to the pulley and held thereto by screws 6, is a disk 6. A stoplug 6 for cooperation with the relatively fixed stop'lug hereinafter referred to, is secured to the disk 6 and pulley cl in such manner as to have a limited, rotary movement, having a neck 6 which travels in a concentric slot a formed in the disk 0, and a head 6 which stands between two springs a and 6 located in a recess 6 formed partly in the pulley and partly in the disk. The two springs c and e cushion the stop-lug and therefore the pulley d, the shaft 0, and their connected parts, respectively against the shock of stopping and the shock of the rebound.

Secured to the arm Z) is a block 7 and in the arm 6 and block fis mounted, so as to have a limited longitudinal movement, a stop-rod g which carries at one end the relatively fixed stop-lug 9. When the machine is running the S JOPJTOCl o drawn to the left, as shown in Figures 1, 2 and l, and the stop-lug is then clear of the path of the moving stop-lng 6?. but when the niachine to be stopped the stop rod is moved to the right so as to place the stop lug in the path of movement of the stop-lug (2 the movement. of the stop-rod being effected by a spring located in a chamber formed therefor in the block 7. The stop-rod has fixed thereto. at its other end. a hloclr which is connected by a bell-crank lever g" and a linh. with an interposed spring or yielding connection to the pedal (Z so that when the pedal is depressed to connect the transmission and start the machine the stop-rod will be drawn to the left so as to talre the relatively fixed stop-lug 9 out of the path of the moving stop-lug 6 Should the stopping mechanism become operative immediately upon the disconnec tion of the transmission, when the opera tors foot is removed from the pedal, breakage of some of the parts would be likely to occur. It is necessary, therefore, that the action of the stopping mechanism shall be delayed somewhat, in order that the momentum of the machine shall be partly overcome by friction and the speed be reduced before the operative engagement of the stop-lugs takes place. 13 or this purpose a detent is moved, when the machine is started, into the path of the movement of some part connected with the stop-rod so asto prevent the immediate movement of the stop-rod into stopping position when the operators foot is removed from the pedal, and provision is made whereby such detent is slowly withdrawn from its operative position. As shown the block is provided with a pin 9 and a plunger 7L is mounted in an air cylinder h which is provided with a restricted orifice 72F and is secured to the block f. The plunger is pressed down normally by a spring 72 which may be fixed in the block 7 and bear on the extended upper end of the plunger, which is formed to engage the pin and hold the stop-rod retracted, its descent being retarded by the air in th cylinder, which escapes but slowly. The extended upper end of the plunger 71, is raised into the path of the pin 9 so as to prevent the operative movement of the stop rod g by the movement of a lever 72 which is connected by a link it with an interposeil spring or yielding connection 723", with the pedal (Z Thereby, when the pedal. is depressed to start the machine and to withdraw the stop-lug g from the path of the stop-lug the plunger 72 is raised so that it shall stand in the path of movement of the pin 9 and prevent the operative movement of the stop-rod. The yielding connections in the links 9 and 7e permit the relative movemei'it of the stoprod and the plunger without the blorlrinn of our by the other.

it has already been statci'l that the speed of the machine is proportionate to the extent to which the pedal is depressed. and as the plunger 72, of the dashpot is raised to an extent proportionate to the depression o l' the pedal and therefore to the speed of the machine, the time required for the complete descent of the plunger. and therefore for the release of the stop-rod, will also be propoi tionate to the speed of the machine. and the greater the speed of the machine the longer will be the time afforded for the slowing down. so that the engagement or ronnrw tion of the relatively stationary member and the rotatable member will not be effected un til the speed has been reduced to such an. extent as to permit the stopping to be effected without danger of breakage. The size of the vent [L2 of the dashpot may be varied to suit the requirements of different machines.

The mode of operation of the improved stopping mechanism has been snilicicntly described and will not require further explanation. It will be obvious that various changes in details of construction and arrangement may be made to suit different conditions of use and that the invention is not limited to the precise construction shown and arrangement herein.

I claim as my invention:

1. In a stopping mechanism, the combination of a relatively stationary member, a rotatable member, means to effect positive connection of said members, and a dashpot in operative relation with the connecting means to retard the operation thereof.

2. In a stoppingmechanism, the combination of a relatively stationary member, a rotatable member, a stop-rod movable to efiect operative connection of said members,

a detent for said stop-rod, means to move the detent out of operative relation with the stop rod. and a dashpot in operative relation with said detent to retard the movement thereof.

3. In stopping mechanism, the combination of a rotatable member carrying a stop-lug, a relatively stationary member. a stop-rod movable longitudinally in the role tively stationary member, and having a stop-lug, a detent to prevent movement of the stop-rod, means to move the detent out f operative relation with the stop rod, and a dashpot in operative relation with the detont to retard the movement thereof to release the stop-rod.

4:. In a stopping mechanism, the combination of a relatively stationary member, a rotatable member, a stop-rod movable to effect operative connection of said members or disconnect same, means to move said stop- El ii ill!) rod to disconnect said members, means to move said stop-rod to effect operative connectionoi' said members, a detent to prevent movement of the stop-rod to eiiect operative connection of said members, means to move the detent into operative position,

means to move the detent from operative position, and a retarding device to retard the movement of the detent. y

5. In a stopping mechanism, the combination of a relatively stationary member, a rotatable member, a stop-rod to effect operative connection of said members, a detent to prevent movement of the stop-rod, a single controlling means for effecting operative movement of the stop-rod and the detent, and independent, yielding, operative connections between the controlling means and the stop-rod and detent.

6.In a stopping mechanism, the combination of a relatively stationary member, a

rotatable member, a longitudinally movable stop-rod,a spring tomove the same into the influence of its sprin operative position, a spring-pressed detent moved by its spring into inoperative position and movable in opposition to its spring, to prevent movement of the stop-rod under a single controlling pedal, and independent connections between said pedal and the stop-rod and detent to move the same in opposition to their actuating springs.

7. In a stopping mechanism, the combination of a relatively stationary member, a rotatable member, a longitudinally movable, spring-pressed stop-rod, a spring-pressed detent to prevent movement of the stop-rod under the influence of its spring, a single controlling pedal, and independent connec tions between saidpedal and the stop-rod and detent to move the same in opposition to their actuating springs, said connections including each a yielding member.

This specification signed this 23d day of July, A. D. 1917. I -GEORGE E. MOLYNEUX.

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