US690304A - Stop mechanism. - Google Patents

Description

No. 690,304. Patented Dec. 3|, IQOI, F. T. LEILICH.

STOP MECHANISM.

(A pplication filed June 24, 1901.)

(No Model.)

WITNESSES.-

[N VENT OR.

a projection 8, extending into a cavity in the UNITED STATES I FRANCIS T. LEILICH, OF SAN FRANCISCO, CALIFORNIA.

STOP MECHANISM.

SPECIFZCATION forming part of Letters Patent No. 690,304, dated December 190i- Appliceition filed June 24, 1901.

To all whom, it WI/CI/Z/ concern:

Be it known that I, FRANCIS T. LEILIOH, a citizen of the United States, residing in San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Stop Mechanisms for Sewing-Machines and other Machinery, of which the following is a specification.

My invention relates to improvements in stop mechanisms for machinery, my object being to provide means by which the moving parts of the mechanism to which itis applied can be stopped quickly in a definitive position and without shock.

To this end my invention consists in the several matters hereinafter described and claimed.

My invention is particularly adapted to special sewing-machines and is shown as so applied in the accompanying drawings; but it is also capable of other applications.

Figure 1 in the drawings is a side elevation of a portion of a sewing-machine with my invention applied, partly broken away to show interior parts and also showing the stop mechanism in action. Fig. 2 is a plan view and shows the stop mechanism out of action and the driving mechanism in action. Fig. 3 is a front elevation of my invention detached from the machine and also broken away to show interior parts. Fig. 4 is a rear elevation of Fig. 3, but with the driving-pulley removed, the hub and stud upon it being shown in crosssection. Figs. 5 and 6 are front and rear elevations of a construction in which the resilient device hereinafter described is applied in a difierent form.

The driving mechanism is provided with the fixed and loose pulleys 1 2, over which a driving-belt 3 is moved by a belt-shifter 4, secured to the frame of the stop mechanism 5. The stop mechanism 5 is attached to a shaft 6, moving, as hereinafter described, in bearings 7 7 on the machine-frame, and is adapted to move easily on the outwardly-extended hub 1 of the fixed pulley 1. Pivoted to the stop-mechanism frame 5 is a stop lever 8, (shown in Figs. 1, 2, 3, and 4,) provided with stop-mechanism frame 5 through a gap 8 Fig. 4. This cavity contains a plunger 9, which is held against the projection 8 by a spring 10, bearing against a seat 11 at its lower end, the seat 11 serving also as a guide Serial No. 65,1387. (No model.)

to the plunger 9 at its lower end. The leverprojection 8 is held in a normal position by the upper part of the gap 8 against whichit rests, the gap 8 being sufficiently long to permit the necessary downward movement of the projection 8 due to the impact of the stud I on the fixed pulley 1. Over the free end of the stop-lever 8 is pivoted a recoil-lever 12, held normally in the path of the stud 1 by a spring 13. In Fig. 6 the path of the stud 1 when approaching the recoillever 12 is shown by dotted arcs, the arrow showing the direction of rotation. The stud 1 is shown in Fig. 6 in the position of displacing the recoil-lever 12. The spring 13 is secured at one end to a pin 13 set in the recoil-lever 12, and at the other to a pin set in the stop-mechanism frame 5. Thepin 13 also acts as a stop to the recoil-lever 12 by I contacting with a part of the stop-mechanism frame 5 when in its normal position, as shown in Figs. 1, 2, 3, 4, and 5.

In Figs. 5 and 6 is shown a construction in which the stopping of the moving parts is effected by a slide 15, moving in gibs in the stop-mechanism frame 5 and held in a normal position by a coil lever-spring 16, the lever end of which bears against a projection 15 on the slide 15, the coil being secured to the stopmechanism frame 5 in any suitable manner. Pivoted to the machine-frame, opposite the free end of the shaft 6, is a setting-lever 16,

provided with a projection 16, extending in the path of movement of the shaft 6, an extension 16 contacting when set with the bearing 7 to prevent the setting-lever 16 being drawn down too far by the spring 17, connecting it with the machine-frame, and a similar projection 16, extended in the path of a stop 18, secured to a disk 19, rotated by any suitable means from the driving-shaft.

A starting-lever 20, connecting with the shaft 6 by a stud 21 and pivoted at 22 to the machine-frame, is provided to move the stop mechanism out of action and the driving mechanism into action by lift-ing the free end of the lever 20 by any suitable means. spring 20 is interposed between the lever 20 and the machine-frame to quickly move the stop mechanism into action and throw the driving mechanism out of action when released, as hereinafter described.

In using a machine provided with this invention and in the position shown in Fig. 1,

with the stop mechanism in action, the operator lifts by any suitable means the free end of the starting-lever 20, which through the connections shown in Fig. 1 moves the stop-mechanism frame 5 and connected parts hereinbefore described away from the fixed pulley 1 and releases the stud 1", attached thereto, from its position as held between the respective free ends of the stop-lever 8 and recoil-lever 12, as shown in Figs. 1 and and simultaneously therewith moves the drivingbelt 3 from the loose pulley 2 to the drivingpulley 1. The starting of the driving mechanism communicates a rotary movement to the disk 19 and stop 18, attached thereto. The stop 18 is in consequence moved out of contact with the projection 16 upon the setting-lever 16", thus permitting the latter, carrying upon it the projection 16 to be drawn down by the spring 17 to its normal position, in which the extension 16 is in contact with the bearing 7 and the projection 16 is in contact with the end of the shaft 6. The driving mechanism will continue in action until the disk 19 and stop 18 have completed a revolution, when the stop 18 will contact with the projection 16 on the setting-lever 16, lift it, and release the projection 16 from contact with the end of the shaft 6 and permit the spring 20*, through the lever 20 and pivotal connection by the stud 21 to the shaft 6, to quickly move the stop mechanism into action and simultaneously therewith move the belt 3 from the fixed pulley 1 to the loose pulley 2, throwingthe driving mechanism out ofaction. The stud 1 on the fixed pulley 1 is carried forward by the momentum of the moving parts in the direction of the arrow shownin Fig. 6, first, striking against the side of the recoil-lever 12, held in its path by the spring 18, which being of just sufficient strength to hold the recoil-lever12 inits normal position, as hereinbefore described, is easily moved out of its path, and then upon the upper part of the stop-lever 8, compressing the spring 10, through the interposed parts 8 9, until the entire energyof moment um has been absorbed by the spring 10, when the latter will rebound, carrying with itthe parts 9, 8, and 8 to their normal positions and pushing the stud 1 on the fixed pulley 1 backward in its path of movement until it is arrested by the recoil- ]ever 12, which has meanwhile been returned to its normal position by the spring 13 and is thereby brought to a definitive stopbetweeu the recoil-lever 12 and the stop-lever 8. The relative position of the stud 1 at that-position in its rotation when the stop mechanism is thrown into action to its position when at rest between the ends of the levers 8 12 may be varied by changing the position of the stop 18 on the disk 19. For the purpose to which I have shown this invention as applied I prefer a release-point of about one hundred degrees from the stop position of the stud 1".

It is no part of my invention that the recoillever 12 shall reduce the momentum of the stud l by friction between them. I therefore make the spring 13 light and elastic and depend entirely on the spring 10 to absorb the energy of momentum of the moving parts and on the lever 12 to prevent the recoil of the stud 1 beyond a definitive point. The stop mechanism can be placed on a lever and moved to and from the fixed pulley 1, and a friction-pulley can be employed instead of the device shown without departing from the spirit of the invention.

The gist of my invention lies, therefore, in the combination of a rotating stud or shoulder secured to the driving mechanism, a resilient stop arranged to be brought into the path of the rotating stud to gradually arrest its motion, and means to limit its recoil and .in conjunction therewith to stop it at a definitive point, with. means for moving and holding the stopping mechanism out of action and the driving mechanism into action and for automatically throwingthestopping mechanism into action and the driving mechanism out of action.

What I claim, therefore, is-

1. The combination in a mechanism of the character described, of a driving mechanism, a fixed pulley provided with a stud or shoulder; a stopping mechanism having a resilient stop adapted when brought within the path of rotation of the said stud, to receive its impact, absorb the energy of its momentum and bring it to a definitive stop in conjunction with means, including a spring, to limit the recoil of the said stud; a device for moving and holding the said stopping mechanism away from the said fixed pulley during the operation of the driving mechanism; and means, including a spring, for automatically throwing the stopping mechanism into action, and for throwing the driving mechanism out of action, at predetermined times.

2. The combination in a mechanism of the character described, of a driving mechanism, a fixed pulley provided with a stud or shoulder, and a hub extended outwardly from the side of the fixed pulley; a stopping mechanism guided in bearings substantially parallel to'the driving-shaft and supported upon the said hub, the stopping mechanism having a resilient stop adapted when brought within the path of rotation of the said stud, to receive its impact, absorb the energy of its m0- mentum and bring it to a definitive stop in copjuction with means, including a spring, to limit the recoil of the said stud; a device for moving and holding the said stopping mechanism away from the said fixed pulley during the operation of the driving mechanism; and means, including a spring, for automatically throwing the stopping mechanism into action and for throwing the driving mechanism out of action at predetermined times.

FRANCIS T. LEILICH. W'itnesses:

H. G. LEILICH, N. E. W. SMITH.

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