US1033534A - Gearing. - Google Patents

Description

J. BURKS.

GEARING.

APPLICATION FILED APR.6, 1911.

1,033,534. Patented July 23,1912.

2 SHEETS-SHEET 1.

J2me; Burk? COLUMBIA PLANOGRAPH co., WASHINGTON. 1). C1

J. BURKS.

GEARING.

APPLICATION FILED APILB, 1911. 1,033,534. Patented July 23,1912.

' 2 SHEETS-SHEET 2.

ammwwtoz o/ames BM 7W3 JAMES BURKS, OF KORAN, LOUISIANA.

GEARING.

Specification of Letters Patent.

Patented July 23, 1912.

Application filed April 6, 1911. Serial No. 619,332.

To all whom 'it may concern:

Be it known that I, JAMES Bunxs, a citizen of the United States, residing at Koran, in the parish of Bossier, State of Louisiana, have invented certain new and useful Improvements in Gearing; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sewing machines more particularly to spring motor driven sewing machines.

An object of the present invention is to equip a sewing machine with a train of gearing for transmitting the power from the spring motor to the sewing mechanism, this train of gearing by virtue of novel adjustably mounted ournal boxes being capable of stepping up or stepping down the speed of the sewing mechanism.

A further object of the invention is to provide a novel form of stirrup by means of which the operator may stop or start the spring motor.

lVith the above objects in view the invention consists in certain novel details of construction and combination of parts hereinafter fully described and claimed, it being understood that various modifications may be made in the minor details of construction within the scope of the appended claims.

In the accompanying drawing forming part of this specification :F igure 1 is a front elevation of a sewing machine equipped with a spring motor and transmission gear.- ing embodying my improvements. Fig. 2 is a cross sectional view taken on the line 22 Fig. 1. Fig. 3 is a cross sectional view taken on the line 33 Fig. 1. Fig. 4 is a fragmentary perspective view showing the construction of one of the shaft boxes. Fig. 5 is a fragmentary perspective view showing the construction of the stirrup. Fig. 6 is a fragmentary view in elevation showing the crank construction.

Referring now to the drawing in which like characters of reference designate similar parts, a sewing machine is shown comprising a table 10, sewing mechanism 11, and leg frames 12 supporting the table, each leg frame comprising spaced legs connected by a plurality of transversely disposed cross braces 13. A pair of bearing boxes 14 are mounted on the uppermost cross braces of the leg frames and the opposite ends of a shaft 15 are journaled in these boxes, this shaft being equipped with a band wheel 16 which underlies the driving wheel 17 of the sewing mechanism and which is coupled to the latter by a flexible leather belt 18 or the like. A gear 19 is removably secured to this shaft, and forms means for driving the shaft. A practical method of mounting the gear is to provide the shaft with a longitudinal groove in which a set screw or similar fastener threaded through the hub of'the gear fits, unloosening of this set screw permitting of the gear being slid off from the end of the shaft and replaced wit-h a larger or smaller gear as the case may be in order to step up or step down the speed of the sewing mechanism. The journal boxes 14 are equipped with set screws 20 which work in grooves or the like formed in the opposite ends of the shank and when these set screws are loosened, the shaft may be slid bodily through the journal boxes in order to permit of the removal of the gear 19.

Formed in the intermediate cross braces of the legs are vertically disposed slots 21 in which are slidingly fitted journal boxes 22, a groove 23 being formed in one wall of each slot to receive a rib 24; formed on one side of the related journal box whereby to guide the sliding movements of the box. A set screw 25 threaded through the lower edge of each intermediate cross brace bears against the underneath face of the related journal box and forms means for moving the box vertically in its slot.

The opposite end portions of a shaft 26 v are ournaled in the sliding journal boxes and this shaft is equipped with a gear 27 which meshes with and drives the gear 19. It is now clear that should the gear 19 be replaced with a smaller gear than usual, the set screws 25 may be a vanced in order to move upwardly the shaft 26 bodily and permit of the gear 27 meshing with the smaller gear. If the gear 19 is replaced with a larger gear than ordinary, the set screws 25 are retracted, permitting of the gear 27 moving bodily downward and meshing with the larger gear, this meshing of the gears positively preventing jumping up of the journal boxes 22.

A spiral spring 28 is fixed at its inner end to the shaft 26, and at its outer end to the inner wall of a rectangular casing 29 which is slidingly supported between spaced studs 30 formed on the intermediate cross brace of that leg frame remote from the gears above described. One end of the shaft 26 projects considerably beyond its journal box and is equipped with a crank handle 30, which forms means for winding the spring, a ratchet wheel 31 being fixed to the shaft and a spring controlled pawl being arranged to operativoly engage this ratchet wheel and prevent unwinding of the spring during the winding operation, this pawl being released after the winding ope ation is finished "to permit of the spring unwinding and rotating the shaft 26.

It is evident that upon the release of the pawl 32, the spiral spring will immediately con'n'nence to unwind and drive the sewing mechanism through the train of gearing above described, and to permit of stopping this train of mechanism a stirrup 33 is provided with a cylindrical stein 34L which is journaled in a suitable opening formed in a strut 36 which connects both leg frames of the sewing machine adjacent their lower ends. The upper end of the shank terminates in a square head 37 which engages with the teeth. of the ratchet wheel 27, this head normally being held in engaged position by a helical. spring 58 the opposite terminal convolutions of which bear against the confronting faces of the strut and head as clearly shown in Fig. 5. When it is desired to start the sewing mechanism, it is simply necessary to insert the foot in the stirrup and bear down, thereby releasing the head from engagement with the gear 27.

e The stirrup is held eluding a supporting frame,

on said frame, a pair of oppositely disposed 55 ournal boxes on said frame movable bodily toward and away from said driven shaft, a

erativ-e connect-ion between said 7 guides on said frame ad acent to one of said 60 in this depressed posit-ion while a: continued actuation of the sewing mechanism is desired, the foot being removed from the stirrup to permit of the head of the stirrup shank moving back into 40 engagement with and stopping the train of r gearing when stopping of the sewing mechanism is desired.

What 18 claimed, is 2- l. A power transmission mechanism ineluding a support-mg frame, a driven shaft on said frame, a driving shaft on said frame adapted to he slid bodily toward and away from the driven shaft, an operative connection between said shaft-s, ried by the driving shaft and slidably fitted on guides carried by said frame.

:2. A power transmission mechanism in a driven shaft driving shaft journaled in said boxes, an op shafts,

journal boxes, and a motor carried by said driving shaft and slldably engaglng said guides.

In testimony whereof, I affix my signature, in presence of two wltnesses.

JAMES BURLS.

\Vitnesses LOUIS BURKE, Bos'r l-IALNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

and a motor car-

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