US230941A - George w - Google Patents

Description

'G. -W.'HUNTER. Stop Mechanism for Sewing Machines.-

No. 230,941. Patented Aug. 10,1880.

MFEIERS, PHOTULITHOGRAPHER. WASHINGTON. DAC.

ATTOIQIEY.

Un'rrn TaTns GEORGE W. HUNTER, OF VASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO ABRAHAM REX, OF PHILADELPHIA, PA.

STOP MECHANISIVI FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 230,941, dated August 10, 1880.

- Application filed January E27, 185'0.

'To all whom it may concer/n Be it known that I, GEORGE \V. HUNTER, a citizen of the United States, residing at Vashington, in the District of Columbia, have invented a new and useful Improvement in Stop Mechanisms for Sewing-Machines, which improvement is fully set forth in the following specification and accompanying drawings, in which- Figure l is a vertical section of the stop mechanism for a sewing-machine embodying my invention. Fig. 2 is an end view thereof, partly broken away.

Similar letters of reference indicate corresponding parts in the two figures.

My invention consists of means for stopping the needle-bar and shuttle-driver of a sewingmachine without stopping the power-wheel or treadle, as will be hereinafter set forth.

It also consists of means for preventing injury to the machine when it is abruptly stopped or subjected to strain, as will be hereinafter set forth.

Referring to the drawings, A represents the rotary shaft which, by means of suitable connections, operates the needle-bar, said shaft being properly mounted in the arm or neck A', and made hollow or partly hollow.

B represents the power wheel, which is 3o loosely fitted on said shaft, and is provided with pinsfshoulders; or lugs b, for engagement with the shoulders a ofa sli din g collar, C, after the manner of a clutch, said collar being fitted on the end of the shaft and secured thereto by means of a pin, D, which passes through the collar (l and a slot in the shaft, and is also attached to the outer end of a flat or torsional spring, E, located in the hollow of the shaft A.

F represents a rotary and sliding collar 4o placed on the shaft A within the neck A', and

secured tosaid shaft by a screw, d, which passes through a slot, e, in the shaft, and is also attached to the inner end of the torsional spring E, whereby said collar F and the collar C are connected.

To the shaft A, adjacent to the collar F, is secured a bevel-gear wheel, G, which meshes with a bevel-gear wheel, H, keyed or otherwise secured to the vertical shaft H', this shaft H' having its hearings on the arm or neck A' and operating the shuttle-driver, as usual and well known, said wheel H heilig' provided with a shouldered collar, J, as an integral or separate piece. A shouldered collar, K, is seemed to the shaft H' below t-he collar J, the shoul- 55 ders ofthe two collars J'K facing eachother.

The collar F on the shaft A has a circumferential groove,f, into which projects freely the upper bent or turned end of a lever, L,

whose lower end is sustained on the lower end 6o of the neck A' as a fulcrum. A spring, L', bears against the lever L, and is attached to the neck A', so as to press against said lever and thus force the collar F in the direction toward the bevel-gear wheel G.

M represents a cam which is in contact with the bearing-piece L" of the lever L, said cam being on a shaft, M', mounted horizont-ally on the neck A', and provided with a button, N,

on the outside of the neck, and by rotating 7o are in their normal or operative posit-ions the 8o wheel B and shaft A are connected as one by means of the collar C. Vhen power is coinmunicated to the wheel B the horizontal shaft A and needle-bar and the vertical shaft H' and connected parts of the sh uttle-driver are operated as usual. Vhen it is required to stop the machine the button N is turned so as to move the headed piece P to an engaging contact with either ofthe shouldered collars J K. The cam M, by its swell portion, moves back the lever L, which thus carries the collar F in a direction toward the wheel B. By means of the spring E as a connection the collar C is pushedoutward and disengaged from the wheel B, so that said wheel Brotates freely on the shaft A without imparting motion to said shaft A. The shaft Il' being stopped by the piece P also stops the shaft A, and thus the needlebar and shuttle-driver arc quickly at rest. In Fig. l the headed piece P is shown as being engaged with the lower collar, K.

When it is desired to operate the machine, or sew, the but-ton Nis again rotated, and the at portion of the cam M assumes such position in relation to the lever L that this lever, pressed by the spring L', returns to the first position and moves the collar F toward the gear-wheel G. The spring E, as the connection ot the collar F and collar C, moves with the collar F and draws the collar G into engagement with the power-wheel B, whereby the shaft A and said Wheel B are clutched and the shaft A again rotates, motion being also communicated to the shaft H' by means of the gear-wheels G H. The needlebar and shuttledriver now operate as usual.

As there are two collars, J K, on the shaft H', the button N may be rotated in either di rection and bring the headed piece l) in contact with either of said collars, so as to cause the stoppage of the shaft H' regardless of the direction of rotation ofthe button.

The shoulders a a of the colla-r C are separated sufficiently to allo1 some play of the sh aft in the collar. Should there be any strain on the shaft A or abrupt motion thereof in the direction opposite to that in which it is rotating, the collar G leaves its seat or gives, thus twisting the spring E Without att'ecting or injuring the gearing G H and connected parts.

Having thus described myinvention, What I claim as new, and desire to secure by Letters Patent., is-

l. The shaft A, collars F and C, means for connecting said collars, loosely-fitted power- Wheel B, shaft H', and gearing G H, in combination with lever L, shaft M', having button N and cam M, headed Ypiece P, and the shouldered collars J K on said shaft H', substantially as and for the purposes set forth.

2. The shaft A, in combination with looselyfitted power-Wheel B, the collars F and C, the torsional spring E, by which said collars are connected, and means ot moving said collars longitudinally to the shaft A, substantially as and for the purposes set forth.

GEO. YV. HUNTER.

Witnesses:

JOHN A. WIEDERsHEIM, A. P. GRANT.

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