US470281A - Sewing-machine - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1.

y J. BOLTON.

SEWING MACHINE.

No. 470,281. Patented Mar. 8, 1892.

munilllllllm u 'me News PETERS co., Pncmrumo., wAsNmumw. u. c.

(No Model.) 3 Sheets-.Sheet 2. J BOLTGN SEWING MACHINE.

Nvo. 470,281. Patented Mar. 8,- 1892.

(No Model.) 3 Sheets-Sheet 3.

J. BOLTON. SEWING MACHINE.

No. 470,21. Patented Mar. 8, 1892.

NrrED STATES ATENT OFFICE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 470,281, dated March 8, 1892.

I Application filed July 19, 1890. Serial No. 359,279. (No model.)

To all whom it may concern:

Be it known that l, JAMES BOLTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specilication, reference being had therein to the accompanying drawings.

My invention has forits object to provide a look-stitch sewing-machine which is simple in construction, so that it may be cheaply manufactured, and which, while light-running, is strong and positive in operation, so that it is capableof high rates of speed.

In the drawings, Figure 1 isa sectional side elevation of myimproved machine. Fig. 2 is a bottom view thereof. Figs. 3, 4, and 5 are sections on lines 3 3, 4: 4, and 5 5, respectively, of Fig. l, looking in the directions 0f the arrows adjacent to said lines. Fig. 6V is afront end view of my machine. Figs. 7, 8, and 9 are detail views of the shuttle mechanism, and Fig. 10 is a detail view of the shuttle.

A denotes the work-plate, B the'bracketarm, and C the driving-shaft journaled in the upper portion of said arm and provided near its rear end with the crank c for operating the feed and shuttle mechanisms and at its forward end with acrank-disk c, having a crankpin c2, entering an ordinary heart-cam d, attached to the needle-bar D.

The bed-plate is provided on its under side with suitable brackets a, throughwhich are tapped center screws a', serving as pivots for the shuttle and feed-operating rock-shafts E and F. The crank c is connected by a pitman C with the rear arm f of the rock-shaft F,said shaft carrying near its forward end an arm or segment f2, provided with a camgroove f3 and also with a rib f, extending at aright angle from said segment, and to which rib the shuttle-driver g is pivotally attached by a screw or pin g', the shuttle-driver having a horn g2 to enter avl recess near the nose of the shuttle Il and a lip or ilange g3, which abuts against the heel of the shuttle. The vertical shuttle-race 7L is on the inner face of the web a2, cast on the bed-plate, and is cut into said web, so as to form a projecting or overhanging lip h', Fig. l, against which lits a segmental flange 7a2, Fig. 10,

formed on the outer or face side of the shuttle and curved to correspond to the curvature of the shuttle-race. It will be observed that the shuttle-driver stands up vertically, so that the centrifugal pressure of the shuttle against vthe overhanging lip h of the shuttle-race is counteracted by gravity or the weight of the shuttle, and thus the friction of the shuttle against the shuttle-race is reduced to a minimum and little or no oil will therefore be required to lubricate the shuttle in its race. It will also be obvious that the shuttle vibrates in the arc of a comparatively small circle, so that its motion is a smooth and easy one, thereby avoiding the vibratory jar incidental to long shuttle-carrying levers and adapting my machine to high rates of speed. The shuttle is loosely held between the horn g2 and the lip or flange g3 of the driver andthe race h, and also between the floor of the driver and the overhanging lip h of the shuttlerace, the said lip co-operating in connection with the curved flange h2 on the shuttle to prevent the latter from rising in the race, as will be obvious.

The shuttle Il has a straight lower face and I a curved upper face or edge which is the true arc of the circle in which the said shuttle vibrates, the straight lower face meeting the curved upper face at the point of the shuttle, so that the said point is close up against the shuttle-racc and can thus take the loops of needle-thread without requiring the needle to descend as low as 'would otherwise be necessary, and thus a comparatively short needle may be employed. In other words, my shuttle is what is known as a high-pointed one.

Owing to the fact that the shuttle-driver is pivotally attached to the rib f of thesegment f2 by the screw or pin g', the said driver may be turned slightly on the pin or screw by the operator when the shuttle is at its eXtreme forward position, as indicated by Fig. 7, with its nose slightly below the lower forward end of the shuttle-race. This slight turning of the shuttle-driver by the linger of the operator on said screw or pin clears the heel of the shuttle from the lip h of the shuttle-race, as shown in Fig. 8, and when the shuttledriver is thus turned the shuttle may readily IOO be removed from or inserted in the driver.

Whenthe driver starts on its backward movement after the shuttle has been placed therein,

the contact of the vertical front face of the shuttle with the vertical face of the shuttlerace swings the driver back to its normal po sition, in which it will at all times remain during the operation of the machine.

To cheapen the construction of my machine, as well as to avoid the friction incidental to the use of a cam-operated or lever take-up, I prefer to use in connection with 1o my vertically-operated vibrating shuttle a needle-bar take-up. To this end I have attached to the heart-cam d, by which the needle-bar is operated, a plate fz', having two slotted thread-eyes t" extending outward through slots 7c in the face-plate K. On the face-plate between the said slots t is a stationary cam or projection nz, formed in the present instance by making a V-bend in a plate m',

which is attached to the face-plate by a screw zo The upper end of the plate m is turned over and downward to form the hook m2, beneath which is housed the upper end of a retaining-spring n, also secured in place by the screw k2. The retaining-spring n presses c 5 against the plate m at its upper end above the projection m only, and is properly bent, so as to leave a thread-space between itself and the said plate m', excepting above said projection.

lith the usual throw to a needle-bar having a take-up thereon suiiicient lift would not be given to the thread to clear it from the heel of the vertically-vibrating shuttle before the latter quite completes its forward 3 5 movement. It is for this reason that the cam or projection my, over which the thread is drawn by the thread-eyes fi', is required, the said projection taking up suiiieient slack during the early part of the upward movement 4o of the needle-bar to draw the loop of needlethread away from the heel of the shuttle when the latter is in the forwardly-moving position shown by Fig. 3 and before the forward movementof the shuttle is quite cornpleted. It is necessary to clear the loop of needle-thread from theheel of the shuttle before the latter is far enough forward to draw its own thread taut, for the reason that as soon as the shuttle-thread is drawn taut the 5o shuttle is pulled back against the rear flange g3 of the driver, and if the loop of needlethread has not escaped from the shuttle before this occurs the needle-thread is liable to be broken. In other words, the said cam or 5 5 projection m gives the needle-bar take-up the right timing to properly draw up the slack of the loops of needle-thread passing around my vertically-vibrating shuttle, and therefore has a peculiar co-operation therewith. XVhen the 6o needle-bar descends, the thread-retaining spring n, pressing on the plate m', holds the needle-thread up, so thatit will draw through the eye of the needle until the said eye enters the work,when the friction on the thread will be sufcient to draw the thread from beneath the light pressure of the thread-retaining spring, thus permitting the needle to draw down sufficient thread to properly form the loop for the shuttle in the usual manner.

Pivoted at a3 to one of the brackets a is a rocker J, provided with a curved slot y, said rocker being pivotally connected at o with a link o', jointed at o2 to the pitman C. The rock-shaft E is provided near its rear end with an arm e, to which is jointed a link p, the free end p of which is jointed to a block p2, fit-ting in the slot j of the rocker J, said link being provided near its middle with a slot p3, into which extends a pin q, carried by a bell-crank feed-regulating lever Q, pivoted to a rib on the under side of the work-plate. By means of the said regulating-lever the free end of said link p may be raised or lowered to bring its pivotal connection with the rocker nearer to or farther from the pivotal point a3 of the said rocker to vary the rocking movements of the shaft E. The feed-bar R is jointed to the arm c at the forward end of the shaft E, and thus the throw of the feeddog is governed by the extent of the rocking movements of said shaft. The feed-bar is raised and lowered positively by the cam on the arm or segment]I2 of the shuttle-operating rock-shaft F, said feed-bar having a rollerstud extending into the groovef3 of said cam.

The feeding mechanism just above described is not herein claimed, being embraced by my application, Serial No. $359,280, filed simultaneously herewith.

I claiml. In a sewing-machine, the combination, with a bracket-arm and work-plate, the latter provided with a vertical shuttle-race 7L, having an overhanging or horizontal lip 7L', of the main shaft journaled in said bracket-arm and having the crank c, the needle-bar operated by said shaft, the longitudinal rock-shaft F below the work-plate and having the arm f at its rear end and the arm or segment f2 near its forward end, the pitrnan connecting said main shaft with said rock-shaft, the shuttledriver carried by said arm or segment f2, and the vertically-vibrating shuttle fitting loosely between said driver and the said overhanging or horizontal lip 7i', said shuttle having the curved Harige 7a2, fitting beneath said lip.

In a sewing-machine, the combination, with the needle-bar and its operating mechanism, of the longitudinal rock-shaft F, provided with the vertical segment f2 near its forward end, said segment having the rib j" extending at a right angle therefrom, the shuttlc-driver g, pivot-ally attached to said rib and having the horn g2 and fiange g3, the curved vertical shuttle-race h, having the horizontal or overhanging lip 7L', a shuttlehaving a curved upper portion loosely fitting beneath said lip, said shuttle-race terminating above or rearward of the point of the shuttle when the latter is at its extreme forward position to permit the pivoted shuttle-driver to be turned slightly for the purpose of enabling the sluittle to be inserted in or removed from the said driver.

IOO

3. In a sewing-machine, the combination,

with the needle-bar and its operating` meehanism, of the rook-shaft F and means for actuacting it, the 'vertically-vibrating shuttle operated by said rook-shaft, the take-np eyes moving with said needle-bar, the face-plate having the take-up cam or projection m, the retaining-spring n, loosely overlying said cam or projection, but bearing against-a cao-operating friction-surface above the latter, whereby the needle-thread will be drawnjrom the

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