US783605A - Feed mechanism for sewing-machines. - Google Patents

Description

N0. 783,605. PATENTED FEB. 28, 1905.

(I. BIGELOW.

FEED MECHANISM FOR SEWING MACHINES.

APPLIOATIUN FILED NOV. 10, 1904.

ltl'o. veaeos.

lln'iriso Sara res Patented February 28, 1905.

JOHN BlGELUl V, U1 MlNNEAPULlS, iVHNNlChlOP/t.

SPECIFICATION forming part of Letters Patent No. 783,605, dated February 28, 1905.

Application filed November 10, 1904. Serial No. 232,113.

To It who/It 71f IN/(01] (30/006770:

Be it known that l, JOHN Bronllow, of Minneapolis, county of Hennepin, Stnteof Minnesota, have invented certain new and useful improvements in Feed Mechanism for Sewinglvlachines, of which the following is a speciiication.

This improvel'nent relates to the reciprocating feed n'iecl'ianisn'i of a single-thread sewingmachine in which a looper is used for making successive forward loops of the sewing-thread and in which all of the movements of the feeddog are obtained from two eccentrics on the driving-shaft of the macl'iine.

The objectof the invention is to furnish the mechanism referred to with means for stopping the forward action of the feed at any point desired, thus permitting the needle to enter the same hole in the goods a few times and by making a few loops in the air and drawn tight to fasten the end of the seam. Afterward any gaged length of stitch is automatically resumed. I

In the accom mnying drawings, forming part of this specification, Figure l is a plan view of a feed mechanism, showing my improvements. Fig. 2 is a side view of the same. Fig. 3 is a detail.

The feed mechanism shown is positively operated in all of its movements by two eccentrics on the driving-shaft of the machine.

To the frame 1 of the machine is pivoted the rocker 2, to which the feed-bar 3 is pivoted at its rear end, the forward end of said bar being forked to embrace one of said eccentrics, which then imparts positive np-and-dow1'i movement to said bar. To the feed-bar, near its end, is pivoted a yoke 4, which is forked or slotted to embrace the other of said eccentrics, the forward end of said yoke being jointed to a link 5, which in turn isjointed to a feedregulatin lever 6 near the free end of the latter. The yoke and link form a toggle, and when the regulating-lever is adjusted so that the part of said lever to which the link is jointed is on a level, or nearly so, with the pivot by which the yoke is joined to the feed-bar said yoke as the eccentric rotates therein will Vibrate vertically on its pivot, imparting little or no horizontal movement to the feed-bar;

but when the free end of the regulating-lever is depressed to bring the points of connection of the link therewith more or less below the point of connection of the yoke and feeicl-bar, and thus shorten the distance between these two points, the yoke as it moves vertically will also be forced more or less horizontally, and will thus impart horizontal or forwardand-back movements to the feed-bar.

The screw 7, which connects pivotally the link with the fced-regulating lever 6, projects through the latter as a pin 7, which rests on the adjustable feed-gage 8. This feed-gage 8 has a shaft 8, which passes through the frame 1 and has on its free end the friction-spring 11 and zuljustment-piece E). The friction-spring ii is placed on said shaft 8 under tension between the frame 1 and adjustment-piece 9 for the purpose of holding the gage S lirmly wherever it may be set. By setting the adjustable piece 9 for any desired number of stitches to the inch the gage 8 will be correspomlingly set, and through the pin 7 resting on said gage the feed-regulating lever 6 is also set. The feed-regulating lever (5, through the resilient pressure of the spring 10 acting on its shaft-bearing, is kept pressed downward in the direction for making the longest stitch which insures that the pin 7 will be kept in contact with the gage 8 wherever set. The lever b and its pin 7 may, how ever, be lifted against the pressure of its spring 10 up and away from its gage 8 to the position described, where no stitch at all will be made; but as soon as released by the resilient action of the spring 10 it will return to and its pin 7 be held against the gage The 'leed-re 'ulating lever (3 has two arms .12 and 12 projecting from its pivotal end. The one .12 by hitting against the work-plate at twelve stitches to the inch prevents a longer stitch, while the other end, 12, is arranged to stop the movement of said lever at a point where there will be no forward-andbackward movement of il 3 feed-that is, the action of the yoke-eccentric will be neutralized.

l claim as my invention 1. .l n a single-thread reciprocatingfeed sewingmachine, the combination with the driving-shaft, having two eccentrics, of a feed-bar carrying a feed-dog and forked to embrace one of said eccentrics, a rocker to which said bar is pivotally connected, a yoke jointed to said feed-bar and embracing the other of said eccentrics, an adjustable gage, a regulating-lever having a free pivotal connection with the frame of the machine, a spring engaging said lever and holding it against said gage, an indicator to show the position at which said gage is set, said lever being free to be moved away from said gage to a position where it will be on a level, or nearly so, with the pivot by which the yoke is joined to the feed-bar, and a link connecting said lever with said yoke, substantially as and for the purpose set forth.

2. In a singlethread reciprocatingfeed sewing-machine, the combination with the driving-shaft having two eccentrics, of a feedbar carrying a feed-dog and forked to embrace one of said eccentrics, a rocker to which said bar is pivotally connected, a yoke jointed to said feed-bar and embracing the other of said eccentrics, an adjustable gage, an indicator to show the position at which said gage is set, a regulating-lever limited in its movements by said gage, but'free to be moved away from said gage to a position where it will be on a level, or nearly so, with the pivot by which the yoke is joined to the feed-bar, a spring engaging said lever and holding it against said gage and a link connecting said lever with said yoke, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand this 7th day of November, 1904.

JOHN BIGELOW.

Witnesses:

(J. (Jr. HANsoN, A. (3. PAUL.

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