US246765A - Button-hole attachment for sewing-machines - Google Patents

Description

(ModeL) J. K. HARRIS.

BUTTON HOLE ATTAGHMENT FOR SEWING MACHINES.

Petented Sept. 6, 1881.

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UNITED STATES PATENT UEEICE.

JOHN K. HARRIS, OF SPRINGFIELD, OHIO.

BUTTON-HOLE ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 246,765, dated September 6, 1881.

Application filed November 16, 1880.

To all whom it may concern Be it known that I, JOHN K. HARRIS, of Springfield, in the county of Clarke and State of Ohio, have invented a new and useful Improvement in Button-Hole Attachments for Sewing-Machines, of which the following is a specification.

My improvements relate generally to attachments for sewing-machines for feeding the material with a lateral movement, while at the same time a forward or back feed movement is given, as required in working in button-holes.

The improvement relates specially to the mechanism for reversing the movement of the feed-bar and giving to it a side swing, so that on the return movement the second row of stitches shall be at the required distance from the first row.

In the accompanying drawings, forming part of this specification, Figure 1 is avertical longitudinal section of my improved button hole attachment. Fig. 2 is a plan view of the same with the cap-plate removed to showthe racks and pinion more clearly. Fig. 3 is a cross-section on line 00 a: of Fig. 1-. Fig. 4 is a crosssection on line y g of Fig. 1. Fig. 5 is a perspective view of the cap-plate and the cranks for shifting the eccentrics. Fig. 5 is a bottom view of the cap-plate, and Fig. 7 represents the clutch for moving the pinion.

Similar letters of reference indicate cdrresponding parts.

The operative mechanism is carried by a bedplate,A, shaped to suit the machine with which it is to be used, and formed with a needle-hole or slot at one end and cut away on the under side to allow full play of the feed-bar.

To the bottom of plate A is attached a plate, a, the same being a duplicate of the shuttlerace slide used in the Domestic and similar sewing-machines, so that the button-hole attachment can be readily attached to the machine by removing the usual shuttle-race slide and inserting the slide a, that carries the attachment.

B is the feed-bar, formed with a needle-slot, I), at one end, and with a slot, 0, at or near its mid -length, into which latter slot enters a guide-lug, d, that projects upward from and is pivoted to a lever, c, hung on plate A by a pin, a. At the side of needle-slot b, pads f, of india- (Model) rubberorotherelasticmaterial,arefitted,which pads, bearing on plate A, form the pressuresurface to hold the goods. Above slot b is aslotted plate, 9, pivoted to lugs g of bar B, 5

and formed with flanges 1 that extend through slot 1) at either side to bear on the material.

'5 is a cam on a shaft hung in lugs g, so that the cam can be turned to bear on plate g, and

press the flanges in contact with the ma- 6o terial for holding the material smooth. The plate 1 is released by turning the cam -shnft when the material is to be put in place or removed. 4

In side flanges, d, of plate A a crank-lever arm It, so that the angle between them can be 7o varied for varying the time of feed according to the stroke of the needle and for adjusting the lateral oscillation of the feed-bar. The outer end of arm is slotted, as shown at k,

to pass upon the needle set-screw or a projection of the reciprocating needle-bar, and the slot 70 may, if desired,be formed in aseparate piece fitted adjust-ably on arm 7:.

Upon arm I of lever O a rocker, m, is hung by a'pin, m, as shown most clearly in Fig. 4..

The two ends of rocker m are bent downward toward lugs e, that project from the ends of lever c, which carries the guide d of the feedbar.

The feed-bar B, at its rear end, is formed with parallel racks 12, above which, in a slot of the feed'bar, is an apertured block, a, Figs. 2 and 3, carried by a cap-plate, 0', attached to side flanges of plate A. Upon this cap-plate is fitted a disk, It, carrying a cylindrical boss, h, 0

tubular arbor, 71/ carrying at its upper end a 9 5 handle, 0 above which is a nutthat clamps the parts together, while on the lower end of arbor k is an eccentric, q, entering the recess of block a. Through the arbor It extends an arbor, 0, its lower end resting on a step-plate, I00

1), fixed to bed-plate A, to which the arbor is held by a screw tapped into the upper end of arbor h The arbor 0 carries a pinion, p, be tween the racks n, and below them a clutchpulley, 1.

Around boss h of disk h is placed a loose ring, t, formed with ahandle, t, and provided with a projecting pin, a, that is in the path of a pin, it, projecting from handle 0 The ring t is formed with a slot, through which a setscrew passes into disk h, so that the ring is adjustably connected thereto, and the disk can be turned by the handle it to throw the arbor 0, block it, and consequently the pinion and racks, to either side. I use the handle t for adjusting the ring t simply, and provide the pins to u, as mentioned, so that by moving handle 0 both eccentrics shall be moved.

The clutch-pulley 1' is fitted with ajointcd strap, r, having an arm. 8, pivoted to said strap and jointed to a slide, 8, that extends forward beneath a lug, v, projecting from crank-lever C. The slide 8 is recessed to receive the end of lug 11, so that the slide shall be reciproeated by the movement of the cranklever, and to regulate the movement the slide 8 is fitted at one end of its recess with a setscrew, 4;, which limits the play of the lug in the recess, thereby regulating the feed movement.

Beneath the step-plate p is pivoted a forked arm, 10, having its forward ends extended at opposite sides of lever e and provided with inclined lugs to, that project upward at opposite sides of the feed-bar B. r

The operation is as follows: The vibration of lever O, acting on slide 3, gives reciprocation to the slide, which, in turn, acting by the clutching-strap 0", gives intermittent movement to pulley 1', arbor 0, and pinion p, and the feed-bar B is fed forward or back, according to which rack is engaged by the pinion. As the arm L of lever G rises, the rocker on being turned so that one of its ends shall come in contact with one lug of lever e, the leveris swung on its pivot and turns feed-bar B sidewise on pinion p as a center, so that both forward and side feed is given to the material. The swing of lever e at the same time moves arm 20 in a direction opposite to movement of bar B, and one lug, w, is thereby brought behind the depressed end of rocker m, so that as arm Z of lever O moves back on the descent of arm k this log 10' will rock lever m and depress its opposite end. Then feed-bar B is swung back and arm w moved again to rock the lever m to the first position. At the end of the button-hole the forward movement of bar B is arrested by turning the handle 0. To move the racks and to bring the pinionp to the center position a stitch or two will then be made, to form the end of the button-hole, and the bandleo then moved to engage the other rack, and the operation will proceed with the feed movement reversed.

With some goods the movement of bar B by handle 0 the distance allowed by the space between the racks is sufficient to separate the two lines of stitches; but when a wider side feed is given, by adjusting crank-lever G, the eccentric boss h is used to shift both the racks and pinion. This is accomplished by adjustingthe ring t to bring its pin u into position then as handle 0 is turned its pin u strikes pin u, and thereby the disk h is turned.

The change in direction of feed can be per formed without stopping the machine.

The present invention is an improvement upon that heretofore obtained by me and numbered 235,235.

Having thus described my invention, I

claim as new and desire to secure by Letters cam h, tubular arbor h, carrying cam q, handle 0 provided with pin u, block n, racks n, arbor 0, and pinionp, combined substantially as shown and described, for operation as set forth.

3. In button-hole attachments for sewingmachines, the recessed slide 8, having adjust in g-screw v, clutch-pulley 1', jointed strap r,

and arm 8, combined with the arbor of the feed-bar and operating-lever 0, provided with lug v, substantially as shown and described.

JOHN K. HARRIS. Witnesses:

' A. R. OOBAUGH,

J. D. RODGERS.

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