US220964A - Improvement in overseaming attachments for sewing-machines - Google Patents

Description

Y a. H. W. CURTIS; Oversearhing Attachment fof'Sewing-Maohines.

No; 220,9 4. Patented'Oct. 28, 1879.

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UNIED STATES PATENT OFFICE.

GEORGE H. WV. CURTIS, OF BROOKLYN, N. Y., ASSIGNOR TO WHEELER 8t \VILSON MANUFACTURING COMPANY, OF BRIDGEPORT, CONN.

IMPROVEMENT'IN OVERSE A MING ATTACHMENTS FOR SEWlNG-MACHINES.

Specification forming part of Letters Patent No. 220,964, dated October 28, 1879; application filed March 1, 1879..

and 5 are back views of the switch-plate, showing the switch in different positions. Fig. dis a top view of the throat-plate, and Fig. 7 is a cross-section of the supporting-plate, switchplate, and switclntaken on the line mm of Fig. 5.'

My invention relates to that class of devices or attachments which are applied to sewingmachines to adapt them to overseam the edges of fabrics or to stitch button-holes; audit has for its object the production of a cheap and efficient attachment, which may be readily applied to many of the various sewing-machines employing a straight needle-bar with but little change, said attachment being adapted to perform the service above stated in a complete and economical manner.

To this end my invention consists in the peculiar construction and combination of a needle-bar, switch, switch-plate, springywand supporting-plate, as hereinafter described, and specifically pointed out in the claim.

Referring to the accompanying drawings, in which like letters designate like parts in all of the figures, A is the head, B the needle-bar, and B the presser-bar of a sewing-machine, which may be of any ordinary or suitable construction. I have shown, however, in the drawings my improvements applied to the Wheeler & Wilson No. Smaehine, to which it is specially adapted.

The necdle-bar B, which slides in suitable hearings in the head of the machine, 'is cut away on opposite sides at the point I), where itworks through the lower bearing, to admit of alateral movement being given to the same during its vertical reciprocation. This reciprocation is imparted to the needlebar from the operating-cam, in the usual manner, by the needle-lever, connected at its forward end to the said needle-bar by the collar E, rigidly secured thereto, said collar E being provided with the pin F, which is adapted to operate the switch 0 and switch-plate D, the latter being pivoted, near its lower end, to the supporting-plate A, secured to the head of the machine.

As shown in the drawings, plate A is formed of a piece of sheet metal, having its upper end bent over at a right'angle to its'side, and being provided in such bent portion with an aperture, which is so formed relative to the other portions that it may be passed over the needle-bar and rigidly secured in place by means of the oil-cup screw at the upper bearing ofthe needle-bar. This supporting-plate A is provided with a curved slot, H,-through which and the slot H in the switch-plate projects a pin, 0, fixed to the switch 0, which is pivoted to the upper end of the switch-plate D.

To the front side of the supporting-plate A is secured a spring, G. This spring Gr engages the pin 0, fixed to the switch'O, and serves to press said switch against the pin-F on collar E, and thus effect the lateral movement of the needle-bar, and also to throw and retain the point of said switch in such positions that the opposite sides thereof will be engaged by the pin F at each alternate upward movement of the needle-bar.

The needle-bar B is, as before described, cut away or flattened on opposite sides at the point b, to admit of the lateral displacement of the same in its lower bearing. This displacement is, however, only for a sufficient time to enable the point of the needle to enter the cloth;

after which, as the whole or rounded part of said needle-bar reaches the lower bearing, said needle-bar is returned to its original vertical position, so that the needle will correctly engage the hook or shuttle beneath the bed-plate of the machine.

In order to admit of the lateral movement of the needle-bar, the needle-hole J in the throat-plate I is elongated, as shown in Fi 6, and the hole in the presser-foot is also similarly formed.

The operation is as follows: Just before the needle enters the material, pin F on collar E strikes switch 0 on the right side, pressing needle-bar B over to the ri ght, so that the thread is carried off the material and down through the button-hole, when the loop is formed and taken up by the rotating hook, or its equivalent, as usual. As needle-bar B rises, pin F comes up on the left sidcof switch 0 and pushes switch-plate D over to the right, and spring G on supporting'plate A throws the point of switch 0 to the left. Pin F on collar E strikes switch 0 on the left side, pressing needle-bar 13 over to the left, so that the thread is laid over and upon the material the distance of the lateral play of the needle before it enters the material. The pin F next ascends on the right side of switch 0, and pushes switch-plate D

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