US808914A - Buttonhole attachment for sewing-machines. - Google Patents

Description

PATENTED JAN. 2, 1906.

F. J. FREDA. 'BUTTONHOLE ATTACHMENT FOR SEWING MACHINES.

APPLIOATION FILED DEC). 27, 1904.

UNITED STATES- PATENT OFFICE- FRANK J. FREDA, OF DETROIT, MICHIGAN.

Specification'of Letters Patent.

Patented Jan. 2, 1906.

Application filed December 2'7, 190i. Serial No. 238,878.

To all whom it may concern:

a plane transverse tothe feed, so as to form the uttonholing-stitch. To reinforce the buttonhole, it is advantageous to employ a gimp which is embraced and covered by the stitches of the machine, and to further reinforce the inner ed e of the buttonhole a second thread is loopetI about the stitches, said thread being carried by the thread-guide above referred to.

In the drawings, Figure 1 is aperspective view of a portion of the sewing-machine to which my improvement is applied. Fig. 2 is a rear elevation of a portion of my improvement, showing both positions of the guide.

A is the reclprocating needle-bar, which is secured in bearings in the head B and is operated by mechanism (not shown) for alternating its path of descent, as indicated by full and dotted lines. 0 is the thread engaging the needle D, carried by said bar, and E is the thread-guide for the reinforcingthread.

To produce the desired stitch, it is necessary that the guide E should be shifted alternately upon opposite sides of the needle-bar and with its thread-delivering end in advance of the needle i. 6., beyond the same in the direction of feed of the-work. It is also necessary that this guide be shifted when the needle-bar is down, thereby necessitating a curved path of movement. This movement is produced by mechanism of the following construction F is a reciprocatory bar which extends horizontally of the machine and is operated at one end by any suitable mechanism. (Not shown.) The timing of the mechanism is such as to roduce one complete reciprocation of the ar F for each alternate reciprocation of the needle-bar.

G is a lever pivotally secured at H to the head B of the machine and pivotally connected at I to the end of the bar F. This lever is formed-in two sections, and the lower section J thereof is pivotally connected at K to the upper section, so as to swing in a plane transverse to the plane of movement of the lever as a whole.

L is an antifriction-roll secured to the lower end of the member J, and M is a slotted cam secured to the side of the head B and engaging the roll L. The shape of this cam is substantially as illustrated, the slot inclining outward from opposite sides of the center a, so as to produce an angular or substantially segmental path of movement of the roll L in a horizontal plane.

N is an arm secured to the member J and projecting outward and downward therefrom. The thread-guide E is secured to the lower end of this arm N, and by reason of the movement imparted to the member J by the cam M said thread-guide is shifted through a segmental path. To form the desired stitch, it is necessary that the thread in the guide E be drawn, and this is accomplished also by the arm N in cooperation with stationary thread-guides O on the head B.

In operation the reciprocation of the bar F shifts the guide E through a segmental Eath to be upon opposite sides of the needlear during alternate o erations thereof. This will hold the thread ed from the ide E in proper position for forming the 00p, and during the shifting movement of the guide the thread will be arranged to be drawn in, which forms the reinforcement for the inner edge of the buttonhole.

What I claim as my invention is 1. In a buttonholing-machine, the combination with a reciprocatory needle-bar, of a thread-guide shiftable through a segmental path, to be alternately upon opposite sides of said needle-bar and mechanism for shiftin said guide, comprising a vertically-arrange lever mounted on a stationary pivot, said lever having its lower end universally movable in a horizontal plane, a connection between the lower end of said lever and the threadguide, means for reciprocating said lever and means for guiding the lower end thereof in an angular course.

2. In a buttonholing-machine, the combination with a reciprocatory needle-bar, of a thread-guide shiftable through a segmental path, to be alternately upon opposite sides of said needle-bar and mechanism for shifting said guide comprising a vertically-arranged lever, formed in two sections, the lower section being pivoted to the upper section to swing in a plane transverse to the plane of movement of the lever as a whole, means for reciprocating said lever connected to the upper section thereof, a connection between the lower section of said lever and the threadguide, and means for guiding the lower end of said lever through an angular course.

3. In a buttonholing-machine, the combi nation With a reciprocatory needle-bar, of a thread-guide shiftable through a segmental path, to be alternately upon opposite sides of said needle-bar and mechanism for shifting said guide, comprising the reciprocatory rod F, the lever G to which said rod is attached, the lower section J of said lever, pivoted to the upper section to swing in a transverse plane, the arm N connecting the section J with said thread-guide, the slotted guideplate M and the antifriction-roll L on the seetionJ for engaging the slot in said guide-plate.

In testimony whereof I affix my signature in presence of two Witnesses.

FRANK J. FREDA.

WVitnesses EDWARD D. AULT, H. 0. SMITH.

Images