US367315A - Freeland w - Google Patents

Description

(No Model.)

V F. W. OSTROM.

CUTTING MECHANISM FOR BUTTON HOLE STITGHING MACHINES.

7 No. 367,315. Patented July 26, 1887.

UNITED STATES PATENT OFFICE. I

FREELAND -W. OSTROM, OF BRIDGEPORT, CONNECTICUT, ASSIGNOB TO THE WHEELER & \VILSON MANUFACTURING COMPANY, OF SAME PLACE.

CUTTING MECHANISM FOR BUTTON-HOLE-STITCHING .MACHlNES.

SPECIFICATION fcrming part of Letters Patent No. 367,315, dated July 26, 1887.

Application filed May 20,1886. Serial No. 202,734. (No model.)

To aZZ whom, it may concern.-

Be it known that I, FREELAND W. OSTROM, of Bridgeport, county of Fairfield, and State of Connecticut, have invented an Improvement in Cutting Mechanism for Button-Hole- Stitching Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

Prior to this invention the throat-plate employed in sewing-machines for stitching and cutting button-holes has had a needle-hole and a slit in communication therewith for the passage of the cutteremployed in the formation of the button-holev slit, as shown in United States Patent No. 303,454, and the said throatplate, as therein shown, has been provided with a plate acted upon by a spring, the edge of the said plate next the said slit serving to partially close the said slit, but moving aside under the action of the descending cutter. The chief object of the said spring-actuated or yielding plate was to prevent the passage of the goods through the slit in'the throat when being acted upon or cut by the cutter, the edge of which is beveled, the beveled edge of the cutter com ing in contact with the edge of the said plate.

In practice I have ascertained by experiment that it is essential to the best working of a cutting mechanism composed ofor having a reciprocating cutter or blade located normally above the material and a cooperating plate below the material that the plate below the material be made adjustable with relation to the cutting-edge of the cutter or blade above 7 the material, and to effect this adjustment is the chief object of my invention. In accordance with my invention I hav provided the throat-plate at that side of the slit therein opposite the said spring-plate with an adjustable cutter-plate.

The cutter-carrying bar described in the patent referred to was extendedthrough bush-' ings placed in usual hearings or guides such as employed for guiding the prosser-bar; but

'in practice I have ascertained that it is neces sary to adjust the cutter-bar so that theedge ofthe cutter or blade carried by it may be readily made to occupy a position not only parallel with the stitching for the opposite sides of the stitched button-hole, but also cen-.

tral with relation to thestitches forming the sides of the button-hole.

To provide for the adjustment ofthe cutter or blade centrally with relation to the stitched button-hole is also one of the features of my present invention, the device herein shown by which to effect the said adjustment being an eccentric bushing. V H

Figure 1 in front elevation shows asufficient v portion of a button hole stitching machine to enable my invention to be understood; Fig. 2, a side elevation of Fig. 1; Fig. 3, a section in the'line x m, Fig. 1, through the device for adjustingthe cutter-bar. Fig. 4 showsthethroat- 6 plate detached; Fig. 5, an under side view of the throat-plate; Fig. 6, a section of Fig. 5 in the line 00' 00,- Fig. 7, a vertical section of the eccentric bearing, to be referred to; Fig. 8, a vertical section of the upper bearingof the cutter-bar, and Fig. 9 a modification of the throat-plate.

Referring tothe drawings, A represents the bed or cloth plate of the machine; A, part of actuating rock-shaft; A, its arm; A, alink;

2A a needle bar; a, the needle; B, a rotary hook; b, a cutter-carrying bar; b, a cutter attached thereto, and C and C, the members of a cloth-holding clamp, and e an upper sleevelike bearing, all substantially as in the Patent No. 303,454 referred to. j

The cutter-carrying bar b, just above the point where the cutter or blade I) is attached to it, has a bearing whereby the said cutterbar may be so adjusted as to place the edge of the cutter or blade centrally with relation to thetwo lines of stitching to constitute the sides of the button-hole slit and so, as to be in line with the needle when the latter is in position to penetrate the material held by the clamp at the inner line of stitching of one of the sides of the button-hole; and herein to secure such adjustment for said bearing in the simplest form I have shown the bearing as made as an 5 eccentric sleeve, as at d.

To obviate cramping of the cutter-bar when adjusted, I have provided the bearing (1 (see Fig. 7) with an annular projection, as at d, and the upper slceve-like bearing, 6, (which is IOO slotted at one side in usual manner, or as in the Patent No. 303,454 referred to,) is in turn provided internally with an annular hearing, I

e. The throat-plate c has a needle-hole, c, and leading from the said needle-hole is a slit, 0, for the passage of the cutter or blade I). The said throat-plate has connected to it a plate, 0", with which cooperates a spring, 0, the edge of the said plate during the descent of the cutter or blade in the said slit yielding to the thickness of the said cutter or blade. At the opposite side of the slit 0 (the cutting side) I have mounted upon the throat-plate a cutting-plate, f, to cooperate with the edge of the cutter or blade I), the said cutting-plate f being adj ustably attached to the said throatplate by screwsf in slotsf". (See Fig. 5.)

The cutting-plate is made adjustable with relation to the edge of the cutter or blade b, in order that the said cutter or blade and cutting-plate may be in proper line to correctlyco-operate in cutting the material, and to also compensate for wear in grinding the edge of the said cutting-plate.

A throat-plate such as shown in my said Patent No. 303,454, when so dulled as to fail to work properly with relation to the upper cutter or blade, had to be thrown away; but with a throat-plate having a detachable and adjustable cutting-plate the latter plate has only to be removed and re-dressed.

In Fig. #1 the plate 0 and the cuttingplate f are so shaped at their contiguous edges that portions of the said two plates come in contact, whereby the plate o always follows the adj ustment of the cuttingplate.

In Fig. 9 I have, however, shown a modification of my invention wherein the said two plates do not contact the one with the other.

It will be noticed that the junction of the cutting-plate fwith the body of the throatplate at 4 is somewhat removed from the needle-hole, in order to prevent the possibility of the thread entering the said joint between the cutting-plate and the throat-plate. Herein the material held by the clamp is stitched while the clamp is moved under the needle, as provided for in my Patent No. 803,453, and as the stitching for each button-hole is nearly or about completed the cutter or blade 1/ is caused to descend quickly and cut the material centrally between the line of stitching constituting the sides of the buttoirhole, the cloth at such time being held under the needle in position for stitching.

I clain1 1. In a button-hole-stitehing machine, the combination, with a cloth-clamp and a vertically-slidiug cuttercarrying bar, of a bearing for the latter adjustable at right angles to the line of the longitudinal movement of the said bar, whereby the edge of the cutter or blade may be adjusted centrally with relation to the stitching constituting the sides of a buttonhole, substantially as set forth.

2. In a button-hole-stitching machine, the combination, with a cloth-clamp, of a vertically-sliding cutter-carrying bar and an adjustable eccentric bearing for the latter, provided with an internal annular projection to prevent the said bar from cramping when adjusted, substantially as set forth.

3. In a button-holc-stitching machine, the combination, with a cutter 01 blade and means to actuate it, of a throat-plate having a needlehole, and also a slit for the reception of the said cutter or blade in line with said hole, and an adjustable plate forming the cutting side of said slit, substantially as set forth.

4. In a butt0n-holestitching machine, the combination, with a cutter or blade and means to actuate it, of a throat-plate having a needlc-hole and also a slit for the reception of the said cutter or blade in line with said hole, an adjustable plate forming the cutting side of said slit, and a yielding or spring-actuated plate forming the opposite side thereof, substantially as set forth.

5. In a button-hole-stitching machine, the combination, with a cutter or blade and means to actuate it, of a throat-plate having a needle-hole,and also a slit for the reception of the said cutter or blade in line with said hole, and an adjustable plate forming the cutting side of said slit, the said adjustable plate being at a distance from the said hole, whereby the thread is prevented from catching in the joint, substantially as set forth.

6. In a button-hole-stitehing machine, the

combination, with acutter or blade and means to actuateit, of a throat-plate having a needlehole, and also a slit for the reception of said cutter or blade in line with said hole, an adjustable plate forming the cutting side of said slit, and a yielding or spring-actuated plate forming the opposite side thereof, the latter plate for a part of its length being in contact with the said adjustable plate, so as to follow up the adjustment of the latter, substantially as set forth.

I11 testimony whereoflhave signed my name to this specification in the presence of two subscribing witnesses.

FBEELAND W. OSTROM.

\Vitnesses:

G. W. GREGORY, F. CUTTER.

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