US334718A - noble - Google Patents

Description

2 SheetsSheet 1.

(No Model.)

G. H. NOBLE. TRIMMING ATTACHMENT FOR SEWING MACHINES. No. 334,718.

tented Jan. 19, 1886.

Inv @7125?" W l/Zlms as N, PETERS. FhOln-Llkhngnpher. Washingloh. D. C.

(No Model.) 2 SheetsSheet 2.

G. HUNOBLE. TRIMMING ATTACHMENT FOR SEWING MAOHINES.

No. 334,718. Patented Jan. 19, 1886.

TJNHTED STATES PATENT Orrrca.

GEORGE H. NOBLE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE WVILLCOX 8t GIBBS SEWING MACHINE COMPANY, OF NEWV YORK, N. Y.

TRIMMING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 334,718, dated January 19, 1886.

Application filed July 14, 18852.

To all whom it may concern.-

Be it known that I, GEORGE H. NOBLE, of Providence, in the county of Providence and State of Rhode Island, have invented a new and usefulImprovementinTrimming Attachments for Sewing-Machines, which improvement is fully set forth in the following specification.

This invention relates to trimming attachments for sewing-machines for trimming the fabric simultaneously with the sewing, and has reference more particularly to shear-trimmers having one stationary blade or cutter and one vibratory blade or cutter, the two co-operating with each other like the blades of an ordinary pair of shears.

It consists, mainly, in the particular construction and arrangement of the trimmerblades, whereby greater efficiency and durabilityin the attachment are secured, but comprises also certain details of construction of other parts, and certain combinations of the various elements, as hereinafter more fully set forth.

The vibratory blade is carried by a rockshaft, and is formed of a thin plate or strip of metal ground on the lower end to form a cutting-edge. It is clamped between the parts of a split head on the end of the rock-shaft, and is adjustable lengthwise therein, so that as fast as its cutting-edge is worn away a new edge can be ground thereon and the blade set forward asufficient distance to compensate for the part worn away. A similar adjustment to compensate for wear is given the lower or stationary blade, which consists of a long bar or strip arranged parallel to the feed and ground at its front end on a bevel to form the cutting-edge inclined upward from the clothplate. The said bar or strip is made adjustable lengthwise or in the direction of the feed, so that it can be advanced or set forward as fast as worn away in sharpening the cutting edge.

The rock-shaft, carrying the vibratory blade, is supported in suitable bearings in a trim mer frame or casting secured to the cloth-plate of the machine, and receives its motion from an eccentric on the main shaft through a bent lever or arm, which is adjustably secured to the said rock-shaft. The trimmer frame or casting is also adj ustably secured to the cloth- Serial No. 66,737. (No model.)

plate of the machine, so as to be capable of adjustment at right angles to the line of feed, so that the trimmer may be arranged to operate at different distances from the line of feed.

In the accompanying drawings, which form a part of this specification, is represented a trimming attachment embodying the present invention and, applied to a sewing-machine, which may he of any ordinary or suitable con: struction. The one shown is the well-known WVillcoX & Gibbs single-thread chain-stitch machine.

Figure 1 is a plan view; Fig. 2, a front, and Fig. 3 a side elevation, and Fig. 4 an elevation, partly in section, through the eccentric, looking toward the left, Fig. 1.

In Fig. 2 the stitch-forming devices and the parts of the machine above the cloth-plate, with the exception of the trimming mechanism, are not shown.

A is the main shaft of the machine; B, the cloth-plate; C, the trimmer-frame; D, the rockshaft, having hearings in said frame; E, the

vibratory, and F the stationary, blade or cutter. The blade E is formed of a thin strip of metal having a cutting-edge at its lower end. The edges of the plate are beveled and set in a dovetailed groove in the head d on the end of rock-shaft D, the head being split nearly through. The screw d clamps the blade firmly between the two parts of the head. The cutting-blade may be removed for sharpening by loosening the screw (1, and as fast as worn away to form a new edge the said blade can be adjusted lengthwise to the proper position with reference to the stationary blade. The blade F consists of a long bar or strip running through a groove in the trim mer-frame C, parallel to the line of feed, and at its front end is beveled toward the cloth-plate at f, and a cutting-edge ground thereon. When the cutting-edge is dulled, it may be sharpened by grinding on the beveled part f, and the bar moved forward to its proper position. TVhen properly adjusted lengthwise with reference to the upper blade, it is clamped in the groove in the trimmer-frame by set-screws 0.

Motion is communicated to the rock-shaft D, carrying the vibratory blade E, from an eccentric, G, on the main shaft A, through a link, pin 9 and a bent arm or lever, H. The bent arm or lever H is adj ustably secured to the rock-shaft by aset-screw, h. The blade E is set at a slight angle to the rockshaft, so that in closing it will cross the blade F, and in order to allow the blade E the slight side movement necessary the shaft D has a limited endwise movement in its bearings, and is combined with the spring (Z surrounding the shaft and tending to keep the blades in contact. When the blade E is at or near its highest point, the shoulder formed by the head (1 comes in contact with the end of the frame and acts as a stop to take off the pressure of the spring (1 and prevent further end movement of the shaft D.

The trimmer-frame O is secured to the clothplate by means of ascrew, G, passing through a slot, 0 in said frame, a washer, 0 being interposed between the frame and the head of screw 0. The frame is kept from turning about the screw 0 by means of two steady-pins, c c, tapped into the cloth-plate and entering grooves on the under side of the frame. To adjust the attachment so as to trim at different distances from the seam. the screw 0, and

also the screw it, holding the lever H to the rock-shaft, are loosened, and the frame, carryingwith it the rock-shaft and trimmenblades, is moved in the desired direction, and when brought'to the proper position the screws 0 and h are tightenec During the operation of sewing and trim ming the work is clamped against the lower blade by means of the roughened holding-finger k on the presser-foot K, and the cuttingblades act slightly in the rear of the needle, the trimmed-off strip being guided over the rock-shaft by the inclined frame.

Where knit goods are being sewed, the edges of which have a tendency to curl over, the upright curved projection on the presser-foot acts to prevent the curled-over edge coming in the way of the needle; but neither this device nor the roughened fin ger 7c are of my invention.

It is obvious that instead of having the lower blade set parallel to the line of feed and the upperblade at an angle, as shown, this arrangement could be reversed, the upper blade being parallel and the lower one inclined with reference to the line of feed.

Instead of attaching the vibratory blade E to the head (2 in the manner shown, it could be attached in other ways-as, for instance, by screws, clamping it against the end of said head.

Although I have shown my improvements in connection with a trimming attachment which embodies improvements described in Letters Patent No. 255,57 8, granted to the assignee of S. Berton and O. H. Willcox on the 28th of March, 1882, they could as well be applied to other trimming attachments of ordinary construction, and I would observe that no claim is made herein to matter described and claimed in the said patent of Borton and Villcox.

Having now fully described my said invention and the manner of carrying the same into effect, what I claim is 1. The combination,withasewing-machine, of a trimming attachment comprising a stationary cutter-bar adjustable in a line parallel with the feed-movement in said machine and a cooperating movable cutter or shear blade, substantially as described.

2. In a combined sewing and trimming machine, or sewing-machine with trimmer attachment, the stationary cutter-bar having the cutting-edge at one end and the said end beveled or inclined, in combination with means, as explained, for securing said bar in place and for permitting its adjustment in a line parallel with the feed-movement, substantially as described.

3. The combination of the trimmer-frame, rock-shaft having bearings in said frame, vibratory blade carried by said rock-shaft, and stationary blade adj ustably secured in a slot running transversely through said frame in a line parallel with the feed-movement, sub stantially as described.

4. The combination of the trimmer-frame, adjustably secured to the cloth-plate of the machine,the roclcshaft carrying the vibratory blade, and the stationary blade adjustable lengthwise in said frame, substantially as described.

5. The combination, with the sewing-machine, of the trimmer-frame, rock-shaft, and blades or cutters, the stationary blade or cutter being adjustable in a line parallel with the feed'movement, and the whole attachment adjustable in a line at right angles to thefeed, substantially as described.

6. In combination with the tri'inmerframe, adjustably secured to the cloth-plate of the machine, the rock-shaft journaled in bearings in said frame, the bent lever or arm adjust ably secured to the rock-shaft and connected with the operating mechanism of the machine, the stationary shear-blade secured to the frame and adjustable longitudinally in a line parallel with the feed-movement, and the vibratory blade secured to the rock-shaft, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' GEORGE H. NOBLE.

\Vitnesses:

CYRUS OARLETON, GrmRLns A. SMITH.

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