US313802A

US313802A - Trimming attachment for sewing-machines

Info

Publication number: US313802A
Authority: US
Publication date: 1885-03-10
Anticipated expiration: 1902-03-10

Description

(No Model.)

J. BIGELOW. TRIMMING ATTACHMENT FOR SEWING MAGHINES. No. 313,802. Patented Mar. 10, 1885 lUNirnn Sra rns PATENT tries.

JOHN BIGELOW, or PHILADELPHIA, PENNSYLVANIA.

TRllVllVllNG ATTACHMENT FORSEWING ll/IACHINES SPECIFICATION forming part of Letters Patent No. 313,802, dated March 10, 1885.

(No model.)

To all whom it may concern.-

Be it known that 1, JOHN BIGELOW, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Trimming Attachments for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to the construction of a shear trimming device adapted to sewing-machines, and more particularly to the position and method of securing the stationary blade.

The construction of the upper blade is practically the same as shown in my application filed June 5, 1879.

Figure l is an end View showing upper blade, rock-shaft, lower or stationary blade, and its holding device. Fig. 2 is a plan View. Fig. 3 is a rear view showing the position of the stationary blade. Fig. 4 is a detail View of the crank. Fig. 5 is a diagram showing position of stationary blade.

The cutting-edges of the blades A and B, Fig. 1, are placedin the usual relation to each other to make a shear or draw out. The upper blade, B, is attached to the anglepiece 13, Fig. 1, which in turn is secured to the rock-shaft (1, having bearings at D and G, Fig. 2. The shaft 0 is shouldered at 0'. It is surrounded by a coil-spring, F, one end of which presses against the shoulder G and 0 the other end against the loose bearing G.

A crank, E, surrounds the shaft 0 at E", and can be set in any position on the same by means of the clamp-screw E, Fig. 4. The crank E receives avibrating movement at E' from any suitable moving part of the machine. The lower or stationary blade, A, is a long plate having one of its ends A cut off at an acute angle and sharpened to a shearedge.

In order to save the necessity of hollow grinding the blade is placed in a laterally and longitudinally inclined position, as shown in Figs. 3 and 5. This position tends to make its cutting-edge incline away from the cutting-edge of the blade B. To avoid this, the plate or blade A is set at an acute angle to the cutting-line, as shown at A in. Fig. 5, K K being the cutting'line, A A" the cuttingedge of the blade A, and ,A A K an enlarged view ofthe acute angle to which I have referred. The shaft 0, carrying the upper blade, is raised sufficiently high in its bear ings to allow the blade A to pass under it, as shown in Fig. 1. The blade A can be held in position in the manner shown in my application of June 5, 1879, or by the block H and screw H shown in the drawings.

The operation of the mechanism is that of most shearing devices. The blade B is vibrated by its connection with the rocking shaft 0, and its cutting-edge V is kept against the cutting-edge A of the lower blade, A, by the action of the spring F pressing at C on the shaft 0. V

This device has its stationary hearing attached to the workplate of asewing-machine at F, and its bearing D adjustably attached through the slotted openings shown in Fig. 2. The cutting-edges are just behind the sewingneedle, and can be set in any desired relation thereto by the set of the bearing D.

I claim 1. A stationary seam-trimmer blade having its body set at an acute angle to a vertical plane, within which said blades cuttingedge and the vibrating blade are located, in combination with a vibrating blade and the work-plate and stitch-forming mechanism of a sewing-machine, substantially as described.

2. In combination with the stitch-forming mechanism of a sewing machine, a shear trimming device consisting of a vibrating blade and a stationary blade, the latter arranged to be adjusted forward in a direction at an acute angle with a vertical plane, within which said blades cutting-edge and the cuttingedge of the vibrating blade are located, substantially as described.

8. In combination with the stitch-forming mechanism of a sewing-machine, a trimming device consisting of a vibrating blade, and a stationary blade which is a long plate having neath said rock-shaft at an acute angle to a vertical plane, within which said blades cutting-edge and the cutting-edge of the vibrating blade are located, substantially as described.

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

\ JOHN BIGELOW.

Witnesses: G. W. BALLOOH, L. DEnNE.