US556940A - Trimming attachment for sewing-machines - Google Patents

Description

(No Model) C. G. BUTZ! TRIMMING ATTACHMENT FOR SEWING MACHINES.

No. 556,940. Patented Mar. 24, 1896.

AMMIRW B GRAHAM.PHOTD-UVHG-WASHINGTBMRC.

UNITED STATES PATENT Orricn.

CARL G. RUTZ, OF BROOKLYN, NElV YORK.

TRIMMING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 556,940, dated March 24, 1896.

Application filed November 9, 1896. SerialNo. 568,388. (No model.)

To all whom it may concern:

Be it known that I, CARL G. RUTZ, of Brooklyn, New York, have invented an Improved Trimming Attachment for Sewing-Machines, of which the following is a specification.

This invention relates to a trimming attaclunent for sewing-machines of the class illustrated in Patent No. 369,658, granted to me September 6, 1887. In that patent is described a cutter that is actuated by the need1e-bar of the sewing-machine, and which trims the raw edge of the fabric while the latter is being stitched parallel to such edge. The motion of this cutter must be exceedingly rapid, as the cutter must open and close once during the formation of every stitch. Owing to this rapid motion of the cutter it is of great importance to so lubricate it that it will not become overheated and thus inoperative.

The present invention relates to the means for lubricating the cutter and also to the corn struction of the cutting mechanism generally.

In the accompanying drawings, Figure 1 is a side elevation of a sewing-machine provided with my improved trimmer. Fig. 2 is a plan of the trimmer; Fig. 3, an end view thereof; Fig. 4:, a plan, partly in section, of part of the trimmer; Fig. 5, avertical longitudinal section on line 5 5, Fig. 4; Fig. 6, a horizontal section on line 6 (3, Fig. 5; and Fig. 7, a detail of the cutter.

The letter o represents the bed-plate of my improved trimming attachment, whichis provided with an elongated slot a, so that it may be secured adjustably to the table of a sewing-niachine. Mounted longitudinally upon the bed-plate a in suitable bearings I) b is a rock-shaft b, to the end of which the movable cutting-blade c is secured by screw c. The roclcshaft b is provided with a laterally-extending arm 12, carrying a frictionroller which is received within a socket or opening d of an operating-lever d, turning on fulcrum d? and adapted to be connected at its free end d' by a screw (1 to the needlebar A of the sewingmachine A. Thus it will be seen that the reciprocating motion of the needle-bar will cause an oscillation of the cutting-blade 0.

Co operating with the movable cuttingblade 0 there is a fixed cutting-blade e, which is attached to a bent rod 6 actuated by a spring 6' that tends to draw the fixed cutter against the movable cutter, as will be readily understood.

In order to properly lubricate the cuttingedges of the cutters c e, I employ the following construction: Within a longitudinal groove formed in the lower face of the plate a there is attached by sore ws f an o utwardlyproj ectin g lubricating-arm f, which is placed parallel to the rock-shaft Z2. ithin the arm f there is formed a duct or channel f which communicatcs at one end with an oil-cup f Fig. 5, formed in one piece with the bearing b or otherwise. At the other end the ductf opens into a chamber f", which is inclosed within the arm f and which is filled with a suitable packing material or absorbent. The chamber f opens in turn by small perforations upon a small platform or flattened end f, in which the arm f terminates, and which is located directly beneath the free end of the movable cutter c.

In use the lubricant introduced into cupj" will flow through duct f into the chamber f, where it will be held by the absorbent and gradually delivered upon platform f. This platform will, by the cutting operation, become covered with a fine layer of clippings or threads, which thus constitute a bed that re ceives the lubricant through the openings f and transmits it to the blade 0. Thus it will be seen that the cutting-edge of the blade is continuously supplied with a properly regulated amount of lubricant.

The fixed plate a is attached to its arm 6' in the following manner: lVithin the upper face of arm 6 is formed a groove 6- which is slightly inclined to the transverse axis of the trimming attachment, and thus holds the blade 6 at a slight inclination -to the blade 0 to insure a proper cutting action. The blade 6 is held within its grooved seat by one or more clamp-screws e. The free end of the blade 0 is notched, as at 6, Figs. 3 and 7. This notched end of the blade 0 projects across the platform f of arm f and engages a flange f formed on said arm. In this way the free end of the fixed cutting-blade is properly held in place and the operative portion of such blade is exposed to the action of the lubricant thatflows upon the platform f At the same timethe'blade e isfree tobe pressed by the spring 6 against the blade 0, the flange f constituting in effect a rail upon which the blade e is free to slide in a lateral direction.

It will be seen that in my improved trimmer both blades are properly lubricated, and that they will operate effectively for an indefinite length of time.

What I claim is- 1. The combination in a sewing-machine trimmer of a lubricating-arm having a flattened end to constitute a platform, andan oil-duct exten din g through said arm and openin g upon said platform, with a pair of cutting blades that project above the platform, substantially as specified.

2. The combination in a sewing-machine trimmer, of a lubricating-arm having an oil duct, a perforated chamber, and a platform communicating therewith, with an absorbent within the chamber, and with a pair of cutting-blades projecting above the platform, substantially as specified;

The combination in a sewing-machine :5

platform, with an absorbent Within the chamher, a movable blade projecting above the platform and a notched fixed blade engaging the flange of the platform, substantially as specified.

. CARL G. RUTZ.

\Vitnesses 'F. v. BRIESEN,

WILLIAM SoHULz.

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