US529783A - Trimming attachment for sewing-machines - Google Patents

Description

(No Model.) 2 Sheets-'Sheet 1.

W.V G. GUMMINS Sn/E. A. MUNR'O. TRIMMING ATTACHMENT PoR SEWING MACHINES.

Y No. 529,783. n Patented Nov. 27, 1894.

(No Model.) l I s 2Sheets-Sheet 2.v v

W. G. GUMMINS& E. A. MUNRO; TBIMMING ATTAcHMENT F011 SEWING MACHINES.

No. 529,783. PatentediNov. 27, 1894.

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it appertains tomake anduse the same, ref- 3S ,3' are detail views of the cutter. Figs. 4 and 1 UNITED STATES 1 vWILLIAitrr-a. cUMMiNs :'AND EMMA A. Murad-0E MCMINNVILLE, TENNESSEE.

PATENT OFFICE.

.' TulMMiN-c `'rrfrAcHo/iENT Fou sEwlNG-MAcH|NEs.

SPECIFICATION forming pere ef Lettere Patent-No- 529,783, aerea November 27, 1 894.

j l Applicatien filed January 29, 1894. y Serial No'. 498.38@ (No model.)

To all tch/'om `it may concern:

rBe it known that we, WILLIAM G. CUMMINS and EMMA A. MUNRO, citizens of the United States, residing at McMinnville, in the county of Warren and State of Tennessee, have invented certain new and useful Improvements "1 in Servingelldachine Attachments; and we do hereby declare the following to be a full, clear,

"and exact'desc'riptionof the invention, such as will enableothers skilled inrth'e art to which erencebeing had to the accompanyingdrawings, and to the letters of reference marked i thereon,`which form a part of this specifica- IS v tion. l Oui-invention relates tofan improved attachinent for sewing machines; and the main obgect of `the invention is to provide an attachment which can be'easily applied to any fmachine and bywhich the edges of material Sewed by the machine will' be trimmed in such a manner/'as to prevent raveling thereof.

iAnother-objectzojthe invention is toprovide an attachment by which the edges of the material on which thegmachine is vworking will be given an ornamental appearance.

Our invention consists in the peculiar construction and arrangement of parts as will be hereinafterjmore V'rullypointed out and claimed.

j In' the accompanying drawings:-Figure l isi aA perspective view of afportion of a sewing l, machine providedwith our improved attachment. Fig. 2 is an elevation of theattachment removed from the machine. Figs. 3 and 5 areelevations showing a slightly modilied construction. Fig. 6 is a detail view illusvjtrating another modification. 'Figi 7 is a detail view `illustrating a modification' of the manner-of connecting the.I cutter bar and cutter. 'f Y l Like letters of reference denote correspond` ing parts in'all of' thegures of .'thedrawings, 4S l. A designates the bed plate, and A" therereferring to which--l ciprocating' needle barof la sewing'machine, i

form and size and said plate is adapted to be rigidly attached to the bed plate, A, of the machine by a thumb screw, B', or other means which will permit of its ready removal at any time.

Two posts or standards, C, C', are rigidly attached to the base plate, B, orformed integral therewith, the post, C', being situated to one side ofand in rear'of the post, C. The post or standard, C', serves as-a fulcrum block for a main operating lever, D, which is connected to said-post by a pivot pin, d. In the lever, D, near the forward end thereof is formed a slot, E, adapted to receive a laterally projecting stud or pin, E', on the needle bar, A', and near its other end said lever, D, is bent toward the post or-standard C', so as to extend substantially at right angles to the 'length ofthe main body of the lever, the outer end of such bent portion being reduced to form a pin, F, which extends through a slot, f, formed near the rear end of a pivoted or rocking cutter bar, G.

The cutter bar, G, is fulcrumed on the post or standard, C, and is connected with the main ,operating lever, D, in the manner described above. The forward end of the cutter bar extends through a guide piece G, which is shown as consisting -simply of an upright provided with a central vertical slot which opens through the upper end of the standard and is:

of sucha width as to permit the cutter barto move freely therein. To the forward end of the bar, G, is connected the upper cutter of ourattachment. ThiscutterJL'maybe made in the form shown in Figs. 3 and 3' in which the stock or body thereof is bifureated to extend on opposite sides of the cutter bar to which'it is suitably connected while the lower cutting portion is made V shaped in cross section the apex or point of connection of the two inclined sides being toward the needle of the machine.

In a suitable block, I, attached to the upper surface ofy the base, B, of our attachment, in front of the guide, G', is formed a vV shaped aperture, K, adapted to receive the cutter, H, and said opening -aliglns with a similar opening inthe plate, B. The operation of our invention may bev brieiiy stated as followsz-l-The reciprocation yof the needle'bar, A', causes the lever, D, to

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rock on its pivot and a similar movement is communicated to the cutter, H, through the cutter bar, G. Thus as the material to be sewed by the machine is fed beneath the needle the edge or edges of the seam are regularly notched by the cutter, H, and prevented from raveling. The guide, G', besides serving as aguide to the cutter bar also serves as a guide tor material being sewed and insures the seam or line of stitching being parallel with the edges of the material.

In Figs. 4 and 5 of the drawings we have illustrated a modified form of our invention showing the same adapted to be operated from the needle bar of a machine when it is not practical to provide such bar with a pin or stud as shown in Fig. 1. In this construction the lever, D, and cutter bar are connected in the manner hereinbefore described; but instead of forming a slot in the lever, D, to receive a pin or stud on the'needle bar we provide such lever with a laterally project-v ing fork shaped piece, L, which is adapted to extend on opposite sides of the needle bar j ust below the needle clamp or holder thereon..

The fork, L, is preferably connected to the lever, D, by a swivel joint. -To the base, B, in rear of the cutter bar guide we attach one end of a fiat or leaf spring, M, the other end of which spring bears against the under side of the cutter bar, G, and operates to return said bar and its attached cutter as well as the forward end of the lever, D, to its normal elevated position as the needle bar moves upwardly. Y

In Fig. 6 we have illustrated a slight moditication of the cutting mechanism. 'In this construction the upper cutter is made in substantially the form before described except.

thatit is reversely arranged; that is the apex of the angular cutting portionthereof is acl-` jacent to the cutter bar guide instead of toward the needle. The lower cutter, however, in this construction consists of a raised portion, N, adapted to fit within the lower end of the upper cutter as the same is forced down against the base',, and the upper surface of such raised portion, N, is partially removed to provide 't`wo cutting edges. rIn this construction the pieces cut from the material, being sewed, by the cutting mechanism will fall upon the base, B, instead of passing through an opening therein.

Instead of connecting the upper cutter rigfore described and illustrated, said cutter may be fitted snugly within a guide sleeve or tachahly connected with the cutter bar by a pin, O, extending through a slot, P, formed in said bar. This construction enables the cutter to be easily detached from the cutter bar for the purpose of being sharpened or replaced by a new cutter. It will thus be seen that we have provided a very simple attachment which can be easily applied to any machine and which `will prevent the edges of seams from ravelingwhile at the same time giving them an ornamental appearance.

y Having thus described our invention, what `we claim as new, and desire to secure by Letters Patent, is

n attachment for sewing machines comprising a base,a cutter block attached thereto, a cutter 'bar fulcrumed on said base and a lever fulcrumed to said base and extending parallel to said cutter bar and connected thereto at its extremity by a pin and slot connection, the other extremity of said lever being suitably connected with the needle bar so the cutter bar, substantially as described.

In testimony whereof we affix oursignatures in presence of two witnesses.

WILLIAM G. CUMMINS. EMMA A. MUNRO.

Witnesses: Y

WILL THURMAN,

J As. MUNRO.

idly with the rocking cutter bar as hereinbeadapted to'cooperate with said cutter block,l

box carried by the standard, G', and be deas to be operated thereby and'l thus operate

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