US1400530A - Strip-folder for sewing-machines - Google Patents

Description

I A. H. DE VOE. STRIP FOLDER FOR sEwmamAcmmzsb APPLICATION FILED SEPT. 11, 1919.

1,400,530,- Patented Dem-20, 1921.

INVENTOR WITN SES:

UNITED STATES PATENT OFFICE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

STRIE-FOLIDER FOR SEWING-MACHINES.

Specification of Letters Patent. Patented Dec. 20, 1921.

Application filed September 11, 1919. Serial No. 323,162.

To all whom it may concern.

Be it known that I, .ALBERT H. DE Von, a citizen. of the United States, residing at V festfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Strip-Folders for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to strip-folders for sewing machines and has for an object to provide a unitary structure, extending in the direction of the feed of the fabric, capable of successively folding a strip of fabric a plurality of times and to properly control the strip beti 'een the folding operations.

A further object of the invention is to provide a folder adapted to first fold a strip of fabric substantially centrally thereof to form a double strip, and later fold over the marginal portion consisting of the two raw edges, and still later fold the other marginal portion over and down upon the previously folded marginal portion thereby overlapping the marginal portions and covering the raw-edges of the strip.

According to the present invention the folder is constructed with three independently acting folding portions viz., a primary body folding portion, and secondary and tertiary margin folding portions, the delivery end of the primary folding portion merging into and forming the receiving end of the two margin-folding portions.

The invention is illustrated in the accompanying drawings in which Figure 1 is a perspective view of the folder as attached to the clotlnplate of a sewing machine. Fig. 2 is a plan view of the same showing a strip of fabric inserted therein. Figs. 3, 4 and 5 are enlarged transverse sectional views on the lines 3-3, 4-4 and 55, respectively, of Fig. 2 and Fig. 6 is a perspective view of a strip of fabric folded by an attachment embodying the present invention.

Referring more particularly to the drawings, the folder is constructed with a shank 1, adapted to be secured to the cloth-plate 2 of a sewing machine, and has a primary folding portion or scroll 3 adapted to receive the fabric 8 with a face thereof extending in substantially vertical plane and to fold the fabric centrally thereof to form the doubled strip 0? extending in a substantially horizontal plane. This primary; folding por 7 and turns the right marginal portion r of the doubled strip (Z overupon the central portion 0. The scroll 7 which has its delivcry end overlapping the delivery end of the scroll 6 folds the left marginal portion Z over upon the portion 7' thereby covering the raw edges ee of the strip 8.

The folder is formed intermediate the scrolls 6 and 7 with a tension spring 8 adapted to bear against the strip and slightly tension the same. a

The spring Sis provided with an aperture 9 to facilitate threading of the strip through the folder. g

' The stripis drawn through the folder by theaction of the feeding element 10 acting in conjunction with the presser-foot l1, and is stitched by suitable stitching mechanism of which the needles 12 only are shown. 7

It will be observed that the strip .9 is passed through a single folder comprising plurality of folding portions and that by merging the delivery end of the primary strip-folding portion into the receiving end of the edge-folding portions the strip is under constant control during its entire passage through the folder.

It is obvious that various changes may be made in the construction, proportions, sizes, (520., of the different parts of the folder, and that provision may be readily made for turning in both edges of the doubled strip more or less than is illustrated in the draw ings or only one of the overlying marginal portions without departing from the spirit of the invention. Y

Having thus set forth the nature of the in vention, what I claim herein is- 1. In a strip folder, in combination, means for doubling a strip substantially centrally thereof, and independently acting means for folding the marginal portions of the doubled strip.

2. A strip-folder including a folding portion adapted to double a strip passed there through. and an independently acting folding portion adapted to fold one marginal portion of the doubled strip, sald folding portions being so constructed and arranged that the delivery end of the first-named folding portion merges into and forms the receiving end of the last-named folding portion. r V

8. A strip-folder comprising a primary folding portion adapted to double a strip passed therethrough, and independently and l. A strip-folder comprising a unitary structure extending in a single direction and having a folding portion adapted to. double a strip passed therethrough, and independently acting folding scrolls for turning in the marginal portions of the doubled strip.

5 A strip-folder comprising a primary folding portion adapted to double a strip substantially centrally thereof, and secondary and tertiary folding portions, forming continuations of the primary folding portion, each adapted to fold over one of the marginal portions of the doubled strip,lsaid folding portions being so constructed and arranged as to successively double the strip,- to fold over the marginal portion of the doubled strip comprising the tWoraW edges and to fold over theinarginalportioncomprisingthe folded edge, the delivery end of the tertiary'folding portion overlappingthe delivery end of. the secondary foldingportion whereby the marginal portions of the strip are folded into overlapping relationship with the edges concealed.

6. A strip-folder comprlsing'a prlmary "strip-folding portion adapted to double a strip passed therethrougln'a plurality of'independently acting folding portions adapted to receive the doubled strip from the primary folding portion and fold the margins thereof, and a'strip-tensioning spring lo cated intermediate the margin-folding portions.

7. A strip-folder comprising a primary folding portion'adapted to fold a strip in one direction, a secondary foldingportion adapted to fold. one margin of the folded strip in'a direction opposite to the primary folding portion and a tertiary folding portionadapted to fold the other margin of the folded strip in a direction corresponding to the direction of the primary folding portion.

In a strip-folder, in combination, means for doubling strip, and independ-' ently acting means for folding the marginal portions of the doubled strip into overlap" ping relationship.

9. A strip-folder comprising a portion] adapted to receive a strip led thereto substantially in a vertical plane, means for folding the strip substantially centrally thereof and means for delivering the folded strip horizontally to independently acting folding scrolls adapted to fold the marginal portions of the folded strip in opposite directions into overlapping relationship In testimony whereof, I have signed my name to this specification.

ALBERT DE Von.

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