US1179119A - Method of cutting sheets or shoulders of sole-leather into strips for welting. - Google Patents

Description

v H. LYON. METHOD OF CUTTING SHEETS 0R SHOULDERS 0F SOLE LEATHER INTO STRIPS FOR WELTING.

APPLICATION man OCT/I3, ms.

1,179,]. 19. Patented Apr. 11, 1916.

, N \/E NTU H/ARRy LymN "WWW ATT R 5Y5 1 usually called shoulders.

' the leather.

HARRY LYON, 0E ERooKToN, MASSACHUSETTS," ASSI'GNOR To JOHN 'A."'EAR B0UR AND PERLEY E. BARIBOUR, BOTH or BROCKTON, MASSACHUSETTS, DOING BUSINESS AS COPARTNERS UNDER THE NAME or BRocKToN RAND COMPANY.

METHOD OF oUTTING SHEETS 0R SHoULnERS 0E SOLE-LEATHER INTO STRIPS 30R WELTING.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed October 13, 1915. Serial No. 55,637.

To all whom it may concern:

Be it known that I, HARRY LYON, a citizen of the United States, residing at Brockton, in the county of Plymouth and State of Massachusetts, have invented new and use ful Improvements in Methods of Cutting Sheets or Shoulders of Sole-Leather into Strips for Welting, of which the following is a specification.

This invention relates to the manufacture of welting for boots and Shoes, from the.

irregularly shaped sheets of sole leather A shoulder of tanned sole leather has one relatively long edge presenting an irregular re'ntrant curve. It has been customary heretofore to subdivide a shoulder into strips or blanks, eachwide enough for several welts, by curved cuts, the first cut following as closely as possible the re'ntrant curvature of the longer edge, and the succeeding cuts being as nearly parallel with the first cut as is ossible, each blank being subsequently subdivided into welt strips of operative width. This method of subdividing welt strips involves a considerable Waste of leather, and other objections, as more fully described hereinafter.

My invention has for its object to obviate the objections to the said prior method, and it consists in the improvements which Twill now proceed to describe and claim.

In the accompanying drawings forming a part of this specification, the figure represents a side view of a sheet or Shoulder of sole leather, and illustrates my improved tice to subdivide the shoulder into blanks by first making a curved out following the edge as closely as possible, and then making a series of curved cuts substantially parallel with the first out, each cut extending through theentire lengthand thickness of These cuts have been necessarily made by a hand-operated knife making the cut progressively. The depth of the curve of the edge I) varies to such an extent in different shoulders that it is impossible to form a curved out which is exactly parallel with and at an exactly predetermined distance from the next cut. For this reason, it is not possible to subdivide a shoulder by curved cuts, into Strips each of the width required for an operative welt, without more or less waste of material in the shape of narrow Waste strips or trimmings at one' edge of the strip, and it has therefore been necessary heretofore to make each strip or blank of a width sufficient for several Welts, usually four or more, and to subsequently subdivide the blank into welt strips, the operation being attended with more or less Waste of material.

It is important that the ends of a welt strip be accurately formed at right angles with its longitudinal edges in order that blanks, and in cutting away imperfect portions such as are due to Slaughter cuts in the leather. Further waste of leather is due to the fact that the blanks have to be cut Wider than the aggregate width of the Welt strips into whichthey are subdivided, so that in forming the welt strips narrow waste strips or strings are produced. Moreover, the

shrinkage-of a relatively wide strip or blank is often such that the predetermiiied number of full width welt strips cannot be produced from a blank, at least one of the welt strips having to be of reduced width.

To...overcome" the objections above recited, I-cut ashoulder as indicated in the drawing, my preferred mode of prpcedure being as follows: I first remove the marginal portion having the edge I) by a straight out 10 10,

thus forming a straight base edge on the strip, said edge being approximately paral:

lel with a portion of the edge 6. After removing-the marginal portion 11 separated from the shoulder by the cut 10 10, I proceed to subdivide the body of the shoulder by a series of straight cuts 12 12 into relatively narrow straight edged strips 13, each of which may be of the width required for an operative welt strip, although I prefer to make each strip 13 of a width which is a multiple of the width of a single welt strip and. subsequently subdivide it into a plurality of welt strips of operative width and without waste of material by a straight out or cuts l4 11, as indicated by dotted lines, Each straight out 10-10 may be conveniently formed by an elongated knife forming the entire cut at one operation, and each out forms a base edge which is a factor in the determination of the direction of the out next formed, said edge being adapted to cooperate with suitable gaging means, so that the successive base edges may be accurately formed, each at an exactly predetermined distance from the next. The removed portion 11 may be similarly subdivided, as indicated. The straight edged welt strips thus produced are adapted to be joined together or spliced without forming projections, shoulders or slight angles at the joints. All waste in the form of edge trimmings or strings is eliminated as above described. The waste of material involved by the improved method of cutting is further reduced, as will be apparent from a comparison of the shaded portions in Fig. 2 with those in Fig. 1, the reduction of waste being noticeable not only at the marginal portions of the shoulder but also in the vicinity of a slaughter cut 7', back wrinkles g, or other imperfections in the body of the shoulder.

When the strips 13 are of only double the width of a single welt strip, the shrinkage of the strips 13 does not noticeably affect the width of the ultimate welt strips.

Having described my invention, I claim:

1. The improvement in the method of cutting into welting a shoulder of sole leather presenting an irregular reentrant curve at one edge, which consists in severing said shoulder on astraight line approximately parallel with the major portion of said curve, and completing the cutting by severing portions on opposite sides of the initial cut into a series of welt strips.

2. An improvement in the method of cutting into welting a shoulder of sole leather presenting an irregular reentrant curve at one edge, which consists in severing said shoulder on a straight line adjacent the major portion of the reentrant curve, and completing the cutting by severing portions on opposite sides of the initial cut into a series of welt strips.

3. An improvement in the method of cutting into welting a shoulder of sole leather presenting an irregular reentrant curve at one edge, which consists in severing said shoulder on a straight line approximately parallel with the major portion of said curve, and completing the cutting by severing portions on opposite sides of the initial cut into a series of welt strips, said cuts being spaced to form relatively wide strips the width of which is a multiple of the width of an operative welt strip, and then subdividing said wide strips into operative welt strips.

In testimony whereof I have affixed my signature.

HARRY LYON.

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