Патент USA US2108178код для вставки
Feb. 15, 1938. s. E. ROSENBERG 2,108,178 APPARATUS FOR TRIMMING OR PINKING LEATHER OR THE LIKE. Filed Feb. 24,. 1936' m", I‘ ‘ - 2 Sheets-Shee't 1 m /']izwW ~ W» Féb. 15, 1938. ‘ s. E. ROSENBERG 2,108,178 APPARATUS FOR TRIMMING OR PINKING LEATHER OR THE LIKE Filed Feb. 24, _l956 / 4W a. 0 ( a 2 Sheets-5311691 2 2,108,178 Patented Feb. 15, 1938 UNITED’ STATES PATENT 'oFFicE. 2,108,178 APPARATUS FOR TRIMIVH‘NG OR PINKING - LEATHER OR THE‘ LIKE‘ Stig E. Rosenberg, Brockton, Mass. Application February 24, 1936, Serial No. 65,200 4 Claims. (Cl. Mil-23} This invention relates to a method of and apparatus for trimming marginal portions of a piece of leather or the like, the trimming or pinking cuts being such as to leave a beveled UK edge. It is an object of the invention to provide apparatus for cutting a non-straight marginal portion of a piece of leather, such as a part for a shoe upper, so that the entire portion to be 10 trimmed is operated upon with one stroke only. It is another object of the invention to provide apparatus by which a non-straight marginal portion of a piece of leather may be pinked on a bevel in such a manner that each of the scal 1 Mounted at suitable points on the base block 20 are gage pins 28. The pinking cutter 30 is in 10' the form of a knife having a sharp cutting edge following the con?guration of the bevel edge 23 of the supporting plate 22, the knife as shown being integral with a horizontal back 3| which 15 rigidly maintains the blade 30 in its shape. As indicated in Figures 2 and 3, the pinking point. knife 30 has a blade of uniform width (or height) and of substantial thickness sufficient for the formation of a zigzag cutting edge by V notches or grooves in the side faces of the blade, the sur face de?ned by the cutting edge having a sub drawings of which Figure 1 is a plan view of apparatus embody ing the invention, designed for pinking a shoe 25 vamp. Figure 2 is a side elevation of the same, a portion being broken away to show in section. Figure 3 is a section on the line 3—3 of Fig ure 1, this view being. on a larger scale. Figure 4 is a fragmentary portion of Figure 3 showing the parts in a different position of op eration. Figure 5 is similar to Figure 4, showing a fur ther step in the operation of the apparatus. 35 pinked. As illustrated in Figure 1, the vamp 25 is of the well known wing-tip shape, the upper or inner edge of which is to be pinked prior to being sewed to other portions of the upper. lops along the edge projects in a direction per pendicular to the direction of the edge at that Various other advantageous features of the in. vention will be apparent to one skilled in the art from a disclosure thereof in the description of certain embodiments which follows, and on the 30 portion 23 which is shaped to conform to the contour of the portion of the work which is to be trimmed or pinked. By way of example, a shoe vamp 25 is shown as the work which is to be Figure 6 is similar to Figure 4 except that a backing sheet is shown in addition. Figure 7 is a fragmentary perspective view of a marginal portion of a piece of leather or simi lar sheet material after being operated upon ac 40 cording to the invention. Figure 8 is a fragmentary sectional view of apparatus for bevel-trimming leather or the like. Figure 9 is a perspective view of a shoe vamp having edge portions thereof bevel-trimmed. stantially uniform bevel and being complemental to the surface 23 of the work-supporting table 22. As indicated in Figures 3 to 6, the knife 30 has a beveled cutting edge 32 conforming to the 26 bevel of the plate edge 23, so that, when the knife descends in a cutting operation, the entire cut ting edge simultaneously engages the bevel edge 23 of the supporting plate. As shown, the knife may be secured to the under face of a suitable plate 34 which in turn is mounted on a plural ity of pillars 36, the pillars extending into suit able cavities 38 in the block 28 and being pressed upwardly by springs 41? in the cavities 38, as in dicated in Figure 2. The plate 34 and the knife back 3! are provided with suitable apertures 42 and 43 respectively, above the gage pins 28 so as to permit the operator to see the pins and the marginal portions of the work immediately in contact therewith before the knife descends. The 40 operation of the pinking mechanism is indicated in Figures 4 and 5. In using the apparatus, the operator places a vamp or other piece of work on the supporting plate 22 and pushes it until ' Figure 10 is a fragmentary View of apparatus for bevel-trimming a piece of leather. Figure 11 is a fragmentary perspective view of a piece-of leather having an edge portion it engages the several gage pins 28, sighting the 45 gage pins through the apertures 42 and 43 to see that all are engaged by the work. Since the trimmed on a bevel. of the vamp to be pinked, this marginal portion Referring to the drawings in detail, a die suitable for carrying out the invention is illus trated in Figures 1 and 2. As illustrated, this in Figure 3. die may consist of a base block 20 on which is mounted a stationary supporting plate or table 22, the supporting plate having a beveled edge bevel edge 23 conforms to the marginal portion overhangs the bevel edge 23 as indicated at 46 50 The plate 34 with the knife V3!‘! is then caused to descend by any suitable means so that the knife 30 engages the overhanging por tion 4.6 of the work. This overhanging portion is thus pushed ‘down out of the plane of the 55 2 2,108,178 work, as indicated in Figure 4, so that all por tions of the marginal part to be pinked are at an angle to the plane of the work. Further descent of the knife 30 causes the cutting edge to penetrate through the bent marginal portion 46, as indicated in Figure 5. It is evident from this ?gure that the knife 30 cuts the leather at an acute angle to the surface thereof, thus making a bevel cut. In pinking a marginal por portion of the leather at a relatively small angle with the face of the leather, such a out being somewhat similar to a skiving cut, as indicated at 16 in Figure 11. It is evident that various modi?cations and changes may be made in the invention as herein shown and described without departing from the spirit or scope thereof as de?ned in the following claims. 10 tion of a vamp‘ or other part of a shoe upper, it is desirable that each of the scallops or ser 10 1. A pinking die comprising a horizontal sup~ rations along the edge project in a direction porting table for a piece of leather, said table perpendicular to the edge of the leather at that point, that is, in the direction of the radius of 15 curvature of the edge at such point. To this end the pinking knife 36 may be constructed as having a beveled edge portion similar in contour to the edge portion of the leather to be trimmed, gage pins engageable by said edge portion of the leather, means supporting said gage pins adja cent to said beveled edge portion of said table, a knife-supporting plate yieldingly mounted over said table, a knife mounted on the under side of said plate, and means guiding said plate so that downward movement thereof brings said knife into contact with said beveled edge of the table, indicated in Figure 1 so that the scallops, serra tions, or other individual projections along the edge will extend in the proper directions, as 20 indicated in Figure '7, wherein are shown a series of serrations 158 arranged along a curved edge, each of the serrations extending in the direction of the radius of curvature of the edge at that point. r said plate having apertures therethrough above said gage pins to permit sighting of said pins The supporting plate 22 is preferably of some , and the portions of the work adjacent thereto. 2. A die for bevel-trimming or pinking leather relatively soft metal such as brass or aluminum, so that, if the knife 30 cuts into the face of the bevel edge 23 slightly, the cutting edge of the knife will not be injured. In some cases, it may 39,, be desirable to provide a backing layer to overlie the supporting plate 22 and to receive the cutting edge of the knife after it has penetrated through the marginal portion 46 of the leather or other piece of material to be trimmed or pinked. Such 35 a backing layer is indicated at 50 in Figure 6. It may be made of any suitable material such as a ?brous sheet having sufficient elasticity to give properly without cracking or buckling along the marginal portion when the margin is bent down or the like, comprising a base, a wor —supporti_ng table secured on said base, said table having a beveled edge portion, a knife-supporting plate mounted above and resiliently supported by said base, and a knife secured to and projecting down from said supporting plate, the cutting edge of the knife having a shape corresponding to the shape of said beveled edge portion of said table. 3. A die for bevel-trimming or pinking leather or the like, comprising a base, a work-supporting table secured on said base, said table having a beveled edge portion, a plurality of gage pins mounted on said base adjacent to said beveled as indicated at 52. Figure 9 illustrates a shoe vamp 55 having an edge portion 56 cut on a bevel. As shown, this shoe vamp may also have decorative perfora edge portion, a knife-supporting plate mounted above and resiliently supported by said base, said tions 58 with beveled edges, the perforations hav projecting down from said supporting plate, the 45 ing preferably been previously punched as at 68 before the edges thereof are trimmed. The bev eled edges may be cut by means of a die similar to that illustrated in Figures 1 and 2 except that the knife 62 has a shape suitable for the desired bevel out instead of being provided with scallops or a zig-zag edge as shown in Figure 1. Figure 10 illustrates a support plate 10 having a relatively steep beveled edge 12. A knife 14 is mounted in the manner indicated in Figures 1 in U! and 2 so as to push the marginal portion 46 of a piece of leather out of the plane of the piece and against the bevel surface 12. The knife then descends to make a bevel cut on the marginal plate being provided with sighting apertures above said gage pins, and a knife secured to and cutting edge of said knife having a shape corre sponding to the shape of said beveled edge por tion of said table. 4. A pinking knife for bevel-pinking shoe upper parts, said knife comprising a blade of uniform width and substantial thickness shaped to corre spond to the edge of the work to be pinked, the upper and lower edges of said blade being dis posed respectively in parallel horizontal planes when the knife is in use, said lower edge being formed with a zigzag cutting edge de?ning a ; bevel surface at a constant angle to the vertical throughout the length of the knife. STIG E. ROSENBERG.