Патент USA US2116680код для вставки
May 10, 1938. H. A. HAWKES ' 2,116,680 ROUNDING MACHINE AND KNIFE THEREFOR Filed July 1, 1936 ' Q Patented May 10, 1938 2,116,580 UNEED STATES PATENT QFFICE a‘ 2,116,680 ROUNDING MACHINE AND KNIFE THERE ' FOR Harry A. Hawkes, Chelsea, Mass, assignor to United Shoe Machinery Corporation, Pater son, N. J., a. corporation of New Jersey Application July 1, 1936, Serial No. 88,427 5 Claims. (Cl. 12——25) Fig. 1 illustrates a particular form of the knife of this invention, while Fig. 2 shows the knife in place in the rounding is rounded or cut by a knife to correspond to the , machine. contour of a pattern. In the Planet rounding machine, the relative In sole-rounding apparatus, of which the well cutting movement between a knife l0 and a known Planet machine disclosed in Letters Pat ent of the United States No. 882,009, Mayo, pattern 62, upon which a sheet of stock S is March 17, 1908, furnishes an example, relative held by a clamp H, is effected by the travel of This invention relates to machines by which sheet-material, such as stock for insoles of shoes, movement produced between a knife and sheet 10 material held against a pattern causes work pieces to be formed by the knife under the guid ance of the pattern. As the machine is con structed, it is entirely effective in its operation upon even thin stock when this is ?rm in char 15 acter. But when it is soft and ?accid, as is cer the knife, the pattern and clamp being stationary during the rounding operation. This travel is '10 imparted to the knife from a rotary table it‘, upon which is mounted for oscillation and bodily movement a carrier-arm 18 having on its inner extremity adjacent to the periphery of the pat tern a holder 20. In this holder the shank 22 of 15 tain insole-material, it tends to be displaced by the knife H] is secured with the cutting edge 24 the action of the knife and to Wave or chatter. in a substantially vertical position, the shank portion of its ?at inner side 26 being guided in its travel by contact with the periphery of the pattern. The blade of the knife is provided with 20 a projection extending from it above the pattern. The projection is preferably furnished by a block 28 having extending between its lower face 36 This results in an objectionably rough, irregular edge upon the cut piece. An object of the present invention is to obtain 20 a cutting action which will give a smooth edge, even with thin, cheap stock. In the attainment of this object, a knife is employed which has a blade provided with an integral shank arranged 25 to be secured in the holder of a rounding ma chine and a cutting edge extending from the shank to the opposite extremity of the blade, where it is provided with a projection entirely surrounding it and arranged for engagement with 30 the margin of the sheet-material being operated upon. With the knife in the machine, the mar gin-engaging surface of the projection extends along the work-contacting surface of the pattern and towardthe clamp by which the work-sheet is 35 held against said pattern. The projection bear ing upon the work inside the cutting edge of the knife holds it ?rmly against displacement and insures a clean cut. Since it is desirable to ob tain substantially uniform pressure of the pro 40 jection against the work when the sheet differs in thickness, said projection is preferably in the form of a separate piece or block surrounding the blade and which has means for securing it in different positions along said blade. In the rounding machine, there is thus altered the rela tion of the work-engaging surface carried by the blade to the pattern and therefore to the material upon the pattern. To provide for the smooth movement of the block upon the work and the 50 easy de?ection of the chip cut by the knife, por tions of the work-engaging surface and other portions of the block at the side toward the work 4 are inclined or relieved. 55 . m In the accompanying drawing, and upper face 32 a passage 34 to receive the knife-blade. The contour of this passage in a 25 horizontal plane may generally correspond to that of the blade, and the block is shown as se cured variably in position upon the blade- by sct~screws 36. The surface 30 extends laterally from the blade above and substantially parallel 30 to the upper face of the pattern, and conse quently to the sheet S clalnped thereon, toward the clamp l4. There is also preferably an ex tension of the surface over the sheet and pattern along the line of the cut forwardly and rearward- 35 ly from the edge 24 and at the outer side of the blade opposite the surface 26. For a particular thickness of stock to be operated upon, the block 28 is adjust-able vertically upon the blade and secured thereon by the set-screws 36. The surface 30 bears upon the upper face of the sheet, holding it positively against upward displacement from the pattern as the knife passes through it. Moreover, the forward and rearward extension 40 ' of the surface 38 has an ironing effect upon the 45 upper face of the work, tending to free it from irregularities, either present in the stock or which might be produced in cutting. As a result of this, the edge and margin of the cut piece, even with relatively soft, sleazy material, is left uniformly 50 even and smooth. The work-engaging portion of the surface 30 in advance of the edge 24 of the blade is shown as curved or inclined upwardly at 38 from the plane of the work. This furnishes a throat by which the upper surface of the work- 55 2 2,116,680 sheet is received during the travel of the knife and is prevented from catching. The outer edge of the surface at 40 is similarly curved or in clined to provide clearance for the chip which is cut, as this curves outwardly and upwardly. Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: 1. In a knife for use in rounding machines, 10 a blade integral with a shank arranged to be se cured in the. holder of the machine, said blade being provided with a cutting edge extending from the shank to the opposite extremity of the knife, a gage-block surrounding the blade and 15 variable in position longitudinally thereof, and means carried by the block for securing it to the blade. 2. In a knife for rounding machines, a cutting blade, and a block secured to and supported 20 wholly by the blade and provided at the side to ward the work with a surface surrounding the blade, said surface being inclined in advance of the cutting edge and at the side of the blade opposite the work outwardly from the plane of 25 said work. 3. In a rounding machine, a pattern furnish ing a support for a work-piece, a clamp movable toward and from the pattern for securing the work-piece thereon, there being a portion of the 30 work-piece extending over the pattern beyond the periphery of the clamp, a holder movable about the pattern, and a knife secured in the holder and extending above the pattern, said knife being provided with a projection extending over the pattern and toward the clamp and hav ing a surface for engagement with the outer 5 portion of the free margin of the work-piece which is substantially parallel to the upper face of the pattern and contacting with the outer portion of the free margin of the work-piece. 4. In a rounding machine, a pattern furnishing 10 a support for a work-piece, a clamp movable to ward and from the pattern for securing the work piece thereon, there being a portion of the work piece extending over the pattern beyond the pe riphery of the clamp, a holder movable about 15 the pattern, a knife secured in the holder and extending above the pattern, said knife being provided with a projection extending over the pattern toward the clamp and contacting with the outer portion of the free margin of the work 20 piece, and means arranged to vary the position of the projection upon the knife. . 5. In a rounding machine, a pattern and a clamp between which the work is held, a carrier and a knife mounted therein and movable about 25 the pattern, a block surrounding the knife and provided with a work-engaging surface, and means arranged to secure the block in different positions upon the knife toward and from the pattern. 30 HARRY A. HAWKES.