Patent GB-1138301-A (GB)
Title: Improvements in or relating to forming seams between portions of sheet material and in or relating to apparatus adapted for use therein
Inventor: WEBSTER PHILIP JAMES
IPC: A43D8/00
Filed: 1964-11-11
Abstract: 1,138,301. Folding edges of and seaming non - metallic sheet material. BRITISH UNITED SHOE MACHINERY CO. Ltd. 10 Feb., 1966 [11 Nov., 1964; 12 June, 1965], Nos. 45890/64 and 24926/65. Heading B5K. Apparatus for use in forming a back seam between edge portions 12, 14, Figs. 1 and 4, accompanying Provisional Specification 24926/65, of a shoe upper U comprises a wiping member 22 with a curved edge 54 complementary to the curvature to be imparted to the back line of the shoe, a work support 6 upon which the quarter 12 can be positioned with a part 26 thereof extending beyond a curved edge 18 of the support 6, means whereby a forming plate 8 with an edge 16 curved complementarily to the edge 54 can be located against the quarter 12 so positioned with the edge 16 adjacent the projecting part 26, means whereby the quarter 14 can be positioned with a curved edge thereof aligned with the edge 16, and means whereby the member 22, in the the operation of the apparatus, wipes the part 26 over the edge 16 and into overlapping relationship with the quarter 14. The block 6 having a support surface 7 is mounted for heightwise movement by a cylinder (52), Fig. 2 (not shown). A clamp plate 10 comprises a curved edge 11 and a support surface 13. The plates 8, 10 are hingedly mounted on the block 6 by a rod 64 extending between lugs 60 thereon and are movable between open positions remote from the surface 7 and closed positions in which the plate 10 overlies the plate 8 which overlies the surface 7. When in the closed position the curved edge 16 of the plate 8 is inclined at a small angle towards the surface 7. A clamping device (20), Fig. 2 (not shown), comprising a spring-loaded pawl 70, is arranged to clamp the block 6 and the plates 8, 10 together in their operative positions. A gauge plate 100 mounted in the block 6 has pins 114, 116 mounted in it to engage location holes 115 in the quarter 12 and a gauge plate 122 mounted in the plate 10 has pins 134, 136 mounted in it to engage location holes 135 in the quarter 14. The member 22 comprises opposed chamfered faces extending around the curved edge 54. A gauge member 23 comprising a curved surface 25 also complementary to the edge 16 is mounted on the member 22. Pneumatic cylinders (52), Fig. 2 (not shown), 38 are operable to cause relative movement between the member 22 and the block 6 in directions perpendicular and parallel, respectively, to the plane of the surface 7. In operation, the quarter 12 is positioned on the pins 114, 116 of the block 6 with its curved edge part 26 extending uniformly past the edge 18, the part 26 being skived on the grain side and pre-coated with cement along the skived surface. The plate 8 is moved to overlie the quarter 12 with the edge 16 thereof overlying the edge 18. The quarter 14 is positioned on the pins 134, 136 of the plate 10 with its grain side uppermost and a curved edge part 30 extending uniformly past the edge 11, the part 30 being skived along its flesh side and precoated with cement along its skived surface. The plate 10 is moved to overlie the quarter 14 so that the part 30 extends along the edge 16 and the pawl (70) clamps the block 6, the plates 8, 10 and the quarters 12, 14 together, Fig. 4. Movement of the plate 10 into its operative position opens a valve (VI), Fig. 2 (not shown), to cause the cylinder (52) to lower the block 6 so that the member 22 wipes the part 26 upwardly past the edge 16, Fig. 5 (not shown). The operator presses a button (not shown) to open a second valve (not shown) to cause the cylinder 38 to move the member 22 forwards horizontally until arrested by stop screws 48 to wipe the upright part 26 around the edge 16 and over the part 30, Fig. 6 (not shown). The member 22 is held in position overlying the part 26 for a desired period while pressure is applied between the member 22 and the block 6 to bond the parts 26, 30 together to form a seam. The quarters 12, 14 are released by applying manual pressure to a part (74) of the pawl (70). In a modification (not shown), the plates 100, 122 are replaced by smooth surfaced plates and the quarters are not provided with the holes 115, 135. In an alternative embodiment, Figs. 1-5 (all not shown) accompanying Provisional Specification 45890/64, the apparatus comprises a bed (24) slidably mounted on a table (26) having a curved projection (28) corresponding to the curved edges of the quarters (2), (14) to be seamed. In operation, a platen (34) of a high frequency press is positioned with its upper surface below the table surface (30). The quarter (2) with its grain surface upwards and having a skived edge (10) is located on pins (32) on the surface (30) so that the edge part (4) thereof, which has previously been coated with neoprene cement, overhangs the projection (28) and extends over the platen (34). A forming member (38) with a curved edge (44) is located on the pins (32) on the quarter (2) so that the edge (44) overlies the projection (28). The quarter (14) having a skived surface (22) previously coated with neoprene cement is positioned with its grain side contacting the member (38) and its curved edge part (16) level with the edge (44). The platen (34) moves upwards to wipe the part (4) upwardly, Fig. 2. The table (26) is slid on the bed (24) to wipe the part (4) down on to the part (16) so that the cement coatings contact each other, Fig. 3. A high frequency field is applied from the platen (34) to heat the cement and bond the quarters (2), (14) together.