| 摘要 |
1,202,550. Folding edges of and seaming non-metallic sheet material. UNION SPECIAL MACHINE CO. 22 Dec., 1967 [27 Dec., 1966], No. 58397/67. Addition to 1,154,382. Heading B5K. [Also in Divisions B2 and D1] The edges 280 to 283 of a fabric pocket blank 279 are folded over and impregnated with a heated and molten organic compounds such as para-dichlorbenzene, which on cooling in situ in the fabric serves to stiffen and to bond together the two plies constituting the folded edges. After work, such as sewing, has been performed on the stiffened edges, the stiffening agent is removed by heating. In the apparatus shown, an outer container 30d, lined with insulation containing a heating coil 46d, supports an inner container 37d for molten stiffening agent 38d maintained at a temperature slightly above its melting-point by a thermostat 40d. Container 30d is closed by a plate 166 formed with a cut-out 173 conforming in shape to but slightly larger than blank 279. Container 37d is closed by a plate 51d formed with a U-shaped slot-like cut-out 53d conforming to the edges 280 to 283, slots 133d extending outwardly from cut-out 53d to define resilient tongues 134d, and a slot 175 defining resilient tongues 176, 177 within the arms of the cut-out 53d. Plates 201 to 204, slidably mounted on plate 166 by pin-and-slot connections 207, 209, have respective inner bevelled edges 206 conforming to the sides 283, 282, 281, 280, respectively. Plates 201 to 204 are biased inwardly by respective springs 220. A rigid and porous applicator 70d, partially immersed in agent 38d, is formed from sintered brass and is supported by the base of container 37d and comprises vertical walls, the exposed upper edge surface 74d of which is located below and in alignment with the cut-out slot 53d. Plate 166 carries brackets 272, 273 journalling a rod 269 which is rigid with an arm 97d biased to the raised position by springs 274, 275. A body 245, slidable in a slot 247 formed longitudinally in arm 97d, is biased to the inner end of slot 247 by a spring 260, and is pivoted by a pin 242 to lugs 240 upstanding from a plate 98d having bevelled edges 228 conforming to the edges 280 to 283. In operation, a blank 279 is laid upon plate 51d within the edges 206, and arm 97d is lowered. The edges 228 thereby cooperate with the edges 206 to move the plates 201 to 204 outwardly, blank 279 is pressed against surface 74d, kept wet by capillary action, by plate 98d, and the plates 201 to 204 move inwardly to fold the edges 280 to 283 over the edges 228. Body 245 is then shifted to the outer end of slot 247 to disengage plate 98d from blank 279, when the plates 201 to 204 complete their inward movement to fold the edges 280 to 283 upon the body of blank 279. Body 245 is then released and arm 97d is again lowered, whereby the plates 201 to 204 are again moved outwardly and the folded-over edges 280 to 283 are pressed between surface 74d and plate 98d to complete impregnation thereof. |
