| 摘要 |
<p>1527932 Seaming non-metallic sheet material PARENA PLAST AB 26 Jan 1976 [4 Feb 1975] 02883/76 Heading B5K Apparatus for simultaneously cutting and welding two superposed film layers 12 comprises a conveyer mechanism 11 for intermittently advancing the layers 12 along a feed path through a work station; a flat bed 55 disposed at the work station below the feed path; a cutting and welding tool 31 disposed at the work station above the feed path and the bed 55 and having a movable die 44 formed to the shape to be cut and being movable into and out of contact with the layers 12; and a transfer mechanism including a suction member 45 engageable with the layers 12 at the work station to grip a piece cut from the layers 12 and movable to a delivery station 60 to deliver the gripped piece. In apparatus for making protective gloves, Fig. 1, the film layer 12, with their edges vertically aligned or slightly offset laterally, are fed from a roll 13, over a jockey roller and on to a belt conveyer 11 including an intermittently driven inner belt 15 having, throughout the upper run thereof, in non-slip engagement therewith, an outer belt 18 trained around idlers 19 one of which form part of a tensioning device. The outer surface of the belt 18 is smooth and consists of or is coated with polytetrafluoroalkylene. The belt 18 is pressed against the belt 15 by rollers 20. The layers 12 are kept spaced above the belt 18 by a metal tube 25 over which they slide and which has nozzle openings through jets of air are directed. Two cutting and welding assemblies 30, Figs. 1 and 2, are disposed one on each side of the conveyer 11 and each has four identical tools 31 on arms of a rotor 32 mounted on a shaft 33. The shafts are synchronously rotatable intermittently in 90 degree steps in synchronism with the drive of the conveyer 11. Each tool 31, Fig. 4, is connected to the rotor 32 by a support 35 provided with a vertical sleeve 37 in which slide two parallel posts 38 secured to a plate 39 urged upwardly by tension springs 40. A die plate 41, made of electrically and thermally insulating material and carried by bolts 43 is urged away from the plate 39 by compression springs 42. A shaped metal cutting and welding die strip 44 is mounted on the plate 41 and is electrically heatable. A shallow suction box 45 having suction openings 49 is urged away from the plate 41 by compression springs 46. In operation, during a rest period of the conveyer 11, the two tools 31 above the layers 12 and the bed plate 55 are depressed by cylinders 56 until the respective strips 44 and boxes 45 press the layers 12 against the belt 18 and the strips 44 effect cutting and welding. The tools 31 are retracted upwardly with the gloves held against the boxes 45. The conveyer 11 is advanced and the rotors 32 are rotated through 90 degrees and cutting and welding is repeated. Completed gloves are stacked on tables 60 and scrap film is accumulated in a container 21.</p> |
