APPARATUS FOR NARROWING CLAMP CHAIN IN RESIN SHEET CUTTING AND FEEDING APPARATUS OF THERMOFORMING MACHINE

摘要

PURPOSE:To transfer positively a sheet without causing the slip thereof, by providing clamp chains with movable sections and narrowing sections in conformity with the sheet width. CONSTITUTION:The resin sheet (a) is fed via a leading roll 4, a first feeding belt 5 that is run at the same speed as the extrusion speed, and a stepped section 7 to a second feeding belt 8 that is run approximately at same speed as that of the first feeding belt 5, and at the second feeding belt 8, the resin sheet (a) is allowed to be depend over the second feeding belt 8. The sheet selvages a1 are supported by an auxiliary belt 14, and then the sheet is delivered onto the sliding surfaces of clamping apparatuses by cams of the movable sections 19 of the clamp chains 18 that have been moved together with narrowing arms 23 by retraction of rods 22. When the delivering is finished, since the forward end of the cut resin sheet (a) comes below a narrowing position detecting phototube 16, it is detected thereby, and the second feeding belt is stopped. the sheet (a) can be delivered by the movable sections 19 and the narrowing sections 20 without changing the extent of the bent of the sheet.