IMPROVEMENTS IN AND RELATING TO CHANGE-SPEED GEARS FOR DRIVING FLYING SHEARS

摘要

1279796 Flying shears I UNGERER 19 April 1971 [29 Jan 1970] 20492/71 Heading B3W [Also in Division F2] A steplessly-variable-ratio drive for flying shears, cutting continuously fed material, with the ability of rapid ratio-change (under 5 seconds) without the necessity of stopping the material feed, comprises, in parallel, two steplessly variable positive gears 19, 20, controlled by individual motors 30, 31, and having a common input 1, 32-37, and outputs separately connected to a common output 24 through electromagnetic, hydraulic or pneumatic friction clutches 21, 29, so that one may be idle and preselectively adjusted, whilst the other is on load, change-over being effected, when a change in the length cut is required, by changing over the clutches 21, 29. The stepless positive gears may be of the "PIV" (Registered Trade Mark) type, with an adjustment time of 60 seconds, which would, of itself, be too long to avoid the necessity of storing material uncut during the shift interval. The stepless gears 19, 20 provide control speed for the planet-carrier 39 of a torquecombining bevel planet train, of which one sidewheel 281 drives the shears, whilst the other, 121, is driven by the motor 1 through a stepped gear 3, 17 controlled by friction clutches 8 ... 11 similar to 21, 29.