METHOD AND APPARATUS FOR MEASURING THE RATE OF FEE

专利名称：METHOD AND APPARATUS FOR

MEASURING THE RATE OF FEED OF FIBROUSMATERIAL

发明人：RUDSZINAT W,DT,DAVIS H,DT申请号：US27263072申请日：19720717公开号：US3825152A公开日：19740723

摘要：1397929 Feeding tobacco HAUNI-WERKE KORBER & CO KG 19 July 1972 [20 July1971 9 Nov 1971] 34043/71 Heading A2C [Also in Divisions B8 G1 and G3] The quantity oftobacco or filter fibre in a stream in a cigarette rod machine is determined by measuringthe force imparted to a rebound surface 78 against which the stream is projected atconstant speed. The measurement is used to keep the quantity per unit time constant.The force is measured by the deflection of the surface against a spring or its own weight;a signal, taken from a potentiometer 79 copuled to the surface, is compared with thatfrom a desired value potentiometer 82. As shown, any difference operates a servomotor76 which adjusts a variable speed gear 68 between a drive motor on the rod formingmachine (Fig 1, not shown) and rollers 32, 64 driving conveyors 31, 63. The fibres areswept off the latter conveyor by a constant speed brush roller 69 which projects themagainst the surface 78. If the rod forming machine is operating at, e.g., less than itsnormal speed less material is required per unit time; to prevent the system maintainingthe normal flow the speed of the rod drive is measured by a tachogenerator 92 whoseoutput is inverted at 89 to provide a compensatory signal to the control system at 87.

From the deflector plate the material falls into a duct 1 in the rod forming machine, butin Figs. 3..5 (not shown) it is brushed in by a brush roll co-operating with a corrugated ormechanically oscillated surface to ensure even distribution. The complete feed comprisesa hopper 36 from which material is taken by the belt 31 An intermediate store is formedbetween a brush roller 42 and a spiked roller 46. The level in this store is kept at aprescribed value by a system comprising a photocell 47 which controls the position of apaddle roll 52 by an electromagnet 49. The material is passed to a high speed conveyor57 by a beater roll 53, from which the heavier ribs are collected and conveyed away at 61,62, while the lighter material falls on to the conveyor 63. Alternative control systems InFig 6 (not shown) the stream of material is conveyed to the rebound surface at constantspeed, the output quantity being regulated by movement of a deflector plate inresponse to the control signal. Deflected material is taken away by a suction duct (441,Fig 7, not shown). Limit switches associated with the deflector plate are connected toAND gates, the other inputs of which receive timid pulses: their outputs pulse aservomotor which either adjusts the speed of the first conveyor (331) or (Fig 8, notshown) the speed of the spiked roller (346), thereby keeping the flow within the range ofadjustment of the deflector plate.

申请人：HAUNI WERKE KOERBER & CO KG,DT

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