Maschinenfabrik Rieter Ag

Rieter Machine Works, Ltd.

Peter Brutsch

Jurg Faas

Robert Demuth

Paul Staheli

Janusz Konaszweski

A throttle valve is provided within a discharge air duct located adjacent a fiber duct receiving a fiber laden air stream. The throttle valve cooperates with a stop in a lowered position to form a gap to allow a minimal air flow therethrough. In addition, a weight is provided on an arm attached to the throttle valve for pivoting therewith. The weight is disposed to counterbalance a substantial portion of the weight of the flap valve in the raised position of the valve so that the air flow maintains the valve in the open condition.

Apparatus for controlling air flow in an air duct

The dosing method and apparatus meters predeterminate quantities of fiber flocks per unit of time by means of two feed devices arranged at the lower end of a flock chute and which form therebetween a conveying gap and an opening roll is preferably arranged beneath the feed devices. The feed devices selectively comprise either:

Dosing method and apparatus for the delivery of predeterminate

A metering method or a metering apparatus for dispensing predeterminable quantities of fiber flocks per unit time by two feed rollers (18, 20; 18.1, 18.2, 170, 172) which are arranged at the lower end of a flock shaft (14, 14.1, 14.2), which are rotatable in opposite directions and which form a conveying gap between them, with an opening roll (22; 22.1, 180) preferably being arranged beneath the feed rollers, is characterized in that at least one of the feed rollers is biased in the direction of the other feed roller (18; 20.1; 170) and is movable away from the latter under the pressure of the flocks; in that the spacing (x) between the two feed rollers, or a value proportional to this distance is measured; and in that the speed of rotation of at least one of the feed rollers is so regulated that the product (n.multidot.x) of the speed and of the spacing remains constant, at least on average.

Metering method and metering apparatus for dispensing predeterminable

In order to extract fiber flocks from fiber bales conveyed on a conveyor belt by very small steps in a predetermined direction of travel, an extraction member is moved over the fiber bales in a direction substantially perpendicular to the predetermined direction of travel of the fiber bales. For this purpose, the extraction member comprises a spiked opening roller driven by a motor. This spiked opening roller conveys, by rotary motion thereof, fiber flocks from the surface of the fiber bales into a fiber-flock conveying channel, in which the fiber flocks are drawn off by a fan and delivered to a conveyor channel. In this conveyor channel, which is likewise a suction fiber-flock conveying channel, the fiber flocks are fed via a connecting line or conduit to a fiber-flock processing location. For moving the extraction member over the fiber bales, the extraction member is provided with wheel shafts and wheels having a profiled tread for guidance along tube-shaped tracks. The wheel shafts are driven by a motor and an associated gearing. A control unit synchronizes the step-by-step forward travel of the fiber bales in the aforesaid predetermined direction of travel with the travel of the extraction member over the fiber bales.

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Neuhausen, Switzerland

Peter Brutsch