FR2867489A1 - Carding machine feeder uses air that transports fibres to compress the fibre mat leaving the feeder - Google Patents

Abstract

The carding machine feeder uses the air that transports the fibres into the feeder duct (3) to increase the density of the fibre mat (4) leaving it. The fibre mat is also compressed by supplementary air, by shaking or by a system of belts and cylinders. The distribution of fibres is measured before the mat reaches the drawing roller, using ultrasound, microwaves, or sensors (11) that measure the air flow through the mat. The air passing out of the feeder duct through filters (5) is collected in separate boxes with automatically-controlled outlets (7), the boxes being at least 500 mm tall and a width of no more than 1 m.

Description

Since twenty years, we know a device to establish, for cards,

  a uniform fiber pattern which regulates the fiber distribution (DE 33115909). This arrangement provides good

  results and is used successfully in the market, but is expensive to manufacture. The object of the invention is to create an inexpensive floc feed system which regulates the distribution over the width. In known systems, the feed machine for the card is divided into an upper conduit and a lower conduit. A supply and opening device is installed between the upper duct and the lower duct. The measurement of the fiber mat is performed when the fiber mat can no longer be influenced by the machine or when crossing the draft cylinder. A prior patent application is intended to affect the fiber mat, in that the upper duct is divided into partial ducts and the fibers are detected in the partial ducts and the delivery to the ducts is influenced. partial. All these achievements are very expensive.

  This is why the present invention indicates as a card feeder machine, a simple filling machine, comprising a vertical duct measuring the column of fibers in the duct, characterized in that the transport air, which transports the fibers in the feeding machine, is also used to densify the fiber mat that leaves the feed machine and, seen over the width of the feed machine, is automatically influenced based on measurement values of the fiber distribution .

  According to another characteristic of the invention, the fiber mat is further densified by additional air, by shaking or by strips and rolls.

  According to another characteristic of the invention, the measurement values are determined before the drawing cylinder is reached.

  According to another characteristic of the invention, the measurement is carried out using ultrasound or microwaves.

  According to another characteristic of the invention, the measurement values of more than one sensor are used to influence a partition.

  According to another characteristic of the invention, the influence is achieved by throttling of the outgoing air in air collection boxes, which capture the air after it has passed through a filter wall.

  According to another characteristic of the invention, the air, which discharges out of the duct through the filtering surfaces, is captured by separate sensing boxes and that the cross section through the outlet openings of the air is controlled automatically.

  According to another characteristic of the invention, the air collection boxes have at least a height of 500 mm and have a width of no greater than 1 m.

  Other features and advantages of the present invention will emerge from the description given below, taken in reference to the accompanying drawing, in which: A fan 1, blows fibers through an injection hood by blowing 2 in a conduit 3. A mat 4 of fibers is formed in the conduit. Transport air passes through filtering surfaces 5 to enter separate collecting boxes 6 and evacuates through openings 7. The cross section of openings 7 is modified by drawers 8 which are actuated by adjusting elements 9 The adjustment elements are controlled by a central computer 10, which receives the ultrasonic barrier measurement signals 11. The fiber mat is pulled from the duct by draw cylinders 12 and is sent to a card.

Claims (8)

  1. Feeding machine for cards, characterized in that the transport air, which transports the fibers in the feed machine, is also used to densify the fiber mat (4) which leaves the feeding machine and , seen across the width of the feed machine, is automatically influenced based on measured values of the fiber distribution.   2. Feeding machine according to claim 1, characterized in that the fiber mat (4) is further densified by additional air, by shaking or by strips and rolls.   Feeding machine according to either of Claims 1 and 2, characterized in that the measured values are determined before the pulling cylinder is reached.   4. Feeding machine according to any one of claims 1 to 3, characterized in that the measurement is carried out using ultrasound or microwaves.   5. Feeding machine according to any one of claims 1 to 4, characterized in that the measurement values of more than one sensor (11) are used to influence a partition.   6. Feeding machine according to any one of claims 1 to 5, characterized in that the influence is effected by throttling the outgoing air in air collection boxes (6), which capture the air after it has passed through a filter wall (5).   7. Feeding machine according to any one of claims 1 to 6, characterized in that the air, which escapes from the duct through the filtering surfaces (5), is captured by capture boxes ( 6) and that the cross-sectional area of the openings (7) for the outlet of the air is controlled automatically.   8. Feeding machine according to claim 7, characterized in that the collectors (6) of the air have at least a height of 500 mm and have a width of no greater than 1 m.