EP0261355B1 - Apparatus for producing an even fibre tap or fibre web in a carding machine, woollen card or the like - Google Patents

Description

The invention relates to a device for homogenizing the sliver or nonwoven in a card, card or the like. With a licker, a feed roller and a dining table, wherein a sensing element is provided for the amount of fiber drawn in, which is controlled by a control device with the drive motor for the Feed roller is connected.

In a known device (FR-OS 23 22 942) there is a stationary bearing below the stationary feed roller, on which a plurality of feeler levers are movably mounted as a sensing element (dining table). The end of the feeler lever is directly adjacent to the licker-in and is spring-loaded. The other end of the feeler lever is connected to a measuring device (so-called piano lever) which detects or summarizes the displacement of the feeler lever as a function of the thickness of the fiber material drawn in. It is disadvantageous that when the fiber material is taken over from the feed roller, the workers of the licker-in (tearing forces) act on each feeler lever and can thereby falsify the measurement result. Another disadvantage is that the measuring location in the nip zone between the feed roller and the feeler lever extends over a longer area (distance from the start of the nip zone to the end of the feeler lever), in which the feed roller essentially lies opposite the feeler lever, and is therefore not clearly defined is set. In this device, the dining table consists of a plurality of spring-loaded feeler levers which are connected to a so-called piano lever mechanism, which overall is very complex in terms of construction.

The invention is therefore based on the object of providing a device of the type described at the outset which avoids the disadvantages mentioned, which in particular in a structurally simple manner avoids harmful forces on the sensing element and specifies a specific measuring location.

This object is achieved by the characterizing features of claim 1.

The dining table has at least one opening, the sensing element reaching through the opening. The fact that the dining table is present between the movable sensing element and the licker-in creates a distance between the measuring point and the licker-in. In this way, the licker is able to act on the fiber material lying on the dining table, but there is no harmful effect on the fiber material lying on the sensing element, especially not at the measuring point. Another advantage is that the measuring point in the clamping zone between the sensing element and the feed roller extends over a very short area or only over a line parallel to the axis of the feed roller or a point. In contrast to the known device, a specific measuring location is thereby clearly defined. In this way there is a constant path between the measuring point and the transfer point of the fiber material to the licker-in (point of action). Depending on whether, according to the control, more or less fiber material reaches the site of action, the picker can take over more or less fiber material. The fact that the sensing element regardless of the dining table, the construction of the device is much simpler.

Preferably the opening is a recess which can be closed on all sides or open on one side (i.e. on a short outer edge). The cutout is preferably rectangular, the long edges of the cutout running in the width direction of the dining table in relation to the working direction of the device. The sensing element is expediently rectangular, the long edges of which run in the width direction and the short edges of which run in the working direction. With this design, a measurement is carried out in a structurally simple manner at several measurement locations simultaneously over the width with a simultaneous combination (integration) of the measurement values. According to a particularly preferred embodiment, two to four sensing elements are provided, which is structurally simple and allows a combination of several measured values over wide sensing elements. The outer end of the sensing element preferably extends approximately up to the center line of the feed roller in the direction of the licker-in. The sensing element is preferably mounted on a fixed pivot bearing. Appropriately, the pivot bearing acts with a force element, for. B. counterweight, spring or the like together. The sensing element is preferably movably mounted in the vertical direction. The sensing element is preferably resiliently mounted at its two outer ends. The sensing element is expediently mounted on a holding member. The sensing element is preferably mounted rotatably about a horizontal axis. The guide element or the holding member preferably has at least one plunger core with plunger coil. The sensing element is expediently an analogue contactless distance sensor.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings.

• Fig. 1 schematisch in Seitenansicht eine Karde mit der erfindungsgemäßen Vorrichtung,
• Fig. 2 die erfindungsgemäße Vorrichtung in Seitenansicht (Fig. 2a), im Schnitt in Vorderansicht (Fig. 2b) und in Draufsicht (Fig. 2c),
• Fig. 3 perspektivische Ansicht einer Ausführungsform mit drehbar gelagertem Halteglied für das Fühlelement,
• Fig. 3a Seitenansicht gemäß Fig. 3 mit induktivern Weggeber,
• Fig. 3b Vorderansicht gemäß Fig. 3 mit zwei induktiven Weggebern,
• Fig. 4 eine Ausführungsform mit beweglich gelagerter Speisewalze,
• Fig. 5 eine Ausführungsform mit beweglich gelagertem Speisetisch,
• Fig. 6 perspektivische Ansicht einer weiteren Ausführungsform.

It shows:

• 1 schematically in side view a card with the device according to the invention,
• 2 the device according to the invention in side view (FIG. 2a), in section in front view (FIG. 2b) and in top view (FIG. 2c),
• 3 perspective view of an embodiment with a rotatably mounted holding member for the sensing element,
• 3a side view of FIG. 3 with inductive displacement sensor,
• 3b front view of FIG. 3 with two inductive displacement sensors,
• 4 shows an embodiment with a movably mounted feed roller,
• 5 shows an embodiment with a movably mounted dining table,
• Fig. 6 perspective view of another embodiment.

Fig. 1 shows a card, e.g. B. Trützschler-EXACTACARD DK 715, with feed roller 1, dining table 2, licker-in 3, drum 4, customer 5, doctor roller 6, squeeze rollers 7, 8, fleece guide element 9, pile funnel 10, take-off rollers 11, 12 and traveling cover 13. The feed roller 1 is stationary. The dining table 2 is in one piece; the rear area 2a and the front area 2b are shown. The dining table 2 has a continuous recess 19 between the areas 2a and 2b. The end of region 2b facing region 2a extends (as seen from licker-in 3) to just past the vertical center line 1a through feed roller 1. The other end of region 2b extends into the gap between feed roller 1 and licker-in 3. The other, the Area 2b facing end of area 2a extends (as seen in the direction of the licker-in 3) to just before the vertical center line 1a through the feed roller 1. The sensing element 20 is force-loaded by a pressure spring 14 which on the one hand against the underside of the feeler lever 20 and on the other hand against a stationary abutment presses.

The sensing element 20 is designed for displacement with respect to the feed roller 1 as a function of the amount of fibers 15 drawn in. The sensing element 20 is assigned a measuring element 16 for the displacement, which is connected via a control device 17 to the drive motor 18 for the feed roller 1. If a change in thickness of the amount of fiber supplied, for. B. is a thinner or thicker point, so the sensing element 20 evades accordingly. This deviation is detected by the measuring element 16 and fed to the control device 17, which sets the drive motor 18 for the feed roller 1 correspondingly faster or slower.

According to FIG. 2a, the area 2a of the dining table 2 is provided in the fiber material feeding device, via which the fiber flakes are fed in the direction of the feed roller 1. As shown in FIG. 2c, dining table 2 is formed in one piece. The dining table 2 has two openings which are designed as continuous recesses 19a, 19b (see FIG. 2c) in a rectangular shape. The long edges u ', u''andv', v '' of the recesses 19a and 19b run in the width direction of the dining table 2. The short edges x ', x''andy', y '' of the recesses 19a and 19b run in the working direction. A sensing element 20a or 20b is arranged in each case in the recesses 19a, 19b. The sensing elements 20a and 20b have a rectangular shape, the long edges running in the width direction and the short edges running in the working direction corresponding to the edges of the cutouts 19a, 19b.

According to FIG. 2a, the outer end of the sensing element 20 extends approximately to the center line 1a of the feed roller 1 in the direction of the licker-in 3.

3, the sensing element 20 is on a holding member 21, for. B. stored a beam that has a pin-shaped projection 22 at one end. A bore with a ball bearing 23 is present approximately horizontally within the sensing element 20, in which the pin 22 engages. As a result, the sensing element 20 is rotatably mounted about a horizontal axis (see arrow A). The holding member 21 is mounted on a fixed rotary bearing 23, so that the holding member 21 is rotatably mounted about a horizontal axis (see arrow B) which is perpendicular to the axis according to arrow A. By rotating according to arrow B, the sensing element 20 is movable in the vertical direction (see arrow C). The holding member 21 interacts with a compression spring 24, which is attached at one end and becomes a fixed abutment. Furthermore, a measuring element 16 is arranged on the holding member 21, for. B. from a plunger 16 'and an inductive plunger 16''(inductive, non-contact displacement transducer / distance meter). 3b, 20 measuring elements 16a and 16b are arranged in the region of the two end faces below the sensing element. A stop 21a (see FIG. 3a) prevents the sensing element 20 from engaging in the clothing of the feed roller 1.

4, the sensing element 20 is supported in the area of the two ends (longitudinal end faces) by compression springs 25a, 25b arranged below. The feed roller 1 is resilient (spring 26) and the dining table is fixed. Fig. 5 shows a bearing of the sensing element 20, wherein the feed roller 1 is fixed under the dining table 2 resilient (spring 27).

According to FIG. 6, the sensing element 20 has on its underside a support element 20a, the end surface of which is remote from the sensing element 20 and has an arcuate convex shape. This arc engages in a form-fitting manner in the arcuately concave recess of a support element 28 which runs between two vertical guides 29 (only one guide is shown in the drawing). The support element 28 is supported on its underside by two springs 31a, 31b each against a stationary abutment. In this embodiment, the sensing element 20 is rotatable about a horizontal axis according to arrow A via the support element 20a and movably supported in the vertical direction according to arrow C via the support element 28.

The direction of rotation of the rollers of the card is indicated by curved arrows. The invention was illustrated using the example of a card. It can be used in the same way for similar machines such as cards, striking machines, cleaners or similar machines.

7 shows an embodiment in which two bearings 33a, 33b are arranged on the frame walls 32a, 32b, in which the feed roller 1 is rotatably mounted. The dining table 2 is rotatably mounted in two bearings 34a, 34b via two connections 2c, 2e and 2d, 2f (see double arrow E). Furthermore, the two bearings 34a, 34b are connected by a rigid, fixed axis 36. The connections 2c, 2e are arranged rotatable about the axis 36 (double arrow E). Two pipe sections 37a, 37b are arranged rotatably about the axis 36 (see double arrow B), each of which is connected to a holding member 38a or 38b. A lever arm 39a or 39b is attached to the holding members 38a, 38b on one side, and a weight 40a or 40b is attached to each end. On the other, The lever arms 39a, 39b opposite sides of the holding members 38a, 38b each have a lever axis 21a, 21b, which extend through a recess 2g or 2h in the dining table 2. At the ends of the lever axes 21a, 21b, the sensing elements 20a, 20b are rotatably mounted about a horizontal axis (see FIG. 3, double arrow A). A measuring arm 41a, 41b, which is connected to the plunger armature 42a or 42b of the measuring element 16a or 16b, is attached to the jacket of the tube pieces 37a, 37b; each plunger 42a, 42b plunges into the associated plunger 43a or 43b. On the upper sides of the connections 2e, 2f, a support element 44a or 44b is fastened, in each of which a plate spring 45a shown in FIG. 7b and a guide pin 46a shown in FIG. 7b for the plate springs are arranged. The dining table 2 is thereby supported by the support elements 44a on the bearings 34a, 34b (cf. also FIG. 5 with support by helical springs 27).

After execution according to Fig. 7, the dining table 2 is movable. This is done in order to achieve the same possible contact pressure even with fluctuations in the thickness of the fiber material. The pressure is high and is required for clear fiber material transport and for clamping the fiber material fed at the processing edge (feed roller 2 / licker-in 3). The clamping prevents packets of fiber material from being torn out by the licker-in 3. This clamping determines the amount of pressure; The fiber material transport is less important. From the point of view of fiber transport alone, the contact pressure should be somewhat less. The pressure between the dining table 2 and the feed roller 1 is not used for measuring the fleece thickness. 7, the feed roller 1 is not movable (stationary). The sensing elements 20a, 20b (touch sensors) are movable and scan the fleece thickness against the stationary rotating feed roller 1 with very little contact pressure. This pressure does not serve to transport the fiber material, but is rather a hindrance to the transport of fiber material. Therefore, the pressure is set so weak that a clear Thickness detection is possible. An essential idea is that, in view of the mutually contradictory dimensions and tasks, the greatest possible separation of functions has been carried out. This enables the individual tasks (in particular clamping of the fiber material at the processing edge and scanning the thickness of the drawn-in fiber material to be treated independently of one another and thereby be solved) better. This leads in particular to a more sensitive detection of the thickness fluctuations. This is the opposite of what is achieved when a function is combined.

Claims (19)

1. Device for making uniform the card sliver or web in a carding machine or the like having a licker-in, a feed roller and a feed table, wherein an element for sensing the amount of fibre drawn in is provided, which sensing element is connected via a control device to the drive motor for the feed roller, characterised in that the feed table has at least one opening (19; 19a, 19b), the sensing element (20; 20a, 20b) extending through the opening (19; 19a, 19b).
2. Device according to claim 1, characterised in that the opening (19; 19a, 19b) is a cut-out.
3. Device according to claim 1 or 2, characterised in that the cut-out (19; 19a, 19b) is rectangular, the long sides (u', u''; v', v'') of the cut-out (19; 19a, 19b) extending in the width direction - relative to the working direction - of the feed table (2).
4. Device according to one of claims 1 to 3, characterised in that the sensing element (20; 20a, 20b) has the shape of a rectangle, the long sides of which extend in the width direction and the short sides of which extend in the working direction.
5. Device according to one of claims 1 to 4, characterised in that from two to four sensing elements (20; 20a, 20b) are provided.
6. Device according to one of claims 1 to 5, characterised in that the outer end of the sensing element (20; 20a, 20b) extends approximately as far as the perpendicular mid-line (1a) of the feed roller (1) in a direction towards the licker-in (3).
7. Device according to one of claims 1 to 6, characterised in that the sensing element (20; 20a, 20b) is mounted on a fixed pivot bearing (23).
8. Device according to one of claims 1 to 7, characterised in that the pivot bearing (23) acts in cooperation with a force element, for example a counter-weight, a spring (24) or the like.
9. Device according to one of claims 1 to 8, characterised in that the sensing element (20; 20a, 20b) is so mounted that it is movable in the vertical direction (arrow C).
10. Device according to one of claims 1 to 9, characterised in that the sensing element (20; 20a, 20b) is spring-mounted (25a, 25b) at both its outer ends.
11. Device according to one of claims 1 to 10, characterised in that the sensing element (20; 20a, 20b) is mounted on a mounting member (21; 22; 28).
12. Device according to one of claims 1 to 11, characterised in that the sensing element (20; 20a, 20b) is pivotally mounted about a horizontal axis (arrow A).
13. Device according to one of claims 1 to 12, characterised in that the sensing element (20; 20a, 20b) or the mounting member (21, 22;, 20a, 28) has at least one inductive measuring element (16; 16a, 16b) having a plunger (16') and a moving coil (16'').
14. Device according to one of claims 1 to 13, characterised in that the sensing element (20; 20a, 20b) is a non-contact proximity sensor that operates in analogue manner.
15. Device according to one of claims 1 to 14, characterised in that a stop (21a) is associated with the sensing element (20; 20a, 20b) or the mounting member (21, 22; 28).
16. Device according to one of claims 1 to 15, characterised in that the feed roller (1) is movably mounted and the feed table (2) is fixed.
17. Device according to one of claims 1 to 15, characterised in that the feed roller (1) is fixed and the feed table (2) is movably (arrow E) mounted.
18. Device according to claim 17, characterised in that the feed table (2) is supported in a force-loaded manner by at least one spring (27; 45a, 45b).
19. Device according to one of claims 1 to 18, characterised in that the supports of the sensing elements (20; 20a, 20b) are loaded by at least one weight (40a, 40b).

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